| 摘要 |
A hydraulic shock absorber is disclosed which includes a stationary cylinder, a piston arranged to move within the cylinder in directions of extension and retraction, a fluid tank and a multiple valve for controlling the flow of fluid between the cylinder and the tank. The multiple valve comprises a stationary valve partition element having openings forming parts of two ducts for the flow of fluid during piston extension and retraction, respectively; a thrust collar, arranged adjacent and movable axially with respect to the partition element, having openings forming parts of the two ducts; a tie rod extending through one of the ducts; a valve plate retained at one end of the tie rod against the thrust collar and forming the closing body of a suction valve with respect to the thrust collar for a flow of fluid through the one duct; a closing coil spring retained at the opposite end of the tie rod; a ring plate resiliently retained by the coil spring against the partition element and forming the closing body of an auxiliary valve with respect to the partition element for the flow of fluid through the other duct; and at least one flat spring disc arranged between the partition element and the thrust collar forming the closing body of a working valve with respect to the thrust collar for the flow of fluid through the other duct. The working valve determines the operating characteristic of the shock absorber while the auxiliary valve opens only during piston retraction.
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