Title: Shock absorber for motor vehicle

Abstract: A shock absorber for a motor vehicle suspension includes a piston construction having flow control valving that becomes more restrictive during the life of the shock absorber to compensate for the reduction of friction damping in the suspension during usage. The piston valving includes a flow control passage and an annular land which forms a valve seat about one end of the passage. A valve element having an organic material on one face engages the land. A restrictive orifice is provided by either a recess in the facing material or a recess in the land. During the life of the shock absorber, the organic material will be plastically deformed and the restrictive orifice will be progressively closed whereby resistance to the movement of the shock absorber piston will be gradually increased during the life of the shock absorber.

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Inventors: Andre, Lee R. (Tecumseh, MI, US)

Application Number: 631251
Filing Date: 1975-11-12
Publication_date: 1976-09-21
Assignee: Ford Motor Company (Dearborn, MI)
Primary Class(es): 188/282.9 188/319.1, 188/322.15
Other Classes:
US Patent Ref:

2732039	Jan, 1956	Funkhouser et al.	188/282.
2740500	Apr, 1956	Brundrett et al.	188/322.
3470986	Oct, 1969	Whisle, Jr.	188/317.
3874487	Apr, 1975	Keijzer et al.	188/322.

Other Refs:
Primary Examiner: Kunin, Stephen G.
Assistant Examiner: Butler, Douglas C.
Attorney: Sadler; Clifford L., Zerschling; Keith L.