JP2009082013A - Structure for driving grain-collecting part in combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect an intermediate transmission shaft with an input part of an input case to be carried out smoothly and the connected state to be kept accurately, when turning and moving a grain-collecting tank from a maintenance position to a grain-collecting position, in a structure for driving a grain-collecting part in a combine harvester, constituted so that motive power is transmitted to the front-end part of a bottom screw possessed by the grain-collecting tank. <P>SOLUTION: The structure for driving the grain-collecting part in the combine harvester is constituted, such that a horizontal input shaft 54, connected to the front end part of the bottom screw 10 to be interlocked is installed so as to face to the inside of the machine body, and the input shaft 54 and an intermediate transmission shaft 71, connected to the engine 4 to be interlocked are arranged concentrically so as to face to each other. A clutch 73 in a meshing type, detachable to the facing position from the rotary shaft center direction is installed, and a clutch member 74, capable of being displaced in the retreating direction with respect to a spring-urging force, and an engaging member 75 detachable to an engaging recessed part 76, formed at the terminal part of the clutch member 74 are also installed in the clutch 73. The engaging position in the engaging recessed part 76 is formed into a shape which penetrates in the direction of being rotated and driven, and then expands inwardly. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drive structure of a combine grain recovery unit configured to store and recover harvested grain, and in particular, an engine is disposed in front of a grain recovery tank, and engine power is supplied to the grain recovery tank. The combine grain recovery unit drive structure is configured to transmit to the front end portion of the bottom screw provided in the above.

As the grain recovery unit drive structure, there are an output shaft projecting from the horizontally arranged engine toward the machine body, and an intermediate part of the intermediate transmission shaft disposed laterally in front of the grain recovery tank. Is coupled via a transmission belt and linked to the inner side of the intermediate transmission shaft and the input case provided in the front part of the grain recovery tank to link the engine power to the intermediate transmission shaft. And what is comprised so that it may transmit to the front-end part of a bottom screw via an input case is known. Furthermore, what constituted the grain recovery tank to turn the outer side of the machine body around the vertical fulcrum at the rear and open the lateral side part of the threshing apparatus is known (see, for example, Patent Document 1). .
JP-A-9-205867

  In the above conventional structure, the outer end of the intermediate transmission shaft consisting of a hexagonal shaft is removably inserted into the center hexagonal hole of the input gear rotatably supported by the input case, so that a grain recovery tank When the machine is swung to the outside maintenance position, the input gear of the input case that moves to the outside of the fuselage is automatically removed from the intermediate transmission shaft, and the grain collection tank turns to the original grain collection position. When it is moved, the input gear of the input case that has swiveled to the original position is automatically inserted and connected to the intermediate transmission shaft. Therefore, it is difficult to smoothly insert the intermediate transmission shaft into the central hexagonal hole of the input gear.

  The present invention has been made paying attention to such points, and when rotating the grain collection tank from the maintenance position to the original grain collection position, the intermediate transmission shaft, the input unit of the input case, It is an object of the present invention to be able to smoothly connect and to maintain the connection state reliably.

A first invention is a combine grain drive unit drive structure for a combine, wherein an engine is arranged on the front side of a grain collection tank and engine power is transmitted to a front end portion of a bottom screw provided in the grain collection tank. And
An intermediate transmission shaft linked to the engine is laterally supported on the front side of the grain collection tank, and the grain collection tank is supported so as to be swingable around a vertical longitudinal fulcrum. A front side of the recovery tank is equipped with a lateral input shaft linked to the front end of the bottom screw facing the body, and the input shaft and the intermediate transmission shaft are concentrically opposed to each other. With a meshing clutch that can be engaged and disengaged from the direction of the rotation axis,
The clutch includes a clutch member that can be displaced backward against a spring biasing force, and an engagement member that is engaged with and disengaged from an engagement recess formed at an end of the clutch member. It is characterized in that the joint portion is formed in a widened shape entering the rotational drive direction.

  According to the above configuration, when the grain collection tank is swung from the grain collection position to the maintenance position, the engagement between the engagement member and the clutch member is disengaged as the input shaft moves laterally outward. The connection between the transmission shaft and the input shaft is released. Conversely, when the grain collection tank is swung from the maintenance position to the original grain collection position, the engaging member and the clutch member are engaged from the axial direction along with the swiveling movement of the input shaft inward and laterally. Thus, the intermediate transmission shaft and the input shaft are automatically linked and connected. When the grain recovery tank is swung from the maintenance position to the grain recovery position, the rotational phase of the clutch member and the engaging member that have stopped rotating may be misaligned. When the engagement member and the clutch member are pressed against each other, the clutch member is slid back against the spring biasing force, and then when the intermediate rotation shaft starts to rotate, the engagement recess of the clutch member and the engagement member match. Then, the clutch member is urged and slid to engage the clutch, and the intermediate rotation shaft and the input shaft are automatically linked to each other.

  Since the engaging recess and the engaging member are engaged with each other, the clutch member moves backward due to a thrust force generated by a large driving reaction force or the like, and the engagement with the engaging member is arbitrarily released. This is avoided in advance.

  Therefore, according to the first invention, when the grain recovery tank is swung from the maintenance position to the original grain recovery position, the intermediate transmission shaft and the input portion of the input case can be smoothly connected. This connection state can be reliably maintained.

According to a second invention, in the first invention,
The intermediate transmission shaft is movable in the direction of the rotation axis, and is biased with a spring toward the input shaft. The clutch member is connected to the intermediate transmission shaft, and the engagement member is connected to the input shaft. It is what is.

  For example, when the input shaft on the side of the grain collection tank is configured to slide, the input shaft that has been moved outwards and exposed to the outside when turning to the maintenance position of the grain collection tank is used as another object. If it is configured to be slidable, the intermediate transmission shaft left on the aircraft side may be slid, although it may be slid unnecessarily by hitting it or it may be damaged by hitting a spring for urging the slide against other objects. When turning the grain collection tank to the maintenance position, there is almost no risk of causing the input shaft or the spring to hit another object and causing it to slide or damage unnecessarily, and can be suitably operated for a long period of time.

According to a third invention, in the second invention,
The engaging member is constituted by a spring pin that is driven and fixed to the input shaft.

  According to the above configuration, the spring pin can be obtained at a low cost, and can be reliably driven and fixed even if the accuracy of the driving hole is somewhat poor. Even when the engaging member is damaged, it can be easily replaced.

  FIG. 1 shows a side view of the self-removable combine combiner as seen from the right side of the fuselage. In this combine, a cutting part 3 having a plurality of cuts is movably connected to a front part of an airframe frame 2 having a pair of left and right crawler travel devices 1, and an engine 4 is mounted on the right front part of the airframe frame 2. The motive unit 5 and the operating unit 6 are arranged, and the threshing device 7 is mounted on the left side of the machine frame 2, and the grain of the sheet metal structure is provided on the right side of the threshing device 7 on the rear side of the driving unit 5. It has a structure equipped with a recovery tank 8, and the cereals harvested by the harvesting unit 3 are supplied to the threshing device 7 for threshing, and the grains selected and collected by the threshing device 7 are screw-type threshing devices. 9 is configured to be lifted by 9 and put into the grain collection tank 8.

  As shown in FIGS. 4 and 8, the grain collection tank 8 is formed in a constricted lower part when viewed in the front-rear direction, and on the left side facing the body, the grain raising device A vertically long recess 8a in which 9 is inserted is formed. Recesses 8b and 8c are formed before and after the vertically elongated recess 8a so as to avoid interference with the device portion protruding on the right side of the threshing device 7, and a bulging portion 8d for increasing is formed at the front upper part of the vertically elongated recess 8a. ing. Thus, a large tank capacity is ensured by making the left side of the grain collection tank 8 as close as possible to the right side shape of the threshing device 7.

  A bottom screw 10 that feeds the stored grain backward is horizontally supported at the lower end of the lower constricted portion 8e of the grain recovery tank 8 via a support shaft 10a, and above the bottom screw 10. A flow guide plate 11 having a mountain-shaped cross section is supported by a pivot shaft 12 so as to be swingable.

  The lower constricted portion 8e in the grain collection tank 8 is provided with an inclination angle that is equal to or greater than the flow down repose angle of the grain so as to guide the stored grain to the bottom screw 10 without leaving the stored grain. The lower end portion of the lower constricted portion 8a is disposed larger than the center of the lateral width of the tank so as to be offset laterally outward so as to be located outside of 2. In this way, the lower end portion of the lower constricted portion 8e that accommodates the bottom screw 10 is positioned outside the body frame 2 so that the lower end portion of the lower constricted portion 8e of the grain collection tank 8 is located above the body frame 2. Compared with the case where it is located in, the lower end part of the constricted part 8e of the grain collection tank 8 can be installed low, and thereby the tank height (vertical length) can be increased without increasing the tank upper end position. The capacity can be increased by increasing the capacity.

  Behind the grain collection tank 8 is equipped with a screw-type grain unloading device 13 that lifts the grain delivered by the bottom screw 10 and then laterally conveys it to the outside. The grain carry-out device 13 includes a screw-type vertical conveyance mechanism 13A connected to the lower end of the rear surface of the grain recovery tank 8, and a screw-type horizontal conveyance mechanism 13B connected to the upper end of the vertical conveyance mechanism 13A. The whole grain carry-out device 13 is pivotable about a longitudinal fulcrum P that is concentric with the screw shaft of the vertical transport mechanism 13A.

  As shown in FIG. 6, the lower rear end of the grain recovery tank 8 is connected to a carry-out case 14 that supports the rear end portion of the support shaft 10 a of the bottom screw 10, and from the body frame 2 to the outer side of the body. The lower end boss portion 14a of the carry-out case 14 is rotatably fitted and supported on the support portion 2a projecting from the support portion 2a, and the grain collection tank 8 is supported so as to be pivotable around the longitudinal fulcrum P. . As shown in FIG. 12, a support plate 15 made of a thick plate material is provided on the lower front surface of the grain collection tank 8, and the lower end portion of the support plate 15 is placed and supported on the upper surface of the machine body frame 2. The total weight of the collection tank 8 is supported by the machine body frame 2 and the support portion 2a at two locations in the front and rear.

  The support plate 15 is provided with a lock pin 20 that can slide up and down. The lock pin 20 is slid downward by a spring 21. By inserting the lower end of the lock pin 20 into a lock hole 22 provided on the side of the machine body frame 2, the grain recovery tank 8 has a predetermined grain. It is fixed at the collection position, and the lock pin 20 is pulled out from the lock hole 22 against the spring 21, so that the grain collection tank 8 is pivoted around the longitudinal fulcrum P and the right side portion of the threshing device 7 is greatly opened. It can be moved to the maintenance position. The lock pin 20 can be locked and held by a receiving metal 23 provided on the support plate 15 by being pulled up and rotated.

  As shown in FIG. 1 to FIG. 3 and FIG. 11, a side cover 25 that covers the side of the tank is connected and fixed to the lateral outer side of the grain collection tank 8. A lower side cover 26 is connected to the lower end of the side cover 25 to cover the outwardly narrowed portion 8e of the grain collection tank 8 from the lateral outer side. A rear side cover 27 having a work light 28, a vehicle width light 29, and the like is connected to the rear end portion of the side cover 25 while covering most of the vertical transport mechanism 13A in the grain unloading device 13 from the lateral side. Yes. A vertical frame 31 made of a square pipe is erected from the body frame 2 at a rear side portion of the vertical conveyance mechanism 13A, and a rear cover 30 that covers the vertical conveyance mechanism 13A from the rear is connected and fixed to the vertical frame 31. When the grain collection tank 8 is swung laterally outward around the longitudinal fulcrum P, the rear side cover 27 that pivots integrally with the grain collection tank 8 is fixed as shown by the phantom line in FIG. The rear cover 30 does not interfere with the rear cover 30 and does not interfere with the rear cover 30. As shown in FIG. 12, a movable cover 32 is attached to the front end portion of the lower side cover 26 so as to be swingable openable and closable around a longitudinal fulcrum a. By opening the movable cover 32, the lock pin 20 is exposed so that the operation of locking and unlocking the grain collection tank 8 can be performed.

  The vertical transport mechanism 13A in the grain unloading device 13 is configured by internally mounting a vertical feed screw 36 on a vertical transport case 35 made of a round pipe material. As shown in FIG. 6, the lower end portion of the transport case 35 is inserted into and supported by the carry-out case 14 so as to be rotatable around the longitudinal fulcrum P, and the cylinders provided at the two upper and lower portions of the vertical frame 31. The upright posture of the vertical transport mechanism 13 </ b> A is held by being rotatably supported by the shape support member 37. The lower end of the support shaft 36a of the vertical feed screw 36 is inserted into the carry-out case 14 and is linked to the rear end portion of the support shaft 10a of the bottom screw 10 so that the vertical feed screw 36 is driven at the same speed as the bottom screw 10. It has come to be.

  As shown in FIGS. 6 and 10, a communication path R is formed in the lower part of the carry-out case 14 to guide the grains sent out by the bottom screw 10 to the conveyance area of the vertical feed screw 36 in the vertical conveyance mechanism 13 </ b> A. The bottom shape of the carry-out case 14 and the shape of the carry-out port 8f of the grain collection tank 8 are vertically long so that the communication path R has a vertically long shape extended upward from the upper end of the bottom screw 10. Is formed.

  As shown in FIG. 7, the horizontal conveying mechanism 13B of the grain carrying-out device 13 is supported by a conveying case 38 made of a round pipe material having the same diameter as the conveying case 35 of the vertical conveying mechanism 13A. A transverse feed screw 39 provided with a support shaft 39a having a diameter larger than 36a is inserted, and a discharge port 40 opened downward is provided at the tip of the transport case 38. The upper end of the transfer case 35 in the vertical transfer mechanism 13A and the base end portion of the transfer case 38 in the horizontal transfer machine 13B are connected in communication by a connection case 41. The connection case 41 includes an upper end connection case portion 41a fixed to the upper end portion of the transfer case 35 in the vertical transfer mechanism 13A, and a proximal end connection case portion 41b fixed to the proximal end portion of the transfer case 38 in the horizontal transfer mechanism 13B. The base end connection case part 41b is fitted and connected to the upper end connection case part 41a so as to be rotatable around the lateral fulcrum Q, so that the lateral transport mechanism 13B can swing up and down around the lateral fulcrum Q. ing.

  On the lateral fulcrum Q, a relay shaft 42 having both ends supported by the upper end connection case portion 41a and the proximal end connection case portion 41b is provided. The relay shaft 42 is equipped with a feed blade 43 inclined with respect to the lateral fulcrum Q, and both ends of the relay shaft 42 are respectively connected to the upper end of the support shaft 36a in the longitudinal feed clew 36 and the support shaft 39a in the lateral feed screw 39. The bevel gear is linked to the base end of the bevel at a constant speed. As a result, the vertical feed screw 36 and the horizontal feed screw 39 are synchronously driven in conjunction with the rotation of the bottom screw 10, and after the grain delivered from the grain collection tank 8 is lifted by the vertical transport mechanism 13 </ b> A, The paper is horizontally transported by the transport mechanism 13 </ b> B and discharged from the discharge port 40.

  The connecting shaft 41 is inserted into the connecting shaft 41 at a larger diameter than the conveying case 35 of the vertical conveying mechanism 13A and the conveying case 38 of the horizontal conveying mechanism 13B, and the grain obtained by subtracting the cross-sectional area of the relay shaft 42 is used. The cross-sectional area of the passage is set larger than the cross-sectional area of the grain passage obtained by subtracting the cross-sectional area of the support shaft in the vertical transport mechanism 13A, and the cross-sectional area of the grain passage obtained by subtracting the cross-sectional area of the support shaft in the horizontal transport mechanism 13B. The degree of freedom with respect to grain movement in the connection case 41 is large, and grain delivery from the vertical conveyance mechanism 13A to the horizontal conveyance mechanism 13B is smoothly performed without clogging.

  A hydraulic cylinder 45 is installed between the upper end connection case portion 41a fixed to the vertical transfer mechanism 13A and the transfer case 38 of the horizontal transfer mechanism 13B. By the expansion and contraction operation of the hydraulic cylinder 45, the horizontal transfer mechanism 13B is moved to the horizontal axis. The drive swing is made up and down within a predetermined range around the center Q.

  As shown in FIG. 9, an electric motor 46 with a speed reducer is attached to the carry-out case 14 connected and fixed to the lower part of the grain collection tank 8, and a pinion gear 47 that is rotated forward and backward by the speed reduction output. Is engaged with a ring gear 48 that is fixed to the transfer case 36 of the vertical transfer mechanism 13A in a flange shape, so that the whole grain unloading device 13 is driven and swiveled around the vertical fulcrum P by the forward / reverse operation of the electric motor 46. It has become. In this way, the turning position and height position of the discharge port 40 can be moved by turning the grain carrying-out device 13 and swinging the horizontal transport mechanism 13B, and the grain discharging position can be arbitrarily changed. Yes.

Next, a transmission structure to the bottom screw 10 which is a driving shaft for driving the grain carrying-out device 13 will be described.
As shown in FIGS. 13 to 16, a bracket 50 that supports the front end portion of the support shaft 10 a of the bottom screw 10 is fixed to the support plate 15 provided in the lower front portion of the grain collection tank 8. An input case 51 is connected to the front surface of 50. The input case 51 is equipped with an output bevel gear 52 connected to the support shaft 10a and an input bevel gear 53 engaged with the output bevel gear 53, and the input shaft 54 connected to the input bevel gear 53 projects toward the inside of the machine body. Has been.

  The bracket 50 and the input case 51 are connected by abutting the leg portions 50a and 51a, and in the space formed between the leg portions 50a and 51a, an eccentric cam 56 having a bearing 55 mounted on the outer periphery is provided with a bottom screw. Ten support shafts 10a are externally fitted and fixed. The rotating support shaft 12 of the flow guide plate 11 protrudes forward of the support plate 15, and an operation arm 57 connected to the protruding end engages with the bearing 55 of the eccentric cam 56 through the vertically elongated hole 58. Has been. With this configuration, the support shaft 10 a of the bottom screw 10 is rotationally driven and the eccentric cam 56 rotates, so that the operation arm 57 engaged with the eccentric cam 56 has an eccentric amount of the eccentric cam 56. By reciprocatingly swinging with a corresponding amplitude, and the flow guide plate 11 is reciprocally swinging at a predetermined angle, the grains stored in the tank flow down to the working area of the bottom screw 10 without causing a bridge phenomenon. It is like that.

  A bearing bracket 60 is erected on the fuselage frame 2 between the grain collection tank 8 and the engine 4 disposed in front of the grain collecting tank 8, and an input pulley having a lateral axis that is rotatably supported by the bearing bracket 60. The engine power is transmitted to 61.

  As shown in the transmission system diagram of FIG. 5, the engine 4 mounted and deployed sideways includes a main output shaft 62 projecting toward the inside of the machine body and an auxiliary machine driving mechanism projecting toward the outside of the machine body. An output shaft 63 is provided, and the crawler traveling device 1, the mowing unit 3, and the threshing device 7 are driven by the power extracted from the main output shaft 62. The outward output shaft 63 is provided with a three-ply output pulley 64. A transmission belt 65 wound around the output pulley 64 is used for a water pump 66 for cooling the engine, a radiator cooling fan 67, a power generator. The machine 68 is driven, and another transmission belt 69 wound around the output pulley 64 is wound around the input pulley 61. Although not shown, a further transmission belt can be wound around the output pulley 64 so that a refrigerant compression compressor can be driven in an air conditioner equipped in a cabin specification model. It has become.

  In the center of the input pulley 61 that receives engine power as described above, the intermediate transmission shaft 71 is fitted in the spline so as to be slidable in the axial direction. The intermediate transmission shaft 71 is disposed concentrically with the input shaft 54 supported by the input case 51, and the intermediate transmission shaft 71 is slid and biased toward the input shaft 54 by an externally fitted spring 72. ing. The intermediate transmission shaft 71 and the input shaft 54 are interlocked and connected via a meshing clutch 73 at a butt facing portion.

  The clutch 73 includes a boss-like clutch member 74 that is connected and fixed to the distal end portion of the intermediate transmission shaft 71, and an engagement member 75 that is a spring pin that is driven through the outer periphery of the distal end portion of the input shaft 54. As shown in FIG. 13, the engagement member 75 of the input shaft 54 is formed at the opposite end position of the clutch member 74 by fitting the clutch member 74 to the distal end portion of the input shaft 54. The power is transmitted from the intermediate transmission shaft 71 to the input shaft 54 by meshing with the gear 76.

  When the grain collection tank 8 is pivoted from the grain collection position to the maintenance position, the engaging member 75 is removed from the clutch member 74 as the input shaft 54 moves laterally outward, as shown in FIG. The intermediate transmission shaft 71 and the input shaft 54 are disconnected. On the contrary, when the grain recovery tank 8 is returned from the maintenance position to the original grain recovery position, the engaging member 75 moves from the axial direction to the clutch member 74 as the input shaft 54 moves laterally inward. By being engaged, the intermediate transmission shaft 71 and the input shaft 54 are automatically linked together. When the grain recovery tank 8 is turned back from the maintenance position to the grain recovery position, the rotational phase between the engaging recess 76 of the clutch member 74 that has stopped rotating and the engaging member 75 of the input shaft 54 is shifted. In such a case, the engaging member 75 abuts and presses the outer edge of the clutch member 74, and the intermediate transmission shaft 71 slides backward toward the body against the spring 72. Next, when the engine 4 is started and the intermediate rotation shaft 71 starts to rotate, the intermediate rotation shaft 71 is urged and slid when the engagement recess 76 of the clutch member 74 moves to the phase of the engagement member 75, and the clutch 73 is moved. The intermediate rotation shaft 71 and the input shaft 54 are automatically linked and connected.

  As shown in FIGS. 17 to 19, the direction opening width w of the engaging recess 76 is set to be about several times the outer diameter of the engaging member 75, and the depth d of the engaging recess 76 is set to the engaging member. It is set to a degree slightly larger than the outer diameter of 75, and the engagement portion k with the engagement member 75 in the engagement recess 76 is formed in a deepening shape that enters the rotational drive direction. In this way, the engagement recess 76 and the engagement member 75 are bitten and engaged with each other, so that the clutch member 74 moves backward together with the intermediate transmission shaft 71 due to a thrust force generated by a large driving reaction force or the like. It is possible to prevent the engagement with the joint member 75 from being arbitrarily released.

[Other Examples]
(1) Contrary to the embodiment described above, the intermediate transmission shaft 71 may be provided with an engaging member 75 and the input shaft 54 may be provided with a clutch member 74.

  (2) Contrary to the embodiment described above, the intermediate transmission shaft 71 can be made incapable of backward displacement, and the input shaft 54 can be supported by the input case 51 so as to be capable of backward displacement in the axial direction.

  (3) The engaging member 75 in the clutch 73 is constituted by a shear pin that is driven into and fixed to the input shaft 54, and when the driving load of the bottom screw 10 and the grain unloading device 13 becomes excessive, the shear pin is cut to automatically power. It can also be configured such that transmission is interrupted.

  (4) As the meshing form of the clutch 73, a claw meshing specification can be used in addition to the pin meshing specification described above.

Combine side view Side view of grain recovery tank Top view of grain collection tank A perspective view of the grain collection tank as seen from the front inside the aircraft Schematic diagram of transmission system Longitudinal side view showing the linkage structure between the bottom screw and the vertical conveyance mechanism Expanded sectional view showing the linkage structure of the vertical transfer mechanism and the horizontal transfer mechanism Rear view of grain recovery tank The top view which shows the turning drive structure of a grain carrying-out apparatus Rear view showing the unloading part of the grain recovery tank Perspective view showing the rear of the grain recovery tank The perspective view which shows the state by which the movable cover of the grain recovery tank lower part was open | released Cross-sectional plan view showing clutch state of transmission system from engine to bottom screw Cross-sectional plan view showing clutch disengagement state of transmission system from engine to bottom screw Longitudinal side view showing the transmission structure of the front end of the bottom screw Front view showing the drive structure of the flow guide plate Front view seen from the axial direction of the clutch member Cross section of clutch member Development view showing engagement recess in clutch member

Explanation of symbols

4 Engine 8 Grain recovery tank 10 Bottom screw 54 Input shaft 71 Intermediate transmission shaft 73 Clutch 74 Clutch member 75 Engagement member 76 Engagement recess P Vertical support point

Claims (3)

A combine grain drive unit drive structure configured to arrange an engine on the front side of a grain collection tank and transmit engine power to a front end of a bottom screw provided in the grain collection tank,
An intermediate transmission shaft linked to the engine is laterally supported on the front side of the grain collection tank, and the grain collection tank is supported so as to be swingable around a vertical longitudinal fulcrum. A front side of the recovery tank is equipped with a lateral input shaft linked to the front end of the bottom screw facing the body, and the input shaft and the intermediate transmission shaft are concentrically opposed to each other. With a meshing clutch that can be engaged and disengaged from the direction of the rotation axis,
The clutch includes a clutch member that can be displaced backward against a spring biasing force, and an engagement member that is engaged with and disengaged from an engagement recess formed at an end of the clutch member. A combine harvester drive structure for a combine, characterized in that the joint is formed in a deepened shape that enters the rotational drive direction.   The intermediate transmission shaft can be moved in the direction of the rotation axis, and the spring is biased toward the input shaft, and the clutch member is connected to the intermediate transmission shaft and the engagement member is connected to the input shaft. The combine grain recovery unit drive structure according to claim 1.   The combine grain recovery unit drive structure according to claim 2, wherein the engaging member is constituted by a spring pin that is driven and fixed to the input shaft.

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