JP7534864B2 - Grommets and Wire Harnesses - Google Patents

Description

The present invention relates to a grommet and a wire harness.

Conventionally, when a wire harness mounted on a vehicle is routed through a through hole provided in a vehicle body panel, a grommet made of an insulating soft material (e.g., synthetic rubber, elastomer, etc.) is placed between the wire harness and the vehicle body panel to provide waterproofing, dustproofing, soundproofing, etc. Such grommets have a grommet body made of an elastic material and a cylindrical member with a through hole through which the wire harness is inserted in close contact, and a grommet that is fitted into a small diameter cylindrical portion of the grommet body to tightly contact the outer peripheral surface of the cylindrical member with the inner peripheral surface of the small diameter cylindrical portion has been proposed (see, for example, Patent Document 1).

In addition, a water-stopping structure between electric wires that prevents the intrusion of moisture has been proposed that is composed of a grommet, an electric wire bundle, and two water-stopping layers made of elastomer, in which the first water-stopping layer is in a filled and cured state so as to cover the outer periphery of the electric wire bundle, and the second water-stopping layer is in an uncured state so as to fill the spaces between the electric wires of the electric wire bundle (see, for example, Patent Document 2).

JP 2010-74924 A JP 2009-38882 A

In conventional wire harnesses, waterproof tape is wrapped around the wiring material and placed between the grommet and the wiring material to improve watertightness, but the tape wrapping work must be done when assembling the wire harness, and there is room for improvement in this regard.

The present invention was made in consideration of the above problems, and aims to provide a grommet and wire harness that can reduce costs by eliminating the need to wrap waterproof tape while maintaining watertightness between the grommet and the wiring material.

In order to achieve the above object, a grommet according to the present invention comprises a tubular portion formed as an elastic body, which is inserted into a through hole formed in an object to be fixed and through which a wiring material is inserted inside, an annular portion formed to protrude radially outward from an outer circumferential surface of the tubular portion over the entire circumference in the circumferential direction and which fits into the through hole in an inserted state in which the tubular portion is inserted into the through hole, and a tubular member formed as an elastic body and interposed between the tubular portion and the wiring material in an inserted state in which the wiring material is inserted inside the tubular portion, the tubular member having a tubular main body portion housed inside the tubular portion and through which the wiring material is inserted inside, and at least one member-side annular rib formed to protrude radially outward from an outer circumferential surface of at least one end in a tubular axis direction of the tubular main body portion over the entire circumference in the circumferential direction, the tubular main body portion being configured such that the tubular member is inserted into one of the openings in the tubular axis direction of the tubular portion. the tubular member is located inside the tubular portion relative to the mouth portion, and in an interposed state in which the tubular member is interposed between the tubular portion and the wiring material, the inner peripheral surface is in close contact with the outer peripheral surface of the wiring material and elastically deforms radially outward, the tubular portion has a small diameter portion provided on one of the opening sides in the tubular axis direction, and a large diameter portion connected to the small diameter portion in the tubular axis direction via a connecting portion and having an outer diameter and an inner diameter larger than the small diameter portion, the tubular main body portion has a small diameter side tubular main body portion formed on one side in the tubular axis direction and radially facing the inner peripheral surface of the small diameter portion in the interposed state, and a large diameter side tubular main body portion formed on the other side in the tubular axis direction, having an outer diameter relatively larger than the small diameter side tubular main body portion and radially facing the inner peripheral surface of the large diameter portion in the interposed state, and the member side annular rib has a top surface in close contact with the inner peripheral surface of the tubular portion and elastically deforms radially inward in the interposed state.

In the grommet, the cylindrical portion has at least one cylindrical portion-side annular rib formed by protruding radially inward from the inner peripheral surface of one end in the cylindrical axis direction over the entire circumference, and the cylindrical member, in the interposed state, has an outer peripheral surface that is in close contact with the top surface of the cylindrical portion-side annular rib and elastically deforms radially inward.

In the grommet, the component-side annular rib is formed at each of the opening end portions at both ends in the cylindrical axis direction of the cylindrical main body, and the pair of component-side annular ribs are
In the interposed state and the inserted state, the member is arranged to sandwich the tubular portion side annular rib in the tubular axis direction, and each member side annular rib abuts on either side of the tubular portion side annular rib in the tubular axis direction.

In order to achieve the above object, a wire harness according to the present invention comprises a conductive wiring material and a grommet for protecting the wiring material, the grommet being formed as an elastic body and inserted into a through hole formed in a fixed object, the wiring material being inserted inside the grommet, a cylindrical portion formed as an elastic body and inserted into a through hole formed in a fixed object, the wiring material being inserted inside the through hole, an annular portion formed to protrude radially outward from an outer circumferential surface of the cylindrical portion over the entire circumference in the circumferential direction and fitted into the through hole in an inserted state in which the cylindrical portion is inserted into the through hole, and a cylindrical member formed as an elastic body and interposed between the cylindrical portion and the wiring material in an inserted state in which the wiring material is inserted inside the cylindrical portion, the cylindrical member having: a cylindrical main body portion housed inside the cylindrical portion and the wiring material being inserted inside the cylindrical main body portion; and at least one member-side annular rib formed to protrude radially outward from an outer circumferential surface of at least one end in a cylindrical axis direction of the cylindrical main body portion over the entire circumference in the circumferential direction, When the tubular member is located inside the tubular member from one opening in the tubular member's axial direction and is interposed between the tubular member and the wiring material, the inner peripheral surface of the tubular member is in close contact with the outer peripheral surface of the wiring material and elastically deforms radially outward, the tubular member has a small diameter portion provided on one of the openings in the tubular member's axial direction and a large diameter portion connected to the small diameter portion via a connecting portion in the tubular member's axial direction and having an outer diameter and an inner diameter larger than those of the small diameter portion, the small diameter side cylindrical main body portion is formed on one side in the axial direction of the cylinder and radially faces the inner circumferential surface of the small diameter portion in the interposed state, and the large diameter side cylindrical main body portion is formed on the other side in the axial direction of the cylinder and has an outer diameter relatively larger than that of the small diameter side cylindrical main body portion and radially faces the inner circumferential surface of the large diameter portion in the interposed state, and the member side annular rib has a top surface that is in close contact with the inner circumferential surface of the cylindrical portion and elastically deforms radially inward in the interposed state.

The grommet and wire harness of the present invention have the advantage of being able to maintain watertightness between the grommet and the wiring material while eliminating the need to wrap waterproof tape, thereby reducing costs.

FIG. 1 is a perspective view showing a schematic configuration of a wire harness to which a grommet according to an embodiment is applied. FIG. 2 is a cross-sectional view showing a schematic configuration of a wire harness to which the grommet according to the embodiment is applied. FIG. 3 is a partial cross-sectional view showing a schematic configuration of a wire harness to which the grommet according to the embodiment is applied. FIG. 4 is a partial cross-sectional view showing a schematic configuration of a grommet according to an embodiment. FIG. 5 is a perspective view showing a schematic configuration of a cylindrical member that constitutes the grommet according to the embodiment.

Below, embodiments of the grommet and wire harness according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments shown below. Furthermore, the components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

[Embodiment]
FIG. 1 is a perspective view showing the schematic configuration of a wire harness to which a grommet according to an embodiment is applied. FIG. 2 is a cross-sectional view showing the schematic configuration of a wire harness to which a grommet according to an embodiment is applied. FIG. 3 is a partial cross-sectional view showing the schematic configuration of a wire harness to which a grommet according to an embodiment is applied. FIG. 4 is a partial cross-sectional view showing the schematic configuration of a grommet according to an embodiment. FIG. 5 is a perspective view showing the schematic configuration of a tubular member constituting a grommet according to an embodiment. FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1. Also, in FIGS. 1 to 3, a wiring material W and a mounting panel 100, which will be described later, are indicated by two-dot chain lines.

The illustrated X, Y, and Z directions are directions that intersect with each other. The X direction is the cylindrical axis direction of the grommet in this embodiment. The Y direction is the width direction of the grommet in this embodiment, and is a direction perpendicular to the cylindrical axis direction. The Z direction is the up-down direction of the grommet in this embodiment, and is a direction perpendicular to the cylindrical axis direction and width direction.

The grommet 1 of this embodiment shown in Figures 1 and 2 is incorporated into a wire harness WH that is wired in a vehicle (not shown) or the like. Here, the wire harness WH is, for example, a bundle of wiring materials W used for power supply and signal communication to connect various devices mounted on a vehicle, and the wiring materials W are connected to the various devices using connectors (not shown) or the like. The wire harness WH includes a wiring material W having conductivity and a grommet 1 that is provided on the wiring material W and through which the wiring material W is inserted. The wire harness WH may further include various components such as exterior members such as a corrugated tube, a resin tape, and a protector (not shown), an electrical connection box, and a fixing device.

The wiring material W is, for example, composed of a bundle of electric wires. The electric wire has a conductor portion (core wire) made of multiple conductive metal wires, the outside of which is covered with an insulating coating portion.

The grommet 1 is applied to the through hole 101 formed in the mounting panel 100 when wiring the wiring material W across two spaces divided by the mounting panel 100. The mounting panel 100 is an example of a fixed object, and is a metal plate constituting a vehicle body or the like. The through hole 101 is a hole portion that penetrates the mounting panel 100 in the plate thickness direction. The two spaces divided by the mounting panel 100 are an interior space (e.g., a cabin) and an exterior space (e.g., an engine compartment). The grommet 1 is assembled to the through hole 101 in a state in which the wiring material W of the wire harness WH is inserted and sheathed around the wiring material W, thereby protecting the wiring material W passing through the through hole 101 and waterproofing the through hole 101. In addition to waterproofing the through hole 101, the grommet 1 also has functions such as dustproofing and soundproofing.

1 and 2, the grommet 1 is a sealing member through which the wiring material W is inserted along the axial direction of the tube, and capable of waterproofing the space between the grommet 1 and the through hole 101 of the mounting panel 100. The grommet 1 comprises grommet tubular portions 10, 11, a grommet annular portion 20, and a tubular member 30. The grommet tubular portions 10, 11 and the grommet annular portion 20 are formed integrally. For convenience, the grommet tubular portions 10, 11 and the grommet annular portion 20 are referred to as the grommet main body portion 2. The tubular member 30 is formed separately from the grommet main body portion 2, and is assembled to the wiring material W together with the grommet main body portion 2. The grommet body 2 is formed as an elastic body, for example, from an insulating elastic resin material such as rubber or a thermoplastic elastomer that has low rigidity and high flexibility (e.g., ethylene propylene diene rubber (EPDM)).

The grommet tubular parts 10 and 11 are parts of the grommet body 2 that are inserted into the through hole 101 formed in the mounting panel 100, and the wiring material W is inserted inside along the tubular axis direction. The grommet tubular parts 10 and 11 have a coaxial central axis C, are formed in a cylindrical shape centered on the central axis C, and are connected in the tubular axis direction. The grommet tubular part 10 is formed so as to protrude on one side of the grommet body 2 in the tubular axis direction. The grommet tubular part 11 is formed so as to protrude on the other side of the grommet body 2 in the tubular axis direction. The outer diameter of the grommet tubular part 10 in a direction perpendicular to the tubular axis direction is smaller than the outer diameter of the grommet tubular part 11. The grommet tubular part 10 has a grommet opening 13 at one end in the tubular axis direction, and the other end is connected to the grommet tubular part 11. The grommet tubular portion 10 is formed by connecting a small diameter portion 14, a connecting portion 16, and a large diameter portion 15 in this order from the grommet opening 13 side toward the grommet tubular portion 11 side. The grommet tubular portion 10 has multiple tubular portion side annular ribs 10a formed on the inner peripheral surface (Figures 3 and 4).

The small diameter portion 14, the connecting portion 16, and the large diameter portion 15 have the same central axis C. The small diameter portion 14 is connected to the large diameter portion 15 via the connecting portion 16. The large diameter portion 15 has an outer diameter and an inner diameter larger than those of the small diameter portion 14. Here, the inner diameters of the small diameter portion 14, the connecting portion 16, and the large diameter portion 15 refer to the inner diameters of the portions excluding the cylindrical portion side annular rib 10a formed on the inner peripheral surface. The connecting portion 16 is formed so that the outer diameter expands from the small diameter portion 14 side toward the large diameter portion 15 side.

As shown in Figs. 3 and 4, the cylindrical portion side annular rib 10a is a portion formed by protruding from the inner peripheral surface of one end of the grommet body 2 in the cylindrical axis direction toward the inside in the radial direction over the entire circumference in the circumferential direction. More specifically, the cylindrical portion side annular rib 10a is a portion formed by protruding from the inner peripheral surface of the grommet cylindrical portion 10 in the cylindrical axis direction toward the inside in the radial direction over the entire circumference in the circumferential direction. The cylindrical portion side annular rib 10a is formed at intervals in the cylindrical axis direction on the inner peripheral surface of the grommet cylindrical portion 10. More specifically, the cylindrical portion side annular rib 10a is formed at intervals from the end of the inner peripheral surface of the small diameter portion 14 opposite the grommet opening 13 in the cylindrical axis direction to the end of the inner peripheral surface of the large diameter portion 15 on the grommet opening 13 side in the cylindrical axis direction. The grommet cylindrical portion 10 in this embodiment has a plurality of cylindrical portion side annular ribs 10a formed by protruding from the inner peripheral surface radially inward over the entire circumference in the circumferential direction.

The multiple cylindrical portion side annular ribs 10a do not all have the same height from the inner peripheral surface toward the radially inward direction; for example, some are formed higher (or lower) than other portions depending on the outer diameter of the cylindrical member 30 in an interposed state in which the cylindrical member 30 is interposed between the grommet cylindrical portion 10 and the wiring material W. When the cylindrical member 30 is interposed between the grommet cylindrical portion 10 and the wiring material W, the top surface of each cylindrical portion side annular rib 10a comes into close contact with the outer peripheral surface of the cylindrical member 30 and elastically deforms radially outward.

As shown in Figs. 1 and 2, the grommet annular portion 20 is a portion that fits into the through hole 101 when the grommet tubular portions 10, 11 are inserted into the through hole 101. The grommet annular portion 20 is formed to protrude radially outward from the outer peripheral surfaces of the grommet tubular portions 10, 11 over the entire circumference. The grommet annular portion 20 has a fitting groove portion 21 and a lip portion 22.

The fitting groove 21 is a groove formed in the grommet annular portion 20. The fitting groove 21 is formed in the grommet annular portion 20 as a circular groove centered on the central axis C. When the grommet annular portion 20 is fitted into the through hole 101, the edge that forms the through hole 101 in the mounting panel 100 fits into the fitting groove 21.

The lip portion 22 is a pleated water-stopping portion formed along the fitting groove portion 21. The lip portion 22 is formed in the fitting groove portion 21 in a circular ring shape centered on the central axis C. The lip portion 22 contacts the surface of the edge of the through hole 101 when the edge is fitted into the fitting groove portion 21, and stops water from entering between the lip portion 22 and the surface. The lip portion 22 is configured to adhere closely to the surface of the edge that forms the through hole 101 by elastic deformation, and to seal the entire periphery of the through hole 101.

The cylindrical member 30 is formed as an elastic body. The cylindrical member 30 is formed of an insulating elastic resin material (e.g., ethylene propylene diene rubber (EPDM)) having low rigidity and high flexibility, such as rubber or a thermoplastic elastomer. The cylindrical member 30 of this embodiment may be formed of the same material as the grommet main body 2, or may be formed of a different material. The cylindrical member 30 may have the same elastic modulus as the grommet main body 2, or may have a different elastic modulus. The cylindrical member 30 is interposed between the grommet cylindrical parts 10, 11 and the wiring material W in an inserted state in which the wiring material W is inserted inside the grommet cylindrical parts 10, 11 (FIGS. 3 and 4). As shown in FIG. 5, the cylindrical member 30 has cylindrical main bodies 40, 41 and a member-side annular rib 50.

The cylindrical main body 40, 41 is a part of the cylindrical member 30 that is accommodated inside the grommet cylindrical portion 10 and through which the wiring material W is inserted. The cylindrical main body 40, 41 have a coaxial central axis C, are formed in a cylindrical shape centered on the central axis C, and are connected in the cylindrical axis direction. The cylindrical main body 40 has an outer diameter smaller than the cylindrical main body 41. In other words, the cylindrical main body 41 has an outer diameter larger than that of the cylindrical main body 40. The cylindrical main body 40 has a pair of member-side annular ribs 50 at one end in the cylindrical axis direction, and the other end is connected to the cylindrical main body 41 along the cylindrical axis direction. The cylindrical main body 41 has a pair of member-side annular ribs 50 at the other end in the cylindrical axis direction, and the one end is connected to the cylindrical main body 40 along the cylindrical axis direction. The cylindrical main body 40, 41 is formed with an inner diameter that is approximately the same as the outer diameter of the wiring material W. The cylindrical main bodies 40, 41 are formed such that the length of the cylindrical main body 40 connected in the axial direction is shorter than the length of the grommet cylindrical portion 10 in the axial direction. When the cylindrical member 30 is interposed between the grommet cylindrical portion 10 and the wiring material W, the cylindrical main bodies 40, 41 elastically deform radially outward with the inner peripheral surface 40b in close contact with the outer peripheral surface of the wiring material W. When in the interposed state, the cylindrical main bodies 40, 41 have their outer peripheral surfaces in close contact with the multiple cylindrical portion side annular ribs 10a of the grommet cylindrical portion 10.

Here, the wiring material W of this embodiment has a water-stopping portion WT in which a water-stopping agent is filled in a portion radially facing the inner peripheral surface 40b of the tubular member 30 when the tubular member 30 is interposed between the grommet tubular portion 10 and the wiring material W. The water-stopping agent is used to stop water from entering between the wires of the wiring material W inserted into the inside of the tubular main body portions 40, 41 that constitute the tubular member 30. The water-stopping agent is filled into the water-stopping portion WT in the wiring material W and is made of various resin materials that can stop water from entering between the wires of the wiring material W. The water-stopping agent is made of, for example, silicone resin. The water-stopping portion WT is filled with the water-stopping agent, penetrates into the wires of the wiring material W, and hardens to stop water from entering between the wires of the wiring material W through the gap, thereby suppressing the intrusion of liquid from one space side to the other space side of the two spaces partitioned by the mounting panel 100 as a boundary.

The member-side annular rib 50 is a portion formed by protruding from the outer peripheral surface 40a of the tubular member 30 radially outward over the entire circumference. The member-side annular ribs 50 are formed at intervals in the axial direction of the outer peripheral surface 40a of the tubular main body 40, 41. Of the multiple member-side annular ribs 50, a pair of member-side annular ribs 50 are formed at both ends in the axial direction of the outer peripheral surface 40a of the tubular main body 40, 41. In other words, of the multiple member-side annular ribs 50, a pair of member-side annular ribs 50 are formed at the opening side end of the tubular main body 40 in the axial direction and the opening side end of the tubular main body 41 in the axial direction. Of the multiple member-side annular ribs 50, a pair of member-side annular ribs 50 are arranged to sandwich the tubular part-side annular rib 10a in the axial direction when the tubular member 30 is interposed between the grommet tubular part 10 and the wiring material W. Of the multiple member-side annular ribs 50, a pair of member-side annular ribs 50 abut on either side of the cylindrical portion-side annular rib 10a in the cylindrical axis direction when the cylindrical member 30 is interposed between the grommet cylindrical portion 10 and the wiring material W. In this embodiment, the multiple member-side annular ribs 50 are formed to have the same height from the outer circumferential surface 40a toward the radially outward side, for example.

Next, the assembly work of the wire harness WH in this embodiment will be briefly described. First, the worker places the tubular member 30 in the water-stopping portion WT of the wiring material W while passing the wiring material W through the tubular member 30. The water-stopping portion WT of the wiring material W is filled with a water-stopping agent in advance, and has a mark or the like visible from the outside on its surface. Next, the worker passes the wiring material W through the grommet 1 while holding the tubular member 30 so that the tubular member 30 does not move in the extension direction of the wiring material W. At this time, the worker places the grommet 1 in a predetermined position so that the tubular member 30 is interposed between the grommet tubular portion 10 and the wiring material W.

The wire harness WH is provided in the extension direction of the wiring material W, and the tubular member 30 is arranged so that the inner peripheral surface of the tubular member 30 covers the outer peripheral surface of the water-stopping portion WT filled with a water-stopping agent, so that the inner peripheral surface comes into close contact with the outer peripheral surface of the water-stopping portion WT and elastically deforms radially outward. This makes it possible to prevent the water-stopping agent filled in the water-stopping portion WT of the wiring material W from leaking out.

As described above, in the present embodiment, the grommet 1 and the wire harness WH are in an interposed state in which the tubular member 30 is interposed between the tubular portion 10 and the wiring material W, and the inner circumferential surface 40b is in close contact with the outer circumferential surface of the wiring material W and elastically deforms radially outward. As a result, the inner circumferential surface 40b of the tubular member 30 elastically recovers radially inward, increasing the degree of contact between the inner circumferential surface 40b and the outer circumferential surface of the wiring material W, thereby closing the gap between the tubular member 30 and the wiring material W. As a result, the watertightness between the grommet 1 and the wiring material W is maintained, and the work of wrapping waterproof tape around the wiring material W can be eliminated, reducing the number of parts and the number of work steps, thereby reducing costs. In addition, when the cylindrical member 30 is interposed between the cylindrical portion 10 and the wiring material W, the top surface of the member-side annular rib 50 of the grommet 1 and the wire harness WH elastically deforms radially inward, with the top surface in close contact with the inner peripheral surface of the grommet cylindrical portion 10. As a result, the top surface of the member-side annular rib 50 elastically recovers radially outward, increasing the degree of contact between the top surface and the inner peripheral surface of the grommet cylindrical portion 10. As a result, watertightness between the grommet 1 and the wiring material W is maintained, and the work of wrapping waterproof tape around the wiring material W and the grommet 1 can be eliminated, reducing the number of parts and the number of work steps, thereby reducing costs.

In addition, in the grommet 1 and the wire harness WH in this embodiment, the tubular portion 10 has a plurality of tubular portion side annular ribs 10a formed by protruding radially inward from the inner peripheral surface over the entire circumference. When the tubular member 30 is interposed between the tubular portion 10 and the wiring material W, the outer peripheral surface 40a of the tubular portion 30 is in close contact with the top surface of the tubular portion side annular rib 10a and elastically deforms radially inward. As a result, the outer peripheral surface 40a elastically recovers radially outward, and the plurality of tubular portion side annular ribs 10a elastically recover radially inward, increasing the degree of contact between the outer peripheral surface 40a and the top surface of the tubular portion side annular rib 10a. As a result, the watertightness between the grommet 1 and the wiring material W is improved, and the work of wrapping waterproof tape around the wiring material W and the grommet 1 can be eliminated, reducing the number of parts and the number of work steps, thereby reducing costs.

In addition, in the grommet 1 and wire harness WH in this embodiment, a pair of the multiple member-side annular ribs 50 are arranged to sandwich the tubular portion-side annular rib 10a in the tubular axis direction in the interposed state, and each member-side annular rib 50 abuts on one of the tubular portion-side annular ribs 10a in the tubular axis direction. This makes it possible to restrict the tubular member 30 from moving in the tubular axis direction relative to the grommet 1. As a result, for example, even if the wiring material W is pulled during assembly work, it is possible to suppress the positional shift of the tubular member 30 relative to the grommet 1, and suppress the deterioration of the water-stopping property caused by the positional shift.

In the above embodiment, the cylindrical portion side annular rib 10a is formed at intervals in the cylindrical axis direction on the inner peripheral surface of the grommet cylindrical portion 10, but this is not limited to this. For example, only one cylindrical portion side annular rib 10a may be formed on the inner peripheral surface of the grommet cylindrical portion 10 on the grommet opening 13 side in the cylindrical axis direction.

In addition, in the above embodiment, the pair of member-side annular ribs 50 are formed at the opening end in the axial direction of the cylindrical main body 40 and the opening end in the axial direction of the cylindrical main body 41, but this is not limited to this. For example, they may be formed at either the opening end in the axial direction of the cylindrical main body 40 or the opening end in the axial direction of the cylindrical main body 41.

In addition, in the above embodiment, the multiple member-side annular ribs 50 are formed, for example, with the same height from the outer peripheral surface 40a toward the radially outward direction, but this is not limited to this. For example, the multiple member-side annular ribs 50 may be formed so that their respective radial heights differ from each other depending on the radial height of the tubular portion-side annular rib 10a, etc.

In addition, in the above embodiment, the inner diameter of the cylindrical main body 40 is formed to be approximately the same as the outer diameter of the wiring material W, but this is not limited to this. For example, the inner diameter of the cylindrical main body 40 may be formed to be smaller than the outer diameter of the wiring material W.

In the above embodiment, the wiring material W is composed of a bundle of electric wires, but is not limited to this. For example, the wiring material W may be a metal rod or an electric wire. A metal rod is a rod-shaped member having a conductive property, the outside of which is covered with an insulating coating.

REFERENCE SIGNS LIST 1 Grommet 2 Grommet body 10, 11 Grommet cylindrical part 10a Cylindrical part side annular rib 13 Grommet opening 20 Grommet annular part 30 Cylindrical member 40 Cylindrical main body 50 Member side annular rib 100 Mounting panel 101 Through hole W Wiring material WH Wire harness

Claims (4)

A cylindrical portion formed as an elastic body, inserted into a through hole formed in the object to be fixed, and through which a wiring material is inserted;
an annular portion that is formed to protrude radially outward from an outer circumferential surface of the cylindrical portion over the entire circumference in the circumferential direction and that fits into the through hole when the cylindrical portion is inserted into the through hole;
A cylindrical member is formed as an elastic body and is interposed between the cylindrical portion and the wiring material in an inserted state in which the wiring material is inserted inside the cylindrical portion,
The cylindrical member is
A cylindrical main body portion that is accommodated inside the cylindrical portion and through which the wiring material is inserted;
At least one member-side annular rib is formed so as to protrude radially outward from an outer circumferential surface of at least one end of the cylindrical main body in the axial direction, over the entire circumference of the cylindrical main body,
The cylindrical main body portion is
The tubular member is located inside the tubular portion from one opening in the tubular portion in the tubular axis direction, and in an interposed state in which the tubular member is interposed between the tubular portion and the wiring material, the inner circumferential surface is in close contact with the outer circumferential surface of the wiring material and elastically deforms radially outward,
The cylindrical portion is
a small diameter portion provided on one side of the opening in the cylindrical axis direction;
a large diameter portion connected to the small diameter portion in the cylindrical axis direction via a connecting portion and having an outer diameter and an inner diameter larger than those of the small diameter portion,
The cylindrical main body portion is
a small diameter side cylindrical main body portion formed on one side in the cylindrical axis direction and radially facing an inner peripheral surface of the small diameter portion in the interposed state;
a large diameter side cylindrical main body portion formed on the other side in the cylindrical axis direction, having an outer diameter relatively larger than that of the small diameter side cylindrical main body portion, and radially facing an inner circumferential surface of the large diameter portion in the interposed state;
The member-side annular rib is
In the interposed state, the top surface is in close contact with the inner circumferential surface of the cylindrical portion and elastically deforms radially inward.
A grommet characterized by: The cylindrical portion is
at least one cylindrical portion-side annular rib is formed protruding radially inward from an inner peripheral surface of one end in the cylindrical axis direction over the entire circumference in the circumferential direction,
The cylindrical member is
In the interposed state, the outer circumferential surface of the tubular portion is in close contact with the top surface of the tubular portion side annular rib and elastically deforms radially inward.
The grommet of claim 1 . The member-side annular rib is
The cylindrical main body portion has an opening end at each end in the cylindrical axis direction,
The pair of member-side annular ribs are
In the interposed state and the inserted state, the member-side annular rib is disposed so as to sandwich the tubular portion-side annular rib in the tubular axis direction, and each member-side annular rib abuts on either one side of the tubular portion-side annular rib in the tubular axis direction.
The grommet of claim 2. A wiring material having electrical conductivity;
A grommet for protecting the wiring material;
Equipped with
The grommet is
A cylindrical portion formed as an elastic body, inserted into a through hole formed in a fixed object, and through which the wiring material is inserted;
an annular portion that is formed to protrude radially outward from an outer circumferential surface of the cylindrical portion over the entire circumference in the circumferential direction and that fits into the through hole when the cylindrical portion is inserted into the through hole;
A cylindrical member is formed as an elastic body and is interposed between the cylindrical portion and the wiring material in an inserted state in which the wiring material is inserted inside the cylindrical portion,
The cylindrical member is
A cylindrical main body portion that is accommodated inside the cylindrical portion and through which the wiring material is inserted;
At least one member-side annular rib is formed so as to protrude radially outward from an outer circumferential surface of at least one end of the cylindrical main body in the axial direction, over the entire circumference of the cylindrical main body,
The cylindrical main body portion is
The tubular member is located inside the tubular portion from one opening in the tubular portion in the tubular axis direction, and in an interposed state in which the tubular member is interposed between the tubular portion and the wiring material, the inner peripheral surface is in close contact with the outer peripheral surface of the wiring material and elastically deforms radially outward,
The cylindrical portion is
a small diameter portion provided on one side of the opening in the cylindrical axis direction;
a large diameter portion connected to the small diameter portion in the cylindrical axis direction via a connecting portion and having an outer diameter and an inner diameter larger than those of the small diameter portion,
The cylindrical main body portion is
a small diameter side cylindrical main body portion formed on one side in the cylindrical axis direction and radially facing an inner peripheral surface of the small diameter portion in the interposed state;
a large diameter side cylindrical main body portion formed on the other side in the cylindrical axis direction, having an outer diameter relatively larger than that of the small diameter side cylindrical main body portion, and radially facing an inner circumferential surface of the large diameter portion in the interposed state;
The member-side annular rib is
In the interposed state, the top surface is in close contact with the inner circumferential surface of the cylindrical portion and elastically deforms radially inward.
A wire harness comprising:

Images