Patent ID: 9328792
Filing Date: 2016-05-03
CPC Classification: F16F

Claim Text:
1. A hydraulic shock absorber comprising: a cylinder; a piston rod that is partially inserted into the cylinder; a piston that is fixed to an end portion of the piston rod facing the inside of the cylinder and is brought into sliding contact with an inner circumference of the cylinder; a damping force generation unit; and a damping force adjustment unit, wherein the damping force adjustment unit comprises: a push rod that changes an opening area of an oil path formed in the piston rod; an electric motor functioning as a driving source; and a feed screw mechanism that converts rotation of the electric motor into linear movement of the push rod, and wherein the feed screw mechanism comprises: a first slider that is screwed to an output shaft of the electric motor in an advanceable/retractable manner; a second slider is fitted movably to the first slider; and a set spring that pushes the second slider against one end of the push rod.