Cylinder device and cover member

Patent metadata

Field	Value
Publication number	US-10167919-B2
Application number	US-201515524260-A
Country	US
Kind code	B2
Filing date	Nov 4, 2015
Priority date	Nov 4, 2014
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A cylinder device includes a cylinder that has one end from which a piston rod extends, a pipe-shaped cover member that has an extendable bellows portion and a small-diameter portion whose inner diameter is smaller than an inner diameter of the bellows portion, the cover member being configured to protect the piston rod, and a capping member fitted into the cylinder, the capping member having a convex portion to which the small-diameter portion of the cover member is locked, at an outer periphery, wherein at the small-diameter portion of the cover member, a bulge portion that bulges outside in a radial direction is formed.

First claim

The invention claimed is:

1. A cylinder device, comprising:
a cylinder that has one end from which a piston rod extends;
a pipe-shaped cover member that has an extendable bellows portion and a small-diameter portion whose inner diameter is smaller than an inner diameter of the bellows portion, the cover member being configured to protect the piston rod; and
a capping member fitted into the cylinder, the capping member having a convex portion to which the small-diameter portion of the cover member is locked, at an outer periphery, wherein
at the small-diameter portion of the cover member, a bulge portion that bulges outside in a radial direction is formed, and
a rigidity at an open end side of the bulge portion is lower than a rigidity at a base end side of the bulge portion.

2. The cylinder device according to claim 1 , wherein
a circumferential length of the bulge portion at the open end side is longer than a circumferential length of the bulge portion at the base end side.

3. The cylinder device according to claim 1 , wherein
a bulge at the open end side of the bulge portion is larger than a bulge at the base end side of the bulge portion.

4. The cylinder device according to claim 1 , wherein
a plate thickness at the open end side of the bulge portion is thinner than a plate thickness at the base end side of the bulge portion.

5. The cylinder device according to claim 1 , wherein
a plurality of the convex portions of the capping member are disposed a circumferential direction.

6. The cylinder device according to claim 1 , wherein
the small-diameter portion is connected to the bellows portion at the base end side, and extends away from the bellows portion in an axial direction of the cylinder device from the base end side to the open end side.

7. The cylinder device according to claim 6 , wherein
the bulge portion has
two radial direction portions extending outwardly in the radial direction, and
a circumferential direction portion connecting the two radial direction portions with each other, and

a total length of the two radial direction portions and the circumferential direction portion of the bulge portion at the open end side is longer than at the base end side.

8. A cylinder device, comprising:
a cylinder that has one end from which a piston rod extends;
a pipe-shaped cover member that has an extendable bellows portion and a small-diameter portion whose inner diameter is smaller than an inner diameter of the bellows portion, the cover member being configured to protect the piston rod; and
a capping member fitted into the cylinder, the capping member having a convex portion to which the small-diameter portion of the cover member is locked, at an outer periphery, wherein
at the small-diameter portion of the cover member, a bulge portion that bulges outside in a radial direction is formed, and
a plate thickness of a radial direction portion of the bulge portion is thinner than a plate thickness of a circumferential direction portion of the bulge portion.

9. The cylinder device according to claim 8 , wherein
a circumferential length of the bulge portion at an open end side of the bulge portion is longer than a circumferential length of the bulge portion at a base end side of the bulge portion.

10. The cylinder device according to claim 8 , wherein
a bulge at an open end side of the bulge portion is larger than a bulge at a base end side of the bulge portion.

11. The cylinder device according to claim 8 , wherein
a plate thickness at an open end side of the bulge portion is thinner than a plate thickness at a base end side of the bulge portion.

12. The cylinder device according to claim 8 , wherein
a plurality of the convex portions of the capping member are disposed in a circumferential direction.

13. The cylinder device according to claim 8 , wherein
the bulge portion has a further radial direction portion,
the radial direction portion and the further radial direction portion of the bulge portion extend outwardly in the radial direction, and are connected with each other by the circumferential direction portion, and
the plate thickness of the radial direction portion and a plate thickness of the further radial direction portion are thinner than the plate thickness of the circumferential direction portion.

14. A cylinder device, comprising:
a cylinder that has one end from which a piston rod extends;
a pipe-shaped cover member that has an extendable bellows portion and a small-diameter portion whose inner diameter is smaller than an inner diameter of the bellows portion, the cover member being configured to protect the piston rod; and
a capping member fitted into the cylinder, the capping member having a convex portion to which the small-diameter portion of the cover member is locked, at an outer periphery, wherein
at the small-diameter portion of the cover member, a bulge portion that bulges outside in a radial direction is formed, and
at an end portion at a base end side of the small-diameter portion of the cover member, a flat portion that extends outside in the radial direction in a flanged shape is disposed, the flat portion being locked to the convex portion of the capping member.

15. The cylinder device according to claim 14 , wherein
a circumferential length of the bulge portion at an open end side of the bulge portion is longer than a circumferential length of the bulge portion at a base end side of the bulge portion.

16. The cylinder device according to claim 14 , wherein
a bulge at an open end side of the bulge portion is larger than a bulge at a base end side of the bulge portion.

17. The cylinder device according to claim 14 , wherein
a plate thickness at an open end side of the bulge portion is thinner than a plate thickness at a base end side of the bulge portion.

18. The cylinder device according to claim 14 , wherein
a plurality of the convex portions of the capping member are disposed in a circumferential direction.

Assignees

• Kyb Corp
• Honda Motor Co Ltd

Inventors

• Miwa Masahiro
• Ando Kazuma
• Sutou Shinichi
• Ohta Yasutaka
• Takami Koji

Classifications

• F16F9/38 Primary

  Covers for protection or appearance · CPC title

• F16J15/52

  by means of sealing bellows or diaphragms (connection of valves to inflatable elastic bodies B60C29/00) · CPC title

• B60G2204/1242

  on a damper, e.g. MacPerson strut · CPC title

• F16F2230/105

  Flexible, e.g. bellows or bladder · CPC title

• B60G15/07

  the damper being connected to the stub axle and the spring being arranged around the damper {(B60G15/068 takes precedence)} · CPC title