JP2543643Y2 - Lock-up device for torque converter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lockup device for a torque converter, and more particularly to a lockup device for a torque converter disposed between an input member and an output member of the torque converter.

[0002]

2. Description of the Related Art Some torque converters are provided with a lock-up device for mechanically connecting an input side front cover and an output side member. This lockup device is arranged between the turbine connected to the output side member and the front cover on the input side. Then, at a predetermined rotational speed or more, the power of the front cover is directly transmitted to the output side member or the turbine. There is also known a multi-plate lock-up device in which a plurality of friction members are provided between a front cover and a piston in order to increase the torque transmission capacity at the time of lock-up.

FIG. 3 shows an example of a multi-plate lock-up device. In this device, the input side clutch plate 31 is engaged with the front cover 30, and the output side clutch plate 32 is disposed between the input side clutch plate 31 and the front cover 30. The output clutch plate 32 is engaged with an outer peripheral portion of a damper unit 33 as an output side member. A piston 35 is disposed between the input side clutch plate 31 and the turbine 34, and the piston 35 and the damper unit 33 are fixed by rivets 36.

When the lock-up device operates, the piston 3
5 is the front cover 30 together with the damper unit 36
To the input side and the output side clutch plate 31,
32 is pressed against the front cover 30. Thus, the power of the front cover 30 is controlled by the clutch plates 31,
The power is transmitted to the output hub 37 via the damper unit 33 and the output hub 37.

[0005]

In the conventional multi-plate lock-up device, the piston 35 and the damper unit 3 are used.
3 are fixed by rivets 36. Therefore, the number of manufacturing and assembling steps is large, and the manufacturing cost is high. Further, since it is necessary to move the damper unit 33 in the axial direction together with the piston 35, it is necessary to form a spline engagement portion between the inner peripheral end of the damper unit 33 and the outer peripheral portion of the output hub 37. Therefore, the processing cost is high, and the cost of the entire apparatus is high.

An object of the present invention is to simplify the manufacturing and assembling steps and reduce the cost.

[0007]

A lock-up device for a torque converter according to the present invention is a device disposed between an input member and an output member of a torque converter.
A piston disposed between the input side member and the output side member so as to be movable in the axial direction, and a piston disposed between the piston and the input side member so as to be axially movable and non-rotatably engaged with the input side member. An input side clutch plate, an output side clutch plate disposed between the input side clutch plate and the input side member and axially movably and non-rotatably engaged with the output side member, and fixed to the piston by welding, A connection member having an engagement claw portion that is axially movably and non-rotatably engaged with the output side member.

[0008]

In the lock-up device for a torque converter of the present invention, the output clutch plate and the input clutch plate are sandwiched between the piston and the input member by moving the piston toward the input member. This allows
The rotational force of the input member is transmitted to the output member via the input clutch plate and the output clutch plate.

At this time, the piston is connected to the output side member by the connecting member. The connecting member is fixed to the piston by welding, and is engaged with the output side member movably in the axial direction by an engaging claw portion. For this reason, there is no need to fix the piston and the output side member with rivets as in the conventional case, and the manufacturing and assembling steps are simplified. Further, since the output side member can be fixed in the axial direction, there is no need to provide a spline engagement portion, and the processing is facilitated. The process for connecting the side members can be simplified.

[0010]

FIG. 1 shows a lock-up device for a torque converter employing an embodiment of the present invention (OO).
Is the center line). In FIG. 1, this torque converter
Mainly, front cover 1, three types of impellers (impeller 2, turbine 3, stator 4) arranged concentrically with front cover 1, and lockup device 5 arranged between front cover 1 and turbine 3 It is composed of

The front cover 1 is a member connected to an input member (not shown) on the engine side. A front end (right end in FIG. 1) of an outer peripheral wall 1a of the front cover is fixed to an outer peripheral wall of an impeller shell 2a constituting the impeller 2. A plurality of blade members are arranged inside the impeller shell 2a. A turbine 3 having a plurality of blade members is arranged at a position facing the impeller 2. An inner peripheral end of the turbine 3 is fixed to an outer peripheral portion 6 a of the turbine hub 6. On the inner periphery of the turbine hub 6,
It has a spline 7 that engages with an output shaft (not shown). A stator 4 is arranged between the inner peripheral portion of the impeller 2 and the inner peripheral portion of the turbine 3.

A space surrounded by the front cover 1 and the impeller shell 2a forms a hydraulic oil chamber 8.
The hydraulic oil chamber 8 is supplied with hydraulic oil from a hydraulic control device (not shown) through an oil passage 11a. An oil passage 11b is also formed between the lockup device 5 and the front cover 1. The lock-up device 5 includes a piston 12
, An input clutch plate 13 and an output clutch plate 14 disposed between the piston 12 and the front cover 1, a damper unit 15, and a driven plate 16 fixed to the piston 12.

The piston 12 has a disk shape and has an inner peripheral portion 12.
a and the outer peripheral portion 12b extend to the turbine 3 side, respectively. The inner peripheral portion 12a is supported by the outer peripheral portion 6a of the turbine hub 6 so as to be slidable in the axial direction. A friction member 12c is fixed to the outer peripheral portion of the side surface. The input side clutch plate 13 is a ring-shaped member, and is disposed between the front cover 1 and the piston 12. An engagement tooth portion is formed on the outer peripheral portion of the input side clutch plate 13. On the other hand, inside the outer peripheral wall 1a of the front cover 1, an engaging portion 1b that meshes with the tooth portion of the input side clutch plate 13 is formed. With such a configuration, the outer peripheral tooth portion of the input side clutch plate 13 is engaged with the engaging portion 1b of the outer peripheral wall of the front cover, and is movable in the axial direction with respect to the front cover 1 so as not to rotate.

The output side clutch plate 14 is a substantially ring-shaped member, and is disposed between the input side clutch plate 13 and the front cover 1. And it has ring-shaped friction material parts 14a and 14b on both sides. As shown in the plan view of FIG. 2, a plurality of cut-and-raised pieces 14c that engage with the outer peripheral portion of the damper unit 15 are formed on the inner peripheral portion thereof so as to protrude toward the piston. For this reason, the output side clutch plate 14 is axially movable with respect to the damper unit 15 and cannot rotate.

The damper unit 15 is arranged below the output side clutch plate 14. The damper unit 15 includes a pair of side plates 17, a flange 18 disposed between the pair of side plates 17 so as to be relatively rotatable with the plates 17, and a torsion spring 19 for elastically connecting the two. And As shown in FIG. 2, engagement teeth are formed on the outer periphery of the flange 18, and are engaged with the cut-and-raised pieces 14 c of the output-side clutch plate 14 as described above.

The driven plate 16 has a ring-shaped fixing portion 16b and a plurality of claws 16a cut and raised from the fixing portion 16b. The claw portion 16a has a flange 18
In the groove 18b. The fixing portion 16b is fixed to the side surface of the piston 12 by welding. In the torque converter according to the present embodiment, the torque of the engine is transmitted from the front cover 1 and the impeller 2 to the turbine 3 via the working oil. In addition, the stator 4 includes the turbine 3
The oil flow from the side to the impeller 2 side is adjusted so that a high torque ratio is obtained when the impeller 2 rotates at a high speed and the turbine 3 rotates at a low speed. Turbine 3
Of the output shaft via the turbine hub 6 (not shown)
Conveyed to.

When the output shaft rotates at a constant speed, the operating oil in the operating oil chamber between the front cover 1 and the piston 12 is drained, and as a result, the piston 12 is pressed against the front cover 1 (lock-up operation). . Then, the piston 12 presses the input side clutch plate 13 and the output side clutch plate 14 against the front cover 1. The rotational force of the front cover 1 is
3, transmitted to the output side clutch plate 14,
Flange 1 from cut-and-raised piece 14c via groove 18b
8 is transmitted. The torque transmitted to the flange 18 is
The power is transmitted to the pair of side plates 17 via the torsion spring 19 and transmitted to the turbine hub 6.

At this time, when the piston 12 is pressed against the front cover 1, the claw 16a of the driven plate 16 also moves in the groove 18b toward the front cover 1. In such an embodiment, it is not necessary to form a spline groove in the outer peripheral portion 6a of the turbine hub 6 and to form a spline engaging portion in the inner peripheral end of the side plate 17 as in the related art. Since the driven plate 16 is welded and fixed to the piston 12, the steps of drilling and swaging are omitted. Therefore, it is possible to reduce the number of steps in manufacturing and assembling the lock-up device, and to manufacture the lock-up device at low cost.

[0019]

According to the lock-up device for a torque converter according to the present invention, the connecting member having the engaging claw portion movably engaged with the output side member in the axial direction is fixed to the piston by welding. The mechanism for moving in the axial direction is simplified. Therefore, the step of connecting the piston and the output side member can be simplified.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a torque converter according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view taken along line II-II of FIG.

FIG. 3 is a partial longitudinal sectional view of a conventional multi-plate lock-up device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front cover 3 Turbine 12 Piston 13 Input side clutch plate 14 Output side clutch plate 16 Driven plate 16a Claw part

Claims (1)

(57) [Scope of request for utility model registration] 1. A torque converter lock-up device disposed between an input-side member and an output-side member of a torque converter, wherein the lock-up device is axially movable between the input-side member and the output-side member. An input-side clutch plate disposed between the piston and an input-side member and axially movably and non-rotatably engaged with the input-side member; and the input-side clutch plate and the input side. An output-side clutch plate that is disposed between the output-side member and axially movably and non-rotatably engages with the output-side member; fixed to the piston by welding; A lock-up device for a torque converter, comprising: a coupling member having an engagement claw portion that non-rotatably engages.