JP5516104B2 - Grommet mounting structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a grommet body mounting structure, and more particularly, to a bolt tightening grommet that is externally mounted on a wire harness routed to a vehicle and mounted in a through hole of the vehicle body to achieve waterproofing, dustproofing, and sound insulation. The improvement of the water stop performance of the site | part away from the location is aimed at.

When wiring a wire harness through a through hole provided in the body of an automobile, a grommet is externally mounted on the wire harness at the insertion point of the through hole to achieve waterproofing, dustproofing, and sound insulation.
As this type of grommet, an integral grommet made only of an elastic body such as rubber or elastomer, a two-piece grommet in which a resin inner of a resin molded product is combined with a grommet body made of an elastic body, and a grommet made of an elastic body There is a type in which a body is covered with a metal plate, a mounting hole formed in the grommet body is passed through, and the grommet body is sandwiched between the metal plate and the vehicle body and bolted.

Each of the various grommets described above has advantages and disadvantages, and is used corresponding to the wiring environment of the wire harness.
A grommet that abuts the metal plate on the grommet body and bolts has an advantage that the grommet can be firmly fixed to the vehicle body. Therefore, when the diameter of the wire harness is increased and the diameter of the through hole provided in the vehicle body is increased, the load is uniformly applied only by locking the periphery of the through hole in the vehicle body locking groove provided in the grommet made of an elastic body. Bolt tightening grommets may be used due to problems such as difficulty in securing and sealing performance.

The present applicant provides a vehicle body mounting structure using this type of bolt tightening grommet in Japanese Patent Application Laid-Open No. 2002-233034. As shown in FIGS. 6 (A) and 6 (B), the vehicle body panel P is provided with an L-shaped locking piece Pa below the drilled through hole Pc and a bolt hole upward. Pb is provided. On the other hand, a locking groove 111 for locking the locking piece Pa is provided at the lower end of the grommet main body 100 made of an elastic body and the metal plate 110 to be mounted on the flange portion 100a of the grommet main body 100, and the bolt hole Pb. Bolt holes 112 that communicate with each other are provided. Further, a seal lip 100b is projected from the vehicle body contact surface of the flange portion 100a.
To attach the grommet to the vehicle body panel P, the wire harness W / H inserted through the grommet body 100 is passed through the through hole Pc of the vehicle body panel P, and the locking groove 111 provided at the lower ends of the grommet body 100 and the metal plate 110 is provided in the vehicle body. The bolts 120 are locked to the locking pieces Pa of the panel, and then bolts 120 are inserted into the bolt holes 112 and Pb and fastened.

The grommet vehicle body mounting structure shown in FIG. 6 improves the recyclability by allowing the grommet to be easily detached from the vehicle body when the vehicle is scrapped.
However, fixing with the bolt 120 is only at one place on the upper end side of the grommet body 100, and the lower end is only hooked on the locking groove 111 on the locking piece Pa. Therefore, the flange portion 100a of the grommet body 100 can be brought into close contact with the vehicle body panel P at the periphery on the upper end side fastened by the bolt 120, and the sealing lip can be crushed to ensure the sealing performance. However, in the part away from the fastening part by the bolt 120, particularly in the lower part only hooked on the locking piece Pa, the force for bringing the flange part 100a into close contact with the vehicle body panel P is not loaded, and the seal lip 100b is not attached to the vehicle body. It is not pressed against the panel P. For this reason, a gap is generated between the vehicle body panel P and water stoppage cannot be ensured.

  The above-described problem can be solved by fastening the grommet body and the metal plate with bolts in the same manner as above and below the through hole of the vehicle body panel. However, when bolting the lower part, or when fastening the nut 140 by passing the stud bolt 130 protruding from the vehicle body panel P through the bolt holes provided in the grommet body 100 and the metal plate 110 as shown in FIG. Often space is not available or blind work is required.

JP 2002-233034 A

  The present invention has been made in view of the above problems. When a work space for bolt tightening (or nut tightening) cannot be taken or a blind work is performed, a bolt or a nut is attached to a place where the work space cannot be taken. An object of the present invention is to provide a grommet mounting structure for a grommet that can ensure sealing performance against the vehicle body without performing a fastening operation.

In order to solve the above-described problems, the present invention provides a cylindrical portion through which a wire harness routed in a vehicle is inserted, a flange portion protruding in an outer diameter direction from one end of the cylindrical portion, and a vehicle body contact side of the flange portion A grommet body made of rubber or elastomer having a sealing lip projecting from
A grommet comprising a metal plate or a fixed plate made of a resin plate that covers the side opposite to the vehicle body contact side of the flange portion of the grommet body;
While providing a bolt hole in communication with the flange portion of the grommet body integrated with the laminated plate and at least the upper central portion of the fixing plate and projecting a downward L-shaped projection outward at the lower end central portion,
A stud bolt protruding from the vehicle body is passed through the bolt hole, while a support rod protruding from the vehicle body is passed through the downward L-shaped projection, and both sides of the support rod are supported on both sides of the downward L-shaped projection. Place on the outer surface side of the pressing part,
The stud bolt that has passed through the bolt hole of the grommet is tightened with a nut, and the seal lip of the grommet body is crushed against the vehicle body by rotating the grommet body and the fixing plate. A grommet body mounting structure is provided in which this portion is pressed against and fixed to the support rod.

  According to the vehicle body mounting structure of the grommet, the stud bolt on the vehicle body side is passed through the bolt hole on the upper end of the grommet with the downward L-shaped projection on the lower end of the grommet covered on the support rod on the vehicle body side, and the nut is inserted into the stud bolt. When the screws are tightened and the screws are tightened, the grommet rotates in a direction in which the upper end side approaches the vehicle body while the lower end is supported. When the rotated grommet comes into contact with the vehicle body and the nut is further tightened, the seal lip projecting from the grommet is crushed against the vehicle body, and sealing performance can be secured. And when the upper end side of the grommet is rotated toward the vehicle body side, the lower end side is loaded in a direction away from the vehicle body, and the surface of the fixing plate can be pressed against the side surface of the support rod protruding from the vehicle body. The lower end of the grommet can be fixed to the vehicle body without rattling.

Supporting and attaching both ends of the support rod to a pair of metal brackets protruding from the vehicle body,
The downward L-shaped projection provided on the grommet is provided with a pair of left and right cutouts or slits with a gap between the laminated grommet body and the fixing plate, and a central portion sandwiched between the cutouts or slits on both sides. Refracted into an L shape to form downward L-shaped projections on both sides of the opening so that the downward L-shaped projections can be inserted over the support rods from above, and both sides sandwiching the downward L-shaped projections are supported rod pressing portions. It is said.

  The fixing plate is made of an annular metal plate, and its peripheral portion is bent and attached to the flange portion of the grommet body.

The grommet main body and the fixing plate may have a substantially rhombus shape with an arcuate apex, and the bolt hole may be provided at the upper center and the left and right corners, and the downward L-shaped projection may be provided at the lower end portion.
In this case, it is preferable to attach and tighten the nuts to the stud bolts passed through the left and right bolt holes after attaching and tightening the nuts to the stud bolts passed through the upper end bolt holes.

  The vehicle body to which the grommet of the present invention is attached is a dash panel or a floor panel that partitions the engine room and the vehicle compartment of the automobile, and the grommet is externally mounted on a wire harness that passes through a through hole provided in the dash panel or floor panel.

In the grommet mounting structure according to the present invention, the stud bolt is inserted into a place where the nut can be fastened to the stud bolt inserted through the bolt hole of the grommet, and the support rod is projected from the vehicle body at the place where the nut cannot be fastened. The support bar is covered with a downward L-shaped projection that protrudes from the fixing plate of the grommet. In this state, the nut is fastened to a stud bolt to which the nut is fastened, the grommet is rotated with the support rod as a fulcrum side, pressed against the vehicle body, and the seal lip provided on the grommet is crushed. In addition, the downward L-shaped projection is pressed against the support rod and fixed by the rotation of the grommet.
In this way, the grommet can be firmly fixed to the vehicle body via the support bar at the location where the nut cannot be tightened, and the grommet is rotated to squeeze the seal lip against the vehicle body when the nut is tightened. It is possible to reliably press-contact, prevent water from being generated through the through hole, and improve the water stop performance.

It is sectional drawing which shows 1st Embodiment of this invention. The grommet used by 1st Embodiment is shown, (A) is a side view, (B) is a principal part perspective view, (C) is the CC sectional schematic drawing of (A). It is a perspective view of the vehicle body which attaches a grommet. It is drawing which shows the process of fixing a grommet to the periphery of the through-hole of a vehicle body. (A) (B) is the schematic which shows 2nd Embodiment. (A) (B) is drawing which shows a prior art example. It is drawing which shows another prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The grommet 1 is externally mounted on a wire harness W / H routed from the engine room (X) of the automobile to the vehicle compartment (Y), and the wire harness W / H is inserted into a through hole 51 formed in the vehicle body 50 formed of a dash panel. The grommet 1 is fixed to the engine room side surface 50a of the vehicle body 50 (hereinafter referred to as the vehicle compartment outer surface 50a) with bolts and nuts.
The grommet 1 is fixed in such a manner that a stud bolt 55 is projected above the through hole 51 of the vehicle body 50 and a support rod 60 is projected below, and the grommet 1 is supported by the support rod 60. Is passed through a bolt hole provided in the grommet 1, and a nut 57 is fastened to the protruding portion of the stud bolt 55 to fix the grommet 1 to the vehicle body 50.
The position where the support rod 60 of the vehicle body 50 is protruded has no space for the operator to tighten the screw, while the position where the stud bolt 55 is protruded has the operation space for tightening the nut 57.

The grommet 1 is formed by combining a grommet body 2 formed of rubber or elastomer and a fixed plate 10 made of a metal plate.
The grommet body 2 protrudes in the outer diameter direction from the small diameter cylindrical portion 3 through which the wire harness is inserted, the large diameter cylindrical portion 4 continuous to one end of the small diameter cylindrical portion 3, and the peripheral edge of the distal end opening of the large diameter cylindrical portion 4. And a seal lip 6 projecting along the outer peripheral edge of the flange portion 5 on the vehicle body contact side.

  A surface of the flange portion 5 opposite to the vehicle body contact side is covered with a fixing plate 10 made of a metal plate, and is fixed by fitting to be integrated. The flange portion 5 of the grommet main body 2 has a substantially rhombus shape, and the fixing plate 10 that covers the flange portion 5 has the same shape.

  The flange portion 5 and the fixing plate 10 that are integrated with each other are provided with bolt holes 8 through which stud bolts 55 are inserted in the positions inward of the seal lip 6 in the vicinity of the upper apex thereof.

The lower portion of the flange portion 5 and the fixing plate 10 has an arc shape, and a pair of notches 9 are provided on both sides of the center portion, and the lower end center between the notches 9 protrudes outward and then refracts downward. A downward L-shaped projection 11 is provided. Both sides of the downward L-shaped projection 11 become openings 11a and 11b, and have a cross-sectional shape shown in FIG. The portions located through the notches 9 on both sides of the downward L-shaped projection 11 are set as support rod pressing portions 13A and 13B.
The seal lip 6 on the opposite side of the vehicle body is located on the inner peripheral side of the downward L-shaped projection 11.

  As shown in FIG. 3, a stud bolt 55 projects from the vehicle body 50 toward the engine room side above the through hole 51. A pair of metal brackets 59 is fixed below the through hole 51, and the support rod 60 is bridged between the metal brackets 59. As shown in FIGS. 2B and 2C, the support bar 60 is longer than the width of the grommet 1 at a position corresponding to the support bar 60. Further, the support bar 60 is passed through the downward L-shaped projection 11 of the grommet 1, and the support bar 60 is positioned on the outer surface side of the support bar pressing portions 13A and 13B on both sides of the downward L-shaped projection 11. .

  Next, the grommet 1 is attached to the wire harness W / H, the wire harness W / H is routed through the vehicle and passed through the through hole 51 of the vehicle body 50, and the grommet 1 is closed so as to close the through hole 51. The operation of fixing to 50 will be described.

  First, the grommet 1 is laminated and integrated by fitting a fixing plate 10 to the flange portion 5 of the grommet body 2. The wire harness W / H is penetrated while the small diameter cylindrical portion 3 of the grommet main body 2 of the grommet 1 is expanded with an expansion jig (not shown). After the penetration, the adhesive tape T is wound around the tip of the small diameter cylindrical portion 3 and the wire harness W / H, and the grommet 1 is fixed to the wire harness W / H.

  The wire harness W / H attached with the grommet 1 as described above is routed in the automobile, and the wire harness W / H is passed through the through hole 51 of the vehicle body 50 from the engine room side. When the grommet 1 is close to the through hole 51, as shown in FIG. 4, the downward L-shaped projection 11 at the center of the lower end of the grommet 1 is placed on the center of the support rod 60, while the support rod pushes on both sides of the downward L-shaped projection 11 Both sides of the support bar 60 are positioned on the outer surfaces of the contact portions 13A and 13B. Thus, with the lower end of the grommet 1 being rotatably supported by the support rod 60, the upper end of the grommet 1 is rotated toward the vehicle body 50 so that the bolt hole 8 at the upper center of the grommet 1 is inserted into the stud bolt 55. .

After passing the stud bolt 55 through the bolt hole 8, the nut 57 is tightened to the stud bolt 55. The grommet 1 is rotated toward the vehicle body 50 with the support rod 60 as a support shaft, and the support rod pressing portions 13A and 13B on both sides of the lower end of the grommet 1 positioned below the support rod 60 are rotated outward. It is pressed against the support bar 60 located in the direction. Therefore, the grommet 1 can be firmly fixed to the support rod 60 protruding from the vehicle body 50.
Further, the seal lip 6 protruding from the grommet main body 2 on the vehicle body abutting side is brought into contact with the vehicle body 50 by tightening with the nut 57 and is crushed, so that the water stop performance can be improved.

In the grommet vehicle body mounting structure according to the present invention, the nut cannot be tightened below the through hole 51 provided in the vehicle body 50. However, the support rod 60 projects from the vehicle body 50 and faces downward to the grommet 1. If the L-shaped protrusion 11 is provided and the support rod 60 is passed through, the nut 57 is tightened on the stud bolt 55 on the upper side where the nut tightening operation can be performed, and the downward L-shaped protrusion is formed on the support rod 60. It can be fixed by pressure contact. As a result, the lower end of the grommet can be fixed to the vehicle body without rattling.
In addition, by tightening the nut, the seal lip projecting from the grommet is crushed to the vehicle body, and sealing performance can be secured.

5A and 5B show a second embodiment.
In the grommet 1 of the second embodiment, the laminated grommet body 2 and the fixing plate 10 are provided with bolt holes 80 on both the left and right sides, and stud bolts 55 protruding from the vehicle body are also passed through these bolt holes 80, The nut 57 is tightened. The fastening of the nut to the stud bolts 80 on both the left and right sides is preferably performed after the fastening of the nut 57 to the stud bolt 55 passed through the bolt hole 8 at the upper center is finished.
As described above, when the upper part and the left and right side parts are also tightened with the nuts through the stud bolts, the pressing force can be evenly applied to the entire grommet 1.

  The present invention is not limited to the above-described embodiment, and when a wire harness that is routed below the floor is routed through a through hole provided in the floor, the wire harness may be fixed to the lower surface of the floor so as to close the through hole.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Grommet main body 3 Small diameter cylinder part 4 Expanded diameter cylinder part 5 Flange part 6 Seal lip 8 Bolt hole 10 Fixing plate 11 Downward L-shaped protrusion 13A, 13B Support rod pressing part 50 Car body 51 Through hole 55 Stud bolt 57 Nut 60 Support bar

Claims (3)

Rubber provided with a cylindrical portion through which a wire harness routed in a vehicle is inserted, a flange portion protruding in an outer diameter direction from one end of the cylindrical portion, and a seal lip projecting on the vehicle body contact side of the flange portion Or grommet body made of elastomer,
A grommet comprising a metal plate or a fixed plate made of a resin plate that covers the side opposite to the vehicle body contact side of the flange portion of the grommet body;
While providing a bolt hole in communication with the flange portion of the grommet body integrated with the laminated plate and at least the upper central portion of the fixing plate and projecting a downward L-shaped projection outward at the lower end central portion,
A stud bolt protruding from the vehicle body is passed through the bolt hole, while a support rod protruding from the vehicle body is passed through the downward L-shaped projection, and both sides of the support rod are supported on both sides of the downward L-shaped projection. Place on the outer surface side of the pressing part,
The stud bolt that has passed through the bolt hole of the grommet is tightened with a nut, and the seal lip of the grommet body is crushed against the vehicle body by rotating the grommet body and the fixing plate. A grommet body mounting structure in which this part is pressed against the support rod and fixed. Supporting and attaching both ends of the support rod to a pair of metal brackets protruding from the vehicle body,
The downward L-shaped projection provided on the grommet is provided with a pair of left and right cutouts or slits with a gap between the laminated grommet body and the fixing plate, and a central portion sandwiched between the cutouts or slits on both sides. Refracted into an L shape to form downward L-shaped projections on both sides of the opening. The downward L-shaped projections are inserted over the support rod from above, and both sides sandwiching the downward L-shaped projections of the grommet are supported rod pressing portions. The vehicle body mounting structure for a grommet according to claim 1. The grommet body and the fixed plate is a substantially rhombic shape in which the apex portion and an arc-shaped, the bolt holes provided in the corner portion of the upper central and lateral, claims that tightening the stud bolt through these bolt holes in nuts The vehicle body mounting structure for a grommet according to claim 1 or claim 2.

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