JP4992662B2 - Grommet mounting structure to wire harness - Google Patents

Description

The present invention relates to a structure for attaching a grommet to a wire harness , and more specifically, to attach a grommet to a wire harness that is stretched between an engine mounted on an automobile and a vehicle body.

  Conventionally, when a wire harness connected to an engine mounted on an automobile is bridged from the engine room to the vehicle interior, the wire harness is fixed to the engine through a fixing member such as a clip on the engine side, A grommet made of rubber or elastomer that is externally fitted to the wire harness is attached to a vehicle body panel that partitions the engine room and the vehicle compartment, and the wire harness is fixed to the vehicle body panel.

As this type of grommet, the present applicant provides grommet 1 shown in FIG. 6 in Japanese Patent Laid-Open No. 2003-32853 (Patent Document 1). The grommet 1 includes a large-diameter cylindrical portion 1a that allows the wire harness W / H to pass therethrough, and a small-diameter cylindrical portion 1b that protrudes from substantially the center of the large-diameter cylindrical portion 1a. The grommet 1 is attached to the wire harness W / H by tightly fixing or taped to the outer peripheral surface of the H, and the recess 1c provided on the peripheral edge of the large diameter cylindrical portion 1a is fitted to the peripheral edge of the fitting groove 2a of the vehicle body panel 2 The grommet 1 is attached to the vehicle body panel 2.
Therefore, the wire harness W / H is positioned and fixed by the small-diameter cylindrical portion 1b of the grommet 1, and the fixed position becomes a positioning and fixing point for the wire harness W / H with respect to the vehicle body panel 2.

One of the crossover portions of the wire harness W / H that runs between the engine and the vehicle body panel is fixed to the engine and the other is fixed to the vehicle body panel, so that the engine vibrates when the engine is operated. Then, the dimension between both fixed positions changes by this vibration, and the stretching force is loaded on the wire harness W / H.
When the dimension of the wire harness W / H between the fixed position with the engine and the fixed position with the vehicle body panel is short, the expansion / contraction force due to the vibration of the engine is locally applied to the wire harness W / H, and the wire harness W / H H may be damaged.
Therefore, in order to disperse the expansion / contraction force applied to the wire harness W / H, it is desired to lengthen the dimension of the wire harness W / H between the two fixed positions, for example, 200 mm or more is desired. It is rare.

  Therefore, if the wire harness W / H between the fixed position with the engine and the fixed position with the vehicle body panel is loosened, the dimension can be lengthened, but many other members are mounted in the engine room. If the wiring harness W / H is slackened and routed in the engine room, another member may interfere with the wiring harness and the wiring harness may be damaged.

JP 2003-32853 A

The present invention has been made in view of the above problems, without providing the extra length to hung passing the wire harness between the engine and the vehicle body panel, damage of the wire harness by removing the effect of the load by the vibration of the engine It is an object of the present invention to provide a structure for attaching a grommet to a wire harness that can prevent the above.

To solve the above problems, the present invention provides a mounting structure of a grayed grommet to bridged by a wire harness between the engine and the vehicle body to be mounted on an automobile,
A first mounting portion that is attached to the vehicle body side, a cylindrical portion that is continuous with the first mounting portion, and a second mounting portion that is attached to the engine side provided on the other end side of the cylindrical portion are integrally formed of an elastic material. And
The first mounting portion includes a main body portion provided with a concave portion to be engaged with a fitting groove provided in the vehicle body on an outer peripheral surface, and a through hole communicating with the hollow of the cylindrical portion is provided in a central portion of the main body portion. And a pair of elongated elastic pieces projecting from the opposite position of the outer peripheral edge on the outlet side of the through hole, the length of the pair of elastic pieces being 40 mm to 70 mm, and the distal end side of the elastic piece The range of 7 mm to 10 mm is a tape winding portion with the wire harness, and 30 mm to 60 mm is an expansion / contraction allowance,
With the expansion allowance of the pair of expansion pieces contracted , the wire harness penetrating the through hole is fixed to the tip of the pair of expansion pieces by tape winding, and the expansion and contraction pieces are expanded and contracted when vibration of the engine occurs. It provides a mounting structure of a grayed grommet to configuration and to have a wire harness that can absorb vibrations Te.

The structure for attaching the grommet to the wire harness of the present invention having the above-described configuration is not a cylindrical portion that closely attaches the grommet and the wire harness that penetrates the grommet to the outer peripheral surface of the wire harness as in the conventional example. This is done by winding a tape around a pair of expandable and contractible pieces. Therefore, if the wire harness vibrates due to the vibration of the engine when the engine is running, the expansion and contraction piece expands and contracts according to the vibration of the wire harness, so the wire harness absorbs the vibration and is applied to the wire harness. The stretching force can be reduced.
That is, in this onset bright, although fixed wire harness and the tape winding stretchable piece of the grommet, the fixed position is not fixed points that are completely positioned relative to the vehicle body panel, by the expansion and contraction piece is stretchable It is a free fixed point that can be moved.
Therefore, the fixing point where the wire harness is completely positioned with respect to the vehicle body panel can be provided on the indoor side further away from the engine, and between the fixing position on the engine side of the wire harness and the fixing position on the vehicle body panel side. The size of the wire harness can be lengthened, and the stretching force applied to the wire harness by the vibration of the engine can be dispersed to prevent the wire harness from being damaged.

The fitting groove provided in the vehicle body to which the first attachment portion is attached has a U-shape with an upper surface opening, and the main body portion of the first attachment portion has a U-shaped outer shape to be attached to the fitting groove from above. It is preferable that the concave portion for locking is provided on the outer peripheral surface having an arc shape, and the through hole is inclined and penetrated through the main body.
According to the above configuration, the grommet can be attached to the vehicle body by slidingly inserting the main body portion of the first mounting portion of the grommet into the fitting groove provided in the vehicle body, and the grommet can be pushed or pulled into the through hole provided in the vehicle body. Compared to the grommet to be mounted, the mounting work of the grommet to the vehicle body can be facilitated.
In addition, although workability | operativity falls, a pair of said expansion-contraction piece may be provided in the grommet to which it mounts | wears by pushing or pulling into the through-hole provided in the vehicle body.

As described above , the length of the pair of expansion / contraction pieces provided on the grommet is 40 mm to 70 mm, the range of 7 mm to 10 mm on the tip side of the expansion / contraction piece is a tape winding portion with the wire harness, and the expansion / contraction allowance is 30 mm to 60 mm. It is with.
The reason why the expansion / contraction margin of the expansion / contraction piece is set to 30 mm to 60 mm is that if the expansion / contraction allowance length is less than 30 mm, the expansion / contraction piece cannot be sufficiently expanded / contracted in accordance with the vibration of the engine. This is because the stretchable piece becomes longer than necessary.

The cylindrical portion that continues the first mounting portion and the second mounting portion is a bellows cylindrical portion provided with irregularities,
The second mounting portion on the engine side is provided with a locking projection on the outer peripheral surface of the thick-walled cylindrical portion and has a protruding portion with a large diameter at both ends,
It is preferable that the fixing member provided on the engine side is clamped by the clamping portion, and the locking projection is locked and attached to a groove provided in the fixing member.

According to the above configuration, since the wire harness can be protected from the external interference material mounted in the engine room by the cylindrical portion of the grommet and the cylindrical portion is the bellows cylindrical portion, the wiring harness is routed according to the wiring route. Thus, the tube portion can be bent freely.
In addition, the fixing member made of a clip or the like is not directly attached to the wire harness, but the fixing member is held by the holding portion of the second mounting portion of the grommet, and the locking protrusion is locked in the groove provided in the fixing member. Therefore, the fixing member can be reliably positioned and fixed to the grommet.

As described above, according to the present invention, the grommet and the wire harness that penetrates the grommet are fixed by winding the tape on a pair of expandable and contractible pieces. When the wire harness vibrates due to the vibration of the wire harness, the expansion and contraction piece expands and contracts according to the vibration of the wire harness and expands and contracts to absorb the vibration of the wire harness and reduce the expansion and contraction force applied to the wire harness. .
That is, the present invention because it wire harness and the tape winding fixed in a compressed state the expansion piece grayed grommet, the fixed position is not fixed points that are completely positioned relative to the vehicle body panel, expansion piece is stretchable This is a free fixed point that can be moved.
Therefore, the fixing point where the wire harness is completely positioned with respect to the vehicle body panel can be provided on the indoor side further away from the engine, and between the fixing position on the engine side of the wire harness and the fixing position on the vehicle body panel side. The size of the wire harness can be lengthened, and the stretching force applied to the wire harness by the vibration of the engine can be dispersed to prevent the wire harness from being damaged.

Embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of the present invention.
The wire harness grommet 10 of the present embodiment is externally attached to a wire harness W / H that is bridged between an engine (not shown) mounted on an automobile and a vehicle body.

  The grommet 10 includes a first mounting portion 11 that is attached to a vehicle body panel 20 that partitions the engine room (X) and the vehicle compartment (Y), a cylindrical portion 12 that is continuous with the first mounting portion 11, The second mounting portion 13 attached to the engine side provided on the other end side is integrally formed of an elastic material made of rubber or elastomer.

The first mounting portion 11 includes a main body portion 11a having a U-shaped outer shape, and is formed on the periphery of a fitting groove 20a provided in the vehicle body panel 20 on the arc surface of the main body portion 11a and on both side surfaces continuous with the arc surface. The recessed part 11b to latch is provided. A circular through hole 11c communicating with the hollow of the cylindrical portion 12 is provided in the central portion of the main body portion 11a, and a pair of long flexible holes are provided at positions opposite to the outer peripheral edge on the outlet side of the through hole 11c. 11 d of elastic | stretch which has property is protrudingly provided.
The through hole 11c is inclined and penetrated with respect to the axial direction of the main body portion 11a, and the elastic piece 11d protruding from the peripheral edge of the through hole 11c is also inclined and protruded with respect to the axial direction of the main body portion 11a. Yes. As shown in FIG. 1 (B), the extendable piece 11d has an arc shape along the periphery of the through hole 11c, and a rib 11e for preventing the displacement of the tape T is provided on the outer peripheral surface of the tip. Yes. Each elastic piece 11d is provided in a range of approximately 60 degrees in the circumferential direction of the through hole 11c.

The grommet 10 is passed through the wire harness W / H, and the wire harness W / H is pulled out from the through hole 11c. As shown in FIG. The tape T is wound only on the tip side along the tip, and the elastic piece 11d is taped and fixed to the wire harness W / H. Therefore, when an expansion / contraction force is generated in the wire harness W / H, the base portion side around which the tape T is not wound of the expansion / contraction piece 11d becomes linear or bends to expand and contract.
The length of the pair of expansion / contraction pieces 11d is 40 mm to 70 mm, the range of 7 mm to 10 mm on the distal end side of the expansion / contraction piece 11d is the tape winding portion with the wire harness, and the range of 30 mm to 60 mm is the expansion / contraction allowance not taped.

  The cylindrical portion 12 that continues the first mounting portion 11 and the second mounting portion 13 is a cylindrical bellows cylindrical portion in which concave portions 12a and convex portions 12b are alternately provided in the axial direction, and the axial direction of the cylindrical portion 12 is It is made to incline with respect to the axial direction of the one attachment part 11, and is made to correspond with the axial direction of the through-hole 12c of the 1st cylinder part 12, and the length direction of the expansion-contraction piece 12d.

  The second mounting portion 13 has a plurality of locking projections 13b circumferentially spaced on the outer peripheral surface of the thick-walled cylinder portion 13a and extends in the circumferential direction at both ends of the thick-walled tube portion 13a. A rib-shaped sandwiching portion 13c is projected. Further, a small-diameter cylindrical portion 13d is projected from the center of the distal end side of the thick-walled cylindrical portion 13a.

The wire harness W / H is penetrated through the grommet 10, and as shown in FIG. 2, the small diameter cylindrical portion 13d of the second mounting portion 13 is brought into close contact with the outer peripheral surface of the wire harness W / H, and the small diameter cylindrical portion 13d The tape T is wound around the outer peripheral surface and the outer peripheral surface of the wire harness W / H drawn from the small diameter cylindrical portion 13d, and the second mounting portion 13 side of the grommet 10 is positioned and fixed to the wire harness W / H.
On the other hand, on the first mounting portion 11 side of the grommet 10, the distal end portion of the expansion / contraction piece 11d that has been bent and slightly contracted is placed on the outer peripheral surface of the wire harness W / H drawn out from the through hole 11c as described above. The tape T is wound only around the tip portion and fixed with the tape. At this time, since the expansion / contraction piece 11d is not fully expanded / contracted but slightly contracted, when the expansion / contraction force is applied to the wire harness W / H, the expansion / contraction piece 11d may expand as shown in FIG. As shown in FIG. 5B, it can be further shrunk. That is, the wire harness W / H is not completely positioned and fixed on the first mounting portion 11 side, which is the vehicle compartment side, but is free fixed so as to be movable by the expansion and contraction of the expansion and contraction piece 11d.

As shown in FIG. 3, the first mounting portion 11 is attached to the vehicle body panel 20 by inserting the first mounting portion 11 from above into a fitting groove 20 a having a U-shaped upper surface opening provided in the vehicle body panel 20. And the recessed part 11b of the 1st attaching part 11 is fitted and attached to the periphery of the fitting groove 20a.
Further, as shown in FIG. 4, a protector 30 made of a resin molded product is externally mounted on the passenger compartment side of the wire harness W / H drawn from the first mounting portion 11 side of the grommet 10, and tapes provided at both ends of the protector 30. The tape T is wound around the winding tongue piece 30a, and the wire harness W / H and the protector 30 are completely positioned and fixed at the tape winding position. The protector 30 is integrally formed with a vehicle body locking portion 30b, and the vehicle body panel 30b is inserted and locked into the locking hole 21a of the vehicle body panel 21, so that the protector 30 is positioned and fixed to the vehicle body panel 21. .

In this way, the wire harness W / H is taped and fixed to the expansion / contraction piece 11d of the grommet 10, but the fixing position is free fixing that can be moved by the expansion / contraction of the expansion / contraction piece 11d. It is not a perfect positioning and fixing point for H body panel.
On the other hand, the protector 30 is externally mounted on the wire harness W / H and positioned and fixed by the tape winding tongue 30a, and the protector 30 is positioned and fixed to the vehicle body panel 21 via the vehicle body locking portion 30b. The tape winding fixing position in the tape winding tongue piece 30a between the W / H and the protector 30 is a complete positioning fixing point F1 of the wire harness W / H on the vehicle body side.

The second mounting portion 13 of the grommet 10 is attached to the engine by holding a fixing member 40 which is attached to the engine and positioned or fixed, or is provided integrally with the engine by the holding portion 13c of the thick-walled cylinder portion 13a. At the same time, the locking protrusion 13b is locked and attached to the groove 40a provided in the fixing member 40.
In this way, the thick cylindrical portion 13a of the second mounting portion 13 is positioned and fixed to the engine-side fixing member 40, and the wire harness W / H and the grommet are wound by tape winding around the small diameter cylindrical portion 13d of the second mounting portion 13. 10, the tape winding fixing position between the wire harness W / H and the small-diameter cylindrical portion 13d becomes the positioning fixing point F2 of the wire harness W / H on the engine side.

According to the above-described configuration, the wire harness W / H is expanded and contracted on the first mounting portion 11 side that fixes the grommet 10 to the vehicle body panel 20 without completely positioning and fixing the wire harness W / H to the first mounting portion 11. As shown in FIG. 5, when the wire harness W / H vibrates due to the vibration of the engine, the telescopic piece 11d matches the vibration of the wire harness W / H because the tape is fixed to the pair of possible elastic pieces 11d. It can expand and contract, absorb the vibration of the wire harness W / H, and reduce the expansion and contraction force applied to the wire harness W / H.
Thus, since the wire harness W / H and the grommet 10 are not completely positioned and fixed on the vehicle body side, the wire harness W / H in which the positioning fixing point on the vehicle body side of the wire harness W / H is further away from the engine It becomes a fixed point F1 with the protector 30. Therefore, the dimension of the wire harness W / H between the fixing point F1 on the vehicle body panel side and the fixing point F2 on the engine side can be lengthened, and the stretching force applied to the wire harness by the vibration of the engine is dispersed, Damage to the wire harness can be prevented.

  In addition, the grommet 10 of the present invention includes not only the first mounting portion 11 that is attached to the vehicle body panel 20 but also the cylindrical portion 12 and the second mounting portion 13 that is attached to the engine side. 13d is brought into close contact with the wire harness W / H and taped to prevent water from entering the grommet 10. Therefore, since it is not necessary to provide a water-stop structure on the inner side of the grommet 10 on the first attachment portion 11 side, it is possible to perform free fixing in which the stretchable piece 11d and the wire harness W / H are taped and fixed.

Further, the grommet 10 can be attached to the vehicle body panel 20 by slidingly inserting the main body portion 11a of the first mounting portion 11 of the grommet 10 into the fitting groove 20a provided in the vehicle body panel 20, and the grommet 10 can be attached to the vehicle body panel 20. Can be easily attached to.
In addition, the wire harness W / H can be protected from the external interference material mounted in the engine room by the cylindrical portion 12 of the grommet 10 and the cylindrical portion 12 is a bellows cylindrical portion. It can be bent freely according to the cable route.

  Further, instead of directly attaching a fixing member made of a clip or the like to the wire harness W / H, the fixing member 40 is clamped by the clamping portion 13c of the second mounting portion 13 of the grommet 10, and a groove 40a provided in the fixing member 40 is also provided. Therefore, the fixing member 40 can be reliably positioned and fixed to the grommet 10.

The grommet used by embodiment of this invention is shown, (A) is a top view, (B) is a left view, (C) is a front view, (D) is an AA sectional view, (E) is a bottom view. It is. It is drawing which shows the state which attached the grommet to the wire harness. It is drawing which shows the mounting method to the vehicle body panel of a grommet. It is drawing which shows the state which wired the wire harness to the motor vehicle. (A) (B) is drawing which shows the state which the expansion-contraction piece of a grommet expands / contracts. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Grommet 11 1st attaching part 11a Main body part 11b Recessed part 11c Through-hole 11d Telescopic piece 12 Tube part 13 Second attaching part 13a Thick cylinder part 13b Locking protrusion 13c Clamping part 20 Car body panel 20a Fitting groove W / H Wire harness

Claims (3)

A mounting structure of a grayed grommet to bridged by a wire harness between the engine and the vehicle body to be mounted on an automobile,
A first mounting portion that is attached to the vehicle body side, a cylindrical portion that is continuous with the first mounting portion, and a second mounting portion that is attached to the engine side provided on the other end side of the cylindrical portion are integrally formed of an elastic material. And
The first mounting portion includes a main body portion provided with a concave portion to be engaged with a fitting groove provided in the vehicle body on an outer peripheral surface, and a through hole communicating with the hollow of the cylindrical portion is provided in a central portion of the main body portion. And a pair of elongated elastic pieces projecting from the opposite position of the outer peripheral edge on the outlet side of the through hole, the length of the pair of elastic pieces being 40 mm to 70 mm, and the distal end side of the elastic piece The range of 7 mm to 10 mm is a tape winding portion with the wire harness, and 30 mm to 60 mm is an expansion / contraction allowance,
With the expansion allowance of the pair of expansion pieces contracted , the wire harness penetrating the through hole is fixed to the tip of the pair of expansion pieces by tape winding, and the expansion and contraction pieces are expanded and contracted when vibration of the engine occurs. mounting structure of grayed grommet to configuration and to have a wire harness that can absorb vibrations Te. The fitting groove provided in the vehicle body to which the first attachment portion is attached has a U-shape with an upper surface opening, and the main body portion of the first attachment portion has a U-shaped outer shape to be attached to the fitting groove from above. , with which a recess for the locking in the outer peripheral surface which is arcuate, the through hole mounting of grayed grommet to the wire harness according to claim 1 which is penetrated by inclined to said main body portion Structure . The cylindrical portion that continues the first mounting portion and the second mounting portion is a bellows cylindrical portion provided with irregularities,
The second mounting portion on the engine side is provided with a locking projection on the outer peripheral surface of the thick-walled cylindrical portion and has a protruding portion with a large diameter at both ends,
The wire harness according to claim 1 or 2, wherein a fixing member provided on the engine side is clamped by the clamping portion, and the locking projection is locked and attached to a groove provided in the fixing member. mounting structure of the grommet to.

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