JPS5853465Y2 - Cable type clutch release device for constant contact type clutch - Google Patents

Description

[Detailed description of the invention] This invention is a constant contact type clutch in which the diaphragm spring of the clutch and the release bearing are in constant contact, and the movement of the clutch pedal is transmitted to the release fork via a cable. The present invention relates to a type clutch release device.

For example, in a clutch provided between an engine and a transmission, the length of the inner cable is fixed, so when the clutch disc wears out, a problem arises in that the play of the clutch pedal changes.

For this reason, the present applicant has proposed a latch release device as shown in Utility Model Application Publication No. 156639/1983, in which the inch cable is held by a gripping member on the clutch pedal side when the clutch pedal moves by a predetermined amount of play. In this device, the end of the inner cable on the clutch pedal side is bent when the clutch pedal and the inch cable are connected, and a predetermined part of the inner cable is rubbed due to this bending, which is disadvantageous in terms of the durability of the inner cable. It is.

An object of the present invention is to provide a cable-type clutch release device for a constant-contact clutch that automatically adjusts the play of the clutch pedal to a constant level while effectively avoiding damage to the inner cable.

Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a flywheel 1 is fixed to a crankshaft 2 of an engine (not shown) and supported by an input shaft 3 of a transmission (not shown) via a pilot bearing 4 so as to be relatively rotatable.

The clutch cover 5 is fixed to the flywheel 1 with bolts 6, and a predetermined portion of a diaphragm spring 7 is supported by a pivot ring 8.

The pressure plate 11 is supported by the clutch cover 5 via a strap (not shown) at a predetermined location on its outer periphery, and is further joined to the outer periphery of the diaphragm spring 7 by a retracting spring 12 .

The clutch disc 13 is disposed between the flywheel 1 and the pressure plate 11 and is fixed to a hub 14, which is spline-fitted to the shaft 3.

A clutch release bearing 16 is provided on the outer periphery of the cylindrical portion of a bearing retainer 150 that is aligned with and protrudes from the shaft 3 and that comes into contact with the center portion of the diaphragm spring 7.
A clutch release bearing hub 17 is equipped to be slidable in the axial direction.

The release fork 18 is swingably supported around a shaft 190 at one end, coupled to the release hub 17 at the middle, and coupled to the inner cape 1L/20 at the other end.

Outer cape covering inner cable 20/I/25
is the bushing 2 attached to the clutch housing 26.
7 at one end.

The rod 28 is coupled to the other end of the inner cable 20 and passes through the pedal bracket 29.

The hollow guide 30 provided in the through hole of the pedal bracket 290 guides the rod 28 linearly.

The clutch pedal 33 is swingably supported by the body via a pedal boss 34, and is provided with a pedal pad 35 at its lower end.

, the return spring 36 urges the clutch pedal (v33) in the return direction.

A rail 39 is provided so that its extending direction substantially coincides with the extending direction of the other end portion of the inner cable 20, that is, the extending direction of the hollow guide 30, and the slider 40 slides on the rail 39.

A U-shaped groove 41 that opens downward is formed at the lower end of the slider 40, and a pin 42 provided at the upper end of the clutch pedal 33 is inserted into the groove 41.

The slider 40 has a tapered inner circumferential surface 43 with a conical side surface concave toward the pedal bracket 29 side.

The gripping member 47 is gripped from four pieces 49 obtained by dividing a truncated conical member 48 as a workpiece shown in FIG. 3 into four in the circumferential direction and appropriately cutting out predetermined portions.

At the center of the truncated conical portion 48, an inner circumferential surface 50 having an inner diameter slightly larger than the outer diameter of the rod 28 is formed.
A cutout portion 53 is provided in between.

The circumferential dimension of the cutout portion 530 increases toward the end face 52, thereby allowing the gripping member 4T to contract in the radial direction.

The outer peripheral surface 54 of the piece 49 is a side surface of the truncated conical member 48, that is, it is tapered.

The pieces 49 are arranged so as to surround the rod 28 from the outer periphery with the end face 52 on the small diameter side facing the pedal bracket 29.

A flange 57 as a spring seat is provided at the end of the rod 28, and the flange 57 and the end face 51 of the gripping member 470 on the large diameter side
A compression spring 58 provided between the grip member 49 and the slider 40 presses the grip member 49 toward the inner peripheral surface 43 of the slider 40 .

Inner peripheral portion 59 of the rod 28 and the gripping member 47 on the end surface 52 side
The predetermined portion 60 and the inner circumferential portion 59 of the rod 28 are formed with a number of score lines to improve engagement with the rod 28.

The stopper member 61 is mounted adjacent to the driver's cab side surface of the pedal bracket 29, passes through the rod 28 at the center, and has a stopper portion 62 that protrudes in the axial direction.

A groove 63 is provided in the end surface 52 of the piece 49.

As shown in an enlarged view in FIG. 6, in the longitudinal cross-sectional view of the piece 49, the radially outer side wall 64 of the groove 630 is
It is formed as a tapered surface that tapers toward 1.

When the clutch pedal 33 is depressed, the clutch pedal 3
3 rotates around the pedal boss 34, and the clutch pedal 3
The pin 42 at the upper end of 3 moves away from the pedal bracket 29 , so that the slider 40 is guided on the rail 39 in the direction away from the pedal bracket 29 , and the gripping member 47 is carried along by the slider 40 .

While the stopper portion 62 is in the groove 63 of the piece 49, the stopper portion 62 contacts the tapered side wall 64 of the groove 63 and prevents the gripping member 470 from contracting inward in the radial direction. Even though the gripping member 4
7 is prevented from engaging with the rod 28, thereby creating play in the clutch pedal 33.

When the amount of depression of the clutch pedal 33 reaches a predetermined amount of play, the tip of the stopper portion 62 comes off the groove 63 of the piece 54, and the end surface 52 side of the gripping member 47 can be contracted in the radial direction.

In this way, the end surface 52 side of the gripping member 47 is connected to the tapered inner circumferential surface 43 of the slider 40 and the compression spring 58 to the gripping member 4T.
contracting radially inwardly due to the force acting on it, the inner circumferential portion 59 engages the portion 60 of the rod 28 , the rod 28 is entrained by the gripping member 47 and the inner cable 20 is pulled towards the clutch pedal 33 .

As a result, the release bearing 16 pushes the center portion of the diaphragm spring 7 toward the flywheel 1, and the clutch becomes released.

Note that the movement of the rod 28 at this time becomes linear due to the slider 40 despite the rotational movement of the clutch pedal 330.

During the return movement of the clutch pedal 33, the engagement between the inner circumferential portion 59 of the gripping member 47 and the portion 60 of the rod 28 is maintained until the stopper portion 62 enters the groove 63 of the piece 49, and the clutch pedal With the return movement of 33, the inch cable 20 is pulled toward the clutch side.

When the gripping member 47 is returned to the position where the stopper portion 62 reaches the groove 63 of the gripping member 47, the tip of the stopper portion 62 enters the groove 63 while contacting the tapered side wall 64 of the groove 63, and the gripping member The end surface 52 side of the rod 47 is expanded in the radial direction, and the inner peripheral portion 59 is separated from the portion 60 of the rod 28.

The slider 40 moves until it comes into contact with the stopper member 610 surface.

In this way, at the final position of the return movement of the clutch pedal 33, the engagement between the gripping member 47 and the rod 28 is released, and the end of the inch cable 20 on the clutch pedal 33 side becomes free.
Since the release bearing 16 is located away from the flywheel/L/1 depending on the amount of wear of the clutch disc 13, the pressing force by the diaphragm spring 7 is maintained appropriately regardless of the wear of the clutch disc 13.

In addition, since the rod 28 is in a pulled position toward the clutch side in relation to the amount of wear on the clutch disc 13, the next time the clutch pedal 33 is depressed, the gripping member 47 is attached to the portion 60 of the rod 28. The engagement position of the inner peripheral portion 59 changes depending on the amount of wear on the clutch disc 13, and this has an effect equivalent to adjusting the length of the inch cable 20.
The play of the clutch pedal 33 is maintained constant regardless of the amount of wear of the clutch disc 13.

When the naori latch pedal 33 is in the released state, the compression spring '5
8 appropriately pulls the inner cable 20 toward the clutch pedal 33 to prevent the inner cape L/20 from slackening.

As described above, according to the present invention, when the clutch pedal 33 is released, the clutch pedal 33 and the inner cape/L/20
Since the engagement position of the gripping member 47 on the rod 28 changes depending on the amount of wear on the clutch disc 13, the play of the clutch pedal 33 remains constant regardless of the amount of wear on the clutch disc 13. maintained at a.

According to the invention, the gripping member 47 is linearly moved by the slider 40 to engage or disengage the rod 28.

The rod 28 therefore does not have to be bent or rubbed in parts, so damage is avoided;
Improved durability.

Rod 28 is rigid in the example embodiment, but may be made of a flexible material.

The piece 49 of the gripping member 47 is manufactured with a cutout portion 53 that increases toward the smaller diameter end face 52, so that the radial reduction of the gripping member 470 is smooth and the gripping member 47
The engagement between the inner circumferential portion 59 of the rod 28 and the rod 28 is ensured.

A groove 63 having a tapered side wall 64 is formed on the end surface 52 side of the gripping member 47, and the gripping member 47 is connected to the stopper portion 62.
When the gripping member 47 ? ) The end surface 52 side is opened radially outward, and the inner peripheral surface 59 of the gripping member 47 is
8, the release of the rod 28 by the gripping member 47 is ensured.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention when the clutch pedal is released, FIG. 2 is a diagram showing the embodiment of the present invention during the clutch pedal depression movement, and FIG. 3 is a perspective view of the gripping member. FIG. 4 is a view taken from direction {circle around (2)} in FIG. 3, FIG. 5 is a perspective view of one piece constituting the gripping member, and FIG. 6 is a longitudinal sectional view of the piece. 1... Flywheel, 7... Diaphragm spring, 11... Pressure plate, 13... Clutch disc, 16...
...Release bearing, 18...Release fork, 20...Inner cable, 33...
...Clutch pedal, 39...Rail, 40
......Slider, 43...Tapered inner circumference, 47...Gripping member, 54...Outer circumference, 58...Compression spring , 61...stopper member.

Claims (1)

[Scope of utility model registration request] The clutch disc located between the flywheel and the pressure plate, the diaphragm spring that presses the clutch disc against the flywheel via the pressure plate, the release bearing that is in constant contact with the diaphragm spring, and the axial position of the release bearing. In a constant contact clutch comprising a release fork to be operated and a cable connected to the release fork at one end and transmitting movement of the clutch pedal to the release fork, the clutch has a tapered inner peripheral surface and engages the end of the clutch pedal. A slider member that moves linearly in accordance with the swinging motion of the slider member, and a gripping member that has a tapered outer circumferential surface that contacts the tapered inner circumferential surface of the slider member and that is contractible in the radial direction and surrounds the other end portion of the inch cable. A cable-type clutch release device for a constant contact clutch, characterized in that it comprises a spring that presses the gripping member towards the slider member, and a stop that limits the return movement of the gripping member during the return movement of the clutch pedal.