JP2002104230A - Transmission device of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a shock in steering. SOLUTION: A steering clutch 12 interposed on respective transmission system to right and left traveling devices 1 is provided inside a transmission case 13 of a structure that two split cases 13a are joined. A multi-plate type turning auxiliary clutch CC capable of switch-operating axles 1a of the right and left traveling devices 1 in the downstream of transmission as compared with the steering clutch 12 to an interlocked state and an interlocking-release state is provided inside the transmission case 13. This turning auxiliary clutch CC is constituted such that constitution members can be subsequently assembled to the other split case 13a from an opening of the other split case 13a formed by removing one split case 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission for a working machine such as a combine, and more particularly, to a transmission case having a structure in which two split cases are combined, and a transmission system for each of right and left traveling devices. The present invention relates to a vehicle having a steering clutch interposed therein.

[0002]

2. Description of the Related Art Conventionally, by turning off a steering clutch corresponding to a traveling device on the inside of a turn, the drive of the traveling device on the inside of the turn is cut off, and the traveling device on the inside of the turn and the traveling device on the outside of the turn are disconnected. I had to steer at different speeds.

[0003]

However, according to the above-mentioned prior art, when the running resistance is large, the traveling device inside the turning where the driving is cut off is suddenly braked to generate a large shock. Was.

An object of the present invention is to reduce shock during steering.

[0005]

The features, operations, and effects of the transmission for a working machine according to the first aspect of the present invention are as follows.

[Characteristics] This is a transmission of a working machine in which a transmission case having a structure in which two split cases are combined and a steering clutch interposed in each of the transmission systems for the left and right traveling devices is provided. A multi-plate turning assist clutch operable to switch between a state in which the axles of the left and right traveling devices on the lower transmission side of the steering clutch are interlocked and a state in which the axles are released is provided in the transmission case. Is that the components can be sequentially assembled to the other split case from the opening of the other split case formed by removing one split case.

[Operation] A turning assist clutch is provided, and at the time of turning, the turning assist clutch is gradually switched from an interlocking state to an interlocking disengagement state, whereby the traveling device inside the turning is driven by the traveling device outside the turning. Since the force is gradually reduced, it is possible to prevent the traveling device inside the turn from suddenly stopping due to running resistance during the turn.

In addition, since the turning assist clutch is constructed so that components can be sequentially assembled to the other split case from the opening of the other split case formed by removing one split case, the turning assist clutch is formed. While the auxiliary clutch is provided, the turning assist clutch can be easily assembled.

[Effects] Therefore, it is possible to improve the turning performance by reducing the shock at the time of steering, and to suppress the increase in cost due to the assembly while providing the turning assist clutch for that purpose.

The features, functions and effects of the power transmitting device for a working machine according to the present invention according to claim 2 are as follows.

[Features] In the transmission for a working machine according to the first aspect of the present invention, an axle pivotally supported by one of the left and right axles is rotated by one clutch body of the turning assist clutch. The point is that it is inserted and fitted in the transmission state.

[Operation] Since the axle pivotally supported by one split case is inserted and fitted to one clutch body of the turning assist clutch in a rotation transmitting state, the assembling of the axle can be extended by assembling the turning assist clutch. Can be done as work.

[Effect] Therefore, the axle can be assembled with good workability.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a combine, which is an example of a working machine, includes a boarding operation unit 2, a threshing device 3, and a grain tank provided on a body frame having a pair of right and left crawler traveling devices 1. 4 and on the front of the body frame,
The cutting unit 5 that cuts the planted grain culm and supplies it to the threshing apparatus 2 is swingably connected to the cutting unit 5 so that the cutting unit 5 is raised with the pressurized oil supply and the cutting unit 5 is lowered by its own weight with drainage. The lift cylinder 6 is provided.

As shown in FIG. 2, a transmission system from the engine 7 mounted on the body frame to the traveling device 1 includes:
In order from the power transmission upper side, a belt tension type main clutch 8, a first sub-transmission mechanism 9 for high-low two-speed transmission, a second sub-transmission mechanism 10 for high-low two-speed transmission, and three forward speeds and one reverse speed Device 11, left and right steering clutches 12 and turning assist clutches C which are transmitted specifically to each of the axles 1 </ b> A of the traveling device 1.
C is interposed.

The first auxiliary transmission mechanism 9 and the second auxiliary transmission mechanism 1
The transmission 0, the transmission 11 and the steering clutch 12 are housed in a transmission case 13 in which two split cases 13a are joined together by bolts, and the axle 1A is supported by the transmission case 13.

The main clutch 8 includes a first shaft S that is supported by the output shaft 1a of the engine 7 and the transmission case 13.
It is interposed between one.

The first auxiliary transmission mechanism 9 includes gears 14 and 15
, A large-diameter high-speed transmission gear 17H interlocked with the second shaft S2 via a hydraulically operated high-speed clutch 16H, and a hydraulic pressure on the second shaft S2. By mounting a small-diameter low-speed transmission gear 17L that is interlocked via an operation-type low-speed clutch 16L, the high-speed clutch 16H is engaged against the urging by the supply of pressurized oil to thereby operate via the high-speed transmission gear 17H. It is configured to output high-speed rotation, and to output low-speed rotation via the low-speed transmission gear 17L by engaging the low-speed clutch 16L against the bias by supplying hydraulic oil.

The second auxiliary transmission mechanism 10 is of a manual shift type, and has a small-diameter high-speed passive gear 18 which is always meshed with the high-speed transmission gear 17H on the first shaft S1.
H and a large-diameter low-speed passive gear 18L which is always engaged with and linked to the low-speed transmission gear 17L.
9 is rotatably fitted, and an intermediate transmission gear 20a always meshing with the high-speed passive gear 18H is rotatably mounted on the third shaft S3. The intermediate transmission gear 2
0a, the shifter 22 which is engaged with the low-speed passive gear 18L via the gear 20b by being located in the second shift position is mounted in an integrally rotating state, and
The first output gear 23a for low speed and the second output gear 23b for high speed are mounted in an integrally rotating state, and the shifter 22 is operated to the first shift position to output low speed rotation from the first output gear 23a. By outputting the high-speed rotation from the second output gear 23b and operating the shifter 22 to the second shift position, the low-speed rotation is output from the first output gear 23a, while the high-speed rotation is output from the second output gear 23b. Have been.

The transmission 11 performs a plurality of speed changes by selectively engaging and operating a hydraulically operated clutch C interposed in each of a plurality of transmission paths having different transmission ratios. Specifically, on the fourth shaft S4, a low-speed input gear 24L constantly meshing and interlocking with the first output gear 23a and a high-speed input gear 24H constantly meshing and interlocking with the second output gear 23b are rotatably mounted. At the same time, the main transmission first output gear 25a is mounted in an integrally rotating state, and the fifth shaft S5 is always engaged with the low-speed input gear 24L, that is, the reverse input gear 24R which is reversely linked to the first output gear 23a. And the second output gear 2
3b and a medium-speed input gear 24M which is always meshed and linked, is freely rotatably mounted, and the main transmission second output gear 2M.
5b is mounted integrally with the first speed clutch C1 for engaging the low-speed input gear 24L with the fourth shaft S4 by operating in opposition to the urging with the supply of pressure oil, The third-speed clutch C3 that interlocks the high-speed input gear 24H with the fourth shaft S4 by performing the on-operation against the force.
And a reverse clutch CR that interlocks the reverse input gear 24R with the fifth shaft S5 by operating in opposition to urging with the supply of pressure oil, and engaging in operation against urging with supply of pressure oil. And a second-speed clutch C2 for interlocking the medium-speed input gear 24M with the fifth shaft S5. That is, by engaging only the first-speed clutch C1, the first-speed rotation is output via the first main-gear output gear 25a, and by engaging only the second-speed clutch C2, the second-speed second output gear 25b is activated. By outputting the second-speed rotation through the third gear and by operating only the third-speed clutch C3, the third-speed rotation is output via the first output gear 25a, and only the reverse clutch CR is operated by being engaged. The reverse rotation is output via the second output gear 25b.

The combination of the first auxiliary transmission mechanism 9 and the first auxiliary transmission mechanism 9 performs six forward speeds and two reverse speeds.
When the low-speed clutch 16L is engaged and the first-speed clutch C1 is engaged and activated, the first forward speed state is developed, and the low-speed clutch 16L is engaged and activated.
The second forward speed state is developed by engaging the high speed clutch C2, and the third forward speed state is developed by engaging the low speed clutch 16L and the third speed clutch C3 is engaged, and the high speed clutch 16H is engaged. At the same time, the first-speed clutch C1 is engaged and the fourth-speed forward state is revealed by operating the first-speed clutch C1, and the high-speed clutch 16H is engaged and operated. The third forward clutch C3 is operated and the third forward clutch C3 is engaged and operated to reveal the sixth forward speed state, and the low speed clutch 1
When the reverse clutch CR is engaged and the reverse clutch CR is engaged, the first reverse speed state is exhibited. The high speed clutch 16H is engaged and the reverse clutch CR is engaged.
, The second reverse speed state appears.

The steering clutch 12 includes a clutch portion 12C using a pawl clutch for intermittent transmission and a multi-disc type brake portion 12 located on the lower side of the transmission for braking the traveling device 1.
B), which is a hydraulically operated steering clutch / brake having the transmission case 13 as a cylinder tube and a hydraulic cylinder constructed by incorporating a piston 26 in the transmission case 13 as an actuator. More specifically, as shown in FIG. 3, a sixth gear in which a center gear 27 which is always meshed with and linked to the main transmission first output gear 25a and the main transmission second output gear 25b of the transmission 11 is integrally rotated. The transmission from the shaft S6 to the cylindrical gear 29 interlocking with the final gear 28 mounted on the axle 1A via a spline in an integrally rotating state and axially positioned in the axial direction is intermittently performed, and the cylindrical gear is disengaged in the clutch disengaged state. The clutch 12C is switched from the engaged state to the disengaged state by shifting the cylindrical gear 29 in accordance with the supply of the pressure oil to the cylinder chamber 30 to shift the cylindrical gear 29 from the sixth shaft S6. When the transmission is cut off and the transmission is cut off due to the subsequent supply of pressure oil, the brake portion 12B is braked to brake the cylindrical gear 29. Then, the clutch is returned to the engaged state by the elastic force of the return spring 31 in accordance with the drainage of the oil from the cylinder chamber 30.

The turning assist clutch CC is a hydraulically operated multi-plate clutch which can be switched between a clutch engaged state in which the two axles 1A are interlocked and a clutch disengaged state in which the two axles 1A are released. Is a clutch housing for forming a cylinder chamber, a multi-plate friction interlocking section 35 is interposed between the clutch body c mounted on the other axle 1A and the clutch housing 28, and the multi-plate friction interlocking section 35 is released from the interlocking state. A spring 32 for biasing the
A piston 34 is provided which shifts with the supply of pressure oil to the cylinder chamber 33 and switches the multi-plate friction interlocking portion 35 to a frictional transmission state against the bias. That is, the turning assist clutch CC is incorporated in the final gear, that is, the gear 28 for deceleration transmission, and partially enters the outside of one steering clutch / brake 12 in the axial direction. Are located in In addition, the turning assist clutch C
C, as shown in FIG. 4, is a component that can be sequentially assembled to the other split case 13a from the opening of the other split case 13a formed by removing one split case 13a. Axle 1 supported by split case 13a
A is inserted into the clutch body c of the turning assist clutch CC in a rotationally transmitted state.

As shown in FIG. 5, the speed change operation system among the hydraulic operation systems includes a low speed clutch 16L, a high speed clutch 16H, a first speed clutch C1, and a second speed clutch C from a hydraulic pump 36.
A transmission valve 38 using a rotary valve operated by a transmission lever 37 disposed in the riding section 2 is provided in a pressure oil supply path to the second and third speed clutch C3 and the reverse clutch CR. . The shift valve 38 is provided with a neutral position N in which no pressure oil is supplied to any of the clutches, and a forward first speed position F1 in which pressure oil is supplied to the low-speed clutch 16L and the first-speed clutch C1 to show the first forward speed state. And pressurized oil is supplied to the low-speed clutch 16L and the second-speed clutch C2 to advance
Forward second speed position F2 for displaying the high speed state, and low speed clutch 1
A third forward speed position F3 for supplying pressure oil to the 6L and third speed clutch C3 to display a third forward speed state, and a low speed clutch 16L.
And a reverse first-speed position R1 for supplying pressure oil to the reverse clutch CR and a reverse first-speed state, and high-speed clutches 16H and 16H.
A fourth forward speed position F4 in which the pressure oil is supplied to the speed clutch C1 to display the fourth forward speed state, and a pressure oil is supplied to the high speed clutch 16H and the second speed clutch C2 to display the fifth forward speed state. A forward fifth speed position F5, a forward sixth speed position F6 in which pressure oil is supplied to the high speed clutch 16H and the third speed clutch C3 to display a forward sixth speed state, a high speed clutch 16H and a reverse clutch C
And a second reverse speed position R2 for supplying pressure oil to the R and the second reverse speed state.

As shown in FIG. 5, the steering operation system of the hydraulic operation system includes a steering operation tool 39 arranged in the boarding operation section 2.
The left steering clutch / brake 12 is turned off based on the operation from the straight traveling (neutral) position N to the first left turning first position L1, and the left steering clutch / brake 12 is operated based on the operation toward the left turning second position L2. The steering clutch / brake 12 is operated so as to gradually increase the braking force, and the auxiliary swing clutch C
C is operated so that the clutch pressure gradually decreases, and the left steering clutch / brake 12 is operated to the maximum braking state based on the operation to the left-hand left turning third position L3, and the auxiliary turning clutch CC is operated. While the disengagement operation is performed, the right steering clutch / brake 12 is disengaged and operated based on the operation of the steering operation tool 39 from the straight traveling (neutral) position N to the right turning first position R1, thereby turning the steering wheel 39 further right. On the basis of the operation to the second position R2, the right steering clutch / brake 12 is operated so that the braking force is gradually increased, and the auxiliary swing clutch CC is operated such that the clutch pressure is gradually reduced. The right steering clutch / brake 12 is operated to the maximum braking state and the auxiliary swing clutch CC is disengaged based on the operation of the right turning third position R3. To have.

Specifically, the low-speed clutch 16L, high-speed clutch 16H, first-speed clutch C1, and second-speed clutch C
In order to set the clutch pressure of the second / third speed clutch C3, pressure oil from a relief valve 40 for setting a clutch pressure, which is branched and connected to an oil passage from the hydraulic pump 36 to the shift valve 38, is used to drive the steering clutch / brake 12. A steering valve 41 that operates to control the supply of pressure oil in conjunction with the steering operation tool 39 is interposed in the oil passage to be supplied to the oil supply path. After the clutch is disengaged based on the operation of the steering operation tool 39, Steering clutch / brake 1
A variable relief valve 42 is provided to operate the steering clutch / brake 12 as described above by adjusting the relief pressure from the pressure control valve 2 as described above, that is, to gradually increase the braking force. The pressure reducing valve 43 for reducing the supply pressure to the turning assist clutch CC and operating the turning assist clutch CC as described above is provided. That is, the steering valve mechanism is constituted by the steering valve 41 and the variable relief valve 42.

Therefore, according to this steering operation system, by operating the steering operation tool 39 to the straight traveling position N, the left and right steering clutches / brakes 12 are in a clutch engaged state, and the aircraft advances straight. When the steering operation tool 39 is operated to the left turning first position L1, the left steering clutch / brake 12 is disengaged. In this case, if the traveling load is smaller than the clutch pressure of the turning assist clutch CC, Power is transmitted from the right axle 1A to the left axle 1A via the turning assist clutch CC without slipping, and the left traveling device 1 is driven in the same manner as the right traveling device 1 to go straight. Is larger than the clutch pressure of the turning assist clutch CC, the turning assist clutch CC slips, and the driving force transmitted from the right axle 1A to the left traveling device 1 decreases, so that the traveling speed of the left traveling device 1 is increased. Turns late and turns to the left. Next, the steering operation tool 39 is turned left
When the steering clutch / brake 12 is operated to the position L2, the steering clutch / brake 12 starts braking.
When the traveling load including the braking force of the vehicle is smaller than the clutch pressure of the turning assist clutch CC, the power is transmitted from the right axle 1A to the left axle 1A via the turning assist clutch CC without slipping, and the left traveling is performed. The traveling device 1 on the right side
However, when the traveling load is greater than the clutch pressure of the turning assist clutch CC, the turning assist clutch CC slips and the driving force transmitted from the right axle 1A to the left side to the traveling device 1 is increased. By decreasing the traveling speed, the traveling speed of the traveling device 1 on the left side is slowed, and the vehicle 1 turns left. Further, when the steering operation tool 39 is operated to the left turning third position L3, the left steering clutch / brake 12 is in the maximum braking state, while the turning assist clutch CC is disengaged, and the left traveling device 1 is moved. It stops and makes a sharper left turn than before.

On the other hand, turning to the right is performed in the same manner as described above, except that the left is replaced by the right.

Reference numeral 44 denotes one steering clutch / brake 1
2 which act as a parking brake by actuating the steering valve / brake 12 with the spring 44a to drain the oil when the shift valve 38 is operated to the neutral position. Is operated at a position other than the neutral position, pressure oil is supplied to release the braking. Reference numeral 100 denotes a power take-out shaft to the reaping unit 5, and a first power take-out shaft through a two-stage speed change mechanism 101.
It is interlocked with the sub transmission mechanism 9.

Then, in one of the split cases 13a,
As shown in FIG. 6, the clutch C of the transmission 11, that is, the low speed clutch 16L, the high speed clutch 16H, the first speed clutch C1, the second speed clutch C2, the third speed clutch C3, the reverse clutch CR, and one of the steering clutches Brake 1
8 and 9 are formed.
As shown in FIG. 8, the steering valve 41 and the variable relief valve 42 are incorporated, and the lid 49 corresponding thereto incorporates the relief valve 40 and the pressure reducing valve 43 as shown in FIG. As shown in FIG. 7, an oil path 46 for the other steering clutch / brake 12 and the turning assist clutch CC is formed in the other split case 13a. 7, FIG.
As shown in FIG. 5, a communication oil passage 48 for connecting the oil passages 45 and 46 to each other is formed.

The steering operation tool 39 includes a variable relief valve 42.
The means for interlocking the cam 50 is provided with a cam 50 that changes the relief pressure of the variable relief valve 42 by rotating, and a swing arm 51 that swings in conjunction with the steering operation tool 39 is provided. An arm 53 made of a leaf spring is attached to the shaft 52.
Are mounted so as to swing together, and the arm 53 and the swing arm 51 are linked by a rod 54.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 Transmission system diagram

FIG. 3 is a longitudinal sectional view of a main part of a transmission device.

FIG. 4 is an exploded sectional view of a main part of the transmission;

FIG. 5 is a hydraulic circuit diagram

FIG. 6 is a side view of a transmission case.

FIG. 7 is a side view of a transmission case.

FIG. 8 is a cutaway front view of a main part of the transmission case.

FIG. 9 is a sectional view of a main part of the transmission case.

[Explanation of symbols]

 13a Split case 13 Transmission case 1 Traveling device 12 Steering clutch 1A Axle CC Turning assist clutch c Clutch body

Claims (2)

[Claims] 1. A transmission for a working machine, comprising a transmission case having a structure in which two split cases are combined, and a steering clutch interposed in each of the transmission systems for the left and right traveling devices. A multi-plate turning assist clutch operable to switch between a state in which the axles of the left and right traveling devices on the lower transmission side of the steering clutch are interlocked and a state in which the axles are released from the steering clutch is provided in the transmission case. And a transmission device for a working machine, wherein components can be sequentially assembled to the other split case from an opening of the other split case formed by removing one split case. 2. The work machine according to claim 1, wherein an axle pivotally supported by one of the left and right axles is engaged with one clutch body of the turning assist clutch in a rotation transmitting state. Gearing.