JOINT STRUCTURE OF STEEL PIPE AND LIGHT METAL PIPE

• US 20080136176A1
• Filed: 10/19/2006
• Published: 06/12/2008
• Est. Priority Date: 10/19/2006
• Status: Active Grant

• Current Assignee: Nichirin Co., Ltd.
• Original Assignee: Nichirin Co., Ltd.
• Inventors: Yagi, Takashi, Katayama, Toshiyuki, Matsui, Masamichi, Nakano, Yoshio
• Granted Patent: US 8,020,897 B2
• Time in Patent Office: Days
• US Class Current: 285/256
• CPC Class Codes: F16L 13/142 with a sealing element inserted into the female part before crimping or rolling
• CPC Class Codes: F16L 33/2073 directly connected to the rigid member
• CPC Class Codes: F16L 33/2076 by plastic deformation
• CPC Class Codes: Y10S 285/915 Mastic

Abstract

A joint structure of a steel pipe and a light metal pipe includes a socket; and a thermosetting resin, the steel pipe including a first joining end having a flat portion of the outer surface of the first joining end adjacent to the base, and an uneven portion of the outer surface of the first joining end adjacent to the front end, the socket covering the first joining end, the light metal pipe including a second joining end, the second joining end being interposed between the socket and the first joining end, the first joining end being joined to the second joining end by crimping while the thermosetting resin is present in the gap between the inner surface of the socket and the outer surface of the second joining end and between the outer surface of the first joining end and the inner surface of the second joining end.

Claims

1. A joint structure of a steel pipe and a light metal pipe, comprising:

a socket; and

a thermosetting resin,

the steel pipe including a first joining end having

a flat portion of the outer surface of the first joining end adjacent to the base of the steel pipe, and

an uneven portion of the outer surface of the first joining end adjacent to the front end of the steel pipe,

the socket covering the first joining end,

the light metal pipe including a second joining end,

the second joining end being interposed between the socket and the first joining end,

the first joining end being joined to the second joining end by crimping while the thermosetting resin is present in the gap between the inner surface of the socket and the outer surface of the second joining end and in the gap between the outer surface of the first joining end and the inner surface of the second joining end.

2. The joint structure according to claim 1, wherein the thermosetting resin has a glass transition temperature of 140°

C. or higher.

3. The joint structure according to claim 1, wherein the thermosetting resin is present in the gap between the inner surface of the socket and the outer surface of the second joining end and in the gap between the flat portion and the inner surface of the second joining end.

4. The joint structure according to claim 1, wherein the thermosetting resin is an epoxy resin.

5. The joint structure according to claim 1, wherein the steel pipe is a stainless-steel pipe, and the light metal pipe is an aluminum pipe.

6. The joint structure according to claim 1, wherein the first joining end is joined to the second joining end by crimping at three positions along the first and second joining ends in the longitudinal direction.