JPH0544581Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a cone spring for preventing the load of the diaphragm spring from increasing more than necessary during use of the clutch in a pull type clutch cover assembly. This is related to those that have the following.

(Prior Art) FIG. 11 is a partial schematic vertical cross-sectional view showing a conventionally known pull type clutch cover assembly. A friction facing 2 is provided on the outer periphery of a clutch disk (not shown), and the facing 2 is pressed against the flywheel 1 by a pressure plate 3. The outer periphery and back surface of the pressure plate 3 are covered with a clutch cover 4. The outer periphery of the clutch cover 4 is fixed to the flywheel 1 with bolts (not shown). Further, the pressure plate 3 is connected to the inner surface of the clutch cover 4 by a strap plate (not shown) extending in the circumferential direction at its outer periphery, and the pressure plate 3 cannot rotate with respect to the clutch cover 4. Moreover, it is supported so as to be freely movable in the axial direction.

A disc-shaped diaphragm spring 5 is arranged between the clutch cover 4 and the pressure plate 3. The diaphragm spring 5 has an outer supporting point C1 supported by the corner 4a of the clutch cover 4, an intermediate supporting point C2 abutting against the fulcrum land 3a of the pressure plate 3, and an inner supporting point C3 supported by the release bearing 6. Supported.

Then, by pressing the facing 2 against the flywheel 1 by the pressure plate 3 pressed by the diaphragm spring 5, the clutch is connected and the release bearing 6 is moved axially rearward on the opposite side from the pressure plate 3. By moving the diaphragm spring 5, the inner peripheral part of the diaphragm spring 5 moves rearward in the axial direction using the outer fulcrum C1 as a fulcrum, and the pressure plate 3 moves rearward by the elastic force of the strap plate, so that the clutch is disconnected. ing.

By the way, the diaphragm spring 5 is generally
It has a characteristic that the load changes as shown by the solid line A in FIG. 5 with respect to the amount of deflection. Normally, the amount of deflection in the clutch engaged state at the initial stage of use is set to the value at point B, but if the facing 2 wears out due to long-term use and as a result, the amount of deflection of the diaphragm spring 5 in the clutch engaged state decreases. The load gradually increases and reaches point C, and as the facing 2 wears further, the load gradually decreases and the amount of deflection reaches the wear limit point D. In this way, during use of the clutch, especially in the vicinity of point C, the load (pressing force) on the diaphragm spring 5 increases more than necessary, causing the flywheel on the drive side to
There was a risk that excessive torque would be transmitted between the clutch disk (not shown) on the driven side and the required depression force of the clutch pedal would increase.

(Purpose of the invention) The object of the present invention is to prevent the load of a diaphragm spring from increasing more than necessary in a pull-type clutch during use of the clutch.

(Structure of the invention) The first invention of the present application includes a diaphragm spring having an enlarged opening at the radially outer end of a radial slit, an outer fulcrum part of the diaphragm spring is supported by a clutch cover, and an intermediate fulcrum part is supported by a clutch cover. In a pull-type clutch that contacts the fulcrum land of the pressure plate, the inner fulcrum part is supported by the release bearing, and the clutch is shut off by moving the release bearing axially rearward on the opposite side from the pressure plate. , grooves are provided at multiple locations spaced apart in the circumferential direction of the Fulcrum land, a disc-shaped cone spring is placed between the pressure plate and the diaphragm spring, and the radius provided on the outer periphery of the cone spring is A second protruding piece provided at the tip of the first protruding piece facing outward in the direction
The protruding piece is inserted into the groove, the tip of the first protruding piece is brought into contact with the fulcrum land from the diaphragm spring side, and the tip of the first protruding piece is brought into contact with the diaphragm spring side provided on the side edge of the first protruding piece on the clutch rotation direction side. A third protruding piece having a protruding tip bent in the clutch rotation direction is passed through the enlarged opening with a gap in the clutch rotation direction, and the inner peripheral edge of the cone spring is provided in contact with the diaphragm spring. This is a pull type clutch cover assembly featuring the following.

The second idea is to support the outer fulcrum part of the diaphragm spring by a clutch cover, the intermediate fulcrum part to contact the fulcrum land of the pressure plate, and the inner fulcrum part to be supported by a release bearing. In a pull-type clutch that disconnects the clutch by moving the clutch axially rearward on the opposite side of the pressure plate, a disc-shaped cone spring is arranged between the diaphragm spring and the clutch cover, and the outer periphery of the cone spring is A pull-type clutch characterized in that the diaphragm spring abuts against the inner surface of the clutch cover from the side opposite to the pressure plate, and the inner peripheral edge moves integrally with the diaphragm spring toward the pressure plate in the axial direction. This is a cover assembly.

(Function) In the first invention of the present application, when the inner periphery of the diaphragm spring moves toward the pressure plate in the clutch connected state, the inner periphery of the cone spring also moves toward the pressure plate, causing the cone spring to move toward the pressure plate. is compressed in the axial direction using the tip of the first protruding piece that is in contact with the Fulcrum land as a fulcrum. Therefore, the inner peripheral portion of the diaphragm spring is biased by the cone spring in a direction opposite to the pressure plate. Further, since the second projecting piece is fitted into the groove provided in the fulcrum land, the cone spring does not rotate relative to the pressure plate even when the clutch is in the disengaged state. Furthermore, since the third protruding piece is passed through the enlarged opening with a gap in the direction of clutch rotation, when the cone spring rotates together with the diaphragm spring, etc., the third protruding piece passes along the third protruding piece to the rear side of the diaphragm spring. Air flows through the enlarged opening, and this air flow cools the pressure plate and facings.

In addition, in the second invention, when the inner circumference of the diaphragm spring moves toward the pressure plate in the clutch connected state, the inner circumference of the cone spring moves integrally with the diaphragm spring toward the pressure plate in the axial direction. The cone spring is compressed in the axial direction using the outer circumferential edge which abuts against the inner surface of the clutch cover from the side opposite to the diaphragm spring pressure plate as a fulcrum. Therefore, the inner peripheral portion of the diaphragm spring is biased by the cone spring in a direction opposite to the pressure plate.

(Embodiment) FIG. 1 is a partial vertical sectional view showing a pull type clutch cover assembly according to the first invention of the present application. Portions corresponding to those in FIG. 11 are given the same reference numerals. As shown in FIG. 2, the fulcrum land 3a has a stepped portion 31 formed on the inner side in the radial direction, and the protruding height of the fulcrum land 3a is formed at multiple locations spaced apart in the circumferential direction. Grooves 32 having substantially the same depth are formed from the diaphragm spring 5 side. The groove portion 32 is formed so as to traverse the fulcrum land 3a in the radial direction.

The diaphragm spring 5 has radial slits 5a as shown in FIG.
An enlarged opening 5b is formed at the outer end in the radial direction of a.

A cone spring 8 is arranged between the diaphragm spring 5 and the pressure plate 3. As shown in FIGS. 3 and 4, a plurality of circumferentially spaced locations on the outer periphery of the cone spring 8, here the same number as the enlarged openings 5b of the diaphragm spring 5, are provided with radially outward A first protruding piece 8a is formed in the direction, and a first protruding piece 8a is formed in the direction.
A second protruding piece 8b extending outward in the radial direction is formed at a part of the tip of a. The circumferential width of the protruding piece 8b is the same as the circumferential width of the groove 32 of the Fulcrum land 3a. Further, on the side edge of the protruding piece 8a on the side of the clutch rotation direction (direction of arrow A in FIG. 3), there is provided a third portion that protrudes toward the diaphragm spring 5 side and whose tip is bent toward the clutch rotation direction.
A protruding piece 8c is formed.

In the cone spring 8, the protruding piece 8b is fitted into the groove 32 of the Fulcrum land 3a, and the tip of the protruding piece 8a is brought into contact with the stepped part 31 of the Fulcrum land 3a from the diaphragm spring 5 side, so that the cone spring 8 protrudes. The piece 8c is passed through the enlarged opening 5b of the diaphragm spring 5, and the inner peripheral edge is provided so as to come into contact with the diaphragm spring 5 from the pressure plate 3 side. The protruding portion of the protruding piece 8c toward the diaphragm spring 5 side is the enlarged opening 5.
It is passed through on the opposite side to the clutch rotation direction of b.

Further, the cone spring 8 is set so that the biasing load applied to the diaphragm spring 5 changes depending on the change in the amount of deflection of the diaphragm spring 5, as shown by the solid line E in FIG. Fifth
In the figure, the arrows written along the horizontal axis indicate the direction in which the amount of deflection of the diaphragm spring 5 increases and the direction in which the amount of deflection of the cone spring 8 decreases.

In a pull-type clutch cover assembly having such a configuration, when the clutch is connected, the amount of deflection of the diaphragm spring 5 decreases due to wear of the facing 2, and the load increases from point B to point C. When decreasing from to point D,
In order for the inner peripheral portion of the diaphragm spring 5 to move toward the pressure plate 3 using the outer fulcrum C1 as a fulcrum, the cone spring 8 is compressed in the axial direction using the tip of the protruding piece 8a as a fulcrum, and the amount of deflection of the cone spring 8 is reduced. increases, and the load increases in the opposite direction (negative direction) to the direction of the load on the diaphragm spring 5, that is, from point F to point G.
decreases from to point H. Therefore, the changing loads of the diaphragm spring 5 and the cone spring 8 cancel each other out, and the change in the load (pressure contact force) of the diaphragm spring 5 on the pressure plate 3 changes from the solid line A to the broken line A', and when the clutch is in use, The generation of excessive pressure contact force is almost eliminated.

In addition, in the clutch disengaged state, the inner circumferential portion of the diaphragm spring 5 moves toward the opposite side of the pressure plate 3 using the outer supporting point C1 as a fulcrum, so that there is a gap between the inner circumferential edge of the cone spring 8 and the diaphragm spring 5. An axial gap is created in the fulcrum land 3a, making it easy for the cone spring 8 to rotate or vibrate in the axial direction. Therefore, the cone spring 8 is prevented from rotating relative to the pressure plate 3, and the cone spring 8 does not rotate relative to the pressure plate 3, diaphragm spring 5, or clutch cover 4. Furthermore, since the protruding piece 8b and both circumferential side walls of the groove 32 are in contact with each other without any gaps, even if vibrations from the engine are transmitted to the cone spring 8, the protruding piece 8b and both side walls of the groove 32 will not collide with each other. Therefore, no abnormal noise is generated due to rotation of the cone spring 8 or vibration in the axial direction. Also, the protruding piece 8
b and both side walls of the groove portion 32 will not wear out.

Further, the protruding piece 8c whose tip is bent in the clutch rotation direction is passed through the enlarged opening 5b, and at this time, the protruding part of the protruding piece 8c toward the diaphragm spring 5 side is opposite to the clutch rotation direction of the enlarged opening 5b. Since the cone spring 8 is passed through toward the side, when the cone spring 8 rotates together with the pressure plate 3 and the diaphragm spring 5, the enlarged opening opens from the rear of the diaphragm spring 5 along the protruding piece 8c as shown by arrow B in FIG. There is a flow of air passing through section 5b. The air flow is indicated by arrow C in Figure 3.
As shown in FIG. 1, the flow crosses the pressure plate 3 and facing 2 and exits through a hole 10 (FIG. 1) on the outer periphery of the clutch cover 4. Therefore, the pressure plate 3 and the facing 2 are cooled by the flow of air passing through the enlarged opening 5b along the protruding piece 8c.

FIG. 6 is a partial vertical sectional view showing a pull type clutch cover assembly according to the second invention of the present application. Portions corresponding to those in FIG. 1 are given the same reference numerals. 18 is a cone spring.

The cone spring 18 is arranged between the diaphragm spring 5 and the clutch cover 4. The inner peripheral edge of the cone spring 18 is marked with the marks shown in FIG.
As shown in FIG. 7, the diaphragm spring 5
A protruding piece 1 that protrudes to the side and passes through the enlarged opening 5b
8a is formed, and the tip 1 of the protruding piece 18a
8b is bent radially outward. The circumferential width of the protruding piece 18a is the same as the circumferential width of the enlarged opening 5b on the radially outer side.

The outer peripheral edge of the cone spring 18 is attached to the diaphragm spring 5 on the inner surface of the clutch cover 4.
It is brought into contact with the pressure plate 3 from the opposite side,
The protruding piece 18a is passed through the enlarged opening 5b toward the outside in the radial direction, and the surface of the tip portion 18b on the diaphragm spring 5 side is inserted into the enlarged opening 5 when the clutch is connected.
It is provided so as to come into contact with the radially outer edge of b from the pressure plate 3 side.

Further, the deflection amount and load characteristics of the cone spring 18 are set similarly to the cone spring 8 of the first invention.

In the pull type clutch cover assembly having such a configuration, when the clutch is connected, as the facing 2 wears out, the inner circumference of the diaphragm spring 5 moves toward the pressure plate 3 using the outer fulcrum C1 as a fulcrum. Then, the protruding piece 18a of the cone spring 18 moves toward the pressure plate 3 in the axial direction together with the diaphragm spring 5, and the cone spring 18 becomes compressed in the axial direction using its outer peripheral edge as a fulcrum.
Therefore, the cone spring 18 biases the diaphragm spring 5 in the opposite direction from the pressure plate 3. Therefore, similarly to the first invention, the generation of excessive contact force during use of the clutch is almost eliminated.

Further, since the protruding piece 18a of the cone spring 18 is passed through the enlarged opening 5b, the cone spring 18 is prevented from rotating relative to the diaphragm spring 5, and does not rotate relative to the diaphragm spring 5 or the clutch cover 4. Moreover, in the clutch disengaged state, the surface of the tip 18b of the protruding piece 18a on the diaphragm spring 5 side and the enlarged opening 5b
A gap is created between the cone spring 18 and the radially outer edge of the cone spring 18, and the cone spring 18 is likely to vibrate in the circumferential direction and axial direction.
Since it is in contact with both edges in the circumferential direction of
The protruding piece 18a and both side edges of the enlarged opening 5b do not collide with each other, and no abnormal noise is generated due to vibration of the cone spring 18 in the circumferential direction or the axial direction. Further, both side edges of the protruding piece 18a and the enlarged opening 5b are not worn out.

(Effect of the invention) As described above, according to the first invention of the present application, the cone spring 8 is arranged such that the tip of the first protruding piece 8a is brought into contact with the stepped portion 31 of the Fulcrum land 3a from the diaphragm spring 5 side. , since the inner peripheral edge is provided so as to come into contact with the diaphragm spring 5 from the pressure plate side when the clutch is connected, the diaphragm spring 5
When the inner circumference of the diaphragm spring 5 moves toward the pressure plate 3, the diaphragm spring 5 becomes the cone spring 8.
As a result, the pressure plate 3 is biased to the opposite side, and in the pull type clutch,
It is possible to prevent the load on the diaphragm spring 5 from increasing more than necessary during use of the clutch, and it is possible to prevent the required pedal force from increasing on the clutch pedal.

Furthermore, since the second protruding piece 8b of the cone spring 8 is fitted into the groove 32 of the Fulcrum land 3a, the cone spring 8 rotates relative to the pressure plate 3, clutch cover 4, etc. even when the clutch is disengaged. Furthermore, since the protruding piece 8b is in contact with both circumferential walls of the groove 32 without any gaps, the occurrence of abnormal noise and wear caused by the protruding piece 8b and both side walls of the groove 32 colliding with each other is prevented. can.

Furthermore, since the third protruding piece 8c of the cone spring 8 is passed through the enlarged opening 5b of the diaphragm spring 5, the rotation of the cone spring 8 causes the enlarged opening 5b to be opened from the rear side of the diaphragm spring 5 along the protruding piece 8c. The pressure plate 3 and the facing 2 can be cooled by generating a flow of air passing therethrough.

According to the second invention, the cone spring 1
8, the outer peripheral edge is brought into contact with the inner surface of the clutch cover 4 from the side opposite to the diaphragm spring 5, and the protruding piece 18a provided on the inner peripheral edge is used as an axial pressure plate integrally with the diaphragm spring 5 when the clutch is connected. Since the inner peripheral part of the diaphragm spring 5 moves toward the pressure plate 3 side in the clutch connected state, the diaphragm spring 5 is pressed by the cone spring 18, as in the first invention. The force is applied to the side opposite to the sear plate 3, and in a pull type clutch, it is possible to prevent the load on the diaphragm spring 5 from increasing more than necessary during use of the clutch, and to reduce the required pedal force on the clutch pedal. It can be prevented.

Further, since the protruding piece 18a provided on the inner circumference of the cone spring 18 is passed through the enlarged opening 5b, the cone spring 18 is connected to the diaphragm spring 5.
The projecting piece 18a can be prevented from rotating relative to the clutch cover 4, etc., and since the protruding piece 18a is in contact with both circumferential edges of the enlarged opening 5b without any gaps, the protruding piece 18a and both edges of the enlarged opening 5b can be prevented from rotating. This prevents abnormal noise and wear caused by collisions between the parts.

(Another embodiment) In the above embodiment of the second invention, the protruding piece 18a that passes through the enlarged opening 5a is attached to the cone spring 1.
8, but it may be a separate piece. FIG. 8 is a vertical cross-sectional partial view showing an example, and FIG. 9 is a perspective partial view showing the main part.
81 is a cone spring, and 82 is a disc annular body having a protruding piece 82b provided separately from the cone spring 81. The ring-shaped main body 82a of the disc annular body 82 is arranged so that it comes into contact with the radially outer edge of the enlarged opening 5b from the pressure plate 3 side when the clutch is connected.
As shown in FIG. 10, a protruding piece 82b is formed on the inner peripheral edge of the enlarged opening 5b and protrudes through the radially outer side of the enlarged opening 5b. The circumferential width of the protruding piece 82b is the same as the circumferential width of the radially outer side of the enlarged opening 5b. Further, the tip portion 82b of the protruding piece 82b is bent radially outward. The cone spring 81 has an outer peripheral edge abutted against the inner surface of the clutch cover 4 from the side opposite to the diaphragm spring 5 and pressure plate 3, and an inner peripheral edge formed by bending the tip 82c of the protruding piece 82b. diaphragm spring 5
It is being touched from the side.

With this, as in the above embodiment, when the inner circumferential portion of the diaphragm spring 5 moves toward the pressure plate 3 side when the clutch is connected, the inner circumferential edge of the cone spring 81 is compressed in the axial direction together with the protruding piece 82b. Moving toward the plate 3 side, the cone spring 81 is compressed in the axial direction using the outer periphery as a fulcrum, urging the diaphragm spring 5 in the opposite direction from the pressure plate 3, which prevents excessive contact force during use of the clutch. The occurrence can almost be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional partial view showing a pull type clutch cover assembly according to the first invention of the present application;
Figure 2 is a perspective partial view showing the Fulcrum land in the example shown in Figure 1, Figure 3 is a perspective partial view showing the main parts of the example in Figure 1, and Figure 4 is the cone spring in the example shown in Figure 1. FIG. 5 is a partial view showing the deflection amount and load characteristics of the diaphragm spring and the cone spring. FIG. 6 is a vertical cross-sectional partial view showing the pull type clutch cover assembly according to the second invention.
The figure is a perspective partial view showing the cone spring of the example shown in FIG. 6, FIG. 8 is a partial vertical cross-sectional view showing another embodiment of the second invention, and FIG. 9 is a main part of the example shown in FIG. 8. FIG. 10 is a perspective partial view showing the disc annular body of the example shown in FIG. 8, and FIG. 11 is a vertical cross-sectional partial view showing a conventional pull type clutch cover assembly. 3... Pressure plate, 3a... Fulcrum land, 4... Clutch cover, 5... Diaphragm spring, 5a... Slit, 5b...
... Enlarged opening, 6... Release bearing, 8, 18...
...Cone spring, 8a, 8b, 8c...Protrusion piece, 32...Groove portion.

Claims (1)

[Claims for Utility Model Registration] (1) A diaphragm spring having an enlarged opening at the radially outer end of a radial slit,
The outer supporting point of the diaphragm spring is supported by the clutch cover, the intermediate supporting point is in contact with the fulcrum land of the brake plate, the inner supporting point is supported by the release bearing, and the release bearing is opposite to the pressure plate. In the pull type clutch, which disconnects the clutch by moving the clutch axially rearward, grooves are provided at multiple locations spaced apart in the circumferential direction of the Fulcrum land, and a disc-shaped cone spring is attached to the pressure plate. and the diaphragm spring, and a second protruding piece provided at the tip of the first protruding piece facing radially outward provided on the outer periphery of the cone spring is inserted into the groove to remove the first protruding piece. A third protrusion whose tip abuts against the fulcrum land from the diaphragm spring side, and a third protrusion that protrudes toward the diaphragm spring and whose tip is bent in the clutch rotation direction provided on the side edge of the protrusion piece on the clutch rotation direction side. A pull type clutch cover assembly characterized in that the piece is passed through the enlarged opening with a gap left in the direction of clutch rotation, and the inner peripheral edge of the cone spring is provided in contact with the diaphragm spring. (2) Support the outer fulcrum of the diaphragm spring with the clutch cover, and abut the intermediate fulcrum against the fulcrum land of the pressure plate.
In a pull type clutch, the inner supporting point is supported by a release bearing, and the clutch is shut off by moving the release bearing axially rearward on the opposite side from the pressure plate.A disc-shaped cone spring is connected to the diaphragm spring and the clutch. The outer peripheral edge of the cone spring is placed in contact with the inner surface of the clutch cover from the side opposite to the pressure plate of the diaphragm spring, and the inner peripheral edge is placed integrally with the diaphragm spring on the pressure plate side in the axial direction. A pull type clutch cover assembly characterized in that it is provided so as to be moved.