| 摘要 |
<p>A spring and damper unit (10) comprises two telescopically movable housings (11, 12) bounding an interior space formed by a cavity (16) in one of the housings and a cavity (23) in the other housing, and a floating piston (24) disposed in one of the cavities (23) and dividing the interior space into a spring chamber (27) containing a gaseous medium such as air and a damping chamber (26) containing a damping fluid such as hydraulic oil, the housings being movable together in a compression stroke thereof to compress the gaseous medium through reduction in the volume of the spring chamber (27) and the piston (24) being movable by the compressed gaseous medium to cause a reduction in the volume of the damping chamber (26) for displacement of fluid therefrom. The spring thus has a dual function in the unit. In addition, the walls (15; 19/20) of the housings are each provided with a respective one of two oppositely directed projections (28, 29; 31, 32) which together with substantially concentric portions of the walls bound a further damping chamber (33) for receiving the displaced fluid. These projections are movable towards another, on movement of the housings (11, 12) apart in a rebound stroke thereof, so as to cause a reduction in the volume of the second damping chamber (33) for expulsion of fluid to be returned under positive pressure to the first damping chamber (26).</p> |
