JP6070467B2 - Grommet and wire harness with grommet - Google Patents

Description

  The present invention relates to a grommet for protecting a wire harness inserted through a hole in a panel.

  Conventionally, when a wire harness is routed between the engine room side and the vehicle compartment side through the through hole of the vehicle body panel that separates the engine room and the vehicle compartment of the automobile, the wire harness is interposed between the wire harness and the through hole of the vehicle body panel. By providing the grommet, it is possible to prevent water or dust from entering through the gap between the wire harness and the through hole.

  Among these types of grommets, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-228707, one that requires an operation of pushing a cylindrical portion having an outer diameter larger than the diameter of the through hole of the vehicle body panel into the through hole of the vehicle body panel is known. It has been.

  The grommet of Patent Literature 1 includes a small-diameter cylindrical portion and a large-diameter cylindrical portion continuous to the small-diameter cylindrical portion, and a vehicle body that fits on the outer peripheral surface of the through-hole of the vehicle body panel on the outer peripheral surface of the large-diameter cylindrical portion. A locking recess is provided, and a plurality of protrusions extending in the axial direction are radially provided. Each protrusion is provided with a stepped portion having a reduced diameter by cutting out the inclined side of the contact point having an outer diameter substantially the same as the diameter of the through hole, and smoothly protrudes from the stepped portion toward the inclined tip side. ing.

  In Patent Document 1, it is said that by providing such a protruding portion, workability when the grommet is attached to the through hole of the vehicle body panel is improved.

JP 2002-223516 A

  However, even if such a ridge is provided, the force to pull the grommet and push the grommet into the through hole of the vehicle body panel is directly transmitted to the portion where the vehicle body panel and the grommet contact, It is difficult to act as a force that causes the grommet to bend in the direction of reducing the diameter, and there is a possibility that sufficient insertability cannot be expected.

  Accordingly, an object of the present invention is to improve the insertability of the grommet when the grommet is attached to the hole of the panel.

In order to solve the above problem, the grommet according to the first aspect is a grommet for protecting a wire harness that is inserted into a hole formed in the panel, and an insertion hole through which the wire harness is inserted is formed. A small-diameter cylindrical portion that holds the wire harness in the insertion hole, a thin-walled portion that is formed so as to expand outward from the small-diameter cylindrical portion, and is formed so as to extend further outward from the thin-walled portion, A thick wall portion including a panel contact portion which is a portion having the same outer diameter as the hole diameter of the panel, and is opposite to the small diameter cylindrical portion with respect to the thick wall portion in the insertion direction of the wire harness. And a large-diameter cylindrical portion in which a peripheral groove for fitting the inner peripheral edge portion of the hole of the panel is formed on the outer peripheral surface, and a connecting portion between the thin portion and the thick portion is, The wire her In the insertion direction of the scan is positioned on the side of the circumferential groove than the panel contact portion. Moreover, the grommet which concerns on a 1st aspect is further provided with the cyclic | annular protrusion by which diameter reduction was carried out sequentially so that the said thin part might be covered toward the said small diameter cylinder part side from the said thick part.

  The grommet which concerns on a 2nd aspect is a grommet which concerns on a 1st aspect, Comprising: The said large diameter cylinder part is opposite to the said small diameter cylinder part with respect to the said thick part in the insertion direction of the said wire harness. A panel clamping part is formed on the side, and the circumferential groove is formed between the thick part and the panel clamping part.

The grommet which concerns on a 3rd aspect is a grommet which concerns on the 1st or 2nd aspect, Comprising: The some standing part which is standingly arranged in the outer peripheral surface of the said thin part, and supporting the said annular protrusion is provided. Yes.

The wire harness with a grommet which concerns on a 4th aspect is provided with the grommet which concerns on any one 1st to 3rd aspect, and the wire harness which is penetrated by the said grommet and is hold | maintained.

According to the grommet which concerns on a 1st aspect, since the connection part of a thick part and a thin part is provided in the surrounding groove side rather than the panel contact part in the insertion direction of a wire harness, the panel and the grommet contacted Later, the force that pulls the small-diameter cylindrical portion and pushes it into the through-hole of the panel easily acts as a force in the direction in which the diameter of the grommet is reduced. Therefore, it becomes easier to bend in the direction in which the diameter of the grommet is reduced, and the insertability of the grommet into the through hole of the panel can be improved. In addition, since it further includes an annular protrusion that is sequentially reduced in diameter so as to cover the thin wall portion, when the grommet is attached to the through hole of the panel, the central axis of the through hole of the panel and the central axis of the cylinder portion of the grommet Even in the case of misalignment, the grommet can be inserted smoothly.

  According to the grommet which concerns on a 2nd aspect, since the surrounding groove is formed between the thick part and the panel clamping part, when a panel is inserted by the surrounding groove, it can hold | maintain a panel more firmly. it can.

According to the grommet which concerns on a 3rd aspect, since the standing part which supports an annular protrusion is provided, when an annular protrusion and a panel contact, it suppresses that an annular protrusion is dented in the thin part side. can do.

According to the wire harness with a grommet which concerns on a 4th aspect, since the connection part of a thick part and a thin part is provided in the circumferential groove side rather than the panel contact part in the insertion direction of a wire harness, a panel and a grommet The force that pulls the small-diameter cylindrical portion after the contact and pushes it into the through-hole of the panel easily acts as a force in the direction of reducing the diameter of the grommet. Therefore, it becomes easier to bend in the direction in which the diameter of the grommet is reduced, and the insertability of the grommet into the through hole of the panel can be improved.

It is a perspective view which shows the grommet which concerns on embodiment. It is sectional drawing which cut | disconnected the grommet of FIG. 1 in the insertion direction of a wire harness. It is the same direction as Drawing 2, and it is a sectional view cut in another side. It is a figure which shows the wire harness with a grommet which penetrated the wire harness to the grommet of FIG. It is a figure explaining a mode that the grommet of FIG. 1 is mounted | worn in the through-hole of a panel. It is a figure explaining a mode that the grommet is further pulled by the small diameter cylinder part side from the state in FIG. It is a figure explaining a mode that the conventional grommet is mounted | worn in the through-hole of a panel. It is sectional drawing which shows the grommet which concerns on a modification.

<1. Configuration of Grommet 20>
Hereinafter, the grommet 20 according to the embodiment will be described. FIG. 1 is a perspective view showing a grommet 20 according to the embodiment. 2 is a cross-sectional view when the grommet 20 of FIG. 1 is cut along the insertion direction of the wire harness 18, and FIG. 3 is a cross-sectional view when cut along another surface in the same direction as FIG. It is. 4 is a view of a grommet-equipped wire harness 21 in which the wire harness 18 is inserted into the grommet 20 of FIG. 1, and the grommet 20 is shown in a sectional view cut along the same plane as FIG.

  The grommet 20 is attached to, for example, the hole 12 (through hole) formed in the vehicle body panel 10 while being attached to the wire harness 18.

  Here, the vehicle body panel 10 is a substantially plate-like member that partitions a space in the vehicle. As the vehicle body panel 10, for example, a panel that partitions a vehicle compartment and an engine room is assumed. The hole 12 formed in the vehicle body panel 10 is circular here, but may have other shapes (such as an ellipse, an ellipse, or a polygon).

  The inner peripheral edge portion 14 of the hole 12 may be subjected to processing that rises toward the one main surface side of the vehicle body panel 10, so-called burring processing, or such processing may not be performed. . When burring is performed, the inner peripheral edge portion 14 of the hole 12 can be made thick. In addition, the diameter of the hole 12 when burring is performed is the diameter of the inner peripheral edge portion 14 that first comes into contact with the grommet 20.

  The wire harness 18 includes a plurality of electric wires bundled together. The wire harness 18 is a member that electrically connects electrical devices installed in two spaces defined by the vehicle body panel 10 by being disposed through the hole 12 of the vehicle body panel 10. is there.

  The grommet 20 is a protective member that protects the wire harness 18 that is passed through the hole 12 of the vehicle body panel 10 from the outside, particularly from the inner peripheral edge 14 of the hole 12, and between the two spaces defined by the vehicle body panel 10. It is also a waterproofing member that prevents water and so on from coming and going. The grommet 20 is made of, for example, an elastomer (rubber, silicone, or an elastic material such as a synthetic resin material), and has a small-diameter cylindrical portion 22, a large-diameter cylindrical portion 30, an annular protrusion 42, and a standing portion 44. And.

  The small diameter cylindrical portion 22 is a portion of a cylindrical body that forms an insertion hole 22H through which the wire harness 18 is inserted. The opening of the insertion hole 22H is set smaller (here, slightly smaller) than the cross section of the wire harness 18. A plurality of annular protrusions are formed on the inner peripheral surface of the insertion hole 22H at intervals along the direction of the insertion hole 22H.

  When the small-diameter cylindrical portion 22 is elastically deformed so as to expand the hole diameter of the insertion hole 22H, the wire harness 18 can be inserted into the insertion hole 22H. After the wire harness 18 is inserted, the small diameter cylindrical portion 22 contracts, so that the wire harness 18 is fastened and fixed to the small diameter cylindrical portion 22.

  A fixing piece 24 is formed at one end of the insertion hole 22H of the small-diameter cylindrical portion 22 by forming a cut 23 cut along the insertion direction from the tip portion. In a state where the wire harness 18 is inserted through the small diameter cylindrical portion 22, for example, the adhesive tape 25 is wound around the portion where the cut 23 of the small diameter cylindrical portion 22 is formed, the fixed piece 24, and the wire harness 18.

  In this way, the small diameter cylindrical portion 22 is fastened and fixed to the wire harness 18, and the adhesive tape 25 is wound around the fixing piece 24 and the wire harness 18, thereby causing the small diameter cylindrical portion 22 to be wound. The wire harness 18 is fixed.

  Moreover, since the small diameter cylinder part 22 is clamped with respect to the wire harness 18, the infiltration of the water which passed between the small diameter cylinder part 22 and the wire harness 18 is suppressed. The large-diameter cylindrical portion 30 is formed so as to expand outward from the small-diameter cylindrical portion 22, has a thin portion 50, a thick portion 40, and a panel clamping portion 60, and a circumferential groove 32 is formed on the outer peripheral surface. . Here, the large-diameter cylindrical portion 30 is formed in the order of the thin-walled portion 50, the thick-walled portion 40, the connecting portion 61, and the panel clamping portion 60 from the small-diameter cylindrical portion 22 side along the insertion direction of the wire harness 18. . In addition, by forming a shape in which the outer peripheral portion between the thick portion 40 and the panel sandwiching portion 60 is partially recessed, the periphery having the connecting portion 61 between the thick portion 40 and the panel sandwiching portion 60 as a bottom portion. A groove 32 is formed.

  The outer shape of the large-diameter cylindrical portion 30 is circular corresponding to the shape (circular shape) of the hole 12 of the vehicle body panel 10. The circumferential groove 32 is an annular recess formed in the outer peripheral surface of the large-diameter cylindrical portion 30 in order to fit the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10. It is formed between the part 60.

  The groove width of the circumferential groove 32 is set to a width that can fit the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10 without rattling, and specifically, is the same as the thickness of the vehicle body panel 10 or slightly more than that. Set to be larger.

  The thin portion 50 is a portion formed so as to expand outward from the end portion on the small diameter cylindrical portion 22 side. More specifically, the thin-walled portion 50 is formed on one side of the small-diameter cylindrical portion 22 in the axial direction from the end portion of the small-diameter cylindrical portion 22 opposite to the end where the notch 23 is formed (the fixed piece 24 is This is a portion formed in a tapered shape so as to gradually expand in diameter toward the opposite side of the formed end). Here, the thickness of the thin portion 50 is uniform as a whole, but there may be a part that is thick, and the thickness gradually increases toward the outside or gradually decreases toward the outside. May be. The outer peripheral part connected with the thick part 40 among the thin parts 50 should just be thinner than the thick part 40.

  The thin portion 50 is formed so that the maximum outer diameter is smaller than the diameter of the hole 12 of the vehicle body panel 10. That is, the grommet 20 is formed so as not to contact the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10 when the grommet 20 is attached to the hole 12 of the vehicle body panel 10.

  The thick portion 40 is a portion of the large-diameter cylindrical portion 30 that is formed so as to extend further outward from the thin portion 50. More specifically, here, one end in the axial direction of the small-diameter cylindrical portion 22 (the fixed piece 24 is formed) from the end opposite to the end connected to the small-diameter cylindrical portion 22 in the thin-walled portion 50. The portion is formed in a tapered shape so that the diameter is gradually increased toward the opposite side of the end portion. Here, the thickness of the thick portion 40 gradually decreases from the thin portion 50 toward the outer peripheral side, but may be uniform as a whole or may gradually increase toward the outer peripheral side. Good. Further, there may be a portion that is partially thickened. The thickness of the thick part 40 should just be thicker than the outer peripheral part connected with the thick part 40 among the thin parts 50, as mentioned above.

  Further, the outer surface of the thick portion 40 gradually increases from the connecting portion 51 to the thin portion 50 to an outer diameter smaller than the diameter of the hole 12 of the vehicle body panel 10 to an outer diameter larger than the diameter of the hole 12. It is formed as follows. For this reason, the outer surface of the thick portion 40 includes a panel contact portion 40T that is an annular portion having the same outer diameter as the diameter of the hole 12 of the vehicle body panel 10.

  When the grommet 20 is attached to the hole 12 of the vehicle body panel 10 in a state where the central axis of the hole 12 of the vehicle body panel 10 and the central axis of the grommet 20 coincide with each other, the panel contact portion 40T It is also a portion that first contacts the inner peripheral edge 14 of the hole 12 of the panel 10. Therefore, when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10, the panel contact portion 40T can be inserted without applying a large force. However, after the grommet 20 and the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10 come into contact with each other at the panel contact portion 40T, it is necessary to apply a force for insertion.

  The connecting portion 51 between the thin portion 50 and the thick portion 40 is formed so as to be located closer to the circumferential groove 32 than the panel contact portion 40T in the insertion direction of the wire harness 18. More specifically, in the large diameter cylindrical portion 30, the thin portion 50 and the thick portion 40 are connected to the inner peripheral side between the panel contact portion 40 </ b> T and the circumferential groove 32 in the insertion direction of the wire harness 18. The part 51 is provided. But it is not essential that the connection part 51 is provided between the panel contact part 40T and the circumferential groove 32 in the insertion direction of the wire harness 18. As will be described later, if the connecting portion 51 is positioned closer to the circumferential groove 32 than the panel contact portion 40T in the insertion direction of the wire harness 18, the insertability of the grommet 20 can be improved.

  Further, here, the outermost portion in the radial direction of the thick portion 40 is formed in an annular surface substantially parallel to the insertion direction of the wire harness 18 and is formed so that the outer diameter is substantially constant. ing. A circumferential groove 32 is formed in a portion of the thick portion 40 having a substantially constant outer diameter. But the thin part may be formed so that it may spread further outward from the thick part 40, and the circumferential groove 32 may be formed in this thin part. However, if the circumferential groove 32 is formed in the thick wall portion 40, when the inner circumferential edge portion 14 of the hole 12 of the vehicle body panel 10 is fitted into the circumferential groove 32, the thick wall portion 40 makes the inner circumferential edge portion 14 more It can be held firmly.

  The panel clamping portion 60 is a portion that holds the inner peripheral edge portion 14 with the thick portion 40 when the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10 is fitted into the circumferential groove 32. The panel clamping part 60 is connected to the thick part 40 via the connecting part 61. Here, the outer diameter of the panel clamping part 60 is formed larger than the thick part 40, but may be smaller than the thick part 40 or the same. That is, it is only necessary to form the outer circumferential groove 32 to be larger than the outer diameter and to contact the inner peripheral edge portion 14 on one surface.

  In addition, the large diameter cylindrical portion 30 is formed with an opening 30H wider than the insertion hole 22H. In the grommet 20 according to the present embodiment, the opening 30H of the large diameter cylindrical portion 30 is continuous from the other end of the insertion hole 22H of the small diameter cylindrical portion 22 so as to expand outward, and the opening 30H and the insertion hole 22H are connected. It is communicated. For this reason, the wire harness 18 passed through the insertion hole 22H is exposed to the outside of the grommet 20 through the opening 30H.

  The annular protrusion 42 is formed so as to be gradually reduced in diameter from the outer peripheral surface of the thick portion 40 toward the small diameter cylindrical portion 22, and the outer peripheral surface of the thin portion 50 is spaced from the thin portion 50. It is formed so as to cover. The outer peripheral surface of the annular protrusion 42 and the outer peripheral surface of the thick portion 40 are continuous with each other. Further, a gap is also provided between the annular protrusion 42 and the small diameter cylindrical portion 22. That is, the end of the annular protrusion 42 that extends to the opposite side of the end connected to the thick portion 40 is formed so as not to be connected to either the small diameter cylindrical portion 22 or the thin portion 50. However, the annular protrusion 42 may have a portion partially connected to the small-diameter cylindrical portion 22 or the thin portion 50.

  Although the thickness of the annular protrusion 42 is gradually reduced toward the small-diameter cylindrical portion 22, it may be the same thickness or may have a part that is thick. In short, the annular protrusion 42 is in contact with the panel when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10 with the central axis of the hole 12 of the vehicle body panel 10 and the central axis of the grommet 20 not matching. Any shape that can smoothly guide the inner peripheral edge 14 of the hole 12 of the vehicle body panel 10 to the portion 40T is acceptable.

  Further, such an annular protrusion 42 is not essential, but is preferably provided. When the annular protrusion 42 is provided, even when the central axis of the hole 12 of the vehicle body panel 10 and the central axis of the grommet 20 are shifted when the grommet 20 is inserted into the hole 12 of the vehicle body panel 10, the vehicle body panel Since the inner peripheral edge portion 14 of the ten holes 12 smoothly moves along the outer peripheral surface of the annular protrusion 42, both central axes can be made coincident with each other.

  Although not shown in the figure, the annular protrusion 42 may be a protrusion that is partially cut and not annular. However, if the projections are provided so as to have an annular shape, the center axis of the hole 12 of the vehicle body panel 10 and the center axis of the grommet 20 are shifted when the grommet 20 is inserted into the hole 12 of the vehicle body panel 10. Even in this case, the entire circumference of the inner peripheral edge 14 of the hole 12 of the vehicle body panel 10 can be contacted.

  The plurality of standing portions 44 are provided on the outer peripheral surface of the thin portion 50 and are formed to support the annular protrusion 42. In this embodiment, it is provided at four positions that are symmetric with respect to the central axis of the large-diameter cylindrical portion 30, but the position and number provided are not limited to this. However, it is preferable that the standing portion 44 is formed so as to partially support the annular protrusion 42 on the outer periphery.

  Here, the standing portion 44 is provided so as to completely fill the gap between the annular protrusion 42 and the thin portion 50 from the end of the thick portion 40 along the radial direction of the thin portion 50. However, it may be formed so as to partially fill the gap along the radial direction of the thin portion 50.

  In short, when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10 in a state where the central axis of the hole 12 of the vehicle body panel 10 and the central axis of the grommet 20 do not coincide with each other, Even if 42 and the inner peripheral edge part 14 of the hole 12 of the vehicle body panel 10 contact, it is good to be able to support the annular protrusion 42 so as not to be recessed.

  However, such a standing portion 44 is not essential, but is preferably provided. When the standing portion 44 is provided, when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10, the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10 comes into contact with the annular protrusion 42 and the annular protrusion It can suppress that 42 dents.

  A portion for inserting and holding the wire harness may be formed on the inner peripheral portion of the large-diameter cylindrical portion 30.

<2. Operation during installation in panel hole>
FIGS. 5 and 6 are views for explaining how the grommet 20 according to the present embodiment is mounted in the hole 12 of the vehicle body panel 10. Specifically, FIG. 5 shows a panel contact portion when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10 with the central axis of the hole 12 of the vehicle body panel 10 and the central axis of the grommet 20 aligned. It is the figure which showed a mode that 40T and the inner peripheral edge part 14 of the hole 12 of the vehicle body panel 10 contact | abut first. 6 is a view showing a state where the grommet 20 is further pulled in the insertion direction of the wire harness 18 and the grommet 20 is bent in the reduced diameter direction from the state of FIG. FIG. 7 is a view for explaining how the conventional grommet 120 is mounted in the hole 12 of the vehicle body panel 10.

  In FIG. 5, the force transmitted to the grommet 20 when the small diameter cylindrical portion 22 is held and the grommet 20 is pulled in the insertion direction of the wire harness 18 is transmitted to the panel contact portion 40T before the thin wall portion 50 and the thick wall portion. It is transmitted to the connecting part 51 with 40. For this reason, in the vicinity of the connecting portion 51, the force F <b> 1 acts in the direction toward the small diameter cylindrical portion 22 along the extending direction of the thin portion 50. And since the connection part 51 is provided in the circumferential groove 32 side rather than the panel contact part 40T in the insertion direction of the wire harness 18, around the panel contact part 40T by the force F1 transmitted to the connection part 51. In the large diameter cylindrical portion 30, a rotational moment is generated that rotates the portion closer to the circumferential groove 32 than the panel contact portion 40T in the direction in which the grommet 20 reduces the diameter (counterclockwise in the cross-sectional view of FIG. 5).

  As a result, as shown in FIG. 6, the grommet 20 enters the hole 12 of the vehicle body panel 10 because the thick portion 40 between the panel contact portion 40T and the circumferential groove 32 is easily bent in the direction of reducing the diameter. It becomes easy. Therefore, the insertability of the grommet into the hole 12 of the vehicle body panel 10 can be improved.

  On the other hand, in the conventional grommet 120, the large-diameter cylindrical portion 130 is formed so as to gradually increase in diameter from the small-diameter cylindrical portion 122, and from the small-diameter cylindrical portion 122 side to the outermost diameter portion past the panel contact portion 40T. The cross-sectional shape is formed so as to be a straight line. When the grommet 120 is mounted in the hole 12 of the vehicle body panel 10, the force generated when the grommet 120 is pulled in the insertion direction of the wire harness 18 while holding the small diameter cylindrical portion 122 as in FIG. It is transmitted to the contact part 40T in a straight line. At this time, on the side of the small diameter cylindrical portion 122 in the large diameter cylindrical portion 130 in the vicinity of the panel contact portion 40T, the force F2 acts in a direction toward the small diameter cylindrical portion 122 along the extending direction of the large diameter cylindrical portion 130. . For this reason, a rotating moment that rotates the grommet 120 in the direction of reducing the diameter of the grommet 120 (counterclockwise in the cross-sectional view of FIG. 7) hardly occurs around the panel contact portion 40T. Therefore, the conventional grommet 120 is difficult to bend in the direction of reducing the diameter.

<3. Effect>
According to the grommet 20 and the wire harness 21 with the grommet according to the present embodiment, the thin-walled portion 50 and the thick-walled portion 40 are formed in the large-diameter cylindrical portion 30, and the connecting portion 51 between the thin-walled portion 50 and the thick-walled portion 40 is a wire. In the insertion direction of the harness 18, the harness 18 is provided closer to the circumferential groove 32 than the panel contact portion 40 </ b> T included in the thick portion 40. For this reason, when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10, the pulling force is transmitted to the panel contact portion 40 </ b> T via the connecting portion 51 by holding the small diameter cylindrical portion 22, thereby increasing the diameter. Of the cylindrical portion 30, the portion having an outer diameter larger than the diameter of the hole 12 of the vehicle body panel 10 is easily bent in the direction of reducing the diameter. Therefore, the mounting property of the grommet 20 can be improved.

  Further, according to the grommet 20 according to the present embodiment, the large-diameter cylindrical portion 30 is formed with the panel clamping portion 60 on the side opposite to the small-diameter cylindrical portion 22 with respect to the thick-walled portion 40 in the insertion direction of the wire harness 18. Since the circumferential groove 32 is formed between the thick wall portion 40 and the panel holding portion 60, the thick wall portion 40 is inserted when the inner peripheral edge portion 14 of the hole 12 of the vehicle body panel 10 is fitted into the circumferential groove 32. And the panel clamping part 60 can hold the inner peripheral edge part 14 firmly.

  Further, according to the grommet 20 according to the present embodiment, the annular protrusion 42 is provided, so that when the grommet 20 is inserted into the hole 12 of the vehicle body panel 10, the central axis of the hole 12 of the vehicle body panel 10 and the grommet. Even when the center axis 20 is deviated, the inner peripheral edge 14 of the hole 12 of the vehicle body panel 10 moves smoothly along the outer peripheral surface of the annular protrusion 42, so that both the central axes can be matched.

  Further, according to the grommet 20 according to the present embodiment, the upright portion 44 that supports the annular protrusion 42 is provided, so that when the grommet 20 is mounted in the hole 12 of the vehicle body panel 10, the vehicle body panel 10. When the inner peripheral edge 14 of the hole 12 comes into contact with the annular protrusion 42, the annular protrusion 42 can be prevented from being recessed.

<4. Modification>
FIG. 8 is a view showing a grommet 20A according to a modification. FIG. 8 shows a cross-sectional view when cut along the insertion direction of the wire harness 18. In addition, in the following description, the same code | symbol is attached | subjected about the element which has a function similar to the element of the grommet 20 which concerns on embodiment, and the description is abbreviate | omitted.

  The grommet 20A is different from the grommet 20 in that the annular protrusion 42 and the standing portion 44 are not provided. Even in such a grommet 20A, the thin-walled portion 50 and the thick-walled portion 40 are formed in the large-diameter cylindrical portion 30, and the connection portion 51 between the thin-walled portion 50 and the thick-walled portion 40 is thick in the insertion direction of the wire harness 18. The panel contact portion 40 </ b> T included in the portion 40 is provided closer to the circumferential groove 32. For this reason, when the grommet 20A is mounted in the hole 12 of the vehicle body panel 10, the force that holds and pulls the small-diameter cylindrical portion 22 is transmitted to the panel contact portion 40T via the connecting portion 51. Of the portion 30, the portion having an outer diameter larger than the diameter of the hole 12 of the vehicle body panel 10 is easily bent in the direction of reducing the diameter. Therefore, the mounting property of the grommet 20A can be improved.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Body panel 12 Hole 14 Inner peripheral edge 18 Wire harness 20 Grommet 21 Wire harness with grommet 22 Small diameter cylinder part 22H Insertion hole 30 Large diameter cylinder part 32 Circumferential groove 40 Thick part 40T Panel contact part 42 Annular protrusion 44 Standing Part 50 Thin part 51 Connection part 60 Panel clamping part F1, F2 Force

Claims (4)

A grommet for protecting a wire harness inserted through a hole formed in a panel,
An insertion hole through which the wire harness is inserted is formed, and a small-diameter cylindrical portion that holds the wire harness in the insertion hole;
A thin-walled portion formed to extend outward from the small-diameter cylindrical portion, and a panel contact portion that is formed to extend further outward from the thin-walled portion and has the same outer diameter as the diameter of the hole of the panel In the insertion direction of the wire harness, the inner peripheral edge portion of the hole of the panel is fitted on the outer peripheral surface on the opposite side of the small diameter cylindrical portion with respect to the thick wall portion. A large-diameter cylindrical portion in which a circumferential groove is formed,
With
The connection part of the thin part and the thick part is located closer to the circumferential groove than the panel contact part in the insertion direction of the wire harness ,
A grommet further comprising an annular protrusion having a reduced diameter so as to cover the thin portion from the thick portion toward the small-diameter cylindrical portion . The grommet according to claim 1,
In the insertion direction of the wire harness, a panel clamping portion is formed on the large diameter cylindrical portion on the opposite side of the small diameter cylindrical portion with respect to the thick wall portion, and the thick wall portion and the panel clamping portion are A grommet having the circumferential groove formed therebetween. The grommet according to claim 1 or 2 , wherein
A grommet that is provided on the outer peripheral surface of the thin-walled portion and is provided with a plurality of standing portions that support the annular protrusion. The grommet according to any one of claims 1 to 3 ,
A wire harness inserted through and held by the grommet;
A wire harness with a grommet.

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