JPH0624605Y2 - Lockup damper device for torque converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is, in a torque converter, generated in an engine while a lockup clutch for putting a torque converter into a non-operating (lockup) state is operating. The present invention relates to a lockup damper device provided between a piston having a friction facing (clutch plate) of a lockup clutch and a turbine of a torque converter in order to prevent the torsional vibration from being transmitted to a subsequent transmission.

(Prior Art and Problems Thereof) No. 4 showing Japanese Utility Model Laid-Open No. 63-75655 by the present applicant
In the figure, the torque converter 10 comprises a pump 11, a turbine 12, a stator 13, etc., and the pump 11 and the front cover 14 are welded. The front cover 14 is connected to the crankshaft 15 (input shaft) at the center. The turbine 12 is spline-fitted to an output shaft 17 that is connected to a subsequent transmission via a hub 16.

A lockup damper 18 is provided between the turbine 12 and the front cover 14, and the power of the front cover 14 is directly connected to the hub 16 by the lockup damper 18. The lock-up damper 18 has a friction facing 19a, and has an axially slidable piston 19, a retaining plate 22 fixed to the piston 19, and a driven plate 2 fixed to the hub 16.
1, driven plate 21, retaining plate 22
It is composed of a torsion spring 20 and the like provided between them.

However, if the torsion spring 20 is provided on the outer peripheral portion or the torsion spring 23 is provided on the inner peripheral portion as shown in FIG. 5 (symmetrical to FIG. 4), the twist angle of the lock-up damper 18 is increased. And the characteristic of transmission torque is limited in that it is limited to a narrow range. Furthermore, since the holding portion 22a of the retaining plate 22 has a cut-and-raised shape, a cutting line is generated in the outer peripheral portion of the retaining plate 22, and there is room for improvement in the burst strength at this portion.

In addition, in the case of FIG. 5 and as shown in FIG. 6, when the torsion spring 26 and the torsion spring 27 are provided on both the outer peripheral portion and the inner peripheral portion, two driven plates (in FIG. Plate 24a and retaining plate 24b, side plates 28a, 2 in FIG.
8b) and one driven plate 25 (reference numeral 25 in FIG. 5, reference numeral 29 in FIG. 6) are in the axial direction (left and right in the figure).
However, the structure is complicated and the cost is increased.

(Object of the Invention) The present invention has the torsion springs on both the outer peripheral portion and the inner peripheral portion to expand the range of the torsion angle-transmission torque characteristics, and at the portion for holding the torsion spring in the outer peripheral portion. An object of the present invention is to provide a lock-up damper device for a torque converter that can improve burst strength, can hold both torsion springs with a simple structure, and can reduce cost.

(Structure of the Invention) (1) Technical Means In the present invention, a piston 19 having a friction facing 19a frictionally engaged with the front cover 14 is provided between the turbine 12 of the torque converter 10 and the front cover 14.
Is provided slidably in the axial direction, and the piston 19 having the friction facing 19a and the turbine 12 are rotatably connected to each other via a plurality of circumferentially long torsion springs 20 and 50.
In the case where 50 is provided on both the outer peripheral portion and the inner peripheral portion, the friction facing 19 faces the front cover 14.
The annular retaining plate 32 and the annular side plate 33 are sequentially fixed to the turbine 12 side surface of the piston 19 to which the a is fixed from the piston 19 side by the rivet 34 at the center of each radial width, and the torsion spring 20 on the outer periphery is fixed. A holding portion 41 that holds the torsion spring 20 on the outer circumference and a holding portion 41 that holds the torsion spring 20 on the outer circumference while the tip end 41a on the turbine 12 side is reduced in diameter toward the turbine 12 side from the outside. 47 is formed on the retaining plate 32, and a holding portion 42 that holds the outer circumferential torsion spring 20 from inside and a holding portion 48 that holds the inner circumferential torsion spring 50 from outside.
Formed on the side plate 33, the protrusions 38 and 39 engaging with the end face of the outer peripheral torsion spring 20 and the protrusion 4 engaging with the end face of the inner peripheral torsion spring 50.
5, 44 are formed on the retaining plate 32 and the side plate 33, respectively, and the holding portion 41 on the outer periphery of the retaining plate 32 is fitted to the inner surface of the tubular portion 55 protruding from the outer peripheral edge of the piston 19 to the turbine 12 side. The driven plate 35 fixed to the turbine 12 and arranged along the front cover 14 side end surface of the turbine 12 is provided with protrusions 40 and 46 that engage with the end surfaces of the outer circumferential torsion spring 20 and the inner circumferential torsion spring 50, respectively. A coil spring 50a outside the torsion spring 50 on the inner circumference,
A coil spring 50 of a small diameter shorter than that in 50b
The lock-up damper device for a torque converter is characterized in that c is arranged.

(2) Action The holding portion of the retaining plate that holds the torsion spring in the outer peripheral portion from the outside has a continuous tubular shape, and the burst strength is higher than when there is a cutting line.

Since both torsion springs are held by both the retaining plate and the side plate, the structure of the outer peripheral portion of the retaining plate is simplified.

(Example) First showing a lock-up damper 18 adopting the present invention
In the figure, the parts denoted by the same reference numerals as in FIG. 4 indicate the same or corresponding parts.

In FIG. 1, a protrusion 30 for accommodating the torsion spring 20 is formed on the outer peripheral portion of the piston 19, and a protrusion 31 for accommodating the torsion spring 50 is formed on the inner peripheral portion. On the left end surface of the piston 19 in the figure, a retaining plate 32 and a side plate 33 are provided with rivets 34.
It is fastened together. This retaining plate 32,
The side plate 33 (both are drive plates) holds the torsion spring 20 and the torsion spring 50, and transmits the power input to the piston 19 to the torsion springs 20 and 50. A driven plate 35 that transmits power to the hub 16 via the spring force of the torsion springs 20 and 50 is provided along the turbine 12, and the driven plate 3 is provided.
5 is fixed to the hub 16 with rivets 36.

As shown in FIG. 2, the outer periphery of the torsion spring 20 is formed by concentrically combining three coil springs 20a to 20c, and spring seats 37 are in pressure contact with both ends of the torsion spring 20, respectively. The spring seat 37 has protrusions 3 formed by cutting and raising the retaining plate 32 and the side plate 33.
8 and 39 are pressed. The protrusion 38 extends substantially horizontally from the right to the left in FIG. 1, and the protrusion 39 extends from the upper end portion of the side plate 33 in a substantially inverted L shape (FIG. 1). A protrusion 40 that cuts and raises the driven plate 35 is provided between the protrusion 38 and the protrusion 39, and the protrusion 40 is also in pressure contact with the spring seat 37.

In addition, the retaining plate 41, which has a cylindrical shape and is continuous from the outside in the radial direction to hold the torsion spring 20, is formed on the retaining plate 3.
2 is formed, and the tip portion 41a of the holding portion 41 is curved so as to surround the torsion spring 20.
The protrusion 38 is a holding portion 41 of the retaining plate 32.
It is formed by cutting and raising the inner portion in the radial direction, and the holding portion 41 has a tubular shape that is continuous over the entire circumference.

On the other hand, the inner side in the radial direction of the torsion spring 20 is held by a holding portion 42 formed by cutting and raising from the upper end of the side plate 33 into a substantially inverted L shape.

As described above, the torsion spring 20 is provided between the retaining plate 32, the side plate 33, and the driven plate 35 so as to exert a spring force in the circumferential direction, and the torsion spring 20 is provided at six positions in the circumferential direction. Are evenly spaced.

Next, as shown in FIG. 2, the torsion spring 50 on the inner peripheral portion is formed by combining three coil springs 50a to 50c in a concentric manner and arranging them at five locations in the circumferential direction at equal intervals. is there. The coil springs 50a and 50b are long and operate from the first step with a small twist angle, and the coil spring 50c acts with the second step with a large angle.

The spring seats 34 are pressed against both ends of the torsion spring 50, and the spring seats 43 are attached to the projections 44 of the side plate 33 and the retaining plate 3.
The second protrusion 45 and the protrusion 46 of the driven plate 35 are in pressure contact with each other. The protrusions 44, 45, 46 are formed by cutting and raising similarly to the structure of the torsion spring 20 portion described above.

Torsion spring 5 on retaining plate 32
A holding portion 47 having a curved shape is formed so as to surround 0 from the inside in the radial direction, and an eave-shaped holding portion 48 that presses the torsion spring 50 from the outside in the radial direction is cut and raised on the side plate 33. It is formed by processing.

Next, the operation will be described. In the above embodiment, the power introduced from the friction facing 19a is applied to the torsion spring 20 at the piston 19, the protrusion 38 of the retaining plate 32, the protrusion 39 of the side plate 33, and the torsion spring 2 in order from the friction facing 19a.
0, the protrusion 40, the driven plate 35, and the friction facing 1 at the torsion spring 50.
Piston 19 and retaining plate 3 in order from 9a
2 protrusion 45 and side plate 33 protrusion 44, torsion spring 50, protrusion 46, driven plate 3
It is transmitted to 5.

In the small torsion angle range, the coil springs 20a to 20c of the torsion spring 20 and the torsion spring 5
A total of five types of springs including the coil springs 50a and 50b of 0 generate spring force, and eventually the torsion angle increases, and in the large torsion angle range, all springs including the coil spring 50c exert the spring force.

Therefore, as compared with the case where only one of the torsion springs 20 and 50 is provided, the range of the characteristics of the torsion angle-transmission torque obtained by the lockup damper 18 is wider.

When the lock-up damper 18 rotates at high speed, centrifugal force acts on the torsion springs 20 and 50, but the torsion spring 20 on the outer circumference is held from the outside by a continuous cylindrical holding portion 41. The burst strength of 41 is high.

(Effects of the Invention) As described above, in the lockup damper device for a torque converter according to the present invention, the power input to the piston 19 is buffered by both the outer peripheral torsion spring 20 and the inner peripheral torsion spring 50. Compared with the case where only one of the torsion spring 20 and the torsion spring 23 is provided, the torsion angle-transmission torque characteristics obtained by the lockup damper 18 are compared with each other as shown in FIG. 2a. The characteristics spread from the conventional region X1 to the region X2, and the twist angle changes from θ1 to θ2, which can be set over a wide range according to the vehicle requirements.

Since the holding portion 41 of the retaining plate 32 that holds the torsion spring 20 from the outside has a cylindrical shape that is continuous over the entire circumference, even if the centrifugal force acting on the torsion spring 20 acts on the holding portion 41, the holding portion 41. Is high, and the burst strength can be improved as compared with the case where there is a cutting line as in the past.

The holding portion 41 is surrounded from the outside by the outer peripheral edge portion of the piston 19, but since the centrifugal force of the torsion spring 20 directly acts, improving the strength of the holding portion 41 is effective for improving the burst strength. is there.

Since the holding portion 42 that holds the torsion spring 20 on the outer peripheral portion from the inside is formed on the side plate 33, the structure of the retaining plate 32 is simplified, the number of processing steps for the retaining plate 32 is reduced, and the cost is reduced.

Since the holding portions 41, 47 and the holding portions 42, 48 are divided into both the retaining plate 32 and the side plate 33, even when both the torsion spring 20 and the torsion spring 50 are provided, the structure is different from that in FIG. It becomes easy and the cost can be reduced.

Further, according to the present invention, the rivet 34 fastens the center of each radial width of the retaining plate 32 and the side plate 33 to the piston 19, so that the retaining plate 32 and the side of the retaining plate 32 and the side radially inward of the rivet 34 are fixed. The force from the holding portion and the projection provided on the plate 33 can be effectively held by the rivet 34 with a small amount, and the whole is compacted without taking up a space. Attach the retaining plate 32 and the side plate 33 to the piston 1
Since the piston 19 is sequentially arranged and fixed to the piston 9, the role of the retaining plate 32 and the side plate 33 is rational. That is, the retaining plate 41 is provided with the holding portions 41 and 47 and the projections 38 and 45 at positions away from the rivet 34, and the side plate 33 is provided with the rivet 3
The holding portions 42 and 48 and the projections 39 and 44 can be provided at positions close to 4, and the holding portions and the projections can be arranged while avoiding interference. Since the tapered tip portion 41 a is provided on the holding portion 41, the protrusion 4 is formed on the end surface of the torsion spring 20.
Even if a force from 0 is applied in the axial direction, the torsion spring 20 will not be displaced in the axial direction. Further, since the holding portion 41 is fitted on the inner surface of the tubular portion 55, the holding portion 41 can withstand even a large centrifugal force from the torsion spring 20 and the durability is improved. Since the coil springs 50a and 50b are each provided with a coil spring 50c having a smaller diameter, which is shorter than that, without changing the appearance
A two-step characteristic can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing a lock-up damper device of the present invention, FIG. 2 is a partial plan view of FIG. 1, FIG. 2a is a graph showing characteristics of torsion angle-torque, and FIG. FIG. 4 is a plan view showing an embodiment of FIG.
FIG. 6 and FIG. 6 are vertical cross-sectional views of main parts showing another conventional example. 1
0 ... Torque converter, 12 ... Turbine, 14 ... Front cover, 18 ... Lockup damper, 19 ... Piston, 19a ... Friction facing, 20, 50 ... Torsion spring, 32 ... Retaining plate, 33 ... Side plate, 35 ... Driven Plate, 41, 42,
47, 48 ... Holding unit

Claims (1)

[Scope of utility model registration request] 1. A piston 1 having a friction facing 19a frictionally engaged with the front cover 14 between a turbine 12 and a front cover 14 of a torque converter 10.
9 is provided slidably in the axial direction, and friction facing 19a
19 and the turbine 12 are rotatably connected to each other via a plurality of torsion springs 20 and 50 that are long in the circumferential direction.
In the case where 0 and 50 are provided on both the outer peripheral portion and the inner peripheral portion, the surface of the piston 12 facing the front cover 14 and having the friction facing 19a fixed thereto on the turbine 12 side is provided with an annular retaining surface in order from the piston 19 side. The plate 32 and the annular side plate 33 are fixed by the rivets 34 at the center of each width in the radial direction, the torsion spring 20 on the outer periphery is held from the outside, and the tip portion 4 on the turbine 12 side is fixed.
The holding portion 41 that holds the torsion spring 20 on the outer circumference and the holding portion 4 that holds the torsion spring 50 on the inner circumference are reduced in diameter as 1a moves toward the turbine 12 side.
7 is formed on the retaining plate 32, and a holding portion 42 for holding the outer circumferential torsion spring 20 from the inside and a holding portion 48 for holding the inner circumferential torsion spring 50 from the outside are formed on the side plate 33. Projections 38, 39 engaging with the end surface of the torsion spring 20 of
And projections 45 and 44 that engage with the end surface of the inner torsion spring 50 are formed on the retaining plate 32 and the side plate 33, respectively, and a holding portion 41 on the outer periphery of the retaining plate 32 is provided from the outer peripheral edge of the piston 19 to the turbine 12 The driven plate 35 fitted to the inner surface of the tubular portion 55 protruding toward the side and fixed to the turbine 12 and arranged along the end surface of the turbine 12 on the front cover 14 side has a torsion spring 20 on the outer circumference and a torsion spring 50 on the inner circumference. Provided with projections 40 and 46 that engage with the respective end surfaces of the coil spring 5 on the outer side of the torsion spring 50 on the inner circumference.
A lock-up damper device for a torque converter, characterized in that a coil spring 50c having a smaller diameter than that of 0a and 50b is arranged.