Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1995-07-06
1997-12-23
Poon, Peter M.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
18832215, F16F 934
Patent
active
056998856
ABSTRACT:
Vibration damper with adjustable damping force, comprising a pressure tube filled with damping medium, in which a piston on an axially movable piston rod divides a work chamber into a chamber closer to the piston rod and a chamber farther from the piston rod, whereby there is a flow of damping medium between the two work chambers, which flow is divided into a main stream and side stream, a damping valve device consisting of a damping valve body with one main damping valve in each direction of flow, each of which is formed by a main stage valve body and a pilot stage valve which actuates the main stage valves, an adjustable actuator which controls a flow connection between a control chamber and a work chamber, and the main stage valve carries the flow of the main stream and the pilot stage valve carries the flow of the side stream in both directions of flow, characterized by the fact that the side stream in the pilot, stage valve flows through a non-return valve system, that the pilot stage valve has two control cross sections which can be controlled in alternation, and the side stream, as a function of the direction of flow, passes a control cross section and a non-return valve which opens in the direction of flow.
REFERENCES:
patent: 3365033 (1968-01-01), Willich
patent: 3756357 (1973-09-01), Graff et al.
patent: 5150775 (1992-09-01), Charles et al.
Fichtel & Sachs AG
Poon Peter M.
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