IP Library › Granted Patent US 12669136
Granted Patent B2
US 12669136 · App. 18/843,285 · Granted Jun 30, 2026

Fluid pressure actuator

Inventors: Shingo Oono (Tokyo, JP); Shungo Fujita (Tokyo, JP)
Assignee: BRIDGESTONE CORPORATION
F15B15/103F16L57/00
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Quick Facts
Patent No.
US 12669136
App. No.
18/843,285
Granted
Jun 30, 2026
Kind
B2
Abstract

Provided is a fluid pressure actuator in which a bamboo shoot part is formed on a free end side of the sealing member to enable engaging and retaining a cover member that is separate from the fluid pressure actuator.

Claims (14)

1 . A fluid pressure actuator comprising a cylindrical tube that expands and contracts by fluid pressure, a sleeve that is an elastic structure made of woven fiber cords oriented in a predetermined direction and covers an outer circumference of the tube, and a sealing member that seals an end portion in an axial direction of the tube, wherein

a bamboo shoot part is formed on a free end side of the sealing member to enable engaging and retaining a cover member that is separate from the fluid pressure actuator,

the bamboo shoot part being a plurality of stages of an engagement structure in which a plurality of truncated square pyramids, each having an external shape in which a small-diameter portion and a large-diameter portion are connected by a tapered surface, are successively formed along the axial direction of the fluid pressure actuator,

the cover member having an insertion hole, and

the plurality of stages of the engagement structure being configured to engage with the insertion hole so that the cover member is less likely to disengage in the axial direction.

2 . The fluid pressure actuator according to claim 1 , wherein the bamboo shoot part is noncircular in cross section.

3 . The fluid pressure actuator according to claim 2 , wherein the bamboo shoot part is rectangular in cross section.

4 . The fluid pressure actuator according to claim 2 , wherein the bamboo shoot part is arranged in a direction where a long axis in the cross section is perpendicular to a bending direction of the fluid pressure actuator.

5 . The fluid pressure actuator according to claim 1 , wherein the sealing member is made of metal.

6 . The fluid pressure actuator according to claim 3 , wherein the bamboo shoot part is arranged in a direction where a long axis in the cross section is perpendicular to a bending direction of the fluid pressure actuator.

7 . The fluid pressure actuator according to claim 2 , wherein the sealing member is made of metal.

8 . The fluid pressure actuator according to claim 3 , wherein the sealing member is made of metal.

9 . The fluid pressure actuator according to claim 4 , wherein the sealing member is made of metal.

10 . The fluid pressure actuator according to claim 6 , wherein the sealing member is made of metal.