JP6673429B2 - Grommets and wire harnesses - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet and a wire harness which are attached to a through hole of a vehicle panel or the like and which allow a group of electric wires to pass therethrough in consideration of waterproofness.

  Conventionally, a through hole is provided in a vehicle body panel such as a dash panel that separates an engine room and a vehicle room of an automobile, and it is generally practiced to route a wire harness between the engine room side and the vehicle room side through the through hole. Have been done. In arranging such a wire harness, a grommet is provided between the wire harness and the through-hole of the vehicle body panel to prevent intrusion of water and dust and noise from a gap in the through-hole.

  Many of the through holes in the vehicle body panel are provided with burring. For the body panel provided with the burring, it is necessary to design the shape of the grommet in consideration of the shape of the burring and to secure the waterproofness.

  An example of a grommet to be fitted into a through hole having a burring provided in a vehicle body panel is described in Japanese Patent Application Laid-Open No. H11-163,837. The grommet 10 described in Patent Literature 1 has a tapered portion 2 and a fitting portion 3 as shown in FIG. 7, and the fitting portion 3 has a first groove 4, a second groove 6, an annular protrusion 5, and a flange. And a unit 7. The burring of the panel 11 rises vertically.

  When the panel 11 is fitted to the grommet 10, the rising portion of the burring presses the annular protrusion 5 and seals at three points A, B, and C in FIG.

JP-A-4-249817

  However, the shape of the burring is not limited to that rising vertically to the panel surface as described in Patent Literature 1; FIG. 8 shows an example in which a grommet is fitted to a panel having such a burring inclined with respect to the panel surface. In the example shown in FIG. 8, since the surface where the burring and the grommet come into contact is inclined, there is a problem that sufficient surface pressure cannot be obtained and the water stopping performance is reduced.

  The present invention has been made in order to solve the above-described problems, and has a grommet that can improve water stoppage when a burring of a vehicle body panel is inclined with respect to a panel surface, and a wire harness using the grommet. The purpose is to provide.

The grommet according to the present invention has, in order to achieve the above object, a burring formed on a partition panel that separates the outside and the indoor has a tapered cylindrical shape protruding from the partition panel to the inside of the room. A grommet that is inserted so as to be inserted into the room from the outside in the inserted state so as to stop water; a tapered cylindrical portion whose diameter gradually increases from a distal end side to a proximal end side in an insertion direction; and a base of the tapered cylindrical portion. A fitting portion formed on an end side outer surface portion and fitted to the burring, wherein the fitting portion is formed so as to accommodate a tip surface side portion of the burring when assembled to the burring. And a taper that is formed in contact with the annular groove and is in close contact with a part of the reference tapered cylinder surface on the small diameter side that matches the tapered cylinder inner surface of the burring when assembled to the burring. An outer surface portion, which is formed so as to be continuous with the outer surface portion of the tapered cylinder, and both sides are straight sides with respect to a remaining portion of the reference tapered cylinder surface, a central portion has an arc-shaped cross section, and projects outward, and the burring A first seal portion that is pressed against and tightly adheres to the inner surface of the tapered cylinder of the burring at the time of assembly to the burring, and is formed so as to be connected to the first seal portion, and surrounds the outside of the burring at the time of assembly to the burring An annular flat portion facing the partition panel, and a second annular portion surrounding the annular flat portion, which is formed so as to be connected to the outer peripheral end of the annular flat portion, and protrudes more indoors than the annular flat portion. A second seal portion, and a second annular portion surrounding the outer annular flat portion formed on the outer peripheral end of the outer annular flat portion formed outside the second seal portion, and projecting more indoors than the outer annular flat portion. Sea of 3 It is configured to include a part, a.

  With this configuration, the annular groove accommodates the distal end surface side portion of the burring so as to bite in the distal direction, the outer surface of the tapered cylinder is in close contact with the inner surface of the tapered cylinder of the burring, and the first seal portion is pushed into the burring. It deforms and comes into close contact with the inner surface of the tapered cylinder of the burring. In addition, the second seal portion strongly adheres to the partition panel at a position surrounding the annular flat portion in a state where the first seal portion is pressed into the burring and deformed.

  Therefore, since the fitting portion has the annular groove portion, the outer surface portion of the tapered cylinder, the first seal portion, and the second seal portion, which are in close contact with and fitted to the burring, and the surface pressure can be secured. When it is inclined with respect to, the water stoppage can be improved.

The grommet according to the present invention, wherein the fitting portion includes an annular groove portion formed so as to accommodate a tip surface side portion of the burring when assembled to the burring, and the annular groove portion includes a tip surface of the burring. When accommodating a side part, you may comprise so that the front-end | tip part side part of the said burring may bite in the front-end | tip direction.

  With this configuration, when the distal end surface side portion of the burring is accommodated in the annular groove portion, the distal end surface side portion of the burring bites into the annular groove portion in the distal direction, the adhesion between the burring and the grommet is increased, and the water stopping performance is improved. Can be.

The grommet according to the present invention has a tapered tube portion whose tube diameter gradually increases from the distal end side to the base end side in the insertion direction of the grommet, and the height from the annular flat portion to the lower end of the tapered tube portion is The burring may be configured to be smaller than the vertical height of the burring so that the biting state occurs.

  With this configuration, when the grommet is assembled to the partition panel, the burring cuts into the grommet side and a vertical force acts, so that the adhesion of the grommet can be strengthened and the water stopping performance can be improved.

  The grommet according to the present invention may be configured such that an inner diameter of the burring at an upper end of the inner surface of the tapered cylinder is smaller than a minimum inner diameter of the annular groove so that the biting state occurs.

  With this configuration, when the grommet is assembled to the partition panel, the burring cuts into the grommet side and a horizontal force acts, so that the adhesion of the grommet can be strengthened and the water stopping performance can be improved.

  A wire harness according to the present invention includes a wire group and the grommet, the wire group being inserted through the grommet, and the wire group and the grommet being wound with an adhesive tape at a tip end side of the grommet. This is a configuration that is connected and fixed by a fixing portion.

  With this configuration, in the wire harness according to the present invention, the wire group is inserted through the grommet, and the wire group and the grommet are connected and fixed at the tape fixing portion formed by winding the adhesive tape at the tip end of the grommet, so that the grommet is mounted. Later, when an external force acting laterally from the center of the grommet continuously acts on the group of electric wires inserted through the grommet, the base end side of the grommet is deformed to a side pulled by the external force.

  In this case, on the side opposite to the side where the grommet is deformed, the bite between the annular groove portion and the burring tip surface side becomes shallow, but the close contact is not released, and the first seal portion is hardly inserted. Deformation does not occur, and the state in which the burring is strongly adhered to the inner surface of the tapered cylinder is maintained. For this reason, even if the adhesion between the second seal portion and the exterior surface of the partition panel is weak, and moisture may be transmitted to the annular flat portion from the second seal portion, this moisture passes through the first seal portion. Thus, the water barrier property can be improved without reaching the interior side of the partition panel.

  ADVANTAGE OF THE INVENTION According to this invention, when the burring of a vehicle body panel is inclined with respect to a panel surface, water stoppage can be improved.

FIG. 2 is a longitudinal sectional view illustrating a configuration of a wire harness and a grommet according to the embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing a fitting portion of the grommet according to the embodiment of the present invention before fitting the vehicle body panel. FIG. 4 is a partial cross-sectional view showing details of a fitting portion of the grommet according to the embodiment of the present invention before fitting the vehicle body panel. FIG. 4 is a partial cross-sectional view showing a fitting portion of the grommet according to the embodiment of the present invention after fitting the vehicle body panel. It is a fragmentary sectional view showing the modification of the fitting part after fitting the body panel of the grommet concerning an embodiment of the invention. FIG. 3 is a cross-sectional view showing a vehicle body panel fitted to the grommet according to the embodiment of the present invention. It is a longitudinal section showing an example of the conventional grommet used for a wire harness. FIG. 8 is a longitudinal sectional view showing an example in which a vehicle body panel is fitted to a conventional grommet used for a wire harness.

  Hereinafter, embodiments of a grommet and a wire harness according to the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing the grommet and the wire harness according to the present embodiment. As shown in FIG. 1, the wire harness 1 includes a wire group W and a grommet 10. The wire harness 1 is fitted through a grommet 10 to a vehicle body panel 20 that separates the indoor side and the outdoor side of the vehicle body.

  The electric wire group W is composed of a plurality of electric wires, and is inserted inside the grommet 10 from the indoor side to the outdoor side of the vehicle body. The wire group W and the grommet 10 are connected and fixed by winding an adhesive tape at a tape fixing portion 22 on the tip end side of the grommet 10. The upper side of the vehicle body panel in FIG. 1 is referred to as an indoor side, and the lower side is referred to as an outdoor side. The lower side of the grommet is referred to as a proximal side, and the upper side is referred to as a distal side.

  As shown in FIG. 6, a through hole through which the wire harness 1 is inserted is provided in the vehicle body panel 20, and a burring 21 is formed around the through hole. The burring 21 has a tapered cylindrical shape protruding from the vehicle body panel 20 to the indoor side and inclined toward the center of the through hole.

  The height of the burring 21 in the vertical direction is A, and the burring 21 is formed to be larger than a height A ′ from an annular flat portion 16 to a lower end of the tapered tubular portion 11 described later. The inner diameter of the upper end of the tapered cylinder inner surface 21a of the burring 21 is B, which is formed to be smaller than the minimum inner diameter B 'of the annular groove 13 described later. This is because when the burring 21 is assembled to the burring 21, a state in which the front end surface side portion of the burring 21 bites into the panel fitting portion 12 and the adhesion between the burring 21 and the grommet 10 is improved.

  In the present embodiment, the inclination of the tapered cylindrical shape of the burring 21 is about 60 degrees with respect to the vehicle body panel 20, but is not necessarily limited to this angle and may be another angle such as 45 degrees. The burring 21 is fitted to a panel fitting portion 12 of the grommet 10 described later.

  Next, the vicinity of the panel fitting portion 12 of the grommet 10 will be described with reference to FIGS. FIG. 2 shows a state before the grommet 10 is fitted to the vehicle body panel 20. The grommet 10 includes a tapered tubular portion 11 and a panel fitting portion 12. The grommet 10 is inserted from the outside of the room with the electric wire group W inserted and attached to the burring 21 to stop water so as to prevent intrusion of moisture or the like from outside the vehicle body. The grommet 10 is formed of a flexible material such as rubber.

  The diameter of the tapered tube portion 11 gradually increases from the distal end side to the base end side in the insertion direction of the wire group W. This shape facilitates insertion of the grommet 10 into the vehicle body panel 20.

  The panel fitting portion 12 has an annular groove portion 13, a tapered cylindrical outer surface portion 14, an arc rib 15, an annular flat surface portion 16, an auxiliary seal portion 17, an outer annular flat portion 18, and an outer auxiliary seal portion 19. The panel fitting portion 12 is formed on the outer surface of the base end side of the tapered tubular portion 11, and is fitted to the burring 21 as shown in FIG. The panel fitting portion 12 forms a fitting portion according to the present invention, and the auxiliary seal portion 17 forms a second sealing portion according to the present invention.

  The annular groove portion 13 is an annular groove-shaped space formed so as to receive the distal end surface side portion of the burring 21 so as to bite in the distal end direction of the tapered tubular portion 11 of the grommet 10 when assembled to the burring 21. When the tip surface side portion of the burring 21 is accommodated, the tip surface side portion of the burring 21 is configured to bite in the tip direction. That is, the grommet 10 is configured to be in a state where the burring 21 bites in the distal end direction when mounted on the vehicle body panel 20. Further, the annular groove portion 13 has a minimum inner diameter B ′ at a position where the inner diameter becomes smallest.

  As described above, the grommet 10 comes into close contact with the burring 21 when the burring 21 bites into the tapered tubular portion 11, so that intrusion of water or the like in the closely contacting region is prevented, and the water stopping performance is improved. Here, the biting state refers to a state in which the distal end surface side portion of the burring 21 bites into the distal end direction of the tapered tubular portion 11 of the grommet 10 by about several mm as shown in FIG.

  The tapered cylinder outer surface portion 14 is formed so as to be continuous with the annular groove portion 13 and is in close contact with a part of the small diameter side of the reference tapered cylinder surface L that coincides with the tapered cylinder inner surface portion 21a when assembled to the burring 21.

  Here, the reference tapered cylindrical surface L is, as shown in FIG. 4, a surface formed by a group of straight lines connecting both ends of the arc rib 15, and in the present embodiment, is directed toward the center of the grommet 10 with respect to the body panel 20. The angle is about 60 degrees. The angle of about 60 degrees is adapted to the inclination angle of the burring 21 so that the arc rib 15 and the burring 21 can easily adhere to each other. If the inclination angle of the burring 21 changes, the angle may be changed accordingly. . The smaller diameter side is a side where the diameter of the annular grommet 10 is smaller, that is, an upper side in the figure.

  Since the tapered cylinder outer surface portion 14 is on the reference tapered cylinder surface L, it is inclined by about 60 degrees with respect to the vehicle body panel 20 similarly to the reference tapered cylinder surface L, and has the same inclination angle as the burring 21. The inclination angle may be changed according to the inclination angle.

  The arcuate rib 15 is formed so as to be continuous with the outer surface portion 14 of the tapered cylinder, and both sides are straight sides with respect to the remaining portion L1 of the reference tapered cylinder surface L before being assembled to the burring 21 shown in FIG. The central portion has an arcuate cross-section and projects outward. Here, the remaining portion L1 is a surface of the reference tapered cylindrical surface L shown in FIG. 4 which intersects with the circular arc rib 15 before being assembled to the burring 21.

  When the arc rib 15 is assembled to the burring 21 shown in FIG. 3, the arc rib 15 is pressed and deformed and adheres to the tapered cylinder inner surface 21a of the burring 21 in a direction perpendicular to the reference tapered cylinder surface L. In the area where the burring 21 is in close contact with the burring 21, a force that pushes the arc rib 15 in a direction perpendicular to the reference tapered cylindrical surface L acts. I have. The arcuate rib 15 constitutes a first seal portion according to the present invention.

  The annular flat portion 16 is formed so as to be continuous with the arc rib 15, surrounds the outside of the burring 21 when facing the vehicle body panel 20 when assembling to the burring 21, and faces the vehicle body panel 20 when assembling to the burring 21. Is a ring-shaped flat surface that is in close contact with the surface. The height from the annular plane portion 16 to the lower end of the tapered tube portion 11 is A '.

  In this embodiment, the annular flat portion and the vehicle body panel 20 are configured to be in close contact with each other, but may be configured to have a gap as shown in FIG. This is because the grommet 10, the burring 21, and the vehicle body panel 20 are sufficiently adhered to each other in the annular groove 13, the arcuate rib 15, and the auxiliary seal portion 17, so that a water stopping effect is obtained.

  The auxiliary seal portion 17 is formed so as to be continuous with the outer peripheral end of the annular flat portion 16, and is formed in an annular shape surrounding the annular flat portion 16 and protrudes more toward the indoor side than the annular flat portion 16. When assembling the grommet 10 to the vehicle body panel 20, the auxiliary seal portion 17 is pressed downward by the vehicle body panel 20, deformed, and comes into close contact.

  The outer annular flat portion 18 is formed so as to be connected to the outside of the auxiliary seal portion 17, and forms a horizontal annular flat surface. In the present embodiment, the height of the outer annular flat portion 18 is lower than the height of the annular flat portion 16, and the outer annular flat portion 18 and the vehicle body are assembled with the grommet 10 shown in FIG. It has a predetermined gap without being in close contact with the panel 20. However, the height of the outer annular flat portion 18 may be the same as the height of the annular flat portion 16 so that the outer annular flat portion 18 and the vehicle body panel 20 are in close contact with each other during assembly.

  The outer auxiliary seal portion 19 is formed so as to be connected to the outside of the outer annular flat portion 18. The outer auxiliary seal portion 19 is formed on the outer peripheral end of the outer annular flat portion 18 in an annular shape surrounding the outer annular flat portion 18 and on the indoor side than the outer annular flat portion 18. It is designed to protrude. When assembling the grommet 10 to the vehicle body panel 20, the outer auxiliary seal portion 19 is pressed downward by the vehicle body panel 20, deformed, and comes into close contact.

  In the present embodiment, one outer annular flat portion 18 and one outer auxiliary seal portion 19 are formed outside the auxiliary seal portion 17, but a plurality of sets may be formed.

  Next, the action of the force acting when the grommet 10 is assembled to the vehicle body panel 20 will be described with reference to FIG. Since the height A 'of the grommet 10 from the annular flat portion 16 to the lower end of the tapered tubular portion 11 is smaller than the height A of the burring 21 in the vertical direction, first, in order to attach the grommet 10 to the body panel 20, Presses the auxiliary seal portion 17 and the outer auxiliary seal portion 19 downward in the direction perpendicular to the inclination direction of the burring 21 to deform the arc rib 15.

  The arc rib 15 is deformed to the position of the reference tapered cylindrical surface L, and becomes an arc rib 15 'indicated by a dotted line in the figure. The auxiliary seal portion 17 and the outer auxiliary seal portion 19 are deformed to the height of the annular flat portion 16, and become an auxiliary seal portion 17 'and an outer auxiliary seal portion 19' indicated by a dotted line in the drawing.

  Further, since the inner diameter B at the upper end of the tapered cylinder inner surface 21a of the burring 21 is smaller than the minimum inner diameter B 'of the annular groove 13, the tip end of the burring 21 bites into the annular groove 13 of the grommet 10 to deform the grommet 10 at the time of assembly. It has become.

  After the grommet 10 is assembled to the vehicle body panel 20, the auxiliary seal portion 17, the outer auxiliary seal portion 19, the tapered tubular portion 11, and the annular groove portion 13 of the grommet 10 exert a reaction force on the vehicle body panel 20 in the direction of the arrow in FIG. ing. Since this reaction force has a component in both directions, a horizontal component and a vertical component, the grommet 10 is adapted to exert a force of adhering to the vehicle body panel 20 in both the horizontal direction and the vertical direction.

  Therefore, the grommet 10 can maintain the close contact state with the vehicle body panel 20 against external forces applied from multiple directions, and, for example, when compared to a configuration in which a force that closes only in the horizontal direction is applied, the close contact state is more stable. It is excellent in waterproofness.

  As described above, the grommet 10 according to the present embodiment has a tapered cylindrical shape in which the burring 21 formed on the vehicle body panel 20 that separates the outside and the room projects from the body panel 20 toward the room. A tapered tube portion 11 that is inserted from the outside of the room with the wire group W inserted therein so as to stop water, and has a tube diameter that gradually increases from the distal end side to the base end side in the insertion direction; And a panel fitting portion 12 formed on the base end side outer surface portion and fitted to the burring 21.

  In addition, the fitting portion 12 is formed so as to be accommodated in a state in which the front end surface side portion of the burring 21 bites in the front end direction when assembled to the burring 21, and is formed so as to be connected to the annular groove portion 13. A tapered cylinder outer surface portion 14 which is in close contact with a part of the reference tapered cylinder surface L on the small diameter side which coincides with the tapered cylinder inner surface portion 21a of the burring 21 when assembled to the burring 21; Both sides are straight sides with respect to the remaining portion L1 of the reference tapered cylinder surface L, the central portion has an arc-shaped cross section, protrudes outward, and when assembled to the burring 21, the tapered cylinder inner surface 21a of the burring 21 is assembled. An arc rib 15 that is pressed against and closely contacts the arc rib 15, and is formed so as to be connected to the arc rib 15, surrounds the outside of the burring 21, and faces the vehicle body panel 20 when assembled to the burring 21. An annular flat portion 16 and an auxiliary seal portion 17 which is formed so as to be connected to the outer peripheral end of the annular flat portion 16 and is annular and surrounds the annular flat portion 16 and protrudes toward the indoor side from the annular flat portion 16. I have.

  With this configuration, the annular groove portion 13 accommodates the distal end surface side portion of the burring 21 so as to bite in the distal direction, the tapered cylindrical outer surface portion 14 is in close contact with the tapered cylindrical inner surface portion 21a of the burring 21, and the arc rib 15 is The annular flat portion 16 is in close contact with the outer surface of the vehicle body panel 20. Further, the auxiliary seal portion 17 strongly adheres to the vehicle body panel 20 at a position surrounding the annular flat portion 16 in a state where the arc rib 15 is pushed into the burring 21 and deformed.

  Therefore, in the panel fitting portion 12, the annular groove portion 13, the tapered cylindrical outer surface portion 14, the arcuate rib 15, the annular flat surface portion 16, and the auxiliary seal portion 17 are closely fitted and fitted to the burring 21, respectively, and the surface pressure can be secured. When the burring 21 of the panel 20 is inclined with respect to the surface of the vehicle body panel 20, the waterproofness can be improved.

  Further, when the distal end surface side portion of the burring 21 is accommodated in the annular groove portion, the distal end surface side portion of the burring 21 bites into the annular groove portion 13 in the distal direction, so that the adhesive force between the burring 21 and the grommet 10. And the water stoppage can be improved.

  The height from the annular flat portion 16 to the lower end of the tapered tube portion 11 may be smaller than the height of the burring 21 in the vertical direction.

  With this configuration, when the grommet 10 is assembled to the vehicle body panel 20, the burring 21 bites into the grommet 10 and a vertical force acts, so that the adhesion of the grommet 10 can be strengthened and the water stopping performance can be improved.

  The inner diameter of the burring 21 at the upper end of the tapered cylinder inner surface 21 a may be smaller than the minimum inner diameter of the annular groove 13.

  With this configuration, when the grommet 10 is assembled to the vehicle body panel 20, the burring 21 bites into the grommet 10 side to exert a horizontal force, so that the adhesion of the grommet 10 is strengthened and the water stopping performance can be improved.

  Further, the wire harness 1 according to the present embodiment includes a wire group W and a grommet 10, and the wire group W is inserted through the grommet 10, and the wire group W and the grommet 10 are adhered at the tip end of the grommet 10. In this configuration, the tape is connected and fixed by a tape fixing portion 22 wound with a tape.

  With this configuration, in the wire harness 1, the wire group W is inserted through the grommet 10, and the wire group W and the grommet 10 are connected and fixed by the tape fixing portion 22 formed by winding an adhesive tape on the tip end side of the grommet 10. After the grommet 10 is attached, when an external force acting laterally from the center of the grommet 10 continuously acts on the wire group W inserted through the grommet 10, the base end of the grommet 10 is deformed to a side pulled by the external force.

  In this case, the grommet 10 is on the side opposite to the deformed side, and the bite between the annular groove portion 13 and the tip end surface side portion of the burring 21 becomes shallow, but the close contact is not released, and the circular rib 15 Almost no deformation occurs, and a state in which the burring 21 closely adheres to the inner surface portion 21a of the tapered cylinder is maintained. For this reason, even if the auxiliary seal portion 17 and the exterior surface of the vehicle body panel 20 are weakly adhered to each other and moisture is transmitted to the annular flat portion from the weak portion, the moisture passes through the arc-shaped ribs 15 and the The water stoppage can be improved without reaching the indoor side of the panel 20.

  ADVANTAGE OF THE INVENTION According to this invention, when the burring of a vehicle body panel is inclined with respect to a panel surface, the grommet which can improve water stoppage and the wire harness using the same can be provided, and the grommet and the wire harness in general Useful for

DESCRIPTION OF SYMBOLS 1 Wire harness 10 Grommet 11 Tapered cylinder part 12 Panel fitting part (fitting part)
13 annular groove portion 14 tapered cylinder outer surface portion 15 arc-shaped rib (first seal portion)
16 annular flat part 17 auxiliary seal part (second seal part)
20 Body panel (partition panel)
21 Burring 21a Inner surface part of tapered cylinder 22 Tape fixing part L Reference tapered cylinder surface L1 Remaining part W Wire group

Claims (5)

The burring formed on the partition panel that separates the outside and the room is a tapered cylindrical shape that protrudes from the partition panel to the inside of the room, and the burring is inserted from the outside of the room with the electric wire group being inserted to stop water. Grommet attached to
Having a fitting portion fitted to the burring,
A first seal portion pressed against and closely attached to the inner surface of the tapered cylinder of the burring;
A second seal portion formed in an annular shape surrounding the annular flat portion at an outer peripheral end of the annular flat portion formed outside the first seal portion, and protruding more indoors than the annular flat portion;
A third seal portion which is formed on an outer peripheral end of an outer annular flat portion formed outside the second seal portion in an annular shape surrounding the outer annular flat portion, and protrudes outward and indoors from the outer annular flat portion. And
A grommet, wherein the height of the third seal portion in the vertical direction is higher than the height of the second seal portion in the vertical direction. The fitting portion includes an annular groove portion formed to accommodate a tip surface side portion of the burring when assembled to the burring,
2. The grommet according to claim 1, wherein the annular groove portion is configured such that, when the distal end surface side portion of the burring is accommodated, the distal end surface side portion of the burring bites in the distal direction. 3. . A tapered tube portion whose tube diameter gradually increases from the distal end side to the base end side in the insertion direction of the grommet,
3. The burring according to claim 2, wherein a height from the annular flat portion to a lower end of the tapered tubular portion is smaller than a vertical height of the burring so that the biting state occurs. 4. Grommet.   The inner diameter of the burring at the upper end of the inner surface of the tapered cylinder is configured to be smaller than the minimum inner diameter of the annular groove so that the biting state occurs. The grommet according to item 1.   An electric wire group and the grommet according to claim 1 to claim 4, wherein the electric wire group is inserted into the grommet, and the electric wire group and the grommet are formed by winding an adhesive tape on a tip end side of the grommet. A wire harness which is connected and fixed by a tape fixing portion.

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