JP2004194392A - Grommet and method of manufacturing wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grommet which can easily attain certain water stoppage in the water stopping part of a wire harness. <P>SOLUTION: This grommet 10 has the first split body 12 and the second split body 13 being divided along a face parallel with the axis of a catch 11 so as to catch the water stopping part of the wire harness 3, where a point charged with a water stopping agent serves as a water stopping part by winding an adhesive tape around cables en block, thereby covering them after charging the specified points among many cables bundled with one another with water stopping agents, in diametrical direction by the tubular catch 11. The internal dimension S1 in the direction of splitting between the first split body 12 and the second split body 13 in the above catch 11 is made under the maximum diameter S2 of a section equivalent to the above water stopping part of the above wire harness 3. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a grommet and a wire harness.
[0002]
[Prior art]
Conventionally, rescue means for transmitting a rescue signal from a submerged vehicle has been known. As shown in FIGS. 5 and 6, for example, the rescue means includes a detecting means 1 for detecting inundation into the vehicle, a transmitting means 2 for transmitting a rescue signal based on a detection signal of the detecting means 1, and a detecting means 1. And a wire harness 3 for connecting the transmitting means 2.
[0003]
The transmitting means 2 is housed in a waterproof box 5 arranged under the seat 4 of the vehicle, for example. The waterproof box 5 includes a box body 5a having a notch 6 and a lid 5b. The wire harness 3 is drawn into the waterproof box 5 from the notch 6 and connected to the transmitting means 2. .
[0004]
As shown in FIG. 7, the wire harness 3 fills a predetermined location between a number of wires 3a bundled with each other with a waterproofing agent 3b, and then covers the wires 3a by collectively winding an adhesive tape 3c. Thus, the portion filled with the water stopping agent 3b is used as a water stopping portion, and the grommet 7 provided in the water stopping portion is disposed in the cutout portion 6.
[0005]
The grommet 7 has a divided body 7a and a seal portion 7b that are divided along a plane parallel to an axis of a cylindrical holding portion 8 that holds the water stop portion in the radial direction. The main body 7a and the seal portion 7b are detachably connected to each other (for example, see Patent Document 1).
Then, in a state where the water stopping portion of the wire harness 3 is held in the radial direction by the holding portion 8 of the grommet 7, the seal portion 7 b of the grommet 7 is fitted into the notch 6 provided in the box body 5 a of the waterproof box 5. The grommet 7 is arranged in the notch 6 of the waterproof box 5 by locking the lid 5b to the box body 5a.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 8-251768
[Problems to be solved by the invention]
By the way, in a state where the grommet 7 is arranged in the notch 6 of the waterproof box 5, the gap between the grommet 7 and the notch 6, the gap between the grommet 7 and the wire harness 3, and the water stop portion of the wire harness 3 are Although each is sealed, the water stopping property of the water stopping portion is obtained by reliably filling the water stopping agent 3b between the electric wires 3a. However, there is a problem that the water stopping portion is rubbed by hand, and the hand rubbing operation of the water stopping portion is troublesome and inferior in workability.
[0008]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a grommet and a method of manufacturing a wire harness in which a reliable water stop can be easily obtained in a water stop portion of the wire harness.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides, as described in claim 1, an adhesive tape applied to each of the wires after filling a predetermined portion between a plurality of wires bundled with each other with a waterproofing agent. By winding and covering the water stopping agent in the wire harness in which a portion filled with the water stopping agent becomes a water stopping portion, in order to hold the water stopping portion in a radial direction by a cylindrical holding portion, A grommet having a first divided body and a second divided body that are divided along a plane parallel to the axis of the grommet, and along a dividing direction of the first divided body and the second divided body in the holding portion. The inner dimension is smaller than the maximum diameter of a portion corresponding to the water stop portion of the wire harness.
[0010]
In the grommet configured as described above, since the inner size of the holding portion along the dividing direction of the first divided body and the second divided body is smaller than the maximum diameter of the portion corresponding to the water stop portion of the wire harness, The water stop portion of the wire harness is deformed into an ellipse in the holding portion of the grommet, and the water stopping agent is securely filled between the electric wires, so that the grommet is simply attached to the water stop portion of the wire harness. As a result, reliable water stoppage can be easily obtained.
[0011]
Therefore, in this grommet, as in the prior art, in order to obtain reliable water stopping at the water stopping portion of the wire harness, an operator rubs the water stopping portion by hand after winding the adhesive tape, and the like. This can solve the problem that the work of massaging the part is troublesome and inferior in workability.
[0012]
Further, according to the present invention, the inner wall shape of at least one of the first divided body and the second divided body is a short-axis elliptical arc surface.
[0013]
In the grommet configured as described above, the inner wall shape of at least one of the first divided body and the second divided body is defined as a short-axis elliptical arc surface, and the radius of curvature is determined from the radius of curvature of the outer diameter of the water stopping portion of the wire harness. Since it is large, the water stopping portion of the wire harness can be reliably flattened into an elliptical shape within the holding portion of the grommet.
[0014]
Further, according to the present invention, as described in claim 3, after filling a water-stopping agent in a predetermined location between a number of wires bundled together, the adhesive tape is collectively wound around each of the wires to cover the wires. Thereby, a portion filled with the water-stopping agent is used as a water-stopping portion, and then a first split body and a second split body that are split along a plane parallel to an axis of the tubular holding portion are provided. A method of manufacturing a wire harness in which the water stop portion is held in a radial direction by a grommet, wherein an inner dimension of the holding portion in the split direction of the first split body and the second split body is determined in advance by the wire By setting the diameter of the harness to be less than the maximum diameter of a portion corresponding to the water stop portion, the cross section of the water stop portion is deformed into a substantially elliptical shape.
[0015]
In the manufacturing method of the wire harness configured as described above, the inner dimension of the holding portion along the dividing direction of the first divided body and the second divided body is smaller than the maximum diameter of a portion corresponding to the water stop portion of the wire harness. As the cross-sectional shape of the water stopping portion is deformed into an approximately elliptical shape, the water stopping agent is reliably filled between the electric wires at the water stopping portion, thereby attaching the grommet to the water stopping portion of the wire harness. By this means, reliable water stopping can be easily obtained in the water stopping portion.
[0016]
Therefore, in this method of manufacturing a wire harness, as in the related art, in order to obtain reliable water stopping at the water stopping portion of the wire harness, an operator manually rubs the water stopping portion after winding the adhesive tape. The problem that the hand-rubbing operation of the lever stop portion is troublesome and inferior in workability can be solved.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the embodiment described below, the description of the wire harnesses already described in FIG. 7 is simplified or omitted by attaching the same reference numerals or corresponding reference numerals in the drawings.
[0018]
As shown in FIGS. 1 and 2, the grommet 10 according to the embodiment of the present invention includes a holding portion 11 for holding the water stop portion of the wire harness 3 in a radial direction by a cylindrical holding portion 11. Has a divided body 12 as a first divided body and a seal portion 13 as a second divided body, which are divided along a plane parallel to the axis in.
[0019]
The split body 12 has a rectangular plate shape, and a water stop portion of the wire harness 3 is arranged at a central portion in the longitudinal direction so as to face the axis of the wire harness 3 along the lateral direction. The side of the central portion in the longitudinal direction away from the wire harness 3 is a bulging portion 14 bulging in a convex shape, and the side of the central portion in the longitudinal direction facing the wire harness 3 is a flat portion 15.
[0020]
Locking ribs 16 project downward from both sides in the longitudinal direction of the plane on the flat portion 15 side of the divided body 12, and the locking rib 16 has a tip on a sealing portion 13 side described later. A hook-shaped locking piece 17 locked to the portion 29 is provided outside the longitudinal direction of the divided body 12. Further, ribs 18 protruding upward are respectively provided on both sides in the short direction of the bulging portion 14 of the divided body 12 along the longitudinal direction of the divided body 12. On both sides, a total of four lock arms 19 are provided which are fixed to the locking projections 39 of the box body 31 of the waterproof box 30 described later.
[0021]
The lock arm 19 includes two arms 20 that extend outward from the distal end of the rib 18 in the lateral direction of the divided body 12 and then extend downward, and a connecting piece 21 that connects the distal ends of the two arms 20 to each other. The connecting piece 21 is locked by the locking projection 39.
A seal piece 22 (see FIG. 3) made of rubber or the like is provided on one side of the surface of the divided body 12 on the side of the bulging portion 14 along the longitudinal direction of the divided body 12.
[0022]
On the other hand, the seal portion 13 is formed of a rectangular member substantially similar to the divided body 12 in a plan view, and the water stop portion of the wire harness 3 extends along its axis in the transverse direction at the center in the longitudinal direction. In addition, they are arranged to face each other.
A concave portion 23 having a short-axis elliptical arc-shaped inner peripheral wall having a radius of curvature larger than the radius of curvature of the outer diameter of the wire harness 3 is formed at a central portion in the longitudinal direction of the seal portion 13. Both ends of the direction are open,
The bottom of the concave portion 23 is curved so as to bulge downward to form a curved portion 24. The concave portion 23 of the seal portion 13 and the flat portion 15 of the split body 12 form a cylindrical holding portion 11 for holding the water stop portion of the wire harness 3 in the radial direction. .
[0023]
A plate member 24 is disposed at each of both ends in the circumferential direction of the concave portion 23, and a square concave portion 26 is formed on a surface of the plate member 24 facing the wire harness 3, and is surrounded by ribs 25 on all sides. I have. A rib 27 extending along the short direction of the seal portion 13 is bridged in the concave portion 26, and a locking piece 17 of the divided body 12 is provided between a lower surface of the rib 27 and a bottom surface of the concave portion 26. A space 28 which can be inserted with a gap is formed, and the lower surface of the rib 27 serves as a locking portion 29 of the locking piece 17, and a locking portion is provided between the rib 27 and the rib 25 on the concave portion 23 side. A space 130 is formed in which the piece 17 can be inserted while being elastically deformed (see FIG. 2A).
[0024]
A plurality of waterproof ribs 131 made of rubber or the like extending in the longitudinal direction are provided at predetermined intervals in the short direction at the bottom of the seal portion 13, and on the upper surface of the plate member 24 on both longitudinal sides of the seal portion 13. A waterproof member (not shown) made of a soft member or the like for sealing between the plate member 24 of the seal portion 13 and the divided body 12 is arranged.
[0025]
In order to radially clamp the water stopping portion of the wire harness 3 with the holding portion 11 of the grommet 10 having the above configuration, the wire harness 3 is stopped between the flat portion 15 of the divided body 12 and the concave portion 23 of the seal portion 13. The water portion is disposed, and then the locking piece 17 of the divided body 12 is inserted into the space 130 on the seal portion 13 while being elastically deformed, and the locking piece 17 is further pushed in so that the locking piece 17 is inserted into the space 28. When it reaches, the locking piece 17 elastically returns and is opened to the space 28 and locked by the locking portion 29.
[0026]
As a result, the divided body 12 and the seal portion 13 are joined, and the water stopping portion of the wire harness 3 is held in the radial direction by the holding portion 11 of the grommet 10.
In addition, after the division | segmentation body main body 12 and the sealing part 13 are couple | bonded, the sealing part 13 can be detached from the division | segmentation body main body 12 by pulling either strongly in the division | segmentation direction, for example.
[0027]
Here, in this embodiment, the inner dimension S1 of the sandwiching portion 11 along the dividing direction of the divided body 12 and the seal portion 13 is smaller than the maximum diameter S2 of a portion corresponding to the water stop portion of the wire harness 3. As a result, the water stopping portion of the wire harness 3 is deformed into an ellipse in the holding portion 11 of the grommet 10, and the water stopping agent is reliably filled between the electric wires 3a.
[0028]
When the locking piece 17 on the divided body 12 is locked by the locking part 29 on the seal part 13, the locking piece 17 is inserted into the space 28 on the seal part 13 with a gap. Therefore, the divided body 12 has a certain amount of play in the dividing direction with respect to the seal portion 13 by the gap.
Therefore, a gap is also formed between the opposing surfaces of the plate member 24 of the seal portion 13 and the divided body 12, so that the waterproof member made of the soft member or the like interposed between the opposing surfaces is displaced. It can be easily returned to the original position (between the opposing surfaces).
[0029]
Then, the grommet 10 is arranged in the notch 32 of the waterproof box 30 in a state where the water stop portion of the wire harness 3 is held in the radial direction by the holding portion 11 of the grommet 10. As shown in FIGS. 1 and 3, the waterproof box 30 includes a box body 31 having a notch 32 and a lid 33 that covers an upper opening of the box body 31.
[0030]
The upper surface on one end side of the box main body 31 is a sealing surface 34 higher than other portions and is defined by ribs 35. A concave portion 36 corresponding to the bottom shape of the seal portion 13 of the grommet 10 is formed at a substantially central portion of the seal surface 34, and the central portion of the concave portion 36 corresponds to another portion corresponding to the curved portion 24 of the seal portion 13. It is a deeper bottom portion 37.
[0031]
Ribs 38 are provided on both sides of the recess 36 in the width direction (the short direction of the grommet 10), and a central portion of each rib 38 has a shape corresponding to the cross-sectional shape of the recess 23 of the seal portion 13. A notch 32 is formed.
Locking projections 39 to which the lock arms 19 of the divided body 12 are fixed are provided on the outer surfaces of the ribs 25 located on both sides of the notch 32.
[0032]
As shown in FIGS. 3 and 4, the lid 33 has a sealing surface 34 provided at one end of the box body 31 and a sealing surface provided at the other end of the box body 31. 40 and a weather strip 41 pressed against sealing surfaces (not shown) provided on both sides of the box body.
Further, on the periphery of the lid 33, locking portions 43 for locking with a plurality of locking projections 42 provided at predetermined positions on the peripheral wall of the box main body 31 are provided corresponding to the number of the locking projections 42. I have.
[0033]
Then, in order to dispose the grommet 10 in the cutout portion 32 of the waterproof box 30 in a state where the water stopping portion of the wire harness 3 is held in the radial direction by the holding portion 11 of the grommet 10, first, the concave portion of the box body 31 is provided. The sealing portion 13 of the grommet 10 is fitted into 36, and then the connecting piece 21 of the lock arm 19 is locked to the locking projection 39 of the box body 31 with the divided body 12 pressed against the sealing portion 13.
Thereby, the grommet 10 is fixed to the concave portion 36 of the box body 31 without rattling. In this fixed state, the surface of the grommet 10 on the side of the bulging portion 14 of the divided body 12 is substantially flush with the sealing surface 34 of the box body 31.
[0034]
Next, the lid 33 is placed on the upper opening of the box body 31, and the respective weather strips 41 attached to the lid 33 are respectively sealed with the sealing surface 34 of the box body 31 including the upper surface of the divided body 12 of the grommet 10. Pressing against the sealing surface 40 on the other end of the main body 31 and the sealing surfaces on both sides of the box main body 31, and in this state, the plurality of locking portions 43 provided on the peripheral edge of the lid 33 are engaged with the locking projections on the box main body 31 side. The lid 33 is fixed to the box main body 31 by being locked to 42, whereby the grommet 10 is arranged in the notch 32 of the waterproof box 30.
[0035]
In a state where the grommet 7 is disposed in the notch 6 of the waterproof box 5, the waterproof rib 131 provided on the bottom of the seal 13 is provided between the seal 13 of the grommet 7 and the recess 36 of the box body 31. Sealing is performed, and the gap between the grommet 10 and the wire harness 3 is sealed by a waterproof member made of a soft member or the like interposed between the plate member 24 of the seal portion 13 and the facing surface of the split body 12. The weather strip 41 seals between the sealing surface 34 of the box main body 31 including the upper surface of the main body 12 and the lid 33 and between the sealing surface 40 on the other end side of the box main body 31 and the sealing surfaces on both sides and the lid 33. The water stopping portion of the wire harness 3 is deformed into an ellipse in the holding portion 11 of the grommet 10, and the water stopping agent is surely filled between the electric wires 3a and adapted. Seal have been made.
[0036]
In FIGS. 1 and 2, reference numerals 50 and 51 denote tongues extending from the divided body 12 and the seal part 13 to the outside, respectively. Each tongue 50 and 51 is a wire harness projecting from the waterproof box 30. 3 is wound around with a tape or the like across the outer diameter portion.
[0037]
As is clear from the above description, according to the grommet 10 described above, the inner dimension S1 of the sandwiching portion 11 along the dividing direction of the divided body 12 and the seal portion 13 corresponds to the water stopping portion of the wire harness 3. By making the diameter smaller than the maximum diameter S2 of the portion, the water stopping portion of the wire harness 3 is deformed into an ellipse in the holding portion 11 of the grommet 10 so that the water stopping agent is reliably filled between the electric wires 3a. Therefore, only by attaching the grommet 10 to the water stopping portion of the wire harness 3, reliable water stopping can be easily obtained at the water stopping portion.
[0038]
Therefore, in this grommet 10, in order to obtain reliable water stopping at the water stopping portion of the wire harness 3 as in the related art, an operator manually rubs the water stopping portion after winding the adhesive tape 3c. This can solve the problem that the hand-kneading operation of the water stopping portion is troublesome and inferior in workability.
[0039]
Since the inner wall shape of the concave portion 23 of the seal portion 13 of the grommet 10 is a short-axis elliptical arc surface and the radius of curvature is larger than the radius of curvature of the outer diameter of the water stopping portion of the wire harness 3, the water stopping of the wire harness 3 is performed. The portion can be reliably flattened into an elliptical shape in the holding portion 11 of the grommet 10.
[0040]
Note that the grommet of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, the case where the concave portion 23 having the short-axis elliptical arc surface is formed on the seal portion 13 side is taken as an example. However, the present invention is not limited thereto. A concave portion having an axial elliptical arc surface may be formed, or a concave portion having an inner wall shape of a short axis elliptical arc surface may be formed in both the seal portion 13 and the divided body 12.
[0041]
In addition, the materials, shapes, dimensions, and the like of the electric wires, the waterproofing agent, the adhesive tape, the waterproofing portion, the wire harness, the holding portion, the first and second divided bodies, the inner walls of the divided bodies, and the like exemplified in the above-described embodiment. The form, number, arrangement location, and the like are not limited as long as the present invention can be achieved.
[0042]
【The invention's effect】
As described above, according to the present invention, as described in claim 1, the inner dimension of the holding portion along the dividing direction of the first divided body and the second divided body is equal to the water stopping portion of the wire harness. Is smaller than the maximum diameter of the portion corresponding to the wire harness, the waterproof portion of the wire harness is deformed into an ellipse in the holding portion of the grommet, and the waterproof agent is reliably filled between the electric wires, so that the waterproofness of the wire harness is reduced. By simply attaching the grommet to the part, reliable water stopping can be easily obtained in the water stopping part.
Therefore, in this grommet, as in the prior art, in order to obtain reliable water stopping at the water stopping portion of the wire harness, an operator rubs the water stopping portion by hand after winding the adhesive tape, and the like. This can solve the problem that the work of massaging the part is troublesome and inferior in workability.
[0043]
Further, according to the present invention, the inner wall shape of at least one of the first divided body and the second divided body is defined as a short-axis elliptical arc surface, and the radius of curvature thereof is set outside the water stopping portion of the wire harness. Since the radius of curvature is made larger than the radius of curvature, the water stop portion of the wire harness can be reliably flattened into an elliptical shape within the holding portion of the grommet.
[0044]
Further, according to the present invention, as described in claim 3, the inner dimension of the holding portion along the dividing direction of the first divided body and the second divided body is set to the maximum diameter of the portion corresponding to the water stop portion of the wire harness. Since the cross-sectional shape of the water stop portion is deformed into a substantially elliptical shape as less than, the water stopping agent is reliably filled between the electric wires at the water stop portion, and thereby the grommet is inserted into the water stop portion of the wire harness. Just by attaching, the reliable water stoppage can be easily obtained in the water stoppage part.
[0045]
Therefore, in this method of manufacturing a wire harness, as in the related art, in order to obtain reliable water stopping at the water stopping portion of the wire harness, an operator manually rubs the water stopping portion after winding the adhesive tape. The problem that the hand-rubbing operation of the lever stop portion is troublesome and inferior in workability can be solved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a divided body main body and a seal portion of a grommet according to an embodiment of the present invention and a box main body of a waterproof box.
FIGS. 2A and 2B are cross-sectional views of a grommet according to an embodiment of the present invention, in which FIG. 2A is a cross-sectional view showing a state before a water stopping portion of a wire harness is held by a holding portion of a grommet, and FIG. FIG. 5 is a cross-sectional view showing a state after the water stop portion is held by a holding portion of a grommet.
FIG. 3 is an exploded perspective view of the waterproof box in a state where the grommet according to the embodiment of the present invention is disposed in a notch of the box body.
FIG. 4 is a cross-sectional view showing a state in which the grommet according to the embodiment of the present invention is fixed to a notch of a waterproof box.
FIG. 5A is an explanatory diagram illustrating a rescue means of the vehicle, and FIG. 5B is an explanatory diagram illustrating a state in which the vehicle is submerged.
FIG. 6 is an exploded perspective view for explaining a conventional grommet and a waterproof box.
FIG. 7 is a perspective view for explaining a manufacturing process of the wire harness.
[Explanation of symbols]
Reference Signs List 3 wire harness 3a electric wire 3b waterproofing agent 3c adhesive tape 10 grommet 11 holding portion 12 divided body (first divided body)
13 Seal part (second divided body)

Claims (3)

After filling a predetermined portion between a large number of wires bundled with each other with a water-stopping agent, an adhesive tape is collectively wound around each of the wires to cover the wires, so that the portions filled with the water-stopping agent stop water. A first divided body and a second divided body divided along a plane parallel to an axis of the holding portion in order to hold the water stopping portion in the wire harness serving as a portion in a radial direction by a cylindrical holding portion. A grommet having a body,
A grommet, wherein an inner dimension of the holding portion along the dividing direction of the first divided body and the second divided body is smaller than a maximum diameter of a portion corresponding to the water stop portion of the wire harness. The grommet according to claim 1, wherein an inner wall shape of at least one of the first divided body and the second divided body is a short-axis elliptical arc surface. After filling a predetermined portion between a number of wires bundled with each other with a water-stopping agent, the respective wires are collectively wound with an adhesive tape to cover the wires, thereby stopping the portion filled with the water-stopping agent. And a wire harness in which the water stopping portion is radially clamped by a grommet having a first divided body and a second divided body divided along a plane parallel to an axis of the tubular clamping section. The method of manufacturing
By previously setting an inner dimension of the holding portion along the dividing direction of the first divided body and the second divided body to be less than a maximum diameter of a portion corresponding to the water stopping portion of the wire harness, A method of manufacturing a wire harness, comprising: changing a cross-sectional shape of a portion into a substantially elliptical shape.

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