JP3606083B2 - How to attach the grommet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for attaching a grommet, and more specifically, it enables precise adjustment to a required reference position by enabling fine adjustment of the attachment position when attaching the grommet to the outer periphery of the wire harness.
[0002]
[Prior art]
Generally, when wiring an automotive wire harness from the indoor side to the engine room side, the wire harness is inserted into a rubber grommet that connects the cylindrical small-diameter cylinder part and the large-diameter cylinder part, and in this state the vehicle body panel A grommet is fitted into the through hole of the slab to achieve waterproofing and sound insulation. Accordingly, the wire harness divided into the indoor side and the engine room side is set to a required length with the grommet mounting position as a boundary. For this reason, it is necessary to mount the grommet accurately at a required mounting reference position.
[0003]
[Problems to be solved by the invention]
In order to attach the grommet to the wire harness, an expanding jig is inserted into the small diameter cylindrical portion, and the wire harness is sequentially inserted in a state where the small diameter cylindrical portion is expanded. Then, when the mounting reference position is reached, the expansion jig is closed, and the grommet is mounted on the outer periphery of the wire harness by being pulled out from the small-diameter cylindrical portion and fixed with tape. However, when pulling out the expansion jig from the small-diameter cylindrical portion, the grommet may be dragged and shifted from the mounting reference position. The small-diameter cylindrical part of the grommet is elastically adhered to the outer periphery of the wire harness and has a large frictional resistance because it is made of rubber. Therefore, it is extremely difficult and troublesome to pull the grommet and correct the misalignment. It was.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for accurately positioning and mounting a grommet at a mounting reference position on the outer periphery of a wire harness.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a rubber grommet having a large-diameter cylindrical portion fitted in a through hole of a vehicle body panel and a small-diameter cylindrical portion closely attached to the outer periphery of the wire harness. Is mounted at a required position on the outer periphery of the wire harness, and at least two slits are formed in the axial direction at the tip of the small-diameter cylindrical portion to form a pair of gripping pieces that can be rolled up. ,
Wrap a tape as a mark around the required position of the outer circumference of the wire harness to which the grommet should be mounted, and set it as the mounting reference position.
Next, the small-diameter cylindrical portion of the grommet is expanded with an expansion jig, the wire harness is inserted along the axial direction, and the expansion jig is inserted when the mounting reference position reaches the end of the small-diameter cylindrical portion. Pull out and close the small diameter cylinder as a temporary mounting position,
After that, the pair of gripping pieces of the small-diameter cylindrical part is picked up in the opposite directions around the wire harness, and at the same time, by pulling in the direction of the mounting reference position, the small-diameter cylindrical part is brought into the mounting reference position. A grommet mounting method is provided in which a grommet is moved until it matches and is positioned at a required position of a wire harness.
[0006]
According to the above method, since the pair of gripping pieces are rolled up in opposite directions, the small-diameter cylindrical portion expands to reduce the contact area with the outer periphery of the wire harness, and the friction with the outer periphery of the wire harness. Resistance can be reduced. For this reason, the grommet can be easily moved by pulling the gripping piece, and fine adjustment work for positioning to the mounting reference position can be performed without difficulty.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a grommet 1 to be attached to a wire harness W / H. The grommet 1 is made of rubber, and has a cylindrical small-diameter cylindrical portion 2 and a large-diameter large diameter continuous to one end of the small-diameter cylindrical portion 2. The small diameter cylindrical portion 2 is provided as a wire insertion portion 2a. The large-diameter cylindrical portion 3 has an annular recess groove 3a that engages with a through hole of a vehicle body panel (not shown) that divides, for example, an engine room and an interior of an automobile.
[0008]
The inner diameter of the wire insertion portion 2a is set to be smaller than the outer diameter of the wire harness W / H to be attached, and the wire insertion portion 2a is in close contact with the outer periphery of the wire harness W / H in an elastic state. Yes.
[0009]
A ridge 2b is provided at a position approximately 10 mm inside from the tip of the small-diameter cylindrical portion 2, and two slits 2c are formed in the axial direction from the tip of the small-diameter cylindrical portion 2 to a position before the ridge 2b. A pair of gripping pieces 2d and 2e that can be lifted outward from the slit 2c are formed. The cut base portion of the slit 2c is subjected to an R process in which corners are removed in order to prevent tearing when the gripping pieces 2d and 2e are rolled up. Furthermore, a groove 2f is provided in a position adjacent to the front end side of the ridge 2b to facilitate the raising operation of the grip pieces 2d and 2e.
[0010]
Next, a method for mounting the grommet 1 having the above configuration to the outer periphery of the wire harness W / H will be described. First, as shown in FIG. 2A, the outer periphery of the wire harness W / H to which the grommet 1 is to be mounted is required. A tape T as a mark is wound around the position as a mounting reference position P. Note that the tape T uses a different color from the shape fixing tape Ta wound spirally around the outer periphery in order to maintain the shape of the wire harness W / H, thereby recognizing the mounting reference position P. It is easy. Next, an expansion jig 4 having claw pieces that open and close radially is inserted into the small diameter cylindrical portion 2 of the grommet 1 so that the small diameter cylindrical portion 2 is expanded to have a larger diameter than the outer diameter of the wire harness W / H. To do. From this state, the wire harness W / H is inserted into the electric wire insertion portion 2a of the small-diameter cylindrical portion 2 along the axial direction, and is expanded when the mounting reference position P reaches a position in front of the small-diameter cylindrical portion 2. The jig 4 is pulled out to close the small-diameter cylindrical portion 2, and the grommet 1 is temporarily attached to the outer periphery of the wire harness W / H as shown in FIG. In this state, it is not easy to shift the grommet 1 in the axial direction due to the characteristics of the rubber material in which the small-diameter cylindrical portion 2 is in an elastic contact state and has a large frictional force.
[0011]
For this reason, as shown in FIG. 3 (A), the pair of gripping pieces 2d and 2e of the small-diameter cylindrical portion 2 are picked up in opposite directions around the wire harness W / H with both hands, Pulling is performed in the direction of the mounting reference position P. Then, the small-diameter cylindrical portion 2 that has elastically adhered to the outer periphery of the wire harness W / H has a reduced contact range with the outer periphery of the wire harness W / H following the gripping pieces 2d and 2e being rolled. This reduces the frictional resistance. Therefore, the grommet 1 easily follows following the pulling operation in the mounting reference position P direction, and the base of the slit 2c matches the end of the mounting reference position P as shown in FIG. Recognizing that the point of time is a normal mounting position, the hand is released from the gripping pieces 2d and 2e.
[0012]
By the above mounting operation, as shown in FIG. 4A, the grommet 1 is positioned at a required mounting position and is brought into close contact with the outer periphery of the wire harness W / H by the elasticity of the small diameter cylindrical portion 2. Next, as shown in FIG. 4B, the tape Tb is wound from the outer periphery of the small-diameter cylindrical portion 2 to securely fix the grommet 1 to the wire harness W / H. At this time, the deviation of the tape T is prevented by the convex 2b provided around the small-diameter cylindrical portion 2.
[0013]
In the above-described embodiment, the case where the end where the base of the slit 2c of the small diameter cylindrical portion 2 matches the end of the tape T at the mounting reference position P has been described as a regular mounting position. It is possible to arbitrarily set which part of the cylindrical portion 2 matches the point that is the normal position.
[0014]
【The invention's effect】
As is clear from the above description, in the grommet mounting method of the present invention, the grommet once mounted at the temporary position is pulled up so that the gripping piece formed at the tip of the small diameter cylindrical portion is lifted to the mounting reference position. Since it is made to agree | coincide, the mounting position adjustment of a grommet can be operated smoothly. Therefore, the accuracy of the mounting position of the grommet can be improved and the efficiency of the mounting work can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a grommet used in a grommet mounting method of the present invention.
2A is a cross-sectional view of a step of expanding a grommet and inserting a wire harness, and FIG. 2B is a cross-sectional view showing a state where the grommet is mounted at a temporary position.
FIGS. 3A and 3B are views showing an adjustment work state of a grommet mounting position. FIGS.
FIG. 4A is a view showing a state where a grommet is mounted at a normal position, and FIG. 4B is a view showing a state where the grommet is fixed to the outer periphery of the wire harness with a tape.
[Explanation of symbols]
W / H Wire harness P Mounting reference position 1 Grommet 2 Small diameter cylindrical portion 2a Electric wire insertion portion 2c Slit 2d, 2e Holding piece 3 Large diameter cylindrical portion 4 Expansion jig

Claims (1)

A method of attaching a rubber grommet having a large-diameter cylindrical portion fitted into a through-hole of a vehicle body panel and a small-diameter cylindrical portion closely attached to the outer periphery of the wire harness to a required position on the outer periphery of the wire harness,
A pair of gripping pieces that can be rolled up by forming at least two slits in the axial direction at the tip of the small-diameter cylindrical portion are formed,
Wrap a tape as a mark around the required position of the outer circumference of the wire harness to which the grommet should be mounted, and set it as the mounting reference position.
Next, the small-diameter cylindrical portion of the grommet is expanded with an expansion jig, the wire harness is inserted along the axial direction, and the expansion jig is inserted when the mounting reference position reaches the end of the small-diameter cylindrical portion. Pull out and close the small diameter cylinder as a temporary mounting position,
After that, the pair of gripping pieces of the small-diameter cylindrical part is picked up in the opposite directions around the wire harness, and at the same time, by pulling in the direction of the mounting reference position, the small-diameter cylindrical part is brought into the mounting reference position. A grommet mounting method, wherein the grommet is moved until it matches and is positioned at a required position of the wire harness.

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