SHOCK ABSORBER

摘要

A shock absorber includes: a damping valve that suppresses a flow of operating fluid due to the sliding of a piston to generate damping force; a bottomed tubular pilot case that forms a pilot chamber that causes pressure to act on the damping valve in a valve closing direction, together with the damping valve; and an annular seal member (146) that is provided to be fixed to the outer circumferential side of a rear surface of the damping valve, and is fitted into a tube of the pilot case so as to be slidable and to be in a liquid tight manner. A part of the flow of the operating fluid is guided to the pilot chamber and opening of the damping valve is suppressed by the pressure of the pilot chamber. An annular concave portion (380) is formed on the outer circumferential side of the seal member (146), and an annular convex portion (385) is formed on the inner circumferential side of the seal member (146).

主权项

1. A shock absorber comprising:
a cylinder in which operating fluid is enclosed; a piston that is slidably fitted into the cylinder; a piston rod of which a first end side is coupled to the piston and a second side extends to the outside of the cylinder; a damping valve that suppresses a flow of the operating fluid due to the sliding of the piston to generate damping force; a bottomed tubular pilot case that forms a pilot chamber that causes pressure to act on the damping valve in a valve closing direction, together with the damping valve; and an annular seal member that is provided to be fixed to the outer circumferential side of a rear surface of the damping valve, and is fitted into a tube of the pilot case so as to be slidable and to be in a liquid tight manner, wherein the damping valve is configured such that the inner circumferential side of the damping valve is clamped and the outer circumferential side of the damping valve is opened, wherein a part of the flow of the operating fluid is guided to the pilot chamber and opening of the damping valve is suppressed by the pressure of the pilot chamber, wherein an annular concave portion is formed on the outer circumferential side of the seal member, wherein an annular convex portion is formed on the inner circumferential side of the seal member, and wherein a maximum diameter portion having the largest diameter is formed on the outer circumferential side of the seal member further on a side separating from the damping valve than the annular concave portion, and a damping-valve-side convex portion that protrudes further outward in a radial direction than the maximum diameter portion is provided on the damping valve side of the seal member.