JP5377124B2 - Grommet assembly and method for manufacturing grommet assembly - Google Patents

Description

  The present invention relates to a grommet assembly and a method for manufacturing the grommet assembly, and relates to, for example, providing a grommet on an electric wire or the like using a mold.

  FIG. 8 is a diagram showing a schematic configuration of a conventional grommet assembly 200, and FIG. 9 is a cross-sectional view of the conventional grommet assembly 200.

  Conventionally, in a grommet assembly 200 for preventing water from entering a vehicle, a grommet 204 is assembled to an electric wire (wire bundle) 202 and waterproofed.

  That is, the through hole 205 of the grommet 204 is expanded with a dedicated expansion jig, and the electric wire 202 is passed through the through hole 205 in this expanded state. After passing through the electric wire 202, the gap between the through hole 205 and the electric wire 202 is closed with the sealing material 206, thereby forming the waterproof grommet assembly 200.

  The grommet assembly 200 is used, for example, installed in a through hole of a vehicle body panel 208 of an automobile.

  As patent documents related to the conventional technology, for example, Patent Documents 1 to 4 can be listed.

Japanese Patent Laid-Open No. 7-29439 JP 2001-6467 A JP 2001-16748 A JP 2001-216844 A

  By the way, in the conventional grommet assembly 200, the process of expanding the through-hole 205 of the grommet 204 with a dedicated expansion jig is a hard work and is a heavy labor compared to other processes.

  The present invention has been made in view of the above problems, and provides a grommet assembly and a method for manufacturing the grommet assembly that can reduce the harshness of physical labor in the manufacturing process of the grommet assembly. Objective.

  The invention according to claim 1 is a wire having a predetermined length, an annular first restraining member provided on an outer periphery of the electric wire at an intermediate portion in a longitudinal direction of the electric wire, and a longitudinal direction of the electric wire. At another part in the middle of the direction, it is separated from the first restraining member, and contacts the annular second restraining member provided on the outer periphery of the electric wire and the electric wire existing between the restraining members. And the grommet assembly which has the grommet which covers the electric wire which exists between each said restraint member.

  According to a second aspect of the present invention, in the grommet assembly according to the first aspect, the electric wire located between the restraining members is curved.

  According to a third aspect of the present invention, an annular first restraining member is provided on the outer periphery of the electric wire at an intermediate portion in the longitudinal direction of the electric wire having a predetermined length, and another intermediate portion in the longitudinal direction of the electric wire. A restraining member installation step of providing an annular second restraining member on the outer periphery of the electric wire apart from the first restraining member, and after installing each restraining member on the electric wire in the restraining member installation step, A grommet forming step of forming a forming chamber in which an electric wire existing between the restraining members enters, filling the forming chamber with a material constituting the grommet, and solidifying the material after the filling to form the grommet; The manufacturing method of the grommet assembly which has this.

  According to a fourth aspect of the present invention, in the method for manufacturing a grommet assembly according to the third aspect, the grommet forming step comprises forming the grommet after bending the electric wire existing between the restraining members. This is a method for manufacturing a grommet assembly, which is a step of filling a material to be formed into the molding chamber.

  According to the present invention, it is possible to reduce the physical labor tightness in the grommet manufacturing process.

It is a figure which shows schematic structure of the grommet assembly which concerns on embodiment of this invention. It is sectional drawing of a grommet assembly. It is a figure explaining the manufacturing method of a grommet assembly. It is a figure explaining the manufacturing method of a grommet assembly. It is a figure explaining the manufacturing method of a grommet assembly. It is a figure explaining the manufacturing method of a grommet assembly. It is a figure explaining the manufacturing method of a grommet assembly. It is a figure which shows schematic structure of the conventional grommet assembly. It is sectional drawing of the conventional grommet assembly.

  FIG. 1 is a diagram showing a schematic configuration of a grommet assembly 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the grommet assembly 1.

  The grommet assembly 1 includes the electric wire 3 (the electric wire bundle 5) at an intermediate portion between the electric wire 3 or the electric wire bundle 5 having a predetermined length and the longitudinal direction of the electric wire 3 (the electric wire bundle 5) (left and right direction in FIGS. 1 and 2). The first restraining member 7 provided on the outer periphery of the wire 3 and the other part in the middle in the longitudinal direction of the electric wire 3 (the electric wire bundle 5) is separated from the first restricting member 7 and the electric wire 3 (the electric wire bundle 5). ) And an annular second constraining member 9 provided on the outer periphery, and a grommet 11.

  1 and 2 show the wire bundle 5 composed of a plurality of wires 3, but the grommet assembly 1 may be composed of only one wire 3. One electric wire 3 is configured so as to cover an insulating coating material such as a resin around a conducting wire. Moreover, the cross section by the plane orthogonal to this longitudinal direction is formed in the predetermined shape, for example, circular shape, etc. of the one electric wire 3. FIG.

  For example, the first restraining member 7 is provided so as to surround the wire bundle 5 in order to bundle the wire bundle 5. The first restraining member 7 is made of elastic rubber or the like, and is formed in an annular shape (cylindrical shape). The dimension of the first restraining member 7 in the axial direction (left and right direction in FIGS. 1 and 2) is smaller than the dimensions of the outer diameter and inner diameter of the first restraining member 7. Further, the thickness ((outer diameter−inner diameter) / 2) of the first restraining member 7 is sufficiently smaller than the inner diameter and the outer diameter of the first restraining member 7.

  In a state where no external force is applied to the first restraining member 7, the inner diameter of the first restraining member 7 is slightly smaller than the outer diameter of the wire bundle 5. In a state where the first restraining member 7 is installed in the wire bundle 5, the first restraining member 7 is elastically deformed, and the inner diameter of the first restraining member 7 becomes substantially equal to the outer diameter of the wire bundle 5, The wire bundle 5 is tightened by the restoring force of the restraining member 7. Thereby, in the site | part of the wire bundle 5 clamp | tightened with the 1st restraining member 7, the clearance gap between each electric wire 3 which comprises the wire bundle 5 becomes small compared with the other site | part of the wire bundle 5. FIG. Or when the grommet 11 is formed, the material of the grommet 11 is prevented from flowing out of the mold 13 (see FIG. 4 and the like).

  The second restraining member 9 is configured in the same manner as the first restraining member 7, and is installed in the wire bundle 5 in the same manner as the first restraining member 7.

  The grommet 11 is made of an elastic body such as rubber, and is provided between the restraining members 7 and 9 with an outer diameter larger than that of the restraining members 7 and 9.

  The grommet 11 is an electric wire existing between at least a part of the first restraining member 7 (site on the second restraining member 9 side in the longitudinal direction of the wire bundle 5) and the restraining members 7 and 9. The bundle 5 is in contact with at least a part of the second restraining member 9 (the part on the first restraining member 7 side in the longitudinal direction of the wire bundle 5), and a part of each restraining member 7, 9 and each restraint. The restraint members 7 and 9 and the wire bundle 5 are integrally provided so as to cover the wire bundle 5 existing between the members 7 and 9.

  More specifically, a grommet 11 is formed on a part of the surface of each restraining member 7, 9 and the entire surface of each wire 3 constituting the wire bundle 5 between each restraining member 7, 9. The material is in contact, so that the restraining members 7 and 9 and the grommet 11 cannot move relative to the wire bundle 5.

  Moreover, in the grommet assembly 1, each electric wire 3 which comprises the electric wire bundle 5 located between each restraining members 7 and 9 is curving so that each attitude | position and form may differ. For example, each electric wire 3 is curved into a shape such as a graph of a normal distribution function or a graph showing one cycle of a sine wave shape.

  The first restraining member 7 (second restraining member 9) is formed in a cylindrical shape as described above, and annular flanges 15 are provided at both ends in the axial direction. The outer diameter of the portion 15 is larger than the outer diameter of the intermediate portion (cylindrical intermediate portion) 17 in the axial direction of the first restraining member 7 (second restraining member 9).

  The grommet 11 is formed in a spheroid shape in which, for example, the rotation center axis coincides with the center axis C <b> 1 of the wire bundle 5. The grommet 11 has an outer diameter (the vertical dimension in FIG. 1) larger than the dimension in the extending direction (the horizontal direction in FIG. 1) of the rotation center axis C1. Further, an annular engagement groove 19 is provided on the outer periphery of the central portion of the grommet 11 in the axis C1 direction. By using this engagement groove 19, the grommet assembly 1 is, for example, a vehicle body panel 21 ( (See FIG. 2).

  One end of the grommet 11 in the direction of the axis C <b> 1 is located at the intermediate portion 17 of the first restraining member 7, and the other end of the grommet 11 in the direction of the axis C <b> 1 is of the second restraining member 9. It is located at the middle part 17. As a result, the grommet 11 comes into contact with and covers the part of the restraining members 7 and 9 and the wire bundle 5 existing between the restraining members 7 and 9.

  Next, a method for manufacturing the grommet assembly 1 will be described.

  First, the first restraining member 7 is provided on the outer periphery of the wire bundle 5 at the middle portion in the longitudinal direction of the wire bundle 5 having a predetermined length, and the first restraint member is disposed at the other portion in the middle of the wire bundle 5 in the longitudinal direction. A second restraining member 9 is provided on the outer periphery of the wire bundle 5 apart from the restraining member 7 (see FIG. 3).

  Subsequently, a molding chamber 23 in which a part of the first restraining member 7, the wire bundle 5 existing between the restraining members 7 and 9, and a part of the second restraining member 9 enters is formed. And a mold 13 such as a mold (see FIG. 4).

  Subsequently, after bending each wire 3 constituting the wire bundle 5 existing between the restraining members 7 and 9 (see FIG. 6), the material constituting the grommet 11 is formed in the molding chamber 23. After filling, the material is solidified (for example, the quick-drying material constituting the grommet 11 is filled, and after the filling, the material is dried and solidified) to form the grommet 11 (see FIG. 7). ). Thereafter, when the mold 13 is removed, the grommet assembly 1 is generated.

  The mold 13 is configured to be divided into two molds 13A and 13B at a dividing line (plane) L1 shown in FIG. 5 (viewed in the direction of arrow V in FIG. 4). Further, in order to form the molding chamber 23, each restraint member 7, 9 and a wire bundle 5 existing between the restraint members 7, 9 are installed in the mold 13. The members 7 and 9 are sandwiched between the molds 13 </ b> A and 13 </ b> B, and the electric wire bundle 5 in which the restraining members 7 and 9 are installed is installed integrally with the mold 13.

  Here, the process of bending each electric wire 3 of the electric wire bundle 5 will be described in detail.

  The bending of each electric wire 3 is, for example, in the state where the respective restraining members 7 and 9 are installed and the wire bundle 5 extends linearly, and the distance between the respective restraining members 7 and 9 is set to each restraining member for the electric wire bundle 5. The relative positions of 7 and 9 are made small without changing them, and the respective electric wires 3 constituting the electric wire bundle 5 extending between the respective restraining members 7 and 9 are bent. After this bending, the wire bundle 5 in which the respective restraining members 7 and 9 are installed is installed in the mold 13 to form the molding chamber 23, and the constituent material of the grommet 11 is filled in the molding chamber 23.

  Each electric wire 3 may be bent by another method. For example, in a state where the restraint members 7 and 9 are installed and the wire bundle 5 extends linearly, the wire bundle 5 on which the restraint members 7 and 9 are placed is placed in the mold 13 to form the molding chamber 23. Form. Thereafter, without changing the distance (positional relationship) between the restraining members 7 and 9, the electric wires 3 are pushed inward from the outside of the restraining members 7 and 9 in the longitudinal direction of the wire bundle 5 ( 6), by changing the relative position of the wire bundle 5 with respect to the restraining members 7 and 9, the wires 3 constituting the wire bundle 5 extending between the restraining members 7 and 9 are changed. It may be curved. Then, after this bending, the forming chamber 23 may be filled with the constituent material of the grommet 11.

  According to the grommet assembly 1, since the grommet 11 is formed and provided, it is not necessary to expand the through-hole of the grommet that is formed in the conventional manner, and in the manufacturing process of the grommet assembly 1. The physical labor can be reduced.

  Further, according to the grommet assembly 1, since the grommet 11 is formed and provided in the wire bundle 5, there is no need to separately provide a sealing material as in the prior art, and the manufacturing process of the grommet assembly 1 is simplified. In addition, since the grommet 11 is in close contact with each wire 3 of the wire bundle 5, the confidentiality of the grommet assembly 1 is improved.

  Further, according to the grommet assembly 1, the electric wire 3 existing between the restraining members 7 and 9 is curved, and the grommet 11 is provided at the curved portion. The grommet 11 in the grommet assembly 1 can be reliably prevented from being displaced (positional displacement with respect to the wire bundle 5).

DESCRIPTION OF SYMBOLS 1 Grommet assembly 3 Electric wire 5 Electric wire bundle 7 1st restraint member 9 2nd restraint member 11 Grommet 13 Type | mold 23 Molding chamber

Claims (4)

A predetermined length of wire;
An annular first restraining member provided on an outer periphery of the electric wire at an intermediate portion in the longitudinal direction of the electric wire;
An annular second restraining member provided on the outer periphery of the electric wire, away from the first restraining member, at another portion in the middle in the longitudinal direction of the electric wire;
A grommet that is in contact with the electric wires existing between the respective restraining members and covers the electric wires existing between the respective restricting members;
A grommet assembly comprising: The grommet assembly according to claim 1,
A grommet assembly, wherein an electric wire located between the restraining members is curved. An annular first restraining member is provided on the outer periphery of the electric wire at an intermediate portion in the longitudinal direction of the electric wire having a predetermined length, and the first restraining member is provided at another portion in the middle of the electric wire in the longitudinal direction. A restraining member installation step of providing an annular second restraining member on the outer periphery of the electric wire apart from the wire;
After the respective restraining members are installed on the electric wires in the restraining member installing step, a molding chamber is formed in which the electric wires existing between the respective restraining members enter, and the material constituting the grommet is filled in the molding chamber. A grommet forming step of solidifying the material after the filling to form a grommet;
A method for manufacturing a grommet assembly, comprising: In the manufacturing method of the grommet assembly according to claim 3,
The grommet forming step is a step of bending a wire existing between the respective restraining members and then filling a material constituting the grommet into the molding chamber. .

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