Patent ID: 6659242
Filing Date: 2003-12-09
Classification: F16F

Abstract:
A hydraulic shock absorber for a vehicle comprising,an inner tube slidably insertable within an outer tube via bushes which are respectively fixed to an opening portion in an inner periphery of the outer tube and a front end portion in an outer periphery of the inner tube; a sectioned annular oil chamber which is surrounded by the inner periphery of the outer tube, the outer periphery of the inner tube and the two bushes; a partition member disposed in an inner periphery of the inner tube so as to section an oil chamber in a lower portion and section an air chamber in an upper portion; a piston rod which is mounted to the outer tube and which is slidably insertable to the partition member; a piston which is slidably in contact with the inner periphery of the inner tube and which is fixable to a front end portion of the piston rod which is inserted to the inner tube so as to section the oil chamber into a piston rod side oil chamber in which the piston rod is received and a piston side oil chamber in which the piston rod is not received; and the annular oil chamber being in fluid communication with the piston rod side oil chamber or the piston side oil chamber via an oil hole which is provided in the inner tube, wherein a cross sectional area of the annular oil chamber is formed larger than a cross sectional area of the piston rod, a check valve which inhibits a flow from the oil chamber into the oil storage chamber at a time of an expansion side stroke is provided in the partition member, and a micro flow passage which passes through the oil chamber and the oil storage chamber is provided in the partition member.