JPS62242135A - Clutch control device - Google Patents

Abstract

PURPOSE:To facilitate countermeasure against abrasion of a clutch plate and attachment process of a device by driving the hydraulic piston of a master cylinder by the use of an electric driving means and providing a compensator which offsets clutch reaction by acting on the hydraulic piston. CONSTITUTION:The pinion 19 of an electric driving device 12 which is formed of an electric motor 13 and a gearing 14 is engaged with a rack part 20 which is formed in a hydraulic piston 4. And a compensator 21 is formed of a spring 23 and a lever 22 fixed on the rotating and moving shaft 18 of the gearing 14, and an elastic force for offsetting a clutch reaction is acted on a hydraulic piston 4. The hydraulic piston 4 is moved from the top dead point A to the direction toward the bottom dead point B and the oil pressure of an oil pressure chamber 6 is lowered when a motor 13 is driven thereat, and when the piston 4 moves further oil is supplied in the oil pressure chamber 6 from an oil tank 8 and the hydraulic piston 4 is moved down the bottom dead point B to be connected to a clutch. Accordingly, a clutch plate is easily protected from being worn and a device is easily attached.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling a clutch in an automobile or the like.

(Prior Art) Conventionally, as a clutch control device, a hydraulic system having a master cylinder and a slave cylinder is well known, but on the other hand, an electric control system is disclosed in Japanese Patent Application Laid-Open No. 184621/1983. . This is equipped with an electric motor and a gear system to transmit the driving force of this electric motor to the fork of the clutch, and is also equipped with a compensator spring to offset the clutch reaction force, controlling the clutch with a small driving force. It is now possible to do so.

(Problem to be solved by the invention) However, in this conventional example, the clutch is directly controlled by an electric motor without going through a hydraulic system, so the device is large and difficult to install on an existing vehicle. This has the problem that it is not compatible with commonly used hydraulic cylinder systems, and that when the clutch plate wears out, the direction of action of the compensator spring shifts, requiring readjustment to balance it with the clutch reaction force. there were.

Therefore, in this invention, by using hydraulic pressure, it is possible to freely install the device in a position that makes it easy to install, maintains compatibility with conventional hydraulic cylinders, and eliminates the need for adjustment even when the clutch plate wears out. The object of the present invention is to provide a clutch control device.

(Means for Solving the Problems) Therefore, the gist of the present invention is to have a cylinder block and a hydraulic piston fitted into the cylinder block, and a hydraulic piston surrounded by the cylinder block and the hydraulic piston. a master cylinder in which a hydraulic chamber is formed and an oil supply port that opens into the hydraulic chamber at a predetermined stroke of the hydraulic piston is formed in the cylinder block; an oil tank connected to the oil supply port of the master cylinder; a slave cylinder connected to the hydraulic chamber of the master cylinder via a hydraulic passage; an electric drive means for driving the hydraulic piston of the master cylinder; and an elastic force that offsets the clutch reaction force from the slave cylinder. A clutch control device includes a compensator that acts on a piston, and a stroke sensor that detects the position of the hydraulic piston.

(Operation) Therefore, according to the present invention, the electric motor moves the hydraulic piston of the master cylinder to generate oil pressure, and this master cylinder oil pressure is transmitted to the slave cylinder, thereby controlling the clutch. The position can be freely set, and the same slave cylinder as in the past can be used. Even if the clutch plate is worn out, by moving the piston position of the master cylinder to the hydraulic pressure supply port, oil equivalent to the amount of wear can be supplied to the hydraulic chamber.Therefore, the above problem can be achieved. be.

(Example) In FIG. 1, a master cylinder 1 has a cylinder bore 2.
The cylinder block 3 has a cylinder block 3 formed therein. A hydraulic piston 4 is slidably inserted into the cylinder pore 2 of the cylinder block 3.

This hydraulic piston 4 is stroked between a top dead center A and a bottom dead center B by an electric drive means 12, which will be described later. Further, one end of the cylinder bore 2 is closed by a joint 5, and a hydraulic chamber 6 is constituted by being surrounded by the cylinder block 3, hydraulic piston 4, and joint 5, and the volume of the hydraulic chamber 6 changes depending on the position of the hydraulic piston 4. . Further, an oil supply lower is formed in the cylinder block 3 near the bottom dead center B of the hydraulic piston 4.

The oil tank 8 is connected to the oil supply lower, and when the hydraulic piston 4 is near the bottom dead center B, the oil supply lower opens into the cylinder pore 2, and the oil stored in the core oil tank 8 flows into the hydraulic chamber 6.
is being supplied to.

The slave cylinder 9 is attached to the clutch body 10 and connected to the hydraulic chamber 6 of the master cylinder 1 via a hydraulic passage 11, and is driven by the hydraulic pressure from the master cylinder 1 to move a clutch plate in the clutch body 10. The internal structure of the clutch itself is the same as the conventional one, so a detailed explanation will be omitted, but when the hydraulic piston 4 is at top dead center A, the clutch is disengaged to prevent power transmission, and when the hydraulic piston 4 is at bottom dead center B. At certain times, the clutch is connected to transmit power, and at times other than when the piston is at the bottom dead center B, a clutch reaction force that presses the hydraulic piston 4 toward the bottom dead center B acts on the hydraulic chamber 4. do.

The electric drive means 12 includes an electric motor 13 and a gear bag f that transmits the driving force of the electric motor 13 to the hydraulic piston 4.
14. The electric motor 13 has an output shaft 13a that rotates in forward and reverse directions, and this output shaft 13a projects into the housing 15. The gear device 14 includes a worm gear 16 fixed to the output shaft 13a of the electric motor 13, a worm wheel 17 meshing with the worm gear 16, and a pinion 19 fixed to the rotating shaft 18 integrally with the worm wheel 17. have This pinion 19 meshes with a rack portion 20 formed on the hydraulic piston 4 described above.

The compensator 21 is for applying an elastic force to the hydraulic piston 4 to offset the clutch reaction force, and includes a lever 22 whose one end is fixed to a portion of the aforementioned rotary wheel 18 that protrudes outside the housing 15. It has a spring 23 connected to. A first engagement shaft 24a is provided near the other end of the lever 22, and a first engagement shaft 24a is provided near the other end of the lever 22.
A second locking shaft 24b is provided on the fixed portion 25 formed in the portion 5, and both ends of the spring 23 are engaged with the first locking shaft 24a and the second engaging shaft 24b. There is.

Therefore, assuming that the lever 22 rotates counterclockwise with the first engagement shaft 24a, rotation shaft 18, and second engagement shaft 24b being in a straight line as 0 degrees, then The spring force acting on the hydraulic piston 4 toward the top dead center with respect to the lever angle θ increases as the lever angle θ becomes thicker, as shown in FIG. The maximum value is reached slightly before the 90 degree position.

The stroke sensor 26 is connected to the cylinder block 3 described above.
A variable resistor 28 is provided at the other end and inside the sensor body 27.
is located. The variable resistor 28 includes a movable contact 30 connected to the hydraulic piston 4 via a rod 29 and a fixed contact 31 made of a resistor on which the movable contact 30 slides. The position is output as a voltage value to a control unit (not shown) for controlling the electric motor 13, and the output signal is used for feedback control.

In the above configuration, from the state shown in FIG.
3 to rotate its output shaft 13a in one direction, the driving force is transferred to the master cylinder 1 via the gear device 14.
The pressure is transmitted to the hydraulic piston 4, which moves from the top dead center A toward the bottom dead center B, and the hydraulic pressure in the hydraulic chamber 6 decreases. The hydraulic pressure is transmitted to the slave cylinder 9 through the hydraulic passage 11 to move the clutch, and when the hydraulic piston 4 moves further, the oil supply lower opens into the cylinder bore 2 and oil is supplied from the oil tank 8 to the hydraulic chamber 6. Due to the replenishment, the hydraulic piston 4 moves to the bottom dead center B, and the clutch is connected.

Next, when the output shaft 13a of the electric motor 13 is reversely rotated,
The hydraulic piston 4 moves from the bottom dead center B to the top dead center six directions via the gear system 14 and closes the oil supply lower, so the oil pressure in the hydraulic chamber 6 increases, and this is transferred to the slave cylinder via the hydraulic passage 11. 9 to disengage the clutch.

° When controlling the clutch in this way, as mentioned above, when the hydraulic piston 4 is at the top dead center A, the clutch reaction force is large, while the hydraulic piston 4 has an equally large spring force in the opposite direction. acts, and when the hydraulic piston 4 is at the bottom dead center B, the clutch reaction force is O, but only the minimum spring force acts on the hydraulic piston 4, so the clutch reaction force is always offset by the spring force. Therefore, the driving force of the electric motor 13 may be small enough to be slightly larger than the difference between the two.

When the clutch plate wears, the position of top dead center A moves to the left in Figure 1, but the hydraulic piston 4 is returned to position B and the insufficient oil is supplied from the oil tank 8 to the hydraulic chamber 6 through the oil supply lower. This allows the clutch to be connected and disconnected while keeping the original piston position.

(Effects of the Invention) As described above, according to the present invention, since the electric drive means and the compensator are provided on the master cylinder side,
The conventional slave cylinder can be used as is,
Compatibility can be maintained.

In addition, by providing an oil tank at a location where it can automatically supply insufficient oil to the hydraulic chamber, it is possible to cope with wear of the clutch plates.

4. Brief Description of the Drawings □ Fig. 1 is a sectional view showing an embodiment of the present invention, and Fig. 2 is a characteristic diagram showing changes in spring force with respect to lever angle.

l...Master cylinder, 3...Cylinder block,
4... Hydraulic piston, 6... Hydraulic chamber, 7... Oil supply port, 8... Oil tank, 9... Slave cylinder,
11... Hydraulic passage, 12... Electric drive means, 13
... Electric motor, 14 ... Gear device, 15 ... Housing, 16 ... Worm gear, 17 ... Worm wheel, 18 ... Rotation shaft, 19 ... Pinion,
20... Rack section, 21... Compensator, 22
...Lever, 23...Spring, 26...Stroke sensor.

Claims (1)

[Scope of Claims] 1. A cylinder block and a hydraulic piston fitted into the cylinder block, a hydraulic chamber surrounded by the cylinder block and the hydraulic piston, and a predetermined stroke of the hydraulic piston. A master cylinder having an oil supply port opening into the hydraulic chamber formed in the cylinder block, an oil tank connected to the oil supply port of the master cylinder, and an oil tank connected to the hydraulic chamber of the master cylinder via a hydraulic passage. a slave cylinder, an electric drive means for driving the hydraulic piston of the master cylinder, a compensator for applying an elastic force to the hydraulic piston to offset a clutch reaction force from the slave cylinder, and a detecting position of the hydraulic piston. A clutch control device comprising: a stroke sensor for detecting a stroke; 2. The electric drive means includes an electric motor having an output shaft;
Claim 1 comprising a gear device connecting the output shaft of the motor and a hydraulic piston.
Clutch control device as described in section. 3. The clutch control device according to claim 2, wherein the hydraulic piston of the master cylinder is formed with a rack portion, and a pinion forming a gear device is engaged with the rack portion. 4. The gear device is characterized by comprising a worm gear fixed to the output shaft of the electric motor, a worm wheel meshing with the worm gear, and a pinion fixed to the rotation shaft integrally with the worm wheel. Clutch control device according to claim 2 or 3. 5. The compensator consists of a lever provided on the rotating shaft,
5. The clutch control device according to claim 4, further comprising a spring having one end rotatably fixed to the lever and the other end rotatably fixed to the housing.