Vehicle pneumatic spring damper unit

摘要

The unit comprises valves (14), between displacement chambers (5,6), which are controlled as a linear and/or non-linear function of the valve lift speed and/or spring travel. In this way, the valves open at low or decreasing pressure gradient at low valve fit speed but only under high pressure gradient at higher lifting speed. The valves open under a pressure gradient which increases with increasing distance from the centre position. The transfer channels (9) are controlled in part at least by valves, using magnetisable valve spring plates as shutoff. In this way, the plate co-operates with the contact surfaces (15,16) whose closing force depends on the variable electrical load applied to the magnet (17) whose flux (F) travels over the contact surfaces and valve plates (14). Otherwise, the valve closing force is controlled by a single electric magnet which works in parallel to a permanent magnet and sets up fields which are directed with or against those produced by the permanent magnet.