JPH05248572A - Jointing structure in tube fitting for hose and metal tube - Google Patents

Abstract

PURPOSE:To eliminate a heating and brazing process for improving processability, and restrain the deterioration of mechanical strength by pressing the side df a piping toward a jointing direction for connecting the piping via engagement with a sleeve member through the caulking effect thereof near the periphery of a pipe wall end at a stepped port section. CONSTITUTION:In a tube fitting body 1 where a circulation port 2 is formed along an axial center, and a cylindrical wall 3 for connection to a hose is formed at one end, with a stepped port 5 having an expanded bore at the other end, the end of a metal pipe P with an external collar wall P' is coupled to the stepped port 5 via an elastic seal ring 7 laid at the side of the edge and a sleeve member 6 laid externally. When the sleeve member 6 is pressed toward a joint direction at the time of coupling, the pipe P is firmly jointed to the fitting body 1 due to a caulking engagement structure at a position 4' near the periphery of the joint cylindrical wall 4 with the stepped port 5, as the rear side peripheral wall has a recessed groove 7 and an externally projected collar wall 8 at the rear end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a rubber hose having a thickness of about 20 m / m or less, which is often used in automobiles, various machines, equipments, etc., as a supply passage for oil supply and air supply.
Alternatively, the present invention relates to an improvement in the connection structure of a connection joint that connects a resin hose and a metal pipe having a relatively small diameter of about 20 m / m or less to each other.

[0002]

2. Description of the Related Art Conventionally, as a connection structure of this type, as shown in FIG. 3, for example, a through hole (12) is formed through a shaft core, and one end of the through hole (13) is connected to a hose. And at the stepped port (15) of the connecting cylinder wall of the joint body (11) with the other end side being the expanded connecting cylinder wall (14), the end portion (P ₁ ) of the metal pipe (P ₁ ) ') Was connected by brazing (W).

[0003]

However, in such a conventional connecting structure, there is an extreme difference in wall thickness between the connecting cylinder wall (14) and the pipe (P ₁ ) on the brazing weld side. If there is, mechanical strength due to brittleness due to local overheating near the brazing (W) part on the piping (P ₁ ) side due to unfamiliarity and immaturity in the process of brazing by heating with a burner etc. This caused deterioration of the pipe (P ₁ ) and unevenness in the product bending shape of the pipe (P ₁ ) and cracking and breakage due to the disposition of the pipe (P ₁ ) under vibrating conditions due to excessive mounting at the time of failure. Further, after brazing and welding, the entire product is required to be coated with a corrosion-resistant coating by plating, etc., which makes the handling troublesome and significantly reduces the processability, and makes it difficult to form a coating of uniform and stable quality. There was a problem such as doing.

The present invention solves the above-mentioned conventional problems very effectively and eliminates the need for any connecting means by heating and brazing. Therefore, cracks and breakage on the pipe side due to deterioration of the mechanical strength are required. Proposal of a connection structure that eliminates the anxiety of the above and further enables the use of a joint body and piping that have been subjected to a corrosion-resistant coating treatment by plating in advance, and is capable of improving the processability and providing a stable quality coating formation. The purpose is.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a step in which a through hole is formed in a shaft core portion, one end side of which is a cylinder wall connected to a hose, and the inside of the other end side is expanded. An external annular flange wall portion formed at an end portion on the pipe side is provided at the stepped opening portion of the joint main body which is a connecting cylindrical wall with the metal pipe as an attachment port, and an elastic seal ring is provided to the flange wall portion. A hose and a metal pipe which are connected to each other by a sleeve member which is inserted from the back to the pipe side through an interposing member and is pressed in the connecting direction by a hooking structure to the sleeve member near the end circumference of the connecting cylinder wall. The gist is the connecting structure of the connecting joint.

[0006]

Since the present invention is constructed as described above, the sleeve is provided with the elastic seal ring interposed by inserting the pipe side into the stepped mouth portion with the annular flange wall portion formed at the pipe end portion. A member is pressed in the connecting direction, and the end peripheral portion of the connecting cylinder wall is then connected to the sleeve member by a structure that is supported by caulking, so that heating brazing and welding are not required at all and connection is simple. Can be done.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway sectional view of a connecting structure in a connection joint between a hose and a metal pipe of the present invention, and FIG. It is a view equivalent to FIG. 1 of the same as the example, but (1) is a through hole (2) in the shaft core part.
To connect with a rubber hose or a resin hose at one end to form a cylindrical wall (3), and at the other end to connect to a metal pipe (P) as a stepped port (5) with an expanded inner diameter. A joint body having a cylindrical wall (4). And pipe at step (5)
With the elastic seal ring (7) between the outward ring-shaped collar wall (P ') formed at the end on the (P) side, pipe from behind.
It is pressed in the connecting direction by the sleeve member (6) incorporated on the (P) side, and is connected by a hooking structure to the sleeve member by caulking near the end circumference (4 ') of the connecting cylindrical wall (4). To do.

In the embodiment of FIG. 1, the sleeve member
(6) Since the annular groove (7) is provided on the rear side peripheral wall and the flange wall (8) protruding outward is provided on the rear end, the sleeve member is provided with the stepped opening (5) with the optimum pressing force. Since the caulking near the end circumference (4 ') is also performed in the groove (7), it is possible to prevent the external surface of the pipe (P) from being scratched due to excessive caulking.

[0009]

As described above, the connecting structure according to the present invention presses the pipe (P) side in the connecting direction so that the connecting cylindrical wall (4) formed by the sleeve member (6) at the stepped port (5). ) Since it is connected by a hooking structure to the sleeve member by caulking at the end circumference (4 '), the connection near the connection due to deterioration of the mechanical strength due to the need for no connecting means by heating and brazing. The risk of cracks and breakage on the pipe (P) side can be eliminated, and the joint body (1) and the pipe (P) that have been subjected to a corrosion-resistant coating treatment by plating in advance can be used to improve processability. It is a connection structure in a connection joint with a hose and a metal pipe which is extremely useful and can be constructed with a film formation of a stable quality while being remarkably improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a connecting structure in a hose and a connection joint with a metal pipe showing an embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 of the same as another embodiment.

FIG. 3 is a partially cutaway sectional view of a conventional example.

[Explanation of symbols]

 1 joint body 2 flow hole 3 continuous cylinder wall 4 continuous cylinder wall 4'close to the end 5 step landing 6 sleeve member 7 elastic seal ring P pipe P 'collar wall

Claims (3)

[Claims] 1. A stepped port having a through hole (2) penetrating the shaft core, one end side of which is a cylinder wall (3) connected to a hose, and the inside of the other end side of which is expanded. (5) As the connecting cylinder wall (4) with the metal pipe (P), at the stepped opening of the joint body (1), the outward annular collar wall formed at the end on the pipe (P) side (P ') part,
An end of the connecting cylinder wall (4) is pressed in the connecting direction by a sleeve member (6) which is installed on the pipe (P) side from behind the elastic seal ring (7) with respect to the flange wall. Around Zhou (4 ')
A connecting structure in a connecting joint with a hose and a metal pipe, characterized in that the structure is connected by a hanging structure for the sleeve member. 2. The elastic seal ring (7) is attached to an annular collar wall (P
') Part and the end face of the sleeve member (6) are installed and pressed, and the sleeve member (6) is attached to the end circumference (4') of the connecting cylinder wall (4).
The connection structure according to claim 1, wherein the connection structure is crimped and supported on the outer periphery of the. 3. A stepped mouth of the elastic seal ring (7)
It is installed between the enlarged diameter part of (5) and the annular collar wall (P '), pressed by the sleeve member (6), and the other end surface of the sleeve member (6) is close to the end circumference of the connecting cylinder wall (4). The connecting structure according to claim 1, wherein the (4 ') is supported by crimping.