JPH0723852U - Lockup device for torque converter - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts of the frictional resistance generating mechanism in the lockup device of the torque converter. [Structure] Lockup device 8 of torque converter 1
Is a disc-shaped piston 13 and a retaining plate 18
, Torsion spring 17, and frictional resistance generating mechanism 1
5 and. The disc-shaped piston 13 is movably arranged between the front cover 4 and the turbine 6 and can be pressed against the front cover 4. Retaining plate 1
Reference numeral 8 is fixed to the disc-shaped piston 13, and has a bent claw 18b on the outer periphery and an inner peripheral end 18c on the inner periphery. The torsion spring 17 is supported by the bending claw 18b,
It is connected to the turbine 6. Friction resistance generating mechanism 15
Is a plate member 1 engaged with the turbine 6 so as to rotate integrally therewith.
9 and the plate member 19 supported by the inner peripheral end 18c of the piston 1
It includes a wave spring 20 biasing to the 3 side, and generates frictional resistance when the piston and the turbine 6 rotate relative to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lockup device, and more particularly to a lockup device for mechanically connecting a front cover and a turbine of a torque converter.

[0002]

[Prior art]

 A torque converter is a device that has three types of impellers (impeller, turbine, stator) inside and transmits power by the fluid inside. The impeller is integrally connected to the front cover that is connected to the input side member, and the turbine is connected to the output side member. When torque is input from the input side member to the front cover and the impeller, the turbine is rotated via the fluid, and the torque is transmitted to the output side member via the turbine hub.

Generally, a lock-up device for mechanically connecting the front cover and the turbine is arranged inside the torque converter between the front cover and the turbine. This lock-up device is composed of a disk-shaped piston that is in pressure contact with the front cover, and an elastic connection mechanism that connects the disk-shaped piston and the turbine in the circumferential direction. This elastic coupling mechanism includes a torsion spring and the like, and is for absorbing a shock when the piston is pressed against the front cover.

Further, there is also provided a lockup device provided with a frictional resistance generating mechanism for the purpose of damping torsional vibration on the input side.

[0005]

[Problems to be solved by the device]

 The frictional resistance generating mechanism provided in the conventional lock-up device is mainly composed of a plate member that is engaged with the turbine so as to rotate integrally, and an elastic member that biases the plate member toward the piston. Further, a supporting member for supporting the elastic member is provided. As described above, the frictional resistance generating mechanism portion of the lockup device has a large number of parts.

An object of the present invention is to reduce the number of parts of a frictional resistance generating mechanism in a torque converter lockup device.

[0007]

[Means for Solving the Problems]

 The lockup device for a torque converter according to the present invention is used in a torque converter including a front cover connected to an input side member and a turbine connected to an output side member, and includes a disc-shaped piston and a retainer. And a first elastic member and a frictional resistance generating mechanism.

The disk-shaped piston is movably arranged between the front cover and the turbine and can be pressed against the front cover. The retaining plate is fixed to a disc-shaped piston and has a first spring support portion on the outer circumference and a second spring support portion on the inner circumference. The first elastic member is supported by the first spring support portion and is connected to the turbine. The frictional resistance generating mechanism includes a plate member that engages with the turbine so as to rotate integrally, and a second elastic member that is supported by a second spring supporting portion and biases the plate member toward the piston side. Generate frictional resistance when and rotate relative to each other.

[0009]

[Action]

 In the lockup device for a torque converter according to the present invention, the disk-shaped piston moves to the front cover side and is pressed against the front cover during the lockup operation. The torque transmitted from the input side member is directly transmitted to the output side member via the front cover, the lockup device and the turbine. When torsional vibration occurs in the lockup device, the piston and turbine repeat relative rotation. At this time, the first elastic member expands and contracts between both members, and the frictional resistance generation mechanism further generates frictional resistance to damp the energy of the torsional vibration. Therefore, it is possible to prevent the torsional vibration from being transmitted to the output side member.

In this lockup device, the retaining plate has a second spring support portion that supports the second elastic member of the frictional resistance generating mechanism. In other words, the existing retaining plate is used as a part of the frictional resistance generation mechanism, which reduces the number of parts compared to the conventional one.

[0011]

【Example】

 FIG. 1 shows a torque converter mechanism employing a lockup device according to an embodiment of the present invention. Here, O-O is the rotation center line of the torque converter, the engine (not shown) is arranged on the left side of the drawing, and the transmission (not shown) is arranged on the right side of the drawing.

In the torque converter 1, the front cover 4 and the impeller shell 5 a fixed to the outer peripheral wall 4 a of the front cover 4 form a hydraulic oil chamber. The inner peripheral end of the impeller shell 5a is fixed to the impeller hub 31. A plurality of nuts 30 are fixed to the outer peripheral wall 4a of the front cover 4. The flexible plate 2 of the power transmission device is fixed to the nut 30 so that the driving force from the crank shaft of the engine is input to the front cover 4. A flat friction surface 4b is formed on the inner wall of the outer peripheral portion of the front cover 4.

A torque converter main body including an impeller 5, a turbine 6, and a stator 7 and a lockup device 8 are arranged in a hydraulic oil chamber in the torque converter 1. A plurality of impeller blades 5b are fixed inside the impeller shell 5a, and the impeller 5 is constituted by both of them. A turbine 6 is arranged at a position facing the impeller 5. The turbine 6 is composed of a turbine shell 6a and a plurality of turbine blades 6b fixed inside the turbine shell 6a. The inner peripheral end portion of the turbine shell 6a is fixed to the flange portion 9a of the turbine hub 9 with rivets 10. The turbine hub 9 has a spline hole 11 on its inner peripheral portion that engages with an output shaft (not shown).

A stator 7 is arranged between the inner peripheral portion of the impeller 5 and the inner peripheral portion of the turbine 6. The stator 7 is for adjusting the flow direction of the hydraulic oil returned from the turbine 6 to the impeller 5, and has an annular stator carrier 7a and a plurality of stator blades 7b formed on the outer peripheral surface of the stator carrier 7a. It consists of A one-way clutch mechanism 12 is arranged on the inner peripheral portion of the stator 7.

The lockup device 8 is arranged concentrically between the front cover 4 and the turbine 6, and mainly includes a disc-shaped piston 13, an elastic coupling mechanism 14, and a hysteresis torque generating mechanism 15. It consists of The disc-shaped piston 13 has an inner circumferential end slidably supported on the outer circumferential surface of the turbine hub 9 in the axial direction and the circumferential direction. At the outer peripheral end of the piston 13, an annular friction member 32 is adhered to the surface of the front cover 4 facing the friction surface 4b. The piston 13 has a cylindrical end wall 13a extending to the transmission side (right side in FIG. 1) at the outer peripheral side end portion.

The elastic coupling mechanism 14 is arranged on the inner peripheral side of the end wall 13 a of the piston 13. The elastic coupling mechanism 14 includes a disc-shaped retaining plate 18 and a plurality of torsion springs 17. The retaining plate 18 has an intermediate portion in the radial direction fixed to the piston 13 by a rivet 33. The retaining plate 18 has a cylindrical portion 18a extending in an annular shape on the outer peripheral portion, and accommodates a plurality of torsion springs 17 extending in the circumferential direction inside the cylindrical portion 18a. Further, both ends of each torsion spring 17 in the circumferential direction are supported by bending claws 18b formed on the retaining plate 18. An inner peripheral end 18c of the retaining plate 18 extends inward in the radial direction and serves as a support portion for a frictional resistance generating mechanism 15, which will be described later.

The driven plate 16 is an annular plate member as is clear from FIG. 2, and is fixed to the back surface (the surface on the piston 13 side) of the turbine shell 6a by spot welding, for example. A plurality of bent claws 16a are formed on the outer peripheral edge of the driven plate 16. These bent claws 16a are locked to both ends of the torsion spring 17 in the circumferential direction. In this way, the piston 13 and the turbine shell 6 a are elastically connected in the circumferential direction via the elastic connecting mechanism 14. A plurality of second bending claws 16b bent toward the piston 13 are formed on the inner peripheral end of the driven plate 16. The bending claw 16b is locked to a frictional resistance generating mechanism 15, which will be described later. Further, the driven plate 16 is formed with a plurality of punched holes 16c to reduce the weight.

The frictional resistance generating mechanism 15 is arranged in a space between the radial intermediate portion of the piston 13 and the radial intermediate portion of the turbine shell 6 a. As is apparent from FIG. 3, the frictional resistance generating mechanism 15 includes an annular plate member 19 and a spring member (wave spring) 20 that presses the plate member 19 toward the piston 13 side. The spring member 20 is supported by the inner peripheral end 18c of the retaining plate 18. The plate member 19, the spring member 20, and the retaining plate inner peripheral end 18c are attached to the piston 13 by rivets 22. Further, a ring-shaped facing 21 is bonded to the side surface of the plate member 19 on the piston 13 side at the outer peripheral portion thereof. As is apparent from FIG. 4, a plurality of pairs of guide portions 19 a cut and raised in the axial direction are formed at the inner peripheral end of the plate member 19. The second bent claw 16b of the driven plate described above is inserted between the pair of guide portions 19a. In this state, the plate member 19 is engaged with the driven plate 16 so as to be immovable in the circumferential direction and movable in the axial direction. It should be noted that the plate member 19 and the facing 21 are formed with a circumferential elongated hole through which the body of the rivet 22 penetrates.

With the above configuration, the piston 13 and the plate member 19 are relatively rotatable within a predetermined angle. The distance that the rivet 22 can move within the circumferential elongated hole formed in the plate member 19 and the facing 21 is determined by the torsion spring 17 between the retaining plate 18 and the first bending claw 16a of the driven plate 16. When set shorter than the distance compressed by, the rivet 22 functions as a stopper.

Next, the operation of the above embodiment will be described. The torque from the crankshaft on the engine side is transmitted from the flexible plate 2 of the power transmission device to the front cover 4 of the torque converter 1. As a result, the front cover 4 and the impeller 5 rotate, and this torque is transmitted to the turbine 6 via the hydraulic oil. The flow of hydraulic oil returning from the turbine 6 to the impeller 5 is adjusted by the status 7. The torque of the turbine 6 is transmitted to the output shaft (not shown) via the turbine hub 9.

When the output shaft (not shown) reaches a constant rotational speed, the hydraulic pressure of the hydraulic oil chamber in the torque converter 1 is increased, and the operating oil between the front cover 4 and the piston 13 is drained, As a result, the piston 13 is pressed forward. Then, the friction member 32 of the piston 13 is pressed against the friction surface 4 b of the front cover 4. As a result, the rotational force of the front cover 4 is transmitted from the piston 13 to the turbine 6 via the elastic coupling mechanism 14 and further via the driven plate 16. That is, the torque of the front cover 4 is mechanically transmitted to the output shaft (not shown) via the turbine 6. Therefore, energy loss is reduced and a good fuel economy can be obtained.

Further, during the above lock-up operation, if torsional vibration occurs in the lock-up measure device 8, the piston 13 and the turbine 6 repeat relative rotation. At this time, the torsion spring 17 expands and contracts in the circumferential direction, and the piston 13 and the friction member 21 slide in the hysteresis torque generating mechanism 15 to generate frictional resistance. This frictional resistance damps the energy of the torsional vibration.

In the above-described embodiment, the inner peripheral portion of the driven plate 16 and the second bending claw 16b are the portions that have been conventionally punched. As described above, by effectively using the driven plate 16, it is not necessary to use a separate member. Further, the inner peripheral end 18c of the retaining plate 18 is also a part that has been conventionally punched. Thus, the retaining plate 18 also serves as a conventional support plate. As a result, the lock-up device 8 has a reduced number of parts.

[Other Embodiments] A frictional resistance generating mechanism 25 shown in FIG. 5 is mainly arranged between the radial intermediate portion of the piston 13 and the turbine shell 6a similarly to the above-described embodiment. It is located in the space. The frictional resistance generating mechanism 25 mainly includes an annular plate member 39 and a cone spring 40 that urges the plate member 39 toward the piston 13. The inner peripheral edge of the cone spring 40 is supported by the inner peripheral edge 38c of the retaining plate. The plate member 39, the cone spring 40, and the retaining plate inner peripheral end 38c are attached to the piston 13 by a plurality of rivets 42. In addition, a ring-shaped facing 41 is mounted on the outer peripheral portion of the plate member 39 on the side surface on the piston 13 side. A ring-shaped plate 43 is arranged between the cone spring 40 and the plate member 39. A plurality of protrusions 29 a that protrude radially inward are formed on the inner peripheral edge of the plate member 39.

The engagement plate 44 is fixed to the outer peripheral flange 9 a of the turbine hub 9 and the turbine shell 6 a with rivets 10. The engagement plate 44 has a cylindrical wall 44a extending axially from the outer peripheral end thereof. A plurality of protrusions 44b are formed at the tip of the wall 44a. The protrusions 44b are in contact with both end faces of the protrusion 29a of the plate member 39 in the circumferential direction. As a result, the plate member 39 is engaged with the engaging plate 44 so as to be movable in the axial direction but not relatively rotatable.

The plate member 39 and the facing 41 are formed with circumferentially elongated holes through which the body of the rivet 42 passes. As a result, the rivet 42 and the plate member 39 are relatively rotatable within a predetermined angle. Also in this embodiment, the inner peripheral edge 38c of the retaining plate also serves as the conventional supporting plate. Therefore, it is not necessary to install a new support plate, and the number of parts is decreasing.

[0027]

[Effect of device]

 In the lockup device for a torque converter according to the present invention, the retaining plate has a second spring support portion that supports the second elastic member of the frictional resistance generating mechanism. In other words, by using the existing parts, it is not necessary to newly use separate parts. As a result, the number of parts is reduced compared to the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a torque converter to which an embodiment of the present invention is applied.

FIG. 2 is a partial perspective view of a driven plate.

FIG. 3 is a vertical sectional view of a frictional resistance generating mechanism.

FIG. 4 is a partial perspective view of a plate member.

FIG. 5 is a view corresponding to FIG. 3 in another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque converter 4 Front cover 6a Turbine shell 8 Lockup device 13 Disc-shaped piston 14 Elastic coupling mechanism 15,25 Friction resistance generating mechanism 18 Retaining plate 18b Bending claws 18c, 38c Inner peripheral end portion 19,39 Plate member 20 Wave Spring 40 Cone Spring

Claims (1)

[Scope of utility model registration request] 1. A lockup device for a torque converter comprising a front cover connected to an input member and a turbine connected to an output member, the lockup device being movable between the front cover and the turbine. A disc-shaped piston that is arranged and can be pressed against the front cover; a retaining plate that is fixed to the disc-shaped piston and has a first spring support portion on the outer periphery and a second spring support portion on the inner periphery A first elastic member supported by the first spring support portion and connected to the turbine; a plate member engaged with the turbine so as to rotate integrally; and a plate member supported by the second spring support portion. A friction including a second elastic member biasing to the piston side and generating frictional resistance when the piston and the turbine rotate relative to each other. A lockup device for a torque converter including a resistance generating mechanism.