JP2012222838A - Inner member for grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner member for a grommet in which increase in the size is avoided while holding force with respect to a panel is ensured.SOLUTION: An inner member 10 includes: a cylindrical portion 20 inserted and held to a mounting hole 101 of a panel 100 and having an insertion hole 23 through which a wire harness 200 can be inserted; and a lock arm 60 which can oscillate in a seesaw manner using a base end portion 61 continuing to an outer peripheral face of the cylindrical portion 20 as a fulcrum and elastically locks an opening edge of the mounting hole 101 of the panel 100 to restrict coming-off of the cylindrical portion 20 from the panel 100. The base end portions 61 of the lock arm 60 take a fixed-fixed beam shape in which both ends of the base end portions 61 in the peripheral direction orthogonal to an insertion direction to the mounting hole 101 with respect to the outer peripheral face of the cylindrical portion 20 are supported.

Description

  The present invention relates to an inner member of a grommet.

  Patent Document 1 discloses a conventional grommet inner member. This is provided with a cylindrical portion on which grommets are covered from the outside and a pair of deflectable lock arms protruding from both radial ends of the outer peripheral surface of the cylindrical portion. An insertion hole through which the wire harness can be inserted is formed through the cylindrical portion. The lock arm has a cantilever shape extending rearward from the front side of the cylindrical portion, and can be bent and deformed inward and outward.

  Here, the cylindrical portion is inserted into the mounting hole of the panel. In the insertion process, the lock arm slides on the inner surface of the mounting hole and is bent and deformed inward. Further, at the time of normal insertion, the lock arm moves backward to lock the opening edge of the mounting hole, whereby the cylinder is held in a state of being prevented from being detached from the panel.

JP 2007-227026 A

  By the way, in the above-described case, the locking allowance of the lock arm is large, thereby increasing the holding force of the inner member with respect to the panel. However, as the lock arm locking margin increases, the length of the lock arm increases accordingly, leading to an increase in size of the lock arm in the front-rear direction and, consequently, an increase in the size of the entire inner member in the front-rear direction.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide an inner member that avoids an increase in size while securing a holding force for a panel.

  As a means for achieving the above object, the invention of claim 1 is an inner member attached to the inside of the grommet, which is inserted and held in the mounting hole of the panel, and can be inserted through the wire harness. And a base end portion connected to the outer peripheral surface of the cylindrical portion, and can be rocked in a seesaw shape, and the opening edge of the mounting hole of the panel is elastically locked. A lock arm that restricts the cylindrical portion from coming off from the base, and the base end portion of the lock arm supports both ends in the circumferential direction perpendicular to the insertion direction into the mounting hole with respect to the outer peripheral surface of the cylindrical portion. It is characterized by the shape of a doubly supported beam.

  According to a second aspect of the present invention, in the first aspect of the present invention, a concave portion is formed radially inward at a position corresponding to the lock arm in the cylindrical portion, and the bottom surface of the concave portion and the lock arm It is characterized in that a bending space of the base end portion is formed therebetween.

  According to a third aspect of the present invention, in the one according to the first or second aspect, the lock arm is provided with a restricting protrusion that protrudes in a direction opposite to a direction in which the lock arm swings during insertion. In the case where the lock arm tends to swing and displace excessively in the reverse direction, the restriction projection is in contact with the outer peripheral surface of the cylindrical portion.

  According to a fourth aspect of the present invention, in the one according to any one of the first to third aspects, a curved rounded portion is formed by burring at the opening edge of the mounting hole of the panel, and the lock arm is In the opening edge portion of the mounting hole of the panel, the portion outside the rounded portion is locked.

<Invention of Claim 1>
Since the base end of the lock arm has a doubly-supported beam shape that supports both ends in the circumferential direction orthogonal to the direction of insertion into the mounting hole with respect to the outer peripheral surface of the cylindrical portion, even if the locking allowance of the lock arm is large The lock arm does not have to increase in the insertion direction. As a result, it is avoided that the inner member becomes large. Moreover, according to this invention, the length between the circumferential direction both ends in the base end part of a lock arm is securable within the range of the outer peripheral surface of a cylinder part.

<Invention of Claim 2>
At the position corresponding to the lock arm in the cylindrical portion, a recess is formed inward in the radial direction, and a bending space of the base end is formed between the bottom surface of the recess and the base end of the lock arm. A large bending space can be secured. Therefore, even if the locking allowance of the lock arm is increased, the insertion resistance of the lock arm does not increase significantly, and the work load is reduced.

<Invention of Claim 3>
When a force in the pulling direction acts on the tube part, the lock arm swings and displaces in a direction opposite to the swinging direction during the insertion process, and the locked state with the panel is released, so that the tube part may come out of the panel. There is. However, according to the present invention, when the lock arm tries to swing and displace excessively in the reverse direction, the restricting protrusion comes into contact with the outer peripheral surface of the tube portion, and further swinging operation is restricted. Is prevented from exiting the panel.

<Invention of Claim 4>
Since the lock arm is configured to lock a portion outside the rounded portion of the opening edge of the mounting hole of the panel, it is necessary to ensure a large locking height of the lock arm. In that respect, according to the present invention, since both ends in the circumferential direction at the base end portion of the lock arm are supported by the outer peripheral surface of the cylindrical portion, a large locking height of the lock arm can be ensured. Therefore, the present invention can be suitably applied to the case where the opening edge of the mounting hole of the panel is subjected to burring.

1 is a perspective view of an inner member attached to a grommet according to Embodiment 1 of the present invention. It is a front view of an inner member. It is a side view of an inner member. It is a rear view of an inner member. It is an expanded sectional view showing the lock arm before latching a panel. It is an expanded sectional view showing the lock arm in the middle of latching a panel. It is an expanded sectional view showing the lock arm which latched the panel. It is an expanded sectional view showing the lock arm which the control protrusion contact | abutted to the outer peripheral surface of the cylinder part. It is a perspective view of the inner member of the grommet hold | maintained at the panel.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The inner member 10 according to the present embodiment is made of synthetic resin, and includes a cylindrical portion 20 and a lock arm 60 formed integrally with the cylindrical portion 20 as shown in FIG. A grommet 50 is placed on the cylindrical portion 20 from the rear. And the cylinder part 20 is attached to the flat panel 100 with the grommet 50, as shown in FIG.

  As shown in FIG. 5, the panel 100 is formed with a circular mounting hole 101. A burring portion 110 is raised and formed at the opening edge of the mounting hole 101 on the rear surface of the panel 100 by burring by a punch (not shown) entering from the front. Further, a curved round portion 111 is formed at the opening edge of the mounting hole 101 on the front surface of the panel 100 as the burring portion 110 is formed.

  The grommet 50 is made of rubber or elastomer, and as shown in FIGS. 1 and 9, an annular flange portion 51 that holds the tubular portion 20 from the outside, and an inner side of the flange portion 51 and the wire harness 200. A cylindrical body portion 52 that is externally fitted to the body portion, and a connecting portion 53 that extends in the radial direction and is continuous with both the body portion 52 and the flange portion 51. The trunk | drum 52 is made into the form extended elongate in the front-back direction. As shown in FIG. 7, the front surface of the flange portion 51 is brought into close contact with the opening edge portion of the mounting hole 101 on the rear surface of the panel 100. Further, a fitting groove 54 is formed on the inner side of the flange portion 51 over the entire circumference.

  As shown in FIGS. 2 and 3, the cylindrical portion 20 includes a substantially cylindrical main body portion 21 and an annular outer peripheral portion 22 that projects radially outward from the rear end of the main body portion 21. As shown in FIG. 7, the outer peripheral portion 22 is fitted into the fitting groove 54 of the grommet 50 from the inside. Further, the inside of the main body portion 21 is an insertion hole 23, and the trunk portion 52 of the grommet 50 is arranged at the center of the insertion hole 23. That is, the wire harness 200 is inserted into the insertion hole 23 of the cylindrical portion 20. The cylindrical portion 20 is inserted and held in the mounting hole 101 of the panel 100 together with the grommet 50.

  Moreover, as shown in FIG.2 and FIG.4, the flexible hinge 24 extended in the circumferential direction is formed in the cylinder part 20. As shown in FIG. The hinge 24 is configured as a part of the main body portion 21, and the flange portion 51 is cut off at a position corresponding to the hinge 24 in the cylindrical portion 20. Further, a pair of locking end portions 25 that can be separated from each other are formed at positions facing the hinge 24 on the opposite side in the radial direction across the center portion of the insertion hole 23 in the cylindrical portion 20. The cylindrical portion 20 can be opened and closed via a hinge 24 in a closed state in which both locking end portions 25 are abutted and an open state in which both locking end portions 25 are separated from each other. Both locking end portions 25 are formed with lock portions 26 that can be elastically locked to each other, and the lock portions 26 are locked to each other, whereby the cylindrical portion 20 is held in a closed state. Further, when the cylindrical portion 20 is in the open state, the wire harness 200 is inserted into the cylindrical portion 20 through the opening between the both locking end portions 25. A plurality of recesses 27 are formed in the main body portion 21 inward in the radial direction at intervals in the circumferential direction. The recess 27 has a cup shape that bulges toward the center of the insertion hole 23, and is open to the front and the outside.

  The lock arm 60 can be elastically locked to the front side of the panel 100 and is formed at a position corresponding to each recess 27 in the main body 21. Specifically, the lock arm 60 includes a base end portion 61 that is continuous with the outer peripheral surface of the main body portion 21, and an arm main body 62 that is continuous with the base end portion 61 and extends in both the front and rear directions. The arm main body 62 can be oscillated and displaced in a seesaw shape inside and outside with a connection position with the base end portion 61 as a fulcrum.

  The base end portion 61 extends in the circumferential direction along the outer peripheral surface of the main body portion 21, and has a doubly-supported beam shape in which both ends in the extending direction are connected to both ends in the circumferential direction of the outer opening of the recess 27. An arm main body 62 is disposed at the center in the length direction of the base end portion 61, and the base end portion 61 is laid between the both side surfaces of the arm main body 62 and the opening end of the recess 27. The base end portion 61 is elastically deformable inward and outward with the arm body 62 as a center. A bending space 80 is formed between the base end portion 61 and the bottom surface of the recess 27. When the base end portion 61 is bent and deformed in the bending space 80, the arm body 62 is displaced so as to sink inward in the radial direction.

  As shown in FIGS. 1 and 5, the arm main body 62 has a locking projection 63 that gradually increases in thickness from the front end toward the rear. The front surface of the locking projection 63 is a guide surface 64 that inclines outward toward the rear, and is slidable on the inner surface of the mounting hole 101 during the insertion process into the mounting hole 101. The rear surface of the locking protrusion 63 is a locking surface 65 that is substantially vertical, and can be locked to the front side of the panel 100. Note that the locking projection 63 is disposed at a position overlapping the base end portion 61 in the front-rear direction. Further, a plate-like protruding piece 66 is formed at the rear end portion of the arm main body 62 behind the locking protruding portion 63. The protruding piece 66 can be brought into contact with the burring portion 110 of the panel 100.

  Further, a restriction projection 67 is formed on the front end portion of the arm body 62 so as to protrude inward. The rear surface of the restricting projection 67 is disposed substantially orthogonal to the inner surface of the arm main body 62. When the arm body 62 tends to tilt excessively forward, the tip of the restricting projection 67 comes into contact with the inner surface of the bottom wall of the recess 27, thereby restricting further tilting of the arm body 62. . That is, the forward tilt amount (swing amount) of the arm main body 62 is suppressed by the restricting protrusion 67.

The structure of the inner member 10 of the grommet 50 according to the present embodiment is as described above. Next, an operation for attaching the inner member 10 to the panel 100 will be described.
First, the wire harness 200 is inserted and held in the trunk portion 52 of the grommet 50, the inner member 10 is placed in a closed state so as to surround the trunk portion 52, and the flange 22 of the grommet 50 is disposed on the outer peripheral portion 22 of the inner member 10. The part 51 is fitted. Next, the inner member 10 is inserted into the mounting hole 101 of the panel 100 from the rear. In the insertion process, as shown in FIGS. 5 to 6, the guide surface 64 of the locking projection 63 slides on the inner surface of the mounting hole 101 of the panel 100, and the arm body 62 uses the base end portion 61 as a fulcrum. Swing and displace in the shape of a seesaw inward. Specifically, the front end portion of the arm body 62 is tilted in a direction to rise outward. Further, at the same time as the arm main body 62 is swung and displaced, the base end portion 61 is bent and deformed in a substantially U shape in the bending space 80, and accordingly, the entire position of the arm main body 62 sinks radially inward. The shift is displaced as follows. For this reason, even if the protrusion amount of the latching protrusion 63 is large, the insertion resistance does not become particularly large.

  When the inner member 10 is properly inserted into the mounting hole 101 of the panel 100, as shown in FIG. 7, the base end portion 61 is elastically returned to the original state and the swinging state of the arm body 62 is released. The locking projection 63 is disposed so as to be able to be locked to the opening edge of the mounting hole 101 on the front surface of the panel 100 through the front of the mounting hole 101. Specifically, the outer end portion of the locking surface 65 of the locking protrusion 63 is arranged to face the portion outside the rounded portion 111 in the opening edge portion of the mounting hole 101. As a result, the panel 100 is disposed so as to be sandwiched between the locking projection 63 and the outer peripheral portion 22 via the grommet 50, and the inner member 10 is pulled out to the mounting hole 101 of the panel 100 via the lock arm 60. It is held in a stopped state.

  Further, when the inner member 10 is attached to the panel 100 together with the grommet 50 in this way, the inside of the insertion hole 23 is liquid-tightly sealed by the connecting portion 53 and the trunk portion 52, and the flange portion 51 is in close contact with the rear surface of the panel 100. Thus, the periphery of the insertion hole 23 is liquid-tightly sealed.

  On the other hand, when the pulling force acts backward on the inner member 10 such as when the electric wire is pulled backward while the inner member 10 is attached to the panel 100, the arm main body 62 is accompanied with the bending operation of the base end portion 61. Oscillates in a direction opposite to the direction of insertion into the mounting hole 101, and the locking projection 63 reduces the locking allowance with the panel 100. Consequently, the locking state between the locking projection 63 and the panel 100 is reduced. May be dissociated and the inner member 10 may come out of the panel 100. However, according to the present embodiment, as shown in FIG. 8, when the arm main body 62 tries to swing and displace excessively in the direction opposite to that at the time of insertion, the tip of the restricting protrusion 67 becomes the recess 27 on the outer peripheral surface of the main body 21. A further swinging motion of the arm body 62 is restricted by contacting the bottom surface of the arm body 62. For this reason, the latching state of the latching protrusion 63 and the panel 100 is reliably held, and the inner member 10 does not come out of the panel 100 carelessly.

  As described above, according to this embodiment, the base end portion 61 of the lock arm 60 supports both ends in the circumferential direction orthogonal to the insertion direction into the mounting hole 101 with respect to the outer peripheral surface of the cylindrical portion 20. Therefore, even if the locking allowance of the lock arm 60 is increased, the lock arm 60 does not have to be increased in the insertion direction (front-rear direction). As a result, the inner member 10 is prevented from becoming large. Further, with such a configuration, it is possible to ensure a large length between both ends in the circumferential direction of the base end portion 61 of the lock arm 60 within the range of the outer peripheral surface of the cylindrical portion 20.

  A concave portion 27 is formed radially inward at a position corresponding to the lock arm 60 in the cylindrical portion 20, and the base end portion 61 is bent between the bottom surface of the concave portion 27 and the base end portion 61 of the lock arm 60. Since the space 80 is formed, it is possible to ensure a large bending space 80. Therefore, even if the locking allowance of the lock arm 60 is increased, the insertion resistance of the lock arm 60 does not increase significantly, and the insertion workability is excellent. Moreover, since the height of the locking surface 65 of the locking protrusion 63 can be increased, the opening of the mounting hole 101 on the front surface of the panel 100 can be achieved even when the rounded portion 111 is formed on the front surface of the panel 100. A predetermined locking margin with respect to the panel 100 can be secured in a portion of the edge portion outside the rounded portion 111.

  Further, if the lock arm 60 tries to swing and displace excessively in the direction opposite to that when the lock arm 60 is inserted into the mounting hole 101, the restricting projection 67 contacts the outer peripheral surface of the cylindrical portion 20 and further swinging operation is restricted. Therefore, the cylindrical portion 20 is prevented from coming out of the panel 100.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The base end portion may have a leg portion that rises outward from the outer peripheral surface of the cylindrical portion. In this case, if the bending operation of the base end portion is performed within the length range of the leg portion, the concave portion can be omitted from the tube portion.
(2) The shape, position and number of the lock arms are arbitrary and can be changed from those of the above embodiment.
(3) The shape of the grommet is arbitrary and can be changed from that of the above embodiment.

DESCRIPTION OF SYMBOLS 10 ... Inner member 20 ... Cylindrical part 23 ... Insertion hole 27 ... Recessed part 50 ... Grommet 60 ... Lock arm 61 ... Base end part 62 ... Arm main body 63 ... Locking protrusion 67 ... Restriction protrusion 80 ... Deflection space 100 ... Panel 101 ... Mounting hole 111 ... Rear part 200 ... Wire harness

Claims (4)

An inner member mounted inside the grommet,
A cylindrical portion having an insertion hole that is inserted and held in the mounting hole of the panel and is capable of inserting a wire harness;
The base end portion connected to the outer peripheral surface of the cylindrical portion is swingable in a seesaw shape, and the opening edge of the mounting hole of the panel is elastically locked, so that the cylindrical portion from the panel is With a lock arm that regulates removal,
The grommet characterized in that the base end portion of the lock arm has a doubly-supported beam shape in which both ends in the circumferential direction orthogonal to the insertion direction into the mounting hole are supported on the outer peripheral surface of the cylindrical portion. Inner member.   A concave portion is formed radially inward at a position corresponding to the lock arm in the cylindrical portion, and a bending space of the base end portion is formed between the bottom surface of the concave portion and the lock arm. The inner member of a grommet according to claim 1.   When the lock arm is formed with a restricting protrusion that protrudes in a direction opposite to the direction in which the lock arm swings during the insertion process, and the lock arm tends to swing and displace excessively in the reverse direction, The inner member of a grommet according to claim 1 or 2, wherein the restricting projection is in contact with an outer peripheral surface of the cylindrical portion.   A curved rounded portion is formed on the opening edge of the mounting hole of the panel by burring, and the lock arm locks a portion outside the rounded portion of the opening edge of the mounting hole of the panel. The inner member of a grommet according to any one of claims 1 to 3, wherein the inner member is configured as described above.

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