JP2014212585A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet having excellent waterproofness in which sealability of a sub-seal part can be ensured even if an insertion part of a wire harness inclines.SOLUTION: A grommet 1 includes a cylindrical portion 2 having a through hole 2a penetrating in the axial direction AX, a first annular seal part 3 located on the outer peripheral side of the cylindrical portion 2 and fitted in the inner peripheral part of a fixing hole H opening to a panel member P, a flange part 4 increasing in diameter from the vicinity of the first annular seal part 3 to the radial outside so as to face to one side P1 of the panel member P, and a second annular seal part 5 projecting from the flange part 4 and abutting against the one side P1 of the panel member P so as to surround the fixing hole H. The second annular seal part 5 has a cross-sectional shape mutually bending in a plurality of different directions for the axial direction AX.

Description

  The present invention relates to a grommet, and more specifically, when mounted on a mounting hole that opens in a panel member such as a vehicle body panel, the wiring harness inserted through the mounting hole is insulated and protected and the mounting hole is sealed watertight. It relates to a grommet that ensures waterproofness.

  Generally, a plurality of openings through which wiring and piping are inserted are formed in a vehicle body panel that divides the inside and outside of the vehicle body, and the attachment holes that are opened in the vehicle body panel for inserting a wire harness or the like are provided in the attachment holes. A grommet is attached that insulates and protects the inserted wire harness and the like and seals the mounting holes in a watertight manner to ensure waterproofness.

  As a conventional grommet of this type, the first concave fitting that forms a concave shape wider than the plate thickness of the vehicle body panel is attached to the seal portion of the grommet fitted to the inner peripheral edge of the mounting hole that opens in the vehicle body panel as a panel member. And a rib that protrudes in the extending direction of the grommet so as to abut on the vehicle body panel on the flange portion on the vehicle outer side from both the fitting portions. What was provided is known (for example, refer patent document 1). The flange rib can function as a sub-seal portion that contacts the vehicle body panel around the mounting hole.

Japanese Patent Laid-Open No. 2001-266685

  However, in the conventional grommet described above, a strong tensile force or the like acts from the wire harness to the end of the grommet during the wiring harness routing operation, and the tubular portion of the grommet through which the wire harness is inserted is the vehicle body panel. There was a case where it would tilt. In this case, not only the tubular portion of the grommet is inclined with respect to the vehicle body panel, but also the flange formed integrally with the grommet is inclined with respect to the vehicle body panel. Therefore, at the time of the wiring work of the wire harness, the contact state with respect to the vehicle body panel for the flange-shaped annular rib to function as the sub seal portion is impaired, and the waterproof function of the grommet using the sub seal portion is deteriorated. was there.

  The present invention has been made to solve the above-described problems, and provides a grommet having excellent waterproofness that can stably secure the sealing performance of the sub-seal portion even when the insertion portion of the wire harness is inclined. The purpose is to do.

  In order to achieve the above object, the grommet according to the present invention has a cylindrical body portion having a through-hole penetrating along the axial direction, and an inner periphery of a mounting hole that is located on the outer peripheral side of the cylindrical body portion and opens to the panel member. A first annular seal part fitted into the part, a flange part expanding radially outward from the vicinity of the first annular seal part to face one side of the panel member, and protruding from the flange part A grommet including a second annular seal portion that abuts on the one surface side of the panel member so as to surround the mounting hole, wherein the second annular seal portion is in a plurality of directions different from each other with respect to the axial direction. It has a bent cross-sectional shape.

  With this configuration, the grommet according to the present invention is configured such that, when the cylindrical body portion is tilted together with the wire harness inserted through the through hole at the time of assembly in a state of being fitted to the panel member, Since the second annular seal portion on the side inclined in the separating direction partially extends, and the second annular seal portion on the side inclined in the direction in which the cylindrical body portion approaches on one surface side of the panel member is partially compressed, There is no gap between the panel member and the second annular seal portion, and sealing performance can be ensured.

  In the grommet configured as described above, the second annular seal portion may be a grommet that is at least partially formed into a bellows shape that is folded from one side to the other side in the radial direction of the cylindrical body portion.

  With this configuration, the grommet according to the present invention can easily have flexibility in the second annular seal portion.

  In addition, the grommet having the above-described configuration protrudes from the flange portion on the inner side in the radial direction with respect to the second annular seal portion, and contacts the one surface side of the panel member so as to surround the mounting hole. It is good also as a grommet further provided with the seal part.

  With this configuration, the grommet according to the present invention allows the third annular seal portion to be in contact with the panel member even when the second annular seal portion floats from one surface side of the panel member and a gap is formed between the panel member. Can be sealed.

  ADVANTAGE OF THE INVENTION According to this invention, the grommet excellent in the waterproof property which can ensure the sealing performance of a sub seal | sticker part stably even if inclination arises in the insertion part of a wire harness can be provided.

It is a front view which shows the grommet which concerns on the 1st Embodiment of this invention. It is sectional drawing of the AA line of FIG. 1 which shows the grommet which concerns on the 1st Embodiment of this invention. The grommet which concerns on the 1st Embodiment of this invention is shown, (A) is the fragmentary sectional view which expanded the range B of FIG. 2, (B) is the fragmentary sectional view which expanded the range C of FIG. It is sectional drawing which shows the state which fitted the grommet which concerns on the 1st Embodiment of this invention to the panel member. It is sectional drawing for demonstrating the effect | action of the grommet which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the grommet which concerns on the 2nd Embodiment of this invention. It is sectional drawing for demonstrating the effect | action of the grommet which concerns on the 2nd Embodiment of this invention. It is a fragmentary sectional view of the position corresponding to Drawing 3 showing the grommet concerning a 3rd embodiment of the present invention. It is a fragmentary sectional view of the position corresponding to Drawing 3 showing the grommet concerning a 3rd embodiment of the present invention. It is a fragmentary sectional view of the position corresponding to Drawing 3 showing the grommet concerning a 3rd embodiment of the present invention. It is a fragmentary sectional view of the position corresponding to Drawing 3 showing the grommet concerning a 3rd embodiment of the present invention.

  Next, an embodiment according to the present invention will be described with reference to the drawings.

(First embodiment)
First, the structure of the grommet will be described. The grommet shown as this Embodiment is applied to the wire harness for vehicles. 1 to 5 are diagrams showing a grommet according to the present embodiment.

  As shown in FIG. 1 to FIG. 5, the grommet 1 is provided with a cylindrical body portion 2 having a through hole 2 a penetrating along the axial direction AX, and a panel member P mounted on the outer peripheral side of the cylindrical body portion 2. From the vicinity of the first annular seal portion 3 fitted into the inner peripheral portion of the hole H and the fitting portion of the first annular seal portion 3 to the panel member P so as to face the one surface side P1 of the panel member P, radially outward. The flange part 4 which expands in diameter, and the 2nd annular seal part 5 which contact | abuts to the one surface side P1 of the panel member P so that it may protrude from the flange part 4 and may surround the attachment hole H are provided. Further, the grommet 1 includes a protruding portion 6 that protrudes radially outward from the outer periphery of the cylindrical body portion 2 and faces the flange portion 4. In the grommet 1, these parts 2 to 6 are formed of an elastic body such as synthetic rubber or elastomer by integral molding, and the wire harness W is supported by the cylindrical body 2.

  The panel member P is, for example, a vehicle body panel or the like, and has a mounting hole H for inserting the wire harness W through the grommet 1. The attachment hole H is a circular through-hole provided in the panel member P, and the grommet 1 is attached thereto.

  The cylindrical portion 2 has a cylindrical shape, and has a through hole 2a penetrating along the axial direction AX inside. The protruding portion 6, the first annular seal portion 3, the flange portion 4 and the second portion are sequentially formed from the outside. The annular seal portion 5 is continuously provided by integral molding.

  The first annular seal portion 3 is supported on the outer peripheral side of the cylindrical body portion 2 via the protruding portion 6 and is fitted into the inner peripheral portion of the mounting hole H of the panel member P. Further, the first annular seal portion 3 has an outer diameter larger than the diameter of the mounting hole H. Therefore, when the first annular seal portion 3 is fitted into the inner peripheral portion of the attachment hole H, the first annular seal portion 3 can be recessed by elastic deformation to seal the attachment hole H.

  The flange portion 4 is configured to expand from the end of the first annular seal portion 3 toward the outer side in the radial direction so as to face the one surface side P1 of the panel member P on the outer peripheral side of the cylindrical body portion 2. .

  The second annular seal portion 5 is provided to protrude in the axial direction AX on the flange portion 4 so as to contact the panel member P around the mounting hole H, and has a cross-sectional shape bent in a plurality of directions different from each other with respect to the axial direction AX. Have. Specifically, the second annular seal portion 5 is flexible at least in a part of a bellows shape that is folded from one side in the radial direction of the cylindrical body portion 2 to the other side. Thereby, the 2nd annular seal part 5 functions as a sub seal part contacted to one side P1 of panel part P.

  The projecting portion 6 is positioned on the one surface side P1 of the panel portion P after projecting from the end of the cylindrical portion 2 positioned on the other surface side P2 of the panel portion P toward the outside in the radial direction in the cross-sectional shape. It extends toward the end of the cylindrical body 2 and toward the inside in the radial direction. Thereby, the overhang | projection part 6 has the thickness which follows the axial direction AX, and swells so that the approximate center part along the axial direction AX may become the maximum diameter. Thereby, the overhang | projection part 6 comprises the hollow space 6a for sound insulation between the cylinder parts 2. FIG. In addition, the part connected to the cylinder part 2 of the overhang | projection part 6 is thicker than another part in order to maintain an intensity | strength.

  Furthermore, the peripheral edge part of the one surface side P1 of the panel part P of the overhang | projection part 6 is separated from the cylinder part 2, and has the play space part 6b. Thereby, the overhang | projection part 6 is the state which attached the grommet 1 to the panel member P, ie, the state which inserted the 1st cyclic | annular seal | sticker part 3 in the inner peripheral part of the attachment hole H, and is the panel part P. The other side P2 is supported in a cantilever state.

  Therefore, the overhanging portion 6 is configured to connect the cylindrical portion 2 to the flange portion 4 and the second portion with respect to a load from the wire harness W in a state in which the wire harness W is inserted into the through hole 2a and supported by the cylindrical portion 2. It can be displaced independently of the annular seal portion 5.

  Next, with reference to FIG. 4 and FIG. 5, the effect | action in the grommet 1 which concerns on this Embodiment is demonstrated.

  As shown in FIG. 4, in the grommet 1, the first annular seal portion 3 is fitted into the inner peripheral portion of the attachment hole H in the state where the grommet 1 is mounted in the attachment hole H of the panel member P, and the second annular seal portion 5 is The panel member P is compressed so as to abut against the one surface side P1 and to be crushed along the axial direction AX. As a result, the first annular seal portion 3 and the second annular seal portion 5 can perform double sealing.

  Further, as shown in FIG. 5, when the wire harness W is inserted into the cylindrical body portion 2 so as to be inserted through the attachment hole H, or when the wire harness W is routed or routed, the cylindrical body portion 2 is connected together with the wire harness W. May tilt.

  Here, as described above, the cylindrical portion 2 is supported in a cantilevered state by the overhanging portion 6, and therefore the flange portion 4 and the second portion 2 are formed in a state where the inclination of the wire harness W and the cylindrical portion 2 is small. The cylindrical part 2 is inclined independently of the flange part 4 and the second annular seal part 5 by elastic deformation of the expansion part 6 without acting on the annular seal part 5.

  On the other hand, when the inclination of the wire harness W and the cylindrical body part 2 is large and cannot be absorbed by the elastic deformation of the inflating part 6, the flange part 4 is also inclined next. However, in the present embodiment, since the second annular seal portion 5 has a bellows shape and is flexible, for example, the cylindrical member portion 2 is inclined in a direction in which it is separated on the one surface side P1 of the panel member P. The second annular seal 5 on the side extends partially. In addition, the second annular seal portion 5 on the side inclined in the direction in which the cylindrical body portion 2 approaches on the one surface side P1 of the panel member P is partially compressed. Thereby, a clearance gap is not made between the panel member P and the 2nd annular seal part 5, and a sealing performance is securable. The phrase “second annular seal portion 5 partially extends” means that the second annular seal portion 5 is released from the compressed state, that is, returns to its state by elasticity, and does not mean that the second annular seal portion 5 expands and contracts compositionally.

  As described above, the grommet 1 according to the present embodiment has the second annular seal portion even when the cylindrical body portion 2 is tilted together with the wire harness W inserted through the cylindrical body portion 2 while being attached to the panel member P. 5 has flexibility and can partially exhibit an expansion / contraction action according to the inclination direction of the cylindrical body portion 2 to ensure the sealing performance between the panel member P and the second annular seal portion 5. The mounting hole H can be sealed in a watertight manner to ensure waterproofness.

  Note that, as described above, the first annular seal portion 3 has an outer diameter larger than the diameter of the mounting hole H in order to secure the state where the mounting hole H is sealed. At this time, the first annular seal portion 3 is long along the axial direction AX so that no gap is generated with respect to the inner peripheral portion of the mounting hole H even when the cylindrical portion 2 described above is inclined with respect to the panel member P. It is made into the cylinder shape which has thickness.

  At the same time, the first annular seal portion 3 is intended to further secure the state where the mounting hole H is sealed, and a part of the overhang portion 6 is functionally used as the first annular seal portion 3. Yes.

  That is, the inclined portion of the overhanging portion 6 located in the vicinity of the boundary with the first annular seal portion 3 is in a state in which the cylindrical portion 2 is not inclined as shown in FIG. 4, or as shown in FIG. 2 and the flange portion 4 are both in contact with the other surface side P2 of the panel member P.

  As a result, as shown in FIG. 3 (B), a gap is generated between the inner peripheral portion of the mounting hole H by bringing the inclined portion of the overhanging portion 6 into contact with the other surface side P2 of the panel member P. It can be used as the inclined seal portion 3a of the first annular seal portion 3 for ensuring the function of making it difficult to cause.

(Second Embodiment)
6 and 7 show a grommet according to the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different components are mainly described. explain. A grommet 1A according to the present embodiment is similar to the first embodiment in that a cylindrical body portion 2 having a through hole 2a, a first annular seal portion 3, a flange portion 4, and a second annular seal portion 5 are provided. And an overhang portion 6.

  Further, the grommet 1A according to the second embodiment is formed on the one surface side P1 of the panel member P so as to protrude from the flange portion 4 on the inner side in the radial direction with respect to the second annular seal portion 5 and to surround the mounting hole H. A third annular seal portion 7 is further provided.

  The third annular seal portion 7 is formed such that the protruding height L1 from the flange portion 4 is higher than the protruding height L2 of the second annular seal portion 5 from the flange portion 4. Therefore, when the first annular seal portion 3 is fitted into the inner peripheral portion of the mounting hole H of the panel member P, the bending of the third annular seal portion 7 that contacts the one surface side P1 of the panel member P is caused by the deformation of the panel member P. It becomes smaller than the bending of the 2nd annular seal part 5 contact | abutted to the one surface side P1.

  According to the second embodiment, as shown in FIG. 7, in the grommet 1, the tubular body portion 2 is inclined together with the wire harness W, and a part of the second annular seal portion 5 is made depending on the magnitude and direction of the inclination. Even when the gap is generated by floating from the one surface side P1 of the panel member P, the third annular seal portion 7 is kept in contact with the one surface side P1 of the panel member P. The space between the panel member P and the one surface P1 can be sealed.

(Third embodiment)
8 to 11 show a grommet according to the third embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different components are mainly described. explain. In the above embodiment, the second annular seal portion 5 is flexible by forming a bellows shape as a whole in a meandering state in which the cross-sectional shape of the second annular seal portion 5 is alternately bent inward and outward in the radial direction. .

  That is, as shown in FIG. 8, the second annular seal portion 8 is flexible by forming a bellows shape as a whole in a meandering state bent in the opposite direction along the axial direction toward the outside in the radial direction. You may comprise as follows.

  Further, as shown in FIG. 9, a second annular shape having flexibility by forming a bellows shape as a whole by a meandering portion alternately bent inward and outward in the radial direction and a linear portion along the axial direction AX. You may comprise like the seal part 9. FIG. At this time, as shown in FIG. 10, the number of times of bending may be configured as in the second annular seal portion 10 that is set to be twice or more.

  Further, as shown in FIG. 9, a second annular shape having flexibility by forming a bellows shape as a whole by a meandering portion alternately bent inward and outward in the radial direction and a linear portion along the axial direction AX. You may comprise like the seal part 9. FIG. At this time, as shown in FIG. 10, the number of times of bending may be configured as in the second annular seal portion 10 that is set to be twice or more. Similarly, as shown in FIG. 11, the amplitude width bent in the radial direction may be configured like a second annular seal portion 11 that is reduced in the middle portion.

  In the above embodiment, each of the second annular seal portions 5, 8, 9, 10, and 11 is folded back from one side in the radial direction of the cylindrical body portion 2 to the other side in at least a part of the axial direction AX. Although it has a bellows shape and has the same cross-sectional shape on the entire periphery, it does not necessarily have to have the same cross-sectional shape on the entire periphery. That is, the bellows-like cross-sectional shape may be partially different according to the wiring direction of the wire harness and the opening shape of the attachment hole H.

  By the way, although the said embodiment demonstrated the case where the grommet 1 was applied to the wire harness for vehicles, it is not limited to this. For example, the grommet according to the present invention has an effect that it can be a grommet excellent in waterproofness that can stably secure the sealing performance of the sub seal portion even if the insertion portion of the wire harness is inclined, and the panel When mounted in a mounting hole that opens in a member, the grommet is useful for all grommets that insulate and protect the wire harness inserted through the mounting hole and seal the mounting hole in a watertight manner to ensure waterproofness.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Cylindrical part 2a Through-hole 3 1st annular seal part 4 Flange part 5 2nd annular seal part (sub seal part)
7 Third annular seal P Panel member H Mounting hole AX Axial direction

Claims (3)

A cylindrical body portion having a through-hole penetrating along the axial direction;
A first annular seal portion that is fitted on an inner peripheral portion of an attachment hole that is located on the outer peripheral side of the cylindrical body portion and opens in the panel member;
A flange portion that expands radially outward from the vicinity of the first annular seal portion so as to face one side of the panel member;
A second annular seal portion that contacts the one surface side of the panel member so as to protrude from the flange portion and surround the mounting hole;
A grommet with
The grommet wherein the second annular seal portion has a cross-sectional shape bent in a plurality of directions different from each other with respect to the axial direction.   2. The grommet according to claim 1, wherein at least a part of the second annular seal portion has a bellows shape folded from one side in the radial direction of the cylindrical body portion to the other side.   A third annular seal portion that abuts against the one surface side of the panel member so as to protrude from the flange portion on the inner side in the radial direction with respect to the second annular seal portion and surround the mounting hole; The grommet according to claim 1 or 2, characterized by the above.

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