JP2551904Y2 - Wet multi-plate clutch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet multi-plate clutch used in an automatic transmission of a motor vehicle.

[0002]

2. Description of the Related Art As a wet multi-plate clutch provided in an automatic transmission is used, the friction material of the clutch wears, and if the conditions of use are severe, the friction material of the clutch is burned, and the friction material is reduced. Will be gone. Then, the separate plate made of metal and the core plate come into metal contact with each other, and seizure occurs.

[0003] Heretofore, as a wet clutch device for preventing seizure between a separate plate and a core plate, one described in Japanese Utility Model Laid-Open No. 59-110431 is known.

This device is provided with a stopper for preventing movement of a piston for sliding a separate plate at a predetermined position so that abrasion of the friction material does not advance more than a predetermined amount.

[0005]

However, in the conventional wet-type multi-plate clutch device, the movement of the piston is prevented at a predetermined position so that the wear of the friction material does not advance more than a predetermined amount. Although seizure with the core plate is prevented, when the wear of the friction material has progressed to a predetermined amount, the piston pressing force is not transmitted to both plates due to the movement of the piston, and the clutch device Cannot be concluded.

The present invention has been made in view of the above problem. Normally, the seizure of the clutch is prevented, and in the case of an emergency when the friction material wears to a predetermined amount and the clutch cannot be engaged, the normal operation is performed. It is an object of the present invention to provide a wet-type multi-plate clutch device capable of transmitting a torque by supplying a pressure higher than a clutch pressure and engaging a clutch.

[0007]

Therefore, in the present invention, the stopper is formed so as to be movable by the pressing force of the piston when a pressure oil of a predetermined value or more is supplied to the hydraulic chamber, thereby achieving the above object. .

That is, in the present invention, a clutch drum supported on a first shaft to which a torque is input, a cylinder formed in the clutch drum, and an axially slidably provided in the cylinder. A piston having a hydraulic chamber formed in the cylinder, a plurality of separate plates pressed by the piston moved by pressure oil supplied to the hydraulic chamber, and a plurality of friction materials disposed between the separate plates, And a clutch hub having the core plate and being provided on a second shaft from which torque is output, and an inner peripheral surface of the clutch drum provided in a plate pressing direction of the piston. A wet multi-plate clutch device having a stopper for preventing movement at a predetermined position, wherein the stopper has a pressure higher than a pressure oil normally supplied to the hydraulic chamber. It was formed movably by the pressing force of the piston when the supplied predetermined pressure or more of the hydraulic fluid.

When the stopper is formed to be movable, the stopper is provided so as to be movable in the direction of pressing the piston with respect to the clutch drum, and is elastically supported by an elastic body at a predetermined position for preventing the movement of the piston. And the elastic body may be formed to have an elastic force contracted by a pressing force of the piston when a pressure oil of a predetermined pressure or more is supplied to a hydraulic chamber. In this case, the stopper may be formed by a snap ring, and the elastic body may be formed by a disc spring.

In forming the stopper movably, the stopper itself may be formed of an elastic body which is elastically deformed by a pressing force of the piston when a pressure oil of a predetermined pressure or more is supplied to a hydraulic chamber. . In this case, the stopper may be formed of a wave washer, or the stopper may be formed of an elastic body made of a material other than metal.

[0011]

Normally, when pressure oil is supplied to the hydraulic chamber of the cylinder, the piston moves the cylinder and presses the separate plate. Then, the separate plate and the core plate provided on the clutch hub are pressed against each other, and the torque is transmitted from the first shaft to the second shaft.

Then, as the friction material wears out over time, the stroke of the piston required for fastening increases, but movement beyond a predetermined position is prevented by the stopper. As described above, since the piston does not move indefinitely, the amount of wear of the friction material is suppressed to a predetermined amount or less, the metal contact does not occur between the separate plate and the core plate, and seizure of both can be prevented.

When the wear of the friction material has progressed to a predetermined amount after a lapse of time, the movement of the piston in the pressing direction is restricted, so that the separate plate and the core plate cannot be fastened, and the clutch cannot be fastened. Becomes As described above, when the vehicle cannot travel, the hydraulic oil is supplied to the hydraulic chamber with a pressure equal to or higher than a predetermined pressure. Then, a larger pressing force is generated on the piston than usual, and this pressing force causes the stopper to
The piston moves from a predetermined position where the movement of the piston has been prevented until then. Therefore, the separate plate and the core plate are pressed against each other, and the second plate is moved from the first axis to the second plate.
, And the vehicle can travel.

According to the second and third aspects of the present invention, when a pressure oil of a predetermined pressure or more is supplied to the hydraulic chamber in an emergency, the elastic force of the elastic body can no longer withstand the pressing force of the piston and the stopper is moved. Moving.

Further, in the apparatus according to the fourth, fifth and sixth aspects,
When the pressing force of the piston becomes larger than usual due to the pressure oil which is equal to or more than the predetermined pressure in an emergency, the stopper itself is elastically deformed to allow the piston to move in the pressing direction.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a wet-type multi-plate clutch device according to a first embodiment of the present invention, and FIGS. 2 and 3 are sectional views of main parts of the embodiment device.

As shown in FIG. 1, the wet multi-plate clutch device 4 of the first embodiment is provided between an input shaft 1 for inputting torque and an output shaft 2 for outputting torque. Communication is intermittent. That is, the wet multi-plate clutch device 4 has a clutch drum 5, and the clutch drum 5 is supported by the support 3 located on the outer peripheral side of the output shaft 2.
Is provided rotatably. One end of the clutch drum 5 is a cylinder 6, in which a hydraulic piston 7 is provided.
This hydraulic piston 7 has an outer cylinder 7a on which an O-ring 8 is fitted.
And an inner cylinder 7b fitted with an O-ring 8A.

The hydraulic piston 7 has a cylinder 6
Inside the cylinder, it is slidable in the axial direction, and between the cylinder 6 and the top 7c of the hydraulic piston 7, a hydraulic chamber 9 is provided.
It has become. The two O-rings 8, 8A prevent the pressure oil from leaking from the hydraulic chamber 9. The inner cylinder portion 5b of the clutch drum 5 is provided with a port 11 for communicating the hydraulic chamber 9 with a pressure oil passage 10 provided in the support 3, and a pressure oil supplied from a pressure oil control device (not shown). Is supplied to the hydraulic chamber 9 via the hydraulic passage 10 and the port 11.

A spline 12 is provided on the inner peripheral surface of the drum portion 5a on the open side of the clutch drum 5.
An annular separate plate 13 whose outer peripheral portion is slidable from the spline 12 is provided on the drum portion 5a.
Are provided, and an annular core plate 14 is arranged between the separate plates 13.

A fading material 15 which is a friction material to be frictionally engaged with the separate plate 13 is adhered to both surfaces of the core plate 14.

The inner peripheral side of the core plate 14 is located within the drum 5a of the clutch drum 5.
The clutch hub 16 is spline-fitted to the outer peripheral portion of an outer cylinder 16a of the clutch hub 16 provided concentrically with the clutch hub 16, and the clutch hub 16 is fixed to another cylinder 17 whose base 16b is fixed to the input shaft 1. ing.

On the open end side of the spline 12 of the drum portion 5a of the clutch drum 5, in order to restrict the leftward movement of the separate plate 13 in FIG.
A ring-shaped second stopper 18 is attached.

A push plate 19 having substantially the same shape as the core plate 14 is provided between the right end core plate 14 and the outer cylinder 7a of the hydraulic piston 7. A spring receiver 20 is attached to the open end side of the inner cylindrical portion 5b of the clutch drum 5, and a piston return spring 21 is provided between the spring receiver 20 and the top 7c of the hydraulic piston 7. When the pressure oil in the hydraulic chamber 9 escapes, the return spring 21 pushes the hydraulic piston 6 back to the right in the drawing.

As shown in FIGS. 2 and 3, a first stopper 22 composed of a snap ring is provided on the inner peripheral surface of the cylinder 6 of the clutch drum 5 and near the drum portion 5a. The first stopper 22 prevents movement of the hydraulic piston 7 in the plate pressing direction (left direction in the figure) at a predetermined position, and is provided in an annular groove 23 provided on the inner peripheral surface of the cylinder 6. Are slidably provided in the moving direction of FIG. 1, and are provided in an elastically supported state urged rightward in the figure by a spring 25 constituted by a disc spring. The spring 25 is not deformed by the pressing force when the pressure oil supplied to the hydraulic piston 7 is at a normal pressure, but the elastic force is elastically deformed when the pressure oil becomes higher than a predetermined pressure higher than the normal pressure. Is set.

Next, the operation of the first embodiment will be described.

A) Normal time Normally, when pressure oil is supplied from a hydraulic control device (not shown) to the hydraulic chamber 9 of the cylinder 6 through the hydraulic passage 10 and the port 11, the hydraulic piston 7
The outer cylinder 7a of the piston 7 pushes the push plate 19, being pushed against the urging force of 1. Then, the push plate 19 presses the separate plates 13 attached to the clutch drum 5 and the core plates 14 attached to the clutch hub 16 with each other. Thereby, the wet type multi-plate clutch device 4 is engaged, and the torque is transmitted from the input shaft 1 to the output shaft 2.

When the pressure oil in the hydraulic chamber 9 of the cylinder 6 escapes to the outside, the hydraulic piston 7 is pushed in the direction away from the push plate 19 by the urging force of the piston cylinder spring 21. As a result, the pressing force of the pressing plate 19 is eliminated, so that each of the separate plates 13 and each of the core plates 12 are removed.
And the torque transmission is cut off.

B) Emergency By the way, in the wet-type multi-plate clutch device 4, the fading material 15 of each core plate 14 wears as it is used. As the wear progresses, the hydraulic piston 7 will make an extra stroke corresponding to the wear.

While the wear of each of the fading members 15 is small, the wet multi-plate clutch device 4 is engaged with the hydraulic piston 7 not in contact with the first stopper 22. When it has advanced, the hydraulic piston 7 comes into contact with the stopper 22, where the wear of the fading material 15 stops. Therefore, the wear of the fading material 15 further progresses, and the core plate 1
4 and the separate plate 13 do not make metal contact.

However, the hydraulic piston 7
Finally comes into contact with the stopper 22,
The core plate 14 and the separate plate 13 do not come into pressure contact with each other and cannot be fastened, so that torque cannot be transmitted.

In the case of an emergency in which the clutch cannot be engaged in this manner, in this embodiment, a predetermined emergency operation supplies a hydraulic oil having a higher pressure than normal to the hydraulic chamber 9 from a hydraulic control unit (not shown). Then, the pressing force by the hydraulic piston 7 becomes larger than usual, and when the pressing force larger than usual acts on the first stopper 22 which is preventing the movement of the hydraulic piston 7, the first stopper 22 is elastically supported. The spring 25 that has been contracted moves the first stopper 22, and accordingly, the hydraulic piston 7 also moves to the left in the figure. Therefore, each separate plate 13 and each core plate 14 can be pressed again, and the clutch can be engaged. In addition, such emergency running,
For example, it is performed only for short-distance traveling such as approaching from the center of the road to the shoulder or traveling to a repair shop.

As described above, in the wet-type multi-plate clutch device 4 of the first embodiment, the fading material can be normally prevented while the seizure of the separate plate 14 and the core plate 13 can be prevented. In the case of an emergency in which the traveling of the hydraulic piston 7 becomes impossible due to the progress of wear of the clutch 15, the first stopper 22 temporarily stops the movement of the hydraulic piston 7 to enable the wet multi-plate clutch device 4 to be engaged, thereby enabling traveling. be able to.

Next, a second embodiment will be described.

FIG. 4 is a sectional view showing a main part of a wet-type multi-plate clutch device B according to a second embodiment, in which a wave spring 31 is used as a stopper for preventing the movement of the pressing piston 7 at a predetermined position. . This wave spring 31
Is not deformed by the pressing force of the pressing piston 7 by the normally supplied pressure oil, but is deformed by inputting the pressing force of the pressing piston 7 when the pressing oil is supplied at a predetermined pressure which is higher than the normal pressure. Set to force.

The other configuration is the same as that of the first embodiment, and therefore, the same reference numerals are given and the description is omitted.

In the second embodiment, the hydraulic chamber 9 is normally operated.
If the pressure oil supplied to the spring is normal pressure, the wave spring 31 will not be deformed, so that the hydraulic piston 7 abuts on the wave spring 31 and is prevented from moving. Therefore, the wear of the fading material 15 is limited to a predetermined amount, and the core plate 14 and the separate plate 13 do not come into metallic contact.

Then, in an emergency, when the wear of the fading material 15 has advanced to a predetermined amount and the vehicle cannot travel, when a predetermined amount of pressure oil higher than usual is supplied to the hydraulic chamber 9, the pressing force of the hydraulic piston 7 is reduced. Become big, wave spring 3
1 is deformed, which causes the hydraulic piston 7
Is stopped.

Therefore, the wet multi-plate clutch device 4 can be engaged and the vehicle can run.

As described above, in the wet multi-plate clutch device B of the second embodiment, the stopper itself for preventing the movement of the hydraulic piston 7 is formed by the wave spring 31 which is an elastic body. As in the embodiment, the first
Compared to the case where two members such as the stopper 22 and the spring 25 are used, the number of parts is reduced, the cost can be reduced, and the assembling operation is simplified.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this. For example, as in the first embodiment, the stopper is elastically supported by an elastic body. In this case, the stopper is not limited to the snap ring, and the elastic body is not limited to the disc spring. When the stopper itself is made of an elastic body as in the second embodiment, the stopper is not limited to a wave washer, and another elastic body such as a disc spring may be used. A material may be used.

[0042]

As described above, in the wet-type multi-plate clutch device of the present invention, the stopper for preventing the movement of the piston for engaging the clutch at a predetermined position is applied to the hydraulic chamber at a pressure higher than a predetermined value. The oil pressure is increased by a predetermined pressure which is higher than normal pressure in the hydraulic chamber in an emergency when the friction material wears and the clutch cannot be engaged due to the configuration in which the piston is movable by the pressing force of the piston when oil is supplied. By supplying the oil, the effect that the clutch device can be engaged can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a wet multi-plate clutch device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the apparatus of the first embodiment.

FIG. 3 is an enlarged sectional view showing a main part of the first embodiment device.

FIG. 4 is an enlarged sectional view showing a main part of a wet-type multi-plate clutch device according to a second embodiment of the present invention.

[Description of Signs] 1 Input shaft (first shaft) 2 Output shaft (second shaft) 4 Wet multi-plate clutch device 5 Clutch drum 6 Cylinder 7 Hydraulic piston 9 Hydraulic chamber 13 Separate plate 14 Core plate 15 Fading material ( Friction material) 22 first stopper 25 spring (elastic body) 31 wave washer (stopper)

Claims (6)

(57) [Scope of request for utility model registration] 1. A clutch drum supported on a first shaft to which a torque is input, a cylinder formed in the clutch drum, and provided in the cylinder so as to be slidable in the axial direction. A piston formed with a hydraulic chamber, a plurality of separate plates pressed by the piston moved by pressure oil supplied to the hydraulic chamber, and disposed between the separate plates, and friction materials are provided on both surfaces. A core hub, a clutch hub having the core plate, and being provided on a second shaft from which torque is output, and an inner peripheral surface of the clutch drum, wherein the movement of the piston in the plate pressing direction is performed at a predetermined position. A wet-type multi-plate clutch device provided with a stopper that prevents the hydraulic oil from being supplied to the hydraulic chamber by a pressure oil higher than a predetermined pressure that is higher than a pressure oil normally supplied to the hydraulic chamber. Wet multi-plate clutch device being characterized in that formed movably by the pressing force of the piston when the feed. 2. The stopper is provided so as to be movable in a direction of pressing a piston with respect to a clutch drum,
The elastic body is arranged in an elastically supported state by an elastic body at a predetermined position for preventing movement of the piston, and the elastic body contracts due to a pressing force of the piston when a pressure oil of a predetermined pressure or more is supplied to a hydraulic chamber. The wet-type multi-plate clutch device according to claim 1, wherein the clutch is formed. 3. The wet-type multi-plate clutch device according to claim 2, wherein said stopper is formed by a snap ring, and said elastic body is formed by a disc spring. 4. The stopper according to claim 1, wherein the stopper itself is formed of an elastic body which is elastically deformed by a pressing force of the piston when a pressure oil of a predetermined pressure or more is supplied to a hydraulic chamber. Wet multi-plate clutch device. 5. The wet multi-plate clutch device according to claim 4, wherein said stopper is formed of a wave washer. 6. The wet multi-plate clutch device according to claim 4, wherein said stopper is formed of an elastic body made of a material other than metal.