JP2014096879A - Grommet and wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet with excellent water cut property, facilitating work for inserting a wire harness body into a cylindrical portion of a grommet, and capable of protecting over the length as long as possible.SOLUTION: A grommet 20 includes a panel mounting part 22, and a cylindrical portion 30 provided in the panel mounting part 22 integrally therewith, and into which the wire harness body can be inserted. The cylindrical portion 30 is formed with annular groves 43 and 45 recessed in the outer peripheral side or the inner peripheral side, and a bellows-like portion 40 becoming a bellows by bending at the annular groves 43 and 45. In the bottom of the annular groves 43 and 45, grooves 43 and 45g further recessed with respect to the extension of both sides of the bottom are formed.

Description

  The present invention relates to a technique for stopping water by passing a wire harness body through a grommet.

  Generally, the grommet attached to the wire harness body includes a panel attachment part attached to the mounting panel and a cylinder part through which the wire harness body is inserted and fixed.

  Further, when the wire harness main body is inserted into the cylindrical portion, a connector is already attached to the end of the wire harness main body. For this reason, in order to insert a wire harness main body in a cylinder part, it is necessary to open a cylinder part large. Therefore, in a state where a plurality of expanding claws are inserted into the cylinder portion, the plurality of expanding claws are moved in a direction to open each other, so that the cylinder portion is greatly expanded. The work to insert is carried out.

  Here, in order to protect the wire harness main body in the grommet, a configuration in which the cylindrical portion is made as long as possible has been proposed. However, if the tube portion is lengthened, the expanding claws cannot be disposed over the entire longitudinal direction of the tube portion, and a situation where the expanding operation cannot be performed may occur. If the expansion claw is lengthened according to the length of the cylinder portion, a large force is applied to the expansion claw, and the expansion claw may be damaged.

  Here, patent document 1 is disclosing the grommet which formed the bellows-shaped part in the cylinder part.

  Patent Document 2 discloses a configuration in which a grommet is cut in the axial direction. In this grommet, the wire harness body can be easily inserted and arranged in the insertion hole via the cutting portion.

JP 2008-42968 A Japanese Utility Model Publication No. 5-83949

  In the grommet disclosed in Patent Document 1, the cylindrical portion can be shortened in the longitudinal direction using the bellows-like portion. For this reason, even if it does not lengthen the expansion claw, the expansion claw can be disposed over the entire longitudinal direction of the cylindrical portion, and the expansion operation of the cylindrical portion and the insertion operation of the wire harness body can be easily performed.

  However, with the technique disclosed in Patent Document 1, the irregular shape of the bellows-like portion tends to remain even after the tube portion is covered with the wire harness body, and it is difficult to sufficiently extend the bellows-like portion. For this reason, it is difficult to protect a wire harness main body over a dimension as long as possible with a cylinder part.

  In addition, the grommet disclosed in Patent Document 2 has a problem that the axial cut portion is formed, resulting in inferior waterstop.

  Therefore, the present invention can easily perform the operation of inserting the wire harness main body into the cylindrical portion of the grommet, can protect the wire harness main body over as long a dimension as possible, and is excellent in water stoppage. The purpose is to provide.

  In order to solve the above problems, the first aspect is a grommet attached to the attachment panel in a state of being attached to the wire harness body, and a panel attachment portion attachable to an attachment hole formed in the attachment panel; A cylindrical portion integrally provided in the panel mounting portion and capable of inserting and holding the wire harness main body, and an annular groove that is recessed toward the outer peripheral side or the inner peripheral side is formed in the cylindrical portion, A bellows-like portion having a bellows shape is formed by bending in the groove, and a concave groove is formed in the bottom portion of the annular groove, which is recessed from the extension of both side portions of the bottom portion.

  A 2nd aspect is a grommet which concerns on a 1st aspect, Comprising: The thick part is formed in the part adjacent to the other side part of the said ditch | groove among the said bellows-shaped part.

  A 3rd aspect is a grommet which concerns on a 2nd aspect, Comprising: It protrudes so that the cross-sectional shape in the axial direction of the said bellows-like part may exhibit an arc shape among the bellows-like parts. By forming into a shape, the thick part is formed.

  A 4th aspect is a grommet which concerns on any one 1st-3rd aspect, Comprising: The inner peripheral side annular groove dented toward the outer peripheral side in the inner peripheral surface of the said cylinder part in the said bellows-like part. And a pair of outer peripheral annular grooves that are recessed toward the inner peripheral side of the cylindrical part at a position sandwiching the inner peripheral annular groove in the axial direction of the bellows-shaped part on the outer peripheral surface of the cylindrical part, By bending the pair of outer peripheral side annular grooves and the inner peripheral side annular grooves, an annular convex part in which the cross-sectional shape in the axial direction of the bellows-like part forms a V shape toward the outer peripheral side is formed, The concave groove is formed in at least one of a pair of outer circumferential annular grooves and the inner circumferential annular grooves.

  The wire harness which concerns on a 5th aspect is equipped with a wire harness main body and the grommet as described in any one of Claims 1-4 with which the said wire harness main body was mounted | worn.

  According to the 1st aspect, since the bellows-like part is formed in the cylinder part, the length dimension of a cylinder part can be made shorter than the length dimension for which protection is desired with respect to a wire harness main body. And the diameter of a short cylinder part can be expanded comparatively easily using an expansion claw etc., and the operation | work which penetrates a wire harness main body to a cylinder part can be performed easily. In addition, an annular groove that is recessed toward the outer peripheral side or the inner peripheral side is formed in the cylindrical part, and a bellows-like part that exhibits a bellows shape is formed by bending at the annular groove, and at the bottom of the annular groove, Since the concave groove which is dented more than on both side partial extensions of the bottom is formed, the bent portion can be easily extended. For this reason, the said cylinder part can be easily extended in the state which covered the wire harness main body, and the wire harness main body can be protected over as long a dimension as possible. Moreover, since a cylinder part covers the whole outer periphery of a wire harness main body seamlessly, it is excellent also in water stop.

  According to the second aspect, since the thick portion is formed in a portion adjacent to the opposite side portion of the concave groove in the bellows-shaped portion, the concave groove is formed in a state where the cylindrical portion is extended. The portion can be filled with the thick portion. Thereby, the thickness of a cylinder part can be made as uniform as possible in the state which covered the cylinder part on the wire harness main body.

  According to a third aspect, by forming the opposite side portion of the annular groove in the bellows-like portion into a shape protruding so that a cross-sectional shape in the axial direction of the bellows-like portion exhibits an arc shape, Since the portion is formed, the thickness of the tubular portion can be made more uniform in a state where the tubular portion is covered with the wire harness body.

  According to the 4th aspect, since the annular convex part which makes V shape is formed in the bellows-like part, the length dimension of a cylinder part is more effective than the length dimension in which protection is desired with respect to a wire harness main body. Can be shortened. Moreover, in the state which covered the cylinder part on the wire harness main body, the said cylinder part can be extended longer and a wire harness main body can be protected over a longer dimension.

  According to the 5th aspect, since the bellows-like part is formed in the cylinder part, the length dimension of a cylinder part can be made shorter than the length dimension in which protection is desired with respect to a wire harness main body. And the diameter of a short cylinder part can be expanded comparatively easily using an expansion claw etc., and the operation | work which penetrates a wire harness main body to a cylinder part can be performed easily. Further, the bellows-like portion is formed with an annular groove that is recessed toward the outer peripheral side or the inner peripheral side, and has a bellows shape by bending at the annular groove, so that the bent portion can be easily extended. it can. For this reason, the said cylinder part can be easily extended in the state which covered the wire harness main body, and the wire harness main body can be protected over as long a dimension as possible. Moreover, since a cylinder part covers the whole outer periphery of a wire harness main body seamlessly, it is excellent also in water stop.

It is sectional drawing which shows the grommet which concerns on embodiment. It is a fragmentary sectional view of a grommet same as the above. It is explanatory drawing which shows the state which expanded the grommet. It is explanatory drawing which shows the state which expanded the grommet. It is sectional explanatory drawing which shows the state which mounted | wore the wire harness main body in the cylinder part. It is sectional explanatory drawing which shows the state which extended the cylinder part with which the wire harness main body was mounted | worn. It is explanatory drawing which shows the modification of a bellows-like part. It is explanatory drawing which shows the other modification of a bellows-like part.

  Hereinafter, the grommet and the wire harness according to the embodiment will be described.

  FIG. 1 is a cross-sectional view showing the grommet 20, and FIG. 2 is a partial cross-sectional view of the grommet 20.

  The grommet 20 is configured to be attachable to the attachment panel 11 while being attached to the wire harness body 18.

  Here, the wire harness body 18 is configured to include at least one electric wire. Here, the wire harness body 18 has a configuration in which a plurality of electric wires are bundled. The wire harness body 18 may be appropriately branched at other portions. An optical cable or the like may be disposed along the wire harness body 18. Usually, a connector for connection to an electrical device is attached to the end of the wire harness body 18. For this reason, when inserting the wire harness main body 18 through the grommet 20, it is necessary to expand it sufficiently larger than the diameter of the wire harness main body 18 so that the connector can be passed.

  The mounting panel 11 is a plate-like member through which the wire harness body 18 passes. Here, the mounting panel 11 is described assuming the mounting panel 11 that separates the engine room from the vehicle compartment. A mounting hole 12 is formed in the mounting panel 11. Here, the attachment hole 12 is formed in a circular hole, but may have another shape such as an ellipse.

  The grommet 20 is attached to a portion of the wire harness body 18 that passes through the attachment hole 12 and is attached and fixed to the attachment hole 12. In other words, the grommet 20 is attached to the wire harness main body 18, and the wire harness main body 18 is routed to the vehicle compartment side and the engine room side through the grommet 20 fixedly attached to the attachment hole 12. The grommet 20 has a role of protecting the wire harness main body 18 at a portion where the wire harness main body 18 passes through the attachment hole 12 and also stopping water from the engine room to the vehicle compartment.

  The grommet 20 includes a panel mounting portion 22 and a cylindrical portion 30, and the whole is integrally formed of an elastic material such as rubber. That is, the panel mounting part 22 and the cylinder part 30 are integrally molded by an injection mold or the like.

  The panel mounting portion 22 is formed in an annular shape having an outer diameter that is larger (slightly larger) than the inner diameter of the mounting hole 12. More specifically, the panel mounting part 22 includes a short cylindrical body part 24 and a closing part 28 that closes one side opening of the body part 24.

  A mounting recess 25 into which the peripheral edge of the mounting hole 12 is fitted is formed in an axially intermediate portion of the outer peripheral portion of the body portion 24. An annular contact portion 26 is formed on the outer peripheral portion of the body portion 24 on the side opposite to the closing portion 28 with respect to the mounting recess 25. An annular sealing portion 26 a is formed on the outer peripheral edge of the surface on the mounting recess 25 side of the annular contact portion 26. Then, by fitting the peripheral edge portion of the attachment hole 12 into the attachment recess 25 of the body portion 24, the panel attachment portion 22 is attached and fixed to the attachment hole 12 of the attachment panel 11. In this state, the cylindrical portion 30 protrudes to the one main surface side (the right side in FIG. 1) of the mounting hole 12. Further, the annular sealing portion 26 a is pressed against the other main surface (the left surface in FIG. 1) of the mounting panel 11, whereby a more reliable water stop between the mounting hole 12 and the panel mounting portion 22. Is planned.

  Further, the outer peripheral portion of the body portion 24 on the closed portion 28 side is formed in a guide portion 27 that gradually decreases in diameter toward the closed portion 28 side. When the panel mounting portion 22 is fitted into the mounting hole 12, the guide portion 27 comes into contact with the peripheral edge of the mounting hole 12 so that the panel mounting portion 22 can be easily inserted into the mounting hole 12. Yes.

  The cylinder part 30 is integrally provided in the panel mounting part 22, and is comprised so that the said wire harness main body 18 can be penetrated and hold | maintained.

  That is, the cylindrical portion 30 is formed so as to protrude outwardly from the panel mounting portion 22 in one axial direction, here, from the closing portion 28.

  Note that a cylindrical portion through which the wire harness main body 18 can be inserted may be formed in a portion of the panel mounting portion 22 opposite to the closing portion 28.

  The cylinder part 30 is provided with the 1st straight cylinder part 32, the 2nd straight cylinder part 34, and the bellows-like part 40 provided among these. Here, a short first straight cylindrical portion 32 is provided in a portion close to the panel mounting portion 22, a bellows-like portion 40 is provided on the distal end side thereof, and a second straight cylindrical portion 34 is further provided on the distal end side thereof. Yes. In a normal state where the tube portion 30 is not stretched, the tube portion 30 is set to a length dimension L (see FIG. 1). When the tube portion 30 is stretched so as to reduce the unevenness of the bellows-shaped portion 40, the length is larger than the length dimension L. It becomes the dimension La.

  The first straight cylinder part 32 and the second straight cylinder part 34 are each formed in a cylindrical shape in which the same inner diameter portion continues along the axial direction. The inner diameters of the first straight tube portion 32 and the second straight tube portion 34 are set to be smaller than the outer diameter of the wire harness main body 18, so that the wires are placed in the first straight tube portion 32 and the second straight tube portion 34. The harness body 18 can be disposed in a tightened state. In addition, the said straight cylinder parts 32 and 34 may be abbreviate | omitted and the whole cylinder part may be formed in the bellows-like part. In this case, the minimum inner diameter of the bellows-like portion 40 may be made smaller than the outer diameter of the wire harness main body 18 so that the bellows-like portion 40 can tighten the wire harness main body 18.

  The bellows-like portion 40 has a configuration in which an annular convex portion 42 whose cross-sectional shape in the axial direction is V-shaped toward the outer peripheral side is formed.

  An annular portion in the middle in the axial direction of the annular convex portion 42 protrudes in an annular shape toward the outer peripheral side of the cylindrical portion 30. An inner circumferential annular groove 43 that is recessed toward the side is formed. Further, the pair of annular portions on both sides in the axial direction of the annular convex portion 42 rises obliquely outward from the first straight cylindrical portion 32 or the second straight cylindrical portion 34, and accordingly, the inner circumference of the pair of annular portions On the surface, a pair of outer peripheral annular grooves 45 are formed on the outer peripheral surface of the cylindrical portion 30 and are recessed toward the inner peripheral side of the cylindrical portion 30 at a position sandwiching the inner peripheral annular groove 43 in the axial direction of the bellows-shaped portion 40. Yes.

  Therefore, the bellows-like portion 40 can also be regarded as having an annular convex portion 42 formed by bending a pair of outer peripheral side annular grooves 45 and the inner peripheral side annular groove 43.

  A concave groove 43 g is formed at the bottom of the inner circumferential annular groove 43. The recessed groove 43g is formed in an annular groove that is recessed from both side extended portions of the bottom of the inner circumferential annular groove 43.

  That is, the inner circumferential annular groove 43 has a V-shaped cross section in the axial direction of the bellows-like portion 40. And the concave groove 43g is formed so that it may be dented from the extended surface S to the said bottom part from the both sides | surfaces of frustoconical surface shape sandwiching the bottom part of the inner peripheral side annular groove 43. In other words, the concave groove 43g is formed in a shape in which the bottom of the inner circumferential annular groove 43 having a V shape is further cut. The concave groove 43g may have a simple cut shape, or may have a shape that gradually becomes narrower toward the bottom side.

  A concave groove 45 g is formed at the bottom of the outer peripheral annular groove 45. The concave groove 45g is formed in an annular groove that is recessed from both side extended portions of the bottom of the outer peripheral side annular groove 45.

  That is, the outer peripheral annular groove 45 has a V-shaped cross section in the axial direction of the bellows-like portion 40. And from the both side surfaces (the cylindrical outer peripheral surface of the first straight cylindrical portion 32 or the second straight cylindrical portion 34 and the truncated cone peripheral surface shape of the annular convex portion 42) sandwiching the bottom portion of the outer peripheral annular groove 45, the bottom portion A recessed groove 45g is formed so as to be recessed from the extended surface T. In other words, the concave groove 45g is formed in a shape in which the bottom of the outer peripheral side annular groove 45 having a V shape is further cut. The concave groove 45g may have a simple cut shape or a shape that gradually becomes narrower toward the bottom side.

  Moreover, the thick parts 44 and 46 are formed in the part adjacent to the opposite side part of the concave grooves 43g and 45g among the bellows-like parts 40. FIG.

  Here, a pair of annular thick portions 44, 44 are formed so as to sandwich the outer peripheral side portion of the annular convex portion 42 facing the concave groove 43 g from both sides in the axial direction of the bellows-like portion 40. Each of the thick portions 44, 44 protrudes from the extended surface U of the frustoconical peripheral surface on the outer peripheral side of the annular convex portion 42. In addition, the pair of thick portions 44 and 44 form an arc that is convex outward in the axial direction of the bellows-like portion 40 as a whole. Accordingly, the portion of the annular convex portion 42 where the concave groove 43g is formed is relatively thin, while the portion sandwiching the portion is relatively thick due to the formation of the thick portions 44, 44.

  In addition, a pair of annular thick portions 46, 46 are formed so as to sandwich the inner peripheral side portion facing the concave groove 45g of both end portions in the axial direction of the annular convex portion 42 from both sides in the axial direction of the bellows-like portion 40. ing. One thick part 46 protrudes from the inner peripheral surface of the first straight cylindrical part 32 or the second straight cylindrical part 34, and the other thick part 46 is on the truncated cone on the inner peripheral side of the annular convex part 42. It protrudes from the circumferential surface U. Further, the pair of thick portions 46, 46 as a whole draws an arc that is convex inward in the axial direction of the bellows-like portion 40. Accordingly, the portion of the annular convex portion 42 where the concave groove 45g is formed is relatively thin, while the portion sandwiching the portion has a thickness corresponding to the thick portions 46 and 46 formed therein.

  A procedure for attaching the grommet 20 to the wire harness body 18 will be described.

  First, as shown in FIGS. 3 and 4, the plurality of expanding claws 100 are inserted into the panel mounting portion 22 and the cylindrical portion 30, and the plurality of expanding claws 100 are moved in directions away from each other. Then, the panel mounting part 22 and the cylinder part 30 are expanded greatly to such an extent that the wire harness main body 18 and the connector of the edge part can be penetrated.

  When inserting the expansion claw 100 into the cylinder part 30, the cylinder part 30 is in the state of the length dimension L. And the expansion nail | claw 100 contact | abuts to the internal peripheral surface of the cylinder part 30 with this state, and the said cylinder part 30 is expanded greatly. For this reason, even if the cylinder part 30 is expanded by the expansion claws 100, the cylinder part 30 is maintained in the state of the length dimension L. Accordingly, as the expanding claw 100, a length dimension obtained by adding a length dimension corresponding to the panel mounting portion 22 to the length dimension L of the cylindrical portion 30, that is, a relatively short length dimension is used. it can.

  With the tubular portion 30 expanded as described above, the wire harness body 18 and the connector at the end thereof are inserted into the panel attachment portion 22 and the tubular portion 30, and the attachment target position of the wire harness body 18 is within the tubular portion 30. When it is disposed, the expanding claw 100 is pulled out from the tube portion 30 and the panel mounting portion 22.

  Then, the diameter of the cylindrical portion 30 and the panel mounting portion 22 is reduced to the original shape, and the wire harness body 18 is tightened while being inserted into the cylindrical portion 30. When the widening claw 100 is pulled out, the cylindrical portion 30 is deformed as it is, and in the state immediately after the widening claw 100 is pulled out, the annular convex portion 42 maintains a shape slightly protruding toward the outer peripheral side. The portion 30 is substantially in the length dimension L.

  Next, the outer periphery of the cylinder part 30 is pressed down. For example, the adhesive tape 110 is wound around the outer periphery of the tube part 30 to press the outer periphery of the tube part 30. Then, the annular convex portion 42 protruding to the outer peripheral side is pressed and the cylindrical portion 30 is deformed so as to be a straight cylindrical shape. Thereby, the cylinder part 30 deform | transforms so that it may extend in length dimension La. FIG. Thereby, the wire harness main body 18 can be protected by the cylindrical portion 30 having a relatively long length La. The adhesive tape 110 is preferably wound around the wire harness body 18 beyond the end of the cylindrical portion 30.

  As described above, the wire harness 10 is completed by attaching the grommet 20 to the wire harness body 18.

  And the wire harness 10 is assembled | attached to a vehicle etc. by mounting | wearing the said grommet 20 with the attachment hole 12 of the attachment panel 11. FIG.

  According to the grommet 20 and the wire harness 10 configured as described above, since the bellows-like portion 40 is formed in the cylindrical portion 30, the length L of the initial cylindrical portion 30 is set to the wire harness main body 18. It can be made shorter than the length La desired to be protected. And the cylinder part 30 of the state which is the short length dimension L can be expanded using the expansion nail | claw 100 grade | etc.,. At this time, as the expanding claws 100, a length shorter than the length dimension obtained by adding the length dimension corresponding to the panel mounting portion 22 to the length dimension La desired to be protected with respect to the wire harness body 18 can be used. . Therefore, the cylindrical portion 30 can be expanded using the existing expanding claw 100 or the like without changing the design such as increasing the length of the expanding claw 100. Moreover, if the length dimension of the expansion claw 100 is lengthened, the possibility of breakage of the expansion claw 100 is increased, but here, since the relatively short expansion claw 100 can be used, Less likely. Thereby, the operation | work which penetrates the wire harness main body 18 to the cylinder part 30 can be performed easily.

  In addition, after the wire harness body 18 is inserted into the cylindrical portion 30, the cylindrical portion 30 is deformed in a reduced diameter, and the bellows-shaped portion 40 is extended to make the cylindrical portion 30 have a relatively long length La. The wire harness body 18 can be protected by the dimension La. At this time, the cylindrical portion 30 is formed with annular grooves 43 and 45 that are recessed toward the outer peripheral side or the inner peripheral side, and the bellows-like portion 40 that has a bellows shape when bent by the annular grooves 43 and 45 is formed. In addition, recessed grooves 43g and 45g are formed in the bottom portions of the annular grooves 43 and 45, which are recessed more than on both side portion extensions of the bottom portions. For this reason, the inside portion of the bent corner of the bellows-like portion 40 is in a state of being divided. For this reason, the curved part of the bellows-like part 40 can be easily extended linearly, the cylindrical part 30 can be easily extended, and the wire harness main body 18 can be protected over as long a dimension La as possible. .

  Moreover, the cylinder part 30 is continuing in the circumferential direction, and covers the whole outer periphery of the wire harness main body 18 seamlessly. For this reason, it is excellent also in the water stop between the wire harness main body 18 and the grommet 20.

  Moreover, since the thick parts 44 and 46 are formed in the part adjacent to the axial direction of the bellows-like part 40 in the part on the opposite side of the concave grooves 43g and 45g in the bellows-like part, the bellows-like part 40 is extended. Thus, the space formed by the concave grooves 43g and 45g can be filled with the thick portion 44. Thereby, in the state which covered the cylinder part 30 on the wire harness main body 18, the thickness of the cylinder part 30 can be made as uniform as possible, and stabilization of a protection strength can be aimed at. Further, the surface of the cylindrical portion 30 can be made as flat as possible.

  In this case, the thick portions 44 and 46 are formed in the bellows-like portion adjacent to the opposite side portions of the concave grooves 43g and 45g in the axial direction of the bellows-like portion 40 from both sides. Is not required. The thick portion may be formed only in a portion of the bellows-like portion that is adjacent from one side in the axial direction of the bellows-like portion 40 to the opposite side portion of the concave groove.

  Further, the thick portion 44, 44 or the thick portion is formed by forming the opposite side portion of the annular groove 43 of the bellows-like portion 40 into a shape projecting so that the cross-sectional shape in the axial direction of the bellows-like portion 40 exhibits an arc shape. Since 46 and 46 are formed, the thickness of the cylinder part 30 can be made more uniform by making the opposite surface as gentle as possible in a state in which the annular groove 43 is extended linearly.

  Further, the bellows-like portion 40 has an inner peripheral side annular groove 43 that is recessed toward the outer peripheral side on the inner peripheral surface of the cylindrical portion 30, and an inner peripheral side annular shape in the axial direction of the bellows-like portion 40 on the outer peripheral surface of the cylindrical portion 30. A pair of outer peripheral side annular grooves 45 that are recessed toward the inner peripheral side of the cylindrical portion are formed at positions sandwiching the groove 43, and by bending between the pair of outer peripheral side annular grooves 45 and the inner peripheral side annular groove 43, Since the annular convex portion 42 having a V-shaped cross section in the axial direction of the bellows-like portion 40 toward the outer peripheral side is formed, as many portions as possible of the portion constituting the annular convex portion 42 are arranged on the axis of the cylindrical portion 30. It can be inclined with respect to the direction. Thereby, the length dimension L of the initial cylinder part 30 can be effectively made shorter than the length dimension La in which protection is desired for the wire harness body 18. Moreover, in the state which covered the wire part main body 18 with the cylinder part 30, the said cylinder part 30 can be extended longer, and the wire harness main body 18 can be protected over longer dimension La.

  When a plurality of annular grooves 43 and 45 are formed, it is not necessary that the concave grooves 43g and 45g are formed in all the annular grooves 43 and 45. It is sufficient that a concave groove is formed in at least one of the plurality of annular grooves 43 and 45.

  Moreover, although the said embodiment demonstrated the example in which the one annular convex part 42 which protrudes outside was formed, as shown in FIG. 7, there are two or more annular convex parts 126 which protrude outside (in FIG. 7, two are shown). ) May be formed. Also in this case, it is preferable that the concave grooves 143g and 145g are formed in the annular grooves 143 and 145, respectively. However, a concave groove may be formed in at least one of the annular grooves 143 and 145.

  An annular convex portion may be formed so as to protrude inward of the cylindrical portion, and a concave groove may be formed at the bottom of the annular groove for forming the annular convex portion (the axial direction of the cylindrical portion 30 in FIG. 7). (See the annular protrusion 226 in the middle).

  In the above embodiment, the annular convex portion 42 has been described as having a V-shaped cross section in the axial direction of the cylindrical portion 30, but it is not always necessary. For example, as shown in FIG. 8, an annular convex portion 326 may be formed so as to have a U-shaped cross section in the axial direction of the cylindrical portion 330. Even in this case, if the groove 343g is formed at the bottom of the annular protrusion 326 so as to be recessed from the extension of the inner curved surface of the annular protrusion 326, the annular protrusion 326 is formed for the same reason as described above. Accordingly, the bellows-like portion formed with the annular convex portion 326 can be easily extended.

  In addition, each structure demonstrated in the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  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 Wire harness 11 Mounting panel 12 Mounting hole 18 Wire harness main body 20 Grommet 22 Panel mounting part 30 Cylinder part 40 Bellows part 43 Inner peripheral side annular groove 43g Concave groove 44 Thick part 46 Thick part 45 Outer peripheral side annular groove 45g Concave groove

Claims (5)

A grommet that is attached to the mounting panel while being attached to the wire harness body,
A panel mounting portion that can be mounted in a mounting hole formed in the mounting panel;
A cylindrical portion provided integrally with the panel mounting portion and capable of inserting and holding the wire harness body;
With
An annular groove that is recessed toward the outer peripheral side or the inner peripheral side is formed in the cylindrical part, and a bellows-like part that exhibits a bellows shape is formed by bending in the annular groove,
A grommet in which a concave groove is formed in a bottom portion of the annular groove, which is recessed from both side portion extensions of the bottom portion. The grommet according to claim 1,
A grommet in which a thick portion is formed in a portion adjacent to the opposite side portion of the concave groove in the bellows-like portion. The grommet according to claim 2,
The thick portion is formed by forming the opposite side portion of the annular groove in the bellows-like portion into a shape protruding so that the cross-sectional shape in the axial direction of the bellows-like portion exhibits an arc shape, Grommet. The grommet according to any one of claims 1 to 3, wherein
In the bellows-shaped part, an inner peripheral side annular groove that is recessed toward the outer peripheral side on the inner peripheral surface of the cylindrical part, and on the outer peripheral surface of the cylindrical part, the inner peripheral side annular groove in the axial direction of the bellows-shaped part A pair of outer circumferential annular grooves that are recessed toward the inner circumferential side of the cylindrical portion at a position sandwiching the inner circumferential side, and the bellows-like shape is bent by the pair of outer circumferential annular grooves and the inner circumferential annular groove. An annular convex portion having a V-shaped cross section in the axial direction of the portion is formed toward the outer peripheral side,
A grommet in which the concave groove is formed in at least one of the pair of outer circumferential annular grooves and the inner circumferential annular groove. A wire harness body,
The grommet according to any one of claims 1 to 4, wherein the grommet is attached to the wire harness body.
Wire harness comprising

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