JP6256254B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet, and more particularly to a grommet that seals an opening of a panel through which a wire group of a wire harness passes.

  Conventionally, when a wire harness is routed over the inside and outside of a vehicle compartment, an opening is formed in the vehicle body panel that partitions the inside and outside of the vehicle compartment, and a cylindrical grommet is attached to the opening edge of the wire harness. Sealing properties and sound insulation properties are secured while protecting the wire group.

  When the opening of the vehicle body panel has a relatively large diameter, a grommet in which a resin inner member that can be locked to the opening edge of the panel is combined with an elastic grommet main body is often used.

  As this type of grommet, for example, a lock rod that protrudes from the substrate portion of the resin inner member toward the grommet main body side is provided, and the locking ball portion on the front end side of the lock rod is used as a fixing recess (guide protrusion portion) of the grommet main body. Is known that can be locked to the inner back side (for example, see Patent Document 1).

  Also, a plurality of fixing claws protruding radially outward from the inner member are provided, and when the grommet main body and the inner member are coupled, the hook-shaped portion at the tip of the fixing claw is passed through the insertion hole formed in the outer peripheral portion of the grommet main body. In addition, there is also known one that is connected to prevent slipping (see, for example, Patent Document 2).

JP-A-7-139664 JP 2011-61930 A

  However, in the former former grommet in which the lock rod protruding from the board of the lock member in the plate thickness direction is locked to the fixing recess of the grommet body, the resin inner member is divided into a plurality of parts. The score will increase. In addition, the operation of incorporating the lock plate with a long lock rod into the lock member integrally having the substrate, the peripheral wall, and the bottom wall must be very difficult. In addition, the locking member with the lock rod protruding in the plate thickness direction is engaged with the grommet main body in the radial direction, and the lock rod protruding from the substrate in the plate thickness direction with the guide protrusion of the grommet main body. It is necessary to simultaneously perform the work of deeply fitting into the fitting hole. For this reason, it has been extremely difficult to connect the grommet body and the resin inner member, resulting in an expensive grommet.

  On the other hand, in the latter latter grommet in which a plurality of fixing claws protrude radially outward from the inner member, it is easy to mold the resin inner member, and the assembly of the grommet main body and the resin inner member is also possible with the inner member. It is only necessary to insert the flange part into the grommet body, and the assembly workability is better than the former grommet. Further, since the fixing claw of the inner member is penetrated in the radial direction with respect to the outer peripheral wall portion of the grommet body, the coupling position of the grommet body and the inner member is defined in the vicinity of the normal position in the circumferential direction. However, due to the elasticity of the grommet body, the grommet body and the resin inner member may be assembled in a laterally shifted state slightly shifted in the circumferential direction from the normal coupling position. In that case, especially when the through-hole of the fixed claw is arranged outside (outside the vehicle) from the seal lip of the grommet body, it opens laterally between the fixed claw of the inner member and the inner wall portion of the through-hole of the grommet body. There has been a concern that the gap and the grommet's waterproofing and sealing properties will deteriorate.

  The present invention has been made to solve such a conventional problem, and it is easy to join the grommet body and the resin inner member, and the grommet body and the resin inner member are properly joined. An object of the present invention is to provide a low-cost grommet that can stably secure the sealing performance between the grommets main body and the concave and convex engaging portions of the inner member even when a laterally shifted state that is shifted from the position in the circumferential direction occurs.

  In order to achieve the above object, the grommet according to the present invention is a grommet in which a cylindrical grommet body having elasticity is combined with a resin inner member so that the inner member penetrates the peripheral wall of the grommet body. At least one protruding portion that protrudes, and the grommet body surrounds the protruding portion without being airtightly fitted to the protruding portion on the proximal end side of the protruding portion, and the distal end side of the protruding portion And has a bulging portion that bulges in the same direction as the protruding portion so as to be airtightly fitted to the protruding portion.

  With this configuration, in the grommet of the present invention, the bulging portion of the grommet body surrounds the protrusion without being airtightly fitted to the protrusion on the proximal end side of the protrusion of the inner member, and the protrusion is on the distal end side of the protrusion. Fits airtightly to the part. Therefore, the operation of inserting the protruding portion of the resin inner member into the bulging portion of the grommet body is relatively easy, and the connection operation of the grommet body and the resin inner member is facilitated. Moreover, even if a laterally shifted state in which the grommet body and the resin inner member are displaced in the circumferential direction from the normal coupling position occurs, the proximal end side of the bulging portion is elastically deformed, while the protruding portion is formed on the distal end side of the bulging portion. And an airtight fitting state can be maintained. Moreover, it is not necessary to divide the resin inner member into a plurality of parts, and the number of parts can be reduced. As a result, it is possible to provide a low-cost grommet capable of stably ensuring the sealing performance of the concave and convex engaging portions of the grommet body and the inner member.

  In the grommet of the present invention, it is preferable that the grommet body surrounds the periphery of the protrusion while being separated from the protrusion on the proximal end side of the protrusion.

  In this case, the operation of inserting the protruding portion of the resin inner member into the bulging portion of the grommet body is further facilitated, and the operation of coupling the grommet body and the resin inner member is facilitated.

  In the grommet of the present invention, the protruding portion of the inner member protrudes in the radial direction of the inner member, and the end portion on the distal end side of the protruding portion is relative to the proximal end portion of the protruding portion. The diameter of the grommet body may be increased, and the bulging portion of the grommet body may bulge in the radial direction of the grommet body.

  With this configuration, in the present invention, when the grommet body is joined to surround a part of the resin inner member in the axial direction, for example, one end portion of the flange shape, the protrusion of the inner member and the bulging portion of the grommet body can be easily formed. It can be made to fit, and the joint strength of both increases. Also, the inner member can be easily formed. Furthermore, since the tip end portion of the bulging portion can be abutted against the end portion of the protruding portion on the tip end side whose diameter is increased, the sealing performance is also improved.

  In the grommet of the present invention, the bulging portion may be formed in a bottomed cylindrical shape with the tip side of the protruding portion as a bottom portion with a fitting hole.

  With this configuration, the operation of inserting the protruding portion of the inner member into the bulging portion of the grommet body is very easy, and the operation of coupling the grommet body and the resin inner member is facilitated. Moreover, even if the grommet main body and the inner member are displaced laterally, the base end side of the bulging part is easily elastically deformed, while the airtight fitting state with the projection part is surely ensured on the tip side of the bulging part. It can be held in.

  According to the present invention, it is easy to join the grommet body and the resin inner member, and the grommet body and the resin inner member are displaced from each other in the circumferential direction from the normal joining position. It is possible to provide a low-cost grommet capable of stably ensuring the sealing performance between the concave and convex engaging portions of the grommet body and the inner member.

1 is an external perspective view of a grommet according to a first embodiment of the present invention. It is a principal part disassembled perspective view of the grommet which concerns on the 1st Embodiment of this invention. It is a principal part perspective sectional view of the grommet concerning a 1st embodiment of the present invention. It is effect | action explanatory drawing shown in the principal part cross section of the grommet which concerns on the 1st Embodiment of this invention. It is a figure which shows the principal part structure of the grommet main body of the grommet which concerns on the 1st Embodiment of this invention, (a) is a front view of the principal part, (b) is a B5 arrow line view of (a), ( c) is a C5-C5 arrow sectional view of (a). It is a figure which shows the principal part structure of the resin-made inner members of the grommet which concerns on the 1st Embodiment of this invention, (a) is a top view of the principal part, (b) is B6 arrow view of (a) FIG. 4C is a view taken in the direction of arrow C6 in FIG. It is explanatory drawing of the mounting state to the opening edge part of the panel of the grommet which concerns on the 1st Embodiment of this invention. It is principal part sectional drawing of the grommet of a comparative example, (a) is principal part plane sectional drawing when the grommet main body and the resin-made inner members are assembled | attached without a lateral shift, (b) is B8-B8 of (a). Sectional drawing, (c) is a principal part sectional plan view when the grommet body and the resin inner member are assembled in a laterally displaced state, and (d) is a sectional view taken along the line D8-D8 in (c). It is effect | action explanatory drawing shown in the principal part cross section of the grommet which concerns on the 2nd Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
The grommet according to the first embodiment shown in FIG. 1 to FIG. 7 is a vehicle body panel in a state of being locked to an inner peripheral edge portion (opening edge portion) of an opening formed in a vehicle body panel that partitions the inside and outside of a passenger compartment of an automobile. It secures the sealing performance and sound insulation at the penetration portion while protecting the wire group W of the wire harness that is fixed to the panel and penetrates the panel.

  First, the structure of the grommet of this embodiment is demonstrated.

  As shown in FIGS. 1 and 7, the grommet 10 of this embodiment includes a resin inner member 12 and a grommet main body 14 formed of an elastic material having rubber elasticity.

  The inner member 12 includes a cylindrical portion 21 having a diameter larger than the wire group W of the wire harness, a panel fixing locking portion 22 provided on one end side in the axial direction of the cylindrical portion 21, and the cylindrical portion 21. And an outer flange portion 23 provided on the other end side in the axial direction.

  The cylindrical portion 21 has a substantially cylindrical shape with a relatively small axial length through which the wire group W of at least one (one bundle), for example, two wire harnesses is inserted. As shown in FIG. 1, the cylindrical portion 21 is formed to have a large diameter so as to be able to cope with a case where the electric wire group W is inclined at a predetermined angle with respect to the central axis direction. Of course, the grommet 10 may be one in which the wire group W of the wire harness penetrates the inner member 12 and the grommet body 14 in the direction of the central axis thereof.

  The locking portion 22 has a plurality of, for example, three arrowhead-shaped hook-shaped locking claws 22a provided at equal circumferential intervals (equal angular intervals) on one axial end side of the cylindrical portion 21. The plurality of locking claws 22a are integrally supported on the upper end side of the cylindrical portion 21 in FIG.

  When the inner member 12 is inserted into the opening 2 of the vehicle body panel 1, the plurality of locking claws 22 a bend so as to reduce the diameter as a whole with the one end 22 b on the arrow tip side as a fulcrum, and pass through the opening 2 of the vehicle body panel 1. Then, when it reaches the back surface 1a side of the vehicle body panel 1, as shown in FIG. 7, it has elasticity to elastically recover so that the diameter of the one end portion 22b on the arrow tip side increases as a whole.

  Further, the plurality of locking claws 22 a have a stepped shape that engages with the opening edge 3 of the vehicle body panel 1 that forms the opening 2 on the back surface 1 a side of the vehicle body panel 1 and the inner peripheral surface side of the opening 2. It has an end 22c. Thereby, the latching | locking part 22 can latch the cylindrical part 21 of the inner member 12 with respect to the vehicle body panel 1 so that extraction prevention is possible.

  The outer flange portion 23 is an annular plate-like body that protrudes radially outward from the lower end side of the tubular portion 21 in FIGS. 1 and 7, and the tubular portion 21 is orthogonal to the tubular portion 21. It is integrally formed.

  The grommet main body 14 is formed from, for example, vulcanized rubber or a resin-based elastomer, and has a substantially circular cover shape that closes the other end side of the tubular portion 21 of the inner member 12. In addition, a through hole 41 having a substantially elliptical cross section through which the wire group W of the two wire harnesses passes is formed at the center of the grommet body 14.

  Specifically, as shown in FIGS. 1 and 5 (a) to 5 (c), the grommet body 14 includes a cylindrical portion 42 having a through hole 41 and a circular cover portion integrally coupled to the cylindrical portion 42. 43 and an outer peripheral cover portion 44 surrounding the outer flange portion 23 of the inner member 12.

  The grommet main body 14 further supports a skirt-like seal lip portion 45 that can be engaged with the vehicle body panel 1 on the locking portion 22 side from the outer flange portion 23 of the inner member 12, and a proximal end side of the seal lip portion 45. An annular plate portion 46 is included. The annular plate portion 46 is in close contact with one surface of the outer flange portion 23 on the locking portion 22 side.

  As shown in FIGS. 2 and 3, the inner member 12 has at least one protrusion that protrudes outward in the radial direction from the outer peripheral surface 23 a of the outer flange portion 23 so as to penetrate the outer peripheral cover portion 44 (peripheral wall) of the grommet body 14. 25. As shown in FIGS. 6A to 6C, the protrusion 25 has a head portion 25a on the tip side and a shaft portion 25b extending from the outer peripheral surface 23a of the outer flange portion 23 to the head portion 25a. doing.

  5 (a) to 5 (c), the outer peripheral cover portion 44 of the grommet main body 14 is the same as the protruding portion 25 with respect to the centers of the grommet 10 and the inner member 12 at a part of the outer periphery thereof. It has a bulging portion 47 that bulges in the direction.

  The bulging portion 47 has a distal end portion 47a that is airtightly fitted to the protruding portion 25 on the distal end side of the protruding portion 25, and is separated from the protruding portion 25 on the proximal end side of the protruding portion 25, that is, the protruding portion 25. The base end side cylinder part 47b which surrounds the circumference | surroundings of the projection part 25, without producing the contact surface pressure of the grade which fits airtightly with respect to is provided.

  Specifically, the bulging portion 47 is formed in a bottomed cylindrical shape with the distal end portion 47 a as a bottom portion, and the proximal end side cylindrical portion 47 b of the bulging portion 47 is an outer peripheral contour of the head portion 25 a of the protruding portion 25. It has an inner peripheral cross-sectional shape that is substantially similar to the shape and that is substantially the same diameter or slightly larger in diameter. In addition, a fitting hole 47c whose free shape is substantially elliptical is formed in the distal end portion 47a of the bulging portion 47.

  As shown in FIG. 2, when the inner member 12 is assembled to the grommet main body 14 and the arrowhead-shaped head portion 25 a of the protruding portion 25 is inserted into the proximal end side tubular portion 47 b of the bulging portion 47, The tip of 25a enters the fitting hole 47c. When the head portion 25a of the protruding portion 25 further enters the fitting hole 47c, the distal end portion 47a of the bulging portion 47 is elastically deformed so as to expand in diameter according to the outer shape of the head portion 25a of the protruding portion 25.

  When the head portion 25a of the protruding portion 25 substantially penetrates the fitting hole 47c, as shown in FIG. 3, the tip portion 47a of the bulging portion 47 exposes the head portion 25a of the protruding portion 25 to the outside. The shaft 25b can be elastically recovered so as to be hermetically pressed and fitted.

  With respect to the free shape shown by a dotted line in FIG. 3, the bulging portion 47 is pushed and expanded to the fitting hole 47c of the distal end portion 47a by the shaft portion 25b, and is also pushed to the proximal end side in the axial direction by the head portion 25a. Appropriate tightening allowance (or contact surface pressure) is set so that a required sealing function is generated at the protruding portion 25 of the bulging portion 47 in an elastically deformed state.

  In other words, the hole diameter of the fitting hole 47c of the bulging portion 47 is set to a small diameter by a required radial allowance relative to the shaft portion 25b of the protruding portion 25, and from the outer peripheral surface 23a of the outer flange portion 23. The protruding height h of the bulging portion 47 outward in the radial direction is set to a value larger than the length t2 of the shaft portion 25b of the protrusion 25 by the required tightening margin in the height direction.

  Here, the proximal-side cylinder portion 47b of the bulging portion 47 is separated from the shaft portion 25b in all radial directions of the shaft portion 25b of the projection portion 25, but according to the shape of the head portion 25a of the projection portion 25. In other words, the outer flange 23 may be separated from the shaft 25b in the circumferential direction.

  The thickness of the distal end portion 47a of the bulging portion 47 in the radial direction of the outer peripheral cover portion 44 is substantially the same as the thickness t4 in the radial direction of the outer peripheral cover portion 44 of the grommet body 14, and the proximal side of the bulging portion 47 The thickness of the cylindrical wall of the cylindrical portion 47b is substantially the same as the thickness t4 in the radial direction of the outer peripheral cover portion 44.

  In this case, the length t2 of the shaft portion 25b (the length in the radial direction from the outer peripheral surface 23a of the outer flange portion 23 to the head portion 25a) in the protruding portion 25 of the inner member 12 and the outer peripheral surface 23a of the outer flange portion 23. The projecting height h of the bulging portion 47 from the radially outward side is set to a value greater than twice the thickness t4 in the radial direction of the outer peripheral cover portion 44, preferably a value greater than three times. Has been.

  As described above, in the present embodiment, the protruding portion 25 of the inner member 12 protrudes in the radial direction of the inner member 12, and the head portion 25 a that is the end portion on the distal end side of the protruding portion 25 is the base of the protruding portion 25. The diameter is increased with respect to the shaft portion 25b which is the end portion. The bulging portion 47 that bulges in the radial direction of the grommet body 14 is fitted into the protruding portion 25 in a tightened state that can exhibit a required sealing performance in the vicinity of the fitting hole 47c that penetrates the protruding portion 25. Match.

  Next, the operation will be described.

  In the grommet 10 of the present embodiment configured as described above, the bulging portion 47 of the grommet body 14 surrounds the protruding portion 25 while being separated from the protruding portion 25 on the proximal end side of the protruding portion 25 of the inner member 12. . Further, on the tip end side of the protrusion 25, the tip 47a of the bulging portion 47 is airtightly fitted to the shaft portion 25b of the protrusion 25 and pressed against the head 25a.

  Therefore, it is easy to insert the protruding portion 25 of the resin inner member 12 into the bulging portion 47 of the grommet main body 14, and the connecting operation between the grommet main body 14 and the resin inner member 12 is facilitated.

  In addition, when the grommet main body 14 and the inner member 12 are assembled, even if a lateral shift state occurs in which both of them are shifted from the normal coupling position in the circumferential direction, the proximal end side tubular portion 47b of the bulging portion 47 is elastically deformed. Thus, on the tip side of the bulging portion 47, the airtight fitting state between the tip portion 47a and the protruding portion 25 can be maintained. Moreover, in this embodiment, it is not necessary to divide the resin inner member 12 into a plurality of pieces as in the prior art, and the number of parts can be reduced.

  As a result, it is possible to provide the low-cost grommet 10 that can stably ensure the sealing performance at the concave-convex engagement portion between the bulging portion 47 of the grommet body 14 and the protrusion 25 of the inner member 12.

  Furthermore, in the present embodiment, the protruding portion 25 of the inner member 12 and the bulging portion 47 of the grommet body 14 protrude in the radial direction of the inner member 12, and the head portion 25 a of the protruding portion 25 is the protruding portion 47. The diameter is increased with respect to the shaft portion 25b on the base end side within a range that can be easily inserted into the base end side cylindrical portion 47b.

  Therefore, in the present embodiment, when the grommet body 14 surrounds the outer flange portion 23 of the inner member 12, the protrusion 25 of the inner member 12 and the bulging portion 47 of the grommet body 14 can be easily fitted. The bond strength between the two is increased. In addition, since the protrusion 25 protrudes in the radial direction, the mold for the inner member 12 can be simplified and the molding becomes easy. Furthermore, since the head portion 25a of the protruding portion 25 and the tip end portion 47a of the bulging portion 47 can be brought into axial contact with each other in the axial direction, the sealing performance is also improved.

  In addition, in the present embodiment, the bulging portion 47 is formed in a bottomed cylindrical shape with the distal end side of the protruding portion 25 as a bottom portion with a fitting hole 47c, and therefore, in the bulging portion 47 of the grommet main body 14 The operation of inserting the protrusion 25 of the inner member 12 into the inner member 12 becomes very easy, and the operation of coupling the grommet body 14 and the inner member 12 becomes easier.

  Moreover, even if the grommet main body 14 and the inner member 12 are laterally displaced, as shown in FIG. 4, the base end side tubular portion 47b of the bulging portion 47 is in the normal position (state shown in the upper side in the figure). ) To the elastically deformed state shown in the lower part of the figure, the airtight fitting state between the bulging portion 47 and the protruding portion 25 is ensured on the tip portion 47a side of the bulging portion 47. It can be held.

  As described above, in this embodiment, the grommet main body 14 and the resin inner member 12 are easily joined, and the grommet main body 14 and the resin inner member 12 are displaced in the circumferential direction from the normal coupling position. Even if a laterally shifted state occurs, it is possible to provide a low-cost grommet that can stably ensure the sealing performance of the concave and convex engaging portions of the grommet main body 14 and the inner member 12.

(Comparative example)
In order to clarify the effect of the present invention, a comparative example is shown in FIG.

  The grommet 100 of this comparative example is similar in overall shape to the inner member 12 and the grommet main body 14 of the first embodiment described above, but is different from the protruding portion 25 and the bulging portion 47 in the first embodiment. The inner member 112 and the grommet main body 114 have a concave and convex engaging portion shape. Other configurations are the same as or similar to those of the first embodiment. Therefore, the same or similar parts will be described using the reference numerals of the corresponding components in the first embodiment.

  As shown in FIG. 8A, the inner member 112 is assembled to the grommet main body 114, and the arrow-shaped head portion 125 a of the projection 125 that discharges from the outer flange portion 23 of the inner member 112 is the outer periphery of the grommet main body 114. It is inserted into a thick cylindrical portion 147 formed in a part of the cover portion 44.

  The thick cylindrical portion 147 has an inner peripheral portion that is expanded by the shaft portion 125b of the projection 125 with respect to the free shape indicated by the dotted line in FIGS. 8A and 8B. Appropriate allowances are set so that a required sealing function is generated in the through portion of the protruding portion 125 at 147.

  Here, the thickness ta of the thick cylindrical portion 147 in the radial direction of the outer peripheral cover portion 44 is a value slightly larger than the thickness t4 in the radial direction of the outer peripheral cover portion 44 of the grommet body 14, for example, a value less than twice. is there. In addition, the wall thickness tr in the left-right direction in FIG. 8A of the thick cylindrical portion 147 in the fitted state with the protrusion 125 is larger than the radial thickness t4 of the outer peripheral cover portion 44. In the free shape, the wall thickness is set to be equal to or greater than the thickness ta of the thick-walled cylindrical portion 147.

  In this case, as shown in FIGS. 8C and 8D, when the inner member 112 is assembled in a state where the inner member 112 is laterally displaced relative to the grommet main body 114 in the circumferential direction, the thick tube portion A gap g opened on one side in the circumferential direction is formed between 147 and the shaft 125b of the protrusion 125. Therefore, when the penetration part of the projection part 25 is arrange | positioned from the seal lip part 45 of the grommet main body 114 on the outer side (outside of the vehicle), there is a concern about deterioration of waterproofness and sealing performance of the grommet 100. Such a problem is solved in the first embodiment described above.

(Second Embodiment)
FIG. 9 shows a grommet according to the second embodiment of the present invention.

  The second embodiment differs from the first embodiment described above in the shape of the bulging portion of the grommet body, but is otherwise the same as or similar to the first embodiment. . Therefore, for the same or similar configuration as the first embodiment, the difference from the first embodiment will be described using the reference numerals of the corresponding components in the first embodiment.

  As shown in FIG. 9, in the second embodiment, the inner diameter of the base end side cylindrical portion 47 b of the bulging portion 47 of the grommet body 14 is larger than the outer diameter of the head portion 25 a of the protruding portion 25. Although it is close to the diameter of the shaft portion 25b, it is set to an inner diameter that does not cause tightening to exhibit a sealing function.

  On the other hand, the distal end portion 47a of the bulging portion 47 is set with a predetermined tightening margin on the outer side in the radial direction from the outer peripheral cover portion 44 as in the case of the first embodiment, so as to exhibit a sealing function. The projection 25 is fitted to the shaft portion 25b. The distal end portion 47a of the bulging portion 47 and the head portion 25a of the protruding portion 25 are in contact with each other with a predetermined contact surface pressure or are close to each other in a non-contact state.

  In this case, the tube wall thickness of the base end side tube portion 47b of the bulging portion 47 is equal to or less than the radial thickness t4 of the outer peripheral cover portion 44 of the grommet body 14. An annular groove extending in the circumferential direction may be formed in the base end side cylindrical portion 47b of the bulging portion 47 so that the base end side cylindrical portion 47b is partially thinned.

  In this embodiment, the same effect as that of the first embodiment can be obtained. In addition, in the present embodiment, since the bulging portion 47 can be reduced in diameter, the grommet mounting property is improved.

  In each of the above-described embodiments, the protrusion 25 has a substantially elliptical cross-sectional shape, but may have a cylindrical or non-circular cross-section other than an elliptical shape. Needless to say. In addition, the base end side cylindrical portion 47b of the bulging portion 47 is not pressed against the shaft portion 25b of the protruding portion 25. However, the tightening margin and the tightening force of the distal end portion 47a are set against the shaft portion 25b of the protruding portion 25. If the base end side tubular portion 47b is set to a value sufficiently larger than the tightening allowance or tightening force (for example, a value of 3 times or more), the base end side tubular portion 47b of the bulging portion 47 is a protrusion. The 25 shaft portions 25b may be pressed lightly.

  Further, in each of the above-described embodiments, the protruding portion 25 and the bulging portion 47 protrude in the radial direction of the grommet 10 and the inner member 12, but these protrude in the plate thickness direction of the outer flange portion of the inner member. Or tilting or curving. Of course, a plurality of protrusions 25 that are separated in the circumferential direction of the outer flange portion 23 may be provided.

  As described above, according to the present invention, the grommet main body and the resin inner member can be easily combined, and the grommet main body and the resin inner member are in a laterally shifted state in which the grommet main body and the resin inner member are displaced in the circumferential direction from the normal coupling position. Even if it occurs, it is possible to provide a low-cost grommet that can stably ensure the sealing performance of the concave and convex engaging portions of the grommet body and the inner member. The present invention is useful for all grommets that seal the opening of the panel through which the wire group of the wire harness passes.

DESCRIPTION OF SYMBOLS 1 Body panel 3 Opening edge part 10 Grommet 12 Inner member 14 Grommet main body 21 Cylindrical part 22 Locking part 22a Locking claw 23 Outer flange part 25 Projection part 25a Head part 25b Shaft part 44 Outer peripheral cover part (peripheral wall)
45 Seal lip part 46 Annular plate part 47 Bumping part 47a Tip part 47b Base end side cylinder part 47c Fitting hole h Projection height (projection height of the bulging part outward in the radial direction)
t2 length (length of shaft part of protrusion)
t4 Thickness (radial thickness of the outer cover of the grommet body)
W Wire harness wire group

Claims (4)

A grommet in which a cylindrical grommet body having elasticity is combined with a resin inner member,
The inner member has at least one protrusion that protrudes through the peripheral wall of the grommet body;
The grommet body surrounds the periphery of the protrusion without being airtightly fitted to the protrusion on the base end side of the protrusion, and is airtightly fitted to the protrusion on the distal end side of the protrusion. A grommet having a bulging portion that bulges in the same direction as the protruding portion.   2. The grommet according to claim 1, wherein the grommet main body surrounds the periphery of the protrusion while being separated from the protrusion on the proximal end side of the protrusion. The protruding portion of the inner member protrudes in the radial direction of the inner member, and the end portion on the distal end side of the protruding portion is expanded in diameter relative to the proximal end portion of the protruding portion,
The grommet according to claim 1 or 2, wherein the bulging portion of the grommet body bulges in a radial direction of the grommet body.   The said bulging part is formed in the bottomed cylinder shape which makes the said front end side of the said projection part the bottom part with a fitting hole, The Claim 1 thru | or 3 characterized by the above-mentioned. Grommet.

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