Hydraulic shock absorber for a motor vehicle having flow control

Details Hydraulic shock absorber for a motor vehicle having flow control Hydraulic shock absorber for a motor vehicle having flow control

1975-11-12

1977-07-19

Blix, Trygve M.

Brakes

Internal-resistance motion retarder

Resistance alters relative to direction of thrust member

188317, F16F 950

Patent

active

040363198

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 in friction damping in the suspension during usage. The piston valving includes a flow passage surrounded at one of its ends by an annular land that forms a valve seat. A valve element is urged to a closed position against the seat by the cumulative force of a primary spring and a secondary spring. The secondary spring provides a spring force countering the force of the primary spring but is constructed to progressively take a permanent set after repeated cycling whereby the cumulative force of the two springs urging the valve element to a seated condition will increase during the service life of the shock absorber.

REFERENCES:
patent: 2732039 (1956-01-01), Funkhouser et al.
patent: 2740500 (1956-04-01), Brundrett et al.
patent: 3470986 (1969-10-01), Whisler, Jr.
patent: 3874487 (1975-04-01), Keijzer et al.

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