JPH022034B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a hose cap, and the manufacturing method of the present invention is applicable to hoses that carry medium-high pressure fluids such as hoses that lead hydraulic pressure to power steering of automobiles, air conditioner hoses, and brake hoses. Available for flowing hose caps.

[Prior Art] Conventionally, in order to manufacture a cap for a power steering hose, for example, a ring-shaped engagement groove 73 is formed on the surface of a nipple 71 by rolling or cutting, as shown in FIGS. 8 to 10. , its engagement groove 73
A peripheral end wall 74 forming the center of the sleeve 72 is pressed into engagement with the sleeve 72 . In the thus obtained cap, the engagement groove 73 is intended to prevent relative movement of the sleeve 72 and 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 engagement groove of the nipple, 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-mentioned 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 includes groove formation in which two ring-shaped grooves are formed in the outer surface of a cylindrical nipple in parallel with an interval in the axial direction of the nipple. The nipple is inserted into a cylindrical sleeve that has a center hole on one end surface with a diameter approximately corresponding to the outer diameter of the nipple and the other end surface is open, and the peripheral end surface of the center hole is an insertion step of positioning the nipple on the outer surface of the nipple held in the two ring-shaped grooves, and engaging a pair of pressing members with the two ring-shaped grooves, and engaging the pair of pressing members with the two ring-shaped grooves; a pressing step of pressing the side walls of the ring-shaped grooves toward each other, the outer surface of the nipple sandwiched between the two ring-shaped grooves bulges outward in the radial direction, and the circumferential end surface of the center hole The sleeve and the nipple are integrally fastened by pressing 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, and preferably the outer diameter of the nipple should be slightly larger than the inner diameter of the hose to prevent liquid from easily leaking from the contact surface between the hose and the 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 an opening. 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 to be described later, thereby forming 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 pinched and crimped between the inside surface of the sleeve and the outside surface of the nipple. Ru. This integrates the cap and the hose. The nipples and sleeves mentioned above can be of almost the same shape as conventional ones, and the materials of the nipples and sleeves can be made of various metals such as mild steel, aluminum, copper, etc. depending on the purpose, regardless of whether they are the same or different materials. You can choose. Further, the thickness of the peripheral end wall forming the center hole does not need to match the width of the engagement groove as in the conventional case, and high precision is not required.

The groove forming step is a step of forming two ring-shaped grooves, each of which goes around the nipple in the circumferential direction, 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 way as before.
Precision is not required as much as before.

The insertion step is a step 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 held between the two ring-shaped grooves. In this case, the two ring-shaped grooves may be positioned such 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 located 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.

This insertion step does not require highly accurate positioning as in the past. 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 in such a position.

In the pressing process, the side walls of the two ring-shaped grooves are
This is a step of pressing 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, which is sandwiched between the two ring-shaped grooves, expands mainly radially outward and presses against the peripheral end surface of the center hole of the sleeve. This allows the nipple and sleeve to be 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. It swells as if pressing down, and if you keep pressing it further,
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 nipple-to-sleeve fastening portion, further increasing the fastening 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 central hole at one end with a diameter approximately equivalent to the outer diameter of the nipple at the bottom of the ring-shaped groove. Can be done.

[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 the 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 precision of the nipple and sleeve before fastening is not required as much as in the past, and the manufacture of each is simplified. Further, the ring-shaped groove provided in the nipple is for engaging the pressing member and transmitting the pressing force. Therefore, the width and depth require almost no precision compared to conventional engagement grooves. Furthermore, the precision of positioning the nipple and sleeve is not required as much as in the past. 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. Productivity is therefore 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. Further, since the sleeve is not crimped, 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, two ring-shaped grooves 2 are formed on the surface of the nipple 20 made of mild steel by rolling.
1,22 were formed. The distance between the ring-shaped groove 21 and the ring-shaped groove 22 is set to be 60% longer than the thickness of the peripheral end wall 11 forming the center hole of the sleeve 10. Then, as shown in FIG. 1, the nipple 20 was inserted into the sleeve 10 so that the peripheral end surface 12 of the center hole of the sleeve made of mild steel was located between the two ring-shaped grooves 21 and 22. Thereafter, as shown in FIG.
a, 31a 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 kg/mm ² so as to be close to each other. As a result, the ring-shaped groove 21 on the surface of the nipple 20,
The portion sandwiched by 22 bulged outward in the radial direction as shown in FIG. 4, and was pressed against the peripheral end surface 12 of the sleeve 10. When the pressing was continued further, protrusions 23 and 24 were formed on both sides of the peripheral end wall 11, and the peripheral end wall 11 was sandwiched and pressed by the pressing members 30 and 31. In the obtained hose cap, the sleeve 10 and nipple 20 were integrally and reliably fastened. Also, 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 sleeve and nipple are the same as in the first embodiment, except that the distance between the two ring-shaped grooves 51 and 52 formed in the nipple 50 is slightly smaller than the thickness of the peripheral end wall 41 of the sleeve 40. was used. and the first
As in the embodiment, the nipple 50 is inserted into the sleeve 40, and the peripheral end wall 41 of the sleeve 40 is inserted into the ring-shaped groove 5.
It was located between 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, the portion sandwiched between the two ring-shaped grooves 51 and 52 bulged outward in the radial direction and pressed against the peripheral end surface 42 of the sleeve 40, as shown in FIG. As a result, the nipple 50 and the sleeve 40 were integrally fastened.

[Brief explanation of drawings]

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 a sectional view showing the state where the pressing member is engaged. FIG. 3 is a perspective view of the pressing member, and FIG. 4 is a sectional view showing the area pressed by the pressing member. Figures 5 to 7 are
Regarding the manufacturing method of the 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, and FIG. 7 is the pressing member FIG. 3 is an enlarged cross-sectional view of the main part showing the pressed area. 8 to 10 relate to a conventional manufacturing method, in which 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 of the sleeve.
The figure is a sectional view showing the nipple and sleeve crimped together. 10, 40, 72...sleeve, 20, 50,
71...nipple, 21, 22, 51, 52...
Ring-shaped groove, 11, 41... Peripheral end wall, 30, 60
...Press member.

Claims (1)

[Claims] 1. A groove forming step of forming two ring-shaped grooves arranged parallel to each other at intervals in the axial direction of the nipple on the outer surface of the cylindrical nipple; The nipple is inserted into a cylindrical sleeve that has a center hole with a corresponding inner diameter and the other end is open, and the peripheral end surface of the center hole is inserted into the nipple held between the two ring-shaped grooves. an insertion step of positioning on the outer surface, engaging a pair of pressing members with the two ring-shaped grooves, and pressing the side walls of the two ring-shaped grooves toward each other with the pair of pressing members; The outer surface of the nipple sandwiched between the two ring-shaped grooves is bulged radially outward and the peripheral end surface of the center hole is pressed radially, thereby causing the sleeve and the nipple to bulge outward in the radial direction. A method for manufacturing a hose cap characterized by integrally fastening a nipple. 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 so that the diameter of the nipple is 2. The method of manufacturing a hose cap according to claim 1, wherein the hose cap is made to protrude in the direction and the peripheral end wall is held between the protrusions.