JP5262235B2 - Midmoor gearing - Google Patents

Description

  The present invention relates to a transmission device for a mid mower, which simplifies a wheel transmission in a mid mower with a low vehicle height and a blade shaft transmission configuration of a mower deck, and allows smooth transmission.

A transmission structure in which a PTO shaft is provided in front of the front axle housing at the front of the vehicle body and the interlocking shaft is connected from the PTO shaft to the input shaft of the rear midmower deck (see, for example, Patent Document 1), or the front of the vehicle body There is known a transmission configuration (see, for example, Patent Document 2) that drives a rear wheel by providing an interlocking main transmission shaft from the engine shaft through the lower side of the step floor to the transmission case portion of the front portion of the rear axle housing. .
Japanese Patent No. 3922376 (page 4, FIG. 4). JP 2002-262635 A (page 3, FIG. 1).

  When a PTO shaft linked to the engine shaft is installed on the front side of the front axle housing and the input shaft on the mid mower deck is linked, this interlocking shaft intersects with the front axle housing, etc. And the structure of a high-floored vehicle body becomes complicated, and the elevation of the mower deck is likely to be restricted. When the main transmission shaft is linked to the transmission case of the rear axle housing part behind the engine shaft mounted on the vehicle body, and the rear wheel is linked, this transmission case part extends greatly to the front side of the rear axle housing. It is easy to limit the arrangement space of the midmoor deck to be mounted on the wheel base.

According to the first aspect of the present invention, the main transmission shaft extends from the engine shaft 3 mounted on the front portion to the rear case housing 4 on the rear axle housing 4 on the lower side of the step floor 2 of the vehicle body 1 along the front-rear direction. 6 is coupled to the belt 10 between the rear output shaft 7 depending from the rear case 5 and the input shaft 9 on the HST case 8 arranged on the rear side of the rear axle housing 4 and the main transmission shaft. 6 and the PTO shaft 11 of the bearing on the front side of the rear axle housing 4 are interlocked with the belt 12 and the input shaft 15 on the blade shaft 14 of the mid mower deck 13 is interlocked. The construction of a mid-moor transmission device.

  If comprised in this way, the rear output shaft 7 of the rear case 5 will be interlock | cooperated by the rotation of the engine shaft 3 via the main transmission shaft 6 connected to this rear end. The intermediate shaft of these main transmission shafts 6 transmits the input shaft 15 of the mock deck 13 via the belt 12, and the rear output shaft 7 transmits the input shaft 9 of the HST case 8 at the rear of the rear axle housing 4 via the belt 10. To do.

  According to a second aspect of the present invention, the rear case 5 is fitted close to a front plate 17 that forms a front wall of a collector 16 that is attached to the rear end of the vehicle body 1 and accommodates turfgrass fed from the mower deck 13. The concave portion 18 is formed. When the collector 16 is attached to the rear end portion of the vehicle body 1, a recess 18 formed in the front plate 17 of the front wall portion of the collector 16 is fitted around the rear case 5 at the rear portion of the vehicle body 1. The input shaft 9 of the HST case 8 disposed at the rear portion of the rear axle housing 4 is transmitted from the rear output shaft 7 of the rear case 5 to the belt 10. Further, turfgrass carried into the collector 16 from the mower deck 13 is supplied from a supply port formed on the side of the concave portion 18 of the front plate 17.

  According to the third aspect of the present invention, the duct 22 communicating between the discharge port 20 of the mower deck 12 and the supply port 21 of the rear collector 16 is biased to a position closer to one side with respect to the center line L of the vehicle body 1. The main transmission shaft 6 linked from the engine shaft 3 to the rear case 5 and the mower transmission shaft 19 linked from the PTO shaft 11 to the input shaft 15 on the front mower deck 13 are connected to the duct 22 side. Is arranged in a position closer to the opposite side. The driving rotation of the front engine shaft 3 is transmitted through the main transmission shaft 6 biased to one side of the center line L of the vehicle body 1, the rear output shaft 7, the belt 10, etc. at the rear end, and the HST input shaft 9. The PTO shaft 11 is transmitted from the middle portion of the main transmission shaft 6 to the belt 12. Turf grass cut by the mower deck 13 is carried into the collector 16 through the duct 22 disposed on the opposite side of the mower transmission shaft 19 and the like connected to the front side of the main transmission shaft 6 and the PTO shaft 11 from the discharge port 20. .

  According to the first aspect of the present invention, the main transmission shaft 6 is transmitted from the engine shaft 3 by crossing the upper side of the rear axle housing 4 and directly over the rear case 5, and the rear output shaft 7 and the input shaft 9 of the HST case 8 are transmitted. And between the intermediate portion of the main transmission shaft 6 and the lower PTO shaft 11 are formed to be short, and the belts 10 and 12 are transmitted so as to transmit the driving power and the cutting power. The engine shaft 3 can be lowered, the transmission structure of each part can be simplified, and the space for raising and lowering the mid mower deck 13 on the lower side of the main transmission shaft 6 can be maintained while maintaining the vehicle body structure of the bottom floor. can do.

  Further, the rear case 5 and the HST case 8 are arranged on the rear side of the rear axle housing 4 so that the wheel base on the front mower deck 13 side is kept short, and the installation space for the mid mower deck 13 is kept wide. Can do.

  According to the second aspect of the present invention, the rear case 5 and the like protrude from the rear axle housing 4 rear side of the rear portion of the vehicle body 1, but the recess 18 formed in the front plate 17 of the collector 16 to be mounted on the rear side is provided on the rear side. Thus, the collector 16 can be mounted close to the rear end of the vehicle body 1 and the overall length of the machine body can be set short.

  When the turf grass accommodated in the collector 16 is discharged, the turf grass is smoothly discharged by opening and closing the rear collector bag with respect to the front plate 17 which is formed in the recess 18 and fixed to the vehicle body 1. Therefore, the mounting configuration of the collector 16 can be simplified and stabilized.

  The invention according to claim 3 is provided with a duct 22 that is biased to one side with respect to the center line L of the vehicle body 1 and extends from the discharge port 20 of the front mower deck 13 to the supply port 21 of the rear collector 16. The main transmission shaft 6 extending from the front engine shaft 3 to the rear case 5 and the PTO shaft 11 mounted on the front side of the rear axle housing 4 and interlocking with the input shaft 15 on the blade shaft 14 are disposed. Thus, the cross-sectional area of the duct 22 is maintained to be large so that smooth turfgrass conveyance can be performed, the distance between the rear output shaft 7 of the rear case 5 and the input shaft 9 of the HST case 8, and the main transmission shaft 6. And the lower PTO shaft 11 with a short distance between the shafts, and short belts 10 and 12 are stretched between the respective shafts to form a simple interlocking structure. It is possible to perform the cutting transmission beauty.

  Based on the illustrated example, a front axle 24 having a pair of left and right front wheels 23 is swingably supported around a center pivot 25 on the lower side of the front portion of the vehicle body 1 and a pair of left and right rear wheels 26 are provided on the lower side of the rear portion. The rear axle housing 4 is suspended. By driving and rotating the engine shaft 3 of the engine 27 mounted on the front end of the vehicle body 1, the main transmission shaft 6 connected to the rear side of the engine shaft 3 is transmitted to drive the rear wheel 26 in conjunction with driving. it can. The engine shaft 3 is provided at the center in the left-right width direction at the lower part of the engine body and along the upper part of the center line L along the front-rear direction of the center part of the vehicle body 1 width. A flywheel 28 is attached to the front end portion of the engine shaft 3, a radiator 29, a radiator fan 30, etc. are disposed on the rear side of the engine 27, and the upper portion is covered with a bonnet 31, and an oil tank 32 is disposed on the rear side thereof. The steering wheel 34 is provided on the steering post 33, and the front wheel 23 is steered and linked.

  The rear axle housing 4 forms a differential case 35 in which a rear wheel differential gear mechanism is housed at a position on the left side of the tread with respect to the center line L, and an HST (hydraulic continuously variable transmission) case 8 is provided on the side of the differential case 35. The HST input shaft 9 is protruded directly upward from the case 9 so that the pulley 36, the cooling fan 37, and the like rotate integrally, and the HST control trunnion is provided on the rear side of the HST input shaft 9. A shaft mechanism 38 is disposed.

  A rear wheel 26 is mounted on both ends of the rear axle 39 in the rear axle housing 4. A connecting frame 41 connects between the left and right sides of the rear axle housing 4 and an upper end of the rear bracket 40, a fuel tank 42 for the engine 27 is mounted on the upper side of the connecting frame 41, and a seat 43 on the upper side. Is provided.

  Further, a step floor 2 is laid on the upper side of the vehicle body 1 and the main transmission shaft 6, and a seat floor 44 bent upward is connected to the rear portion of the step floor 2, and the rear end portion is connected to the connecting frame. The fender 45 is formed on both the left and right sides.

  Here, the transmission device for the mid mower to be mounted on the vehicle body 1 is located on the rear side of the vehicle body 1 from the front mounted engine shaft 3 on the rear axle housing 4 along the front and rear direction below the step floor 2 of the vehicle body 1. A main transmission shaft 6 extending over the rear case 5 is provided, and a belt 10 is engaged between the rear output shaft 7 hanging from the rear case 5 and the input shaft 9 on the HST case 8 disposed on the rear side of the rear axle housing 14. In addition, a belt 12 is coupled between the rear intermediate portion of the main transmission shaft 6 and the PTO shaft 11 of the bearing on the front side of the rear axle housing 4 so that the input shaft on the blade shaft 14 on the same side of the midmower deck 13 is coupled. 15 is a configuration of a moor gearing device that interlocks.

  The main transmission shaft 6 is composed of a transmission shaft 6a in the form of a universal joint shaft in the first half, and a latter half transmission shaft 6b directly connected thereto by spline fitting, and a pulley 53 described later is provided at the front of the latter half transmission shaft 6b. Is fixed, the rear end is extended into the rear case 5 and the bevel gear is mounted.

  Thus, the rotation of the engine shaft 3 causes the rear output shaft 7 of the rear case 5 to interlock with the rear end of the engine shaft 3 via the main transmission shaft 6 connected thereto. From the middle part of the main transmission shaft 6, the input shaft 15 of the mower deck 13 is transmitted via the belt 12, and from the rear output shaft 7 the input shaft 9 of the HST case 8 at the rear of the rear axle housing 4 is transmitted via the belt 10. .

  A recess 18 for fitting the rear case 5 close is formed on a front plate 17 that forms a front wall of a collector 16 that is attached to the rear end of the vehicle body 1 and accommodates turfgrass fed from the mower deck 13. Yes. Specifically, as shown in the figure, the rear end of the duct 22 is fitted to the right side of the L-shaped opening 17a formed in the front plate 17 to form a supply port 21, and the left side of the L-shaped opening 17a is The bulged lid 17b is detachably attached with bolts 17c, 17c, etc., and the concave portion 18 is formed in the space behind 17a by the attachment of the lid 17b. When the collector 16 is attached to the rear end portion of the vehicle body 1, the concave portion 18 formed in the front plate 17 of the front wall portion of the collector 16 is fitted around the rear case 5 at the rear portion of the vehicle body 1. The input shaft 9 of the HST case 8 disposed at the rear portion of the rear axle housing 4 is transmitted from the rear output shaft 7 of the rear case 5 to the belt 10. The turfgrass carried into the collector 16 from the mower deck 13 is supplied from a supply port (the right half of the L-shaped opening 17a) formed on the lateral side of the recess 18 of the front plate 17.

  Furthermore, a duct 22 communicating between the discharge port 20 of the mower deck 12 and the supply port 21 of the rear collector 16 is provided at a position closer to one side with respect to the center line L of the vehicle body 1, and The interlocking main transmission shaft 6 extending from the engine shaft 3 to the rear case 5 and the interlocking mower transmission shaft 19 extending from the PTO shaft 11 to the input shaft 15 on the front mower deck 13 are located at positions opposite to the duct 22 side. It is characterized by arranging. The driving rotation of the front engine shaft 3 is transmitted through the main transmission shaft 6 biased to one side of the center line L of the vehicle body 1, the rear output shaft 7, the belt 10, etc. at the rear end, and the HST input shaft 9. The PTO shaft 11 is transmitted from the middle portion of the main transmission shaft 6 to the belt 12. Specifically, a tension clutch pulley is provided on the front portion of the latter half transmission shaft 6b and the belt 12 to constitute a PTO clutch K.

  Turf grass cut by the mower deck 13 is carried into the collector 16 through the duct 22 disposed on the opposite side of the mower transmission shaft 19 and the like connected to the front side of the main transmission shaft 6 and the PTO shaft 11 from the discharge port 20. .

  The rear case 5 of the input shaft 48 that connects the rear end of the main transmission shaft 6 is attached to and supported by the connection brackets 46 and 47 that are connected to the rear bracket 40, and the middle portion of the main transmission shaft 6 is supported by the metal. 49 is attached and supported. The main transmission shaft 6 is constructed by connecting a plurality of main transmission shafts 6 to the rear end of the engine shaft 3 through universal joints, expansion shaft joints, and the like, and is disposed with a deviation from the center line L toward the left side. The rear end is connected to the input shaft 48 of the rear case 5.

  The rear case 5 is provided with an interlocking vertical rear output shaft 7 via a bevel gear, and is protruded downward to fix the pulley 50. The pulley 50 is disposed at the same height position on the rear side of the pulley 36 of the input shaft 9 of the HST, and is transmitted across the belt 10. The PTO shaft 11 is supported by a metal 51 protruding from the left end front portion of the rear axle housing 4. The belt 12 is stretched between a pulley 52 fixed to the lower PTO shaft 11 and a fixed pulley 53 to the upper main transmission shaft 6 to transmit and rotate the PTO shaft 11. The PTO shaft 11 is provided at the lower left outer side with respect to the upper main transmission shaft 6, and is disposed so as to be opposed to a substantially immediately rear portion of the input shaft 15 on the front moor deck 14.

  The mower deck 13 is a mid-mount configuration that is mounted on the abdomen of the vehicle body 1 and is biased to the left and right sides with respect to the center line L, and a pair of left and right blade shafts 14 are mounted. It has a blade 54 for cutting turfgrass. The mower deck 13 has gauge wheels 55 and 56 arranged at the front and rear lower ends, and a discharge cylinder 57 for guiding the cut grass to the discharge port 20 at the center rear is formed at the upper center. The mower deck 13 has a pair of left and right parallel front links 57 and a rear link 58 arranged on the upper part, and is suspended from the vehicle body 1 and is moved up and down while maintaining a horizontal state by a lift mechanism. . Also, blade cases 59 and 60 are provided on the upper part of the left and right blade shafts 14 on the mower deck 13, and the input shaft 15 is pivotally supported on the left blade case 59. 14 is engaged.

  The input shaft 15 can be coupled and transmitted between the rear PTO shaft 11 via a mower transmission shaft 61, a universal joint, an expansion shaft joint, and the like. A blade transmission shaft 62 extending between the blade cases 59 and 60 is provided between the left and right blade shafts 14 so as to be interlocked with each other by a bevel gear, and the left and right blade shafts 14 are configured to rotate from the front side toward the inner rear side.

  The collector 16 is attached to the rear end of the vehicle body. A mounting frame 63 detachably attached to the rear end of the vehicle body 1 is formed so as to surround the supply port 21 at the rear end of the duct 22 and the outer peripheral portion of the rear case 5 and the like. 17 is installed. Then, the supply port 21, the recess 18, and the like are formed in the front plate 17. Further, a support arm 64 is protruded from the rear upper part of the mounting frame 63, and a collector bag 66 or a collector case is attached around the support shaft 65 so as to be pivotable to the rear upper part.

  The collector bag 66 can be closed by forming a bag port 67 on the front surface and contacting the rear surface of the front plate 17 with pressure. Turfgrass discharged from the exhaust port 20 by connecting the discharge port 20 of the mower deck 13 and the supply port 21 formed on the right side of the front plate 17 with a duct 22 passing through the upper right side of the rear axle housing 4. Is guided into the collector bag 66 through the supply port 21. The collector bag 66 is formed by forming a bag frame 68 along the outer peripheral corner portion and covering the outer periphery of the bag frame 68 with a wind cloth, and closing the bag port 67 in contact with the front plate 17. Thus, the conveying wind can be discharged from the mesh portion of the net cloth to accommodate the imported turf grass. Further, the accommodating turfgrass is operated by operating a handle lever 69 protruding above the collector bag 66 and pivoting rearward and upward around the support shaft 65 to open the bag mouth 67 downward to accommodate the turfgrass accommodated. Can be dropped and discharged. A cover 70 covers the upper side of the collector bag 66.

  Since the turfgrass carried into the collector bag 66 from the supply port 21 with the collector bag 66 in the turfgrass accommodation posture position is partitioned by the concave portion 18 surface of the front plate 17, the rear case 5 portion on the front side of the concave portion 18, etc. There is no leakage contact of turf grass to prevent direct dust scattering. The concave portion 18 of the front plate 17 is configured so that the rear case 5 and the lower pulley 50 are also fitted and widely covered. Then, by fitting as deeply as possible, the collector 16 can be brought close to the vehicle body 1 and the backward protrusion of the collector 16 can be reduced. Further, the upper side surface 71 of the recess 18 in the collector bag 66 can be formed as a downwardly inclined surface so that there is no residual turfgrass during the discharging operation.

  At the bottom of the duct near the rear end supply port 21 of the duct 22, a cleaner plate 76 that rotates rearward and upward around a support shaft 75 at the rear end is provided. When the collector bag 66 is discharged, the cleaner plate 76 is attached to the handle 78. The turf grass remaining on the cleaner plate 76 at the bottom of the duct 22 is moved from the supply port 21 to the inside of the rear collector back 66 by rotating up and down through the link 79, the bell crank 80, and the like by the rotating device. It is configured to be discharged together with the turf grass of the collector bag 66 to be discharged and discharged.

  Since such a cleaner plate 76 approaches the lower rear axle housing 4 or the upper side of the transmission case portion or the like, when the cleaner plate 76 is turned upright and the bottom portion of the duct 22 is opened, the housing 4 and the like are opened. Turf grass or the like falls on the upper side, accumulates, and is held between the upper cleaner plate 76 of the closed rotation.

  In order to eliminate such turf grass on the rear axle housing 4, a scraping plate 82 that is simultaneously swung by the handle 78 is provided in a space between the upper surface of the rear axle housing 4 and the lower surface of the cleaner plate 76. Scrap the turf that accumulates by rocking back and forth. The left and right ends of the scraping plate 82 are connected from the bell crank 80 via a link rod 81 and swing back and forth.

  The collector 16 is formed by covering and attaching the bag 66 of FIG. 10 to the outer periphery of the bag frame 68 of FIG. 9, and this collector bag 66 is attached to the mounting frame 63. The bag frame 68 is made of a hollow round tube material, is formed in a box shape, and the front side surface is opposed to the front plate 17 provided on the mounting frame 63 as an open form. A left and right connecting plate 83 having a viewing window 74 formed at the front end portion is attached to the upper side surface portion of the bag frame 68, and a cutout plate 84 is attached to the rear side to cover the left side connecting plate 83. A plate 85 is attached and covered. A collector cover 70 made of a synthetic resin or the like as shown in FIG. 10 is attached to a bracket 86 having an appropriate height at the upper four corners of the cutout plate 84, etc. By forming an exhaust air gap of the interval, the exhaust air blown through the cut-out plate 84 is exhausted and guided to the rear side, the left and right lateral sides, and the like. A cover 88 that can be opened and closed by a hinge 87 is provided on the front portion of the cover 70, and the cover 88 and the lower surface holding plate 89 are rotated upward to open the view window 74. The turfgrass accommodation state can be confirmed by looking inside the collector bag 66 from 74.

  In addition, a front bottom receiving plate 92 and a rear bottom receiving plate 93 in which a sensor hole 91 for attaching the full sensor 90 is formed are disposed on the lower side of the bag frame 68. Further, hooks 94 are provided on both the left and right sides of the upper end of the bag frame 68, and the hook pins 72 of the collector cover 70 are engaged so as to be detachable. 73 is an open sensor. When the lid 88 is opened, the engine 27 is stopped by the detection of the open sensor 73.

  The collector bag 66 that covers the left and right side surfaces of the bag frame 68 from the left and right side surfaces, the bottom surface portion, and the like is provided with a mounting piece 95 and a stopper hook 96 on the peripheral portion, and the bag frame facing the mounting piece 95. Attached around 68 parts or A, hitting the opposing connecting plate 85, the cutout plate 84, and the front bottom receiving plate 42, the hook 96 is stopped and B is attached. Further, the bottom portion of the collector bag 66 is received by the rear bottom receiving plate 93 from the lower side, and is attached so as to be sandwiched between the bag frame 68, so that the weight at the time of storing the turf grass is increased. It is possible to reduce the hanging of the collector bag 66.

  Next, based on mainly FIGS. 12-14, it is set as the structure which performs load control in the said mower. The mower deck 13 is provided with a controller 97 for operating a lifting hydraulic valve with an electromagnetic solenoid, an engine rotation sensor 98 for detecting the rotation of the engine 27 on the input side, a PTO switch 99 for inserting a PTO clutch K, and switching for switching a control mode. A switch 100 or the like is provided. On the output side, an HST trunnion mechanism (servo) 38 and an electromagnetic solenoid 101 for the lifting hydraulic valve are provided.

  During the mowing operation by the mower deck 13, if the engine 27 speed falls below a predetermined speed, the weed mode A and the turf mode B can be manually selected. In the weed mode A, the hydraulic lift is operated to increase the cutting height and reduce the load. In turf mode B, the HST servo is controlled to slow down the vehicle speed and lighten the load. By controlling the load in this way, the rotational speed of the engine 27 can be maintained, and the cutting performance and the grass collection performance can be maintained. By selecting the mode, it is possible to adapt to the work environment. When finishing is required, the vehicle speed is controlled as turf mode B to ensure the uniformity of the cutting height. In roadside margins where finishing is not required, working time can be shortened as weed mode A.

  In such a mower load control configuration, an auto cruise control switch 102 is provided, and the switching between the weed mode A and the turf mode B is automatically changed based on whether or not auto cruise is used. Further, the turf mode B is controlled when the auto cruise is not used, and the weed mode A is controlled when the auto cruise is used. In this case, when the cutting height rises above a predetermined value from the initially set cutting height, the cutting height is fixed to that height, the HST servo is controlled, and load control is performed by vehicle speed control. . As described above, since the control content is automatically switched according to the work condition, the driving operation is facilitated.

Side view. The plan view. The enlarged side view of the one part. The plan view. The rear view of a rear axle housing part. Front plate perspective view The perspective view (A) of a duct bottom part, and a side view (B). The side view of a duct part. The partial perspective view of a collector part. The partial perspective view (A) of a collector part, and partial sectional drawing (B) (C). The perspective view (A) of a collector cover, and a partial side view (B). The block diagram of manual load control. The block diagram of automatic load control. The flowchart.

1 Car body 2 Step floor 3 Engine shaft 4 Rear axle housing 5 Rear case 6 Main transmission shaft 7 Rear output shaft 8 HST case 9 Input shaft 10 Belt 11 PTO shaft 12 Belt 13 Moore deck 14 Blade shaft 15 Input shaft 16 Collector 17 Front plate 18 Recess 19 Mohr transmission shaft 20 Discharge port 21 Supply port 22 Duct

Claims (3)

Main transmission across the rear case (5) on the rear side of the rear axle housing (4) from the front-mounted engine shaft (3) along the front-rear direction below the step floor (2) of the vehicle body (1) A shaft (6) is provided between the rear output shaft (7) suspended from the rear case 5 and the input shaft (9) on the HST case (8) disposed on the rear side of the rear axle housing (4). The belt (10) is interlocked and the belt (12) is interlocked between the rear intermediate portion of the main transmission shaft (6) and the PTO shaft (11) of the bearing on the front side of the rear axle housing (4). A mid-moor transmission device characterized by interlocking the input shaft (15) on the blade shaft (14) of the mid-mower deck (13).   The rear case (5) is fitted close to a front plate (17) that forms a front wall of a collector (16) that is attached to the rear end of the vehicle body (1) and accommodates turfgrass fed from the mower deck (13). The midmower transmission device according to claim 1, wherein a concave portion (18) to be combined is formed.   A duct (22) communicating between the discharge port (20) of the mower deck (13) and the supply port (21) of the rear collector (16) is connected to the center line (L) of the vehicle body (1). The main shaft (6) interlocked from the engine shaft (3) to the rear case (5) and the input shaft on the front mower deck (13) from the PTO shaft (11) 15. The mid-moor transmission device according to claim 1 or 2, wherein the interlocking mower transmission shaft (19) is arranged at a position closer to the side opposite to the duct (22).

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