JPH05312223A - Hydraulic main clutch device - Google Patents

Abstract

PURPOSE:To attempt cost down owing to decrease in the number of parts and also to freely set the mounting position of a valve. CONSTITUTION:A hydraulic main clutch 3 is controlled to be set ON-OFF by an electromagnetic proportional valve 6. A step-in position detection sensor 12 which detects the step-in position of a clutch pedal is provided, and a controller 13 which receives a detection signal of the step-in position detection sensor 12 and controls the electromagnetic proportional valve 6 is provided so that it may match the step-in position of the clutch pedal 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic main clutch device used in a traveling power transmission system.

[0002]

2. Description of the Related Art Conventionally, in a traveling vehicle such as a tractor, a mechanical wet multi-plate main clutch has been used as a main clutch of a traveling power transmission system, and a link is used to link a clutch pedal and a valve. Due to
The pressure inside the clutch pack was controlled.

[0003]

Therefore, in the conventional mechanical system, there are problems that the mounting positions of links, valves, etc. are limited and the number of parts is increased. In view of the above problems, the present invention is intended to reduce the cost due to the phenomenon of the number of parts and to allow the valve mounting position to be set relatively freely.

[0004]

[Means for Solving the Problems] The technical means of the present invention for solving this technical problem is provided with a hydraulic main clutch 3 controlled to be turned on and off by a solenoid proportional valve 6, and to change a depression position of a clutch pedal 5. A stepping position detection sensor 12 for detecting is provided, and a controller 13 for inputting a detection signal of the stepping position detection sensor 12 and controlling the solenoid proportional valve 6 so as to correspond to the stepping position of the clutch pedal 5 is provided. is there.

[0005]

[Function] The stepping position detection sensor 12 detects the stepped position of the clutch pedal 5, and the controller 13 which inputs the detected signal controls the solenoid proportional valve 6, and the clutch pedal 5
Turn on / off the hydraulic main clutch 3 according to the stepped position of.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 is a traveling power transmission system of a tractor. 2 is the engine, 3 is the hydraulic main clutch, and 4 is the transmission of the tractor mission. 5 is a clutch pedal and 6 is a solenoid proportional valve. The hydraulic main clutch 3
Is a hydraulic clutch for switching such as a high / low transmission and a forward / reverse switching device of the traveling power transmission system 1.
The pressure oil can be supplied from.

The clutch pedal 5 is pivotally supported via a support shaft 11 on a support base of the tractor control section. The depression amount of the clutch pedal 5 is detected by the depression position detection sensor 12, and the detection signal is sent to the controller 13.
The controller 13 is connected to the solenoid proportional valve 6, changes the output voltage according to the detection signal obtained from the depression position detection sensor 12, and changes the solenoid proportional valve 6 from the open state to the closed state according to the depression of the clutch pedal 5. It is supposed to change. The solenoid proportional valve 6 opens when not energized, supplies pressure oil to the hydraulic main clutch 3, and when energized changes the pressure oil throttle amount and finally closes the hydraulic main clutch 3. Allows drainage of pressure oil from.

The controller 13 includes a microprocessor and the like, which outputs a one-shot high voltage in the vicinity of the maximum depression position of the clutch pedal 5, and then releases a control signal which gradually increases as the clutch pedal 5 is released. , So that the controller 13 can temporarily increase the internal pressure of the hydraulic main clutch 3 when the clutch pedal 5 is released, as shown in FIG. After that, the solenoid proportional valve 6 is controlled so as to release the depression and gradually increase the internal pressure of the hydraulic main clutch 3. Therefore, in this case, when the clutch pedal 5 is suddenly operated, the rise of the pressure in the clutch pack is not delayed, so that the clutch delay at the time of sudden start is eliminated and the shock at the time of start is not caused. Is improved. Also, after temporarily increasing the internal pressure of the hydraulic main clutch 3 to release the pedal,
Since the internal pressure of can be gradually increased with a smooth curve, the movement allowance of the clutch pedal 5 in the half-clutch state of the hydraulic main clutch 3 can be lengthened, and from this point also the clutch operability is improved.

FIG. 3 shows another embodiment in which the control of the solenoid proportional valve 6 by the controller 13 is changed. As shown in FIG. 3, the internal pressure of the hydraulic main clutch 3 is released when the clutch pedal 5 is released. Is rapidly raised and then is raised in a smooth curve as a quadratic curve. In this case, the movement allowance of the clutch pedal 5 in the half-clutch position increases, the shock at the time of starting is small, and the clutch operability is improved.

FIG. 4 shows another embodiment, in which the hydraulic main clutch 3 is constituted by a wet multi-plate hydraulic clutch having a forward hydraulic clutch 3a and a reverse hydraulic clutch 3b, and the hydraulic main clutch 3 is moved forward and backward. It is designed so that it can be used as both a switchable shuttle clutch and a main clutch.
A pair of proportional solenoid valves 6a, 6b are provided corresponding to the forward clutch 3a and the reverse hydraulic clutch 3b, and the hydraulic pumps 7a, 7b
Can supply pressure oil to the clutches 3a, 3b via the proportional solenoid valves 6a, 6b. In addition, a forward / reverse switching lever 17 is provided, and the switching signal of the forward / reverse switching lever 17 is controlled by the controller.
I am trying to type in 13. The controller 13 inputs the switching signal of the forward / reverse switching lever 17 and the detection signal of the stepping position detection sensor 12, supplies pressure oil to the clutches 3a, 3b on the side where the forward / reverse switching lever 17 is set, and The pressure oil is variably controlled according to the depression of the clutch pedal 5. That is, when the forward / reverse switching lever 17 is tilted to the forward side, the forward proportional solenoid proportional valve 3a changes from the closed state to the open state, and pressure oil is applied to the forward clutch 3a from the pump 7a according to the depression of the clutch pedal 5. Is supplied with the forward clutch
3a becomes connectable, the reverse solenoid valve 6b is closed, and the pressure oil from the reverse clutch 3b is drained. If the forward / reverse switching lever 17 is tilted to the reverse side, the reverse proportional solenoid proportional valve 6b changes from the closed state to the open state, and the reverse clutch 3b is pressed according to the depression of the clutch pedal 5 from the hydraulic pump 7b. The oil is supplied, the reverse clutch 3b becomes connectable, the forward proportional solenoid proportional valve 6a is closed, and the pressure oil from the forward clutch 3a is drained. Therefore, in the case of this embodiment, since the shuttle clutch and the main clutch can be used in common, the number of clutches is reduced,
The manufacturing cost is reduced accordingly.

[0011]

According to the present invention, the depression position detection sensor 12 for detecting the depression position of the clutch pedal 5 is provided, and the detection signal of the depression position detection sensor 12 is inputted to correspond to the depression position of the clutch pedal 5. As solenoid proportional valve
Since the controller 13 that controls 6 is provided, the link etc. is not required, the number of parts is reduced, the manufacturing cost is cheaper, and the valve position etc. are more freely mounted than the mechanical type. It will be possible to set it in position. Further, the pressure increase pattern of the internal pressure of the hydraulic main clutch 3 can be freely set by the control of the controller 13, and the operability of the clutch can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between pedal position and clutch pack internal pressure.

FIG. 3 is a graph showing the relationship between pedal position and clutch pack internal pressure in another embodiment.

FIG. 4 is a configuration diagram showing another embodiment.

[Explanation of symbols]

 3 Hydraulic main clutch 5 Clutch pedal 6 Electromagnetic proportional valve 12 Stepping position detection sensor 13 Controller

Claims (3)

[Claims] 1. A clutch pedal provided with a hydraulic main clutch (3) controlled to be turned on and off by an electromagnetic proportional valve (6).
Depression position detection sensor (12) that detects the depression position of (5)
And a controller (13) for controlling the solenoid proportional valve (6) so that the detection signal from the depression position detection sensor (12) is input to correspond to the depression position of the clutch pedal (5). The main hydraulic clutch device. 2. The controller (13) includes a hydraulic main clutch (3) for releasing the depression of the clutch pedal (5).
The hydraulic proportional valve (6) according to claim 1, wherein the solenoid proportional valve (6) is controlled so as to gradually increase the internal pressure of the hydraulic main clutch (3) when the internal pressure of the hydraulic pressure is temporarily increased. Main clutch device. 3. The hydraulic main clutch (3) when the controller (13) releases the clutch pedal (5).
2. The hydraulic main clutch device according to claim 1, wherein the solenoid proportional valve (6) is controlled such that the internal pressure of the valve is rapidly increased and then increased in a smooth curve.