JPS61228128A - Diaphragm spring type clutch - Google Patents

Abstract

PURPOSE:To decrease a wearing amount of a facing, by disclosing the back surface of a pressure plate to the outside space and efficiently releasing heat of the pressure plate or the like. CONSTITUTION:A clutch, providing a diaphragm spring 35 between the peripheral part of a pressure plate 2 and a clutch cover 13, enables a heat radiating effect of the pressure plate 2 to be enhanced by opening the back surface of the pressure plate 2 to the outside space 37, Accordingly, the clutch, suppressing a temperature rise of the pressure plate 2 and a facing 3, enables a wearing amount of the facing 3 to be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a type 111 in which a pressure plate is biased by a die-shrinking flamm spring. Regarding friction clutches.

(Prior art) Conventionally, some diaphragm spring type clutches have a fourth
It is constructed as shown in the figure (schematic cross-sectional view).

In FIG. 4, the flywheel 1 is connected to the output shaft of an engine (not shown). An annular pressure plate 2 is opposed to the flywheel 1, and an annular JII is disposed between the flywheel 1 and the pressure plate 2.
WA facing 3 is arranged. The facing 3 is a member provided on the outer periphery of the clutch disc 6 that is connected to the output shaft 5 (only the center line is shown). When the facing 3 is pressed against the flywheel 1 by the pressure plate 2, the clutch is connected and the pressure is applied. The clutch is disengaged by releasing the pressing force from the plate 2 to the facing 3.

A protrusion 7 protruding in the opposite direction to the facing 3 is provided on the back surface of the pressure plate 2, and a diaphragm spring 9 is in contact with the tip of the protrusion 7. Spring 9
is for obtaining the above-mentioned pressing force, and is connected to the projection 7 by a clip 10 fixed to the projection 7. The inner circumference of the spring 6 is connected to a release bearing 11 near the output axis 5. Further, the outer periphery of the spring 6 is supported by a clutch cover 13 via a wire ring 12. Clutch cover 13 is pressure plate 2
It is a member that covers the outer periphery of the flywheel 1 and is fixed to the flywheel 1.

(Problem to be Solved by the Invention) However, according to the above configuration, since the spring 9 covers the internal space 15 in which the pressure plate 2 is installed in a substantially closed state, the pressure plate 2 and the facing 3
cannot be cooled sufficiently by outside air, and as a result,
There is a problem in that the facing 3 (particularly the surface in pressure contact with the pressure plate 2) is heavily worn. Furthermore, since the protrusion 7 protrudes too much from the main body of the pressure plate 2, there is also the problem that the axial dimension of the entire clutch is large.

(Another way to solve the problem g2) In order to solve the above problem, the present invention connects a release mechanism to the inner circumference of the pressure plate, and also provides an annular structure between the outer circumference of the pressure plate and the clutch cover. It is characterized in that a diaphragm spring is arranged, the inner periphery of the diaphragm spring is connected to the outer periphery of the pressure plate, and the outer periphery is connected to the clutch cover.

(Function) In the clutch disengagement operation, the release mechanism acts directly on the pressure plate in response to the depression of the clutch pedal, etc., and separates the pressure plate from the facing. Further, in the clutch engagement operation, the pullback force from the release mechanism is released, so the diaphragm spring pushes the pressure plate and brings it into pressure contact with the facing.

(Example) In FIG. 1, which is a schematic cross-sectional view, the same parts as those in FIG.

The pressure plate 2 of FIG. 1 does not have a protrusion corresponding to the protrusion 7 of FIG. 4. For example, cooling fins 20 are provided radially on the back surface of the pressure plate 2. The pressure plate 2 extends radially inward to the vicinity of the output shaft 5, and has a cylindrical portion 21 on its inner periphery. Cylindrical part 2
1 protrudes from the inner periphery of the main body of the pressure plate 2 in a direction opposite to the flywheel 1, and an annular release bearing 11 is attached to the outer periphery of the protruding end of the cylindrical portion 21 using a snap ring 22. The release bearing 11 is connected to a clutch pedal via a mechanism not shown, and when the clutch pedal is depressed, the release bearing 11 moves in a direction R away from the flywheel 1.

The clutch cover 13 has a generally cylindrical shape and is located on the outside of the pressure plate 2 and the facing 3 in the radial direction.

An outward 7-flange 26 is provided at one end of the clutch cover 13, and the flange 26 is fixed to the outer circumference of the flywheel 1 by a plurality of bolts 24 (only one is shown). An inward flange 27 is provided at the other end of the clutch cover 13.
is the provision. Further, the cylindrical body 28 of the clutch cover 13 is provided with a plurality of two bending protrusions (only one is shown) spaced apart in the circumferential direction and projecting outward in the radial direction. One end of an elastic strap 31 is fixed to each projection 29 with a rivet or the like. The elastic strap 31 extends to near the outer periphery of the flywheel 1 through a notch 32 provided in the main body 28, and the other end is fixed to a protrusion 33 on the outer periphery of the pressure plate 2 with a rivet or the like. The elastic strap 31 connects the pressure plate 2 to the flywheel 1 in a manner that is non-rotatable and movable in the axial direction.

An annular diaphragm spring 3 is disposed between the cylindrical body 28 of the clutch cover 13 and the outer periphery of the pressure plate 2.
5 is the placement. A wire ring 36 is seated on the inner surface of the flange 27 and the inner surface of the end of the main body 28 in the vicinity thereof, and the outer peripheral portion of the spring 35 is seated on the wire ring 36 from the side opposite to the flange 27. . The inner circumference of the spring 35 is seated on the back surface of the outer circumference of the annular body of the pressure plate 2. The cooling fin 2
0 is provided radially inward from the portion where the spring 35 is seated, and the inner periphery of the spring 35 is located near the cooling fin 20.
abuts or is close to the radially outer edge of the

According to the above configuration, by depressing the clutch pedal and moving the release bearing 11 in the direction of arrow R,
The pressure plate 2 moves in the same direction while compressing the diaphragm spring 35. As a result, the pressing force from the pressure plate 2 to the acing 3 is released,
The clutch is disengaged.

When the clutch pedal is released, the preflex plate 2 presses the facing 3 against the flywheel 1 under the restoring force of the spring 35, thereby connecting the reflatch.

When the clutch operates as described above, friction between the facing 3, flywheel 1, and pressure plate 2 generates heat in these parts.

However, the back side of the pressure plate 2 is exposed to the external space 37. Therefore, the heat of the pressure plate 2 and the facing 3 efficiently escapes from the back surface of the pressure plate 2 to the external space 37. Also, in both the connected state and the disconnected state, the pressure plate 2 rotates together with the flywheel 1 and the clutch cover 13, so there are cooling fins 20 on the back of the pressure plate 2 as shown in the figure.
According to the structure in which the pressure plate 2 and the facing 3 are provided, heat from the pressure plate 2 and the facing 3 escapes from the cooling fins 20 to the external space 37 particularly efficiently.

(Effects of the Invention) As explained above, according to the present invention, by providing the diaphragm spring 35 between the outer circumference of the pressure plate 2 and the clutch cover 13, the back surface of the pressure plate 2 is opened to the external space 37. Since the heat dissipation effect of the pressure plate 2 can be enhanced, the temperature increase 4 of the pressure plate 2 and the facing 3 can be suppressed and the amount of wear of the facing 3 can be reduced. In addition, it is breathable like the conventional product! Since it is not necessary to provide the protrusion 7 on the back surface of the plate 2, the axial dimension of the clutch can be shortened. Furthermore, since the protrusion 7 can be eliminated and a diaphragm spring 35 with a short radial width can be used, the weight 1 can also be reduced.

(Another embodiment) As shown in FIG. 2, a plurality of diaphragm springs 35 are
They can also be used in a stacked manner, with a wire ring 36 interposed between the inner and outer circumferential portions, and in this case, the pressing force of the spring 35 against the pressure plate 2 can be increased.

In the embodiment shown in FIG. 2, the outer peripheral part of each diaphragm spring 35 is supported by the clutch cover 13, and the inner peripheral part is supported by the pressure plate 2. However, instead of this structure, as shown in FIG. Of the diaphragm springs 35, the outer peripheral parts and the inner peripheral parts of two adjacent springs 35 can be connected to each other, and in this way, the amount of deflection of the entire spring 35 can be increased.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of an embodiment of the present invention, Fig. 2 is a schematic cross-sectional view of another embodiment, Fig. 3 is a schematic cross-sectional view of yet another embodiment, and Fig. 4 is a schematic cross-sectional view of a conventional example. . DESCRIPTION OF SYMBOLS 1... Flywheel, 2... Pressure plate, 3... Friction facing, 11... Release bearing, 13...
...Clutch cover, 35...Diaphragm spring patent applicant Daikin Manufacturing Co., Ltd. r ('J CQ r-r-F) Procedural amendment (voluntary) May 1, 1985 Patent application No. 70519 No. 2, name of invention diaphragm spring type clutch 3, relationship to the case of the person making the amendment Patent applicant address 1-1-1 Kida Motomiya, Neyagawa City Name Daikin Seisakusho Co., Ltd. Representative Director and President Masaru Sadatsu 4 , Agent address: 10th floor, East Building, Chiyoda Building, 2-9-4 Higashitenma, Kita-ku, Osaka (ψ530) 5. Date of amended order (shipment date): Showa year, month, day, 6,
Target of correction Specification 7, contents of correction (1) 1 Spring 6 on page 3, line 7 of the specification is corrected to ``Spring 9.'' 2) Change "Spring 6" on page 3, line 9 to "Subry"
” he corrected. that's all

Claims (1)

[Claims] A flywheel which is an input member, an annular pressure plate facing the flywheel, a friction facing arranged between the flywheel and the pressure plate and connected to the output section, and a friction facing connected to the inner circumference of the pressure plate to provide pressure. A release mechanism for moving the plate in the clutch disengagement direction, a clutch cover fixed to the outer periphery of the flywheel and covering the outer periphery of the pressure plate, and an annular clutch disposed between the outer periphery of the pressure plate and the clutch cover. A diaphragm spring is provided, the inner periphery of the diaphragm spring is connected to the outer periphery of the pressure plate, the outer periphery is connected to the clutch cover, and the pressure plate is urged toward the flywheel by the diaphragm spring. Diaphragm spring type clutch.