JP2003314772A - Coupling for connecting metal pipe with rubber hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling for connecting a metal pipe having relatively small diameter and thickness to a pressure resistant rubber hose, enabling well concentrical connection by a conical face and a corresponding conical face, and the connection requiring no high technology or much labor. <P>SOLUTION: The coupling comprises the metal pipe 20 and a sectionally U-shaped cylindrical socket 23 having an insertion hole 25 for the metal pipe. An outer end face 35 of an end wall 24 of the cylindrical socket is formed as an abutment portion of a spool 36 of the metal pipe and the inner face of the insertion hole 25 of the cylindrical socket 23 is formed as a conical face 27 having a larger diameter at an inner end face side 26. Part of a corresponding taper 28 corresponding to the insertion hole 25 is formed on the outer periphery of the metal pipe. A rubber hose 21 is mounted on the outer periphery of a connection portion 30 of the metal pipe and caulked and fixed by a cylindrical caulking portion 41 provided on the outer periphery of a mounting chamber. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal hose and a rubber hose for connecting a pressure-resistant rubber hose with a metal tube having a relatively small diameter and a thin wall which is used as a supply path for supplying oil, air, etc. to automobiles and various mechanical devices. It relates to a joint tool with.

[0002]

2. Description of the Related Art A joint between a metal tube and a rubber hose for connecting a relatively thin and thin metal tube and a pressure resistant rubber hose, which have been conventionally used as a supply path for oil supply, air supply, etc., to automobiles and various mechanical devices. As shown in FIG. 7, the metal tube (1)
And an insertion opening (2) through which the metal tube (1) is inserted, is provided in the end wall (3), and the rubber hose is faced to the insertion opening (2).
A cylindrical socket (6) made of metal and having a U-shaped cross section, which forms the mounting chamber (5) of (4), is used. The metal tube (1) has a cylindrical socket (6) made of metal.
Place spools (7) and (8) on both sides of the end wall (3) of
By forming a straight pipe part (11) with the same diameter between the two spools (7) and (8) and disposing it in the insertion port (2), the cylindrical socket (6) and the metal pipe (1) are integrated. It is fixed to. Then, by connecting the rubber hose (4) to the connecting portion (9) of the metal pipe (1) and crimping the cylindrical caulking portion (10) of the cylindrical socket (6), the metal pipe (1) and The rubber hose (4) is connected and fixed.

[0003]

However, the above-described conventionally known metal pipe (1) and the cylindrical socket (6) have the structure in which the two spools (7) and (8) formed in the metal pipe (1) are disposed between the two spools (7) and (8). Is formed in a straight pipe portion (11) having the same diameter, and the spools (7) and (8) are arranged on both surfaces of the end wall (3) of the cylindrical socket (6). It is preferable to connect the metal pipe (1) to the center of the cylindrical socket (6), but when the two pipes (7) and (8) are formed into a straight pipe portion (11) having the same diameter. If the spool (8) arranged on the inner end surface side of the cylindrical socket (6) is not concentric with the metal tube (1) and is formed into a perfect circle, the metal tube (1)
It becomes difficult to connect the cylindrical socket (6) to the coaxial center. However, forming the spool 8 concentrically and in a perfect circle requires a high level of skill and a lot of trouble.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and only by forming a conical surface on a metal tube, it is possible to securely connect the metal tube to the cylindrical socket without dropping out. The aim is to enable a reliable connection at the center of a cylindrical socket of a metal tube without requiring high technology and a lot of trouble.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a metal tube and an insertion hole through which the metal tube is inserted in an end wall, and a rubber hose mounting chamber facing the insertion hole. And a cylindrical socket made of metal and having a U-shaped cross section, and the outer end surface of the end wall of the cylindrical socket is
The inner peripheral surface of the insertion port that opens to the inner end surface of the end wall of the cylindrical socket is a conical surface with a large diameter on the inner end surface side, as well as the abutting part with the spool formed by bulging the outer periphery of the metal tube Then, a corresponding conical surface corresponding to the insertion port of this conical surface is formed on the outer periphery of the metal pipe, and the connecting portion of the metal pipe, which is continuous with the corresponding conical surface and protrudes from the inner end face side, is provided at the mounting chamber position. A rubber hose is attached to the outer periphery, and the rubber hose and the connecting portion can be caulked and fixed by a cylindrical caulking portion provided on the outer periphery of the mounting chamber.

Also, an inner pipe for reinforcement may be attached to the inner surface of the connecting portion of the metal pipe.

Further, the connecting portion of the metal tube may be provided with an annular concave and convex portion to serve as an engaging portion.

[0008]

Since the present invention is constructed as described above, in order to connect the metal tube and the rubber hose, the insertion opening of the cylindrical socket is provided with a corresponding conical surface corresponding to the conical surface of this insertion opening. Insert the metal tube. The insertion of this metal tube is
The corresponding conical surface is made to correspond to the conical surface of the insertion port, and the surface contact is made. Next, a spool that abuts the outer end surface of the end wall of the cylindrical socket is formed on the metal tube. In forming the spool, the outer periphery of the metal tube is fixed by a chuck with a spool forming interval between the spool and the outer end surface of the end wall. Then, by striking the connecting portion of the metal pipe on the side opposite to the fixed position of the chuck with the spool punch, the metal pipe is projected to the outer end face between the fixed position by the chuck and the outer end face of the end wall of the cylindrical socket. You can form a spool to hit.

Due to the formation of the spool, the pulling force in the direction of the connecting portion with respect to the metal tube is responded to by the spool hitting the end wall of the cylindrical socket, and the pulling force with respect to the metal tube in the direction of separating the spool and the end wall. Is
Corresponding by the corresponding conical surface of the metal tube abutting against the conical surface of the insertion opening having a large diameter on the inner end surface side, separation of the cylindrical socket and the metal tube does not occur. Moreover, since the insertion of the metal tube into the insertion port of the cylindrical socket is performed by the conical surface and the corresponding conical surface as described above, it is easy to assemble the metal tube and the cylindrical socket with good concentricity. As a result, it is possible to connect the metal tube and the cylindrical socket without difficulty. In addition, the conical surface and the corresponding conical surface allow the metal tube and the cylindrical socket to be assembled with good concentricity, so the spool can be abutted on the outer end surface of the cylindrical socket or the inner surface of the end wall. Therefore, it is not necessary to form the outer circumference into a perfect circle as in the spool formed in the insertion opening of the conventional example, and a high degree of working precision is not required.

As described above, in order to connect the rubber hose to the metal pipe which is securely connected and fixed to the cylindrical socket, the rubber hose is inserted and connected to the outer periphery of the connecting portion of the metal pipe. Next, the cylindrical caulking portion of the cylindrical socket is reduced in diameter from the outer periphery and caulked, whereby the cylindrical socket, the metal tube, and the rubber hose can be reliably connected and fixed.

If a reinforcing inner pipe is attached to the inner surface of the connecting portion of the metal pipe at least corresponding to the length of the caulking portion, preferably to the spool portion abutting the outer end portion. It makes it possible to strengthen the metal tube where it is most likely to be deformed by caulking, etc.

Further, the connecting portion of the metal pipe is provided with an annular unevenness to serve as an engaging portion, so that when the cylindrical socket is crimped, the inner surface of the rubber hose bites into the engaging portion of the metal pipe, The connection between the rubber hose and can be made strong.

Further, a resin film is coated on the outer periphery of the metal tube,
If this resin film is left only on the inner end face side of the connecting part of the metal pipe protruding from the inner end face side and peeled off without covering the resin film of the other connecting part to expose the metal surface, the rubber hose Even when the inner surface of the rubber hose and the metal surface of the metal pipe are in direct contact with each other at the time of connection and the adhesion is good and pulling force is applied, the pulling resistance force between the rubber hose and the metal pipe becomes strong. Further, since the resin film remains only on the inner end face side of the connecting portion of the metal pipe protruding from the inner end face side, the resin film acts as a packing by contacting this part with the inner face of the rubber hose. , The connection between the rubber hose and the metal pipe will be performed while maintaining a high degree of airtightness. The coating portion of the metal tube with the resin coating can have excellent protection against external impact and corrosion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (20) is a metal pipe, which is used as a supply passage for oil supply, air supply, etc. in automobiles, various mechanical devices, etc. It has a small diameter and a thin wall. This metal pipe (20) is formed by subjecting a raw pipe having the same diameter from one end to the other end to a certain process, and except for the connecting portion (30) with the rubber hose (21) to be connected, the outer periphery is a resin film. It is coated with (22) to enhance the corrosion resistance and impact resistance of the metal pipe (20).

The metal tube (20) is used by inserting it into an insertion port (25) provided in an end wall (24) of a metal cylindrical socket (23) having a U-shaped cross section. However, the inner surface of the insertion port (25) opened in the inner end surface (26) of the end wall (24) of the cylindrical socket (23) is formed into a conical surface (27) having a large diameter on the inner end surface (26) side. ing. Then, the corresponding conical surface (28) corresponding to the insertion port (25) of this conical surface (27) is connected to the metal pipe (2).
It is formed on the outer circumference of (0). This corresponding conical surface (28) is shown in FIG.
As shown in FIG. 3, the diameter expansion punch is held from the side of the connecting portion (30) connecting the rubber hose (21) while being held by the chuck (38).
It is formed by driving (31). The formation of the conical surface by the expanded punch 31 makes it easy to form the corresponding conical surface 28 coaxial with the center of the metal tube 20. Inside the metal pipe (20) having the corresponding conical surface (28), a reinforcing inner pipe (3) having the same corresponding conical surface is formed.
After inserting 2), the metal tube (2
The ring hose (2)
The engaging part (34) with 1) is formed. Also, this connecting part (3
The cylindrical socket (23) at the outer peripheral position of (0) has an insertion port (2
A rubber hose (21) mounting chamber (29) is formed so as to face 5).

The metal tube (20) constructed as described above is inserted into the insertion port (25) of the cylindrical socket (23). This insertion, as shown in FIG. 4, corresponds to the conical surface (28) of the metal tube (20).
Corresponding to the conical surface (27) of the cylindrical socket (23). Next, a spool (36) is formed that abuts the outer end surface (35) of the end wall (24) of the cylindrical socket (23). This spool (36) is formed by the outer end surface (35) of the end wall (24).
The outer peripheral surface of the metal tube (20) is chucked and fixed by the chuck (42) via the formation interval (37) of the spool (36) between the and. Then, by axially striking the connecting portion (30) of the metal pipe (20) on the side opposite to the fixing position of the chuck (42) with the spool punch (40), as shown in FIG. It is possible to form a spool (36) that abuts the outer end surface (35) of 24).

Due to the formation of the spool (36), the metal pipe
The pulling force toward the connecting part (30) with respect to (20) is responded by the spool (36) abutting the outer end surface (35) of the end wall (24) of the cylindrical socket (23). Also,
Metal tube in the direction to separate spool (36) and end wall (24)
The pulling-out force against (20) is such that the corresponding conical surface (28) of the metal tube (20) abuts the conical surface (27) of the insertion opening (25) on the inner end surface (26) side, and the cylindrical socket (23) ) And the metal tube (20) do not separate. Also, the insertion of the metal tube (20) into the insertion port (25) of the cylindrical socket (23) is
As described above, the conical surface (27) and the corresponding conical surface (28) are butted against each other, so that the metal tube (20) and the cylindrical socket (23) can be connected with high precision concentricity. However, it is easy to do so, and it is possible to connect the metal tube (20) and the cylindrical socket (23) smoothly and reliably.

In order to connect the rubber hose (21) to the metal pipe (20) which is securely connected and fixed to the cylindrical socket (23), the metal pipe (20) is connected as shown in FIG. Department
A rubber hose (21) is inserted and connected from the mounting chamber (29) to the outer periphery of (30). Next, a plurality of cylindrical caulking portions (41) of the cylindrical socket (23) are caulked from the outer periphery in the axial direction, whereby the cylindrical socket (23) and the metal pipe (2
0), the rubber hose (21) can be securely connected and fixed. In addition, in this connection and fixing, since the annular engaging portion (34) is formed in the connecting portion (30) of the metal pipe (20), the rubber hose (21) is fixed to the annular engaging portion (34) by caulking. It is connected in such a way that it bites into the metal tube (20) and the rubber hose (2
The connection of 1) is made firmly.

Further, in the first embodiment, the metal pipe (20) is used.
The spool (36) is formed only on the outer end surface (35) side of the end wall (24), but in another different second embodiment, as shown in FIG. 6, the inner end surface (26) of the end wall (24). The spool (39) is also formed on the side, and the spool (36) on the outer end face (35) side and the inner end face (2
The end wall (24) is sandwiched from both sides by the spool (39) on the 6) side. By providing the spools (36) (39) on both sides of the end wall (24), the metal pipe
The pulling force from any direction of (20) can be sufficiently dealt with. These two spools (36) (39)
The purpose is to prevent the metal tube (20) from being pulled out from the cylindrical socket (23), and in order to assemble the connection between the metal tube (20) and the cylindrical socket (23) with good concentricity, a conical surface The fact that (27) and the corresponding conical surface (28) are required is exactly the same as in the above-mentioned first embodiment. Further, in the embodiment shown in FIG. 6, the spool (39) is provided on the inner end surface (26) of the end wall (24).
The recess (43) for inserting the
3) is not always necessary, and the spool (39) may be butted against the flat end wall (24) having no recess (43).

[0020]

Since the present invention is constructed as described above, it corresponds to a conical surface in a fitting for a metal tube and a rubber hose that connects a relatively thin and thin metal tube with a pressure resistant rubber hose. The conical surface allows the metal tube (20) and the cylindrical socket (23) to be assembled with good concentricity, and allows the metal tube to be securely connected to the cylindrical socket without slipping out. Further, it is possible to securely connect the metal tube to the cylindrical socket with good concentricity without requiring high technology and a lot of trouble.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a connected state of a metal tube, a cylindrical socket, and a rubber hose.

FIG. 2 is a cross-sectional view showing a state in which a corresponding conical surface is formed on a metal tube.

FIG. 3 is a cross-sectional view showing a state where an annular engaging portion is formed on a metal pipe.

FIG. 4 is a cross-sectional view showing a preparation state for spool formation on a metal pipe connected to a cylindrical socket.

FIG. 5 is a cross-sectional view showing a spool forming state on a metal pipe connected to a cylindrical socket.

FIG. 6 is a cross-sectional view showing a second embodiment in which two spools are formed on a metal tube.

FIG. 7 is a cross-sectional view showing a conventionally known example.

[Explanation of symbols]

20 metal tubes 21 rubber hose 22 Resin film 23 Cylindrical socket 24 End wall 25 insertion port 26 Inner end face 27 Conical surface 28 Corresponding conical surface 29 installation room 30 connection 32 Inner pipe 34 Engagement part 35 outer end face 36 spools 41 Caulking part

Claims (3)

[Claims] 1. A metal socket and a cylindrical socket made of a metal having a U-shaped cross section in which an insertion hole for inserting the metal tube is provided in an end wall and a chamber for mounting a rubber hose is formed facing the insertion hole. , The outer end surface of the end wall of the cylindrical socket is used as an abutting portion with the spool formed by bulging the outer circumference of the metal tube, and the inner circumference of the insertion opening opened on the inner end surface of the end wall of the cylindrical socket. The inner end surface side is formed into a conical surface with a large diameter, the corresponding conical surface corresponding to the insertion port of this conical surface is formed on the outer circumference of the metal pipe, and it is continuously projected from the inner end surface side to the corresponding conical surface. A rubber hose is attached to the outer periphery of the connecting portion provided at the mounting chamber position of the metal tube, and the rubber hose and the connecting portion are
A fitting for a metal tube and a rubber hose, characterized by being able to be caulked and fixed by a cylindrical caulking portion provided on the outer periphery of the mounting chamber. 2. The fitting for connecting a metal tube and a rubber hose according to claim 1, wherein an inner pipe for reinforcement is attached to the inner surface of the connecting portion of the metal tube. 3. The fitting for connecting a metal pipe and a rubber hose according to claim 1, wherein the connecting portion of the metal pipe is provided with an annular unevenness to form an engaging portion.