JP2009219259A - Grommet mounting structure to wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grommet mounting structure to a wire harness, which can improve operating efficiency while obtaining a sufficient fixing effect. <P>SOLUTION: The grommet mounting structure is configured by including: a grommet 1 with a cylinder section 4 forming inner holes 7 for inserting the wire harnesses 3 and having a small diameter and a flange section 5 connected to the cylinder section 4 and having a large diameter; and a grommet clamping member 2 clamping the cylinder section 4 in the state inserting the wire harnesses 3. The cylinder section 4 of the grommet 1 is formed in a shape with continuous irregularities as a sectional shape orthogonal to the axial direction thereof. In the grommet clamping member 2, an approximately annular clamping section 10 and a lock section 11 engaging therewith are formed. Ribs 17 fitted into the recessed sections 8 of the cylinder section 4 are formed inside the clamping section 10. The clamping section 10 is formed in a width wider than the lock section 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grommet mounting structure to a wire harness.

  Conventionally, a grommet is attached to a wire harness routed through a vehicle body panel or the like of an automobile. By fitting the grommet into the through-hole of the vehicle body panel or the like, the wire harness can be protected from the cut end of the through-hole, and the waterproof, dustproof and soundproof can be achieved. The grommet has a small-diameter cylindrical portion that is in close contact with the inserted wire harness, and a large-diameter flange portion that is coupled to the cylindrical portion. The flange portion is formed as a portion that fits into the through hole. Several conventional examples relating to grommets will be described below.

  The first is an example related to a grommet attachment structure to a wire harness (see, for example, Patent Document 1 below). In this structure, a grommet and a binding band are provided, and after the wire harness is inserted into the cylindrical part of the grommet, the outer peripheral surface of the cylindrical part is tightened with the binding band. By tightening the cylindrical portion with the binding band, the grommet can be attached to the wire harness in a good state.

  The second is an example relating to a structure for facilitating the diameter expansion operation of the cylindrical portion of the grommet (see, for example, Patent Document 2 below). In this structure, a plurality of pleats are provided in the cylindrical portion. The reason for providing a plurality of pleats is that, when the size of the connector of the wire harness terminal is large, consideration is given to the problem that it becomes difficult to insert the wire harness into the cylindrical portion. By providing a plurality of pleats, it becomes easy to expand the diameter of the cylindrical portion, and after inserting the wire harness, the pleat returns to its original state and the cylindrical portion comes into close contact with the wire harness.

In the following Patent Document 2, a cylindrical portion having a plurality of pleats is formed in a shape that becomes narrower toward the distal end of the cylindrical portion. Moreover, the cylinder part and the wire harness are being fixed by the tape winding performed so that these may be straddle | crossed.
Japanese Patent Laying-Open No. 2005-65354 (page 6, FIG. 7) JP-A-10-302564 (3rd page, FIG. 1)

  By the way, the fixing by tape winding as in the second conventional example described above is not efficient because a good fixing effect cannot be obtained unless the tape is wound around the tube portion and the wire harness many times. Has the problem. Therefore, in order to improve the work efficiency, it is conceivable to take measures using a binding band.

  However, since the cylindrical part of the grommet has a plurality of pleats and has a shape that becomes narrower toward the distal end of the cylindrical part, the contact area between the cylindrical part and the binding band cannot be sufficiently secured, As a result, there arises a problem that a good fixing effect cannot be obtained (the binding band rotates on the outer periphery of the cylindrical portion or falls off).

  In consideration of the case where the wire harness and the grommet are disassembled for reuse, in the binding band, the fixing part of the binding band can be loosened and disassembled manually. On the other hand, in tape winding, it can be disassembled by peeling off all the wound tape. Accordingly, there is a problem in that work efficiency at the time of disassembly is poor regardless of whether a binding band or tape winding is used.

  This invention is made | formed in view of an above-described situation, and makes it a subject to provide the grommet attachment structure to the wire harness from which a sufficient fixing effect is acquired while working efficiency is favorable. It is another object of the present invention to provide a grommet attachment structure to a wire harness that also improves work efficiency during disassembly.

  The grommet attaching structure to the wire harness of the present invention according to claim 1 made to solve the above-mentioned problems includes a small-diameter cylindrical portion formed with an inner hole for inserting the wire harness, and the cylindrical portion. In the structure for attaching a grommet to a wire harness, comprising: a grommet having a large-diameter flange portion coupled; and a grommet tightening member that tightens the tube portion with the wire harness inserted. The cross-sectional shape orthogonal to the axial direction of the cylindrical portion is a shape in which irregularities are continuous, and the grommet fastening member has a substantially annular fastening portion and a lock portion that forms an engagement state, The portion has a rib on the inner side, and when the tube portion is tightened by the grommet tightening member, the rib fits into a recess of the tube portion. To have.

  According to the present invention having such a feature, since the tubular portion is tightened by the grommet tightening member, the attaching operation between the grommet and the wire harness can be performed efficiently. Since the rib is inserted into and fitted into the concave portion of the cylindrical portion, a sufficient contact area between the cylindrical portion and the grommet fastening member is ensured. Further, since the rib is in a state of pressing the cylindrical portion, the grommet fastening member does not rotate on the outer peripheral surface of the grommet and does not fall off from the grommet.

  A grommet mounting structure to a wire harness according to a second aspect of the present invention is the grommet mounting structure to the wire harness according to the first aspect, wherein the lock portion includes a locking portion and an engagement portion, The locking portion is characterized in that a thin portion for destruction at the time of dismantling is formed.

  According to the present invention having such characteristics, when an external force is applied to the thin portion during disassembly, the thin portion is destroyed by the external force. If the thin portion is destroyed, the grommet fastening member can be removed from the grommet. After removing the grommet tightening member from the grommet, the diameter of the cylindrical portion is expanded and the wire harness is pulled out from the grommet.

  The grommet attaching structure to the wire harness according to the third aspect of the present invention is the grommet attaching structure to the wire harness according to claim 1 or 2, wherein the grommet fastening member is configured such that the fastening portion is connected to the lock portion. Is also characterized by being formed wide.

  According to the present invention having such a feature, a sufficient contact area between the cylindrical portion and the grommet fastening member can be ensured. Therefore, the grommet can be further closely attached to the wire harness.

  According to the first aspect of the present invention, there is an effect that it is possible to provide a grommet mounting structure to a wire harness that has a good working efficiency and a sufficient fixing effect.

  According to the second aspect of the present invention, there is an effect that the dismantling work can be easily performed.

  According to the third aspect of the present invention, there is an effect that a sufficient contact area between the cylindrical portion and the grommet fastening member can be secured.

  Hereinafter, an embodiment of a grommet mounting structure to a wire harness according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an embodiment of a grommet attachment structure to a wire harness according to the present invention. FIG. 2 is an enlarged view of a portion where a grommet fastening member is attached. FIG. 3 is a view of the grommet fastening member, FIG. 3 (a) is a plan view showing the unlocked state, and FIG. 3 (b) is a plan view showing the locked state. FIG. 4 is an enlarged view of a locking portion of the grommet fastening member in FIG. FIG. 5 is a view of the grommet, FIG. 5 (a) is a plan view showing a natural state, and FIG. 5 (b) is a plan view showing a state when the diameter of the cylindrical portion is expanded.

  In FIG. 1, reference numeral 1 is a grommet, reference numeral 2 is a grommet fastening member, and reference numeral 3 is a wire harness.

  The grommet 1 is made of rubber or elastomer and has a small diameter cylindrical portion 4 and a large diameter flange portion 5. The flange portion 5 is coupled to the cylindrical portion 4 and is formed in a tapered shape. At the end of the flange portion 5, a panel fitting portion 6 is formed for fitting into a through-hole such as a vehicle body panel (not shown). The grommet 1 has not only the protection of the wire harness 3 but also the effect of soundproofing, dustproofing and waterproofing by fitting the panel fitting part 6 to a through hole such as a vehicle body panel (not shown). .

  Here, the cylinder part 4 of the grommet 1 which is one structural member of the characteristic of this invention is demonstrated in detail. As shown in FIG. 2, an inner hole 7 for inserting the wire harness 3 is formed in the cylindrical portion 4. The inner hole 7 is formed straight along the axis of the cylindrical portion 4 (assuming an example). The cylinder portion 4 is formed with a uniform thickness (assumed to be an example). The cylindrical portion 4 is formed in a shape in which a concave portion 8 having a semicircular arc shape in cross section perpendicular to the axial direction and a convex portion 9 having a semicircular arc shape are continuously continued in the circumferential direction. Further, the concave portion 8 is formed in a shape in which an inscribed circle is formed, and the convex portion 9 is formed in a shape in which a circumscribed circle is formed. Such a cross-sectional shape is formed so as to continue from the tip of the cylindrical portion 4 to the coupled portion with the flange portion 5.

  Since the cylindrical portion 4 has the above-described cross-sectional shape, when a force is applied uniformly from the inner hole 7 side toward the outer side in the radial direction, the concave portion 8 and the convex portion 9 are extended so that these steps are reduced. It has become. That is, a deformation as shown in FIG. 5 occurs. In addition, such a deformation | transformation shall be produced without using a diameter expander etc. The cylindrical part 4 naturally returns to its original state when the above force is stopped (see FIG. 5). The cylinder part 4 is formed so that the outer circumference is longer than a simple cylinder due to the cross-sectional shape.

  1 to 3, the grommet fastening member 2 is a synthetic resin molded product and a constituent member of the present invention, and includes a fastening portion 10 and a lock portion 11. The fastening part 10 has a first fastening part 12, a second fastening part 13, and a hinge 14 (assumed to be an example. Depending on the size of the grommet, the hinge may not be provided, In addition, a plurality of hinges may be provided), and the lock portion 11 includes a locking portion 15 and an engagement portion 16.

  The first tightening portion 12 is formed in a substantially semicylindrical shape. The first tightening portion 12 is formed to have a width approximately equal to the length of the cylindrical portion 4 of the grommet 1. Two ribs 17 are provided on the inner side of the first fastening part 12 (the number is an example. It is sufficient if a plurality of the fastening parts 10 are provided). A locking portion 15 is coupled to the center of one end of the first tightening portion 12. A hinge 14 is coupled to the other end of the first tightening portion 12. The first fastening part 12 is coupled to the other end of the second fastening part 13 via a hinge 14.

  The second tightening portion 13 is formed in a substantially semi-cylindrical shape like the first tightening portion 12. The second tightening portion 13 is formed to have a width approximately equal to the length of the cylindrical portion 4 of the grommet 1. Two ribs 17 are provided inside the second tightening portion 13 (the number is an example. A plurality of the ribs 17 may be provided for the tightening portion 10). An engaging portion 16 is coupled to the center of one end of the second tightening portion 13. A hinge 14 is coupled to the other end of the second tightening portion 13.

  The hinge 14 is formed so as to have the same width as the first fastening part 12 and the second fastening part 13 (assumed to be an example).

  The grommet fastening member 2 is formed to be substantially annular when an engagement state described later is formed by the lock portion 11. The first tightening portion 12 and the second tightening portion 13 are formed to be wider than the lock portion 11.

  The rib 17 is formed in a substantially semi-cylindrical shape (assumed as an example). The rib 17 is formed so as to be parallel to the axis of the cylindrical portion 4 when the grommet fastening member 2 is formed into the substantially cylindrical shape. The rib 17 is arrange | positioned in the position which divides each inner side of the 1st clamping part 12 and the 2nd clamping part 13 into 3 parts (it shall be an example). Such a rib 17 can press the tube portion 4 to be brought into close contact with the wire harness 3 when the rib 17 is inserted into and fitted into the recess 8 of the tube portion 4 of the grommet 1. Yes. The grommet fastening member 2 can increase the contact area with the cylindrical portion 4 of the grommet 1 by forming the rib 17.

  3 and 4, the locking portion 15 constituting the lock portion 11 has a first cover 18 and a locking projection 19. The first cover 18 is a portion that is continuous with the first fastening portion 12 and is formed in a box shape. The locking projection 19 is formed so as to extend in the arc direction of the first tightening portion 12. The locking projection 19 is formed so as to protrude from the center of the opening portion of the first cover 18. A locking claw 20 is formed on the locking projection 19 on the tip side. Such a locking projection 19 is formed with a thin portion 21 which is one of the features of the present invention at the position of the opening. The thin portion 21 is formed as a portion to which an external force is applied during dismantling and is destroyed.

  The engaging portion 16 has a second cover 22 and a locking hole 23. Similar to the first cover 18, the second cover 22 is formed in a box shape. The second cover 22 is formed so as to be continuous with the second fastening portion 13. The locking hole 23 is formed inside the second cover 22. When the locking projections 19 of the locking portion 15 are inserted, the locking holes 23 can be engaged with each other by hooking the locking claws 20 of the locking projections 19.

  In the above configuration, in order to attach the grommet 1 to the wire harness 3, first, an operation of inserting the wire harness 3 into the grommet 1 is performed. During this work, it is necessary to increase the diameter of the cylindrical portion 4 of the grommet 1 depending on the size of the connector attached to the end of the wire harness 3. However, since the cylindrical portion 4 of the grommet 1 is formed in the above-described shape that can be expanded without using a diameter expander, the diameter can be easily expanded. Therefore, the wire harness 3 can be easily inserted. If the tube part 4 is brought into a natural state after the diameter of the tube part 4 is increased, the tube part 4 comes into close contact with the wire harness 3. Thereby, the operation | work which inserts the wire harness 3 in the grommet 1 is completed.

  Next, the grommet fastening member 2 is attached to the grommet 1 in which the wire harness 3 is inserted. This operation is performed so that the grommet fastening member 2 is oriented so as to be coaxial with the tubular portion 4 of the grommet 1 and the tubular portion 4 is sandwiched from the outside by the first fastening portion 12 and the second fastening portion 13. . When the tube portion 4 is sandwiched between the first tightening portion 12 and the second tightening portion 13, the ribs 17 are inserted into the concave portions 8 of the tube portion 4 to be fitted. At this time, the cylindrical portion 4 is pressed by the rib 17. In such a state, when the locking projection 19 of the locking part 15 is inserted into the locking hole 23 of the locking part 16, the locking part 11 is locked, and the attachment of the grommet tightening member 2 is completed.

  After completion of the mounting operation, the rib 17 is fitted in the concave portion 8 of the cylindrical portion 4, so that the contact area between the grommet fastening member 2 and the grommet 1 is sufficiently secured. In addition, since the rib 17 presses the cylindrical portion 4, the grommet 1 is in good contact with the wire harness 3.

  Further, in the grommet fastening member 2 having the above-described configuration, the fastening portion 10 is wide and is formed to have the same width as the length of the cylindrical portion 4 of the grommet 1, so that the grommet fastening member 2 and the grommet 1 are in contact with each other. The area is more sufficiently secured.

  By the way, in the above configuration, when it is necessary to disassemble the grommet 1 and the wire harness 3 for recycling or the like, if a certain external force is applied to the lock part 11 of the grommet fastening member 2, the locking part 15 The thin portion 21 on the proximal end side of the engagement protrusion 19 is destroyed. Thereby, the grommet fastening member 2 can be removed.

  As described above with reference to FIGS. 1 to 5, according to the grommet mounting structure to the wire harness of the present invention, the cylindrical portion 4 of the grommet 1 is formed in a shape that is easy to expand, Since the grommet fastening member 2 as described above is used to fasten the grommet 1 and fix the grommet 1 to the wire harness 3, a structure with good work efficiency can be provided.

  In addition, since the grommet fastening member 2 is formed so as to ensure a sufficient contact area with the cylindrical portion 4 of the grommet 1 and to sufficiently press the cylindrical portion 4, the grommet 1 is made more than conventional. It can be satisfactorily fixed to the wire harness 3. The grommet fastening member 2 does not rotate on the outer periphery of the cylindrical portion 4 of the grommet 1 and does not fall off from the grommet 1.

  In addition, disassembly work can be easily performed by having the thin part 21 in the lock part 11.

  Subsequently, another embodiment of the grommet attaching structure to the wire harness of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is an enlarged perspective view of a portion where a grommet fastening member is attached. FIG. 7 is a diagram of the grommet of FIG. 6, in which FIG. 7 (a) is a plan view showing a natural state, and FIG. 7 (b) is a plan view showing a state when the diameter of the cylindrical portion is expanded. In addition, the same code | symbol is attached | subjected to the same structure as the above-mentioned form, and the detailed description shall be abbreviate | omitted.

  In FIG. 6, compared with the above-mentioned form, only the cross-sectional shape orthogonal to the axial direction of the cylinder part 4 'of the grommet 1 is different. Therefore, in the present embodiment, only the cross-sectional shape orthogonal to the axial direction of the cylindrical portion 4 ′ of the grommet 1 will be described.

  The cylindrical portion 4 ′ of the grommet 1 is formed by continuously and continuously forming a concave portion 8 ′ and a convex portion 9 ′ having a corrugated cross-sectional shape in the circumferential direction. Further, the concave portion 8 ′ is formed in a shape in which an inscribed circle is formed, and the convex portion 9 ′ is formed in a shape in which a circumscribed circle is formed.

  The cylindrical portion 4 ′ of the grommet 1 is formed in a shape that is easy to expand in diameter, similarly to the above-described form, and is also formed to have a recess 8 ′ into which the rib 17 of the grommet fastening member 2 is inserted and fitted. Has been. Accordingly, it goes without saying that the same effects as those of the above-described embodiment are obtained.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

  That is, in the embodiment described above, the cross-sectional shape of the cylindrical portions 4 and 4 ′ of the grommet 1 is not limited to this. The cross-sectional shape is not particularly limited as long as the cross-sectional shape has a recess that allows the rib 17 to be inserted and fitted therein, and the cylindrical portion 4 is formed in a shape that allows the diameter to be easily increased.

It is a perspective view which shows one Embodiment of the grommet attachment structure to the wire harness of this invention. It is an enlarged view of the part which attached the grommet clamping member. It is a figure of a grommet clamping member, (a) is a top view which shows an unlocked state, (b) is a top view which shows a locked state. It is an enlarged view of the latching | locking part of the grommet clamping member in FIG. It is a figure of a grommet, (a) is a top view which shows the state at the time of natural, (b) is a top view which shows the state at the time of cylinder part diameter expansion. It is a figure which shows the form of the other Example of the grommet attachment structure to the wire harness of this invention, and is an expanded perspective view of the part which attached the grommet clamping member. It is a figure of the grommet of FIG. 6, (a) is a top view which shows the state at the time of natural, (b) is a top view which shows the state at the time of cylinder part diameter expansion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grommet 2 Grommet fastening member 3 Wire harness 4, 4 'cylinder part 5 Flange part 6 Panel fitting part 7 Inner hole 8, 8' Concave part 9, 9 'Convex part 10 Fastening part 11 Locking part 12 First fastening part 13 First Two fastening portions 14 Hinge 15 Locking portion 16 Engaging portion 17 Rib 18 First cover 19 Locking protrusion 20 Locking claw 21 Thin portion 22 Second cover 23 Locking hole

Claims (3)

A cylindrical portion having a small diameter formed with an inner hole for inserting a wire harness, a grommet having a large diameter flange portion coupled to the cylindrical portion, and the cylindrical portion in a state where the wire harness is inserted. In the grommet mounting structure to the wire harness configured to include a grommet tightening member to be tightened,
The cylindrical part has a shape in which the cross-sectional shape orthogonal to the axial direction of the cylindrical part is continuous with irregularities,
The grommet tightening member has a substantially annular tightening portion and a lock portion that forms an engaged state,
The tightening portion has a rib on the inside,
A structure for attaching a grommet to a wire harness, wherein the rib is fitted into a concave portion of the tube portion when the tube portion is tightened by the grommet tightening member. In the grommet attachment structure to the wire harness according to claim 1,
The lock part has a locking part and an engaging part,
A structure for attaching a grommet to a wire harness, wherein the locking portion is formed with a thin portion for destruction at the time of disassembly. In the grommet mounting structure to the wire harness according to claim 1 or 2,
The grommet fastening member has a structure in which the fastening part is formed wider than the lock part.

Images