Controllable vibration damper
AssigneeAlfred Teves GmbH
InventorsHans-Christof Klein, Peter Lohberg
Life of this patent
Estimating the term…
Abstract
A controllable vibration damper for automotive vehicles is disclosed having a damping piston which is axially slidably and sealedly guided in a damping tube, and which subdivides the damping tube filled with a damping medium into two working chambers. The connection between the two working chambers is provided with at least one non-regulated first valve and at least one controllable second valve, which valves are arranged acting hydraulically in parallel in respect to one another. In order to be able to regulate the effective damping force continuously in wide ranges, for the adjustment of damping hardness, the controllable valve will periodically open and close in rapid sequence in dependence upon pulsed control signals.
Claims14
A controllable vibration damper for an automotive vehicle comprising:
- a damping tube;
- a damping piston axially slidable and sealedly guided in the damping tube, the piston dividing the tube into two working chambers;
- at least one first valve in a first flow passage between the two working chambers, said first valve being biased to a closed position;
- at least one controllable second valve in a flow passage between the two working chambers for periodically opening and closing, said first and second valve being arranged hydraulically in parallel with one another and each of said valves providing a different damping force characteristic so that the opening and closing of the second valve influences the opening of the first valve and adjusts the damping characteristic of the damper through a range defined by the two different damping force characteristics, wherein the ratio of the valve opened time to valve closed time of the second valve is adjustable for responding to a constant frequency signal.
A controllable vibration damper for an automotive vehicle comprising:
- a damping tube;
- a damping piston axially slidable and sealedly guided in the damping tube, the piston dividing the tube into two working chambers;
- at least one first valve in a first flow passage between the two working chambers, said first valve being biased to a closed position;
- at least one controllable second valve in a flow passage between the two working chambers for periodically opening and closing, said first and second valve being arranged hydraulically in parallel with one another and each of said valves providing a different damping force characteristic so that the opening and closing of the second valve influences the opening of the first valve and adjusts the damping characteristic of the damper through a range defined by the two different damping force characteristics, wherein the ratio of the valve opened time to valve closed time of the second valve is maintained constant for responding to a changeable frequency signals.
Dependencies are inferred from the claim text.