JP2016102528A - Transmission operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a state in which a pushing operation against a power interrupting mechanism is carried out well without increasing a manual operating amount to be kept for a long period of time.SOLUTION: This invention comprises: the first slide member 46 rotatable around a rotating shaft axis and slidable along the rotating shaft axis; the second slide member 47 prevented for rotation around the rotating shaft axis and slid along the rotating shaft axis direction to enable a power interrupting mechanism 24 to be pushed; the first cam mechanism 48 for moving the first slide member 46 along the rotating shaft axis direction and sliding toward the power interrupting mechanism 24 as the first slide member 46 rotates around the rotating shaft axis; and the second cam mechanism 49 for moving the second slide member 47 along the rotating shaft axis direction as the first slide member 46 is rotated around the rotating shaft axis and moving it in slide motion along the rotating shaft axis direction toward the power interrupting mechanism 24.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a transmission operating device for operating a frictional power interrupting mechanism.

  For example, in a work vehicle such as a combine vehicle, a multi-plate friction type parking brake as a friction type power interrupting mechanism is provided inside a transmission case, and the configuration for operating the parking brake is configured as follows. It was.

  That is, an annular slide member that pushes and operates the parking brake along the rotation axis direction is provided in a state of being supported by the transmission case so as to be slidable along the rotation axis direction. A cam mechanism including an engaging ball and a cam groove along the circumferential direction is provided between the end surface on one side and the inner surface of the transmission case. Then, when the slide member is rotated around the rotation axis by the operation member operated in accordance with the operation of the brake pedal, the slide member slides along the rotation axis by the action of the cam mechanism, and the parking brake. (See, for example, Patent Document 1).

JP 2012-62973 A

  In the above configuration, the sliding amount in the direction of the rotation axis accompanying the rotation of the sliding member, that is, the maximum pushing operation amount of the frictional power interrupting mechanism (parking brake) by the sliding member is the moving amount by which the ball is pushed up by the cam groove. In other words, it corresponds to the outer diameter of the ball.

  The frictional power interrupting mechanism has a large amount of pushing operation required to switch the intermittent state of the power interrupting mechanism due to wear of the friction plate of the power interrupting mechanism with long-term use. May change. As a result, in the above configuration, even if the ball is climbed up to the end of the cam groove, the actual push operation amount due to the cam mechanism may be less than the required push operation amount. In this state, there is a disadvantage that even if the slide member is rotated, the power interrupting mechanism cannot be switched properly. Further, as a result of the lack of the operation stroke in the slide member, the ball may come off from the cam groove, and the cam function may not be satisfactorily achieved.

  In order to avoid such disadvantages, it is conceivable to use a large-diameter ball to increase the pushable range by the action of the cam mechanism. Even in the case of using such a large-diameter ball, the cam groove inclination angle cannot be so large. Therefore, if the amount of rotation of the slide member is the same, the actual amount of push operation due to the action of the cam mechanism is approximately The same. Therefore, in order to increase the push operation amount with respect to the power interrupting mechanism, the slide member has to be largely rotated, and there is a disadvantage that the manual operation amount becomes large and the operation becomes difficult.

  Therefore, it has been desired to maintain a state in which the push operation to the power interrupting mechanism can be favorably performed for a long time without increasing the manual operation amount.

The characteristic configuration of the transmission operating device according to the present invention includes a fixed member that is prevented from rotating around the rotation axis of the frictional power interrupting mechanism and sliding along the rotation axis.
A first slide member that is located between the fixed member and the power interrupt mechanism in the direction of the rotation axis, is rotatable around the rotation axis, and is slidable along the direction of the rotation axis;
The power is positioned between the first slide member and the power interrupting mechanism in the direction of the rotation axis, is prevented from rotating around the rotation axis, and slides along the direction of the rotation axis to move the power. A second slide member that can be operated by pushing the intermittent mechanism;
A rotation operation member capable of rotating the first slide member around the rotation axis;
While being positioned between the fixed member and the first slide member, the first slide member is moved along the direction of the rotation axis as the first slide member rotates around the rotation axis. A first cam mechanism that slides toward the power interrupt mechanism;
The second slide member is positioned between the first slide member and the second slide member, and the second slide member is moved in the direction of the rotation axis as the first slide member rotates around the rotation axis. And a second cam mechanism that slides toward the power interrupting mechanism side.

  According to the present invention, when the first slide member is rotated around the rotation axis by the operation of the rotation operation member, the first slide member is moved relative to the fixed member by the cam action of the first cam mechanism. Then, it slides to the power interrupting mechanism side along the rotation axis direction. Further, when the first slide member is rotated around the rotation axis, the second slide member moves along the rotation axis with respect to the first slide member due to the cam action of the second cam mechanism. Slide to the power interrupt mechanism.

  By rotating the first slide member, the first slide member slides relative to the fixed member, and the second slide member slides relative to the first slide member. That is, even if the amount of rotation operation of the first slide member is not increased so much, the second slide member is a power interrupting mechanism corresponding to the total amount of movement of the first slide member and the second slide member. It slides greatly to the side and pushes and operates the power interrupting mechanism.

  By being pushed by the second slide member, for example, the power interrupting mechanism switched to the power transmission state by the biasing means is switched to the transmission cutoff state, or switched to the power cutoff state by the biasing means. The power interrupting state of the power interrupting mechanism is switched, for example, the energized power interrupting mechanism is switched to the power transmission state.

  As described above, even if the amount of rotation of the first slide member is not large, the amount of movement of the second slide member can be increased. Even if the required push operation amount changes to the large side due to wear of the plate or the like, the push operation to the power interrupting mechanism by the second slide member can be performed satisfactorily.

  Accordingly, it has become possible to maintain a state in which the push operation to the power interrupting mechanism can be favorably performed for a long time without increasing the amount of manual operation.

In the present invention, the first cam mechanism includes an engagement groove formed in each of the fixing member and the first slide member, and a ball that enters and engages each of the engagement grooves.
It is preferable that the second cam mechanism includes an engagement groove formed in each of the first slide member and the second slide member, and a ball that enters and engages with each of the engagement grooves. is there.

  According to this configuration, each of the first cam mechanism and the second cam mechanism is configured by a ball-type cam mechanism including an engagement groove and a ball. Since such a ball-type cam mechanism exhibits a smooth guiding action with little sliding resistance, it is possible to smoothly perform a pushing operation on the power interrupting mechanism accompanying the rotation of the first slide member. In addition, since the amount of rotation of the first slide member is not so large with respect to the amount of movement of the second slide member, a margin for the amount of operation of the second slide member can be taken as much, and wear of the friction plate can be reduced. Even if the required pressing operation amount changes to the large side due to the cause, there is no disadvantage such as the ball coming out of the engaging groove, and a favorable operation can be performed.

  In the present invention, it is preferable that the first cam mechanism and the second cam mechanism are provided at positions having different phases in the rotation direction of the first slide member.

  According to this configuration, the first cam mechanism and the second cam mechanism have different phases along the rotation direction. Therefore, in the first slide member, the first cam mechanism and the second cam mechanism are arranged along the rotation axis direction. The first cam mechanism and the second cam mechanism do not interfere even if the width along the rotational axis direction of the first slide member is reduced.

  Therefore, even if it is the structure which piles up a plurality of members along the direction of a rotation axis, and is provided with the 1st cam mechanism and the 2nd cam mechanism on both sides of the 1st slide member, It is possible to reduce the width of one slide member along the rotational axis direction and to make it compact.

In the present invention, an engagement groove is formed in each of the fixing member and the second slide member, and an insertion hole is formed in the first slide member to be inserted from the fixed member side toward the second slide member side. And two balls are inserted into the insertion hole in a state of protruding outward,
The first cam mechanism is configured by a ball located on the fixed member side of the two balls and an engagement groove formed in the fixed member,
It is preferable that the second cam mechanism is constituted by a ball located on the second slide member side of the two balls and the engagement groove formed in the second slide member.

  According to this configuration, the first slide member is formed with an insertion hole, and two balls are inserted into the insertion hole. The two balls are provided so as to protrude outward. At the protruding portion, the ball engages with an engagement groove formed on the fixing member, and the rotation of the first slide member occurs. A first cam mechanism is configured to slide the second slide member along with the movement. On the second slide member side, the second cam mechanism is configured such that the ball engages with an engagement groove formed in the second slide member, and the second slide member slides as the first slide member rotates. Configure.

  According to the above configuration, the first cam mechanism and the second cam mechanism are provided, and the push operation to the power interrupting mechanism can be performed satisfactorily, but the first slide member is simply formed by forming an insertion hole. It can be handled by processing, for example, compared to a configuration in which engagement grooves (cam grooves) are separately formed on the fixed member side and the second slide member side with respect to the first slide member. By reducing the cost, it becomes possible to reduce the cost.

  In the present invention, the second slide member engages with the fixed member via a linkage mechanism that allows sliding movement along the direction of the rotation axis and prevents rotation around the rotation axis. It is preferable that they are linked.

  According to this configuration, the second slide member is engaged with the fixed member via the linkage mechanism in a state where the rotation around the rotation axis is prevented and the second slide member is supported slidably along the rotation axis. Be linked. By configuring in this way, for example, the support structure is simplified and the processing effort is reduced compared to a configuration in which the second slide member is separately supported by a fixed portion such as a transmission case.

  In the present invention, the fixing member is positioned on the side opposite to the first slide member and fixed to the transmission case, and rotates around the rotation axis with respect to the first fixing portion. A second fixing portion that is freely movable; and a first state in which the first fixing portion and the second fixing portion are connected and fixed; and the connection between the first fixing portion and the second fixing portion is released. It is preferable that a connecting member capable of changing the state to a second state in which the second fixing portion and the first slide member are connected and fixed is provided.

  According to this configuration, when the connecting member is changed to the first state in which the first fixing portion and the second fixing portion are connected and fixed, the first fixing portion and the second fixing portion are respectively fixed to the transmission case, The rotation around the rotation axis and the sliding movement along the rotation axis direction are prevented. When the first slide member is rotated in this first state, the second slide member is moved by the action of the first cam mechanism and the second cam mechanism while the first fixing portion and the second fixing portion are fixed. Push and operate the power interrupt mechanism.

  When the connecting member is changed to the second state in which the second fixing portion and the first slide member are connected and fixed, the first fixing portion is fixed to the transmission case to rotate around the rotation axis and in the direction of the rotation axis. Although the state where the sliding movement is prevented is maintained, the second fixing portion is connected and fixed to the first slide member, so that the rotation around the rotation axis is allowed. When the first slide member is rotated in this second state, the first slide member and the second fixing portion rotate integrally around the rotation axis while the first fixing portion is fixed. At this time, since the first slide member is connected and fixed to the second fixing portion, the first slide member rotates around the rotation axis, but sliding movement along the rotation axis is prevented. As a result, the second slide member slides by the action of only the second cam mechanism, and pushes and operates the power interrupting mechanism.

  By switching the connecting member between the first state and the second state, the push operation amount for the power interrupting mechanism can be changed in two steps even if the rotation operation amount for the first slide member is the same. For example, in the initial stage of use, the state of the connecting member is set to a state where the amount of pushing operation is small, and when the power interrupting mechanism is worn with long-term use, the state of the connecting member is increased to a state where the amount of pushing operation is large. By switching the state, it is possible to maintain a state where the push operation can be performed satisfactorily for a long time.

In the present invention, a power interrupting unit that supports the power interrupting mechanism is provided on the outer periphery of a transmission shaft integrally connected with a power transmission gear, so as to be rotatable around the axis of the transmission shaft,
The power interrupting unit is supported in a state in which one end portion in the axial direction is close to the transmission gear, and is rotated integrally with the transmission shaft in accordance with the power interrupting of the power interrupting mechanism and the transmission shaft. Is supported to be able to switch to a state of relative rotation with respect to
It is preferable that a thrust bearing is interposed between one end portion in the axial direction of the power interrupting unit and the transmission gear.

  According to this configuration, the power transmission mechanism is provided along the direction of the rotation axis by disposing the power interrupting unit provided in the outer periphery of the transmission shaft so as to be rotatable around the axis of the transmission shaft in a state close to the transmission gear. Can be arranged compactly.

  The power transmitted to the transmission shaft via the power transmission gear is transmitted to the lower transmission side via the power interrupting unit, but the power is transmitted when the power interrupting unit rotates together with the transmission shaft. When the rotation relative to the transmission shaft is reached, the power is cut off. And since the thrust bearing is interposed between the axial direction one side edge part of a power intermittence unit, and a transmission gear, they are made to adjoin and compactly arrange, but a power intermittence unit and a transmission gear When they are in a state of relative rotation, they can be prevented from sliding and causing wear.

It is a whole side view of an ordinary combine. It is a vertical front view of a transmission mechanism. It is a side view which shows the linkage mechanism for brake operation. It is a partially longitudinal front view of a transmission mechanism. It is a partially longitudinal front view of a transmission mechanism. It is a vertical side view of a cam mechanism. It is the VII-VII sectional view taken on the line of FIG. It is a vertical side view of a cam mechanism. It is the IX-IX sectional view taken on the line of FIG. It is a disassembled perspective view of the operating device for transmission. It is sectional drawing of the cam mechanism of another embodiment. It is sectional drawing of the cam mechanism of another embodiment. It is a vertical side view of the cam mechanism of another embodiment. It is the XIV-XIV sectional view taken on the line of FIG. It is sectional drawing of the cam mechanism of another embodiment. It is sectional drawing of the cam mechanism of another embodiment.

  Hereinafter, the case where the embodiment of the transmission operating device according to the present invention is applied to a normal 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 unit 3 is supported by the hydraulic cylinder 14 so as to be movable 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 is finished, the grain stored in the grain tank 5 is discharged out of the machine by a grain discharging device 6 which is a screw type conveying device having a well-known structure.

[Transmission mechanism]
A mission case 15 as a transmission case for transmitting driving force to the left and right crawler traveling devices 2 is disposed at the center position in the left-right direction at the front portion position of the traveling machine body. As shown in FIG. 2, a hydrostatic continuously variable transmission 16 is connected to the top of the transmission case 15, and the driving force of the engine 8 is transmitted to the continuously variable transmission 16, so that the continuously variable transmission 16 Is transmitted to the transmission mechanism inside the mission case 15.

  As shown in FIG. 2, the transmission case 15 includes a gear-shifting sub-transmission device 18 that shifts power from the output shaft 17 of the continuously variable transmission 16 in three stages of high speed, medium speed, and low speed. A pair of left and right side clutch brakes 20 for selectively transmitting the shifted power transmitted from the device 18 via the relay transmission gear 19 to the left and right crawler traveling devices 2, and the left and right side transmitted via the input gear 22a A pair of left and right speed reduction mechanisms 22 that transmit power to the left and right travel drive shafts 21 after decelerating the power from the clutch brake 20 are provided.

  As shown in FIG. 4, each side clutch brake 20 brakes the corresponding crawler traveling device 2 and the meshing side clutch 23 that intermittently transmits power from the relay transmission gear 19 to the corresponding crawler traveling device 2. A multi-plate type side brake 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 acts on the right speed reduction mechanism 22 and the right travel speed. The crawler travel device 2 on the right side is configured to act on the 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. Also, when turning based on the operation of a turning operation lever (not shown), the side clutch 23 corresponding to the crawler traveling device 2 inside the turning is switched to the shut-off state to reduce the rotational speed and turn slowly, The side brake 24 corresponding to the crawler traveling device 2 can be brought into a braking state to make a sharp turn.

  As shown in FIG. 4, each side clutch 23 has a cylindrical shaft 26 that is externally fitted to the clutch transmission shaft 25, a spline externally fitted to the cylindrical shaft 26, and a meshing portion 27 </ b> A at one end in the axial direction. A moving-side rotating body 27, a fixed-side rotating body 28 having a meshed portion 28A, a compression spring 29 that urges the moving-side rotating body 27 toward a position where the meshing portion 27A and the meshed portion 28A mesh with each other, A circlip 40 or the like for holding the moving side rotating body 27 biased by the compression spring at the entering position is provided.

  Then, when the moving side rotating body 27 slides to the entry position by the action of the compression spring 29, the meshed portion 27A of the moving side rotating body 27 and the engaged portion 28A of the fixed side rotating body 28 are brought into a transmission state. Switch. In addition, by sliding to the cutting position against the action of the compression spring 29, the engagement portion 27A of the moving-side rotating body 27 and the engaged portion 28A of the fixed-side rotating body 28 are switched to a shut-off state in which the engagement is released. It is comprised so that it may replace.

  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 fixed 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 of the left and right side brakes 24 includes a plurality of separator plates 31 fitted around a brake hub 30 that rotates integrally with the cylindrical shaft 26, a plurality of separator plates 31 and a plurality of brake disks 32 that are alternately arranged in the axial direction. A single pressure plate 33 and a brake housing 34 for supporting them are provided.

  When the movable rotating body 27 is moved to the left and right center side by a hydraulic operation as will be described later, the plurality of separator plates 31 and the brake disc 32 are pressed through the pressure plate 33, and the plurality of separator plates 31 and the brakes are pressed. The disc 32 is switched to a braking state in which the disc 32 is pressed. Further, when the movement operation of the moving side rotating body 27 to the left and right center side is stopped, the operation is switched to the brake release state by the action of the compression spring 29. In FIG. 4, for easy understanding, in the drawing, the left side represents the braking release state, and the right side represents the braking state. The side brake 24 is provided so as to be rotatable around the axis of the clutch transmission shaft 25 in the brake released state.

  Therefore, the left and right side brakes 24 are in a state in which the brake hub 30 and the separator plate 31 are allowed to rotate around the axis of the clutch transmission shaft 25 in the brake released state, and in the brake state, the side clutch 23 is After the switching to the shut-off state, the plurality of separator plates 31 and the brake disc 32 are pushed through the pressure plate 33 and exert a braking action on the corresponding crawler traveling device 2.

  The transmission case 15 has a separator plate 31, a brake disc 32, and members that constitute the side brake 24 at locations facing the side clutch brakes 20 in the axial direction of the clutch transmission shaft 25 on the left and right side walls. An opening 15A that allows passage of the pressure plate 33 and the like is formed. A cover member 35 that closes the opening 15A is detachably attached and fixed by bolt connection.

  When a plurality of members constituting the side brake 24 as described above are mounted, the power interrupting unit 41 configured in a unit shape with the side brake 24 being supported is mounted through the opening 15A. That is, the clutch power transmission shaft 25 is passed through the opening 15A through the power interrupting unit 41 in which the cylindrical shaft 26, the brake hub 30, the compression spring 29, the moving side rotating body 27, the circlip 40 for holding the position, etc. Attach to.

  The power interrupting unit 41 is supported in a state in which one end portion in the axial center direction is close to the relay transmission gear 19, and in a state where the power interrupting unit 41 rotates integrally with the clutch transmission shaft 25 as the power of the side brake 24 is interrupted. It is supported so that it can be switched to a state of rotating relative to the transmission shaft 25. A thrust bearing 43 is interposed between one axial end of the power interrupting unit 41 and the relay transmission gear 19. That is, as shown in FIG. 5, the cylindrical shaft 26 and the brake hub 30 are recessed in the axial direction across the cylindrical shaft 26 and the brake hub 30 at the inner shaft end portions of the cylindrical shaft 26 and the brake hub 30 facing the relay transmission gear 19. A circumferential groove 44 is formed, and a thrust bearing 43 is mounted in a state of entering the circumferential groove 44, and is supported in a state of contacting the relay transmission gear 19 through the thrust bearing 43.

  Each of the left and right cover members 35 includes an auxiliary opening 35A that allows passage of the stationary rotating body 28, 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. When pressure oil is supplied to the annular oil chamber 37, the piston 39 slides in the axial direction of the clutch transmission shaft 25. By this sliding, 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. The pressure oil supply / discharge control for the oil chamber 37 is performed by a hydraulic control valve (not shown) based on the operation of the turning operation lever.

[Parking brake]
Of the pair of left and right side brakes 24, the right side brake 24 (an example of a frictional power interrupting mechanism) is configured to function as a parking brake. Even when the engine 8 is stopped, the right side brake 24 can maintain the state by switching the left and right crawler travel devices 2 to the braking state by human operation.

That is, the right side brake 24 is linked to the brake pedal 42 via a mechanical linkage mechanism.
As shown in FIG. 5, the transmission case 15 is located between the right cover member 35 and the right side brake 24, and can be freely rotated around the rotation axis of the clutch transmission shaft 25. A first slide member 46 slidable along the axial direction, and positioned between the first slide member 46 and the side brake 24 in the rotational axis direction, and is prevented from rotating about the rotational axis; A second slide member 47 is provided that slides along the rotational axis direction and is capable of pushing and operating the side brake 24. The cover member 35 functions as a fixed member K in which the rotation of the clutch transmission shaft 25 around the rotation axis and the sliding movement along the rotation axis are prevented.

  Also, a braking operation shaft 45 as a rotation operation member that can freely rotate the first slide member 46 around the rotation axis, a first cam mechanism 48 positioned between the cover member 35 and the first slide member 46, A second cam mechanism 49 is provided between the first slide member 46 and the second slide member 47.

  As shown in FIGS. 6, 7, and 10, the first cam mechanism 48 includes engagement grooves 70 and 71 formed in the cover member 35 and the first slide member 46, and the engagement grooves 70 and 71, respectively. And a ball 72 that enters and engages with each other. As the first slide member 46 rotates about the rotation axis, the first slide member 46 moves toward the side brake 24 along the rotation axis direction. Has the function of sliding.

  The second cam mechanism 49 includes engagement grooves 73 and 74 formed in the first slide member 46 and the second slide member 47, and a ball 75 that enters and engages with the engagement grooves 73 and 74, respectively. The first slide member 46 has a function of sliding the second slide member 47 to the side brake 24 side along the rotation axis direction as the first slide member 46 rotates around the rotation axis.

  In other words, as shown in FIG. 5, a storage opening 35 </ b> B having a larger diameter than the auxiliary opening 35 </ b> A is formed on the inner peripheral side of the cover member 35 on the side brake 24 side. As shown in FIGS. 6 and 10, the first slide member 46 is formed in a ring shape. The ring-shaped first slide member 46 is supported so as to be slidable along the inner peripheral surface of the storage opening 35 </ b> B of the cover member 35. The second slide member 47 is formed in a ring shape and is slidable on the inner peripheral surface of the brake housing 34 and a large-diameter portion 47A that is slidably fitted to the inner peripheral surface of the cover member 35. And a small-diameter portion 47B that fits inside.

  As shown in FIG. 10, in the cover member 35, the step portion 35C between the portion where the auxiliary opening 35A is formed and the portion where the storage opening 35B is formed, and the step portion 35C opposite to the step portion 35C in the axial direction. Five engagement grooves 70 and 71 are formed on the end surface 46 </ b> A on the cover member 35 side of the one slide member 46 in a state of being distributed and arranged at equal intervals in the circumferential direction. Each of the engagement grooves 70 and 71 is formed in an inclined shape such that the engagement depth becomes shallower on one side in the circumferential direction, and constitutes a guide cam surface. In addition, five balls 72 made of steel balls entering and engaging with the engaging grooves 70 and 71 formed in the cover member 35 and the first slide member 46 are provided, and the engaging grooves 70 and 71 are respectively provided. The first cam mechanism 48 is configured by the balls 72.

  The first slide member 46 opposite to the cover member 35, that is, the end surface 46B on the side brake 24 side, and the end surface 47C on the cover member 35 side of the second slide member 47 are respectively spaced at an appropriate interval in the circumferential direction. The engagement grooves 73 and 74 are formed. Each of the engagement grooves 73 and 74 is formed in an inclined shape such that the engagement depth becomes shallower on one side in the circumferential direction. Further, five balls 75 made of steel balls entering and engaging with the engaging grooves 73 and 74 formed in the cover member 35 and the first slide member 46 are provided, and the engaging grooves 73 and 74 are respectively provided. The second cam mechanism 49 is configured by the balls 75.

  That is, the first slide member 46 is formed with engagement grooves 71 and 73 on the end surface 46A on the cover member 35 side and the end surface 46B on the side brake 24 side, respectively. As shown in FIG. 7, the engagement grooves 71 and 73 in the first slide member 46 are formed in the same phase in the circumferential direction so as to overlap in the radial direction.

The second slide member 47 is engaged and linked to the cover member 35 via a linkage mechanism R that allows sliding movement along the rotation axis direction and prevents rotation around the rotation axis.
As shown in FIG. 10, an engagement convex portion 76 that protrudes radially outward is formed on a part of the outer peripheral portion of the second slide member 47 in the circumferential direction. Further, an engagement recess 77 that engages with the engagement protrusion 76 and prevents rotation around the rotation axis is formed at a position corresponding to the engagement protrusion 76 in the cover member 35. The width of the engaging recess 77 along the circumferential direction is substantially the same as the width of the engaging protrusion 76, and the width along the axial direction is set large over a predetermined width. As a result, the second slide member 47 is configured to be prevented from rotating around the rotation axis and to be slid along the axis direction. That is, the engagement convex portion 76 and the engagement concave portion 77 constitute the linkage mechanism R.

  As shown in FIG. 5, the braking operation shaft 45 is rotatably fitted and supported in an insertion hole 78 formed in the cover member 35 with an axis parallel to the axial direction of the clutch transmission shaft 25. ing. As shown in FIG. 6, an operation surface 45 a is formed at a shaft end portion on the inner side of the braking operation shaft 45 by cutting out a part so as to be substantially semicircular when viewed in the axial direction. . In addition, a concave contact surface 46 </ b> C is formed in a part of the first slide member 46 in the circumferential direction.

  As shown in FIGS. 6 and 8, when the braking operation shaft 45 rotates, the operation force from the operation surface 45a is transmitted to the contact surface 46C of the first slide member 46, and the first slide member 46 is moved. It can be rotated around the rotation axis.

  Since the cover member 35 and the second slide member 47 are respectively prevented from rotating around the rotation axis, when the first slide member 46 is rotated, as shown in FIG. By the action of 48 and the second cam mechanism 49, the first slide member 46 and the second slide member 47 are respectively slid toward the right side brake 24 side. That is, when the first slide member 46 is rotated, the ball 72 in the first cam mechanism 48 rides on the engagement grooves 70 and 71 to slide the first slide member 46 with respect to the cover member 35, and The ball 75 in the two-cam mechanism 49 rides on the engaging grooves 73 and 74 and slides the first slide member 46 with respect to the cover member 35.

  The amount of movement of the second slide member 47 relative to the cover member 35 is a slide operation toward the side brake 24 in a state where the slide movement amount by the first cam mechanism 48 is added in addition to the slide movement amount by the second cam mechanism 49. Will be.

  As shown in FIG. 3, outside the transmission case 15, one end is integrally connected to the brake pedal 42, and the balance swinging arm is swingable around the axis of the lateral rotation support shaft 53. 54, the operation rod 56 linked to the other end of the balance swinging arm 54 via a compression spring 55 for absorbing the stroke, the brake pedal 42 and the balance swinging arm 54 are returned to the depressed release position and biased. A return spring 57 is provided.

  When the brake pedal 42 is depressed from the depression release position indicated by the solid line in FIG. 3 to the depression position indicated by the phantom line in FIG. The operating rod 56 is pulled upward, and the linkage arm 52 swings from the braking release position (OFF) to the braking position (ON). The braking operation shaft 45 rotates forward in conjunction with the operation, and the first slide member 46 rotates forward in conjunction with the forward rotation (see FIG. 8). When the first slide member 46 rotates forward, the second slide member 47 slides in the right direction in FIG. 5 along the rotation axis direction. Then, the pressure plate 33 is pressed, and the right side brake 24 is switched from the brake release state to the brake state.

  At the time of braking operation of the right side brake 24, the vehicle body is stopped traveling and no turning operation is performed, so that the left and right side clutches 23 are engaged. As a result, the right side brake 24 acts on the left and right crawler traveling devices 2 to exert a braking force.

  When the depressing operation of the brake pedal 42 is released, the braking operation shaft 45 is reversely rotated by the urging force of the return spring 57 in conjunction with the operation, the pressure against the pressure plate 33 is released, and the right side brake 24 is braked. Switch from the state to the brake release state.

  When the brake pedal 42 is depressed to an area exceeding the braking position, a lock mechanism 58 is provided to maintain this depressed state. The lock mechanism 58 includes a lock plate 60 that is swingably supported around a shaft body 59 that is in a lateral orientation, and a lock operation arm 61 that is coupled to the lock plate 60. An engagement recess 62 is formed in the lock plate 60, and a lock pin 63 that can be freely engaged with and disengaged from the engagement recess 62 protrudes from a side surface of the brake pedal 42.

  Although not shown, a release spring for urging the lock plate 60 in the release direction is provided. When the lock pin 63 is engaged with the engagement recess 62 and the lock operation arm 61 is released, the brake pedal 42 is maintained at the braking position by the engagement action by the urging force of the release spring.

  When releasing the braking state by the right side brake 24, the engagement recess 62 is detached from the lock pin 63 by the operation of the lock operation arm 61, and the brake pedal 42 is moved to the non-operation position by the urging force of the return spring 57. It returns and the braking force is also released.

[Another embodiment]
(1) In the above-described embodiment, the first cam mechanism 48 and the second cam mechanism 49 are formed in the same phase in the rotation direction of the first slide member 46. As shown in FIG. 11, the first cam mechanism 48 and the second cam mechanism 49 may be provided at different positions in the rotational direction of the first slide member 46. By comprising in this way, the thickness along the axial center direction of the 1st slide member 46 can be decreased, and the transmission operating device can be made compact.

(2) In the above embodiment, a configuration is shown in which the engagement grooves 71 and 73 are formed on the end surface 46A on the cover member 35 side and the end surface 46B on the second slide member 47 side of the first slide member 46, respectively. However, instead of this configuration, the following configuration may be used.

  That is, as shown in FIG. 12A, the point that the engagement grooves 70 and 74 are formed in the cover member 35 and the second slide member 47 is the same as that in the above embodiment, but the first slide member 46. A through hole 80 is formed through the cover member 35 side to the second slide member 47 side. Two balls 72 and 75 are inserted into the insertion hole 80 so as to protrude outward. The first cam mechanism 48 is configured by the ball 72 located on the cover member 35 side of the two balls 72 and 75 and the engagement groove 70 formed in the cover member 35, and the first cam mechanism 48 is formed. The second cam mechanism 49 is configured by the ball 75 positioned on the second slide member 47 side and the engagement groove 74 formed in the second slide member 47.

  Then, as shown in FIG. 12B, when the first slide member 46 is rotated, the two balls 72 and 75 in the insertion hole 80 come into contact with each other, and the first projecting portion protrudes outward. Guided along the engagement grooves 70 and 74 of the first cam mechanism 48 and the second cam mechanism 49, the first slide member 46 and the second slide member 47 slide in the axial direction. According to this configuration, the first slide member 46 can be easily processed, and the manufacturing cost can be reduced.

(3) In the above embodiment, the cover member 35 fixed to the transmission case 15 is provided as the fixed member K. However, instead of this structure, the following structure may be used.

  As shown in FIGS. 13 and 14, the fixing member K is located on the side opposite to the first slide member 46 and fixed to the transmission case (mission case 15), and the first fixing portion 81. A second fixed portion 82 that can be rotated around the rotation axis, and a first state in which the first fixed portion 81 and the second fixed portion 82 are connected and fixed, and the first fixed portion 81 and the second fixed portion 82 It is a structure provided with the connection member which cancels | releases connection with the 2 fixing | fixed part 82, and can change a state to the 2nd state which connects and fixes the 2nd fixing | fixed part 82 and the 1st slide member 46. FIG.

  If it demonstrates, the 1st fixing | fixed part 81 will be connected and fixed to the mission case 15 similarly to the cover member 35 in the said embodiment, although rotation is not shown in figure, rotation around a rotating shaft center, and a rotating shaft core direction Is prevented from sliding along. Further, although not shown, the second fixing portion 82 is rotatable around the rotation axis and is prevented from sliding along the direction of the rotation axis.

  Pin insertion holes 84, 85, and 86 are formed along the rotational axis direction in each of the first slide member 46, the first fixing portion 81, and the second fixing portion 82. A connecting pin 83 as a connecting member is fitted in these pin insertion holes 84, 85, 86 so as to be mounted.

  The connecting pin 83 is different in the fitting state, so that it is fitted into the pin insertion holes 85 and 86 of the first fixing portion 81 and the second fixing portion 82 (see FIG. 14), and the first slide member. 46 and the second state (see FIG. 13) in which the pin is inserted into the pin insertion holes 84 and 85 of the first fixing portion 81 so that the state can be changed.

  In the first state, since the first fixing portion 81 is prevented from rotating by the connecting pin 83, as the first slide member 46 is rotated, as in the above embodiment, FIG. As shown in FIG. 5, the first slide member 46 and the second slide member 47 are respectively slid toward the right side brake 24 by the action of the first cam mechanism 48 and the second cam mechanism 49.

  In the second state, the first fixing portion 81 rotates integrally with the first slide member 46, but cannot slide in the direction of the rotation axis, so as shown in FIG. 13 (b), the first slide As the member 46 is rotated, the second slide member 47 is slid toward the right side brake 24 by the action of the second cam mechanism 49. That is, in this second state, the slide movement amount of the second slide member 47 is half that in the first state.

(4) In the above embodiment, as the linkage mechanism R that engages and links the second slide member 47 and the fixing member K, the engagement recess 77 formed in the cover member 35 and the outer periphery of the second slide member 47 are provided. Although the structure provided with the formed engagement convex part 76 was shown, it may replace with this structure and may be comprised as follows.

  As shown in FIGS. 15 and 16, pin insertion holes 87 and 88 are formed in the second slide member 47 and the cover member 35, respectively, along the rotational axis direction. A round bar-like connecting pin 89 is fitted and attached to these pin insertion holes 87 and 88. However, the second slide member 47 is linked and supported by the connection pin 89 so as to be slidable along the rotation axis direction. Therefore, the linkage mechanism R is configured by the pin insertion holes 87 and 88 and the connecting pin 89, and the second slide member 47 is allowed to slide along the rotation axis direction and rotate around the rotation axis. It is blocked.

  The connecting pin 89 is provided in a state where the first slide member 46 is inserted through a long hole 90 formed long in the circumferential direction. The first slide member 46 can be rotated around the rotation axis by the amount corresponding to the accommodation of the long hole 90, and the second slide is accompanied by the rotation operation of the first slide member 46 as in the above embodiment. The member 47 can be slid toward the side brake 24 side.

(5) Although the thrust bearing 43 is interposed between the power interrupting unit 41 and the relay transmission gear 19 in the above embodiment, a thrust collar may be provided instead of the thrust bearing 43.

(6) In the above-described embodiment, the case where one of the pair of left and right side brakes 24 functions as a parking brake is described as a frictional power interrupting mechanism. Not only the configuration but also various configurations can be used.
For example, a dedicated parking brake provided separately from the pair of left and right side brakes 24 may be used, or a power transmission clutch mechanism for intermittently transmitting the driving force may be used instead of the brake. Good.

(7) Although what was applied to the combine was shown in the said embodiment, not only a combine but the present invention can be applied to various working machines, such as a tractor and a rice transplanter.

  The present invention can be applied to a transmission operating device for operating a frictional power interrupting mechanism such as a friction brake or a friction clutch.

DESCRIPTION OF SYMBOLS 15 Transmission case 19 Transmission gear 24 Power interruption mechanism 25 Transmission shaft 41 Power interruption unit 43 Thrust bearing 45 Rotation operation member 46 1st slide member 47 2nd slide member 48 1st cam mechanism 49 2nd cam mechanism 70,71 Engagement Groove 72 ball 73, 74 engagement groove 75 ball 81 first fixing portion 82 second fixing portion 83 connecting member K fixing member R linkage mechanism

Claims (7)

A fixed member that is prevented from rotating around the rotational axis of the frictional power interrupting mechanism and sliding movement along the rotational axis;
A first slide member that is located between the fixed member and the power interrupt mechanism in the direction of the rotation axis, is rotatable around the rotation axis, and is slidable along the direction of the rotation axis;
The power is positioned between the first slide member and the power interrupting mechanism in the direction of the rotation axis, is prevented from rotating around the rotation axis, and slides along the direction of the rotation axis to move the power. A second slide member that can be operated by pushing the intermittent mechanism;
A rotation operation member capable of rotating the first slide member around the rotation axis;
While being positioned between the fixed member and the first slide member, the first slide member is moved along the direction of the rotation axis as the first slide member rotates around the rotation axis. A first cam mechanism that slides toward the power interrupt mechanism;
The second slide member is positioned between the first slide member and the second slide member, and the second slide member is moved in the direction of the rotation axis as the first slide member rotates around the rotation axis. A transmission operating device comprising: a second cam mechanism that slides toward the power interrupting mechanism along the second cam mechanism. The first cam mechanism includes an engagement groove formed in each of the fixing member and the first slide member, and a ball that enters and engages with each of the engagement grooves.
The said 2nd cam mechanism is provided with the engagement groove | channel formed in each of the said 1st slide member and the said 2nd slide member, and the ball | bowl which penetrates and engages with each of these engagement grooves. The transmission operating device described.   The transmission operating device according to claim 1 or 2, wherein the first cam mechanism and the second cam mechanism are provided at positions having different phases in a rotation direction of the first slide member. An engagement groove is formed in each of the fixing member and the second slide member,
An insertion hole is formed in the first slide member so as to be inserted from the fixed member side toward the second slide member side, and two balls are inserted in a state of protruding outward in the insertion hole,
Of the two balls, the first cam mechanism is configured by a ball located on the fixing member side and the engagement groove formed in the fixing member.
The said 2nd cam mechanism is comprised by the ball located in the said 2nd slide member side of the said two balls, and the said engaging groove formed in the said 2nd slide member. Transmission operating device.   The second slide member is engaged and linked to the fixed member via a linkage mechanism that allows sliding movement along the direction of the rotation axis and prevents rotation around the rotation axis. Item 5. The transmission operating device according to any one of Items 1 to 4. The fixing member is positioned on the opposite side of the first slide member and fixed to the transmission case, and the first fixing portion is rotatable about the rotation axis with respect to the first fixing portion. 2 fixed parts,
A first state in which the first fixing portion and the second fixing portion are connected and fixed, and the connection between the first fixing portion and the second fixing portion is released, and the second fixing portion and the first slide are released. The transmission operating device according to claim 1, further comprising a connecting member capable of changing a state to a second state in which the member is connected and fixed. A power interrupting unit that supports the power interrupting mechanism is provided on the outer periphery of a transmission shaft integrally connected with a power transmission gear, so that the power interrupting unit is rotatable around the axis of the transmission shaft.
The power interrupting unit is supported in a state in which one end portion in the axial direction is close to the transmission gear, and is rotated integrally with the transmission shaft in accordance with the power interrupting of the power interrupting mechanism and the transmission shaft. Is supported to be able to switch to a state of relative rotation with respect to
The transmission operating device according to any one of claims 1 to 6, wherein a thrust bearing is interposed between one end portion in the axial direction of the power interrupting unit and the transmission gear.

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