192 clutches and power-stop control – Clutches – Operators
Patent
1990-10-16
1992-02-25
Braun, Leslie A.
192 clutches and power-stop control
Clutches
Operators
464 64, 464 68, F16D 314
Patent
active
050905430
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a damper disc having two torsion springs disposed in series within an opening for disposing torsion springs.
BACKGROUND OF THE INVENTION
In this type of damper disc, two torsion springs are disposed in series in an opening in order to assure wide twisting ranges, and an intervening support plate is inserted between torsion springs in a manner free to move in the circumferential direction.
The present applicant developed and applied a structure, in such damper disc of spring series type, of coupling support plates 51 to annular coupling plates 52 with pins 53 as shown in FIG. 4, in order to prevent the support plates from thrusting out in the radial direction by centrifugal force (unopened Japanese Utility Model Applications 63-38836, 63-84777).
However, the support plates 51 are disposed in a plane vertical to the clutch axial center, and an intermediate member (float element) 55 made of resin is pinched by a pair of support plates 51 spaced in the axial direction, and the springs 18 are received by their ends in the rotating direction.
That is, the spring 18 is received by the end which has a very small contacting area, and the surface pressure rises, which required improvements from the viewpoint of durability. Still worse, since the spring 18 does not receive the entire end surface in the rotating direction, the spring 18 may get loose during operation and tend to be unstable. Besides, since the pin 53 for oscillatably supporting the support plate 51 is positioned at a point enclosed by front and rear springs 18, and the support plate 51 is positioned at right angle to the clutch axial center, the limit of the setting length of the spring 18 in the rotating direction becomes large, and the degree of freedom for setting the torsional characteristic is limited.
OBJECT OF THE INVENTION
It is hence a primary object of the invention to extend the degree of freedom of setting the torsional characteristic, keep a wide oscillating range for support plates to smooth the oscillation, and enhance the durability of support plates, by allowing to set the spring length longer, in a damper disc of spring series arrangement type for keeping a wide torsional angle.
DISCLOSURE OF THE INVENTION
Technical Means
In order to achieve the above object, the invention presents a damper disc composed by forming plural openings respectively in the output side plate and input side plates, disposing at least two torsion springs in series in each opening, coupling the side plates and output side plate by the torsion springs so as to transmit torque, and placing an intervening support plate between two series torsion springs so as to be movable in the rotating direction, wherein the support plate is formed approximately in a V-shape opening outward in the radial direction so as to have a pair of spring receiving surfaces vertical to the surface perpendicular to the clutch axial center line by a folding member made of metal plate, a boss part is integrally formed at the front end part of the inner circumferential side of the support plate, the shape of the spring receiving surfaces is designed in a surface shape capable of abutting against the entire end surface of the torsion spring, and each boss part is oscillatably coupled to an annular coupling plate at the inner side in the radial direction by torsion spring by means of pin.
Operation of the Invention
At the time of rotation, the input side plate is twisted against the output side plate, and the two torsion springs disposed in series within a same opening are compressed. At the same time, the support plate between the torsion springs moves in the rotating direction, but since each support plate is integrally coupled by the coupling plate, it would not thrust out in the radial direction due to centrifugal force.
Each support plate is oscillatably coupled to the coupling plate by way of a pin, and even if the spring load is imbalanced, the support plate oscillates about the pin accordingly so absorb the imbalance.
In
REFERENCES:
patent: 2149887 (1939-03-01), Hickman
patent: 2220566 (1940-11-01), Wood
patent: 4188806 (1980-02-01), Fall et al.
patent: 4376477 (1983-03-01), Loizeau
patent: 4427400 (1984-01-01), Lamarche
patent: 4467905 (1984-08-01), Takeuchi
patent: 4530673 (1985-07-01), Lamarache
patent: 4601676 (1986-07-01), Tojima et al.
patent: 4743217 (1988-05-01), Tojima et al.
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Whitelak Nicholas
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