| 摘要 |
<p>923,789. Hydraulic shock-absorbers. RHEINMETALL G.m.b.H. July 8, 1959 [July 24, 1958], No. 23534/59. Class 108(3). A valve for an hydraulic shock-absorber comprises an apertured plate 5 Fig. 1, and a flap 11 having different coefficients of thermal expansion so that the effective area of the apertures 9 is varied with temperature. The apertures 9 Fig. 3 may be of various shapes so that the rate of change of area may be varied according to required characteristics, the arrangement shown producing a sudden increase in damping at a predetermined temperature and leaving pilot apertures 17 at maximum temperatures. The flap 11 is preferably of non-metallic material such as synthetic plastic. Pairs of apertured plates 5, 5<SP>1</SP> may form part of a shockabsorber piston, carrying piston rings 8, the flaps 11 being retained against the plate 5 by helical springs 12 engaged under flanges of the rings 8. Additional passages 10 may be provided in the plates 5 and are controlled by flap valves 13 made of bi-metal so that they also have variable characteristics. Passages 14 in intermediate washers 7 provide for the flow of oil through passages 16 in the hollow piston rod 2 which is connected to a compensating chamber. In a modification Fig. 5 (not shown) the plates 5 may comprise two rotatbly adjustable parts so that the effective area of the apertures 9 may be preset according to requirements.</p> |
