Patent ID: 9291229
Filing Date: 2016-03-22
CPC Classification: F16F

Claim Text:
1. A shock absorber comprising: an outer tube; an annular cylinder in which hydraulic fluid is sealingly contained and that is disposed in the outer tube; a reservoir chamber in which hydraulic fluid and gas are sealingly contained; a piston slidably and fittedly inserted in the cylinder and dividing an interior of the cylinder into a rod-side chamber and an opposite rod-side chamber; a piston rod extending from one end of the cylinder to an outside; and a rod guide disposed at one end side of the cylinder and configured to slidably support the piston rod, wherein the cylinder includes a piston sliding portion on which the piston slides, and a large-diameter portion provided integrally with the piston sliding portion at one end side of the piston sliding portion so as to have a diameter increased radially outwardly, the piston sliding portion has an inner diameter and an outer diameter, the large-diameter portion has an inner diameter and an outer diameter, the inner diameter of the large-diameter portion is larger than the inner diameter of the piston sliding portion, the outer diameter of the large-diameter portion is larger than the outer diameter of the piston sliding portion, the large-diameter portion being supported by the rod guide by being fitted to the rod guide so that the one end side of the cylinder is positioned relative to the outer tube, a passage is provided at the rod guide so as to establish communication between the rod-side chamber and the reservoir chamber, and a valve mechanism is disposed at the passage.