Patent ID: 8776965
Filing Date: 2014-07-15
Classification: F16F

Abstract:
1. A shock absorber that absorbs a vibration using a working fluid charged into a first chamber and a second chamber and comprises a tube body, an inserted body, a tip end of which is inserted into the tube body from an end portion of the tube body, and a partition wall portion that is provided on the tip end of the inserted body to be capable of sliding within the tube body and partitions an interior of the tube body into the first chamber and the second chamber in a non-communication state, the shock absorber comprising: a rod formed to project from the end portion of the tube body; an insertion hole formed in the partition wall portion and penetrated by the rod; an inside seal that is provided in the insertion hole and contacts an outer peripheral surface of the rod slidingly; and a connecting portion that is formed as an annular groove by indenting the outer peripheral surface of the rod and is configured to connect temporarily the first chamber and the second chamber when the inside seal of the partition wall portion passes the connecting portion, wherein air is charged into the first chamber and the second chamber as the working fluid, the shock absorber further comprising: an inside chamber formed in an interior of the inserted body; and an outside chamber defined by the tube body, the partition wall portion, and the inserted body so as to communicate with the inside chamber via a connecting hole provided in the inserted body, wherein the second chamber is constituted by the inside chamber and the outside chamber, the shock absorber further comprising: a damper cylinder formed in the interior of the inserted body and filled with a working oil; and a piston that is provided on an end portion of the rod to be capable of sliding through the damper cylinder and partitions an interior of the damper cylinder into a rod side oil chamber and a piston side oil chamber, wherein the piston and the damper cylinder constitute a hydraulic damper mechanism that generates a damping force for damping the vibration.