JPH0633948A - Clutch cover assembly - Google Patents

Abstract

(57) [Summary] [Purpose] The clutch pedal depressing force has a structure that reduces the clamping force of the diaphragm spring without reducing the strength of the bent portion of the clutch cover, and that the diaphragm spring does not rattle against the clutch cover. It is an object of the present invention to provide a clutch cover assembly that is light and can obtain a sufficient pressing force even when the clutch disc is abraded. [Constitution] At least a clutch cover (1), a diaphragm spring (3) and a pressure plate (2) are provided, and a pivot ring is provided at a bent portion (4) provided at an appropriate position on the circumference of the clutch cover (1). (5,
A clutch cover assembly in which the diaphragm spring (3) is sandwiched via 6), wherein the bent portion (4) of the clutch cover (1) is provided with a thin portion (15). Assembly.

Description

Detailed Description of the Invention

[0001]

The clutch cover assembly of the present invention can be used in vehicles, ships, machine tools and the like.

[0002]

2. Description of the Related Art As a conventional clutch cover assembly, the one disclosed in JP-A-62-220719 is known as a prior art. The above-mentioned prior art is a clutch that includes a clutch cover fixed to a flywheel, a pressure plate that clamps a clutch disk with the flywheel, and a diaphragm spring supported by the clutch cover to urge the pressure plate. A cover assembly is disclosed. In the clutch cover assembly, the diaphragm spring is sandwiched by a pair of pivot rings by bent portions provided at several places on the circumference of the clutch cover.

In the clutch cover assembly, when the release bearing is stroked to displace the rotational force transmitting function and the inner peripheral end of the diaphragm spring is displaced toward the pressure plate, the diaphragm spring fulcrums the pivot ring. By bending back, the outer peripheral portion of the diaphragm spring moves to the side opposite to the pressure plate, so that the pressure plate connected to the outer peripheral portion of the diaphragm spring is separated from the clutch disk. At this time, since the diaphragm spring is tilted by the amount of the pulled apart, the interval between the pair of pivot rings is widened. Further, as the wear of the clutch disc progresses, the diaphragm spring tilts in the direction opposite to that when the release bearing is stroked, and the interval between the pair of pivot rings is widened in the same manner as described above.

However, in the prior art couch cover assembly, since the diaphragm spring is fixed to the clutch cover, the diaphragm spring is clamped through the pivot ring at the bent portion, so that the pair of pivot rings is not compressed. The space is prevented from being widened, which increases the release force when the release bearing is stroked, that is, the clutch pedal stepping force is heavy, and makes it difficult to separate the pressure plate from the disc. Further, even if the clutch disc wears, the inclination of the diaphragm spring is hindered, so that the pressing force of the clutch cover assembly for holding the clutch disc is reduced, which causes the slip of the clutch.

As a conventional technique for solving the above problems,
There is Japanese Patent Laid-Open No. 1-312229, but in this conventional technique, a notch is provided in a bending portion that holds a diaphragm spring through a pivot ring of a clutch cover, and the bending portion is cut at a bending point of the bending portion. There is one that reduces the area, reduces the clamping force of the pivot ring at the bent portion, and reduces the force that hinders the inclination of the diaphragm spring.

However, in the prior art, since the cross-sectional area of the bent portion at the bending point is reduced, the bent portion is inferior in mechanical strength, and the folding is caused by the operation or vibration of the clutch cover assembly. The bent part may be broken. Also, since the clamping force of the diaphragm spring is small, repeated operation of the clutch cover assembly
The diaphragm spring may rattle against the clutch cover.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the clamping force of the diaphragm spring without lowering the strength of the bent portion of the clutch cover, and the diaphragm spring rattles against the clutch cover. It is an object of the present invention to provide a clutch cover assembly that has a structure that does not cause fear and that provides a sufficient pressing force even when the clutch disc wears, because the clutch pedal force is light.

[0008]

In order to solve the above-mentioned problems, in the present invention, at least a clutch cover, a diaphragm spring and a pressure plate are provided, and a bent portion is provided at an appropriate position on the circumference of the clutch cover. A clutch cover assembly in which the diaphragm spring is sandwiched by a pivot ring is provided with a thin wall portion at the bent portion of the clutch cover.

[0009]

According to the above-mentioned clutch cover assembly, since the bent portion of the clutch cover is provided with the thin wall portion, a space is created between the thin wall portion and the pivot ring holding the diaphragm spring. The pivot ring can be bent between the bent portion and the bent portion, so that the posture change of the diaphragm spring is not disturbed and the bent portion of the clutch cover is not expanded.

Therefore, the clutch pedal depressing force does not become heavy and the clutch cover pressing force does not decrease when the clutch disc wears. Further, there is no risk of the diaphragm spring rattling with respect to the clutch cover.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view of a clutch cover assembly according to the present invention, and FIG. 1 is a sectional view taken along line AA of FIG. In the figure, reference numeral 1 denotes a clutch cover, which is fixed to a flywheel of an engine (not shown). Reference numeral 2 is a pressure plate that clamps a clutch disk (not shown) with a flywheel. The diaphragm spring 3 is provided with a pivot ring 5, a bent ring 4 at a bent portion 4 provided on the inner peripheral end of the clutch cover 1 at equal intervals on the circumference.
It is attached to the clutch cover 1 by being pinched via 6. The diaphragm spring 3
Is in contact with the protrusion 7 of the pressure plate 2 at the outer peripheral end thereof, and is further engaged with the curl portion 10 of the retract spring 9 fixed to the pressure plate 2 by bolts 8 at equal positions on the circumference. . Further, the diaphragm spring 3 is provided with a plurality of slit portions 11 from the inner peripheral end thereof as in a general diaphragm spring, and the slits are notched to a position beyond the portion sandwiched by the pivot rings. There is.

FIG. 3 shows the shape of the bent portion 4 of the clutch cover 1 before press bending. In FIG. 3, after the diaphragm spring 3 and the pivot rings 5 and 6 are interposed at the inner peripheral end of the clutch cover 1, the tip portion 12 is press-bent counterclockwise approximately 90 ° in the lower part of the drawing, thereby The installation of the diaphragm spring 3 is completed. FIG. 4 is a diagram showing the view B of FIG. After press bending, a flat surface 14 is provided in the central portion in B view at a portion that is one side that presses the diaphragm spring 3, and a thin wall portion is formed in the bent portion 4 from the flat surface 14 toward both sides. Slopes 15 and 1 to be formed
5 is provided. The position of the pivot ring 6 in contact with the diaphragm spring 3 in the left-right direction in FIG. 1 is determined by the flat surface 14. Therefore, when the diaphragm spring 3 is attached to the clutch cover 1, the pivot ring 6 is And the inclined surface 1
A space is formed between 5 and 15.

Next, the operation of the clutch cover assembly will be described.

In the non-actuated state of the clutch cover assembly, when the diaphragm spring 3 is attached to the clutch cover 1, the outer peripheral edge of the clutch cover assembly is pressed by the projection 7 of the pressure plate 2, so that the pressure plate is 2 receives the reaction force from the diaphragm spring 3 and presses the clutch disk toward the flywheel.

When a clutch fork pedal (not shown) of the vehicle is stepped on and a release fork attached to the clutch case is operated, a release bearing (not shown) also moves to move the inner peripheral end 16 of the diaphragm spring 3 to the left in FIG. When it is pressed in the direction, the diaphragm spring 3 bends back with the portion sandwiched by the pivot rings 5 and 6 as a fulcrum, and its outer peripheral end moves to the right in FIG. At this time, the pressure plate 2 is released from the urging force from the diaphragm spring 3 and, at the same time, is pulled in the right direction in FIG. 1 by the diaphragm spring 3 via the retract spring 9 and moves in the same direction. Therefore, the force pressing the clutch disk is also released. The operation in which the clutch pedal is returned to the original position and the pressure plate 2 receives the urging force from the diaphragm spring 3 again is only the reverse of the release operation described above, and thus the description thereof is omitted here.

In the release operation of the clutch cover assembly described above, when the diaphragm spring 3 bends back with respect to the portion sandwiched by the pivot rings 5 and 6 as a fulcrum, the intervals between the pivot rings 5 and 6 are set to be small. Although it is pushed out, a space is provided between the pivot ring 6 and the inclined surface 15 of the clutch cover 1. Therefore, the pivot ring 5 is excluded except for the flat surface 14 pressing the pivot ring 6. , 6 is easily widened and the diaphragm spring 3 does not hinder the warp of the diaphragm spring 3 and its release force does not become heavy. Further, since the bent portion 4 is not provided with a notch or the like, the strength of the bent portion can be sufficiently secured, and the bent portion is not expanded, so that the diaphragm spring 3 does not rattle during operation.

The shape of the thin-walled portion of the bent portion according to the present invention is not limited to the above-mentioned embodiment, and the shape shown in FIGS.
As shown in Examples 7 and the like, various modifications can be made within a range satisfying the object of the present invention.

In FIG. 5, the thin portion is a flat surface having a step with respect to the bearing portion for sandwiching the diaphragm spring.
Shows a thin portion as a curved surface connected to a flat surface, and FIG. 7 shows that the bent portion of the clutch cover on which the diaphragm spring is held is formed by one curved surface.

[0020]

As described above, according to the present invention, since the bent portion provided at the inner peripheral end of the clutch cover for mounting the diaphragm spring is provided with the thin portion, the release force of the clutch cover assembly is reduced. There is no reduction in the pressing force during abrasion of the clutch disc, and since the bent portion is not provided with a notch or the like, the mechanical strength of the clutch cover is not reduced, and the long life of the clutch cover assembly can be maintained.
Further, since the bent portion is not expanded, the diaphragm spring does not rattle, which is also useful for preventing noise of a vehicle or the like.

Further, since the structure of the clutch cover assembly is not significantly changed, parts other than the clutch cover can be shared with the conventional product, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a clutch cover assembly of the present invention.

FIG. 2 is a plan view of a clutch cover assembly of the present invention.

FIG. 3 is a sectional view of a clutch cover of the present invention.

FIG. 4 is a detailed view of a bent portion of the clutch cover of the present invention.

FIG. 5 is a detailed view of a bent portion of a clutch cover showing another embodiment.

FIG. 6 is a detailed view of a bent portion of a clutch cover showing another embodiment.

FIG. 7 is a detailed view of a bent portion of a clutch cover showing another embodiment.

[Explanation of symbols]

1 Clutch cover 2 Pressure plate 3 Diaphragm spring 4 Bent parts 5, 6
Pivot ring 14 Flat surface 15 Inclined surface

Claims (4)

[Claims] 1. A clutch cover assembly including at least a clutch cover, a diaphragm spring, and a pressure plate, wherein a bent portion provided at an appropriate position on the circumference of the clutch cover holds the diaphragm spring via a pivot ring. The clutch cover assembly according to claim 1, wherein the bent portion of the clutch cover is provided with a thin portion. 2. The clutch cover assembly according to claim 1, wherein the thin wall portion is an inclined surface connected to a flat portion that holds the diaphragm spring. 3. The clutch cover assembly according to claim 1, wherein the thin portion is a curved surface connected to a flat portion that holds the diaphragm spring. 4. The clutch cover assembly according to claim 1, wherein the thin portion is a flat surface having a step with respect to a flat portion that holds the diaphragm spring.