CN115697041A - Combine harvester - Google Patents

Abstract

The combine can reduce the burden on the front wall of the threshing section, can support the barrel transmission case firmly, and can stably transmit the rotational power to the barrel accompanying the speed change operation. The combine harvester uses the conveying part (20) to convey the ear stalks cut by the cutter device, and supplies the ear stalks to the threshing part having the threshing cylinder (40) in the threshing chamber (7b). It is equipped with: a threshing cylinder input shaft, which is rotated by receiving power transmitted from a drive source; a threshing transmission gear, which has an intermediate shaft for changing the rotational speed transmitted from the threshing cylinder input shaft to the threshing cylinder shaft; and threshing The cylinder transmission box (80), which supports the threshing cylinder input shaft, the intermediate shaft and the extended protruding part of the threshing cylinder shaft extending from the front wall (81) of the threshing chamber (7b), the threshing cylinder transmission box (80) is composed of The front wall (81) and the conveying part (20) are supported.

Description

combine harvester

technical field

This invention relates to the combine provided with the threshing part which threshes the fringe stalk which was reaped by the reaping part and conveyed by the conveyance apparatus using a threshing cylinder.

Background technique

Conventionally, there is a combine equipped with the structure which conveys the fringe stalk cut by the cutter apparatus by a conveyance apparatus, and supplies this fringe stem to the threshing part which has a threshing cylinder. Regarding such a combine, there is a combine equipped with a threshing speed change device for changing the speed of rotation of the threshing drum rotating in accordance with, for example, the type and amount of crops to be harvested. Transmission device (for example, refer to Patent Document 1.).

The threshing speed change device is provided between the threshing cylinder input shaft which receives the transmission of power from a drive source such as an engine and rotates, and the threshing cylinder shaft which is the rotating shaft of the threshing cylinder whose axial direction is the front-back direction of the machine body. In the transmission mechanism from the barrel input shaft to the barrel shaft, the threshing speed change device changes the speed of rotation of the rotational power transmitted to the barrel shaft by changing the combination of gears that mesh with each other.

Patent Document 1 discloses a structure in which, as a threshing speed change device, a moving body formed with a gear for speed change is installed in a threshing machine whose axis is the left-right direction of the machine body so that it can move in the axial direction by spline fitting. The barrel input shaft has an intermediate shaft arranged in parallel with the barrel input shaft and meshed with the barrel shaft via a bevel gear. The threshing gear transmission transmits the rotational power of the threshing cylinder input shaft to the threshing cylinder shaft via the intermediate shaft, and performs three-stage speed change of high speed, medium speed, and low speed in response to the movement operation of the moving body. The speed change operation to the threshing speed change device is performed by the operation of the speed change lever which moves a mobile body.

About the structure disclosed by patent document 1, a threshing speed change device is installed in the front of the front wall of the threshing chamber which accommodates a threshing cylinder in a threshing part. That is, the barrel shaft extends and protrudes forward from the front wall of the threshing unit, and is configured to receive rotational power through the threshing speed change device about the protruding portion that protrudes from the front wall. And the transmission case which supports and accommodates the shaft etc. which comprise the transmission mechanism including a threshing speed change gear, is supported and fixed to the front wall of a threshing part. In addition, a shift lever is provided on the upper side of the transmission case.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2018-085942

Contents of the invention

The front wall of the threshing unit is a part that supports the heavy threshing cylinder via the threshing cylinder shaft, and is a part that receives a large load because the turning operation of the threshing cylinder is frequently switched on and off. Therefore, according to the structure which supports the transmission case by the front wall of a threshing part like the structure disclosed by patent document 1, there exists a problem that the burden of a front wall increases.

In this way, according to the conventional structure, the transmission case is supported on the front wall of the threshing section that bears the support load of the threshing cylinder, so when a sufficient supporting strength cannot be obtained at the front wall of the threshing section, the burden on the front wall becomes is too big. Too much burden on the front wall of the threshing unit may cause problems such as deformation of the front wall and inclination of the transmission case.

The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a combine that can reduce the burden on the front wall of the threshing section and can firmly support the threshing cylinder transmission case, thereby enabling stable harvesting. Transmission of rotational power to the threshing drum accompanied by speed change operation.

In the combine harvester according to the present invention, the ear stalks cut by the cutter device are transported by the conveying part, and the ear stalks are supplied to the threshing part having the threshing cylinder in the threshing chamber, and the combine harvester is characterized in that Equipped with: a threshing cylinder input shaft, which is rotated by receiving power from a driving source; a threshing transmission gear, which has an intermediate shaft for changing the rotational speed transmitted from the threshing cylinder input shaft to the threshing cylinder shaft; and a barrel transmission box supporting the barrel input shaft, the intermediate shaft, and the extended protrusion of the barrel shaft extending from the front wall of the barrel, the barrel gearbox consisting of The front wall and the conveying portion are supported.

In the said combine, the said barrel transmission case is supported by the upper surface part of the said conveyance part with respect to the said conveyance part about the combine which concerns on other aspects of this invention.

In the combine harvester according to another aspect of the present invention, the threshing cylinder transmission case has a transmission part that supports the intermediate shaft, and the transmission part has a The cylinder transmission case is supported by the support leg part of the upper surface part of the said conveyance part.

In the combine according to another aspect of the present invention, the threshing speed change device has a shift lever extending from the transmission part toward one side in the body left-right direction, and the combine The machine has: a lever supporting part provided on the conveying part and supporting the shift lever; Movement on it is restricted.

Invention effect

According to this invention, while the load of the front wall of a threshing part can be reduced, a barrel transmission case can be supported firmly, and the transmission of the rotational power to a barrel accompanying a speed change operation can be performed stably.

Description of drawings

Fig. 1 is a left side view of the combine according to the embodiment of the present invention.

It is a right side view of the combine which concerns on one Embodiment of this invention.

It is a top view of the combine which concerns on one Embodiment of this invention.

It is a figure which shows the power transmission structure of the combine which concerns on one Embodiment of this invention.

It is a perspective view which shows the structure of the barrel transmission case and its vicinity concerning one Embodiment of this invention.

It is a top view which shows the structure of the barrel transmission case and its vicinity concerning one Embodiment of this invention.

It is a left side view which shows the structure of the barrel transmission case and its vicinity which concerns on one Embodiment of this invention.

It is a right view which shows the structure of the barrel transmission case and its vicinity concerning one Embodiment of this invention.

It is a front view which shows the structure of the barrel transmission case and its vicinity concerning one Embodiment of this invention.

Fig. 10 is a plan cross-sectional view showing the structure of the barrel transmission case according to the embodiment of the present invention.

Fig. 11 is a BB sectional view of Fig. 10 .

Fig. 12 is a front cross-sectional view showing the structure of a barrel transmission case according to one embodiment of the present invention.

Fig. 13 is a DD sectional view of Fig. 12 .

FIG. 14 is a partial plan view showing the coupling structure of the shift lever according to the embodiment of the present invention.

FIG. 15 is a front view showing the structure of the rod support portion according to the embodiment of the present invention.

FIG. 16 is a partial plan cross-sectional view showing the structure of the rod support portion according to the embodiment of the present invention.

Detailed ways

The present invention intends to lighten the burden on the front wall of the threshing section and make the support of the threshing cylinder transmission box It becomes firm and realizes the stabilization of the transmission of the rotational power to the threshing cylinder accompanying the speed change operation. Embodiments of the present invention will be described below.

[The overall structure of the combine harvester]

First, the overall structure of the combine 1 which concerns on this embodiment is demonstrated using FIGS. 1-4. In addition, in the following description, let the left side (the lower side in FIG. 3) and the right side (upper side in FIG. 3) when facing the front of the combine harvester 1 be the left side and the right side of the combine harvester 1, respectively. side.

As shown in FIGS. 1 and 2 , the combine harvester 1 according to the present embodiment is an ordinary combine harvester that rakes crops harvested from a field into the body for threshing/screening/grain harvesting. Kernel storage and the ability to properly export it out of the harvester. The combine harvester 1 has the traveling body 2 which can run autonomously, and the reaping part 3 provided in the front-end|tip part of the traveling body 2. As shown in FIG. The reaping unit 3 is configured as a reaping device that takes in unreaped ear stalks such as rice and wheat while reaping them, and the reaping unit 3 is attached to the traveling body 2 so as to be able to move up and down.

The traveling body 2 is equipped with the traveling part 4 comprised as the crawler type traveling apparatus which has a pair of right and left crawler belt parts 5,5. A body frame 6 is spanned between the left and right crawler belt parts 5 , 5 . Each crawler belt part 5 has a some rotating body including the drive sprocket 5a provided in the front-end|tip part of the crawler belt part 5, and the crawler belt 5c wound around the said rotating body. The drive sprocket 5a receives the transmission of the motive power of the engine 25 with which the combine harvester 1 is equipped, and rotates and drives.

On the left side of the body frame 6 are provided a threshing unit 7 that threshs the fringe stalks harvested and supplied by the harvesting unit 3 , and a sorting unit 8 that sorts the grains threshed by the threshing unit 7 . The threshing part 7 and the screening part 8 are arrange|positioned so that the threshing part 7 may be in an upper stage, and the screening part 8 may be in a lower stage.

On the body frame 6 and on the right side of the threshing unit 7 and the screening unit 8, a grain storage unit 9 is provided. grain box 10. In the grain tank 10, the lower discharge conveyor 11 (refer FIG. 4) which conveys stored grain toward the discharge port of the grain tank 10 is provided. The vertical transfer conveyor 12 is erected in the up-down direction so as to communicate with the discharge port of the grain tank 10 . The upper end part of the vertical conveyance conveyor 12 is connected and provided with the grain discharge conveyor 13. The grain discharge conveyor 13 is provided so as to be able to turn in the horizontal direction and to be able to swing up and down around a horizontal axis. The grains in the grain tank 10 are transported by the conveyor, and discharged from the rice throwing port 14 provided at the end of the grain discharge conveyor 13 to a rack of a truck, a container, or the like.

The combine harvester 1 is equipped with the cab part 15 on which an operator gets on. The driver part 15 is provided in the front position of the grain storage part 9 on the body frame 6, that is, the position of the right front part on the body frame 6. As shown in FIG. Therefore, the driver part 15 is provided in the one side (right side) of a body left-right direction with respect to the threshing part 7. As shown in FIG.

The driving section 15 is covered by a cab 16 . The driver's seat 17, a steering wheel 18 arranged in front of the driver's seat 17, and various operating parts such as a main gear lever 19, an auxiliary gear lever, and a work clutch lever are provided in the driver's seat 15 (see FIG. 2 ). The work clutch lever is a work operation element for performing on-off operation of the threshing clutch 57 and the reaping clutch 75 (see FIG. 4 ).

An engine 25 as a driving source is provided below the cab 15 on the body frame 6 . The engine 25 is installed in the space on the front right side of the body frame 6 using the space below the cab 15 . The engine 25 is, for example, a diesel engine.

The cutting part 3 is demonstrated. The reaping unit 3 has a feeding unit 30 as a conveying device, a grain harvesting platform (platform) 31 , a cutter device 32 , a pair of left and right dividing bodies 33 , 33 and a raking and pulling wheel 34 .

The supply part 30 conveys the fringe stalk harvested by the harvesting part 3, and supplies it to the threshing part 7. The feeder part 30 has the feeder chamber 35 which is a housing|casing, and the conveyor 36 (refer FIG. 4) for fringe stalk conveyance provided in the feeder chamber 35. The feeding part 30 is located on the left side of the cab 16, and is provided in such a state that the rear end opening of the feeding chamber 35 communicates with the threshing port 7a on the front side of the threshing part 7. In this case, the long side direction is made into the approximate square cylindrical shape of the front-back direction.

The grain header 31 is configured in a horizontally long bucket shape, and is connected to the front side of the feeder 30 so as to communicate with the front end opening of the feeder chamber 35 . A raking auger (platform auger) 37 is installed in the grain header 31 . The raking auger 37 is erected via a shaft so as to be rotatable with the left-right direction as the rotation axis direction.

The cutting blade device 32 is provided in the front lower edge part of the grain header 31, and is comprised in the shape of a clipper. A pair of left and right grain dividing bodies 33 and 33 are provided so that it may protrude forward from the left and right side part of the front side of the grain harvesting stand 31. As shown in FIG. Raking together and pulling out the grain wheel 34 is a pulling out grain wheel with a pull bar, and is arranged on the position above the front of the raking auger 37 . The raking reel 34 is rotatably supported in the left-right direction as the direction of the rotation axis on one of the distal ends of a pair of left and right reel support arms 34a, 34a pivotally supported on the grain harvesting platform 31 at the base end. between. The raking and pulling wheel 3 continuously acts on the pod-forming portion of the ear stalk while rotating, thereby raking the pod-forming portion of the ear stalk toward the raking auger 37 side. The motive power of the engine 25 transmitted through various transmission mechanisms is used for the operation of each part of the harvesting part 3.

With regard to the conveyor 36 in the feeding chamber 35, as a drive shaft that is pivotally supported on its conveying terminal side, there is a reaping input shaft that is arranged on the front portion of the threshing section 7 and takes the left and right direction as the axial direction (feeding chamber conveying shaft). Shaft) 38. The rear end part of the feeder part 30 is rotatably supported by the traveling body 2 side using the reaping input shaft 38 as a rotation shaft. Moreover, the cylinder 39 for raising and lowering which is a hydraulic cylinder is interposed between the lower surface part of the supply chamber 35, and the body frame 6. As shown in FIG.

The harvesting part 3 is provided so that the feeding part 30 may rotate relative to the traveling body 2 according to the telescoping operation of the lifting cylinder 39 to perform a lifting operation. The height adjustment of the harvesting unit 3 is performed by the lifting operation of the harvesting unit 3 . The raising and lowering operation of the harvesting unit 3 is operated by a predetermined operation unit provided on the driving unit 15 .

The front rotary body 26 which sends the fringe stalk conveyed by the conveyor 36 to the threshing opening 7a is provided in the rear side of the supply part 30. As shown in FIG. The front rotary member 26 is provided between the terminal end of the conveyor 36 and the threshing port 7a. The front rotor 26 has the substantially cylindrical rotor main body 27 called a threshing drum etc., and the front rotor shaft 28 whose axial direction makes the left-right direction. The front rotor shaft 28 is disposed on the central shaft portion of the rotor body 27 and rotates integrally with the rotor body 27 . The front swing body 26 is provided in the front swing body chamber 29 (refer FIG. 7) formed above the part of the left front side of the traveling body 2. As shown in FIG.

The fringe stalks conveyed by the feeder part 30 are fed into the threshing chamber 7b of the threshing part 7 from the threshing opening 7a by the front rotary body 26 from the terminal end of the conveyor 36. The structure in which the front rotor 26 is provided in the front rotor chamber 29 together with the feeding part 30 constitutes the transport part 20 of the combine harvester 1 .

The threshing part 7 and the screening part 8 are demonstrated. The threshing part 7 has the threshing cylinder 40 provided in the threshing chamber 7b which made the threshing port 7a open to the front side, and the receiving net 42 arrange|positioned under the threshing cylinder 40. As shown in FIG. The threshing chamber 7b is formed by the frame provided on the machine body frame 6 .

The barrel 40 is rotatably supported by the barrel shaft 41 whose front-back direction is an axial direction. The threshing cylinder 40 has the cylindrical main body part which made the threshing cylinder axis|shaft 41 along the center axis|shaft, and the outer peripheral surface of a main body part is provided with the helical blade. The upper side of the threshing cylinder 40 is provided so that an angle can be adjusted, the some dust delivery valve for adjusting the conveyance speed (residence time) of the threshed material in a threshing chamber is provided. The receiving net 42 is a member which leaks a grain downward, and is provided along the outer peripheral surface of the lower part of the barrel 40. As shown in FIG.

The screening part 8 has: a swinging screening disc 43 as a swinging part, which is arranged below the receiving net 42; a swinging mechanism 44, which includes a swinging shaft 44a that swings the swinging screening disc 43 by utilizing the rotational power from the driving source; Product conveyor 45; Second-class product conveyor 46; In addition, as shown in FIG. 4 , a pre-fan 71 is provided in front of the valley lifter 47 , and a second fan 72 is provided in the rear of the valley lifter 47 .

The swing screening pan 43 has structures for specific gravity screening such as a coarse sieve arranged behind the feeder tray and a grain sieve which adjusts the amount of leakage of grains, and a grain sieve arranged under the coarse sieve. The first-grade product conveyor 45 is arranged in the first-grade product guide chute extending along the body width direction so that the first-grade product grains are collected. The second-grade product conveyor 46 is disposed in the second-grade product guide trough extending in the body width direction so that the second-grade product grains are collected at a position behind the first-grade product conveyor 45 . Grain hoisting machine 47 conveys the screening wind passing through from the front bottom to the rear top to the swing screening disc 43 .

Moreover, the reduction conveyor 48 (refer FIG. 4) is provided in the body right side of the arrange|position part of the threshing part 7 and the screening part 8. The reduction conveyor 48 is connected to the second-grade conveyor 46 so that the lower end is positioned near the second-grade conveyor 46 , and is extended so that the upper end is positioned near the front end of the threshing cylinder 40 . low slope. On the right side of the return conveyor 48, a valley conveyor 49 extending in the vertical direction is provided. The first-class product conveyed by the first-class product conveyor 45 is transported in the grain box 10 by the Yanggu conveyor 49 .

The combine harvester 1 equipped with the above structure makes the reaping part 3 rise to a desired height relative to the ground through the lifting action of the feeding part 30 centered on the reaping input shaft 38 (support shaft) in the field (as a harvesting crop The harvesting height of the fringe stalks) is changed from the non-working state to the working state, and the traveling body 2 is used to travel in this state. Thus, the combine harvester 1 uses the left and right dividing bodies 33, 33 to divide the harvested crops into harvesting objects and non-harvesting objects, and while using the raking and plucking wheels 34 to harvest the ear stalks of the harvesting object The pod portion on the fringe side of the fringe is raked while utilizing the cutter device 32 to cut the pod portion of the fringe stalk.

The pods of the fringe stalks harvested at the desired harvesting position are raked into the grain harvesting platform 31 by the rotationally driven raking auger 37, and collected at the center of the grain harvesting platform 31 in the left-right direction. Near the entrance of the supply chamber 35, the conveyor 36 in the supply chamber 35 passes through the supply chamber 35 and is fed to the threshing port 7a by the front rotating member 26, and then supplied to the threshing part 7.

The pod part of the fringe stalk supplied to the threshing part 7 is threshing-processed by the threshing part 7 . Specifically, the fringe stalks supplied to the threshing unit 7 are mainly threshed between the barrel 40 and the receiving net 42 while being transported backward by the barrel 40 that rotates. Thresholds such as grains smaller than the mesh of the receiving net 42 leak downward from the receiving net 42 . The straw chips etc. which did not fall from the receiving net 42 are discharged|emitted to a field from the dust discharge port provided in the rear part of the screening part 8 by the conveying action of the threshing cylinder 40.

On the other hand, the threshing process is performed by the threshing part 7, and the grain which leaked downward from the receiving net 42 is screened by the screening part 8. As shown in FIG. Specifically, the threshing material threshed by the threshing cylinder 40 and leaked downward from the receiving net 42 is screened into grains such as fine grains (first-class product) ), a mixture of grains such as grains with branches and straw (second-class product), and straw chips, etc., and take them out.

The grains (first-class product) dropped from the swing screening pan 43 through the screening by the screening unit 8 are sent to the grain tank by the first-grade product conveyor 45 and the grain lifting conveyor 49 connected to the first-grade product conveyor 45 . 10 delivery. Second-grade products are returned to the threshing start end side of the threshing cylinder 40 by the second-grade product conveyor 46 and the return conveyor 48 connected to the second-grade product conveyor 46, and the threshing process is performed again. Straw chips and the like are discharged to the field from the dust outlet provided at the rear of the screening unit 8 .

Next, the power transmission structure of the combine 1 which concerns on this embodiment is demonstrated using FIG. 4. FIG. The combine harvester 1 drives the reaping part 3, the traveling part 4, the threshing part 7, the sorting part 8, and the grain storage part 9 using the rotational power of the engine 25.

The engine 25 has a first output shaft 25a and a second output shaft 25b. The rotational power of the 1st output shaft 25a is transmitted to the traveling part 4, the threshing part 7, the screening part 8, and the harvesting part 3. The rotational power of the 2nd output shaft 25b is transmitted to the grain storage part 9. As shown in FIG. Moreover, the rotational power of the 2nd output shaft 25b is transmitted to the fan shaft of the cooling fan 25d provided in the engine 25. As shown in FIG. In addition, the engine 25 has a working machine pump shaft that drives the charge pump 54 that operates the elevating cylinder 39 and the like.

Regarding the power transmission system toward the travel unit 4 , the rotational power of the first output shaft 25 a is transmitted to the HST input shaft 52 by the first belt transmission mechanism 51 , and is input to a transmission 53 including a travel HST and a swing HST. Here, "HST" refers to a hydraulic continuously variable transmission device in which hydraulic pressure generated by driving a hydraulic pump is converted again into rotational force by a hydraulic motor. The drive sprocket 5a of the crawler belt part 5 which comprises the traveling part 4 is driven and rotated by the driving force of the transmission 53.

About the power transmission system toward the threshing part 7, the rotational power of the 1st output shaft 25a is transmitted to the threshing part input shaft 56 by the 2nd belt transmission mechanism 55. As shown in FIG. The threshing unit input shaft 56 is provided with the threshing clutch 57 which arbitrarily and intermittently transmits the rotational power of the 1st output shaft 25a to the 2nd belt transmission mechanism 55. As shown in FIG.

The rotational power of the threshing part input shaft 56 is transmitted to the threshing cylinder input shaft 59 by the 3rd belt drive mechanism 58 . The rotational power of the threshing cylinder input shaft 59 is transmitted to the threshing cylinder shaft 41 via the threshing cylinder transmission device 60 . The threshing speed change device 60 performs two-stage speed change of high speed/low speed with respect to the rotational power input to the barrel shaft 41 from the barrel input shaft 59 .

According to such a structure, the driving force of the engine 25 is transmitted to the threshing part 7. And the power transmission to the threshing part 7 is performed intermittently by engaging/disconnecting the threshing clutch 57 by operation of the operation clutch lever provided in the driving part 15.

Regarding the power transmission system toward the screening unit 8, the threshing unit input shaft 56 has a support shaft portion of the grain lifter 47, and the rotational power of the threshing unit input shaft 56 is transmitted to the threshing intermediate shaft 62 that is pivotally supported by the fourth belt transmission mechanism 61 The pulley rotating body 63. The rotational power of the pulley rotating body 63 is transmitted to the pre-fan 71 and the grain lifter 47 by a predetermined transmission mechanism. In addition, the rotational power of the threshing unit input shaft 56 is transmitted to the first-grade product conveyor shaft 45a that rotates the first-grade product conveyor 45, the second fan shaft 72a that rotates the second fan 72, and The second-grade conveyor shaft 46 a that rotates the second-grade conveyor 46 .

The rotational power of the first-class conveyor shaft 45a is transmitted to the valley conveyor 49 by a predetermined transmission mechanism. The rotational power of the second-grade conveyor shaft 46 a is transmitted to the swing shaft 44 a of the swing mechanism 44 by the fifth belt transmission mechanism 64 . The rotational power of the secondary product conveyor shaft 46a is transmitted to the reduction conveyor 48 via bevel gears.

Regarding the power transmission system toward the harvesting unit 3 , the rotational power of the pulley rotating body 63 is transmitted to the front rotor shaft 28 by the sixth belt transmission mechanism 73 . The 6th belt drive mechanism 73 is provided with the reaping clutch 75 which transmits the rotational power of the pulley rotating body 63 to the front rotor shaft 28 arbitrarily and intermittently. The rotational power of the front rotor shaft 28 is transmitted to the harvesting input shaft 38 by the first chain transmission mechanism 65 . The conveyor 36 in the supply chamber 35 is moved by the rotational drive of the harvesting input shaft 38 .

The rotational power of the reaping input shaft 38 is transmitted to the PF (platform) drive shaft 67 by the 2nd chain transmission mechanism 66 . The rotational power of the PF drive shaft 67 is transmitted to the PF auger shaft 37a that rotates the raking auger 37 via the third chain transmission mechanism 68 . Moreover, the rotational power of the PF drive shaft 67 is transmitted to the cutter drive shaft 32a which drives the cutter device 32 via the 7th belt transmission mechanism 69. As shown in FIG. Moreover, the rotational power of the PF drive shaft 67 is transmitted to the reel shaft 34b which rotates the raking reel 34 by the 4th chain transmission mechanism 76 which includes the reel intermediate shaft 70.

According to such a structure, the driving force of the engine 25 is transmitted to the harvesting part 3. As shown in FIG. Furthermore, power is intermittently transmitted to the reaping unit 3 by engaging/disengaging the reaping clutch 75 by operating the work clutch lever provided on the driving unit 15 .

Regarding the power transmission system toward the grain storage unit 9, the rotational power of the second output shaft 25b is transmitted to the rotary shaft 11a of the lower discharge conveyor 11 by the power transmission mechanism including the grain tank intermediate shaft 77, and the rotation of the rotary shaft 11a Power is transmitted to the rotating shaft 12a of the longitudinal transfer conveyor 12 via bevel gears. The rotational power of the rotating shaft 12a is transmitted to the rotating shaft 13a of the grain discharge conveyor 13 by a predetermined transmission mechanism. Moreover, the suction fan 78 which has suction fan shaft 78a, and the compressor 79 which has compressor shaft 79a are provided as the structure which receives the transmission of the rotational power of the grain tank intermediate shaft 77 and drives about the grain storage part 9.

As mentioned above, regarding the combine harvester 1 which concerns on this embodiment, the ear stalk harvested by the cutter device 32 of the reaping part 3 is conveyed by the conveyance part 20, and this ear stalk is supplied to the threshing chamber 7b which has The threshing part 7 of the threshing cylinder shaft 41 . And the combine harvester 1 is equipped with the threshing cylinder input shaft 59 which receives the transmission of the power from the engine 25 and rotates as the power transmission structure toward the threshing cylinder 40; The barrel input shaft 59 is the intermediate shaft 125 for changing the rotational speed transmitted to the barrel shaft 41 which is the rotating shaft of the barrel 40 ; and the barrel transmission case 80 . The power transmission structure to the barrel 40 is demonstrated using FIGS. 5-14.

As shown in FIGS. 5-14, the threshing cylinder transmission case 80 is provided in the upper front side of the front wall 81 which forms the threshing chamber 7b. The front wall 81 is a vertical plate-shaped part whose thickness direction is the front-back direction, and is located ahead of the barrel 40 . The front wall 81 has a front surface 81a that is a vertical plane. The front wall 81 supports the barrel 40 through the barrel shaft 41 together with the rear wall 82 (refer to FIG. 1, FIG. 3 ) of the barrel 7b located behind the barrel 40 .

The front wall 81 forms the threshing chamber 7b which is the rectangular space whose longitudinal direction is the front-back direction in planar view together with the rear wall 82, the left side wall surface 83, and the right side wall surface 84. Each wall of the front, rear, right and left forming the processing chamber 7b is comprised with several plate-shaped members etc.

The cylinder transmission case 80 is a case which accommodates the cylinder input shaft 59, the threshing speed change device 60, and the cylinder shaft extension protrusion 41a which is the front extension protrusion part of the cylinder shaft 41 (refer FIG. 10). The barrel transmission case 80 supports the barrel input shaft 59, the intermediate shaft 125 of the barrel transmission device 60, and the barrel shaft extension protrusion 41a. The cylinder shaft extension part 41a is the front-end part of the cylinder shaft 41, and is the extended protrusion part of the cylinder shaft 41 extended from the front wall 81 of the processing chamber 7b which accommodates the cylinder 40.

The threshing cylinder transmission case 80 has: the main transmission case part 85 which accommodates the threshing cylinder input shaft 59; The transmission part 86 includes the part which supports the intermediate shaft 125 of the threshing transmission 60. As shown in FIG. Moreover, the barrel transmission case 80 has the vertical box part 87 which accommodates the barrel shaft extension protrusion part 41a as a box part provided integrally with the gearbox part 86. As shown in FIG.

The main transmission case portion 85 is a case portion having a substantially cylindrical outer shape along a direction whose center axis is the left-right direction. The main transmission case part 85 makes the end part on the left side exist in the vicinity of the right side of the cylinder shaft extension protrusion part 41a in the left-right direction, and makes the end part on the right side substantially the same position as the right side wall surface 84. The threshing cylinder input shaft 59 is located in the center shaft part of the main transmission case part 85 .

The transmission case portion 86 is provided at a position on the right side of the main transmission case portion 85 as a diameter-enlarged portion with respect to the main transmission case portion 85 . The transmission case portion 86 is an eccentric flange-shaped case portion such that the upper side protrudes largely with respect to the main transmission case portion 85 . The transmission unit 86 has a substantially elliptical outer shape with the vertical direction as the longitudinal direction in a side view.

A substantially upper half of the transmission case portion 86 serves as an upper protrusion portion 86 a protruding upward from the main transmission case portion 85 . The transmission part 86 divides the main transmission case part 85 in the left-right direction into a left case part 85a which is a part on the left side of the transmission part 86 and constitutes most of the main transmission case part 85, and a left case part 85a which is a part of the main transmission case part 85. 86 is the right box part 85b of the part on the right side.

The vertical box portion 87 is a box portion having a substantially cylindrical outer shape with the front-rear direction as the central axis direction. The vertical box part 87 has the base part box part 87a which comprises the rear part of the vertical box part 87, and the enlarged-diameter box part 87b which comprises the front part of the vertical box part 87. As shown in FIG. The enlarged-diameter box portion 87b is an enlarged-diameter portion that is enlarged in diameter with respect to the base box portion 87a, and has an approximately semi-elliptical cylindrical shape. The cylinder shaft extension protrusion part 41a is located in the center shaft part of the vertical box part 87. As shown in FIG.

The cylinder transmission case 80 is comprised by the main transmission case part 85, the transmission case part 86, and the vertical case part 87 so that it may become substantially "L" shape in planar view. The barrel input shaft 59 mainly accommodated/supported in the main transmission case part 85 and the gearbox part 86 makes the left-right direction the axial direction. The shaft center line of the barrel input shaft 59 is located on the same horizontal plane as the shaft center line of the barrel shaft 41 that accommodates/supports the barrel shaft 41 in the longitudinal box portion 87, so that the barrel input shaft 59 is located at the same height as the threshing cylinder shaft 41 .

The barrel transmission case 80 installed in front of the threshing chamber 7b is covered with the transmission case cover 89 and the left side cover 90 which comprise the exterior of the combine harvester 1 as mentioned above (refer FIG.1, FIG.3). The transmission case cover 89 and the left side cover 90 form the accommodation space which accommodates the structure which arrange|positions the barrel transmission case 80 and the periphery together with the front wall 81 grade|etc.,.

The transmission case cover 89 is a cover which mainly covers the upper side and the front side of the barrel transmission case 80. The left side cover 90 is a cover which covers the left side of the barrel transmission case 80, the left side of the front-end part of the processing chamber 7b, etc., and is provided so that attachment and detachment are possible with one touch.

The power transmission structure to the cylinder transmission case 80 and the cylinder 40 is demonstrated in detail using FIGS. 10-13. Fig. 10 is a top sectional view at the position AA of Fig. 11 . Fig. 11 is a BB sectional view of Fig. 10 . Fig. 12 is a front sectional view at position CC of Fig. 11 . Fig. 13 is a DD sectional view of Fig. 12 .

The threshing cylinder transmission case 80 is provided as its main constituent parts: a first case member 91 forming the vertical case portion 87; a second case member 92 forming the left case portion 85a and the gearbox portion of the main transmission case portion 85 86; and the third case member 93, which forms the right side part of the gearbox part 86 and the right case part 85b of the main transmission case part 85. The said box member is a cast product, for example, and it fixes mutually with a bolt etc., and comprises the integrated barrel transmission case 80.

The left side of the second box member 92 is fixed to the front right side of the first box member 91 . On the front right side of the first box member 91, a flange portion 91a having a substantially hexagonal shape in side view is formed. A flange portion 92 a having a substantially hexagonal shape in side view is formed on the left edge portion of the second box member 92 . The first case member 91 and the second case member 92 are fixed to each other by a plurality of (ten in this embodiment) bolts 94 in a state where the end faces of the flange portions 91a, 92a are aligned with each other.

The left side of the third box member 93 is fixed to the right side of the second box member 92 . On the right side of the second case member 92, a transmission left case portion 92b constituting the left side portion of the transmission portion 86 is formed. The shift left case portion 92b is a flange-shaped portion having a substantially elliptical outer shape in side view with the vertical direction as the longitudinal direction corresponding to the outer shape of the transmission unit 86 in side view. The left side portion of the third case member 93 is a transmission right case portion 93 a constituting most of the right side of the transmission portion 86 . The shift right case portion 93a has, similarly to the shift left case portion 92b, a substantially elliptical outer shape with the vertical direction as the longitudinal direction in a side view. The second case member 92 and the third case member 93 are fixed to each other by a plurality of (nine in this embodiment) bolts 95 in a state where the end surfaces of the shift left case portion 92b and the shift right case portion 93a are aligned with each other.

As shown in FIG. 10, the threshing cylinder shaft extension protrusion part 41a is rotatably supported by the 1st case member 91 at front and back two places by the bearing 101,102. The front side bearing 101 is provided in the state fitted to the flat front wall part 91b which the 1st case member 91 has, and supports the front-end|tip part of the barrel shaft extension protrusion part 41a. The bearing 102 of a rear side is provided in the front-back direction substantially center part of the 1st case member 91, and supports the axial direction substantially center part of the barrel shaft extension protrusion part 41a. Moreover, the barrel shaft 41 is rotatably supported by the front wall 81 of the processing chamber 7b via the bearing 103 grade|etc.,.

The threshing cylinder input shaft 59 is arranged in the lower part of the gearbox part 86 and the main transmission case part 85, and is rotatably supported at four places by the bearings 105, 106, 107, 108 on the second case member 92 and the second case member 92. 3 box parts 93. The left side bearing 105 is provided in the left side end part of the 2nd case member 92, and supports the left side end part of the barrel input shaft 59. As shown in FIG.

The middle two bearings 106 and 107 are provided in the right part of the 2nd case member 92, and support the intermediate part of the barrel input shaft 59. As shown in FIG. The bearing 108 of the right side is provided in the right side part of the 3rd case member 93, and supports the right side part of the barrel input shaft 59. As shown in FIG.

The barrel input shaft 59 protrudes the right side end part from the right side of the 3rd case member 93 toward the right side and the case outside, and is set as the case outer protrusion part 59a. The barrel input pulley 110 is being fixed to the case outer protrusion part 59a of the barrel input shaft 59. As shown in FIG. The threshing cylinder input pulley 110 and the pulley 111 pivotally supported on the threshing section input shaft 56 and the belt 112 wound around the threshing cylinder input pulley 110 and the pulley 111 constitute the third belt transmission mechanism 58 (refer to FIGS. 8).

The rotational power of the barrel input shaft 59 is transmitted to the barrel shaft 41 by the 1st bevel gear 115 and the 2nd bevel gear 116 which mesh with each other. The 1st bevel gear 115 is fixedly provided in the end part of the left side of the barrel input shaft 59 located in the enlarged-diameter case part 87b of the vertical case part 87. As shown in FIG. Moreover, the barrel input shaft 59 is supported by the bearing 105 via the cylindrical part 115a which comprises the base part of the 1st bevel gear 115. As shown in FIG. The 2nd bevel gear 116 is fixedly provided in the axial direction center part of the cylinder shaft extension protrusion part 41a. Moreover, the barrel shaft extension protrusion part 41a is supported by the bearing 102 via the cylindrical part 116a which comprises the base part of the 2nd bevel gear 116. As shown in FIG.

An oil filling port 117 for supplying oil into the vertical case portion 87 is provided on the upper surface portion of the enlarged diameter case portion 87 b of the vertical case portion 87 . The oil filling port 117 is opened and closed by attaching and detaching a cover member 117b screwed to a threaded hole portion 117a formed through the upper surface portion of the diameter-enlarged case portion 87b.

In the cylinder transmission case 80, the oil passage 118 is formed in the upper and lower two places of the support part of the downstream side shaft part 122. The oil passage 118 is formed along the axial direction of the drum input shaft 59 (hereinafter referred to as "input shaft direction") so as to constitute a substantially semicircular recess in the cross-sectional view on the inner peripheral surface of the second case member 92. The linear groove part. The upper and lower oil passages 118 are provided vertically symmetrically around the position of the shaft center of the barrel input shaft 59 when viewed in the input shaft direction.

The oil passage 118 is formed over the entire left-right direction of the second case member 92 , opens to the inside of the enlarged-diameter case portion 87 b on the left side, and opens to the inside of the transmission unit 86 on the right side. According to such a structure, the oil supplied from the oil filling port 117 to the inside of the vertical case part 87 mainly uses the lower oil passage 118 to flow from the inside of the left case part 85a of the main transmission case part 85 to the inside of the transmission part 86 and the right case part 85b. Inside boot. The upper oil passage 118 mainly functions as an air passage.

In addition, a drain bolt 119 is provided at a lower portion of the transmission unit 86 . The drain bolt 119 is provided at the lower end portion of the shift left case portion 92 b of the second case member 92 so as to be detachably attached to the drain hole 92 c communicating with the inside of the transmission portion 86 . Moreover, the drain bolt 120 is similarly provided in the lower end part of the front surface part of the vertical box part 87 (refer FIG. 9).

The threshing speed change device 60 is demonstrated with reference to FIG.10, FIG.12, and FIG.14. The barrel input shaft 59 is divided into two shafts by an upstream shaft portion 121 constituting approximately half of the right side of the barrel input shaft 59 and a downstream shaft portion 122 constituting approximately half of the left side of the barrel input shaft 59 part. The upstream side shaft portion 121 and the downstream side shaft portion 122 are arranged on the same axis, and their end faces are closely opposed to each other at a position near the bearing 107 provided on the right side portion of the second case member 92 .

The upstream side shaft part 121 is a shaft part which is fixed by the barrel input pulley 110 in the case outer protrusion part 59a, and is supported by the bearing 108 in the substantially central part of an axial direction. The downstream side shaft portion 122 is a shaft portion that is fixed by the first bevel gear 115 at its left end portion and supported by the bearings 105 , 106 , and 107 .

The threshing speed change device 60 includes: the input shaft side gear arranged on the threshing cylinder input shaft 59; the intermediate shaft 125 arranged parallel to the threshing cylinder input shaft 59; gear. The threshing speed change device 60 has the 1st gear 131 and the 4th gear 134 as an input shaft side gear, and has the 2nd gear 132 and the 3rd gear 133 as a counter shaft side gear.

As shown in FIG. 12, the intermediate shaft 125 is located above the barrel input shaft 59, and is supported in the upper protrusion part 86a of the transmission part 86 so that rotation may be made into the left-right direction as an axial direction. The intermediate shaft 125 is located above the left side part of the upstream side shaft part 121 of the barrel input shaft 59 which exists in the lower part of the transmission part 86. As shown in FIG.

The intermediate shaft 125 is supported so as to be spanned between the left and right wall parts of the upper protrusion part 86a. As for the intermediate shaft 125, the right end is supported by the bearing 126 installed to fit the right side wall of the upper protrusion 86a, and the left side wall of the upper protrusion 86a is fitted by the bearing 126. The left end is supported by the bearing 127 in the closed state.

The second gear 132 is fixed to the right side of the intermediate shaft 125 , and the third gear 133 is fixed to the left side of the intermediate shaft 125 . The second gear 132 and the third gear 133 are respectively provided at positions close to the left and right side wall portions of the upper protrusion 86 a, and rotate integrally with the intermediate shaft 125 .

The first gear 131 is provided at a position corresponding to the second gear 132 on the upstream shaft portion 121 . The first gear 131 is supported by the upstream shaft portion 121 so as to be relatively rotatable with respect to the upstream shaft portion 121 , and the gear body portion is meshed with the second gear 132 .

The fourth gear 134 is fixed to the right end portion of the downstream shaft portion 122 , and is provided so as not to be relatively rotatable with respect to the downstream shaft portion 122 . The fourth gear 134 has a gear main body meshed with the third gear 133 , and has a cylindrical support cylinder 134 a on the left side of the gear main body into which the right end of the downstream side shaft 122 is inserted and fitted. The barrel input shaft 59 is supported by the bearings 106 and 107 via the support cylinder part 134a at the right end part of the downstream side shaft part 122. The downstream shaft portion 122 rotates integrally with the fourth gear 134 .

A circular opening 134 b communicating with the support cylinder 134 a is formed at the center of the gear main body of the fourth gear 134 . The upstream side shaft portion 121 has its left end portion inserted into the opening portion 134 b and is provided so as to be relatively rotatable with respect to the fourth gear 134 .

A guide ring 135 as an annular member is fixedly provided on the upstream shaft portion 121 between the first gear 131 and the fourth gear 134 . The guide ring 135 constitutes a diameter-enlarged portion of the upstream shaft portion 121 and is provided as a portion that rotates integrally with the upstream shaft portion 121 . A spline groove along the input shaft direction is formed on the outer peripheral surface of the guide ring 135 .

A locking protrusion 131c is formed on the left side of the gear body portion of the first gear 131 . The locking protrusion 131c is an annular portion having substantially the same diameter as the guide ring 135, and contacts the guide ring 135 from the right side. An outer peripheral concave-convex portion is formed on the outer peripheral portion of the locking protrusion 131c. The outer peripheral concave-convex portion forms a continuous groove with respect to the spline groove by matching with the spline groove on the outer peripheral surface of the guide ring 135 .

On the other hand, a locking protrusion 134c is formed on the right side of the gear main body portion of the fourth gear 134 . The locking protrusion 134c is an annular portion having substantially the same diameter as the guide ring 135, and contacts the guide ring 135 from the left side. An outer peripheral concave-convex portion is formed on the outer peripheral portion of the locking protrusion 134c. The outer peripheral concave-convex portion forms a continuous groove with respect to the spline groove by matching with the spline groove on the outer peripheral surface of the guide ring 135 .

A shift slider 137 as a moving body is provided outside the guide ring 135 . The shift slider 137 is an annular member, and has a concavo-convex portion spline-fitted into the spline groove of the guide ring 135 on the inner peripheral side. That is, the shift slider 137 is provided in a state of being externally fitted to the guide ring 135 so as to be relatively non-rotatable and movable in the direction of the input shaft. The shift slider 137 has substantially the same width dimension (length in the input shaft direction) as the guide ring 135 .

The shift slider 137 has enlarged diameter portions 137b on both sides in the input shaft direction, and the portion between the enlarged diameter portions 137b is a slider intermediate portion 137c (see FIG. 14 ) constituting the outer peripheral surface along the cylindrical surface. The shift slider 137 is formed with an outer peripheral groove 137a such that the enlarged diameter portions 137b on both sides and the slider intermediate portion 137c have a substantially U-shaped cross-sectional shape in a cross-sectional view passing through the central axis.

The shift slider 137 can be fitted to the engagement protrusion 131 c of the first gear 131 and the engagement protrusion 134 c of the fourth gear 134 in the same manner as the fit with the guide ring 135 . The shift slider 137 is fitted into the locking protrusion 131 c of the first gear 131 to be engaged with the first gear 131 , and is in a non-rotatable state relative to the first gear 131 . Similarly, the shift slider 137 is engaged with the fourth gear 134 by being fitted into the locking protrusion 134 c of the fourth gear 134 , and is in a non-rotatable state relative to the fourth gear 134 .

The shift slider 137 moves in the direction of the input shaft while being fitted with the guide ring 135 and engaged with the first gear 131 or the fourth gear 134 . That is, the shift slider 137 is located on the right side of its moving range, and is formed in a state where the right side portion is engaged with the locking protrusion 131 c of the first gear 131 while the left portion is engaged with the guide ring 135 . On the other hand, the shift slider 137 is located on the left side of its moving range, and is formed in a state where the left side part is engaged with the locking protrusion 134 c of the fourth gear 134 while the right part is engaged with the guide ring 135 .

In such a structure, the shift slider 137 is positioned on the right side, and transmits the rotational power of the upstream side shaft portion 121 to the first gear 131 via the guide ring 135 and the shift slider 137 . That is, the first gear 13 is in a state where it rotates integrally with the upstream side shaft portion 121 . As a result, the rotational power of the upstream shaft portion 121 is shifted from the first gear 131 to the downstream shaft portion 122 via the second gear 132 , the intermediate shaft 125 , the third gear 133 , and the fourth gear 134 . The rotational power of the downstream side shaft part 122 is transmitted to the barrel shaft extension protrusion part 41a via the 1st bevel gear 115 and the 2nd bevel gear 116. In addition, in the state where the shift slider 137 is located on the right side, the upstream side shaft portion 121 and the downstream side shaft portion 122 are formed in a state of being separated from each other.

In this way, the state in which the shift slider 137 is located on the right side and the rotational power of the upstream shaft portion 121 is shifted and transmitted to the downstream shaft portion 122 is referred to as the “first engaged state”. The first engaged state is shown in FIGS. 10 , 12 and 14 .

On the other hand, the shift slider 137 is located on the left so that the rotational power of the upstream side shaft portion 121 is transmitted to the fourth gear 134 via the guide ring 135 and the shift slider 137 . That is, the fourth gear 134 is in a state where it rotates integrally with the upstream side shaft portion 121, and the downstream side shaft portion 122 that fixedly supports the fourth gear 134 is formed in a state where it rotates integrally with the upstream side shaft portion 121 (synchronized). state of rotation). Thereby, the rotational power of the upstream side shaft part 121 is transmitted to the downstream side shaft part 122 without speeding up.

In this way, the state where the shift slider 137 is located on the left side and the rotational power of the upstream shaft portion 121 is transmitted to the downstream shaft portion 122 at a ratio of 1:1 is referred to as the “second engaged state”. In addition, in FIG. 14, the 2nd engagement state is shown by the dashed-two dotted line.

In the first engaged state, the diameter of the first gear 131 is smaller than that of the second gear 132 , thereby functioning as a pinion with respect to the second gear 132 . The diameter of the third gear 133 is smaller than the diameters of the second gear 132 and the fourth gear 134 , and thus functions as a pinion with respect to the fourth gear 134 . For example, the number of teeth of the first gear 131 and the third gear 133 is 19, and the number of teeth of the second gear 132 and the fourth gear 134 is 28.

Therefore, in the first engaged state, the rotation of the upstream side shaft portion 121 is decelerated by the first gear 131 and the second gear 132 and transmitted to the intermediate shaft 125, and the rotation of the intermediate shaft 125 is transmitted to the intermediate shaft 125 by the third gear 133 and the fourth gear. 134 to decelerate and transmit to the downstream shaft portion 122 . On the other hand, in the second engaged state, the rotation of the upstream side shaft portion 121 is transmitted to the downstream side shaft portion 122 without being decelerated, and the shaft portion integrally rotates at a constant speed.

Thus, with regard to the threshing speed change device 60 of the present embodiment, the first engaged state in which the speed change slider 137 is located on the right side is a low speed in which the rotational power input to the upstream side shaft part 121 is decelerated and transmitted to the threshing cylinder shaft extension protrusion part 41a. state. On the other hand, the second engagement state in which the shift slider 137 is located on the left side is a high-speed state in which the rotational power input to the upstream side shaft part 121 is transmitted to the threshing cylinder shaft extension protrusion part 41a without deceleration. In addition, the number of teeth of each gear which comprises the threshing speed change device 60, the reduction ratio between gears, etc. are not limited to the structure of this embodiment.

As mentioned above, the threshing speed change device 60 is comprised so that the rotational speed of the rotational power input to the barrel shaft 41 can be shifted in two stages using the movement operation of the speed change slider 137 as a speed change operation. The structure for performing the speed change operation of the threshing speed change device 60 is mentioned later.

About the power transmission structure toward the barrel 40 equipped with the above structure, the support structure of the barrel transmission case 80 is demonstrated. The threshing cylinder transmission case 80 is supported by the front wall 81 of the threshing part 7 and the conveying part 20 . In this embodiment, the barrel transmission case 80 is supported by the front wall 81 of the threshing part 7, and has the downward support part as a support part with respect to the conveyance part 20 upper surface part. That is, the threshing cylinder transmission case 80 is fixedly supported by the combine harvester 1 by the support part of two places, the rear side support part with respect to the front wall 81, and the lower side support part with respect to the conveyance part 20 upper surface part. main body side.

The rear side support part which is the 1st support part of the barrel transmission case 80 is demonstrated. The barrel transmission case 80 has the plate-shaped flange part 141 which comprises the substantially square outer shape as a rear support part in the rear end part of the vertical box part 87 in front view. The flange part 141 is provided in the rear side of the base case part 87a of the vertical case part 87, and is formed in the flange shape with respect to the base part case part 87a. The flange portion 141 has a size such that the substantially entire portion overlaps the diameter-enlarged box portion 87b in a front view, and the left upper and lower corners are exposed from the diameter-enlarged box portion 87b in a front view.

The barrel transmission case 80 is fixed to the front wall 81 by the fixing bolt 142 which penetrated the flange part 141. As shown in FIG. The fixing bolts 142 pass through holes respectively formed in the flange portion 141 and the front wall 81 from the front side, and are screwed into screw holes 143 provided on the rear surface 81 b side of the front wall 81 . The screw hole portion 143 is a fastening portion having a screw hole into which the fixing bolt 142 is screwed, and is provided by fixing, for example, a nut-shaped member to the rear surface 81b of the front wall 81 by welding or the like.

Thus, the barrel transmission case 80 is fastened and fixed to the front wall 81 by the fixing bolt 142 and the screw hole part 143 in the flange part 141. As shown in FIG. In addition, instead of the threaded hole portion 143 , fastening members such as nuts that are screwed into the fixing bolt 142 may be used.

The fixing portions by the fixing bolts 142 are provided in the flange portion 141 at the four corners of a substantially square shape that is a front view shape. That is, the flange portion 141 is fixed to the front wall 81 by four fixing bolts 142 . The front surface 81a of the front wall 81 is set as the contact surface with respect to the flange part 141 in the support part of the rear side of the barrel transmission case 80, and is set as the support surface with respect to the barrel transmission case 80.

The lower side support part which is the 2nd support part of the barrel transmission case 80 is demonstrated. The cylinder transmission case 80 has the support leg part 150 which comprises the lower support part in the lower side of the transmission part 86. As shown in FIG. The support leg 150 is a base part that forms an outer shape of the lower part of an isosceles triangle in side view.

The support leg part 150 is a part integrally formed with the transmission part 86 of the barrel transmission case 80. As shown in FIG. That is, the transmission part 86 has the support leg part 150 integrally formed with 86 A of tank main body parts, making the part where the accommodation space which accommodates the threshing speed change device 60 was formed into 86 A of tank main body parts. In this embodiment, the support leg portion 150 is provided as a part of the third case member 93 .

The supporting leg portion 150 has a right side surface 151 , a left side surface 152 , and a bottom surface 153 . The right side surface 151 and the left side surface 152 are portions formed to protrude downward from the lower portion of the box main body 86A, overlap each other in a side view, and constitute the outer shape of the support leg 150 in a side view. The bottom part 153 is a planar part that connects the lower ends of the right side part 151 and the left side part 152, has a rectangular outer shape with the front-rear direction as the long-side direction in plan view, and constitutes the bottom of the supporting leg part 150. .

The right side surface 151 is a vertical plate-shaped part. On the other hand, as shown in FIG. 13, the left side surface 152 has the front oblique part 152a, the rear oblique part 152b, and the center side part 152c. Therefore, in the left side part 152, the front side opening 152d is formed together with the lower part of the case main body part 86A of the transmission part 86 by the front bevel part 152a and the central side part 152c, and the front side opening part 152d is formed by the central side part 152c and the rear bevel part 152b. A rear opening portion 152 e is formed together with the lower portion of the case main body portion 86A of the transmission portion 86 .

An intermediate wall portion 155 is formed at the center portion in the front-rear direction of the bottom portion 153 and between the right side portion 151 and the left side portion 152 , with the front-rear direction being the plate thickness direction. In addition, a rib 156 forming a substantially triangular shape in a front view is formed between the outer surface of the right surface of the right side surface 151 and the right cylindrical portion of the third box member 93 .

The cylinder transmission case 80 is supported by the upper surface part of the conveyance part 20 with respect to the conveyance part 20 . That is, the barrel transmission case 80 is fixed to the right upper surface part 161 which comprises the upper surface part of the conveyance part 20 by the fixing bolt 160 which penetrated the bottom surface part 153 of the support leg part 150. As shown in FIG. The right upper surface portion 161 is an upper surface portion of the right support arm member 162 arranged horizontally from the right portion of the front wall 81 toward the front.

The right upper surface part 161 is a horizontal plate-shaped part, and is located below the transmission part 86 of the barrel transmission case 80. As shown in FIG. The right upper surface part 161 has the upper surface 161a which is a horizontal plane. The right upper surface portion 161 has a substantially trapezoidal shape in plan view, with the left and right outer sides (right sides) as hypotenuses and gradually narrowing in width from the rear side to the front side.

The right support arm member 162 is spanned between the right front wall forming member 163 constituting the right side portion of the front wall 81 and the right front support column 164 provided in front of the right front wall forming member 163 . The right support arm part 162 , the right front wall forming part 163 and the right front support post 164 serve as a frame part forming the front rotor chamber 29 on the right side of the front rotor 26 .

The right front wall forming member 163 is a columnar member erected on the body frame 6 , and forms the upper right portion of the front wall 81 from its upper part. The right front support column 164 is erected on the body frame 6 at a height lower than that of the right front wall forming member 163, and is located between the front rotating member 26 and the harvesting input shaft 38 in the front-rear direction. The right front support column 164 is located near the right side of the supply chamber 35 in the left-right direction.

The fixing bolt 160 for fixing the support leg 150 passes through the holes respectively formed in the bottom surface 153 and the right upper surface 161 from the upper side, and is screwed into the lower surface 161b side provided on the right upper surface 161 . The threaded hole portion 165. The screw hole portion 165 is a fastening portion having a screw hole into which the fixing bolt 160 is screwed, and is provided by fixing, for example, a nut-shaped member to the lower surface 161b of the right upper surface portion 161 by welding or the like.

In this way, the support leg portion 150 is fastened and fixed to the right upper surface portion 161 at the bottom surface portion 153 by the fixing bolt 160 and the screw hole portion 165 . In addition, instead of the threaded hole portion 165 , fastening members such as nuts that are screwed into the fixing bolt 160 may be used.

Fixing portions by fixing bolts 160 are provided at both front and rear ends of the bottom surface portion 153 . That is, the bottom surface portion 153 is fixed to the right upper surface portion 161 by two fixing bolts 160 . In the support part of the lower side of the barrel transmission case 80, the upper surface 161a of the right side upper surface part 161 is set as the contact surface with respect to the bottom surface part 153, and is set as the support surface with respect to the support leg part 150.

As mentioned above, the barrel transmission case 80 is supported by the front wall 81 of the threshing part 7 and the right upper surface part 161 which is the upper surface part of the conveyance part 20 at the front upper position of the threshing part 7. And the transmission case part 86 has the support leg part 150 which supports the barrel transmission case 80 on the right side upper surface part 161 as the part integrally formed with 86 A of box main body parts.

The structure for performing the speed change operation of the threshing speed change device 60 is demonstrated. The speed change operation of the threshing transmission gear 60 is performed by the operation of the speed change lever 170 extended and projected from the threshing cylinder transmission case 80. As shown in FIG. The threshing speed change device 60 has the speed change lever 170 extended toward one side (left side) of a body left-right direction from the transmission part 86. That is, the shift slider 137 of the threshing speed change device 60 is moved by the operation of the shift lever 170, and a 1st engagement state and a 2nd engagement state are switched. The shift lever 170 is coupled to the shift slider 137 via a shift fork 171 and a shift support shaft 172 .

The shift fork 171 is a plate-shaped member with the input shaft direction (left-right direction) as the plate thickness direction, and has a bifurcated fork body portion 171a and a fork extension protrusion 171b extending forward from the fork body portion 171a ( Refer to Figure 14). The shift fork 171 is engaged with the shift slider 137 in a state where the fork body portion 171 a is fitted into the outer peripheral groove 137 a of the shift slider 137 . As the shift fork 171 moves in the direction of the input shaft, the shift slider 137 moves in the direction of the input shaft together with the shift fork 171 .

The fork main body portion 171 a is a portion constituting a semicircular recess as viewed in the input shaft direction, with the open side being the rear side, and is fitted into the outer peripheral groove 137 a with respect to the shift slider 137 . That is, the semicircular concave portion of the fork body portion 171a matches the curved shape of the outer peripheral surface of the slider intermediate portion 137c of the shift slider 137, and the fork body portion 171a is fitted to the shift slider so as to sandwich the slider intermediate portion 137c. Block 137. The width of the outer peripheral groove 137a, that is, the distance between the left and right enlarged diameter portions 137b is slightly larger than the plate thickness of the shift fork 171, and there is a gap between the fork main body portion 171a and the enlarged diameter portion 137b. Accordingly, the shift fork 171 can move relative to the shift slider 137 in the direction of the input shaft by an amount corresponding to the gap.

The fork extending protrusion 171b has an approximately triangular shape with the front side as the top side when viewed in the input shaft direction. The shift support shaft 172 penetrates through the front end of the fork extension protrusion 171b.

The shift fork 171 is provided so as to be relatively rotatable with respect to the shift slider 137 . The shift fork 171 is provided on the shifter that rotates with the rotation of the threshing cylinder input shaft 59 so as to maintain its posture in the rotation direction (without changing its orientation) while being supported by the shifter slider 137 and the shifter support shaft 172 . Slider137.

During the rotational operation of the shift slider 137, the inner peripheral surface of the concave portion of the fork body portion 171a serves as a sliding contact surface with respect to the outer peripheral surface of the slider intermediate portion 137c. In addition, during the movement of the shift slider 137 in the direction of the input shaft according to the movement of the shift fork 171, the left and right side surfaces (plate surfaces) of the fork main body portion 171a are brought into contact with the inner surface of the enlarged diameter portion 137b. noodle.

The speed change support shaft 172 is a rod-shaped member having a circular cross-sectional shape, and is provided at a position above the barrel input shaft 59 with the input shaft direction as the axial direction. The shift support shaft 172 is fixed to the shift fork 171 by welding or the like while penetrating through the hole portion 171c formed at the front end portion of the fork extension protrusion portion 171b.

The shift support shaft 172 is provided at a predetermined position so as to be movable in the axial direction when viewed in the direction of the input shaft while being supported by the transmission unit 86 . The shift support shaft 172 is located in front of the substantially central portion in the up-down direction of the case main body portion 86A of the transmission portion 86 .

As shown in FIG. 14 , the right part of the shift support shaft 172 is inserted into a guide hole portion 175 formed in the shift right case portion 93 a constituting the case main body portion 86A. The guide hole 175 is a hole with the left side being the opening side, and has a hole diameter substantially the same as the outer diameter of the shift support shaft 172 . During the axial movement of the transmission support shaft 172 , the inner peripheral surface of the guide hole portion 175 serves as a sliding contact surface with respect to the outer peripheral surface 172 a of the transmission support shaft 172 .

The shift support shaft 172 has its left side part supported by a support hole portion 176 formed in the shift left case portion 92b constituting the case main body portion 86A. The shift support shaft 172 is supported by the support hole portion 176 so as to be movable in the axial direction via a shaft support member such as a collar 177 which is a cylindrical member.

The shift support shaft 172 fixes the shift fork 171 to a shaft portion between an insertion portion with respect to the guide hole portion 175 and a support portion with respect to the support hole portion 176 . That is, the shift fork 171 is supported with respect to the shift support shaft 172 at a position where it does not interfere with the transmission unit 86 within the axial movement range of the shift support shaft 172 .

The shift support shaft 172 has its left end protrude outside the transmission case 86 through the support hole 176 , and this protruding portion is referred to as a protruding shaft portion 172 b. The shift lever 170 is fixed to the protruding shaft portion 172b.

The shift lever 170 has: a lever body portion 181 ; and a support plate portion 182 provided at a base end portion of the lever body portion 181 . In the shift lever 170 , the support plate portion 182 is fixed to the protruding shaft portion 172 b of the shift support shaft 172 , and the lever main body portion 181 extends leftward from the support plate portion 182 . That is, the shift lever 170 extends toward the left side of the machine body from a support portion relative to the shift support shaft 172 .

The rod main body 181 has most of it except the distal end side (left side) portion as a linear portion 181 a that is a linear rod-shaped portion extending in the left-right direction. Substantially the entire rod main body portion 181 is provided as a round rod-shaped portion that constitutes a circular cross-sectional shape. The support plate part 182 is horizontally provided in the rear side of the base end part (right end part) of the linear part 181a. The support plate portion 182 is provided by fixing a plate member to the linear portion 181 a by welding or the like.

The support plate portion 182 has a substantially triangular or substantially trapezoidal outer shape in plan view, and is fixed at the rear end portion by the protruding shaft portion 172 b of the shift support shaft 172 . The support plate portion 182 is fixed to the protruding shaft portion 172b by a fixing pin 183 . The fixing pin 183 penetrates the holes respectively formed in the support plate portion 182 and the protruding shaft portion 172b from above in the vertical direction, and is fixed by a locking member 184 such as a snap ring (see FIG. 13 ).

As mentioned above, the combine harvester 1 has the shift lever 170 as the operation part of the threshing speed change device 60 , and the shift lever 170 protrudes from the transmission part 86 and is directed toward the left side which is the opposite side to the driving part 15 side in the body left-right direction. Extended settings. The lever main body portion 181 of the shift lever 170 extends and protrudes leftward from the front portion of the case main body portion 86A, passes through the front side of the left case portion 85 a of the main transmission case portion 85 and the vertical case portion 87 , and extends to the bottom of the front wall 81 . The position of the left edge.

A gripping portion 181 b is provided at a distal end portion of the rod main body portion 181 . The grip portion 181b is a portion formed by bending a rod-shaped portion downward relative to the straight portion 181a so as to form a substantially right-angled corner together with the straight portion 181a. The shift lever 170, the shift support shaft 172, the shift fork 171, and the shift slider 137 are moved integrally by holding the grip portion 181b and pushing and pulling the shift lever 170 in the left-right direction (see arrow A1 in FIG. 14 ). The operation of the threshing speed change device 60 is performed.

As shown in FIG. 14 , a ball seat mechanism 190 as a positioning mechanism is provided on the shift support shaft 172 . The ball seat mechanism 190 holds the speed change support shaft 172 at the position corresponding to each state of a 1st engagement state and a 2nd engagement state along with the speed change operation of the threshing speed change device 60. As shown in FIG. The ball seat mechanism 190 fits a ball 193 urged by a coil spring 192 into one of two outer peripheral grooves 191 formed in the shift support shaft 172 to position the shift support shaft 172 .

The outer peripheral groove 191 is a reduced-diameter portion forming a semicircular recess with respect to the outer peripheral surface 172 a of the shift support shaft 172 in a longitudinal cross-sectional view passing through the shaft center of the shift support shaft 172 . Of the two outer peripheral grooves 191, one outer peripheral groove 191a on the left is formed at a position corresponding to the position of the shift support shaft 172 in the first engaged state, and the other outer peripheral groove 191b near the end on the right is formed on the The position corresponds to the position of the shift support shaft 172 in the second engaged state.

The coil spring 192 is inserted into a support hole portion 195 formed through the shift right case portion 93 a in the front-rear direction and is a portion on the front side of the shift support shaft 172 . The coil spring 192 is provided in a state of being supported by a support bolt 196 helically inserted into the support hole portion 195 so that the direction perpendicular to the axial direction of the shift support shaft 172 (the front-rear direction in this embodiment) is the orientation of the expansion and contraction direction. .

The support hole portion 195 is formed through the boss portion 93b formed on the front wall portion of the transmission right case portion 93a in the front-rear direction so as to communicate with the guide hole portion 175 from the front side. The front side portion of the support hole portion 195 is a threaded surface, and the support bolt 196 supports the coil spring 192 on the end side portion thereof while being screwed into the support hole portion 195 .

The ball 193 is sandwiched between the coil spring 192 and the shift support shaft 172 . The ball 193 is biased toward the shift support shaft 172 by the coil spring 192 so that a part protrudes toward the inside of the guide hole 175 and fits in the outer peripheral groove 191 of the shift support shaft 172 .

With the above configuration, the ball 193 is pushed by the shift support shaft 172 against the biasing force of the coil spring 192 as the shift support shaft 172 moves due to the operation of the shift lever 170 from the state of being fitted in any one of the outer peripheral grooves 191 . Instead, it sinks into the support hole portion 195 and forms a state of being in contact with the outer peripheral surface 172 a of the transmission support shaft 172 . That is, as the shift support shaft 172 moves, the engagement of the ball 193 with the shift support shaft 172 is automatically released. Furthermore, any one of the outer peripheral grooves 191 reaches a position corresponding to the balls 193 by the movement of the shift support shaft 172, whereby the balls 193 are automatically fitted into the outer peripheral grooves 191 based on the urging force of the coil spring 192, and the shifting speed is formed. The state where the support shaft 172 is positioned.

The shift lever 170 is fixedly supported by the machine side of the combine harvester 1 in the vicinity of the grip part 181b. That is, the combine harvester 1 has the lever support part 200 provided in the conveyance part 20, and the shift lever 170 supported, and the lever fixing|fixed part 220 provided in the lever support part 200, and the shift lever 170 being fixed.

The rod support portion 200 is provided on a left upper surface portion 201 constituting the upper surface portion of the conveyance unit 20 . The left upper surface part 201 is provided in a substantially bilaterally symmetrical structure with the right upper surface part 161 supporting the transmission case part 86 . The left upper surface portion 201 is an upper surface portion of the left support arm member 202 arranged horizontally from the left side portion of the front wall 81 toward the front.

The left upper surface portion 201 is a horizontal plate-shaped portion located below the left end portion of the shift lever 170 . The left upper surface portion 201 has an upper surface 201 a that is a horizontal plane. The left upper surface portion 201 has a substantially trapezoidal shape whose width gradually narrows from the rear side toward the front side, with the left and right outer sides (left side) as hypotenuses in a plan view.

The left support arm member 202 is spanned between the left front wall forming member 203 constituting the left side portion of the front wall 81 and the left front support column 204 provided in front of the left front wall forming member 203 . The left support arm part 202 , the left front wall forming part 203 , and the left front support column 204 serve as a frame part forming the front rotor chamber 29 on the left side of the front rotor 26 .

The left front wall forming member 203 is a columnar member erected on the body frame 6 and forms the upper left portion of the front wall 81 from its upper part. The left front support column 204 is erected on the body frame 6 at a height lower than that of the left front wall forming member 203, and is located between the front rotating member 26 and the harvesting input shaft 38 in the front-rear direction. The left front support column 204 is located near the left side of the supply chamber 35 in the left-right direction.

The rod support portion 200 has: a support base portion 210 provided on the left upper surface portion 201 ; and a hook portion 218 provided on the support base portion 210 .

The support base part 210 has four surface parts: a bottom part 211 , a left side part 212 , a front part 213 , and an upper part 214 . The bottom surface portion 211 is a rectangular plate-shaped portion whose front-rear direction is the long-side direction in a plan view, and constitutes a bottom that supports the base portion 210 . The left side surface 212 is a vertical plate-shaped portion, and has a substantially trapezoidal shape in which the front side becomes vertical in a side view.

The front surface portion 213 is a vertical plate-shaped portion, and has an inverted approximately trapezoidal shape that is vertically long on the left side when viewed from the front. The upper surface portion 214 is a substantially triangular horizontal plate-shaped portion in a plan view, and is provided so as to span between the respective upper edge portions of the left side surface portion 212 and the front surface portion 213 . The support base portion 210 is constituted by, for example, a member formed by using a single steel plate with the left side surface 212 as a base and bending the other surface.

The polygonal member constituting the support base portion 210 is fixed to the left upper surface portion 201 by fixing bolts 216 penetrating the bottom surface portion 211 . Fixing bolts 216 pass through holes respectively formed in bottom surface 211 and left upper surface 201 from above, and are screwed into threaded holes 217 provided on the lower surface 201b side of left upper surface 201 . The screw hole portion 217 is a fastening portion having a screw hole into which the fixing bolt 216 is screwed, and is provided by fixing, for example, a nut-shaped member to the lower surface 201b of the left upper surface portion 201 by welding or the like.

In this way, the polygonal member constituting the support base portion 210 is fastened and fixed to the left upper surface portion 201 at the bottom surface portion 211 by the fixing bolts 216 and the screw hole portion 217 . In addition, instead of the threaded hole portion 217 , fastening members such as nuts that are screwed into the fixing bolt 216 may be used.

The fixing portions by the fixing bolts 216 are provided on the front and rear sides of the bottom surface portion 211 . That is, the bottom surface portion 211 is fixed to the left upper surface portion 201 by two fixing bolts 216 .

The hook portion 218 is a support portion that supports the lever main body portion 181 extending leftward from the lower side so as to be movable in the left-right direction while maintaining its horizontal state. The hook portion 218 is provided by fixing a rod-shaped member bent into an approximately “L” shape to the upper portion of the left side surface 212 of the support base portion 210 by welding or the like.

The hook portion 218 has one side as a horizontal axis portion 218a along the front-rear direction, and the other side as a vertical axis portion 218b along the up-down direction. With regard to the hook portion 218, the horizontal shaft portion 218a is used as a fixing portion with respect to the left side surface 212, so that the right-angled corner portion formed by the two shaft portions is positioned in front of the front surface portion 213 of the support base portion 210. position, and make the vertical axis portion 218b stand upward from the front end portion of the horizontal axis portion 218a. The rod main body portion 181 is located between the front surface portion 213 and the longitudinal shaft portion 218b.

According to the rod supporting part 200 structured as above, the rod main body part 181 is supported from the lower side by the horizontal shaft part 218a of the hook part 218, and is supported so that the forward and backward movement is restricted and the left and right directions are allowed by the front surface part 213 and the vertical shaft part 218b. the state of the move. In addition, the shape of the hook part 218 is not limited to this embodiment, For example, it may be a ring-shaped part etc. in side view. That is, as the hook portion 218 , it is only necessary to allow the lateral movement of the rod main body portion 181 and to restrict the forward and backward movement of the rod main body portion 181 together with the support base portion 210 .

As shown in FIGS. 15 and 16 , the lever fixing portion 220 is provided on the lever support portion 200 and functions as a lever movement restricting portion that restricts movement of the shift lever 170 in at least the left-right direction that is the shift operation direction. In the present embodiment, the lever fixing portion 220 is a portion that fixes the lever body portion 181 to the front surface portion 213 of the support base portion 210 .

The rod fixing part 220 fixes the rod main body part 181 to the front surface part 213 of the support base part 210 by the rod fixing member 230 . The rod fixing member 230 is a so-called bolt with a handle, and has a handle portion 230a having a plurality of concave portions on the outer peripheral portion, and a shaft-shaped bolt portion 230b formed with an external thread portion.

In the rod fixing member 230, the bolt part 230b passes through the locking hole 181c formed in the rod main body part 181 and the hole part 213a formed in the front surface part 213 from the front side, and is screwed into the hole provided on the back side of the front surface part 213. The threaded hole portion 231 . The screw hole portion 231 is a fastening portion having a screw hole into which the bolt portion 230b is screwed, and is provided by fixing a nut-shaped member to the back surface of the front surface portion 213 by welding or the like, for example.

In the rod main body portion 181 , the locking hole 181 c is formed at a plate-shaped portion 181 d whose thickness direction is the front-rear direction. The plate-like portion 181d has a plate thickness dimension smaller than the outer diameter of the round bar-shaped portion of the linear portion 181a, and a dimension in the vertical direction larger than the outer diameter. The plate-shaped portion 181d constitutes a flat portion protruding up and down relative to the shaft-shaped portion in the linear portion 181a.

The rod fixing part 220 is tightened by rotating the rod fixing member 230 so that the plate-shaped part 181d is sandwiched between the handle part 230a of the rod fixing member 230 and the front surface part 213 of the support base part 210. In this state, the rod main body 181 is supported and fixed. The lever fixing member 230 is attached to and detached from the lever main body 181 and the support base 210 by manually rotating the handle 230 a as a grip.

A hole 213 a and a threaded hole 231 serving as attachment portions of the rod fixing member 230 are provided at two locations on the front surface portion 213 of the support base portion 210 at predetermined intervals in the left-right direction. The hole 213a and the threaded hole 231 on the right side are mounting parts corresponding to the first engagement state (low speed state) of the threshing speed changer 60, and the hole 213a and the threaded hole 231 on the left side are the mounting parts corresponding to the threshing speed changer 60. Mounting part corresponding to the second engaged state (high-speed state). In addition, in this embodiment, as the mounting part of the rod fixing member 230, two mounting parts for low speed and high speed are provided on the support base part 210 side. The mounting portion on the base portion 210 side is provided at one location, and two locking holes 181 c for low speed and high speed are formed on the rod main body 181 side.

About the said structure, when performing the speed change of the threshing transmission gear 60, first, the left side cover 90 which covers the left side of the threshing cylinder transmission case 80 is removed, and the rod fixing part 220 is made into the state which can handle. And, in the shifting of the threshing speed change device 60, in the state after the rod fixing member 230 is removed, the shift lever 170 is moved in the left-right direction while holding the grip part 181b, thereby performing the first engagement state and the second engagement state. 2 Switching of the engaged state.

Here, when changing from the first engaged state to the second engaged state, that is, when switching from the low speed state to the high speed state, the shift lever 170 is pulled leftward as a shift operation. On the other hand, when changing from the second engaged state to the first engaged state, that is, when switching from the high-speed state to the low-speed state, the operation of pushing the shift lever 170 to the right is performed as a shift operation. .

After switching between the first engagement state and the second engagement state, the fastening lever fixing member 230 is attached, and the lever main body portion 181 of the shift lever 170 is supported and fixed to the left part of the body. In addition, the shift support shaft 172 that integrally moves the shift lever 170 receives a positioning action by the ball seat mechanism 190 in each state of the first engaged state and the second engaged state. The operator can use the ball seat mechanism 190 to obtain the shift lever 170 at a position corresponding to each engagement state to be switched as an operational feeling accompanying the engagement of the ball 193 with the shift support shaft 172 .

The speed change operation of the above threshing speed change device 6 is performed, for example, at the time of stop of the engine 25, etc., in the state which the threshing cylinder input shaft 59 stopped rotating. The switching of the rotation speed of the barrel 40 by the threshing speed change device 60 is performed according to the kind, quantity, etc. of the harvested crops, for example, so that efficient threshing process of the threshing part 7 is performed. For example, the high-speed state in which the threshing cylinder 40 rotates at a relatively high speed is used for harvesting rice and wheat, and the low-speed state in which the threshing cylinder 40 rotates at a relatively low speed is used for harvesting soybeans.

According to the combine harvester 1 which concerns on this embodiment equipped with the said structure, the load of the front wall 81 of the threshing part 7 can be lightened, and the threshing cylinder transmission case 80 can be firmly supported, and the operation|movement accompanying a speed change operation can be performed stably. Transmission of rotational power to the drum 40 .

In the combine harvester 1 of this embodiment, the threshing cylinder transmission case 80 is formed in the structure which has the main transmission case part 85 and the transmission case part 86, and is provided with the rear side support part using the front wall 81 with respect to the threshing chamber 7b. , The structure which supports the barrel transmission case 80 with respect to the lower support part of the upper surface part of the conveyance part 20. That is, the barrel transmission case 80 is supported by two surfaces of the vertical surface based on the front wall 81 and the horizontal surface based on the conveyance part 20 upper surface part.

According to such a structure, since the support load of the barrel transmission case 80 can be shared by several support parts, the load which acts on the front wall 81 of the barrel 7b can be reduced. In particular, since the barrel transmission case 80 includes the gearbox portion 86 for accommodating the threshing transmission device 60 , it is relatively large and heavy compared to the structure of the barrel transmission case without the threshing transmission device 60 . Therefore, according to the support structure of the barrel transmission case 80 which concerns on this embodiment, the burden of the front wall 81 of the barrel 7b can be reduced effectively.

Thereby, for example, deformation of the front wall 81 and inclination of the barrel transmission case 80 can be suppressed, and the transmission of the rotational power to the barrel 40 by the power transmission mechanism provided in the barrel transmission case 80 can be performed stably. , and the speed change of the threshing cylinder 40 by the threshing speed change device 60 can be reliably performed. In particular, when the input to the threshing cylinder 40 is switched on and off, the load on the front wall 81 increases due to vibration of the threshing cylinder transmission case 80 and the like. The supporting structure of the threshing cylinder transmission case 80 can also support the threshing cylinder transmission case 80 firmly and stably.

Moreover, the transmission case part 86 has the support leg part 150 integrally formed with 86 A of tank main body parts, and the tank main body part 80 about the barrel transmission case 80 which concerns on this embodiment.

According to such a structure, since a part of the barrel transmission case 80 can be used as a lower support part, the support structure of the barrel transmission case 80 can be made into a simple structure. Thereby, when installing the lower support part of the barrel transmission case 80, it can avoid causing the increase of the number of parts and the increase of an assembly man-hour.

Moreover, the combine harvester 1 which concerns on this embodiment has the shift lever 170 extended and protruded from the transmission part 86, and extended toward the left side which is the opposite side of the driving part 15 side as the operation part of the threshing speed change device 60. , and has: a rod support part 200 provided on the upper surface part of the conveying part 20; and a rod fixing part 220 provided on the rod support part 200.

According to such a structure, the operability with respect to the speed change operation of the barrel 40 can be improved. That is, the speed change operation of the threshing cylinder 40 can be performed by a simple operation such as a push-pull operation of the speed change lever 170 from a position away from the transmission part 86 such as the machine side (left side) of the combine harvester 1. Get good operability. In addition, since the shift lever 170 can be operated by detaching the left side cover 90 which is detachable with one touch, the shift operation can be easily performed.

In addition, by connecting the shift lever 170 to the shift slider 137 of the threshing speed change device 60 through the shift fork 171 and the shift support shaft 172, and manually operating the shift lever 170, it is possible to implement the shift lever 170 with a cheap and simple structure. A structure for changing the speed of the threshing cylinder 40 . Moreover, since the cylinder transmission case 80 can be supported firmly and stably, stable operation feeling can be acquired with respect to the push-pull operation of the shift lever 170 extended from the cylinder transmission case 80.

Moreover, the upstream side shaft part 121 to which the barrel input pulley 110 was attached, and the downstream side shaft part 122 to which the 2nd bevel gear 116 was attached are coaxially arrange|positioned about the threshing speed change device 60 which concerns on this embodiment. That is, the input shaft part and the output shaft part of the threshing speed change device 60 are coaxially arrange|positioned.

According to such a structure, the position of an input shaft part and the position of an output shaft part can be made common in the structure provided with the threshing speed change device 60 like this embodiment, and the structure which does not provide the threshing speed change device 60. Thereby, the barrel transmission case 80 which concerns on this embodiment can be applied without changing the position of the barrel input pulley 110, the 2nd bevel gear 116, etc. with respect to the existing structure which does not provide the threshing speed change device 60, for example.

Moreover, about the barrel transmission case 80 which concerns on this embodiment, the intermediate shaft 125 which comprises the barrel input shaft 59 which comprises the barrel input shaft 59 is provided in the upper position, and the transmission part 86 is provided so that the up-down direction may become a long side. The lengthwise box part of the direction.

According to such a structure, the barrel transmission case 80 can be comprised compactly in the front-back direction. Thereby, interference of the barrel transmission case 80 and the transmission case cover 89 can be avoided easily. Moreover, the stress which acts on the support part of the barrel transmission case 80, especially a lower support part can be reduced compared with the structure etc. which arrange|positioned the intermediate shaft 125 ahead of the barrel input shaft 59, for example. Therefore, the lower support part of the barrel transmission case 80 can be made compact.

Moreover, according to the structure which has a lower support part as a support part of the barrel transmission case 80, the tension|tensile_strength which the barrel transmission box 80 receives from the belt 112 via the barrel input pulley 110 with respect to the barrel input shaft 59 can be ensured easily. Support strength.

That is, as shown in FIG. 8 , the pulley 111 that receives the winding of the belt 112 together with the barrel input pulley 110 is located behind and below the barrel input pulley 110 , and acts on the barrel input pulley 110 as a belt. The tension of 112 is mainly the tension of the bottom. The tension acting on the lower side of the barrel input pulley 110 in this way is supported by the lower support part of the barrel transmission case 80 based on the support leg part 150 via the barrel input shaft 59 . That is, the support leg part 150 is formed in the form which protrudes and supports the right side upper surface part 161 with respect to the tensile force which acts on the lower side of the barrel input pulley 110 by the belt 112. As shown in FIG.

Thereby, since the downward tension which the belt 112 applies to the barrel input pulley 110 can be received by the lower support part which supports the barrel transmission case 80 from the lower side, the barrel transmission box 80 can be supported effectively. Moreover, the tension pulley 113 which contacts from the outer peripheral side of the belt 112 is provided in the lower rear of the barrel input pulley 110.

Thus, according to the support structure of the cylinder transmission case 80 which concerns on this embodiment, based on the relationship with the arrangement|positioning structure of the pulley 111 with respect to the cylinder input pulley 110, from the viewpoint of the support strength of the tension|tensile_strength applied to the belt 112 See, it is also possible to stably support the threshing cylinder transmission case 80 .

As mentioned above, the combine which concerns on this invention demonstrated using embodiment is not limited to said embodiment, Various forms can be employ|adopted in the range corresponding to the summary of this invention.

In the above-mentioned embodiment, the front rotating member 26 is provided at the rear of the feeding part 30, but the conveying part 20 may be, for example, a structure in which the ear stalks are fed into the threshing port 7a by using the conveyor 36 of the feeding part 30. Structure with front swivels.

In the above-mentioned embodiment, the threshing speed change device 60 is configured to decelerate and transmit the rotational power transmitted via the intermediate shaft 125 , but may be configured to increase the rotational power transmitted via the intermediate shaft 125 . transfer.

In the above embodiment, the threshing cylinder transmission case 80 is supported by the support leg 150 on the right upper surface part 161 of the right support arm member 162 which is one of the frame members forming the front rotor chamber 29 with respect to the conveyance part 20 , however, is not limited to such a structure. That is, the support position of the barrel transmission case 80 with respect to the conveyance part 20 may be the middle part between the right upper surface part 161 and the left upper surface part 201 in the upper surface part of the front rotor chamber 29, for example.

Explanation of reference signs

1 combine harvester

2 traveling body

3 Harvesting Department

7 Threshing department

7b Threshing room

15 Driver

20 Conveying Department

25 engine (drive source)

30 Feeding Department

26 front pivot

29 Front Rotary Chamber

32 Cutter unit

40 Thresher

41 Thresher shaft

41a Thresher Shaft Extension Tab

59 Thresher input shaft

60 threshing speed change device

80 threshing cylinder transmission box

81 front wall

85 Main transmission box

86 Transmission Department

86A box body

125 intermediate shaft

141 Flange

150 support feet

161 Right upper surface part (upper surface part)

162 Right support arm part

170 Gear lever

200 rod support

201 left upper surface

210 Support base part

220 Rod fixing part (rod movement restricting part)

230 rod fixing parts

Claims (4)

1. A combine harvester which conveys ear stalks cut by a cutter device by a conveying section and supplies the ear stalks to a threshing section having a threshing cylinder in a threshing chamber,

it is characterized in that the preparation method is characterized in that,

the combine harvester is provided with:

a threshing cylinder input shaft that receives power from a drive source and rotates;

a threshing speed change device having an intermediate shaft for changing a rotational speed transmitted from the input shaft of the threshing cylinder to a threshing cylinder shaft; and

a threshing cylinder transmission case that supports the threshing cylinder input shaft, the intermediate shaft, and an extension projection portion of the threshing cylinder shaft that extends and projects from a front wall of the threshing chamber,

the threshing cylinder gearbox is supported by the front wall and the conveying part.

2. A combine harvester according to claim 1,

the threshing cylinder transmission case is supported on the upper surface portion of the conveying portion relative to the conveying portion.

3. A combine harvester according to claim 1 or 2,

the threshing cylinder transmission case has a transmission case part for supporting the intermediate shaft,

the transmission case section has a support leg section for supporting the threshing cylinder transmission case on the upper surface section of the conveying section.

4. A combine harvester according to claim 3,

the threshing speed-changing device is provided with a gear lever extending from the gear box part to one side of the left and right directions of the machine body,

the combine harvester is provided with: a lever support portion that is provided in the conveying portion and supports the shift lever; and a lever movement restricting portion that is provided on the lever support portion and that restricts movement of the shift lever in at least a shift operation direction.

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