JP2016005382A - Grommet fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet fitting structure that can be mounted in a through-hole of a fitting plate with a small insertion force.SOLUTION: A grommet 50 includes: a cylindrical part 51 that can be inserted in a through-hole 41 of a fitting plate 40; a positioning protrusion 52 that is protrusively provided in an outer periphery of the cylindrical part 51 and is abutted to an opening edge of the through-hole 41 for regulating the insertion into the through-hole 41; and a locking protrusion 53 which is protrusively provided in the outer periphery of the cylindrical part 51 for holding an edge 42 of the through-hole 41 between the locking protrusion 53 and the positioning protrusion 52. The locking protrusion 53 is provided only in a partial range in a circumferential direction that is opposite while interposing the cylindrical part 51 therebetween, and the through-hole 41 in which the grommet 50 is mounted includes a notched part 43 in which the locking protrusion 53 can be inserted.

Description

  The present invention relates to a grommet mounting structure.

  The following Patent Document 1 and Patent Document 2 disclose a grommet mounting structure used when a wire harness is assembled by penetrating a mounting plate such as a vehicle body panel.

  These grommet mounting structures described in Patent Document 1 and Patent Document 2 are similar in structure, and as shown in FIG. 8, an elastic material such as synthetic rubber is inserted into the through hole 111 of the mounting plate 110 through which the wire harness 100 is inserted. The grommet 120 formed by fitting is attached.

  The grommet 120 fitted and attached to the through-hole 111 sandwiches the peripheral portion 111a of the through-hole 111 between the positioning projection 122 and the locking projection 123 that project from the outer periphery of the cylindrical portion 121 that is inserted through the through-hole 111. Thus, the mounting plate 110 is fixed.

  Each of the positioning protrusions 122 and the locking protrusions 123 provided in the grommet 120 has a hook shape extending over the entire outer periphery of the cylindrical part 121. When the grommet 120 is fitted into the through-hole 111, the locking protrusion 123 is pushed into the through-hole 111 with a pressing force greater than or equal to a predetermined value, so that the range B overlapping the peripheral edge 111a of the locking protrusion 123 is elastic. By deforming, the state where the locking projection 123 has passed through the through hole 111 is obtained.

Japanese Utility Model Publication No. 6-72127 JP-A-11-155225

  However, in the grommet mounting structure described in Patent Document 1 and Patent Document 2 described above, when the grommet 120 is fitted into the through hole 111 of the mounting plate 110, the locking protrusion 123 is elastically deformed by a pushing operation. For this reason, there is a problem that a large insertion force is required and the mounting property is poor.

  Accordingly, an object of the present invention is to provide a grommet mounting structure that can be mounted in a through hole of a mounting plate with a small insertion force, in order to solve the above-described problems.

The above-described object of the present invention is achieved by the following configuration.
(1) A grommet mounting structure comprising a grommet and a mounting plate to which the grommet is mounted,
The grommet is
A cylindrical portion that can be inserted through a through hole formed through the mounting plate;
A positioning protrusion that protrudes from the outer periphery of the tubular part and contacts the opening edge of the through hole when the tubular part is inserted into the through hole;
A peripheral edge portion of the through-hole between the positioning protrusion and the outer periphery of the cylindrical portion that is spaced apart from the positioning protrusion in the axial direction of the cylindrical portion by an amount corresponding to the thickness of the mounting plate. A locking projection that fixes the grommet to the through hole by sandwiching
With
The locking projection is equipped only in a partial range in the circumferential direction facing the cylindrical portion,
The grommet mounting structure characterized in that the through-hole to which the grommet is mounted is provided at a position corresponding to the mounting position of the locking protrusion, and has a notch portion through which the locking protrusion can be inserted. .

  (2) The locking protrusion and the notch are provided in two quarters across the cylindrical portion in a range of about ¼ circumference, as described in (1) above Grommet mounting structure.

  According to the configuration of (1) above, when the grommet is fitted into the through hole of the mounting plate, the position of the locking projection is such that the locking projection of the grommet is inserted through the notch of the through hole. The grommet is inserted into the through hole in alignment with the notch of the through hole. Then, when the locking protrusion passes through the notch and the positioning protrusion contacts the opening edge of the through hole, until the locking protrusion of the grommet is removed from the position of the notch and overlaps with the peripheral edge of the through hole, The grommet is rotated relative to the through hole. Then, the positioning protrusion and the locking protrusion of the grommet are in a state of sandwiching the peripheral edge of the through hole, and are fixed to the through hole.

  That is, since the grommet does not require a forceful pushing operation for elastically deforming the locking projection, it can be attached to the through-hole of the mounting plate with a small insertion force, and an excellent mounting property can be obtained.

  According to the configuration of the above (2), the gripping part in which the positioning protrusion and the locking protrusion of the grommet sandwich the peripheral edge of the through hole is formed at a diagonal position that sandwiches the tubular part of the grommet. It is possible to obtain a stable fixed state in which the shape portion is unlikely to be inclined.

  In addition, since the position where the locking protrusion and the notch are equipped is a diagonal position opposite to the cylindrical part, when removing the locking protrusion through the notch from the position of the notch, If the cylindrical portion is rotated approximately ¼, it is possible to obtain a state in which substantially the entire area of the locking projection overlaps the peripheral edge portion of the through hole, and the rotating operation of the cylindrical portion can be facilitated.

  According to the grommet mounting structure according to the present invention, the grommet mounting structure can be mounted in the through hole of the mounting plate with a small insertion force.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a longitudinal sectional view of an embodiment of a grommet mounting structure according to the present invention. 2 is an exploded perspective view of the grommet mounting structure shown in FIG. 3 is a view taken in the direction of arrow A in FIG. 4 is a view taken in the direction of arrow B in FIG. FIG. 5 is a plan view showing a state in the middle of a rotation operation in which the locking projection that has passed through the notch portion of the through hole is removed from the position of the locking projection in the grommet mounting structure of one embodiment of the present invention. FIG. 6 is a perspective view of a grommet mounting structure as a comparative example with respect to one embodiment of the present invention. FIG. 7 is a longitudinal sectional view of the grommet shown in FIG. FIG. 8 is an explanatory view of a conventional grommet mounting structure.

  Hereinafter, a preferred embodiment of a grommet mounting structure according to the present invention will be described in detail with reference to the drawings.

  1 to 5 show an embodiment of a grommet mounting structure according to the present invention, FIG. 1 is a longitudinal sectional view of an embodiment of the grommet mounting structure according to the present invention, and FIG. 2 is shown in FIG. FIG. 3 is an exploded perspective view of the grommet mounting structure, FIG. 3 is a view as viewed from an arrow A in FIG. 2, FIG. 4 is a view as viewed from an arrow B in FIG. It is a top view which shows the state in the middle of rotation operation which removes the latching protrusion which passed through from the position of a latching protrusion.

  The grommet mounting structure of this embodiment is a structure in which a grommet 50 integrally formed of synthetic rubber or the like is mounted in a through hole 41 of a mounting plate 40 through which a corrugated tube 30 that is an exterior product of a wire harness is inserted.

  In the case of this embodiment, the attachment plate 40 is a substantially disk-shaped member that is detachably attached to an opening of a vehicle body panel, for example. The through hole 41 is provided through the center of the substantially disc-shaped mounting plate 40. The inner diameter d1 of the through hole 41 is set to a size that allows insertion of a cylindrical portion 51 of a grommet 50 described later.

  The through hole 41 is provided with notches 43 formed by notching the peripheral edge 42 of the through hole 41 at two opposite locations on the inner periphery.

  These notches 43 are notches into which a locking projection 53 of a grommet 50 described later can be inserted. These notches 43 are equipped at positions corresponding to the equipment positions of the locking projections 53 of the grommet 50 described later. As shown in FIG. 3, each notch 43 has a diagonal portion of the peripheral edge portion 42 in a range of about ¼ circumference (a range of about 90 ° from the center of the through hole 41) and an inner diameter of d 2. It is cut into a fan shape.

  The grommet 50 is an integrally molded product made of an elastic material such as synthetic rubber. As shown in FIGS. 1 and 2, the grommet 50 has a cylindrical portion 51 through which a through-hole 41 formed through the mounting plate 40 can be inserted, and this cylindrical shape. A positioning projection 52 and a locking projection 53 provided on the outer periphery of the portion 51 and a tube locking projection 54 provided on the inner periphery of the tubular portion 51 are provided.

  The positioning protrusion 52 protrudes from the outer periphery of the tubular part 51 in a hook shape. As shown in FIG. 1, when the cylindrical portion 51 is inserted into the through-hole 41, the positioning protrusion 52 abuts on the opening edge 41 a of the through-hole 41 positioned in front of the insertion direction, so that the cylindrical portion 51 Restrict insertion.

  As shown in FIG. 1, the locking projection 53 protrudes from the positioning projection 52 on the outer periphery of the cylindrical portion 51 at a position separated from the positioning projection 52 in the axial direction of the cylindrical portion 51 by an amount corresponding to the plate thickness. Has been. As shown in FIG. 1, the locking projection 53 fixes the grommet 50 to the through-hole 41 by sandwiching the peripheral portion 42 of the through-hole 41 with the positioning projection 52.

  In the case of the present embodiment, the locking projection 53 is provided only in a partial range in the circumferential direction at a position opposed to each other with the cylindrical portion 51 interposed therebetween. In the case of this embodiment, the installation position of the cylindrical part 51 is two places which oppose on both sides of the cylindrical part 51, as shown in FIG. Further, as shown in FIG. 4, each cylindrical portion 51 is provided in a range of about ¼ circumference (a range of about 90 ° with respect to the center of the cylindrical portion 51). However, each cylindrical part 51 is formed slightly smaller than the notch part 43 so that the notch part 43 of the above-mentioned through-hole 41 can be inserted.

  As shown in FIG. 1, the tube locking projection 54 is a projection that engages with the groove 31 of the corrugated tube 30 that passes through the inside of the cylindrical portion 51, and is provided in a ring shape that goes around the inner periphery of the cylindrical portion 51. Has been.

  In the grommet mounting structure of the embodiment described above, when the grommet 50 is fitted into the through hole 41 of the mounting plate 40, the locking projection 53 of the grommet 50 passes through the notch 43 of the through hole 41. As described above, the grommet 50 is inserted into the through hole 41 by aligning the position of the locking projection 53 with the position of the notch 43 of the through hole 41. When the locking projection 53 passes through the notch 43 and the positioning projection 52 contacts the opening edge of the through hole 41, the locking projection 53 of the grommet 50 is disengaged from the position of the notch 43, and the through hole The grommet 50 is rotated relative to the through hole 41 as indicated by an arrow R1 in FIG. Then, as shown in FIG. 1, the positioning projection 52 and the locking projection 53 of the grommet 50 sandwich the peripheral edge 42 of the through hole 41 and are fixed to the through hole 41.

  That is, since the grommet 50 does not require a forceful pushing operation for elastically deforming the locking projection 53, the grommet 50 can be attached to the through hole 41 of the mounting plate 40 with a small insertion force, and an excellent mounting property can be obtained. it can.

  Further, in the case of the grommet mounting structure according to the embodiment, the gripping portion in which the positioning projection 52 and the locking projection 53 of the grommet 50 sandwich the peripheral portion 42 of the through hole 41 sandwiches the cylindrical portion 51 of the grommet 50. Since it is formed at the corner position, it is possible to obtain a stable fixed state in which the cylindrical portion 51 is hardly inclined.

  In addition, since the position where the locking projection 53 and the notch 43 are equipped is a diagonal position facing the cylindrical portion 51, the locking projection 53 inserted through the notch 43 is the position of the notch 43. When removing from the cylindrical portion 51, if the cylindrical portion 51 is rotated approximately ¼, it is possible to obtain a state in which substantially the entire area of the locking projection 53 overlaps the peripheral edge portion 42 of the through hole 41. Can be easily rotated.

[Comparative example]
6 is a perspective view of a grommet mounting structure as a comparative example with respect to the above-described embodiment of the present invention, and FIG. 7 is a longitudinal sectional view of the grommet shown in FIG.

  In this comparative example, the grommet mounting structure is such that a grommet 50A corresponding to the grommet 50 of one embodiment is mounted in the through hole 41 of the mounting plate 40A corresponding to the mounting plate 40 of one embodiment.

  However, the through hole 41 of the mounting plate 40A is not equipped with the notch 43 shown in the embodiment, and is a simple circular hole.

  The grommet 50 </ b> A is fixed to the through-hole 41 by sandwiching the peripheral edge 42 of the through-hole 41 between the positioning projection 52 and the locking projection 53 </ b> A that project from the outer periphery of the tubular portion 51. However, the locking protrusion 53 </ b> A in the comparative example has a structure that is continuous over the entire outer periphery of the cylindrical portion 51.

Therefore, when the grommet 50A is fitted into the through hole 41, a large insertion operation force is required to elastically deform the portion 531 overlapping the peripheral edge portion 42 of the through hole 41 of the locking projection 53A in the diameter reducing direction. As a result, there arises a problem that the mountability is poor.
Such a problem does not occur in the grommet mounting structure of the above-described embodiment.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, the number of equipment of the locking protrusion 53 and the notch 43 is not limited to the two places shown in the embodiment, and can be set to an arbitrary number of three or more places. However, the smaller the number of equipment, the larger the angular range of one locking protrusion 53 that overlaps the peripheral edge 42, and the locking protrusion even when the grommet rotates relative to the through hole 41 due to external vibration or the like. There is no risk that 53 reaches the adjacent notch 43 and falls off.

  Here, the features of the above-described embodiments of the grommet mounting structure according to the present invention are summarized and listed in the following [1] to [2], respectively.

[1] A grommet mounting structure comprising a grommet (50) and a mounting plate (40) to which the grommet (50) is mounted,
The grommet (50)
A cylindrical portion (51) that can be inserted through a through hole (41) formed through the mounting plate (40);
When protruding from the outer periphery of the cylindrical part (51) and inserting the cylindrical part (51) into the through hole (41), the insertion is restricted by contacting the opening edge v of the through hole (41). A positioning protrusion (52);
The positioning protrusion (52) is protruded from the outer periphery of the cylindrical portion (51) that is separated in the axial direction of the cylindrical portion (51) by an amount corresponding to the plate thickness of the mounting plate (40). A locking protrusion (53) for fixing the grommet (50) to the through hole (41) by sandwiching a peripheral edge (42) of the through hole (41) between the protrusion (52) and
With
The locking projection (53) is equipped only in a partial range in the circumferential direction facing the cylindrical portion (51).
The through hole (41) in which the grommet (50) is mounted is provided at a position corresponding to the mounting position of the locking projection (53), and is a notch through which the locking projection (53) can be inserted. A grommet mounting structure comprising a portion (43).

  [2] The locking protrusion (53) and the notch (43) are provided in a range corresponding to about ¼ circumference at two locations facing each other across the cylindrical portion (51). The grommet mounting structure according to the above [1].

40 mounting plate 41 through-hole 41a opening edge 42 peripheral edge portion 43 notch portion 50 grommet 51 cylindrical portion 52 positioning protrusion 53 locking protrusion

Claims (2)

A grommet mounting structure comprising a grommet and a mounting plate to which the grommet is mounted,
The grommet is
A cylindrical portion that can be inserted through a through hole formed through the mounting plate;
A positioning protrusion that protrudes from the outer periphery of the tubular part and contacts the opening edge of the through hole when the tubular part is inserted into the through hole;
A peripheral edge portion of the through-hole between the positioning protrusion and the outer periphery of the cylindrical portion that is spaced apart from the positioning protrusion in the axial direction of the cylindrical portion by an amount corresponding to the thickness of the mounting plate. A locking projection that fixes the grommet to the through hole by sandwiching
With
The locking projection is equipped only in a partial range in the circumferential direction facing the cylindrical portion,
The grommet mounting structure characterized in that the through-hole to which the grommet is mounted is provided at a position corresponding to the mounting position of the locking protrusion, and has a notch portion through which the locking protrusion can be inserted. .   2. The grommet mounting structure according to claim 1, wherein the locking protrusion and the notch are provided in a range corresponding to about ¼ circumference at two locations facing each other across the cylindrical portion.

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