JP2020137279A - Grommet, temporal assembling method of wire harness with the grommet to vehicle, and temporal assembling structure - Google Patents

Abstract

To enable previous rising of a wire harness so that a tip end of the wire harness does not lie down on an assembly line floor without using temporal stopping means such as a tape.SOLUTION: A tip part of a wire harness is inserted into a grommet 10 having: a large diameter part 11 fixed to a panel 110; a small diameter 12 part fixed to an outer periphery of a wire harness W; and a conical-like cylindrical wall 13 connecting the large diameter part and the small diameter part, and the small diameter part is fixed to the outer periphery of the wire harness, and the large diameter part is fixed to the panel. In such a state, the cylindrical wall on the small diameter part side is pressed to an inner peripheral side of the cylindrical wall on the large diameter part side, while curving the cylindrical wall in a cross section S-shape of an axial direction, and thereby the state is held.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for temporarily assembling a grommet and a wire harness with a grommet to a vehicle, and a temporary assembling structure.

Generally, when the auxiliary machine 107 of the vehicle 100 is in the underfloor space 120 of the floor panel 110, it is necessary to route the wire harness W through the floor panel 110 as shown in FIG. In that case, for example, the tip end side of the wire harness W connected to the vehicle-mounted power supply 105 is inserted into the underfloor space 120 from the through hole 112 of the floor panel 110 via the grommet 200. Then, in the underfloor space 120, the connector 106 attached to the tip of the wire harness W is connected to the connector 108 on the auxiliary machine 107 side.

At this time, the grommet 200 is fitted and fixed in the through hole 112 of the floor panel 110 and is fitted and fixed to the outer periphery of the wire harness W to protect the wire harness W and the floor panel penetrating portion of the wire harness W. Shield. This type of grommet 200 is known, for example, in Patent Document 1.

By the way, when manufacturing a vehicle on the assembly line, as shown in FIG. 7, if the wire harness W hangs down from the grommet 200 fixed to the floor panel 110 for a long time, the tip of the wire harness W is brought to the assembly line floor 130. It arrives, and the connector 106 and the like lie on the assembly line floor 130. Then, the connector 106 may be trampled by the feet 140 of the worker who assembles the vehicle, or the electric wires constituting the wire harness W may be damaged by dragging on the floor.

Therefore, as shown in FIG. 8, so that the tip of the wire harness W does not reach the assembly line floor 130, the wire harness W is folded back in the middle and temporarily stopped by a temporary fixing means such as tape 150. It has been. As a result, a space H having an appropriate height can be secured between the wire harness W and the assembly line floor 130, so that it is possible to prevent the connector 106 from being stepped on by a foot or the electric wire being damaged by dragging.

Japanese Unexamined Patent Publication No. 2004-166450

However, in such a method, it is necessary to fold back the wire harness W and fix it with tape 150 or the like, which makes the work process complicated. Further, when connecting the connector 106 to the mating connector 108, it is necessary to remove the tape 150, which further complicates the work process.

The present invention has been made in view of the above circumstances, and an object of the present invention is to lift the wire harness so that the tip of the wire harness does not lie on the assembly line floor without using temporary fixing means such as tape. It is an object of the present invention to provide a method for temporarily assembling a grommet, a wire harness with a grommet, and a temporary assembling structure to a vehicle, which can be stored and easily restored to the original form when necessary.

In order to achieve the above-mentioned object, the grommet, the temporary assembly structure of the wire harness with the grommet to the vehicle, and the temporary assembly structure according to the present invention are characterized by the following (1) to (4).
(1) A large-diameter portion that is fitted and fixed to the hole edge of the through hole of the panel, a small-diameter portion that is fitted and fixed to the outer periphery of a wire harness that is inserted into the through hole of the panel, and the large-diameter portion and the above. It has a conical tubular wall that connects the small diameter parts,
The tubular wall is capable of pushing the tubular wall on the small diameter portion side into the inner peripheral side of the tubular wall on the large diameter portion side while bending the tubular wall in an S-shaped cross section in the axial direction. Has rigidity that can hold the pushed state,
The grommet that is characterized by that.

(2) The tubular wall is formed between two thin portions having increased flexibility, which becomes two curved portions when the tubular wall is curved in an S-shaped axial cross section, and the two thin portions. It is located in, and has a thick part with a thicker wall thickness than the thin part to increase rigidity.
The grommet according to (1) above, characterized in that.

(3) A large diameter portion fitted and fixed to the hole edge of the through hole of the panel, a small diameter portion fitted and fixed to the outer periphery of the wire harness inserted through the through hole of the panel, the large diameter portion and the above. The tip of the wire harness is passed through a grommet having a conical tubular wall connecting the small diameter portions, and the small diameter portion of the grommet is fitted and fixed to the outer periphery of the wire harness, and the small diameter portion of the grommet is fitted into the through hole of the panel. The tip of the wire harness is inserted together with the portion, and the large diameter portion of the grommet is fitted and fixed to the hole edge of the through hole of the panel, and in that state, the tubular wall of the grommet has an S-shaped axial cross section. The tubular wall on the small diameter side was pushed into the inner peripheral side of the tubular wall on the large diameter side while being curved, and the pushed state was held by the rigidity of the grommet itself.
A method of temporarily assembling a wire harness with a grommet to a vehicle.

(4) A large diameter portion fitted and fixed to the hole edge of the through hole of the panel, a small diameter portion fitted and fixed to the outer periphery of the wire harness inserted through the through hole of the panel, the large diameter portion and the above. The wire harness is inserted through the small diameter portion of the glomet having a conical tubular wall connecting the small diameter portions, and the tubular wall on the small diameter portion side is formed on the inner peripheral side of the tubular wall on the large diameter portion side. In a state where the tubular wall is pushed in and curved in an axial cross section S-shape, the large diameter portion is fitted and fixed to the hole edge of the through hole of the panel, and the curved state is caused by the rigidity of the grommet itself. Was retained,
Temporarily assembled structure of wire harness with grommet to the vehicle.

According to the grommet having the configuration of (1) above, the length from the large diameter portion to the small diameter portion is shortened by pushing the tubular wall on the small diameter portion side into the inner peripheral side of the tubular wall on the large diameter portion side. be able to. Therefore, the position of the wire harness fitted to the small diameter portion can be moved closer to the position close to the large diameter portion. For example, when the tip of the wire harness fitted and fixed to the small diameter portion is hung below the floor panel while the large diameter portion is fitted and fixed to the through hole of the floor panel of the vehicle, the wire that hangs below the floor panel. You can lift the harness. In addition, the grommet can hold the pushed state with its own rigidity. Therefore, even if a special temporary fixing means such as tape is not used, the tip of the wire harness can be kept lifted only by the grommet so that the tip of the wire harness does not lie on the assembly line floor. can do. In addition, when connecting the tip of the wire harness to any of the connection destinations, the tubular wall on the small diameter side can be pulled out from the pushed state by simply pulling the tip of the wire harness strongly, and the grommet can be pulled out to the normal length. It can be restored to morphology. Therefore, there is no need for the operator to step on the tip of the wire harness (connector, etc.) or drag the tip of the wire harness to damage it, and there is no need to use special temporary fixing means such as tape. Work can be omitted.

According to the grommet having the configuration of (2) above, the tubular wall is axially oriented by separating the curved part (thin part) and the part that generates resistance to restoration from the pushed state (thick part). It is easy to perform the pushing operation while curving the cross section into an S shape, and it is possible to prevent the wire harness from being restored by the weight of the wire harness once the pushed state is obtained. In this case, the lift dimension of the tip of the wire harness can be adjusted by the length of the thick portion located between the two thin portions. In addition, flexibility and rigidity can be freely controlled by adjusting the wall thickness of the tubular wall.

According to the method of temporarily assembling the grommeted wire harness of the above configuration (3) to the vehicle and the temporary assembly structure of the grommeted wire harness of the above configuration (4) to the vehicle, the tubular wall on the small diameter side. Is pushed into the inner peripheral side of the tubular wall on the large diameter portion side, so that the length from the large diameter portion to the small diameter portion can be shortened. Therefore, the position of the wire harness fitted to the small diameter portion can be moved closer to the position close to the large diameter portion. For example, when the tip of the wire harness fitted and fixed to the small diameter portion is hung below the floor panel while the large diameter portion is fitted and fixed to the through hole of the floor panel of the vehicle, the wire that hangs below the floor panel. The harness can be lifted upwards. Further, the grommet holds a state in which the tubular wall on the small diameter portion side is pushed into the inner peripheral side of the tubular wall on the large diameter portion side with its own rigidity. Therefore, the tip of the wire harness can be prevented from lying on the assembly line floor without using a special temporary fixing means such as tape. In addition, when connecting the tip of the wire harness to any of the connection destinations, the tubular wall on the small diameter side can be pulled out from the pushed state by simply pulling the tip of the wire harness strongly, and the grommet can be pulled out to the normal length. It can be restored to morphology. Therefore, there is no need for the operator to step on the tip of the wire harness (connector, etc.) or drag the tip of the wire harness to damage it, and it is not necessary to use special temporary fixing means such as tape. No hassle of work.

According to the present invention, it is possible to prevent the tip of the wire harness from lying on the assembly line floor with a simple operation. Therefore, there is no concern that the operator may step on the tip of the wire harness (connector or the like) with his / her foot or drag the tip of the wire harness to damage it. Also, no special temporary fixing means such as tape is used to prevent the tip of the wire harness from lying on the assembly line floor. Therefore, extra work can be omitted.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments for carrying out the invention described below (hereinafter, referred to as "embodiments") with reference to the accompanying drawings. ..

FIG. 1 is a cross-sectional view showing a structure for temporarily assembling a wire harness with a grommet according to an embodiment of the present invention to a vehicle. FIG. 2 is an external perspective view of the grommet according to the embodiment of the present invention. FIG. 3 is a cross-sectional view for detailed explanation of the grommet according to the embodiment of the present invention. FIG. 4 is a cross-sectional view showing a state in which the grommet is restored to its original form from the state of FIG. FIG. 5 is a cross-sectional view showing a main assembled state in which the connector at the tip of the wire harness with a grommet is connected to the mating connector. FIG. 6 is a schematic cross-sectional view showing a general example of arranging a wire harness to an auxiliary machine under the floor of a vehicle. FIG. 7 is an explanatory diagram of problems when the tip of the wire harness lies on the assembly line floor. FIG. 8 is an explanatory diagram showing an example of conventional measures for preventing the problem of FIG. 7.

Specific embodiments of the present invention will be described below with reference to each figure.

FIG. 1 is a cross-sectional view showing a structure for temporarily assembling a wire harness with a grommet according to an embodiment of the present invention to a vehicle, FIG. 2 is an external perspective view of the grommet, and FIG. 3 is a cross-sectional view for detailed explanation of the grommet. is there.

As shown in FIGS. 1 to 3, the grommet 10 is integrally molded of a flexible material such as rubber. The grommet 10 is inserted into the large diameter portion 11 fitted and fixed to the hole edge of the through hole 112 of the vehicle floor panel (hereinafter, also simply referred to as “panel”) 110 and the through hole 112 of the panel 110. It has a small diameter portion 12 that is fitted and fixed to the outer periphery of the wire harness W, and a conical tubular wall 13 that connects the large diameter portion 11 and the small diameter portion 12. The large diameter portion 11, the tubular wall 13, and the small diameter portion 12 are arranged in this order in the axial direction. That is, the large diameter portion 11 and the small diameter portion 12 are separated from each other.

The large diameter portion 11 is configured as a thick rigid portion in order to secure a fixing force to the vehicle, and an annular groove 11a that fits into the hole edge of the through hole 112 of the panel 110 is formed on the outer periphery. The annular groove 11a is secured between the flange 11b on the end side and the flange 11c on the small diameter portion 12, and the flanges 11b and 11c are provided with a sealing lip 11e at a portion in contact with the panel. There is.

The tubular wall 13 is formed longer than the tubular wall of a normal grommet, and the inner peripheral side of the tubular wall 13 on the large diameter portion 11 side while curving the tubular wall 13 in an S-shaped axial cross section. It has the flexibility to push the tubular wall 13 on the small diameter portion 12 side. At the same time, the tubular wall 13 has a rigidity capable of holding the pushed state.

In order to have both flexibility and rigidity, in the present embodiment, as shown in FIG. 3, the tubular wall 13 is 2 when the tubular wall 13 is curved in an S-shaped axial cross section. It is located between two thin parts 14 and 16 with thin wall thickness and increased flexibility, which are two curved parts, and the wall thickness is thicker than the thin parts 14 and 16. It is provided with a thick portion 15 having increased rigidity. The thick portion 15 is pushed in when the tubular wall 13 on the small diameter portion 12 side is pushed into the inner peripheral side of the tubular wall 13 on the large diameter portion 11 side in a state where the two thin portions 14 and 16 are curved. Generates resistance to restoration from the damaged state. That is, the wall thickness in the range of the dimension La and the range of the dimension Lc in FIG. 3 is reduced, and the wall thickness in the range of the dimension Lb is increased. In this case, the value of the dimension Lb is determined according to the difference in diameter between the large diameter portion 11 and the small diameter portion 12, the wall thickness of the tubular wall 13, and the like. If the dimension Lb is too short, the tubular wall 13 once curved in an S shape will be easily restored to its original shape, so at least the two curved portions (thin portions 14, 16) are in the radial direction. It is necessary to set it longer than the interval Le of.

Next, the structure when the wire harness W with the grommet 10 is temporarily assembled to the vehicle will be described.
As shown in FIG. 1, first, the tip portion of the wire harness W is passed through the grommet 10, and the small diameter portion 12 of the grommet 10 is fitted and fixed to the outer circumference of the wire harness W. Next, the tip of the wire harness W is inserted into the through hole 112 of the panel 110 together with the small diameter portion 12 of the grommet 10, and the large diameter portion 11 of the grommet 10 is fitted and fixed to the hole edge of the through hole 112 of the panel 110. ..

When the large diameter portion 11 of the grommet 10 is fixed to the panel 110 in this way, the tip end side of the wire harness W hangs down on the assembly line floor 130, and if it is left as it is, it will lie down. Therefore, the operator lifts the wire harness W as shown by the arrow A from the hanging state. Then, while the conical tubular wall 13 of the grommet 10 is curved in an axial cross section S-shape, the tubular wall 13 on the small diameter portion 12 side is pushed into the inner peripheral side of the tubular wall 13 on the large diameter portion 11 side. Is done. As a result, the length from the large diameter portion 11 to the small diameter portion 12 is shortened, and the tip side of the wire harness W does not lie on the assembly line floor 130, and is between the lowest position of the wire harness W and the assembly line floor 130. Space H will be secured.

The tubular wall 13 tries to return to its original state by a downward force due to the weight of the wire harness W, but the wall thickness of the grommet 10 and the like are adjusted so as to counter the force. Therefore, the shape of the grommet 10 is maintained by its own rigidity while being pushed in.

FIG. 4 is a cross-sectional view showing a state in which the grommet is restored to the original form from the state of FIG. 1, and FIG. 5 is a cross-sectional view showing the main assembled state in which the connector at the tip of the wire harness with the grommet is connected to the mating connector. Is.

When connecting the tip of the wire harness W to the connector of the auxiliary machine, pull the tip of the wire harness W strongly downward as shown by the arrow B in FIG. Then, the tubular wall 13 on the small diameter portion 12 side can be pulled out from the pushed state, and the grommet 10 can be restored to a normal length and shape. In this state, as shown by the arrow C in FIG. 5, by connecting the connector 106 at the tip of the wire harness W to the connector 108 of the auxiliary machine 107 under the vehicle floor, the main assembly of the wire harness W with the grommet 10 is completed. To do.

According to the above-mentioned temporary assembly structure of the grommet 10 and the wire harness W with the grommet 10 to the vehicle, the tubular wall 13 on the small diameter portion 12 side is pushed into the inner peripheral side of the tubular wall 13 on the large diameter portion 11 side. Therefore, the length from the large diameter portion 11 to the small diameter portion 12 can be shortened. Therefore, the position of the wire harness W fitted to the small diameter portion 12 can be moved closer to the position close to the large diameter portion 11. For example, when the tip of the wire harness W fitted and fixed to the small diameter portion 12 is hung below the floor panel 110 in a state where the large diameter portion 11 is fitted and fixed to the through hole 112 of the floor panel 110 of the vehicle, the floor The wire harness W that hangs below the panel 110 can be lifted. Further, the grommet 10 can hold the pushed state with its own rigidity.

Therefore, the tip of the wire harness W can be maintained in a lifted state only by the grommet 10 without using a special temporary fixing means such as tape, and the tip of the wire harness W is lateral to the assembly line floor 130. You can prevent it from bending. Further, when connecting the tip of the wire harness W to any of the connection destinations, the tubular wall 13 on the small diameter portion 12 side can be pulled out from the pushed state by simply pulling the tip of the wire harness W strongly, and the grommet 10 Can be restored to normal length and morphology. Therefore, there is no need for the operator to step on the tip of the wire harness W (connector, etc.) or drag the tip of the wire harness W to damage it, and it is not necessary to use special temporary fixing means such as tape. Extra work steps can be omitted.

Further, according to the grommet 10 described above, the tubular wall 13 is divided into a curved portion (thin parts 14 and 16) and a portion (thick portion 15) that generates a resistance force against restoration from the pushed state. It is easy to push the grommet while bending it in an S-shaped cross section in the axial direction, and it is possible to prevent the wire harness W from being restored by the weight of the wire harness W once the grommet is pushed in. In this case, the lift dimension of the tip of the wire harness W can be adjusted by the length of the thick portion 15 located between the two thin portions 14 and 16. Further, the flexibility and rigidity can be freely controlled by adjusting the wall thickness of the tubular wall 13.

In the above embodiment, the tubular wall 13 has two thin portions 14 and 16 having a thin wall thickness to increase the flexibility, and a wall thickness made thicker than the thin portions 14 and 16 to increase the rigidity. The case where the thick portion 15 is provided has been described, but the present invention is not limited to this, and the operator can easily bend the tubular wall 13 of the grommet 10 in an S-shaped axial cross section, and the grommet 10 is this. If the thickness that can retain the shape can be set, the tubular wall 13 may have a uniform thickness.

Here, the grommet, the method of temporarily assembling the wire harness with the grommet to the vehicle, and the features of the temporarily assembled structure according to the above-described embodiment of the present invention are briefly summarized and listed below in [1] to [4], respectively. ..
[1] A large diameter portion (11) fitted and fixed to the hole edge of the through hole (112) of the panel (110) and a wire harness (W) inserted into the through hole (112) of the panel (110). It has a small diameter portion (12) that is fitted and fixed to the outer periphery of the surface, and a conical tubular wall (13) that connects the large diameter portion (11) and the small diameter portion (12).
The tubular wall (13) has a small diameter portion on the inner peripheral side of the tubular wall (13) on the large diameter portion (11) side while bending the tubular wall (13) in an S-shaped axial cross section. The tubular wall (13) on the (12) side can be pushed in and has rigidity that can hold the pushed-in state.
A grommet (10) characterized by this.

[2] The tubular wall (13) has two thin portions (14,) having increased flexibility to form two curved portions when the tubular wall (13) is curved in an S-shaped axial cross section. 16) and a thick portion (15) located between the two thin portions (14, 16) and having a thicker wall thickness than the thin portions (14, 16) to increase rigidity. Yes,
The grommet (10) according to the above [1].

[3] A large diameter portion (11) fitted and fixed to the hole edge of the through hole (112) of the panel (110) and a wire harness (W) inserted into the through hole (112) of the panel (110). A wire is attached to a grommet (10) having a small diameter portion (12) fitted and fixed to the outer periphery of the grommet, and a conical tubular wall (13) connecting the large diameter portion (11) and the small diameter portion (12). Through the tip of the harness (W), the small diameter portion (12) of the grommet (10) is fitted and fixed to the outer periphery of the wire harness (W), and the grommet (112) is fitted into the through hole (112) of the panel (110). The tip of the wire harness (W) is inserted together with the small diameter portion (12) of the grommet (10), and the large diameter portion (11) of the grommet (10) is inserted into the hole edge of the through hole (112) of the panel (110). Fitted and fixed, and in that state, the inner circumference of the tubular wall (13) on the large diameter portion (11) side while bending the tubular wall (13) of the grommet (10) in an S-shaped axial cross section. The tubular wall (13) on the small diameter portion (12) side was pushed into the side, and the pushed state was held by the rigidity of the grommet (10) itself.
A method for temporarily assembling a wire harness (W) with a grommet (10) to a vehicle.

[4] A large diameter portion (11) fitted and fixed to the hole edge of the through hole (112) of the panel (110) and a wire harness (W) inserted into the through hole (112) of the panel (110). The grommet (10) having a small diameter portion (12) fitted and fixed to the outer periphery of the grommet (10) and a conical tubular wall (13) connecting the large diameter portion (11) and the small diameter portion (12). The wire harness (W) is inserted through the small diameter portion (12), and the tubular wall (13) on the small diameter portion (12) side is on the inner peripheral side of the tubular wall (13) on the large diameter portion (11) side. The large diameter portion (11) is fitted and fixed to the hole edge of the through hole (112) of the panel (110) in a state where the tubular wall (13) is curved in an S-shaped axial cross section. The curved state was maintained by the rigidity of the grommet (10) itself.
Temporarily assembled structure of wire harness with grommet to the vehicle.

10 Grommet 11 Large diameter part 12 Small diameter part 13 Cylindrical wall 14, 16 Thin part 15 Thick part 110 Panel 112 Through hole W Wire harness

Claims (4)

A large diameter portion that is fitted and fixed to the hole edge of the through hole of the panel, a small diameter portion that is fitted and fixed to the outer periphery of the wire harness that is inserted into the through hole of the panel, and the large diameter portion and the small diameter portion. With a conical tubular wall to connect,
The tubular wall is capable of pushing the tubular wall on the small diameter portion side into the inner peripheral side of the tubular wall on the large diameter portion side while bending the tubular wall in an S-shaped cross section in the axial direction. Has rigidity that can hold the pushed state,
The grommet that is characterized by that. The tubular wall is located between two thin portions having increased flexibility, which becomes two curved portions when the tubular wall is curved in an S-shaped axial cross section, and the two thin portions. , A thick part with a thicker wall thickness than the thin part to increase rigidity.
The grommet according to claim 1, wherein the grommet is characterized in that. A large diameter portion fitted and fixed to the hole edge of the through hole of the panel, a small diameter portion fitted and fixed to the outer periphery of the wire harness inserted through the through hole of the panel, and the large diameter portion and the small diameter portion The tip of the wire harness is passed through the grommet having a conical tubular wall to be connected, and the small diameter portion of the grommet is fitted and fixed to the outer periphery of the wire harness, and the wire together with the small diameter portion of the grommet is fitted to the through hole of the panel. The tip of the harness is inserted to fit and fix the large diameter portion of the grommet to the hole edge of the through hole of the panel, and in that state, the tubular wall of the grommet is curved in an S-shaped axial cross section. However, the tubular wall on the small diameter side was pushed into the inner peripheral side of the tubular wall on the large diameter side, and the pushed state was held by the rigidity of the grommet itself.
A method of temporarily assembling a wire harness with a grommet to a vehicle. A large diameter portion that is fitted and fixed to the hole edge of the through hole of the panel, a small diameter portion that is fitted and fixed to the outer periphery of the wire harness that is inserted into the through hole of the panel, and the large diameter portion and the small diameter portion. The wire harness is inserted through the small diameter portion of the grommet having the conical tubular wall to be connected, and the tubular wall on the small diameter portion side is pushed into the inner peripheral side of the tubular wall on the large diameter portion side. In a state where the tubular wall is curved in an S-shaped axial cross section, the large diameter portion is fitted and fixed to the hole edge of the through hole of the panel, and the curved state is maintained by the rigidity of the grommet itself. ,
Temporarily assembled structure of wire harness with grommet to the vehicle.

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