JPH0819986B2 - Control device for hydraulic clutch - Google Patents

Description

TECHNICAL FIELD The present invention relates to a control device for a hydraulic clutch of an automobile.

<Prior Art> A flywheel fixed to a crankshaft of an engine is provided with a clutch disc provided on an input shaft.
A hydraulic clutch in which a hydraulically actuated piston provided on the back side of the clutch is pressed in the clutch connecting direction to press the clutch disc in the clutch disengaging direction by a spring force is known, for example, from Japanese Utility Model Publication No. Sho 59-88524.

In the hydraulic clutch described above, a hydraulically actuated piston is used to engage and disengage the clutch, but the clutch disengagement operation is performed by a spring, so that there is a problem in the responsiveness of clutch engagement and disengagement.

Further, the hydraulic clutch is a so-called dry type, and it is necessary to take measures against wear of the clutch disc that is repeatedly and severely pressed by the hydraulic piston.

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

<Problems to be Solved by the Invention> In the wet hydraulic clutch in which the pressure oil is filled in the clutch cover as described above, the lubrication action of the clutch desk by the pressure oil and the responsiveness of the adjacent clutch are improved. However, the control of the pressure oil for engaging and disengaging the clutch can be a dedicated system that controls the solenoid valve of the hydraulic control circuit by a computer according to the driving conditions of the automobile, etc. There is a problem that it cannot be mounted on a vehicle equipped with a pedal, and a conventional vehicle equipped with a clutch pedal cannot immediately meet the demand for mounting a hydraulic clutch of this type.

<Means for Solving the Problems> The present invention has been made to solve the above problems, and a clutch disc in a clutch cover connected to a crankshaft of an engine and the clutch disc are provided. In a hydraulic clutch that includes a piston that presses in the clutch connecting direction, and that constantly supplies pressure oil that presses the piston in the clutch disengagement direction in the clutch cover, a pump that sucks and discharges oil in an oil tank, and A first circuit communicating with a discharge side of the pump and a pressure oil supply side into the clutch cover; and a second circuit communicating with a cylinder of a piston, the first circuit controlling the pressure of the second circuit up and down A pressure control solenoid valve is provided, and a second pressure control solenoid valve for controlling the supply and discharge of pressure oil to and from the cylinder of the piston is provided in the second circuit. A clutch pedal stroke sensor is installed on the latch pedal, and a controller for inputting a signal from the stroke sensor to apply a current to the first and second pressure control solenoid valves is provided.

<Operation> 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 with a clutch pedal.

<Examples> Examples of the present invention will be described below with reference to the drawings. First
In the figure, C is a hydraulic clutch. This hydraulic clutch C includes a clutch disc 2 in a clutch cover 1 connected to a crankshaft (not shown) of an engine,
A first passage 5 provided with a fixer 3 for pressing the clutch disc 2 in the clutch connecting direction and for discharging and circulating the pressure oil Pc ₂ constantly supplied to the space 4 in the clutch cover 2.
And a second passage 7 for supplying / discharging the pressure oil Pc ₁ to / from the cylinder 6 of the piston 3.

The present invention uses the hydraulic clutch C having the above-mentioned configuration as a clutch pedal.
It is a device controlled by 20, and its configuration is as follows.
Reference numeral 8 denotes an oil tank in which a filter 18 is installed.

Reference numeral 9 is an oil pump, and its suction side 9a and the oil tank 8 are connected by a pipe line 19. A first circuit 11 communicating with the space 4 in the clutch cover 1 and a second circuit 12 communicating with the second passage 7 are connected to the discharge side 9b of the oil pump 9. A flow control valve 10 controls the flow rate of the pressure oil discharged from the oil pump 9 to be constant. If the oil pump 9 is a variable displacement type, the flow control valve 10 is unnecessary.

A first control for raising and lowering the pressure of the second circuit 12 between the discharge side 9b of the oil pump 9 and the first circuit 11 and the second circuit 12.
A pressure control solenoid valve 13 is provided, and the second circuit 12 is provided with a second pressure control solenoid valve 15 that controls the supply and discharge of the pressure oil Pc ₁ to and from the cylinder 6 of the piston 3. Reference numeral 14 is a relief valve for controlling the pressure oil Pc ₂ supplied to the space 4 in the clutch cover 1 at a constant pressure.

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

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

The first and second pressure control solenoid valves 13 and 15 and the relief valve 14
All the discharged pressure oil is recirculated to the oil tank 8.

Next, the operation of the above configuration will be described. 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 lowers the pressure in the second circuit 12. First circuit 11
The pressure oil flowing therethrough becomes pressure oil Pc ₂ controlled to a constant pressure by the relief valve 14, is supplied to the space 4 in the clutch cover 1, and presses the piston 3 in the clutch disengagement direction. The pressure oil Pc ₂ in the space 4 is circulated from the first passage 5 to the oil tank 8 via the pipe 16 and circulates.

Therefore, in the clutch connection in which the clutch pedal 20 is not depressed, the controller 22 controls the first pressure control solenoid valve 13 so that the pressure of the second circuit 12 becomes higher than the pressure oil Pc ₂ by the signal of the stroke sensor 21, The second circuit 12
The second pressure control solenoid valve 15 is controlled so as to supply the pressure oil Pc _{1 of 2} to the cylinder 6. As a result, the piston 3 receives pressure oil Pc ₂
Then, the clutch desk 2 is pressed against the clutch cover 1 to connect the clutch.

When the clutch pedal 20 is depressed from this clutch connected state, the controller 22 is activated by the signal from the stroke sensor 21.
Is the first pressure control solenoid valve 13 to reduce the pressure of the pressure oil Pc _1.
The second pressure control solenoid valve 15 is controlled so as to cut off the supply of the pressure oil Pc ₁ to the cylinder 6. As a result, the piston 3 is moved backward by the pressure oil Pc ₂ , and the clutch is disengaged.

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

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which a hydraulic clutch and a control circuit are incorporated. 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 ... 2 circuits, 13 ...
1st pressure control solenoid valve, 15 ... 2nd ... pressure control solenoid valve, 20
...... Clutch pedal, 21 …… Stroke sensor, 22 ……
controller.

Claims (1)

[Claims] 1. A clutch disc in a clutch cover connected to a crankshaft of an engine, and a piston for pushing the clutch disc in a clutch connecting direction. The piston is pushed in the clutch cover in a clutch disengaging direction. In a hydraulic clutch that constantly circulates pressure oil to be supplied, a pump that sucks and discharges oil from an oil tank, a first circuit that communicates with a discharge side of this pump and a pressure oil supply side into the clutch cover, and a cylinder of a piston And a second circuit communicating with the first circuit, the first circuit is provided with a first pressure control solenoid valve for controlling the pressure of the second circuit to rise and fall, and the second circuit supplies and discharges pressure oil to the cylinder of the piston. A second pressure control solenoid valve for controlling is provided, and a stroke sensor for the clutch pedal is installed on the clutch pedal. Hydraulic clutch, characterized in that it comprises a controller which inputs a signal to apply a current to the first and second pressure control solenoid valve.