CN111698900A - Combine harvester - Google Patents

Abstract

A combine harvester is provided with: a longitudinal conveying device (31) which is arranged at the lateral side part of the threshing device (13) on the grain storage part (15) side and conveys the threshed grains upwards towards the grain storage box (15); and a clutch switching device (70) that switches the operating states of the plurality of operating devices at appropriate timings. The clutch switching device (70) is arranged between the threshing device (13) and the grain storage part (15) and is closer to the rear side than the longitudinal conveying device (31).

Description

Combine harvester

Technical Field

The invention relates to a combine harvester.

Background

[1]

Conventionally, as a combine harvester, for example, a combine harvester described in patent document 1 is known. Patent document 1 discloses a combine harvester including: a harvesting part (a 'harvesting conveying device (3)' in the literature) for harvesting the planted vertical grain stalks; a threshing device (4) in the literature) for threshing the harvested rice straw; a grain storage section (in the literature, "grain storage device [ 5 ]) which is provided in parallel with the threshing device in the transverse direction and stores the threshed grains; and an operating state switching device (in the literature, "clutch operating device [ a ]) for switching the operating states of the plurality of operating devices at appropriate timings.

[2]

Conventionally, as a combine harvester, for example, a combine harvester described in patent document 2 is known. Patent document 2 discloses a combine harvester including: a driver section (in the document, "driver section [ 18 ]) having a driver seat (in the document," driver seat [ 30 ]) and a side panel (in the document, "operation unit [ U ]) provided on one side in the left-right direction of the machine body with respect to the driver seat; an engine room (in the literature, "engine room [ R ]), which is provided below the cab and which houses an engine (in the literature," engine [ E ]) and an exhaust gas purification device (in the literature, "exhaust gas treatment device [ 41 ]) that purifies the exhaust gas of the engine; a harvesting part (a harvesting and conveying device [ 14 ] in the literature), which is arranged in front of the driving part and used for harvesting and planting the grain stalks; and a threshing device (in the literature, "threshing device (15)") which is provided behind the harvesting unit and which threshes the harvested grain stalks, wherein the combine harvester is provided with: a harvesting clutch which switches on/off power transmission to the harvesting part; a threshing clutch for connecting/disconnecting power transmission to the threshing device; and a single clutch switching lever (in the literature, "clutch lever [ 36 ]), which switches the on state and the off state of both the harvesting clutch and the threshing clutch.

[3]

Conventionally, as a combine harvester, for example, a combine harvester described in patent document 1 is known. Patent document 1 discloses a combine harvester including an operation state switching device (a "clutch operation device [ a ] in the document) for switching operation states of a plurality of operation devices at appropriate timings. The operating state switching device of patent document 1 includes: a plurality of arms (in the document, "cam followers [ 85 ], etc.) which are swingable about a first swing shaft center (in the document," shaft center of the pivot support shaft [ 78 ]) and are provided in a state of being juxtaposed in a first swing shaft center direction, a plurality of arms (in the document, "cam followers [ 84 ], etc.) which are swingable about a second swing shaft center (in the document," shaft center of the pivot support shaft [ 77 ]) and are provided in a state of being juxtaposed in a second swing shaft center direction, a plurality of cams (in the document, "shaft center of the cam shaft [ 80 ]) which are rotatable about the same rotation shaft center (in the document," shaft center of the cam shaft [ 80 ]) which is parallel to the first and second swing shaft centers and are provided in a state of being juxtaposed in a rotation shaft center direction (in the document, "first to third cam plates [ 81 ], [ 82 ], [ 83 ]), and a drive actuator (in the document," electric motor [ 70 ]), A plurality of wire ropes (an operation rope [ 40a ] and the like in the literature) which connect the arm on the first swing shaft center side and the working device and extend from the respective arms on the first swing shaft center side, and a plurality of wire ropes (an operation rope [ 5a ] and the like in the literature) which connect the arm on the second swing shaft center side and the working device and extend from the respective arms on the second swing shaft center side.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-268365

Patent document 2: japanese patent laid-open publication No. 2015-130810

Disclosure of Invention

Problems to be solved by the invention

[1]

The technical problems corresponding to the background art [1] are as follows.

In the combine harvester described in patent document 1, the operation state switching device is provided between the threshing device and the grain storage unit. However, in the combine harvester described in patent document 1, the space for providing the operating state switching device is small, and there is room for improvement in that the operating state switching device can be easily disposed.

In view of the above, a combine harvester in which the operating state switching device is easily configured is desired.

[2]

The technical problems corresponding to the background art [2] are as follows.

In the combine harvester described in patent document 2, when the position detection sensor is provided at the base of the clutch switching lever in order to detect the operating position of the clutch switching lever, the position detection sensor is located in the vicinity of the exhaust gas purification device. In this case, there are such hidden troubles as: the position detection sensor is affected by the hot air of the exhaust gas purification apparatus, causing a malfunction.

In view of the above, a combine harvester is desired in which a position detection sensor that detects the operation position of the clutch switching lever is less susceptible to the influence of the hot air of the exhaust gas purification device.

[3]

The technical problems corresponding to the background art [3] are as follows.

The operating state switching device of patent document 1 includes a plurality of arms on the first swing axis side and a plurality of arms on the second swing axis side, and in addition, wire ropes extend from the plurality of arms on the first swing axis side, respectively, and wire ropes extend from the plurality of arms on the second swing axis side, respectively. Therefore, the number of components constituting the operation state switching device increases. Further, the plurality of wire ropes on the first swing axis side and the plurality of wire ropes on the second swing axis side are staggered.

In view of the above circumstances, a combine harvester capable of simply constituting an operation state switching device is desired.

Means for solving the problems

[1]

The solution corresponding to the technical problem [1] is as follows.

The invention provides a combine harvester, comprising: a harvesting part for harvesting the vertical grain stalks; a threshing device for threshing the harvested rice straw; and a grain storage unit that is provided in a manner that is horizontally juxtaposed to the threshing device and stores grains after threshing, wherein the combine harvester is provided with: a longitudinal conveying device which is provided at a lateral side portion of the threshing device on the grain storage portion side and conveys grains subjected to threshing processing upward toward the grain storage portion; and an operating state switching device for switching operating states of the plurality of operating devices at appropriate timings, the operating state switching device being provided between the threshing device and the grain storage unit on a rear side of the longitudinal conveyor.

Between the threshing device and the grain storage part, more surplus space exists at the rear side of the longitudinal conveying device. According to this feature, the operating state switching device can be easily disposed by utilizing this space.

In the present invention, it is preferable that the threshing device is provided at a lower portion thereof with an interval in a front-rear direction of the machine body: a primary screw conveyor for conveying grains of a primary material to the grain storage portion side in a left-right direction of the body; and a secondary screw conveyor that conveys grains of a secondary object to the grain storage portion side in a left-right direction of the body, the primary screw conveyor and the secondary screw conveyor being respectively arranged to be detachable from a lateral side portion of the threshing device on the grain storage portion side, the operating state switching device being provided between the primary screw conveyor and the secondary screw conveyor in a front-rear direction of the body.

According to this characteristic structure, the primary screw conveyor and the secondary screw conveyor can be detached so that the operating state switching device is not easily hindered.

In the present invention, it is preferable that the grain storage portion is a grain storage box, a secondary returning device is provided at a lateral side portion of the threshing device on the side of the grain storage portion, the secondary returning device returns the grains of the secondary material from the secondary screw conveyor to a front portion of the threshing device, and the operation state switching device is provided below a portion of the grain storage box which is narrowed downward.

According to this characteristic structure, the operating state switching device can be easily disposed by utilizing the space (dead space) below the downwardly narrowed shape portion in the grain storage box.

In the present invention, it is preferable that a fuel tank is provided between the threshing device and the grain storage unit at the rear of the operation state switching device.

According to this feature, the fuel tank can be easily disposed in the space behind the operating state switching device.

Further, in the present invention, it is preferable that the operation state switching device is supported by a main frame extending in the front-rear direction of the machine body in the machine body frame.

According to this characteristic structure, the main frame can be used as a member for supporting the operating state switching device, and the operating state switching device can be firmly supported.

In the present invention, it is preferable that the body frame has a lateral frame extending in the body left-right direction in a state of intersecting the main frame, and the operation state switching device is supported at an intersection where the main frame and the lateral frame intersect.

According to this characteristic configuration, if the intersection portion between the main frame and the lateral frame is provided, the structure of the support operation state switching device can be made more rigid.

In the present invention, it is preferable that a platen be provided at the intersection, and the operation state switching device be detachably mounted and supported on the platen.

According to this characteristic configuration, the mounting surface on which the operating state switching device is mounted and supported is wide, and the operating state switching device can be supported more firmly. Further, by detaching the operation state switching device, maintenance of the operation state switching device can be performed more easily.

In the present invention, it is preferable that the work device includes: a harvesting clutch which switches on/off power transmission to the harvesting part; and a threshing clutch that turns on/off power transmission to the threshing device, the operating state switching device including: a harvest wire rope coupled to the harvest clutch; and a threshing wire rope coupled to the threshing clutch, the harvesting wire rope and the threshing wire rope extending forward from the operating state switching device.

According to this characteristic structure, the reaping wire rope and the threshing wire rope easily pass between the threshing device and the grain storage part.

Further, in the present invention, it is preferable that: a driving part having a driving seat and a side panel provided on one side of the driving seat in the left-right direction of the machine body; and an engine room provided below the cab and accommodating an engine and an exhaust gas purification device for purifying exhaust gas of the engine, wherein the exhaust gas purification device is provided below the side panel.

According to this feature, the exhaust gas purifying device can be easily disposed by utilizing the space below the side panel.

In the present invention, it is preferable that the work device includes: a harvesting clutch which switches on/off power transmission to the harvesting part; and a threshing clutch that turns on/off power transmission to the threshing device, the combine harvester including: and a clutch switching lever for switching between an on state and an off state of either or both of the harvesting clutch and the threshing clutch, the clutch switching lever being provided on the side panel, and the exhaust gas purification device being provided below the clutch switching lever.

According to this characteristic structure, the operating member for the harvesting clutch and the operating member for the threshing clutch can be made common by the clutch switching lever. Further, the exhaust gas purification device can be easily disposed by utilizing a space below the clutch switching lever.

Further, in the present invention, it is preferable that: and the exhaust pipe is used for discharging the exhaust gas purified by the exhaust purification device, and is arranged between the threshing device and the grain storage part in a mode of passing through the upper part of the working state switching device.

According to this feature, the exhaust pipe can be easily disposed in the space above the operating state switching device.

[2]

The solution corresponding to the technical problem [2] is as follows.

The invention provides a combine harvester, comprising: a driving part having a driving seat and a side panel provided on one side of the driving seat in the left-right direction of the machine body; an engine room provided below the driver's seat and accommodating an engine and an exhaust gas purification device for purifying exhaust gas of the engine; a harvesting part which is arranged in front of the driving part and harvests and plants the vertical grain stalks; and a threshing device provided behind the harvesting unit and threshing the harvested straw, wherein the combine harvester comprises: a harvesting clutch which switches on/off power transmission to the harvesting part; a threshing clutch which switches on/off power transmission to the threshing device; a single clutch switching lever that switches between an on state and an off state of both the harvesting clutch and the threshing clutch; and a position detection sensor that detects an operation position of the clutch switching lever, the clutch switching lever being provided on the side panel and being capable of changing positions to a first operation position, a second operation position, and a third operation position, the first operation position being an operation position at which both the harvest clutch and the threshing clutch are in an on state, the second operation position being an operation position at which the harvest clutch is in an off state and the threshing clutch is in an on state, the third operation position being an operation position at which both the harvest clutch and the threshing clutch are in an off state, the exhaust gas purification device being provided below the side panel, the position detection sensor being provided below the side panel and above the exhaust gas purification device, and a position detection sensor being provided between the exhaust gas purification device and the position detection sensor to vertically divide a space between the exhaust gas purification device and the position detection sensor A dividing wall.

According to this characteristic configuration, the exhaust gas purifying device and the position detecting sensor are vertically partitioned by the partition wall, and therefore, the hot air of the exhaust gas purifying device directed to the position detecting sensor is blocked by the partition wall. Thus, the position detection sensor is less susceptible to the hot air of the exhaust gas purification apparatus.

In the present invention, it is preferable that the clutch switching lever is a swing operation type lever, a swing support portion that swingably supports the clutch switching lever is mounted on and supported by an upper surface portion of the partition wall, and the position detection sensor is supported by the swing support portion.

According to this characteristic structure, the partition wall can be used as a member for supporting the swing support portion. Further, the swing support portion can be used as a member for supporting the position detection sensor, and the position detection sensor is located in the vicinity of the lever support shaft of the clutch switching lever, so that the operating position of the clutch switching lever around the swing shaft center can be detected with high accuracy by the position detection sensor.

In the present invention, it is preferable that the clutch switching lever is a swing operation type lever, a swing support portion for swingably supporting the clutch switching lever is hung and supported on a lower surface of an upper surface portion of the side plate, and the position detection sensor is supported by the swing support portion.

According to this feature, the side plate can be used as a member for supporting the swing support portion. Further, the swing support portion can be used as a member for supporting the position detection sensor, and the position detection sensor is located in the vicinity of the lever support shaft of the clutch switching lever, so that the operating position of the clutch switching lever around the swing shaft center can be detected with high accuracy by the position detection sensor.

Further, in the present invention, it is preferable that the exhaust gas purification device is located rearward and downward with respect to the position detection sensor, and the partition wall has: a bottom portion covering the position detection sensor from below; and a rear wall portion covering the position detection sensor from behind.

According to this feature, the position detection sensor is less susceptible to the influence of the hot gas of the exhaust gas purification apparatus than in the case where the exhaust gas purification apparatus is located directly below the position detection sensor. Further, the bottom portion and the rear wall portion can shield the hot air heading to the exhaust gas purification device of the position detection sensor from below and behind.

Further, in the present invention, it is preferable that the partition wall spans left and right side portions of the side panels.

According to this characteristic configuration, the hot air heading for the exhaust gas purification device of the position detection sensor can be blocked by the partition wall over a wide range spanning the left-right width of the side panel.

Further, in the present invention, it is preferable that a main shift lever of a forward-backward swing operation type for performing a shift operation of a main shift device and a sub-shift lever of a forward-backward swing operation type for performing a shift operation of a sub-shift device are provided in parallel in a lateral direction on the side panel, and the main shift lever is arranged such that: the clutch switching lever is provided behind the main shift lever, and the main shift lever is positioned on the opposite side of the driver seat in the left-right direction of the body, and the main shift lever has a longer protruding length of a portion protruding from the upper surface of the side panel than a protruding length of a portion protruding from the upper surface of the side panel.

According to this characteristic structure, the protruding length of the portion of the main shift lever that protrudes from the upper surface of the side panel is longer than the protruding length of the portion of the sub-shift lever that protrudes from the upper surface of the side panel, and therefore the height position of the elbow of the rider who grips the main shift lever is higher than the height position of the elbow of the rider who grips the sub-shift lever. In this case, if the clutch switching lever is provided behind the sub-shift lever, when the driver holds the sub-shift lever and performs a forward-backward swing operation, the height position of the elbow of the driver holding the sub-shift lever is low, and the elbow of the driver is likely to hit the sub-shift lever. However, according to this characteristic configuration, since the clutch switching lever is provided behind the main shift lever, when the driver grips the main shift lever and performs the back-and-forth swing operation, the height position of the elbow of the driver gripping the main shift lever is high, and therefore the elbow of the driver is less likely to touch the main shift lever. Further, since the clutch switching lever is positioned on the opposite side of the sub-shift lever from the driver's seat in the left-right direction of the body, the clutch switching lever is less likely to cause interference when the driver operates the sub-shift lever from the driver's seat.

Further, in the present invention, it is preferable that the clutch switching lever is a swing operation type lever and is configured to be capable of being swing-operated after being subjected to a preparatory operation.

According to this characteristic configuration, a preliminary operation is required to swing the clutch switching lever. This makes it difficult for the driver to erroneously operate the clutch switching lever.

Further, in the present invention, it is preferable that the clutch switching lever further includes a guide portion that guides the clutch switching lever, the guide portion including: a linear portion extending linearly in a swing operation direction of the clutch switching lever; and an entering portion having a shape that is continuous with the linear portion and is entered in a direction intersecting a swing operation direction of the clutch switching lever, the entering portion being provided at a position corresponding to the first operation position, a position corresponding to the second operation position, and a position corresponding to the third operation position, respectively, the combine harvester includes an urging member that urges the clutch switching lever toward a side where the entering portion enters, and the clutch switching lever is configured such that: the clutch switching lever is configured to be capable of being operated to swing along the linear portion after being operated to disengage the clutch switching lever from the entry portion against the biasing force of the biasing member as the preliminary operation.

According to this characteristic configuration, the clutch switching lever is biased by the biasing member to swing toward the side of the entry portion in the state of entering the entry portion, whereby the clutch switching lever can be held at each operating position. Further, if the driver does not disengage the clutch switching lever from the entering portion against the biasing force of the biasing member, the driver cannot swing the clutch switching lever, and erroneous operation of the clutch switching lever by the driver is less likely to occur.

In the present invention, it is preferable that a swing support portion for supporting the clutch switching lever in a swingable manner is placed and supported on an upper surface portion of the partition wall, and the guide portion is provided above the swing support portion.

According to this characteristic structure, the partition wall can be used as a member for supporting the swing support portion. Further, the guide portion is configured to be suitable for guiding the clutch switching lever.

In the present invention, it is preferable that the guide portion is formed on an upper surface portion of the side panel.

According to this feature, the guide portion can be formed by using the upper surface portion of the side panel.

In the present invention, it is preferable that a press-operated switch is provided in a grip portion of the clutch switching lever, and the clutch switching lever is configured to: the operation can be performed by a swing operation after the pressing operation of the switch as the preliminary operation is performed.

According to this characteristic configuration, the configuration relating to the preliminary operation is a control configuration implemented by a push-operated switch, and the configuration relating to the preliminary operation can be simplified.

[3]

The solution corresponding to the technical problem [3] is as follows.

The present invention is a combine harvester including an operating state switching device that switches operating states of a plurality of operating devices at appropriate timings, wherein the operating state switching device includes: a plurality of arms which can swing around the same swing axis and are arranged in parallel along the direction of the swing axis; a plurality of cams that are rotatable about the same rotation axis parallel to the swing axis and are provided in parallel in the direction of the rotation axis so as to correspond to the plurality of arms, respectively; a drive actuator that rotationally drives the plurality of cams; and a plurality of wire ropes that connect the plurality of arms and the plurality of working devices, respectively, and extend in the same direction from the plurality of arms, respectively, wherein the plurality of cams are rotationally driven by the drive actuator, and thereby the plurality of arms are swung on the same side around the swing axis by the action of the cams, and the plurality of arms respectively pull the plurality of wire ropes, thereby switching the operating states of the plurality of working devices at appropriate timings.

According to this characteristic structure, the plurality of arms can swing about the same swing axis center, and the plurality of arms can swing about the swing axis center to the same side by the action of the cam. Therefore, the number of parts constituting the operation state switching device is reduced as compared with, for example, a configuration including a plurality of arms swingable about the first swing axis center and a plurality of arms swingable about the second swing axis center. Further, since the plurality of wire ropes extend in the same direction from the plurality of arms, the wire ropes are easily arranged so as not to intersect with each other. That is, according to the characteristic configuration, it is possible to realize a combine harvester in which the operating state switching device can be simply configured.

In the present invention, it is preferable that the operating state switching device includes a housing that houses the plurality of arms and the plurality of cams, wherein upper end portions of the plurality of arms protrude upward from the housing, and the wire ropes are connected to upper end portions of the arms, and the wire ropes extend in a horizontal direction while passing above the cams.

According to this characteristic structure, the plurality of wire ropes are collectively arranged above the cam, and it is easier to arrange the plurality of wire ropes so as not to cross each other.

In the present invention, it is preferable that a support portion for supporting the wire rope is provided on a side portion of the housing opposite to the side on which the arm is provided with respect to the cam.

According to this characteristic configuration, the portion of the wire rope distant from the arm is supported by the support portion, and thus the wire rope can be prevented from slackening.

In the present invention, it is preferable that the housing has a bottom and a side wall and is opened upward, and an upper cover for opening and closing a portion of the housing opened upward is provided, and the side wall covers the plurality of arms and the plurality of cams from front, rear, left, and right directions.

According to this feature, external dust can be prevented from entering the housing from a portion of the housing that opens upward. Further, by detaching the upper cover, cleaning and the like of the inside of the case can be easily performed.

In the present invention, it is preferable that a cleaning opening is formed in a portion of the bottom portion on a side opposite to a side where the arm is located with respect to the cam, and a bottom cover for opening and closing the cleaning opening is disposed.

According to this feature, by detaching the bottom cover, dust inside the housing can be easily discharged to the outside from the cleaning port. Further, the arm is less likely to cause an obstacle when dust is discharged from the cleaning port to the outside.

In the present invention, it is preferable that a support shaft is provided so as to straddle wall portions of the side walls that face each other in the direction of the pivot axis, and the plurality of arms are supported so as to be pivotable about the pivot axis, and an arm of the plurality of arms, which has a larger force applied when the wire rope is pulled, is supported at a portion of the support shaft that is closer to the wall portion.

According to this characteristic configuration, even when a large force acts on the arm when pulling the wire rope, the support shaft is not easily deformed because the arm is supported by a portion (root side) of the support shaft close to the wall portion.

In the present invention, it is preferable that the relay for the drive actuator is supported by a wall portion of the side wall on the side of the wire rope in the extending direction.

According to this feature, the side wall can be used as a member for supporting the relay. Further, in the case where the driving actuator is supported by the wall portion in the rotational axial direction of the side wall, the relay does not easily interfere with the driving actuator.

In the present invention, it is preferable that a control device for a device different from the operation state switching device is supported by a wall portion of the side wall different from the wall portion supporting the relay.

According to this characteristic structure, the side wall can be used as a member for supporting the control device. Further, it is also preferable from the viewpoint of effective utilization of a plurality of wall portions in the side wall.

Further, in the present invention, it is preferable that: and a rotation angle detection sensor that detects a rotation angle of the cam, wherein the drive actuator is supported by a wall portion on one side of the side wall in the direction of the rotation axis, and the rotation angle detection sensor is supported by a wall portion on the other side of the side wall in the direction of the rotation axis.

According to this characteristic structure, the side wall can be used as a member for supporting the driving actuator and the rotation angle detection sensor. The drive actuator and the rotation angle detection sensor are located in the rotation axis direction, and are preferably rotationally driven by the drive actuator and the rotation angle detection by the angle detection sensor.

In the present invention, it is preferable that an attachment portion for attaching the housing to the body is provided on an outer side portion of the housing.

According to this characteristic configuration, the housing is easily attached to the housing by being attached to the housing outside the housing.

Further, in the present invention, it is preferable that: a harvesting part for harvesting the vertical grain stalks; a threshing device for threshing the harvested rice straw; a grain storage box for storing the threshed grains; and a grain discharging device for discharging the grains in the grain storage box, wherein the working device comprises: a harvesting clutch which switches on/off power transmission to the harvesting part; a threshing clutch which switches on/off power transmission to the threshing device; and a grain discharging clutch that turns on/off power transmission to the grain discharging device, wherein a cam corresponding to the harvesting clutch and a cam corresponding to the threshing clutch among the plurality of cams are rotationally driven to one side around the rotational axis, and a cam corresponding to the grain discharging clutch among the plurality of cams is rotationally driven to the other side around the rotational axis.

According to this characteristic structure, the cam corresponding to the harvesting clutch and the cam corresponding to the threshing clutch are rotationally driven to one side around the rotational axis, and thus the harvesting unit and the threshing device are preferably driven at the same time. Further, the cam corresponding to the grain discharging clutch is rotationally driven to the other side around the rotational axis, and thus, it is preferable in the operation mode of driving the grain discharging device to be driven separately from the harvesting unit and the threshing device.

Further, in the present invention, it is preferable that the operating state switching device has a housing that accommodates the plurality of arms and the plurality of cams, the housing having: a bottom; and a side wall that covers the plurality of arms and the plurality of cams from the front, the rear, the left, and the right, wherein the combine harvester is provided with a support shaft that spans wall portions of the side wall that face each other in the direction of the swing axis center to support the plurality of arms so as to be able to swing around the swing axis center, and the plurality of arms are supported by the support shaft in a state where: an arm corresponding to the harvesting clutch and an arm corresponding to the threshing clutch of the plurality of arms sandwich an arm corresponding to the grain discharging clutch of the plurality of arms from both sides in the direction of the swing shaft center.

Generally, the force acting on the arm corresponding to the harvest clutch when the wire rope is pulled and the force acting on the arm corresponding to the threshing clutch when the wire rope is pulled are larger than the force acting on the arm corresponding to the grain discharge clutch when the wire rope is pulled. According to this characteristic configuration, even when a large force is applied to the arm corresponding to the harvest clutch and the arm corresponding to the threshing clutch when the wire rope is pulled, the support shaft is not easily deformed because these arms are supported by a portion (root portion side) of the support shaft close to the wall portion.

Drawings

Fig. 1 is a right side view showing a general type combine harvester.

Fig. 2 is a plan view showing a general type combine.

Fig. 3 is a left side sectional view showing the threshing device.

Fig. 4 is a diagram showing a power transmission path of the combine harvester.

Fig. 5 is a left side view showing the cab portion.

Fig. 6 is a plan sectional view showing the cab portion.

Fig. 7 is a rear sectional view showing the cab portion and the engine room.

Fig. 8 is a right sectional view showing the cab portion and the engine room.

Fig. 9 is a left side sectional view showing the clutch switching lever.

Fig. 10 is a plan view showing the clutch switching lever.

Fig. 11 is a rear sectional view showing the clutch switching lever.

Fig. 12 is a right side view showing the clutch switching device and the peripheral configuration of the clutch switching device.

Fig. 13 is a plan view showing the clutch switching device and the peripheral structure of the clutch switching device.

Fig. 14 is a rear view showing the clutch switching device and the peripheral configuration of the clutch switching device.

Fig. 15 is an exploded perspective view showing the clutch switching device.

Fig. 16 is a right sectional view showing the clutch switching device.

Fig. 17 is a top cross-sectional view showing the clutch switching device.

Fig. 18 is a diagram showing a control block.

Fig. 19 is a view showing the rotational positions of the first, second, and third cams.

Fig. 20 is a diagram showing the correspondence between the rotational positions of the first, second, and third cams and the states of the harvest clutch, the grain discharge clutch, and the threshing clutch.

Fig. 21 is a plan view showing a driver part according to another embodiment.

Fig. 22 is a left side view showing a driver's part according to another embodiment.

Fig. 23 is a left side sectional view showing a clutch switching lever according to another embodiment.

Fig. 24 is a rear sectional view showing a clutch switching lever according to another embodiment.

Detailed Description

Embodiments of the present invention will be described based on the drawings. In the following description, the direction of arrow F is referred to as "front side of the body" (see fig. 1 and 2), the direction of arrow B is referred to as "rear side of the body" (see fig. 1 and 2), the direction of arrow L is referred to as "left side of the body" (see fig. 2), and the direction of arrow R is referred to as "right side of the body" (see fig. 2).

[ integral structure of combine harvester ]

A conventional combine harvester is shown in fig. 1 and 2. The combine harvester is a combine harvester (whole stalk feeding type combine harvester) for threshing the whole stalks of the harvested stalks. The combine harvester is provided with a machine body frame 1 and a crawler belt running device 2. A harvesting part 3 for harvesting and planting vertical grain stalks is arranged in front of the running machine body. The harvesting part 3 is provided with a raking reel 4 for raking and planting vertical grain stalks, a harvesting knife 5 for cutting off the vertical grain stalks and a raking auger 6 for raking and harvesting the grain stalks.

A cab portion 7 is provided on the right side of the front portion of the travel machine body. The cab portion 7 includes a cab 8 on which a driver rides, and a cab 9 covering the cab 8. An engine room ER is provided below the driver section 8. The engine compartment ER accommodates an engine E, an exhaust gas purification device 10, a cooling fan 11, and a radiator 12 (see fig. 7). A threshing device 13 for threshing the harvested rice straws is arranged behind the harvesting part 3. A feeder 14 for conveying the harvested grain stalks to the threshing device 13 is provided across the harvesting part 3 and the threshing device 13. A grain storage tank 15 for storing grains after threshing is provided in parallel with the threshing device 13 in the transverse direction. The grain storage box 15 is configured to be swingable to open and close so as to straddle the working position and the maintenance position about an axial center Z1 extending in the vertical direction. A fuel tank 16 is provided between the rear part of the threshing device 13 and the rear part of the grain storage box 15.

A grain discharging device 17 for discharging the grains in the grain storage box 15 to the outside is provided. The grain discharge device 17 includes: a vertical conveying part 18 for conveying the grains in the grain storage box 15 upward; and a horizontal conveying section 19 for conveying the grains from the vertical conveying section 18 toward the outside of the machine body. The grain discharging device 17 is disposed so as to be rotatable around an axial center Z1 of the longitudinal conveying section 18. The lower end of the longitudinal conveying part 18 is connected to the bottom of the grain storage box 15. The end of the horizontal conveying section 19 on the side of the vertical conveying section 18 is connected to the upper end of the vertical conveying section 18, and is supported by the upper end of the vertical conveying section 18 so as to be vertically swingable.

A transmission T for shifting the power from an engine E is provided. The transmission T includes a hydraulic continuously variable transmission (HST)20 as a main transmission device and a transmission case 21 (see fig. 4). The transmission case 21 houses a gear type sub-transmission device and the like.

[ threshing device ]

As shown in fig. 3, a threshing chamber 22 is formed at the upper part of the threshing device 13. The threshing chamber 22 is provided with a threshing cylinder 23 so as to be rotatable about a rotation axis Y1 extending in the front-rear direction of the machine body. A receiving net 24 is arranged below the threshing cylinder 23. The lower part of the threshing device 13 is provided with: an oscillating sorting device 25 for oscillating sorting of objects to be sorted, a wind turbine 26 for feeding a sorting wind to the oscillating sorting device 25, a primary recovery unit 27 for recovering grains of primary products (such as singulated grains), and a secondary recovery unit 28 for recovering grains of secondary products (such as branched grains). The primary recovery unit 27 is provided with a primary screw conveyor 29 for conveying grains of the primary product to the right. The secondary recovery unit 28 is provided with a secondary screw conveyor 30 for conveying grains of the secondary product to the right. The primary screw conveyor 29 and the secondary screw conveyor 30 are provided at intervals in the front-rear direction of the body. The primary and secondary augers 29, 30 are configured to be detachable from the right side portion of the threshing device 13, and the primary and secondary augers 29, 30 can be pulled out from the right side portion of the threshing device 13 in a state where the grain storage box 15 is located at the maintenance position. The right side portion of the threshing device 13 is provided with: a vertical conveying device 31 for conveying the grains of the primary product from the primary screw conveyor 29 upward toward the grain storage box 15; and a secondary return device 32 for returning the grains of the secondary products from the secondary screw conveyor 30 to the front of the swing sorting device 25.

[ Power Transmission Path ]

As shown in fig. 4, a travel transmission mechanism 34 that transmits the driving force of the engine E to the HST20 via a belt is provided. The driving force of the engine E is transmitted to the crawler belt unit 2 after being shifted by the HST20 and the subtransmission device.

A grain discharging transmission mechanism 36 is provided for transmitting the driving force of the engine E to the grain discharging device 17 via a transmission belt 35. A grain discharging clutch 37 is provided for turning on/off the power transmission to the grain discharging device 17 by the grain discharging transmission mechanism 36. The grain discharge clutch 37 is constituted by a belt-tension type clutch.

A threshing transmission mechanism 39 is provided for transmitting the driving force of the engine E to the windmill 26 via a transmission belt 38. A threshing clutch 40 is provided for turning on/off the power transmission to the wind turbine 26 by the threshing transmission mechanism 39. The threshing clutch 40 is constituted by a belt-tensioning clutch.

A belt transmission mechanism 41 is provided for transmitting the power of the windmill 26 to the primary screw conveyor 29 and the secondary screw conveyor 30. A bevel gear transmission mechanism 42 is provided for transmitting the power of the primary screw conveyor 29 to the longitudinal conveyor 31. A chain transmission 43 and a bevel gear transmission 44 are provided for transmitting the power of the secondary screw conveyor 30 to the secondary returning device 32.

A belt transmission mechanism 46 is provided for transmitting the power of the wind turbine 26 to the relay shaft 45. A bevel gear transmission mechanism 48 is provided for transmitting the power of the relay shaft 45 to the threshing cylinder 23 and the relay shaft 47. A harvesting transmission 50 is provided that transmits the power of the relay shaft 45 to the feeder 14 via a transmission belt 49. A harvesting clutch 51 is provided that switches on/off the power transmission to the feeder 14 by the harvesting transmission 50. The harvesting clutch 51 is constituted by a belt-tensioning clutch.

[ cab part ]

As shown in fig. 5 to 8, the cab 9 includes: a roof 52, a front window 53, side glasses 54, a rear window 55, and a landing door 56. The driver unit 8 includes: a driver seat 57, a front panel 58, a side panel 59, and a grain discharge operation unit 60. The front panel 58 is provided with a steering rod 61 and an instrument panel 62. The steering lever 61 performs operations such as steering of the traveling machine body and lifting and lowering of the harvesting unit 3.

A front cover 63 is provided in front of the cab 8. A front pillar 64 is provided in the front of the left side portion of the cab 8. A rear pillar 65 is provided at the rear of the left side portion of the cab 8. A lower frame 66 extending in the machine body front-rear direction is provided across the front pillar 64 and the rear pillar 65. The front end portion of the lower frame 66 is supported by the front pillar 64, and the rear end portion of the lower frame 66 is supported by the rear pillar 65. The lower frame 66 is located below the exhaust gas purification device 10.

The grain discharge operation unit 60 is provided on the right rear side of the driver seat 57. The grain discharge operation unit 60 is provided with: a clutch switching operation part for switching the grain discharging clutch 37 between the on state and the off state, a rotation operation part for rotating the grain discharging device 17, and an elevation operation part for elevating the grain discharging device 17 (horizontal conveying part 19).

[ exhaust gas purification device ]

The exhaust gas purification device 10 performs a purification process of exhaust gas of the engine E by a DPF (Diesel Particulate Filter). The exhaust gas purifying device 10 is provided below the side plate 59 and above the engine E in a posture in which the longitudinal direction thereof is along the front-rear direction of the machine body. The exhaust gas purification device 10 is provided below the side panel 59 in a state of protruding leftward from the left end 59a of the side panel 59. The entire exhaust gas purification apparatus 10 is covered from above by the ceiling plate 67 and not only the portion protruding in the exhaust gas purification apparatus 10. The exhaust gas purification apparatus 10 is mounted and supported on the upper portion of the engine E. The exhaust gas purification apparatus 10 is coupled to the engine E via front and rear supports 68.

[ exhaust pipes ]

As shown in fig. 12 to 14, an exhaust pipe 69 is provided for discharging the exhaust gas purified by the exhaust gas purifying device 10. The exhaust pipe 69 is drawn out leftward from the rear portion of the left side surface of the outer peripheral portion of the exhaust gas purification apparatus 10, and extends rearward and upward. The exhaust pipe 69 is provided so as to pass through between the threshing device 13 and the grain storage box 15, and more specifically, to pass through the clutch switching device 70 and above the fuel tank 16, which will be described later. An outside air introduction portion 76 for introducing outside air into the exhaust pipe 69 in order to lower the exhaust temperature is formed in the exhaust pipe 69, for example, between the exhaust upstream end portion 71 connected to the exhaust purification apparatus 10 and the portion 72 on the exhaust downstream side of the exhaust upstream end portion 71. A front pedal 77 and a rear pedal 78 are provided above the exhaust pipe 69 between the cab portion 7 and the grain storage tank 15 and the threshing device 13.

[ side panels ]

As shown in fig. 5 to 8, the side panel 59 is provided on the left side of the driver seat 57. The side plate 59 is provided with a main shift lever 79, a sub-shift lever 80, and a clutch switching lever 81. A position detection sensor 82 that detects the operation position of the clutch switching lever 81 is provided below the side plate 59 and above the exhaust gas purification apparatus 10.

The main shift lever 79 is a forward-backward swing operation type lever, and shifts the HST 20. The sub-shift lever 80 is a lever of a forward-backward swing operation type, and performs a shifting operation of the sub-transmission. The main shift lever 79 and the sub-shift lever 80 are laterally juxtaposed such that the main shift lever 79 is located on the left side and the sub-shift lever 80 is located on the right side. That is, the main shift lever 79 is located on the opposite side of the driver seat 57 in the body right-left direction with respect to the sub shift lever 80. Here, when the projection length of the portion of the main shift lever 79 projecting from the upper surface of the side panel 59 is set to L1 and the projection length of the portion of the sub shift lever 80 projecting from the upper surface of the side panel 59 is set to L2, the main shift lever 79 is arranged such that the projection length L1 is longer than the projection length L2.

There is an upper frame 83 supporting the side panels 59. The upper frame 83 includes a top plate 67. The ceiling plate 67 is provided between the exhaust gas purification apparatus 10 and the position detection sensor 82, vertically partitions the exhaust gas purification apparatus 10 and the position detection sensor 82, and covers the entire exhaust gas purification apparatus 10 from above, not only the protruding portion of the exhaust gas purification apparatus 10. The top plate 67 straddles the front and rear ends in the side panel 59 and straddles the left and right sides in the side panel 59.

A front cover 135 covering the exhaust gas purification apparatus 10 from the front side is provided in a space below the side plate 59. The space below the side plate 59 is partitioned into a front space and a rear space (a space on the side where the exhaust gas purification apparatus 10 is located) by the front cover 135. The upper end of the front cover 135 is supported by the top plate 67 via a support 136.

[ shade ]

A cover 84 is provided to cover the space below the side plate 59 from the left side with respect to the exhaust gas purification apparatus 10. Cover 84 extends in the machine body front-rear direction such that the front end of cover 84 is positioned further forward than the front end of side panel 59 and the rear end of cover 84 is positioned further rearward than the rear end of side panel 59. A notch 84a is formed in the rear portion of the cover 84 so as not to interfere with the exhaust upstream end portion 71 of the exhaust pipe 69. The cover 84 is formed with a raised portion 84b that is raised to the left side of the other portions. That is, in the cover 84, a portion (the raised portion 84b) located adjacent to the exhaust gas purification device 10 in the lateral direction is raised leftward than other portions in a plan view.

The cover 84 is configured to: supported by the upper frame 83 and the lower frame 66, and detachably attached to the upper frame 83 and the lower frame 66. The portion of the upper frame 83 corresponding to the ridge portion 84b protrudes to the left side than the other portion. A portion of the lower frame 66 corresponding to the ridge portion 84b protrudes leftward than other portions. The upper portion of the cover 84 is detachably fixed to the vertical wall portion 83a of the upper frame 83 by a bolt 85. A support member 86 extending upward from the lower frame 66 is provided on the lower frame 66. The lower portion of the cover 84 is removably fixed to the support member 86 by bolts 87.

[ longitudinal frame ]

A vertical frame 88 extending in the vertical direction across the upper frame 83 and the lower frame 66 is provided. The vertical frame 88 is positioned on the left side with respect to the hood 84, and is provided in a state of overlapping with the hood 84 in side view. That is, the vertical frame 88 is positioned on the left side with respect to the exhaust gas purification device 10, and is provided in a state of overlapping with the exhaust gas purification device 10 in a side view. The longitudinal frame 88 is configured to: supported by the upper frame 83 and the lower frame 66, and detachably attached to the upper frame 83 and the lower frame 66. The upper end of the vertical frame 88 is detachably fixed to the vertical wall 83a of the upper frame 83 by a bolt 85 together with the upper part of the cover 84. The lower frame 66 is provided with a support member 89 extending downward from the lower frame 66. The lower end of the vertical frame 88 protrudes downward from the lower end of the lower frame 66, and is detachably fixed to a support 89 by a bolt 90.

[ Clutch switching lever ]

As shown in fig. 9 to 11, the clutch switching lever 81 is a lever of a forward and backward swing operation type, and is a single lever that performs switching operation between the on state and the off state of both the harvesting clutch 51 and the threshing clutch 40. The clutch switching lever 81 is configured to be position-changeable to a first operating position O1, a second operating position O2, and a third operating position O3. The first operating position O1 is an operating position at which both the harvest clutch 51 and the threshing clutch 40 are in the on state. The second operating position O2 is an operating position in which the harvesting clutch 51 is in the off state and the threshing clutch 40 is in the on state. The third operating position O3 is an operating position at which both the harvest clutch 51 and the threshing clutch 40 are in a disengaged state. The clutch switching lever 81 is provided behind the main shift lever 79.

The clutch switching lever 81 is arranged to be swingable back and forth about a swing shaft center X1 extending in the left-right direction of the machine body. The clutch switch lever 81 includes: a handle 91, a handle-side lever body 92, a spindle-side lever body 93, and a lever spindle 94. The handle-side lever 92 is coupled to the support shaft-side lever 93 via a hinge 95 with a spring (not shown) so as to be able to swing left and right. The spring biases the handle-side lever body 92 to swing leftward. The handle-side rod 92 is provided with a stopper 92a, and the stopper 92a abuts against the spindle-side rod 93 to restrict the handle-side rod 92 from swinging to the left.

[ Oscillating support ]

A swing support portion 96 is provided to support the clutch switching lever 81 so as to be able to swing about a swing axis X1. The swing support portion 96 also supports the position detection sensor 82. The swing support portion 96 is placed and supported on the upper surface portion of the top plate 67 inside the side plate 59. The swing support portion 96 is formed of a substantially L-shaped plate material. The swing support portion 96 includes a base portion 97 along the top plate 67 and a vertical wall portion 98 perpendicular or substantially perpendicular to the top plate 67. The base 97 is fixed to the top plate 67 by bolts 99. A boss portion 100 through which the lever support shaft 94 is inserted is provided in the vertical wall portion 98. A mounting portion 101 to which the position detection sensor 82 is mounted is provided on the left side portion of the vertical wall portion 98.

[ guide portion ]

A lever guide 103 having a guide portion 102 for guiding the clutch switching lever 81 is provided. The lever guide 103 is provided in a state of straddling the swing support portion 96 in the left and right direction. Leg portions 103a are formed at both left and right end portions of the lever guide 103. The leg 103a is fixed to the top plate 67 by a bolt 104. The guide portion 102 is provided in a portion of the lever guide 103 located above the swing support portion 96.

The guide portion 102 includes a linear portion 102a and an entering portion 102 b. The linear portion 102a extends linearly in the swing operation direction (front-rear direction) of the clutch switch lever 81. In the linear portion 102a, the width B2 of the section on the first operation position O1 side is narrower than the width B1 of the section spanning the second operation position O2 and the third operation position O3.

The entering portion 102b has a shape that enters in a direction (leftward direction) intersecting the swing operation direction of the clutch switching lever 81 while being continuous with the linear portion 102 a. The entering portions 102b are provided at a position corresponding to the first operation position O1, a position corresponding to the second operation position O2, and a position corresponding to the third operation position O3, respectively. The handle-side lever 92 is pivotally urged by the spring toward the entering portion 102b in a state of entering the entering portion 102b, whereby the clutch switching lever 81 is positionally held at each operation position.

The clutch switching lever 81 is a forward-backward swinging operation type lever as described above, and is configured to be capable of forward-backward swinging operation along the linear portion 102a after being preliminarily operated. Specifically, the clutch switch lever 81 is configured to: after the operation of disengaging the handle-side lever 92 from the entry portion 102b against the biasing force of the spring as the preliminary operation is performed, the operation can be performed to swing back and forth along the linear portion 102 a. Thus, while the clutch switching lever 81 cannot be operated to swing back and forth along the straight portion 102a in the state where the clutch switching lever 81 is held in position at each operating position, the handle-side lever 92 is operated to swing right against the urging force of the spring and disengaged from the entry portion 102b, and the clutch switching lever 81 can be operated to swing back and forth along the straight portion 102 a.

Here, when the clutch switching lever 81 is switched from the third operation position O3 side to the first operation position O1 in a state where the handle side lever body 92 is operated to swing to the right side, the handle side lever body 92 abuts on the end portion 102 of the guide portion 102, and the clutch switching lever 81 is prevented from swinging to the front side. Therefore, in order to release the contact with the end portion 102c of the guide portion 102, the clutch switching lever 81 needs to be operated to swing slightly to the left to swing the handle-side lever body 92 and then to swing forward.

[ Clutch switching device ]

As shown in fig. 12 to 17, a clutch switching device 70 is provided for switching the harvesting clutch 51, the threshing clutch 40, and the grain discharging clutch 37 between an on state and an off state at appropriate timings. The clutch switching device 70 is provided on the rear side of the longitudinal conveyor 31 between the threshing device 13 and the grain storage box 15. The clutch switching device 70 is provided between the primary screw conveyor 29 and the secondary screw conveyor 30 in the front-rear direction of the body. The clutch switching device 70 is provided below the downwardly narrowed shape portion 15a of the grain storage tank 15. In other words, the clutch switching device 70 is provided in a state of overlapping with the grain storage box 15 in a plan view. The clutch switching device 70 is provided in a state of overlapping with the base portion of the secondary loopback device 32 in side view. A fuel tank 16 is provided between the threshing device 13 and the grain storage box 15 at the rear of the clutch switching device 70.

The body frame 1 includes a main frame 1A extending in the front-rear direction of the body and a lateral frame 1B extending in the left-right direction of the body in a state of intersecting the main frame 1A. The clutch switching device 70 is supported at an intersection where the main frame 1A and the lateral frame 1B intersect. A platen 105 is provided at the intersection, and the clutch switching device 70 is detachably mounted on and supported by the platen 105.

The clutch switching device 70 includes: a housing 106; first, second, and third arms 107A, 107B, and 107C; first, second, and third cams 108A, 108B, and 108C; an electric motor M; first, second, and third wire ropes 109A, 109B, and 109C; and an upper cover 110. The first arm 107A, the first cam 108A, and the first wire rope 109A correspond to the harvesting clutch 51. The second arm 107B, the second cam 108B, and the second wire rope 109B correspond to the grain discharging clutch 37. The third arm 107C, the third cam 108C, and the third wire rope 109C correspond to the threshing clutch 40.

The housing 106 is formed of a square box-shaped member having an upper opening, and houses the first, second, and third arms 107A, 107B, and 107C and the first, second, and third cams 108A, 108B, and 108C. The housing 106 includes a bottom 111 and a side wall 112.

A cleaning opening 111a is formed in the bottom portion 111 at a portion (front portion of the bottom portion 111) on the opposite side of the first, second, and third cams 108A, 108B, and 108C from the first, second, and third arms 107A, 107B, and 107C. The cleaning opening 111a is a circular opening. A bottom cover 113 for opening and closing the cleaning opening 111a is provided. The platen 105 is formed at a portion corresponding to the bottom cover 113, and has a notch portion 105a formed so as not to interfere with the bottom cover 113.

The side wall 112 includes: front wall 114, rear wall 115, left side wall 116, and right side wall 117. A fitting portion 118 for fitting the housing 106 to the platen 105 is provided on each of the lateral outer side portion of the left side wall portion 116 and the lateral outer side portion of the right side wall portion 117. The mounting portion 118 is detachably fixed to the platen 105 by a bolt 119. Nuts 120 (weld nuts) for bolts 119 are provided on the back surface of the platen 105.

The first, second, and third arms 107A, 107B, and 107C are swingable around the same swing axis X2 extending in the left-right direction of the machine body, and are arranged in parallel in the direction of the swing axis X2. The first, second, and third arms 107A, 107B, and 107C are relatively rotatably supported by an arm support shaft 121. The arm support shaft 121 is provided so as to straddle wall portions (the left side wall portion 116 and the right side wall portion 117) of the side walls 112 that face each other in the direction of the swing axis X2. Lower ends of the first, second, and third arms 107A, 107B, and 107C are coupled to the arm support shaft 121. The arm support shaft 121 is provided with a stopper 122 for positioning the first, second, and third arms 107A, 107B, and 107C at initial positions (wire drawing positions). The arm support shaft 121 and the stopper 122 are coupled via a support 123. In a side view (see fig. 16), the first, second, and third arms 107A, 107B, and 107C at the wire rope drawing position are in a slightly forward-inclined posture, and thus the stroke S spanning the wire rope drawing position and the wire rope end position can be increased, and the wire rope can be used in a variety of machines.

The first, second, and third arms 107A, 107B, and 107C are each formed of a member having a substantially U-shaped cross section. The upper end portions of the first, second, and third arms 107C protrude upward from the housing 106. A first roller 123A contactable with the first cam 108A is provided at a vertically intermediate portion of the first arm 107A. A second roller 123B contactable with the second cam 108B is provided at a vertically intermediate portion of the second arm 107B. A third roller 123C that can contact the third cam 108C is provided in the vertical middle portion of the third arm 107C.

The end of the first wire rope 109A on the first arm 107A side of the core wire is connected to the upper end of the first arm 107A. An adjustment spring (not shown) is provided at the end of the first wire rope 109A on the reaping clutch 51 side of the core wire, but no adjustment spring is provided between the upper end of the first arm 107A and the end of the first wire rope 109A on the first arm 107A side of the core wire. An end of the second wire rope 109B on the second arm 107B side is connected to an upper end of the second arm 107B. An adjustment spring (not shown) is provided at the end of the core wire of the second wire rope 109B on the side of the grain discharge clutch 37, but no adjustment spring is provided between the upper end of the second arm 107B and the end of the core wire of the second wire rope 109B on the side of the second arm 107B. An end of the third wire rope 109C on the third arm 107C side of the core wire is connected to an upper end of the third arm 107C. An adjusting spring (not shown) is provided at the end of the third wire rope 109C on the threshing clutch 40 side of the core wire, but no adjusting spring is provided between the upper end of the third arm 107C and the end of the third wire rope 109C on the third arm 107C side of the core wire.

The first, second, and third arms 107A, 107B, and 107C are supported by the arm support shaft 121 with the first arm 107A corresponding to the harvest clutch 51 and the third arm 107C corresponding to the threshing clutch 40 sandwiching the second arm 107B corresponding to the grain discharge clutch 37 from both sides in the direction of the swing axis X2. That is, the first arm 107A is supported by a portion of the arm fulcrum 121 closer to the left side wall portion 116 than the second arm 107B, and the third arm 107C is supported by a portion of the arm fulcrum 121 closer to the right side wall portion 117 than the second arm 107B.

Here, normally, the force acting on the first arm 107A when the first wire rope 109A is pulled by the first arm 107A corresponding to the harvest clutch 51, and the force acting on the third arm 107C when the third wire rope 109C is pulled by the third arm 107C corresponding to the threshing clutch 40 are larger than the force acting on the second arm 107B when the second wire rope 109B is pulled by the second arm 107B corresponding to the grain discharge clutch 37. That is, of the first, second, and third arms 107A, 107B, and 107C, the arm that generates a larger force when the first, second, and third cables 109A, 109B, and 109C are pulled is supported by a portion of the arm support shaft 121 that is closer to the left side wall 116 or the right side wall 117.

The first, second, and third cams 108A, 108B, and 108C are rotatable about the same rotation axis X3 extending in the left-right direction of the machine body in parallel with the swing axis X2, and are provided in parallel in the direction of the rotation axis X3 so as to correspond to the first, second, and third arms 107A, 107B, and 107C. The first, second, and third cams 108A, 108B, and 108C are supported by the cam support shaft 124 so as to be relatively non-rotatable. The cam fulcrum 124 is provided so as to straddle the left side wall portion 116 and the right side wall portion 117. The left side wall 116 and the right side wall 117 are provided with bearings 125 that rotatably support the cam support shaft 124. The first, second, and third cams 108A, 108B, and 108C are connected to a cam support shaft 124 via a key 126. A gear portion is formed on an outer peripheral portion of the first cam 108A.

Holes 108Aa, 108Ba, and 108Ca are formed in the first, second, and third cams 108A, 108B, and 108C, respectively. By fitting the first, second, and third cams 108A, 108B, and 108C to the cam support shaft 124 so that the positions of the holes 108Aa, 108Ba, and 108Ca around the rotation axis X3 overlap (in other words, so that the holes 108Aa, 108Ba, and 108Ca overlap when viewed in the direction of the rotation axis X3), it is possible to prevent erroneous fitting of the first, second, and third cams 108A, 108B, and 108C to the cam support shaft 124.

A rotation angle detection sensor 127 is provided for detecting the rotation angle of the first, second, and third cams 108A, 108B, and 108C. A mounting groove 124a to which the rotation angle detecting sensor 127 is mounted is formed at the right end portion of the cam fulcrum 124. The rotation angle detection sensor 127 is supported by the right side wall 117. The right side wall portion 117 is provided with a fitting portion 128 to which the rotation angle detection sensor 127 is fitted.

Here, when the fitting portion 128 is provided on the right side wall portion 117 as described above, the cam support shaft 124 needs to be fitted to the housing 106 with the fitting groove 124a on the right side. If the cam fulcrum 124 is erroneously attached to the housing 106 with the attachment groove 124a on the left side, the rotational angle detection sensor 127 cannot be attached to the cam fulcrum 124, and thus it can be noticed that the cam fulcrum 124 is attached upside down.

The first wire rope 109A couples the first arm 107A and the harvesting clutch 51, and is disposed astride the first arm 107A and the harvesting clutch 51. The first wire 109A extends forward from the upper end of the first arm 107A, and extends forward in the horizontal direction while passing above the first cam 108A. The second wire rope 109B couples the second arm 107B and the grain discharge clutch 37, and is provided so as to straddle the second arm 107B and the grain discharge clutch 37. The second wire 109B extends forward from the upper end of the second arm 107B, and extends forward in the horizontal direction while passing above the second cam 108B. The third wire rope 109C couples the third arm 107C and the threshing clutch 40, and is provided so as to straddle the third arm 107C and the threshing clutch 40. The third wire 109C extends forward from the upper end of the third arm 107C, and extends forward in the horizontal direction while passing above the third cam 108C.

A support portion 129 is provided for supporting the first, second, and third wire ropes 109A, 109B, and 109C. The support portion 129 supports an end portion of the outer wire of the first wire rope 109A on the first arm 107A side, an end portion of the outer wire of the second wire rope 109B on the second arm 107B side, and an end portion of the outer wire of the third wire rope 109C on the third arm 107C side. The support portion 129 is provided on the upper surface of the side portion (the front portion of the side wall 112) of the housing 106 on the side opposite to the side where the first, second, and third arms 107A, 107B, and 107C are located with respect to the first, second, and third cams 108A, 108B, and 108C. The support portion 129 is formed of a substantially L-shaped plate material.

The upper cover 110 opens and closes a portion of the case 106 that opens upward, and is formed of a square box-shaped member that opens downward and forward. The first, second, and third wire ropes 109A, 109B, and 109C pass through portions of the upper cover 110 that are open to the front. The portion of the upper cover 110 that opens forward is closed from the front by the support portion 129. The upper cover 110 is fixed to the left and right side walls 116 and 117 by bolts 130. Engaging protrusions 110a that engage with the corner portions of the support portion 129 are formed on both the left and right sides of the front lower portion of the upper cover 110.

The electric motor M rotationally drives the first, second, and third cams 108A, 108B, and 108C. The output shaft Ma of the electric motor M is provided with a pinion gear 131 that meshes with the gear portion of the first cam 108A. The rotational power of the electric motor M is transmitted from the output shaft Ma to the gear portion of the first cam 108A via the pinion 131, thereby rotationally driving the first, second, and third cams 108A, 108B, and 108C.

The electric motor M is supported by the left side wall 116. The electric motor M is fixed to the left side wall portion 116 by bolts. The relay 132 for the electric motor M is supported by the wall portions (front wall portions 114) of the side walls 112 on the extending direction sides of the first, second, and third wire ropes 109A, 109B, and 109C. The relay 132 is fixed to the front wall portion 114 by bolts. The control device 133 for the cooling fan 11 is supported by a wall portion (the right side wall portion 117) of the side wall 112 that is different from the wall portion on which the relay 132 is supported. The control device 133 is fixed to the right side wall portion 117 by a bolt.

As shown in fig. 18, the control block includes a control device 134 that controls driving of the electric motor M. To the control device 134, there are connected: a position detection sensor 82, a grain discharge operation unit 60, a rotation angle detection sensor 127, and an electric motor M. The control device 134 receives the detection value of the input position detection sensor 82, the clutch switching operation command of the grain discharge operation unit 60, and the detection value of the rotation angle detection sensor 127. The control device 134 controls the driving of the electric motor M based on the detection value of the position detection sensor 82 and the clutch switching operation command of the grain discharge operation unit 60.

Fig. 19 shows the rotational positions (the neutral position N, the first rotational position R1, the second rotational position R2, and the third rotational position R3) of the first, second, and third cams 108A, 108B, and 108C. The first cam 108A corresponding to the harvesting clutch 51 and the third cam 108C corresponding to the threshing clutch 40 are rotationally driven from the neutral position N to one side (front side) about the rotational axis X3, and the second cam 108B corresponding to the grain discharge clutch 37 is rotationally driven from the neutral position N to the other side (rear side) about the rotational axis X3. The first, second, and third cams 108A, 108B, and 108C are rotationally driven by the electric motor M, whereby the first, second, and third arms 107A, 107B, and 107C swing rearward around the swing axis X2 by the action of the first, second, and third cams 108A, 108B, and 108C (the cam action on the first, second, and third rollers 123A, 123B, and 123C), respectively, and the first, second, and third arms 107A, 107B, and 107C pull the first, second, and third wire ropes 109A, 109B, and 109C, respectively, thereby switching the harvesting clutch 51, the threshing clutch 40, and the grain discharging clutch 37 between the on state and the off state at an appropriate timing.

Specifically, as shown in fig. 20, in the neutral position N, the first, second, and third cams 108A, 108B, and 108C do not cam the first, second, and third arms 107A, 107B, and 107C, respectively. Therefore, the harvest clutch 51, the grain discharge clutch 37, and the threshing clutch 40 are in the disengaged state.

In the first rotational position R1, the third cam 108C cams the third arm 107C, and the first and second cams 108A, 108B do not cam the first and second arms 107A, 107B, respectively. Therefore, the threshing clutch 40 is in the on state, and the harvesting clutch 51 and the grain discharging clutch 37 are in the off state.

In the second rotational position R2, the first and third cams 108A, 108C respectively cam the first and third arms 107A, 107C, and the second cam 108B does not cam the second arm 107B. Therefore, the harvesting clutch 51 and the threshing clutch 40 are in the on state, and the grain discharging clutch 37 is in the off state.

In the third rotational position R3, the second cam 108B cams the second arm 107B, and the first and third cams 108A, 108C do not cam the first and third arms 107A, 107C, respectively. Therefore, the grain discharging clutch 37 is in the on state, and the harvesting clutch 51 and the threshing clutch 40 are in the off state.

[ other embodiments ]

(1) In the above embodiment, the exhaust pipe 69 is drawn out leftward from the rear portion of the left side surface in the outer peripheral portion of the exhaust gas purification apparatus 10 and extends rearward and upward. However, the exhaust pipe 69 may be drawn out from the right side surface, the upper surface, the lower surface, the front surface, and the rear surface in the outer peripheral portion of the exhaust purification apparatus 10 and extend upward. For example, as shown in fig. 21 and 22, the exhaust pipe 69 may be drawn upward from the rear portion of the upper surface in the outer peripheral portion of the exhaust purification apparatus 10 and extend upward and rearward.

(2) In the above embodiment, the swing support portion 96 is mounted on and supported by the upper surface portion of the top plate 67. However, as shown in fig. 21 to 24, the swing support portion 96 may be supported by being suspended from the lower surface of the upper surface portion of the side panel 59. The guide 102 is formed on the upper surface of the side plate 59. The swing support 96 includes a first support plate member 137 and a second support plate member 138. The first support plate 137 and the second support plate 138 are formed of substantially L-shaped plates. The first support plate 137 is fixed to the lower surface of the upper surface of the side panel 59. The second supporting plate member 138 is fixed to the second supporting plate member 138 by a bolt 139 from the left side in a state of being overlapped with the first supporting plate member 137 from the left side. A mounting portion 101 to which the position detection sensor 82 is mounted is provided on the left side portion of the second supporting plate member 138.

The exhaust gas purification device 10 is located rearward and downward with respect to the position detection sensor 82. A partition wall 140 that vertically partitions the space between the exhaust gas purification apparatus 10 and the position detection sensor 82 is provided between the exhaust gas purification apparatus 10 and the position detection sensor 82. The partition wall 140 straddles left and right ones of the side panels 59. The partition wall 140 includes a bottom portion 141 that covers the position detection sensor 82 from below and a rear wall portion 142 that covers the position detection sensor 82 from behind. An upper front pillar 143 and a lower front pillar 144 are provided to support the front of the side panel 59. The bottom portion 141 is provided so as to straddle the upper front pillar 143 and the lower end portion of the rear wall portion 142. The upper front pillar 143 is provided with a support 145 to which the front end of the bottom 141 is bolted. The rear end portion of the bottom portion 141 is fixed to the lower end portion of the rear wall portion 142 by a bolt. The rear wall portion 142 is suspended and supported from the lower surface of the upper surface portion of the side panel 59.

(3) In the above embodiment, the exhaust gas purification device 10 is provided in a state of protruding to the left side from the left end 59a of the side plate 59. However, the exhaust gas purification device 10 may be provided so as not to protrude to the left of the left end 59a of the side plate 59. In this case, the raised portion 84b may not be formed in the cover 84.

(4) In the above embodiment, the cover 84 is configured to be detachable. However, the cover 84 may be configured to be non-detachable.

(5) In the above embodiment, the clutch switching lever 81 is provided behind the main shift lever 79. However, the clutch switching lever 81 may be provided rearward of the sub-shift lever 80.

(6) In the above embodiment, the clutch switch lever 81 is configured to: after the operation of disengaging the handle-side lever 92 from the entry portion 102b against the biasing force of the spring as the preliminary operation is performed, the operation can be performed to swing back and forth along the linear portion 102 a. However, a push-operated switch (not shown) may be provided at the grip portion of the clutch switching lever 81, and the clutch switching lever 81 may be configured to be able to be operated by being swung after being pressed by the switch as a preliminary operation. Further, the clutch switching lever 81 may also be configured to be able to be operated by being swung even if the preparatory operation is not performed.

(7) In the above embodiment, the clutch switching device 70 is provided between the primary auger 29 and the secondary auger 30 in the front-rear direction of the machine body. However, the clutch switching device 70 may be provided on the rear side of the secondary screw conveyor 30.

(8) In the above embodiment, the clutch switching device 70 is provided below the downwardly tapered portion 15a of the grain storage box 15 (in other words, in a state of overlapping with the grain storage box 15 in a plan view). However, the clutch switching device 70 may be provided so as not to overlap the grain storage box 15 in a plan view.

(9) In the above embodiment, the fuel tank 16 is provided between the threshing device 13 and the grain storage box 15 at the rear of the clutch switching device 70. However, a fuel tank 16 may be provided between the threshing device 13 and the grain storage box 15 in front of the clutch switching device 70.

(10) In the above embodiment, the platen 105 is provided at the intersection where the main frame 1A and the lateral frame 1B intersect, and the clutch switching device 70 is detachably mounted on and supported by the platen 105. However, the clutch switching device 70 may be supported by the intersection portion so as not to provide the platen 105. The clutch switching device 70 may be supported only by the main frame 1A.

(11) In the above embodiment, the housing 106 is opened upward, and the upper cover 110 for opening and closing the portion of the housing 106 opened upward is provided. However, the housing 106 may not be opened upward, and the upper cover 110 may not be provided.

(12) In the above embodiment, the first arm 107A is supported by a portion of the arm support shaft 121 closer to the left side wall portion 116 than the second arm 107B, and the third arm 107C is supported by a portion of the arm support shaft 121 closer to the right side wall portion 117 than the second arm 107B. However, the left and right positions of the first arm 107A and the third arm 107C may be reversed. The second arm 107B may be supported by a portion of the arm support shaft 121 close to the left side wall 116 or the right side wall 117.

(13) In the above embodiment, the relay 132 for the electric motor M is supported by the front wall portion 114 of the side wall 112. However, the relay 132 may be supported by a wall portion other than the front wall portion 114 of the side wall 112. The relay 132 may not be supported by the side wall 112.

(14) In the above embodiment, the control device 133 for the cooling fan 11 is supported by the right side wall portion 117 of the side wall 112. However, the controller 133 may be supported by a wall portion of the side wall 112 other than the right side wall portion 117. Further, the control device 133 may not be supported by the side wall 112.

(15) In the above embodiment, the electric motor M is supported by the left side wall portion 116 of the side wall 112, and the rotation angle detection sensor 127 is supported by the right side wall portion 117 of the side wall 112. However, the electric motor M may be supported by the right side wall portion 117 of the side wall 112, and the rotation angle detection sensor 127 may be supported by the left side wall portion 116 of the side wall 112.

(16) In the above embodiment, the clutch switching device 70 controls the harvesting clutch 51, the threshing clutch 40, and the grain discharging clutch 37. However, the control target of the clutch switching device 70 is not limited to the control target of the above embodiment. For example, when the control target of the clutch switching device 70 is increased, since there is a margin in the left-right width of the housing 106, the cam can be increased in the direction of the rotation axis X3. The clutch switching device 70 is an operation state switching device that switches the operation states of a plurality of operation devices (the harvesting clutch 51, the threshing clutch 40, and the grain discharge clutch 37 in the above embodiment) at appropriate timings, but the control target of the operation state switching device may be a clutch or a transmission other than the clutch in the above embodiment.

Industrial applicability of the invention

The invention can be used for not only a common combine harvester, but also a semi-feeding combine harvester.

Description of the reference numerals

1: a machine body frame; 1A: a main frame; 1B: a transverse frame; 3: a harvesting part; 8: a driving section; 10: an exhaust gas purification device; 13: a threshing device; 15: a grain storage box (grain storage part, grain storage box); 15 a: a downwardly narrowing shape portion; 16: a fuel tank; 17: a grain discharge device; 20: a main transmission; 29: a primary screw conveyor; 30: a secondary screw conveyor; 31: a longitudinal conveying device; 32: a secondary loopback device; 37: grain discharge clutch; 40: a threshing clutch; 51: a harvesting clutch; 57: a driving seat; 59: a side panel; 67: a top plate (partition wall); 69: an exhaust pipe; 70: clutch switching means (operating state switching means); 79: a main gear lever; 80: a sub-gear shift lever; 81: a clutch switching lever; 82: a position detection sensor; 96: a swing support portion; 102: a guide section; 102 a: a straight portion; 102 b: an entry section; 105: a platen; 106: a housing; 107A: a first arm; 107B: a second arm; 107C: a third arm; 108A: a first cam; 108B: a second cam; 108C: a third cam; 109A: a first wire rope (a harvesting wire rope); 109B: a second wire rope; 109C: a third wire rope (threshing wire rope); 110: an upper cover; 111: a bottom; 111 a: a cleaning port; 112: a side wall; 113: a bottom cover; 118: an assembling portion; 121: an arm fulcrum (fulcrum); 127: a rotation angle detection sensor; 129: a support portion; 132: a relay; 133: a control device; 140: a partition wall; 141: a bottom; 142: a rear wall portion; e: an engine; ER: an engine room; l1: a protrusion length; l2: a protrusion length; m: an electric motor (drive actuator); o1: a first operating position; o2: a second operating position; o3: a third operating position; x2: swinging the axis; x3: the axis of rotation.

Claims (34)

1. A combine harvester is provided with:

a harvesting part for harvesting the vertical grain stalks;

a threshing device for threshing the harvested rice straw; and

a grain storage part which is arranged in parallel with the threshing device in a transverse direction and stores grains after threshing treatment,

the combine is characterized by comprising:

a longitudinal conveying device which is provided at a lateral side portion of the threshing device on the grain storage portion side and conveys grains subjected to threshing processing upward toward the grain storage portion; and

an operating state switching device for switching operating states of the plurality of operating devices at appropriate timings,

the working state switching device is arranged between the threshing device and the grain storage part and is closer to the rear side than the longitudinal conveying device.

2. A combine harvester according to claim 1,

the lower part of the threshing device is provided with the following components at intervals along the front and back direction of the machine body: a primary screw conveyor for conveying grains of a primary material to the grain storage portion side in a left-right direction of the body; and a secondary screw conveyor for conveying grains of the secondary product to the grain storage portion side in the left-right direction of the body,

the primary screw conveyor and the secondary screw conveyor are respectively configured to be detachable from a lateral side portion of the grain storage portion side in the threshing device,

the working state switching device is arranged between the primary screw conveyor and the secondary screw conveyor in the front-rear direction of the machine body.

3. A combine harvester according to claim 2,

the grain storage part is a grain storage box,

a secondary returning device is arranged at the lateral side part of the grain storage part side of the threshing device and returns grains of secondary objects from the secondary screw conveyor to the front part of the threshing device,

the working state switching device is arranged below the downward narrowing shape part in the grain storage box.

4. A combine harvester according to any one of claims 1-3,

a fuel tank is arranged between the threshing device and the grain storage part behind the working state switching device.

5. A combine harvester according to any one of claims 1-4,

the working state switching device is supported by a main frame extending along the front and back directions of the machine body in the machine body frame.

6. A combine harvester according to claim 5,

the machine body frame is provided with a transverse frame which extends along the left and right directions of the machine body in a state of crossing the main frame,

the operating state switching device is supported at an intersection where the main frame and the cross frame intersect.

7. A combine harvester according to claim 6,

a bedplate is arranged at the crossing part,

the operating state switching device is detachably mounted on and supported by the platen.

8. A combine harvester according to any one of claims 1-7,

the working device is provided with: a harvesting clutch which switches on/off power transmission to the harvesting part; and a threshing clutch which switches on/off power transmission to the threshing device,

the operating state switching device includes: a harvest wire rope coupled to the harvest clutch; and a threshing wire rope connected to the threshing clutch,

the harvesting wire rope and the threshing wire rope extend from the working state switching device towards the front.

9. A combine harvester according to any one of claims 1 to 8, comprising:

a driving part having a driving seat and a side panel provided on one side of the driving seat in the left-right direction of the machine body; and

an engine room provided below the driver's seat and accommodating an engine and an exhaust gas purification device for purifying exhaust gas of the engine,

the exhaust purification device is arranged below the side panel.

10. A combine harvester according to claim 9,

the working device is provided with: a harvesting clutch which switches on/off power transmission to the harvesting part; and a threshing clutch which switches on/off power transmission to the threshing device,

the combine harvester is provided with a clutch switching lever for switching the harvesting clutch and/or the threshing clutch between an on state and an off state,

the clutch switching rod is arranged on the side panel,

the exhaust purification device is arranged below the clutch switching rod.

11. A combine harvester according to any one of claims 1-10,

an exhaust pipe for discharging exhaust gas purified by an exhaust gas purification device,

the exhaust pipe is arranged between the threshing device and the grain storage part in a mode of passing through the upper part of the working state switching device.

12. A combine harvester is provided with:

a driving part having a driving seat and a side panel provided on one side of the driving seat in the left-right direction of the machine body;

an engine room provided below the driver's seat and accommodating an engine and an exhaust gas purification device for purifying exhaust gas of the engine;

a harvesting part which is arranged in front of the driving part and harvests and plants the vertical grain stalks; and

a threshing device which is arranged at the rear part of the harvesting part and is used for threshing the harvested rice straws,

the combine is characterized by comprising:

a harvesting clutch which switches on/off power transmission to the harvesting part;

a threshing clutch which switches on/off power transmission to the threshing device;

a single clutch switching lever that switches between an on state and an off state of both the harvesting clutch and the threshing clutch; and

a position detection sensor that detects an operation position of the clutch switching lever,

the clutch switching lever is provided on the side panel and is capable of changing positions to a first operating position, a second operating position, and a third operating position, the first operating position being an operating position at which both the harvesting clutch and the threshing clutch are in a connected state; the second operating position is an operating position in which the harvesting clutch is in an off state and the threshing clutch is in an on state; the third operating position is an operating position in which both the harvesting clutch and the threshing clutch are in a cut-off state,

the exhaust purification device is arranged below the side panel,

the position detection sensor is arranged below the side panel and above the exhaust purification device,

a partition wall for vertically partitioning the space between the exhaust gas purification device and the position detection sensor is provided between the exhaust gas purification device and the position detection sensor.

13. A combine harvester according to claim 12,

the clutch switching lever is a swing-operated lever,

a swing support portion for supporting the clutch switching lever in a swingable manner is mounted and supported on an upper surface portion of the partition wall,

the position detection sensor is supported by the swing support portion.

14. A combine harvester according to claim 12,

the clutch switching lever is a swing-operated lever,

a swing support part for supporting the clutch switching lever in a swinging manner is hung and supported on the lower surface of the upper surface part of the side plate,

the position detection sensor is supported by the swing support portion.

15. A combine harvester according to claim 14,

the exhaust gas purification device is located rearward and downward with respect to the position detection sensor,

the partition wall has: a bottom portion covering the position detection sensor from below; and a rear wall portion covering the position detection sensor from behind.

16. A combine harvester according to any one of claims 12 to 15,

the partition wall spans left and right ones of the side panels.

17. A combine harvester according to any one of claims 12 to 16,

a main shift lever of a forward-backward swing operation type for performing a shift operation of the main shift device and an auxiliary shift lever of a forward-backward swing operation type for performing a shift operation of the auxiliary shift device are provided in the side panels so as to be laterally juxtaposed,

the main shift lever is configured to: is located on the opposite side of the driver seat in the body right-left direction with respect to the sub-shift lever, and a protruding length of a portion of the main shift lever protruding from an upper surface of the side panel is longer than a protruding length of a portion of the sub-shift lever protruding from an upper surface of the side panel,

the clutch switching rod is arranged behind the main speed changing rod.

18. A combine harvester according to any one of claims 12 to 17,

the clutch switching lever is a swing operation type lever and is configured to be capable of being swing-operated after being subjected to a preparatory operation.

19. A combine harvester according to claim 18,

a guide portion that guides the clutch switching lever,

the guide portion has: a linear portion extending linearly in a swing operation direction of the clutch switching lever; and an entering portion having a shape entering in a direction intersecting with a swing operation direction of the clutch switching lever in a state of being continuous with the linear portion,

the entry portion is provided at a position corresponding to the first operation position, a position corresponding to the second operation position, and a position corresponding to the third operation position, respectively,

the combine harvester is provided with a force application component which applies force to the clutch switching rod to one side entering the entering part,

the clutch switch lever is configured to: the clutch switching lever is configured to be capable of being operated to swing along the linear portion after being operated to disengage the clutch switching lever from the entry portion against the biasing force of the biasing member as the preliminary operation.

20. A combine harvester according to claim 19,

a swing support portion for supporting the clutch switching lever in a swingable manner is mounted and supported on an upper surface portion of the partition wall,

the guide portion is provided above the swing support portion.

21. A combine harvester according to claim 19,

the guide portion is formed on the upper surface portion of the side panel.

22. A combine harvester according to any one of claims 18 to 21,

a press-operated switch is provided on the grip portion of the clutch switching lever,

the clutch switch lever is configured to: the operation can be performed by a swing operation after the pressing operation of the switch as the preliminary operation is performed.

23. A combine harvester is provided with a working state switching device for switching the working states of a plurality of working devices at proper time,

the operating state switching device includes: a plurality of arms which can swing around the same swing axis and are arranged in parallel in the direction of the swing axis; a plurality of cams that are rotatable about the same rotation axis parallel to the swing axis and are provided in parallel in the direction of the rotation axis so as to correspond to the plurality of arms, respectively; a drive actuator that rotationally drives the plurality of cams; and a plurality of wire ropes respectively coupling the plurality of arms and the plurality of working devices and respectively extending from the plurality of arms toward the same direction,

the plurality of cams are rotationally driven by the drive actuator, whereby the plurality of arms are swung on the same side around the swing axial center by the action of the cams, and the plurality of arms pull the plurality of wire ropes, whereby the operating states of the plurality of operating devices are switched at appropriate timings.

24. A combine harvester according to claim 23,

the operating state switching device has a housing that accommodates the plurality of arms and the plurality of cams,

upper end portions of the plurality of arms protrude upward from the housing, and the wire ropes are connected to upper end portions of the arms,

the plurality of wire ropes extend in the horizontal direction while passing above the cam.

25. A combine harvester according to claim 24,

and a supporting part for supporting the steel wire rope is arranged on the side part of the shell opposite to the side where the cam and the arm are located.

26. A combine harvester according to claim 24 or 25,

the housing has a bottom and a side wall that covers the plurality of arms and the plurality of cams from the front, the rear, the left, and the right, and is opened upward,

the electronic device is provided with an upper cover which opens and closes a part of the housing which opens upward.

27. A combine harvester according to claim 26,

a cleaning opening is formed in a portion of the bottom portion opposite to the side where the arm is located,

the combine harvester is provided with: and a bottom cover for opening and closing the cleaning opening.

28. A combine harvester according to any one of claims 26 or 27,

a support shaft that spans wall portions of the side walls that face each other in the swing axial center direction and supports the plurality of arms so as to be swingable around the swing axial center is provided,

among the plurality of arms, the arm that exerts a larger force when the wire rope is pulled is supported by a portion of the fulcrum that is closer to the wall portion.

29. A combine harvester according to any one of claims 26 to 28,

the side wall portion of the side wall on the side of the wire rope in the extending direction supports the relay for the drive actuator.

30. A combine harvester according to claim 29,

a control device for a device different from the operating state switching device is supported by a wall portion of the side wall different from the wall portion supporting the relay.

31. A combine harvester according to any one of claims 26 to 30,

a rotation angle detection sensor that detects a rotation angle of the cam,

the drive actuator is supported by a wall portion on one side of the side wall in the direction of the rotational axis center, and the rotation angle detection sensor is supported by a wall portion on the other side of the side wall in the direction of the rotational axis center.

32. A combine harvester according to any one of claims 26 to 31,

an assembling portion for assembling the housing to the body is provided on an outer side portion of the housing.

33. A combine harvester according to any one of claims 23 to 32, comprising:

a harvesting part for harvesting the vertical grain stalks;

a threshing device for threshing the harvested rice straw;

a grain storage box for storing the threshed grains; and

a grain discharging device for discharging the grains in the grain storage box,

the working device is provided with: a harvesting clutch which switches on/off power transmission to the harvesting part; a threshing clutch which switches on/off power transmission to the threshing device; and a grain discharging clutch for connecting/disconnecting the power transmission to the grain discharging device,

the cam corresponding to the harvesting clutch and the cam corresponding to the threshing clutch among the plurality of cams are rotationally driven to one side around the rotational axis, and the cam corresponding to the grain discharging clutch among the plurality of cams is rotationally driven to the other side around the rotational axis.

34. A combine harvester according to claim 33,

the operating state switching device has a housing that accommodates the plurality of arms and the plurality of cams,

the housing has: a bottom; and a side wall covering the plurality of arms and the plurality of cams from the front, the rear, the left, and the right,

the combine harvester is provided with a support shaft which straddles wall portions of the side walls which are opposed to each other in the swing shaft center direction and supports the plurality of arms so as to be swingable around the swing shaft center,

the plurality of arms are supported by the support shaft in a state in which: an arm corresponding to the harvesting clutch and an arm corresponding to the threshing clutch of the plurality of arms sandwich an arm corresponding to the grain discharging clutch of the plurality of arms from both sides in the direction of the swing shaft center.

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