JP2013220020A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which improves the waterproofness thereby enabling attachment to a panel from the inner side and the outer side of a vehicle.SOLUTION: A grommet 1 is attached to a hole of a panel and includes: a grommet inner 3 made of a rigid resin; and a rubber grommet outer 2. The grommet outer 2 includes: a flange part 26 positioned outside the hole; a rip 22 provided over an entire periphery of the flange part 26; and multiple second ribs 24 connecting the rip 22 with the flange part 26. The grommet inner 3 includes: a small diameter part 30 positioned in the hole; and multiple locks 32 provided at an outer periphery of the small diameter part 30 and sandwiching a panel with the rip 22. Each second rib 24 is provided only at a position between the locks 32 so as to be furthest away from the locks 32.

Description

  The present invention relates to a grommet which is attached to a panel constituting a vehicle body such as an automobile and through which a wire harness is passed.

  In order to pass a wire harness through a hole provided in a panel constituting a vehicle body such as an automobile and prevent moisture (liquid) such as water from adhering to the wire harness, for example, as shown in FIG. Grommet 101 (see, for example, Patent Document 1) has been used.

  A grommet 101 shown in FIG. 6 has a grommet inner 103 made of a hard synthetic resin and a grommet outer 102 made of rubber attached to the grommet inner 103.

  The grommet inner 103 includes a small-diameter portion 130 formed in a cylindrical shape whose outer diameter is smaller than the hole 40 of the panel 4, and a flange projecting outward in the radial direction of the small-diameter portion 130 from one axial end portion of the small-diameter portion 130. Part 131 and a plurality of locks (not shown) provided on the outer periphery of the small-diameter part 130.

  The outer grommet 102 is formed in an annular shape having an outer diameter larger than that of the hole 40 of the panel 4, and a flange portion 126 provided with a groove 125 in which the flange portion 131 is fitted on the inner periphery, and the small diameter portion 130. A cylindrical tube portion 121 that is arranged on the inner side and extends from one end portion side to the other end portion side of the small diameter portion 130 and passes the wire harness on the inner side, one end portion in the axial direction of the tube portion 121 and the flange portion 126. And a lip 122 that protrudes from the surface of the flange portion 126 on the side away from the connecting portion 127 and is in close contact with the panel 4 provided over the entire circumference of the flange portion 126. .

  The grommet inner 103 described above is attached to the grommet outer 102 when the flange 131 fits into the groove 125, and constitutes the grommet 101. The grommet 101 is inserted into the hole 40 of the panel 4 from the other end portion of the cylindrical portion 121 and the small diameter portion 130 through the wire harness through the cylindrical portion 121. The panel 4 is attached to the panel 4 by sandwiching the panel 4 between a plurality of locks (not shown) and the lip 122. In addition, the lip 122 is in close contact with the panel 4 while being attached to the panel 4, and is kept watertight with the panel 4.

  Further, in order to ensure waterproofness, the grommet 101 has the flange 126 side of the grommet outer 102 positioned outside the panel 4 (outside the vehicle body), and the other end of the small diameter portion 130 of the grommet inner 103 is the inside of the panel 4. It is positioned (inside the car body). That is, in FIG. 6, the lower side of the panel 4 is the outside of the vehicle body, the upper side of the panel 4 is the inside of the vehicle body, and the grommet 101 is inserted into the hole 40 from the outside of the vehicle body toward the inside of the vehicle body. By attaching the grommet 101 to the panel 4 in such a direction, even when the high pressure washing machine injection port 5 is directed to the grommet 101 from the outside of the panel 4 and the high pressure liquid is ejected at the time of car washing or the like, the lip 122 is formed. The liquid is prevented from entering the inside of the panel 4 as shown by an arrow E in close contact with the panel 4.

Utility Model Registration No. 2562754

  However, in the conventional grommet 101 described above, the grommet outer 102 side having the flange portion 126 formed with a larger diameter than the hole 40 of the panel 4 is positioned outside the panel 4, that is, outside the vehicle body. At the time of attachment to 4, it was necessary to carry out the attachment work from the outside of the vehicle body.

  On the other hand, due to various circumstances such as it is difficult to provide a work space outside the vehicle body, the grommet can be attached only from the inside of the panel 4, that is, the vehicle body inside. In this case, as shown in FIG. 7, the flange portion 126 side of the grommet outer 102 is positioned inside the panel 4 (inside the vehicle body), and the other end portion side of the small diameter portion 130 of the grommet inner 103 is outside the panel 4 (in the vehicle body). It is conceivable that the grommet 101 is attached to the panel 4 from the inside of the vehicle body in the direction positioned on the outside. However, in such a case, when the high-pressure washing machine injection port 5 is directed from the outside of the panel 4 to the grommet 101 and a high-pressure liquid is injected, a gap is generated between the lip 122 and the panel 4 as indicated by an arrow F. However, there is a problem that the liquid enters the inside of the panel 4, which is not practical.

  As described above, the conventional grommet 101 can be attached only from the outside of the vehicle body when attached to the panel 4, and there is a problem that the working state is limited.

  Therefore, an object of this invention is to provide the grommet which can be attached to a panel from both the inner side and the outer side of a vehicle body by improving waterproofness.

  The invention described in claim 1 includes a grommet inner made of a hard synthetic resin and a grommet outer made of an elastically deformable rubber attached to the grommet inner to constitute a vehicle body. In the grommet attached to the hole provided in the panel and through which the wire harness is passed, the outer grommet is provided over the entire periphery of the flange part, an annular flange part positioned outside the hole, A plurality of reinforcements that connect a lip that is in close contact with the panel and keeps watertight between the panel, a surface of the lip that is radially outward of the flange portion, and a surface of the flange portion from which the lip protrudes. A rib, and the grommet inner is formed in a cylindrical shape having an outer diameter smaller than that of the hole and positioned inside the hole. A small-diameter portion to be attached, and a plurality of locks provided on an outer periphery of the small-diameter portion and sandwiching the panel between the lips, and the plurality of reinforcing ribs are provided only between the plurality of locks. The grommet is provided at a position farthest from the lock.

  The invention described in claim 2 is the invention described in claim 1, wherein the lock is an inclined surface positioned on the front side in the mounting direction to the panel, and a locking surface positioned on the rear side in the mounting direction. A boundary between the inclined surface and the locking surface, and in a state before being attached to the panel, the boundary is located on the rear side in the attachment direction with respect to the tip of the lip. It is what.

  According to the first and second aspects of the invention, since the plurality of reinforcing ribs are provided only between the plurality of locks, the contact pressure of the lip to the panel can be increased, and the lock Because it is provided at the position farthest from the lip, it can ensure a uniform contact pressure to the panel over the entire area of the lip, improve waterproofness, and at the same time insert this grommet when attaching to the panel The increase in force can be minimized. Therefore, not only when this grommet is inserted and installed in the panel hole from the outside to the inside of the vehicle body, but also when it is inserted and installed in the panel hole from the inside to the outside of the vehicle body Since it is possible to exhibit high waterproofness, a grommet that can be attached to the panel from both the inside and outside of the vehicle body can be provided.

It is a perspective view which shows the grommet which concerns on one embodiment of this invention. It is a top view of the grommet shown in FIG. It is sectional drawing which follows the BB line in FIG. It is sectional drawing which follows the AA line in FIG. It is sectional drawing which shows the state by which the grommet shown by FIG. 1 was attached to the panel. It is sectional drawing which shows the conventional grommet. It is sectional drawing explaining the problem of the conventional grommet shown by FIG.

  Hereinafter, a grommet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The grommet 1 of the present invention is attached to a hole 40 provided in a panel 4 (shown in FIG. 5) constituting a vehicle body such as an automobile. In the present embodiment, the hole 40 has a round planar shape.

  In FIG. 5, the upper side of the panel 4 is the inside of the vehicle body, and the lower side of the panel 4 is the outside of the vehicle body. In this specification, the surface of the panel 4 positioned inside the vehicle body is expressed as “inside surface”, and the surface of the panel 4 positioned outside the vehicle body is expressed as “outside surface”.

  In addition, the grommet 1 of the present invention protects this wire harness through a wire harness routed inside the automobile, and keeps the watertight between the panel 4 and water from the panel 4 to the inside of the vehicle body. The liquid is prevented from entering and the liquid is prevented from adhering to the wire harness.

  The grommet 1 includes a grommet inner 3 made of a hard synthetic resin and a grommet outer 2 made of elastically deformable rubber attached to the grommet inner 3 as shown in FIGS. ,have.

  The grommet inner 3 includes a small-diameter portion 30 that is formed in a cylindrical shape whose outer diameter is smaller than the hole 40 of the panel 4, and a collar that protrudes from the one end portion in the axial direction of the small-diameter portion 30 to the outer side in the radial direction of the small-diameter portion 30. The portion 31 and a plurality of locks (shown in FIG. 1) 32 provided on the outer periphery of the small diameter portion 30 are integrally provided. The plurality of locks 32 project radially outward from the outer periphery of the small diameter portion 30 and sandwich the panel 4 between the lip 22 described later. As a result, the grommet 1 is fixed to the panel 4.

  The outer grommet 2 is formed in an annular shape having an outer diameter larger than that of the hole 40 of the panel 4, and a flange portion 26 provided with a groove 25 in which the flange portion 31 is fitted on the inner periphery, and the small diameter portion 30. A cylindrical tube portion 21 that is arranged on the inner side and extends from one end portion side to the other end portion side of the small-diameter portion 30 and passes the wire harness inside, and one end portion in the axial direction of the tube portion 21 and the flange portion 26. And a lip 22 that protrudes from the surface of the flange portion 26 on the side away from the connecting portion 27 and is in close contact with the inner surface of the panel 4 provided over the entire circumference of the flange portion 26; A plurality of first ribs 23 and a plurality of second ribs 24 (corresponding to the reinforcing ribs described in the claims) are integrally provided.

  Further, the grommet inner 3 is attached to the grommet outer 2 by configuring the flange portion 31 in the groove 25 to constitute the grommet 1.

  As shown in FIGS. 2 to 4, the plurality of first ribs 23 protrude in the same direction as the lip 22 from the radially inner side of the flange portion 26 rather than the lip 22 of the flange portion 26. That is, it is provided so as to protrude toward the panel 4. The plurality of first ribs 23 extend in a curved shape along the circumferential direction of the flange portion 26, and are provided at equal intervals on the same circumference with a space therebetween. In addition, three first ribs 23 are provided in the present embodiment.

  Further, the first rib 23 is formed so as to be spaced from the inner surface of the panel 4 in a state where the panel 4 is sandwiched between the lip 22 and the lock 32, that is, to be non-contact. Yes. In other words, the first rib 23 has a tip portion away from the flange portion 26 positioned closer to the flange portion 26 than a tip portion away from the flange portion 26 of the lip 22, and the grommet 1 is attached to the panel 4. The tip of the lip 22 is formed in such a protruding amount that it does not come into contact with the inner surface of the panel 4 even when the tip of the lip 22 is crushed in close contact with the inner surface of the panel 4. Therefore, the adhesion of the lip 22 to the panel 4, that is, the contact pressure is not reduced.

  Furthermore, the lock 32 described above is positioned between the first ribs 23 adjacent to each other as shown in FIG. By providing the lock 32 at this position, it is possible to increase the contact pressure of the lip 22 on the panel 4 where the first rib 23 is not provided on the radially inner side of the flange portion 26.

  As shown in FIG. 5, the plurality of second ribs 24 connect the surface of the lip 22 closer to the outer side in the radial direction of the flange portion 26 and the surface of the flange portion 26 from which the lip 22 protrudes. The second rib 24 reinforces the bending rigidity of the lip 22, and the contact pressure of the lip 22 to the panel 4 is increased by providing the second rib 24. That is, waterproofness is improved.

  In the present embodiment, three second ribs 24 are provided at regular intervals with an interval therebetween. Further, the second ribs 24 are positioned at intermediate positions between the locks 32 adjacent to each other. That is, it is provided at a position farthest from each lock 32. As described above, the second rib 24 is not provided over the entire circumference of the flange portion 26, and is provided partially at a position farthest from each lock 32, thereby allowing the grommet 1 to the panel 4. The increase in insertion force during installation is minimized.

  That is, the bending rigidity of the lip 22 increases as the second rib 24 is provided over a wide range. However, since the lip 22 is less likely to be elastically deformed, it is inserted when the small diameter portion 30 provided with the lock 32 is press-fitted into the hole 40. The force or resistance force increases. Therefore, in the present invention, the second rib 24 is provided only at a position farthest from the lock 32 where the contact pressure of the lip 22 is lowest, so that the contact pressure to the panel 4 is uniform over the entire area of the lip 22. In addition, the increase in insertion force when the grommet 1 is attached to the panel 4 is minimized.

  When the grommet 1 having the above-described configuration is attached to the panel 4, the grommet inner 3 is previously attached to the grommet outer 2 and the grommet 1 is positioned inside the panel 4. Then, the other end portion of the tube portion 21 away from the connecting portion 27 is made to face the hole 40 of the panel 4 along the axis of the tube portion 21. Then, the grommet 1 is inserted into the hole 40 from the inner side of the panel 4 toward the outer side along the axial center of the cylindrical portion 21. Then, the tip of the lip 22 comes into contact with the inner surface of the panel 4. Further, by pushing the grommet 1 into the hole 40 of the panel 4, the lip 22 is elastically deformed so as to be crushed, and a plurality of locks 32 provided on the outer periphery of the small diameter portion 30 are passed through the hole 40. It contacts the outer surface of the panel 4. Thus, the grommet 1 is attached to the panel 4 with the lip 22 being kept watertight between the inner surface of the panel 4 and the panel 4 being sandwiched between the lip 22 and the lock 32.

  Further, as shown in FIG. 5, when the high-pressure washing machine injection port 5 is directed from the outside of the panel 4 to the above-described grommet 1 and high-pressure liquid is jetted, the hole 40 enters the inside of the panel 4, that is, the inside of the vehicle body. The momentum of the high-pressure liquid to be infiltrated is reduced by hitting the first rib 23, and also enters the inside of the panel 4, that is, the inside of the vehicle body by the lip 22 that is in close contact with the inner surface of the panel 4 with a high contact pressure. It is prevented.

  The grommet 1 described above has the other end of the small-diameter portion 30 away from the flange portion 31 with the flange portion 26 side positioned on the outside of the panel 4 (outside of the vehicle body), similarly to the conventional grommet 101 shown in FIG. Of course, it is also possible to attach the part side to the panel 4 in such a direction as to be positioned inside the panel 4 (inside the vehicle body). In this case as well, high-pressure liquid is prevented from entering the inside of the panel 4, that is, the inside of the vehicle body, by the lip 22 that is in close contact with the outer surface of the panel 4 with a high contact pressure. Even if the liquid enters between the lip 22 and the outer surface of the panel 4, the liquid is weakened by hitting the first rib 23. It becomes difficult to enter inside.

  According to the present embodiment, not only when the grommet 1 is attached by being inserted into the hole 40 of the panel 4 from the outside to the inside of the vehicle body by the first rib 23 described above, but also from the inside to the outside of the vehicle body. Therefore, the grommet 1 can be attached to the panel 4 from both the inside and outside of the vehicle body, even when it is inserted into the hole 40 of the panel 4 and attached. It is possible to solve the conventional problem that the working state is limited at the time of attachment to the camera.

  Further, according to the present embodiment, the first ribs 23 and the second ribs 24 can improve the waterproofness, so that the number of locks 32 can be reduced as compared with the conventional case.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Grommet 2 Grommet outer 3 Grommet inner 4 Panel 22 Lip 24 Second rib (Reinforcement rib)
26 Flange 30 Small Diameter 32 Lock 40 Hole

Claims (2)

A grommet inner made of hard synthetic resin and a grommet outer made of elastically deformable rubber attached to the grommet inner, and attached to a hole provided in a panel constituting the vehicle body; In the grommet that passes the wire harness inside,
The grommet outer is
An annular flange positioned on the outside of the hole;
A lip that is provided over the entire circumference of the flange portion and that is in close contact with the panel and is watertight with the panel;
A plurality of reinforcing ribs connecting the radially outer surface of the flange portion of the lip and the surface of the flange portion from which the lip protrudes;
The grommet inner is
A small-diameter portion that is formed in a cylindrical shape having an outer diameter smaller than the hole and is positioned inside the hole;
A plurality of locks provided on the outer periphery of the small-diameter portion and sandwiching the panel between the lip, and
The grommet, wherein the plurality of reinforcing ribs are provided only between the plurality of locks, and are provided at positions farthest from the locks. The lock has an inclined surface located on the front side in the mounting direction to the panel; a locking surface located on the rear side in the mounting direction; and a boundary between the inclined surface and the locking surface;
2. The grommet according to claim 1, wherein, in a state before being attached to the panel, the boundary is located behind the tip end of the lip in the attachment direction.

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