JPH1113969A - Hose connecting coupling and hose connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the positioning of the calking position of the steel pipe and the sleeve metal fitting of a hose connecting coupling accurately and simply. SOLUTION: This hose connecting coupling consists of a small diameter of steel pipe 10 having a specific thickness of round wall, and a sleeve metal fitting 20 of large diameter consisting of a thin wall steel plate. The steel pipe 10 furnishes an inserting end where the hose end of a hose can be inserted at one end; the first circular swelling 12 projecting from the outer peripheral surface of the steel pipe to the outer side in the diameter direction at the other end side of the inserting end; and the second circular swelling 13 projecting to the outer side in the diameter direction at its rear side, and formed in the diameter larger than the outer diameter of the swelling 12; while the sleeve metal fitting 20 furnishes a right cylindrical body 21; a collar 22 whose one end inner side is closed; and an assembly hole 23 which is formed in a concentric circle to the right cylindrical body 21, and its diameter is equal to or larger than the outer diameter of the swelling 12, and smaller than the outer diameter of the swelling 13. The right cylindrical body 21 is provided eccentric to the outer periphery of the inserting end and its collar 22 is abutting to the swelling 13, and the assembly hole 23 is calked in the condition held in a vally 15 between both swelling parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connection joint which is fixed to a hose end by caulking and a hose connection structure in which the hose end is inserted and fixed.

[0002]

2. Description of the Related Art Conventionally, as this kind of hose connection joint, for example, the one shown in Japanese Utility Model Publication No. 2-29352 is known. As shown in FIGS. 7 to 9, this hose connection joint has an annular bulge portion 2 a formed on one end of a thin-walled steel pipe 1 having a constant thickness by a forming process in which a mold is applied to the outer periphery and molded from the inner periphery by a molding roller. The longitudinal end shape of the insertion end 2 at the center side of the steel pipe 1 at which the hose end of the elastic hose is inserted into the outer periphery is formed by the same forming method, and the diameter thereof is increased to a substantially trapezoidal shape protruding outside the steel pipe 1. A formed sleeve mounting portion 3 is formed. The central part of the sleeve mounting part 3,
That is, the top of the trapezoid has a substantially right cylindrical shape, and both sides in the axial direction are conical. The sleeve fitting 4 has a straight cylindrical portion 5 having substantially the same length as the insertion end portion 2 and a flange portion 6 closing one end inside formed by deep drawing of a thin steel plate, and a straight cylindrical portion is formed at the center of the flange portion 6. 5, an assembly hole 7 is formed concentrically.

Then, the straight cylindrical portion 5 of the sleeve fitting 4 is
Concentrically arranged on the outer circumference of the insertion end 2 of the steel pipe 1, the mounting hole 7 of the flange 6 is located at the center outer circumference of the top of the sleeve mounting section 3, and the flange 6 is pressed from the outer circumference to form the mounting hole. 7 is crimped on the outer periphery of the center of the sleeve mounting portion 3. here,
If the clearance between the mounting hole 7 of the sleeve fitting 4 and the sleeve mounting portion 3 is too large, the sleeve fitting 4 is not properly caulked to the sleeve mounting portion 3, so that the outer diameter of the sleeve mounting portion 3 is reduced to the insertion end. It is equal to or greater than the maximum outer diameter of the part 2. Thereby, the sleeve fitting 4
And the sleeve mounting part 3
And proper crimping to the surface.

[0004]

However, in the case of the above-mentioned conventional hose connection joint, since the outer periphery of the central portion of the sleeve mounting portion 3 has a substantially straight cylindrical flat shape and has a poor positioning function with respect to the sleeve metal fitting 4, the sleeve metal fitting is not provided. It was difficult to accurately determine the swaging position of No. 4. Therefore, there is a problem that the work of caulking the sleeve fitting 4 to the sleeve mounting portion 3 takes time and a positioning jig is required.

[0005] The sleeve fitting 4 is attached to the sleeve mounting portion 3.
When the hose is inserted between the insertion end portion 2 and the straight cylindrical portion 5 of the formed hose connection joint, and the hose end portion is crimped to the insertion end portion 2 by the straight cylindrical portion 5, if the hose is not correctly positioned. Is also a problem. That is, since the swaging position of the straight cylindrical portion 5 of the sleeve fitting 4 is determined with reference to the flange portion 6, the displacement of the sleeve fitting 4 causes the straight cylindrical portion 5 to move.
The caulking recess formed by caulking overlaps with a protrusion such as a bead provided at the insertion end 2, so that an excessive load is applied to the rubber layer of the hose and the rubber layer may be easily damaged. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a hose connection joint and a hose connection structure capable of accurately and easily positioning a caulking position between a steel pipe and a sleeve fitting.

[0006]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural features of the invention according to the first aspect include a small-diameter steel pipe having a circular wall having a constant thickness, and a thin steel plate. The steel pipe has an insertion end formed at one end so that the hose end of the elastic hose can be inserted into the outer periphery, and a diameter from the outer peripheral surface of the steel pipe at the other end of the insertion end. A first annular bulge protruding outward in the direction, and a second annular bulge having an outer diameter larger than the outer diameter of the first annular bulge protruding radially outward behind the first annular bulge. A sleeve fitting is formed on the flange portion concentrically with the straight cylindrical portion, and a flange portion closing the inside of one end of the straight cylindrical portion;
A mounting hole having a diameter equal to or greater than the first annular bulge outer diameter and smaller than the second annular bulge outer diameter;
The straight cylindrical portion is disposed concentrically with the outer periphery of the insertion end of the steel pipe, and the flange portion is disposed in contact with the second annular bulging portion.
Is crimped in a state sandwiched between valleys formed between the annular bulging portion and the second annular bulging portion.

[0007] In the invention according to claim 1 configured as described above, the first annular bulging portion protruding radially outward from the outer peripheral surface of the steel pipe is formed on the other end of the insertion end of the steel pipe. A second annular bulge formed to have an outer diameter larger than the outer diameter of the first annular bulge protruding radially outward from the back thereof is continuously provided, and a diameter of an assembling hole of the sleeve fitting is provided. Are smaller than or equal to the outer diameter of the first annular bulging portion and smaller than the outer diameter of the second annular bulging portion. The part is automatically and accurately positioned by abutting the second annular bulge. Further, by crimping the collar portion of the sleeve fitting that has been positioned, the assembling hole is accurately positioned in a state sandwiched between the valleys formed between the first annular bulging portion and the second annular bulging portion. It is swaged in the positioned state. As a result, according to the first aspect of the present invention, it is possible to accurately and easily position the caulking position between the steel pipe and the sleeve fitting, and it is not necessary to use an extra positioning jig or the like.
The working time can be reduced, and the manufacturing cost of the hose connection joint can be reduced.

The structural feature of the invention according to claim 2 is that it comprises a small-diameter steel pipe having a circular wall with a constant thickness and a large-diameter sleeve fitting made of a thin steel plate. An insertion end formed so that the hose end of the elastic hose can be inserted into the outer periphery; a first annular bulge protruding radially outward from the outer peripheral surface of the steel pipe at the other end of the insertion end; A second annular bulge projecting radially outwardly behind the annular bulge and having an outer diameter larger than the outer diameter of the first annular bulge. A part and a flange that closes one end inside are formed on the flange concentrically with the right cylindrical part,
A mounting hole having a diameter equal to or greater than the first annular bulge outer diameter and smaller than the second annular bulge outer diameter;
The straight cylindrical portion is disposed concentrically with the outer periphery of the insertion end of the steel pipe, and the flange portion is disposed in contact with the second annular bulging portion.
A hose connection joint crimped in a state of being sandwiched between valleys formed between the annular bulging portion and the second annular bulging portion, between the insertion end of the steel pipe and the straight cylindrical portion of the sleeve fitting. The hose end of the elastic hose is inserted, and the hose end is crimped from the outer periphery to the insertion end by a straight cylindrical portion.

In the invention according to claim 2 configured as described above, the sleeve fitting is accurately positioned and crimped at the insertion end of the steel pipe, and is inserted between the insertion end of the hose connection joint and the straight cylindrical portion. When the hose end of the elastic hose is inserted, the hose end is crimped to the insertion end from the outer periphery by the straight cylindrical portion, so that the hose end is positioned and connected to the hose connection joint. Is done.

After the hose end is inserted, the straight cylindrical portion is caulked on the basis of the flange, and the flange is provided by a second annular bulge provided at the other end of the steel tube insertion end. Since it is accurately positioned, it is performed at an appropriate caulking position. Therefore, even when an annular convex portion such as a bulge portion or a bead portion projecting outward in the radial direction is formed on the outer periphery of the insertion end portion of the steel pipe, a caulked concave portion formed by caulking the sleeve fitting and the insertion end portion are formed. Thus, the problem that the rubber layer of the hose is damaged due to an excessive load applied to the rubber layer of the hose due to the overlap can be reliably prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hose connection joint according to the present invention will be described below with reference to an embodiment shown in FIGS. At one end of a thin steel pipe 10 having an outer diameter of 4.76 mm and a wall thickness of 0.7 mm, an insertion end 11 into which the hose end 31 of the elastic hose 30 is inserted is provided. 11
A first annular bulging portion 12 having an outer diameter of 5.6 mm protruding radially outward from the outer peripheral surface of the steel pipe 10 by punching, and projecting radially outward behind the first annular bulging portion 12. The diameter is 7.
A second annular bulge 13 is formed at an outer diameter larger than the outer diameter of the first annular bulge 12 of 0 mm. And the first
A wavy valley 15 is formed between the annular bulging portion 12 and the second annular bulging portion 13, and a bead having an outer diameter of 5.6 mm, which is an annular convex portion, is provided at an intermediate position in the axial direction of the insertion end 11. Part 14,
Two are formed by punching at intervals in the axial direction.

The sleeve fitting 20 has a straight cylindrical portion 21 having an outer diameter of 13.6 mm and a length substantially equal to the length of the insertion end portion 11 formed by deep drawing a 0.8 mm thick thin steel plate, and one end inside thereof. Is formed, and an assembling hole 23 having a diameter of 5.7 mm is formed concentrically with the straight cylindrical portion 21 in the center of the flange portion 22.

The straight cylindrical portion 21 of the sleeve fitting 20 is concentrically positioned on the outer periphery of the insertion end 11 of the small-diameter steel pipe 10, and the flange 22 is provided with a second annular bulge at the other end of the insertion end 11. 13, the flange 22 is pressed from the outer periphery, and the assembling hole 23 is sandwiched between the valleys 15 formed between the first annular bulging portion 12 and the second annular bulging portion 13. It is a crimped state.

In this caulking, the flange 22 is smaller than the outer diameter of the second annular bulge 13 and the first annular bulge 1
2 Because it is larger than the outer diameter, as shown in FIG.
The flange portion 22 abuts on the second annular bulging portion 13, and the positioning of the insertion of the sleeve fitting 20 is automatically and accurately performed.
In this manner, by caulking the accurately positioned collar portion 22, the assembling hole 23 is caulked in a state of being sandwiched between the valleys 15 formed between the annular bulging portions 12 and 13, The desired hose connection joint shown in FIG. 1 is obtained.

As described above, according to the above embodiment, the caulking position between the steel pipe 10 and the sleeve fitting 20 can be accurately and easily determined, and it is also necessary to use an extra positioning jig or the like. Therefore, the working time can be reduced, and a product of stable quality can be manufactured at low cost.

Next, a hose connection structure using the hose connection joint will be described. The sleeve fitting 20 is accurately positioned and crimped on the insertion end 11 of the steel pipe 10 and between the insertion end 11 and the straight cylindrical portion 21 of the hose connection joint.
As shown in FIG. 5, the hose end 31 of the elastic hose 30 is inserted. In the state where the hose end 31 is inserted, the hose end 31 is crimped from the outer periphery to the insertion end 11 by the straight cylindrical portion 21 so that the hose end 31 is positioned as shown in FIG. Connected to the hose connection joint, a hose connection structure is obtained.

Further, the straight cylindrical portion 21 is swaged by a flange portion 22.
However, since the collar portion 22 is accurately positioned by the second annular bulging portion 13 of the insertion end portion 11, it is performed at an appropriate caulking position. Therefore, even when the bead portion 14 protruding radially outward is formed on the outer periphery of the insertion end portion 11 of the steel pipe 10 as in the present embodiment, the caulking recess formed by caulking the straight cylindrical portion 21. 21a and the bead portion 14 do not overlap, and as a result, it is possible to reliably prevent a problem that an excessive load is applied to the rubber layer of the hose end 31 and the rubber layer is damaged.

[Brief description of the drawings]

FIG. 1 is a partially broken sectional view schematically showing a hose connection joint according to an embodiment of the present invention.

FIG. 2 is a partially broken sectional view showing a steel pipe used for the hose connection joint.

FIG. 3 is a partially broken sectional view showing a sleeve fitting used for the hose connection joint.

FIG. 4 is a partially broken cross-sectional view showing a state before swaging a sleeve fitting of the hose connection joint.

FIG. 5 is a partially broken sectional view showing a state where a hose is inserted into the hose connection joint.

FIG. 6 is a partially broken sectional view showing a hose connection structure.

FIG. 7 is a partially broken sectional view showing a steel pipe used for a hose connection joint as a conventional example.

FIG. 8 is a sectional view showing a sleeve fitting used for the hose connection joint.

FIG. 9 is a partially broken sectional view showing the hose connection joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... steel pipe, 11 ... insertion end part, 12 ... 1st annular bulging part, 13 ... 2nd circular bulging part, 14 ... bead part, 15 ...
Valley, 20: sleeve fitting, 21: straight cylindrical portion, 22: flange portion, 23: mounting hole, 30: elastic hose, 31: hose end.

Claims (2)

[Claims] A small-diameter steel pipe having a circular wall having a constant thickness;
The steel pipe comprises a large-diameter sleeve fitting made of a thin steel plate, wherein the steel pipe has an insertion end formed at one end thereof so that the hose end of the elastic hose can be inserted into the outer periphery, and the steel pipe at the other end of the insertion end. A first annular bulge protruding radially outward from the outer peripheral surface of the first bulge, and a radially outward bulge behind the first annular bulge larger than the outer diameter of the first annular bulge A second annular bulging portion formed at an outer diameter, wherein the sleeve fitting is formed on the straight cylindrical portion, a flange portion closing one end inside thereof, and the flange portion concentrically with the straight cylindrical portion. A mounting hole having a diameter equal to or larger than the outer diameter of the first annular bulging portion and smaller than the outer diameter of the second annular bulging portion, wherein the straight cylindrical portion is an insertion end of the steel pipe. The flange is arranged concentrically on the outer periphery and abutted against the second annular bulge, and the mounting hole is formed in the first annular bulge. Out section and the hose connection fitting, characterized in that has been crimped onto the state of being sandwiched between the valley formed between the second annular swelling portion. 2. A small diameter steel pipe having a circular wall with a constant thickness,
The steel pipe comprises a large-diameter sleeve fitting made of a thin steel plate, and the steel pipe has an insertion end formed at one end thereof so that the hose end of the elastic hose can be inserted into the outer periphery, and the steel pipe at the other end of the insertion end. A first annular bulge protruding radially outward from the outer peripheral surface of the first bulge, and a radially outward bulge behind the first annular bulge larger than the outer diameter of the first annular bulge A second annular bulging portion formed at an outer diameter, wherein the sleeve fitting is formed on the straight cylindrical portion, a flange portion closing one end inside thereof, and the flange portion concentrically with the straight cylindrical portion. A mounting hole having a diameter equal to or larger than the outer diameter of the first annular bulging portion and smaller than the outer diameter of the second annular bulging portion, wherein the straight cylindrical portion is an insertion end of the steel pipe. The flange portion is arranged concentrically on the outer periphery and abutted against the second annular bulging portion, and the mounting hole is provided in the first annular bulging portion. A hose connection joint crimped in a state of being sandwiched between valleys formed between the portion and the second annular bulging portion, wherein the elasticity is provided between the insertion end of the steel pipe and the straight cylindrical portion of the sleeve fitting. A hose connection structure, wherein a hose end portion of a hose is inserted, and the hose end portion is caulked from an outer periphery to the insertion end portion by the straight cylindrical portion.