JP2010173400A - Clamp for wiring harness, and vehicle wiring structure for wiring harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp capable of suppressing the transmission of vibration to a wiring harness fixed to a fixing body in which the vibration is generated. <P>SOLUTION: The clamp mounted to the wiring harness and mounted to the fixing body through a locking part is provided with an outer cylinder integrally projectingly provided at the wiring harness fixed part; and an inner cylinder having the locking part; and a coil spring arranged between the inner cylinder and the outer cylinder. The vibration loaded by the fixing body is attenuated by the coil spring. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a clamp for a wire harness and a vehicle body routing structure of the wire harness using the clamp, and more particularly, is attached to a wire harness routed in a vehicle and fixed to a stud bolt protruding from a fixing member such as a vehicle body. The wire harness is fixed to the vehicle body or the like.

Conventionally, various clamps for fixing a wire harness to a vehicle body have been proposed.
As this type of clamp, a band clamp or a substrate type clamp is widely used. These have locking blades protruding from a band fastening portion that is wound around and fastened to a wire harness, or locking blades are protruding from a substrate that is wound around a wire harness. The locking blade is inserted into the mounting hole of the vehicle body by being bent, and the locking step at the tip of the locking blade that has spread after the insertion is locked to the periphery of the mounting hole.

However, since the vibration absorbing mechanism is not provided in the band clamp or the substrate type clamp itself, when vibration is generated on the fixed vehicle body side, the vibration is transmitted to the wire harness without being attenuated.
In order to solve this problem, conventionally, a wire harness routed between the engine and the vehicle body is bent to have a slack so as to absorb the fatigue of the wire harness due to vibration.
However, the wire harness that runs between the engine and the vehicle body vibrates at different frequencies between the engine and the vehicle body, so that the wire harness is subjected to an unexpected impact, and the wire harness is bent and relaxed. The countermeasures against vibration are not enough.
Therefore, it is desired that a clamp for attaching the wire harness to a body part that is likely to generate vibration or a fixing member fixed to the body has a vibration absorbing mechanism.

In order to satisfy the above-mentioned requirements, in the conventional Japanese Patent Application Laid-Open No. 2003-125525, clips shown in FIGS. 5A, 5B, 5C, and 5D are used as clips for fixing a wire harness to a movable body such as an engine. Proposed.
The clip 100 has a shape in which one end of an attachment shaft portion 102 having an engaging circumferential groove portion 101 is integrally projected from the wire harness holding portion 103. In the clip shown in FIGS. The holding part 103 is put on the outer periphery of the corrugated tube 110 through the wire harness W / H, and is fastened and fixed by a fastening band 120. That is, two separate parts consisting of the fastening band 120 together with the clip 100 are required.
Further, in the clip shown in FIG. 5D, the wire harness holding portion 103A is a cylinder, the mounting shaft portion 102 is projected from the outer periphery of the cylinder, and the wire harness W / H is passed through the wire harness holding portion 103A. Yes. In this case, since the wire harness W / H needs to be passed through the wire harness holding portion 103A, when a connector or the like is connected to the wire harness, the work of passing the wire harness through the wire harness holding portion is very This is a difficult task and practically unusable.

  In any of the above types, as shown in FIG. 5C, the mounting shaft portion 102 is inserted and fixed in a mounting hole 152 provided in a bracket 151 protruding from the engine 150. Specifically, the shaft portion 102a is passed through the mounting hole 152, then the tapered guide portion 102b is forcibly inserted into the mounting hole 152, and the continuous circumferential groove portion 101 is attached to the large diameter side of the tapered guide portion 102b. The inner surface of the hole 152 is fitted.

In the clip of Patent Document 1, the engagement circumferential groove portion 101 of the attachment shaft portion 102 is positioned in the attachment hole 152, and is prevented from coming off at the peripheral edge on the large diameter side of the tapered guide portion 102b. The configuration is substantially the same as that of the blade.
Since the clip 100 is formed of a rubber material, vibration generated in the engine 150 is absorbed and transmission of vibration to the wire harness W / H via the clip 100 is suppressed.

JP 2003-125525 A

As described above, in Patent Document 1, the clip 100 is formed of a rubber material to absorb the vibration of the engine. However, the engagement circumferential groove portion 101 of the clip is attached to the mounting hole 152 of the bracket 151 protruding from the engine. Therefore, the engine vibration is transmitted to the clip 100 without being attenuated. That is, the vibration attenuation at the clip 100 depends only on the vibration absorption force by the rubber material, and it is recognized that the vibration attenuation rate is extremely low.
In addition, the configuration of the clip 100 is complicated, and in the configuration shown in FIGS. 5A to 5C, a separate fastening band is required, and in the configuration shown in FIG. 5D, to the cylindrical wire harness holding portion. It is difficult to penetrate the wire harness, and there is a high possibility that the wire harness itself vibrates in the cylinder.

  An object of the present invention is to provide a clamp that is simple in configuration, has a high attenuation rate of vibration generated in an engine or a vehicle body that fixes a wire harness, and can significantly reduce transmission of vibration to the wire harness.

In order to solve the above problems, the present invention is a clamp attached to a wire harness and attached to a fixed body via a locking portion,
An outer cylinder integrally projecting on the wire harness fixing portion; an inner cylinder provided with the locking portion; and a coil spring disposed between the inner cylinder and the outer cylinder; There is provided a clamp for a wire harness characterized by attenuating applied vibration.

  The inner cylinder protrudes from the inner peripheral surface with a locking claw that is fitted and locked to a stud bolt protruding from the fixed body, or a locking blade that is inserted and locked into a locking hole provided in the fixed body. Projecting from the lower end.

Specifically, the vibration absorbing portion is integrally formed on the outer surface of the wire harness fixing portion formed of a band clamp box portion that is wound and fastened by winding the band portion around the wire harness, or a substrate type clamp substrate that is attached by tape winding around the wire harness. Project
The vibration absorbing portion includes the inner cylinder and the outer cylinder that surrounds a coil spring disposed on the outer peripheral surface of the inner cylinder.
A flange is provided at the lower end of the inner cylinder, and the coil spring is held between the flange and the upper wall of the outer cylinder.
It is preferable that the wire harness fixing part and the outer cylinder and the inner cylinder provided integrally with the clamp are formed of an elastic body made of rubber or elastomer. However, when the wire harness fixing part is a band type, the band is fastened and fixed. In order to increase the force, it is better to use a resin molded product.

The coil spring may be attached by inserting and locking the upper and lower ends of the coil spring into a fixing hole provided in the upper end wall and the flange of the outer cylinder, and a support projecting from the lower surface of the upper end wall of the outer cylinder and the upper surface of the flange. It may be inserted and locked in a locking hole provided in the pin.
Alternatively, a locking portion is provided at the upper end of the inner cylinder, and a locking hole for inserting and locking the locking portion is provided in the upper wall of the outer cylinder, so that the outer cylinder can be moved and connected to the inner cylinder. If the coil spring is inserted between the upper end wall of the outer cylinder and the flange, the coil spring can be held without being locked to the outer cylinder and the flange.

As described above, the clamp according to the present invention is engaged with the stud bolt or the engagement hole provided on the engine or the vehicle body side where vibration is generated.
The clamp fixing part to the wire harness may be either a band type that wraps and fastens the band around the wire harness or a substrate type that is fixed to the wire harness with tape. In the case of the band type, the box part provided with a band locking part In the case of a board type, the vibration absorbing portion is integrally projected on the board.
As described above, the vibration absorbing portion has a coil spring interposed between the inner tube and the outer tube protruding from the wire harness fixing portion.
With this configuration, when vibration is generated on the engine or the vehicle body side, the vibration is transmitted to the inner cylinder, but the vibration is attenuated by the coil spring, and the vibration transmitted to the outer cylinder integrated with the wire harness fixing portion can be significantly attenuated. it can.

Moreover, this invention provides the vehicle wiring structure of the wire harness using the said clamp. The wire harness that is fixed via the clamp has a wire harness arranged between a first fixed body made of a vehicle body and a second fixed body that is fixed to the vehicle body and generates vibrations different from the vehicle body. The cord is fixed to at least one of the first and second fixed bodies using the clamp.
It is most preferably used when vibrations having different frequencies are generated in the first and second fixed bodies.
In addition, it is preferable to fix the wire harness to be routed by using the clamp of the present invention to both the first and second fixed bodies.

  Specifically, the second fixed body is an engine body, and is most preferably used for fixing a wire harness routed over a space between the vehicle body and the engine body.

  As described above, the clamp for a wire harness according to the present invention includes an outer cylinder that projects integrally with the wire harness fixing portion, and an inner cylinder that is provided with a locking portion between the vehicle body or a fixed body fixed to the vehicle body. Because the coil spring is interposed between them, the vibration generated in the fixed body is transmitted to the inner cylinder of the clamp, but since the vibration is attenuated by the coil spring, the vibration transmitted to the outer cylinder integrated with the wire harness fixing part is greatly increased. Can be attenuated. As a result, since the vibration applied to the wire harness can be reduced, the fatigue and damage of the wire harness can be prevented. In addition, since the vibration damping factor of the coil spring used in the present invention is larger than the vibration damping factor obtained by using the rubber material of Patent Document 1, even if a large vibration occurs on the fixed body side, the vibration is reliably damped. be able to.

It is drawing which shows the wiring of the wire harness which attached the clamp of 1st embodiment of this invention. The said clamp is shown, (A) is a front view, (B) is a top view. It is an expanded sectional view of the clamp. It is sectional drawing which shows 2nd embodiment. (A)-(D) are drawings which show a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment.
As shown in FIG. 1, a wire harness 3 is routed over a space between a first fixed body 1 made of an engine mounted on an automobile and a second fixed body 2 made of a vehicle body panel constituting an engine room. Yes. The clamp 10 of the present invention is attached to the wire harness 3, and the clamp 10 is fixed to stud bolts 4, 4 protruding from the first and second fixed bodies 1, 2.

  The clamp 10 of the first embodiment is a resin molded product, and as shown in FIGS. 2 and 3, the wire harness fixing portion 11 is a band type. That is, one end of the band 12 wound around the wire harness 3 is protruded from the box 13, and the other end of the band 12 wound around the wire harness 3 is passed through the through hole 13a provided in the box 13, and protrudes from the inner surface of the through hole 13a. The provided locking piece 13b is locked and fastened in a locking groove 12a provided in the band 12.

An outer cylinder 16 constituting the vibration absorbing portion 15 is integrally provided on the outer surface of the box 13 opposite to the band winding side.
The outer cylinder 16 includes an upper wall 16a and a peripheral wall 16b, and is formed of a cylinder whose upper end is closed and whose lower end is opened. A through hole 16c is provided at the center of the upper wall 16a.
An inner cylinder 17 that is fitted in the outer cylinder 16 with a gap is provided. The inner cylinder 17 is provided with a locking piece 17a projecting on the inner peripheral surface of the inner cylinder 17 to be engaged with the groove 4b of the outer peripheral screw 4a of the stud bolt 4. An outward retaining piece 17b is provided at the upper end of the inner cylinder 17, and the retaining piece 17b passes through the through hole 16c of the outer cylinder upper wall 16a and is locked to the outer periphery of the through hole 16c.
In addition, a flange 17 c is provided on the outer periphery of the lower end of the inner cylinder 17.

  A coil spring 20 is accommodated in an annular space 18 sandwiched between the outer peripheral surface of the inner cylinder 17 and the inner peripheral surface of the outer cylinder 16, and the upper end of the coil spring 20 is pressed against the lower surface of the outer cylinder upper wall 16a. Is pressed against the upper surface of the flange 17c.

  The clamp 10 having the above-described configuration is formed by winding the band 12 of the wire harness fixing portion 11 around the outer periphery of the wire harness 3 and then passing it through the through hole 13a of the box portion 13 and locking it with the locking piece 13b. 3 is fastened with a band.

As shown in FIG. 1, the wire harness 3 in which the clamps 10 are attached in advance with a predetermined interval is arranged, as shown in FIG. 1, the first fixed body 1 made of an engine and the second fixed body 2 made of a vehicle body. It is routed between.
At that time, the inner cylinder 17 of the clamp 10 is externally fitted to the stud bolt 4 protruding from the first and second fixed bodies 1 and 2, and the locking piece 17 a protruding from the inner surface of the inner cylinder 17 is attached to the stud. The bolt 4 is inserted and locked in the groove portion of the outer peripheral screw.

When the automobile travels, the engine driving vibration is generated in the first stationary body 1 made of the engine, and the traveling vibration is generated in the second stationary body 2 made of the vehicle body. The vibration frequency of the engine driving vibration of the first fixed body 1 and the traveling vibration of the second fixed body 2 are different. Therefore, vibrations of different frequencies are transmitted from the first fixed body 1 and the second fixed body 2 to the wire harness 3 that is routed between the first and second fixed bodies 1 and 2, so that the wire harness 3 moves relatively. Will occur.
However, in the clamp 10, the vibration transmitted to the inner cylinder 17 is attenuated by the coil spring 20, and the vibration transmitted to the outer cylinder 16 can be greatly attenuated. Therefore, the vibration transmitted to the wire harness 3 through the wire harness fixing part 11 provided integrally with the outer cylinder 16 can be greatly reduced, the relative movement generated in the wire harness can be suppressed, and the fatigue and damage of the wire harness can be suppressed. Can be prevented.

A spring receiving support pin protrudes from the upper wall of the outer cylinder and the flange of the inner cylinder, both ends of the coil spring 20 are locked to the support pins, and the outer cylinder and the inner cylinder are connected by the coil spring 20. You may connect.
Moreover, in the said embodiment, although the wire harness fixing | fixed part is made into a band fastening type to a clamp, it is set as the board | substrate type | mold type provided with the board | substrate which winds and fixes a tape around a wire harness, and this board | substrate is provided with the said outer cylinder and an inner cylinder. Alternatively, it may be formed integrally with the outer surface of the outer cylinder of the vibration absorber.

FIG. 4 shows a clamp 10A according to the second embodiment.
The difference from the clamp 10 of the first embodiment is that the locking configuration with the second fixed body 30 made of the vehicle body panel is changed, and the locking is performed by inserting and locking into the locking holes 31 provided in the second fixed body 30. A blade 35 is provided at the lower end of the inner cylinder 17.
That is, a bottom plate portion 36 that closes the lower end of the inner cylinder 17 is provided, a portion of the bottom plate portion 36 that protrudes from the outer periphery of the inner cylinder 17 is a flange portion 36 a, and the locking blade 35 is provided at the center of the bottom plate portion 36. It protrudes downward. The locking blade 35 projects the blade portion 35b in a folded shape from both lower ends of the shaft portion 35a protruding from the bottom plate portion 36, and is provided with a locking step portion 35c at the tip of the blade portion 35b. The blade portion 35 b is pushed into the locking hole 31 of the second solid body 30, and the locking step portion 35 c is locked and fixed to the periphery of the locking hole 31.

The configuration in which the coil spring 20 is attached between the flange portion 36a of the bottom plate portion 36 and the upper wall of the outer cylinder 16 is the same as in the first embodiment.
Since other configurations are the same as those of the first embodiment, the same reference numerals are given and the description thereof is omitted.
The first fixed body may be provided with a locking hole, and the clamp locked to the first fixed body may be locked with the same locking blade as in FIG. It is good also as a structure latched to a volt | bolt.

  Even when the clamp 10A of the second embodiment is used, the vibration generated in the second fixed body 30 can be absorbed by the coil spring 17, and the vibration transmitted to the wire harness can be attenuated.

1 First fixed body (engine)
2, 30 Second fixed body (vehicle body)
DESCRIPTION OF SYMBOLS 3 Wire harness 4 Stud bolt 10 Clamp 11 Wire harness fixing part 12 Band 13 Box 15 Vibration absorption part 16 Outer cylinder 17 Inner cylinder 17a Locking piece 17c Flange 20 Coil spring 31 Locking hole 35 Locking blade

Claims (5)

A clamp attached to a wire harness and attached to a fixed body via a locking portion,
An outer cylinder integrally projecting on the wire harness fixing portion; an inner cylinder provided with the locking portion; and a coil spring disposed between the inner cylinder and the outer cylinder; A clamp for a wire harness, characterized by dampening a vibration to be applied.   The inner cylinder protrudes from the inner peripheral surface with a locking claw that is fitted and locked to a stud bolt protruding from the fixed body, or a locking blade that is inserted and locked into a locking hole provided in the fixed body. The clamp for wire harnesses of Claim 1 which protrudes in the lower end part. The outer cylinder is integrally protruded from a box part of a band clamp to be wound and fastened to the wire harness or to a board of a board type clamp to be attached by tape winding to the wire harness,
Protruding a flange at the lower end of the inner cylinder of the vibration absorbing portion,
The clamp for a wire harness according to claim 1 or 2, wherein the coil spring is held between a flange at a lower end of the inner cylinder and an upper wall of the outer cylinder.   A wire harness is routed between a first fixed body made of a vehicle body and a second fixed body that is fixed to the vehicle body and generates vibrations different from the vehicle body. The vehicle wiring structure of the wire harness which has attached the clamp of any one of Claim 1 thru | or 3 to at least one of the fixing locations to a 2 fixed body.   The wire harness vehicle routing structure according to claim 4, wherein the second fixed body is an engine body, and the wire harness is routed in a space between the vehicle body and the engine body.

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