JP3396024B2 - Hose fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for connecting a metal pipe of a pressure fluid supply side and a rubber hose, and more specifically, to 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 Joint fittings for hoses used in automobiles and high-pressure fluid equipment, such as power steering hoses,
Joint fittings used for oil hoses, fuel hoses, etc. are required to have high continuous sealing properties to prevent liquid leakage. Typical examples of such hose fittings are Japanese Patent Laid-Open Nos. 57-57988 and 57-6.
There is one described in Japanese Patent No. 9197.

The hose joint fitting described in JP-A-57-57988 is provided with a hole for fastening a metal pipe in the center of the end wall of the outer cylinder portion, and the metal pipe is connected to the hole. A bead is formed that bulges outward in the radial direction at the joining position. Then, to attach the outer cylinder portion to the metal pipe, insert the metal pipe into the hole of the end wall of the outer cylinder portion, and fit the bead into the ring-shaped groove provided inside the end wall of the outer cylinder portion. Further, the outside of the end wall is integrally attached by gripping and fixing it by another bead formed on the same metal pipe.

Further, in the joint fitting described in the above publication, the outer peripheral surface of the rubber hose can be pushed into the plurality of trapezoidal ring-shaped grooves formed in the inner peripheral surface of the outer cylinder portion and formed on the outer peripheral surface of the metal pipe. The ring-shaped protrusions bite into the inner peripheral surface of the rubber hose to ensure the sealing action.

[0005]

SUMMARY OF THE INVENTION The joint fitting described in the above publication has a metal pipe inserted into a hole in an end wall of an outer cylinder portion, and the end wall is formed by two beads protruding outward in a radial direction formed on the metal pipe. The outer cylinder portion is simply attached to the metal pipe by gripping and fixing. 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 reaches the end wall of the outer tubular portion may easily leak to the outside from 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 cylinder portion and the metal pipe. However, brazing is time-consuming and costly.

Further, in the joint fitting described in the above publication, the metal pipe is inserted into the hole of the end wall of the outer cylinder portion, and the end wall is only gripped and fixed by the two protruding beads. The concentricity with the outer cylinder cannot always be kept accurate. If the hole in the end wall of the outer tubular portion is made to have the same diameter as the outer diameter of the metal pipe in order to eliminate the variation in concentricity, it becomes difficult to insert the metal pipe and the assembling workability deteriorates. On the other hand, if the hole in the outer cylinder portion is made larger, the metal pipe can be easily inserted, but there is a problem that the concentricity becomes large and the liquid easily leaks.

The present invention has been made in view of the above circumstances, and not only facilitates the assembling work of a nipple made of a metal pipe and a sleeve, but also prevents leakage of liquid and has an extremely high sealing property for a hose fitting. The purpose is to provide. .

[0009]

In order to achieve the above object, the present invention has the following constitution. That is, the hose fitting according to the present invention comprises a nipple and a sleeve, and the hose fitting is formed by fixing the end wall of the sleeve to a bead formed by bulging the outer circumference of the nipple and a spool mounting portion. And forming two taper surfaces on the inner surface of the end wall of the sleeve having different angles of inclination with respect to the axis and forming an intersecting portion of the two taper surfaces as an annular corner portion, and forming the spool into a substantially triangular cross section. The side surface on the bead side is bulged to form a smooth tapered surface, and the angle θ1 of the taper surface of the spool is an angle between the two taper surfaces θ2 and θ3 of the sleeve end surface. It is characterized in that the annular corner portion is pressure-bonded to the tapered surface of the spool. Therefore, the relationship between the tapered surfaces is θ2> θ1
> Θ3. Further, it is preferable that the side surface of the spool opposite to the bead side is formed as a vertical surface which is substantially perpendicular to the axis.

The hose fitting according to the present invention comprises a nipple and a sleeve, and the end wall of the sleeve is fixed to a bead formed by bulging the outer periphery of the nipple and a spool mounting portion. In the joint fitting, a tapered surface is formed on the inner surface of the end wall of the sleeve, and an annular projection is formed at an appropriate position on the tapered surface, while the spool is formed by bulging in a substantially triangular cross section. The side surface on the side is formed as a smooth tapered surface, and the annular projection is pressure-bonded to the tapered surface of the spool. The tapered surface formed on the inner surface of the end wall of the sleeve is
It may be formed so that the angles of the tapered surfaces on both sides of the annular protrusion are different, or they may be formed at the same angle with the annular protrusion interposed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the drawings. In FIG. 1, 1 is a nipple made of a metal pipe, 3 is a sleeve attached to the outer periphery of the nipple, and the nipple 1 is configured such that the other end thereof can be connected to a hydraulic device or the like. The nipple 1 and the sleeve 3 form a joint fitting for a hose by integrally assembling the sleeve 3 with a sleeve mounting portion 5 formed by partially bulging a metal pipe in an annular shape. A rubber hose is inserted between the nipple 1 and the sleeve 3 and the sleeve 3 is caulked to fix the rubber hose.

The sleeve mounting portion 5 is formed by forming a bead 5a and a spool 5b, which are formed by bulging a metal pipe in an annular shape, and are parallel to each other with a constant interval. The bead 5a is formed by bulging in a substantially arcuate cross section, while the spool 5b is formed by bulging in a substantially triangular cross section. Further, in the spool 5b, the side surface on the bead 5a side is a smooth tapered surface 50, and the side surface on the opposite side is a vertical surface 51 that is substantially perpendicular to the axis. The angle θ1 of the tapered surface 50 can be arbitrarily determined, but in the illustrated embodiment, it is formed at about 45 degrees with respect to the axis.

An annular groove 7 is formed at the tip of the nipple 1 which serves as an insertion port for the rubber hose. The annular groove 7 is formed to have a width and a depth such that the inner surface rubber of the hose enters when the sleeve 3 is caulked but is not completely filled. For example, the groove width is 1 to 5 mm and the depth is 1 to 5. 3m
m, and the upper edge corner is 0.1 to prevent the inner rubber from breaking.
It is desirable to set it to 1R. The annular groove 7 absorbs the inner surface rubber of the hose escaping to the tip of the nipple when the sleeve is caulked, and prevents the inner surface rubber from bulging annularly at the tip surface of the nipple.

On the other hand, the sleeve 3 is constructed by providing a caulking portion 30 having a cylindrical shape concentric with the nipple 1, and an end wall 31 on one end surface of the caulking portion 30. The nipple 1 is inserted through the center of the end wall 31, and the caulking portion 30
An insertion hole 33 that is concentric with is formed. The end wall 31 is fitted to the sleeve mounting portion 5 so that the nipple 1 and the sleeve 3
Are assembled together. The wall thickness of the end wall 31 is larger than the wall thickness of the caulking portion 30 in the illustrated embodiment. When the end wall 31 of the sleeve 3 is fitted to the sleeve mounting portion 5 of the nipple 1, the inner surface 35 and the spool 5
The vertical surface 51 of b is formed to be substantially the same surface.

The outer surface of the end wall 31 is formed perpendicularly to the axis, but a part of the inner surface 35 is formed by two tapered surfaces 37 and 39. The angle θ2 of the tapered surface 37 with respect to the axis is larger than the angle θ1 of the tapered surface 50 of the spool 5b, and in the illustrated embodiment, it is formed at about 48 degrees with respect to the axis. On the other hand, the angle θ3 of the tapered surface 39 with respect to the axis is the tapered surface 5
The angle is smaller than the angle θ1 of 0, and is formed at about 42 degrees with respect to the axis in the illustrated embodiment. As described above, the intersection of the tapered surface 37 and the tapered surface 39 is formed into the protruding annular corner portion 40, and the angle relationship between the tapered surfaces is θ2> θ.
1> θ3. The angle of each taper surface is θ2>θ1> θ
With the relationship of 3, each angle can be arbitrarily determined.

Therefore, when the end wall 31 of the sleeve 3 is fitted to the sleeve mounting portion 5 of the nipple 1, the outer surface of the end wall 31 is pressed by the bead 5a and is gripped and fixed between the bead 5a and the spool 5b. To be done. The taper surface 37 and the taper surface 39 are not joined to the taper surface 50 and the annular corner 40 is formed.
Line contact by. Since the annular corner portion 40 is pressed into the tapered surface 50 so as to bite into the tapered surface 50, the end wall 31 of the sleeve 3 and the spool 5b of the nipple 1 are reliably sealed. Moreover, the annular corner 40
Is joined to the taper surface 50 of the spool 5b, the concentricity of the nipple 1 and the sleeve 3 is surely maintained, and an extremely high sealing property is obtained in combination with the line contact.

FIGS. 3 and 4 show a second embodiment of the present invention, in which the nipple has the same shape as the embodiment of FIG. 1, but a notch is provided on the inner surface of the end wall of the sleeve. Is different. Therefore, the same components are designated by the same reference numerals and the description thereof is omitted. End wall 3 of sleeve 3
A notch 41 is provided on the inner surface of No. 1, and a taper surface 37 and a taper surface 39 are formed following the notch 41. The notch 41 has a size such that the spool 5b can be fitted therein, and when the annular corner 40 abuts on the tapered surface 50 of the spool 5b, the inner surface 35 and the vertical surface 51 of the spool 5b are substantially formed. They are formed so that they are flush with each other.

When the cutout portion 41 for fitting the spool 5b is provided on the inner surface of the end wall 31 of the sleeve 3 as in the above embodiment, there is no recess between the end wall 31 and the spool 5b. Inflow of rubber can be prevented.

FIG. 5 shows a third embodiment of the present invention, and the inner wall shape of the end wall of the sleeve is different from that of the second embodiment. Therefore, the same components are designated by the same reference numerals and the description thereof is omitted. In this embodiment,
A part of the inner surface 35 of the end wall 31 of the sleeve 3 is attached to the spool 5
The taper surface 43 of the same angle as the angle θ1 of the taper surface 50 of b
And the annular projection 4 is formed at an appropriate position on the tapered surface 43.
5 is projected. End wall 31 of sleeve 3 and nipple 1
When they are butted against the spool 5b of
Since they are pressed into the tapered surface 50 so as to bite linearly, the end wall 31 and the spool 5b are reliably sealed.

In the third embodiment, the taper surface of the inner side surface 35 of the end wall 31 of the sleeve 3 is the spool 5b.
Although the taper surface 50 is formed at the same angle as the angle θ1 of the taper surface 50, the taper surface has an annular projection 45 as in the first and second embodiments.
It may be formed so as to be different on both sides of the taper, for example, it may be formed as the tapered surface 37 and the tapered surface 39. Alternatively, one side may be formed at the same angle as the tapered surface 50 with the annular projection 45 interposed, and only the other side may be the tapered surface 37 or the tapered surface 39.

Next, an example of a method of manufacturing the hose joint fitting comprising the nipple 1 and the sleeve 3 will be described with reference to the first embodiment. First, as shown in FIG. 6, a nipple 1 in which a spool 5b and an annular groove 7 are formed in a metal pipe and a sleeve 3 are manufactured in advance. The spool 5b of the nipple 1 can be formed by projecting and fixing one side to a chuck having a tapered surface having the same angle as the tapered surface 50 by an appropriate length and pressing the punch member in the axial direction. . Further, the annular groove 7 can be formed by the press processing as described above, or may be formed by the knurling processing. The sleeve 3 may be manufactured by a known method such as cutting.

Then, a metal pipe is inserted into the hole 33 of the sleeve 3, the taper surface provided on the inner surface of the end wall 31 of the sleeve 3 and the taper surface 50 of the spool 5b are abutted against each other, and the annular corner portion 40 is brought into contact. After that, as shown in FIG. 7, the bead 5a is formed by pressing the punch member in the axial direction in the contact state. By forming the bead 5a, the end wall 31 of the sleeve 3 is gripped and fixed between the end wall 31 and the spool 5b. In order to fix the rubber hose to the hose joint fitting thus formed, the rubber hose may be inserted between the nipple 1 and the sleeve 3 and then the sleeve may be caulked.

In order to prevent the deformation of the nipple when the sleeve 3 is swaged, as shown by a phantom line in FIG.
An inner tube may be inserted in the nipple 1. When the inner tube is inserted into the nipple 1, the tip of the inner tube is brought into contact with and locked by the bulging portion of the annular groove 7 into the nipple, so that the inner tube is securely placed at the predetermined position of the nipple 1. Not only can it be inserted, but the inserted inner tube can be prevented from shifting.

[0024]

As is apparent from the above description, according to the present invention, the spool 5b of the nipple 1 and the inner surface of the end wall 31 of the sleeve 3 are annularly in line contact with each other.
A high sealing property can be obtained and liquid leakage can be prevented. In addition, since the tapered surfaces of the metal pipe and the sleeve are made to abut against each other, concentricity is improved in assembling the both, and a higher sealing property is obtained.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view for explaining the upper half of a state where a nipple and a sleeve are separated.

FIG. 3 is a cross-sectional view of a hose fitting according to a second embodiment.

FIG. 4 is a sectional view for explaining the upper half of the state where the nipple and the sleeve are separated from each other.

FIG. 5 is an upper half sectional view of a sleeve according to a third embodiment.

FIG. 6 is an explanatory sectional view showing an assembled state.

FIG. 7 is an explanatory sectional view showing a completed state.

[Explanation of symbols]

1 nipple 3 sleeves 30 caulking section 31 End wall 33 holes 35 Inside 37 Tapered surface 39 Tapered surface 40 annular corner 41 Notch 5 Sleeve mount 5a bead 5b spool 50 taper surface 51 vertical plane

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-57988 (JP, A) JP-A-57-69197 (JP, A) JP-A-8-14459 (JP, A) Actual development Sho-62- 15686 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 33/20

Claims (6)

(57) [Claims] 1. A hose joint fitting comprising a nipple and a sleeve, the end wall of the sleeve being fixed to a bead and spool mounting portion formed by bulging the outer periphery of the nipple, and the inner surface of the end wall of the sleeve. Is formed by forming two tapered surfaces with different angles of inclination with respect to the axis, forming an intersection of the two tapered surfaces with an annular corner, and swelling the spool in a substantially triangular cross section. The side surface on the bead side is formed as a smooth tapered surface, and the angle θ1 of the taper surface of the spool is an angle between the angles θ2 and θ3 of the two taper surfaces of the sleeve end surface, and the annular corner portion is A fitting for a hose characterized by being crimped onto the taper surface of the spool. 2. The hose fitting according to claim 1, wherein the angle of the tapered surface with respect to the axis is θ2>θ1> θ3. 3. The hose fitting according to claim 1, wherein the side surface of the spool opposite to the bead side is formed as a vertical surface which is substantially perpendicular to the axis. 4. A hose joint fitting comprising a nipple and a sleeve, the end wall of the sleeve being fixed to a bead and spool mounting portion formed by bulging the outer periphery of the nipple, and the inner surface of the end wall of the sleeve. A tapered surface is formed at the same time, and an annular projection is formed at an appropriate position on the tapered surface, while the spool is formed by bulging in a substantially triangular cross-section so that the side surface on the bead side is a smooth tapered surface. A hose joint fitting, characterized in that the annular projection is crimped onto a taper surface of a spool. 5. The hose fitting according to claim 4, wherein the tapered surface formed on the inner surface of the end wall of the sleeve has different angles between the tapered surfaces on both sides of the annular projection. 6. The hose joint fitting according to claim 4, wherein the tapered surfaces formed on the inner surface of the end wall of the sleeve are formed at the same angle with the annular projection interposed therebetween.