US 12,384,220 B2
Fluid pressure shock absorber
Kazuki Hasegawa, Gifu (JP)
Assigned to KYB CORPORATION, Tokyo (JP)
Appl. No. 18/844,332
Filed by KYB Corporation, Tokyo (JP)
PCT Filed Mar. 1, 2023, PCT No. PCT/JP2023/007662
§ 371(c)(1), (2) Date Sep. 5, 2024,
PCT Pub. No. WO2023/171508, PCT Pub. Date Sep. 14, 2023.
Claims priority of application No. 2022-035295 (JP), filed on Mar. 8, 2022.
Prior Publication US 2025/0178398 A1, Jun. 5, 2025
Int. Cl. B60G 13/08 (2006.01); B60G 17/08 (2006.01)
CPC B60G 17/08 (2013.01) [B60G 13/08 (2013.01); B60G 2202/24 (2013.01); B60G 2202/415 (2013.01); B60G 2204/62 (2013.01); B60G 2206/41 (2013.01); B60G 2500/104 (2013.01); B60G 2500/114 (2013.01); B60G 2600/21 (2013.01); B60G 2800/162 (2013.01); B60G 2800/916 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A fluid pressure shock absorber mounted on a vehicle, comprising:
a cylinder tube;
a rod inserted into the cylinder tube so as to be movable back and forth;
a piston connected to the rod and dividing an interior of the cylinder tube into a bottom-side chamber and a rod-side chamber;
a damping valve configured to impart resistance to a flow of working fluid between the bottom-side chamber and the rod-side chamber, the damping valve being capable of changing damping characteristic in response to a pilot pressure; and
a pilot valve configured to supply the working fluid in the bottom-side chamber or the rod-side chamber to a pilot chamber of the damping valve as a pilot pressure, wherein
the pilot valve has:
a first pilot chamber configured such that the working fluid is guided from the bottom-side chamber; and
a second pilot chamber provided so as to be opposed to the first pilot chamber, the second pilot chamber being configured such that the working fluid is guided from the rod-side chamber,
when the fluid pressure shock absorber is not extended or contracted, the pilot valve supplies the pilot pressure to the pilot chamber of the damping valve, and
when the fluid pressure shock absorber is extended or contracted, the pilot valve holds the pilot pressure in the pilot chamber of the damping valve supplied when the fluid pressure shock absorber is not extended or contracted.