Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Utility Patent
1998-04-20
2001-01-02
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
C464S066100
Utility Patent
active
06168526
ABSTRACT:
BACK OF THE INVENTION
A. Field of the Invention
The present invention relates to a damper disk assembly, and in particular to a damper disk assembly for use in a clutch disk assembly or the like where a retaining plate is formed with means for coupling to other members of the damper disk assembly.
B. Description of the Background Art
A clutch disk assembly used in a clutch for an automotive vehicle typically includes a pair of input plates opposed to each other, an output hub formed with a radial flange, and coil springs disposed between the flange and the input plates for elastically coupling the paired input plates to the flange but allowing limited relative rotary displacement therebetween. The paired input plates are fixed together at their radially outer portions by a plurality of stop pins for integral rotation. The stop pins extend through recesses formed near the outer periphery of the flange, respectively. The input plates are rotatable relative to the flange through a predetermined angle. When the stop pins are brought into contact with edges of the recesses, the input plates stop its rotation relative to the flange.
The conventional clutch disk assembly described above uses the stop pins as members for restricting relative rotation between the input plates and the flange. Each stop pin requires a minimum diameter, and for structural strength must be located radially inside the outer periphery of the input plates. Due to the limiting conditions associated with the arrangement of the stop pins, the torsion angle within which relative rotation between the paired input plates and the flange occurs cannot be easily increased. This means that, even if hard coil springs are used, the capacity or properties of the coil springs cannot be fully utilized, because the relative torsion angle cannot be increased sufficiently.
For reducing noises during driving such as gear noises from a driving system and resonant noises, it is necessary to minimize the torsional rigidity in the acceleration and deceleration range and thereby set the resonant frequency range of the driving system below the practical or service rotation range of the engine. For achieving such a low rigidity and a high stopper torque, it is necessary to increase the maximum allowable torsion angle.
SUMMARY OF THE INVENTION
An object of the invention is to provide a damper disk assembly with a construction which overcomes the disadvantages associated with the necessary configuration of stop pins in the prior art, and to provide the damper disk assembly with a sufficient increase in a relative torsion angle between an input member and an output member, as compared with the prior art.
In accordance with one aspect of the present invention, a damper disc assembly includes first rotary plate formed with a plurality of extending portions. Each of the extending portions is formed with a window. A second rotary plate is arranged coaxially at a first axial side of the first rotary plate, and has a plurality of first supports corresponding to the plurality of windows, respectively. A third rotary plate is arranged coaxially at a second axial side of the first rotary plate, and has a plurality of second supports corresponding to the plurality of windows, respectively. A plurality of plate-like coupling portions couple outer peripheral portions of the second and third rotary plates together, and each has a radial length shorter than a circumferential length thereof. A radially outer portion of each of the plate-like coupling portions defines a stopper. A plurality of springs are arranged within the windows and the first and second supports, elastically coupling the first rotary plate to the second and third rotary plates in the circumferential direction, and are compressed between the windows and the first and second supports when the first rotary plate rotates relative to the second and third rotary plates. Further, each of the plate-like coupling portions are arranged circumferentially between the projections, and are able to contact circumferentially with one of the stoppers in response to relative rotation between the first rotary plate and the second and third rotary plates. The stoppers and the projections are configured such that the first rotary plate and the second and third rotary plates may undergo relative rotation with respect to one another within an angular displacement range of at least
300
.
In the damper disc assembly in accordance with the present invention, the circumferential angle of the projection is smaller than the circumferential angle of the window. Therefore, the circumferential space between the projections is sufficiently large and relative rotary displacement between plates can be maximized.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description, when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5052978 (1991-10-01), Hanke
patent: 5540620 (1996-07-01), Haneda et al.
patent: 5697846 (1997-12-01), Uenohara
patent: 5725080 (1998-03-01), Lohaus
patent: 5730656 (1998-03-01), Yamamoto
patent: 5954585 (1999-09-01), Nagano et al.
patent: 6083107 (2000-07-01), Herbst
Mizukami Hiroshi
Uenohara Norihisa
Binda Greg
Browne Lynne H.
Exedy Corporation
Shinjyu Global IP Counselors, LLP
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