Granted Patent B2

US 12,435,771 · App. 18/017,864 · Granted Oct 7, 2025

Inventors: Mikio Yamashita (Hitachinaka, JP); Takamasa Kotani (Hitachinaka, JP)

Assignee: HITACHI ASTEMO, LTD.

F16F9/3482F16F9/5126F16F2222/12F16F2232/08

Abstract

Claims (33)

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;

a second damping force generation mechanism disposed separately from the first damping force generation mechanism and provided on the piston rod; and

a fluid storage mechanism disposed separately from the second damping force generation mechanism and provided on the piston rod, wherein

the fluid storage mechanism includes:

a flexible disc which deforms before the second damping force generation mechanism opens; and

a plate-shaped biasing member

having a hole portion formed as a flow path of the working fluid between an inner circumferential end portion and an outer circumferential end portion,

being inserted with the piston rod at the inner circumferential end portion, and

being fixed to the piston rod, and wherein

the biasing member is in contact with the flexible disc over an entire circumference, and forms a part of a fluid storage chamber.

2. The shock absorber according to claim 1 , wherein a surface of the biasing member in contact with the flexible disc is curved toward a side facing the flexible disc.

3. The shock absorber according to claim 1 , wherein the biasing member includes a conical part on an outer diameter side and a planar part which is more planar than the conical part on an inner diameter side.

4. The shock absorber according to claim 3 , wherein the hole portion of the biasing member is provided in the planar part.

5. 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;

a cap member covering one end surface side of the second damping force generation mechanism and at least a part of an outer circumferential surface side of the valve seat member;

a communication passage formed on one end surface side of the cap member to allow an inside and an outside of the cap member to communicate; and

a bendable flexible disc provided on one end surface side or another end surface side of the cap member, wherein

a plate-shaped biasing member attached to bias the flexible disc, having a hole portion formed as a flow path of the working fluid between an inner circumferential end portion and an outer circumferential end portion, and being inserted with the piston rod at the inner circumferential end portion is disposed between the cap member and the flexible disc, and wherein

the biasing member is in contact with the flexible disc over an entire circumference, and forms a part of a fluid storage chamber.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (29)