JP2000146064A - Joint metal fitting for hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembly workability and seal performance, by forming a smooth tapered surface on the inside surface in an end wall of a sleeve, forming a tapered surface on the bead side of a spool, making the smooth tapered surface pressure contact with the latter tapered surface, and interposing a rubber elastic O ring between the end wall of the sleeve and the spool. SOLUTION: A nipple 1 has a sleeve mounting part 10, this mounting part 10 is constituted by forming a bead 10a and a spool 10b in parallel to each other at regular intervals. In the spool 10b, a side surface on the side of the bead 10a is formed into a smooth tapered surface 10c, a side surface on the opposite side is formed into a vertical surface 10d. The sleeve 2 is provided with an end wall 20 in one end surface, partly an inside surface 23 of this end wall 20 is formed into a smooth tapered surface, and a cutout part 23b fitting to a rubber elastic O ring 3 is provided on the side of a hole 21 of this tapered surface. In this way, when the end wall 20 is fitted to the sleeve mounting part 10, the end wall 20, by retaining its outside surface to the bead 10a, is fixedly clamped between the bead 10a and the spool 10b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint fitting for connecting a metal pipe and a rubber hose to a pressure fluid supply side. More specifically, the present invention relates to a method for mounting a rubber hose by attaching a sleeve to a nipple made of a metal pipe and caulking the sleeve. The present invention relates to a hose fitting that is fixed.

[0002]

2. Description of the Related Art Hose fittings used in automobiles and equipment for high pressure fluids, such as power steering hoses,
Joint fittings used for oil hoses, fuel hoses and the like are required to have a continuously high sealing property in order to prevent leakage. Representative examples of such fittings for hoses are disclosed in JP-A-57-57988 and JP-A-57-69.
197 is described.

The hose fitting described in the above publication is provided with a hole for fastening a metal pipe at the center of the end wall of the outer cylinder portion, and the metal pipe is radially outwardly joined at the joint position with the hole. A bulging bead is formed. Then, to attach the outer cylinder part to the metal pipe, insert the metal pipe into the hole in the end wall of the outer cylinder part, and form the metal pipe in the ring-shaped groove provided inside the end wall of the outer cylinder part. The bead projecting outward in the radial direction is fitted, and the outside of the end wall is gripped and fixed by a bead formed on the same metal pipe to be integrally attached.

In the joint fitting described in the above publication, the outer peripheral surface of the rubber hose is pushed into a plurality of ring-shaped grooves having a trapezoidal vertical cross section formed on the inner peripheral surface of the outer cylindrical portion, and is formed on the outer peripheral surface of the metal pipe. The sealing action is reliably performed by making the formed ring-shaped protrusion bite into the inner peripheral surface of the rubber hose.

[0005]

In the joint fitting described in the above publication, a metal pipe is inserted into a hole in an end wall of an outer cylinder portion, and the end wall is formed by two radially outwardly projecting beads formed on the metal pipe. By simply holding and fixing the outer tube portion to the metal pipe. Therefore, the liquid that has penetrated between the outer peripheral surface of the metal pipe and the inner peripheral surface of the rubber hose and has reached the end wall of the outer cylindrical portion may easily leak out of the hole of the end wall. Therefore, as a conventional means for improving the sealing property, there is a method of brazing the end wall of the outer cylindrical portion and the metal pipe. However, brazing takes time and costs.

In the joint fitting described in the above publication, a metal pipe is inserted into a hole in an end wall of an outer cylindrical portion, and the end wall is merely held and fixed by two projecting beads. The concentricity with the outer cylinder cannot be maintained accurately. If the hole in the end wall of the outer cylindrical portion is made the same as the outer diameter of the metal pipe in order to eliminate the variation of concentricity, the insertion of the metal pipe becomes difficult, and the assembling workability deteriorates. Also,
Conversely, when the hole in the outer cylinder portion is enlarged, the insertion of the metal pipe becomes easy, but there is a problem that the concentricity varies greatly and the liquid easily leaks.

The present invention has been made in view of such a situation, and not only is the assembling operation of a nipple made of a metal pipe and a sleeve easy, but also, a joint fitting for a hose that prevents leakage of liquid and has extremely high sealing performance. The purpose is to provide.

[0008]

The present invention has the following configuration to achieve the above object. That is, a hose fitting according to the present invention is a hose fitting comprising a nipple and a sleeve, wherein an end wall of the sleeve is fixed to a mounting portion formed by expanding a periphery of the nipple with a bead and a spool. A smooth elastic taper surface formed on the inner surface of the end wall of the sleeve and a taper surface formed on the bead side of the spool are crimped, and a rubber elastic O-ring is interposed between the end wall of the sleeve and the spool. It is characterized by. The spool is formed by bulging into a substantially triangular cross section, and the side surface on the bead side is a smooth taper surface having substantially the same angle as the taper surface on the sleeve side, and the smooth taper formed on the inner side surface of the end wall of the sleeve. It is preferable to form a cutout for fitting a rubber elastic O-ring on a part of the surface. The cutout may be formed at the nipple side end of the tapered surface formed on the inner side surface of the end wall of the sleeve, or may be formed at the middle. Further, the spool is formed so as to bulge into a substantially U-shaped cross section, and the side surface on the bead side forms a smooth tapered surface that is continuous from a vertical surface that rises substantially perpendicularly to the axis. 2 with different angles on the inner surface of the end wall
The taper surface on the nipple side of the two taper surfaces is formed smaller in angle with respect to the axis of the taper surface located on the outside, and the taper on the spool side is formed. The angle of the surface may be formed to be substantially the same as the angle of the tapered surface located outside the inner side surface of the end wall of the sleeve.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. FIGS. 1 and 2 show a first embodiment of the present invention, wherein 1 is a nipple having one end of a metal pipe as it is, and 2 is a sleeve which is attached to an outer peripheral portion of the nipple and fixes a rubber hose by caulking. 3 is the nipple 1 and the sleeve 2
And a rubber elastic O-ring disposed between the two. The other end of the nipple 1 is configured to be connectable to a hydraulic device or the like, and has a sleeve mounting portion 10 formed by expanding in a ring shape. The nipple 1 and the sleeve 2 constitute a hose fitting by being assembled together.

The sleeve mounting portion 10 is formed by forming a bead 10a and a spool 10b, which are formed by expanding a metal pipe in a ring shape, in parallel with a certain interval. The bead 10a is bulged in a substantially semicircular cross section, while the spool 10b is formed by bulging in a substantially triangular cross section. Furthermore, the spool 10b has a smooth tapered surface 10a on the side of the bead 10a.
c, and the opposite side surface is a vertical surface 10d which is a surface perpendicular to the axis. The angle θ1 of the tapered surface 10c with respect to the axis can be arbitrarily determined. In the illustrated embodiment, the angle θ1 is formed at about 45 degrees with respect to the axis.

On the other hand, the sleeve 2 has a cylindrical shape concentric with the nipple 1, and a rubber hose is fixed between the sleeve 2 and the nipple 1 by caulking inward in the entire radial direction. An end wall 20 is provided on one end surface of the sleeve 2, and a hole 21 through which the nipple 1 is inserted is formed at the center of the end wall 20.
The end wall 20 is fitted to the sleeve mounting portion 10, and the nipple 1 and the sleeve 2 are assembled integrally.

The outer surface of the end wall 20 is formed perpendicular to the axis. A part of the inner surface 23 is a smooth tapered surface 23a, and the end of the tapered surface 23a on the nipple side. A notch 23b for fitting the rubber elastic O-ring 3 is provided on the hole 21 side. End wall 2 of sleeve 2
The inner surface 23 and the vertical surface 10d of the spool 10b are formed so as to be substantially flush with each other when the "0" is fitted to the sleeve mounting portion 10 of the nipple 1. Tapered surface 23a
Is the angle θ of the tapered surface 10c of the spool 10b.
1 and in the illustrated embodiment the angle θ1
Similarly to the above, it is formed at about 45 degrees with respect to the axis.

Therefore, when the end wall 20 of the sleeve 2 is fitted to the sleeve mounting portion 10 of the nipple 1, the tapered surface 23
The concentricity of the nipple 1 and the sleeve 2 is reliably maintained by press-bonding the a and the tapered surface 10c. The entire surface of the tapered surface 23a and the tapered surface 10c are crimped, and the outer surface of the end wall 20 is pressed by the bead 10a to
a and the spool 10b. The notch 23b positions and fits the rubber elastic O-ring 3 between the notch 23b and the rising portion of the spool 10b, thereby improving the sealing performance between the nipple 1 and the sleeve 2.

Next, a second embodiment of the present invention shown in FIGS.
An embodiment will be described. In the second embodiment, the only difference is the shape of the inner surface of the spool 10b and the end wall 20 of the sleeve 2. Therefore, only different configurations will be described, and the same configurations will be denoted by the same reference numerals and description thereof will be omitted. The spool 11b of the nipple 1 is formed by bulging in a substantially U-shaped cross section.
A side surface on the 0a side is a continuous smooth tapered surface 11c from a vertical surface 11e rising vertically to the axis, and a side surface on the opposite side is a vertical surface 11d perpendicular to the axis. Although the angle θ1 of the tapered surface 11c can be arbitrarily determined, in the illustrated embodiment, the angle θ1 is
It is formed at 5 degrees.

On the other hand, the inner surface 23 of the end wall 20 of the sleeve 2
Is formed by the tapered surface 23a and the tapered surface 23c. Angle θ2 of tapered surface 23a with respect to axis
Is substantially the same as the angle θ1 of the tapered surface 11c of the spool 11b, and the angle θ3 of the tapered surface 23c with respect to the axis.
Is formed smaller than the tapered surface 23a. The relationship between the angles of the tapered surfaces is θ1 ≒ θ2> θ3. If the angle of each tapered surface is in the above relationship, the angle can be arbitrarily determined.

An annular gap is formed between the tapered surface 23c and the vertical surface 11e of the spool 11b.
A rubber elastic O-ring 3 is positioned and fitted in the annular space. By fitting the rubber elastic O-ring 3 in this manner, an extremely high sealing property can be obtained in combination with the pressure bonding between the tapered surface 11c and the tapered surface 23a.

FIGS. 5 and 6 show a third embodiment of the present invention. The third embodiment is different from the first embodiment only in the position and shape of the notch 23b. Therefore, only different configurations will be described, and the same configurations will be denoted by the same reference numerals and description thereof will be omitted.

A part of the inner side surface 23 of the end wall 20 of the sleeve 2 has a smooth tapered surface 23a, and an annular cutout 23c is provided on the tapered surface 23a. The notch 23c is formed by cutting a side wall perpendicular to the tapered surface 23a. The rubber elastic O-ring 3 fitted into the notch 23c is pressed between the notch 23c and the tapered surface 10c. Therefore, also in this embodiment, by fitting the rubber elastic O-ring 3 into the notch 23c, extremely high sealing performance can be obtained in combination with the press-fitting of the tapered surface 10c and the tapered surface 23a.

The fourth embodiment shown in FIG. 7 is a modification of the third embodiment, and is different from the third embodiment in that the side wall of the notch 23d is cut in parallel to the axis. Is different. The rubber elastic O-ring 3 fitted in the cutout 23d is pressed between the rubber elastic O-ring 3 and the tapered surface 10c,
As in the embodiment, extremely high sealing properties can be obtained.

Next, an example of a method of manufacturing the hose fitting of the first embodiment will be described. First, as shown in FIG. 8, a nipple 1 in which a spool 10b is formed on a metal pipe and a sleeve 2 are manufactured in advance. The spool 10b of the nipple 1 has one end fixed to a chuck having a tapered surface having the same angle as the tapered surface 10c by protruding the tip of the pipe by an appropriate length and pressing the punch member in the axial direction. Can be formed. On the other hand, the sleeve 2 may be manufactured by a known method such as plastic working or cutting.

Next, the rubber elastic O-ring 3 is mounted on the metal pipe on the side of the tapered surface 10c, and the metal pipe is inserted into the hole 21 of the sleeve 2 so that the tapered surface 23 of the sleeve 2 is formed.
a and the tapered surface 10c of the spool 10b are abutted and locked, and the rubber elastic O-ring 3 is fitted into the notch 23b. Thereafter, as shown in FIG. 9, the bead 10a is formed by pressing the punch member in the axial direction with these locked states. By forming the bead 10a, the end wall 20 of the sleeve 2 is gripped and fixed between the end wall 20 and the spool 10b.

A rubber hose may be inserted between the nipple 1 and the sleeve 2 of the hose fitting thus constructed, and the sleeve may be fixed by caulking.

[0023]

As is apparent from the above description, according to the present invention, the spool 10b of the nipple 1 and the inner surface of the end wall 20 of the sleeve 2 are crimped by a taper surface having substantially the same angle, and between them. Since the rubber elastic O-ring is interposed, the sealing performance is extremely improved, and leakage of the liquid can be prevented. Further, since the taper surface of the spool 10b of the nipple 1 and the inner surface of the end wall 20 of the sleeve 2 are pressure-bonded at substantially the same angle, the concentricity of the nipple and the sleeve is improved, and the sealing performance is further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a joint fitting for a rubber hose according to the present invention.

FIG. 2 is an explanatory sectional view of an upper half of a state in which a nipple and a sleeve are separated.

FIG. 3 is a sectional view of a joint fitting for a rubber hose according to a second embodiment of the present invention.

FIG. 4 is an explanatory sectional view of an upper half of a state in which a nipple and a sleeve of FIG. 3 are separated.

FIG. 5 is a sectional view of a joint fitting for a rubber hose according to a third embodiment of the present invention.

FIG. 6 is an explanatory cross-sectional view of an upper half of a state in which a nipple and a sleeve of FIG. 5 are separated.

FIG. 7 is an explanatory sectional view of an upper half of a fourth embodiment of the present invention in which a nipple and a sleeve are separated.

FIG. 8 is an explanatory sectional view showing an assembled state.

FIG. 9 is an explanatory sectional view showing a completed state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 nipple 2 sleeve 3 rubber elastic O-ring 10 sleeve mounting portion 10a bead 10b spool 10c taper surface 10d vertical surface 11b spool 11c taper surface 11d vertical surface 20 end wall 21 hole 23 inner surface 23a taper surface 23b cutout portion 23c taper surface 23d Department

Claims (5)

[Claims] 1. A hose fitting comprising a nipple and a sleeve, wherein an end wall of the sleeve is fixed to a mounting portion formed of a bead and a spool formed by bulging the outer periphery of the nipple. A hose joint characterized in that a smooth tapered surface formed on a side surface and a tapered surface formed on a bead side of a spool are pressed, and a rubber elastic O-ring is interposed between an end wall of the sleeve and the spool. Metal fittings. 2. The spool is formed by bulging into a substantially triangular cross section, and the side surface on the bead side is formed as a smooth taper surface having substantially the same angle as the taper surface on the sleeve side. A part of the formed smooth tapered surface has rubber elastic O
The hose fitting according to claim 1, wherein a notch portion for fitting the ring is formed. 3. The hose fitting according to claim 2, wherein the notch is formed at a nipple side end of a tapered surface formed on an inner surface of an end wall of the sleeve. 4. The hose fitting according to claim 2, wherein the notch is formed at an intermediate portion of a tapered surface formed on an inner surface of an end wall of the sleeve. 5. The spool is formed so as to bulge in a substantially U-shaped cross section, and the side surface on the bead side forms a smooth tapered surface that is continuous from a vertical surface that rises substantially perpendicularly to the axis. The inner surface of the end wall of the sleeve has two different angles.
The taper surface on the nipple side of the two taper surfaces is formed to be smaller than the angle with respect to the axis of the taper surface located outward, and the taper surface on the spool side is formed. 2. The hose fitting according to claim 1, wherein the angle of the surface is substantially the same as the angle of the tapered surface located outside the inner side surface of the end wall of the sleeve.