Volute springs adapted for torsional damper assemblies and metho

Details Volute springs adapted for torsional damper assemblies and metho Volute springs adapted for torsional damper assemblies and metho

1994-01-26

1996-09-24

Stodola, Daniel P.

Spring devices

Torsion

Coil

464 66, 464 68, F16F 110

Patent

active

055583172

ABSTRACT:
A volute spring that is particularly adapted to be incorporated in a damper assembly to absorb or neutralize the transient torsional spikes normally occurring at the crankshaft of a vehicle. A volute spring having the improved frictional hysteresis characteristic provided by the present invention utilizes the conventional plurality of telescopically adjacent coils, and each coil has oppositely directed surfaces which present opposed surfaces on the telescopically adjacent coils. At least one of the opposed engaging surfaces has a configuration that obviates the formation of a hydrodynamic oil film. One configuration that obviates the formation of a hydrodynamic oil film comprises a plurality of intersecting grooves recessed into at least one surface of the metallic strip from which the volute spring is wound. The intersecting grooves define a plurality of polygonal lands which cumulatively provide at least one of the engaging surfaces on the adjacent coils of the volute spring. Another configuration that obviates the formation of a hydrodynamic oil film utilizes a porous surface such as may be provided by conventional paper and resin clutch wear materials. The clutch wear material is bonded to at least one of the opposed surfaces of the metallic strip from which the volute spring is wound.

REFERENCES:
patent: 3373855 (1968-03-01), Ericson
patent: 4789374 (1988-12-01), Suzuki
patent: 5090945 (1992-02-01), Graton et al.
patent: 5203835 (1993-04-01), Kohno et al.
patent: 5209334 (1993-05-01), Fischer et al.
patent: 5401213 (1995-03-01), Muchmore et al.

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