| 摘要 |
<p>The present invention provides a vehicle suspension device comprising an actuator (11) having a piston (12) within a cylinder (13), which piston (12) divides the cylinder (13) into at least two chambers (A and B), a first surface of the piston (12) acting in a first chamber (B) of the cylinder being of smaller area than the second surface of the piston (12) acting in a second chamber (A). The device also comprises a source of pressurised fluid (16), an exhaust for pressurised fluid (19) and valve means (30). The valve means (30) has first and second operating conditions. In the first operating condition the valve means (30) connects the first chamber (B) to the source of pressurised fluid (16) and selectively connects the second chamber (A) to either the source of pressurised fluid (16) or the exhaust for pressurised fluid (19), the valve means (30) metering the flow of fluid into or out of the second chamber (A) to control piston movement. In the second operating condition the valve means (30) connects the second chamber (A) to the source of pressurised fluid (16) and connects the first chamber (B) to the exhaust for pressurised fluid (19), the valve means metering flow of fluid from the first chamber (B) to control piston movement. In a preferred embodiment the actuator (11) supports some of the static weight of the vehicle in conjunction with resilient means (35).</p> |
