# US 2008/0302467 A1 · Pressure Resistant Vibration Absorbing Hose

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- Number: US 2008/0302467 A1
- Document ID: US20080302467A1
- Status: Published application
- Kind: A1
- Application number: 12/171,742
- Filed: 2008-07-11
- Published: 2008-12-11
- Earliest claimed: 2004-07-08
- Assignees: Denso Corporation; Tokai Rubber Industries, Ltd.
- Inventors: Hajime Mukawa; Keiichi Kitamura; Tetsuya Arima; Norihiko Furuta; Ayumu Ikemoto
- Web page: https://patentgrep.com/patent/US20080302467A1

## CPC

- F16L 11/085: {comprising one or more braided layers (in combination with layers of a helically wound core or wire F16L11/088)}
- F16L 11/26: made of sound-absorbing materials or with sound-absorbing structure
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A pressure resistant vibration absorbing hose has a hose body including an inner surface rubber layer, a reinforcing layer and an outer surface rubber layer and a joint fitting including a rigid insert pipe and a socket fitting. The joint fitting is attached to a swaged portion of an axial end portion of the hose body by securely swaging the socket fitting thereto. The inner surface rubber layer is formed by molding such that a swaged portion thereof is larger than a main portion thereof in diameter and a wall thickness of the swaged portion is equal to or larger than a wall thickness of the main portion, and after that, the reinforcing layer and the outer surface rubber layer are laminated to construct the hose body.

## Claims

### Claim at position 1

1-12. (canceled)

### Claim 13

A method of making a pressure-resistant vibration-absorbing hose, the method, comprising the steps of:
forming an elongated inner surface layer that has a swaged portion and a main portion, the swaged portion having a larger inner diameter than the main portion, the main portion having a wall thickness (t1) and the swaged portion having a wall thickness (t2), wherein t2 is greater than or equal to t1;
braiding or spirally winding a reinforcing wire member on the outer surface of the inner surface layer to form a reinforcing layer thereon and so as to follow the shape of the outer surface of the inner surface layer;
covering the outer surface of the reinforcing layer to form a cover layer thereon and so as to follow the shape of the reinforcing layer; and
affixing a joint fitting having a rigid insert pipe and a socket fitting to the swaged portion by securely swaging the socket fitting to the cover layer in a diametrically contracting direction while the insert pipe is inserted into the swaged portion and the socket fitting is fitted on the outer surface of the cover layer.

### Claim 14 (depends on 13)

The method as set forth in claim 13, wherein the wall thickness t2 at the swaged portion is equal to the wall thickness t1 at the main portion.

### Claim 15 (depends on 13)

The method as set forth in claim 13, wherein the wall thickness t2 at the swaged portion is larger than the wall thickness t1 at the main portion.

### Claim 16 (depends on 15)

The method as set forth in claim 15, wherein the wall thickness t2 at the swaged portion is equal to or larger than 1.3 times the wall thickness t1 at the main portion.

### Claim 17 (depends on 13)

The method as set forth in claim 13, wherein an inner diameter of the insert pipe is designed equal to or generally equal to an inner diameter of the inner surface layer at the main portion.

### Claim 18 (depends on 13)

The method as set forth in claim 13, wherein an inner diameter of the inner surface layer at the swaged portion is equal to or larger than 1.3 times an inner diameter thereof at the main portion.

### Claim 19 (depends on 13)

The method as set forth in claim 13, wherein a wall thickness of the cover layer at the swaged portion is smaller than a wall thickness thereof at the main portion.

### Claim 20 (depends on 13)

The method as set forth in claim 13, wherein an outer diameter of the swaged portion of the cover layer is larger than an outer diameter of the main portion thereof.

### Claim 21 (depends on 13)

The method as set forth in claim 13, wherein the inner surface layer includes a tapered portion between the swaged portion and the main portion and the tapered portion diametrically contracts toward the main portion.

### Claim 22 (depends on 13)

The method as set forth in claim 13, wherein the cover layer is formed from a heat shrinkable tube.

### Claim 23 (depends on 13)

The method as set forth in claim 13, wherein a bursting pressure of the pressure resistant vibration absorbing hose under pressure is 1 MPa or more.

### Claim 24 (depends on 13)

The method as set forth in claim 13, wherein the reinforcing layer is formed by braiding or spirally winding the reinforcing wire member with braid or winding density of 50% or more.