JPH079737Y2 - Combine side clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a combine side clutch device.

(Prior Art) In a combine transmission, a crawler is driven with a shift section including a sub-transmission section and a main transmission section that has a plurality of gears and switches the power transmission path thereof to perform a plurality of gear shifts. A crawler drive shaft is provided, and a steering side clutch is provided between the drive shaft and the speed change unit, and by this clutch, connection / disconnection of the transmission path between the speed change unit and the crawler drive shaft and the drive It is configured to perform braking of the shaft.

By the way, a side clutch provided in the combine as described above has conventionally been disclosed in "Power transmission mechanism in a power vehicle" of Japanese Utility Model Laid-Open No. 58-35469.
In this, the power of the driven wheel is first shut off by the fork member, and then the driven wheel is braked. Specifically, the operating lever for the side clutch provided in the driver's seat operates the fork member via the operating wire and the link member, and the foam member places the driven side wheel body in the power cutoff position to cut off the power. . Further, by operating the lever, the connecting rod pulls the operation wire for controlling the control valve of the piston device, thereby delaying the operation of the piston device for braking.

(Problems to be solved by the invention) However, if the side clutch is operated via the link mechanism composed of the operation wire, the link member, etc. as described above, the link mechanism can be operated during long-term use. Twisting or rusting may occur in each connecting part of the multiple link members or the operating wire connecting them, which makes it difficult to transmit the operating force (poor transmission efficiency), and the operating load is correspondingly increased. There has been a problem that it becomes heavy and the operability deteriorates. In the worst case, the connecting rod may be damaged by excessive force and the braking may not work.

Further, because of these problems, the timing of the operation of the fork member that sets the driven wheel to the power cutoff position and the operation of the piston device that brakes the driven wheel are deviated,
There is a possibility that a malfunction may occur in which braking is applied while the driven wheel is being driven.

The present invention was devised in view of the above problems, and the operation can be performed stably for a long period of time with a small force, and the timing of cutting off the power to the crawler drive shaft and the braking operation of the drive shaft. It is an object of the present invention to provide a combine side clutch device in which the timings of and are never reversed.

(Means for Solving Problems) In order to achieve the above object, a combine side clutch device according to the present invention includes a clutch means for turning on and off an output from a speed change portion to a crawler drive shaft, and a piston for operating the clutch means. And a first hydraulic actuator composed of a cylinder, and oil corresponding to the operation amount of the operating lever is supplied to the first hydraulic actuator.
The oil supply means for supplying to the cylinder of the hydraulic actuator, the braking means for braking the crawler drive shaft, and the second hydraulic actuator composed of the piston and the cylinder for operating this braking means, and the piston of the first hydraulic actuator The hole provided on the side surface of the cylinder in the sliding stroke is communicated with the cylinder of the second hydraulic actuator, and the piston of the first hydraulic actuator moves by hydraulic pressure, and then the oil is supplied to the cylinder of the second hydraulic actuator. Configured to.

(Operation) In the combine side clutch device having the above configuration,
When the operation lever is operated, for example, in the clutch disengagement direction, oil corresponding to the operation amount is supplied from the oil supply means to the cylinder of the first hydraulic actuator. Then, the piston of the first hydraulic actuator moves by the hydraulic pressure to operate the clutch means, and shuts off the output from the transmission unit to the crawler drive shaft. When the operating lever is further operated in the same direction, the piston of the first hydraulic actuator moves, and oil is supplied to the cylinder of the second hydraulic actuator from the hole provided on the side surface of the cylinder, and the hydraulic pressure causes the second hydraulic actuator to move. The piston of the actuator moves to actuate the braking means and brake the crawler drive shaft.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the combine side clutch device 1 according to this embodiment applies a torque input to a left and right side via a gear 3 from a speed change portion (not shown) housed in a transmission case 2. A pair of left and right steering side clutch parts 5 provided between the speed change part and the crawler drive shafts 4 and 4 so as to be transmitted to the crawler drive shafts 4 and 4 or not to be transmitted.
(In the illustrated example, only the left side clutch portion is shown) and an operation lever 6 for operating the side clutch portion 5 in a driver's seat (not shown).

The side clutch portion 5 has a sleeve 7 in which a gear portion 7a capable of meshing with the gear 3 is formed at one end and is loosely fitted to a side clutch shaft 8, and the sleeve 7 and the gear shift position corresponding thereto A plurality of friction engagement type brake first discs 29 ... 9 and second discs between the inner periphery of the machine case 2
10 ... 10 is provided. Here, each first disk 9 is spline-fitted to the sleeve 7, and each second disk 10 is spline-fitted to the inner peripheral portion of the transmission case 2.

As a feature of the present invention, in the side clutch device 1, an axial movement operation of the sleeve 7 (clutch engagement / disengagement operation) and an engagement operation of each of the first and second discs 9 and 10 (brake operation). And are configured to be performed via hydraulic pressure.

That is, the first cylinder 16 is connected to a hydraulic passage 14 of which one end communicates with a master cylinder 13 as an oil supply means, and further, a first piston 15 for clutch engagement / disengagement operation is slidably fitted. There is. In that case, the first piston 15
Is linked to the sleeve 7 via a piston rod 15a and a fork (not shown). Further, in the master cylinder 13, a piston (not shown) fitted therein is connected to the arm portion 6a of the operation lever 6 via the rod 17.

A second piston 11 and a second cylinder 12 for pressing the disc are formed on the inner peripheral portion of the transmission case 2. The second cylinder 12 communicates with the first cylinder 16 through the hydraulic passage 14a and the hole 16a on the side surface of the first cylinder 16, and between the first cylinder 16 and the second cylinder 12, A return passage 16b having a check valve is provided. The hole 16a is provided at a position where the first piston 15 is displaced in the clutch disengagement direction and the displacement exceeds a predetermined amount (the amount by which the mesh between the gear 3 and the gear portion 7a is completely released).

The operation is such that, when the operation lever 6 is operated in the clutch disengagement direction, for example, the master cylinder interlocked with the lever 6
The piston in 13 is displaced in a predetermined direction according to the operation amount to generate hydraulic pressure, and the oil is supplied to the first cylinder 16 via the hydraulic passage 14. As a result, the first piston 15 moves, the engagement between the gear 3 and the gear portion 7a is released, and the clutch is disengaged. When the operation lever 6 is further operated in the same direction and the position of the first piston 15 exceeds the hole 16a, oil is supplied from the first cylinder 16 to the second cylinder 12 via the hydraulic passage 14a. As a result, the second piston 11 moves the first disc 9 ...
9 and the second discs 10 ... Moving in the direction of 10 and pressingly engaging the discs 9 and 10, the crawler drive shaft 4 is finally braked.

On the contrary, when the operation lever 6 is returned to the clutch engagement direction, the piston in the master cylinder 13 which is interlocked with the lever 6 is displaced in the direction opposite to the above-mentioned disengagement, so that the cylinder
Oil from 16 returns to the master cylinder 13 via the hydraulic passage 14, the first piston 15 moves to the position before the clutch is disengaged, and the clutch is put in the engaged state. At the same time, oil also returns from the cylinder 12 to the master cylinder 13 through the return passage 16b having a check valve, and the braking is released.

(Effect of the Invention) As described above, according to the side clutch device of the present invention, since the operation is performed via hydraulic pressure, the operation can be stably performed with a small force for a long period of time. Further, since the hole provided on the side surface of the cylinder in the sliding stroke of the piston of the first hydraulic actuator and the cylinder of the second hydraulic actuator are communicated with each other,
Since the second hydraulic actuator does not operate (the braking means brakes the crawler drive shaft) until the first hydraulic actuator operates (the clutch means disconnects the output from the speed change portion), the crawler drive shaft is driven. In this condition, the malfunction of braking the crawler drive shaft does not occur.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a main part showing a combine side clutch device according to the embodiment. 1 ... Side clutch device, 4 ... Crawler drive shaft, 6
...... Operating lever, 7a ...... Clutch means (gear portion of sleeve), 9,10 ...... Brake means (9 ...... first disc, 10 ......
2nd disk), 11, 12 ... 2nd hydraulic actuator (11
...... Second piston, 12 ... Second cylinder), 13,14 ...
... Oil supply means (13 ... master cylinder, 14 ... hydraulic passage), 15, 16 ... first hydraulic actuator (15 ... first piston, 16 ... first cylinder), 16a ... hole.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. Clutch means for turning on and off the output from the speed change portion to the crawler drive shaft, a first hydraulic actuator composed of a piston and a cylinder for operating the clutch means, and oil corresponding to an operation amount of an operating lever. The first hydraulic actuator includes oil supply means for supplying the cylinder of the first hydraulic actuator, braking means for braking the crawler drive shaft, and second hydraulic actuator composed of a piston and a cylinder for operating the braking means. After the piston of the first hydraulic actuator is hydraulically moved, the hole provided on the side surface of the cylinder in the piston's sliding stroke is communicated with the cylinder of the second hydraulic actuator, and then the piston of the second hydraulic actuator moves to the cylinder of the second hydraulic actuator. The combine service is characterized in that Id clutch device.