JPH0777222A - Wet multiple disk clutch - Google Patents

Abstract

PURPOSE:To provide a wet multiple disk clutch that is able to uniformize the extent of surface pressure between a driven plate and a clutch disk at the time of clutch engagement and excellent in clutch efficiency, besides compact in size. CONSTITUTION:In a wet multiple disk clutch which is made up of a clutch engaging part 30 consisting of a multiple driven plate 31 and a multiple clutch disk 41, a piston 1 pressing these elements 31 and 41 in contact with each other in time of clutch engagement, and a pressure plate 32 installed in a backside of the clutch engaging part 30 in order to receive connecting pressure in time of the clutch engagement, the piston 1 has an incline projected toward a releasing end 321 of the pressure plate 32 in its pressing surface 11. In this case, the incline may be good even if it is curved form.

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 which connects a driven plate and a clutch disc by a piston, and more particularly to the shape of a pressing surface of the piston.

[0002]

2. Description of the Related Art A wet multi-plate clutch is, as shown in FIG.
The outer peripheral drum 3 and the inner drum 4, the shaft 5 through which they are inserted, the clutch connecting portion 30 provided between the outer peripheral drum 3 and the inner drum 4, and the clutch connecting portion 30.
And a piston 9 for pressing the driven plate inside. As will be described later with reference to FIG. 1, a multi-plate driven plate and a multi-plate clutch disk are alternately arranged in the clutch connecting portion 30 so as to face each other. Is connected to the inner drum 4 (for details, see the description of the embodiments below).

In connecting the clutch, the piston 9 is hydraulically operated so that the pressing surface 91 is pressed against the driven plate of the clutch connecting portion to bring the driven plate and the clutch disc into surface contact. As a result, the outer peripheral drum 3 and the inner drum 4 rotate integrally, and, for example, the driving force of the outer peripheral drum 3 is transmitted to the inner drum 4 side via the driven plate and the clutch disc.

When the clutch is engaged, the driven plate and the clutch disc are pressed by the piston 9. Therefore, in order to receive the connection pressure,
A pressure plate 32 is provided behind the clutch connecting portion 30.
Is provided. The pressure plate 32 is fixed to either an outer peripheral drum provided with a driven plate or an inner drum.

[0005]

[Problems to be Solved] However, the conventional wet multi-plate clutch has the following problems. That is, when the clutch is connected, the piston 9 applies a strong connection pressure to the pressure plate 32 as described above. Therefore, the release end side 321 of the pressure plate 32 bends backward.

As a result, the surface pressure between the driven plate and the clutch disc becomes uneven. That is, the surface pressure is in the direction of the release end side 321 of the pressure plate (see FIG. 6).
In the case of, the pressure decreases on the inner peripheral side, that is, in the direction of the shaft 5, and the surface pressure increases on the opposite side. Such non-uniformity of the surface pressure causes uneven wear of the clutch and a reduction in transmission efficiency.

On the other hand, it is conceivable to increase the rigidity of the pressure plate 32 in order to prevent the pressure plate 32 from bending backward, but in this case, the plate thickness of the pressure plate becomes large, and the wet multi-plate clutch as a whole. Becomes larger. In view of such conventional problems, the present invention can make the surface pressure between the driven plate and the clutch disc uniform when the clutch is connected, is compact, does not cause uneven wear, and has excellent transmission efficiency. It is intended to provide a plate clutch.

[0008]

According to the present invention, there is provided an outer peripheral drum, an inner drum, a shaft through which these drums are inserted, and a multi-plate driven plate provided on either the outer peripheral drum or the inner drum and alternately facing each other. And a piston for pressing the clutch connecting portion, and a pressure plate for receiving a connecting pressure when the clutch is connected is provided on the back surface of the clutch connecting portion. In a wet multi-plate clutch configured to hydraulically actuate the piston and press the pressing surface against the clutch connecting portion to connect the driven plate and the clutch disc, the piston has the pressing surface. And a wet multi-plate cylinder having an inclined surface protruding toward the open end side of the pressure plate. In the pitch.

What is most noticeable in the present invention is that the pressing surface of the piston is provided with an inclined surface projecting toward the release end side of the pressure plate. Further, contrary to the above, there is also a means of providing an inclined surface projecting toward the clutch connecting portion on the release end side of the pressure receiving surface of the pressure plate. That is,
The inclined surface is provided on either the piston or the pressure plate.

The angle of the inclined surface is preferably 0.1 to 3 degrees with respect to the surface orthogonal to the shaft (FIG. 2).
reference). If it is less than 0.1 degrees, it is difficult to achieve the object of the present invention. On the other hand, if it exceeds 3 degrees, the plate may be plastically deformed.

The inclined surface is a flat surface (FIGS. 2 and 5).
The shape is not limited to the above and may be a curved shape (FIG. 3). Even in the case of a curved shape, it is necessary to project toward the release end side of the pressure plate as described above (Fig. 3). In the case of a curved shape, the above-mentioned inclined surface gradually contacts the driven plate when the clutch is connected, so that the clutch connection becomes smooth.

[0012]

In the wet multi-plate clutch according to the present invention, the piston has an inclined surface on its pressing surface which projects toward the release end side of the pressure plate. Then, when the pressing surface of the piston is pressed toward the clutch connecting portion when the clutch is connected, the connection pressure causes the release end side of the pressure plate to bend rearward.

However, in the present invention, since the pressing surface of the piston has the inclined surface which projects toward the release end side, the protruding portion of the inclined surface is as much as the bending amount of the pressure plate. Press the driven plate and clutch disc toward the release end of the pressure plate. Therefore, when the clutch is connected, the driven plate and the clutch disc are clutch-connected with a uniform surface pressure in all parts. Therefore, uneven wear can be prevented and transmission efficiency can be improved.

Further, when the inclined surface is provided on the pressure plate side, as described above, when the piston is pressed, the connection pressure causes the release end side of the pressure plate to slightly bend rearward, but the inclination of the pressure receiving surface. The protruding portion of the surface covers the amount of bending of the pressure plate. Therefore, the pressure receiving surface of the pressure plate is kept parallel to the clutch connecting portion, and the contact state of the clutch disc is kept uniform. Therefore, as described above, the driven plate and the clutch disc are clutch-connected with a uniform surface pressure as in the case where the inclined surface is provided on the piston,
Uneven wear can be prevented and transmission efficiency can be improved.

Therefore, in order to improve the rigidity of the pressure plate, it is not necessary to increase the plate thickness, and the entire size can be reduced as it is. As mentioned above,
ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide a wet multi-plate clutch that can make the surface pressure between the driven plate and the clutch disc uniform when the clutch is engaged, is small, and does not cause uneven wear and is excellent in transmission efficiency. You can

[0016]

【Example】

Example 1 A wet multi-plate clutch according to an example of the present invention will be described with reference to FIGS. The wet multi-plate clutch of this example is
It has an outer peripheral drum 3, an inner drum 4, a shaft 5 through which they are inserted, a multi-plate driven plate 31 provided on the outer drum 3, and a multi-plate clutch disc 41 provided on the inner drum 4. The multi-plate driven plate 31 and the clutch disc 41 are alternately arranged so as to face each other, and constitute the clutch connecting portion 30 (FIG. 2).

In FIG. 1, the driven plate 31 described above is used.
A piston 1 is arranged between the outer peripheral drum 3 and the outer peripheral drum 3, and a pressure plate 32 for receiving connection pressure for clutch connection is provided on the back surface of the clutch connection portion 30. The pressure plate 32 is fixed to the outer peripheral drum 3 similarly to the driven plate 31, and the open end side 321 thereof faces the shaft 5 (inner peripheral direction). As shown in the enlarged view of FIG. 2, the piston 1 has a pressing surface 11 on the release end side 32 of the pressure plate 32.
It has an inclined surface protruding toward 1.

This will be described in detail below. As shown in FIG. 1, the outer peripheral drum 3 and the inner drum 4 are inserted into a shaft 5 with a piston 1 interposed therebetween.
The outer peripheral drum 3 is fixed to the shaft 5. A spline is cut inside the ring portion 35 of the outer peripheral drum 3, and a multi-plate driven plate 31 is slidably fitted therein.

The driven plates 31 are arranged in parallel in the direction of the shaft 5, that is, in the inner peripheral direction. Also,
At the rear end of the ring portion 35, a pressure plate 32 is fixed behind the rearmost driven plate 41. The release end side 321 of the pressure plate 32 is
It faces the inner circumference.

On the other hand, the inner drum 4 is relatively rotatably coupled to the shaft 5 via a bearing 46 or a bush. Also, the inner ring 4 of the inner drum 4
5, a spline is cut, and a multi-plate clutch disc 41 is slidably fitted therein.

Next, the outer peripheral drum 3 and the piston 1 are fitted together via the piston ring 14, and the hydraulic passage 51
When high hydraulic pressure is supplied from the
It is configured so that it can slide inward and move toward the driven plate 41. The piston 1 is slidably inserted in the shaft 5. The piston 1 is normally urged by the return spring 15 toward the outer peripheral drum 3. A friction material is adhered to the surface of the clutch disc 41. Driven plate 31
Is a steel plate. The shaft 5 has bearings 52, 5
It is supported by 3.

The pressing surface 11 of the piston 1 faces the clutch connecting portion 30 as shown in FIGS.
Further, the pressure plate 32 has an inclined surface projecting toward the release end side 321. Angle α of this inclined surface (Fig. 2)
Is about 0.1 to 3 degrees. The angle α is an angle with respect to a plane orthogonal to the shaft 5. The inclined surface of this example is planar.

Next, the function and effect of this example will be described. In this example, the driving force is transmitted from the engine to the outer peripheral drum 3 via the crankshaft and the gear, and the outer peripheral drum 3 is rotating. Therefore, in order to transmit this rotational force to the inner drum 4, a clutch connection is made.

When the clutch is engaged, high pressure oil is supplied from the hydraulic passage 51. Therefore, this hydraulic pressure pushes the piston 1 toward the clutch connecting portion 30, and the pressing surface 11 of the piston presses the driven plate 41 at the left end of the clutch connecting portion 30. Therefore, the multi-plate driven plate 31 and the multi-plate clutch disc 41 are in pressure contact with each other, and the clutch is connected. Therefore, the outer peripheral drum 3 and the inner drum 4 rotate integrally, and the driving force is transmitted to the inner drum 4.

It should be noted here that the clutch 1 is connected to the clutch 1 by the connection pressure of the piston 1.
The release end side 321 of the pressure plate 32 bends backward. However, in this example, the pressing surface 1 of the piston is
Since 1 has the above-mentioned inclined surface, the protruding portion of the inclined surface presses the driven plate 31 and the clutch disc 41 toward the release end side 321 of the pressure plate 32 by the amount of deflection of the pressure plate.

Therefore, the driven plate 31 and the clutch disc 41 in the clutch connecting portion 30 are clutch-connected with a uniform surface pressure in all parts. Therefore, it is possible to prevent uneven wear and improve the transmission efficiency. Also, therefore, in order to improve the rigidity of the pressure plate, the pressure plate 3
It is not necessary to increase the plate thickness of No. 2 and the entire wet multi-plate clutch can be made compact.

Embodiment 2 In this embodiment, as shown in FIG. 3, the pressing surface 11 of the piston 1 is
Is an example of a curved line. The pressing surface 11 projects toward the release end side 321 of the pressure plate 32. Others are the same as in the first embodiment. In this example, since the inclined surface of the pressing surface is curved, the pressing surface 11 of the piston 1 gradually contacts the driven plate 31. Therefore, the clutch connection becomes smooth. Other,
Also in this example, the same effect as that of the first embodiment can be obtained.

Embodiment 3 This embodiment is an example in which a pressure plate 32 is provided on the inner peripheral ring 45 of the inner drum 4 as shown in FIG. A driven plate 31 is provided on the inner ring. On the other hand, the outer peripheral drum 3 is provided with a clutch disc 41. That is, in the first embodiment, the driven plate 31, the pressure plate 32, the clutch disc 41, and the mounting portion are changed to the inner drum 4 and the outer peripheral drum 3.

The pressing surface 11 of the piston 1 is the release end side 3 of the pressure plate 32 provided on the inner drum 4.
It has an inclined surface projecting toward 21. That is, the inclined surface of the pressing surface 11 projects in the direction opposite to the shaft, that is, toward the outer circumference. Also in this example, the same effect as that of the first embodiment can be obtained.

Embodiment 4 In this embodiment, as shown in FIG. 5, the pressure plate 32 is provided with an inclined surface of an angle β projecting toward the clutch connecting portion 30 on the release end side 321 of the pressure receiving surface 323 thereof. is there. The inclined surface is flat. On the other hand, the pressing surface 15 of the piston 1 facing the clutch connecting portion 30 is a vertical flat surface as in the conventional example. Others are the same as in the first embodiment.

In this example, when the clutch is engaged, the pressing surface 15 of the piston 1 first presses the clutch connecting portion 30. Due to the pressing force, the release end side 321 of the pressure plate 32 is slightly bent rearward, but the protruding portion of the inclined surface of the pressure receiving surface 323 covers the amount of bending of the pressure plate 32.

Therefore, the pressure receiving surface 323 of the pressure plate 32 is kept in parallel with the clutch connecting portion 30, and the contact state of the clutch disc is kept uniform. Therefore,
Similar to the first embodiment, the driven plate and the clutch disc are clutch-connected with a uniform surface pressure. Therefore, it is possible to prevent uneven wear and improve the transmission efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire wet multi-plate clutch according to a first embodiment.

FIG. 2 is an explanatory diagram around a piston according to the first embodiment.

FIG. 3 is an explanatory diagram around a piston according to a second embodiment.

FIG. 4 is an explanatory diagram around a piston according to a third embodiment.

FIG. 5 is an explanatory diagram around a piston according to a fourth embodiment.

FIG. 6 is an explanatory view of the vicinity of a piston in a conventional wet multi-plate clutch.

[Explanation of symbols]

 1. ． ． Piston, 11. ． ． Pressing surface, 3. ． ． Peripheral drum, 30. ． ． Clutch connection, 31. ． ． Driven plate, 32. ． ． Pressure plate, 323. ． ． Pressure receiving surface, 4. ． ． Inner drum, 41. ． ． Clutch disc, 5. ． ． shaft,

Claims (4)

[Claims] 1. An outer peripheral drum, an inner drum, a shaft through which they are inserted, and a multi-plate driven plate and a multi-plate formed on one of the outer peripheral drum and the inner drum, which are alternately opposed to each other. The piston has a clutch connecting portion composed of a clutch disc and a piston for pressing the clutch connecting portion, and a pressure plate for receiving a connecting pressure when the clutch is connected is provided on the back surface of the clutch connecting portion. In a wet multi-plate clutch configured to hydraulically actuate the pressing surface against the clutch connecting portion to connect the driven plate and the clutch disc, the piston has the pressing plate on the pressing surface. A wet multi-plate clutch having an inclined surface protruding toward the release end side of the. 2. An outer peripheral drum, an inner drum, a shaft through which they are inserted, and a multi-plate driven plate and a multi-plate formed on one of the outer peripheral drum and the inner drum and facing each other alternately. The piston has a clutch connecting portion composed of a clutch disc and a piston for pressing the clutch connecting portion, and a pressure plate for receiving a connecting pressure when the clutch is connected is provided on the back surface of the clutch connecting portion. In a wet multi-plate clutch configured to hydraulically actuate the pressing surface against the clutch connecting portion to connect the driven plate and the clutch disc, the pressure plate has a pressure receiving surface on the release end side. The wet multi-plate clutch is characterized in that it has an inclined surface protruding toward the clutch connecting portion. Ji. 3. The wet multi-plate clutch according to claim 1, wherein the inclined surface is 0.1 to 3 degrees. 4. The wet multi-plate clutch according to claim 1, wherein the inclined surface has a curved shape.