JPH0625714Y2 - Wet multi-plate clutch - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (1) Field of Industrial Use The present invention provides a plurality of first clutch plates with friction material on one of a clutch outer and a clutch inner that are coaxially arranged so as to be rotatable relative to each other, and to the other. The present invention relates to a wet multi-plate clutch which holds a plurality of second clutch plates without friction material so as to be slidable in the axial direction and non-rotatable relative to each other, and alternately superposes the first and second clutch plates.

(2) Conventional Technology In the conventional wet multi-plate clutch, the surface of the friction material joined to the first clutch plate, that is, the sliding contact surface facing the second clutch plate, is formed flat over the entire surface. Is common.

(3) Problems to be Solved by the Invention However, a fine undulation may occur on the sliding contact surface of the friction material with the second clutch plate at the initial stage of use. In some cases, the transmission torque due to frictional engagement cannot be obtained according to the set value, and the waviness causes judder or the like.

The present invention has been made in view of such circumstances, and improves the initial conformability between the friction material of the first clutch plate and the second clutch plate without the friction material to improve the transmission torque and to increase the judder. It is an object of the present invention to provide a wet multi-plate clutch that prevents the occurrence of such problems.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a plurality of first clutch outers and inner clutches which are coaxially rotatably arranged relative to each other. One clutch plate, and a plurality of second clutch plates without friction material on the other side are held slidably and non-rotatably in the axial direction, respectively, and the first and second clutch plates are alternately superposed. The wet multi-plate clutch is characterized in that a recess is provided on a surface of each of the second clutch plates facing the friction material so as to correct undulations on the surface of the friction material by an opening edge.

(2) Action Since the opening edge of the recess of the second clutch plate is brought into sliding contact with the friction material surface of the first clutch plate, minute undulations on the friction material surface are corrected. The initial compatibility with the clutch plate is improved, the transmission torque is increased, and the occurrence of judder and squeal is avoided.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, the wet hydraulic clutch is
A clutch outer 1 coupled to an input shaft (not shown), a clutch inner 2 coupled to an output shaft (not shown) and relatively rotatably arranged coaxially with the clutch outer 1, and spline-coupled to the clutch outer 1. Input side clutch plate as second clutch plate without friction material 3,
3 and the output side clutch plates 4, 4, 4 as the first clutch plate with the friction material 25 spline-coupled to the clutch inner 2 so as to be alternately superposed with the input side clutch plates 3, 3. And a piston 5 slidably fitted to the clutch outer 1 in order to exert a pressing force in a direction to bring the clutch plates 3 and 4 into frictional contact with each other.

The clutch outer 1 includes an outer tubular portion 6, an inner tubular portion 7 coaxially arranged in the outer tubular portion 6, and a connecting plate portion 8 that connects the outer tubular portion 6 and one axial end of the inner tubular portion 7. And an input shaft (not shown) is spline-coupled to the inner cylinder portion 7. Input side clutch plate 3
Is formed in an annular shape surrounding the clutch inner 2, and the outer circumference of each input side clutch plate 3 is coupled to the inner circumference of the outer cylinder portion 6 of the clutch outer 1 via a spline 9. Moreover, as shown in FIG. 2, each input side clutch plate 3 is provided with circular through holes 10 as recesses at a plurality of positions spaced in the circumferential direction. Further, the outer cylinder portion 6
A retaining ring 11 is fitted on the inner surface near the other end of the pressure receiving plate 12 whose outward movement is restricted by the retaining ring 11.
Are coupled to the inner circumference of the outer tubular portion 6 via splines 9.

An annular recess 13 bulging outward is provided near the center of the connecting plate 8 in the clutch outer 1, and the piston 5 is slidably fitted in the recess 13. That is, the piston 5 is connected to the connecting plate portion 8 in the annular hydraulic chamber 14
And the annular seal members 15 and 16 are slidably fitted into the recess 13 and slidably contact the outer peripheral surface of the recess 13 in the piston 5. Moreover, in the piston 5,
A flange portion 5a that projects outward in the radial direction is integrally provided. An annular pressing plate 17 is brought into contact with the collar portion 5a, and the outer periphery of the pressing plate 17 is connected to the inner periphery of the outer tubular portion 6 via the spline 9.

A retaining ring 18 is fitted on the outer surface of the clutch outer 1 near the other end of the inner cylindrical portion 7, and the piston 5 is interposed between the retaining ring 18 and the piston 5 in a direction of contracting the hydraulic chamber 14. A biasing spring 19 is interposed. Further, in order to connect the hydraulic chamber 14 to a hydraulic pressure supply source (not shown) via an oil passage (not shown) provided in the input shaft, the inner cylindrical portion 7
A hydraulic port 20 communicating with the hydraulic chamber 14 is bored at one end of the.

In the clutch inner 2, an intermediate portion of a large diameter cylindrical portion 21 having an outer surface facing the inner surface of the outer cylindrical portion 6 of the clutch outer 1 and one end portion of the small diameter cylindrical portion 22 are connected via a connecting plate portion 23. The output shaft (not shown) is spline-coupled to the inner surface of the small-diameter cylindrical portion 22.

The output side clutch plates 4 and 4 are formed in an annular shape having an outer diameter slightly smaller than the inner diameter of the outer cylindrical portion 6 of the clutch outer 1, and are formed on the outer surface of the large diameter cylindrical portion 21 of the clutch inner 2. It is connected via a spline 24.
Moreover, friction materials 25 are attached to both surfaces of each output side clutch plate 4 so as to frictionally engage with each input side clutch plate 3, pressure receiving plate 12 and pressing plate 17.

Next, the operation of this embodiment will be described. The hydraulic chamber 14
When hydraulic pressure is supplied to the piston 5, the piston 5 moves to the left side in FIG. 1 against the spring force of the spring 19. By this movement of the piston 5, each output side clutch plate 4 is pinched between the pressing plate 17, the input side clutch plate 3 and the pressure receiving plate 12 and frictionally engaged,
Clutch outer 1 from the input shaft to clutch inner 2
That is, power is transmitted to the output shaft.

When the hydraulic pressure in the hydraulic chamber 14 is released, the piston 5 moves in the direction of contracting the volume of the hydraulic chamber 14 by the spring force of the spring 19, the friction engagement state is released, and the power from the input shaft to the output shaft is released. Transmission is cut off.

By the way, since a plurality of through holes 10 are formed in the input side clutch plate 3, even if a slight undulation is generated in the friction material 25 at the initial stage of use, each through hole 10 at the time of friction engagement.
The undulations are corrected by the opening edge of, and the initial conformability between the input side clutch plate 3 and the friction material 25 is improved. That is, when the conventional transmission capacity characteristic is shown by the broken line in FIG. 3, the wet clutch according to the present invention can obtain the characteristic shown by the solid line, and the initial conformability is improved as shown by the A part. The transmission capacity becomes large, and the transmission capacity can be increased as shown in the section B even after long-term use, and the occurrence of judder and squeal due to the undulation can be prevented.

In the above embodiment, the pressure receiving plate 12 and the pressing plate 17 are not provided with the through holes 10 as recesses.
Reference numerals 2 and 17 also function as friction engagement plates, and the through holes 10 may be formed in each. The recess in the present invention may be not only the through hole 10 but also a bottomed recess.

C. As described above, according to the present invention, one of the clutch outer and the clutch inner has a plurality of first clutch plates with friction material, and the other has a plurality of second clutch plates without friction material. In a wet multi-plate clutch that is held slidably in a direction and cannot rotate relative to each other, a recess for correcting the waviness of the friction material surface by an opening edge is formed on the surface of each second clutch plate facing the friction material. Since it is provided, even if there is a slight undulation on the friction material surface of the first clutch plate, the opening edge of the conventional recess of the second clutch plate makes sliding contact with the friction material surface, so that the undulation of the friction material surface is effective. Can be modified to
Therefore, the initial conformability between the surface of the friction material and the second clutch plate can be improved, which can contribute to an increase in the transmission torque and can avoid the occurrence of judder and squeal.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a hydraulic clutch, FIG. 2 is a partial plan view of an input side clutch plate as a second clutch plate, and FIG. 3 is a transmission capacity. It is a characteristic diagram which shows a characteristic in comparison with a conventional thing. DESCRIPTION OF SYMBOLS 1 ... Clutch outer, 2 ... Clutch inner, 3 ... Input side clutch plate as a 2nd clutch plate, 4 ... Output side clutch plate as a 1st clutch plate, 10 ... Through hole as a recess, 25 ... Friction material

Claims (1)

[Scope of utility model registration request] 1. A plurality of first clutch plates (4) having a friction material (25) on one of a clutch outer (1) and a clutch inner (2) coaxially arranged so as to be rotatable relative to each other.
And a plurality of second clutch plates (3) having no friction material on the other side so as to be slidable in the axial direction and non-rotatable relative to each other.
In a wet multi-plate clutch obtained by alternately polymerizing 3), the friction material (2) of each of the second clutch plates (3) is
A wet multi-plate clutch, characterized in that a recess (10) for correcting the undulation of the surface of the friction material (25) by an opening edge is provided on the surface opposite to (5).