Double-tube vibration damper

Details Double-tube vibration damper Double-tube vibration damper

1986-12-31

1988-11-08

Kashnikow, Andres

Brakes

Internal-resistance motion retarder

Valve structure or location

188284, 188315, 267 6411, F16F 949

Patent

active

047829257

ABSTRACT:
In a double-tube vibration damper the flow of liquid from the lower working chamber to the reservoir chamber is controlled by a bottom valve. This bottom valve has additionally the function of hydraulic abutment for the piston rod when the piston rod approaches its innermost position. An abutment spring is connected with the inner end of the piston rod. This abutment spring cooperates with a control body being a part of the bottom valve and being urged towards a minimum damping position by a return spring. When the abutment spring abuts against the control body at a predetermined position of inward movement of the piston rod the control body is displaced towards a maximum damping position. The control body cooperates with a flow passage. Various embodiments of the flow passage are proposed in order to vary the characteristics of the bottom valve with respect to its function as hydraulic abutment.

REFERENCES:
patent: 4076276 (1978-02-01), Wijnhoven et al.
patent: 4401196 (1983-08-01), Grundei
patent: 4650043 (1987-03-01), Eckersley

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