Pre-twisted metal torsion bar and method of making same

Details Pre-twisted metal torsion bar and method of making same Pre-twisted metal torsion bar and method of making same

1994-10-18

1996-05-28

Graham, Matthew C.

Spring devices

Vehicle

Torsion

280700, 280721, 267154, F16F 114

Patent

active

055203760

ABSTRACT:
The invention relates to a metal torsion bar for vehicle suspension, including a straight central part which has a circular cross-section, the central part extending longitudinally between two fixing heads suitable for being rigidly fixed to other mechanical members, the torsion bar being work-hardened by pretwisting and at least the central part of the torsion bar having an annular cross-section. According to the invention, the cross-section of the central part has a radially outside plasticized zone, which has been deformed plastically by the pretwisting, and a radially inside elastic zone, which has been deformed elastically by the pretwisting, the cross-section of the central part of the torsion bar having a total area S and the plasticized zone having an area Sp such that their ratio Sp/S is at least equal to 0.5 and at most equal to 0.6.

REFERENCES:
patent: 2452974 (1948-11-01), Westin et al.
patent: 4231555 (1980-11-01), Saito
patent: 4322062 (1982-03-01), Aleck
patent: 5163701 (1992-11-01), Cromley, Jr.

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