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 technology]

[0002] Conventionally known examples of working vehicles include hydraulic excavators and track loaders, each of which has 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 upper body and operated by hydraulic pressure (i.e., hydraulic oil at a predetermined pressure).

[0003] The above-mentioned work vehicles are equipped with various electric and electronic devices, which are electrically connected to one another by wire harnesses (see Patent Document 1: JP 2018-174021 A).

[0004] In a work vehicle, a through hole is generally formed in a frame, a partition plate, or the like, and a wire harness is routed through the through hole. A protective member (grommet, trim, etc.) is attached to the periphery of the through hole to protect the wire harness from the edge 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 formed in a floor plate 102 that forms the floor surface of the driver's cab, and a wire harness 100 is inserted through the through hole 102a. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-174021 Summary of the Invention [Problem 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 sway due to vibrations during work, etc., or sag due to its own weight, which could cause it to interfere with and damage (or cause damage to) other components inside the vehicle body. [Means for solving the problem]

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a wire harness fixing structure that can fix a wire harness to a grommet and prevent the wire harness from swinging due to vibrations during work, etc., or from sagging due to its own weight.

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

[0009] A wire harness fixing structure according to one embodiment is a wire harness fixing structure for fixing a wire harness inserted into a through hole provided in an inserted body to a grommet attached to a periphery of the through hole, the grommet having an insertion portion through which the wire harness can be inserted. At the same time, the retainer plate is pressed down, and the retainer plate is attached to the inserted body. The wire harness is fixed to the grommet by fastening the tubular portion with a cable tie while the wire harness is inserted into the insertion portion.

[0010] According to the above configuration, the wire harness can be fixed to the grommet by the cable tie, which prevents the wire harness from swinging due to vibrations during work or sagging due to its own weight.

[0011] It is also preferable that the pressure plate has an opening through which the wire harness can pass in a direction parallel to the plate surface, the grommet has a slit through which the insertion portion can be opened from the outer periphery, and the slit is formed from the insertion portion toward the outer periphery at the position where the pressure plate abuts.

[0012] Preferably, the pressing plate has an opening through which the wire harness can pass in a direction parallel to a plate surface, and is bent to form an L-shape in a side view.

[0013] It is also preferable that the grommet has a plurality of the insertion portions and slits that can open the insertion portions from the outer periphery, and that adjacent slits are formed in opposite directions.

[0014] Furthermore, it is preferable that the tubular portion has a fastening portion that serves as a fastening position for the cable tie, and that the fastening portion has a shape in which the outer diameter of a portion of the tubular portion is reduced in the axial direction.

[0015] It is also preferable that the tightening portion has a stepped shape with a reduced diameter.

[0016] Furthermore, it is preferable that 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 that the wire harness is positioned and fixed relative to the grommet by inserting the small diameter portion so that it is positioned in the insertion portion and tightening the tightening portion with the cable tie.

[0017] It is also preferable that the small diameter portion has a shape in which the diameter is reduced in a step shape from the large diameter portion.

[0018] Preferably, the grommet has a plate-like portion capable of covering the through hole, and a fitting portion formed on the plate-like portion and capable of fitting into the through hole. [Effects of the Invention]

[0019] According to the wire harness fixing structure of one embodiment, the wire harness can be fixed to the grommet, and the wire harness can be prevented from swinging due to vibrations during work or from sagging due to its own weight. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view showing an example of a work vehicle according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the wire harness fixing structure in the work vehicle of FIG. [Figure 3] FIG. 3 is an enlarged perspective view of the wire harness fixing structure shown in FIG. [Figure 4] FIG. 4 is a schematic diagram (rear view) of the wire harness fixing structure, with the floor plate not shown. [Figure 5] FIG. 5 is a perspective view of the floor plate. [Figure 6] 6A and 6B are perspective views of the grommet from above and below the right front portion, respectively. [Figure 7] FIG. 7 is a perspective view of the pressing plate. [Figure 8] FIG. 8 is a cross-sectional view showing a conventional wire harness insertion structure. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment 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 a wire harness fixing structure according to an embodiment of the present invention is applied. For convenience of explanation, arrows may be used in the drawings to indicate up / down, left / right, and front / rear directions. In addition, in all drawings used to explain the embodiment, members having the same function are given the same reference numerals, and repeated explanations thereof may be omitted.

[0022] The wire harness fixing structure according to this embodiment is a structure in which a wire harness 30 inserted into a through hole 24a provided in a floor plate (inserted body) 24 of a vehicle 1 is fixed to a grommet 70 attached to the periphery of the through hole 24a. Note that, although the description will be given taking a work vehicle (for example, a hydraulic excavator) 1 as an example of the vehicle 1, the vehicle 1 is not limited to this.

[0023] First, as shown in FIG. 1, the work vehicle (hydraulic excavator) 1 has a vehicle body consisting of a lower body 2 and an upper body 3 disposed on top of the lower body 2 (note that the lower body 2 and the upper body 3 may be integrally configured).

[0024] The work vehicle 1 also includes working devices 12, 14 that are attached to the lower body 2 and upper body 3 and are operated by hydraulic pressure (hydraulic oil at a predetermined pressure). The lower body 2 includes a traveling device 10 that allows the vehicle to travel. The upper body 3 includes a main body frame 22 at its lower part. The work vehicle also includes a cab 16 at the front where an operator rides to operate the vehicle and perform operations. The work vehicle also includes a floor plate 24 that forms the floor surface of the cab 16. Here, Figure 5 is a perspective view of the floor plate 24 from above the left front part.

[0025] An example of the traveling device 10 includes a pair of left and right crawlers 26 driven by a traveling hydraulic motor 28. Note that the crawlers 26 may be replaced with tires (not shown).

[0026] An example of the working implement 12 is provided with a blade 40 driven by a hydraulic cylinder 50. An example of the working implement 14 is provided with a boom 42, an arm 44, and a detachable attachment 46, which are driven by hydraulic cylinders 52, 54, and 56, respectively. Note that, although a bucket is shown as an example of the attachment 46, the present invention is not limited to this.

[0027] The work vehicle 1 is also equipped with electrical and electronic devices such as electrical equipment such as an air conditioner and an engine starter, and control devices such as a controller and various switches (none of which are shown). These electrical and electronic devices are electrically connected to one another via a wire harness 30. In this embodiment, the wire harness 30 includes wire harnesses 30A, 30B, and 30C. The wire harness 30 is routed between the interior and exterior of the cab 16 through a through-hole 24a provided in the floor plate 24.

[0028] Next, the wire harness fixing structure according to this 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 without showing the floor plate 24.

[0029] 2 and 3, the wire harness fixing structure according to this embodiment includes a grommet 70 attached to the periphery of the through-hole 24a. Fig. 6A is a perspective view of the grommet 70 from above the right front part. Fig. 6B is a perspective view of the grommet 70 from below the right front part.

[0030] As shown in Figures 6A and 6B, grommet 70 has a main body portion 72 that can close through hole 24a and an insertion portion 76 that can insert wire harness 30, and is integrally molded using an elastic material (preferably rubber or elastomer).

[0031] As an example, the main body portion 72 has a plate-shaped portion 73 that is molded to be able to cover the through hole 24a, and an engaging portion 74 that is erected on one side of the plate-shaped portion 73 (in this embodiment, the lower side) and can be engaged with the through hole 24a.

[0032] The insertion portion 76 has an insertion hole 78 provided in the main body portion 72 and a tubular portion 80 erected from the periphery of the insertion hole 78 to the other surface side (the upper surface side in this embodiment) of the plate-like portion 73 (however, the tubular portion 80 may be erected to the lower surface side (i.e., the fitting portion 74)). The insertion hole 78 and the tubular portion 80 are open continuously, and are configured to allow the wire harness 30 to be inserted therethrough. In this embodiment, the insertion portion 76 has insertion portions 76A, 76B, and 76C corresponding to the wire harnesses 30A, 30B, and 30C (however, this can be changed as appropriate depending on the number of wire harnesses 30 (the number may be one, or two or more than three)).

[0033] The tubular portion 80 is a portion that fixes the wire harness 30. Specifically, as shown in Fig. 4, with the wire harness 30 inserted into the insertion portion 76, the outer periphery of the tubular portion 80 is fastened with a cable tie 94, thereby deforming the tubular portion 80 and fixing the wire harness 30 to the grommet 70. The cable tie 94 is a common type and will not be described in detail, but a flexible band portion is inserted into a lock portion formed at the base end of the band portion, thereby restricting movement of the band portion in the removal direction.

[0034] The above configuration realizes a structure for fixing the wire harness 30 to the grommet 70 (in other words, a structure for fixing the wire harness 30 at a predetermined position via the grommet 70). This prevents the wire harness 30 from swinging due to vibrations during work or sagging due to its own weight.

[0035] In the conventional wire harness insertion structure shown in Fig. 8, a gap is generated between the wire harness 100 and the protective member 104, which allows dust to enter the cab and reduces the effectiveness of the air conditioner. To address these issues, the grommet 70 according to this embodiment is attached to the floor plate 24 with the fitting portion 74 fitted into the through-hole 24a and the plate-like portion 73 positioned to cover the through-hole 24a (the details of the attachment will be described later). In addition, the wire harness 30 and the tubular portion 80 are fixed in close contact with each other by a cable tie 94. This makes it possible to reliably close the through-hole 24a, thereby solving the above-mentioned issues.

[0036] As an example, the tubular portion 80 has a fastening portion 80a that serves as a fastening position for the cable tie 94, and the fastening portion 80a has a shape in which the outer diameter of a portion of the tubular portion 80 is reduced in the axial direction. This makes it easier to visually check the fastening position of the cable tie 94. Also, the fastening portion 80a is thin, making it easier to deform.

[0037] The fastening portion 80a has a stepped shape with a reduced diameter. This makes it easier to visually check the fastening position of the cable tie 94. It also prevents the cable tie 94 from shifting in the axial direction of the tubular portion 80. In this embodiment, the portion excluding the tip and base ends of the tubular portion 80 is provided as the fastening portion 80a, but it is sufficient that the fastening portion 80a is long enough to wrap the cable tie 94 (longer than the width of the cable tie 94).

[0038] Here, in the above-described wire harness fixing structure, a problem may arise in that the fixing position of the wire harness 30 relative to the grommet 70 (tubular portion 80) is not determined. To address this problem, the wire harness 30 according to the present embodiment is provided with the following configuration to solve the problem. Specifically, the wire harness 30 has a small diameter portion 30a in which a plurality of electric wires are bundled together (or may be configured as a single electric wire) and covered with tape or the like, and a large diameter portion 30b in which the outer periphery of the small diameter portion 30a is further covered with a protective member (for example, a corrugated tube or the like). That is, the small diameter portion 30a is formed so as to have a relatively small outer diameter, and the large diameter portion 30b is formed so as to have a relatively large outer diameter.

[0039] 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 fastening the fastening portion 80a with the cable tie 94 while the small diameter portion 30a is inserted so as to be positioned in the insertion portion 76. This allows the wire harness 30 to be accurately positioned and fixed to the grommet 70.

[0040] The small diameter portion 30a is stepped down from the large diameter portion 30b, making it easy to visually check the fastening position of the binding band 94.

[0041] Furthermore, 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. As a result, even if the cable tie 94 becomes loose, the large diameter portion 30b abuts against the end of the insertion portion 76, preventing the wire harness 30 from shifting.

[0042] Additionally, grommet 70 has slits 84 (84A, 84B, 84C) that can open insertion portion 76 from the outer periphery. As a result, slits 84 can be widened from the outer periphery of grommet 70 to open insertion portion 76, so that small diameter portion 30a can be inserted into insertion portion 76 with pinpoint precision, regardless of the presence or absence of the above-described large diameter portion 30b or branch (branch portion 32, as an example).

[0043] The grommet 70 with the wire harness 30 inserted therethrough is attached to the floor plate 24 by, for example, a presser plate 90 and a fixing member (for example, a bolt) 92. The presser plate 90 is a plate-like member that abuts against the upper surface of the main body 72 to hold the grommet 70 against the floor plate 24, and is formed using a metal material. As shown in FIG. 7 , the presser plate 90 is formed to be U-shaped in a plan view, and has an opening 90a that allows the wire harness 30 to pass through in a direction parallel to the plate surface. This allows the presser plate 90 to be placed over the grommet 70 with the wire harness 30 inserted therethrough. The presser plate 90 is also formed by being bent to be L-shaped in a side view, and is positioned relative to the grommet 70 by abutting a bent portion 90b against a corner of the main body 72.

[0044] The slits 84 are formed from the insertion portion 76 toward the outer periphery at the position where the pressure plate 90 abuts. This allows the tip of the slit 84 to be pressed down by the pressure plate 90, preventing the slit 84 from opening. Here, the slit 84A is formed from the insertion portion 76A toward the rear, the slit 84B is formed from the insertion portion 76B toward the front, and the slit 84C is formed from the insertion portion 76C toward the rear. In other words, the slit 84 (for example, the slit 84B) is formed in the opposite direction to the adjacent slits 84 (the slits 84A and 84C) in the longitudinal direction of the grommet 70. This maintains the spacing between the slits 84, improving the durability of the grommet 70.

[0045] In the above-described wire harness fixing structure, a process of fixing the wire harness 30 to the grommet 70 will be described.

[0046] 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.

[0047] Next, grommet 70 is fixed to floor plate 24. Specifically, after fitting fitting portion 74 into through hole 24a, presser plate 90 is placed on the upper surface of main body portion 72, and fixing member 92 is inserted (screwed) through fixing hole 90c provided in presser plate 90, fixing hole 82 provided in grommet 70, and mounting portion (fixing hole) 24b formed in floor plate 24.

[0048] Next, the wire harness 30 is fixed to the grommet 70. Specifically, the outer periphery of the fastening portion 80a is fastened with a cable tie 94. This completes the process of fixing the wire harness 30 to the grommet 70.

[0049] As described above, according to the wire harness fixing structure, the wire harness can be fixed to the grommet, and the wire harness can be prevented from swinging due to vibrations during work or from sagging due to its own weight.

[0050] The wire harness fixing structure of the present invention is not limited to being applied to the floor plates of work vehicles, but can also be applied to other vehicles (passenger vehicles such as automobiles, commercial vehicles such as trucks), as well as any structure in which a wiring member is inserted into a through hole provided in an inserted body. [Explanation of symbols]

[0051] 1. Work vehicles 24 floor plate 24a through hole 30, 30A, 30B, 30C Wire Harness 70 Grommet 76, 76A, 76B, 76C Insertion parts 78 Insertion hole 80 Cylinder part 94 Cable ties

Claims

1. A wire harness fixing structure for fixing a wire harness inserted into a through hole provided in an insertion target body to a grommet attached to a periphery of the through hole, The grommet has an insertion portion through which the wire harness can be inserted, and is attached to the insertion target by being pressed by a pressing plate, the insertion portion has an insertion hole and a tubular portion erected from a periphery of the insertion hole, With the wire harness inserted into the insertion portion, the tubular portion is fastened with a cable tie, thereby fixing the wire harness to the grommet. A wire harness fixing structure characterized by the above.

2. The holding plate has an opening through which the wire harness can pass in a direction parallel to the plate surface, The grommet has a slit that can open from an outer periphery to the insertion portion, The slit is formed from the insertion portion toward the outer periphery at the position where the pressing plate abuts.

2. The wire harness fixing structure according to claim 1, wherein:

3. The holding plate has an opening through which the wire harness can pass in a direction parallel to the plate surface, and is bent to form an L-shape in a side view.

2. The wire harness fixing structure according to claim 1, wherein:

4. The grommet has a plurality of the insertion portions and has slits that can open the insertion portions from the outer periphery, The slits are formed so that adjacent slits are in opposite directions.

4. The wire harness fixing structure according to claim 3, wherein:

5. The cylindrical portion has a fastening portion that serves as a fastening position for the binding band, The tightening portion has a shape in which the outer diameter of a part of the cylindrical portion is reduced in the axial direction. The wire harness fixing structure according to any one of claims 1 to 4, characterized in that:

6. The tightening portion has a stepped shape with a reduced diameter.

6. The wire harness fixing structure according to claim 5,

7. The wire harness has a small diameter portion having a relatively small outer diameter and a large diameter portion having a relatively large outer diameter, The wire harness is positioned and fixed to the grommet by fastening the fastening portion with the binding band while the small diameter portion is inserted into the insertion portion.

6. The wire harness fixing structure according to claim 5,

8. The small diameter portion has a stepped shape that reduces in diameter from the large diameter portion.

8. The wire harness fixing structure according to claim 7, wherein:

9. The grommet has a plate-like portion capable of covering the through hole, and a fitting portion formed on the plate-like portion and capable of fitting into the through hole. The wire harness fixing structure according to any one of claims 1 to 4, characterized in that:

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