JP6131905B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet, and more particularly to a grommet for protecting a wire group of a wire harness that penetrates a panel.

  Conventionally, when wiring harnesses are routed inside and outside the car compartment of an automobile, an opening for passing the wire harness is formed in the body panel that partitions the inside and outside of the compartment, and a cylindrical grommet is attached to the edge of the opening. And sealing property and sound-insulating property are ensured, protecting the electric wire group of a wire harness.

  Further, when the opening of the vehicle body panel has a relatively large diameter, it is required to sufficiently increase the holding force for holding the grommet in a fixed state with respect to the external force acting on the grommet from the wire harness or the vehicle body panel. In such a case, the grommet which combined the resin-made inner member with the grommet main body which has elasticity is used abundantly.

  This type of conventional grommet has, for example, a locking claw portion that is locked to the opening edge of the panel on one end side of the cylindrical portion of the inner member, and projects radially outward on the other end side of the cylindrical portion. An outer flange portion (see, for example, Patent Document 1). In this grommet, when the inner member is attached to the grommet main body, the outer flange portion enters the annular groove of the grommet main body, so that the holding force of the grommet main body against the inner member is enhanced.

  In addition, a locking claw portion that is locked to the opening edge of the panel is provided on one end side of the cylindrical inner member, and the other end side of the inner member is spaced apart from the annular flange portion by a predetermined angle. There is one provided with a plurality of fixed claws protruding outward in the radial direction (see, for example, Patent Document 2). In this grommet, when the inner member is attached to the grommet main body, the fixing claw is inserted into the outer peripheral hole of the grommet main body, and is prevented from coming off by the hook-shaped claw portion at the tip of the fixing claw.

JP2012-130085A JP 2011-61930 A

  However, in the conventional grommet in which the outer flange portion is directed to the other end side of the inner member, the penetration posture of the wire group of the wire harness with respect to the vehicle body panel and the grommet changes due to vibration or the like, or the penetration posture of the wire group during the wiring work Sometimes changed. In such a case, the holding force for the grommet panel is not sufficient.

  That is, while the resin inner member can be firmly locked to the vehicle body panel, the holding force of the elastic grommet body to the resin inner member is not sufficient. Therefore, for example, if a force that changes the inclination of the wire group with respect to the vehicle body panel and the grommet is applied to the wire group during the routing work, the grommet body is separated from the inner member in part of the circumferential direction of the grommet. A large force is easily generated. In that case, the holding force with respect to the inner member of the grommet body was not sufficient.

  In addition, with conventional grommets where the fixing claws are engaged with the outer periphery of the grommet body, when the inner member and the grommet body are joined, not only are the multiple fixing claws of the inner member fitted into the grommet body, but also fixed. It has been necessary to prevent the hook-like claw at the tip of the claw by protruding outward from the outer peripheral hole of the grommet body. Therefore, there is a problem that workability for assembling the inner member to the grommet body is poor. In addition, if a large tensile force acts on the wire group of the wire harness, the grommet body is held by a plurality of fixing portions, and the holding power of the grommet body to the inner member is lower than when the outer flange is provided. There was a problem that.

  The present invention has been made to solve the above-described problems, and can reliably increase the holding force of the grommet body with respect to the inner member, and has excellent workability when assembling these two parts. The purpose is to provide grommets.

  In order to achieve the above object, the protector according to the present invention has a cylindrical portion through which the wire group of the wire harness is inserted, and a locking portion locked to the opening edge of the panel on one end side of the cylindrical portion, and A resin inner member having an outer flange portion projecting radially from the other end side of the cylindrical portion and a cover that closes the other end side of the cylindrical portion and penetrates through the wire group A grommet including an elastic grommet body having a hole formed therein, the grommet body having a seal lip portion engageable with the panel on the locking portion side from the outer flange portion, and the seal lip portion And an annular plate portion adjacent to one surface of the outer flange portion on the side of the locking portion, and at least a part of the outer flange portion in the circumferential direction at the front of the grommet body. One side of the locking portion in contact with the annular plate portion has a tapered surface inclined to be close to the locking portion as the outer peripheral side in the axial direction.

  With this configuration, between the opening edge of the panel and the outer flange portion of the inner member, at least a part of the annular plate portion of the grommet main body in the circumferential direction has a seal lip on one side of the outer flange portion of the inner member. While being in contact with the outer flange portion with a pressure of about the contact pressure, the concave and convex engagement state is entered in the axial direction with respect to the outer flange portion of the inner member. Further, the outer flange portion bites into the grommet body in the axial direction at the outer peripheral end of the tapered surface. Therefore, even if a large force that separates the inner member and the grommet main body is generated, the annular plate portion of the grommet main body located on one side of the flange portion of the inner member is restrained from moving in the radial direction with respect to the inner member. As a result, the coupling state of the inner member and the grommet body is reliably maintained, and the holding force of the grommet body with respect to the inner member can be reliably increased.

  In the grommet of the present invention, the outer flange portion of the inner member may have an uneven portion that engages with the annular plate portion of the grommet body on the tapered surface.

  With this configuration, the outer flange portion of the inner member and the annular plate portion of the grommet main body are not only engaged with the concave and convex portions at the tapered surface portion, but also are deeply engaged with the concave and convex portions on the tapered surface. Therefore, the coupling between the inner member and the grommet body is strengthened, and the holding force of the grommet body with respect to the inner member can be more reliably increased.

  According to the present invention, the detachment force between the grommet body and the inner member can be sufficiently increased, and a grommet excellent in assembling workability of these two parts can be provided.

It is a figure which shows the inner member in the grommet which concerns on one embodiment of this invention, (a) is the bottom view seen from the insertion end side of the inner member, (b) is seen from the insertion end side of the inner member It is an external perspective view. It is a figure which shows the grommet main body in the grommet which concerns on one embodiment of this invention, (a) is the perspective view seen from the seal lip part side of the grommet main body, (b) is a figure from the seal lip part side of the grommet main body. It is the perspective sectional view seen at an angle different from 2 (a). It is a perspective sectional view of the grommet which shows the state where the inner member and grommet main part in the grommet concerning one embodiment of the present invention were combined. It is the side view of the grommet which shows the state which let the electric wire group of the wire harness pass through the grommet which concerns on one embodiment of this invention. It is a principal part expanded sectional view of the grommet which shows the coupling | bond part of the inner member and grommet main body in the grommet which concerns on one embodiment of this invention. It is a principal part expanded sectional view of the grommet which shows the coupling | bond part of the inner member and grommet main body in the grommet which concerns on other embodiment of this invention.

  Embodiments for carrying out the present invention will be described below with reference to the drawings.

(One embodiment)
The grommet according to the embodiment shown in FIGS. 1 to 5 is fixed to the vehicle body panel in a state of being locked to an inner peripheral edge (opening edge) of an opening formed in the vehicle body panel that partitions the inside and outside of the passenger compartment of the automobile. Thus, while protecting the wire group of the wire harness that penetrates the panel, the sealing property and the sound insulation property at the penetration portion are ensured.

  First, the configuration of the present embodiment will be described.

  As shown in FIGS. 1 to 4, the grommet 10 of the present embodiment includes a resin inner member 12 and a grommet body 14 having rubber elasticity.

  As shown in FIGS. 1A and 1B, the inner member 12 includes a cylindrical portion 21, a locking portion 22 provided on one end side in the axial direction of the cylindrical portion 21, and a cylindrical shape. And an outer flange portion 23 provided on the other end side in the axial direction of the portion 21.

  The cylindrical portion 21 has a substantially cylindrical shape with a relatively small axial length through which the wire group W (see FIG. 4) of the wire harness is inserted. For example, as shown in the drawings, the cylindrical portion 21 has a case where the wire group W penetrates the grommet main body 14 in the central axis direction and an inclined posture inclined by a predetermined angle from the penetrating posture in FIG. It can be adapted to both cases.

  The locking portion 22 has a plurality of, for example, four arrow-shaped hook-shaped locking claws 22 a provided at equal circumferential intervals (equal angular intervals) on one end side in the axial direction of the cylindrical portion 21. The plurality of locking claws 22a are integrally supported on the upper end portion of the cylindrical portion 21 in FIGS. 1 (a) and 4 at one end portion on each arrow tip side.

  When inserted into the opening 2 of the vehicle body panel 1, the plurality of locking claws 22 a bend so that the diameter is reduced as a whole with the one end 22 b on the arrowhead side as a fulcrum, and passes through the opening 2 to show the vehicle body as shown in FIG. 4. When it reaches the back surface 1a side of the panel 1, it has elasticity that elastically recovers so that the diameter of the one end 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 in FIG. 1B of the tubular portion 21, and is formed with the tubular portion 21 so as to be orthogonal to the tubular portion 21. It is integrally formed.

  As shown in FIGS. 3 and 5, the outer flange portion 23 is at least partly in the circumferential direction of the outer flange portion 23, for example, the entire circumference, and the one surface 23 a on the locking portion 22 side is more axial in the outer circumferential side. The tapered surface is inclined so as to be close to the locking portion 22 (having a tapered surface in substantially the entire region).

  The term “at least a part in the circumferential direction” as used herein refers to the vicinity of a portion where the force in the direction in which the grommet main body 14 is detached from the inner member 12 is the largest during the wiring operation or in the use state among the respective portions in the circumferential direction. It is. For example, when the electric wire group W is inclined from the orthogonal posture with respect to the plate surface of the vehicle body panel 1 and the through hole 41 of the grommet body 14 is inclined according to the inclined posture of the electric wire group W, at least a part in the circumferential direction. Is provided on the inclination direction side from the orthogonal posture of the wire group W and the through hole 41.

  The inclination angle of one surface 23a of the outer flange portion 23 from the surface orthogonal to the axis of the cylindrical member 21 of the inner member 12 is not particularly limited, but in the present embodiment in which the entire circumference is a tapered surface, for example, several degrees It is above and is less than about 45 degrees. Further, in the present embodiment, the outer flange portion 23 is a tapered surface inclined so that the surface 23b opposite to the one surface 23a on the locking portion 22 side is also closer to the locking portion 22 in the axial direction toward the outer peripheral side. It has become.

  2 (a) and 2 (b), the grommet body 14 is formed from an elastic material having rubber elasticity (elasticity like rubber, meaning viscoelasticity), and the cylindrical portion of the inner member 12 A circular cover that closes the other end of 21 is formed. Further, a through hole 41 through which the wire harness W passes is formed at the center of the grommet body 14.

  Specifically, the grommet body 14 includes a cylindrical portion 42 having a through hole 41, a circular cover portion 43 concentrically and integrally coupled to the cylindrical portion 42, and an outer peripheral cover portion surrounding the outer flange portion 23 of the inner member 12. 44.

  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.

  As shown in FIG. 3 and FIG. 5, the annular plate portion 46 is adjacent to the one surface 23 a on the locking portion 22 side of the outer flange portion 23, and is in close contact with each other. Therefore, the annular plate portion 46 engages with the outer flange portion 23 on the one surface 23a side of the outer flange portion 23 in a part or all of the circumferential direction that becomes the tapered surface of the one surface 23a of the outer flange portion 23. An inwardly convex portion 47 is formed which enters the axial direction by the length dp and engages with the concave and convex portions. Further, the outer flange portion 23 is engaged with the grommet main body 14 so as to bite in the axial direction at an outer peripheral side end portion of the one surface 23a serving as a tapered surface.

  In the present embodiment, since the locking portion 22 of the inner member 12 has a plurality of hook-shaped locking claws 22a protruding outward in the radial direction so as to be locked to the opening edge 3 of the vehicle body panel 1, In the outer flange portion 23 of the inner member 12, a plurality of molding relief holes 26 corresponding to the plurality of locking claws 22a are formed at equal angular intervals. The opening shapes of the plurality of escape holes 26 are substantially fan-shaped, slightly larger than the substantially fan-shaped planar contour shape of the plurality of locking claws 22a in both the circumferential direction and the radial direction.

  Next, the operation will be described.

  In the present embodiment configured as described above, at least one of the annular plate portions 46 of the grommet body 14 in the circumferential direction between the opening edge portion 3 of the vehicle body panel 1 and the outer flange portion 23 of the inner member 12. The portion comes into contact with the outer flange portion 23 at a pressure about the contact pressure of the seal lip portion 45 on the one surface 23 a side of the outer flange portion 23.

  Further, the annular plate portion 46 of the grommet main body 14 is formed at the inner convex portion 47 of the outer flange portion of the inner member 12 within a part or all of the angular region in the circumferential direction where the one surface 23a of the outer flange portion 23 becomes a tapered surface. The concavo-convex engagement state enters the axial direction with respect to 23 by the engagement depth dp.

  Furthermore, the outer peripheral end of the outer flange portion 23 bites into the grommet main body 14 in the axial direction within a part or all of the circumferential angle region where the one surface 23a of the outer flange portion 23 becomes a tapered surface. It becomes.

  Therefore, even if a large force is generated between the inner member 12 and the grommet body 14 so as to separate them in a part or all of the circumferential direction, the annular plate portion 46 located on the one surface 23a side of the outer flange portion 23. However, the radial movement with respect to the outer flange portion 23 is effectively suppressed at the concave-convex engagement portion. As a result, the coupling state of the inner member 12 and the grommet body 14 is reliably maintained, and a sufficient holding force for the inner member 12 of the grommet body 14 can be secured.

  Therefore, for example, when the holding force with respect to the inner member 12 of the grommet body 14 is defined as the maximum holding force (detachment force) immediately before the release in the release test in which both of them are peeled off, the required maximum holding force is surely satisfied. It will be possible.

  In addition, in the present embodiment, since the force acts in the direction in which the annular plate portion 46 of the grommet body 14 bites into the escape hole 26 for molding the locking claw, the inner member 12 of the grommet body 14 also from this point. It is possible to more reliably increase the holding force against.

  Moreover, since the inner member 12 can be molded by a two-way molding die only in the mold opening / closing direction, the manufacturing cost can be reduced.

  As described above, in the present embodiment, it is possible to reliably increase the holding force of the grommet main body 14 against the inner member 12, and to reduce the cost of the grommet 10 that is excellent in workability when assembling these two parts. Can be provided.

(Other embodiments)
The grommet according to another embodiment shown in FIG. 6 is locked to the opening edge of the vehicle body panel in the same manner as in the above-described one embodiment, and is in a panel fixed state, and the inner member and the grommet main body are combined. Except for the part, the configuration is the same as that of the above-described embodiment. Accordingly, the same or similar configuration as that of the above-described one embodiment will be described below with reference to the corresponding constituent elements in FIGS. 1 to 5 and the differences between the present embodiment and the one embodiment. To do.

  As shown in FIG. 6, the grommet 10 of the present embodiment includes a resin inner member 52 and a grommet main body 54 having rubber elasticity.

  Although the inner member 52 has an overall shape substantially the same as that of the inner member 12 in the above-described embodiment, the outer flange portion 23 of the inner member 52 has a grommet body 54 on the one surface 23a that becomes a tapered surface. The annular plate portion 46 has a convex portion 23p that engages with the concave and convex portions. In the present embodiment, the convex portion 23p has an annular shape extending over the entire circumference of the outer flange portion 23, but may of course be installed in a part of the circumferential direction or adjacent to the circumferential direction or the radial direction. A plurality of convex portions 23p may be provided. Moreover, since it is sufficient if the concave and convex engagement is possible, the convex portion 23p may be a concave portion.

  Although the grommet main body 54 has the same general shape as the grommet main body 14 in the above-described embodiment, the annular plate portion 46 of the grommet main body 54 is a recess corresponding to the convex portion 23p of the outer flange portion 23. 46v. Therefore, in the present embodiment, the recess 46v is an annular groove extending over the entire circumference of the outer flange portion 23, but may of course be installed in a part of the circumferential direction or adjacent in the circumferential direction or the radial direction. A plurality of matching recesses 46v may be provided. Further, as long as the concave and convex engagement is possible, the concave portion 46v may be a convex portion, and a concave portion in place of the convex portion 23p may be formed in the outer flange portion 23.

  As shown in FIG. 6, the annular plate portion 46 includes a first annular plate surface portion 46 a and a second annular plate surface portion 46 b which are adjacent to and in close contact with the one surface 23 a of the outer flange portion 23 on both sides of the recess 46 v, and an inner member. And 12 inner peripheral surface portions 46 c close to the cylindrical portion 21. The first annular plate surface portion 46 a is in close contact with the radially inner side portion of the one surface 23 a of the outer flange portion 23. The second annular plate surface portion 46b is located radially outward from the first annular plate surface portion 46a, and is closer to the locking portion 22 than the first annular plate surface portion 46a in the axial direction of the inner member 52. positioned. Note that the second annular plate surface portion 46 b may be separated from the one surface 23 a of the outer flange portion 23 as long as the fitting state of the inner convex portion 47 to the convex portion 23 p is ensured.

  Also in this embodiment, the same effect as that of the above-described one embodiment can be obtained.

  Moreover, in the present embodiment, the outer flange portion 23 of the inner member 52 and the annular plate portion 46 of the grommet main body 54 are not only engaged with the concave and convex portions at the tapered surface portion, but also deeper at the concave and convex portions of the convex portion 23p and the concave portion 46v. Concavity and convexity will be engaged. Therefore, the coupling between the inner member 52 and the grommet main body 54 is strengthened, and the holding force of the grommet main body 54 on the inner member 52 can be more reliably increased.

  In each of the above-described embodiments, the inner convex portion 47 of the annular plate portion 46 of the grommet main body 14, 54 is unevenly engaged with the one surface 23 a side of the outer flange portion 23 of the inner member 12 in the entire circumference of the outer flange portion 23. However, as described above, even if the one surface 23a of the outer flange portion 23 is a tapered surface or the inner convex portion 47 of the annular plate portion 46 forms a plurality of concave and convex engaging portions adjacent in the circumferential direction. Good. And like other embodiment, even if it arrange | positions the part which the one surface 23a of the outer flange part 23 becomes a taper surface, and the inner convex part 47 of the cyclic | annular board part 46 in multiple rows so that it may adjoin to radial direction. Good.

  Further, the portion where the one surface 23a of the outer flange portion 23 becomes a tapered surface may be a partial region in the radial direction of the outer flange portion 23, and the one surface 23a has a flat surface inside and outside of the tapered surface portion, and the taper. The surface portion may be stepped, and the opposite surface 23b may be similarly formed. In any case, such an uneven portion is at least one in the vicinity of a portion where the force in the direction in which the grommet main bodies 14 and 54 are separated from the inner members 12 and 52 acts most greatly during the wiring work or in use. What is necessary is just to provide a location.

  Further, in each of the above-described embodiments, four ribs having four locking claws 22a are provided at intervals of 90 degrees. However, the locking claws 22a are formed according to the inner diameter of the panel opening and the required fixing strength. Needless to say, the number of installations can be arbitrarily set, for example, three.

  As described above, the present invention can reliably increase the holding force of the grommet body with respect to the inner member, and can provide a grommet excellent in workability when assembling these two parts. It is useful for all grommets that protect the wire group of the wire harness that penetrates the panel.

DESCRIPTION OF SYMBOLS 1 Body panel 1a Back surface 2 Opening 3 Opening edge part 10 Grommet 12 Inner member 14 Grommet main body 21 Cylindrical part 22 Locking part 22a Locking claw 22b One end part 22c Other end part 23 Outer flange part 23a One side (locking part side) One side)
23p convex portion 41 through hole 42 cylindrical portion 43 circular cover portion 44 outer peripheral cover portion 45 seal lip portion 46 annular plate portion 46a first annular plate surface portion 46b second annular plate surface portion 46c inner circumferential surface portion 46v recessed portion 47 inner convex portion 52 Inner member 54 Grommet body

Claims (2)

A cylindrical portion through which a wire group of the wire harness is inserted, a locking portion locked to an opening edge of the panel on one end side of the cylindrical portion, and a radial projection from the other end side of the cylindrical portion An inner member made of resin having an outer flange portion,
A grommet comprising a cover that closes the other end of the cylindrical portion and an elastic grommet body in which a through hole through which the wire group passes is formed,
The grommet body has a seal lip portion that can be engaged with the panel on the locking portion side of the outer flange portion, and supports the seal lip portion and is adjacent to one surface of the outer flange portion on the locking portion side. And an annular plate portion to be configured,
At least part of the outer flange portion in the circumferential direction, one side of the locking portion side that contacts the annular plate portion of the grommet body is inclined so that the outer peripheral side is closer to the locking portion in the axial direction. A grommet having a tapered surface.   2. The grommet according to claim 1, wherein the outer flange portion of the inner member has an uneven portion that engages with the annular plate portion of the grommet body on the tapered surface.

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