JP3497014B2 - Automatic transmission clutch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch of an automatic transmission mainly used for transmission control of driving force of a vehicle.

[0002]

2. Description of the Related Art Conventional clutches for automatic transmissions of this type are known as shown in FIGS. 2 and 3, for example.

In such a clutch of an automatic transmission, a reverse clutch 3 and a high clutch 4 are provided in the transmission case 2 of the automatic transmission 1 side by side in the axial direction.

The reverse clutch 3 includes a multi-plate clutch plate 6 in a cylindrical reverse clutch drum 5.
And a clutch piston 7 for pressing the multi-plate clutch plate 6 in the stacking direction by the inflow of operating pressure.

Of these, the multi-plate clutch plate 6 includes
A plurality of ring-shaped drive plates 8 ... And a plurality of driven plates 9 ... Are alternately laminated. The drive plates 8 are arranged on the high clutch drum 10 of the high clutch 4 and the driven plates 9 are arranged on the inner side of the reverse clutch drum 5, respectively, and are locked by the snap ring 13.

The high clutch 4 includes a multi-plate clutch plate 11 in the cylindrical high clutch drum 10, and a clutch piston 12 for pressing the multi-plate clutch plate 11 in the stacking direction by the flow of operating pressure. And are provided.

The reverse clutch 3 is engaged and disengaged by pressing the multi-plate clutch plate 6 in the stacking direction with the clutch piston 7.

[0008] As another type of this type, there is known one such as described in JP-A-62-288753.

[0009]

However, in such a conventional automatic transmission clutch, the ring-shaped drive plates 8 ... And the driven plates 9 ... Of the multi-plate clutch plate 6 have the same width in the radial direction. Is formed.

Further, it is difficult to greatly change the position and shape of the multi-plate clutch plate 11 and the clutch piston 12 in the high clutch 4 in order to secure the clutch capacity of the high clutch 4.

For this reason, even if the drive plates 8 and the driven plates 9 of the multi-plate clutch plate 6 are further expanded in order to increase the clutch capacity, other components such as the high clutch 4 are provided. Then, unless the outer circumference of the high clutch drum 10 interferes and the total length is extended, the drive plates 8 and the driven plates 9 cannot be increased more than a certain number.

Further, expanding the widths of the drive plates 8 ... And the driven plates 9 ... In the radial direction increases the diameter of the reverse clutch drum 5 and invites an increase in the size of the transmission case 2 as a whole. There was a risk of leaving.

Therefore, the present invention is to provide a clutch for an automatic transmission capable of increasing the clutch capacity by effectively utilizing a space with a large margin and increasing the connection area of the multi-plate clutch plate. It is an issue.

[0014]

In order to achieve such a subject, the invention described in claim 1 of the present invention has a convex portion.
A clutch for an automatic transmission that engages and disengages by pressing a multi-plate clutch plate including a plurality of ring-shaped drive plates and driven plates provided on a drum in a stacking direction with a clutch piston. A pressing force transmission member is attached to the plate clutch plate.
Radial width through is characterized by clutch of an automatic transmission provided with a different drive plate or driven plate.

According to the second aspect,
The pressing force transmitting member is a step for avoiding contact with the convex portion.
A clutch for an automatic transmission according to claim 1, which has a portion .

According to another aspect of the present invention, the multi-plate clutch plate has a piston plate that has substantially the same area as the clutch plate on the clutch piston side and is in contact with the clutch plate on the clutch piston side. A side pressure receiving surface and an opposite pressure receiving surface that has substantially the same area as the clutch plate on the opposite side of the clutch piston and contacts the clutch plate on the opposite side of the clutch piston.
The stepped portion with the piston side pressure receiving surface and the opposite side.
The clutch of the automatic transmission according to claim 2, wherein the pressing force transmission member formed between the opposite pressure receiving surface is provided.

[0017]

[Operation] According to the claim 1 having such a configuration,
The pressing force transmitting member is a clutch on the clutch piston side.
Pressing force input from the touch plate to the pressure receiving surface on the piston side
The clutch plate on the opposite side of the clutch piston
To the opposite pressure receiving surface effectively. For this reason,
On the clutch plate opposite the clutch piston
Engagement and disengagement of the clutch is done on the clutch piston side.
Almost the same as the clutch plate, the additional clutch
Touch capacity can be effectively acted on. Further, since the multi-plate clutch plate is provided with drive plates or driven plates having different radial widths, the drive plates or driven plates having different radial widths may cause interference of the drum.
It is possible to add more by avoiding convex parts .

Therefore, the clutch capacity can be increased without increasing the size of the entire automatic transmission.

Further, according to the second aspect,
Since the stepped portion avoids contact with the other members,
Transmission is not interrupted.

[0020]

[0021]

[0022]

And, in the third aspect,
A pressing force transmission member effectively transmits the pressing force input from the clutch plate on the clutch piston side to the piston side pressure receiving surface to the clutch plate on the opposite side of the clutch piston from the opposite pressure receiving surface.

Therefore, the engagement and disengagement of the clutch on the clutch plate on the side opposite to the clutch piston is performed in substantially the same manner as on the clutch plate on the side of the clutch piston, and the increased clutch capacity is effectively applied. Can be done.

Further, the stepped portion extends over the piston side pressure receiving surface.
Since it is formed between the pressure receiving surface and the pressure receiving surface on the opposite side, it exerts a practically useful effect that transmission of the pressing force is not hindered.

[0026]

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

FIG. 1 shows an embodiment of the present invention. The same or equivalent parts as those of the clutch of the conventional automatic transmission will be described with the same reference numerals.

First, the structure will be described. In the clutch of the automatic transmission of this embodiment, the reverse clutch 14 and the high clutch 4 are provided side by side in the axial direction in the transmission case of the automatic transmission.

The reverse clutch 14 is provided with a multi-plate clutch plate 6 and a clutch piston 7 for pressing the multi-plate clutch plate 6 in the stacking direction by the inflow of operating pressure in a cylindrical reverse clutch drum 5. Has been.

This clutch piston 7 is a retainer 7a.
By the elastic force of the return spring 7b whose other end is supported by, the clutch piston 7 is urged in the releasing direction along the stacking direction.

Of these, the multi-plate clutch plate 6 includes
A plurality of ring-shaped drive plates 8 ... And a plurality of driven plates 9 ... Are alternately laminated.

The drive plates 8 ... And the driven plates 9 ... Have a predetermined width in the radial direction.

The drive plates 8 are arranged on the high clutch drum 10 of the high clutch 4, and the driven plates 9 are arranged on the inner side of the reverse clutch drum 5.

A pressing force transmitting member 15 is provided on the end surface of the drive plate 8 ...
The drive plates 16 ... And the driven plates 17 ...

Of these, the drive plates 16 ... Are used as the high clutch drum 10 of the high clutch 4, and the driven plates 17 are used as the reverse clutch drum 5.
Each of them is arranged inside and is locked by the snap ring 13.

The drive plates 16 ... And the driven plates 17 ... Have different radial widths from the drive plates 8 ... And the driven plates 9 ... The width in the direction is set to be narrow.

Moreover, in this embodiment, the outer diameters of the drive plates 16 ... And the driven plates 17 ... Are formed to be substantially the same as the outer diameters of the drive plates 8 ... Further, the pressing force transmitting member 15 has substantially the same area as the driven plate 9 on the clutch piston 7 side, and has a piston side pressure receiving surface 15a that contacts the drive plate 8 on the clutch piston 7 side, and the clutch piston. 7 has a substantially same area as the driven plate 17 on the opposite side, and the opposite pressure receiving surface 15b that contacts the drive plate 16 on the opposite side of the clutch piston 7, and the piston side receiving surface 15a and the opposite pressure receiving surface 15b. And a stepped portion 15c which is formed between the high clutch 4 and the clutch piston 12 of the high clutch 4, which is the other member, to avoid contact with the convex portion 10a of the high clutch drum 10. .

Further, in the high clutch 4, a multi-plate clutch plate 11 is provided in the cylindrical high clutch drum 10, and a clutch piston 12 for pressing the multi-plate clutch plate 11 in the stacking direction by the flow of operating pressure. And are provided. In this embodiment, the multi-plate clutch plate 11 is composed of a drive plate 11a ... And a driven plate 11b. Of these, the radial distance from the ring center to the outer edge of each drive plate 11a. The distance from the center of the ring to the inner edge of each of the driven plates 17 ...

Next, the operation of this embodiment will be described.

The multi-plate clutch plate is the drive plate 8 or the driven plate 9 which has been conventionally used.
In addition to the above, a drive plate 16 and a driven plate 17 having different radial widths are further provided.

With the drive plate 16 and the driven plate 17 having different radial widths, it is possible to avoid the convex portion 10a of the high clutch drum 10 where interference is expected and to add more.

Therefore, the clutch capacity of the reverse clutch 14 can be increased without increasing the size of the entire automatic transmission.

Further, since the clutch piston 12 disposed inside the high clutch drum 10 has to contact the end face with the multi-plate clutch plate 11 having a predetermined clutch capacity, the high clutch drum 10 projects in the radial direction. A convex portion 10 a is formed on the outer peripheral surface of the high clutch drum 10.

Among the multi-plate clutch plates, the narrow drive plates 16 and the driven plates 17 are provided along the outer peripheral surface of the convex portion 10a.

Therefore, even for a member such as the high clutch 4 whose shape and size are difficult to change to secure the clutch capacity, the drive plate 16 ... And the driven plate having the narrow width along the outer peripheral surface. By arranging the high clutch 4 so that 17 are positioned, the clutch capacity of the reverse clutch 4 can be increased without increasing the widths of the drive plates 8 and the driven plates 9 that have been conventionally used in the radial direction. Can be increased.

Moreover, since it is not necessary to further extend and stack the drive plates 8 and the driven plates 9 in the stacking direction, even if the high clutch 4 is provided,
The clutch capacity of the reverse clutch 14 can be increased without increasing the overall length of the automatic transmission in the stacking direction.

Therefore, the clutch capacity can be increased without increasing the size of the entire automatic transmission, and it is not necessary to change the shape and size of the transmission case (not shown) from those used conventionally. It is possible to suppress an increase in manufacturing cost.

Then, the pressing force transmitting member 15 applies the pressing force input from the drive plate 8 which is the clutch plate on the clutch piston 7 side and the driven plate 9 to the piston side pressure receiving surface 15a in the opposite direction of the clutch piston 7. To the drive plate 16 and the driven plate 17 which are clutch plates on the opposite side, and the pressure receiving surface 1 on the opposite side.
Effectively transmitted from 5b.

Therefore, the drive plate 16 on the side opposite to the clutch piston 7 and the driven plate 17 are provided.
For engagement and disengagement of the clutch in ..., the contact between the drive plates 16 and the driven plate 17 secures an effective contact area by a pressing force that acts substantially uniformly, so that the drive plate 8 on the clutch piston 7 side is secured. ... and driven plate 9 ... Therefore, the increased clutch capacity can be effectively operated.

Further, since the step portion 15c avoids contact with the convex portion 10a of the high clutch drum 10, the transmission of the pressing force is not hindered.

In this embodiment, the radial distance from the ring center to the outer end edges of the drive plates 11a is the radial direction from the ring center to the inner end edges of the driven plates 17 ... The drive plates 11a and the driven plates 17 can be co-fabricated from the same material. Therefore, it is possible to further suppress an increase in manufacturing cost.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and the present invention can be applied even if there is a design change or the like without departing from the scope of the invention. include.

For example, in the above embodiment, the drive plate 16 or the driven plate 17 having different radial widths is used.
Although the clutch provided with is used as the reverse clutch 14 for description, the invention is not particularly limited to this, and a multi-plate clutch plate such as a high clutch, a forward clutch, an overrun clutch, or the like can be used. It may be used for a clutch to be used, or a brake using a multi-plate clutch plate such as a low brake and a reverse brake.

When used for a low-and-reverse brake arranged near the rear end of the automatic transmission, etc., the drive plates 8, 16 ... Or the driven plates 9, 1 are used.
The radial distance from the center of the ring of 7 to the outer edge is
It may be gradually shortened as it approaches the rear end, and adapted to the shape of the transmission case 2, the automatic transmission as a whole, or the vehicle body.
6 ... or the shape and size of the driven plates 9, 17 ...
Alternatively, the quantity is not limited by the above embodiment.

[0055]

As described above , according to the first aspect of the present invention, the pressing force transmitting member is
From the clutch plate on the clutch piston side to the piston
The pressing force input to the side pressure receiving surface is applied to the clutch piston
Effective from the pressure receiving surface on the opposite side to the clutch plate on the other side
introduce. Therefore, on the opposite side of the clutch piston
To engage and disengage the clutch on the clutch plate,
Almost the same as the clutch plate on the clutch piston side
To increase the clutch capacity effectively.
You can Also, the multi-plate clutch plate,
Since drive plates or driven plates having different radial widths are provided, the drive plates or driven plates having different radial widths can be added while avoiding the convex portion of the drum where interference is expected. I can.

Therefore, the clutch capacity can be increased without increasing the size of the entire automatic transmission.

Further, according to the second aspect,
Since the stepped portion avoids contact with the other members,
Transmission is not interrupted.

[0058]

[0059]

[0060]

Then, according to the third aspect,
A pressing force transmission member effectively transmits the pressing force input from the clutch plate on the clutch piston side to the piston side pressure receiving surface to the clutch plate on the opposite side of the clutch piston from the opposite pressure receiving surface.

Therefore, the engagement and disengagement of the clutch on the clutch plate on the side opposite to the clutch piston is performed in substantially the same manner as the clutch plate on the side of the clutch piston, and the increased clutch capacity is effectively applied. Can be done.

Further, the stepped portion extends over the pressure receiving surface on the piston side.
Since it is formed between the pressure receiving surface and the pressure receiving surface on the opposite side, it exerts a practically useful effect that transmission of the pressing force is not hindered.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a clutch of an automatic transmission according to an exemplary embodiment of the present invention, illustrating a configuration of a main portion of the automatic transmission, taken along a rotational axis direction.

FIG. 2 is a side view showing a configuration of an automatic transmission showing a clutch of a conventional automatic transmission.

FIG. 3 is a cross-sectional view showing a clutch of an automatic transmission of a conventional example, illustrating a configuration of a main part, at a position along a rotation axis direction of the automatic transmission.

[Explanation of symbols]

7 Clutch piston 8,16 drive plate 9,17 Driven plate 14 Reverse clutch (clutch) 15 Pressing force transmission member 15a Piston side pressure receiving surface 15b Pressure receiving surface on the opposite side 15c step

Claims (3)

(57) [Claims] 1. An automatic transmission that engages and disengages by pressing a multi-plate clutch plate including a plurality of ring-shaped drive plates and driven plates provided on a drum having a convex portion in a stacking direction by a clutch piston. A multi-disc clutch plate via a pressing force transmission member.
Clutch for an automatic transmission radial width is characterized in that a different drive plate or driven plate Te. 2. The pressing force transmitting member is in contact with the convex portion.
2. A step portion for avoiding the above is provided.
Automatic transmission clutch. 3. The multi-plate clutch plate has substantially the same area as the clutch plate on the clutch piston side, and has a piston-side pressure receiving surface that abuts on the clutch plate on the clutch piston side and an opposite side of the clutch piston. Side clutch plate, has substantially the same area, and has an opposite side pressure receiving surface that abuts with a clutch plate on the opposite side of the clutch piston, and the stepped portion includes the piston side pressure receiving surface.
And the pressing force transmitting portion formed between the opposite pressure receiving surface
The material according to claim 2, wherein a material is provided.
Dynamic transmission clutch.