Electromagnetic valve utilizing a permanent magnet

Details Electromagnetic valve utilizing a permanent magnet Electromagnetic valve utilizing a permanent magnet

1989-04-12

1990-08-07

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

188282, 25112905, F16F 946

Patent

active

049460099

ABSTRACT:
A valve has a magnetic drive unit axially spaced from a valve section. An axially movable armature is moved by an electromagnet and an annular permanent magnet having radial magnetization. Reciprocation of the armature opens and closes a poppet valve to regulate fluid flow between two chambers. The magnetic characteristics of the magnetic drive unit are such that the armature remains in either of two axial limit positions when current is not being applied to the electromagnetic coils. In order to compensate for fluid flow forces tending to close the poppet when open, a biasing spring is also used to help overcome these forces. In an embodiment applied to vehicle shock absorbers, an orifice plate and disc springs are used adjacent the poppet structure to permit damping characteristics which vary depending on whether the piston or the shock absorber is compressing or rebounding.

REFERENCES:
patent: 3740594 (1973-06-01), Casey
patent: 3809123 (1974-05-01), Heimann
patent: 4127835 (1978-11-01), Knutson
patent: 4605197 (1986-08-01), Casey et al.
patent: 4682675 (1987-07-01), Eddy, Jr.
patent: 4749069 (1988-04-01), Knecht et al.
patent: 4774976 (1988-10-01), Janecke et al.
patent: 4794890 (1989-01-01), Richoson, Jr.
patent: 4854429 (1989-08-01), Casey

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