HYDRAULIC SHOCK ABSORBER AND METHOD FOR INJECTING OPERATING LIQUID INTO HYDRAULIC SHOCK ABSORBER

摘要

A hydraulic shock absorber includes a cylinder connected to a wheel side, a liquid chamber formed in the cylinder and filled with an operating liquid, an annular rod guide fixed to the cylinder and closing a vehicle body side of the liquid chamber, a piston rod connected to the vehicle body side, penetrating a shaft core part of the rod guide, and going into/out of the cylinder, a piston held by the piston rod and dividing the liquid chamber into an extension-side chamber and a compression-side chamber, and an annular bush fitted in an inner periphery of the rod guide and pivotally supporting the piston rod, movably in an axial direction, in which the piston rod includes a columnar sliding shaft portion in sliding contact with the bush and a first injection portion for injecting the operating liquid provided on a side opposite to the piston of the sliding shaft portion and outside a range of a damper stroke.

主权项

1. A hydraulic shock absorber interposed between a vehicle body and a wheel, comprising:
a cylinder connected to the wheel side; a liquid chamber formed in the cylinder, the liquid chamber being filled with an operating liquid; an annular rod guide fixed to the cylinder, the rod guide closing the vehicle body side of the liquid chamber; a piston rod connected to the vehicle body side, the piston rod penetrating a shaft core part of the rod guide, the piston rod going into/out of the cylinder; a piston held by the piston rod, the piston dividing the liquid chamber into an extension-side chamber and a compression-side chamber; and an annular bush fitted in an inner periphery of the rod guide, the bush pivotally supporting the piston rod movably in an axial direction, wherein the piston rod includes: a columnar sliding shaft portion contacting slidably with the bush; and a first injection portion configured to inject the operating liquid, the first injection portion being provided on a side opposite to the piston of the sliding shaft portion and outside a range of a damper stroke.