Hydraulic vehicle seat adjustment with system protection valve
First Claim
1. A hydraulic vehicle seat adjustment system for providing powered adjustment of the position of a seat or seat portion, the system comprising arranged in a hydraulic circuit:
- a pump for generating a flow of pressurised hydraulic fluid;
a flow controller for controlling and directing the flow of pressurised hydraulic fluid; and
a hydraulic actuator comprising a first inlet/outlet and a second inlet/outlet, the actuator adapted to move the seat portion in response to a flow of pressurised hydraulic fluid directed to and from the first inlet/outlet and second inlet/outlet by the flow controller;
wherein the actuator comprises a first system protection valve for the first inlet/outlet of the actuator and second system protection valve for the second inlet/outlet of the actuator;
the first and second system protection valves are adapted to be activated in response to pressure within the actuator exceeding a predetermined threshold level, and when activated are adapted to at least partially close off the respective inlet/outlet to hydraulically isolate the actuator and hydraulic fluid within the actuator from the remainder of the hydraulic circuit and adjustment system.
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Accused Products
Abstract
A hydraulic vehicle seat system providing powered adjustment of the position of a seat or seat portion. The system comprises a pump, flow controller, and hydraulic actuator arranged in a hydraulic circuit. The actuator includes a first and second system protection valves for the respective inlet and outlet of the actuator. The system protection valves are adapted to be activated in response to pressure within the actuator exceeding a predetermined threshold level. When activated the system protection valves close off the respective inlet and outlets to hydraulically isolate the actuator and hydraulic fluid within the actuator from the remainder of the hydraulic circuit and adjustment system. This protects the remainder of the circuit and system from excessive pressures which may be generated within an by the actuators under crash loading.
27 Citations
15 Claims
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1. A hydraulic vehicle seat adjustment system for providing powered adjustment of the position of a seat or seat portion, the system comprising arranged in a hydraulic circuit:
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a pump for generating a flow of pressurised hydraulic fluid; a flow controller for controlling and directing the flow of pressurised hydraulic fluid; and a hydraulic actuator comprising a first inlet/outlet and a second inlet/outlet, the actuator adapted to move the seat portion in response to a flow of pressurised hydraulic fluid directed to and from the first inlet/outlet and second inlet/outlet by the flow controller; wherein the actuator comprises a first system protection valve for the first inlet/outlet of the actuator and second system protection valve for the second inlet/outlet of the actuator;
the first and second system protection valves are adapted to be activated in response to pressure within the actuator exceeding a predetermined threshold level, and when activated are adapted to at least partially close off the respective inlet/outlet to hydraulically isolate the actuator and hydraulic fluid within the actuator from the remainder of the hydraulic circuit and adjustment system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification