Metal bellows

Patent metadata

Field	Value
Publication number	US-10378649-B2
Application number	US-201515517496-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Nov 5, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

An impact on the tips of peaks of a metal bellows on contact is reduced, and deformation of the tips of the peaks even on contact is reduced to a minimum. In a free length state of a metal bellows 10 in an early stage of incorporation without extension and contraction, valleys each turn around in a U shape in cross section, peaks each turn around in an arc shape in cross section, the peaks are each provided in a position offset with respect to the center of a pitch between valleys adjacent to the peaks on both sides, and of bellies connected to the peaks on both sides, at least bellies located on the offset side are provided with a constriction protruding inward of the metal bellows.

First claim

The invention claimed is:

1. A metal bellows in an annular shape comprising a structure repeated axially in which a first valley, a first belly, a first peak, and a second belly, which constitute a first pleat, and a second valley, a third belly, a second peak, and a fourth belly, which constitute a second pleat, are integrally formed in series in this order,
in a free length state of the bellows in an early stage of incorporation without extension and contraction, the first and second valleys each turning around in a U shape in cross section, constituting U-shaped valleys, the first and second peaks each turning around in an arc shape in cross section, constituting arc-shaped peaks, each of the arc-shaped peaks being provided in a position offset in an axial direction of the metal bellows with respect to a center of a pitch which is a distance in the axial direction between the U-shaped valleys adjacent to each arc-shaped peak,
wherein each belly has a smooth arc shape in cross section and connects the U-shaped valley and the arc-shaped peak adjacent to the belly without undulation, wherein a boundary between the belly and the arc-shaped peak on the offset side of each pleat is formed by a constriction bent further inward of the pleat of the metal bellows than an offset-side part of the arc-shaped peak in the axial direction.

2. The metal bellows according to claim 1 , wherein the constriction is provided continuously or discontinuously with the peaks in the arc shape in cross section.

3. The metal bellows according to claim 1 , wherein the constriction has an arc shape in cross section, whose curvature radius R2 is set in a range of R2=1R1 to 5R1, where R1 is an arc-shaped curvature radius of the peaks.

4. The metal bellows according to claim 2 , wherein the constriction has an arc shape in cross section, whose curvature radius R2 is set in a range of R2=1R1 to 5R1, where R1 is an arc-shaped curvature radius of the peaks.

5. The metal bellows according to claim 1 , wherein the bellies opposite to the offset side each are constituted by an inside-diameter-side portion, with reference to an effective diameter of the metal bellows, having a bend with a small curvature radius, and an outside-diameter-side portion, with reference to the effective diameter of the metal bellows, having a bend with a curvature radius larger than the curvature radius of the inside-diameter-side portion.

6. The metal bellows according to claim 2 , wherein the bellies opposite to the offset side each are constituted by an inside-diameter-side portion, with reference to an effective diameter of the metal bellows, having a bend with a small curvature radius, and an outside-diameter-side portion, with reference to the effective diameter of the metal bellows, having a bend with a curvature radius larger than the curvature radius of the inside-diameter-side portion.

7. The metal bellows according to claim 3 , wherein the bellies opposite to the offset side each are constituted by an inside-diameter-side portion, with reference to an effective diameter of the metal bellows, having a bend with a small curvature radius, and an outside-diameter-side portion, with reference to the effective diameter of the metal bellows, having a bend with a curvature radius larger than the curvature radius of the inside-diameter-side portion.

8. The metal bellows according to claim 4 , wherein the bellies opposite to the offset side each are constituted by an inside-diameter-side portion, with reference to an effective diameter of the metal bellows, having a bend with a small curvature radius, and an outside-diameter-side portion, with reference to the effective diameter of the metal bellows, having a bend with a curvature radius larger than the curvature radius of the inside-diameter-side portion.

Assignees

• Eagle Ind Co Ltd

Inventors

• Sato Koji
• Miyake Kuniaki
• Arikawa Tatsuhiro

Classifications

• F16J3/047 Primary

  Metallic bellows · CPC title

• F16J15/52

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

• F16J3/04

  Bellows · CPC title