JP3767754B2 - Method for manufacturing hose intermediate holding structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method of manufacturing a hose intermediate holding structure used for wiring a brake hose in a tire house.
[0002]
[Prior art]
When assembling a brake hose or the like to the vehicle body, it is necessary not only to assemble both ends, but also to hold the intermediate portion of the vehicle body to prevent interference with other parts such as tires. Therefore, various intermediate holders are used to hold the intermediate part of the hose and enable attachment to other parts.
[0003]
For example, as shown in FIG. 7, a metal intermediate holder made of a plate-like flange portion 100 having a bolt hole 101 and a sleeve 102 extending from the flange portion 100 is known. The intermediate holder is fixed by sandwiching the hose 300 between the sleeve 102 and the nipple by crimping the sleeve 102 at a position of a nipple (not shown) inserted into the hose 300. Then, the bolt 200 is inserted into the bolt hole 101 and is used by being fixed by the nut 201 through the bolt hole 301 of the bracket 300 protruding from the vehicle body.
[0004]
By the way, as a vehicle speed sensor for detecting the vehicle speed of an automobile, an ABS speed sensor is generally used. The ABS speed sensor is fixed in the vicinity of the wheel, and a harness extending from the ABS speed sensor extends from the tire housing into the engine room along the brake hose. Further, in recent years, harnesses such as a pad wear sensor for detecting the wear amount of the brake pad are also arranged near the brake hose.
[0005]
The harness is routed separately from the brake hose in order to prevent interference with the brake hose, and is held by a bracket or the like that protrudes from the vehicle body using an intermediate holder in the same manner as the brake hose.
[0006]
[Problems to be solved by the invention]
However, if the hose and the harness are separately arranged as described above, the number of parts such as brackets, intermediate holders, bolts and nuts becomes large, and the number of assembling steps becomes large, which causes a problem in terms of cost. Further, since the conventional intermediate holder is made of metal, it is necessary to take rust prevention measures, and the weight is increased correspondingly, so that weight reduction is desired.
[0007]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a lightweight intermediate holding structure that can hold a hose in an intermediate position with a small number of parts and can also be integrally held with a harness or the like. .
[0008]
[Means for Solving the Problems]
The method of manufacturing the hose intermediate holding structure of the present invention that solves the above-described problem is that a hose with a nipple inserted in the intermediate part is placed in a mold, and a resin cylindrical part having a fixing part is formed by injection molding. It is a manufacturing method of a hose intermediate holding structure that is formed on the outer periphery and holds the hose on the attached portion via the fixed portion,
A pair of ring-shaped recesses are formed by compressing the positions in the vicinity of both ends of the hose portion of the hose with the mold, and a pair of ring-shaped recesses that bite into the outer peripheral surface of the hose from a part of the recesses during injection molding. In addition to forming one convex portion, a pair of ring-shaped second convex portions are formed on the inner peripheral side of the hose at a position corresponding to the first convex portion, and the cylindrical portion is axially relative to the hose by the first convex portion. The movement is restricted, and the nipple is disposed between the pair of second protrusions, and the relative movement in the axial direction with respect to the hose is restricted.
[0009]
[Action]
In the hose intermediate holding structure obtained in the present invention , the cylindrical portion is made of resin and is formed on the outer periphery of the hose by molding. Therefore, due to the shrinkage caused by cooling after molding, the cylindrical portion is reduced in diameter from the cavity shape of the mold, and is pressed against the outer peripheral surface of the hose and fixed to the hose. Therefore, a sleeve like a conventional metal intermediate holding structure is added. A tightening process becomes unnecessary.
[0010]
At the same time as the cylindrical portion is formed, the fixed portion can be formed from resin, and the shape thereof can be freely selected according to the shape of the attached portion. Therefore, the number of parts can be reduced as compared with the conventional case, and it is easy to reduce the number of mounting steps to the mounted portion.
Furthermore, if the harness holding part is formed integrally when the cylinder part is formed, the intermediate intermediate holding of the hose and the harness is also possible, and the harness and the hose can be brought close to each other and arranged in parallel.
[0011]
Moreover , in the hose intermediate | middle holding structure obtained by this invention, it has a pair of ring-shaped 1st convex part in the outer peripheral surface of a cylinder part, and the 1st convex part has digged into the hose outer peripheral surface. Therefore, the axial relative movement of the tube portion with respect to the hose is restricted. On the other hand, a pair of ring-shaped second convex portions are formed on the inner peripheral surface of the hose due to the presence of the first convex portions, and a nipple is disposed between the pair of second convex portions. Therefore, the relative movement of the nipple in the axial direction with respect to the hose is restricted by the second convex portion.
[0012]
Therefore, in the hose intermediate holding structure obtained by the present invention , even if the compression force of the hose by the cylindrical portion at the time of molding is increased, the hose can be prevented from collapsing due to the presence of the nipple, thereby further increasing the bonding strength with the hose. Is possible.
[0013]
【Example】
Hereinafter, the present invention will be specifically described with reference examples and examples.
( Reference Example 1 )
FIG. 1 and FIG. 2 show the hose intermediate holding structure manufactured in the reference example . This intermediate hose holding structure is composed of a brake hose 1, a cylinder 2 fixed to the brake hose 1, a flange 3 and a nut 4.
[0014]
The cylindrical body 2 includes a cylindrical portion 20 and a screw portion (fixed portion) 21. The cylindrical portion 20 and the screw portion 21 are integrally formed from a thermoplastic resin. Large diameter portions 22 are formed at both ends of the cylindrical portion 20.
The inner peripheral surfaces of the cylindrical portion 20 and the screw portion 21 are joined to the brake hose 1 by being pressed against the outer peripheral surface of the brake hose 1. In this hose intermediate holding structure, the cylinder 2 is formed by injection molding with the brake hose 1 placed in a mold, and the cylinder 2 is formed on the outer periphery of the brake hose 1 by the injection pressure at the time of molding and the contraction force at the time of cooling and solidification. It is pressed against the surface.
[0015]
In this hose intermediate holding structure, the screw portion 21 is inserted into the hose hole 30 of the bracket 3 extending from the vehicle body, and the large diameter portion 22 is larger than the diameter of the hose hole 30, so that the bracket 3 is in contact with the large diameter portion 22. The insertion length is regulated. Then, the resin nut 4 is screwed into the screw portion 21 from the opposite side, whereby the bracket 3 is sandwiched between the nut 4 and the end face of the large diameter portion 22, the cylinder 2 is fixed to the bracket 3, and the brake hose 1 is intermediate. Retained.
[0016]
Therefore, according to the hose intermediate holding structure obtained in this reference example , the conventional sleeve and bolt are unnecessary, and the sleeve caulking process is also unnecessary, so the number of parts and man-hours can be reduced and the weight can be reduced. Can do.
( Reference Example 2 )
FIG. 3 shows the hose intermediate holding structure manufactured in the second reference example . This intermediate hose holding structure has the same configuration as that of Reference Example 1 except that the cylindrical body 2 has the harness holding portion 23.
[0017]
The harness holding portion 23 includes a leg portion 24 protruding radially outward from the cylindrical portion 20 and a holding portion 26 having a substantially C-shaped cross section formed at the distal end of the leg portion 24 and having a slit-like opening 25. The harness 5 is inserted through the portion 26. The harness holding portion 23 is integrally formed at the same time as the cylindrical body 2 is formed.
In the hose intermediate holding structure of the present embodiment, the harness 5 can be fitted into the holding portion 26 from the opening 25 of the holding portion 26 even after being fixed to the bracket 3, and the workability is excellent.
[0018]
Therefore, according to the hose intermediate holding structure obtained in the present reference example , the harness 5 can be held intermediately close to the brake hose 1, and parallel wiring can be easily performed even if the number of parts is reduced.
( Reference Example 3 )
FIG. 4 shows the hose intermediate holding structure manufactured in the third reference example . In this hose intermediate holding structure, the bent hose 10, the bent cylindrical portion 60, the plate-like bracket portion (fixed portion) 61 that protrudes radially outward from the cylindrical portion 60, and the bracket portion 61 are fixed. It consists of a bracket (not shown), and the cylindrical portion 60 and the bracket portion 61 are integrally formed from a thermoplastic resin. The tubular hose 10 is inserted into the tubular portion 60, and the tubular portion 60 is pressed against and fixed to the curved hose 10.
[0019]
In this hose intermediate holding structure, the bent portion of the bent hose 10 is disposed in a mold, and the cylindrical portion 60 and the bracket portion 61 are integrally formed by injection molding, and the injection pressure during molding and the contraction during cooling and solidification. The cylindrical portion 60 is bent by the force and pressed against the outer peripheral surface of the hose 10.
In this hose intermediate holding structure, a bent portion of the bent hose 10 is held in the middle by being fixed to a bracket (not shown) extending from the vehicle body via a bolt hole 62 formed in the bracket portion 61 with a bolt and a nut.
[0020]
Therefore, according to the hose intermediate holding structure obtained in the present reference example , intermediate holding of the bent portion of the bent hose, which has been difficult in the past, is possible, and the degree of freedom of the intermediate holding position is improved.
( Example 1 )
FIG. 5 shows a hose intermediate holding structure manufactured in one embodiment of the present invention. The hose intermediate holding structure includes the brake hose 1, the cylinder part 70, a bracket part (fixed part) that does not appear in the figure, a metal nipple 8, and a bracket (not shown) to which the bracket part is fixed. Ring-shaped first convex portions 71 are formed at both ends of 70 so as to protrude radially inward and bite into the outer peripheral surface of the brake hose 1. Therefore, when the first convex portion 71 bites into the outer peripheral surface of the brake hose 1, the axial movement of the cylindrical portion 70 is restricted with respect to the brake hose 1.
[0021]
In addition, a pair of ring-shaped second convex portions 11 are formed on the inner peripheral surface of the brake hose 1 at positions pressed by the first convex portions 71 in the vicinity of both ends of the nipple 8. The height of the second convex portion 11 substantially corresponds to the thickness of the nipple 8, and the end surface of the nipple 8 abuts against the second convex portion 11, so that the relative movement in the axial direction with respect to the brake hose 1 is restricted.
[0022]
In order to manufacture the cylinder portion 70 having the hose intermediate holding structure, first, the nipple 8 is inserted into a predetermined position of the brake hose 1. Next, as shown in FIG. 6, the nipple 8 arrangement portion of the brake hose 1 is arranged in the mold 9 to perform mold clamping. At this time, in order to seal the cavity 90, the mold 9 has a pair of ring-shaped portions 91 located on the outer sides in the vicinity of both ends of the nipple 8, and the ring-shaped portion 91 makes the outer surface of the brake hose 1 ring-shaped. Pressing. Accordingly, a ring-shaped recess 12 is formed on the outer peripheral surface of the brake hose 1 pressed by the ring-shaped portion 91, and a part of the recess 12 is exposed in the cavity 90 due to the elasticity of the brake hose 1.
[0023]
By injecting the molten resin into the cavity 90 in this state, ring-shaped first convex portions 71 are formed at both ends of the molded cylindrical portion 70 by a part of the concave portion 12 exposed in the cavity 90. . Therefore, the 1st convex part 71 can be formed, without adding a hand to a metal mold | die structure.
In this embodiment, since the cylindrical portion 70 and the bracket portion (not shown) are injection-molded in the presence of the nipple 8, the brake hose 1 is prevented from being crushed by the nipple 8, so that the nipple 8 is not present. The injection pressure can be increased. Therefore, the force with which the cylinder part 70 compresses the brake hose 1 is increased, and the coupling strength between the cylinder part 70 and the brake hose 1 is further improved.
[0024]
【The invention's effect】
That is, according to the hose intermediate holding structure manufactured in the present invention , since at least the cylindrical portion is formed of resin, the weight can be greatly reduced as compared with the conventional metal. The number of parts such as bolts can be reduced by selecting the shape of the fixed part, and the number of parts for holding the harness can be reduced by integrally forming the harness holding part, thereby reducing costs. Is possible.
[0025]
Furthermore, it becomes possible to hold the bent portion of the bent hose, which has been difficult in the past, and the degree of freedom of the holding position is improved.
Moreover , the coupling strength between the tube portion of the hose intermediate holding structure and the hose can be further increased, and relative movement in the axial direction of the tube portion and the nipple relative to the hose can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a hose intermediate holding structure manufactured in Reference Example 1. FIG.
2 is a cross-sectional view of a hose intermediate holding structure manufactured in Reference Example 1. FIG.
3 is a perspective view showing a configuration of a hose intermediate holding structure manufactured in Reference Example 2. FIG.
4 is a cross-sectional view of a main part of a hose intermediate holding structure manufactured in Reference Example 3. FIG.
FIG. 5 is a cross-sectional view of a main part of a hose intermediate holding structure manufactured in an embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a method for manufacturing a cylindrical portion in one embodiment of the present invention.
FIG. 7 is a perspective view showing a configuration of a conventional hose intermediate holding structure.
[Explanation of symbols]
1: Brake hose 2: Cylinder 3: Bracket 4: Nut 5: Harness 10: Bending hose 20: Cylinder 21: Screw (fixed)

Claims (1)

A hose with a nipple inserted in the middle is placed in the mold, and a resin cylinder with a fixed part is formed on the outer periphery of the hose by injection molding, and the hose is covered via the fixed part. A manufacturing method of a hose intermediate holding structure to be held in a mounting part,
A pair of ring-shaped recesses are formed by compressing the positions in the vicinity of both ends of the cylindrical portion of the hose with the mold, and a pair of ring-shaped bits that bite into the outer peripheral surface of the hose from a part of the recesses during injection molding. A first convex portion is formed, and a pair of ring-shaped second convex portions are formed on the inner peripheral side of the hose at a position corresponding to the first convex portion, and the cylindrical portion is formed by the first convex portion. The hose intermediate holding structure is characterized in that the relative movement in the axial direction with respect to the hose is restricted, and the nipple is disposed between the pair of second convex portions, and the relative movement in the axial direction with respect to the hose is restricted. Production method.

Images