JPH0728448Y2 - Lockup damper device for fluid coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a piston plate movably in an axial direction between an output side turbine and an input side front cover, and a friction facing provided on the piston plate. The present invention relates to a lock-up damper device for a fluid coupling in which a front cover is frictionally engageable and a torsion spring that transmits power from a piston plate to the turbine at the time of lock-up is arranged radially inward of the turbine.

(Prior Art) As shown in FIG. 3, the fluid coupling is located so that the turbine and the pump are closer to the outer side in the radial direction than the torque converter. Therefore, the lock-up damper device D is the inner side in the radial direction of the turbine. It is located in the space of.

However, in the conventional lock-up damper device D, a pair of side plates 30 are coupled to the piston plate 12,
The flange 31 of the output hub 29 is located between them, and the torsion spring 20 is arranged in the window hole of the flange 31 and the window hole of the side plate 30.

According to this structure, since the hub 29 itself also needs to move in the axial direction, the hub 29 has a spline portion 29a on its inner circumference.
The output shaft 10 is spline-fitted. The hub is also forged. Therefore, the machining is time-consuming and expensive, and the damper device becomes heavy.

(Object of the Invention) An object of the present invention is to provide a lock-up damper device which is configured by using various plates, has a simple structure, and can be reduced in weight and cost.

(Technical means for achieving the object) In order to achieve the above object, according to the present invention, a piston plate is disposed between an output side turbine and an input side front cover so as to be movable in an axial direction, and the piston plate is provided on the piston plate. In the lock-up damper device of the fluid coupling, the friction facing is frictionally engageable with the front cover, and the torsion spring that transmits the power from the piston plate to the turbine at the time of lock-up is arranged radially inward of the turbine. The retaining plate that holds the inner and side sides of the and the side plate that holds the outer side are arranged on the inner side of the turbine, and their outer peripheral ends are extended outward to form a piston plate with a common rivet. The driven plate is directly connected to the turbine by tightening together. A driving projection and a driven projection, which engage with the circumferential edge of the torsion spring, are formed on the ring plate and the driven plate, respectively, and the torsion spring is compressed between them.

(Operation) When the lockup is not performed, the facing of the piston plate is separated from the front cover, so that the power from the input side front cover is transmitted from the pump to the output side turbine via the fluid.

During lockup, the piston plate moves in the axial direction by the force of the fluid, and the facing comes into pressure contact with the front cover. As a result, power is transmitted from the front cover to the turbine through the facing, piston plate, retaining plate, torsion spring and driven plate.

(Embodiment) In FIG. 1 showing a vertical cross-sectional view (corresponding to II cross-section of FIG. 2) of a fluid coupling to which the present invention is applied, a pump 1 and a turbine 2 having a large number of blades are axially opposed to each other The pump 1 is fixed to a pump cover 6, the pump cover 6 covers the axial rear side of the fluid coupling, the radially inner end is welded to the cylinder shaft 5, and the outer end is the front cover 3. It is welded. The front cover 3 covers the front side of the fluid coupling and is connected to an unillustrated flywheel of the engine or the like. The space surrounded by the front cover 3 and the pump cover 6 is filled with power transmission fluid.
Reference numeral 14 is a sealing cap 14 welded to the shaft core of the front cover 3. The turbine 2 is fixed to a turbine cover 8. The turbine cover 8 has an inner end portion integrally connected to an inner peripheral end portion of a driven plate 18 by a rivet 19 and also fixed to an output shaft 10.

The lockup damper device D includes a piston plate 12,
It comprises a retaining plate 15, a side plate 16, a torsion spring 20 and the driven plate 18. The piston plate 12 is arranged between the turbine cover 8 and the front cover 3 and has a cross-sectional shape corresponding to the shape of the front cover 3. The piston plate 12 faces the front cover 3 on the outer front surface. A friction facing 13 that can be frictionally engaged with is fixedly attached, and a bent boss portion is provided on the inner end.
12a is formed and fitted to the outer peripheral surface of the output shaft 10 so as to be movable in the axial direction.

The torsion spring 20 is arranged inward of the turbine 2 and between the piston plate 12 and the turbine cover 8 so as to be circumferentially compressible.

The retaining plate 15 and the side plate 16 have a piston plate 12 with a common rivet 14 at their outer ends.
Is attached to the rear face of. The retaining plate 15 extends downward from the rivet 14 portion to hold the front side of the torsion spring 20 and to the rear end of the inner peripheral projection 15a at the inner end.
The inner circumferential side of the torsion spring 20 is held by the inner circumferential projection 15a. The side plate 16 is bent rearward and holds the outer peripheral side of the torsion spring 20. Further, the retaining plate 15 is formed with a lateral drive protrusion 15c protruding rearward from the middle of the radial direction and a vertical drive protrusion 15b protruding upward from the inner peripheral protrusion 15a. On the other hand, a driven projection 18a which is bent forward is integrally formed at the outer end of the driven plate 18.

In FIG. 2, which is a view of the lock-up damper viewed from the arrow II in FIG. 1, drive protrusions 15b, 15c of the retaining plate 15 are shown.
The driven projections 18a of the driven plate 18 and the driven projections 18a are arranged in the same phase and engage with the circumferential end edges of the torsion springs 20, respectively, and drive projections 15b, 1 when the torsion torque is generated.
The torsion spring is adapted to be compressed between 5c and the driven projection 18a.

The operation will be described. At the time of non-lockup, the facing 13 of the piston plate 12 is separated from the front cover 3, so that the power from the front cover 3 is transmitted to the turbine 2 via the pump cover 6, the input side pump 1 and the fluid, and the output shaft 10 Be transmitted to.

At the time of lockup, the piston plate 12 is pushed forward due to an increase in fluid pressure in the fluid coupling, and the facing 13 is brought into pressure contact with the front cover 3 to be directly connected. Thereby, the power from the front cover 3 is transmitted from the turbine 2 to the output shaft 10 via the facing 13, the piston plate 12, the retaining plate 15, the side plate 16, the torsion spring 20 and the driven plate 18. When torsional vibrations etc. occur, the driving projections 15b and 15c and the driven projection 18
The torsion spring is compressed between a and absorbs the vibration.

(Effect of the Invention) As described above, according to the present invention, in the lockup damper device arranged between the turbine 2 and the front cover 3, and the torsion spring 20 thereof is arranged on the inner side of the turbine 2, 1) A retaining plate 15 that holds the front side and the inner peripheral side of the torsion spring 20 and transmits power to the torsion spring 20.
The side plate 16 for holding the outer peripheral side and the driven plate 18 on the output side for transmitting the power from the torsion spring 20 to the turbine, and the driven plate 18 is fixed to the turbine. In addition, the spline portion due to the output hub structure can be eliminated, processing becomes easy, and weight reduction and cost reduction can be achieved.

(2) The lock-up damper device is composed of a plate made of sheet metal, and the torsion spring 20 and various plates 1
By arranging 5 and 16 on the inner side of the turbine 2, compactness and weight reduction can be achieved.

Further, since the outer peripheral end portions of the retaining plate 15 and the side plate 16 are extended outward and are jointed by being tightened together with the piston plate 12 by the common rivet 14, the side plate 16 and the retaining plate 15 are connected. Assembling work becomes simple, and positioning between both plates 15 and 16 can be performed easily and accurately at the time of assembling.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a fluid coupling to which the present invention is applied (corresponding to II sectional view of FIG. 2), FIG. 2 is a view of the lock-up damper device of FIG. FIG. 1 ... Pump, 2 ... Turbine, 3 ... Front cover, 5 ... Input shaft, 10 ... Output shaft, 12 ... Piston plate, 13 ... Facing, 15 ... Retaining plate, 16 ... Side Plate, 18 …… driven plate,
20 ... torsion spring

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A piston plate is disposed between an output side turbine and an input side front cover so as to be movable in an axial direction, and a friction facing provided on the piston plate is frictionally engageable with the front cover. In a lockup damper device for a fluid coupling in which a torsion spring that transmits power from the piston plate to the turbine at the time of lockup is arranged on the inner side, a retaining plate and an outer peripheral side that hold the inner and side surfaces of the torsion spring are provided. The side plates to be held are arranged on the inner side of the turbine, the outer peripheral ends thereof are extended outwardly, and the piston plates are jointly fastened to each other by a common rivet so as to be coupled, and the driven plate is directly coupled to the turbine. The above-mentioned retaining plate and driven plate have torsion The circumferential end to form a drive projection and the drive projection for engaging the edge, the lock-up damper device of the fluid coupling which is adapted to compress the torsion spring therebetween.