Use of a displacement machine as a pressure control valve
OwnerMagnus Lizellinventor
Life of this patent
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Abstract
A valve for controlling a liquid in an hydraulic vehicle shock absorber includes a displacement machine mounted within a passageway in a piston moveable in a cylinder of the shock absorber. The displacement machine includes at least one operative body rotatable by flow of the liquid. A brake is provided for braking the movement of the rotatable body of the displacement machine thereby causes a reduction in the flow velocity of the liquid passing through the valve and a desired damping force. The brake is actuated by an actuating unit.
Claims15
A pressure control valve and shock absorber combination for controlling a liquid flow in a hydraulic shock absorber, the pressure control valve comprising:
- a displacement machine mounted within a passageway of a piston moveable in a cylinder of the shock absorber, the displacement machine comprising at least one operative body rotatable by flow of the liquid;
- a brake for braking the movement of said rotatable body of the displacement machine to reduce the flow velocity of the liquid passing through the valve;
- and
- means for actuating the brake.
A hydraulic shock absorber, comprising:
- a cylinder housing;
- a working fluid contained within the shock absorber;
- a piston movable within said cylinder and provided with at least one passageway therethrough for flow of the fluid;
- a valve apparatus arranged within the passageway for controlling the fluid flow, the valve apparatus comprising a positive displacement machine including at least one operative body rotated by the fluid flow;
- and
- means for braking the motion of the at least one operative body, to create a desired damping force on the fluid flow.
A method of controlling fluid flow in a hydraulic shock absorber to provide a direct proportional pressure control and a desired damping force, the method comprising the steps of:
- mounting a valve comprising a displacement machine including at least one operative body rotatable by the flow of the fluid within a piston of a cylinder of the shock absorber;
- actuating means for braking the movement of the rotatable body of the displacement machine in response to a pressure sensed by a pressure sensor located inside the cylinder to reduce the flow velocity of the fluid passing through the valve.
Dependencies are inferred from the claim text.