Shock absorber

Patent metadata

Field	Value
Publication number	US-9856939-B2
Application number	US-201514797900-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Jul 16, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A shock absorber includes a reservoir between a cylinder and an outer tube, in which hydraulic liquid and gas are sealed; a middle tube between the cylinder and the outer tube; a connecting pipe in the lateral wall of the middle tube, which includes a tip end extending toward the outside of the outer tube; an opening in the outer tube, allowing hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and a partition member in the reservoir, which includes a partition wall that configured to regulate hydraulic liquid's upward flow from the opening in the reservoir. The partition member is made of flexible resin or rubber, provided with a fitting hole, and fitted to the connecting pipe with interference with the connecting pipe inserted through the hole.

First claim

What is claimed is:

1. A shock absorber for being installed between two relatively displaceable members, the shock absorber comprising:
a cylinder in which a hydraulic fluid is sealed;
a piston inserted in the cylinder;
a piston rod interconnected to the piston and extending out of the cylinder;
an outer tube mounted over an outer circumferential surface of the cylinder;
a reservoir formed between the cylinder and the outer tube and in which the hydraulic liquid and gas are sealed;
a middle tube mounted between the cylinder and the outer tube;
a connecting pipe disposed in a lateral wall of the middle tube and including a tip end extending toward the outside of the outer tube;
an opening formed in the outer tube and allowing the hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and
a partition member placed within the reservoir, the partition member including a partition wall that, in a state that the shock absorber is located between the two relatively displaceable members, regulates an upward flow of the hydraulic liquid from the opening to an upper portion of the reservoir, wherein
the partition member is configured as a single integrated structure, the partition member comprising flexible resin or rubber, and
the partition member is provided with a fitting hole, and fitted, without using a fixing member, to the connecting pipe with interference, so that the connecting pipe is inserted through the fitting hole.

2. The shock absorber according to claim 1 , wherein the partition member is made of a single material.

3. The shock absorber according to claim 1 , wherein
the partition member is provided with a contact portion that is formed around the fitting hole and comes into contact with an outer circumferential surface of the middle tube, and
the partition member is formed so that a portion between the contact portion and the fitting hole is separated away from a proximal end of the connecting pipe.

4. The shock absorber according to claim 1 , wherein the partition member includes a thin-wall portion around the fitting hole.

5. The shock absorber according to claim 1 , wherein the partition member includes a core metal in the inside thereof.

6. A shock absorber for being installed between two relatively displaceable members, the shock absorber comprising:
a cylinder in which a hydraulic fluid is sealed;
a piston inserted in the cylinder;
a piston rod interconnected to the piston and extending out of the cylinder;
an outer tube mounted over an outer circumferential surface of the cylinder;
a reservoir formed between the cylinder and the outer tube and in which the hydraulic liquid and gas are sealed;
a middle tube mounted between the cylinder and the outer tube;
a connecting pipe disposed in a lateral wall of the middle tube and including a tip end extending toward the outside of the outer tube;
an opening formed in the outer tube for allowing the hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and
a partition member placed within the reservoir, the partition member including a partition wall that, in a state that the shock absorber is located between the two relatively displaceable members, regulates an upward flow of the hydraulic liquid from the opening to an upper portion of the reservoir, wherein
the partition member is configured as a single integrated structure, the partition member comprising flexible resin or rubber,
the partition member is provided with a fitting hole, and fitted to the connecting pipe with the connecting pipe inserted through the fitting hole, and
the partition member further includes the partition wall, a recess adjacent to the partition wall, and a surface adjacent to the recess on an opposite side from the partition wall with respect to the recess, each of which is located on an opposite side from the middle tube, the recess being recessed toward a middle tube-side with respect to an end of the surface closer to the recess.

7. The shock absorber according to claim 6 , wherein the partition member comprises a plurality of ribs formed integrally with the partition member, the plurality of ribs extending along an axis direction of the shock absorber.

8. The shock absorber according to claim 6 , wherein the partition member includes a core metal in the inside thereof.

9. A shock absorber for being installed between two relatively displaceable members, the shock absorber comprising:
a cylinder in which a hydraulic fluid is sealed;
a piston inserted in the cylinder;
a piston rod interconnected to the piston and extending out of the cylinder;
an outer tube mounted over an outer circumferential surface of the cylinder;
a reservoir formed between the cylinder and the outer tube and in which the hydraulic liquid and gas are sealed;
a middle tube mounted between the cylinder and the outer tube;
a connecting pipe disposed in a lateral wall of the middle tube and including a tip end extending toward the outside of the outer tube;
an opening formed in the outer tube and allowing the hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and
a partition member placed within the reservoir, the partition member including a partition wall that, in a state that the shock absorber is located between the two relatively displaceable members, regulates an upward flow of the hydraulic liquid from the opening to an upper portion of the reservoir, wherein
the partition member is configured as a single integrated structure, the partition member comprising flexible resin or rubber,
the partition member is provided with a fitting hole through which the connecting pipe is inserted, and
the fitting hole has a diameter smaller than an outer diameter of the connecting pipe with the connecting pipe out of the fitting hole.

10. The shock absorber according to claim 9 , wherein the partition member includes a core metal in the inside thereof.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Matsumoto Hiroyuki
• Katayama Shigeo
• Katayama Yohei
• Tanabe Umi
• Kimura Yusei
• Midorikawa Yoshie
• Hata Hideki
• Shioume Osamu

Classifications

• F16F9/3415 Primary

  characterised by comprising plastics, elastomeric or porous elements · CPC title

• F16F9/3257

  in twin-tube type devices · CPC title

• F16F9/18

  with a closed cylinder and a piston separating two or more working spaces therein · CPC title

• F16F9/325

  for attachment of valve units · CPC title