Patent ID: 8079598
Filing Date: 2011-12-20
Classification: F16F,Y10S

Abstract:
1. A check seal structure for a hydraulic shock absorber for discharging working oil in an oil pool which temporarily stores working oil scraped off a piston rod, to an oil reservoir located outside the oil pool while preventing working oil from flowing into the oil pool from the oil reservoir, comprising: an annular seat surface formed on the outside of the oil pool; an annular lip seated resiliently on the seat surface in a state where a tip of the annular lip points outward; a main rib having a circular form and projecting from the seat surface towards the annular lip; an inner rib provided on the inside of the main rib and projecting from the seat surface towards the annular lip, the main rib and the inner rib forming an annular groove therebetween; and a notch formed in the inner rib to introduce a pressure in the oil pool into the annular groove.