JP5947673B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet into which an electric wire is inserted.

  For example, a grommet is fitted and attached to a hole through which an electric wire is passed in a vehicle body panel that partitions the inside and outside of a vehicle cabin. By passing the electric wire through the grommet in this way, the electric wire is protected while ensuring waterproofness.

  As this grommet, a grommet made of an integrally molded product of a rubber material is known (for example, see Patent Document 1). In this grommet, the grommet main body portion includes a circumferential groove for engaging the periphery of the through hole on the outer periphery between the small-diameter annular portion and the large-diameter annular portion, and the outer peripheral surface of the small-diameter annular portion is tapered. It is a guide surface. One hooking protrusion and one or more moderation feeling protrusions are provided on the guide surface. In this grommet, when the grommet body is mounted in the through hole of the panel, resistance is generated when the moderation projection passes through the through hole, and when the peripheral edge of the through hole is fitted in the circumferential groove, a sudden resistance is generated. Since this is a change, it is possible to obtain a certain feel that the peripheral edge of the through hole is definitely fitted in the circumferential groove.

JP 2004-274886 A

  The grommet has a hooking projection and a moderation projection on a tapered guide surface. However, integrally forming a grommet having a complicated shape having such hooking protrusions and moderation feeling protrusions with an elastic material makes it difficult to remove the grommets from the molding die. Therefore, in order to remove the grommet after molding, the mold for molding must be divided into a plurality of parts, and the shape of the mold itself becomes complicated. This increases the equipment cost and increases the manufacturing cost due to an increase in the number of work steps.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the grommet excellent in assembly | attachment workability | operativity, suppressing the cost increase.

In order to achieve the above-described object, the grommet according to the present invention is characterized by the following (1) to (4).
(1) A grommet that holds an electric wire and is mounted in a mounting hole of a plate member through which the electric wire is passed to cause the electric wire to be liquid-tightly wired to the plate member,
A grommet body made of an elastic material in which an engagement groove into which an edge of the mounting hole is liquid-tightly engaged by being fitted into the mounting hole is formed over the circumferential direction;
It is made of a harder material than the grommet body, and includes an inner member accommodated in the grommet body.
The grommet main body has a locking plate portion extending laterally in the mounting direction front side of the mounting hole rather than the engagement groove, and a housing in which the front side in the mounting direction is opened over the circumferential direction of the grommet main body. A groove and a slit drilled from the inner wall surface of the housing groove toward the inside of the locking plate portion are formed,
The inner member includes an inner main body portion formed in a cylindrical shape, which is received in the receiving groove, and a locking piece portion formed to protrude radially outward from the inner main body portion,
The locking piece portion is provided integrally with the locking plate portion by inserting the locking piece portion into the slit.
(2) A grommet configured as described in (1) above,
The grommet body has a hole formed in the inner wall surface of the housing groove on the front side in the mounting direction, and is formed over the circumferential direction.
The inner body portion has a fixing piece protruding radially outward, and the fixing piece is inserted into the hole portion.
about.
(3) A grommet configured as described in (1) or (2) above,
The inner body portion has a locking claw that has a tip portion as a claw portion and extends toward the engagement groove of the grommet body across the wall portion that defines the housing groove.
about.
(4) A grommet configured as described in (3) above,
The locking claw has a tapered surface whose outer surface is inclined toward the center side of the inner body part toward the front in the mounting direction.
about.

In the grommet configured as described in (1) above, the edge of the mounting hole is inserted in a state where the locking plate portion is inserted into the mounting hole and the edge portion of the mounting hole is engaged with the engaging groove at the location where the locking plate portion is formed. By rotating with the engaging portion engaged by the portion as a fulcrum, the edge of the mounting hole can be inserted into the engaging groove and mounted on the plate material very easily. At this time, since the locking plate portion is integrally provided with a locking piece portion of an inner member made of a hard material than the grommet main body and has improved rigidity, the locking plate portion is inserted into the mounting hole. The mounting operation for rotating the grommet can be performed easily and reliably. Thereby, even when the mounting hole is arranged in a narrow place and visual observation is difficult, the grommet can be easily fitted into the mounting hole and the electric wire can be wired.
In addition, since the edge of the mounting hole of the vehicle body panel is engaged with the engaging groove of the grommet body made of an elastic material, the grommet and the plate material can be securely adhered to ensure good waterproofness and sound insulation. Moreover, an excessive force is not applied to the edge of the mounting hole of the plate material, and defects such as deformation can be suppressed.
Further, according to the grommet having the configuration (1), the grommet has a complicated shape because the inner member having the locking piece portion integrally provided on the locking plate portion is separated from the grommet body. However, simplification of the shapes of the grommet body and the inner member can be achieved. As a result, it is possible to simplify the shapes of the molds for molding these grommet main bodies and inner members and to facilitate the molding operation of these grommet main bodies and inner members, thereby reducing equipment costs and manufacturing costs. Can be achieved.
In addition, according to the grommet having the configuration (1), since the locking plate portion having the locking piece portion of the inner member locks the vehicle body panel P, a problem that the grommet is detached from the mounting hole is prevented. .
According to the grommet having the configuration (2), since the fixing piece of the inner member is inserted into the hole portion of the grommet body, a problem that the grommet is deformed to be detached from the mounting hole is further prevented.
According to the grommet having the configuration of (3) or (4) above, the engaging claw of the inner member made of a hard material locks the edge of the mounting hole by being fitted into the mounting hole. It is possible to reliably prevent a problem that the mounting hole is detached from the mounting hole. In addition, it is possible to confirm the attachment of the grommet to the plate material with the feel and sound when the engagement claw engages the edge of the attachment hole, and thus it is possible to prevent the attachment of the grommet.

  ADVANTAGE OF THE INVENTION According to this invention, the grommet excellent in assembly workability | operativity can be provided, suppressing a cost increase.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the grommet according to the present embodiment. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a view for explaining how to attach the grommet according to the present embodiment to the vehicle body panel, and FIGS. 4A and 4B are side views, respectively. FIG. 5 is a cross-sectional view of a grommet according to a reference example. FIG. 6 is a cross-sectional view of a grommet according to a reference example.

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

  1 is a perspective view of a grommet according to the present embodiment, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. It is a figure explaining how to attach the grommet concerning a form to a body panel, and Drawing 4 (a) and Drawing 4 (b) are side views, respectively.

  As shown in FIGS. 1 to 3, the grommet 11 according to the present embodiment includes a grommet body 12 that is integrally formed from an elastic material such as rubber. The grommet body 12 is formed in a circular shape in plan view, and a cylindrical portion 13 formed in a cylindrical shape is integrally formed.

  The grommet body 12 has a filling space S. The filling space S has an opening 21 on one side, and the cylindrical portion 13 is provided on the opposite side of the opening 21 in the grommet body 12.

  On the inner peripheral surface of the grommet body 12 that forms the filling space S, a projecting portion 20 is formed in the vicinity of the opening 21 in the circumferential direction.

  The grommet body 12 has a mounting portion 12a on the opening 21 side. The mounting portion 12a fits into a mounting hole H formed in a vehicle body panel P of the vehicle to partition the engine room and the vehicle compartment of the vehicle, for example. Combined.

  The grommet main body 12 has an engaging groove 22 formed in the outer periphery thereof in the circumferential direction. In addition, the grommet body 12 has an outer peripheral surface on the front side in the mounting direction with respect to the mounting hole H with respect to the engagement groove 22 to have a tapered shape that gradually narrows toward the mounting direction with respect to the mounting hole H. 12b is formed. The grommet 11 is engaged with the edge of the mounting hole H guided by the guide surface 12b and entering the engaging groove 22 by fitting the mounting part 12a toward the mounting hole H. As a result, the edge of the mounting hole H in the vehicle body panel P is in close contact with the inner surface of the engagement groove 22, and the grommet 11 is mounted on the vehicle body panel P in a liquid-tight manner.

  The cylindrical portion 13 is formed in a cylindrical shape having an insertion hole 23, and an electric wire W wired to the mounting hole H of the vehicle body panel P is inserted into the insertion hole 23.

  The filling space S of the grommet body 12 is filled with a foam material 15. And between this electric wire W and the grommet 11 is sealed by this foam material 15.

  The foam material 15 is made of urethane foam or the like, expands from a liquid state, and then hardens.

  Further, the grommet body 12 is provided with a locking plate portion 26 projecting radially outward on the circumferential surface on the mounting portion 12a side (that is, the front side in the mounting direction to the mounting hole H) with respect to the engagement groove 22. It has been.

  The grommet main body 12 is formed with an accommodation groove 30 that is open on the mounting portion 12a side in the circumferential direction of the grommet main body 12, and an inner member 31 is accommodated in the accommodation groove 30. The inner member 31 is formed from a hard synthetic resin such as plastic, for example.

  The inner member 31 has an inner main body portion 32 formed in a cylindrical shape, and the inner main body portion 32 is disposed in the accommodation groove 30. The inner main body portion 32 is formed with an engaging protrusion 33 on the outer peripheral surface in the receiving direction in the receiving groove 30, and the engaging protruding portion 33 is formed in the inner groove 30 of the grommet main body 12. The main body 32 is engaged with a groove 35 formed on the outer peripheral side. The inner main body 32 is formed with a fixing piece 36 and a locking piece 37 that protrude outward in the radial direction. The fixing piece 36 is inserted into a hole 38 formed in the inner wall surface of the housing groove 30 of the grommet body 12. The locking piece 37 is inserted into a slit 39 that is drilled from the inner wall surface of the housing groove 30 of the grommet body 12 toward the locking plate 26.

  Further, the inner member 31 is formed with a locking claw 42 whose tip is a claw portion 41. The locking claw 42 extends toward the engagement groove 22 of the grommet body 12 across the wall portion of the grommet body 12 that defines the accommodation groove 30, and the outer surface thereof is attached to the attachment hole H. The taper surface 42a is gradually inclined toward the center of the inner main body 32 in the direction.

  In order to assemble the inner member 31 to the grommet main body 12, first, the locking piece portion 37 of the inner member 31 is inserted into the slit 39 of the locking plate portion 26 of the grommet main body 12. Next, the inner main body portion 32 of the inner member 31 is received in the receiving groove 30 of the grommet main body 12, and the engaging protrusion 33 is engaged with the groove portion 35. Further, the fixing piece 36 of the inner member 31 is inserted into the hole 38 of the grommet body 12. Thereby, the inner member 31 is assembled and integrated with the grommet body 12.

  Next, how to install the grommet 11 will be described.

  First, the electric wire W is inserted into the tubular portion 13 of the grommet body 12 before filling with the foam material 15.

  Thereafter, an appropriate amount of liquid foam material 15 is filled into the filling space S of the grommet body 12 from the opening 21.

  As described above, when an appropriate amount of the liquid foam material 15 is filled into the filling space S, the foam material 15 foams and expands and hardens over time.

  When the foam material 15 expands, the foam material 15 comes into close contact with the projecting portion 20 formed on the grommet body 12, and a part of the projecting portion 20 bites into the foam material 15, so that the grommet body 12 and the foam material 15 Are reliably integrated.

  After the foam material 15 is cured, the grommet 11 is fitted into the mounting hole H of the vehicle body panel P from the mounting portion 12a side, the edge of the mounting hole H is engaged with the engaging groove 22, and the grommet 11 is connected to the vehicle body panel P. To be liquid-tight.

  In order to attach the grommet 11 to the vehicle body panel P, first, the locking plate portion 26 is inserted into the attachment hole H as shown in FIG.

  Then, the edge portion of the mounting hole H is engaged with the engaging groove 22 at the location where the locking plate portion 26 is formed.

  In this state, the grommet 11 is rotated in the direction of the arrow α in the figure with the engagement point of the engagement groove 22 engaged with the edge of the mounting hole H as a fulcrum O.

  Then, as shown in FIG. 4B, the tapered surface 42 a of the locking claw 42 formed on the inner member 31 contacts the edge of the mounting hole H.

  Further, when the grommet 11 is rotated, the locking claw 42 is pressed radially inward by the edge portion of the mounting hole H and elastically deformed.

  Thereafter, the guide surface 12b of the grommet body 12 contacts the edge of the mounting hole H and is guided to the mounting hole H, and the edge of the mounting hole H enters the engagement groove 22 over the entire circumference. At this time, the locking claw 42 that has been elastically deformed enters the front side in the mounting direction of the grommet 11 in the vehicle body panel P and is restored radially outward, so that the claw portion 41 of the grommet 11 in the vehicle body panel P is restored. The edge on the front side in the mounting direction is locked.

  As a result, the grommet 11 is engaged with the engagement groove 22 at the edge of the mounting hole H of the vehicle body panel P, so that the grommet is securely attached to the vehicle body panel P in a liquid-tight manner. Wired.

  Here, when the electric wire W is pulled, a force that disengages from the vehicle body panel P may act on the grommet 11.

  However, in the grommet 11, the locking plate portion 26 having the claw portion 41 of the locking claw 42 of the inner member 31 and the locking piece portion 37 of the inner member 31 locks the vehicle body panel P. Is prevented from coming off from the mounting hole H. Further, since the fixed piece 36 of the inner member 31 is inserted into the hole 38 of the grommet main body 12, a part of the grommet main body 12 located near the hole 38 is elastically deformed by the fixed piece 36. Be regulated. For this reason, the malfunction that the grommet 11 deform | transforms and remove | deviates from the mounting hole H is prevented further.

  Here, what is shown in FIG. 5 is a grommet 101 integrally molded from an elastic material such as rubber. By fitting the grommet 101 into the mounting hole H of the vehicle body panel P, the edge of the mounting hole H is engaged with the engaging groove 102 formed on the outer periphery. Since this grommet 101 is mounted by simply fitting into the mounting hole H, it is difficult to easily fit into the mounting hole H particularly when the mounting hole H is arranged in a narrow place and is difficult to see. In addition, even when fitted into the mounting hole H, there is no mounting sound and it is difficult to confirm whether the edge of the mounting hole H is securely engaged with the engaging groove 102.

  On the other hand, according to the grommet 11 according to the present embodiment, the locking plate portion 26 is inserted into the mounting hole H, and the edge portion of the mounting hole H is formed in the engaging groove 22 at the position where the locking plate portion 26 is formed. In the engaged state, the engaging portion is rotated as the fulcrum O, so that the edge of the mounting hole H can be easily inserted into the engaging groove 22 and mounted on the vehicle body panel P. At this time, since the locking plate portion 26 is integrally provided with the locking piece portion 37 of the inner member 31 made of a harder material than the grommet main body 12 and the rigidity is increased, the locking plate is inserted into the mounting hole H. The mounting operation of inserting the portion 26 and rotating the grommet 11 can be performed easily and reliably. Thereby, even when the mounting hole H is arranged in a narrow place and visual observation is difficult, the grommet 11 can be easily fitted into the mounting hole H and the electric wire W can be wired.

  Moreover, since the engaging claw 42 of the inner member 31 made of a hard material engages the edge of the mounting hole H by being fitted into the mounting hole H, the mounting hole H can be mounted with a low mounting force. It is possible to reliably prevent such a problem that it comes off. In addition, it is possible to confirm the attachment of the grommet 11 to the vehicle body panel P with the feel and sound when the engaging claw 42 engages the edge of the attachment hole H. Can be prevented.

  Further, in the grommet 11 according to the present embodiment, the inner member 31 having the locking piece portion 37 and the locking claw 42 provided integrally with the locking plate portion 26 is separated from the grommet main body 12. Even if the grommet 11 has a complicated shape, the shapes of the grommet main body 12 and the inner member 31 can be simplified. Thereby, simplification of the shape of the mold for molding these grommet main body 12 and inner member 31 and simplification of the molding operation of these grommet main body 12 and inner member 31 can be achieved. The manufacturing cost can be reduced.

  In addition, since the edge of the mounting hole H of the vehicle body panel P engages with the engagement groove 22 of the grommet body 12 made of an elastic material such as rubber, the grommet 11 and the vehicle body panel P are securely brought into close contact with each other and good waterproofing is achieved. Performance and sound insulation can be ensured, and in addition, excessive force is not applied to the edge of the mounting hole H of the vehicle body panel P, and defects such as deformation can be suppressed.

  Further, the inner member 31 can be easily assembled to the grommet body 12 by being fitted into the receiving groove 30 of the grommet body 12.

  Here, what is shown in FIG. 6 is a grommet 114 in which a deep accommodation groove 113 is formed in the grommet body 112 in order to accommodate the inner member 111. In addition, the grommet 114 locks the edge of the mounting hole H by a locking claw 115 formed on the inner member 111, and the edge of the mounting hole H is attached to the waterproof rib 116 on the opposite side of the locking claw 115. It has a structure that ensures waterproofness by pressing.

  When the deep housing groove 113 is formed like the grommet 114, the thickness of the grommet main body 112 at the location where the housing groove 113 is formed becomes thin, and the sound insulation is reduced. Further, the waterproof rib 116 may be deformed and it may be difficult to ensure good waterproofness.

  On the other hand, in the grommet 11 according to the present embodiment, the grommet main body 12 is provided with a sufficient thickness even at the location where the accommodation groove 30 in which the inner member 31 is mounted is provided, so that sufficient sound insulation is ensured. be able to. Further, since the edge portion of the mounting hole H engages and comes into close contact with the engagement groove 22 of the grommet body 12 made of an elastic material such as rubber, it is possible to ensure good waterproofness without providing the waterproof rib 116 or the like. it can.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 11 Grommet 12 Grommet main body 22 Engaging groove 26 Locking plate part 30 Housing groove 31 Inner member 32 Inner main body part 36 Fixing piece 37 Locking piece part 38 Hole part 39 Slit 42 Locking claw H Mounting hole P Vehicle body panel (plate material)
W electric wire

Claims (4)

A grommet that holds an electric wire and is mounted in a mounting hole of a plate material through which the electric wire is passed to cause the electric wire to be liquid-tightly wired to the plate material,
A grommet body made of an elastic material in which an engagement groove into which an edge of the mounting hole is liquid-tightly engaged by being fitted into the mounting hole is formed over the circumferential direction;
It is made of a harder material than the grommet body, and includes an inner member accommodated in the grommet body.
The grommet main body has a locking plate portion extending laterally in the mounting direction front side of the mounting hole rather than the engagement groove, and a housing in which the front side in the mounting direction is opened over the circumferential direction of the grommet main body. A groove and a slit drilled from the inner wall surface of the housing groove toward the inside of the locking plate portion are formed,
The inner member includes an inner main body portion formed in a cylindrical shape, which is received in the receiving groove, and a locking piece portion formed to protrude radially outward from the inner main body portion,
The grommet, wherein the locking piece portion is integrally provided on the locking plate portion by inserting the locking piece portion into the slit. The grommet body has a hole formed in the inner wall surface of the housing groove on the front side in the mounting direction, and is formed over the circumferential direction.
The inner body portion has a fixing piece protruding radially outward, and the fixing piece is inserted into the hole portion.
The grommet according to claim 1, wherein: The inner body portion has a locking claw that has a tip portion as a claw portion and extends toward the engagement groove of the grommet body 12 across the wall portion that defines the housing groove.
The grommet according to claim 1 or 2, characterized in that. The locking claw has a tapered surface whose outer surface is inclined toward the center side of the inner body part toward the front in the mounting direction.
The grommet according to claim 3, wherein:

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