SHOCK ABSORBER VALVE WITH SPRING ARRANGEMENT

摘要

The invention relates to a valve (1 ) intended to adjust the pressure of a damping medium flow between the damping chambers of a shock absorber, in which the damping medium flow is regulated by the force equilibrium of one or more valve parts (4) which are axially movable in a valve housing (2). The force equilibrium is partially or mainly created by a damping medium pressure which is dependent on the damping medium flow and acts upon the movable valve part (4) counter to the action of a spring arrangement comprising a stiff (5) and a weak spring (6). The weak spring (6) has the form of a thin, circular disc having a first (6') and a second spring surface (6"), and an inner (6a) and an outer (6b) spring part substantially separated from each other with cavities (6c), yet at two points, at least, connected with legs (6d). The effect of the connection is that the outer (6b) and the inner (6a) spring part can deflect in relation to each other. When the valve part (4) moves by no more than a path length (S), the force equilibrium of the valve part (4) is adjusted counter to the action of said deflection motion between the outer (6b) and the inner spring part (6a) and, in the event of shifts beyond this path length (S), the force equilibrium is adjusted counter to the action of the stiff spring (5). The weak spring (6) has a dual function and ensures a low spring constant at the start of a motion, at the same time as wear to the inside of the valve is prevented.