Coil spring resistant to permanent set and fatigue

Details Coil spring resistant to permanent set and fatigue Coil spring resistant to permanent set and fatigue

1998-02-02

2000-02-15

Schwartz, Chris

Spring devices

Coil

Conical

267180, 148226, F16F 106, C23C 822

Patent

active

060243465

ABSTRACT:
By controlling the thickness of the nitrization layer formed on the surface, the coil spring made of spring steel may be made highly resistant to permanent set and fatigue. By carbonitriding the material of the coil spring to a depth of 20 to 50 .mu.m from the surface thereof so as to have an internal hardness of Hv 540 or higher, the coil spring can be made to endure 10.sup.7 cycles of repeated high stress without suffering any significant permanent set.

REFERENCES:
patent: 5665179 (1997-09-01), Izawa et al.
patent: 5683521 (1997-11-01), Matsumoto et al.

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