JPH10141473A - Damper mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure wide torsion angle characteristics in a damper mechanism in which an elastic member is arranged in an outermost peripheral part thereof. SOLUTION: A lock-up damper mechanism is a damper mechanism which attenuates the vibration transmitted from a front cover to a turbine while transmitting torque from the front cover to the turbine and is provider with a piston 17, a driven plate, a first torsion spring 21a, and a second torsion spring 21b. The piston 17 is connected with the front cover. The driven plate is connected with the turbine. The first and second torsion springs 21a, 21b are arranged in an outermost peripheral part and connect the piston with the driven plate elastically for the direction of rotation. The first and second torsion springs 21a, 21b are arranged in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper mechanism, and more particularly, to a damper mechanism that transmits torque from an input-side rotating body to an output-side rotating body and attenuates vibration during the torque transmission.

[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 lock-up clutch damper mechanism (hereinafter, referred to as a lock-up damper 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 damper 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 front cover to the output side member. is there.
Normally, this lock-up damper mechanism includes a piston that can be pressed against the front cover, a retaining plate fixed to the piston, a torsion spring supported on the retaining plate via a spring seat,
A driven plate elastically connected to the piston in a rotational direction by a torsion spring; The driven plate is fixed to a turbine connected to the output side rotating body. The spring seat is a member that supports both ends of the torsion spring, can contact a retaining plate or the like, and regulates the movement of the torsion spring in the rotation direction.

When the lock-up damper mechanism operates,
The torque is transmitted from the front cover to the piston and transmitted to the turbine via the torsion spring. Further, in the lock-up damper mechanism, while transmitting torque, the torsion spring slides on the retaining plate while repeating expansion and contraction between the driven plate and the retaining plate fixed to the piston to attenuate vibration.

On the other hand, the presence of such a lock-up damper mechanism increases the axial dimension of the torque converter. On the other hand, in order to shorten the axial dimension of the torque converter, a lock-up damper in which the torsion spring, which was conventionally arranged at the radially intermediate portion of the lock-up damper mechanism, is arranged at the outermost periphery where there is relatively room for space. A torque converter having a mechanism is provided.

[0007]

When the lock-up damper mechanism in which the torsion spring is disposed at the outermost periphery is employed, the axial dimension of the torque converter is reduced, but compared with the case where the torque converter is disposed at the intermediate portion in the radial direction. However, there is a problem that it is difficult to secure a twist angle. That is, when a torsion spring having the same compressible dimension is simply moved from the intermediate portion to the outer peripheral portion, the relative rotatable angle between the input-side rotator and the output-side rotator becomes smaller, and the torsion angle characteristic of the damper becomes smaller.

An object of the present invention is to secure a wide torsion angle characteristic in a damper mechanism in which an elastic member is disposed at an outermost peripheral portion.

[0009]

According to a first aspect of the present invention, there is provided a damper mechanism for damping 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. A damper mechanism including an input-side member, an output-side member, and an elastic member. The input side member is connected to the input side rotating body. The output side member is connected to the output side rotating body. The elastic member is arranged at the outermost periphery and elastically connects the input-side member and the output-side member in the rotation direction. There are at least two elastic members, which are arranged in series.

As described above, when the elastic member is arranged at the outermost periphery, the relative rotatable angle between the input member connected to the input rotary member and the output member connected to the output rotary member is ensured. It becomes difficult. Here, a wide torsion angle characteristic of the damper mechanism can be secured by arranging two or more elastic members in series to increase the compressible dimension of the entire elastic member.

According to a second aspect of the present invention, in the damper mechanism according to the first aspect, each elastic member is arranged in an arc shape. Here, the elastic members are arranged in an arc shape along the outer circumference in order to suppress a space problem caused by arranging the elastic members in series. In the damper mechanism according to the third aspect, in the damper mechanism according to the first or second aspect, the rigidity of each elastic member is at least two different rigidities.

Here, since elastic members having different stiffness are adopted for the elastic members arranged in series, the rigidity of each elastic member is combined, or the vibration region to be attenuated for each elastic member is allocated. Vibration over a wide area can be efficiently attenuated. A damper mechanism according to a fourth aspect is a lock-up damper mechanism in a torque converter. In the damper mechanism according to any one of the first to third aspects, the input-side member has an outer peripheral portion at least in a radial direction of an elastic member. It has a regulating member that regulates movement.

Here, the damper mechanism is a lock-up damper mechanism in the torque converter, and the merit (reduction in the axial dimension of the torque converter) of disposing the torsion spring at the outermost periphery is particularly large.
Further, since the centrifugal force acting on the torsion spring is increased by arranging the torsion spring at the outermost portion instead of the intermediate portion, the movement of the torsion spring in the radial direction is regulated by the regulating member.

A damper mechanism according to a fifth aspect is the damper mechanism according to any one of the first to fourth aspects, further comprising an intermediate sheet. The intermediate sheet is disposed between the adjacent elastic members and supports the adjacent elastic members.
Here, by arranging the intermediate sheet between the elastic members arranged in series, the portion where the two elastic members are connected has a simple structure, the manufacturing cost is reduced, and the damper mechanism in which the elastic members are arranged at the outermost peripheral portion is provided. Wide torsion angle characteristics can be secured.

According to a sixth aspect of the present invention, there is provided the damper mechanism according to the fifth aspect, wherein the intermediate sheet is provided with the first sheet.
It has a contact surface, a second contact surface, a first engagement portion, and a second engagement portion. The first contact surface contacts one elastic member,
The second contact surface contacts the other elastic member. The first engaging portion engages with one elastic member, and the second engaging portion engages with the other elastic member.

Here, the elastic reaction force of the elastic member is supported by the two contact surfaces. In addition, the damper mechanism according to claim 7, wherein the relative position between the intermediate sheet and the elastic member is suppressed by the two engagement portions, the first contact surface and the second contact surface of the damper mechanism according to claim 6. The surface is inclined such that one end is closer to the other and the other end is away from the other.

If the first abutment surface and the second abutment surface of the intermediate sheet are parallel to each other, the axes of the two elastic members are inclined when the elastic members are arranged along the circumference. It is conceivable that the end portion of the elastic member and the first or second contact surface are biased to adversely affect the life of the elastic member or the intermediate sheet. Here, since the first contact surface and the second contact surface are inclined in consideration of such inclination of both elastic members,
Uneven contact between these contact surfaces and the elastic member can be suppressed, and a reduction in the life of the elastic member or the intermediate sheet can be suppressed.

The damper mechanism according to claim 8 is the damper mechanism according to claim 6 or 7, wherein the elastic member is a coil spring. The first and second engaging portions have a columnar shape, and the first engaging portion has a diameter different from the diameter of the second engaging portion. When a coil spring is used as the elastic member of the damper mechanism, if a variety of elastic members having different stiffness are combined to obtain various damper characteristics, it is usually necessary to employ a plurality of coil springs having different wire diameters and inner diameters. Become.

Here, a plurality of coil springs are employed, and the diameter of the coil spring engaging with the first engaging portion of the intermediate sheet and the second coil spring are determined.
In correspondence with the case where the diameters of the coil springs engaged with the engaging portions are different, the first and second engaging portions are formed in a columnar shape, and the diameters thereof are set to dimensions corresponding to the respective coil springs to be engaged.

[0020]

FIG. 1 shows a torque converter 1 employing an embodiment of the present invention. here,
OO is a rotation axis of the torque converter 1, and an engine (not shown) is arranged on the left side of the figure, and a transmission (not shown) is arranged on the right side of the figure.

The torque converter 1 is a mechanism for transmitting torque from a crankshaft on the engine side to a main drive shaft 11 of the transmission, and includes a front cover 3 fixed to an input side member,
It comprises a torque converter main body composed of various types of impellers (impeller 4, turbine 5, stator 6) and a lock-up damper mechanism 2. The front cover 3 and the impeller shell 4a of the impeller 4 are welded at the outer periphery, and form a hydraulic oil chamber by both.

A plurality of nuts 13 are fixed to an outer peripheral surface of the front cover 3 on the engine side. A flexible plate (not shown) connected to the crankshaft on the engine side is mounted on the front cover 3 via the nut 13. Thus, the front cover 3
It is connected to the engine side crankshaft via a flexible plate.

The impeller 4 includes an impeller shell 4a, a plurality of impeller blades 4b fixed inside the impeller shell 4a, and an impeller hub 4c fixed to an inner peripheral end of the impeller shell 4a. The turbine 5 is arranged to face the impeller 4 in the hydraulic oil chamber, and mainly includes a turbine shell 5a and a plurality of turbine blades 5b fixed to the turbine shell 5a. The inner peripheral end of the turbine shell 5a is fixed to the flange 8a of the turbine hub 8 by a plurality of rivets 9. The inner periphery of the turbine hub 8 has a main drive shaft 1 extending from the transmission side.
It is connected to 1.

The stator 6 is disposed radially inward between the impeller 4 and the turbine 5, and is fixed via a one-way clutch 7 to a stator shaft 10 fixed to a transmission housing. next,
Lock-up damper mechanism 2 according to one embodiment of the present invention
Will be described.

The lock-up damper mechanism 2 is disposed between the front cover 3 and the turbine 5 in the axial direction. The lock-up damper mechanism 2 is shown in FIGS.
As shown in FIG. 5, mainly a piston (input side member) 17 and
It is composed of a driven plate (output side member) 20, a first torsion spring (elastic member) 21a, a second torsion spring (elastic member) 21b, and a retaining plate (restriction member) 19.

The piston 17 has a disk shape, and is formed with cylindrical portions 17a and 17b extending toward the transmission at the outer end and the inner end, respectively. The inner cylindrical portion 17b is supported on the outer peripheral wall of the turbine hub 8 so as to be slidable in the axial and circumferential directions. Piston 17
An annular facing member 22 is adhered to the outer peripheral portion of the front cover 3 on the surface facing the friction surface formed on the inner peripheral surface of the front cover 3.

The retaining plate 19 is provided for the piston 1
7 is disposed on the inner peripheral side of the cylindrical portion 17 a on the outer peripheral side, and the inner peripheral end is fixed to the piston 17 by a rivet 18. As shown in FIGS. 1 and 2, the retaining plate 19 is formed with an outer bent portion 19a, a cut-and-raised portion 19b, and a spring locking claw 19c. The outer curved portion 19a is provided with the retaining plate 19
Is bent toward the transmission side, and the tip portion is bent toward the inner side. The cut and raised portion 19b is located on the inner peripheral side of the outer bent portion 19a and formed by being cut and raised on the transmission side. The spring locking claws 19c are formed between the adjacent outer bent portions 19a.

First and second torsion springs 21
a and 21b elastically connect the piston 17 and the driven plate 20 in the rotational direction, and are supported by the outer peripheral bent portion 19a from the radial outside and by the cut-and-raised portion 19b from the radial inside. . The first and second torsion springs 21a, 21b are arranged at the outermost periphery of the lock-up damper mechanism 2, as shown in FIG. In the conventional lock-up damper mechanism, since the torsion spring is arranged at the intermediate portion instead of the outermost peripheral portion, the axial dimension of the torque converter is increased, and the torque converter is increased in size. Here, as shown in FIG. 1, the torque converter 1 is reduced in size by suppressing the axial dimension. 1st torsion spring 21
The spring rigidity of “a” is set higher than the spring rigidity of the second torsion spring 21b, and the wire diameters and inner diameters of the two torsion springs 21a and 21b are different. The first torsion spring 21a and the second torsion spring 21b are connected in series by an intermediate sheet 31 described later. Both torsion springs 21 connected
a, 21b, at both ends in the circumferential direction, as shown in FIG.
Spring seats 32a and 32b are mounted. The two torsion springs 21a and 21b are connected to the spring locking claws 19 via the spring seats 32a and 32b.
The movement in the circumferential direction is regulated by c.

The intermediate sheet 31 is made of resin.
As shown in FIG. 4, it is composed of a main body 31c, a first cylindrical portion (first engaging portion) 31a, and a second cylindrical portion (second engaging portion) 31b. The main body 31c has a first contact surface 31d with which the first torsion spring 21a contacts, and a second contact surface 31e with which the second torsion spring 21b contacts. As shown in FIG. 3, the first contact surface 31d and the second contact surface 31e are inclined such that one end is closer to the other and the other end is apart from each other. First and second cylindrical portions 31
a and 31b extend perpendicularly to the first and second contact surfaces 31d and 31e from the first contact surfaces 31d and 31e, and are inserted into the first and second torsion springs 21a and 21b. Further, since the inner diameters of the torsion springs to be inserted are different from each other, the first and second cylindrical portions 31a, 31
The diameter of b is different. Although the intermediate sheet 31 is manufactured using a resin as a raw material here, the intermediate sheet 31 is manufactured from an appropriate raw material such as a resin, a metal, a sintered metal, a ceramic, or a combination thereof according to required damper characteristics and the like.

The driven plate 20 is a ring-shaped member, and is fixed to a surface of the turbine shell 5a on the engine side as shown in FIG. A plurality of bent claws 20a are formed on the driven plate 20, and these come into contact with spring seats 32a, 32b mounted on the ends of the torsion springs 21a, 21b. Next, the operation will be described.

The torque from the engine side crankshaft is input to the front cover 3 via a flexible plate (not shown). This torque is transmitted to the impeller shell 4a. As a result, the impeller 4 rotates,
Hydraulic oil flows from the impeller 4 to the turbine 5. The flow of the hydraulic oil causes the turbine 5 to rotate, and the torque of the turbine 5 is output to the main drive shaft 11 via the turbine hub 8.

When the speed ratio of the torque converter 1 increases and the main drive shaft 11 reaches a constant rotation speed,
The hydraulic oil in the gap between the piston 17 and the front cover 3 is drained through the inside of the main drive shaft 11. As a result, the piston 17 is pressed against the front cover 3 by the hydraulic pressure difference, and the facing member 22 is pressed against the friction surface of the front cover 3. Thereby, the torque of the front cover 3 is transmitted from the piston 17 to the turbine 5 via the lock-up damper mechanism 2.
That is, the front cover 3 is mechanically connected to the turbine 5, and the torque of the front cover 3 is output to the main drive shaft 11 via the turbine 5.

At this time, the lock-up damper mechanism 2
Transmits torque and attenuates vibration transmitted from the front cover 3 to the main drive shaft 11. Lock-up damper mechanism 2 from front cover 3
, The first and second torsion springs 21 a and 21 b repeatedly expand and contract between the retaining plate 19 fixed to the piston 17 and the driven plate 20. At this time, the first and second torsion springs 21a and 21b and the retaining plate 19
Slides, a sliding resistance (hysteresis torque) is generated between the two. Thereby, the input vibration is attenuated.

Here, the first torsion spring 21
a and the second torsion spring 21 b are arranged in series, so that the relative rotation angle between the retaining plate 19 and the driven plate 20 fixed to the piston 17 is large, and the first and second torsion springs 21 b
Even if a and 21b are arranged at the outermost peripheral portion of the lock-up damper mechanism 2, vibration with a wide torsion angle can be attenuated. Further, since the rigidity (spring constant) of the first torsion spring 21a and the rigidity of the second torsion spring 21b are different and have two-stage spring characteristics, the vibration can be efficiently attenuated according to the amplitude and frequency of the vibration. Can be.

[0035]

According to the present invention, in a damper mechanism in which an elastic member is arranged at the outermost periphery, two or more elastic members are arranged in series to increase the compressible dimension of the entire elastic member. Wide torsion angle characteristics of the damper mechanism can be secured.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a torque converter employing a lock-up damper mechanism according to an embodiment of the present invention.

FIG. 2 is an assembly plan view of a lock-up damper mechanism.

FIG. 3 is a plan view of an intermediate sheet.

FIG. 4 is a bottom view of the intermediate sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque converter 2 Lock-up damper mechanism 3 Front cover 5 Turbine 11 Main drive shaft 17 Piston 19 Retaining plate 20 Driven plate 21a First torsion spring 21b Second torsion spring 31 Intermediate seat 31a First cylindrical portion 31b Second cylindrical portion 31d First contact surface 31e Second contact surface

Claims (8)

[Claims] 1. A damper mechanism for transmitting a torque from an input-side rotating body to an output-side rotating body and attenuating vibration transmitted from the input-side rotating body to the output-side rotating body. An input-side member to be connected, an output-side member to be connected to the output-side rotating body, and an outermost peripheral portion, which elastically connects the input-side member and the output-side member in a rotational direction. And at least two elastic members arranged in series. 2. The damper mechanism according to claim 1, wherein each of said elastic members is arranged in an arc shape. 3. The damper mechanism according to claim 1, wherein the rigidity of each elastic member is at least two different rigidities. 4. The damper mechanism is a lock-up damper mechanism in a torque converter, and the input side member has a regulating member on an outer peripheral portion that regulates at least a radial movement of the elastic member. The damper mechanism according to claim 1. 5. The damper mechanism according to claim 1, further comprising an intermediate sheet disposed between the adjacent elastic members and supporting the adjacent elastic members. 6. The intermediate sheet has a first contact surface that contacts one elastic member, a second contact surface that contacts the other elastic member, and a first engagement member that engages with the one elastic member. The damper mechanism according to claim 5, further comprising a joint portion and a second engagement portion that engages with the other elastic member. 7. The damper mechanism according to claim 6, wherein the first contact surface and the second contact surface are inclined such that one end is closer to the other and the other end is separated from the other. 8. The elastic member is a coil spring, the first and second engaging portions are cylindrical, and the first engaging portion has a diameter different from the diameter of the second engaging portion. Item 6. The damper mechanism according to item 6 or 7.