JPH10141555A - Connecting structure for thin wall and small diameter metal pipe with pressure rubber hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a connection part to sufficiently withstand high pressure with a relatively thin-wall structure to make the whole of the connecting structure lightweight by forming the connection part on the metal pipe side extremely simply, eliminating the need for nipple members and their brazing operation to improve the productivity, and at the same time, enhancing the rigidity of the connection part by working and hardening associated with the forming of comb-teeth faces by means of rolling or press working. SOLUTION: The part adjacent to a connection end of a metal pipe P, which is formed into a double wall P" by fitting-on an outer pipe P' in fit manner or in press-fit manner, is provided with a comb-teeth face 2 over the double wall part to form a connection part 1. In a state where the connection part is covered with a pressure-rubber hose P1 , the connection part 1 is caulked and fixed 4 by a bottomed cylindrical socket member 3 in which a bottom wall part 3' hedges the outer pipe P', and at least one of the end face parts of the outer pipe P' fitted on the metal pipe P in fit manner or in press-fit manner, and the metal pipe P are structured to be sealed together 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a metal pipe having a relatively thin and small diameter of about 20 m / m or less, which is provided as a supply path for lubrication and air supply to an automobile or various machines and devices. And a connection structure with a pressure-resistant rubber hose whose outer side is braided with a thin metal wire.

[0002]

Conventionally, the use of, as shown generally in FIG. 13 as a connection structure of this kind, the metal tube row welded (W) to the ends of the (P ₁₁₎ the nipple member (11), said nipple member A cylindrical shape in which a pressure-resistant rubber hose (12) is inserted into a saw-toothed wall portion (11 ') formed by cutting provided near a connection end portion on the distal end side, and the rear end portion is hung on a nipple member (11). The connection was made by caulking (14) with the socket member (13). (12 ')
Is a braided braid made of a thin metal wire outside the pressure-resistant rubber hose (12).

[0003]

However, in such a conventional technique, use of a separate nipple member (11) by cutting a thick-walled material and low welding at the end of the metal pipe (P ₁₁ ) are required. W) causes inconvenience in such processing and work, resulting in a remarkable decrease in productivity, and also causes unreliable leakage at the low welded portion, and at the same time, deterioration of mechanical properties due to overheating. Due to the combination of the metal pipe (P
₁₁ ) There were problems such as cracks and breakage on the side.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has an extremely simple formation of a connecting portion on the metal tube side, thereby eliminating the need for a nipple member and a low welding operation thereof, thereby improving productivity. By improving the rigidity at the connecting portion by work hardening related to the formation of the comb tooth surface by rolling or pressing, the connecting portion is sufficiently treated with a relatively thin structure, and the entire connecting structure portion is improved. It is an object of the present invention to provide a connection structure between a thin, thin metal tube and a pressure-resistant rubber hose that can be made lightweight.

[0005]

According to the present invention, in order to achieve the above object, the outer tube is fitted or press-fitted into a double-walled metal tube near the connection end. A bottomed cylindrical socket member in which a bottom wall portion is supported on the outer tube side in a state where a comb tooth surface is provided over a double wall portion to form a connection portion, and a pressure-resistant rubber hose is attached to the connection portion. And at least one of the end surfaces of the outer tube inserted into the metal tube in a fitting or press-fitting manner and the metal tube are sealed with each other. And a connection structure between a thin-walled thin metal tube and a pressure-resistant rubber hose. The seal is at least one selected from welding, an adhesive, or a sealant, or the comb tooth surface is formed. , Formed by an annular bulging wall or a sawtooth wall with a spacing, The inner tube is further press-fitted into the inside of the metal tube, the metal tube and the outer tube are made of different materials, or have different thicknesses, or at least a part of the comb tooth surface (2). Are formed by angular concave portions and / or convex portions, or the annular groove (5) for supporting the bottom wall portion (3 ') of the socket member (3) is formed by an angular concave portion. is there.

According to the present invention, the connecting portion on the side of the metal tube is rolled or pressed by the double wall at the connecting portion and the comb-teeth surface extending over the double wall portion. Can be easily formed, and the productivity can be remarkably improved by eliminating these processing inconveniences. At the same time, the rigidity at the connecting portion is increased by the work hardening associated with the formation of the comb tooth surface by the processing. Thus, the connecting portion can be sufficiently coped with a relatively thin structure so that the entire connecting structure can be made lightweight.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged sectional view of a connection structure between a thin and small-diameter metal tube and a pressure-resistant rubber hose according to the present invention, which is partially cut away. FIG. 2 is a view corresponding to FIG. 1 of another embodiment, FIG. 3 is an enlarged cross-sectional view of a connection structure according to still another embodiment, and FIG. 4 is a view corresponding to FIG. 3 of still another embodiment. Is a diagram corresponding to FIG. 3 of another embodiment, FIG. 6 is a diagram corresponding to FIG. 3 of still another embodiment,
7 is a view corresponding to FIG. 1 of still another embodiment, FIG. 8 is a view corresponding to FIG. 1 of still another embodiment, and FIG. 9 is FIG. 3 of still another embodiment.
FIG. 10 is a diagram corresponding to FIG. 3, and FIG.
1 is a view corresponding to FIG. 3 of still another embodiment, and FIG. 12 is a view corresponding to FIG. 3 of still another embodiment, wherein (1) is a connecting portion near a connecting end on the metal pipe (P) side. The outer tube (P ') is inserted in a fitting shape or a press-fitting shape to form a double wall (P "), and the outer wall (P') is rolled or pressed from the outside in the circumferential direction over the double wall portion. The comb tooth surfaces (2) are formed by plastic working such as processing, and these comb tooth surfaces (2) are annular bulges which are spaced only by the outer tube (P ') as shown in FIG. A wall is formed, or a comb-shaped surface (2) is formed by an annular bulged wall or a saw-tooth wall having a space between the metal tube (P) and the outer tube (P ') as shown in FIGS. May be.

The outer tube (P ') does not have to be located at the same position as the end of the metal tube (P) and its end face, but at least the bottom wall (3') of the socket member (3) described later. The position must be a double wall (P ″).

Further, the outer pipe (P ') is connected to the metal pipe (P).
Before the formation of the comb tooth surface (2) after the press-fitting, the metal pipe (P) and one or both of the end faces of the outer pipe (P ') or the entire inner peripheral face of the outer pipe are mutually connected in advance. Beam welding, TIG
Sealing (6) by welding, MIG welding, plasma welding, spot welding, resistance welding or laser welding, alone or in combination with an adhesive or a sealant, etc., between the metal pipe (P) and the outer pipe (P ') Metal pipe (P) or connecting part (1) in order to prevent leakage of fluid flowing inside from inside and to facilitate insertion of pressure-resistant rubber hose (P ₁ ) described later.
May be formed into a tapered shape by a punch.

Then, a pressure-resistant rubber hose (P ₁ ) covered with a braid (7), preferably braided with a thin metal wire, is inserted into the connecting portion (1), and in this state, the bottom wall (3 ′) is attached. An annular groove (5) on the outer tube (P ') side
The bottomed cylindrical socket member (3) supported on the portion is caulked from the outer side in the circumferential direction to fix (4) the connecting portions of the socket members, thereby connecting the socket members.

The material of the metal tube (P) and the outer tube (P ') are generally both iron-based metals, but can be appropriately selected. In order to ensure the sealing property between the pressure-resistant rubber hose (P ₁ ) and the bottom wall (3 ′) of the socket member (3), for example, the metal pipe (P) is made of an iron-based metal and the outer pipe (P ′) A metal softer than the metal tube (P), for example, copper,
It is preferable to use a metal such as aluminum. With such a configuration, the bottom wall portion (3 ') is supported by the annular groove (5) on the outer tube (P') side so as to extend outward in the circumferential direction. In the case of further crimping, the bottom wall (3 ') fits into the outer tube (P') and is pressed into contact with the outer tube (P '), so that a secure fixation can be obtained.

Further, a bottom wall portion (3 ') of the socket member (3).
The concave portion of the annular groove (5) for supporting the groove is formed in an angular shape to increase the connection strength, or the concave portion having one or more of the comb tooth surfaces (2) without the large radius of curvature and And / or pressure-resistant rubber hose (P ₁ )
In order to increase the holding force on the metal pipe (P)
Is preferably made of a soft metal such as copper or aluminum, and the outer tube (P ') is preferably made of an iron-based metal harder than the metal tube. With this configuration, a comb tooth surface is formed by rolling or pressing. In this case, the comb tooth surface (2) is easily processed, and the outer tube (P ') is not broken.

FIGS. 7 to 11 show embodiments which disclose these.
In FIG. 7, the concave portion of the annular groove (5) supporting the bottom wall (3 ') of the socket member (3) is formed in an angular shape to increase the connection strength. Next, in FIG. 8, an annular groove (3'a) having a quadrangular cross section is formed on the inner peripheral surface of the bottom wall (3 ') of the socket member (3), and the comb formed on the angular groove is formed on the annular groove. One of the tooth surfaces (2) is fitted and supported. FIG. 9 shows a plurality of (three in the drawing) concave portions of the comb tooth surface (2) formed in an angular shape to increase the holding force on the pressure-resistant rubber hose (P ₁ ). (6 ') is a seal provided by seam welding provided at the groove bottom of the comb tooth surface (2). 10 and 11 show an annular groove (5) for supporting the bottom wall (3 ') of the socket member (3).
Are formed in an angular shape, and a plurality of (three in the drawing) convex portions (FIG. 10) of the comb tooth surface (2) or a convex portion (FIG. 11) of the saw tooth wall are formed. It is formed in a square shape to increase the holding force on the pressure-resistant rubber hose (P ₁ ). Further, if desired, as shown in FIG. 12, it is possible to press-fit the inner pipe (P "") inside the metal pipe (P) to make the connecting portion a triple wall or more.

1, 3, 6, and 7 as desired.
As shown in FIG. 9 and FIG. 9, the connecting portion (1) formed by the metal pipe (P) is kept at its original diameter, or FIG. 2, FIG. 4, FIG. 5, FIG. 8, FIG. As shown in (1), the diameter may be slightly increased by a punch. In any case, a constant flow path can be secured without causing a flow resistance in the metal pipe (P).

[0015]

As described above, the connection structure between the thin thin metal tube and the pressure-resistant rubber hose according to the present invention extends over the double wall (P ″) formed by the connecting portion (1) and over the double wall portion. Due to the structure of the comb tooth surface (2), the connecting portion (1) can be easily formed by rolling or pressing, and the productivity can be remarkably improved by eliminating such troublesome work. At the same time, the rigidity at the connecting portion (1) can be increased by the work hardening associated with the formation of the comb tooth surface (2) by the working, so that the connecting portion can be sufficiently coped with a relatively thin structure. This is an extremely useful connection structure between a thin-walled thin metal tube and a pressure-resistant rubber hose, such as making the entire connection structure lightweight.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a connection structure between a thin thin metal tube and a pressure-resistant rubber hose according to the present invention, which is partially cut away.

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

FIG. 3 is an enlarged sectional view of a connection structure according to a half of another embodiment.

FIG. 4 is a diagram corresponding to FIG. 3 of still another embodiment.

FIG. 5 is a diagram corresponding to FIG. 3 of another embodiment.

FIG. 6 is a diagram corresponding to FIG. 3 of still another embodiment.

FIG. 7 is a view corresponding to FIG. 1 of still another embodiment.

FIG. 8 is a view corresponding to FIG. 1 of still another embodiment.

FIG. 9 is a diagram corresponding to FIG. 3 of still another embodiment.

FIG. 10 is a view corresponding to FIG. 3 of still another embodiment.

FIG. 11 is a view corresponding to FIG. 3 of still another embodiment.

FIG. 12 is a view corresponding to FIG. 3 of still another embodiment.

FIG. 13 is a partially cutaway sectional view of a connection structure showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Connecting part 2 Comb tooth surface 3 Socket member 3 'Bottom wall part 4 Fixing by caulking 5 Ring groove 6, 6' Seal 7 Blade P Metal tube P 'Outer tube P "Double wall P ₁ Pressure-resistant rubber hose P"' Inner tube

Claims (6)

[Claims] 1. A metal pipe (P) having a double wall (P ″) formed by inserting an outer pipe (P ′) in a fitting or press fitting shape, and near the connection end of the metal pipe (P ″). connecting portion comb tooth surface (2) provided over the unit (1) ungated, with the state of deposited a pressure hose (P ₁₎ to the connecting portion, the outer tube bottom wall portion (3 ') ( The connecting part (1) is caulked and fixed (4) with a bottomed cylindrical socket member (3) supported on the P ') side, and is fitted or pressed into the metal pipe (P). A connection between a thin and small-diameter metal tube and a pressure-resistant rubber hose, wherein at least one of the end faces of the inserted outer tube (P ') and the metal tube (P) are mutually sealed (6). Construction. 2. The connection structure according to claim 1, wherein the seal is at least one selected from welding, an adhesive, and a sealant. 3. The thin and small-diameter metal tube according to claim 1, wherein the comb tooth surface is formed by an annular bulging wall or a saw tooth wall which keeps an interval. Connection structure with rubber hose. 4. The thin and small-diameter metal tube according to claim 1, wherein an inner tube (P ″ ′) is further press-fitted inside the metal tube (P). And connection structure with pressure-resistant rubber hose. 5. The metal pipe (P) and the outer pipe (P ′) are made of different materials or have different wall thicknesses. Connection structure between thin thin metal tube and pressure-resistant rubber hose. 6. A ring for forming at least a part of the comb tooth surface (2) with angular concave and / or convex portions or for supporting a bottom wall (3 ') of the socket member (3). The connection structure between a thin-walled thin metal tube and a pressure-resistant rubber hose according to any one of claims 1 to 5, wherein the groove (5) is formed by an angular recess.