JPH0543295Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a clutch cover assembly that facilitates the engagement of a clutch.

[Prior Art] In general, in the process of transition from a clutch disengaged state to an engaged state, if the rotational torque increases smoothly at the initial stage of clutch engagement, the ride will be more comfortable and the driver will be able to engage the clutch more easily.

Conventionally, between a pair of friction facings,
A structure is known in which the clutch is connected by a cushioning plate having elasticity in the axial direction to smoothly increase the rotational torque at the initial stage of clutch engagement. However, since the cushioning plate is also a torque transmitting member from the friction facing to the spline hub,
It is necessary to maintain high rigidity, and therefore there is a limit to the ability of the cushioning plate to improve the driving feeling at the initial stage of clutch engagement.

Therefore, recently, an annular wave wiring that undulates in the axial direction has been installed between the protrusion on the back of the pressure plate and the outer circumference of the diaphragm spring, and the outer circumference of the diaphragm spring is seated on this wave wiring for initial clutch connection. A structure has been proposed that smoothly increases the rotational torque of the motor (for example, Utility Model Publication No. 59-2337).

[Problem to be solved by the invention] However, with this structure, when the clutch is connected, the wave wiring is always pressed by the full load of the diaphragm spring, so sometimes it is in a fully compressed state, and the spring of the wave wiring is pressed. Strength becomes weaker. Therefore, as the device continues to be used, the spring constant of the wave wiring tends to change.

Furthermore, JP-A No. 62-224729 discloses a pressure plate, a protrusion extending in the same circumferential direction on the back surface of the pressure plate with a gap therebetween, and protruding toward the outer periphery of the diaphragm spring. and a diaphragm spring whose outer periphery is seated on the wire ring, the diaphragm spring having a rib extending in the radial direction and protruding toward the middle of the gap, A structure is disclosed in which the rib is brought into contact with a portion of the wire ring that faces the intermediate portion of the wire ring, whereby the rib presses the wire ring to obtain cushioning characteristics in the axial direction. There is.

However, in this structure, a rib extending in the radial direction of the clutch is integrally provided with the diaphragm spring, so unless the rib is accurately opposed to the middle part of the diaphragm spring, the spring characteristics may not be determined accurately. Therefore, when adopting the above structure, the processing position of the rib, the pressure plate,
Since the diaphragm spring must be assembled with great precision, processing costs are high.
Furthermore, even a slight misalignment may change the spring characteristics, making it difficult to use in clutch cover assemblies that are subject to shocks and vibrations.

The present invention aims to solve the above problems.

[Means for Solving the Problems] The present invention includes an annular pressure plate disposed within a clutch cover and a diaphragm spring disposed behind the pressure plate, and the clutch cover A clutch cover is provided with a fulcrum mechanism that supports the radially intermediate portion of the diaphragm spring on the inner peripheral edge via a pair of wire rings, and the pressure plate has a protrusion that protrudes on the same circumference on the back side of the clutch cover. In the assembly, the diaphragm spring is
The protrusion is provided with an outer circumferential annular portion whose outer circumferential portion separates when the clutch is disengaged and contacts the pressure plate when the clutch is engaged to apply a pressing load to the pressure plate, and the outer circumferential annular portion of the diaphragm spring overlaps with the pressure plate side. and a sub-plate supported by the fulcrum mechanism, and the sub-plate approaches the pressure plate as it goes outward in the radial direction of the clutch so that its outer peripheral edge is radially smaller than the protrusion of the pressure plate. This clutch cover assembly is characterized in that it is integrally equipped with a cone spring part that is always elastically pressed against the inner back surface of the clutch cover.

[Function] When the clutch is engaged, the outer annular portion of the diaphragm spring seats on the protrusion and presses the pressure plate, and the cone spring portion of the sub-plate is compressed between the diaphragm spring and the pressure plate. It's getting old.

When the clutch is closed, the outer annular portion is separated from the protrusion by the spring force of the cone spring portion, and only the cone spring portion comes into contact with the back surface of the pressure plate. When the clutch is connected again, the cone spring section bends as the outer annular portion approaches the protrusion until the outer annular portion is seated on the protrusion, thereby performing a cushioning function.

[Example] In FIG. 1, which is a longitudinal sectional view of the present invention, the left side of the figure is assumed to be the front.

As shown in FIG. 1, the outer periphery of a clutch cover 10 employing the present invention is concentrically fixed to an annular flywheel 12 on the engine side by bolts 11. Inside the clutch cover 10, from the flywheel 12 side, a clutch disk 13,
A pressure plate 14 and a diaphragm spring 15 are arranged concentrically, and an output shaft 17 (only the center line is shown), which is also the input shaft of a transmission (not shown), is splined to the boss tube 16 of the clutch disk 13. They are mated. Reference numeral 18 denotes an elastic strap, one end of which is fixed to the outer periphery of the pressure plate 14 and the other end fixed to the inner surface of the clutch cover 10. The elastic strap 18 is attached to the clutch cover 1 with the pressure plate 14 slightly biased toward the clutch disconnection side.
0 to transmit the rotational force of the clutch cover 10 to the pressure plate 14, and to move the pressure plate 14 slightly rearward when the clutch is disengaged.

For example, eight protrusions 19 are integrally formed on the back surface of the pressure plate 14 and extend in the same circumferential direction at a certain distance. and protrusion 19
The outer annular portion 2 of the diaphragm spring 15 is
0 is seated. The outer circumferential annular portion 20 is held between the projection 19 and the clip 21 . Here, the clip 21 of this embodiment has enough flexibility to allow the outer annular portion 20 to move slightly away from the protrusion 19 when the clutch is disengaged (FIG. 3), which will be described later. It is biased toward the 19 side.

The diaphragm spring 15 is integrally provided with a plurality of tongues 22 extending toward the center, and a square window 24 is provided at the radially outer end of a slit 23 between each tongue 22. Here, in the present invention, an annular sub-plate 25 is arranged on the front surface of the diaphragm spring 15 so as to overlap concentrically. The outer diameter of the sub-plate 25 is smaller than the outer diameter of the diaphragm spring 15, and the inner diameter is larger than the inner diameter of the diaphragm spring 15.

As shown in FIG. 2, the sub-plate 25 is provided with a slit 26 and a square window 27 facing the slit 23 and square window 24, respectively. A tab 28 formed at the inner peripheral end of the clutch cover 10
is fitted into both corner windows 24 and corner window 27, and this tab 28 supports the diaphragm spring 15 and sub-plate 25 as a fulcrum via a pair of wire rings 29, 29.

The outer peripheral edge of the sub-plate 25 forms a cone spring portion 30 that is inclined forward as it goes outward in the radial direction of the clutch. Cone spring part 3
0 is in elastic contact with the back surface 35 of the pressure plate 14, that is, on the inner peripheral side of the clutch than the protrusion 19, and in the clutch connected state shown in FIG. 1, the diaphragm spring 15 and the pressure plate 14 and is in a compressed state.
Note that 31 is a well-known release bearing.

According to the above structure, when the clutch is connected as shown in FIG. 1, the outer annular portion 20 of the diaphragm spring 15 is seated on the protrusion 19 while the cone spring portion 30 of the sub-plate 25 is compressed. Therefore, the diaphragm spring 15 urges the pressure plate 14 toward the flywheel 12, and the pressure plate 14 presses the friction facing 13a of the front clutch disk 13 against the flywheel 12 by its pressing force. ing. During operation, the rotational force of the flywheel 12 is transmitted from the clutch disk 13 to the output shaft 17.

When a clutch connection/disconnection mechanism (not shown) is operated, the release bearing 31 moves forward and presses the back surface of the inner peripheral end of the diaphragm spring 15.
As a result, the outer circumferential annular portion 20 of the diaphragm spring 15 moves rearward using the pair of wire rings 29, 29 as fulcrums due to the action of the lever.
The pressure plate 14 also moves rearward due to the urging force of the strap 18, and the friction facing 13a
to open. This causes the clutch to shut off. In this state, the outer circumferential annular portion 20 of the diaphragm spring 15 moves rearward to separate from the protrusion 19 by the cushion amount of the cone spring portion 30, and at the same time, the outer circumferential annular portion 20 of the diaphragm spring 15 moves backward.
While the outer peripheral edge of the pressure plate 14 remains in contact with the back surface 35 of the pressure plate 14, it attempts to return to the shape in the free state. Therefore, as shown in FIG. 3, the outer circumferential annular portion 20 of the diaphragm spring 15 comes to rest at a position slightly separated from the protrusion 19 at which the clutch is completely disconnected.

Next, when the release bearing 31 is moved rearward by the clutch connection/disconnection mechanism to connect the clutch from the clutch disengaged state shown in FIG.
0 rotates forward again. At this time, as the diaphragm spring 15 rotates, the sub-plate 25 also rotates around its fulcrum, so the pressing force of the outer circumferential annular portion 20 is buffered by the elasticity of the cone spring portion 30 of the sub-plate 25. The pressure plate 14 is therefore loosely attached to the friction facing 1.
3a is pressed against the flywheel 12, the rotational force of the flywheel 12 is also smoothly transmitted to the friction facing 13a, and the rotational torque at the initial stage of clutch engagement increases smoothly.

[Effects of the Invention] As explained above, according to the present invention, the diaphragm spring 15 has an outer peripheral annular portion whose outer peripheral portion is attached to the protrusion 19 when the clutch is disengaged, and comes into contact with the protrusion 19 when the clutch is engaged to apply a pressing load to the pressure plate 14. 20 is provided, and the pressure plate 14 of the outer peripheral annular portion 20 of the diaphragm spring 15 is provided.
A sub-plate 25 is provided which is stacked on the side and supported by a fulcrum mechanism (duff 28, wiring 29) on the inner peripheral edge of the clutch cover 10, and the sub-plate 25 is attached to the pressure plate 14 as it goes outward in the radial direction of the clutch. Since it is integrally equipped with a cone spring portion 30 that approaches and whose outer peripheral edge always elastically presses against the back surface 35 on the radially inner side of the protrusion 19 of the pressure plate 14, the clutch is closed even when the clutch is disengaged (FIG. 3). When transitioning to the engagement state (FIG. 1), the rotational torque at the initial stage of clutch engagement increases smoothly, the operational feeling is improved, and the driver's clutch engagement/disconnection operation becomes easier.

Moreover, according to the present invention, while the cone spring portion 30 of the sub-plate 25 is compressed between the diaphragm spring 15 and the pressure plate 14 when the clutch is connected, the outer circumferential annular portion 20 of the diaphragm spring 15 is pressed against the protrusion 19. Since the user is seated and presses the pressure plate 14, it is possible to prevent the cone spring portion 30 from being fully compressed.

Furthermore, according to the present invention, cushioning properties are obtained by the cone spring portion 30 integrated with the sub-plate 25, so that the deflection characteristics are stabilized.
There is no risk of localized wear even if rapid connection and disconnection operations are repeated.

Note that when implementing the structure described in FIGS. 1 to 3, a stud pin may be used instead of the tab 28.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the present invention showing the clutch connected state, Fig. 2 is a partial front view showing the assembled state of the diaphragm spring and sub-plate of Fig. 1, and third is a longitudinal sectional view of the present invention showing the clutch disengaged state. FIG. 10...Clutch cover, 13...Pressure plate, 15...Diaphragm spring, 1
9...Protrusion, 20...Outer annular portion, 25...Subplate, 30...Cone spring portion.

Claims (1)

[Scope of utility model registration request] The clutch cover includes an annular pressure plate disposed within the clutch cover and a diaphragm spring disposed behind the pressure plate, and the clutch cover is connected to the diaphragm spring via a pair of wire rings on its inner peripheral edge. The clutch cover assembly is provided with a fulcrum mechanism that supports the radially intermediate portion of the clutch cover assembly as a fulcrum, and the pressure plate is provided with a protrusion that protrudes on the same circumference on the back surface of the clutch cover assembly. An outer annular portion is provided, the outer annular portion of which separates when the clutch is disengaged and contacts the pressure plate to apply a pressing load to the pressure plate when the clutch is engaged, and which is superimposed on the pressure plate side of the outer annular portion of the diaphragm spring and is attached to the fulcrum. A sub-plate supported as a fulcrum by a mechanism is provided, and the sub-plate approaches the pressure plate as it goes radially outward of the clutch and has an outer peripheral edge radially inward from the protrusion of the pressure plate. A clutch cover assembly characterized by being integrally equipped with a cone spring part that is always elastically pressed against the clutch cover assembly.