Wire harness fixing structure

Abstract

To provide a wire harness fixing structure that fixes wire harnesses to a grommet to prevent trembling of the wire harnesses due to vibration during work or the like, and sagging due to their own weight.SOLUTION: In a wire harness fixing structure for fixing wire harnesses 30 inserted into a through hole 24a provided on a to-be-inserted body 24, to a grommet 70 attached on a peripheral edge of the through hole 24a, the grommet 70 has insertion parts 76 into which the wire harnesses 30 can be inserted. The insertion parts 76 have insertion holes 78 and cylindrical parts 80 erected from peripheral edges of the insertion holes 78. The wire harnesses 30 are fixed to the grommet 70 by fastening the cylindrical parts 80 with cable ties 94 in a state in which the wire harnesses 30 are inserted into the insertion parts 76.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a wire harness fixing structure.

Background Art

[0002] Examples of work vehicles include hydraulic excavators, wheel loaders, etc. that include a lower body to which crawlers or tires for traveling are attached, an upper body disposed on the lower body, and a working device attached to the lower body or the upper body and operated by hydraulic pressure (i.e., hydraulic oil at a predetermined pressure), which have been conventionally known.

[0003] The above-described work vehicles are equipped with various electrical and electronic devices, and these electrical and electronic devices are electrically connected to each other by a wire harness (see Patent Document 1: Japanese Unexamined Patent Application Publication No. 2018-174021).

[0004] In work vehicles, it is common to provide through holes in frames, partition plates, etc., and route the wire harness through the through holes. And a protective member (such as a grommet or trim) for protecting the wire harness is attached to the periphery of the through hole. FIG. 8 is a cross-sectional view showing a conventional example, in which a protective member 104 is attached to the periphery of a through hole 102a provided in a floor plate 102 constituting the floor surface of the cab, and a wire harness 100 is inserted therethrough.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the above configuration, since the wire harness is not fixed to the protective member, the wire harness may swing due to vibrations during work or the like, or may sag due to its own weight, interfering with other members inside the vehicle body and causing damage (or causing damage).

Means for Solving the Problem

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a wire harness fixing structure capable of fixing a wire harness to a grommet to prevent the wire harness from swinging due to vibrations during work or the like and sagging due to its own weight.

[0008] The present invention solves the above problems by means of the following solutions described below as one embodiment.

[0009] A wire harness fixing structure according to an embodiment is a wire harness fixing structure that fixes a wire harness inserted through a through hole provided in an insertion body to a grommet attached to the periphery of the through hole, wherein the grommet has an insertion portion through which the wire harness can be inserted, the insertion portion has an insertion hole and a cylindrical portion erected from the periphery of the insertion hole, and in a state where the wire harness is inserted through the insertion portion, the wire harness is fixed to the grommet by tightening the cylindrical portion with a binding band.

[0010] According to the above configuration, the wire harness can be fixed to the grommet by a binding band. Therefore, it is possible to prevent the wire harness from swinging due to vibrations during work or the like and sagging due to its own weight.

[0011] Further, the cylindrical portion preferably has a tightening portion that becomes a tightening position of the binding band, and the tightening portion preferably has a shape in which the outer diameter of a part of the cylindrical portion is reduced in the axial direction.

[0012] Further, the tightening portion preferably has a shape in which the diameter is reduced stepwise.

[0013] Further, the wire harness has a small-diameter portion with a relatively small outer diameter and a large-diameter portion with a relatively large outer diameter. With the small-diameter portion inserted into the insertion portion, it is preferable that the fastening portion is fastened by the binding band so that the wire harness is positioned and fixed with respect to the grommet.

[0014] Also, it is preferable that the small-diameter portion has a shape in which the diameter is reduced stepwise from the large-diameter portion.

[0015] Also, it is preferable that the grommet has a plate-shaped portion capable of covering the through-hole and a fitting portion formed on the plate-shaped portion and capable of fitting into the through-hole.

[0016] Also, the grommet is attached to the object to be inserted by being held by a holding plate, and it is preferable that the holding plate has an opening through which the wire harness can pass in a direction parallel to the plate surface.

[0017] Also, the grommet has a slit capable of opening the insertion portion from the outer periphery, and it is preferable that the slit is formed from the insertion portion toward the outer periphery at a position where the holding plate abuts.

Advantages of the Invention

[0018] According to the wire harness fixing structure according to one embodiment, the wire harness can be fixed to the grommet to prevent the wire harness from swaying due to vibration during work or sagging due to its own weight.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of a vehicle 1 to which the wire harness fixing structure according to the embodiment of the present invention is applied. For convenience of explanation, in the drawings, the directions of up and down, left and right, and front and back may be indicated by arrows. In all the drawings for explaining the embodiments, members having the same function are denoted by the same reference numerals, and repeated explanations thereof may be omitted.

[0021] The wire harness fixing structure according to the present embodiment is a structure for fixing a wire harness 30 inserted through a through hole 24a provided in a floor plate (member to be inserted) 24 of the vehicle 1 to a grommet 70 attached to the periphery of the through hole 24a. Note that, although the work vehicle (for example, a hydraulic excavator) 1 is taken as an example of the vehicle 1 for explanation, the present invention is not limited thereto.

[0022] First, as shown in FIG. 1, the work vehicle (hydraulic excavator) 1 includes a lower body 2 as a vehicle body and an upper body 3 disposed on the lower body 2 (note that the lower body 2 and the upper body 3 may be integrally formed).

[0023] In addition, the work vehicle 1 is equipped with working devices 12 and 14 that are attached to the lower body 2 and the upper body 3 and operate by hydraulic pressure (hydraulic oil at a predetermined pressure). The lower body 2 is equipped with a traveling device 10 for traveling. The upper body 3 is equipped with a main body frame 22 at the lower part. Also, at the front part, there is a driver's cab 16 where an operator rides to perform operations such as traveling and working. Further, it is equipped with a floor plate 24 that constitutes the floor surface of the driver's cab 16. Here, FIG. 5 is a perspective view from above the upper left front part of the floor plate 24.

[0024] As an example of the traveling device 10, it is equipped with a pair of left and right crawlers 26 driven by a traveling hydraulic motor 28. Note that, instead of the crawlers 26, a configuration with tires may be adopted (not shown).

[0025] As an example of the working device 12, it is equipped with an earth discharge plate 40 driven by a hydraulic cylinder 50. Also, as an example of the working device 14, it is equipped with a boom 42, an arm 44, and a detachable attachment 46 respectively driven by hydraulic cylinders 52, 54, and 56. Note that, as the attachment 46, a state where a bucket is attached is illustrated, but it is not limited thereto.

[0026] In addition, the work vehicle 1 is equipped with electrical and electronic devices such as electrical components such as an air conditioner and an engine starter, and control devices such as a controller and various switches (none of which are shown). The electrical and electronic devices are electrically connected to each other via a wire harness 30. In the present embodiment, as the wire harness 30, wire harnesses 30A, 30B, and 30C are provided. The wire harness 30 is routed through a through hole 24a provided in the floor plate 24 to cross between the inside and outside of the driver's cab 16.

[0027] Next, the wire harness fixing structure according to the present embodiment will be described. FIG. 2 is a perspective view showing the wire harness fixing structure in the work vehicle 1 of FIG. 1. FIG. 3 is an enlarged perspective view of the wire harness fixing structure shown in FIG. 2. FIG. 4 is a schematic view (rear view) of the wire harness fixing structure with the floor plate 24 not shown.

[0028] As shown in FIGS. 2 and 3, the wire harness fixing structure according to the present embodiment includes a grommet 70 attached to the periphery of the through hole 24a. Here, FIG. 6A is a perspective view of the grommet 70 from above the upper right front portion. FIG. 6B is a perspective view of the grommet 70 from below the upper right front portion.

[0029] As shown in FIGS. 6A and 6B, the grommet 70 has a main body portion 72 capable of closing the through hole 24a and an insertion portion 76 through which the wire harness 30 can be inserted, and is integrally formed using an elastic material (preferably rubber or elastomer).

[0030] As an example, the main body portion 72 has a plate-like portion 73 formed to cover the through hole 24a and a fitting portion 74 standing on one surface side (the lower surface side in the present embodiment) of the plate-like portion 73 and capable of fitting into the through hole 24a.

[0031] The insertion portion 76 has an insertion hole 78 provided in the main body portion 72 and a cylindrical portion 80 standing from the periphery of the insertion hole 78 to the other surface side (the upper surface side in the present embodiment) of the plate-like portion 73 (however, the cylindrical portion 80 may be configured to stand on the lower surface side (that is, the fitting portion 74)). The insertion hole 78 and the cylindrical portion 80 are continuously open and are configured to allow the wire harness 30 to be inserted. In the present embodiment, the insertion portion 76 includes insertion portions 76A, 76B, and 76C corresponding to the wire harnesses 30A, 30B, and 30C (however, it can be appropriately changed according to the number of wire harnesses 30 (it may be a single one, or two or more than four)).

[0032] The cylindrical portion 80 is a part for fixing the wire harness 30. Specifically, as shown in FIG. 4, with the wire harness 30 inserted into the insertion portion 76, the outer circumference of the cylindrical portion 80 is tightened by the binding band 94, thereby deforming the cylindrical portion 80 to fix the wire harness 30 to the grommet 70. Since the binding band 94 is a common one, it will not be described in detail, but it has a flexible band portion that is inserted into a locking portion formed at the proximal end of the band portion, so that movement of the band portion in the removal direction is restricted.

[0033] With the above configuration, a structure for fixing the wire harness 30 to the grommet 70 (in other words, a structure for fixing the wire harness 30 to a predetermined position via the grommet 70) is realized. Thereby, it is possible to prevent the wire harness 30 from swaying due to vibrations during work or the like, or sagging due to its own weight.

[0034] Here, in the conventional wire harness insertion structure shown in FIG. 8, there is a problem that dust enters the driver's cab because a gap is generated between the wire harness 100 and the protective member 104, and the air conditioner does not work well. In response to this problem, in the grommet 70 according to the present embodiment, the fitting portion 74 is fitted into the through hole 24a, and the plate-like portion 73 is arranged so as to cover the through hole 24a and is attached to the floor plate 24 (details of the attachment will be described later). Further, the wire harness 30 and the cylindrical portion 80 are fixed so as to be in close contact with each other by the binding band 94. Therefore, it is possible to reliably block the through hole 24a and solve the above problems.

[0035] As an example, the cylindrical portion 80 has a tightening portion 80a that is the tightening position of the binding band 94, and the tightening portion 80a has a shape in which the outer diameter of a part of the cylindrical portion 80 is reduced in the axial direction. Thereby, it is possible to easily visually recognize the tightening position of the binding band 94. In addition, the tightening portion 80a can be made thin and easily deformed.

[0036] Further, the tightening portion 80a has a shape that is reduced in diameter in a stepped manner. This makes it easier to visually identify the tightening position of the binding band 94. Also, it is possible to suppress displacement of the binding band 94 in the axial direction of the cylindrical portion 80. In the present embodiment, the portion excluding the tip and the base end of the cylindrical portion 80 is provided as the tightening portion 80a, but it is sufficient if at least a length (equal to or greater than the width dimension of the binding band 94) where the binding band 94 can be wound is provided.

[0037] Here, in the above-described wire harness fixing structure, there may arise a problem that the fixing position of the wire harness 30 with respect to the grommet 70 (cylindrical portion 80) is not determined. To solve this problem, the wire harness 30 according to the present embodiment is configured as follows. Specifically, it has a small-diameter portion 30a formed by bundling a plurality of electric wires together (it may also be configured of a single electric wire) and covering them by taping or the like, and a large-diameter portion 30b formed by further covering the outer periphery of the small-diameter portion 30a with a protective member (as an example, a corrugated tube or the like). That is, the small-diameter portion 30a is formed so that its outer diameter becomes relatively small, and the large-diameter portion 30b is formed so that its outer diameter becomes relatively large.

[0038] The small-diameter portion 30a is set at a position where the wire harness 30 can be accurately positioned and fixed to the grommet 70 by tightening the tightening portion 80a with the binding band 94 in a state where the small-diameter portion 30a is inserted through the insertion portion 76 so as to be located therein. Thereby, the wire harness 30 can be accurately positioned and fixed to the grommet 70.

[0039] Also, the small-diameter portion 30a has a shape that is reduced in diameter in a stepped manner from the large-diameter portion 30b. This makes it easier to visually identify the tightening position of the binding band 94.

[0040] Further, the small-diameter portion 30a has an outer diameter smaller than the inner diameter of the insertion portion 76, and the large-diameter portion 30b has an outer diameter larger than the inner diameter of the insertion portion 76. Thus, even when the binding band 94 is relaxed, the large-diameter portion 30b abuts against the end of the insertion portion 76 to prevent the wire harness 30 from shifting.

[0041] Also, the grommet 70 has slits 84 (84A, 84B, 84C) that can open the insertion portion 76 from the outer periphery. Thereby, since the insertion portion 76 can be opened by widening the slit 84 from the outer periphery of the grommet 70, the small-diameter portion 30a can be inserted into the insertion portion 76 pinpointedly regardless of the presence or absence of the large-diameter portion 30b or a branch (as an example, the branch portion 32).

[0042] The grommet 70 into which the wire harness 30 is inserted is attached to the floor plate 24 by a pressing plate 90 and a fixing member (as an example, a bolt) 92. The pressing plate 90 is a plate-like member that abuts against the upper surface of the main body portion 72 to hold the grommet 70 against the floor plate 24, and is formed using a metal material. As shown in FIG. 7, the pressing plate 90 is formed in a U-shape in plan view and has an opening 90a through which the wire harness 30 can pass in a direction parallel to the plate surface. Thereby, the pressing plate 90 can be overlapped with the grommet 70 in a state where the wire harness 30 is inserted. Further, the pressing plate 90 is bent and formed in an L-shape in side view, and is positioned with respect to the grommet 70 by bringing the bent portion 90b into contact with the corner of the main body portion 72.

[0043] Then, the above-described slit 84 is formed toward the outer periphery of the position where the pressing plate 90 abuts from the insertion portion 76. Thereby, since the tip of the slit 84 can be held by the pressing plate 90, the opening of the slit 84 can be prevented. Here, the slit 84A is formed rearward from the insertion portion 76A, the slit 84B is formed forward from the insertion portion 76B, and the slit 84C is formed rearward from the insertion portion 76C. That is, the slit 84 (as an example, the slit 84B) is formed in a direction opposite to the adjacent slits 84 (the slit 84A and the slit 84C) in the longitudinal direction of the grommet 70. Thereby, the interval between the slits 84 is maintained, and the durability of the grommet 70 can be improved.

[0044] In the wire harness fixing structure described above, the step of fixing the wire harness 30 to the grommet 70 will be described.

[0045] First, the wire harness 30 is inserted into the grommet 70. Specifically, the slit 84 is opened from the outer periphery of the grommet 70 to open the insertion portion 76, and the wire harness 30 is inserted so that the small-diameter portion 30a is positioned in the insertion portion 76.

[0046] Next, the grommet 70 is fixed to the floor plate 24. Specifically, after the fitting portion 74 is fitted into the through hole 24a, the pressing plate 90 is overlaid on the upper surface of the main body portion 72, and the fixing member 92 is inserted (screwed) into the fixing hole 90c provided in the pressing plate 90, the fixing hole 82 provided in the grommet 70, and the mounting portion (fixing hole) 24b formed in the floor plate 24.

[0047] Next, the wire harness 30 is fixed to the grommet 70. Specifically, the outer periphery of the tightening portion 80a is tightened by the binding band 94. Thus, the step of fixing the wire harness 30 to the grommet 70 is completed.

[0048] As described above, according to the above wire harness fixing structure, the wire harness can be fixed to the grommet to prevent the wire harness from swaying due to vibration during work or sagging due to its own weight.

[0049] Note that the wire harness fixing structure according to the present invention is not only applicable to the floor plate of a work vehicle. It can be similarly applied not only to other vehicles (passenger vehicles such as automobiles, commercial vehicles such as trucks), but also to any structure in which a wiring member is inserted into a through-hole provided in an object to be inserted.

Explanation of reference numerals

[0050] 1 Work vehicle 24 Floor plate 24a Through-hole 30, 30A, 30B, 30C Wire harness 70 Grommet 76, 76A, 76B, 76C Insertion part 78 Insertion hole 80 Cylindrical part 94 Binding band

Claims

1. A wire harness fixed to a grommet attached to the periphery of a through hole provided in an object to be inserted, the wire harness being inserted through the through hole, characterized in that: the grommet has an insertion portion through which the wire harness can be inserted; the insertion portion has an insertion hole and a cylindrical portion erected from the periphery of the insertion hole; with the wire harness inserted through the insertion portion, the cylindrical portion is tightened by a binding band, whereby the wire harness is fixed to the grommet. A wire harness fixing structure characterized by the above.

2. The cylindrical portion has a tightening portion that is the position where the binding band is tightened, the tightening portion being shaped such that the outer diameter of a part of the cylindrical portion is reduced in the axial direction. The wire harness fixing structure according to Claim 1, characterized by the above.

3. The tightening portion is shaped such that the diameter is reduced in a stepped manner. The wire harness fixing structure according to Claim 2, characterized by the above.

4. The wire harness has a small-diameter portion with a relatively small outer diameter and a large-diameter portion with a relatively large outer diameter, and with the small-diameter portion inserted through the insertion portion so as to be positioned therein, the tightening portion is tightened by a binding band, whereby the wire harness is positioned and fixed to the grommet. The wire harness fixing structure according to Claim 2, characterized by the above.

5. The small-diameter portion is shaped such that the diameter is reduced in a stepped manner from the large-diameter portion. The wire harness fixing structure according to Claim 4, characterized by the above.

6. The grommet has a plate-shaped portion capable of covering the through hole and a fitting portion formed on the plate-shaped portion and capable of fitting into the through hole. The wire harness fixing structure according to Claim 1 or Claim 5, characterized by the above.

7. The grommet is attached to the object to be inserted by being held down by a pressing plate, the pressing plate having an opening through which the wire harness can pass in a direction parallel to the plate surface. The wire harness fixing structure according to Claim 1 or Claim 5, characterized by the above.

8. The grommet has a slit through which the insertion portion can be opened from the outer periphery, the slit being formed from the insertion portion toward the outer periphery at the position where the pressing plate abuts. The wire harness fixing structure according to Claim 7, characterized by the above. ​

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