JPH04296226A - Clutch operating system for vehicle - Google Patents

Abstract

PURPOSE:To prevent any motion of a releasing bearing to be produced at any time from being transmitted to a piston directly even at a time when a clutch releasing member is partially hit on the releasing bearing. CONSTITUTION:A ring piston 21 is inserted into a ring cylinder chamber 20 installed at the side of a fixed support wall 14. A releasing bearing 11, pushing and operating a releasing member 10 of a clutch 4, is installed in a bearing support cylinder 25 which is separated from the piston 21 and installed at the side of the support wall 14 free of slide motion in the axial direction. A receiver plate 35, with which the piston 21 is made contact at time of pushing, is installed in the bearing support cylinder 25 free of slide motion in the axial direction, and an elastic body 38 is interposed between this receiver plate 35 and the bearing support cylinder 25.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch operating device for a vehicle such as a tractor.

0002

[Prior Art] In vehicles such as tractors, in addition to mechanical clutch operating devices that operate the main clutch interposed between the output shaft of the engine and the propulsion shaft, clutch pedals are also used to operate the master cylinder. There are hydraulic types that are actuated and operated. This hydraulic clutch operating device is equipped with an annular cylinder chamber concentrically with the propulsion shaft on the side of a fixed support wall fitted externally to the propulsion shaft. Insert the piston, install a release bearing on the bearing support at the tip of the piston,
When the clutch pedal is depressed, pressure oil is supplied from the master cylinder to the cylinder chamber to cause the piston to slide, and the release bearing pushes the release member to disengage the clutch.

[0003] Conventionally, the piston and the bearing support have been made integrally, and the piston is inserted into a cylinder chamber with an appropriate gap between the inside and outside, and the gap between the inner and outer peripheries is sealed with an oil seal.

0004

[Problem to be solved by the invention] Clutch release member,
For example, in the case of a lever type, there are a plurality of release levers in the circumferential direction, and when the clutch is partially engaged or disengaged, the inner end side of each release lever is pushed by a release bearing. However, due to variations in manufacturing, etc., it is very difficult to line up the inner end portions of each release lever at the same position in the axial direction. Therefore, when the clutch is in a half-clutch state, some of the plurality of release levers may not come into contact with the release bearing and may remain separated from the release bearing. In other words, it is a one-sided state.

[0005] If such a one-sided contact condition occurs, the release bearing will not necessarily rotate smoothly around the axis of the propulsion shaft, but will move eccentrically. Therefore, the movement of the release bearing is transmitted to the piston via the bearing support.
When the piston moves unstably in the axial direction within the cylinder chamber, causing pressure fluctuations, or when working in a half-clutch state, the oil seal wears or breaks, causing problems such as oil leakage.

In view of such conventional problems, the present invention prevents the eccentric movement of the release bearing from being transmitted to the piston even when a partial contact condition occurs in which the release member does not contact the release bearing evenly, The purpose is to prevent pressure fluctuations or oil seal wear and damage.

[0007]

[Means for Solving the Problems] The present invention provides a clutch 4
An annular cylinder chamber 20 is provided concentrically with the propulsion shaft 3 on the side of a fixed support wall 14 fitted externally to the propulsion shaft 3 which is linked to the engine through the cylinder chamber 20, and is slidable in the axial direction. An annular piston 21 is fitted into the piston 2.
In the clutch operating device for a vehicle in which the clutch 4 is disengaged by pushing the release member 10 through the release bearing 11 according to 1, the bearing support cylinder 25 supporting the release bearing 11 is separated from the piston 21 and supported. A contact plate 3 is provided on the wall 14 side so as to be freely slidable in the axial direction, and the piston 21 comes into contact with the bearing support tube 25 during a pushing operation.
5 is provided to be slidable in the axial direction, and an elastic body 38 is interposed between this contact plate 35 and the bearing support tube 25, which is compressed during a pushing operation.

[0008]

[Operation] When half-clutching or disengaging, the piston 21 moves the bearing support cylinder 25 through the contact plate 35 and the elastic body 38.
is pressed, and the release bearing 11 supported by the release member 10 is pushed to partially engage or disengage the clutch 4. If the release member 10 makes partial contact with the release bearing 11 when the clutch is half-engaged, the release bearing 11 moves eccentrically. However, since the release bearing 11 is supported by a bearing support cylinder 25 that is separated from the piston 21 and provided on the support wall 14 side, the release bearing 11
Even if the eccentric movement occurs, it is not directly transmitted to the piston 21. In particular, since there is an elastic body 38 between the contact plate 35 and the bearing support tube 25, the movement of the bearing support tube 35 can be absorbed by this. Therefore, the piston 21 does not move unstablely, and pressure fluctuations in the cylinder chamber 20 and oil seals 22 and 23 are prevented from being worn out or damaged.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the invention. In FIG. 1, 1 is the output shaft of the engine, and 2 is a flywheel fixed to the output shaft 1. 3 is a propulsion shaft of the running system, which is linked to the output shaft 1 of the engine via a dry single plate clutch 4.

The clutch 4 includes a clutch cover 5 fixed to the flywheel 2 , a clutch plate 6 splined to the propulsion shaft 3 , a press plate 7 sandwiching the clutch plate 6 between the flywheel 2 and the press plate 7 . It is comprised of a coil spring 8 interposed between the clutch cover 5 and the clutch cover 5 to bias it toward the wheel 2, a release lever (release member) 10 pivotally supported on the clutch cover 5 by a pin 9, and the like. There are a plurality of release levers 10 in the circumferential direction, and when the inner end of the release lever 10 is pushed and operated by the release bearing 11, the pressing plate 7 moves backward against the coil spring 8, so that the clutch 4 is partially engaged or disconnected. It has become.

12 is a clutch housing, and 13 is a transmission case, which are separated by a fixed support wall 14. The support wall 14 is an inner cylindrical portion 1 that fits onto the propulsion shaft 3.
5, and a propulsion shaft 3 is connected to this inner cylinder portion 15 via a bearing 16.
is supported. Reference numeral 17 denotes an outer cylinder, which is fitted onto the inner cylinder part 15 and has a flange part 18 fixed to the support wall 14 with bolts 19.

An annular cylinder chamber 20 is formed between the inner cylinder part 15 and the outer cylinder 17 concentrically with the propulsion shaft 3, and an annular piston 21 is slidable in the axial direction in this cylinder chamber 20. is covered with. Note that there is a slight gap between the inside and outside of the piston 21, and this gap is between the oil seals 22 and 23.
It is sealed by. 24 is a dust seal. Reference numeral 25 denotes a bearing support cylinder, which is constructed separately from the piston 21 and is fitted onto the outer cylinder 17 so as to be slidable in the axial direction. The bearing support tube 25 has an intermediate wall portion 26
A small diameter bearing receiving portion 34 is provided at the tip via a small diameter bearing receiving portion 34, and the release bearing 11 is fitted into this bearing receiving portion 34.

35 is an annular contact plate, as shown in the second figure,
The piston 21 is interposed between the piston 21 and the wall 26 of the bearing support cylinder 25, and is supported slidably in the axial direction by a plurality of circumferential flanged collars 37 fixed to the wall 26 by bolts 36. There is. The piston 21 can come into contact with this contact plate 35 during a pushing operation, and between the contact plate 35 and the wall 26 of the bearing support cylinder 25, there are elastic bodies 38, 39 that are compressed during the pushing operation. are interposed concentrically inside and outside.

The inner elastic body 38 has a large dimension in the axial direction, and has a weight of approximately 100 kg between the step portion 40 formed in the wall portion 26 and the annular groove 41 formed in the contact plate 35. /cm
It is inserted with a preload of about 2. The elastic body 39 on the outer periphery expands in the rear direction, and
It is glued to the backing plate 35 so that there is a gap between the two. The elastic bodies 38 and 39 are made of rubber or the like.

27 is a PTO system propulsion shaft directly connected to the output shaft 1, and 28 is a hydraulic clutch for the traveling system. A clutch pedal 29 is pivotally supported by a pin 30, and when the clutch pedal 28 is depressed, the master cylinder 31
Pressure oil is supplied from the cylinder chamber 20 to the cylinder chamber 20 via an oil passage 32. 33 is a rotation stopper pin of the bearing support cylinder 25. In the above configuration, when the clutch pedal 29 is depressed, pressure oil is supplied from the master cylinder 31 to the cylinder chamber 20, and the piston 21 moves forward and comes into contact with the contact plate 35. Then, when the piston 21 moves further forward, since the contact plate 35 is slidably supported by the collar 37, it pushes the bearing support cylinder 25 forward via the elastic body 38, so that the release bearing 11 moves the release lever 10. The inner end side is pushed forward, and the clutch 4 is partially engaged or disengaged.

At this time, if the plurality of release levers 10 do not evenly contact the release bearing 11 and uneven contact occurs, the release bearing 11 moves eccentrically. However, since the bearing support cylinder 25 is separated from the piston 21 and provided on the outer cylinder 17 side, the eccentric movement of the release bearing 11 is not directly transmitted to the piston 21. In other words, the eccentric movement can be absorbed by the bearing support cylinder 25.

Furthermore, when the clutch is in a half-clutch state, the elastic body 38 is in a compressed state and the elastic body 39 is not in contact with the wall portion 26, so even if the bearing support tube 25 moves due to the eccentric movement of the release bearing 11, the elastic body 38 is in a compressed state. The movement of the bearing support cylinder 25 can be absorbed by elastic deformation. Therefore, the piston 21 does not move unstablely, and pressure fluctuations on the cylinder wall 20 or the oil seal 22,
23 can be prevented from being worn or damaged, leakage of pressure oil into the clutch housing 12, and accompanying slipping of the clutch 4 can be prevented.

When the clutch 4 is disengaged, the elastic body 38 is further compressed, and the elastic body 39 is pressed against the bearing support cylinder 2.
5 and comes into contact with the wall 26 of No. Therefore, the bearing support tube 2
5 is pushed and operated by the contact plate 35 via the elastic bodies 38 and 39. At this time, the contact plate 35 may be brought into contact with the wall portion 26. If the elastic body 38 is interposed in a compressed state, the contact plate 35
The gap between the wall portion 26 and the wall portion 26 can be minimized, and miniaturization is possible.

FIG. 3 shows a second embodiment of the present invention, in which a headed pin 43 is used in place of the bolt 36 and collar 37 to support the backing plate 35. The pin 43 is slidably inserted into a hole formed in the wall 26 and the contact plate 35 from the wall 26 side, and a retaining ring 44 is fitted to the protruding end thereof. In this way, it is easier than using the bolt 36 and collar 37.

Note that the clutch 4 may be of a diaphragm type. Further, the elastic body 39 may be omitted and only the elastic body 38 may be used, or in the case of only the elastic body 38, it may be incorporated without preloading.

[0021]

According to the present invention, the bearing support cylinder 25 that supports the release bearing 11 is separated from the piston 21 and is provided slidably in the axial direction on the support wall 14 side. A contact plate 35 that contacts during the pushing operation is provided to be slidable in the axial direction, and an elastic body 38 that is compressed during the pushing operation is interposed between the contact plate 35 and the bearing support tube 25. Eccentric movement of the release bearing 11 is not directly transmitted to the piston 21, and it is possible to prevent wear or damage of the oil seals 22, 23 inside and outside the piston 21, and also to prevent pressure fluctuations from occurring. Further, since a contact plate 35 is slidably provided on the bearing support tube 25 and an elastic body 38 is interposed between the contact plate 35 and the bearing support tube 25, the elastic body 38 can be brought into a compressed preloaded state. is also easy.

[Brief explanation of drawings]

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

FIG. 2 is an enlarged view of the main part of FIG. 1;

FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

2 Flywheel 3 Propulsion axis 4 Clutch 10 Release lever 11 Release bearing 14 Supporting wall 17 Outer cylinder 20 Cylinder chamber 21 Piston 25 Bearing support tube 35　Touching board 37 Collar with collar 38 Elastic body 39 Elastic body

Claims (1)

[Claims] Claim 1: A fixed support wall (1) fitted externally to a propulsion shaft (3) that is linked to an engine via a clutch (4).
On the 4) side, an annular cylinder chamber (20) is provided concentrically with the propulsion shaft (3), and an annular piston (21) is fitted into this cylinder chamber (20) so as to be slidable in the axial direction. A bearing that supports a release bearing (11) in a clutch operating device for a vehicle that disengages a clutch (4) by pushing a release member (10) via a release bearing (11) with a piston (21). Support tube (25
) is separated from the piston (21) and provided slidably in the axial direction on the support wall (14) side, and a contact plate (35) is provided on the bearing support tube (25) with which the piston (21) comes into contact during a pushing operation.
) is provided to be slidable in the axial direction, and an elastic body (38) that is compressed during a pushing operation is interposed between the contact plate (35) and the bearing support tube (25). clutch operating device.