JPH0613894B2 - Return spring mounting mechanism for automatic transmission - Google Patents

Description

The present invention relates to a return spring mounting mechanism for increasing the torque capacity of an automatic transmission.

[Conventional technology]

FIG. 2 is a sectional view of an automatic transmission showing a conventional return spring mounting mechanism.

In the figure, 1 is an automatic transmission, 2 is a transmission shaft, 3 is an output gear, 4
Is a tubular portion, 5 and 6 are ball bearings, 7 and 8 are press-fitting sleeves, 9 and 10 are transmission cases, 11 is a center support, 12 is a rear support, 13 is a bush, 14 is a sun gear, 15 is a pinion, 16 Is a carrier, 17 is a one-way clutch, 18 is an inner race, 19 is a multi-disc brake device, 20 is a ring gear, 21 is a brake piston,
22 is an annular recess, 23 is a return spring, 24 is a snap ring, and U is a planetary gear device. In FIG. 2, a transmission shaft 2 for transmitting the rotation of a torque converter is rotatably mounted in an automatic transmission 1, and the transmission shaft 2 is sprite-fitted in a tubular portion 4 of an output gear 3 and The tubular portion 4 of the output gear 3 is supported by the center support 11 and the rear support 12 of the transmission cases 9 and 10 via ball bearings 5 and 6 and press-fitting sleeves 7 and 8.

On the other hand, a planetary gear unit U is mounted on the outer circumference of the transmission shaft 2. That is, the sun gear 14 is attached to the transmission shaft 2 via the push 13, and the pinion 15 that meshes with the sun gear 14 is arranged on the outer periphery of the sun gear 14. Further, the carrier 16 of the pinion 15 is connected to the inner race 18 of the outer one-way clutch 17, the inner race 18 is connected to the multi-disc brake device 19, and the ring gear 20 meshing with the pinion 15 is attached to the transmission shaft 2. It is connected.

A brake piston 21 is arranged in a space formed by the center support 11 and the transmission case 10. A return spring 23 is attached to an annular recess 22 of the brake piston 21. Installed.

[Problems to be solved by the invention]

In recent years, in order to increase the torque capacity of an automatic transmission of the same type so that it can be installed in a vehicle with a large engine torque, the width of various gears, bearings, etc. in the automatic transmission is increased to increase the torque capacity. I am trying. However, since the size of the case of the transmission is constant and various parts are set in the transmission, various restrictions are imposed on increasing the width of gears, bearings and the like.

That is, in the above conventional device, the brake piston 21 is disposed in the space formed by the center support 11 and the transmission case 10, and the brake piston 21 is
Since the return spring 22 is attached to the center support 11 by the snap ring 23, the axial length of the transmission shaft 2 in the center support 11 cannot be shortened, and as a result, the right end of the transmission (torque converter Since the length between the side) and the center support 11 cannot be increased, there is a problem in that the width of gears, bearings, etc. cannot be increased.

The present invention solves the above problem, and enables the capacity of an automatic transmission of the same type to be increased,
The purpose of the present invention is to provide an opportunity to install a return spring that enables mounting on a large vehicle with a large engine torque.

[Means for solving problems]

To this end, the return spring mounting mechanism in the automatic transmission according to the present invention has a planetary gear unit and an output gear mounted on a transmission shaft, a brake unit connected to the planetary gear unit, and a bearing and a press fit for the output gear. In an automatic transmission in which a center support of a transmission case is supported via a sleeve, and a brake piston and a return spring are arranged in a space formed by the center support and the transmission case, the press-fitting sleeve is provided from the center support. It is characterized in that the return spring is attached to the press-fitting sleeve so as to project.

[Operation and effect of the invention]

The press-fitting sleeve protrudes from the center support, and the return spring is attached to the press-fitting sleeve to enable the axial length of the transmission shaft in the center support to be shortened, and the right end of the transmission (torque converter side) and the center support The length between can be longer,
As a result, it is possible to increase the width dimension of the sun gear, pinion and ring gear, or bushes, multi-disc brakes, etc., which constitute the planetary gear device, and it is possible to increase the component setting space in the automatic transmission.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a sectional view of an automatic transmission showing a return spring mounting structure of the present invention.

In the figure, 1 is an automatic transmission, 2 is a transmission shaft, 3 is an output gear, 4
Is a cylindrical portion, 5 and 6 are ball bearings, 7 and 8 are press-fitting sleeves, 9 and 10 are transmission cases, 11 is a center support, 12 is a rear support, 13 is a bush, 14 is a sun gear, 15 is a pinion, 16 Is a carrier, 17 is a one-way clutch, 18 is an inner race, 19 is a multi-disc brake device, 20 is a ring gear, 21 is a brake piston,
22 is an annular protrusion, 23 is a return spring, 24 is a snap ring, 25 is a retainer, and U is a planetary gear device.

In FIG. 1, a transmission shaft 2 for transmitting the rotation of a torque converter is rotatably mounted in an automatic transmission 1, and the transmission shaft 2 is spline-fitted into a tubular portion 4 of an output gear 3 and The cylindrical portion 4 of the output gear 3 is provided with the ball bearings 5 and 6 and the press-fitting sleeves 7 and 8 via the center support 11 and the rear support 1 of the transmission cases 9 and 10.
Supported by 2.

On the other hand, a planetary gear unit U is mounted on the outer circumference of the transmission shaft 2. That is, the sun gear 14 is attached to the transmission shaft 2 via the push 13, and the pinion 15 that meshes with the sun gear 14 is arranged on the outer periphery of the sun gear 14. Further, the carrier 16 of the pinion 15 is connected to the inner race 18 of the outer one-way clutch 17, the inner race 18 is connected to the multi-disc brake device 19, and the ring gear 20 meshing with the pinion 15 is attached to the transmission shaft 2. It is connected.

Further, the length of the center support 11 in the axial direction of the transmission shaft 2 is shortened, and the length of the press fitting sleeve 8 in the axial direction of the transmission shaft 2 is increased so that one end of the press fit sleeve 8 projects from the center support 11. I am letting you. And
A brake piston 21 is arranged in a space formed by the center support 11 and the transmission case 10. A return spring 23 is attached to an annular protrusion 22 formed on the brake piston 21, and the return spring 23 is The upper space of the ring gear 20, that is, the inner race 18 of the one-way clutch 17 and the ring gear 2
0, the retainer 25 of the return spring 23 is bent in a stepwise manner from the upper space of the ring gear 20, and the snap ring 24 causes the press-fitting sleeve 8 to move.
Installed on.

Therefore, since the axial length of the transmission shaft 2 in the center support 11 is shortened, the length between the right end (torque converter side) of the transmission and the center support 12 can be increased, and as a result, A sun gear 14, a pinion 15, and a ring gear 20, which form the planetary gear unit U,
Alternatively, the width dimensions of the bush 13 and the multi-disc brake 19 can be increased.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made.

For example, in the above embodiment, the brake piston 21
The return spring 23 is mounted on the annular protrusion 22 formed on the inner ring 18, and the return spring 23 is arranged in the space between the inner race 18 of the one-way clutch 17 and the ring gear 20, as shown in FIG. A return spring may be mounted in such an annular recess and the return spring 23 may be arranged in a space formed by the transmission case 10 and the center support 11.

As is clear from the above description, according to the present invention, the component setting space in the automatic transmission can be increased, and the width dimensions of components such as gears and bearings can be increased accordingly, The torque capacity of the automatic transmission can be increased, and the automatic transmission of the same type can be mounted on a vehicle having a large engine torque.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic transmission showing a return spring mounting mechanism of the present invention, and FIG. 2 is a sectional view of an automatic transmission showing a conventional return spring mounting mechanism. 1 ... Automatic transmission, 2 ... Transmission shaft, 3 ... Output gear, 4
...... Cylindrical part, 5,6 ...... Ball bearing, 7,8 ......
Press-fit sleeves, 9, 10 ... transmission case, 11 ... center support, 12 ... rear support, 13 ... bush, 14 ... sun gear, 15 ... pinion, 16 ...
Carrier, 17 ... one-way clutch, 18 ... inner race, 19 ... multi-disc brake, 20 ... ring gear,
21 ... Brake piston, 22 ... Annular protrusion, 23 ...
… Return spring, 24… Snap ring, 25
…… Retainer, U …… Planetary gear unit

Claims (4)

[Claims] 1. A center support for a transmission case, in which a planetary gear device and an output gear are mounted on a transmission shaft, a brake device connected to the planetary gear device is provided, and the output gear is provided through a bearing and a press-fitting sleeve. In favor of
In an automatic transmission in which a brake piston and a return spring are arranged in a space formed by the center support and a transmission case, the press-fitting sleeve is projected from the center support and the return spring is attached to the press-fitting sleeve. Return spring mounting mechanism for automatic transmission. 2. The return spring mounting mechanism in an automatic transmission according to claim 1, wherein the return spring is arranged in an outer peripheral space of the planetary gear device. 3. A return spring mounting mechanism for an automatic transmission according to claim 1 or 2, wherein the return spring is mounted on an annular protrusion provided on a brake piston. 4. The automatic transmission according to claim 2 or 3, wherein the retainer for attaching the return spring is bent and disposed in the upper space of the planetary gear device. Return spring mounting mechanism.