JP2002147491A - Wet type multiple disk clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet type multiple disk clutch capable of suppressing generation of a heat spot in a separator plate. SOLUTION: This wet type multiple disk clutch 1 has a clutch case 2, a hub 3, friction plates 5, a piston 6, a return spring 7, the separator plates 11 or the like, as shown in Figure for showing one embodiment. The friction plate 5 is spline-fitted in a spline part 31 of the hub 3, while the separator plate 11 is spline-fitted in a spline part 21 of the clutch case 2. By bring the friction plates 5 into pressure-contact with the separator plates 11 by the piston 6, motive power is transmitted to the clutch case 2 from the hub 3. The number of the separator plates 11 disposed between the adjacent friction plates 5 is plural (two in the embodiment shown in Figure), and a thickness of the separator plate 11 is set to 1.26 mm. Thereby, the generation of the heat spot is suppressed. In addition to the embodiment shown in Figure, two to five separator plates 11 each having a thickness of 0.5-1.52 mm can have a similar effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet type multi-plate clutch mainly used for an automobile transmission.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a basic structure of a wet-type multi-plate clutch. A wet-type multi-plate clutch 1 includes a clutch case 2 and a hub 3 which rotate relative to each other. And the separator plate 11 is provided in the clutch case 2,
A plurality of friction plates 5 are attached to the hub 3 so as to be movable in the axial direction by fitting a plurality of friction plates. In the illustrated conventional example, the separator plates 11 and the free cushion plates 5 are alternately arranged one by one.

[0003] The motive power is transmitted between the clutch case 2 and the hub 3 via the clutch 1. Reference numeral 21 denotes a spline portion of the clutch case 2, and reference numeral 31 denotes a spline portion of the hub 3. 6 is a piston, and 7 is a return spring of the piston 6.

To transmit power, if a pressure is applied to the right side of the piston 6 in the figure, the piston 6 moves to the left against the spring 7 to press the friction plate 5 and the separator plate 11 against each other. To the clutch case 2. Reference numeral 22 denotes a retaining ring for supporting the piston. If the pressure on the right side of the piston 6 is released, the piston 6
Is returned to the right by the return spring 7, and the clutch is released. In the figure, XX represents the center line of the entire apparatus.

[0005]

In the wet multi-plate clutch having the conventional structure, the heat generated when sliding and rotating at high speed is not good, and a heat deformation called a heat spot occurs on the plate. FIG. 5 shows a state after the test of the separator plate 11 of the conventional wet multi-plate clutch. A heat spot 11H is formed on the surface of the separator plate 11. Reference numeral 11A denotes a spline claw that engages with the spline portion 21 of the clutch case 2.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a wet multi-plate clutch in which a plurality of friction plates and separator plates are alternately arranged. A plurality of separator plates were arranged between the plates, and a wet multi-plate plate having a thickness of 0.5 to 1.52 mm was obtained.

Further, the plurality of separator plates are disposed so as to be separated from each other, a thin member is interposed between the plurality of separator plates, or the plurality of separator plates are mutually disposed. The facing surface may be coated or surface treated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The relationship between the thickness of a separator plate and the generated heat spot is considered to be as shown by the following equation.

[0009]

(Equation 1)

However, ΔH: height of the heat spot ΔT: temperature difference on the surface of the separator plate (that is, temperature difference between the heat spot location and other locations) W: thickness of the separator plate α: linear expansion coefficient I do.

That is, the thinner the separator plate, the less heat spots are generated. Further, if the sliding rotation is continued even after the generation of the heat spot, the surface pressure at the heat spot portion becomes higher, so that the temperature is further increased as compared with other portions, so that the heat spot is further increased.

In the embodiment of the present invention, a plurality of separator plates (two to five in the embodiment) are arranged between adjacent friction plates, and the thickness of each separator plate is smaller than that of the conventional one. (The thickness of the conventional plate was about 2.7 mm, but in the embodiment of the present invention, it is 0.5 mm.
1.52 mm. This is because the total heat capacity is made substantially the same and the thickness is set so that the strength of the spline claws of the separator plate engaged with the spline portion of the clutch case can be secured.

Further, a plurality of (two to five in this embodiment) separator plates disposed between the friction plates are disposed so as to be separated from each other. Separable is not only when each separator plate is completely separated and each can move freely, but also thin when it is bonded and fixed with a thin member interposed between the separator plates. This includes a case where it can be minutely moved in the axial direction by the elasticity of the member or the adhesive.

It is considered that the presence of the thin member has the effect of insulating the separator plates, damping vibrations, absorbing shocks, and the like. Here, damping means suppressing the vibration of the separator plate due to the vibration of the power rotation, and means that shock absorption has the function of a cushion between each separator plate. This means that when there are minute irregularities, the surface pressure of the convex portion is absorbed, and the entire separator plate is easily uniformly contacted with the other separator plate.

This thin member is intended to include all thin members such as a thin plate made of rubber, vinyl, resin, or a mixture thereof, and a thin cloth such as a nonwoven fabric, a woven fabric, or a knitted fabric.
Preferred are various papers, sheets, films,
Gaskets and the like.

More specifically, Teflon (registered trademark) sheets, polyimide films, aramid films, fluorine films, thermosetting resin films, polyoxymethylene films, super engineering plastic fiber films, polyethylene sulfide films, polyetherimide films, Examples include a polyetherketone film, a polyethersulfone film, a carbon fiber sheet, a silica fiber sheet, and quartz paper.

It is also considered that the coating has the same function as that of the thin member described above. This coating material is almost the same as the adhesive for bonding the above-mentioned thin members. Specifically, thermosetting resin, engineering plastic, general-purpose resin, polymer alloy, butadiene nitrile rubber, and high elastic resin sheet are used. is there.

The surface treatment includes shot blasting and shot peening, which have a small gap between both separator plates, and have an effect of making it easy to hold the plate with lubricating oil. In addition, these surface treatments can be applied to the case where the above-mentioned thin member is interposed or not.

[0019]

FIG. 1 is a sectional view in the axial direction of a first embodiment of the present invention. The basic structure is the same as that of the prior art shown in FIG.
4 denote the same parts. In the first embodiment shown in FIG. 1, two separator plates are mounted between the friction plates 5 in a free state. The thickness of each separator plate is 1.26 mm. The inner diameter of the plate is 131.4 mm, the outer diameter is 151.7 mm, the friction area is 45.14 cm ² on one side, and the total area is 47.52 cm ² on one side. The dimensions such as the inner and outer diameters and the area are the same in the embodiments described later.

FIG. 2 is a view similar to that of the second embodiment. In this embodiment, a Teflon sheet 12 is interposed between two separator plates 11 having the same thickness of 1.26 mm as in the first embodiment. I have.

FIG. 3 is a front view of the Teflon sheet 12 and the separator plate 11 as viewed from the side A in FIG. 11A
Indicates a spline claw of the separator plate 11.

As a third embodiment, the thickness is set to 0.5
mm, the number of separator plates is five, the thickness is 0.9 mm as the fourth embodiment, and the thickness is 1.4 mm, the number is two as the fifth embodiment when the number is three. In this case, as a sixth embodiment, the thickness is set to 1.52 mm,
When two sheets were used, the generation of heat spots was suppressed.

As described above, in the first to sixth embodiments, the dimensions of the inner diameter of 131.4 mm, the outer diameter of 151.7 mm, the friction area of 45.14 cm ² , and the total area of 47.52 cm ² are the same.

As described above, FIG. 5 shows that a heat spot 11H is generated on the conventional separator plate as a result of the test. FIG. 6 shows the first embodiment, and FIG. 7 shows the second embodiment. This shows that the generation of heat spots is suppressed even after the test results. Third
Also in the sixth to sixth examples, the effect of suppressing the generation of the heat spot was similarly observed.

The test conditions were as follows: cycle number: 2 initial rotation number: 8100 r. p. m Inertia: 0.196 kg · m ² (when an inertia moment is generated by attaching a disc-shaped weight of about 10 kg) Maximum surface pressure: 10 kgf / cm ² Oil temperature at start: 100 ° C Lubrication amount (from shaft center) ): 0.18 l / min Fastening time: about 0.8 seconds

The wet multi-plate clutch of the present invention has the above-described structure, and has an effect of suppressing the generation of a heat spot. Although the friction material of the friction plate may be darkened, the burn is caused by a heat spot generated on the separator plate. Therefore, if the heat spot is suppressed, the friction material can be prevented from being burned.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of the second embodiment.

FIG. 3 is a view showing an arrow A in FIG. 2;

FIG. 4 is a sectional view of a conventional wet multi-plate clutch.

FIG. 5 is a diagram of a conventional separator plate showing test results.

FIG. 6 is a view of a separator plate according to the first embodiment.

FIG. 7 is a view of a separator plate according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wet multi-plate clutch 2 Clutch case 3 Hub 5 Friction plate 6 Piston 7 Return spring 11 Separator plate 11A Spline claw 11H Heat spot 12 Teflon sheet 21 Spline part 22 Retaining ring 31 Spline part

Claims (5)

[Claims] 1. A wet multi-plate clutch in which a plurality of friction plates and separator plates are alternately arranged, wherein a plurality of separator plates are arranged between adjacently arranged friction plates. A wet multi-plate clutch characterized by the following. 2. The wet-type multi-plate clutch according to claim 1, wherein the plurality of separator plates disposed between the friction plates are disposed so as to be separated from each other. 3. The wet-type multi-plate clutch according to claim 1, wherein a thinner member is interposed between the plurality of separator plates. 4. A coating or surface treatment is applied to surfaces of the plurality of separator plates facing each other, the surfaces being opposed to each other. Wet multi-plate clutch 5. The wet multi-plate clutch according to claim 1, wherein a thickness per one of the separator plates is 0.5 to 1.52 mm.