Combine harvester

Abstract

A combine harvester includes a driver's section having a driver's seat and a side panel, an engine room disposed below the driver's section and housing an engine and an exhaust purification device, a harvesting section disposed in front of the driver's section and harvesting standing grain, and a threshing device disposed behind the harvesting section and performing a threshing process on the harvested grain. The combine harvester includes a harvesting clutch that connects / disconnects power transmission to the harvesting section, a threshing clutch that connects / disconnects power transmission to the threshing device, a single clutch switching lever that performs switching operation of both the harvesting clutch and the threshing clutch to a connected state and a disconnected state, and a position detection sensor that detects an operation position of the clutch switching lever. A partition wall that separates the exhaust purification device and the position detection sensor vertically is disposed between the exhaust purification device and the position detection sensor.

Description

[0001] This application is a divisional application of the following application:

[0002] International Application Date: February 8, 2019 International Application No.: PCT / JP2019 / 004569

[0003] National Application No.: 201980011424.9 TECHNICAL FIELD

[0004] The present application relates to a combine harvester. BACKGROUND [1]

[0006] In the past, as a combine harvester, for example, a combine harvester described in Patent Literature 1 is known. In Patent Literature 1, a combine harvester is disclosed which is provided with: a harvesting portion (in the document, "harvesting conveyor [3]") which harvests standing grain; a threshing device (in the document, "threshing device [4]") which performs a threshing process on the harvested grain; a grain storage portion (in the document, "grain storage device [5]") which is provided in a manner laterally juxtaposed with the threshing device and stores the threshed grain; and a working state switching device (in the document, "clutch operating device [A]") which switches the working state of a plurality of working devices at an appropriate timing. [2]

[0008] In the past, as a combine harvester, for example, a combine harvester described in Patent Literature 2 is known. In Patent Literature 2, a combine harvester is disclosed which is provided with: a driver portion (in the document, "driver portion

[18] ") which has a driver seat (in the document, "driver seat

[30] ") and a side panel (in the document, "operation unit [U]") which is provided on one side in the left-right direction of the machine body with respect to the driver seat; an engine room (in the document, "engine room [R]") which is provided below the driver portion and accommodates an engine (in the document, "engine [E]") and an exhaust purification device (in the document, "exhaust treatment device

[41] ") which performs a purification process on the exhaust of the engine; a harvesting portion (in the document, "harvesting conveyor

[14] ") which is provided in front of the driver portion and harvests standing grain; and a threshing device (in the document, "threshing device

[15] ") which is provided behind the harvesting portion and performs a threshing process on the harvested grain, wherein the combine harvester is provided with: a harvesting clutch which connects / disconnects the power transmission to the harvesting portion; a threshing clutch which connects / disconnects the power transmission to the threshing device; and a single clutch switching lever (in the document, "clutch lever

[36] ") which performs a switching operation to the on state and the off state for both the harvesting clutch and the threshing clutch. [3]

[0010] In the past, as a combine harvester, for example, the one described in Patent Literature 1 is known. In Patent Literature 1, a combine harvester is disclosed which is provided with a work state switching device (in the document, "clutch operating device [A]") which switches the work state of a plurality of work devices at an appropriate timing. In the work state switching device of Patent Literature 1, there are provided: a plurality of arms (in the document, "cam followers

[85] " and the like) which are able to swing about a first swing axis (in the document, "axis of the pivot support shaft

[78] ") and are disposed in a state of being juxtaposed in the direction of the first swing axis, a plurality of arms (in the document, "cam followers

[84] " and the like) which are able to swing about a second swing axis (in the document, "axis of the pivot support shaft

[77] ") and are disposed in a state of being juxtaposed in the direction of the second swing axis, a plurality of cams (in the document, "first to third cam plates

[81] ,

[82] ,

[83] ") which are able to rotate about the same rotation axis (in the document, "axis of the cam shaft

[80] ") that is parallel to the first and second swing axes and are disposed in a state of being juxtaposed in the direction of the rotation axis, a drive actuator (in the document, "electric motor

[70] ") which rotationally drives the plurality of cams, a plurality of steel wires (in the document, "operation ropes [40a]" and the like) which are coupled to the arms on the first swing axis side and the work devices and extend from each of the arms on the first swing axis side, and a plurality of steel wires (in the document, "operation ropes [5a]" and the like) which are coupled to the arms on the second swing axis side and the work devices and extend from each of the arms on the second swing axis side.

[0011] Prior Art Documents

[0012] Patent Literature

[0013] Patent Literature 1: Japanese Patent Application Publication No. 2009-268365

[0014] Patent Literature 2: Japanese Patent Application Publication No. 2015-130810 SUMMARY

[0015] PROBLEMS TO BE SOLVED BY THE INVENTION [1]

[0017] The technical problem corresponding to Background Art [1] is as follows.

[0018] In the combine harvester described in Patent Literature 1, the work state switching device is provided between the threshing device and the grain storage portion. However, in the combine harvester described in Patent Literature 1, the space available at the site where the work state switching device is provided is small, and there is room for improvement in terms of easily disposing the work state switching device.

[0019] In view of the above circumstances, a combine harvester in which the work state switching device is easily disposed is desired. [2]

[0021] The technical problem corresponding to the background art [2] is as follows.

[0022] In the combine harvester described in Patent Literature 2, when a position detection sensor is provided to the base of the clutch switching lever in order to detect the operation position of the clutch switching lever, the position detection sensor is located in the vicinity of the exhaust purification device. In this case, there is a concern that the position detection sensor is affected by the hot gas of the exhaust purification device, resulting in the occurrence of a bad condition.

[0023] In view of the above circumstances, a combine harvester in which a position detection sensor that detects the operation position of a clutch switching lever is less likely to be affected by the hot gas of an exhaust purification device is desired. [3]

[0025] The technical problem corresponding to the background art [3] is as follows.

[0026] The work state switching device of Patent Literature 1 has a plurality of arms on the first swing axis center side and a plurality of arms on the second swing axis center side, and on this basis, a steel wire is extended from each of the plurality of arms on the first swing axis center side, and a steel wire is extended from each of the plurality of arms on the second swing axis center side. Therefore, the number of components constituting the work state switching device increases. In addition, the plurality of steel wires on the first swing axis center side and the plurality of steel wires on the second swing axis center side are intertwined.

[0027] In view of the above circumstances, a combine harvester in which a work state switching device can be easily constituted is desired.

[0028] Solution to the problem [1]

[0030] The solution corresponding to the technical problem [1] is as follows.

[0031] The present application is a combine harvester that has: a harvesting portion that harvests standing grain; a threshing device that performs a threshing process on the harvested grain; and a grain storage portion that is provided in a manner in which it is laterally juxtaposed with the threshing device and stores the threshed grain, wherein the combine harvester has: a vertical conveying device that is provided to a lateral portion of the threshing device on the grain storage portion side and conveys the threshed grain upward toward the grain storage portion; and a work state switching device that switches the work state of a plurality of work devices at an appropriate timing, the work state switching device being provided between the threshing device and the grain storage portion on a rear side than the vertical conveying device.

[0032] There is a relatively large amount of spare space on the rear side than the vertical conveying device between the threshing device and the grain storage portion. According to this feature, the work state switching device can be easily disposed using this space.

[0033] Further, in the present application, it is preferable that a primary spiral conveyor that conveys primary material of the grains to the grain storage portion in the left-right direction of the machine body and a secondary spiral conveyor that conveys secondary material of the grains to the grain storage portion in the left-right direction of the machine body be provided at intervals in the front-rear direction of the machine body in the lower portion of the threshing device, the primary spiral conveyor and the secondary spiral conveyor each being configured to be able to be removed from the lateral portion of the grain storage portion side of the threshing device, and the operation state switching device be provided between the primary spiral conveyor and the secondary spiral conveyor in the front-rear direction of the machine body.

[0034] According to this feature, the primary spiral conveyor and the secondary spiral conveyor can be removed in a manner that does not easily cause interference with the operation state switching device.

[0035] Further, in the present application, it is preferable that the grain storage portion be a grain storage tank, a secondary return device that returns secondary material of the grains from the secondary spiral conveyor to the front portion of the threshing device be provided in the lateral portion of the grain storage portion side of the threshing device, and the operation state switching device be provided below the downwardly-narrowing shape portion in the grain storage tank.

[0036] According to this feature, the operation state switching device can be easily provided using the space (dead space) below the downwardly-narrowing shape portion in the grain storage tank.

[0037] Further, in the present application, it is preferable that a fuel tank be provided behind the operation state switching device between the threshing device and the grain storage portion.

[0038] According to this feature, the fuel tank can be easily provided using the space behind the operation state switching device.

[0039] Further, in the present application, it is preferable that the operation state switching device be supported by a main frame that extends in the front-rear direction of the machine body in the machine body frame.

[0040] According to this feature, the main frame can be used as a member that supports the operation state switching device, and the operation state switching device can be securely supported.

[0041] Further, in the present application, it is preferable that the machine body frame have a lateral frame that extends in the left-right direction of the machine body in a state of intersecting the main frame, and the operation state switching device be supported at an intersection portion of the main frame and the lateral frame.

[0042] According to this feature, if it is the intersection portion of the main frame and the lateral frame, the configuration that supports the operation state switching device can be made more secure.

[0043] Further, in the present application, it is preferable that a table board be provided at the intersection, and the working state switching device be detachably placed and supported on the table board.

[0044] According to this feature, the working state switching device can be more firmly supported by the placement surface. Further, by detaching the working state switching device, maintenance of the working state switching device can be more easily performed.

[0045] Further, in the present application, it is preferable that the working device include a harvesting clutch that switches on / off of power transmission to the harvesting section, and a threshing clutch that switches on / off of power transmission to the threshing device, and the working state switching device include a harvesting wire rope coupled to the harvesting clutch, and a threshing wire rope coupled to the threshing clutch, the harvesting wire rope and the threshing wire rope extending forward from the working state switching device.

[0046] According to this feature, the harvesting wire rope and the threshing wire rope easily pass between the threshing device and the grain storage section.

[0047] Further, in the present application, it is preferable that a driving section having a driver seat and a side panel provided on one side of the driver seat in a left-right direction of a machine body, and an engine room provided below the driving section and accommodating an engine and an exhaust purification device that purifies exhaust of the engine, the exhaust purification device being provided below the side panel.

[0048] According to this feature, the exhaust purification device can be easily arranged using a space below the side panel.

[0049] Further, in the present application, it is preferable that the working device include a harvesting clutch that switches on / off of power transmission to the harvesting section, and a threshing clutch that switches on / off of power transmission to the threshing device, and the combine harvester include a clutch switching lever that performs switching operation of both or one of the harvesting clutch and the threshing clutch to an on state and an off state, the clutch switching lever being provided on the side panel, and the exhaust purification device being provided below the clutch switching lever.

[0050] According to this feature, the operation member for the harvesting clutch and the operation member for the threshing clutch can be made common by the clutch switching lever. Further, the exhaust purification device can be easily arranged using a space below the clutch switching lever.

[0051] Further, in the present application, it is preferable to provide an exhaust pipe that exhausts exhaust gas that has been subjected to purification treatment by an exhaust purification device, the exhaust pipe being provided between the threshing device and the grain storage portion in a manner that passes above the operating state switching device.

[0052] According to the present feature, the space above the operating state switching device can be used to easily provide the exhaust pipe. [2]

[0054] The solution corresponding to technical problem [2] is as follows.

[0055] The present application is a combine harvester that includes a driver section having a driver seat and a side panel provided on one side of the driver seat in a vehicle body left-right direction, an engine room provided below the driver section and accommodating an engine and an exhaust purification device that purifies exhaust gas of the engine, a harvesting section provided in front of the driver section and harvesting standing grain, and a threshing device provided behind the harvesting section and performing a threshing process on the harvested grain, wherein the combine harvester includes a harvesting clutch that connects / disconnects power transmission to the harvesting section, a threshing clutch that connects / disconnects power transmission to the threshing device, a single clutch switching lever that performs switching operation of both the harvesting clutch and the threshing clutch to a connected state and a disconnected state, and a position detection sensor that detects an operation position of the clutch switching lever, the clutch switching lever is provided to the side panel and can be changed in position to a first operation position in which both the harvesting clutch and the threshing clutch are in the connected state, a second operation position in which the harvesting clutch is in the disconnected state and the threshing clutch is in the connected state, and a third operation position in which both the harvesting clutch and the threshing clutch are in the disconnected state, the exhaust purification device is provided below the side panel, the position detection sensor is provided below the side panel and above the exhaust purification device, and a partition wall that separates the exhaust purification device and the position detection sensor vertically is provided between the exhaust purification device and the position detection sensor.

[0056] According to the present feature, the exhaust purification device and the position detection sensor are separated vertically by the partition wall, and therefore, hot air from the exhaust purification device toward the position detection sensor is blocked by the partition wall. Thus, the position detection sensor is less likely to be affected by the hot air from the exhaust purification device.

[0057] Moreover, in the present application, it is preferable that the clutch switching lever be a lever of a swing operation type, that a swing support portion that supports the clutch switching lever in a swingable manner be supported on an upper surface portion of the partition wall, and that the position detection sensor be supported on the swing support portion.

[0058] According to the present feature, the partition wall can be used as a member that supports the swing support portion. Furthermore, the swing support portion can be used as a member that supports 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 operation position of the clutch switching lever about the swing axis can be detected with high precision by the position detection sensor.

[0059] Moreover, in the present application, it is preferable that the clutch switching lever be a lever of a swing operation type, that a swing support portion that supports the clutch switching lever in a swingable manner be supported on a lower surface of an upper surface portion of the side panel, and that the position detection sensor be supported on the swing support portion.

[0060] According to the present feature, the side panel can be used as a member that supports the swing support portion. Furthermore, the swing support portion can be used as a member that supports 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 operation position of the clutch switching lever about the swing axis can be detected with high precision by the position detection sensor.

[0061] Moreover, in the present application, it is preferable that the exhaust purification device be located below and behind the position detection sensor, that the partition wall have a bottom portion that covers the position detection sensor from below and a rear wall portion that covers the position detection sensor from behind.

[0062] According to the present feature, the position detection sensor is less likely to be affected by the hot gas of the exhaust purification device than when the exhaust purification device is located directly above the position detection sensor. Furthermore, the hot gas of the exhaust purification device that goes toward the position detection sensor from below and from behind can be blocked by the bottom portion and the rear wall portion.

[0063] Moreover, in the present application, it is preferable that the partition wall span a left side portion and a right side portion in the side panel.

[0064] According to the present feature, the hot gas of the exhaust purification device that goes toward the position detection sensor can be blocked by the partition wall over a wide range that spans the left and right widths of the side panel.

[0065] Further, in the present application, it is preferable that the side panel is provided with a front-rear swing operation type main shift lever for performing a shift operation on a main shift device and a front-rear swing operation type sub shift lever for performing a shift operation on a sub shift device in a lateral side-by-side manner, the main shift lever is disposed on the opposite side of the driver's seat in the vehicle left-right direction with respect to the sub shift lever, and a protruding length of a portion of the main shift lever that protrudes from an upper surface of the side panel is longer than a protruding length of a portion of the sub shift lever that protrudes from the upper surface of the side panel, and the clutch switching lever is disposed behind the main shift lever.

[0066] According to the present feature, 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 driver's elbow that holds the main shift lever is higher than the height position of the driver's elbow that holds the sub shift lever. In this case, assuming that the clutch switching lever is disposed behind the sub shift lever in the case where the driver holds the sub shift lever and performs a front-rear swing operation, the height position of the driver's elbow that holds the sub shift lever is low, and the driver's elbow easily hits the sub shift lever. However, according to the present feature, the clutch switching lever is disposed behind the main shift lever, and therefore the height position of the driver's elbow that holds the main shift lever is high when the driver holds the main shift lever and performs a front-rear swing operation, and therefore the driver's elbow does not easily hit the main shift lever. Further, the clutch switching lever is disposed on the opposite side of the driver's seat in the vehicle left-right direction with respect to the sub shift lever, and therefore the clutch switching lever does not easily cause an obstacle when the driver operates the sub shift lever from the driver's seat.

[0067] Further, in the present application, it is preferable that the clutch switching lever is a swing operation type lever and is configured to be swing-operable after a preliminary operation.

[0068] According to the present feature, in order to perform a swing operation on the clutch switching lever, a preliminary operation is required. Thus, the driver's erroneous operation on the clutch switching lever is less likely to occur.

[0069] Further, in the present application, it is preferable that a guide portion that guides the clutch switching lever is provided, the guide portion having a straight portion that extends linearly in the swinging operation direction of the clutch switching lever, and an entry portion that has a shape for entry from a direction intersecting the swinging operation direction of the clutch switching lever in a state connected to the straight portion, the entry 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 being provided with a force applying member that applies a force to the clutch switching lever to the side of entry into the entry portion, the clutch switching lever being configured to be swingable along the straight portion after an operation of disengaging the clutch switching lever from the entry portion against the applied force of the force applying member as the preliminary operation.

[0070] According to this feature, the clutch switching lever is swingingly applied with a force by the force applying member to the side of entry into the entry portion, whereby the clutch switching lever position can be held at each operation position. Further, the driver cannot swing the clutch switching lever without disengaging the clutch switching lever from the entry portion against the applied force of the force applying member, and it is more difficult to cause the driver to misoperate the clutch switching lever.

[0071] Further, in the present application, it is preferable that a swinging support portion that swingably supports the clutch switching lever is placed on the upper surface portion of the partition wall, and the guide portion is provided above the swinging support portion.

[0072] According to this feature, the partition wall can be used as a member that supports the swinging support portion. Further, the guide portion is configured to suitably guide the clutch switching lever.

[0073] Further, in the present application, it is preferable that the guide portion is formed in the upper surface portion of the side panel.

[0074] According to this feature, the upper surface portion of the side panel can be used to form the guide portion.

[0075] Further, in the present application, it is preferable that a press-operated switch is provided at the gripping portion of the clutch switching lever, and the clutch switching lever is configured to be swingable after a press operation of the switch as the preliminary operation.

[0076] According to this feature, the structure related to the preliminary operation is a control structure realized by a press-operated switch, and the structure related to the preliminary operation can be simplified. [3]

[0078] A solution corresponding to technical problem [3] is as follows.

[0079] The present application is a combine harvester provided with a work state switching device that switches the work states of a plurality of work devices at an appropriate timing, wherein the work state switching device has: a plurality of arms that are able to swing about a same swing axis and are disposed in a state of being juxtaposed in a direction along the swing axis; a plurality of cams that are able to rotate about a same rotation axis that is parallel to the swing axis and are disposed in a state of being juxtaposed in a direction along the rotation axis in a manner corresponding to the plurality of arms, respectively; a drive actuator that rotationally drives the plurality of cams; and a plurality of steel wires that couple the plurality of arms and the plurality of work devices, respectively, and extend from the plurality of arms toward a same direction, respectively, the plurality of cams being rotationally driven by the drive actuator, whereby the plurality of arms are swung about the swing axis toward a same side by the action of the cams, respectively, the plurality of arms pull the plurality of steel wires, respectively, whereby the work states of the plurality of work devices are switched at an appropriate timing.

[0080] According to the present feature, the plurality of arms are able to swing about the same swing axis, and the plurality of arms are swung about the swing axis toward the same side by the action of the cams. Therefore, compared to a structure provided with a plurality of arms that are able to swing about a first swing axis and a plurality of arms that are able to swing about a second swing axis, for example, the number of components that constitute the work state switching device is reduced. In addition, the plurality of steel wires extend from the plurality of arms toward the same direction, respectively, so the steel wires are easily disposed in a non-interlaced manner. That is, according to the present feature, a combine harvester that is able to be simply constituted is realized.

[0081] Furthermore, in the present application, it is preferable that the work state switching device has a housing that accommodates the plurality of arms and the plurality of cams, the upper end portions of the plurality of arms each protrude upward from the housing, and each of the steel wires is joined to the upper end portion of each of the arms, the plurality of steel wires extending in a horizontal direction in a state of passing above the cams.

[0082] According to the present feature, the plurality of steel wires are disposed concentrated above the cams, so the plurality of steel wires are more easily disposed in a non-interlaced manner.

[0083] Furthermore, in the present application, it is preferable that a support portion that supports the steel wires is provided in the housing with respect to a side portion of the housing that is opposite to a side on which the cams and the arms are located.

[0084] According to the present feature, the portions of the steel wires that are distal from the arms are supported to the support portion, so the steel wires are able to be prevented from being slackened.

[0085] Further, in the present application, it is preferable that the housing have a bottom and a side wall and be open upward, and that an upper cover be provided that opens and closes the portion of the housing that is open upward. The side wall covers the plurality of arms and the plurality of cams from the front, the rear, the left, and the right.

[0086] According to this feature, it is possible to prevent external dust from entering the interior of the housing from the portion of the housing that is open upward. Further, by removing the upper cover, it is possible to easily perform cleaning and the like of the interior of the housing.

[0087] Further, in the present application, it is preferable that a cleaning port be formed in the bottom on the side opposite the side on which the cams and the arms are located, and that a bottom cover be provided that opens and closes the cleaning port.

[0088] According to this feature, by removing the bottom cover, it is possible to easily discharge dust from the interior of the housing to the exterior from the cleaning port. Further, when discharging dust to the exterior from the cleaning port, the arms are less likely to become an obstacle.

[0089] Further, in the present application, it is preferable that a support shaft be provided that straddles wall portions of the side wall that are opposite each other in the direction of the swing axis, and that the plurality of arms be supported by the support shaft in a manner that allows the arms to swing about the swing axis, and that the arm on which a greater force acts when the steel wire is pulled be supported closer to the wall portion in the support shaft.

[0090] According to this feature, even if a greater force acts on the arm when the steel wire is pulled, since the arm is supported closer to the wall portion (root side) in the support shaft, the support shaft is less likely to deform.

[0091] Further, in the present application, it is preferable that a wall portion of the side wall on the side of the extension direction of the steel wire support a relay for the drive actuator.

[0092] According to this feature, it is possible to use the side wall as a member that supports the relay. Further, in the case where the drive actuator is supported by a wall portion of the side wall in the direction of the rotation axis, the relay is less likely to become an obstacle to the drive actuator.

[0093] Further, in the present application, it is preferable that a wall portion of the side wall that is different from the wall portion that supports the relay support a control device for a device that is different from the operation state switching device.

[0094] According to this feature, it is possible to use the side wall as a member that supports the control device. Further, this is preferable from the viewpoint of effectively using the plurality of wall portions of the side wall.

[0095] Further, in the present application, it is preferable that a rotation angle detection sensor that detects a rotation angle of the cam be provided, and that the wall portion on the side of the rotation axis direction in the side wall support the drive actuator, and that the wall portion on the other side of the rotation axis direction in the side wall support the rotation angle detection sensor.

[0096] According to the present feature, the side wall can be used as a member that supports the drive actuator and the rotation angle detection sensor. Further, the drive actuator and the rotation angle detection sensor are located in the rotation axis direction, and are suitable for rotation driving by the drive actuator and rotation angle detection by the rotation angle detection sensor.

[0097] Further, in the present application, it is preferable that an attachment portion that attaches the housing to a machine body be provided on the outer portion of the housing.

[0098] According to the present feature, attachment of the housing to the machine body is performed on the outside of the housing, and attachment of the housing to the machine body is easy.

[0099] Further, in the present application, it is preferable that a harvesting portion that harvests standing grain, a threshing device that performs threshing processing on the harvested grain, a grain storage tank that stores the threshed grain, and a grain discharge device that discharges the grain in the grain storage tank be provided, and that the work device include a harvesting clutch that connects / disconnects power transmission to the harvesting portion, a threshing clutch that connects / disconnects power transmission to the threshing device, and a grain discharge clutch that connects / disconnects power transmission to the grain discharge device, and that the cam corresponding to the harvesting clutch and the cam corresponding to the threshing clutch among the plurality of cams be rotationally driven to one side around the rotation axis, and that the cam corresponding to the grain discharge clutch among the plurality of cams be rotationally driven to the other side around the rotation axis.

[0100] According to the present feature, the cam corresponding to the harvesting clutch and the cam corresponding to the threshing clutch are rotationally driven to one side around the rotation axis, and thus are preferable in a work mode in which the harvesting portion and the threshing device are simultaneously driven. Further, the cam corresponding to the grain discharge clutch is rotationally driven to the other side around the rotation axis, and thus is preferable in a work mode in which the grain discharge device is driven separately from the harvesting portion and the threshing device.

[0101] Further, in the present application, it is preferable that the working state switching device has a housing that accommodates the plurality of arms and the plurality of cams, the housing having a bottom and side walls that cover the plurality of arms and the plurality of cams from the front, the rear, the left, and the right, the combine being provided with a support shaft that supports the plurality of arms in a manner so as to be swingable about the swing axis, the plurality of arms being supported to the support shaft in a state in which the arm corresponding to the harvesting clutch and the arm corresponding to the threshing clutch sandwich the arm corresponding to the grain discharge clutch from both sides in the swing axis direction.

[0102] Generally, the force acting on the arm corresponding to the harvesting clutch when the steel cable is pulled and the force acting on the arm corresponding to the threshing clutch when the steel cable is pulled are greater than the force acting on the arm corresponding to the grain discharge clutch when the steel cable is pulled. According to this feature, even if a greater force acts on the arm corresponding to the harvesting clutch and the arm corresponding to the threshing clutch when the steel cable is pulled, since these arms are supported to the support shaft at portions (root side) close to the wall portions, the support shaft is less likely to deform. BRIEF DESCRIPTION OF DRAWINGS

[0103] Figure 1 is a right side view showing a general type combine.

[0104] Figure 2 is a plan view showing the general type combine.

[0105] Figure 3 is a left side sectional view showing the threshing device.

[0106] Figure 4 is a diagram showing the power transmission path of the present combine.

[0107] Figure 5 is a left side view showing the cab section.

[0108] Figure 6 is a plan sectional view showing the cab section.

[0109] Figure 7 is a rear sectional view showing the cab section and the engine compartment.

[0110] Figure 8 is a right sectional view showing the cab section and the engine compartment.

[0111] Figure 9 is a left sectional view showing the clutch switching lever.

[0112] Figure 10 is a plan view showing the clutch switching lever.

[0113] Figure 11 is a rear view cross-sectional view showing the clutch switching lever.

[0114] Figure 12 is a right view showing the clutch switching device and the surrounding configuration of the clutch switching device.

[0115] Figure 13 is a plan view showing the clutch switching device and the surrounding configuration of the clutch switching device.

[0116] Figure 14 is a rear view showing the clutch switching device and the surrounding configuration of the clutch switching device.

[0117] Figure 15 is an exploded perspective view showing the clutch switching device.

[0118] Figure 16 is a right view cross-sectional view showing the clutch switching device.

[0119] Figure 17 is a plan view cross-sectional view showing the clutch switching device.

[0120] Figure 18 is a diagram showing the control block.

[0121] Figure 19 is a diagram showing the rotational positions of the first, second, and third cams.

[0122] Figure 20 is a diagram showing the correspondence between the rotational positions of the first, second, and third cams and the states of the harvesting clutch, the grain discharge clutch, and the threshing clutch.

[0123] Figure 21 is a plan view showing the driving section of another embodiment.

[0124] Figure 22 is a left view showing the driving section of another embodiment.

[0125] Figure 23 is a left view cross-sectional view showing the clutch switching lever of another embodiment.

[0126] Figure 24 is a rear view cross-sectional view showing the clutch switching lever of another embodiment. DETAILED DESCRIPTION

[0127] Embodiments of the present application are described based on the drawings. Note that in the following description, the direction of an arrow F is set as the "front side of the machine body" (refer to Figure 1 and Figure 2 ), and the direction of an arrow B is set as the "rear side of the machine body" (refer to Figure 1 andFigure 2 Set the direction of arrow L to "left side of the aircraft" (refer to...). Figure 2 Set the direction of arrow R to "right side of the aircraft" (refer to...). Figure 2 ).

[0128] [The overall structure of a combine harvester]

[0129] Figure 1 and Figure 2 The image shows a standard type of combine harvester. This combine harvester is a combine harvester that threshes whole stalks of harvested rice (whole stalk feeding type combine harvester). This combine harvester has a machine frame 1 and a tracked traveling device 2. A harvesting section 3 for harvesting upright rice stalks is located at the front of the traveling machine. The harvesting section 3 has a harrowing drum 4 for harrowing upright rice stalks, a harvesting blade 5 for cutting upright rice stalks, and a harrowing auger 6 for harrowing and harvesting rice stalks.

[0130] A driver's cab section 7 is located on the right side of the front of the vehicle body. The driver's cab section 7 includes a driver's compartment 8 for the driver and a cab 9 covering the driver's compartment 8. An engine compartment ER is located below the driver's compartment 8. The engine compartment ER houses the engine E, exhaust purification device 10, cooling fan 11, and radiator 12 (see reference). Figure 7 A threshing device 13 for threshing harvested rice stalks is located behind the harvesting section 3. A feeder 14 for conveying harvested rice stalks to the threshing device 13 is located across the harvesting section 3 and the threshing device 13. A grain storage tank 15 for storing threshed grains is arranged laterally alongside the threshing device 13. The grain storage tank 15 is configured to swing open and close about a vertically extending axis Z1 across the working and maintenance positions. A fuel tank 16 is located between the rear of the threshing device 13 and the rear of the grain storage tank 15.

[0131] A grain discharge device 17 is provided to discharge grains from a grain storage bin 15 to the outside. The grain discharge device 17 includes: a longitudinal conveyor 18 that conveys grains from the grain storage bin 15 upwards; and a transverse conveyor 19 that conveys grains from the longitudinal conveyor 18 outwards from the machine body. The grain discharge device 17 is configured to rotate about the axis Z1 of the longitudinal conveyor 18. The lower end of the longitudinal conveyor 18 is connected to the bottom of the grain storage bin 15. The end of the transverse conveyor 19 on the side of the longitudinal conveyor 18 is connected to the upper end of the longitudinal conveyor 18 and is supported on the upper end of the longitudinal conveyor 18 in a manner that allows it to swing up and down.

[0132] A transmission T is provided to change the speed of power received from engine E. The transmission T includes a hydraulic continuously variable transmission (HST) 20 as the main transmission device and a gearbox 21 (see reference). Figure 4 The gearbox 21 houses a gear-type secondary transmission device, etc.

[0133] Threshing device

[0134] As Figure 3 shown, a threshing chamber 22 is formed in an upper portion of the threshing device 13. A threshing cylinder 23 is provided in the threshing chamber 22 in a manner rotatable about a rotation axis Yl extending in the machine body front-rear direction. A receiving screen 24 is provided below the threshing cylinder 23. A swing sorting device 25 that performs swing sorting of sorting objects, a fan wheel 26 that supplies sorting air to the swing sorting device 25, a primary recovery portion 27 that recovers grains (singulated grains, etc.) of primary objects, and a secondary recovery portion 28 that recovers grains (grains with stalks, etc.) of secondary objects are provided in a lower portion of the threshing device 13. A primary screw conveyor 29 that supplies the grains of the primary objects to the right is provided in the primary recovery portion 27. A secondary screw conveyor 30 that supplies the grains of the secondary objects to the right is provided in the secondary recovery portion 28. The primary screw conveyor 29 and the secondary screw conveyor 30 are provided at intervals in the machine body front-rear direction. The primary screw conveyor 29 and the secondary screw conveyor 30 are configured to be able to be withdrawn from the right side portion of the threshing device 13, and in a state in which the grain storage tank 15 is positioned at a maintenance position, the primary screw conveyor 29 and the secondary screw conveyor 30 can be withdrawn from the right side portion of the threshing device 13. A vertical conveying device 31 that conveys the grains of the primary objects from the primary screw conveyor 29 upward toward the grain storage tank 15 and a secondary return device 32 that returns the grains of the secondary objects from the secondary screw conveyor 30 to the front portion of the swing sorting device 25 are provided in the right side portion of the threshing device 13.

[0135] Power transmission path

[0136] As Figure 4 shown, a travel transmission mechanism 34 that transmits the driving force of the engine E to the HST 20 via a transmission belt is provided. The driving force of the engine E is transmitted to the crawler travel device 2 after being speed-changed by the HST 20 and the auxiliary transmission device.

[0137] A grain discharge transmission mechanism 36 that transmits the driving force of the engine E to the grain discharge device 17 via a transmission belt 35 is provided. A grain discharge clutch 37 that turns on / off the power transmission to the grain discharge device 17 by the grain discharge transmission mechanism 36 is provided. The grain discharge clutch 37 is constituted by a belt tension type clutch.

[0138] A threshing transmission mechanism 39 that transmits the driving force of the engine E to the fan wheel 26 via a transmission belt 38 is provided. A threshing clutch 40 that turns on / off the power transmission to the fan wheel 26 by the threshing transmission mechanism 39 is provided. The threshing clutch 40 is constituted by a belt tension type clutch.

[0139] A belt transmission mechanism 41 is provided which transmits 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 which transmits the power of the primary screw conveyor 29 to the longitudinal conveyor 31. A chain transmission mechanism 43 and a bevel gear transmission mechanism 44 are provided which transmit the power of the secondary screw conveyor 30 to the secondary return conveyor 32.

[0140] A belt transmission mechanism 46 is provided which transmits the power of the windmill 26 to an intermediate shaft 45. A bevel gear transmission mechanism 48 is provided which transmits the power of the intermediate shaft 45 to the threshing cylinder 23 and an intermediate shaft 47. A harvesting transmission mechanism 50 is provided which transmits the power of the intermediate shaft 45 to the feeder 14 via a transmission belt 49. A harvesting clutch 51 is provided which switches on / off the transmission of the power to the feeder 14 by the harvesting transmission mechanism 50. The harvesting clutch 51 is constituted by a belt tension type clutch.

[0141] 〔Cab section〕

[0142] As shown in FIG. 1, the cab 9 is provided with a roof section 52, a front window glass 53, side window glasses 54, a rear window glass 55, and a passenger door 56. The cab section 8 is provided with a driver's seat 57, a front panel 58, side panels 59, and a grain discharge operation section 60. The front panel 58 is provided with a steering column 61, an instrument panel 62. The steering column 61 performs operations such as steering operation of the traveling body, lifting operation of the harvesting section 3. Figures 5 to 8

[0143] A front cover 63 is provided at the front portion of the cab section 8. A front pillar 64 is provided at the front portion of the left side portion of the cab section 8. A rear pillar 65 is provided at the rear portion of the left side portion of the cab section 8. A lower frame 66 extending in the front-rear direction of the body is provided so as to straddle the front pillar 64 and the rear pillar 65. The front end portion of the lower frame 66 is supported to the front pillar 64, and the rear end portion of the lower frame 66 is supported to the rear pillar 65. The lower frame 66 is positioned at a lower side than the exhaust purification device 10.

[0144] The grain discharge operation section 60 is provided at the right rear of the driver's seat 57. The grain discharge operation section 60 is provided with a clutch switching operation section which performs switching operation of the grain discharge clutch 37 to the on state and the off state, a turning operation section which performs turning operation of the grain discharge device 17, and a lifting operation section which performs lifting operation of the grain discharge device 17 (the lateral conveyor section 19).

[0145] 〔Exhaust purification device〕

[0146] ​The exhaust purification device 10 purifies the exhaust gas from engine E using a DPF (Diesel Particulate Filter). The exhaust purification device 10 is positioned below the side panel 59 and above the engine E, extending longitudinally along the engine body. The exhaust purification device 10 protrudes to the left of the left end 59a of the side panel 59. The entire exhaust purification device 10 is covered from above by a top plate 67, not just the protruding portion of the exhaust purification device 10. The exhaust purification device 10 is supported on the upper part of engine E. The exhaust purification device 10 is connected to engine E via front and rear support members 68.

[0147] [Exhaust pipe]

[0148] Depend on Figures 12 to 14 As shown, an exhaust pipe 69 is provided for discharging exhaust gas purified by the exhaust purification device 10. The exhaust pipe 69 extends from the rear of the left side of the outer periphery of the exhaust purification device 10 to the left and upwards. The exhaust pipe 69 is arranged to pass between the threshing device 13 and the grain storage box 15, and more specifically, to pass above the clutch switching device 70 and the fuel tank 16 (described later). In the exhaust pipe 69, an external air inlet 76 is formed between the upstream end 71 connected to the exhaust purification device 10 and the downstream end 72, which is closer to the exhaust side than the upstream end 71, to introduce external air into the interior of the exhaust pipe 69 in order to reduce the exhaust temperature. A front pedal 77 and a rear pedal 78 are provided above the exhaust pipe 69 between the cab 7 and the grain storage box 15 and the threshing device 13.

[0149] [Side panel]

[0150] like Figures 5 to 8 As shown, the side panel 59 is located on the left side relative to the driver's seat 57. The side panel 59 includes a main gear shift lever 79 or a secondary gear shift lever 80, and a clutch shift lever 81. Below the side panel 59 and above the exhaust purification device 10, a position detection sensor 82 is provided to detect the operating position of the clutch shift lever 81.

[0151] The main shift lever 79 is a lever of a front-and-rear swing operation type, and performs a shift operation on the HST 20. The sub shift lever 80 is a lever of a front-and-rear swing operation type, and performs a shift operation on the sub shift device. The main shift lever 79 and the sub shift lever 80 are arranged in a lateral direction in a manner 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's seat 57 in the vehicle body left-and-right direction with respect to the sub shift lever 80. Here, when a protruding length of a portion of the main shift lever 79 that protrudes from the upper surface of the side panel 59 is set as LI and a protruding length of a portion of the sub shift lever 80 that protrudes from the upper surface of the side panel 59 is set as L2, the main shift lever 79 is configured so that the protruding length LI is longer than the protruding length L2.

[0152] An upper frame 83 that supports the side panel 59 is provided. The top panel 67 is provided to the upper frame 83. The top panel 67 is provided between the exhaust purification device 10 and the position detection sensor 82, separates the exhaust purification device 10 and the position detection sensor 82 in the up-and-down direction, and covers the entire exhaust purification device 10 from above, not only the portion of the exhaust purification device 10 that protrudes. The top panel 67 spans the front end portion and the rear end portion in the side panel 59 and spans the left side portion and the right side portion in the side panel 59.

[0153] A front cover 135 that covers the exhaust purification device 10 from the front side is provided in a lower space of the side panel 59. The lower space of the side panel 59 is divided into a front side space and a rear side space (a space on the side of the exhaust purification device 10) by the front cover 135. The upper end portion of the front cover 135 is supported to the top panel 67 via a support 136.

[0154] 〔Cover〕

[0155] A cover 84 that covers the lower space of the side panel 59 from the left side with respect to the exhaust purification device 10 is provided. The cover 84 extends in the vehicle body front-and-rear direction in a manner that the front end of the cover 84 is located on the front side than the front end of the side panel 59 and the rear end of the cover 84 is located on the rear side than the rear end of the side panel 59. A cutout portion 84a is formed in the rear portion of the cover 84 in a manner that does not interfere with the exhaust upstream side end portion 71 in the exhaust pipe 69. A raised portion 84b that is raised to the left side than other portions is formed in the cover 84. That is, when viewed from above, the portion of the cover 84 that is located in a position laterally adjacent to the exhaust purification device 10 (the raised portion 84b) is raised to the left side than other portions.

[0156] The cover 84 is configured to be supported by an upper frame 83 and a lower frame 66, and is detachable from both. The portion of the upper frame 83 corresponding to the raised portion 84b protrudes to the left compared to the other portions. The portion of the lower frame 66 corresponding to the raised portion 84b protrudes to the left compared to the other portions. The upper part of the cover 84 is detachably fixed to the longitudinal wall portion 83a of the upper frame 83 by bolts 85. A support member 86 extending upward from the lower frame 66 is provided. The lower part of the cover 84 is detachably fixed to the support member 86 by bolts 87.

[0157] [Vertical Frame]

[0158] A longitudinal frame 88 extends vertically across the upper frame 83 and the lower frame 66. The longitudinal frame 88 is located on the left side relative to the cover 84 and is positioned to overlap with the cover 84 when viewed from the side. That is, the longitudinal frame 88 is located on the left side relative to the exhaust purification device 10 and is positioned to overlap with the exhaust purification device 10 when viewed from the side. The longitudinal frame 88 is configured to be supported by the upper frame 83 and the lower frame 66 and is detachably mounted to the upper frame 83 and the lower frame 66. The upper end of the longitudinal frame 88, together with the upper part of the cover 84, is detachably fixed to the longitudinal wall portion 83a in the upper frame 83 by bolts 85. A support member 89 extends downward from the lower frame 66. The lower end of the longitudinal frame 88 protrudes downward beyond the lower end of the lower frame 66 and is detachably fixed to the support member 89 by bolts 90.

[0159] [Clutch shift lever]

[0160] like Figures 9 to 11 As shown, the clutch shift lever 81 is a swing-operated lever, a single lever for switching between the engaged and disengaged states of both the harvesting clutch 51 and the threshing clutch 40. The clutch shift lever 81 is configured to change position to a first operating position O1, a second operating position O2, and a third operating position O3. The first operating position O1 is the operating position where both the harvesting clutch 51 and the threshing clutch 40 are engaged. The second operating position O2 is the operating position where the harvesting clutch 51 is disengaged and the threshing clutch 40 is engaged. The third operating position O3 is the operating position where both the harvesting clutch 51 and the threshing clutch 40 are disengaged. The clutch shift lever 81 is located behind the main gear shift lever 79.

[0161] The clutch switching lever 81 is configured to be able to swing back and forth about a swing axis Xl extending in the left-right direction of the machine body. The clutch switching lever 81 has a handle 91, a handle-side lever body 92, a fulcrum-side lever body 93, and a lever fulcrum 94. The handle-side lever body 92 is linked to the fulcrum-side lever body 93 in a manner able to swing left and right by a hinge 95 with a spring (not shown). The spring exerts a force on the handle-side lever body 92 to swing to the left. A stopper 92a is provided on the handle-side lever body 92, which abuts against the fulcrum-side lever body 93, limiting the swing of the handle-side lever body 92 to the left.

[0162] 〔Swing support portion〕

[0163] A swing support portion 96 is provided to support the clutch switching lever 81 in a manner able to swing about the swing axis Xl. The position detection sensor 82 is also supported by the swing support portion 96. The swing support portion 96 is placed inside the side panel 59 and supported on the upper surface of the ceiling panel 67. The swing support portion 96 is composed of a substantially L-shaped plate. The swing support portion 96 has a base portion 97 along the ceiling panel 67 and a vertical or substantially vertical wall portion 98 perpendicular to the ceiling panel 67. The base portion 97 is fixed to the ceiling panel 67 by a bolt 99. A boss portion 100 is provided in the wall portion 98 for the lever fulcrum 94 to pass through. An assembly portion 101 is provided on the left side of the wall portion 98 for the position detection sensor 82 to be assembled.

[0164] 〔Guide portion〕

[0165] A lever guide 103 having a guide portion 102 that guides the clutch switching lever 81 is provided. The lever guide 103 is disposed in a state of straddling the swing support portion 96 left and right. Foot portions 103a are formed on both ends of the lever guide 103. The foot portions 103a are fixed to the ceiling panel 67 by bolts 104. The guide portion 102 is provided in the portion of the lever guide 103 that is above the swing support portion 96.

[0166] The guide portion 102 has a straight portion 102a and an entry portion 102b. The straight portion 102a extends in a straight line in the swing operation direction (front-rear direction) of the clutch switching lever 81. In the straight portion 102a, the width B2 of the interval on the first operation position Ol side is narrower than the width B1 of the interval straddling the second operation position O2 and the third operation position O3.

[0167] The entry portion 102b has a shape that enters in a state connected to the linear portion 102a in a direction (leftward direction) intersecting with the swinging operation direction of the clutch switching lever 81. The entry portion 102b is provided at a position corresponding to the first operation position Ol, a position corresponding to the second operation position O2, and a position corresponding to the third operation position O3, respectively. The handle side lever body 92 is swung by the spring to the side of the entry portion 102b in a state of entering the entry portion 102b, and thus the clutch switching lever 81 is positionally held at each operation position.

[0168] The clutch switching lever 81 is a front-rear swinging operation type lever as described above, and is configured to be able to be swung front-rear along the linear portion 102a after being prepared for operation. Specifically, the clutch switching lever 81 is configured to be able to be swung front-rear along the linear portion 102a after being subjected to an operation of disengaging the handle side lever body 92 from the entry portion 102b against the application force of the spring as the preparation operation. Thus, in a state in which the clutch switching lever 81 is positionally held at each operation position, the clutch switching lever 81 cannot be swung front-rear along the linear portion 102a, but the handle side lever body 92 can be swung rightward against the application force of the spring to be disengaged from the entry portion 102b, and the clutch switching lever 81 can be swung front-rear along the linear portion 102a.

[0169] Here, when the clutch switching lever 81 is switched from the third operation position O3 side to the first operation position Ol side in a state in which the handle side lever body 92 is swung rightward, the handle side lever body 92 abuts against the end portion 102c in the guide portion 102, and the clutch switching lever 81 is prevented from being swung frontward. Therefore, in order to release the abutment against the end portion 102c in the guide portion 102, it is necessary to swing the clutch switching lever 81 frontward after slightly swinging the handle side lever body 92 leftward.

[0170] 〔Clutch switching device〕

[0171] As Figures 12 to 17As shown, a clutch switching device 70 that switches the harvesting clutch 51, the threshing clutch 40, and the grain discharge clutch 37 to the on state and the off state at appropriate timings is provided. The clutch switching device 70 is provided between the threshing device 13 and the grain storage tank 15 on the rear side of the longitudinal conveying device 31. The clutch switching device 70 is provided between the primary screw conveyor 29 and the secondary screw conveyor 30 in the machine body front-rear direction. The clutch switching device 70 is provided below the downwardly narrowing shape portion 15a of the grain storage tank 15. In other words, the clutch switching device 70 is provided in a state of overlapping the grain storage tank 15 when viewed from above. The clutch switching device 70 is provided in a state of overlapping the base of the secondary return device 32 when viewed from the side. A fuel tank 16 is provided between the threshing device 13 and the grain storage tank 15 on the rear side of the clutch switching device 70.

[0172] The machine body frame 1 has a main frame 1A extending in the machine body front-rear direction and a cross frame 1B extending in the machine body left-right direction in a state of intersecting the main frame 1A. The clutch switching device 70 is supported at an intersection portion of the main frame 1A and the cross frame 1B. A table plate 105 is provided at the intersection portion, and the clutch switching device 70 is supported on the table plate 105 in a detachable manner.

[0173] The clutch switching device 70 has a housing 106, first, second, and third arms 107A, 107B, 107C, first, second, and third cams 108A, 108B, 108C, an electric motor M, first, second, and third wire ropes 109A, 109B, 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 discharge clutch 37. The third arm 107C, the third cam 108C, and the third wire rope 109C correspond to the threshing clutch 40.

[0174] The housing 106 houses the first, second, and third arms 107A, 107B, 107C and the first, second, and third cams 108A, 108B, 108C and is composed of a square box-shaped member that is open at the top. The housing 106 has a bottom portion 111 and a side wall 112.

[0175] A cleaning port 111a is formed in the bottom portion 111 at a portion (front portion of the bottom portion 111) opposite the side on which the first, second, and third cams 108A, 108B, 108C and the first, second, and third arms 107A, 107B, 107C are located. The cleaning port 111a is a circular opening. A bottom cover 113 that opens and closes the cleaning port 111a is provided. A portion of the table plate 105 that corresponds to the bottom cover 113 is formed with a notch portion 105a in a manner so as not to interfere with the bottom cover 113.

[0176] The side wall 112 has a front wall portion 114, a rear wall portion 115, a left side wall portion 116, and a right side wall portion 117. A fitting portion 118 for fitting the housing 106 to the table 105 is provided on the lateral outer side of the left side wall portion 116 and the lateral outer side of the right side wall portion 117. The fitting portion 118 is detachably fixed to the table 105 by a bolt 119. A nut 120 (welded nut) for the bolt 119 is provided on the back surface of the table 105.

[0177] The first, second, and third arms 107A, 107B, and 107C are swingable about the same swing axis X2 extending in the left-right direction of the machine body, and are disposed in a state of being juxtaposed in the direction of the swing axis X2. The first, second, and third arms 107A, 107B, and 107C are supported to the arm support shaft 121 in a manner capable of relative rotation. The arm support shaft 121 is disposed in a manner straddling the wall portions (the left side wall portion 116 and the right side wall portion 117) of the side wall 112 that are opposed to each other in the direction of the swing axis X2. The lower end portions of the first, second, and third arms 107A, 107B, and 107C are connected to the arm support shaft 121. Stoppers 122 for positioning the first, second, and third arms 107A, 107B, and 107C at initial positions (wire rope extraction positions) are provided in the arm support shaft 121. The arm support shaft 121 and the stoppers 122 are connected via a support member 123. When viewed in side elevation (see FIG. 6), the first, second, and third arms 107A, 107B, and 107C at the wire rope extraction positions are in a slightly forwardly inclined inclined posture, and thus the stroke S straddling the wire rope extraction positions and the wire rope termination positions can be increased for use with a variety of machines. Figure 16

[0178] The first, second, and third arms 107A, 107B, and 107C are each composed of a member having a substantially U-shaped cross-sectional shape. The upper end portions of the first, second, and third arms 107A, 107B, and 107C respectively protrude upward from the housing 106. A first roller 123A capable of contacting the first cam 108A is provided in the upper and lower intermediate portions of the first arm 107A. A second roller 123B capable of contacting the second cam 108B is provided in the upper and lower intermediate portions of the second arm 107B. A third roller 123C capable of contacting the third cam 108C is provided in the upper and lower intermediate portions of the third arm 107C.

[0179] ​The first arm 107A side end of the first wire rope 109A core wire is connected at the upper end of the first arm 107A. An adjusting spring (not shown in the figure) is provided at the grain discharge clutch 37 side end of the first wire rope 109A core wire, but no adjusting spring is provided between the upper end of the first arm 107A and the first arm 107A side end of the first wire rope 109A core wire. The second arm 107B side end of the second wire rope 109B core wire is connected at the upper end of the second arm 107B. An adjusting spring (not shown in the figure) is provided at the threshing clutch 40 side end of the second wire rope 109B core wire, but no adjusting spring is provided between the upper end of the second arm 107B and the second arm 107B side end of the second wire rope 109B core wire. The third arm 107C side end of the third wire rope 109C core wire is connected at the upper end of the third arm 107C. An adjusting spring (not shown in the figure) is provided at the threshing clutch 40 side end of the third wire rope 109C core wire, but no adjusting spring is provided between the upper end of the third arm 107C and the third arm 107C side end of the third wire rope 109C core wire.

[0180] The first, second, and third arms 107A, 107B, 107C are supported by the arm support shaft 121 in a state in which the first arm 107A corresponding to the reaping clutch 51 and the third arm 107C corresponding to the threshing clutch 40 sandwich the second arm 107B corresponding to the grain discharge clutch 37 from both sides in the direction of the oscillation axis X2. That is, 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.

[0181] Here, generally, the force acting on the first arm 107A when the first wire rope 109A is pulled, the force acting on the third arm 107C when the third wire rope 109C is pulled, and the force acting on the second arm 107B when the second wire rope 109B is pulled are in the order of the force acting on the first arm 107A, the force acting on the third arm 107C, and the force acting on the second arm 107B. That is, the arm on which the greater force acts when the first, second, and third wire ropes 109A, 109B, 109C are pulled is supported by a portion of the arm support shaft 121 closer to the left side wall portion 116 or the right side wall portion 117.

[0182] The first, second, and third cams 108A, 108B, 108C are rotatable about the same rotation axis X3 extending in the left-right direction of the main body in parallel with the swing axis X2, and are disposed in a state of being juxtaposed in the direction of the rotation axis X3 in a manner corresponding to the first, second, and third arms 107A, 107B, 107C. The first, second, and third cams 108A, 108B, 108C are rotatably supported to a cam support shaft 124. The cam support shaft 124 is disposed in a manner straddling the left and right wall portions 116, 117. Bearings 125 rotatably supporting the cam support shaft 124 are provided to the left and right wall portions 116, 117, respectively. The first, second, and third cams 108A, 108B, 108C are coupled to the cam support shaft 124 via keys 126. A gear portion is formed in the outer peripheral portion of the first cam 108A.

[0183] Holes 108Aa, 108Ba, 108Ca are formed in the first, second, and third cams 108A, 108B, 108C, respectively. By assembling the first, second, and third cams 108A, 108B, 108C to the cam support shaft 124 in a manner in which the positions of the holes 108Aa, 108Ba, 108Ca about the rotation axis X3 coincide (in other words, in a manner in which the holes 108Aa, 108Ba, 108Ca overlap when viewed in the direction of the rotation axis X3), erroneous assembly of the first, second, and third cams 108A, 108B, 108C with respect to the cam support shaft 124 can be prevented.

[0184] A rotation angle detection sensor 127 that detects the rotation angle of the first, second, and third cams 108A, 108B, 108C is provided. An assembly groove 124a to which the rotation angle detection sensor 127 is assembled is formed in the right end portion of the cam support shaft 124. The rotation angle detection sensor 127 is supported to the right wall portion 117. An assembly portion 128 to which the rotation angle detection sensor 127 is assembled is provided to the right wall portion 117.

[0185] Here, when the assembly portion 128 is provided to the right wall portion 117 as described above, the cam support shaft 124 needs to be assembled to the housing 106 in a state in which the assembly groove 124a is positioned on the right side. When the cam support shaft 124 is erroneously assembled to the housing 106 in a state in which the assembly groove 124a is positioned on the left side, the rotation angle detection sensor 127 cannot be assembled to the cam support shaft 124, and thus it is possible to notice that the cam support shaft 124 has been assembled upside down.

[0186] The first wire rope 109A is coupled to the first arm 107A and the harvesting clutch 51 so as to straddle the first arm 107A and the harvesting clutch 51. The first wire rope 109A extends from the upper end portion of the first arm 107A toward the front and extends in the horizontal direction toward the front in a state of passing above the first cam 108A. The second wire rope 109B is coupled to the second arm 107B and the grain discharge clutch 37 so as to straddle the second arm 107B and the grain discharge clutch 37. The second wire rope 109B extends from the upper end portion of the second arm 107B toward the front and extends in the horizontal direction toward the front in a state of passing above the second cam 108B. The third wire rope 109C is coupled to the third arm 107C and the threshing clutch 40 so as to straddle the third arm 107C and the threshing clutch 40. The third wire rope 109C extends from the upper end portion of the third arm 107C toward the front and extends in the horizontal direction toward the front in a state of passing above the third cam 108C.

[0187] A support portion 129 that supports the first, second, and third wire ropes 109A, 109B, 109C is provided. The first arm 107A-side end portion of the outer wire of the first wire rope 109A, the second arm 107B-side end portion of the outer wire of the second wire rope 109B, and the third arm 107C-side end portion of the outer wire of the third wire rope 109C are supported by the support portion 129. The support portion 129 is provided on the upper surface of the side portion (front portion of the side wall 112) of the housing 106 on the side opposite to the side on which the first, second, and third cams 108A, 108B, 108C and the first, second, and third arms 107A, 107B, 107C are located. The support portion 129 is composed of a substantially L-shaped plate.

[0188] The upper cover 110 opens and closes the portion of the housing 106 that is open upward, and is composed of a square box-shaped member that is open downward and forward. The first, second, and third wire ropes 109A, 109B, 109C pass through the portion of the upper cover 110 that is open forward. The portion of the upper cover 110 that is open forward is blocked from the front by the support portion 129. The left and right side portions of the lower rear portion of the upper cover 110 are respectively fixed to the left and right side wall portions 116, 117 by bolts 130. The left and right side portions of the lower front portion of the upper cover 110 are respectively formed with engagement protrusions 110a that engage with the corner portions of the support portion 129.

[0189] The electric motor M rotationally drives the first, second, and third cams 108A, 108B, 108C. A pinion 131 that engages with the gear portion of the first cam 108A is provided on the output shaft Ma of the electric motor M. 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, whereby the first, second, and third cams 108A, 108B, 108C are rotationally driven.

[0190] The electric motor M is supported to the left side wall portion 116. The electric motor M is fixed to the left side wall portion 116 by a bolt. A relay 132 for the electric motor M is supported to a wall portion (front wall portion 114) of the side wall 112 on the side in the extending direction of the first, second, and third wire ropes 109A, 109B, 109C. The relay 132 is fixed to the front wall portion 114 by a bolt. A control device 133 for the cooling fan 11 is supported to a wall portion (right side wall portion 117) of the side wall 112 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.

[0191] As shown in Figure 18 , the control block is provided with a control device 134 that performs drive control of the electric motor M. The control device 134 is connected with the position detection sensor 82 or the grain discharge operation portion 60, the rotation angle detection sensor 127, and the electric motor M. The control device 134 is inputted with the detection value of the position detection sensor 82, the clutch switching operation command of the grain discharge operation portion 60, and the detection value of the rotation angle detection sensor 127. The control device 134 performs drive control of the electric motor M in accordance with the detection value of the position detection sensor 82 and the clutch switching operation command of the grain discharge operation portion 60.

[0192] Figure 19 The rotation positions (neutral position N, first rotation position Rl, second rotation position R2, third rotation position R3) of the first, second, and third cams 108A, 108B, 108C are shown in the center. The first cam 108A corresponding to the reaping 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) around the rotation 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) around the rotation axis X3. The first, second, and third cams 108A, 108B, 108C are rotationally driven by the electric motor M, whereby the first, second, and third arms 107A, 107B, 107C are swung to the rear side around the swing axis X2 by the action of the first, second, and third cams 108A, 108B, 108C (cam action to the first, second, and third rollers 123A, 123B, 123C) respectively, and the first, second, and third arms 107A, 107B, 107C pull the first, second, and third wire ropes 109A, 109B, 109C respectively, whereby the reaping clutch 51, the threshing clutch 40, and the grain discharge clutch 37 are switched to the on state and the off state at appropriate timings.

[0193] In detail, as shown in Figure 20As shown, in the neutral position N, the first, second, and third cams 108A, 108B, and 108C do not perform cam action on the first, second, and third arms 107A, 107B, and 107C, respectively. Therefore, the harvesting clutch 51, the grain discharge clutch 37, and the threshing clutch 40 are in the disengaged state.

[0194] In the first rotational position R1, the third cam 108C acts as a cam on the third arm 107C, while the first and second cams 108A and 108B do not act as cams on the first and second arms 107A and 107B respectively. Therefore, the threshing clutch 40 is engaged, and the harvesting clutch 51 and the grain discharge clutch 37 are disengaged.

[0195] In the second rotational position R2, the first and third cams 108A and 108C respectively act as cams on the first and third arms 107A and 107C, while the second cam 108B does not act as a cam on the second arm 107B. Therefore, the harvesting clutch 51 and the threshing clutch 40 are engaged, and the grain discharge clutch 37 is disengaged.

[0196] In the third rotational position R3, the second cam 108B acts as a cam on the second arm 107B, while the first and third cams 108A and 108C do not act as cams on the first and third arms 107A and 107C, respectively. Therefore, the grain discharge clutch 37 is engaged, and the harvesting clutch 51 and the threshing clutch 40 are disengaged.

[0197] [Other Implementation Methods]

[0198] (1) In the above embodiment, the exhaust pipe 69 extends from the rear part of the left side of the outer periphery of the exhaust purification device 10 to the left and extends upward and backward. However, the exhaust pipe 69 may also extend upward from the right side, upper surface, lower surface, front surface, or rear surface of the outer periphery of the exhaust purification device 10. For example, as Figure 21 and Figure 22 As shown, the exhaust pipe 69 can also be led out from the rear of the upper surface of the outer periphery of the exhaust purification device 10 and extend upward and backward.

[0199] (2) In the above embodiment, a swing support portion 96 is mounted on the upper surface of the top plate 67. However, as Figures 21 to 24As shown, the swing support portion 96 can be suspendedly supported on the lower surface of the upper surface portion of the side panel 59. The guide portion 102 is formed on the upper surface portion of the side panel 59. The swing support portion 96 includes a first support plate 137 and a second support plate 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 portion of the side panel 59. The second support plate 138 is fixed to the lower surface of the first support plate 137 from the left side by a bolt 139. A fitting portion 101 for fitting the position detection sensor 82 is provided on the left side portion of the second support plate 138.

[0200] The exhaust purification device 10 is located below and behind the position detection sensor 82. A partition wall 140 is provided between the exhaust purification device 10 and the position detection sensor 82 to partition the exhaust purification device 10 and the position detection sensor 82 vertically. The partition wall 140 spans the left side portion and the right side portion of the side panel 59. The partition wall 140 includes a bottom portion 141 covering the position detection sensor 82 from below and a rear wall portion 142 covering the position detection sensor 82 from behind. An upper front support 143 and a lower front support 144 are provided to support the front portion of the side panel 59. The bottom portion 141 is provided so as to span the lower end portion of the upper front support 143 and the rear wall portion 142. A support 145 is provided on the upper front support 143 to which the front end portion of the bottom portion 141 is bolted. The rear end portion of the bottom portion 141 is bolted to the lower end portion of the rear wall portion 142. The rear wall portion 142 is suspendedly supported on the lower surface of the upper surface portion of the side panel 59.

[0201] (3) In the above embodiment, the exhaust purification device 10 is provided so as to protrude to the left side beyond the left end 59a of the side panel 59. However, the exhaust purification device 10 can be provided so as not to protrude to the left side beyond the left end 59a of the side panel 59. In this case, the protruding portion 84b can not be formed in the cover 84.

[0202] (4) In the above embodiment, the cover 84 is configured to be detachable. However, the cover 84 can be configured to be non-detachable.

[0203] (5) In the above embodiment, the clutch switching lever 81 is provided behind the main shift lever 79. However, the clutch switching lever 81 can be provided behind the sub shift lever 80.

[0204] (6) In the above embodiment, the clutch switching lever 81 is configured to be able to be swung back and forth along the straight portion 102a after being subjected to the operation of disengaging the handle-side lever body 92 from the entry portion 102b against the applied force of the spring as the preliminary operation. However, it is also possible that a push operation type switch (omitted from the drawing) is provided at the gripping portion of the clutch switching lever 81, and the clutch switching lever 81 is configured to be able to be swung after being subjected to the push operation of the switch as the preliminary operation. Further, the clutch switching lever 81 can also be configured to be able to be swung even without being subjected to the preliminary operation.

[0205] (7) In the above embodiment, the clutch switching device 70 is provided between the primary screw conveyor 29 and the secondary screw conveyor 30 in the machine body front and rear direction. However, the clutch switching device 70 can also be provided on the rear side than the secondary screw conveyor 30.

[0206] (8) In the above embodiment, the clutch switching device 70 is provided below the downwardly-narrowing-shaped portion 15a in the grain storage tank 15 (in other words, in a state of overlapping with the grain storage tank 15 when viewed from above). However, it is also possible that the clutch switching device 70 is provided in a state of not overlapping with the grain storage tank 15 when viewed from above.

[0207] (9) In the above embodiment, the fuel tank 16 is provided between the threshing device 13 and the grain storage tank 15 on the rear side of the clutch switching device 70. However, it is also possible that the fuel tank 16 is provided between the threshing device 13 and the grain storage tank 15 on the front side of the clutch switching device 70.

[0208] (10) In the above embodiment, the platform 105 is provided at the intersection portion where the main frame 1A and the cross frame 1B intersect, and the clutch switching device 70 is supported to the platform 105 in a detachable manner. However, it is also possible to support the clutch switching device 70 to the intersection portion without providing the platform 105. Further, it is also possible that the clutch switching device 70 is supported only to the main frame 1A.

[0209] (11) In the above embodiment, the housing 106 is open upward, and the upper cover 110 that opens and closes the portion of the housing 106 that is open upward is provided. However, it is also possible that the housing 106 is not open upward, and the upper cover 110 is not provided.

[0210] (12) In the above embodiment, the first arm 107A is supported at 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 at 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 can be reversed. Also, the second arm 107B can be supported at a portion of the arm support shaft 121 closer to the left side wall portion 116 or the right side wall portion 117.

[0211] (13) In the above embodiment, the relay 132 for the electric motor M is supported at the front wall portion 114 of the side wall 112. However, the relay 132 can be supported at a wall portion other than the front wall portion 114 of the side wall 112. Also, the relay 132 can not be supported at the side wall 112.

[0212] (14) In the above embodiment, the control device 133 for the cooling fan 11 is supported at the right side wall portion 117 of the side wall 112. However, the control device 133 can be supported at a wall portion other than the right side wall portion 117 of the side wall 112. Also, the control device 133 can not be supported at the side wall 112.

[0213] (15) In the above embodiment, the electric motor M is supported at the left side wall portion 116 of the side wall 112, and the rotation angle detection sensor 127 is supported at the right side wall portion 117 of the side wall 112. However, the electric motor M can be supported at the right side wall portion 117 of the side wall 112, and the rotation angle detection sensor 127 can be supported at the left side wall portion 116 of the side wall 112.

[0214] (16) In the above embodiment, the control target of the clutch switching device 70 is the harvesting clutch 51, the threshing clutch 40, and the grain discharge clutch 37. However, the control target of the clutch switching device 70 is not limited to the control targets of the above embodiment. For example, in the case where the control target of the clutch switching device 70 is increased, since there is still room in the left and right widths of the housing 106, it is possible to increase the cam in the rotation axis X3 direction. Also, the clutch switching device 70 is a work state switching device that switches the work states of a plurality of work devices (in the above embodiment, the harvesting clutch 51, the threshing clutch 40, and the grain discharge clutch 37) at appropriate timings, but the control target of the work state switching device can be a clutch other than the clutches of the above embodiment, a speed change device.

[0215] Industrial applicability

[0216] The present application can be used not only for a general type combine harvester but also for a semi-feed type combine harvester.

[0217] Reference Signs List

[0218] 1: body frame; 1A: main frame; 1B: cross frame; 3: harvesting section; 8: driver's section; 10: exhaust purification device; 13: threshing device; 15: grain storage tank (grain storage section, grain storage tank); 15a: downwardly-narrowing shape portion; 16: fuel tank; 17: grain discharge device; 20: main transmission device; 29: primary screw conveyor; 30: secondary screw conveyor; 31: longitudinal conveying device; 32: secondary return device; 37: grain discharge clutch; 40: threshing clutch; 51: harvesting clutch; 57: driver's seat; 59: side panel; 67: top panel (partition wall); 69: exhaust pipe; 70: clutch switching device (operation state switching device); 79: main shift lever; 80: sub shift lever; 81: clutch switching lever; 82: position detection sensor; 96: swing support section; 102: guide section; 102a: straight section; 102b: entry section; 105: deck; 106: housing; 107A: first arm; 107B: second arm; 107C: third arm; 108A: first cam; 108B: second cam; 108C: third cam; 109A: first wire rope (harvesting wire rope); 109B: second wire rope; 109C: third wire rope (threshing wire rope); 110: upper cover; 111: bottom section; 111a: cleaning port; 112: side wall; 113: bottom cover; 118: fitting section; 121: arm support shaft (support shaft); 127: rotation angle detection sensor; 129: support section; 132: relay; 133: control device; 140: partition wall; 141: bottom section; 142: rear wall section; E: engine; ER: engine room; L1: protruding length; L2: protruding length; M: electric motor (driving actuator); O1: first operation position; O2: second operation position; O3: third operation position; X2: swing axis; X3: rotation axis.

Claims

1. A combine harvester, comprising: a harvesting unit that harvests standing grain; a threshing device that performs a threshing process on the harvested grain; a grain storage tank that stores the grain subjected to the threshing process; a grain discharge device that discharges the grain in the grain storage tank; and a working state switching device that switches the working states of a plurality of working devices at an appropriate timing, characterized in that the working devices include a harvesting clutch that connects / disconnects power transmission to the harvesting unit, a threshing clutch that connects / disconnects power transmission to the threshing device, and a grain discharge clutch that connects / disconnects power transmission to the grain discharge device, the working state switching device includes a plurality of arms that are swingable about a same swing axis and are arranged in a state of being juxtaposed in a direction of the swing axis, a plurality of cams that are rotatable about a same rotation axis parallel to the swing axis and are arranged in a state of being juxtaposed in a direction of the rotation axis in a manner corresponding to the plurality of arms, respectively, and a drive actuator that rotationally drives the plurality of cams, and a plurality of steel wires that link the plurality of arms and the plurality of working devices, respectively, and extend from the plurality of arms toward a same direction, respectively, the plurality of cams are rotationally driven by the drive actuator, whereby the plurality of arms are swung about the swing axis toward a same side by the action of the cams, respectively, and the plurality of arms pull any one of the plurality of steel wires, whereby the working states of the plurality of working devices are switched at the appropriate timing, the plurality of arms include only an arm that swings to pull any one of the plurality of steel wires only when the plurality of cams are rotated about the rotation axis toward one side, and an arm that swings to pull any one of the plurality of steel wires only when the plurality of cams are rotated about the rotation axis toward the other side, the combine harvester is configured to pull the steel wires by all of the plurality of arms being swung about the swing axis toward the same direction, a cam corresponding to the harvesting clutch and a cam corresponding to the threshing clutch among the plurality of cams are rotationally driven about the rotation axis toward one side, and a cam corresponding to the grain discharge clutch among the plurality of cams is rotationally driven about the rotation axis toward the other side.

2. The combine harvester according to claim 1, characterized in that the working 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 each protrude upward from the housing, and each of the steel wires is linked to the upper end portion of the corresponding arm, and the plurality of steel wires extend in a horizontal direction in a state of passing above the cams.

3. The combine harvester according to claim 2, characterized in that a support portion that supports the steel wires is provided in a side portion of the housing opposite to a side on which the cams and the arms are located.

4. The combine harvester according to claim 2 or 3, characterized in that the housing has a bottom portion and side walls that cover the plurality of arms and the plurality of cams from a front side, a rear side, a left side, and a right side, and is open upward. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The upper cover opens and closes a portion of the housing that is open upward.

5. The combine harvester according to claim 4, characterized in that A cleaning port is formed in a portion of the bottom opposite the cam on a side opposite the side on which the arm is located, The combine harvester is provided with a bottom cover that opens and closes the cleaning port.

6. The combine harvester according to claim 4, characterized in that A support shaft is provided that spans wall portions of the side wall that are opposite each other in the direction of the swing axis center and supports the plurality of arms in a manner that allows them to swing about the swing axis center, An arm of the plurality of arms that is acted upon by a greater force when the steel wire rope is pulled is supported closer to the wall portion in the support shaft.

7. The combine harvester according to claim 4, characterized in that A relay for the drive actuator is supported by a wall portion of the side wall on a side of the steel wire rope in the direction of extension.

8. The combine harvester according to claim 7, characterized in that A control device for a device other than the operation state switching device is supported by a wall portion of the side wall that is different from the wall portion that supports the relay.

9. The combine harvester according to claim 4, characterized in that A rotation angle detection sensor that detects the rotation angle of the cam is provided, The drive actuator is supported by a wall portion of the side wall on one side in the direction of the rotation axis center, and the rotation angle detection sensor is supported by a wall portion of the side wall on the other side in the direction of the rotation axis center.

10. The combine harvester according to claim 4, characterized in that A fitting portion that fits the housing to a machine body is provided on an outer portion of the housing.

11. The combine harvester according to claim 1, characterized in that The operation state switching device has a housing that accommodates the plurality of arms and the plurality of cams, The housing has a bottom portion 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, The combine harvester is provided with a support shaft that spans wall portions of the side wall that are opposite each other in the direction of the swing axis center and supports the plurality of arms in a manner that allows them to swing about the swing axis 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 sandwich an arm corresponding to the grain discharge clutch from both sides in the direction of the swing axis center.

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