JPH034830Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a clutch device used in a vehicle.

[Prior Art] For example, in a clutch device disclosed in Japanese Patent Publication No. 47-20286, a clutch plate and a holding plate are stacked on both sides of a clutch hub so that they can rotate relative to each other within a predetermined range, and A coil spring is housed inside the square window provided in the plate to suppress relative rotation due to torque fluctuations. In other words, one end of the coil spring is brought into contact with one side edge of the square window between the clutch plate and the retaining plate, and the other end of the coil spring is brought into contact with the other side edge of the square window of the clutch hub, thereby suppressing torque fluctuations from the internal combustion engine. It will be done.

Since the clutch plate and retaining plate are thinner than the clutch hub, the load on the side edge of the square window between the clutch plate and retaining plate received from the coil spring is due to the contact of the end of the coil spring against the side edge of the square window. It changes greatly depending on the contact position. The coil spring tends to be pulled radially outward within the square window due to centrifugal force, and as a result, the contact area between the end of the coil spring and the side edge of the square window also tends to move radially outward. .

In addition, the distance between the outer peripheral edge of the square window of the clutch plate and retaining plate and the outer peripheral edge of the clutch plate and retaining plate is as follows:
It is regulated by the outer diameter of the clutch hub. If the thickness of the clutch plate and the retaining plate is small and the distance is small, the strength against tearing of the square window will not be sufficient. Therefore, if an excessive load of the coil spring acts on the radially outward side portion of the side edge of the square window, cracks may occur in the radially outward corner portion of the square window.

In the clutch device disclosed in Japanese Utility Model Application Publication No. 50-153337, an elliptically wound spring is held in a corner window of a clutch hub. By making the spring oval, the dimensions of the side edges of the square window can be shortened without sacrificing strength, and the outer diameter of the clutch hub can be shortened by that amount. Since no consideration is given to the abutting portion, the above-mentioned problem is not solved.

[Problems to be solved by the invention] The purpose of the invention is to reduce the load on the outer peripheral side of the side edge of the square window of the clutch plate that is received from the spring that absorbs torque fluctuations, and to suppress cracks in the square window. The object of the present invention is to provide a clutch device.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the present invention is that a clutch plate and a retaining plate are stacked on both sides of a clutch hub so that they can rotate relative to each other, and coil springs are attached to the clutch hub, clutch plate, and retaining plate. A corner window is provided to support the clutch plate and the retaining plate, and the circumferential edges of the corner windows of the clutch plate and retaining plate are cut and raised from the plate surface to form a guide piece, and an oval-wound spring is supported on the guide piece. The two parts are brought into contact so as to intersect at the radial side portions of the side edges of the square window.

[Operation] Since the spring wound in an elliptical shape is engaged with a guide piece formed by cutting and raising the circumferential edges of the square windows of the clutch plate and the retaining plate, rotation of the spring around the winding axis is prevented. At the same time, the contact portion between the end of the spring and the side edge of the square window of the clutch plate is stably positioned on the radially inward portion of the side edge, so that The tearing stresses that act are reduced.

[Embodiment of the invention] As shown in FIGS. 1 and 2, the clutch device has a spline hole 11 and a flange 1 fitted into the driven shaft.
A clutch plate 6 and a retaining plate 7 are superimposed on both sides of the clutch hub 12 having 2a. clutch plate 6
The holding plate 7 and the retaining plate 7 are connected to each other by a pin 10 on the inner circumferential side and rotate integrally. Relative rotation is possible within the range of . Actually, clutch hub 12
An annular friction material 14 is interposed between the clutch plate 6 and the clutch plate 6, and an annular friction material 14 and a disc spring 15 are interposed between the clutch hub 12 and the retaining plate 7. An appropriate play space is maintained between the

The outer peripheral sides of the clutch plate 6 and the retaining plate 7 are overlapped close to the clutch hub 12, and are connected to each other by a pin 16. The pin 16 crosses a cutout groove 17 provided on the outer circumferential side of the clutch hub 12.

A plurality of square windows 21 are provided on the outer circumferential side of the clutch hub 12 to house springs 8, 9 for damping torque fluctuations. Corner windows 26 and 27 corresponding to the corner window 21
(Fig. 4) are also provided on the clutch plate 6 and retaining plate 7, and guide pieces 2
6a and 27a are cut up.

Rivets 5 are installed on the outer peripheral edge of the clutch plate 6.
A plurality of cushioning plates 4 are supported at intervals in the circumferential direction. An annular facing 3 is coupled to both sides of the cushioning plate 4 by rivets 2.

In the illustrated example, the clutch hub 12, the clutch plate 6, and the retaining plate 7 have six square windows 21 and 2, respectively.
6 and 27 are arranged in the circumferential direction. Facing 3
Spring 8,
The torque fluctuation of the engine is attenuated by the deflection of 9.

One end 8a of the springs 8, 9 is attached to the clutch hub 1.
The other end 8a abuts the side edges of the square windows 21 of the clutch plate 6 and the holding plate 7, respectively. The above configuration is similar to the conventional one. The side edges of the square window 27 of the holding plate 7 are not shown.

As shown in FIG. 3, according to the present invention, the spring 8
The contact portion between the end portion 8a and the side edge 26b of the square windows 26, 27 is regulated. Therefore, as shown in FIG. 4, the spring 8 is wound in an oval shape, and the guide piece 26 is
a, 27a so as not to rotate.
The end portion 8a of the spring 8 is configured to abut on the radially inward portion of the side edge (represented by the side edge 26b) of the square windows 21, 26, 27.

According to the present invention, the spring 8 is wound in an oval shape, and the guide pieces 26a, 27a of the clutch plate 6 and the retaining plate 7 are
By engaging with , rotation of the spring 8 about the winding axis inside the square windows 26 and 27 is suppressed.
Furthermore, since the end portion 8a of the spring 8 comes into contact with the radially inward portion of the side edge 26b of the square windows 26, 27, the square window 2
The tear stress acting on the radially outward corners 26c of the corners 6 and 27 (the force that tries to expand the pair of corners 26c in the circumferential direction) is reduced, and cracks from the corners 26c are suppressed. It will be done.

[Effects of the invention] As mentioned above, the invention has a clutch plate and a retaining plate stacked on both sides of the clutch hub so that they can rotate relative to each other,
A square window for supporting a coil spring is provided on the clutch hub, clutch plate, and retaining plate, and the circumferential edges of the square windows of the clutch plate and retaining plate are cut and raised from the plate surface to form a guide piece, and the spring is wound in an oval shape. is supported on the guide piece, and the end of the spring is brought into contact with the side edge of the square window in such a way that it intersects with the radially inward part of the side edge, so although the structure is simple, the rotation of the spring around the winding axis is suppressed. It will be done.

Therefore, the end of the spring is stably abutted against the radially inward portion of the side edge of each corner window of the clutch plate and retaining plate, and thereby the radially outward side of the corner window of the clutch plate and retaining plate is Stress concentration on the corners is avoided, and the problem of cracks occurring at the corners, which are the weakest in strength among square windows, is eliminated, and the durability of the clutch plate and retaining plate is improved.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a clutch device to which the present invention is applied, Fig. 2 is a front view of the same, Fig. 3 is a front view showing essential parts of the clutch device, and Fig. 4 is a side sectional view of the same. . 3: facing, 6: clutch plate, 7: retaining plate, 8: spring, 8a: end, 12: clutch hub, 21, 26, 27: square window.

Claims (1)

[Scope of utility model registration request] A clutch plate and a retaining plate are stacked on both sides of the clutch hub so that they can rotate relative to each other, and square windows are provided on the clutch hub, clutch plate, and retaining plate to support the coil spring.
A guide piece is formed by cutting and raising the circumferential edge of the corner window of the clutch plate and retaining plate from the plate surface, and an elliptically wound spring is supported on the guide piece, and the end of the spring is attached to the side edge of the corner window. A clutch device characterized in that the clutch abuts in an intersecting manner at a radially inward portion.