Patent Number: 9,970,505

Title: Shock absorber

Abstract: Shock absorber including a suction passage allowing flow only from a reservoir towards a pressure side chamber, a rectifying passage allowing flow only from the pressure side chamber towards an expansion side chamber, and a damping force variable valve allowing flow only from the expansion side chamber towards the reservoir. A large pressure-side pressure chamber communicating with the pressure side chamber, and an outer peripheral expansion-side pressure chamber communicating with the expansion side chamber sandwich a free piston slidably moving within a bottom housing forming a pressure chamber. Because a pressure-side pressure-receiving area of the free piston is larger than an expansion-side pressure-receiving area in a contraction operation in which a piston moves downward, the free piston can move downward even in a uniflow-type shock absorber in which pressure in the expansion side and pressure side chambers become equal whereby damping force can be reduced during an input of high-frequency vibration.

Inventors: Teraoka; Takashi (Gifu, JP), Masamura; Tatsuya (Gifu, JP)

Assignee: KYB Corporation

International Classification: F16F 9/516 (20060101); F16F 9/06 (20060101); F16F 9/18 (20060101); F16F 9/34 (20060101); F16F 9/512 (20060101)

Expiration Date: 2022-05-15 0:00:00