Shock absorber

Details Shock absorber Shock absorber

1989-10-30

1990-12-04

Halvosa, George E. A.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

137246, 137599, 188319, 18832215, 25112921, 280714, F16F 934

Patent

active

049747070

ABSTRACT:
A shock absorber with a variable damping characteristic has a piston which is reciprocable in a cylinder to divide the oil-filled internal space of the cylinder into two chambers. The chambers are connectable to each other by one or more passages so that oil can flow between the chambers in response to movement of the piston relative to the cylinder and/or vice versa. The piston has several bypasses each of which is controlled by an adjustable electrically operated regulating valve. In order to enhance the accuracy of regulation of flow of oil between the chambers by way of the bypasses, the piston is formed with channels which supply oil between the mobile valving elements and the seats of the valves to thus reduce or eliminate friction between such parts. The films of oil between the valving elements and the respective seats from hydrostatic bearings which ensure that the valving elements can leave their open or closed positions, as well as that the valving elements can move between such positions, with a high degree of predictability and faster than in heretofore known regulating valves. The valving elements can be disposed one behind the other in the axial direction of the piston. Alternatively, at least one valving element can surround at least one other valving element. All valving elements can be mounted for movement relative to a single common seat.

REFERENCES:
patent: 1926790 (1933-09-01), Ploen
patent: 3086622 (1963-04-01), Schultze
patent: 3419113 (1968-12-01), Shelley
patent: 4504039 (1985-03-01), Akagi
patent: 4620619 (1986-11-01), Emura et al.
patent: 4671392 (1987-06-01), Wossner
patent: 4681143 (1987-07-01), Sato et al.
patent: 4696379 (1987-09-01), Yamamoto et al.
patent: 4726453 (1988-02-01), Obstfelder et al.
patent: 4749069 (1988-06-01), Knecht et al.
patent: 4765445 (1988-08-01), Komossa et al.
patent: 4800995 (1989-01-01), Bernhardt et al.
patent: 4858736 (1989-08-01), Arnaud et al.

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