US 12,410,847 B2
Shock absorber
Takamasa Kotani, Hitachinaka (JP); Kentaro Yamada, Hitachinaka (JP); and Mikio Yamashita, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Ibaraki (JP)
Appl. No. 18/017,861
Filed by Hitachi Astemo, Ltd., Ibaraki (JP)
PCT Filed Jul. 14, 2021, PCT No. PCT/JP2021/026439
§ 371(c)(1), (2) Date Jan. 25, 2023,
PCT Pub. No. WO2022/024759, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 2020-128095 (JP), filed on Jul. 29, 2020.
Prior Publication US 2023/0272835 A1, Aug. 31, 2023
Int. Cl. F16F 9/512 (2006.01); F16F 9/18 (2006.01); F16F 9/34 (2006.01); F16F 9/348 (2006.01); B60G 13/08 (2006.01); B60G 17/08 (2006.01)
CPC F16F 9/341 (2013.01) [F16F 9/185 (2013.01); F16F 9/348 (2013.01); F16F 9/512 (2013.01); B60G 13/08 (2013.01); B60G 17/08 (2013.01); B60G 2202/24 (2013.01); B60G 2204/62 (2013.01); B60G 2206/41 (2013.01); B60G 2500/11 (2013.01); B60G 2600/21 (2013.01); B60G 2800/162 (2013.01); F16F 2222/12 (2013.01); F16F 2228/066 (2013.01); F16F 2232/08 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A shock absorber comprising:
a cylinder in which a working fluid is sealed;
a piston provided to be slidable in the cylinder and partitioning an inside of the cylinder into two chambers;
a piston rod connected to the piston and extending to an outside of the cylinder;
a passage through which a working fluid flows from the chamber on an upstream side to the chamber on a downstream side in the cylinder due to movement of the piston;
a first damping force generation mechanism provided in the passage formed in the piston to generate a damping force; and
a second damping force generation mechanism disposed separately from the first damping force generation mechanism and provided in the piston rod, wherein
the second damping force generation mechanism includes:
a valve seat member;
a sub-valve provided in the valve seat member; and
a cap member covering one end side of the second damping force generation mechanism and at least a part of an outer circumference of the valve seat member, and
on one end side of the cap member,
a communication passage which allows the inside and outside of the cap member to communicate is formed, and
a biasing member provided so that one end surface side is in contact with an outer circumferential side of the cap member with respect to the communication passage, and a bendable flexible disc provided so that the other end surface of the biasing member is in contact therewith are disposed.