JPH04248047A - Power transmitting device for automatic transmission - Google Patents

Abstract

PURPOSE:To favorably arrange a power transmitting device including power transmitting elements as a whole without increasing the size of a transmission in arranging the power transmitting device such as a hydraulic clutch, etc., and the power transmitting elements to the transmitting device on a shaft of the transmission. CONSTITUTION:In a clutch piston 93 having a cylinder part 93a extended in the axial direction of an input shaft 11 of an automatic transmission 1, a pressing part 93b projected outward from the cylinder part 93a for pressing a friction plate and a flange part 93c extended inward from the middle of the cylinder part 93a, a centrifugal hydraulic pressure balance chamber 94 is formed on one side of the flange part 93c, while a space 95 is formed on the other side, and a first one-way clutch 61 as a power transmitting element to a clutch drum 90 is stored and arranged in this space 95.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for an automatic transmission, and more particularly to a power transmission device that is disposed on a shaft of a transmission and transmits rotation of the shaft to other rotating members.

0002

[Prior Art] Automatic transmissions installed in automobiles combine a torque converter and a speed change gear mechanism, and the power transmission path of this speed change gear mechanism is controlled by selectively operating multiple power transmission devices such as hydraulic clutches and brakes. The hydraulic clutch is configured to automatically switch gears depending on the operating condition, and as described in, for example, Japanese Patent Application Laid-open No. 62-52249, when the clutch is released, In order to improve the freedom of
A hydraulic clutch is known in which a centrifugal hydraulic balance chamber is formed on one side of a clutch piston and faces a hydraulic chamber.

0003

By the way, as mentioned above, it is desirable to form a centrifugal hydraulic balance chamber on one side of the clutch piston constituting the hydraulic clutch as a power transmission device, and to form a centrifugal hydraulic balance chamber on the other side of the clutch piston. In some cases, a power transmission element to the clutch drum, such as a one-way clutch that regulates the rotation of the clutch drum, is disposed on the side of the clutch drum that forms a hydraulic chamber between the two. The axial dimension of the hydraulic clutch, which serves as a power transmission device including the clutch, becomes large, resulting in an increase in the size of the entire transmission.

[0004] Therefore, the present invention aims to improve the speed of the transmission by properly arranging the power transmitting elements when a power transmitting device such as a hydraulic clutch and a power transmitting element to the transmitting device are arranged side by side on the shaft of the transmission. The purpose is to avoid increasing the size.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the present invention is characterized by the following structure.

That is, the clutch drum, the clutch hub provided inside the drum, the splines formed on the outer surface of the clutch hub, and the splines formed on the inner surface of the clutch drum alternately engage with each other. A power transmission device for an automatic transmission having a plurality of friction plates joined together, and a clutch piston that presses the plurality of friction plates to connect the clutch drum and the clutch hub, the clutch piston comprising: a cylindrical portion extending in the axial direction; a pressing portion protruding outward from the cylindrical portion to press the friction plate; and a flange portion extending inward from the middle of the cylindrical portion; A centrifugal hydraulic balance chamber is formed on one side, and a space is formed on the other side, and the inner peripheral portion of the clutch drum is bent within this space, and the clutch drum is connected to the clutch drum within this bent portion. The power transmission element is housed and arranged.

[0007]

[Operation] According to the above structure, a centrifugal hydraulic balance chamber is provided on one side of the flange of the clutch piston constituting the power transmission device, and a space is formed on the other side of the flange. In the case where the power transmission element to the clutch drum is housed in the bent part of the clutch drum bent in this space, the power transmission element is arranged in parallel with the clutch drum in the axial direction of the transmission. The axial dimension of is reduced, and the entire power transmission device in which the power transmission element is provided together with the centrifugal hydraulic balance chamber is configured more compactly, and its layout is improved.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

First, the overall structure of the automatic transmission according to this embodiment will be explained based on FIG.
Inside the transmission case 2, the main components are a torque converter 10, a turbine shaft 11 as an input shaft to which the output of the torque converter 10 is transmitted, and an output shaft 12 arranged parallel to the turbine shaft 11. , a plurality of planetary gear mechanisms 20, 30, 4 as transmission gear devices disposed on the input shaft 11 and the output shaft 12.
0, a plurality of frictional engagement elements 51 to 57 such as clutches and brakes that switch the power transmission paths of these planetary gear mechanisms 20, 30, 40, and first to third one-way clutches 61, 62, 63, Through these selective operations, five forward gears (first to fifth gears) and one reverse gear (first gear) can be obtained.

The torque converter 10 includes a pump 14 fixedly installed in a case 13 connected to an output shaft A of the engine, and a pump 14 arranged opposite to the pump 14 and driven by the pump 14 via hydraulic oil. a turbine 15 that is
A stator 17 is provided between the pump 14 and the turbine 15 and connected to the transmission case 2 via the one-way clutch 16 to increase torque, and the stator 17 is provided between the case 13 and the turbine 15. Case 1
and a lock-up clutch 18 that directly connects the engine output shaft A and the turbine 15 via the turbine shaft 11.
, 30 side.

Note that the case 13 includes an oil pump 1.
9 are connected, and the oil pump 19 is driven as the case 13 rotates.

Each of the planetary gear mechanisms 20,
30, one planetary gear mechanism 20 includes a sun gear 21 loosely fitted onto the turbine shaft 11, and a plurality of pinion gears 2 meshing with the sun gear 21, respectively.
2...22, a ring gear 23 that meshes with each pinion gear 22, and a carrier 24 that rotatably supports each pinion gear 22. The other planetary gear mechanism 30 includes a sun gear 31 loosely fitted onto the turbine shaft 11, a plurality of pinion gears 32...32 that mesh with the sun gear 31, a ring gear 33 that meshes with each pinion gear 32, and a ring gear 33 that meshes with each pinion gear 32. The carrier 34 rotatably supports each pinion gear 32, and the ring gear 23 and sun gear 31 are connected, and the carriers 24, 34 are each connected to an output gear 81.

On the other hand, a first clutch 51 is arranged in series between the sun gear 21 and the turbine shaft 11, and a first brake 52 is provided between the first clutch 51 and the transmission case 2. , also the first clutch 5
A second brake 53 is provided between the transmission case 1 and the transmission case 2 via a first one-way clutch 61. Further, a second clutch 54 is arranged in series between the sun gear 31 and the turbine shaft 11, and a third brake 55 and a second one-way clutch 62 are arranged between the ring gear 34 and the transmission case 2, respectively. It is provided.

The planetary gear mechanism 40 disposed on the output shaft 12 includes a sun gear 41 provided integrally with the output shaft 12, a plurality of pinion gears 42...42 meshing with the sun gear 41, and a plurality of pinion gears 42... It is composed of a ring gear 43 that meshes with the carrier 44 that rotatably supports each of the pinion gears 42, and an input gear 82 that is loosely fitted onto the ring gear 43 on the output shaft 12 and meshes with the output gear 81. The carrier 44 is also connected to a drive gear 83 loosely fitted onto the output shaft 12. Further, the input gear 82 is provided with a third clutch 56, and a third clutch 56 is provided between the third clutch 56 and the transmission case 2.
A one-way clutch 63 and a fourth brake 57 are interposed, so that the rotation of the input gear 82 meshing with the output gear 81 is transmitted to the drive gear 83 via the planetary gear mechanism 40. This results in
The power transmission path of the planetary gear mechanism 20, 30, 40 is connected to a plurality of frictional engagement elements 51 to 51 such as clutches and brakes.
57 and first to third one-way clutches 61, 62
, 63, the output of the engine output shaft A is changed in speed according to the operating condition, and the output is shifted to the drive gear 8.
3.

[0015] Here, to briefly explain the relationship between the operating states of the frictional engagement elements 51 to 57 such as the clutches and brakes and the first to third one-way clutches 61 to 63 and the gears, in the first gear, The second clutch 54 is engaged, the third and fourth brakes 55 and 57 are engaged, and the second and third one-way clutches 62 and 63 are brought into a power transmitting state. In the second speed, the third clutch 56 is engaged together with the second clutch 54, only the third brake 55 is engaged, and only the second one-way clutch 62 is in the power state. Furthermore, in the third speed, the third clutch 56 that was engaged in the second speed is released, and each of the first, second, and fourth brakes 52, 53 is released.
, 57 are respectively engaged, and both the first and third one-way clutches 61 and 63 are brought into a power transmitting state. In addition, in the fourth speed, the first and second clutches 51, 54
is engaged, and the second and fourth brakes 53, 57 are engaged, and only the third one-way clutch 63 is brought into the power transmission state.Furthermore, in the fifth gear, the first to third clutches 51, 54, 56 is engaged, and only the second brake 53 is engaged, and all the one-way clutches 61 to 63 are in an idle state. In addition, in the reverse gear, only the first and third clutches 51 and 56 are engaged, all the brakes are released, and all the one-way clutches are idled.

In this embodiment, the first clutch 51 is constructed as follows. That is, as shown enlarged in FIG. 2, the first clutch 51 includes a clutch drum 90, a clutch hub 91 provided inside the drum 90 and integrated with the input shaft 11, and the clutch hub 91. A spline 91a formed on the outer surface of the clutch drum 90 and a spline 90 formed on the inner surface of the clutch drum 90.
The clutch piston 93 has a plurality of friction plates 92...92 that are alternately engaged with the clutch drum 90 and the clutch hub 91, and a clutch piston 93 that presses the plurality of friction plates 92 to connect the clutch drum 90 and the clutch hub 91. The clutch piston 93 includes a cylindrical portion 93a extending in the axial direction, a pressing portion 93b that protrudes outward from the cylindrical portion 93a and presses each of the friction plates 92, and a pressing portion 93b that extends inward from the middle of the cylindrical portion 93a. A flange portion 93 extending in the direction
A centrifugal hydraulic balance chamber 94 is formed on one side of the flange 93a, and a space 9 is formed on the other side.
5 is formed, an inner circumferential portion 90b of the clutch drum 90 is bent within this space 95, and a first one-way as a power transmission element for regulating rotation of the clutch drum 90 is formed within this bent portion 90c. A clutch 61 is housed.

Note that the bent portion 9 of the clutch drum 90
A hydraulic chamber 96 is formed between the flange portion 93c of the clutch piston 93 and the friction plate 92.
A part of the sun gear 21 in the planetary gear mechanism 20
The rotation of the input shaft 11 is input to the planetary gear mechanism 20 when the first clutch 51 is engaged.

According to the above configuration, the flange portion 93 of the clutch piston 93 constituting the first clutch 51
A centrifugal hydraulic balance chamber 94 is provided on one side of the flange portion 93c, and a space 95 is formed on the other side of the flange portion 93c.
The first one-way clutch 61 as a power transmission element that regulates the rotation of the drum 90 is housed in the bent portion 90c of the transmission 1 in parallel with the clutch drum 90. input shaft 1
1, the axial dimension is shortened when the first one-way clutch 61 as a power transmission element is provided together with the centrifugal hydraulic balance chamber 94.
The entire clutch 51 is made more compact, and its layout is improved.

[0019]

According to the above structure, a centrifugal hydraulic chamber is provided on one side of the flange portion of the clutch piston constituting the power transmission device, and a space is formed on the other side of the flange portion. The power transmission element to the clutch drum is housed in the bent part of the clutch drum bent in this space, so that the power transmission element is arranged on the shaft of the transmission in parallel with the clutch drum. As a result, the axial dimension in the case is shortened, and the entire power transmission device in which the power transmission element is provided together with the centrifugal hydraulic balance chamber is configured more compactly, and the layout thereof is improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of an automatic transmission.

FIG. 2 is an enlarged vertical cross-sectional view of main parts showing the configuration of a hydraulic clutch as a power transmission device.

[Brief explanation of symbols]

51 First clutch 61 First one-way clutch 90
Clutch drum 90b Inner peripheral part 90c Bent part 91 Clutch hub 92 Friction plate 93 Clutch piston 93a Cylindrical part 93b Pressing part 93c Flange part 94 Centrifugal hydraulic balance chamber 95 Space

Claims (1)

[Claims] 1. A clutch drum, a clutch hub provided inside the drum, a spline formed on an outer surface of the clutch hub, and a spline formed on an inner surface of the clutch drum alternately engaged with each other. A power transmission device for an automatic transmission having a plurality of friction plates joined together, and a clutch piston that presses the plurality of friction plates to connect the clutch drum and the clutch hub, the clutch piston comprising: a cylindrical portion extending in the axial direction; a pressing portion protruding outward from the cylindrical portion to press the friction plate; and a flange portion extending inward from the middle of the cylindrical portion; A centrifugal hydraulic balance chamber is formed on one side, and a space is formed on the other side, and the inner peripheral portion of the clutch drum is bent within this space, and the clutch drum is connected to the clutch drum within this bent portion. A power transmission device for an automatic transmission, characterized in that a power transmission element is arranged in a housed manner.