JP2014117046A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for alignment by easily moving the small diameter cylindrical portion of a grommet being fitted over a metal pipe, into which a wire harness is inserted.SOLUTION: In a grommet molded of rubber or elastomer and having a small diameter cylindrical portion, being brought into tight contact with the outer peripheral surface of an exterior material including a metal pipe or an attached material consisting of a wire harness, and a large diameter cylindrical portion continuous to the small diameter cylindrical portion, pulling protrusions (10) are protruding from at least two positions on the outer peripheral surface of the small diameter cylindrical portion opposing in the diameter direction.

Description

  The present invention relates to a grommet, and more specifically, a small-diameter cylindrical portion of a grommet made of rubber or elastomer is attached to a metal pipe passing through a wire harness routed in a vehicle, and is attached to a through hole for a wire harness of a vehicle body panel. About grommets.

  Conventionally, in electric vehicles and hybrid vehicles, the wiring harness that is routed between the battery and the inverter, between the inverter and the motor, etc., contains a high-voltage electric wire that is a source of noise. In the underfloor wiring area, the metal pipe is often inserted to protect the wire harness and shield the high voltage electric wire. (See JP 2004-224156 A)

  The metal pipe sheathed on the wire harness is pulled out on the floor panel through a through hole provided in the floor panel on the rear side and connected to a battery or the like, and a grommet is sheathed on the metal pipe in advance through the through hole, A grommet is installed in the through-hole for water and dust protection. The grommet to be attached for sealing such as waterproof and dustproof is formed of a flexible elastic body made of rubber or elastomer, and has a small diameter cylinder for the grommet to be in close contact with a wire harness or a material to be attached made of a pipe material covering the wire harness. The part is set to be smaller than the outer diameter of the attached material, and the small-diameter cylindrical portion is expanded and opened with a jig so as to be in close contact with the outer peripheral surface of the attached material.

When a metal pipe sheathed on the underfloor wiring wire harness is passed through a through hole of a floor panel, it is necessary to move a grommet fitted on the metal pipe in order to accurately align the grommet to the position corresponding to the through hole. is there. Therefore, as shown in FIGS. 8A and 8B, the operator picks and pulls the small-diameter cylindrical portion 111 of the grommet 110 that is externally attached to the metal pipe 100 through which the wire harness W / H is inserted, with the required position. Is moved in the axial direction L.
However, since the small-diameter cylindrical portion 111 of the grommet is in close contact with the outer peripheral surface of the metal pipe 100, it is difficult to move the small-diameter cylindrical portion 111. In particular, it is very difficult and difficult to move the small-diameter cylindrical portion 111 toward the large-diameter cylindrical portion 112 in the direction opposite to the mounting direction. In addition, when the thin-walled small-diameter cylindrical portion 111 is partly strongly gripped and pulled, the gripped portion is deformed and bulges, and a gap V is generated between the portion and the metal pipe 100, which may cause water infiltration.

  Conventionally, as shown in FIG. 9 in Japanese Patent Application Laid-Open No. 2001-99359 (Patent Document 1), the applicant of the present invention has a protrusion 205 on the outer surface of the end surface 203 of the large diameter cylindrical portion 202 that is continuous with the small diameter cylindrical portion 201 of the grommet 200. Providing grommets with protrusions. The protrusion 205 is used to pull and align the large-diameter cylindrical portion 202 in order to accurately fit the vehicle body locking recess 206 provided on the outer peripheral surface of the large-diameter cylindrical portion 202 to the periphery of the through hole of the vehicle body panel. It is a protrusion.

JP 2001-99359 A

  As shown in FIG. 9, a grommet having a protrusion for correcting the catch of the seal lip by accurately aligning the vehicle body locking recess of the grommet with the through hole of the panel has been proposed. There is no grommet provided with a portion that can easily move the cylindrical portion, and the workability is very bad. When the small diameter cylindrical portion is grasped and forcibly pulled, there is a problem that the waterproof performance is lowered.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a grommet having a configuration in which an operator can easily move a small-diameter cylindrical portion of a grommet that is externally fitted and fixed to a material to be attached such as a metal pipe. Yes.

In order to solve the above problems, the present invention provides a small-diameter cylindrical portion that is molded from rubber or elastomer and is in close contact with an outer peripheral surface of a mounting material that includes a metal pipe and an exterior material or a wire harness, and is continuous with the small-diameter cylindrical portion. A grommet having a large-diameter cylindrical portion,
There is provided a grommet characterized in that pulling protrusions are provided in at least two locations facing the diameter direction of the outer peripheral surface of the small diameter cylindrical portion.

  In the grommet of the present invention, as described above, since the pair of pulling protrusions are provided on the outer peripheral surface of the small-diameter cylindrical portion, the operator grasps the pair of pulling protrusions with a finger. By pulling the pulling projection pieces in the opposite directions, it is possible to easily open a gap around the entire circumference between the small-diameter cylindrical part and the attached material, and then pull it in the required direction to move it smoothly. Can do. Therefore, the operator can easily perform a minute moving operation for alignment between the grommet and the through hole of the vehicle body panel.

The grommet of the present invention can be applied to any grommet that closely attaches the small-diameter cylindrical portion to the outer peripheral surface of the attached material, and an annular vehicle body locking recess provided on the outer peripheral surface of the large-diameter cylindrical portion is provided at the periphery of the through hole of the vehicle body panel. It may be an integral grommet to be attached or a two-piece grommet in which a resin inner is attached to a large-diameter cylindrical portion.
Further, the material to be attached to which the grommet of the present invention is attached may be a corrugated tube or a resin round tube exterior material in addition to the metal pipe exterior to the wire harness. But you can.

  The inner diameter of the small-diameter cylindrical portion of the grommet is 80% to 20% of the outer diameter of the material to be fitted, and a pair of slits are cut from the tip opening of the small-diameter cylindrical portion to a required dimension. It is preferable that a seal lip protrudes from the inner peripheral surface of the small-diameter cylindrical portion at a portion not provided, and the pulling protruding piece is provided on the outer peripheral surface of the protruding portion of the seal lip.

  The opening edge of the small-diameter cylindrical portion of the grommet has a tape-holding protrusion, and a pair of slits are provided extending from the opening tip in the axial direction, and a portion where the slit is provided is a tape winding portion. Therefore, the protruding portion of the pulling protruding piece does not get in the way when winding the tape. In addition, the pulling projecting piece protrudes from the outer peripheral surface of the portion provided with the seal lip on the inner peripheral surface, and the entire inner peripheral surface of the portion is not in close contact with the attached material. When pulled in a direction orthogonal to the axial direction of the small diameter cylindrical portion, the small diameter cylindrical portion is easily pulled away from the attached material.

  The pulling projecting piece projecting on the outer peripheral surface of the small-diameter cylindrical portion, the operator picks one pulling projecting piece with one hand, the other hand pulls the other pulling projecting piece, A pair of pulling protrusions are picked with both hands. However, since the position of the pair of pulling protrusions may be a position where it is difficult for the operator to pull in the attached state with respect to the material to be attached, four pulling protrusions may be provided at intervals of 90 degrees.

  It is preferable that the pair of pulling projecting pieces have a flat plate shape having a width extending in the circumferential direction of the small diameter cylindrical portion and a height protruding outward in the radial direction from the outer peripheral surface of the small diameter cylindrical portion. The size of the pulling projection piece is not limited as long as it can be grasped and picked by a finger with a finger, but the width is preferably in the range of 45 to 90 degrees in the circumferential direction.

  The grommet of the present invention is most effectively used when it is attached to the outer peripheral surface of a metal pipe that passes through a wire harness that is wired under the floor.

  As described above, since the grommet according to the present invention has a pair of pulling projection pieces on the small-diameter cylindrical portion, the operator grips and pulls the pulling projection piece to bring it into close contact with the outer peripheral surface of the attached material. The small diameter cylindrical portion can be easily moved. Therefore, it is possible to easily move the small-diameter cylindrical portion for alignment between the through hole of the panel and the locking portion of the grommet, thereby improving the workability and shortening the working time, thereby reducing the cost. Can do.

The grommet of embodiment of this invention is shown, (A) is a perspective view, (B) is a right view, (C) is sectional drawing. It is an expanded sectional view of the small diameter cylinder part of the part which provided the protrusion for a tension | pulling. (A) is explanatory drawing which shows the wiring location of the wire harness which attaches the said grommet, (B) is drawing which shows the through-hole of the vehicle body of the site | part which installs a grommet. It is a perspective view which shows the wire harness which attached the said grommet. (A) is principal part sectional drawing of FIG. 4, (B) is the partially expanded view of (A). The operation | work which picks and moves the protrusion for tension | pulling of the said grommet is shown, (A) is a front view, (B) is sectional drawing of an axial direction, (C) is sectional drawing of radial direction. It is drawing which shows other embodiment. (A) (B) is drawing which shows a prior art example. It is drawing which shows the other conventional grommet.

Hereinafter, embodiments of the grommet of the present invention will be described with reference to the drawings.
The grommet 1 of the embodiment shown in FIGS. 1 to 6 is an integrally molded product made of rubber or elastomer. As shown in FIG. 1, a large-diameter cylindrical portion 3 is continuously provided at one end of a small-diameter cylindrical portion 2, An annular vehicle body locking recess 4 is provided on the outer peripheral surface of the large-diameter cylindrical portion, and a seal lip 5 is provided on the side wall of the vehicle body locking recess 4.

  Two tape stop protrusions 2b are provided along the peripheral edge of the distal end opening 2a of the small diameter cylindrical part 2 in the direction opposite to the continuous side of the large diameter cylindrical part, and at two locations facing the diameter direction from the peripheral edge of the distal end opening. A pair of slits 2s extending in the axial direction is cut. A pair of symmetrical pulling protrusions 10 and 10 are provided on the outer peripheral surface 2c of the small-diameter cylindrical portion 2 at a position away from the back end 2e of the slit 2s in a position orthogonal to the slit 2s. An annular seal lip 2r protrudes from the inner peripheral surface of the small-diameter cylindrical portion 2 where the pulling protrusion 10 protrudes from the outer peripheral surface.

  As shown in FIG. 2, the pair of pulling projecting pieces 10 protrudes outward in the radial direction from the width (w) extending in the circumferential direction of the small diameter cylindrical portion 2 and from the outer peripheral surface of the small diameter cylindrical portion 2. It is a flat plate having a height (h). The pulling projecting piece 10 may be of a size that can be grasped and grasped by a worker with a finger, and the width (w) is preferably in the range of 45 to 90 degrees in the circumferential direction (θ). .

  As shown in FIG. 3A, the grommet 1 of the present embodiment is externally fitted to a material to be attached including a metal pipe 20 that passes through a wire harness W / H that is wired under the floor in an electric vehicle or a hybrid vehicle 50. It is attached to the through hole 22 provided in the floor panel 21. The small-diameter cylindrical portion 2 of the grommet 1 has a small diameter of 80 to 20% of the outer diameter of the pipe 20, and therefore, when attached to the wire harness, the small-diameter cylindrical portion 2 of the grommet 1 is expanded with a jig (not shown). Expanded and passed through the pipe 20. The expansion jig is removed after passing the small-diameter cylindrical portion 2 to the required position of the pipe 20, and the inner peripheral surface of the small-diameter cylindrical portion 2 is in close contact with the outer peripheral surface of the pipe 20.

In order to accurately align the vehicle body locking recess 4 of the grommet 1 with the through hole 22, it is necessary to move the grommet 1 relative to the pipe 20 in the axial direction and align it.
In this case, as shown in FIG. 6 (A), the operator holds the pair of pulling protrusions 10 protruding from the outer peripheral surface of the small-diameter cylindrical portion 2 in close contact with the outer peripheral surface of the pipe 20 with a finger. At that time, one hand picks the pulling projection piece 10 located on the upper side in the drawing, the other hand picks the pulling projection piece 10 located on the lower side in the drawing, and the upper and lower pulling projection pieces 10. 10 is pulled in the up and down directions C1 and C2 directions opposite to each other.
When the pulling protrusions 10 and 10 are pulled to C1 and C2, the inner peripheral surface of the small diameter cylindrical portion 2 is pulled away from the outer peripheral surface of the pipe 20 with a gap 30 as shown in FIGS. be able to.

Next, the upper and lower pulling protrusions 10, 10 are pulled in the alignment direction L 1 or L 2 and moved in the axial direction with respect to the pipe 2. Since the gap 30 is generated between the inner peripheral surface of the small diameter cylindrical portion 2 and the outer peripheral surface of the pipe 20, the movement can be performed without difficulty.
In this way, the operator can easily move the small-diameter cylindrical portion 2 with respect to the pipe 20 by grasping and pulling the pulling protrusions 10 and 10 with both hands, and the grommet 2 can pass through the fixing position of the grommet 2. It is possible to accurately match the position that can be aligned with the hole.

  Thereafter, the adhesive tape T shown in FIG. 3B is wound from the outer peripheral surface of the grommet 1 where the slit 2 s is provided to the outer peripheral surface of the pipe 20 to fix the grommet 1 to the outer peripheral surface of the pipe 20. doing.

  As described above, when the fixing position of the grommet 1 with respect to the pipe 20 is set to high accuracy, it is possible to easily perform the work of routing the wire harness in the automobile and fitting and fixing the grommet 1 to the through hole of the vehicle body panel.

  The grommet of the present invention is not limited to the above-described embodiment, and as shown in FIG. 7, the pulling projection piece 10 protruding from the small diameter cylindrical portion 2 has a trapezoidal shape with a reduced width dimension toward the outside, and the small diameter cylinder The dimension of the continuous part with the part 2 may be large. With this shape, the pulling projection piece 10 can be prevented from detaching from the small-diameter cylindrical portion 2, and the outer peripheral surface of the pipe 20 and the inner peripheral surface of the small-diameter cylindrical portion 2 when pulled in the direction of the outer C1 and C2. The circumferential length of the gap 30 generated between the surface and the surface can be increased.

  Furthermore, it is not limited to the grommet attached to a metal pipe, and when it attaches to a corrugated tube and a round tube, it is used suitably also when attaching to the wire harness which concentrated the electric wire group with the adhesive tape.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Small diameter cylindrical part 2s Slit 2r Seal lip 10 Pulling protrusion 20 Metal pipe 21 Floor panel 22 Through hole W / H Wire harness

Claims (4)

A grommet formed from rubber or elastomer, and having a small-diameter cylindrical portion that is in close contact with an outer peripheral surface of a mounting material including a metal pipe and an exterior material or a wire harness, and a large-diameter cylindrical portion continuous to the small-diameter cylindrical portion. ,
A grommet characterized in that pulling projecting pieces are provided in at least two locations facing each other in the diameter direction of the outer peripheral surface of the small-diameter cylindrical portion.   The inner diameter of the small-diameter cylindrical portion is 80% to 20% of the outer diameter of the attached material to be fitted, and a pair of slits are cut from the tip opening of the small-diameter cylindrical portion to a required dimension, and the slits are provided. The grommet according to claim 1, wherein a seal lip projects from an inner circumferential surface of a small-diameter cylindrical portion at an unexposed portion, and the pulling projecting piece is provided on an outer circumferential surface of the projecting portion of the seal lip.   The pair of pulling projection pieces are flat plate-like shapes having a width (w) extending in the circumferential direction of the small-diameter cylindrical portion and a height (h) projecting radially outward from the outer peripheral surface of the small-diameter cylindrical portion. The grommet according to claim 1 or 2, wherein the width (w) is in a range of 45 to 90 degrees in the circumferential direction.   The grommet according to any one of claims 1 to 3, wherein the grommet is attached to a metal pipe inserted through a wire harness that is wired under a floor of a vehicle.

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