JP2018196305A - Grommet - Google Patents

Abstract

To provide a grommet that can make a vehicle interior side of a vehicle body panel waterproof in crimping and attaching the grommet to a through-hole of the vehicle body panel from outside of the vehicle interior.SOLUTION: The grommet has a flange 23 at an end part thereof, and has a hollow inner ring which has a plurality of hooks 25 to be locked to a circumferential edge of a through-hole of a vehicle body panel P provided on a surface thereof and a grommet main body that can engage with the inner ring and allows a wire harness to penetrate therethrough. The grommet main body has a cylindrical part 12 that passes through the inner ring, and a bent part 13, continuous to the cylindrical part, which engages with the inner ring by covering the flange of the inner ring, from the inside of the inner ring to the outside thereof. In an end part of the bent part of the grommet main body is formed a waterproof rib 16 opposing at an interval to the hook. When the hook is locked to the circumferential edge of the through-hole of the vehicle body panel, the end part of the bent part and the waterproof rib are sandwiched between the vehicle body panel and the flange of the inner ring, so as to rupture the waterproof rib.SELECTED DRAWING: Figure 10

Description

  The present disclosure relates to grommets.

Patent Document 1 discloses a resin provided with a grommet main body made of rubber or elastomer that allows a wire harness to be inserted in close contact therewith, and a vehicle body locking claw that is fitted in the grommet main body and is locked to the periphery of the insertion hole of the vehicle body panel. A grommet consisting of an inner ring made of steel is disclosed. The grommet has a plurality of vehicle body locking claws projecting from the distal end side in the axial direction of the inner ring at intervals in the circumferential direction, and circumferentially extending from the proximal end side in the axial direction of the inner ring in the outer diameter direction. 3 to 8 fixed claws are provided with a gap in the direction, and each fixed claw has a hook shape with a hooking projection at the tip, and the circumferential intervals of these fixed claws are all different. Yes.
On the other hand, the grommet main body is continuously provided with a small-diameter cylindrical portion and a medium-diameter cylindrical portion that allow the wire harness to be inserted in close contact with each other, and a large-diameter cylindrical portion that internally fits the inner ring from the peripheral wall of the medium-diameter cylindrical portion. Protrusively projecting in the direction facing the vehicle body panel, a plurality of through holes are provided in the peripheral wall of the large-diameter cylindrical portion, and the fixed claws are passed through the through holes. Is brought into contact with the outer peripheral surface of the large-diameter cylindrical portion.

JP 2011-61930 A

  The present disclosure provides a grommet capable of waterproofing the vehicle compartment side of the vehicle body panel when the grommet is attached to the through hole of the vehicle body panel from outside the vehicle compartment.

  A grommet according to the present disclosure includes a hollow inner ring having a hook at an end portion and a plurality of hooks provided on a surface of the through hole of the vehicle body panel. The grommet is engaged with the inner ring and is a wire. A grommet body through which a harness can be inserted, and the grommet body is continuous with the cylindrical portion passing through the inner ring, and is continuous with the cylindrical portion and extends from the inner side to the outer side of the inner ring. A curved portion that engages with the inner ring by covering at least a part of the flange, and a waterproof rib that is opposed to the hook at a distance from the end of the curved portion of the grommet body. Formed when the hook is locked to the periphery of the through hole of the vehicle body panel, between the vehicle body panel and the flange of the inner ring. Serial and the waterproof rib and the end portion of the curved portion is sandwiched, are formed the so waterproof rib is crushed.

  The grommet in the present disclosure is configured such that the curved portion and the waterproof rib are crushed between the collar of the vehicle body panel and the inner ring when the hook is locked to the periphery of the through hole of the vehicle body panel. For this reason, the curved portion and the waterproof rib are crushed and deformed, so that there is no space for water to enter the periphery of the through hole, so that water can be prevented from entering from the outside of the body panel to the inside of the body panel, The vehicle compartment side of the vehicle body panel can be waterproofed. Further, since the end of the curved portion and the waterproof rib are firmly sandwiched between the vehicle body panel and the collar of the inner ring, it is possible to prevent the engagement of the curved portion of the inner ring from the collar.

It is a perspective view of the grommet concerning this embodiment. It is a perspective view at the time of seeing from another viewpoint of the grommet concerning this embodiment. It is a perspective view of the inner ring which concerns on this embodiment. It is a top view of the inner ring which concerns on this embodiment. FIG. 5 is a cross-sectional view taken along the line A-A ′ of FIG. 4. It is an enlarged view of area | region R1 of FIG. It is a perspective view of the grommet body concerning this embodiment. It is sectional drawing of the grommet main body which concerns on this embodiment. It is an enlarged view of area | region R2 of FIG. It is sectional drawing at the time of latching the grommet which concerns on this embodiment to the through-hole periphery of a vehicle body panel.

  Hereinafter, embodiments will be described with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[Embodiment]
[1-1. Task]
Hereinafter, the problem of this embodiment will be described. Conventionally, when a wire harness to be routed in an automobile is inserted into a through-hole of a vehicle body panel, a grommet with the wire harness inserted therein is fitted and assembled into the through-hole of the vehicle body panel, and the wire at the insertion portion of the through-hole The harness is protected and waterproof.

  Patent Document 1 discloses a grommet with a resin inner structure in which a fixed claw projecting from a peripheral wall of a resin inner is passed through and fitted into a plurality of through holes provided on a peripheral wall of a large-diameter cylindrical portion of a grommet body. .

  By the way, in the grommet disclosed in Patent Document 1, in order to fit the grommet main body and the resin inner, the plurality of through holes provided in the peripheral wall of the large-diameter cylindrical portion of the grommet main body protrude from the peripheral wall of the resin inner. It was necessary to fit the fixed pawls installed, and workability was poor. In addition, since a plurality of through holes or a plurality of fixing claws of the grommet body and the resin inner are provided on the peripheral wall, there is a problem that the manufacturing cost is increased.

  In response to this problem, there is an attempt to fit a grommet with a resin inner without providing a fixing claw protruding from a through hole or a resin inner peripheral wall on the peripheral wall of the grommet body. According to this trial, there is no plurality of through-holes for fitting the grommet main body and the resin inner to each other, and there are no plurality of protruding fixed claws, so that the fitting operation can be easily performed. Further, since there is no through hole in the grommet body and no fixing claw for the resin inner, the manufacturing cost can be reduced.

  However, in this trial as well, when the assembly work method to the through hole of the vehicle body panel can only be attached from the outside of the passenger compartment, the grommet is attached to the through hole of the vehicle body panel by pressing from the outside of the passenger compartment, so that it is completely fitted. It is difficult to ensure waterproofing inside the vehicle body panel without knowing whether it is in a state. Furthermore, if it is intended to ensure the waterproofing of the inside of the vehicle body panel, it is difficult to perform the mounting operation when crimping to the through hole of the vehicle body panel.

  The present embodiment has been made in view of such circumstances, and can easily fit the grommet body and the inner ring inner ring, and attach the grommet to the through hole of the vehicle body panel from the outside of the passenger compartment. In some cases, a grommet capable of waterproofing the vehicle body side of the vehicle body panel and improving the assembly workability to a desired vehicle body panel is provided.

  Hereinafter, this embodiment will be described with reference to FIGS.

[1-2. Constitution]
[1-2-1. Grommet configuration]
The grommet according to the present embodiment is a configuration in which the inner ring is combined with the grommet body, the wire harness routed in the automobile is inserted into the grommet, and the grommet is fitted and assembled to the through hole provided in the vehicle body panel. The inner ring holding force by the grommet body is increased, and waterproofness, low insertion force into the through hole of the vehicle body panel, and high removal force are realized.

  FIG. 1 is a perspective view of the grommet according to the present embodiment. FIG. 2 is a perspective view when viewed from another viewpoint of the grommet according to the present embodiment. As shown in FIGS. 1 and 2, the grommet 1 includes a hollow inner ring 21 and a grommet main body 11 that engages with a flange 23 of the inner ring 21 and can be inserted through a wire harness. The inner ring 21 is made of resin, for example, while the grommet body 11 is an elastic body as an example.

[1-2-2. Inner ring configuration]
FIG. 3 is a perspective view of the inner ring according to the present embodiment. FIG. 4 is a plan view of the inner ring according to the present embodiment. 5 is a cross-sectional view taken along line AA ′ of FIG. FIG. 6 is an enlarged view of a region R1 in FIG.

  As shown in FIG. 3, the inner ring 21 is provided with a plurality of hooks (here, two hooks 25 as an example) that are engaged with the periphery of the through hole of the vehicle body panel. As shown in FIG. 3, the inner ring 21 includes a flange 23 provided at an end portion and a hollow cylindrical portion 29 continuous with the flange 23. The flange 23 and the cylindrical portion 29 are continuously integrated.

  Flat portions 24 are formed at two locations of the cylindrical portion 29, and the flat portions 24 are formed so as to face each other. In other words, the cylindrical portion 29 is partially cut (here, as an example, H-cut) to form the opposed flat portions 24, and the flat portions 24 are each formed with a hook 25. With this configuration, the operator can firmly grasp the flat surface portion 24, so that the attachment of the grommet 1 to the vehicle body panel P is improved. At the same time, the shape of the hook 25 can be stably formed.

  The hook 25 according to the present embodiment is a snap fit that is locked using the elasticity of the material of the hook 25. With this configuration, since a clicking sound is generated when the hook 25 is fixed to the vehicle body panel P, it is possible to easily check the assembly.

  The flat surface portion 24 is continuously and integrally formed up to a portion of the flat portion 25a of the hook 25 (here, snap fit). Thereby, since the thickness of the flat part 25a can be made uniform, the shape of a snap fit can be shape | molded stably and the desired mechanical characteristic of a snap fit can be ensured.

  The outermost contour P <b> 1 of the hook 25 is provided on a concentric circle 28 centering on the central axis 26 of the cylindrical portion 29 of the inner ring 21. The diameter of this concentric circle 28 is larger than the diameter of the through-hole H of the vehicle body panel P as an example.

  Further, as shown in FIGS. 3 and 5, the hook 25 moves toward the inner side of the inner ring 21 (see FIGS. (See FIG. 6) at a first angle θ1 (see FIG. 6). With this configuration, since an inclination is provided, insertion is possible with a low insertion force when inserted into the through hole of the vehicle body panel and locked to the periphery of the through hole.

  As shown in FIGS. 3 and 5, as approaching the flange 23 of the inner ring 21 with the outermost contour of the hook 25 as a boundary, the inner angle of the inner ring 21 (see FIGS. 4 and 5) is more than the first angle θ 1. It is inclined at a large second angle θ2 (see FIG. 6). Since a large inclination is provided by this configuration, a large force is required to remove the inner ring 21 from the vehicle body panel after the inner ring 21 is locked to the periphery of the through hole on the vehicle body panel.

  The inner ring 21 can be assembled by pressing the inner ring 21 against the vehicle body panel P by providing the hook 25 on the flat surface portion 24, and is fixed to the vehicle body panel with desired mechanical characteristics.

[1-2-3. Grommet configuration]
Next, the grommet body 11 according to this embodiment will be described. FIG. 7 is a perspective view of the grommet body according to the present embodiment. FIG. 8 is a cross-sectional view of the grommet body according to the present embodiment. FIG. 9 is an enlarged view of a region R2 in FIG. As shown in FIGS. 7 and 8, the grommet body 11 includes a cylindrical portion 12 passing through the inside of the inner ring 21, and a flange 23 of the inner ring 21 that is continuous with the cylindrical portion 12 and extends from the inside to the outside of the inner ring 21. And a curved portion 13 that engages with the inner ring 21 by covering at least a part thereof. For example, the cylindrical portion 12 and the bending portion 13 are formed continuously and integrally. As shown in FIG. 8, the grommet body 11 is axisymmetric with respect to the axis 18.

  As shown in FIGS. 7 and 8, an opening 14 is provided around the cylindrical portion 12. As shown in FIGS. 7 and 8, waterproof ribs 16 are provided on the curved portion 13 in a convex shape in the circumferential direction. As described above, the waterproof rib 16 is formed at the end of the curved portion 13 so as to face the hook 25 of the inner ring 21 with an interval. As shown in FIG. 8, the cross-sectional shape of the waterproof rib 16 forms a substantially triangular shape.

  The waterproof rib 16 is inclined toward the bottom surface of the grommet body 11 from the outer peripheral side to the inner peripheral side. As a result, when the hook is locked to the periphery of the through hole of the vehicle body panel, the outer peripheral side of the waterproof rib 16 is crushed more than the inner peripheral side, thus reliably preventing water from entering from the outer peripheral side to the inner peripheral side. can do.

  A hollow space 15 is formed in the grommet body 11 by the bending of the bending portion 13. Thereby, the inner ring 21 can be fitted in the hollow space 15. The thickness d4 (see FIG. 9) of the hollow space 15 is smaller than the thickness d5 (see FIG. 6) of the flange 23 of the inner ring 21. Thereby, since the stress acts on the flange 23 by fitting the flange 23 in the hollow space 15 of the curved portion 13, the curved portion 13 of the grommet body 11 can be firmly fixed to the flange 23.

  The cylindrical portion 12 is provided with a hole 19, and the wire harness can be inserted into the cylindrical portion 12 by passing the wire harness through the hole 19.

  As shown in FIGS. 7 and 8, since the grommet body 11 is provided with the opening 14 and the hollow space 15, the inner ring 21 can be easily assembled. When the waterproof rib 16 is assembled to the vehicle body panel P, the contact area with the vehicle body panel P is small, so that the reaction force from the vehicle body panel P is small and the assembly work can be easily performed. In order to ensure the desired workability, the thickness d2 (see FIG. 9) of the end portion of the curved portion 13 and the thickness d3 (see FIG. 9) of the waterproof rib need only be set to desired dimensions. be able to.

  On the other hand, when the grommet body 11 is in close contact with and fixed to the vehicle body panel P, the reaction force from the vehicle body panel P also increases.

FIG. 10 is a cross-sectional view when the grommet according to the present embodiment is locked to the periphery of the through hole of the vehicle body panel. As shown in FIG. 10, the wire harness 30 passes through the hole 19 formed in the grommet body 11, and since the diameter of the wire harness 30 is larger than the diameter of the hole 19, the hole 19 is blocked.
As shown in FIG. 10, when the hook 25 is locked to the periphery of the through hole of the vehicle body panel P, the engagement portion P <b> 2 (see FIG. 6) of the hook 25 and the flange 23 form the vehicle body panel P and the bending portion 13. The end portion and the waterproof rib 16 are sandwiched. Here, the engaging portion P2 of the hook 25 is a portion with which the vehicle body panel P is engaged.

  In order to ensure the waterproof function, as shown in FIG. 10, when the hook 25 is locked to the periphery of the through hole of the vehicle body panel P, the bending portion 13 is interposed between the vehicle body panel P and the flange 23 of the inner ring 21. The end portion and the waterproof rib 16 are sandwiched so that the waterproof rib 16 is crushed.

  With this configuration, when the waterproof rib 16 is crushed and deformed, an area where the waterproof rib 16 and the vehicle body panel P are in close contact with each other is increased, and water can be prevented from entering between the waterproof rib 16 and the vehicle body panel P. . For this reason, it is possible to prevent water from entering from the outside of the vehicle body panel P to the inside of the vehicle body panel P, and the vehicle compartment side of the vehicle body panel P can be waterproofed. Furthermore, since the end of the curved portion 13 and the waterproof rib 16 are firmly sandwiched between the vehicle body panel P and the flange 23 of the inner ring 21, the engagement of the curved portion 13 of the inner ring 21 with the flange 23 is released. Can be prevented.

  Next, the conditions under which the waterproof rib 16 is crushed when the hook 25 is locked to the periphery of the through hole of the vehicle body panel P will be described. The length L in FIG. 6 is the length from the engaging portion P <b> 2 of the hook 25 to the flange 23 of the inner ring 21. As a condition for the waterproof rib 16 to be crushed, the length L includes the thickness d1 of the vehicle body panel P (see FIG. 10), the thickness d2 of the end portion of the curved portion 13 (see FIG. 9), and the thickness d3 of the waterproof rib (see FIG. 9). Less than the sum S (L <S = d1 + d2 + d3).

  With this configuration, when the hook 25 is locked to the periphery of the through hole of the vehicle body panel P, the end portion of the curved portion 13 and the waterproof rib 16 are sandwiched between the vehicle body panel P and the flange 23 of the inner ring 21. The waterproof rib 16 is crushed. With this configuration, when the waterproof rib 16 is crushed and deformed, an area where the waterproof rib 16 and the vehicle body panel P are in close contact with each other is increased, and water can be prevented from entering between the waterproof rib 16 and the vehicle body panel P. . For this reason, it is possible to prevent water from entering from the outside of the vehicle body panel P to the inside of the vehicle body panel P, and the vehicle compartment side of the vehicle body panel P can be waterproofed. Further, as described above, since the end portion of the curved portion 13 and the waterproof rib 16 are firmly sandwiched between the vehicle body panel P and the flange 23 of the inner ring 21, the engagement of the curved portion 13 of the inner ring 21 with the flange 23. It is possible to prevent the mismatch.

[1-3. Operation]
The attachment of the grommet configured as described above will be described below with reference to FIG.
The grommet 1 is attached by pressing against the through hole H of the vehicle body panel P. Specifically, when the inner ring 21 is fixed to the vehicle body panel P, the diameter of the concentric circle 28 in contact with the outermost wall of the hook 25 is larger than the diameter of the through hole H of the vehicle body panel P. When attached to P, the hook 25, which is a snap fit, bends. Thereafter, when the outermost shell of the hook 25 passes through the through hole H, the deflection of the hook 25 is restored, and a click sound is generated when the inner ring 21 is fixed to the vehicle body panel P. Thereby, since the worker can confirm the attachment by clicking sound, the confirmation of the attachment becomes easy. Thus, the hook 25 is mechanically fixed by fitting the hook 25 into the through hole of the vehicle body panel P using the elasticity of the material and hooking it.

  At this time, as shown in FIG. 10, the end portion of the curved portion 13 and the waterproof rib 16 are sandwiched between the vehicle body panel P and the flange 23 of the inner ring 21, and the waterproof rib 16 is crushed and deformed. The area where the vehicle body panel P and the waterproof rib 16 are in close contact with each other increases. For this reason, it is possible to prevent water from entering from between the waterproof rib 16 and the vehicle body panel P.

[1-4. Effect]
As described above, according to the present embodiment, when the hook 25 is locked to the periphery of the through hole of the vehicle body panel P, the end portion of the curved portion 13 and the waterproof portion between the vehicle body panel P and the flange 23 of the inner ring 21 are waterproof. The ribs 16 are sandwiched so that the waterproof ribs 16 are crushed. With this configuration, when the waterproof rib 16 is crushed and deformed, an area where the waterproof rib 16 and the vehicle body panel P are in close contact with each other is increased, and water can be prevented from entering between the waterproof rib 16 and the vehicle body panel P. . For this reason, it is possible to prevent water from entering from the outside of the vehicle body panel P to the inside of the vehicle body panel P, and the vehicle compartment side of the vehicle body panel P can be waterproofed. Furthermore, since the end of the curved portion 13 and the waterproof rib 16 are firmly sandwiched between the vehicle body panel P and the flange 23 of the inner ring 21, the engagement of the curved portion 13 of the inner ring 21 with the flange 23 is released. Can be prevented.

  The hook 25 is a snap fit that is locked using the elasticity of the material of the hook 25. With this configuration, it is possible to perform attachment work to the through hole of the vehicle body panel from the outside of the passenger compartment, and it is possible to determine the fitting state of the vehicle body panel P to the through hole by clicking sound.

  The inner ring 21 has a hollow cylindrical portion 29 connected to the flange 23, and the cylindrical portion 29 has a flat portion 24 that is opposed by being partially cut (here, H cut). The hooks 25 are formed on each of the plane portions 24. With this configuration, the operator can firmly hold the flat portion 24, so that the attachment of the grommet 1 to the vehicle body panel P can be improved and the moldability of the inner ring 21 can be maintained stably.

  Further, since the wire harness 30 is not only attached by being pulled to the vehicle body panel P but also attached by being pressed, it can be easily attached even in a vehicle shape in which there is no installation work space inside the vehicle body panel P.

  As described above, according to the present embodiment, the fitting operation between the grommet main body 11 and the inner ring 21 is facilitated, and the vehicle body panel P is attached to the through hole of the vehicle body panel from the outside of the vehicle compartment while ensuring the waterproofing inside the vehicle body panel P. The work can be performed and the fitting state of the vehicle body panel into the through hole of the vehicle body panel can be determined by clicking sound, and the workability of assembling to the vehicle body panel P can be improved.

[Other Embodiments]
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, and the like have been performed.

Accordingly, other embodiments will be exemplified below.
Although this embodiment has been described as having two hooks 25, the present invention is not limited to this, and three or more hooks 25 may be provided. In the present embodiment, when the hook 25 is locked to the periphery of the through hole of the vehicle body panel P, both the end of the bending portion 13 and the waterproof rib 16 are crushed. You may be comprised so that at least 1 may be crushed among the edge part of the part 13, and the waterproofing rib 16. FIG.

  In the present embodiment, the grommet main body 11 is described as an elastic body. However, the present invention is not limited thereto, and only the waterproof rib 16 may be an elastic body. Thus, it is sufficient that at least the waterproof rib 16 is an elastic body. With this configuration, when the waterproof rib 16 is crushed and deformed, an area where the waterproof rib 16 and the vehicle body panel P are in close contact with each other is increased, and water can be prevented from entering between the waterproof rib 16 and the vehicle body panel P. . For this reason, it is possible to prevent water from entering from the outside of the vehicle body panel P to the inside of the vehicle body panel P, and the vehicle compartment side of the vehicle body panel P can be waterproofed.

DESCRIPTION OF SYMBOLS 1 Grommet 11 Grommet main body 12 Cylindrical part 13 Curved part 14 Opening part 15 Hollow space 16 Waterproof rib 18 Shaft 19 Hole 21 Inner ring 23 鍔 24 Flat part 25 Hook 25a Flat part 26 Central axis 28 Concentric circle 29 Cylindrical part 30 Wire harness P Car body panel

Claims (9)

A hollow inner ring having a plurality of hooks provided on the surface, having hooks at the ends and engaging with the periphery of the through hole of the vehicle body panel;
A grommet body that engages with the inner ring and is capable of inserting a wire harness;
With
The grommet body includes a cylindrical portion passing through the inside of the inner ring, and is continuous with the cylindrical portion and covers at least a part of the flange of the inner ring from the inner side to the outer side of the inner ring. A curved portion that engages with
A waterproof rib is formed at the end of the curved portion of the grommet body to be opposed to the hook with a gap therebetween,
When the hook is locked to the periphery of the through hole of the vehicle body panel, the end of the curved portion and the waterproof rib are sandwiched between the vehicle body panel and the flange of the inner ring, and the waterproof rib Grommet that is configured to collapse. The length from the engaging portion of the hook to the flange of the inner ring is smaller than the sum of the thickness of the vehicle body panel, the thickness of the end portion of the curved portion, and the thickness of the waterproof rib. Grommet. The grommet according to claim 1, wherein the waterproof rib is inclined toward the bottom surface of the grommet body from the outer peripheral side to the inner peripheral side. The grommet according to any one of claims 1 to 3, wherein the hook is a snap fit that is locked using elasticity of a material of the hook. The hook is inclined at a first angle toward the inner side of the inner ring as it moves away from the heel of the inner ring with the outermost wall of the hook as a boundary,
The hook is inclined at a second angle larger than the first angle toward the inside of the inner ring as it approaches the ridge of the inner ring with the outermost wall of the hook as a boundary. The grommet as described in any one of 1-4. The inner ring has a hollow cylindrical portion continuous with the flange,
The grommet according to any one of claims 1 to 5, wherein the cylindrical portion is formed with a flat portion that is opposed by being partially cut, and the hook is formed on each of the flat portions. The grommet according to any one of claims 1 to 6, wherein a diameter of a concentric circle in contact with an outermost shell of the hook is larger than a diameter of a through hole of the vehicle body panel. The grommet according to any one of claims 1 to 7, wherein a thickness of a hollow space formed by the bending of the bending portion is smaller than a thickness of the flange of the inner ring. The grommet according to any one of claims 1 to 8, wherein the inner ring is made of resin.