Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1996-04-05
1998-04-14
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
188315, 18832219, F16F 948, F16F 9516, B60G 1708
Patent
active
057381917
ABSTRACT:
A vibration damper having a pressure tube in which a piston with a piston rod is located so that the piston can move axially. The pressure tube is divided into upper and lower working chambers. The upper working chamber is connected by a hydraulic connection to the oil sump of an equalization chamber. The vibration damper also has at least one damping valve in the piston at least for the direction of flow from the upper working chamber to the lower working chamber, a port valve between a connection opening in the upper working chamber and the oil sump, a non-return valve in a bottom valve body which connects the lower working chamber with the equalization chamber and at least one additional damping valve in addition to the piston valve(s). In the insertion direction, the additional damping valve produces a damping which occurs as a function of the volume flow distribution. As a result of the flow resistances in the valves, there is a superimposed pressure damping of the valves, whereby a maximum of the displaced volume of the lower work chamber and a minimum of the volume displaced by the piston rod flows through the damping valve. The flow resistance inside the hydraulic connection in the direction of flow from the oil sump into the upper working chamber through a directionally-dependent port valve is less than in the opposite direction of flow.
REFERENCES:
patent: 2738036 (1956-03-01), Crabtree
patent: 4266639 (1981-05-01), Schloth
patent: 4971180 (1990-11-01), Kobayashi et al.
Butler Douglas C.
Fichtel & Sachs AG
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