JPH02253012A - Control device for hydraulic clutch - Google Patents

Abstract

PURPOSE:To install a hydraulic clutch on a vehicle incorporating a clutch pedal by providing a controller adapted to receive a signal from a stroke sensor for the clutch pedal, for applying a current to first and second pressure control solenoid valves so as to control a hydraulic control circuit in association with a manipulation of the clutch pedal. CONSTITUTION:Upon clutch connection with no depression of a clutch pedal 20, a controller 22 controls a first pressure control solenoid valve 13 in accordance with a signal from a stroke sensor 21 so that the pressure of a second circuit 12 becomes higher than that of hydraulic oil Pc2, and also controls a second pressure control solenoid valve 15 so as to feed hydraulic oil Pc1 into a cylinder 6 from the circuit 12. Accordingly, the piston 3 is advanced overcoming the pressure of the hydraulic oil Pc2 so as to press a clutch disc 2 against a clutch cover 1, resulting in engagement of the clutch. When a pedal 20 is depressed, the controller 22 controls the solenoid valve 13 in association with a signal from the stroke sensor 21 so as to decrease the pressure of the hydraulic oil Pc1 while controlling the control valve 15 so as to cut off the hydraulic oil Pc2 fed into the cylinder 6, and accordingly, the piston 3 is retracted by the hydraulic oil Pc2, resulting in disengagement of the clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a control device for a hydraulic clutch of an automobile.

<Conventional technology> A clutch disc mounted on the input shaft of a flywheel fixed to the engine's crankshaft is pressed in the direction of clutch engagement by a hydraulically actuated piston mounted on the back of the flywheel, and the spring force A hydraulic clutch in which a clutch disc is biased in the direction of clutch disengagement is known, for example, from Japanese Utility Model Application No. 59-88524.

The above-mentioned hydraulic clutch has a problem in the responsiveness of clutch engagement and disengagement because the clutch engagement operation is performed by a hydraulically actuated piston, and the clutch disengagement operation is performed by a spring.

Further, the above-mentioned hydraulic clutch is a so-called dry type, and requires measures to prevent wear of the clutch disk, which is repeatedly and severely pressed by a hydraulic piston.

In order to improve these problems, the inside of the clutch cover in which the clutch desk and hydraulic piston are installed is sealed, and oil at a predetermined pressure supplied from an oil pump is circulated within this sealed space. A hydraulic clutch is provided in which pressure oil always acts on a hydraulic piston in a backward direction to disengage the clutch, and a hydraulic pressure higher than the oil pressure in the sealed space is applied to the hydraulic piston to connect the clutch. .

<Problems to be Solved by the Invention> In the wet hydraulic clutch in which the latch cover is filled with pressure oil as described above, the lubricating action of the clutch disk by the pressure oil and the responsiveness of clutch engagement and disengagement are improved. However, the control of the pressure oil for engaging and disengaging the clutch is a dedicated system that uses a computer to control the solenoid valve in the hydraulic control circuit depending on the driving conditions of the car. Although it can be mounted on vehicles equipped with a pedal, there is a problem in that conventional vehicles equipped with a clutch pedal cannot immediately respond to the demand for mounting this type of hydraulic clutch.

Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems. In a hydraulic clutch, the hydraulic clutch is equipped with a piston that presses in the direction of clutch engagement, and that constantly circulates and supplies pressurized oil that presses the piston in the direction of clutch disengagement into the clutch cover, and a pump that sucks and discharges oil from an oil tank; a first circuit communicating with the discharge side of the pump and a pressure oil supply side into the clutch cover; and a second circuit communicating with the cylinder of the piston;
A first pressure control solenoid valve is provided to control the rise and fall of the pressure in the circuit,
The second circuit is provided with a second pressure control solenoid valve for controlling the supply and discharge of pressure oil to and from the cylinder of the piston, eight clutch pedal stroke sensors are installed on the clutch pedal, and the signals of the stroke sensors are inputted. A controller for applying current to the 1.2 pressure control solenoid valve is added.

<Function> With the above configuration, the hydraulic control circuit is controlled by operating the clutch pedal, and this type of hydraulic clutch can be mounted on a vehicle equipped with a clutch pedal.

<Examples> Examples of the present invention will be described below with reference to the drawings. In FIG. 1, C is a hydraulic clutch.

This hydraulic clutch C is connected to the engine crankshaft (
A clutch cover 1 (not shown) includes a clutch disc 2 and a piston 3 that presses the clutch disc 2 in the clutch connection direction, and pressurized oil is constantly supplied to a space 4 within the clutch cover 2. It has a first passage 5 for discharging and circulating PC2, and a second passage 7 for supplying and discharging pressure oil Pc to and from the cylinder of the piston 3.

The present invention provides a hydraulic clutch C having the above configuration with a clutch pedal 2.
This is a device controlled by 0, and its configuration is as follows.

8 is an oil tank, and a filter 18 is installed inside the oil tank.

9 is an oil pump, the suction side 9a of which is connected to the oil tank 8 through a conduit 19. Further, on the discharge side 9b of the oil pump 9, a first circuit 11 communicating with the space 4 in the clutch cover 1 and a second circuit communicating with the second passage 1i47 are provided.
It is connected to the white road 12. 10 is a flow control valve, which controls the flow rate of the pressure oil discharged from the oil pump 9 to be constant. Note that if the oil pump 9 is of a variable displacement type, the flow control pulp 10 is not necessary.

A first pressure control solenoid valve 13 for controlling the pressure in the second circuit 12 to rise and fall is provided between the discharge side 9b of the oil pump 9 and the first circuit 11 and the second circuit 12. A second pressure control solenoid valve 15 is provided to control supply and discharge of pressure oil Pc to and from the cylinder 6 of the piston 3. 14
is the pressure oil PC2 supplied to the space 4 inside the clutch cover 1.
This is a relief valve that controls constant pressure.

The first passage 5 is connected to a filter 18 in the oil tank 8 through a pipe line 16, and an oil cooler 17 is connected to the pipe line 16.
is provided.

A stroke sensor 21 (for example, a differential transformer, etc.) of the clutch pedal 20 is installed in the clutch pedal 20,
The signal from this stroke sensor 21 is input to the first stroke sensor 21.
A controller 22 for applying current to two pressure control solenoid valves 13 and 15 is provided.

In addition, the 1.2 pressure control solenoid valve 13.15 and the relief valve 1
All of the discharge pressure oil of No. 4 is returned to the oil tank 8.

Next, the operation of the above configuration will be explained. The first pressure control solenoid valve 13 normally causes the pressure oil discharged from the oil pump 9 to flow into the first circuit, and reduces the pressure in the second circuit 12. The pressure oil flowing through the first circuit 11 becomes pressure oil PC2 controlled to a constant pressure by the relief valve 14, and is supplied to the space 4 in the clutch cover 1, and presses the piston 3 in the clutch disengagement direction.

Then, the pressure oil Pc2 in the space 4 is transferred from the first passage 5 to the pipe line 1.
6 to the oil tank 8 for circulation.

Therefore, when the clutch is connected without depressing the clutch pedal 20, the controller 22 controls the first pressure control solenoid valve 13 so that the pressure in the second circuit 12 becomes higher than the pressure oil Pc2 based on the signal from the stroke sensor 21, and The second pressure control solenoid valve 15 is controlled to supply the pressure oil Pct of the second circuit 12 to the cylinder 6. As a result, the piston 3 overcomes the pressure of the pressure oil PC2 and moves forward, bringing the clutch disk 2 into pressure contact with the clutch cover 1 and connecting the clutch.

When the clutch pedal 20 is depressed from this clutch connected state, the controller 22 controls the first pressure control solenoid valve 13 to lower the pressure of the pressure oil Pc based on the signal from the stroke sensor 21, and also controls the first pressure control solenoid valve 13 to lower the pressure of the pressure oil Pct to the cylinder.
The second pressure control solenoid valve 15 is controlled to cut off the supply of. As a result, the piston 3 is moved backward by the pressure oil PC2, and the clutch is disengaged.

<Effects of the Invention> As described above, according to the present invention, hydraulic control of a wet hydraulic clutch is made possible by a clutch pedal, and therefore, this type of hydraulic clutch can be mounted on a vehicle equipped with a conventional clutch pedal. This has the effect of expanding the scope of use.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, in which a control circuit is integrated into a hydraulic clutch. 1...Clutch cover, 2...Clutch disc,
3... Piston, 4... Space, 5... First passage,
6... Cylinder, 7... Second passage, 8... Oil tank, 9... Oil pump, 11... First circuit,
12... Second circuit, 13... First pressure control solenoid valve,
15... Second... Pressure control solenoid valve, 20... Clutch pedal, 21... Stroke sensor, 22...
controller.

Claims (1)

[Claims] It is equipped with a clutch disc in a clutch cover connected to the crankshaft of the engine, and a piston that presses the clutch disc in the direction of clutch engagement, and pressurized oil that presses the piston in the direction of clutch disengagement is constantly supplied within the clutch cover. In a hydraulic clutch that circulates and supplies oil, a pump that sucks and discharges oil from an oil tank, a first circuit that communicates with the discharge side of this pump and a pressure oil supply side into the clutch cover, and a second circuit that communicates with the cylinder of the piston. A first pressure control solenoid valve is provided in the first circuit to control the rise and fall of the pressure in the second circuit, and a second pressure control valve is provided in the second circuit to control the supply and discharge of pressure oil to the cylinder of the piston. A control solenoid valve is provided, a clutch pedal stroke sensor is installed on the clutch pedal, and a controller is provided that inputs a signal from the stroke sensor and applies a current to the first and second pressure control solenoid valves. Hydraulic clutch.