JPH08105459A - Hydraulic clutch release cylinder device - Google Patents

Abstract

PURPOSE: To provide a hydraulic clutch release cylinder device which is constituted to further decrease size in an axial direction and besides comparatively easily improve coupling rigidity between a plurality of linear slide actuators. CONSTITUTION: In a hydraulic clutch release cylinder device having a plurality of linear slide actuators each comprising a piston 2 and a cylinder 3 which are positioned concentrically to an input shaft S and arranged on a common periphery so that an operation force in a clutch release direction is exerted on a clutch spring DS, pressing friction clutch discs in a coupling direction, through a release bearing 5, a piston is fixed on the housing side and the cylinder is coupled to the release bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic clutch release cylinder device, and more particularly to a hydraulic clutch of a type in which a release bearing provided coaxially with an input shaft of a transmission is directly driven by a piston of a linear sliding actuator. The present invention relates to a release cylinder device.

[0002]

2. Description of the Related Art Conventionally, as a vehicular clutch, a linear sliding actuator (slave cylinder) is stroked by hydraulic pressure generated by a master cylinder directly connected to a clutch pedal, whereby a release bearing is transmitted through a release fork to a transmission. A hydraulic clutch release cylinder device configured to move along the axis of the input shaft and press the central portion of the diaphragm spring with this release bearing to displace the pressure plate is widely used.

On the other hand, the power transmission capacity of the clutch must be increased as the engine output increases, and the release operation force of the clutch also tends to increase accordingly. Therefore, in recent years, reduction of the operating force has become an important issue in designing the release mechanism of the clutch.

Based on this viewpoint, a plurality of linear sliding actuators composed of pistons and cylinders are provided on a common circumference concentric with the input shaft, so that the release bearing can be directly driven. A hydraulic clutch release cylinder device constructed is disclosed in US Pat.
Proposed in No. 8,883. This consists of fixing a plurality of cylinders on the circumference surrounding the input shaft in the clutch housing, connecting the release bearing via a power transmission member to the rod end of the piston that slides on it, and changing the hydraulic pressure of the master cylinder to It is supplied to the bottom of the cylinder to give a linear motion to each piston. By providing a plurality of linear sliding actuators around the input shaft of the transmission, a large clutch releasing action force can be obtained with a compact structure. be able to.

[0005]

In the hydraulic clutch release cylinder device described above, the hydraulic pressure supply port for the cylinder is formed in the peripheral wall of the cylinder. Therefore, in order to apply hydraulic pressure to the inner end surface of the piston of the piston, it is necessary to previously provide a gap between the cylinder bottom and the end surface of the piston, through which an extra axial dimension that does not contribute to the working stroke of the piston is provided. I have to take it. In addition, there is a demand to make the axial dimension of the piston rod as short as possible, and it is difficult to sufficiently increase the connecting rigidity between each piston rod.Therefore, if the operating speeds of multiple pistons do not match, the release bearing Inconvenience arises that the smoothness of operation is impaired.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
It is an object of the present invention to provide a hydraulic clutch release cylinder device configured so that the axial dimension can be further shortened and the coupling rigidity between a plurality of linear sliding actuators can be relatively easily increased.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an object of the present invention is to provide a clutch spring for pressing a friction clutch plate in a coupling direction with an input force in a clutch releasing direction via a release bearing. In a hydraulic clutch release cylinder device having a plurality of linear sliding actuators composed of a piston and a cylinder provided on a common circumference concentric with the shaft, the piston is fixed to the clutch housing side, and the cylinder Is connected to the release bearing.

[0008]

According to this structure, since the hydraulic pressure supply passage is provided in the central portion of the fixed piston and the hydraulic pressure can be applied from the axial end face of the piston to the bottom face of the movable cylinder, the linear sliding actuator contracts most. In this state, the piston end surface and the cylinder bottom surface can be brought into close contact with each other. Further, since the cylinder side is the movable member, the entire outer surface of the peripheral wall can be used as the joint surface with the connecting member, so that the connecting rigidity between the cylinders can be easily ensured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

FIGS. 1 and 2 show a clutch release cylinder device constructed according to the present invention. The upper side from the center line in FIG. 2 shows the clutch contact state, and the lower side shows the clutch disengagement state. There is. This clutch release cylinder device 1 is fixed on a common circumference that is concentric with the input shaft S of the transmission on the clutch housing CH side at equal intervals (in this embodiment, each of the equilateral triangles). Three pistons 2 provided at the apex, and a cylinder 3 having a bottomed tubular shape for sliding each piston 2 together,
It comprises a release bearing 5 arranged coaxially with the input shaft S of the transmission via a connecting member 4 connecting the peripheral walls of each cylinder 3.

The piston 2 is integrally erected on a base plate 6 fixed to the clutch housing CH, and a free end thereof has a seal member 7 for maintaining liquid tightness with the inner peripheral surface of the cylinder 3. Is attached, and a through hole 8 is formed in the center thereof along the axial direction.

Grooves 9 are formed in the joint surface of the base plate 6 formed integrally with the pistons 2 with the clutch housing CH so that the through holes 8 of the pistons 2 communicate with each other. And, in order to make the groove 9 a closed passage, the seal member 10a.
After sandwiching b, the end plate 12 is liquid-tightly joined via the rivet 11. Further, the groove 9 communicates with a pair of connector portions 13a and 13b provided at positions adjacent to the two pistons 2 on the base plate 6, respectively.

At the center of both connector portions 13a and 13b,
A pipe joint mounting hole 14 is opened, and an O-ring 15 is mounted on the end portion of the mounting hole 14 and a pipe joint 16 is fitted therein. A flange portion 17 is formed on the inner end of the pipe joint 16, and the pin 18 in the shape of a pin is inserted into the connector portions 13a and 13b so as to press the flange portion 17 to remove the pipe joint 16. It has been stopped.
In addition, one connector portion 13a is connected to a master cylinder (not shown), and the other connector portion 13b is connected to an air vent plug.

The cylinder 3 is formed by deep drawing a metal material, and has a cup-like shape with an outward flange 19 provided at the opening end. These three cylinders 3 are integrally connected by a connecting member 21 provided at each apex of an equilateral triangle with holes 20 for tightly receiving the respective peripheral walls.

A connecting member 21 that connects three cylinders 3
An insertion hole 22 for the input shaft S is formed at the center of the release shaft 5, and the release bearing 5 is supported by an inward flange 23 provided at the axially intermediate portion of the insertion hole 22. Further, the connecting member 21 connects the inward flange 23 and the base plate 6 so as to press the release bearing 5 following the inner end position of the diaphragm spring DS which is displaced according to the wear of the clutch facing (not shown). Preload spring 2 compressed between
4, it is constantly urged with a low load in the pushing direction.

A contact flange 25, which faces outward in the radial direction, is fixed to the inner race of the release bearing 5. The release bearing 5 is configured such that the three claws 27 extending from the ring member 26 that is in contact with the outer race are engaged with the corresponding portions of the connecting member 4,
It is locked out. Reference numeral BH in FIG. 1 indicates a bearing housing of the counter shaft.

Next, the operation of the above embodiment will be described. When the clutch pedal is not depressed, that is, when the hydraulic pressure is not applied, the release bearing 5 and the connecting member 21 supporting the release bearing 5 are on the clutch housing CH side by being pressed by the diaphragm spring DS. In this state, the piston 2 is recessed in the cylinder 3, and the pressure plate (not shown) presses the clutch disc toward the flywheel by the reaction force of the diaphragm spring DS, and the power of the engine is transmitted to the transmission. introduce. As the clutch disc wears, the center of the diaphragm spring DS is displaced toward the clutch housing CH, and the piston 2 with respect to the cylinder 3
Although the amount of immersion of the piston increases, the state shown from the center line to the upper side of FIG. 2 shows the state where the piston 2 is fully immersed in the cylinder 3 due to the total wear of the clutch disc, which is the initial state. When the clutch is in contact, the piston 2 is set to be retracted to a substantially intermediate position of the cylinder 3.

When the clutch pedal is stepped on, hydraulic pressure from a master cylinder (not shown) is applied to one connector portion 1
Hydraulic pressure is applied to the inner surface of the bottom wall of each cylinder 3 from the through hole 8 of each piston 2 via the pipe joint 16 and the groove 9 to push out each cylinder 3. As a result, the release bearing 5 is pushed out together with the connecting member 4 integrally connected to the cylinder 3, and the central portion of the diaphragm spring DS is pressed to release the pressing force of the pressure plate. This disengages the clutch disc from the flywheel and interrupts the transmission of engine power to the transmission.

[0019]

As described above, according to the present invention, since the hydraulic pressure supply passage is provided in the central portion of the fixed piston and the hydraulic pressure can be applied to the bottom surface of the movable cylinder from the axial end surface of the piston, the linear slide actuator is provided. The piston end face and the cylinder bottom face can be brought into close contact with each other in the most contracted state. Further, since the cylinder side is the movable member, the entire outer surface of the peripheral wall can be used as the joint surface with the connecting member, so that the connecting rigidity between the cylinders can be easily ensured. As a result, since the interlocking error between the plurality of linear sliding actuators can be reduced, the smoothness of operation of the release bearing is not impaired, and there is no need to provide an extra portion that does not contribute to the stroke in the linear sliding actuator. The axial dimension of the clutch release cylinder device can be reduced. In addition, since the radial dimension of the portion between the two cylinders from the center of the input shaft can be reduced, interference with the bearing housing of the counter shaft shown by the phantom line in FIG. 1 can be avoided. There is also an effect that it contributes to downsizing of a transmission for a front-wheel drive vehicle, which has a large restriction.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a clutch release cylinder device according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

[Explanation of symbols]

 BH Counter shaft bearing housing CH Clutch housing DS Diaphragm spring S Input shaft 1 Clutch release cylinder device 2 Piston 3 Cylinder 4 Connecting member 5 Release bearing 6 Base plate 7 Sealing member 8 Through hole 9 Grooves 10a, 10b Sealing member 11 Rivet 12 End plate 13a / 13b Connector part 14 Pipe joint mounting hole 15 O-ring 16 Pipe joint 17 Collar part 18 Pin 19 Outward flange 20 Hole 21 Connecting member 22 Insertion hole 23 Inward flange 24 Preload spring 25 Contact flange 26 Ring member 27 Claw

Claims (1)

[Claims] 1. A piston provided on a common circumference that is concentric with the input shaft to apply a clutch release direction acting force to a clutch spring that presses a friction clutch plate in a coupling direction via a release bearing. A hydraulic clutch release cylinder device having a plurality of linear sliding actuators including a cylinder, wherein the piston is fixed to a clutch housing side, and the cylinder is connected to the release bearing. Release cylinder device.