JP2018196220A - Grommet and wire harness - Google Patents

Abstract

To provide a grommet, etc. which can be properly attached to the utmost in a state of securing water tightness not only in the case that an electric wire through hole is large to a dimension of the grommet but in the case that the electric wire through hole is small to the dimension of the grommet.SOLUTION: A grommet is provided with: a grommet body 10 which is arranged in an electric wire through hole 2 of a vehicle body panel 1, and the inside of which an electric wire W penetrates; a rib 14 which projects on an outer peripheral surface of the grommet body 10, and adheres to an inner peripheral surface of the electric wire through hole 2 due to compressive deformation; and a recess 15 which is provided in the grommet body 10, and is an escape space of the compressive deformation of the rib 14.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a grommet that closes an electric wire through hole of a vehicle body panel through which an electric wire penetrates, and a wire harness having the grommet.

  Conventionally, various grommets have been proposed (for example, Patent Document 1). One conventional example of such a grommet is shown in FIGS. 8 to 11, a wire through hole 2 is formed in a vehicle body panel 1 including a panel body 1a and a cover 1b. An electric wire W is passed through the electric wire through hole 2. A grommet 100 is attached to the outer periphery of the electric wire W.

  The grommet 100 includes a grommet body 101 that is disposed in the wire through hole 2 and is in close contact with the inner peripheral surface of the wire through hole 2, and an inner member 102 that is disposed on the inner periphery of the grommet body 101. On the outer peripheral surface of the grommet body 101, several ribs 101a are projected. Inside the inner member 102, a space through which the electric wire W passes is filled with a filler 103. Filler 103 is in close contact with the inner peripheral surface of inner member 102 and the outer peripheral surface of electric wire W.

  The grommet 100 has an electric wire through hole 2 for routing the electric wire W over the water-receiving area 3 (shown in FIG. 10) on one side of the vehicle body panel 1 and the waterproof area 4 (shown in FIG. 10) on the other side. It is waterproof.

  When the wire through-hole 2 is formed to be nominally or slightly larger (within tolerance), the grommet 100 has the unloaded rib 101a shown in FIG. 11 (a) as shown in FIG. 11 (b). As shown, it is compressed and deformed to form a watertight structure. And since the repulsive force which acts on the cover 1b from the grommet main body 101 is settled in the predetermined range, as shown in FIG. 12, the cover 1b does not float up.

JP 2001-69645 A JP 2001-69646 A

  However, in the conventional grommet 100, when the wire through hole 2 is formed to be smaller than an appropriate dimension, the grommet 100 protrudes from the wire through hole 2 as shown in FIG. An excessive external force is applied to the wire through hole 2 to close it. Then, as shown in FIG. 11 (c), the rib 101a of the grommet main body 101 is excessively compressed and deformed, and the repulsive force acting on the cover 1b from the grommet main body 101 becomes excessive, as shown in FIG. 13 (b). The cover 1b sometimes floated.

  Moreover, when the electric wire through-hole 2 is formed larger than the tolerance with respect to an appropriate dimension, the rib 101a is in a state of being in contact with the inner surface of the electric wire through-hole 2 without being compressed and deformed, and does not have a watertight structure.

  Therefore, the present invention has been made to solve the above-described problems, and can be appropriately attached in a state where water tightness is secured not only when the wire through-hole is large but also when the wire through-hole is small with respect to the size of the grommet. An object is to provide a grommet and a wire harness having the grommet.

  The present invention includes a grommet body that is disposed in an electric wire through hole of a vehicle body panel, and that protrudes from an outer peripheral surface of the grommet main body through which an electric wire penetrates, and a rib that closely contacts the inner peripheral surface of the electric wire through hole by compression deformation And a recessed portion provided in the grommet body and serving as a space for relief deformation due to compression deformation of the rib.

  According to the present invention, when the rib is compressed and deformed, the rib can escape and be deformed, and the range of the compression amount of the rib that can achieve the watertight structure is expanded. Therefore, the grommet can be properly attached to the wire through-hole as much as possible while ensuring the watertightness not only when the wire through-hole is small but also with respect to the size of the grommet.

FIG. 3 is an exploded perspective view of the grommet in an installed state according to the embodiment of the present invention. FIG. 3 is a perspective view showing a grommet installed state according to the embodiment of the present invention. It is the perspective view which showed one Embodiment of this invention and looked at the upper surface side of the grommet. It is the perspective view which showed one Embodiment of this invention and looked at the lower surface side of the grommet. 1 shows an embodiment of the present invention and is a sectional view of a grommet. 1 shows an embodiment of the present invention, (a) is a cross-sectional view of the main part of a rib portion of the grommet body, (b) is a cross section showing a deformed state of the rib part when the electric wire through hole of the vehicle body panel is nominal or slightly larger FIG. 4C is a cross-sectional view showing a deformed state of the rib portion when the wire through hole of the vehicle body panel is small. The modification of one Embodiment of this invention is shown, (a) is principal part sectional drawing of the rib location of a grommet main body, (b) is a deformation | transformation state of a rib part in case the electric wire through-hole of a vehicle body panel is nominal or slightly large (C) is sectional drawing which shows the deformation | transformation state of a rib part in case the electric wire through-hole of a vehicle body panel is small. It is a disassembled perspective view of the installation state of a grommet which shows a conventional example. It is a perspective view of a grommet installed state showing a conventional example. It is sectional drawing of a grommet which shows a prior art example. A conventional example is shown, (a) is a cross-sectional view of the main part of a rib portion of the grommet body, (b) is a cross-sectional view showing a deformed state of the rib part when the wire through hole of the vehicle body panel is nominal or slightly larger, (c ) Is a cross-sectional view showing a deformed state of the rib portion when the wire through hole of the vehicle body panel is small. It is the schematic which shows a prior art example and shows the installation state of a grommet in case the electric wire penetration hole of a vehicle body panel is nominal or large. A conventional example is shown, (a) is a schematic diagram showing a state where a grommet is installed when the wire insertion hole of the vehicle body panel is small, and (b) is forcibly pushed the grommet when the wire insertion hole of the vehicle body panel is small. It is the schematic which shows the state which was already made.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 6 show a first embodiment of the present invention. 1 and 2, a trapezoidal electric wire through hole 2 is formed in the vehicle body panel 1. The electric wire through hole 2 is formed by the cover 1b closing the upper surface opening side of the groove of the panel body 1a. An electric wire (electric wire assembly) W of the wire harness is passed through the trapezoidal electric wire through hole 2. The electric wire W of the wire harness passes through the electric wire through-hole 2 and is distributed over the water-receiving area 3 (shown in FIG. 5) on one side of the vehicle body panel 1 and the waterproof area 4 (shown in FIG. 5) on the other side. It is planned. The flooded region 3 is, for example, outside the vehicle compartment (such as an engine room), and the waterproof region 4 is, for example, a vehicle interior.

  The wire harness has a grommet 5 attached to the outer periphery of the electric wire W. The grommet 5 closes the wire through hole 2 of the vehicle body panel 1. Hereinafter, the configuration of the grommet 5 will be described in detail.

  The grommet 5 includes a grommet main body 10 that is in close contact with the inner peripheral surface of the wire through hole 2 of the vehicle body panel 1 and an inner member 20 that is disposed on the inner periphery of the grommet main body 10.

  The grommet body 10 is formed of an elastic material (for example, a rubber material). The grommet body 10 includes an exterior frame 11 disposed in the electric wire through-hole 2, a cylindrical portion 12 disposed inside the exterior frame 11, and a shielding wall that shields the exterior frame 11 and the cylindrical portion 12 by connecting them. 13. The exterior frame 11 has an outer contour with substantially the same dimensions as the wire through hole 2. Flange portions 11 a are provided on both end sides of the exterior frame 11. The flange portions 11a on both ends are sandwiched between the panel body 1a and the cover 1b. Thereby, the grommet 5 is fixed in the electric wire through hole 2.

  Three ribs 14 (shown in FIGS. 4 and 5) are provided on the outer peripheral surface of the exterior frame 11. The three ribs 14 are arranged at equal intervals in the penetration direction of the wire through hole 2. On the outer surface of the exterior frame 11, each compression-deformed rib 14 is in close contact with the inner peripheral surface of the wire through-hole 2. Thereby, intrusion of water or the like from between the outer peripheral surface of the exterior frame 11 and the inner peripheral surface of the electric wire through hole 2 is prevented.

  The exterior frame 11 is provided with recesses 15 (shown in FIGS. 5 and 6) that serve as escape spaces for compressive deformation of the ribs 14. Each recess 15 is provided on the inner surface side of the exterior frame 11 from which each rib 14 protrudes. Each recess 15 is provided over the entire range in the extending direction of each rib 14.

  Two clip holes 16 are formed on the upper surface side of the exterior frame 11.

  The cylindrical portion 12 is provided with ribs 12a (shown in FIG. 5) at equally spaced positions in the axial direction of the inner peripheral surface thereof. Each rib 12 a is arranged over the entire circumference along the circumferential direction of the cylindrical portion 12. On the inner peripheral surface of the cylindrical portion 12, each compression-deformed rib 12 a is in close contact with the outer peripheral surface of the electric wire W. Thereby, intrusion of water or the like from between the inner peripheral surface of the cylindrical portion 12 and the outer peripheral surface of the electric wire W is prevented.

  One end of the cylindrical portion 12 is supported by the shielding wall 13. The other end (the other end) of the cylindrical portion 12 protrudes from the exterior frame 11 toward the wet region 3. The cylinder part 12 is supported by cantilever.

  The shielding wall 13 connects the ends of the exterior frame 11 and the cylindrical portion 12 on the waterproof region 4 side. The shielding wall 13 shields water and the like from communicating between the exterior frame 11 and the cylindrical portion 12.

  The inner member 20 is formed of a member (for example, a resin material) having higher rigidity than the grommet body 10. The inner member 20 is formed to be slightly smaller than the outer frame 11. The inner member 20 is in close contact over substantially the entire inner peripheral surface of the exterior frame 11. The inner member 20 maintains the form of the grommet body 10 by restricting deformation of the grommet body 10 toward the inner peripheral surface of the exterior frame 11.

  The inner member 20 is provided with two clip portions 20a. Each clip portion 20 a is fitted in the clip hole 16 of the grommet body 10. The inner member 20 is firmly fixed to the grommet body 10 by this fitting.

  In the above configuration, when the wire through hole 2 is nominally or slightly larger (within tolerance) than the appropriate dimension, the unloaded rib 14 shown in FIG. As shown, it is compressed and deformed to form a watertight structure. And since the repulsive force which acts on the cover 1b from the grommet main body 10 is settled in the predetermined range, the cover 1b is not lifted.

  When the wire through-hole 2 is formed smaller than the appropriate dimension, as shown in FIG. 13A, the grommet 5 protrudes from the wire through-hole 2, so that a strong external force is applied to the cover 1b and the wire through-hole. 2 will be closed. Then, the rib 14 of the grommet main body 10 is compressed and deformed. However, since there is a recess 15 on the inner surface side of the outer frame 11 of the grommet main body 10 from which the rib 14 protrudes, the rib 14 is formed as shown in FIG. While bulging into the recess 15 (running away), it is compressed and deformed to form a watertight structure. And since the rib 14 compresses and deforms while bulging into the recess 15 (escapes), even if the amount of compression increases, the repulsive force (compression load) is suppressed, and the cover 1b does not rise.

  Since the range of the compression amount of the rib 14 that can achieve the watertight structure is expanded in this way, if the dimension of the grommet 5 is set large in advance, the wire through hole 2 is formed larger than the tolerance with respect to the appropriate dimension. In addition, the ribs 14 are compressed and deformed to form a watertight structure.

  As described above, the grommet 5 is disposed in the wire through hole 2 of the vehicle body panel 1, and the grommet main body 10 through which the electric wire W penetrates the inside and the outer peripheral surface of the grommet main body 10 are protruded. A rib 14 that is in close contact with the inner peripheral surface by compression deformation and a recess 15 that is provided in the grommet main body 10 and serves as a relief space for compression deformation of the rib 14 are provided.

  Therefore, when the rib 14 is compressed and deformed, the rib 14 can be deformed to escape, and the range of the compression amount of the rib 14 that can achieve a watertight structure is widened. Even in this case, the grommet 5 can be attached to the wire through-hole 2 as much as possible while ensuring water tightness.

  The recessed part 15 is provided in the inner surface side of the grommet main body 10 from which the rib 14 protrudes. Therefore, when the rib 14 is compressed and deformed, it easily escapes into the recess 15 and deforms. Therefore, the repulsive force (compression load) against the increase in the compression amount can be effectively suppressed.

  Next, the dimension of the rib 14 and the dimension of the recessed part 15 are demonstrated. The rib 14 changes its height due to variations due to the tolerance of the vehicle body panel 1 (tolerance of the electric wire through hole 2). That is, when the variation is large, the height of the rib 14 is increased. The recess 15 sets a depth (capacity) within a range in which the rib 14 can escape into the recess 15 and deform. Thereby, the watertight structure by the rib 14 can be formed reliably, and even if the compression amount of the rib 14 reaches the maximum value, the repulsive force (compression load) can be surely suppressed, and the cover 1b can be prevented from being lifted.

  The grommet 5 is provided on the inner peripheral surface side of the grommet main body 10 and includes an inner member 20 that restricts deformation of the grommet main body 10 toward the inner peripheral surface side. Accordingly, the grommet 5 can be passed through the wire in a state where the water tightness is ensured even when the wire through hole 2 is small and large with respect to the dimensions of the grommet 5 while preventing deterioration of the waterproof property due to deformation of the grommet 5. It can be attached to the hole 2 as much as possible.

(Modification)
Next, a modification of the embodiment will be described. In this modification of the grommet, as shown in FIG. 7, only the configuration of the ribs 14 and the recesses 15 provided on the exterior frame 11 of the grommet body 10 is different. That is, as shown in FIG. 7A, several ribs 14 in an unloaded state protrude from the outer surface of the exterior frame 11 and are formed in a substantially trapezoidal shape. The recess 15 is provided continuously next to the rib 14 on the outer surface side of the exterior frame 11 from which the rib 14 projects.

  Since other configurations are the same as those in the above-described embodiment, a duplicate description is omitted.

  In the above configuration, when the wire through-hole is formed to be nominally or slightly larger (within tolerance) than the appropriate dimension, the unloaded rib 14 shown in FIG. 7A is shown in FIG. 7B. Thus, it compresses and deforms while bulging (escapes) into the concave portion 15 to form a watertight structure. And since the repulsive force which acts on the cover 1b from the grommet main body 10 is settled in the predetermined range, the cover 1b is not lifted.

  When the wire through hole 2 is formed to be smaller than the appropriate dimension, the unloaded rib 14 shown in FIG. 7 (a) bulges into the recess 15 (escapes) as shown in FIG. 7 (c). While compressing, it becomes a watertight structure. Since the ribs 14 are compressed and deformed while bulging into the recesses 15 (escape), the repulsive force (compression load) is suppressed even if the amount of compression increases, and the cover 1b does not rise.

  Since the range of the compression amount of the rib 14 that can achieve the watertight structure is expanded in this way, if the dimension of the grommet 5 is set large in advance, the wire through hole 2 is formed larger than the tolerance with respect to the appropriate dimension. In addition, the ribs 14 are compressed and deformed to form a watertight structure.

  Even in this modified example, when the rib 14 is compressed and deformed, the rib 14 can be deformed to be deformed, and the range of the compression amount of the rib 14 that can achieve the watertight structure is widened. Even if it is small, the grommet 5 can be appropriately attached to the wire through-hole 2 as much as possible while ensuring water tightness.

  The recess 15 is provided continuously next to the rib 14 on the outer surface side of the grommet body 10 from which the rib 14 projects. Therefore, the present invention can be applied to a grommet structure in which a filler is filled in the grommet body 10.

  As another modification, the recess 15 is provided at the inner surface side of the grommet main body 10 from which the rib 14 protrudes and at the continuous position adjacent to the rib 14 on the outer surface side of the grommet main body 10 from which the rib 14 protrudes. There is.

  In the embodiment and the modification, three ribs 14 are provided, but may be one, two, or four or more. Two or more ribs 14 are preferable.

DESCRIPTION OF SYMBOLS 1 Body panel 2 Electric wire through-hole 5 Grommet 10 Grommet main body 14 Rib 15 Recess 20 Inner member W Electric wire

Claims (6)

A grommet body that is disposed in the wire through hole of the vehicle body panel and through which the wire penetrates;
A rib that protrudes from the outer peripheral surface of the grommet body and adheres to the inner peripheral surface of the wire through-hole by compression deformation;
A grommet provided on the grommet main body and provided with a recess which is a relief space for compressive deformation of the rib. The grommet according to claim 1,
The grommet, wherein the recess is provided on an inner surface side of the grommet body from which the rib protrudes. The grommet according to claim 1,
The grommet characterized in that the recess is provided continuously to the rib on the outer surface side of the grommet body from which the rib protrudes. The grommet according to claim 1,
The grommet, wherein the recess is provided at an inner surface side of the grommet body from which the rib protrudes and an outer surface side of the grommet body from which the rib protrudes, at a position continuous with the rib. The grommet according to any one of claims 1 to 4, wherein
A grommet comprising an inner member that is disposed on an inner peripheral surface side of the grommet body and restricts deformation of the grommet main body toward the inner peripheral surface side.   A wire harness comprising the grommet according to any one of claims 1 to 5.

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