JP2536953Y2 - Clutch release device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention mainly relates to a clutch release device for a vehicle clutch.

[Conventional technology]

In recent years, in order to secure a clutch set load (clutch cover attachment load) accompanying an increase in engine output, there has been a tendency for the clutch pedal depression force to increase. As a countermeasure against this, various devices for reducing the depression force on the clutch pedal have been proposed.

For example, Japanese Utility Model Laid-Open Publication No. 61-64033 discloses a tread force reducing device in which a torsion coil spring performing a turnover function is assembled between a clutch pedal and a pedal bracket supporting the clutch pedal. According to this device, when the clutch pedal is depressed to a predetermined position, the coil spring acts in a direction to assist the pedal depressing force, thereby reducing the depressing force.

[Problems to be solved by the invention]

The treading force reducing device disclosed in the above publication requires a coil spring having an elastic force substantially equal to the assist force required on the clutch pedal. That is, a large coil spring is required to obtain a large assist force. For this reason, the production cost is increased, and it is difficult to secure such a large spring arrangement space around the clutch pedal.

One object of the present invention is to increase the set load of the turnover mechanism that acts on the release bearing and to ensure a large assist force.

Another object of the present invention is to increase the degree of freedom of the set load of the turnover mechanism acting on the release bearing and to enable fine adjustment of the assist force.

[Means for solving the problem]

In order to solve the above problems, the clutch release device according to the present invention is configured as follows.

1. When the pedal depression force is applied, the release bearing located in the clutch housing is slid to the clutch cover side to disconnect the clutch, and when the pedal depression force is released, the release bearing In the clutch release device that is pushed back by the set load on the cover side and the clutch is in the connected state,
A turnover mechanism having a switching point with respect to the sliding direction of the release bearing is provided in a space on the outer peripheral portion of the release bearing in the clutch housing, and the turnover mechanism has a release bearing on one side bounded by the switching point. It is set so as to exert a force for sliding toward the clutch cover side and a force for sliding the release bearing away from the clutch cover side on the opposite side.

2. The clutch release device as described in 1 above, wherein the turnover mechanism is disposed between the release bearing or the bearing hub supporting the release bearing and a member that is inoperative with respect to the release bearing or the bearing hub. Is provided with a pin urged in one direction by a coil spring, and the other non-operating member side is provided with two slopes on which the pin is pressed by the force of the coil spring. At the boundary of the above, a peak projecting toward the pin is a switching point of the turnover mechanism.

[Action]

According to the first aspect of the present invention, since the turnover mechanism is provided using a relatively large space at the outer peripheral portion of the release bearing which is a dead space in the clutch housing, the turn acting on the release bearing is provided. The set load of the over mechanism can be increased, and a large assist force can be secured on the clutch pedal side.

In the invention described in the above 2, the set load of the turnover mechanism is changed by changing the spring constant of the coil spring biasing the pin of the turnover mechanism or the angle of the two slopes against which the pin is pressed. The degree of freedom is increased, and fine adjustment of the assist force becomes possible.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, the clutch release device of the present invention is applied to a diaphragm spring type friction clutch.

First Embodiment FIG. 1 is a sectional view showing a part of a clutch release device. In FIG. 1, a pressure plate 14 and a diaphragm spring 16 are incorporated inside the clutch cover 10. The outer periphery of the pressure plate 14 is connected to the clutch cover 10 at a plurality of locations by straps (not shown) made of a leaf spring material.
Therefore, the pressure plate 14 can be displaced in the left-right direction in FIG. 1 by the elasticity of the strap.

On the other hand, the diaphragm spring 16 has a plurality of tongue-shaped holding pieces 12 formed along the inner circumference of the clutch cover 10.
, And are supported together with the pair of pivot rings 18. Further, the outer peripheral portion of the diaphragm spring 16 and the pressure plate 14 are stopped by a retracting spring (not shown) so as not to be separated from each other.

The pivot ring 18 is a diaphragm spring.
The diaphragm spring 16 is rotatable about both pivot rings 18 as fulcrums.

The clutch cover 10 is provided with a bolt on an end face of a flywheel 20 which rotates by driving an engine (not shown).
Fixed at 21. In this state, the elastic force of the diaphragm spring 16 acting on the pressure plate 14,
The set load (mounting load) on the clutch cover 10 side.

A facing 23 of the clutch disc 22 is located between the flywheel 20 and the pressure plate 14. The hub 24 of the clutch disk 22 is supported by an input shaft 26 of the gear transmission by a spline so that torque can be transmitted.

The facing 23 of the clutch disk 22 when the clutch is connected as shown in FIG. 1 is strongly sandwiched between the flywheel 20 and the pressure plate 14 by the set load on the clutch cover 10 side. In this clutch connected state, torque can be transmitted between the flywheel 20 and the input shaft 26 of the transmission.

The outsides of the flywheel 20 and the clutch cover 10 are covered with a clutch housing 30 as is well known. In the clutch housing 30, a cylindrical portion 32 of a bearing retainer fixed to the front wall of a transmission case (not shown) is arranged on the outer periphery of the input shaft 26 of the transmission and coaxially therewith. A bearing hub 36 having a release bearing 34 is mounted on the outer periphery of the cylindrical portion 32 so as to be slidable in the left-right direction in FIG.

Fork engaging portions 38 are integrally formed on the outer peripheral portion of the bearing hub 36, for example, at two places in the circumferential direction thereof (however, only one engaging portion is shown in the drawing). The tip of a clutch release fork 40 is connected to these fork engaging portions 38 by clips 42.

Therefore, during a clutch release operation in which a pedaling force is applied to a clutch pedal (not shown), the release fork 40
, The bearing hub 36 is slid to the clutch cover 10 side together with the release bear ring 34.
As a result, the distal end of the lever of the diaphragm spring 16 (the lower portion in FIG. 1) is pushed by the release bearing 34 to the left in the drawing. As a result, the diaphragm spring 16 rotates together with the pressure plate 14 with the pivot ring 18 as a fulcrum, and the clutch disc 22
The pressing load on the facing 23 is released. Accordingly, torque transmission between the flywheel 20 and the input shaft 26 of the transmission is cut off. When the pedaling force is released, the release bearing 34 and the bearing hub 36 are pushed back to their original positions by the elastic force of the diaphragm spring 16.

Next, a description will be given of a turnover mechanism 50 formed between the bearing hub 36 and the clutch housing 30, which is a member that is inoperative with respect to these. First
As is clear from FIG. 2 in which a part of the drawing is shown in an enlarged cross section, the fork engaging portion 38 of the bearing hub 36 includes:
A cylindrical support case 52 is fixed facing upward in the drawing. Inside the support case 52, a pin 54 with a flange is incorporated so that its tip is protruded outside, and is movable in the vertical direction in the drawing. Further, a coil spring 56 biased so as to push the pins 54 out of the support case 52 is incorporated in the support case 52.

On the other hand, a cam member 60 is attached to the inner wall of the clutch housing 30 by a support bolt 58. The cam member 60 has a pin 54 at a portion facing the pin 54.
The slopes 61 and 62 are formed on the right side of the drawing and the opposite side (toward the clutch cover 10) of the drawing with respect to the peak 63 that projects most to the side. When the release bearing 34 is at the position shown (clutch connection position), the pin 54 is pressed against the slope 61 on the right side of the drawing by the force of a spring 56. At this time, the pin 54, that is, the bearing hub 36
Receives a rightward force in FIG.

During the clutch release operation with the pedaling force applied, the pin 54 is located on the opposite slope 62 from the slope 61 over the peak 63. The bearing hub 36 at this time is the second
It receives a leftward force in the figure.

As shown in FIG. 2, the inclination angle of the slope 61 is set to θ1, the inclination angle of the slope 62 is set to θ2, and a pin 54 is attached to each of the slopes 61, 62 based on the elastic force of the spring 56.
When the pressing load of each is F, the pin 54
The rightward force F1 acting on the bearing hub 36 when in contact with 61 becomes F1 = F cos θ1 · sin θ1.

The leftward force F2 acting on the bearing hub 36 when the pin 54 is in contact with the slope 62 is F2 = F cos θ2 · sin θ2.

The angle and the curved shape of the peak 63 are set so that the leftward force F2 acting on the bearing hub 36 is significantly smaller than the set load of the clutch cover 10. Further, the range (length) 1 of the peak 63 in the left-right direction in FIG. 2 is set to be significantly smaller than the slide stroke of the release bearing 34.

The position of the cam member 60 can be adjusted in the direction along the axis of the support bolt 58, that is, in the sliding direction of the release bearing 34, and the support bolt 58
It is positioned by a nut 59 screwed into.

In the clutch release device having the above-described configuration, at the time of the clutch release operation in which the pedal depression force is applied, the bearing hub 36 is slid together with the release bearing 34 toward the clutch cover 10 as described above.
Along with this, the pin 54 of the turnover mechanism 50 is located on the opposite slope 62 from the slope 61 of the cam member 60 over the peak 63 which is the switching point. Turnover mechanism 50 in this state
Functions to slide the bearing hub 36 toward the clutch cover 10 by the above-described leftward force F2 in the drawing. This force F2 becomes the assist force on the clutch pedal through the clutch release system, and the pedal depression force is reduced.

When the pedaling force is released, the release bearing 34 is pushed back together with the bearing hub 36 in the original direction by the elastic force of the diaphragm spring 16 (set load on the clutch cover side). This allows the turnover mechanism
The fifty pins 54 are located on the original slope 61 as shown in FIG. The turnover mechanism 50 in this state functions to separate the bearing hub 36 from the clutch cover 10 by the above-described rightward force F1 in the drawing. As a result, even when the clutch release device is of the non-adjustable type, the release bearing 34 is pulled away from the lever end of the diaphragm spring 16 when the clutch is connected, causing vibration or abnormal noise due to the uneven rotation surface of the lever end, or Tip wear is reduced.

Second Embodiment A different embodiment of the turnover mechanism 50 is shown in FIG. In this embodiment, a fixing member 70 is attached to the clutch housing 30 by the same means as the cam member 60 of the first embodiment. And this fixing member 70
And a fork engaging portion 38 of the bearing hub 36, a disc spring 72 is provided. The disc spring 72 is elastically deformed in accordance with the sliding of the bearing hub 36, so that the function as the turnover mechanism 50 is obtained similarly to the first embodiment.

Third Embodiment FIG. 5 shows an embodiment of the turnover mechanism 50 which does not require the cam member 60 of the first embodiment or the fixing member 70 of the second embodiment. That is, in the third embodiment, the pin 80 and the spring 82 are incorporated in a radial hole formed in the bearing hub 36. The pin 80 is pressed against the outer peripheral surface of the cylindrical portion 32 of the bearing retainer by a spring 82.

On the other hand, on the outer peripheral surface of the cylindrical portion 32 of the bearing retainer, a peak portion 86 is formed at a position corresponding to the switching point of the turnover mechanism 50 in the sliding direction (left-right direction in the drawing) of the bearing hub 36, and is formed by the boundary. 84,8 slopes on both sides
5 are formed. Thus, the function of the turnover mechanism 50 can be obtained with a relatively simple configuration.

In the second and third embodiments, members that are considered to have the same or equivalent structure as those of the first embodiment are denoted by the same reference numerals in the drawings, and redundant description is omitted.

[Effect of the invention]

According to the present invention, the set load of the turnover mechanism can be set large without being restricted by the installation space or the like, or by increasing the degree of freedom of the set load, a large assist force can be secured or the assist force can be secured on the clutch pedal side. Subtle adjustments are possible.

[Brief description of the drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional view showing a part of a release device in a diaphragm spring type clutch, and FIG. 2 is an enlarged view of a part of FIG. FIG. 3 is a characteristic diagram showing a change in pedal effort by the turnover mechanism. FIGS. 4 and 5 are cross-sectional views showing the turnover mechanisms of the second and third embodiments, respectively. 10 Clutch cover 30 Clutch housing 34 Release bearing 36 Bearing hub 50 Turnover mechanism

Claims (2)

(57) [Scope of request for utility model registration] When the pedaling force is applied, the release bearing located in the clutch housing is slid toward the clutch cover to disconnect the clutch, and when the pedaling force is released, the release bearing is released. In a clutch release device in which a bearing is pushed back by a set load on a clutch cover side and a clutch is connected, a turnover mechanism having a switching point with respect to a sliding direction of the release bearing in a space around the release bearing in the clutch housing. The turnover mechanism has a force that slides the release bearing toward the clutch cover on one side of the switching point, and a force that slides the release bearing away from the clutch cover on the opposite side. A clutch release device characterized in that the clutch release device is set so as to exert each of the forces to be applied. 2. The clutch release device according to claim 1, wherein the turnover mechanism is disposed between the release bearing or a bearing hub that supports the release bearing and a member that is inoperative with respect to the release bearing. On the bearing or bearing hub side, there is provided a pin biased in one direction by a coil spring, and on the other inactive member side, there are provided two slopes on which the pin is pressed by the force of the coil spring. ,
A clutch release device wherein a peak projecting toward the pin at the boundary between these slopes is a switching point of the turnover mechanism.