JPH10213204A - Rock-up damper for torque converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set up torsional characteristics and stopper torque by providing a stopper mechanism reducing the load on a coil spring. SOLUTION: A lock-up damper for a torque converter is provided with a retaining plate, a driven member, the first coil spring 13A, the second spring 13B, and an intermediate member 30. The first spring 13A is arranged between the retaining plate and the first coil spring 13A. The second spring 13B is arranged between the retaining plate and the first coil spring 13A. The intermediate member 30 is arranged between both coil springs 13A and 13B. The intermediate member 30 is provided with a spring support section 32 supporting both springs 13A, 13B in the peripheral direction and hook sections 33a, 33b0, 34a, 34b, hookable on the retaining plate or the driven member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock-up damper included in a lock-up mechanism of a torque converter for attenuating vibration transmitted from an input-side rotating body to an output-side rotating body.

[0002]

2. Description of the Related Art Generally, a damper mechanism attenuates vibration transmitted from an input-side rotating body to an output-side rotating body while transmitting torque from an input-side rotating body to an output-side rotating body. As an example of the damper mechanism, there is a damper (hereinafter, referred to as a lock-up damper) included in a lock-up mechanism disposed inside the torque converter.

[0003] A torque converter is a device having three types of impellers (impeller, turbine, and stator) inside and transmitting torque by internal working oil. The impeller is fixed to a front cover connected to the input rotor, and the hydraulic oil flowing from the impeller through the stator to the turbine transmits the torque transmitted from the impeller to the turbine to the output rotor connected to the turbine. Can be

The lock-up mechanism is disposed between the turbine and the front cover, and is for mechanically connecting the front cover and the turbine to directly transmit torque from the input-side rotating body to the output-side rotating body. Things. Normally, this lock-up mechanism includes a piston member that can be pressed against the front cover, a retaining plate fixed to the piston member, a coil spring supported by the retaining plate, and a spring member that elastically moves in the rotational direction by the coil spring. And a driven member that is electrically connected. The driven member is fixed to a turbine connected to the output side rotating body. The members constituting these lock-up mechanisms also constitute a lock-up damper for attenuating the inputted vibration.

When the lock-up mechanism operates, the piston member slides or presses against the front cover, and the torque is transmitted from the front cover to the piston member and transmitted to the turbine via the coil spring. At this time, the lock-up mechanism transmits torque and attenuates torsional vibration by the lock-up damper. Vibration is attenuated by the coil spring sliding with the retaining plate while repeating compression between the retaining plate fixed to the piston member and the driven member.

[0006]

In a conventional lock-up damper, a plurality of coil springs are arranged between a retaining plate and a driven member. Then, when transmitting a certain amount of torque or more, the stopper mechanism operates, and the relative rotation between the retaining plate and the driven member at a predetermined angle or more is prohibited. When a stop pin is provided as the stopper mechanism or when a stop pin cannot be used due to its structure, the coil spring is used as a stopper mechanism by using the coil spring until it comes into close contact.

However, when the coil spring is used as the stopper mechanism as described above, it is necessary to employ a coil spring having sufficient durability against the maximum torque load to be transmitted, and the range of choice of the coil spring is reduced. . As a result, the setting of the damper characteristic is restricted, and the cost of the coil spring increases. Particularly recently, there has been a demand for an improvement in the durability of the lock-up damper, and it is necessary to reduce the load applied to the coil spring.

An object of the present invention is to provide a lock-up damper for a torque converter, which is provided with a stopper mechanism for reducing the load applied to the coil spring, thereby expanding the range of choice of the coil spring in design and meeting the needs of vehicles. It is to facilitate setting of torsional characteristics and stopper torque.

[0009]

According to a first aspect of the present invention, there is provided a torque converter lock-up damper, which is included in a torque converter lock-up mechanism for mechanically transmitting torque from an input side rotating body to an output side rotating body. A lockup damper for attenuating vibration transmitted from an input-side rotating body to an output-side rotating body, comprising: an input-side member, an output-side member, a first elastic member, a second elastic member, and an intermediate member. I have.
Torque is input to the input side member from the input side rotating body.
The output side member outputs torque to the output side rotating body. The first elastic member is disposed between the input side member and the output side member. The second elastic member is disposed between the input side member or the output side member and the first elastic member. The intermediate member has a support portion and a locking portion. The support portion of the intermediate member is disposed between the first elastic member and the second elastic member, and supports the first and second elastic members in a circumferential direction. The locking portion of the intermediate member can be locked to at least one of the input side member and the output side member.

[0010] The torque transmitted from the input-side rotating body to the input-side member is transmitted to the first elastic member and the second elastic member that are connected in the circumferential direction via the support portion of the intermediate member. And
The torque is transmitted from the elastic member to the output side member and is output to the output side rotating body. The torsional vibration input to the lockup damper together with the torque is absorbed and attenuated by repeated compression of each elastic member, frictional sliding with another member, and the like.

Here, two elastic members are arranged in series via an intermediate member, and the lockup damper has a wide torsion angle characteristic. Accordingly, even when the elastic member is arranged on the outer peripheral portion of the torque converter in order to reduce the axial dimension of the torque converter, that is, when it is necessary to increase the compressible amount of the elastic member, the predetermined value can be obtained. Torsional angle characteristics can be secured.

Further, a locking portion is provided on the intermediate member of the lock-up damper according to the present invention, and this locking portion can be locked to at least one of the input side member and the output side member. It has a structure. Therefore, before the elastic member disposed between the intermediate member and the input-side member or the output-side member is completely compressed and brought into close contact, the intermediate member and the input-side member or the output-side member form the locking portion. That is, the locking portion serves as a stopper. As a result, at least one of the elastic members does not need to be used in a close contact state, that is, since this elastic member does not need to be used as a stopper, the range of selection of the elastic coefficient of the elastic member and the like can be expanded, It becomes easy to set the torsional characteristics and stopper torque as required.

According to a second aspect of the present invention, there is provided a lock-up damper for a torque converter according to the first aspect, wherein the input-side member has an input-side engaging portion that is engaged with an intermediate member. The output side member has an output side locking portion that locks to the intermediate member. Also, the first
The elastic coefficient of the elastic member is equal to the elastic coefficient of the second elastic member. The intermediate member has a first front locking portion, a first rear locking portion, a second front locking portion, and a second rear locking portion. The first front locking portion locks the input side locking portion from the front in the rotation direction of the torque converter. The first rear locking portion locks the input side locking portion from the rear in the rotation direction of the torque converter. The second front locking portion locks the output side locking portion from the front in the rotation direction of the torque converter. The second rear locking portion locks the output side locking portion from the rear in the rotation direction of the torque converter. In a state where no torque is applied to the input side rotating body and the output side rotating body, the distance between the input side locking section and the first front locking section, and the output side locking section and the second rear locking section. Is different from the distance. Further, the distance between the input side locking portion and the first rear locking portion and the distance between the output side locking portion and the second front locking portion are different.

Here, when the output side member rotates relative to the input side member in a direction opposite to the rotation direction of the torque converter, the first front locking portion is locked to the input side locking portion. The compression of the elastic member disposed between the input-side member and the intermediate member beyond a predetermined dimension can be prohibited. Also,
By locking the second rear locking portion to the output side locking portion,
Compression of the elastic member disposed between the output side member and the intermediate member beyond a predetermined dimension can be prohibited. When the output-side member rotates relative to the input-side member in the same direction as the rotation direction of the torque converter, the first rear locking portion is locked to the input-side locking portion, so that the input-side member and the intermediate member are rotated. Compression of a predetermined size or more of the elastic member disposed between the first and second members can be prohibited. In addition, since the second front locking portion is locked to the output side locking portion, compression of the elastic member disposed between the output side member and the intermediate member beyond a predetermined dimension can be prohibited.

As described above, when the input side member and the output side member rotate relative to each other in either direction, before the elastic member comes into close contact with each other, each of the locking portions is moved to the input side member or the output side member. To stop the relative rotation between the input-side member and the output-side member. And if it is not necessary to use the elastic member as a stopper, the selection range of the elastic member is widened, and various torsional characteristics can be easily set.
The stopper torque can be set by setting the structure and dimensions of the locking portion.

Although the first elastic member and the second elastic member having the same elastic modulus are used here, the torsional characteristics of the lockup damper in two stages are achieved. That is, when the output-side member rotates relative to the input-side member in a direction opposite to the rotation direction of the torque converter, the distance between the input-side locking portion and the first front locking portion, and the output-side locking portion Since the distance from the second rear locking portion is different, the two elastic members are compressed until one of the locking portions is locked, and then the other locking portion is locked, and the input side member and the second locking portion are locked. Until the output side member is integrated, only one elastic member continues to be compressed.
When the output-side member rotates relative to the input-side member in the same direction as the rotation direction of the torque converter, the distance between the input-side locking portion and the first rear locking portion, the output-side locking portion, and the second front locking portion. Since the distance from the locking portion is different, both elastic members are compressed until one of the locking portions is locked, and then the other locking portion is locked, and the input side member and the output side member are locked. Only one elastic member continues to be compressed until and are integrated. As a result, a lock-up damper using only an elastic member having one kind of elastic coefficient can obtain only one-stage torsional characteristic, but employs an intermediate member provided with the above-described locking portion. Thereby, a two-stage torsional characteristic is obtained.

According to a third aspect of the present invention, there is provided a lock-up damper for a torque converter, wherein the input-side member has an input-side locking portion for locking to an intermediate member. The output side member has an output side locking portion that locks to the intermediate member. Also, the first
The elastic coefficient of the elastic member is larger than the elastic coefficient of the second elastic member. The intermediate member has a first front locking portion, a first rear locking portion, a second front locking portion, and a second rear locking portion. The first front locking portion locks the input side locking portion from the front in the rotation direction of the torque converter. The first rear locking portion locks the input side locking portion from the rear in the rotation direction of the torque converter. The second front locking portion locks the output side locking portion from the front in the rotation direction of the torque converter. The second rear locking portion locks the output side locking portion from the rear in the rotation direction of the torque converter.

Here, when the output side member rotates relative to the input side member in a direction opposite to the rotation direction of the torque converter, the first front locking portion is locked to the input side locking portion. The compression of the elastic member disposed between the input-side member and the intermediate member beyond a predetermined dimension can be prohibited. Also,
By locking the second rear locking portion to the output side locking portion,
Compression of the elastic member disposed between the output side member and the intermediate member beyond a predetermined dimension can be prohibited. When the output-side member rotates relative to the input-side member in the same direction as the rotation direction of the torque converter, the first rear locking portion is locked to the input-side locking portion, so that the input-side member and the intermediate member are rotated. Compression of a predetermined size or more of the elastic member disposed between the first and second members can be prohibited. In addition, since the second front locking portion is locked to the output side locking portion, compression of the elastic member disposed between the output side member and the intermediate member beyond a predetermined dimension can be prohibited.

As described above, even when the input side member and the output side member rotate relative to each other in either direction, before the elastic member comes into close contact with each other, each of the locking portions is moved to the input side member or the output side member. To stop the relative rotation between the input-side member and the output-side member. If the elastic member is not used as the stopper, the selection range of the elastic member is widened and various torsional characteristics can be easily set, and the stopper torque can be set by setting the structure and dimensions of the locking portion.

Further, the first elastic member and the second elastic member having different elastic coefficients are employed, so that a two-stage torsion characteristic of the lock-up damper can be obtained. Furthermore, by arbitrarily setting the distance between each locking portion and the input-side locking portion or the output-side locking portion, the torsional characteristics are changed depending on the relative rotation direction between the input-side member and the output-side member. Various lock-up damper torsional characteristics can be set.

According to a fourth aspect of the present invention, there is provided a lock-up damper for a torque converter according to the second or third aspect, wherein the intermediate member includes an annular portion, a support portion, and a first notch portion. And a second notch. The support portion is provided on the annular portion,
The elastic member and the second elastic member are supported. The first notch portion is provided by notching the annular portion, and has a first front locking portion and a first rear locking portion at both ends. The second cutout portion is provided by cutting out the annular portion, and has a second front locking portion and a second rear locking portion at both ends.

Here, the intermediate member includes an annular portion, which prevents the intermediate member itself from being displaced to the outer peripheral side due to centrifugal force. Further, each locking portion is formed by providing a notch by cutting out the annular portion.
The lock-up damper for a torque converter according to claim 5 is the lock-up damper for a torque converter according to claim 2 or 3, wherein the intermediate member has an annular portion having a first opening and a second opening. , Support and the like. The first opening penetrates the annular portion in the axial direction of the torque converter, and a first front locking portion and a first rear locking portion are formed at both ends in the circumferential direction. The second opening penetrates the annular portion in the axial direction of the torque converter, and has second ends at both ends in the circumferential direction.
A front locking portion and a second rear locking portion are formed. The supporter supports the first and second elastic members. The input side locking portion is inserted into the first opening. The output side locking portion is inserted into the second opening.

Here, the intermediate member includes an annular portion, and the intermediate member itself is prevented from being displaced to the outer peripheral side due to centrifugal force. Further, each locking portion is formed by providing an opening in the annular portion. The lock-up damper for a torque converter according to claim 6 is configured as described above.
In the lock-up damper for a torque converter according to any one of the above, when no torque is applied to the input side rotating body and the output side rotating body, the distance between the first front locking portion and the input side locking portion. The larger of the distance between the first elastic member and the second rear locking portion and the distance between the output-side locking portion,
It is smaller than the allowable deformation amount of one of the elastic members. The smaller of the distance between the first front locking portion and the input side locking portion and the distance between the second rear locking portion and the output side locking portion is determined by the first elastic member and the second elastic member. It is smaller than the allowable deformation of the other elastic member of the member. The larger of the distance between the first rear locking portion and the input locking portion and the distance between the second front locking portion and the output locking portion is determined by the first elastic member and the second elastic member. Is smaller than the allowable deformation amount of one of the elastic members. The smaller of the distance between the first rear locking portion and the input side locking portion and the distance between the second front locking portion and the output side locking portion corresponds to the first elastic member and the second elastic member. Is smaller than the allowable deformation amount of the other elastic member.

Here, when the output member rotates relative to the input member in a direction opposite to the rotation direction of the torque converter, the torque is not applied to the input rotor and the output rotor. The larger of the distance between the first front locking portion and the input side locking portion and the distance between the second rear locking portion and the output side locking portion is the distance between the first elastic member and the second elastic member. When the first front locking portion is locked to the input locking portion or the second rear locking portion is locked to the output locking portion, the one elastic member is smaller than the allowable deformation amount of one of the elastic members. The member does not compress beyond the allowable deformation. Further, the distance between the first front locking portion and the input locking portion in a state where no torque is applied to the input side rotating body and the output side rotating body, and the distance between the second rear locking portion and the output side locking portion. Since the smaller one of the distances is smaller than the allowable deformation amount of the other elastic member of the first elastic member and the second elastic member, the first front locking portion serves as the input side locking portion. Alternatively, when the second rear locking portion is locked to the output side locking portion, the other elastic member does not compress more than the allowable deformation amount. On the other hand, when the output-side member rotates relative to the input-side member in the same direction as the rotation direction of the torque converter, the first rear locking in a state where no torque acts on the input-side rotating body and the output-side rotating body. The larger of the distance between the portion and the input side locking portion and the distance between the second front locking portion and the output side locking portion is one of the first elastic member and the second elastic member. Is smaller than the allowable deformation amount, one elastic member is allowed to deform when the first rear locking portion is locked to the input locking portion or the second front locking portion is locked to the output locking portion. No more compression. The smaller of the distance between the first rear locking portion and the input side locking portion and the distance between the second front locking portion and the output side locking portion is determined by the first elastic member and the second elastic member. Since the amount of deformation of the other elastic member is smaller than the allowable deformation amount of the other, the first rear locking portion is locked to the input locking portion or the second front locking portion is locked to the output locking portion. Does not compress more than the allowable deformation amount.

From the above, in any case, it is possible to avoid applying a severe load to the elastic member in terms of durability strength such that the elastic member is brought into close contact with the elastic member, and the range of choice of the elastic member is widened. The lock-up damper for a torque converter according to claim 7 is the lock-up damper for torque converter according to claim 1, wherein the first elastic member has a larger elastic coefficient than the second elastic member. Then, the locking portion of the intermediate member is locked to the input side member or the output member so as to suppress the deformation of the second elastic member beyond the allowable deformation amount.

Here, the second elastic member often has a small elastic coefficient and a lower durability than the first elastic member.
The second elastic member disposed between the intermediate member and the input-side member or the output member is compressed by the locking portion of the intermediate member to the input-side member or the output member, so that the compression can be performed with a durable strength. Compression is not performed beyond the deformation amount. Thereby, the range of selection of the elastic coefficient and the like of the second elastic member is widened.

On the other hand, the first elastic member has a relatively high strength as compared with the second elastic member and transmits torque in a close contact state, that is, is used as a stopper for relative rotation between the input side member and the output side member. It is also possible.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] The torque converter 1 shown in FIG. 1 includes a front cover 3, a torque converter main body composed of an impeller 4, a turbine 5 and a stator (not shown), and a lock-up mechanism 8. .

The front cover 3 and the shell of the impeller 4 form a hydraulic oil chamber filled with hydraulic oil. Since the impeller 4, the turbine 5, and the stator (not shown) have the same structure as the conventional one, detailed description is omitted. The shell of the turbine 5 has an inner peripheral portion fixed to the turbine hub 6 by rivets 24. The turbine hub 6 is spline-engaged with a shaft (not shown) extending from the transmission side.

The lock-up mechanism 8 includes the front cover 3
From the turbine 5 and the turbine hub 6
And a mechanism for attenuating the input vibration. The lock-up mechanism 8 mainly includes an input-side piston member 9 and an output-side driven member 10.
And four coil springs 13 as elastic members, a retaining plate 14 as an input-side member, and an intermediate member 30.

The piston member 9 is a member that approaches or separates from the front cover 3 by controlling the hydraulic pressure in the torque converter body. The piston member 9 is a disk-shaped member, and has an outer cylindrical portion 9a and an inner cylindrical portion 9b. Outer cylinder 9a and inner cylinder 9
b extends to the transmission side (the right side in FIG. 1). The inner peripheral cylinder portion 9b is supported on the outer peripheral surface of the turbine hub 6 so as to be relatively rotatable and movable in the axial direction. In the clutch disengaged state, the inner peripheral cylindrical portion 9b abuts on the turbine hub 6 and can move only in the axial direction toward the front cover 3 side. Further, a disc-shaped friction facing 20 is fixed to the outer peripheral side surface of the piston member 9 at a position facing the friction surface of the front cover 3.

The retaining plate 14 is a member mainly for holding the coil spring 13 on the piston member 9 side. The retaining plate 14 is disposed inside the outer peripheral cylindrical portion 9 a of the piston member 9. The retaining plate 14 has an outer curved portion 16 having an arc-shaped cross section. The outer peripheral surface of the outer peripheral bent portion 16 is an outer peripheral cylindrical portion 9a.
Is in contact with the inner peripheral surface of the A position where the outer curved portion 16 is divided into two at equal intervals in the circumferential direction (a position facing the radial direction).
Are formed with circumferential support portions 17a and 17b which bend and protrude toward the inner peripheral side and the transmission side, respectively. In addition, a fixing portion 18 extends inward from the circumferential support portions 17a and 17b. The fixing portion 18 extends in a circumferential direction at a predetermined angle, and is fixed to the piston member 9 by three rivets 21. Further, an input side locking portion 19 extending from the fixed portion 18 to the transmission side is provided on the inner peripheral side of the circumferential direction supporting portions 17a and 17b. The radial position of the input side locking portion 19 corresponds to the radial position of a first notch 33 of the intermediate member 30 described later.

The driven member 10 is an annular plate member, and is fixed to the outer periphery of the shell of the turbine 5 by welding. Two support portions 11 protrude from the outer peripheral end of the driven member 10 toward the engine. The support part 11
Circumferential support portions 17a, 1 of retaining plate 14
7b. Further, two output side locking portions 12 protrude from the inner peripheral end of the driven member 10 toward the engine. The radial position of the output side locking portion 12 corresponds to the radial position of a second notch portion 34 of the intermediate member 30 described later.

The coil spring 13 is a member for transmitting torque in the lock-up mechanism 8 and for absorbing and attenuating minute torsional vibrations caused by engine speed fluctuations and vibrations caused by shocks when the clutch is engaged. The coil spring 13 includes the retaining plate 1
4, the piston member 9 and the driven member 10 are elastically connected in the rotational direction. As shown in FIG. 2, first and second coil springs 13A and 13B are arranged on one of the circumferential support portions 17a and 17b and one side between the support portion 11 and the other. A third coil spring 13C and a fourth coil spring 13D are disposed on one of the circumferential support portions 17a and 17b and the other side between the support portion 11 and the other.

The first coil spring 13A and the second coil spring 13B, and the third coil spring 13C and the fourth coil spring 13D are arranged in series with a spring support 32 of the intermediate member 30 described later interposed therebetween. That is, as a whole, the first and third coil springs 13
A, 13C and second and fourth coil springs 13B, 13D
And a wide torsion angle characteristic can be obtained.

The intermediate member 30 restricts the movement of the coil springs 13 to the outer peripheral side by connecting the coil springs 13 to each other in the radial direction.
9 or the output side locking portion 12 serves as a stopper for the relative rotation between the piston member 9 and the retaining plate 14 as the input side member and the driven member 10 as the output side member. This intermediate member 30
Are mainly formed by an annular plate 31, a spring support portion 32 provided on a protruding portion 31a projecting from the annular plate 31 to the outer peripheral side, and first and second notches formed by notching the annular plate 31. And 33 and 34.

The annular plate 31 includes the coil spring 1
On the inner peripheral side of 3, the retaining plate 14 and the turbine 5 are disposed so as to be relatively rotatable between the retaining plate 14 and the turbine 5 in the axial direction. The spring support portion 32 is mounted on a protruding portion 31 a that protrudes outward from two locations facing the radial direction of the annular plate 31. One of the spring support portions 32 is disposed between the first coil spring 13A and the second coil spring 13B, and the other is disposed between the third coil spring 13C and the fourth coil spring 13D. And
The spring support portion 32 fits into the end of the coil spring 13, supports the end of the coil spring 13, and connects the two coil springs 13A, 13B and 13C, 13D in series. Further, since the spring support portion 32 is fixed to the annular plate 31, both the coil springs 13A and 13B and the
The movement of the connecting portion between C and 13D to the outside in the radial direction is restricted.

The first notch 33 is provided by cutting the outer peripheral portion of the annular plate 31 at two circumferential positions of the intermediate member 30. Further, both end surfaces of the first cutout portion 33 are a first front locking portion 33a and a first rear locking portion 33b which are locked to the input side locking portion 19. First front locking portion 33
a is an end surface of the first cutout portion 33 in the rotation direction front of the torque converter 1. The first front locking portion 33b is an end surface of the first cutout portion 33 on the rear side in the rotation direction of the torque converter 1. The input side locking portion 19 of the retaining plate 14 is disposed in the first notch 33.

The second notches 34 are formed by cutting the inner peripheral portion of the annular plate 31 at two circumferential positions of the intermediate member 30. Further, both end surfaces of the second cutout portion 34 serve as a second front locking portion 34a and a second rear locking portion 34b which are locked to the output side locking portion 12. Second front locking portion 34
a is an end surface of the second cutout portion 34 in the rotation direction front of the torque converter 1. The second front locking portion 34b is an end surface of the second cutout portion 34 on the rear side in the rotation direction of the torque converter 1. The output side locking portion 12 of the driven member 10 is arranged in the second cutout portion 34.

FIG. 3 is a schematic view of main members constituting a lock-up damper included in the lock-up mechanism 8. FIG. 3 shows a state in which no torque acts on the piston member 9 and the driven member 10 to which the retaining plate 14 is fixed.
The distance (s1) from the front locking portion 33a is the output locking portion 1
2 is shorter than the distance (s2) between the second rear locking portion 34b. Further, the distance between the input side locking part 19 and the first rear locking part 33b is shorter than the distance between the output side locking part 12 and the second front locking part 34a.

Next, the operation will be described. When the hydraulic oil between the front cover 3 and the piston member 9 is drained from the shut-off state of the lock-up mechanism 8, the piston member 9 moves to the front cover 3 side, and as a result, the friction facing 20 causes the friction of the front cover 3 to move. Adhere to the surface. Thus, the torque of the front cover 3 is transmitted to the piston member 9 and further transmitted to the turbine 5 via the retaining plate 14, the coil spring 13, and the driven member 10. Further, the torque is output from a turbine hub 6 to a shaft (not shown) extending from the transmission side. The direction of the input torque, that is,
The rotation direction of the torque converter 1 is the direction of R2 in FIG.

When a small torsional vibration is input to the front cover 3 during the lock-up connection, the piston member 9 and the driven member 10 rotate relative to each other periodically, and the coil spring 13 expands and contracts in the circumferential direction. . Here, the small torsional vibration is effectively absorbed by the wide torsion angle characteristic of the coil spring 13. Further, when compressed, the coil spring 13 tends to protrude radially outward and moves radially outward due to centrifugal force. However, the connected coil spring 13 (first coil spring 13A)
And the third coil spring 13B, and the third coil spring 13C and the fourth coil spring 13D) are hardly moved radially outward because the connecting portions are supported by the spring support portions 32. As a result, frictional sliding is less likely to occur between the coil spring 13 and the outer bent portion 16. That is, the frictional resistance generated between the coil spring 13 and the outer bent portion 16 is reduced, and the coil spring 13 can effectively absorb the small torsional vibration.

At the time of lock-up connection or disconnection, a relatively large torsional vibration occurs due to a shock or the like. At this time, the piston member 9 and the driven member 10
And attenuate the vibration by repeating the relative rotation largely in both rotation directions. The torque difference between the piston member 9 and the driven member 10 causes the piston member 9 and the retaining plate 14
Starts rotating relative to the driven member 10 in the direction of R2 in FIG. 2, the circumferential support portions 17a and 17b are connected to the connected coil springs 13 (13A and 13B and 13C and 1C).
Push the end in the rotation direction of 3D) (see FIG. 3). The forward end of the connected coil spring 13 in the rotation direction is supported by the support portion 11 of the driven member 10, and the coil spring 13 is compressed. As the coil spring 13 rotates, the coil springs 13 are compressed, so that the driven member 10
, The piston member 9 and the retaining plate 1
4 rotates, and the intermediate member 30 is rotated by the difference between the amount of rotation and the amount of compression of the second and fourth coil springs 13B and 13D.
Also rotates. When the input side locking portion 19 of the retaining plate 14 is locked to the first front locking portion 33a of the intermediate member 30, thereafter, the piston member 9 and the retaining plate 14 and the intermediate member 30 are integrated. , With respect to the driven member 10. And after this, the 2nd and 4th
The coil springs 13B and 13D are not compressed,
Since only the three coil springs 13A and 13C continue to be compressed, the damper characteristics change (change from the first stage on the R2 side to the second stage on the R2 side in FIG. 4). When further rotated, the second rear locking portion 34b of the intermediate member 30 is locked to the output locking portion 12 of the driven member 10. This allows
The rotation direction (R2) of the piston member 9, the retaining plate 14, and the driven member 10 via the intermediate member 30
Therefore, relative rotation between the piston member 9 and the retaining plate 14 and the driven member 10 is prohibited (transition to the stopper from the second stage on the R2 side in FIG. 4). That is, as shown in FIG. 4, the intermediate member 30 generates a two-stage damper characteristic and also serves as a stopper. Here, the angle of the relative rotation between the driven member 10 and the piston member 9 and the retaining plate 14 on the R2 side on which the stopper is applied is determined by the input side locking portion 19 and the first front locking portion 33a.
The product of π and the sum of the distance (s1) between the output member 12 and the distance (s2) between the output side locking portion 12 and the second rear locking portion 34b and the intermediate member 3
It is the value divided by the circumference of 0. On the other hand, when the piston member 9 and the retaining plate 14 rotate in the direction of R1 in FIG. 2 with respect to the driven member 10, the reverse phenomenon occurs, and the input side locking portion 19 is moved to the first rear side. Locking part 3
When locked to 3b, the first and third coil springs 13A and 13C are not compressed thereafter, so that the damper characteristic changes (change from the first stage on the R1 side to the second stage on the R1 side in FIG. 4). When further rotated, the second front locking portion 3
4a is locked to the output side locking portion 12, and the relative rotation between the piston member 9 and the retaining plate 14 and the driven member 10 is prohibited (shift to the stopper from the second stage on the R1 side in FIG. 4).

As described above, the lock-up damper of the lock-up mechanism 8 has a wide range of torsional characteristics and has two-stage torsional characteristics. Therefore, torsional vibration can be efficiently absorbed and attenuated. In the above embodiment, even when the coil spring 13 is arranged on the outer peripheral portion of the torque converter 1 and the lock-up damper is formed in a narrow space of the outer peripheral portion, the intermediate member 1 is also used.
3 has a stopper mechanism, so that the structure is established. Further, the coil spring 13 is not used as a stopper, and the position of each locking portion is determined so that the coil spring 13 is not compressed more than an allowable compression amount. Thereby, the durability of the coil spring 13 is ensured. Further, by changing the range of the cutout of the intermediate member 13, a front portion and a rear portion of the input locking portion 19 in the rotation direction of the torque converter 1, a front portion of the output locking portion 12 in the rotation direction of the torque converter 1, and The timing of locking to each part of the rear part can be set arbitrarily, and it is possible to select variously the damper characteristics of the lock-up damper. Here, the damper characteristic when the direction of rotation of the piston member 9 with respect to the driven member 10 is the direction of positive rotation of the torque converter 1 is designed to be different from the damper characteristic when the direction of rotation is negative. That is, the point at which the damper characteristic changes and the relative rotation amount applied to the stopper are designed to be different between the two. Second Embodiment FIGS. 5 to 7 show a lock-up mechanism 41 of a torque converter including a lock-up damper as one embodiment of the present invention. An engine (not shown) is arranged on the left side of FIGS. 6 and 7, and a transmission (not shown) is arranged on the right side of FIGS. FIG. 5 is a partial cross-sectional view of the lock-up mechanism 41 excluding a driven plate 45 described below, as viewed from the transmission side. In the rotation direction shown in FIG. 5, the rotation direction (direction) R2 is the positive rotation direction of the engine and the torque converter, and the rotation direction (direction) R1 is the negative rotation direction.

Since the torque converter has a general structure, a detailed description is omitted here. In FIG. 6, a front cover 90 (input side rotating body) of the torque converter is shown.
And a turbine 92 (output side rotating body). The front cover 90 is a member connected to the crankshaft of the engine, and forms a hydraulic oil chamber of the torque converter together with an impeller (not shown). A flat annular friction surface 91 is formed on the inner wall surface on the outer peripheral side of the front cover 90. The turbine 92 is an impeller that is axially opposed to an impeller (not shown), and mainly includes a turbine shell 93 and a plurality of turbine blades 94 fixed to the turbine shell 93. An inner peripheral portion of the turbine shell 93 is connected to a main drive shaft (not shown) of the transmission via a turbine hub.

The lock-up mechanism 41 mechanically transmits torque from the front cover 90 to the turbine 92,
This is a mechanism for absorbing and attenuating the input torsional vibration. That is, the lockup mechanism 41 has a clutch function and a damper function (lockup damper). The lockup mechanism 41 is arranged in a space between the front cover 90 and the turbine 92, as shown in FIG. The lock-up mechanism 41 mainly includes the piston 4
2 and the drive plate 43, an output member mainly comprising the driven plate 45, and first and second coil springs (first and second coil springs) disposed between the input member and the output member. (Second elastic members) 47 and 48 and an intermediate plate (intermediate member) 44.

The input side member includes a piston 42 and a drive plate 43. The piston 42
A clutch member that approaches or separates from the front cover 90 by controlling the hydraulic pressure in the torque converter body. The piston 42 is a disk-shaped member, and has an inner peripheral protruding portion 51 and an outer peripheral protruding portion 52. The inner peripheral protruding portion 51 and the outer peripheral protruding portion 52 are cylindrical portions protruding toward the transmission. The inner peripheral projection 51 is supported on the outer peripheral surface of a turbine hub (not shown) so as to be relatively rotatable and movable in the axial direction. A disk-shaped friction facing 42a facing the friction surface 91 of the front cover 90 is provided on a side surface of the piston 42 on the engine side.
Has been fixed.

The drive plate 43 is a member that is fixed to the piston 42 and supports the first and second coil springs 47 and 48 in the rotational direction. The drive plates 43 are arranged at four positions at equal intervals in the rotation direction on the engine-side outer peripheral portion of the piston 42 (the inner peripheral side of the outer cylindrical portion 52). Drive plate 43 is shown in FIGS.
As shown in FIG. 9, a fixed portion 53 and an inner peripheral convex portion 54 extending from the outer peripheral portion of the fixed portion 53 to the transmission side.
An outer peripheral concave portion 55 extending radially outward from the inner peripheral convex portion 54 and recessed toward the engine; an outer peripheral engaging portion 56 further extending radially outward from the outer peripheral concave portion 55;
3 is formed by cutting and bending the central portion in the circumferential direction of the transmission 3 and extending to the transmission side. Inner peripheral convex portion 54, outer peripheral concave portion 55, and outer peripheral engaging portion 56
Means the first and second coil springs 47 and 4 respectively.
The first and second spring seats 70, 71, which will be described later, attached to the end surface of the inner surface 8 can be in contact with the inner peripheral portion, the radially intermediate portion, and the outer peripheral portion. The fixing portion 53 has a hole through which the rivet 50 passes. The drive plate 43 is fixed to the piston 42 by rivets 50 and functions as a member on the input side. The inner peripheral convex portion 54, the outer peripheral concave portion 55, and the outer peripheral engaging portion 56 are connected to the first and second coil springs 4 via the first and second spring seats 70 and 71.
Since the end faces of the first and second coil springs 47 and 4 are supported at a plurality of different positions in the radial direction, the first and second coil springs 47 and 4 are supported.
The support at the end of 8 is stable. The outer peripheral surface of the outer peripheral engaging portion 56 is in contact with the inner peripheral surface of the outer peripheral projecting portion 52 of the piston 42. This facilitates the positioning of the drive plate 43 and suppresses the radial deformation of the drive plate 43 outward. FIG. 5 shows the input side locking portion 57.
6, as shown in FIG. 6, it is arranged in a first opening 62 of an intermediate plate 44 described later.

First and second coil springs 47 and 48
Are connected to each other via an intermediate plate 44 to form a set, and are provided at four locations at equal intervals in the rotational direction so that four sets of first and second coil springs 47 and 48 operate in parallel. It has become. The first coil spring 47 has higher rigidity than the second coil spring 48.
Thereby, the lock-up damper has a two-stage torsional characteristic. The first coil springs 47 of the respective sets sandwich the intermediate support portion 61 of the intermediate plate 44 therebetween, and rotate in the forward rotation direction R with respect to the second coil springs 48.
It is arranged on two sides. A first spring seat 70 is provided at the end of the first coil spring 47 on the positive rotation direction R2 side. The first spring seat 70 includes a disc-shaped support portion and an engagement portion extending from the support portion into the coil spring. The back surface of the support portion of the first spring seat 70 is supported by the inner peripheral convex portion 54, the outer peripheral concave portion 55, and the outer peripheral engagement portion 56 of the drive plate 43 or a spring support portion 45b of the driven plate 45 described later (see FIG. 6). . A second spring seat 71 is provided at an end of the second coil spring 48 on the negative rotation direction R1 side. The second spring seat 71 has a structure similar to that of the first spring seat 70, and is also supported by the drive plate 43 or the driven plate 45.

The intermediate plate 44 is an intermediate member that operates between the first coil spring 47 and the second coil spring 48, and has a ring (annular portion) 60.
, An intermediate support portion (support portion) 61, and a first opening portion 62 and a second opening portion 63 provided at a substantially central portion in the radial direction of the ring 60. The intermediate support portion 61 is disposed between the end of the first coil spring 47 on the negative rotation direction R1 side and the end of the second coil spring 48 on the positive rotation direction R2, and is located between the first and second coil springs 47, 48. Enables torque transmission. First and second protruding portions 61a, 61 protruding in the rotation direction on both sides in the rotation direction of the intermediate support portion 61.
b is formed. First and second protrusions 61a, 61b
Are inserted inside the first coil spring 47 and inside the second coil spring 48, respectively. The four intermediate supports 61 are connected to each other by a ring 60. Thereby, the movement of each intermediate support portion 61 outward in the radial direction is restricted. As a result, the first coil spring 4
The movement of the end of the second coil spring 48 in the negative rotation direction R1 and the end of the second coil spring 48 in the positive rotation direction R2 to the outside in the radial direction is restricted.

As shown in FIG. 5, the first opening 62 and the second opening 63 are formed at substantially four central portions of the ring 60 at equal intervals in the circumferential direction. The first opening 62 is provided at a position facing the drive plate 43, and the input side locking portion 57 of the drive plate 43 penetrates (see FIG. 6). As shown in FIGS. 5 and 10, a first front locking portion 62 a and a first rear locking portion 62 b in which both circumferential end surfaces of the first opening 62 are locked to the input locking portion 57. Has become. The first front locking portion 62a is
This is an end face of the opening 62 in front of the torque converter 1 in the rotation direction R2. The first rear locking portion 62b is provided with a first opening 62.
3 is an end face of the torque converter 1 in the rotation direction R2 rearward.

The second opening 63 is located on the inner peripheral side of the intermediate support portion 61, and the output side engaging portion 45c of the driven plate 45 described later penetrates (see FIG. 7). Both circumferential end surfaces of the second opening 63 are a second front locking portion 63a and a second rear locking portion 63b which are locked to the output side locking portion 45c. The second front locking portion 63a is an end surface of the second opening 63 in the rotation direction R2 front of the torque converter 1. The second rear locking portion 63b is an end surface of the second opening 63 rearward in the rotation direction R2 of the torque converter 1.

The output side member comprises a driven plate 45 and a support ring 46. The dry plate 45 is a member fixed to the turbine shell 93 of the turbine 92, and as shown in FIG.
And four spring support portions 45b formed on the outer peripheral side of the annular portion 45a, and four output locking portions 45c formed on the inner peripheral side of the annular portion 45a. Annular part 45
a is welded to the turbine shell 93. The spring support portion 45b extends from the annular portion 45a to the engine side,
It is inserted between one set of the first and second coil springs 47 and 48 and another set of the adjacent first and second coil springs 47 and 48. The spring support portion 45b extends into the outer peripheral concave portion 55 of the drive plate 43, and both ends in the rotation direction are in contact with the first and second spring seats 70, 71. The output-side support portion 45c extends from the annular portion 45a to the engine side, and the second side of the intermediate plate 44
It penetrates the opening 63 (see FIG. 7).

The support ring 46 is an annular plate member made of sheet metal. The support ring 46 mainly includes a cylindrical portion 65 and a disk-like portion 6 extending from the transmission-side end of the cylindrical portion 65 to the inner peripheral side.
6 is comprised. On the inner peripheral edge of the disk-shaped portion 66,
Notch engaging portions 67 are formed at four locations at equal intervals in the rotation direction. The spring supporting portion 45b of the driven plate 45 is inserted and engaged in the notch engaging portion 67.
As a result, the support ring 46 is
It rotates together with 5. The spring support 45
The engagement between the b and the notch engaging portion 67 is detachable in the axial direction, and the ease of assembly is taken into consideration. In the portion where the notch engaging portion 67 is formed, a part of the disk-shaped portion 66 is spring-contacted to a transmission-side bent portion 68.
It has become. The spring contact portion 68 is in contact with the first spring seat 70 and the second spring seat 71. The cylindrical portion 65 is disposed on the inner peripheral side of the outer peripheral projection 52 so as to cover the outer periphery of the first and second coil springs 47 and 48. The cylindrical portion 65 is close to the outer peripheral protruding portion 52 of the piston 42, but a gap is secured between them. The cylindrical portion 65 includes the first and second coil springs 4.
By covering the outer peripheral sides of 7, 48, these are prevented from jumping outward in the radial direction.

Next, the operation will be described. The torque of the engine-side crankshaft is input to the front cover 90 via a flexible plate (not shown). This torque is transmitted to an impeller (not shown). When the impeller rotates, the operating oil flows toward the turbine 92, and rotates the turbine 92. The torque of the turbine 92 is output to a main drive shaft via a turbine hub (not shown).

When the speed ratio of the torque converter increases and the main drive shaft reaches a predetermined rotational speed, the hydraulic oil between the piston 42 and the front cover 90 is drained through the inside of the main drive shaft. As a result,
The piston 42 is pressed against the friction surface 91 of the front cover 90 due to the oil pressure difference. Thus, the torque of the front cover 90 is transmitted to the turbine 92 via the lock-up mechanism 41. That is, the front cover 90 and the turbine 92 are mechanically connected, and the torque of the front cover 90 is directly output to the main drive shaft without passing through the impeller. In the lock-up connection state, the first and second coil springs 47, 4 in which the drive plate 43 is connected by the intermediate plate 44.
8 in the forward rotation direction R2, and the first coil spring 47
Presses the spring support portion 45b of the driven plate 45 and the spring contact portion 28 of the support ring 46. Thereby, torque is transmitted from the piston 42 to the driven plate 45.

In the lock-up connection state, the lock-up mechanism 41 transmits torque and absorbs and attenuates torsional vibration input from the front cover 90. Specifically, the first coil spring 47 and the second coil spring 48 expand and contract between the drive plate 43 and the driven plate 45, thereby absorbing and attenuating torsional vibration. This will be described with reference to FIG. 10 which is a schematic view of the lock-up mechanism 41.

When the driven plate 43 fixed to the piston 42 starts rotating in the direction R2 of FIG. 10 with respect to the driven plate 45 due to the torque difference between the piston 42 and the driven plate 45, the driven plate 43 1. Push the end of the second coil springs 47, 48 at the rear in the rotation direction R2. Since the ends of the first and second coil springs 47 and 48 in the rotation direction R2 front are supported by the spring support portions 45b of the driven plate 45, the first and second coil springs 47 and 48 are compressed. As it rotates, the first and second coil springs 4
Since the drive plates 43 rotate relative to the driven plate 45, the intermediate plate 44 is rotated by the difference between the amount of rotation and the amount of compression between the first coil spring 47 and the second coil spring 48. Also rotates.

Input side locking portion 57 of drive plate 43
Is the first opening 62 of the intermediate plate 44
After that, the drive plate 43 and the intermediate plate 4
4 integrally rotate with respect to the driven plate 45 (the spring locking portion 45b, the output locking portion 45c, etc.). Thereafter, since the second coil spring 48 is not compressed and only the first coil spring 47 is continuously compressed, the damper characteristic changes (R in FIG. 4).
Change from the first stage on the second side to the second stage on the R2 side).

As the rotation further proceeds, the second rear locking portion 6 of the second opening 63 of the intermediate plate 44
3b is locked to the output side locking portion 45c of the driven plate 45. As a result, the drive plate 43 and the driven plate 45 are integrated with each other in the rotation direction (R2) via the intermediate plate 44, so that the relative rotation between the drive plate 43 and the driven plate 45 is prohibited (FIG. 4). From the second stage on the R2 side to the stopper). That is, as shown in FIG. 4, the intermediate plate 44 generates a two-stage damper characteristic and also serves as a stopper.

In this case, the R acting on the stopper
The angle of the relative rotation between the drive plate 43 and the driven plate 45 on the second side is determined by the distance (s1) between the input locking portion 57 and the first front locking portion 62a, the output locking portion 45c, and the second locking angle.
This is a value obtained by dividing the product of π and the sum of the distance (s2) to the rear locking portion 63b and the circumference of the intermediate plate 44.

On the other hand, when the drive plate 43 rotates relative to the driven plate 45 in the direction of R1 in FIG.
Is locked to the first rear locking portion 62b, the damper characteristics change thereafter (R1 from the R1 side first stage in FIG. 4).
Change to the second stage on the first side). With further rotation, the second front locking portion 63a locks to the output side locking portion 45c, and the relative rotation between the drive plate 43 and the driven plate 45 is prohibited (two steps on the R1 side in FIG. 4). Move from eye to stopper).

As described above, the lock-up damper of the lock-up mechanism 41 has wide torsion characteristics and
It has a graded torsional characteristic. Therefore, torsional vibration can be efficiently absorbed and attenuated. [Other Embodiments] In the first embodiment, the coil springs 13 having the same elastic coefficient are employed. For example, the first and third coil springs 13A and 13C have large elastic coefficients at the positions thereof. By using a material, a material having a small elastic coefficient can be used at the position of the second coil spring 13B and the fourth coil spring 13D. In this case, first, a spring having a small elastic coefficient is compressed between the piston member 9 and the intermediate member 30, and the members 9, 30 are integrated, and then the members 9, 3 are integrated.
A spring having a large elastic coefficient is compressed between the zero and the driven member 10. Thus, by using a combination of springs having different elastic coefficients, it becomes easy to set a damper characteristic suitable for the vehicle. In this case, it is necessary to correspond the arrangement of the first and second notches 33 and 34 and the notch range.

When a spring having a large elastic coefficient is employed, a large torque can be transmitted in a state where the spring is completely compressed and brought into close contact with each other, and when the spring has sufficient durability, this spring is used. Can also be used as a stopper. In other words, in such a case, only a spring having a small elastic coefficient having poor durability is applied so that a large torque is not applied.
The protection may be performed by locking the intermediate member 30 to the input side locking portion 19 or the output side locking portion 12.

[0065]

According to the present invention, in the lock-up damper of the torque converter, an intermediate member having a locking portion is provided so that the intermediate member can be locked to the input side member or the output side member. Can be reduced, the range of selection of the elastic member in the design can be widened, and the setting of the torsional characteristics and the stopper torque according to the needs of the vehicle can be facilitated.

The compression timing of the two elastic members arranged in series via the intermediate member can be combined by the arrangement of the locking portions of the intermediate member. It is possible to provide a stepped characteristic or to provide a characteristic difference depending on the rotation direction.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view of an acute angle of a torque converter as one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a schematic view of a lock-up damper.

FIG. 4 is a torsion angle characteristic diagram of a lock-up damper.

FIG. 5 is a schematic longitudinal sectional view of a lock-up mechanism according to a second embodiment.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

FIG. 8 is a plan view of a driven plate according to a second embodiment.

FIG. 9 is a plan view of a drive plate according to a second embodiment.

FIG. 10 is a schematic view of a lock-up damper according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque converter 3 Front cover (input side rotating body) 5 Turbine (output side rotating body) 8 Lockup mechanism 9 Piston member (input side member) 10 Driven member (output side member) 12 Output side locking part 13 Coil spring ( 14 Elastic member) 14 Retaining plate (input side member) 19 Input side locking portion 30 Intermediate member 31 Annular plate (annular portion) 32 Spring support portion (support portion) 33 First notch portion 33a First front locking portion 33b First rear locking portion 34 Second notch portion 34a Second front locking portion 34b Second rear locking portion

Claims (7)

[Claims] 1. A torque, which is included in a lock-up mechanism of a torque converter for mechanically transmitting torque from an input side rotating body to an output side rotating body, attenuates vibration transmitted from the input side rotating body to the output side rotating body. A lock-up damper for a converter, wherein an input-side member to which torque is input from the input-side rotator, an output-side member that outputs torque to the output-side rotator, the input-side member and the output-side member, A first elastic member disposed between the first elastic member and the second elastic member disposed between the input side member or the output side member and the first elastic member; A support portion disposed between the first and second elastic members and supporting the first and second elastic members in a circumferential direction, and a locking portion capable of locking to at least one of the input side member and the output side member. And having The torque converter lock-up damper comprising a member. 2. The input-side member has an input-side locking portion that locks to the intermediate member; the output-side member has an output-side locking portion that locks to the intermediate member; The elastic member has an elastic coefficient equal to the elastic coefficient of the second elastic member, and the intermediate member has a first front locking portion that locks the input side locking portion from the front in the rotation direction of the torque converter. A first rear locking portion that locks the input side locking portion from the rear side in the rotation direction of the torque converter, and a second front side locking the output side locking portion from the front side in the rotation direction of the torque converter. A locking portion, and a second rear locking portion for locking the output side locking portion from a rear side in a rotational direction of the torque converter, wherein torque acts on the input side rotating body and the output side rotating body. The input side engaging portion and the first
The distance between the front locking portion and the distance between the output locking portion and the second rear locking portion is different, and the distance between the input locking portion and the first rear locking portion is different from the distance between the input locking portion and the first rear locking portion. The lock-up damper for a torque converter according to claim 1, wherein a distance between an output side locking portion and the second front locking portion is different. 3. The input-side member has an input-side locking portion that locks to the intermediate member; the output-side member has an output-side locking portion that locks to the intermediate member; An elastic member having an elastic coefficient greater than that of the second elastic member; the intermediate member; a first front locking portion that locks the input side locking portion from the front in the rotation direction of the torque converter; A first rear locking portion that locks the input locking portion from the rear side in the rotation direction of the torque converter; and a second front locking portion that locks the output side locking portion from the front in the rotation direction of the torque converter. 2. The lock-up damper for a torque converter according to claim 1, further comprising a portion, and a second rear locking portion that locks the output side locking portion from a rear side in a rotational direction of the torque converter. 3. 4. The intermediate member includes an annular portion, a support portion provided on the annular portion for supporting the first and second elastic members, and a first portion provided at both ends by notching the annular portion. A first notch in which a front locking portion and the first rear locking portion are formed, and the second front locking portion and the second rear locking portion provided at both ends by notching the annular portion; Second formed
The lock-up damper for a torque converter according to claim 2, further comprising a notch. 5. The torque converter according to claim 1, wherein the intermediate member penetrates in the axial direction of the torque converter and has a first opening formed with the first front locking portion and the first rear locking portion at both ends in the circumferential direction. An annular annular portion having an opening penetrating in the axial direction and having a second opening at both ends in the circumferential direction in which the second front locking portion and the second rear locking portion are formed; and the first and second elastic members. A supporting portion for supporting, wherein the input side locking portion is inserted into the first opening, and the output side locking portion is inserted into the second opening,
A lock-up damper for a torque converter according to claim 2. 6. A distance between the first front locking portion and the input locking portion and the second rear locking in a state where no torque is applied to the input side rotating body and the output side rotating body. A larger distance of the distance between the first elastic member and the second elastic member is smaller than an allowable deformation amount of one of the first elastic member and the second elastic member; 1 The smaller one of the distance between the front locking portion and the input side locking portion and the distance between the second rear locking portion and the output side locking portion is determined by the distance between the first elastic member and the first 2 is smaller than an allowable deformation amount of the other elastic member of the two elastic members, and a distance between the first rear locking portion and the input side locking portion, and a distance between the second front locking portion and the output side locking portion. The longer distance between the first elastic member and the second elastic member is equal to one of the elastic members of the first elastic member and the second elastic member. Smaller than the allowable deformation amount of the distance between the first rear locking portion and the input side locking portion and the distance between the second front locking portion and the output side locking portion. 6. The lock-up damper for a torque converter according to claim 2, wherein a distance between the first elastic member and the second elastic member is smaller than an allowable deformation amount of the other elastic member. 7. The first elastic member has a larger elastic coefficient than the second elastic member, and the locking portion of the intermediate member suppresses deformation of the second elastic member beyond an allowable deformation amount. 2. The lock-up damper for a torque converter according to claim 1, wherein said lock-up damper is locked to said input member or said output member.