JP2019178724A - Clutch release device - Google Patents

Abstract

To adjust the responsiveness of clutch fastening and the release of the fastening with respect to a pedal operation while preventing the generation of noise caused by the leakage of a lubricant while reducing a cost.SOLUTION: This clutch release device comprises a release lever having a power point part which is pressed according to an operation of a clutch pedal, a pivot part being a turning center at pressurization to the power point part, and an action point part which turns around the pivot part at the pressurization to the power point part, and releases the fastening of a drive source and a clutch plate by a turn; a lever support member in which a slide-movement face for supporting the release lever so as to be turnable at the pivot part is formed; and a cover member for covering the slide-movement face. The cover member has a root part attached to the lever support member, and a skirt part connected to the root part, and abutting on the release lever at a tip side. In the skirt part, resistance forces with respect to a turn of the release lever differ from each other at the fastening of the drive source and the clutch plate, and at the release of the fastening.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technical field of a clutch release device for engaging / disengaging a drive source and a clutch plate.

For example, as disclosed in Patent Documents 1 and 2 below, a clutch release device for engaging / disengaging a drive source and a clutch plate is known.
The clutch release device includes a release lever and a lever support member that rotatably supports the release lever. The release lever is pressed in response to the operation of the clutch pedal, a fulcrum part serving as a center of rotation when the force point part is pressed, and rotated around the fulcrum part when the force point part is pressed. And an action point portion for releasing the engagement between the drive source and the clutch plate. The lever support member has, for example, a substantially hemispherical tip, and supports the fulcrum of the release lever at the tip. Specifically, a sliding surface for rotatably supporting the release lever at the fulcrum portion is formed at the distal end portion.

JP 2013-194791 A JP 2013-242029 A

  In the clutch release device, a lubricant such as grease is applied between the release lever and the lever support member, particularly on the sliding surface described above, and friction and sliding noise when the release lever is rotated according to the clutch pedal operation. Suppression is achieved. However, the lubricant may be extruded along with the wear powder by rotating and sliding, or it may be melted by increasing the ambient temperature, and the sliding surface becomes insufficient with time, causing abnormal noise. There is a risk of becoming. Depending on how the vehicle is used, there may be cases where abnormal noise does not occur due to reapplying lubricant during maintenance such as clutch replacement, but there may also be cases where abnormal noise occurs before that. .

Further, since the clutch release device transmits the power corresponding to the clutch pedal operation to the clutch mechanism side, the power transmission characteristic determines the response of clutch engagement / disengagement with respect to the pedal operation.
Responsiveness of clutch engagement / disengagement with respect to pedal operation is an element that affects a driver's pedal operation feeling and driving feeling. For example, when there is a tendency for the clutch to be suddenly engaged in response to pedal operation, the driving feeling is deteriorated due to the vibration in the pitch direction of the vehicle, or the torque transmission downstream component is damaged due to an instantaneous torque increase. There is a risk of inviting.
In order to improve pedal operation feeling and driving feeling, it is required to appropriately adjust the response of clutch engagement / disengagement to pedal operation, but new parts have been added to enable this adjustment. For example, it is not desirable to promote cost increase.

  The present invention has been made in view of the above circumstances, and realizes adjustment of responsiveness of clutch engagement / disengagement with respect to pedal operation while reducing cost while preventing occurrence of abnormal noise due to lubricant leakage. With the goal.

  The clutch release device according to the present invention includes a force point portion that is pressed in response to an operation of a clutch pedal, a fulcrum portion that is a rotation center when the force point portion is pressed, and around the fulcrum portion when the force point portion is pressed. And a release lever having an action point portion for releasing the fastening of the drive source and the clutch plate by the rotation, and a sliding surface for rotatably supporting the release lever at the fulcrum portion. And a cover member that covers the sliding surface, the cover member being connected to the lever support member and connected to the root portion so that the tip end abuts the release lever. The skirt has a resistance against rotation of the release lever depending on whether the drive source and the clutch plate are engaged or not.

  The cover member prevents the lubricant applied to the sliding surface from leaking, and the resistance of the hem allows adjustment of the response of clutch engagement / disengagement to clutch pedal operation. It becomes.

  In the above-described clutch release device according to the present invention, the skirt can be configured such that the resistance force at the time of engagement is greater than the resistance force at the time of release of the engagement.

  As a result, when the clutch pedal is suddenly released for the purpose of sudden start or the like, it becomes difficult for the release lever to return, and sudden engagement of the clutch is prevented.

  In the clutch release device according to the present invention described above, the skirt portion includes a resistance portion at the time of engagement in which a pressure received from the release lever is larger at the time of engagement than at the time of release of the engagement, and at the time of release of the engagement than at the time of engagement. It is possible to have a configuration in which a release-time resistance portion in which the pressure received from the release lever is increased, and the fastening-time resistance portion is thicker than the release-time resistance portion.

  As a result, it is possible to prevent the deterioration of the driving feeling and the damage to the torque transmission downstream parts by relaxing the sudden engagement of the clutch by partially adjusting the thickness of the cover member.

  In the clutch release device according to the present invention described above, the skirt portion includes a resistance portion at the time of engagement in which pressure received from the release lever at the time of engagement is greater than that at the time of engagement release, and at the time of release of the engagement than at the time of engagement. A release resistance portion that increases the pressure received from the release lever, and the fastening resistance portion has a hem length that is a length from the base side to the tip side than the hem length of the release resistance portion. Also, a long configuration can be used.

  By adjusting the resistance according to the hem length, it is possible to reduce the amount of material used for the release resistance portion that shortens the length.

  In the clutch release device according to the present invention described above, the skirt portion includes a resistance portion at the time of engagement in which a pressure received from the release lever is larger at the time of engagement than at the time of release of the engagement, and at the time of release of the engagement than at the time of engagement. It is possible to provide a configuration in which a release-time resistance portion in which the pressure received from the release lever is increased and a shape memory material is provided in the fastening-time resistance portion.

  When the cover member is made of an elastic member such as rubber, the rigidity of the resistance portion at the time of engagement tends to increase at low temperatures, the resistance to clutch engagement increases, and the clutch may not be easily engaged excessively. Therefore, the shape memory material is provided in the fastening resistance portion as described above so that the fastening resistance portion is easily deformed at a low temperature.

  ADVANTAGE OF THE INVENTION According to this invention, the adjustment of the responsiveness of the clutch fastening with respect to pedal operation and fastening release can be implement | achieved, aiming at cost reduction, aiming at prevention of the noise generation by the leakage of a lubricant.

It is the figure which illustrated the outline of composition of the clutch mechanism (at the time of clutch fastening) provided with the clutch release device as an embodiment. It is the figure which illustrated the outline of composition of the clutch mechanism (at the time of clutch engagement release) provided with the clutch release device as an embodiment. It is the figure which showed the structural example of the cover member with which the clutch release apparatus as embodiment is provided. It is explanatory drawing about the clip member with which the clutch release apparatus as embodiment is provided. It is a figure for demonstrating the structure and effect | action of the skirt part of the cover member with which the clutch release apparatus as embodiment is provided. It is the figure which showed the structural example of the cover member with which the clutch release apparatus as a 1st modification is provided. It is a figure for demonstrating the structure and effect | action of the bottom part of the cover member with which the clutch release apparatus as a 1st modification is provided. It is a figure for demonstrating the structure and effect | action of the bottom part of the cover member with which the clutch release apparatus as a 2nd modification is provided.

<1. Overview of clutch mechanism configuration>
Hereinafter, a clutch release device 1 as an embodiment according to the present invention will be described with reference to the accompanying drawings.
FIGS. 1 and 2 are diagrams illustrating an outline of the configuration of the clutch mechanism 50 including the clutch release device 1. FIG. 1 shows a state when the clutch is engaged and FIG. 2 shows a state when the clutch is released.
The clutch mechanism 50 of this example is provided in a vehicle having an engine as a drive source for wheels, and is disposed between the engine and a transmission (transmission) to intermittently transmit power generated by the engine to the transmission. Configured as a possible mechanism.

  The clutch mechanism 50 includes a clutch disc 51, a diaphragm spring 52, a pressure plate 53, a clutch cover 54, and a release bearing 55 as components of the clutch body that interrupts power.

  The clutch cover 54, the pressure plate 53, and the diaphragm spring 52 are fixed to the flywheel 60 and rotate together with the crankshaft 61 of the engine. The clutch cover 54 is provided so as to cover the clutch disk 51, the diaphragm spring 52 and the pressure plate 53. An opening is formed in the clutch cover 54 so that the center of the diaphragm spring 52 is exposed.

  The clutch disk 51 has a substantially disc shape, and is splined to the input shaft 70 of the transmission at the center thereof. The clutch disc 51 has a clutch facing 56 sandwiched between the pressure plate 53 and the flywheel 60.

  The clutch facing 56 is desirably formed of a material that maintains a predetermined coefficient of friction, is excellent in wear resistance and heat resistance, and that suppresses changes in the coefficient of friction with respect to temperature changes that accompany clutch engagement. Specifically, as the clutch facing 56, for example, a resin mold made of a glass fiber as a base and subjected to resin processing, or a metal mold made of semimetal or ceramic is used in order to improve thermal conductivity and strength. You can also.

  The clutch disc 51 transmits the rotation of the flywheel 60 to the transmission via the input shaft 70 by the frictional force between the clutch facing 56 and the flywheel 60.

  The diaphragm spring 52 is provided on the opposite side of the clutch facing 56 with respect to the pressure plate 53. The peripheral edge portion of the diaphragm spring 52 is connected to the pressure plate 53, and the central portion of the diaphragm spring 52 is connected to the release bearing 55. The diaphragm spring 52 is provided as a clutch spring for pressing the clutch facing 56 toward the flywheel 60 via the pressure plate 53.

  In this example, the structure using the diaphragm spring 52 as the clutch spring has been described. However, another spring such as a coil spring may be employed as the clutch spring.

The pressure plate 53 has a substantially disk shape and is provided between the clutch facing 56 and the diaphragm spring 52.
When the clutch is engaged, the pressure plate 53 presses the clutch facing 56 toward the flywheel 60 with a substantially uniform force by the elastic force of the diaphragm spring 52. As a result, a frictional force is generated between the clutch facing 56 and the flywheel 60, and the rotation of the flywheel 60 is transmitted to the clutch disc 51.

  When the clutch is released, the release bearing 55 pushes the central portion of the diaphragm spring 52 as will be described later, so that the peripheral portion of the diaphragm spring 52 is displaced in a direction away from the flywheel 60. At this time, the pressure plate 53 is pulled in a direction away from the flywheel 60 together with the peripheral edge of the diaphragm spring 52. As a result, the frictional force between the clutch facing 56 and the flywheel 60 is eliminated, and the rotation of the flywheel 60 is not transmitted to the clutch disc 51.

The clutch mechanism 50 includes a release cylinder 57 and the clutch release device 1 as components of an operation mechanism for operating the clutch body from the driver's seat.
The clutch release device 1 includes a release lever 2, a lever support member 3, a cover member 4, and a clip member 5.

  The lever support member 3 is attached to a clutch housing 58 as a case body of the clutch mechanism 50. The release lever 2 is supported by the lever support member 3 so as to be rotatable in the release direction (direction indicated by the arrow L in FIG. 2) when the clutch is released.

Here, the release lever 2 rotates around the fulcrum part 22 when the force point 21 is pressed by the release cylinder 57, the fulcrum part 22 that is the center of rotation when the force point part 21 is pressed, and the force point part 21. And an action point portion 23 that is moved and rotates to press the release bearing 55 (that is, to release the clutch).
The lever support member 3 has a substantially hemispherical tip when the side supported by the clutch housing 58 is the base side and the side opposite to the base side is the tip side. A sliding surface 31 that supports the release lever 2 in a rotatable manner at the portion 22 is formed.

  The cover member 4 is made of, for example, an elastic material such as rubber, encloses a lubricant in the vicinity of the fulcrum portion 22 of the release lever 2, and foreign matter is present between the fulcrum portion 22 and the sliding surface 31 of the lever support member 3. It is provided as a seal member for preventing intrusion, and covers the sliding surface 31 from the base side of the lever support member 3.

FIG. 3 is a view showing a configuration example of the cover member 4, and FIGS. 3A and 3B are views of the cover member 4 of this example observed from different angles.
The cover member 4 includes a root portion 41 that is attached to a portion closer to the root side than the distal end portion of the lever support member 3, and a skirt portion 42 that is connected to the root portion 41 and has a distal end side that contacts the release lever 2. Yes.
The root portion 41 has a substantially cylindrical shape, and comes into contact with the lever support member 3 on the inner peripheral surface.
The skirt part 42 is formed in a divergent shape from the base part 41 toward the tip side (toward the fulcrum part 22 side of the release lever 2), and has a substantially truncated cone shape.
In this example, the tip side of the skirt portion 42 is formed over one round, but the base side is not formed over one round and has a shape cut off by two openings. The portions other than the two openings, that is, the two portions responsible for the connection between the root portion 41 and the skirt portion 42 are a first connection portion 42a and a second connection portion 42b, respectively. The first connecting portion 42 a and the second connecting portion 42 b are positioned facing the central axis of the cover member 4.

In FIG. 1 and FIG. 2, the clip member 5 is provided as a clamping member for preventing the release lever 2 supported by the lever support member 3 at the fulcrum portion 22 from falling off the lever support member 3.
As shown in FIG. 4, the clip member 5 has one end portion 51 in the longitudinal direction inserted through an insertion hole formed in the release lever 2, and the holding portion 51 formed on the other end side from the one end portion 51 is a lever. The support member 3 is sandwiched. The clip member 5 restricts the movement of the release lever 2, specifically, the movement of the input shaft 70 in the axial direction when the release lever 2 rotates, thereby preventing the release lever 2 from falling off the lever support member 3. Is planned.

  An input shaft 70 is inserted on the inner peripheral side of the retainer portion 59 extending from the clutch housing 58 (FIGS. 1 and 2). The release bearing 55 is positioned between the retainer portion 59 and the diaphragm spring 52 in the axial direction of the input shaft 70, the input shaft 70 is inserted on the inner peripheral side, and the axial direction of the input shaft 70 with respect to the retainer portion 59. It is provided to be movable.

When the driver depresses the clutch pedal, the release cylinder 57 operates. That is, the release cylinder 57 presses the power point portion 21 of the release lever 2. By this pressing, the release lever 2 rotates about the lever support member 3 as a fulcrum (transition from FIG. 1 to FIG. 2). As the release lever 2 rotates, the action point 23 of the release lever 2 presses the release bearing 55, and the release bearing 55 slides in a direction close to the flywheel 60. As a result, a state in which the release bearing 55 presses the center portion of the diaphragm spring 52 is obtained, and a state in which the clutch is released is obtained.
On the other hand, when the clutch pedal is released, the release lever 2 rotates in the direction opposite to that when the clutch is released, and the release bearing 55 slides in a direction away from the flywheel 60. As a result, the state in which the release bearing 55 presses the central portion of the diaphragm spring 52 is eliminated, and a state in which the clutch is engaged is obtained.

  In this example, the hydraulic clutch that presses the force point portion 21 of the release lever 2 by the release cylinder 57 is illustrated, but the method of pressing the force point portion 21 is not particularly limited.

<2. Cover member of embodiment>
FIG. 5 is a view for explaining the configuration and operation of the skirt portion 42 of the cover member 4. FIGS. 5A and 5B show cut models of the clutch release device 1 when the clutch is engaged and when the clutch is released. ing. In FIGS. 5A and 5B, the clutch housing 58 is also shown.

  First, for the sake of explanation, the direction of the release lever 2 is defined as follows. That is, the side on which the force application point 21 is located with respect to the rotation axis of the release lever 2 is defined as the upper side, and the side on which the action point 23 is located is defined as the lower side.

  In the cover member 4 of the present example, the first connecting portion 42a and the second connecting portion 42b are formed in the skirt portion 42. However, as shown in the figure, the cover member 4 has the first connecting portion 42a on the upper side, The two connecting portions 42b are attached to the lever support member 3 so as to be positioned on the lower side.

Here, the upper portion of the skirt portion 42, that is, the portion extending through the first connecting portion 42a to the tip of the skirt portion 42, as seen by comparing FIGS. 5A and 5B, is more clutched than when the clutch is engaged (FIG. 5A). At the time of releasing the engagement (FIG. 5B), the pressure received from the rotating release lever 2 becomes a portion (hereinafter, referred to as “resisting portion at the time of release”).
On the other hand, the lower part of the skirt part 42, that is, the part extending through the second connecting part 42b to the tip of the skirt part 42 rotates more when the clutch is engaged (FIG. 5A) than when the clutch is released (FIG. 5B). This is a portion where the pressure received from the release lever 2 is increased (hereinafter referred to as a “resisting portion at the time of fastening”).

  In the cover member 4 of this example, the fastening resistance portion as the lower portion is formed thicker than the releasing resistance portion as the upper portion. That is, the cover member 4 has a greater resistance force at the time of engagement than a resistance force at the time of releasing the clutch engagement as a resistance force against the rotating release lever 2.

In the cover member 4, the upper part and the lower part are parts for applying a resistance force to the rotating release lever 2. Therefore, for example, by adjusting the thickness thereof as described above, the clutch pedal can be adjusted. Response of clutch engagement / disengagement to the operation can be adjusted.
In particular, by increasing the engagement resistance portion as described above, it is possible to increase the resistance to the release lever 2 when the clutch is engaged. As a result, for example, when the driver suddenly releases the clutch pedal for a sudden start or the like, the release lever 2 can be made difficult to return in response to the pedal operation, and sudden engagement of the clutch is prevented. Is done.
Accordingly, the life of the clutch can be extended.

  In the above example, two openings are formed in the skirt portion 42, and the resistance portion at the time of fastening and the resistance portion at the time of release are cut off. However, the opening to the skirt portion 42 is not essential. Alternatively, a configuration in which the fastening resistance portion and the release resistance portion are continuously formed can be employed.

<3. Modification>
FIG. 6 shows a configuration example of a cover member 4A provided in the clutch release device 1A as the first modified example.
The difference from the cover member 4 is that the first connecting portion 42 a is omitted from the skirt portion 42.

  FIG. 7 is a view for explaining the configuration and operation of the skirt portion 42A of the cover member 4A provided in the clutch release device 1A, and shows a cut model of the clutch release device 1A in the same manner as in FIG. .

By omitting the first connecting portion 42a, the bottom portion 42A of the cover member 4A has a short bottom length (a length from the root side to the tip side). That is, when the resistance part at the time of release as the upper part and the resistance part at the time of fastening as the lower part are compared, the skirt length of the resistance part at the time of fastening is made longer.
As a result, the resistance force to the rotating release lever 2 is greater at the fastening resistance portion than at the release resistance portion. Therefore, as in the case of the clutch release device 1, the life of the clutch can be extended.

FIG. 8 is a view for explaining the configuration and operation of the skirt portion 42B of the cover member 4B provided in the clutch release device 1B as the second modified example. The clutch release device 1B has the same form as that of FIG. A cut model is shown.
The difference between the cover member 4B and the cover member 4 is that the shape memory material 43 is provided in the fastening resistance portion as the lower portion. The shape memory material 43 is, for example, a shape memory alloy, and is disposed so as to be embedded in the lower portion of the skirt 42B. Specifically, in this example, the shape memory material 43 is provided in the skirt portion 42B from the inside of the second coupling portion 42b to the vicinity of the tip of the skirt portion 42B.
As the shape memory material 43, a material is selected that has a property of being easily deformed at a low temperature and easily returning to its original shape at a high temperature (higher than a low temperature: including normal temperature).

Here, when the cover member 4B is formed of an elastic member such as rubber, the rigidity of the resistance portion at the time of engagement tends to be increased at low temperatures, and the resistance force to the clutch is increased, and the clutch is difficult to be excessively engaged. There is a fear. Therefore, as described above, the shape memory material 43 is provided in the resistance portion at the time of fastening so that the resistance portion at the time of fastening is easily deformed at a low temperature (a resistance force to the release lever 2 is reduced).
Accordingly, it is possible to prolong the life of the clutch by preventing sudden engagement of the clutch while preventing the clutch from becoming difficult to be engaged excessively at low temperatures.

  In the above, the example using the shape memory material is applied to the case where the difference in the thickness of the skirt is given. However, in the case where the structure has a difference in the hem length as in the first modification, It can be suitably applied to. Or even if it is a case where there is no difference in thickness and hem length, it can be applied suitably.

  Here, as a method for providing a difference in the resistance force to the release lever 2 between the resistance portion at the time of fastening and the resistance portion at the time of release, there are various methods other than the method of providing a difference in the thickness and hem length of the hem portion described above. Conceivable. For example, by making a cut in the thickness direction of the hem portion to make the hem portion easier to bend, it is possible to make a difference in resistance regardless of the thickness and the hem length.

<4. Summary of Embodiment>
As described above, the clutch release device (1 or 1A or 1B) according to the embodiment includes a power point portion (21) that is pressed according to the operation of the clutch pedal, and a fulcrum that is the center of rotation when the force point portion is pressed. A release lever (2) having a portion (22) and an action point portion (23) that is rotated around a fulcrum when the force point is pressed and that releases the fastening of the drive source and the clutch plate by the rotation. And a lever support member (3) formed with a sliding surface (31) for rotatably supporting the release lever at the fulcrum portion, and a cover member (4 or 4A or 4B) covering the sliding surface. ing.
The cover member has a root portion (41) attached to the lever support member, and a skirt portion (42A or 42A or 42B) that is connected to the root portion and has a distal end abutting against the release lever. The resistance against the rotation of the release lever differs between when the source and the clutch plate are engaged and when the engagement is released.

The cover member prevents the lubricant applied to the sliding surface from leaking, and the resistance of the hem allows adjustment of the response of clutch engagement / disengagement to clutch pedal operation. It becomes.
When adjusting the response of clutch engagement / disengagement with respect to pedal operation, no additional parts other than the cover member are required, so that the cost can be reduced by reducing the number of parts.
As described above, according to the clutch release device of the embodiment, it is possible to realize the adjustment of the responsiveness of the clutch engagement / disengagement with respect to the pedal operation while reducing the cost while preventing the generation of the noise due to the leakage of the lubricant. it can.

  Moreover, in the clutch release device of the embodiment, the resistance at the time of fastening is made larger at the skirt than at the time of releasing the fastening.

As a result, when the clutch pedal is suddenly released for the purpose of sudden start or the like, it becomes difficult for the release lever to return, and sudden engagement of the clutch is prevented.
Accordingly, it is possible to prevent the deterioration of the driving feeling and the damage of the torque transmission downstream parts.

  Furthermore, in the clutch release device (1) of the embodiment, the skirt portion (42) includes a resistance portion at the time of engagement that receives a greater pressure from the release lever at the time of engagement than at the time of engagement release, and a release at the time of release of engagement than at the time of engagement. And a release-time resistance portion in which the pressure received from the lever increases, and the fastening-time resistance portion is thicker than the release-time resistance portion.

This makes it possible to extend the life by reducing the sudden engagement of the clutch by partially adjusting the thickness of the cover member. In other words, for example, rubber can be realized with a single material of rubber.
Therefore, it is possible to realize prevention of deterioration of driving feeling due to relaxation of sudden engagement of the clutch and prevention of damage to the torque transmission downstream parts with a simple configuration and at low cost.

  Furthermore, in the clutch release device (1A) of the embodiment, the skirt portion (42A) includes a resistance portion at the time of engagement that receives a greater pressure from the release lever at the time of engagement than at the time of engagement release, and a time when the engagement is released from the time of engagement. The release resistance part increases the pressure received from the release lever, and the fastening resistance part has a hem length that is the length from the root side to the tip side longer than the hem length of the resistance part at the time of release. ing.

By adjusting the resistance according to the hem length, it is possible to reduce the amount of material used for the release resistance portion that shortens the length.
Therefore, cost reduction can be achieved.

  In the clutch release device (1B) of the embodiment, the skirt portion (42B) includes a resistance portion at the time of engagement that receives pressure from the release lever at the time of engagement greater than at the time of engagement release, and a release at the time of release of engagement than at the time of engagement. And a release-time resistance portion in which the pressure received from the lever is increased, and the shape-memory material is provided in the resistance portion at the time of fastening.

When the cover member is made of an elastic member such as rubber, the rigidity of the resistance portion at the time of engagement tends to increase at low temperatures, the resistance to clutch engagement increases, and the clutch may not be easily engaged excessively. Therefore, the shape memory material is provided in the fastening resistance portion as described above so that the fastening resistance portion is easily deformed at a low temperature.
Accordingly, it is possible to prevent deterioration of the driving feeling and damage to the torque transmission downstream parts by preventing sudden engagement of the clutch while preventing the clutch from being excessively engaged at low temperatures.

1, 1A, 1B Clutch release device, 2 release lever, 21 force point part, 22 fulcrum part, 23 action point part, 3 lever support member, 31 sliding surface, 4, 4A, 4B cover member, 41 root part, 42, 42A, 42B hem, 42a first connecting part, 42b, second connecting part, 43 shape memory material, 50 clutch mechanism, 51 clutch disk, 52 diaphragm spring, 53 pressure plate, 54 clutch cover, 55 release bearing, 56 clutch Facing, 57 release cylinder, 58 clutch housing, 59 retainer, 60 flywheel, 61 crankshaft,
70 input shaft

Claims (5)

A force point portion that is pressed according to the operation of the clutch pedal, a fulcrum portion that becomes a rotation center when the force point portion is pressed, and a fulcrum portion that is rotated around the fulcrum portion when the force point portion is pressed. A release lever having an action point for releasing the engagement between the drive source and the clutch plate;
A lever support member formed with a sliding surface that rotatably supports the release lever at the fulcrum;
A cover member covering the sliding surface,
The cover member is
A root portion attached to the lever support member; and a hem portion connected to the root portion and having a tip end abutting against the release lever;
The skirt is
A clutch release device having different resistance to rotation of the release lever between when the drive source and the clutch plate are engaged and when the engagement is released. The skirt is
The clutch release device according to claim 1, wherein the resistance force at the time of engagement is greater than the resistance force at the time of release of the engagement. The skirt is
A fastening resistance portion in which the pressure received from the release lever at the time of fastening is greater than that at the time of fastening release; and a resistance portion at the time of release from which the pressure received from the release lever is greater than at the time of fastening. ,
The clutch release device according to claim 2, wherein the engaging resistance portion is thicker than the releasing resistance portion. The skirt is
A fastening resistance portion in which the pressure received from the release lever at the time of fastening is greater than that at the time of fastening release; and a resistance portion at the time of release from which the pressure received from the release lever is greater than at the time of fastening. ,
4. The clutch release device according to claim 2, wherein the fastening resistance portion has a hem length that is a length from the root side to the tip side longer than a hem length of the releasing resistance portion. 5. The skirt is
A fastening resistance portion in which the pressure received from the release lever at the time of fastening is greater than that at the time of fastening release; and a resistance portion at the time of release from which the pressure received from the release lever is greater than at the time of fastening. ,
The clutch release device according to any one of claims 2 to 4, wherein a shape memory material is provided on the resistance portion at the time of engagement.

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