JP2002186154A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which enables the reduction of an inserting force, the improvement in sense of insertion, the increase of sticking force to a sitting hole, and the enhancement of workability using a simple constitutional change. SOLUTION: The grommet is composed of a grommet body 1, made of an elastic substance such as flexible resin, etc., and a locking member 2 made of resin to be fitted to the peripheral part of the grommet body 1. The grommet body 1 has a thick annular flange 11; an annular neck portion 12 which rises from the internal circumferential brim of the flange 11 in the axial direction; a small-diameter cylindrical portion 13 obliquely extending from the axial tip side of the neck portion 12; and a projecting portion 14, which is formed projecting in the radial direction in a uniting part of the small-diameter portion 13 to the neck portion 12 and has a diameter smaller than a fitting hole, and into its inside through hole 15, a wire harness is inserted. The locking member 2 has semi circular split bodies 21a, 21b, a hinge 22 for connecting end of the split body 21a to one end of the split body 21b, a locking claw 23 and a locking claw coupling part 24 which constitute a lock mechanism for uniting the other ends the split bodies 21a, 21b. When the split substances 21a, 21b are locked, the locking member 2 as a whole becomes an annular body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is mounted on a partition wall of an automobile or the like and through which a wire harness is inserted, and more particularly to a grommet having improved workability in mounting and a fixing force to a mounting hole.

[0002]

2. Description of the Related Art As a grommet used for a wire harness for an automobile, a retractable grommet or an inner grommet is often used. As shown in FIG. 8, the retractable grommet includes a small-diameter cylindrical portion 61 through which the wire harness 51 is inserted in close contact with the grommet, and a protrusion formed at the base end of the small-diameter cylindrical portion 61 to protrude in the radial direction. This is a rubber cylindrical body formed integrally with the portion 62 and an annular flange 63 formed on the base end side of the overhang portion 62. This grommet is provided with a mounting hole 53 formed in a partition wall 52 that separates an engine room such as an automobile from a room.
Is inserted from the distal end side of the small-diameter cylindrical portion 61 into the projecting portion 62.
Is elastically deformed to form a groove 6 between the overhang portion 62 and the flange 63.
4 is fitted to the mounting hole 53 by fitting the peripheral edge of the mounting hole 53 of the partition wall 52. In this type of grommet, a waterproof and soundproof seal is formed by the close contact between the end face of the flange 63 on the side of the projecting portion 62 and the partition wall 52.

As shown in FIG. 9, a grommet with an inner member is a combination of a grommet body 70 made of rubber and an inner member 80 made of resin. The grommet main body 70 includes a small-diameter cylindrical portion 71 through which the wire harness 51 is inserted in close contact, an annular flange 72 formed at the base end of the small-diameter cylindrical portion 71, and a grommet formed at the base end of the flange 72. Annular seal portion 73 and flange 7
An inner groove 74 is formed between the base end face 2 and the annular seal portion 73. The inner 80 includes an annular flange 81 fitted into the inner groove 74 of the flange 72,
For example, a plurality of locking claws 82 protrudingly provided at four locations in the circumferential direction and extending in the axial direction. The grommet has a resin locking claw 82 which is snap-fitted to a mounting hole 53 of the partition wall 52, and a mounting hole 53 of the partition wall 52 between the locking claw 82 and the seal portion 73.
Is attached to the partition wall 52 by sandwiching the peripheral portion of the partition wall. The grommet of this type includes a sealing portion 73 and a partition wall 5.
The waterproof and soundproof seals are formed by the close contact between the two.

[0004]

However, of the grommets described above, the retractable grommet is mounted by utilizing elastic deformation of rubber, so that it requires a strong force for insertion and has a poor insertion feeling. There was a problem. Further, when the rubber is elastically deformed by an external force, it may come off the partition. On the other hand, since the inner grommet is locked by a locking member such as a resin, the grommet is not easily detached, but the work of attaching the inner 80 to the grommet body 70 is troublesome, and the workability is poor. was there.

The present invention has been made in view of the above problems, and aims at reducing insertion force, improving insertion feeling, improving fixing force to a mounting hole, and improving workability with a simple structure change. The purpose of the present invention is to provide a grommet that enables the grommet to operate.

[0006]

A grommet according to the present invention is mounted in a mounting hole formed in a partition partitioning a first space and a second space, and has a wire harness inserted therein. A cylindrical grommet body made of an elastic body having a through hole through which the wire harness is inserted, and a resin mounted on an outer peripheral portion of the grommet body and engaged with a mounting hole of the partition wall. An annular locking member, wherein the grommet main body has a neck portion smaller in diameter than the mounting hole in which the locking member is mounted, and protrudes radially on one axial side of the neck portion. A projecting portion for regulating the movement of the locking member to one side in the axial direction; and a projection formed on the other side of the neck portion in the axial direction to move the locking member to the other side in the axial direction. And at the periphery A flange formed with an annular seal portion having a diameter larger than that of the mounting hole and being in close contact with the partition wall when the locking member is engaged with the partition wall; At least a part of the grommet body is attached to the neck portion of the grommet body so as to be sandwiched from a side surface of the grommet body, and the locking member body inserted into the mounting hole while being attached to the neck portion of the grommet body. When,
A collar portion projecting from the locking member main body to the outside of the mounting hole, and projecting outward from the locking member main body in a radial direction of the mounting hole, when the locking member main body is inserted into the mounting hole. The mounting hole peripheral edge of the partition wall is snap-coupled to the mounting hole peripheral edge portion of the partition wall, and clamps the mounting hole peripheral edge portion of the partition wall with the flange portion.
A plurality of locking claws arranged in a circumferential direction of the locking member main body.

According to the present invention, a neck portion having a smaller diameter than the mounting hole is formed in the cylindrical grommet body, and an annular locking member is provided on the neck portion, and a part thereof is opened to form the neck portion. The structure can be mounted so as to be sandwiched from the side surface of the grommet, so that the locking member can be easily attached to the grommet body, and the assembling workability can be improved. Moreover, according to the present invention, the grommet is mounted in the mounting hole by inserting the locking member made of resin into the mounting hole of the partition wall and snap-locking the locking claw to the periphery of the mounting hole. The insertion force can be reduced and the insertion feeling can be improved. In addition, the fixing to the partition is performed by a resin locking member, and the waterproof and soundproof seal with the partition is
Since the sealing is performed at the annular sealing portion formed on the flange of the grommet main body made of an elastic body, a long-term stable fixing force to the mounting hole and sealing performance can be maintained.

[0008] The locking member includes, for example, two divided bodies obtained by dividing an annular body, a hinge connecting one end of each of the divided bodies, and a pair of other ends of the divided bodies. And a lock mechanism for coupling the two. Further, the collar portion of the locking member is, for example, a large-diameter annular portion having a larger diameter than the mounting hole, and the locking member main body has a smaller diameter than the mounting hole extending in the axial direction from one end surface of the large-diameter annular portion. The small-diameter annular portion may be configured such that the plurality of locking claws protrude radially from the outer peripheral surface of the small-diameter annular portion.

The neck portion of the grommet main body is formed so as to have a tapered outer peripheral surface having a small diameter on the overhang portion side and a large diameter on the flange side, and the locking member main body has a grommet having an inner diameter on the overhang portion side. When the locking member is attached to the neck portion of the grommet body, the locking member is turned in the opposite direction to the neck portion of the grommet body, assuming that the annular body is set to be substantially equal to the outer diameter of the overhang portion side of the neck portion of the main body. It can be prevented from being attached to the device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below with reference to the accompanying drawings. FIG.
It is a perspective view showing an outline of a grommet concerning one embodiment of the present invention. The grommet according to the present embodiment includes a grommet main body 1 made of an elastic body such as rubber or flexible resin, and a resin locking member 2 mounted on an outer peripheral portion of the grommet main body 1. 2 and 3 show a plan view and a cross-sectional view of the grommet body 1 as viewed from the side, respectively.

The grommet main body 1 includes a thick annular flange 11, an annular neck portion 12 which rises in the axial direction from the inner peripheral edge of the flange 11, and a small-diameter cylinder obliquely extending from the axial front end of the neck portion 12. A portion 13 and a projecting portion 14 having a smaller diameter than the mounting hole formed so as to project radially at a connecting portion between the small-diameter cylindrical portion 13 and the neck portion 12. A wire harness (not shown) is inserted therethrough. The flange 11 has a larger diameter than the mounting hole of the not-shown partition wall, has a shallow groove 16 formed on an end face connected to the neck part 12, and has an annular part extending obliquely outward in the direction of the neck part 12 and in the radial direction on the periphery of the end face. Is formed. The neck portion 12 has a smaller diameter than the mounting hole of the partition wall,
One side has a tapered outer peripheral surface having a large diameter. The small-diameter cylindrical portion 13 allows a wire harness (not shown) to pass therethrough in a close contact state.

FIGS. 4 and 5 show a plan view of the locking member 2 in an open state and a side view of the locking member 2 in a closed state, respectively. Locking member 2
Are divided into semicircular divided bodies 21a and 21b,
Hinge 22 for connecting one end of each of 1a and 21b
And a lock claw 23 and a lock claw engaging portion 24 which constitute a lock mechanism for connecting the other ends of the divided bodies 21a and 21b.
And As a result, the divided bodies 21a and 21b have a structure that can be opened and closed in a plane orthogonal to the central axis thereof, and can be mounted so as to be sandwiched from the side of the neck part 12 of the grommet main body 1. When the divided bodies 21a and 21b are locked, the entirety of the locking member 2 becomes an annular body. The annular body has a flange 25 which is an annular body having a diameter larger than the mounting hole, an annular locking member main body 26 having a diameter smaller than the mounting hole and rising from the inner peripheral edge of the flange 25 in the axial direction. ,
Locking claws 27 are provided at four positions in the circumferential direction, which protrude radially from the outer peripheral surface of the locking member main body 26.

FIG. 6 is a sectional view showing a state in which the locking member 2 is attached to the grommet body 1. As shown, the locking member 2 is attached to the neck 12 of the grommet body 1 from the side. The end of the locking member 2 opposite to the flange 25 of the locking member main body 26 slightly extends toward the inner diameter side, and the inner diameter thereof is set substantially equal to the outer diameter of the neck portion 12 on the side of the projecting portion 14. Have been. Therefore, even if the locking member 2 is erroneously attached to the grommet body 1 upside down, the outer diameter of the neck portion 12 on the flange 11 side is larger than the outer diameter of the protruding portion 14 side. The member 2 cannot be mounted. Thereby, erroneous mounting can be prevented. Locking member 2
The grommet is mounted on the grommet main body 1 in a state in which the upper end portion in the drawing abuts the overhang portion 14 and the lower end flange portion 25 is accommodated in the shallow groove 16 of the flange 11.

FIG. 7 is a sectional view showing a state in which the grommet is mounted in the mounting hole 53 of the partition wall 52. When the grommet is inserted into the mounting hole 53 from the small-diameter cylindrical portion 13 side, the locking claw 27 of the locking member 2 is inscribed in the mounting hole 53, and the flange 11 is further moved upward from the lower side in the figure. The locking claw 27 is bent, and the stepped portion 28 at the lower end of the locking claw 27 is bent.
And the inner peripheral edge of the mounting hole 53 are snap-engaged. Thereby, the locking member 2 sandwiches the partition wall 52 from both sides by the step portion 28 and the flange portion 25 of the locking claw 27, and also holds the partition wall 52 from the inside of the mounting hole 53 by the step portion 28 of the engaging claw 27. It will be kept outside. At this time, the flange 11
Since the seal portion 17 formed on the outer peripheral edge of the seal member is in close contact with the partition wall 52, a waterproof and soundproof seal is formed at this portion.

[0015]

As described above, according to the grommet according to the present invention, a neck portion having a smaller diameter than the mounting hole is formed in the cylindrical grommet body, and an annular locking member is formed on the neck portion. Can be installed so that a part of it can be opened and sandwiched from the side of the neck part,
It is easy to attach the locking member to the grommet body,
The assembling workability can be improved. Moreover, according to the present invention, the grommet is mounted in the mounting hole by inserting the locking member made of resin into the mounting hole of the partition wall and snap-locking the locking claw to the periphery of the mounting hole.
The insertion force can be reduced and the insertion feeling can be improved. Also, the fixing to the partition is performed by a resin locking member, and the waterproof and soundproof seal with the partition is performed by an annular seal portion formed on the flange of the grommet body made of an elastic body. This has an effect that a long-term stable fixing force and sealing performance to the mounting hole can be maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overview of a grommet according to an embodiment of the present invention.

FIG. 2 is a plan view showing a main part of a grommet main body constituting the grommet.

FIG. 3 is a cross-sectional view showing a main part of a grommet main body constituting the grommet.

FIG. 4 is a plan view showing a main part of a locking member constituting the grommet.

FIG. 5 is a side view showing a main part of a locking member constituting the grommet.

FIG. 6 is a sectional view showing a main part of the grommet.

FIG. 7 is a sectional view when the grommet is attached to a partition.

FIG. 8 is a view for explaining a conventional grommet.

FIG. 9 is a view for explaining a conventional grommet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Grommet main body, 11 ... Flange, 12 ... Neck part, 13 ... Small diameter cylinder part, 14 ... Overhang part, 15 ... Through-hole, 1
6 ... shallow groove, 17 ... seal part, 2 ... locking member, 21 ... divided body, 22 ... hinge, 23 ... lock claw, 24 ... lock claw engaging part, 25 ... brim part, 26 ... locking member body, 27: locking claw, 28: stepped portion, 52: partition wall.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J040 AA01 AA13 AA17 BA02 CA04 EA01 EA16 FA05 HA03 HA15 5G357 DA02 DB03 DC12 DD01 DD05 5G363 AA07 BA02 CA17 CB08

Claims (4)

[Claims] 1. A grommet that is mounted in a mounting hole formed in a partition that separates a first space and a second space, and that has a wire harness inserted therein, wherein the wire harness is inserted. A cylindrical grommet main body made of an elastic body having a through hole formed therein, and an annular locking member made of a resin mounted on an outer peripheral portion of the grommet main body and engaged with the mounting hole of the partition wall, The grommet main body includes a neck portion having a smaller diameter than the mounting hole in which the locking member is mounted, and one side in the axial direction of the locking member that protrudes radially on one axial side of the neck portion. And a protrusion formed on the other axial side of the neck to restrict the movement of the locking member to the other axial side, and to provide the mounting hole in the peripheral edge. The locking member is larger in diameter than the front A flange formed with an annular seal portion that is in close contact with the partition wall when engaged with the partition wall, wherein the locking member is configured such that at least a part of the annular body is opened and a neck portion of the grommet body is formed. A locking member body inserted into the mounting hole while being mounted on a neck portion of the grommet body, and an outer side of the mounting hole from the locking member body. A flange that projects to the outside in the radial direction of the mounting hole from the locking member main body, and is snap-coupled to the mounting hole peripheral edge of the partition when the locking member main body is inserted into the mounting hole. A grommet comprising: a plurality of locking claws arranged in a circumferential direction of the locking member main body, the plurality of locking claws interposing a peripheral edge of a mounting hole of the partition wall between the flange and the flange. 2. The locking member according to claim 1, wherein: the annular member is divided into two divided bodies; a hinge connecting one end of each of the divided bodies; and the other end of each of the divided bodies. The grommet according to claim 1, further comprising a lock mechanism for coupling the grommet. 3. The collar of the locking member is a large-diameter annular portion having a diameter larger than the mounting hole, and the locking member main body extends in an axial direction from one end face of the large-diameter annular portion. The grommet according to claim 1 or 2, wherein the grommet is a small-diameter annular portion having a diameter smaller than the mounting hole, and the plurality of locking claws project in a radial direction from an outer peripheral surface of the small-diameter annular portion. . 4. The neck portion of the grommet main body has a tapered outer peripheral surface having a small diameter on the overhang portion side and a large diameter on the flange side. 4. An annular body whose inner diameter is set substantially equal to the outer diameter of the neck portion of the grommet body on the side of the overhanging portion.
The grommet according to any one of the above.