JP2016213096A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can absorb an installation error without reducing sealability.SOLUTION: A grommet 1 is formed integrally with an elastic material and comprises a grommet main body 2, a lip connection 3 and a lip unit 4. The grommet main body 2 is a tube form having an annular engaging groove 6 in the periphery. The lip connection 3 has a cylindrical unit 9 extending to one direction crossing with a direction from near a tube hole part 5 of the grommet main body 2 to a diameter direction of the tube hole part 5, a bend part 10 turned around from all tip lap of the cylindrical unit 9 into the inside of the diameter direction, and an inner cylindrical unit 11 extending from the all tip lap of the bend part 10 to another direction and inserting inside of the cylindrical unit 9. The lip unit 4 projects annularly from the internal perimeter surface of the tip 11a of the inner cylindrical unit 11 to the inside of the diameter direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a grommet used when a linear member such as piping or wiring is inserted through a through hole of a plate-like member.

  Patent Document 1 describes a grommet in which a first collar part and a second collar part extend in a substantially disc shape from the outer surface of a cylindrical part. An annular lip portion is formed at the end of the tubular portion on the first flange side, and in the assembled state, the lip portion is in close contact with the outer surface of the pipe for sealing. Further, a state is shown in which an annular lip portion is formed at the tip that extends radially outward from the tubular portion, is folded back into a U shape, and extends radially inward.

JP 2004-34775 A

  In the grommet described in Patent Document 1, misalignment occurs between the grommet and the pipe (linear member) in the radial direction of the tubular portion due to an assembly error, and the linear member is displaced from the design position with respect to the tubular portion. Even in the case of tilting, the assembly error is absorbed by the lip portion being displaced in the radial direction with respect to the cylindrical portion.

  However, the portion connecting the tubular portion and the annular lip portion (lip connecting portion) extends radially outward from the tubular portion, is folded back into a U shape and extends radially inward, The lip connecting portion cannot sufficiently follow the increase in the inclination of the linear member, and the sealing performance between the lip portion and the linear member may be reduced.

  Then, this invention aims at provision of the grommet which can absorb an assembly | attachment error, without reducing a sealing performance.

  In order to achieve the above object, a first aspect of the present invention is a grommet that is integrally formed of an elastic material, and includes a grommet body, a lip connecting portion, and a lip portion.

  The grommet body has a cylindrical shape having an annular engagement groove on the outer periphery. The lip connection part has an outer cylinder part, a bent part, and an inner cylinder part. The outer cylinder portion extends from the vicinity of the cylindrical hole portion of the grommet body in one direction intersecting with the radial direction of the cylindrical hole portion. The bent portion is folded back radially inward from the entire circumference of the tip of the outer cylinder portion. The inner cylinder part extends in the other direction from the entire periphery of the tip of the bent part and passes through the inner side of the outer cylinder part. The lip portion has an annular shape that protrudes radially inward from the inner peripheral surface of the tip portion of the inner cylinder portion.

  In the above configuration, the linear member (for example, the refrigerant pipe) is inserted into the inner cylinder portion of the lip connection portion, and the engagement groove portion is engaged with the peripheral edge portion of the through hole of the plate member so that the grommet is the plate member. And a linear member. In such a grommet mounting state, the linear member inserted through the through hole is elastically supported by the plate-like member via the grommet. Further, the lip portion is in close contact with the linear member, and the engagement groove portion is in close contact with the peripheral portion of the through hole, whereby the space between the linear member and the through hole is sealed.

  When the radial error occurs between the grommet and the linear member due to the assembly error, and the linear member is tilted from the design position with respect to the grommet, the assembly error is caused by the lip connection portion in the radial direction with respect to the grommet body. It is absorbed by displacement.

  Further, the lip connecting portion includes an outer cylinder portion extending in one direction intersecting with the radial direction from the vicinity of the cylindrical hole portion, a bent portion that is turned back inward in the radial direction from the entire tip of the outer cylinder portion, and a tip of the bent portion Since it has an inner cylinder part that extends in the other direction from the entire circumference and passes through the inside of the outer cylinder part, it has a shape characteristic that is highly flexible in the radial direction, and easily deforms following the increase in the inclination of the linear member.

  Therefore, it is possible to absorb the assembly error without deteriorating the sealing performance.

  The 2nd mode of the present invention is the grommet of the 1st mode, and a tip part of an inner cylinder part protrudes in the other direction from a cylinder hole.

  In the said structure, since the front-end | tip part of the inner cylinder part of a lip connection part protrudes in another direction from a cylinder hole part, the full length of an inner cylinder part is formed long. For this reason, it can be set as the lip connection part of the shape characteristic further higher in the radial direction, and the follow-up performance of the lip connection part against the increase in the inclination of the linear member can be enhanced.

  Also, an operator who installs the grommet attaches the grommet to a predetermined position of the linear member, and then inserts the inner cylinder part of the grommet protruding from the cylindrical hole part into the through hole from one surface side of the plate-like member, The inner cylinder part is grasped from the other surface side of the plate-like member together with the linear member inserted through the inner cylinder part, and the inner cylinder part is pulled in a state where the movement of the plate-like member is restricted. By pulling the inner cylinder portion, the other end portion of the grommet body enters the through hole while being elastically deformed, and the engagement groove portion engages with the peripheral portion of the through hole. Thus, since the grommet can be mounted by grasping and pulling the inner cylinder portion of the grommet together with the linear member, the grommet mounting workability is improved.

  A third aspect of the present invention is the grommet according to the first or second aspect, wherein the end face in the other direction of the grommet body is an inclined surface that is inclined in one direction toward the outside in the radial direction.

  In the above configuration, since the end of the grommet body in the other direction can easily enter the through hole due to the inclined surface, the grommet mounting workability is further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the grommet which can absorb an assembly | attachment error can be provided, without reducing sealing performance.

It is a perspective view of the grommet concerning one embodiment of the present invention. It is sectional drawing explaining the attachment method which attaches the grommet of FIG. 1 to a grommet attachment hole, (a) shows the grommet before attachment, (b) shows the grommet after attachment, respectively. It is sectional drawing which shows the state which the external force which cross | intersects an insertion direction acted on the linear member which penetrates the grommet of FIG. 1 with which the grommet attachment hole was mounted | worn. It is sectional drawing which shows the state which the external force along the penetration direction acted on the linear member which penetrates the grommet of FIG. 1 with which the grommet attachment hole was mounted | worn.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the vehicle body (for example, the ceiling of the cab) partitions the first space (for example, the upper vehicle exterior space) 20 and the second space (for example, the lower vehicle interior space) 21. A vehicle body panel (for example, a ceiling panel) 22 is fixed. The vehicle body panel 22 is formed with a communication hole 23 that communicates the first space 20 and the second space 21, and a bracket (plate member) 24 is fixed to the vehicle body panel 22 so as to cover the communication hole 23. . The bracket 24 is a flat metal plate, and a circular grommet mounting hole (through hole) 25 is formed at the approximate center thereof. When arranging a linear member 26 such as a pipe such as a refrigerant pipe or an electric wire such as a wire harness from one of the first and second spaces 20 and 21 to the other, the grommet 1 is attached to the outer periphery of the linear member 26. The linear member 26 is inserted into the grommet mounting hole 25 and the grommet 1 is fitted into the grommet mounting hole 25.

  The grommet 1 includes a grommet body 2, a lip connection portion 3, and a lip portion 4, and the whole is integrally formed of an elastic material (for example, synthetic rubber).

  The grommet body 2 has a thick and short cylindrical shape, and defines a cylindrical hole portion 5 on the inner side. In the following, the radial direction of the cylindrical hole portion 5 (the left-right direction in FIG. 2) is simply the radial direction, the radial inner side of the cylindrical hole portion 5 is simply the radial inner side, and the radial outer side of the cylindrical hole portion 5 is. They are simply referred to as radially outer sides, respectively. Further, the direction (vertical direction in FIG. 2) substantially orthogonal to the radial direction of the cylindrical hole portion 5 is the axial direction, and one direction substantially orthogonal to the grommet radial direction and the other direction are axial one side (downward in FIG. 2). ) And the other side in the axial direction (upper side in FIG. 2).

  An annular engagement groove 6 is formed on the outer peripheral surface of the grommet body 2, and one side in the axial direction of the engagement groove 6 is a hook-like shape extending radially outward from the outer peripheral edge on one side in the axial direction of the grommet body 2. It is partitioned by the flange portion 7. An annular inclined surface 8 is formed on the outer periphery of the grommet body 2 on the other side in the axial direction (the outer periphery on the other side in the axial direction with respect to the engaging groove portion 6).

  The lip connection part 3 includes an outer cylinder part 9, a bent part 10, and an inner cylinder part 11. The outer tube portion 9 has a cylindrical shape extending from the vicinity of the tube hole portion 5 of the grommet main body 2 (in the present embodiment, the tip peripheral edge on the one side in the axial direction of the tube hole portion 5) to the one side in the axial direction. The bent portion 10 is a U-shaped cross section that is turned back radially inward from the entire circumference of the tip of the outer cylinder portion 9 (the entire circumference of the edge on one side in the axial direction). The inner cylinder part 11 has a cylindrical shape extending from the entire circumference of the tip of the bent part 10 (the entire circumference of the radially inner edge) to the other side in the axial direction, and is inserted through the inner side of the outer cylinder part 9. The inner cylinder part 11 is thinner and longer than the grommet main body 2 and is longer and smaller in diameter than the outer cylinder part 9, and the distal end part (the distal end part on the other side in the axial direction) 11a of the inner cylinder part 11 is a cylindrical hole. It protrudes from the part 5 to the other side in the axial direction.

  The grommet 1 is attached to the outer periphery of the linear member 26 by inserting the linear member 26 through the inner diameter portion of the inner cylinder portion 11.

  The lip portion 4 protrudes in an annular shape radially inward from the inner peripheral surface of the distal end portion 11a on the other radial side of the inner cylinder portion 11 of the lip connection portion 3. The inner diameter of the lip portion 4 is formed slightly smaller than the outer diameter of the linear member 26, and is in close contact with the outer peripheral surface of the linear member 26 that passes through the inner cylinder portion 11 over the entire circumference.

  Next, a method for attaching the grommet 1 will be described.

  As shown in FIG. 2A, the operator inserts the linear member 26 into the inner cylinder portion 11 of the grommet 1 and attaches the grommet 1 to a predetermined position of the linear member 26.

  Next, the linear member 26 is inserted into the grommet mounting hole 25 from one side of the bracket 24 (the lower side in FIG. 2). At this time, the grommet 1 is attached to the linear member 26 so that the other axial side of the grommet 1 is the front side in the insertion direction of the linear member 26 (the upper side in FIG. 2).

  Next, the inner cylinder part 11 of the grommet 1 protruding from the cylinder hole part 5 is inserted into the grommet mounting hole 25 from one surface side of the bracket 24, and the inner cylinder part together with the linear member 26 that passes through the inner cylinder part 11 of the grommet 1. 11 is gripped from the other surface side of the bracket 24 (upper side in FIG. 2), and the inner cylinder portion 11 is pulled in a state where the movement of the bracket 24 is restricted. By pulling the inner cylinder portion 11, the inclined surface 8 (end portion on the other side in the axial direction) of the grommet body 2 enters the grommet mounting hole 25 while being elastically deformed, and the engaging groove portion 6 is a peripheral portion of the grommet mounting hole 25. The grommet 1 is attached to the bracket 24 as shown in FIG. In such a grommet mounting state, the linear member 26 inserted through the grommet mounting hole 25 is elastically supported by the bracket 24 via the grommet 1. Further, the lip portion 4 is in close contact with the linear member 26, the engaging groove portion 6 and the flange portion 7 are in close contact with the peripheral portion of the grommet mounting hole 25, and the space between the linear member 26 and the grommet mounting hole 25 is sealed. The

  The bracket 24 may be fixed to the vehicle body panel 22 after the grommet 1 is attached, or may be fixed to the vehicle body panel 22 before the grommet 1 is attached.

  According to the grommet 1 of the present embodiment, when a radial position shift occurs between the grommet 1 and the linear member 26 due to an assembly error, and the linear member 26 is inclined with respect to the grommet 1 from the design position, the assembly is performed. The error is absorbed when the lip connecting portion 3 is displaced in the radial direction with respect to the grommet body 2.

  The lip connecting portion 3 includes an outer cylindrical portion 9 that extends from the vicinity of the cylindrical hole portion 5 to one side in the axial direction, a bent portion 10 that is turned back radially inward from the entire circumference of the distal end of the outer cylindrical portion 9, and a bent portion 10 The inner cylinder part 11 extends from the entire circumference of the tip end to the other side in the axial direction and passes through the inner side of the outer cylinder part 9. The inner cylinder part 11 has a total length of the tip part 11 a of the inner cylinder part 11. Since it is formed long so as to protrude from the portion 5 to the other side in the axial direction, the lip connection portion 3 has a shape characteristic that is highly flexible in the radial direction. For this reason, as shown in FIG. 3, an external force (an example is indicated by an arrow 27 in FIG. 3) that intersects the insertion direction acts on the linear member 26, and the inclination of the linear member 26 from the axial direction is increased. Even in this case, the lip connection portion 3 is likely to be deformed following the increase in the inclination of the linear member 26.

  Therefore, it is possible to absorb the assembly error without deteriorating the sealing performance.

  Moreover, since the lip connection part 3 has the above-mentioned bending part 10, it becomes a shape characteristic with high flexibility in the axial direction. Therefore, as shown in FIG. 4, even when an external force along the insertion direction is applied to the linear member 26 (an example is indicated by an arrow 28 in FIG. 4), it follows the movement of the linear member 26. Thus, the lip connecting portion 3 is easily deformed, and the deterioration of the sealing performance can be prevented.

  An operator who wears the grommet 1 can attach the grommet by grasping and pulling the inner cylinder portion 11 of the grommet 1 together with the linear member 26, and the grommet main body 2 is attached to the grommet mounting hole 25 by the inclined surface 8. Therefore, the grommet 1 can be easily installed.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The grommet according to the present invention can be widely used for trucks and other vehicles.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Grommet main body 3 Lip connection part 4 Lip part 5 Cylinder hole part 6 Engaging groove part 7 Flange part 8 Inclined surface 9 Outer cylinder part 10 Bending part 11 Inner cylinder part 11a End part of inner cylinder part 22 Body panel 24 Bracket ( Plate member)
25 Grommet mounting hole (through hole)
26 Linear members

Claims (3)

A grommet that is integrally formed with an elastic material,
A cylindrical grommet body having an annular engagement groove on the outer periphery;
An outer cylindrical portion extending in one direction intersecting with the radial direction of the cylindrical hole portion from the vicinity of the cylindrical hole portion of the grommet main body, and a bent portion that is folded inward in the radial direction from the entire tip of the outer cylindrical portion; A lip connection part having an inner cylinder part extending in the other direction from the entire circumference of the bent part and passing through the inner side of the outer cylinder part;
An annular lip portion that protrudes inward in the radial direction from the inner peripheral surface of the distal end portion of the inner cylinder portion. The grommet according to claim 1,
The grommet characterized in that the tip end portion of the inner cylindrical portion protrudes in the other direction from the cylindrical hole portion. The grommet according to claim 1 or 2, wherein
The end face in the other direction of the grommet body is an inclined surface that inclines in the one direction toward the outer side in the radial direction.

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