JPS61286692A - Manufacture of hose mouthpiece - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a hose cap, and the method of manufacturing a hose for guiding hydraulic pressure to the power steering of an automobile.
Can be used for hose fittings through which medium-high pressure fluid flows, such as air conditioner hoses and brake hoses.

[Prior Art] Conventionally, in order to manufacture a cap for a power steering hose, for example, as shown in FIGS. 8 to 10, a ring-shaped engagement groove 7 is formed on the surface of a nipple 71 by rolling or cutting.
3, and the peripheral end wall 74 forming the center hole of the sleeve 72 is pressed into the engagement groove 73 so as to be engaged therewith. In the thus obtained cap, the engagement groove 73 is intended to prevent relative movement of the sleeve 72 and the nipple 71 in the axial direction.

[Problems to be Solved by the Invention] In the conventional manufacturing method described above, in order to prevent fluid leakage and to obtain sufficient joint strength between the sleeve and the nipple, the thickness of the peripheral end wall forming the center hole of the sleeve must be , and the width of the nipple engagement groove, each of which required considerable precision.

Furthermore, when joining the nipple and the sleeve, it is necessary to reliably position the peripheral end wall of the sleeve at the position of the engagement groove of the nipple, which requires high positional accuracy. This required strict quality control, which took time to manufacture.

The present invention has been made in view of the above problems, and provides a method for manufacturing a hose cap in which the sleeve is more strongly fastened to the nipple than in the past, and in which manufacturing and quality control are easier.

[Means for Solving the Problems] The method for manufacturing a hose cap of the present invention provides two tubes arranged in parallel at intervals in the axial direction of the nipple on the outer surface of a cylindrical nipple.
a groove forming step in which two ring-shaped grooves are formed; and the nipple is inserted into a cylindrical sleeve having a center hole on one end surface having a diameter approximately corresponding to the outer diameter of the nipple and an opening on the other end surface. , an insertion step of positioning the peripheral end surface of the center hole on the outer surface of the nipple held between the two ring-shaped grooves, and engaging a pair of pressing members with the two ring-shaped grooves; a pressing step of pressing the side walls of the two ring-shaped grooves toward each other using a pair of pressing members, so that the outer surface of the nipple held between the two ring-shaped grooves bulges outward in the radial direction. The sleeve and the nipple are integrally fastened by pressing the peripheral end surface of the center hole in the radial direction.

The nipple used in the manufacturing method of the present invention usually has a cylindrical shape and is inserted into the inside of the hose. The fluid flowing inside the hose is then supplied to other parts through the inside of the nipple. Therefore, the outer diameter of the nipple should approximately correspond to the inner diameter of the hose, preferably slightly larger than the inner diameter of the hose, to prevent liquid from easily leaking from the abutment surface of the hose and nipple. In order to prevent the hose from falling off the nipple, it is also preferable to provide grooves, protrusions, etc. on the outer surface of the portion of the nipple that is inserted into the hose.

The sleeve used in the manufacturing method of the present invention usually has a cylindrical shape with an inner diameter substantially corresponding to the outer diameter of the hose, and one end surface is provided with a center hole and the other end surface is open. A nipple is inserted into the center hole provided on one end surface, and the sleeve and nipple are fastened and integrated by a pressing process, which will be described later, to form a hose cap. Then, the hose is inserted into the sleeve, and the nipple is inserted into the hose inside the sleeve. Then, by applying radial pressure from the outside surface of the sleeve, the hose is clamped and crimped between the inside surface of the sleeve and the outside surface of the nipple. Ru. This integrates the cap and the hose. Note that the nipple and sleeve mentioned above can be of almost the same shape as conventional ones, and the material of the nipple and sleeve can be made of various metals such as mild steel, aluminum, copper, etc. depending on the purpose, regardless of whether they are made of the same material or different materials. You can choose. The thickness of the peripheral wall forming the central hole is
There is no need to match the width of the engagement groove as in the past,
High precision is not required.

The groove forming step is a step of forming two ring-shaped grooves, each of which goes around the circumferential direction of the nipple, on the surface of the nipple. The width and depth of this ring-shaped groove can be freely set according to the shape of the pressing member, which will be described later. Further, the interval between the respective ring-shaped grooves can be selected to be larger or smaller than the thickness of the peripheral end wall forming the center hole of the sleeve, but it is preferably 70% to 200% of the thickness of the peripheral end wall. If it deviates from this range, the fastening force and prevention of leakage will be insufficient. This ring-shaped groove can be formed by cutting or rolling in the same manner as in the past, and precision is not required as in the past.

The insertion process is a process of inserting and positioning the nipple into the sleeve. In this insertion step, it is necessary to position the peripheral end surface of the center hole of the sleeve on the surface of the nipple sandwiched between the two ring-shaped grooves. In this case, the two ring-shaped grooves may be located so that a part or all of the grooves overlap the circumferential end surface of the center hole, but the two ring-shaped grooves may be placed on both sides of the circumferential end wall within the above-mentioned interval. It is desirable to locate it at a certain distance from the wall.

Conventionally, this insertion process does not require highly accurate positioning. That is, it is sufficient that at least the peripheral end surface of the center hole of the sleeve is located on a part of the outer surface of the nipple sandwiched between the two ring-shaped grooves. However, in order to obtain sufficient fastening force and leakage prevention performance, it is desirable to increase the contact area between the peripheral end surface and the outer surface of the nipple. Therefore, it is desirable to position it at such a position.

The pressing step is a step of pressing the side walls of the two ring-shaped grooves with a pair of pressing members. That is, the side walls of the two ring-shaped grooves are pressed so as to approach each other. Then, the outer surface of the nipple sandwiched between the two ring-shaped grooves bulges outward mainly in the radial direction and presses against the peripheral end surface of the center hole of the sleeve. Thereby, the nipple and the sleeve are integrally fastened. In this case, if the two ring-shaped grooves are located a certain distance apart on both sides of the peripheral end wall forming the center hole of the sleeve, the part sandwiched by the two ring-shaped grooves by pressing will first touch the peripheral end surface of the sleeve. When the sleeve bulges out while being pressed and the pressing is continued, protrusions are formed on both sides of the peripheral end wall of the sleeve. By further pressing this protrusion, the protrusion is brought into pressure contact with both sides of the peripheral end wall forming the center hole. This increases the surface area of the coupling portion between the nipple and the sleeve, further increasing the coupling force and leakage prevention performance.

The pressing member to be used may be, for example, shaped like a cylindrical member cut vertically in half and having a center hole at one end with a diameter approximately equivalent to the outer diameter of the nipple at the bottom of the ring-shaped groove. I can do it.

[Operations and Effects of the Invention] In the manufacturing method of the present invention, when the nipple and the sleeve are fastened together, a bulge is formed by pressing two ring-shaped grooves of the nipple toward each other, and the bulge is This fastens the nipple and the peripheral end wall forming the center hole of the sleeve.

The height of this bulge can be adjusted by adjusting the pressing force.

Therefore, the machining accuracy of the nipple and sleeve before fastening is not as high as required in the past (and the manufacturing of each is simplified. In addition, the ring-shaped groove provided on the nipple engages the pressing member and transmits the pressing force. Therefore, the width and depth require almost no precision compared to conventional engagement grooves.

Furthermore, precision in positioning the nipple and sleeve is not required heretofore. As a result of this, products with well-balanced performance can be stably produced, so quality control does not have to be as strict as in the past. Therefore, productivity is improved. Furthermore, by positioning the ring-shaped grooves at a certain distance on both sides of the peripheral end wall forming the center hole, a protrusion that sandwiches the peripheral end wall is formed. Therefore, the area of the joint between the nipple and the sleeve is significantly increased compared to the conventional art, and the strength of the fastening part and prevention of fluid leakage are further ensured. Furthermore, the sleeve
Since there is no pressure bonding, the present invention has excellent effects such as a smooth surface and excellent appearance.

[Example] This will be explained in detail below using Examples.

(First Embodiment) FIGS. 1 to 4 show diagrams relating to a manufacturing method according to a first embodiment of the present invention. First, on the surface of the nipple 20 made of mild steel,
Two ring-shaped grooves 21 and 22 were formed by rolling.

The distance between the ring-shaped groove 21 and the ring-shaped groove 22 is 6 mm larger than the thickness of the peripheral end wall 11 forming the center hole of the sleeve 1o.
It is formed 0% longer. As shown in FIG.
0 was inserted into the sleeve 10. Thereafter, as shown in FIG. 2, a pair of pressing members 30 and 31 were fitted into the nipples and fastened, respectively, and the pressing teeth 30a131a of the pressing members were engaged with the ring-shaped grooves 21.22. Note that this pressing member has a shape obtained by vertically dividing a cylinder in half, as shown in FIG.

Then, the pair of pressing members 30 and 31 were pressed using hydraulic pressure at a pressure of 50 kQ/mm'' so that they came close to each other.This caused the ring-shaped groove 21.
The portion sandwiched by 2 bulged outward in the radial direction as shown in FIG. 4, and came into pressure contact with the peripheral end surface 12 of the sleeve 10. When the pressing is continued further, protrusions 23 are formed on both sides of the peripheral end wall 11.
24 was formed, and the peripheral end wall 11 was sandwiched and pressed by the pressure of the pressing members 30 and 31. In the obtained hose cap, the sleeve 10 and the nipple 20 were integrally and reliably fastened. Further, due to the effect of the protrusions 23 and 24, there was no fluid leakage at all.

(Second Embodiment) FIGS. 5 to 7 show diagrams relating to a manufacturing method according to a second embodiment of the present invention. In this embodiment, the distance between the two ring-shaped grooves 51 and 52 formed in the nipple 50 is
The same sleeve and nipple as in the first embodiment were used, except that the sleeve and nipple were formed to be slightly smaller than the thickness of the peripheral end wall 41 of the sleeve. Then, as in the first embodiment, the nipple 50 is attached to the sleeve 4.
0, and insert the peripheral end wall 41 of the sleeve 40 into the ring-shaped groove 5.
It was placed between 1.52 and 1.52. Then, as shown in FIG. 6, the tips of the pair of pressing members 60 and 61 were engaged with the ring-shaped grooves 51 and 52, and pressed so as to approach each other as in the first embodiment. As a result, two ring-shaped grooves 51.
As shown in FIG. 7, the portion sandwiched by the sleeve 52 bulged outward in the radial direction and pressed against the peripheral end surface 42 of the sleeve 4o. As a result, the nipple 50 and the sleeve 40 were integrally fastened.

[Brief explanation of the drawing]

1 to 4 relate to the manufacturing method of the first embodiment of the present invention, FIG. 1 is a sectional view showing the nipple inserted into the sleeve, and FIG. 2 is the state where the pressing member is engaged. 3 is a perspective view of the suppressing member, and FIG. 4 is a sectional view showing the part pressed by the pressing member. Figure 5~
FIG. 7 relates to the manufacturing method of the second embodiment, FIG. 5 is a sectional view showing the nipple inserted into the sleeve, FIG. 6 is an enlarged sectional view of the main part showing the pressing member engaged,
FIG. 7 is an enlarged sectional view of the main part showing the part pressed by the pressing member. 8 to 10 relate to the conventional manufacturing method, FIG. 8 is a sectional view of the nipple, FIG. 9 is a sectional view of the sleeve, and FIG. 10 is a sectional view showing the nipple and sleeve crimped together. It is a diagram. 10.40172... Sleeve 20.50.71... Nipple 21.22.51.52... Ring-shaped groove 11.41.
...Peripheral end wall 30.60...Press member patent applicant
Toyoda Gosei Co., Ltd. Agent Patent Attorney Hirotoshi Okawa Patent Attorney Original Author Shudo Patent Attorney Akio Maruyama Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 7

Claims (2)

[Claims] (1) A groove forming step in which two ring-shaped grooves are formed in the outer surface of the cylindrical nipple in parallel with an interval in the axial direction of the nipple, and an inner diameter approximately corresponding to the outer diameter of the nipple is formed in one end surface. The nipple is inserted into a cylindrical sleeve having a center hole with an open end, and the peripheral end surface of the center hole is placed on the outer surface of the nipple held between the two ring-shaped grooves. a pair of pressing members are engaged with the two ring-shaped grooves;
a pressing step of pressing the side walls of the two ring-shaped grooves toward each other using a pair of pressing members, so that the outer surface of the nipple held between the two ring-shaped grooves bulges outward in the radial direction. A method for manufacturing a hose cap, characterized in that the sleeve and the nipple are integrally fastened by pressing the peripheral end surface of the center hole in the radial direction. (2) The two ring-shaped grooves are located on both sides of the peripheral end wall that forms the center hole of the sleeve, and the outer surface of the nipple held in the two ring-shaped grooves on both sides of the peripheral end wall is pressed by the pressing member. 2. The method of manufacturing a hose cap according to claim 1, wherein the protrusions are made to protrude in the radial direction, and these protrusions sandwich and hold the peripheral end wall.