JP2018204635A - Harvester transmission - Google Patents

Abstract

It is desired to reliably separate a driving friction plate and a driven friction plate when a multi-plate friction engagement mechanism is switched to a disengaged state. An engagement state in which drive-side friction plates 32 and driven-side friction plates 31 are alternately arranged and restricts relative rotation between the drive-side friction plate 32 and the driven-side friction plate 31. And a multi-plate frictional engagement mechanism 24 that can be switched between an engagement disengagement state that allows relative rotation, and a friction plate on the drive side in the engagement state between the adjacent friction plates 32 on the drive side. There is provided an elastic member 43 that allows contact between the friction plate 31 on the driven side 32 and the driven friction plate 31 and biases the adjacent driven friction plates 31 apart in the disengaged state. [Selection] Figure 3

Description

  The present invention relates to a transmission device for a harvester used for a harvester such as a combine harvester or a corn harvester.

  In many cases, a crawler type traveling device is used for the harvesting machine, and turning is performed by changing the driving speed of the traveling device. In such a harvester, a multi-plate friction engagement mechanism such as a multi-plate friction brake or a multi-plate friction clutch is used. Conventionally, in a multi-plate type side brake, which is an example of a multi-plate friction engagement mechanism, a plurality of annular drive-side friction plates that are externally fitted to a rotary shaft so as to be integrally rotatable, and the casing cannot be rotated. The driven friction plates and the driven friction plates are alternately arranged, and the drive-side friction plates and the driven-side friction plates are moved by an annular moving member that slides along the axial direction of the rotating shaft by the hydraulic pressure and the return force of the spring. It is configured to be switchable between an engagement state that restricts relative rotation with the friction plate and an engagement release state that allows relative rotation (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2006-94958

  In the above-described conventional configuration, as the moving member slides toward the multi-plate friction engagement mechanism, the adjacent friction plate on the driving side and the friction plate on the driven side come into close contact with each other, so that they are in friction engagement. Thus, the state is switched to a braking state for braking the rotating shaft. Further, as the moving member slides to the opposite side of the multi-plate friction type engagement mechanism, the adjacent drive side friction plate and the driven side friction plate are allowed to be separated from each other. The friction engagement is released, and the brake is released to release the braking of the rotating shaft.

  However, in the above-described conventional configuration, when the moving member slides to the opposite side of the multi-plate frictional engagement mechanism, the adjacent drive-side friction plate and driven-side friction plate are simply allowed to separate. Therefore, even when the moving member reaches the end position on the disengagement side, the adjacent friction plate on the driving side and the friction plate on the driven side may be in close contact with each other. In such a state, when the rotation shaft starts rotating, the braking force (friction engagement force) remaining between the closely contacting drive-side friction plate and the driven-side friction plate is an extra resistance as a follow-up torque. Inconvenience occurs.

  Therefore, it is desired to reliably separate the drive-side friction plate and the driven-side friction plate when the multi-plate friction type engagement mechanism is switched to the disengaged state.

The characteristic configuration of the transmission device for the harvester according to the present invention is as follows:
The drive-side friction plate and the driven-side friction plate are alternately arranged, and the engagement state that restricts the relative rotation between the drive-side friction plate and the driven-side friction plate and the relative rotation are allowed. A multi-plate frictional engagement mechanism that can be switched to a disengaged state is provided,
Any one of the drive-side friction plate and the driven-side friction plate is used as a target friction plate, and the drive-side friction plate and the driven are in the engaged state between adjacent target friction plates. There is an elastic member that allows contact with the friction plate on the side and biases the adjacent target friction plates apart in the disengaged state.

  According to the present invention, in the engaged state, the relative rotation of the drive side friction plate and the driven side friction plate is restricted, so that the power transmission that transmits power is possible if the driven side friction plate rotates. If the driven friction plate is fixed, the braking state can be set to brake the rotation of the driving friction plate. In the disengaged state, relative rotation between the drive side friction plate and the driven side friction plate is allowed, so that the power cut-off state or the non-braking state (free rotation state) can be set. Switching between the engaged state and the disengaged state is performed, for example, by an operation using an actuator or a manual operation.

  In the disengaged state, an elastic member is provided between adjacent friction plates on the driving side or between adjacent friction plates on the driven side. The elastic member is elastically deformed in the engaged state, thereby allowing contact between the driving friction plate and the driven friction plate. The elastic member is biased so that adjacent target friction plates are separated from each other in the disengaged state. As a result, the adjacent target friction plates are reliably separated from each other, so that the drive-side friction plate and the driven-side friction plate do not adhere to each other.

  As a result, in the disengaged state, the adjacent drive-side friction plate and the driven-side friction plate are surely separated from each other, thereby avoiding disadvantages such as generation of accompanying torque and excessive resistance. Became possible.

  In the present invention, it is preferable that the elastic member is attached to an outer peripheral side portion of the target friction plate.

  For example, if the elastic member is attached to the inner peripheral portion of the target friction plate, it is pushed by the urging force so that the inner peripheral portion of the target friction plate is separated, but the outer peripheral side of the target friction plate is cantilevered. There is a possibility that the friction plates are not properly separated due to bending and deformation.

  Therefore, in this configuration, the elastic member is attached to the outer peripheral side portion of the target friction plate. With this configuration, the urging force by the elastic member acts on the outer peripheral side portion of the target friction plate, so that the urging force easily acts on the entire target friction plate to separate the friction plates from each other.

  In the present invention, the target friction plate is provided with a locking portion that protrudes radially outward and is locked to a locking member for rotation prevention located on the outer peripheral side, and the elastic member is provided on the locking portion. Preferably it is attached.

  According to this configuration, the engaging portion to which the elastic member is attached protrudes radially outward from the contact action region where the driving friction plate and the driven friction plate are in contact with each other. In other words, the elastic member can be attached without narrowing the contact action area where the driving side friction plate and the driven side friction plate are in contact with each other by using the locking portion protruding in the radially outward direction. it can.

  In the present invention, the elastic member spans between the adjacent target friction plates and biases the biasing so as to separate the target friction plates between the adjacent target friction plates. It is preferable that each of the target friction plates on both sides is attached in a state of having a portion.

  According to this configuration, the elastic member is attached to each of the target friction plates on both sides, and the biasing portion is provided between the target friction plates. There are no disadvantages such as no longer being applied, and the target friction plates are always urged to be separated appropriately.

In the present invention, a mounting hole is formed in the target friction plate,
The elastic member is attached in a state of passing through the attachment holes of the adjacent target friction plates,
A first biasing portion that is positioned between the target friction plates adjacent to the elastic member and biases the target friction plates away from each other;
It is located outside the adjacent target friction plates in the alignment direction so that the adjacent target friction plates are separated from the other target friction plates positioned outward in the alignment direction. It is preferable that a second urging portion is provided.

  According to this configuration, since the elastic member is attached to the target friction plate in a state of penetrating the attachment hole, it is not necessary to separately use a member for attachment, and the attachment structure is simplified. The elastic member can separate the adjacent target friction plates from each other by the biasing force of the first biasing portion, and the outer side of the target friction plate to which the elastic member is attached by the biasing force of the second biasing portion. The other target friction plates located on the side can be separated from each other.

  As a result, since each of the plurality of target friction plates provided in the multi-plate friction type engagement mechanism can be separated from each other, all the friction plates on the driving side and the friction plates on the driven side in the disengaged state. Adjacent ones can be reliably separated.

  In the present invention, a plurality of drive-side friction plates and a plurality of drive-side friction plates are obtained by connecting adjacent target friction plates with the other friction plate interposed between adjacent target friction plates. It is preferable that the plurality of driven friction plates are assembled in a unit shape.

  According to this configuration, adjacent target friction plates are connected to each other using an elastic member with the other friction plate interposed therebetween, and assembled in a unit shape to the apparatus. Can be installed. As a result, it is possible to perform the work efficiently with less trouble as compared with the case where a plurality of friction plates on the driving side and a plurality of friction plates on the driven side are separately mounted.

It is a whole side view of a combine. It is a longitudinal cross-sectional view of a transmission mechanism. It is a longitudinal cross-sectional view of the principal part in a transmission mechanism. It is a longitudinal cross-sectional view of a side brake. It is a partial longitudinal cross-sectional view of a side brake. It is a perspective view of a separator plate. It is an expanded sectional view of a plurality of separator plates. It is an expanded sectional view of a plurality of separator plates of another embodiment. It is an expanded sectional view of a plurality of separator plates of another embodiment.

  Hereinafter, a case where an embodiment of a transmission device for a harvesting machine according to the present invention is applied to an ordinary combine will be described with reference to the drawings.

  FIG. 1 shows an ordinary combine that harvests rice or wheat. This combine is provided with a traveling machine body equipped with a pair of left and right crawler traveling devices 2 at the lower part of the machine frame 1, and harvested planted cereals to be harvested at the front part of the traveling machine body and conveyed backward. The conveyance unit 3 is connected to be swingable up and down around the horizontal axis. And the threshing apparatus 4 and the threshing apparatus 4 which perform a handling process with respect to the threshing cereal from the harvesting conveyance part 3 on the body frame 1, and perform a selection process with respect to the threshing processed material obtained by the handling process. Tank 5 for storing the grains from the grain, grain discharging device 6 for discharging the grains stored in the grain tank 5 to the outside of the machine, the driving unit 7 on which the operator gets on and operates Is provided.

  The operation part 7 is located on the right side of the front part of the machine body, and the grain tank 5 is located behind the operation part 7. The threshing device 4 and the grain tank 5 are arranged in the left-right direction with the threshing device 4 located on the left side and the grain tank 5 located on the right side. A driving engine 8 is provided below the operation unit 7, and the power of the engine 8 is transmitted to each unit.

  The cutting and conveying unit 3 divides the planted cereals into planted cereals that are to be harvested and planted cereals that are not to be harvested, and the planted cereals that are to be harvested. Rotating reel 10 scraped toward the rear, clipper-shaped cutting device 11 for cutting the planted side of the planted culm to be harvested, and collecting the chopped cereal after cutting at a predetermined position on the center side in the left-right direction And a feeder 13 that conveys the harvested cereal meal toward the threshing device 4 and the like. The cutting and conveying section 3 is supported by a hydraulic cylinder (not shown) so as to be swingable up and down around the horizontal axis.

  Although not described in detail, the threshing device 4 is configured to handle the harvested cereals conveyed from the feeder 13 and then sort the processed products into grains, second products, waste straws, and the like. Yes. The grain is stored in the grain tank 5, and after the harvesting operation, the grain stored in the grain tank 5 is discharged out of the machine by a grain discharging device 6 including a screw conveyor having a known structure.

[Transmission mechanism]
A mission case 15 having a transmission device that transmits driving force to the left and right crawler traveling devices 2 is provided at a central position in the left-right direction at the front position of the traveling machine body. As shown in FIG. 2, a hydrostatic continuously variable transmission 16 is connected to the upper portion of the transmission case 15, and is connected to the continuously variable transmission 16 via a belt transmission mechanism and a transmission shaft 14 (not shown). The driving force of the engine 8 is transmitted, and the driving force from the continuously variable transmission 16 is transmitted to the transmission mechanism in the mission case 15.

  As shown in FIG. 2, the gear transmission type sub-transmission device 18 that shifts the power from the output shaft 17 of the continuously variable transmission 16 in three stages of high speed, medium speed, and low speed, and the relay transmission gear from the sub transmission 18. The power from the left and right side clutch brakes 20 transmitted via the pair of left and right side clutch brakes 20 and the input gear 22a is selectively transmitted to the left and right crawler travel devices 2 after the shift. A pair of left and right speed reduction mechanisms 22 that transmit the speed to the left and right travel drive shafts 21 are provided.

  Each side clutch brake 20 includes a meshing side clutch 23 for intermittently transmitting power from the relay transmission gear 19 to the corresponding crawler traveling device 2, and a multi-plate side brake (multiple brake) for braking the corresponding crawler traveling device 2. An example of a plate friction type engagement mechanism) 24 is provided.

  The left side clutch brake 20 acts on the left crawler travel device 2 via the left speed reduction mechanism 22 and the left travel drive shaft 21, and the right side clutch brake 20 is connected to the right speed reduction mechanism 22 and the right side. It is comprised so that it may act on the crawler traveling apparatus 2 on the right side via the traveling drive shaft 21.

  When the traveling machine body travels straight, the left and right side clutches 23 are engaged together, and the pair of left and right crawler traveling devices 2 are rotationally driven at the same speed. Further, when turning, the side clutch 23 corresponding to the crawler traveling device 2 inside the turning is switched to the disengaged state, the rotational speed is reduced, and the vehicle slowly turns, or the side brake corresponding to the crawler traveling device 2 inside the turning. It is possible to make a sudden turn with the brake 24 in a braking state.

  As shown in FIG. 3, each side clutch 23 is externally fitted in a state of being spline-fitted to the outer peripheral portion of the cylindrical shaft 26, which is externally fitted to the clutch transmission shaft 25 so as to be relatively rotatable. The moving side rotating body 27 provided with the engagement portion 27A at the end, the driving side rotation body 28 fitted with the spline to the clutch transmission shaft 25 and provided with the engagement portion 28A, the engagement portion 27A and the engagement portion 28A are engaged. A compression spring 29 that urges the moving side rotating body 27 toward the position is provided. The cylindrical shaft 26 includes a gear 30 that meshes with the input gear 22 a of the speed reduction mechanism 22 on the outer peripheral portion.

  When the moving side rotating body 27 slides to the entry position by the action of the compression spring 29, the moving side rotating body 27 is switched to a transmission state in which the meshing portion 27A of the moving side rotating body 27 and the engaged portion 28A of the driving side rotating body 28 are engaged. In addition, by sliding to the cutting position against the action of the compression spring 29, the meshing portion 27A of the moving side rotating body 27 and the meshed portion 28A of the driving side rotating body 28 are brought into a blocking state in which the meshing is released. Switch.

  When the side clutch 23 is switched to the transmission state, the power transmitted to the clutch transmission shaft 25 via the relay transmission gear 19 is transmitted to the driving side rotating body 28, the moving side rotating body 27, the cylindrical shaft 26, the speed reduction mechanism 22, And it is transmitted to the travel drive shaft 21, and the crawler travel device 2 is driven.

  Each side brake 24 includes a plurality of annular brake discs 32 (an example of a drive-side friction plate) that are externally fitted in a state of fitting with the gears 30, and a plurality of annular separator plates that are alternately arranged with the brake discs 32. (An example of a driven friction plate) 31, a brake housing 34 that supports the outer peripheral portion of the separator plate 31 and the like are provided. On the laterally outer side of the plurality of separator plates 31, a moving side rotating body 27 is provided in a state where it can be pressed.

  As shown in FIG. 5, a protruding portion 30 </ b> A is formed on the outer side end portion in the left-right direction of the gear 30 formed on the cylindrical shaft 26 so as to protrude slightly outward in the radial direction from the other portions. The protrusion 30A is formed to have a slightly larger diameter than the tooth bottom of the brake disk 32, and the brake disk 32 can be prevented from coming off when the brake disk 32 is assembled.

  As shown in FIG. 3, the transmission case 15 allows the brake disc 32, the separator plate 31, and the like to pass through the left and right side walls of the transmission case 25 facing each side clutch brake 20 in the axial direction of the clutch transmission shaft 25. A permissible opening 15A is formed. A cover member 35 that closes the opening 15A is detachably attached by bolt connection. A brake housing 34 is integrally formed on the inner side of the opening 15 </ b> A in the mission case 15.

  The left and right cover members 35 are each provided with an auxiliary opening 35A that allows the drive-side rotating body 28 to pass therethrough, and an auxiliary cover member 36 that closes the auxiliary opening 35A is detachably attached by bolt connection. Each auxiliary opening 35 </ b> A is formed in a circular shape centering on the axis of the clutch transmission shaft 25. Each auxiliary cover member 36 includes a large-diameter portion 36 </ b> A that fits inside the auxiliary opening 35 </ b> A, and a small-diameter portion 36 </ b> B that forms an annular oil chamber 37 between the cover member 35. And the bearing 38 which supports the edge part of the transmission shaft 25 for clutches is provided in the inside of the small diameter part 36B.

  Between the inner periphery of the cover member 35 and the outer periphery of the small-diameter portion 36B of the auxiliary cover member 36, an annular piston 39 that slides the moving side rotating body 27 is provided. Is supplied, the piston 39 slides in the axial direction of the clutch transmission shaft 25. By sliding the piston 39, the corresponding moving side rotating body 27 is slid in the axial direction of the clutch transmission shaft 25 to switch the side clutch 23 to the disconnected state and to switch the side brake 24 to the braking state. It is configured as follows. The pressure oil is controlled by a hydraulic control valve (not shown) based on the operation of the turning operation lever 42.

  As shown in FIGS. 4 and 6, a locking portion 40 that protrudes radially outward and is locked to a brake housing 34 as a locking member for rotation prevention located on the outer peripheral side is provided on the outer peripheral side portion of the separator plate 31. Is provided. Six locking portions 40 are formed at equal intervals in the circumferential direction in a state of extending integrally from the separator plate 31.

  An engagement groove 41 having a shape corresponding to the locking portion 40 is formed on the inner peripheral side of the brake housing 34 that houses the separator plate 31, and the locking portion 40 enters and engages with the engagement groove 41. The rotation of the separator plate 31 is restricted.

  When pressure oil is supplied to the annular oil chamber 37 and the piston 39 presses, the moving side rotating body 27 is moved to the left and right center side, and presses the plurality of separator plates 31 and the brake disc 32, thereby The state is switched to a braking state (an example of an engaged state) in which the plate 31 and the brake disc 32 are pressed against each other. In addition, when the pressure oil supply is stopped and the pressing operation to the left and right center side of the moving side rotating body 27 is stopped, the operation is switched to the braking release state by the action of the compression spring 29. In FIG. 3, in order to facilitate understanding of the operation, the left side in the drawing represents a brake released state (engaged state), and the right side represents a brake state (engaged state). In the braking release state, the side clutch 23 is in the transmission state, and in the braking state, the side clutch 23 is in the disconnected state.

  As shown in FIGS. 3, 6, and 7, the separator plate 31 and the brake disk are elastically deformed by the pressing force of the piston 39 between the adjacent separator plates 31 (an example of the target friction plate) in the engaged state. In the disengaged state, the separation operating body 43 (an example of an elastic member) that returns to the original state and separates the adjacent separator plates 31 from each other in the disengaged state. ) Is provided.

  As shown in FIG. 6, the separation operating body 43 is made of rubber, which is an example of an elastic body, and is attached to a locking portion 40 located on the outer peripheral side portion of the separator plate 31. The separation operating body 43 extends between the adjacent separator plates 31 and includes a biasing portion F that biases the separator plates 31 between the adjacent separator plates 31 so as to separate them. Attached to each of the separator plates 31.

  In other words, an attachment hole 44 is formed in a state of being inserted into the locking portion 40 of the separator plate 31, and the separation operating body 43 is attached in a state of passing through the attachment holes 44 of the adjacent separator plates 31. Yes. The separation operating body 43 has a substantially cylindrical shape, and is provided with a central large-diameter portion 45 at the central portion in the longitudinal direction, and is fitted in the attachment holes 44 of the separator plate 31 on both longitudinal sides of the central large-diameter portion 45. A small diameter portion 46 is provided. An end-side large-diameter portion 47 having a diameter larger than that of the small-diameter portion 46 is provided on the longitudinal direction end side of the small-diameter portions 46 on both sides.

  Since the separation operating body 43 can be elastically deformed, it is inserted into the attachment hole 44 of the separator plate 31 from the end side while being elastically deformed, and as shown in FIG. It can be mounted in a state of being fitted in the mounting hole 44. By attaching the separation operating body 43 in this manner, the biasing portion F that biases the central large-diameter portion 45 so as to separate the separator plates 31 adjacent to each other is configured. Further, the end-side large-diameter portions 47 at both ends in the longitudinal direction can be prevented from coming off.

  A plurality of separation operating bodies 43 are respectively attached to six locking portions 40 formed at equal intervals in the circumferential direction on the outer peripheral portion of the separator plate 31. A mounting structure of the separation operating body 43 will be described. As shown in FIGS. 4 and 7, every other locking portion (I, III, FIG. 7) of the six locking portions 40 arranged in the circumferential direction in a state where the two separator plates are adjacent to each other. The separation operating body 43 is attached at three locking portions 40) of V. Further, the remaining three locking portions 40 (three locking portions 40 of II, IV, and VI in FIG. 7) are adjacent to one separator plate 31 of one set (two sheets) of separator plates 31. A separation operating body 43 is attached in a state extending over one separator plate 31 of the set. FIG. 7 shows a cross-sectional view of a state in which a plurality of separator plates 31 are developed in the circumferential direction.

  Therefore, the adjacent separator plates 31 are connected to each other by the separation operating body 43 at the three locking portions 40 that are separated from each other by substantially equal intervals (120 degrees) in the circumferential direction. Therefore, a plurality of (eight in the example shown in FIG. 3) are connected by connecting the two separator plates 31 with the separation operating body 43 with the brake disk 32 sandwiched between the two separator plates 31. ) Separator plate 31 and a plurality (seven of them) of brake discs 32 are assembled in a unit. When assembled to the airframe, it is possible to mount the separator plate 31 and the plurality of brake discs 32 on the brake housing 34 in a state of being assembled in a unit shape.

  As the order of assembly, with the cover member 35 removed, the assembly in which the plurality of separator plates 31 and the plurality of brake disks 32 are assembled in a unit shape is first mounted on the brake housing 34, and then the cylinder The shaft 26, the moving side rotating body 27, etc. are mounted. After mounting, the brake disc 32 and the like can be prevented from coming off by the protrusion 30A formed on the gear 30 of the cylindrical shaft 26.

[Another embodiment]
(1) The separation operating body 43 (elastic member) may be configured as follows.
As shown in FIG. 8, the first biasing portion F <b> 1 that is positioned between adjacent separator plates 31 and biases the separator plates 31 apart from each other, and the alignment direction of the adjacent separator plates 31 are arranged. And a second urging portion F2 that urges the adjacent separator plates 31 to be separated from the other separator plates 31 located on the outer side in the arrangement direction. .

  If the explanation is added, the difference from the above embodiment is that the separation operating body 43 is such that the length in the axial direction of the end-side large-diameter portion 47 provided on both ends in the longitudinal direction is the center-side large-diameter portion. The length is substantially the same as the length of 45. The central large-diameter portion 45 constitutes the first biasing portion F1, and the end-side large diameter portion 47 constitutes the second biasing portion F2. With this configuration, the adjacent separator plates 31 can be separated from each other by the urging force of the first urging portion F1, and the urging force of the second urging portion F2 can be moved outward on both sides in the arrangement direction. It can be separated from the other separator plate 31 located.

Further, the separation operating body 43 (elastic member) may be configured as follows.
As shown in FIG. 9, the center-side large-diameter portion 45 constitutes the first urging portion F1, and the end-side large-diameter portion 47 constitutes the second urging portion F2. However, the end-side large-diameter portion 47a on one end side in the arrangement direction has substantially the same length as the central-side large-diameter portion 45, and the end-side large-diameter portion 47b on the other end side has a short shape. It is. In this embodiment, the long end portion large diameter portion 47a and the short end portion large diameter portion 47b are in contact with and separated from the other separator plates 31 located on the outer sides on both sides in the arrangement direction. be able to.

(2) In the above embodiment, the separation operating body 43 (elastic member) is attached to the engaging portion 40 located on the outer peripheral side portion of the target friction plate (separator plate 31). And it is good also as a structure attached to the radial direction inner side location of an object friction board.

(3) In the above-described embodiment, the separation operating body 43 (elastic member) is attached in a state of passing through the attachment holes 44 of the adjacent target friction plates (separator plates 31). In addition, the configuration may be such that the target friction plate (separator plate 31) is attached to the side surface of the target friction plate (separator plate 31).

(4) In the above embodiment, the separation operating body 43 (elastic member) is attached to the separator plate 31 as a target friction plate. However, instead of this configuration, the separation operating body 43 (elastic member) is attached to the brake disk 32 as a target friction plate. It is good also as a structure.

(5) In the above embodiment, the multi-plate friction engagement mechanism is applied to the multi-plate brake 24. However, the multi-plate friction clutch may be applied instead of this configuration.

  The present invention can be applied to a transmission device for a harvester used in a harvester such as a combine or a corn harvester.

24 Multi-plate friction type engagement mechanism 31 Friction plate on the driven side (target friction plate)
32 Driving friction plate 34 Locking member 40 Locking portion 43 Elastic member 44 Mounting hole F Biasing portion F1 First biasing portion F2 Second biasing portion

Claims (6)

The drive-side friction plate and the driven-side friction plate are alternately arranged, and the engagement state that restricts the relative rotation between the drive-side friction plate and the driven-side friction plate and the relative rotation are allowed. A multi-plate frictional engagement mechanism that can be switched to a disengaged state is provided,
Any one of the drive-side friction plate and the driven-side friction plate is used as a target friction plate, and the drive-side friction plate and the driven are in the engaged state between adjacent target friction plates. A harvester transmission device provided with an elastic member that allows contact with a friction plate on the side and biases the adjacent target friction plates apart in the disengaged state.   The transmission device for a harvester according to claim 1, wherein the elastic member is attached to an outer peripheral side portion of the target friction plate. The target friction plate is provided with a locking portion that protrudes radially outward and locks to a locking member for rotation prevention located on the outer peripheral side,
The harvesting device transmission according to claim 2, wherein the elastic member is attached to the locking portion.   The elastic member extends between adjacent target friction plates, and includes a biasing portion that biases the target friction plates so as to separate the target friction plates between the adjacent target friction plates. The transmission device for a harvester according to any one of claims 1 to 3, wherein the transmission device is attached to each of the target friction plates on both sides. A mounting hole is formed in the target friction plate,
The elastic member is attached in a state of passing through the attachment holes of the adjacent target friction plates,
In the elastic member,
A first biasing portion that is positioned between the adjacent target friction plates and biases the target friction plates away from each other;
It is located outside the adjacent target friction plates in the alignment direction so that the adjacent target friction plates are separated from the other target friction plates positioned outward in the alignment direction. The transmission device for a harvester according to any one of claims 1 to 3, further comprising a second urging portion that urges the urging force.   By connecting the adjacent target friction plates with the other friction plate interposed between the adjacent target friction plates, a plurality of the driving side friction plates and the plurality of driven sides are connected. The transmission device for a harvester according to any one of claims 1 to 5, wherein the friction plates are assembled in a unit shape.

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