JPH09112584A - Running part of combine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the slip of the machine body by its bend weight, in a case when a driver leaves from the machine body without stopping the engine while the change lever is left at the neutral position, or the change lever is shifted to the neutral position on the way of running on an uphill road. SOLUTION: While a hydraulic operation type running clutch 10 is provided to the input transmission system to a speed change gear 7 to a crawler running device 1, a parking brake 13 of a negative brake structure is equipped to the output system of the speed change gear 7, and an oil route d a pressure oil is fed in order to input operate a running clutch 10, and an oil route e for operating the parking brake 13 are communicated. While the running clutch 10 is cutting operated following the operation of a change lever 8 to operate the speed change gear 7 to the neutral position N, the parking brake 13 is converted to the braking condition. While the running clutch 10 is input operated following the gear change operation to a position other than the neutral position N, the parking brake 13 is converted to the brake releasing condition.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a traveling portion of a combine.

[0002]

2. Description of the Related Art As a traveling section, a tension clutch type traveling clutch is interposed in a belt transmission system for transmitting power from an engine to a transmission, and braking is released by applying hydraulic pressure to an output system of the transmission. It has been proposed to equip a negative brake type parking brake that is braked by the release of the, where the parking brake is connected to a working hydraulic circuit that receives pressure oil supply from a pump driven by an engine, During operation of the engine, the pump pressure is applied to release the braking state, and when the engine is stopped and the pump pressure is lost, the braking state is applied. Further, the traveling clutch is configured so that it can be operated arbitrarily regardless of the parking brake.

[0003]

According to the above structure, if the traveling clutch is disengaged, the input to the transmission is cut off and the traveling is stopped. It tends to be separated. For this reason, there is a possibility that the aircraft left on the sloping ground with the engine running may move under its own weight. Also, if you forget to return the gear shift lever to neutral and turn off the engine, the parking brake will brake and the aircraft will stop reliably, but the traveling clutch will remain engaged, so the engine will be hydrostatically operated. When the transmission to the continuously variable transmission is performed by belt transmission and the traveling clutch is configured as a tension clutch, if the traveling clutch remains engaged, the belt will be under tension and left for a long time. If so, the belt may have a bending tendency and the durability may be deteriorated.

An object of the present invention is to eliminate such a problem.

[0005]

The invention according to claim 1 is
The traveling clutch is provided in the input transmission system to the transmission for the crawler traveling device, and the parking brake is provided in the output system of the transmission, and the traveling is performed when the transmission lever for operating the transmission is operated to the neutral position. When the clutch is disengaged, the parking brake is switched to the braking release state, and the traveling clutch is operated in conjunction with the shift operation to a position other than the neutral position of the shift lever, and the parking brake is switched to the braking operation state. The operating system of the traveling clutch and the operating system of the parking brake are linked together.

[Operation] According to the structure of claim 1, in the normal traveling state, the parking brake is held in the released state and the traveling clutch is in the "engaged" state. If you operate the shift lever to the neutral position while the engine is running, the parking brake will be in the braking state and
The traveling clutch is in the "disengaged" state.

[Effect] Therefore, according to the invention of claim 1, when it is desired to temporarily stop during the work, the parking brake is applied only by operating the gear shift lever to the neutral position, so that the engine is not stopped. It was possible to park the car, eliminating the need to stop the engine each time it was stopped for a short time, thus improving the handleability. Further, even when the gear shift lever is in the neutral position during traveling on an uphill slope, the parking brake is effective, and the vehicle can be stopped without slipping and the operability can be improved.

According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the traveling clutch is hydraulically operated, and the parking brake is released by applying hydraulic pressure and released by releasing hydraulic pressure. A negative brake structure that operates is provided, and an oil passage to which pressure oil is supplied to engage and operate the traveling clutch and an oil passage for operating the parking brake are connected.

[Operation] According to the second aspect of the present invention, in a normal traveling state, the hydraulic pressure is applied to the parking brake to maintain the braking release state, and the traveling clutch is in the "engaged" state. Here, if the gear shift lever is operated to the neutral position while the engine is running, the hydraulic pressure applied to the parking brake is released to bring it into a braking state and the traveling clutch into a "disengaged" state. Also, even if you forget to return the gear shift lever to neutral and stop the engine, the parking brake will be in a braking state due to the disappearance of the pump pressure,
The running clutch is also in the "disengaged" state.

[Effects] Therefore, according to the invention of claim 2, the effect of the invention of claim 1 is brought about, and the link between the traveling clutch operation system and the parking brake operation system can be easily realized as a hydraulic circuit. .

The invention according to claim 3 is the invention according to claim 1 or 2
In the invention according to claim 1, the disengagement operation of the clutch and the braking operation of the parking brake are executed based on the detection that the shift lever is held at the neutral position for a set time or more. It is characterized by

[Operation / Effect] According to the configuration of claim 3,
In addition to the above-described actions and effects of the invention according to claim 1 or 2, when the gear shift lever is operated to switch between forward and backward movement, the parking brake is not applied to the extent that the neutral position is passed for a moment, and the aircraft is stopped. The parking brake is braked only when the conscious neutral return operation is performed, and normal gear shifting can be smoothly performed.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the left and right crawler traveling devices are independently driven by the transmissions, and the transmissions are not hydrostatic. It is characterized in that it is constituted by a stepped speed change device, and both speed change devices can be operated by a single speed change lever.

[Operation / Effect] According to the configuration of claim 4,
The left and right crawler traveling devices can be moved straight forward and backward at any speed by operating the speed change levers, and the left and right crawler traveling devices can be steered to give a speed difference to operate the aircraft with arbitrary characteristics. The vehicle can be driven and steered with excellent operability, and the left and right crawler traveling devices can be braked by the parking brakes respectively, so that the aircraft can be reliably stopped. The effect of the invention according to item 3 can be more effectively exhibited.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows, as an example of a combine to which the present invention is applied, an all culm throwing type axial flow combine. In this combine, a cutting pretreatment unit 3 is connected to a front portion of a vehicle body 2 having a pair of left and right crawler traveling devices 1 so as to be capable of being driven up and down, and an axial flow provided with a spiral handling cylinder 4a on the vehicle body 2. A threshing device 4, a control unit 5, and a grain tank 6 are mounted.

The left and right crawler traveling devices 1 are each a pump-motor separated type hydrostatic stepless transmission (HS).
T) is independently driven by the transmission 7. Each transmission 7 can continuously adjust the pressure oil discharge amount and can reverse the discharge direction as shown in FIG. It consists of an axial plunger type pump 7P that can be operated, and an axial plunger type motor 7M whose capacity can be switched between two stages by switching the angle of the swash plate. The pump 7P is driven by the mounted engine E and the motor 7M is a crawler. The wheel motor is directly attached to the traveling device 1, and the pump 7P and the motor 7M are connected by hydraulic piping.

The swash plate angle adjusting trunnion shaft, which is a gear shift operation portion of each pump P, is mechanically linked to a single gear shift lever 8. When the gear shift lever 8 is operated to the neutral position N, the pump 7P is operated. When the pressure oil discharge becomes zero and the traveling stop state is brought about, and when the speed change lever 8 is operated in the forward movement range F, the amount of pressure oil corresponding to the operation position is discharged, and the forward speed change can be continuously performed. On the contrary, when the shift lever 8 is operated beyond the neutral position N to the reverse travel region R, the amount of pressure oil corresponding to the operated position is discharged in the reverse direction, and the reverse shift can be continuously performed.

Although not shown, both pumps 7P are mechanically linked to a single steering lever, and the pumps 7P are swung in accordance with the swinging amount of the steering lever to the left or right. The pump P on the moved side is modified to reduce the discharge amount, and a speed difference is given to the left and right crawler traveling devices 1 to steer the machine body in the direction in which the steering lever is rocked. There is.

As shown in FIGS. 2 and 3, each transmission 7
The pump 7P is linked to the engine E through the belt transmission mechanism 9, and the traveling clutch 10 composed of a tension clutch can interrupt the transmission of power to the pump drive system.
Is the clutch "engaged" when the hydraulic cylinder 11 is shortened, and the clutch "disengaged" when the hydraulic cylinder 11 is extended.
It is configured so that The tension arm 10a forming the traveling clutch 10 is spring-biased toward the clutch "disengaged" side.

FIG. 4 shows the transmission 7 and the hydraulic circuit for working. In the figure, 12 is each motor 7
It is a sub-transmission cylinder for switching the swash plate angle provided in M, and when the pressure oil is supplied to the port a, the low speed is brought, and when the pressure oil is supplied to the port b, the high speed is brought. . Reference numeral 13 is a parking brake having a negative brake structure provided in each motor 7M, and the port c
The braking is released by the application of the hydraulic pressure to the motor, and the internal braking is applied to the motor 7M to mechanically brake the application of the hydraulic pressure. Further, 14 is an electromagnetic switching valve that controls the supply of pressure oil to the sub-transmission cylinder 12, and 15 is the pressure oil supply to a hydraulic cylinder 17 that turns on and off a transmission clutch (cutting clutch) 16 to the pre-cutting processing section 3. The electromagnetic switching valve 18 controls the electromagnetic clutch, which controls the supply of pressure oil to the hydraulic cylinder 20 that operates the transmission clutch (through clutch) 19 to the threshing device 4. The electromagnetic switching valves 14, 15 and 18 are operated. It is switched by a switch operation in the section 5. Reference numeral 21 denotes an electromagnetic switching valve that controls the supply of pressure oil to the hydraulic cylinder 11 for operating the traveling clutch, which is detected by the control device 24 based on the detection of the depression operation of the traveling clutch pedal 23 provided in the control section 5. The clutch is operated to the clutch disengaged position, and switching control is performed based on the operation of the shift lever 8 as described below.

The operating position of the shift lever 8 is detected by a sensor 22 such as a potentiometer, and when the sensor 22 detects that the shift lever 8 is in the forward travel region F or the reverse travel region R, the hydraulic cylinder 11 contracts. It is driven and the traveling clutch 10 is maintained in the “engaged” state. Here, both parking brakes 1 are connected to the oil passage d through which the hydraulic oil is supplied to the hydraulic cylinder 11 for the operation of engaging the traveling clutch.
The operation oil passages 3 of 3 are connected in communication with each other. Therefore, when the traveling clutch 10 is in the “engaged” state, the hydraulic pressure is applied to both parking brakes 13 and the braking state is released.

When the sensor 22 detects that the shift lever 8 has been operated to the neutral position N, the hydraulic cylinder 11 is extended and driven, the traveling clutch 10 is operated to the "disengaged" state, and the oil passage When d becomes the oil discharge passage, the application of the hydraulic pressure to the operation oil passage e of both parking brakes 13 is released, whereby both parking brakes 13 are brought into the braking state. However, the above control is performed in the neutral position N of the speed change lever 8.
Delay control element is incorporated so that it is executed only when is continuously detected for a set time or longer, and the shift lever 8 shifts the neutral position N to the forward / reverse direction for a very short time within the set time. When passing, the traveling clutch 10
And the braking control of the parking brake 13 are not performed.

Further, when the engine E is stopped by operating the key switch when the transmission lever 8 is forgotten to be returned to the neutral position N, the pressure oil supply from the work pump P is stopped and the power supply circuit is turned off. The electromagnetic switching valve 21 that has been deenergized by returning to the clutch disengaged position communicates with the oil passage d to the tank, and the pressure in the operation oil passage e also decreases, so that both parking brakes 13
Becomes braking. In this case, the electromagnetic switching valve 21
Is not returned to the clutch disengagement position, the hydraulic oil drive for extending the hydraulic cylinder 11 to the clutch "disengagement" side is not performed, but the hydraulic cylinder 11 is automatically extended by the urging action of the tension arm 10a. Become.

[Other Embodiments] The present invention can also be implemented in the following modes. The output from a single transmission 7 is branched and transmitted to the left and right crawler traveling devices 1. As the transmission 7, a gear transmission or a belt type continuously variable transmission is used. A hydraulic multi-disc friction clutch is used as the traveling clutch 10.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

1] Overall side view of combine

FIG. 2 is a plan view of a transmission drive unit.

FIG. 3 is a front view of a transmission drive unit.

FIG. 4 is a hydraulic circuit diagram for shifting and working.

[Explanation of symbols]

 1 Crawler traveling device 7 Transmission device 8 Shift lever 10 Traveling clutch 13 Parking brake N Neutral position d, e Oil passage

Claims (4)

[Claims] 1. A traveling clutch (10) is interposed in an input transmission system to a transmission (7) for the crawler traveling device (1), and a parking brake (13) is provided in an output system of the transmission (7). Then, the traveling clutch (10) is disengaged and the parking brake (13) is switched to the braking state in accordance with the operation of the transmission lever (8) to operate the transmission (7) to the neutral position (N). In addition, the traveling clutch (10) is turned on and off in response to a shift operation to a position other than the neutral position (N) of the speed change lever (8), and the traveling clutch is switched to the brake release state. A traveling unit of a combine characterized in that an operation system of (10) and an operation system of a parking brake (13) are linked. 2. The traveling clutch (10) is configured to be hydraulically operated, and the parking brake (13) is configured to have a negative brake structure in which braking is released by applying hydraulic pressure and braking is performed by releasing hydraulic pressure. An oil passage (d) to which pressure oil is supplied to enter and operate the traveling clutch (10) and an operation oil passage (e) of the parking brake (13) are communicated with each other. The traveling part of the combine according to claim 1. 3. The disengagement operation of the traveling clutch (10) and the parking brake (13) based on the detection that the speed change lever (8) is held at the neutral position (N) for a set time or more. The traveling part of the combine according to claim 1 or 2, wherein the braking operation is performed. 4. The left and right crawler traveling devices (1) are independently driven by respective transmissions (7), and each transmission (7) is constituted by a hydrostatic continuously variable transmission, and both transmissions ( The traveling part of the combine according to any one of claims 1 to 3, wherein (7) is configured to be able to perform a gear shift operation with a single gear shift lever (8).