JPH078657B2 - Side clutch device for traveling work vehicle - Google Patents

Description

The present invention relates to a hydraulic side clutch device used in a working vehicle such as a combine, and more specifically, to a hydraulic actuator for braking or a mechanical operating means by human power. The present invention relates to a side clutch device having an operable brake.

(B) Conventional Technology Conventionally, a hydraulic side clutch device in a traveling work vehicle is configured such that a clutch and a brake are operated by the same hydraulic actuator installed inside a transmission case. Is a left and right side clutch device 2 as shown in FIG.
1 and 2r, and these devices 2l and 2r are mounted in the mission case 3. A steering shaft 5 is rotatably supported on the case 3, and a center gear 6 is rotatably supported on the central portion of the steering shaft 5 while being prevented from lateral movement. Further, dog gears 7l and 7r are supported on the left and right portions of the steering shaft 5 so as to be movable left and right and rotatable, and dog claws 6a and 6b are formed on the left and right surfaces of the center gear 6, respectively. The dog claws 6a, 6b can engage with the left and right dog gears 7l, 7r. Further, left and right hydraulic pistons 10l, 10r are joined and arranged to the left and right dog gears 7l, 7r via thrust bearings 9 inside the center gear 6, respectively. The piston, the center gear 6 and the steering shaft 5 constitute the piston. Left and right hydraulic actuator 11
Each of l and 11r communicates with the switching valve via an oil passage 12a formed in the case 3 and an oil passage 12b formed in the steering shaft 5. Further, wet multi-plate brakes 15l and 15r are arranged on the left and right sides of the left and right dog gears 7l and 7r, respectively, and return springs 16 and 16 are compressed. And
Rotation is transmitted from the engine to the center gear 6 via a gear 17, and the left and right dog gears 7l, 7r are formed by meshing axle gears 20l, 20r fixed to the left and right axles 19l, 19r, respectively. There is.

Therefore, when the traveling work vehicle travels straight, the rotation from the engine is transmitted to the center gear 6 through the gear 17, and further transmitted to the left and right dog gears 7l and 7r through the left and right dog claws 6a and 6b, and the axle gears. Left and right axles 19 via 20l, 20r
The same speed rotation is transmitted to l and 19r. In this state, for example, if the left side clutch operating lever is pulled lightly, the pressure oil of the pump will change to the hydraulic actuator 1l of the left side clutch device 21l.
It is supplied to 1l and further moves the left dog gear 7l through the hydraulic piston 10l against the return spring 16 and the dog claw.
6a is disengaged and the clutch becomes disengaged,
The brake 15l is not contacted, or even if it is contacted, the brake 15l is contacted with a weak pressure contact force, and the braking force hardly acts. Therefore, the left side clutch 12l is simply in the free state with the transmission discontinued.
Further, for example, when the left side clutch operation lever is strongly pulled, relatively high pump pressure oil is supplied to the left hydraulic actuator 11l based on the large movement amount of the spool, and the left dog gear 7l moves largely against the return spring 16. The dog claw 6a is disengaged and the clutch is disengaged, and the left dog gear 7l is pressed against the left wet multi-plate brake 15l to be braked.

(C) Problems to be Solved by the Invention By the way, in the hydraulic side clutch device described above, the brakes and the clutches provided inside the same mission case 3 are configured to be operated by the common hydraulic actuators 11l and 11r. However, these hydraulic actuators 11
Because of their structure, l and 11r are formed as large-diameter hydraulic actuators, and therefore have a small stroke, making it difficult to perform delicate braking operations on the clutch and brake. Also, when the hydraulic pump is not operating, such as when the engine is stopped, hydraulic pressure cannot be introduced to the hydraulic actuators 11l and 11r.Therefore, install a parking brake for parking other than the brakes 15l and 15r. It causes the inconvenience of having to.

(D) Means for Solving Problems The present invention is intended to solve the above-mentioned problems, and for example, as shown in FIGS. 1 and 2, friction brakes 36L and 36R are The clutch hydraulic actuators 40L and 40R are connected to different hydraulic actuators 35L and 35R and are installed on the transmission wake side of the friction clutches 33L and 33R, and the brake hydraulic actuators 35L and 35R are provided outside the transmission case. Installed and also said friction brake
Mechanically connecting the operation means B by human power to 36L and 36R,
The friction brake is connected to the brake hydraulic actuator 35.
L, 35R or manually operated operation means B, and the hydraulic pressure switching valves 39L, 39R release the hydraulic pressure of the brake hydraulic actuators 35L, 35R and the clutch hydraulic actuators 40L, 40R. And a first position for supplying hydraulic pressure to the clutch hydraulic actuator 40.
A second position for releasing the hydraulic pressure of the L, 40R and the brake hydraulic actuators 35L, 35R, and a third position for supplying hydraulic pressure to the brake hydraulic actuators 35L, 35R and releasing the hydraulic pressure of the clutch hydraulic actuators 40L, 40R Is a three-position switching valve that selectively takes the position of the friction clutch 3 and the hydraulic switching valves 39L and 39R to the first position.
3L and 33R are connected, brakes 36L and 36R are released, and the hydraulic switching valves 39L and 39R are set to the second position to disengage the friction clutches 33L and 33R and brakes 36L and 36R.
Then, the hydraulic pressure switching valves 39L, 39R are set to the third position to operate the brakes 36L, 36R with the friction clutches 33L, 33R kept disengaged.

(E) Action Based on the above configuration, the brakes 36L and 36R are connected to the clutches 33L and 3R.
It is operated by hydraulic actuators 35L, 35R installed outside the mission case 3 separately from the 3R hydraulic actuator, and is also operated by a mechanically-operated human-operated means B such as a parking brake. Here, for example, when the hydraulic pressure switching valves 39L, 39R are switched from the first position to the third position, the friction clutches 33L, 33R are disengaged and the brakes 36L, 36R are actuated. , 39R goes through the second position, so brakes 36L, 3
The operation of 6R is always performed after the friction clutches 33L and 33R are disengaged.

(F) Example Hereinafter, an example according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, in the traveling work vehicle, the rotation of the engine E is transmitted to the automatic threshing machine PTO22 via the gear device 21, and the drive side split pulley 23, the driven side split pulley 25 and the belt 26 are provided.
Is transmitted to the continuously variable transmission 27. Further, the rotation of the continuously variable transmission 27 is transmitted to the preprocessing unit PTO 29, and the second speed clutch 30, the first speed clutch 31, and the reverse clutch are also transmitted.
32, sprocket 3 that drives the left and right crawlers via the left friction side clutch 33L and the right friction side clutch 33R
Has been transmitted to 7. Further, the left and right wet friction disc brakes 36L, 36R are provided respectively on the downstream side of the transmission of the left and right side clutches 33L, 33R, and the hydraulic actuators 35L, 35L, 36R for operating the left and right wet disc brakes 36L, 36R, respectively. 35R is configured separately from the hydraulic actuators that actuate the left and right side clutches 33L and 33R, and is installed outside the mission case. A brake pedal B (or a parking brake lever) installed in the driver's seat of the traveling work vehicle is mechanically connected to the left wet disc brake 36L and the right wet disc brake 36R, and the brake pedal B is connected to the brake pedal B. It is configured to be operated and operated manually.

Further, as shown in FIG. 2, the left side clutch / brake operating valve 39L consisting of a three-position switching valve is a hydraulic actuator 40L for operating the left side clutch 33L and a hydraulic actuator 3 for operating the left wet disc brake 36L.
The right side clutch operating valve 39R, which is connected to the 5L, and which is a 3-position switching valve, is connected to the hydraulic actuator 40R that operates the right side clutch 33R and the hydraulic actuator 35R that operates the right wet disc brake 36R. A steering clutch / brake circuit 41 is constituted by these actuators and valves. The side clutch / brake operation valves 39L, 39R described above
As is apparent from FIG. 2, the first position for releasing the hydraulic pressure of the brake hydraulic actuators 35L, 35R and supplying the hydraulic pressure to the clutch hydraulic actuators 40L, 40R, and the clutch hydraulic actuators 40L, 40R and the brake hydraulic actuators The second position to release the hydraulic pressure of the hydraulic actuator 35L, 35R,
It is configured to selectively take a third position for supplying hydraulic pressure to the brake hydraulic actuators 35L, 35R and releasing the hydraulic pressure for the clutch hydraulic actuators 40L, 40R. Further, the travel clutch operating valve 42 is connected to a hydraulic actuator 43 that operates the first speed clutch 31 and a hydraulic actuator 45 that operates the second speed clutch 30, and the reverse clutch operation valve 46 is a reverse clutch. It is communicated with a hydraulic actuator 47 for operating 32, and these actuators and valves constitute a main shift clutch circuit 49. A relatively high pressure hydraulic pump 50 is used, and an electromagnetic proportional control valve 51 is interposed in a relief circuit communicating with the discharge side of the pump 50. As shown in the figure, the solenoid is based on the operating angle of the side clutch operating lever.
The drain flow rate is adjusted according to the change in the current acting on 51a, and the pressure acting on the left and right brake hydraulic actuators 35L, 35R is adjusted. In the figure, reference numeral 52 is an accumulator.

Then, as shown in FIG. 4, left switch _{S L,} right switch _{S R,} the main switch _{S W} is connected. That is, the left switch S _L disposed on the left side clutch lever over 53L of the operating lever 53 is connected to the relay R1.
The normally open contact R1a is turned on by energizing the relay R1 by operating the left side clutch lever 53L at a small angle, the solenoid 39La of the left side clutch / brake operating valve 39L is energized, and the left side clutch 33L is disconnected. It Furthermore, the right side clutch lever 53R of the operation lever 53
Disposed a right switch S _R is connected to the relay R2. Then, the relay R2 is energized by operating the left side clutch lever 53R at a small angle, the normally open contact R2a is turned on, the solenoid 39Ra of the right side clutch / brake operating valve 39R is energized, and the right side clutch 33R is Be disconnected. Also, the normally open contact R3a is turned on by energizing the relay R3 that is turned on by operating the left side clutch lever 53L at a large angle, and the solenoid 39Lb of the left side clutch / brake operating valve 39L is energized to turn on the left wet disk. The brake 36L is activated. In addition, the relay R4 is turned on by operating the right side clutch lever at a large angle.
The normally open contact R4a is turned on when the power is supplied to the solenoid 3 of the right side clutch / brake operating valve 39R.
9Rb is energized and the right wet disc brake 36R is activated. Further, the voltage values of the left and right potentiometers P _L and P _R that detect the operating angles of the left and right side clutch levers 53L and 53R are output to the control unit 55, and the control unit 55 turns on and off the relays R3 and R4. At the same time, the solenoid 51a of the electromagnetic proportional control valve 51 is controlled.

Since this embodiment has the above-mentioned configuration, the operation lever
When 53 is in the neutral position, the switches S _L and S _R are off, the left and right side clutches 33L and 33R are held in the connected state, and the left and right brakes 36L and 36R do not operate and the traveling work vehicle goes straight. Is in a state.

Then, when the rotational operation of the left operating lever 53L to the left side clutch switching position, the switch S _L is turned on, the relay
R1 is energized. When the relay R1 is energized, the normally open contact R1a is turned on, the solenoid 39La of the left side clutch / brake operating valve 39L is excited, the hydraulic actuator 40L for the left side clutch is drained, and the left side clutch 33L is disengaged. Then, the traveling work vehicle is corrected to the left. Further, when the left operation lever 53L is largely rotated to the left brake operating position, the left potentiometer P
_The normally open contact R3a is turned on by energizing the relay R3 based on _L , the solenoid 39Lb of the left side clutch / brake operation valve 39L is excited, and the left side is installed outside the mission case separately from the hydraulic actuator of the side clutch. The left wet type disc brake 36L is operated by the hydraulic actuator 35L for brake operation. At this time, the voltage acting on the solenoid 51a of the electromagnetic proportional control valve 51 is changed in accordance with the operation angle of the operation lever 53L, and the flow rate for draining the relief circuit communicating with the discharge side of the hydraulic pump 50 is adjusted to the left. Hydraulic actuator 3 that activates the brake 36L
The pressure acting on 5L is adjusted. As a result, as shown in FIG. 3, the pressure oil is sent to the hydraulic actuator 35L for operating the left brake in accordance with the operation amount of operating the operation lever 53L to the left, and the left wet type disc brake 36L moves to the operation lever 53L. The braking force is activated according to the operation amount. Further, when the rotational operation of the right operating lever 53R to the right side clutch switching position, the switch S _R is turned on, the relay R2 is energized. The normally open contact 2a is turned on by energizing the relay R2, and the right side clutch / brake operating valve 39
The R solenoid 39Ra is excited, and the right side clutch 33R
Is turned off, and the traveling work vehicle is turned to the right. Moreover, increasing the rotational operation of the operating lever 53L to the right brake applied position, the relay based on the right potentiometer P _R
R4 is energized, and the relay R4 is energized to turn on the normally open contact R4a. Then, the solenoid 39Rb of the right side clutch / brake operation valve 39R is excited, and the right wet disk brake 36R is activated. At this time, the operating lever 53R
In addition to the clutch hydraulic actuator, pressure oil is sent to the right brake actuating hydraulic actuator 35R installed outside the transmission case according to the amount of operation to operate the right wet disc brake 36R to operate the operating lever 53R. It is operated with the braking force according to the amount.

By the way, since the left and right side clutch / brake operation valves 39L, 39R each comprise a three-position switching valve having a neutral zone in the middle, when operating the side clutch device, for example, the left side clutch / brake operation valve 39L is operated. When switching from the hydraulic actuator side of the left side clutch 33L to the hydraulic actuator 35L side of the left wet disc brake 36L, the valve 39L always switches after passing through the neutral zone, so the hydraulic actuator of the left side clutch 33L drains. After that, the clutch is disengaged, pressure oil is sent to the hydraulic actuator 35L, and the left wet type disc brake 36L is activated.

The above-described operation is the same for the right side clutch / brake operation valve 39R, and the above-mentioned valve switching is performed from the side clutch side to the brake side. Even when the valve is switched to the clutch side, the same action causes the left side clutch 33 to be connected after the left wet type disc brake 36L is released.

The left wet disc brake 36L and the right wet disc brake 36R are also operated by depressing the brake pedal B of the driver's seat mechanically connected to the brakes 36L and 36R such as Bowden wire or a link mechanism. The braking force acts with a strength corresponding to the driver's operation force. Therefore, the left wet type disc brake
36L and right wet disc brake 36R are hydraulic actuators 35L, 35L on the left and right provided outside the mission case.
It can be operated either by R or by a mechanically connected brake pedal B.

(G) Effect of the Invention As described above, according to the present invention, the brakes 36L, 36
R is connected to hydraulic actuators 35L and 35R installed outside the transmission case separately from the clutch hydraulic actuator, and is installed on the downstream side of the transmission of the clutches 33L and 33R, and the brakes 36L and 36R are operated manually. B is mechanically connected so that the brakes 36L, 36R can be operated by the hydraulic actuators for brakes 35L, 35R or the mechanical operation means B by human power. In comparison with a hydraulic actuator composed of a gear and a clutch shaft, its diameter and stroke can be arbitrarily set, so that the braking force of the brake can be delicately controlled. Furthermore, since the brake hydraulic actuators 35L and 35R are configured separately from the mission case, the hydraulic actuator can be provided at any position. Further, since the turning brakes 36L and 36R can be used simultaneously as a parking brake or an emergency brake, it is not necessary to separately install a parking brake in addition to the turning brake, thus saving a wasteful space. , The body can be compactly integrated.

Further, since the hydraulic pressure switching valves 39L and 39R are constituted by a three-position switching valve having a neutral zone in the middle, the hydraulic pressure switching valve 39L (or 39R) is connected to the brake hydraulic actuator 35L (or 35R) by the clutch. When switching to the hydraulic actuator for use, or vice versa, the hydraulic switching valve 39L (or 39R) always passes through the neutral zone for switching, so that the clutches 33L, 33R and the brakes 36L, 36R act simultaneously. There is no. Therefore, the clutch 33
The L, 33R and the brakes 36L, 36R do not act at the same time to exert an unreasonable force on various devices, and the traveling work vehicle can perform stable work (travel) without power loss.

Further, since the clutches 33L, 33R are of the type that is connected by supplying hydraulic pressure (hydraulic load type), sufficient connection is secured by the hydraulic pressure. Generally, in the type that connects the clutch with the pressing force of the spring, the spring may be made large to secure sufficient connection,
It is necessary to increase the number of friction plates, but in the case of the hydraulic load type, there is no such need, and therefore the size can be reduced. Further, in the present invention, since the clutches 33L and 33R are friction clutches, smooth connection is possible.

[Brief description of drawings]

FIG. 1 is a transmission system diagram of the present invention, FIG. 2 is a hydraulic circuit diagram of different parts, FIG. 3 is a diagram showing a relationship between an operating angle of an operating lever and a hydraulic pressure of a hydraulic actuator, and FIG. FIG. 5 is an electric circuit diagram, and FIG. 5 is a sectional view showing a conventional hydraulic side clutch device. 3 ... mission case, 33L, 33R ... clutch, 35L, 3
5R …… Brake hydraulic actuator, 36L, 36R …… Brake, 39L, 39R …… Hydraulic switching valve, 40L, 40R …… Hydraulic actuator (for clutch), 50 …… Hydraulic pump, B ……
Manual operation means

Claims (1)

[Claims] 1. A side clutch device in a traveling work vehicle having pressure friction from a hydraulic pump introduced into a hydraulic actuator via a hydraulic switching valve and having a friction clutch and a friction brake operated by the hydraulic actuator. The brake is connected to a hydraulic actuator other than the clutch hydraulic actuator and is installed on the downstream side of the transmission of the friction clutch, and the brake hydraulic actuator is installed outside the transmission case and input to the friction brake. Is configured so that the friction brake can be actuated by the brake hydraulic actuator or manual operating means, and the hydraulic switching valve controls the hydraulic pressure of the brake hydraulic actuator. When the hydraulic actuator for the clutch is pulled out, A first position for supplying, a second position for releasing the hydraulic pressure of the clutch hydraulic actuator and the brake hydraulic actuator, and a second position for supplying hydraulic pressure to the brake hydraulic actuator and releasing the hydraulic pressure of the clutch hydraulic actuator. 3 position selector valve for selectively taking the 3 position and the hydraulic switch valve to the 1st position so that the friction clutch is connected and the brake is released. By disengaging the friction clutch, the brake is released, and by setting the hydraulic pressure switching valve to the third position, the brake is operated with the friction clutch disengaged. apparatus.