JP5765085B2 - Grommet - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a grommet, and more specifically, it is fitted on a wire harness routed in an automobile and attached to a through hole of a vehicle body panel to prevent water from entering the vehicle interior, dust, and abnormal noise from entering the vehicle interior. It is.

  A grommet for this type of wire harness is formed of rubber or elastomer, and has a small diameter cylindrical portion that allows a wire group constituting the wire harness to be inserted in a close-fitting state, and a continuous diameter increase on the outer peripheral surface of the small diameter cylindrical portion. A diameter-enlarging cylindrical portion having an annular body locking recess is provided on the outer peripheral surface. In order to fix the grommet in a predetermined position of the wire harness from the tip of the small diameter cylinder part of the grommet to the outer peripheral surface of the wire harness in a state where the small diameter cylinder part of the grommet is expanded with an expanding jig. Adhesive tape is wrapped around and fixed.

Instead of fixing with the adhesive tape, the present applicant has disclosed in Japanese Patent Laid-Open No. 2005-65354 a wire harness in which a grommet 101 and a wire harness 102 are fixed using a binding band 100 as shown in FIG. The grommet mounting structure is provided.
Further, recently, in hybrid vehicles and electric vehicles, as shown in FIG. 10, a grommet 120 is externally fitted to a pipe harness 110 in which a wire harness 102 routed under the floor of the vehicle is passed through a metal pipe 111. In some cases, the grommet 120 is mounted in a through hole provided in the floor panel. In the grommet attached to this pipe harness, as shown in FIGS. 10A and 10B, a binding band 130 made of a resin molded product is wound around the outer periphery of the small-diameter cylindrical portion 121 of the grommet 120, and the small-diameter cylindrical portion 121 is made of metal. The pipe 111 is strongly fastened to the outer peripheral surface.

  More specifically, a pair of annular ribs 122A and 122B are provided on the outer peripheral surface of the grommet 120 on the distal end side of the small-diameter cylindrical portion 121, and a band winding portion 124 is provided between the ribs 122A and 122B. 130 band 131 is wound, and the band 131 is passed through the main body 133 and pulled to lock the locking piece of the main body 133 into the locking groove of the band 131 and fix it.

  The grommet is formed of an elastic material made of rubber or elastomer as described above, and the thickness of the small-diameter cylindrical portion is thin in order to adhere to the outer peripheral surface of the pipe 111 on the outer periphery of the wire harness. On the other hand, since the binding band is made of a resin molded product, if the band 131 is pulled strongly at the time of fastening, the metal pipe 111 may slip easily. As shown in FIG. 10B, the small diameter cylindrical portion 121 of the grommet The band winding portion 124 is pulled by the band 131, and the gap G is easily generated between the small diameter cylindrical portion 121 and the pipe 111. When such a gap G is generated, there is a possibility that water may enter the vehicle interior from under the floor through the gap G.

  In order not to generate the gap G, as shown in FIG. 10 (C), even if the seal lip 125 protrudes in an annular shape on the inner peripheral side of the band winding portion 124 of the small diameter cylindrical portion 121 of the grommet, When the portion 124 is pulled by the band 131, the seal lip 125 is also pulled, and the generation of the gap G cannot be reliably prevented. Therefore, as shown in FIG. 10 (D), the outer diameter of the pipe 111 is set so that no gap is formed between the inner peripheral surface of the small-diameter cylindrical portion of the grommet and the outer peripheral surface of the pipe 111 at the band winding portion 124. The inner diameter of the small-diameter cylindrical portion 121 of the grommet is the same diameter so that no gap is generated.

  However, as described above, if the outer diameter of the pipe 111 is the same as the inner diameter of the small diameter cylindrical portion 121 of the grommet, the outer peripheral surface of the pipe is the small diameter cylindrical portion at the time of passing the pipe 111 through the small diameter cylindrical portion 121 of the grommet. The work cannot be carried out smoothly by sticking to the inner peripheral surface of the. Therefore, the lubricant 140 is filled between the pipe 111 and the small diameter cylindrical portion 121. However, when the lubricant 140 is filled, when the band 131 of the binding band 130 is wound around the outer peripheral surface of the small-diameter cylindrical portion 121, the pipe 111 slips due to the lubricant 140, and even if the band 131 is fastened, the small-diameter cylindrical portion 121 is piped. There is a problem that the positioning cannot be accurately fixed at a predetermined position 111.

JP 2005-65354 A

  The present invention has been made in view of the above problems, and when inserting a wire harness that is inserted through a metal pipe into close contact with a small-diameter cylindrical portion of a grommet without using a lubricant, A gap that can easily pass through the pipe and that does not cause slippage between the pipe and the small-diameter cylindrical portion when the small-diameter cylindrical portion of the grommet fitted on the pipe is fastened with a cable tie, and causes water intrusion. It is an issue to provide a grommet that does not generate any problems.

In order to solve the above-mentioned problem, as a first invention , a grommet that is externally fitted to a pipe harness in which a wire harness is inserted into a metal pipe,
Includes a small-diameter cylindrical portion for inserting in close contact with the pipe harness, the inner diameter of the small diameter tubular portion (B) is increased by the allowable tolerances dimension than the outside diameter (A) of the pipe (alpha), of the small-diameter cylindrical portion A pair of annular ribs are projected in the axial direction on the outer peripheral surface on the tip opening side, and a portion sandwiched between the annular ribs is a band winding portion of a binding band ,
Or One, the entire surface of the outer peripheral surface of the band winding portions twice the thickness thicker in other parts of the small-diameter cylindrical portion by padding, or, at intervals in the axial direction on the outer peripheral surface an annular A rib is provided so as to provide a thick wall portion, or it is branched from the back end side in the axial direction of the band winding portion so that the branch inner cylinder portion is located along the inner peripheral side of the band winding portion. Provided with a thick-walled portion by overlapping a branched inner cylindrical portion on the inner peripheral surface of the band winding portion ,
When the band of the binding band is wound around the band winding portion and pulled, the band winding portion is prevented from being pulled outward, and the inner circumferential surface of the small-diameter cylindrical portion in the region to be the band winding portion is annular. A grommet characterized by protruding a sealing lip is provided.

As described above, the band winding portion of the small-diameter cylindrical portion is made thick so that the band winding portion sticks to the inner peripheral surface of the band when the binding band wound around the band winding portion is pulled outward. I try not to be pulled. Therefore, it is possible to prevent the seal lip projecting from the inner peripheral surface of the band winding portion from being pulled outward together with the band winding portion and leaving a gap from the outer peripheral surface of the pipe. And since the seal lip is protrudingly provided on the inner peripheral surface of the band winding part fastened with the binding band, the seal lip can be pressed against the outer peripheral surface of the pipe with a strong force.
In addition, the inner diameter (B) of the small-diameter cylindrical portion is (A + α) and α is larger than the outer diameter A of the pipe, so that the pipe can be inserted through the small-diameter cylindrical portion without using a lubricant. Lubricant filling work can be eliminated.

As described above, the band winding portion is thick as the following three shapes.
In the first shape, the entire outer peripheral surface of the band winding portion sandwiched between the annular ribs is built up to have a thickness that is twice as thick as the other portions of the small diameter cylindrical portion . However, the annular ribs on both sides in the axial direction of the winding portion protrude outward from the band winding portion.
In the second shape, the thick portion is provided by projecting the annular rib on the outer peripheral surface of the band winding portion sandwiched between the annular ribs with an interval in the axial direction.
When it is set as the said 1st and 2nd shape, it is preferable to protrude one said seal lip in the inner peripheral surface side of the band winding part.
The third shape is provided by branching from the back end side in the axial direction of the band winding portion so that the branch inner cylinder portion is positioned along the inner peripheral side of the band winding portion, and the band winding portion A thick inner part is formed by overlapping the branched inner cylinder part on the inner peripheral surface of the inner part.
If the shape of the third, preferably Rukoto have the sealing lip provided on the protruding end of the branch in the cylinder portion.

Thus, the said 1st shape is made into the shape which provided the thickness of the band winding part in the whole axial direction and the circumferential direction. The said 2nd shape is made into the shape which divided | segmented and provided in the circumferential direction the thickness of the band winding part. The third shape is a shape provided by dividing the thick portion of the band winding portion in the axial direction.
If it is set as the said 2nd, 3rd shape, since the flexibility of a band winding part can be improved, the insertion workability | operativity of the pipe harness to the small diameter cylinder part of a grommet can be made easy.

  The thickness of the small-diameter cylindrical portion of the grommet is 1 mm to 4 mm, and in the thick-walled portion having the first, second, or third shape, 1 mm to 4 mm is added to the thickness of the small-diameter cylindrical portion, and the total thickness Is set to 2 mm to 8 mm.

According to a second aspect of the present invention , there is provided a grommet for a pipe harness in which a plurality of electric wires connecting a battery and an inverter or an inverter and a motor of a hybrid vehicle or an electric vehicle are inserted into an aluminum-based metal pipe. The grommet is a two-piece grommet in which a grommet body made of rubber or elastomer is combined with a resin inner made of a resin molded product, and is attached to a through hole formed in the panel.
The grommet body is provided in close contact with the pipe harness, the small-diameter cylindrical portion, a large-diameter closing wall continuous to the outer periphery of the opening of the small-diameter cylindrical portion, and protruding from the outer peripheral edge of the closing wall. It has a peripheral wall provided with a locking part consisting of an annular recess for inserting and locking the resin inner,
The inner diameter (B) of the small-diameter cylindrical portion is larger than the outer diameter (A) of the pipe by an allowable tolerance dimension (α), and a pair of a pair of small-diameter cylindrical portions is formed in the axial direction on the outer peripheral surface on the tip opening side. An annular rib is projected, a portion sandwiched between the annular ribs is used as a band winding portion of a thick binding band, and an annular seal is formed on the inner peripheral surface of the small-diameter cylindrical portion in the region to be the band winding portion. It has a lip protruding,
The resin inner has a flange inserted and locked to the locking portion, an annular frame protruding from the inner peripheral edge of the flange, and a plurality of locks for fixing through holes provided in the annular frame at intervals in the circumferential direction. Have nails,
The other end of the small diameter cylindrical portion of the grommet body protrudes from the tip of the annular frame of the resin inner, and provides a grommet having the band winding portion provided on the outer periphery of the protruding portion .

Further, the small-diameter cylindrical portion of the grommet may be provided in parallel with a plurality of pipes such as two in accordance with the number of pipe harnesses penetrating.
Furthermore, the small-diameter cylindrical portion may be continuously provided with an inclination with respect to the closing wall according to the direction in which the pipe harness is routed.

  The shape of the grommet is not limited to the above shape, and the grommet is only a grommet body made of the rubber or the like, and the grommet body has an annular body locking recess that locks in a through hole formed in the body panel. It is good also as a shape which has the large diameter cylinder part provided in and the said small diameter cylinder part continuous with this large diameter cylinder part.

  In the grommet for a pipe harness of the present invention, when the band is pulled when the binding band is wound by increasing the thickness of the band winding portion of the small diameter cylindrical portion of the grommet to be in close contact with the pipe outer peripheral surface of the pipe harness. In addition, since the small-diameter cylindrical portion is prevented from being caught by the band, it is possible to prevent a gap from being generated between the small-diameter cylindrical portion of the grommet and the pipe, and to improve the water stop performance. In other words, since the band winding portion is prevented from being pulled by the band, when a seal lip is provided on the inner peripheral surface of the band winding portion, the seal lip is brought into close contact with the outer peripheral surface of the pipe for sealing. be able to. Therefore, the inner diameter of the band winding portion and the outer diameter of the pipe need not be the same, and the pipe harness can be easily passed through the small-diameter cylindrical portion of the grommet without filling the lubricant.

It is a front view which shows 1st Embodiment of this invention and shows the state which attached the grommet to the pipe harness and was mounted | worn with the through-hole of the floor panel. The grommet of the said 1st Embodiment is shown, (A) is a principal part enlarged view, (B) is a bottom view, (C) is a top view. (A) and (B) are the principal part expanded sectional views of the small diameter cylinder part of the said grommet. It is sectional drawing of a binding band. It is a fragmentary sectional view which shows the state which fastened the small diameter cylinder part to the pipe harness with the binding band. (A) (B) is principal part sectional drawing of the grommet of 2nd Embodiment. (A) (B) is principal part sectional drawing of the grommet of 3rd Embodiment. It is sectional drawing of the grommet of 4th Embodiment. It is drawing which shows a prior art example. (A)-(D) are drawings which show another prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a grommet according to the first embodiment.
The grommet 1 is a grommet of a pipe harness 5 in which a plurality of electric wires 2 that connect a battery and an inverter or an inverter and a motor of a hybrid vehicle or an electric vehicle are inserted into a pipe 3 made of an aluminum-based metal. The grommet 1 is attached to a through hole H formed in the floor panel P.

  As shown in FIG. 2, the grommet 1 is a two-piece grommet in which a grommet body 6 made of rubber or elastomer is combined with a resin inner 7 made of a resin molded product. The grommet body 6 has two small-diameter cylindrical portions 10 (10A, 10B) that are closely fitted to the two pipe harnesses 5 and externally fitted, and a large-diameter closed wall that continues to the outer periphery of one end opening 10a of the small-diameter cylindrical portion 10. 11 and a peripheral wall 12 projecting from the outer peripheral edge of the closed wall 11. The peripheral wall 12 is provided with an annular locking portion 13 comprising a recess for inserting and locking the resin inner 7 and a seal lip 14 projecting in the outer diameter direction from the tip of the annular locking portion 13. The resin inner 7 is provided with a flange 15 inserted and locked to the annular locking portion 13, an annular frame 16 projecting from the inner peripheral edge of the flange 15, and an annular frame 16 provided at an interval of 90 degrees in the circumferential direction. A lock claw 17 is provided for fixing the through hole.

  When the flange 15 of the resin inner 7 is inserted into the annular locking portion 13 of the grommet body 6 and the resin inner 7 is assembled to the grommet body 6, the annular frame 16 of the resin inner 7 protrudes from the inner peripheral side of the seal lip 14. The small diameter cylindrical portion 10 protrudes from the inner peripheral side of the annular frame 16.

  Two small-diameter cylindrical portions 10 provided in the grommet body 6 are inclined with respect to the closing wall 11, and one end opening 10 a of the small-diameter cylindrical portion 10 opening in the closing wall 11 is an elliptical opening as shown in FIG. It becomes. And the connection wall 18 of the two small diameter cylinder parts 10A and 10B in parallel is provided, and the inclination state of the small diameter cylinder part 10 is hold | maintained.

  As shown in FIG. 3, on the outer peripheral surface on the opening 10b side projecting outward of the small-diameter cylindrical portion 10, an annular rib 21 projecting with a dimension in the axial direction is provided with the annular rib 20 on the tip side, A portion sandwiched between the annular ribs 20 and 21 is a band winding portion 22. The entire outer peripheral surface of the band-wound portion 22 is built up so that the band-wound portion 22 is a thick portion, and is approximately twice as thick as the thickness (t) of the other portion of the small-diameter cylindrical portion 10. . The annular ribs 20 and 21 at both ends of the band-wound portion 22 made of the thick portion are protruded outward from the band-wound portion 22.

  An annular seal lip 24 projects from the inner peripheral surface of the band winding portion 22 at the center in the axial direction.

  The inner diameter B of the small-diameter cylindrical portion 10 is (A + α) obtained by adding an allowable tolerance dimension α to the outer diameter A of the pipe 3 of the pipe harness 5. The inner diameter C of the seal lip 24 is set to (A−α) obtained by subtracting an allowable tolerance dimension α from the outer diameter A of the pipe 3.

  As described above, the inner diameter B of the small-diameter cylindrical portion 10 is (A + α), which is larger than the outer diameter A of the pipe 3 by α, so that the pipe 3 can be easily attached to the small-diameter cylindrical portion 10 without using a lubricant. It can be inserted. Further, the inner diameter C of the seal lip 24 is set to (A−α), and the dimension is set such that the tip of the seal lip 24 is pressed against the outer peripheral surface of the pipe 3. These seal lips 24 are projected at an acute angle toward the projecting end so that the tip 24a can be easily bent.

The dimension (α) is adjusted according to the thickness (t) of the small-diameter cylindrical portion 10 and the outer diameter of the pipe 3, and is in the range of 0.1 mm to 5 mm.
Moreover, the wall thickness (t) of the small diameter cylinder part 10 shall be 1 mm-4 mm.

  After the pipe harness 5 is inserted into the small diameter cylindrical portion 10, the binding band 30 is wound around the band winding portion 22 of the small diameter cylindrical portion 10 and the small diameter cylindrical portion 10 is tightened to fix the attachment position of the grommet 1 to the pipe harness 5. The pipe harness 5 is fixed so as not to move. The binding band 30 is a general-purpose binding band made of a resin molded product similar to the binding band 130 shown in FIG. As shown in FIG. 4, the binding band 30 has a band 31 provided with a serrated continuous locking groove 31 a protruding from the fastening portion 32, and after the band 31 is wound around the band winding portion 22, the fastening portion The locking piece 32b protruding from the inner peripheral surface of the through hole 32a is locked to the locking groove 31a of the band 31 and fastened.

  The pipe harness 5 needs to be fastened by a binding band 30 after being inserted into the small diameter cylindrical portion 10 of the grommet 1 and fixed at a position where the grommet 1 is mounted in the through hole H of the floor panel P. In addition, in a state where the grommet 1 is mounted in the through hole H of the floor panel P, it is necessary to prevent the occurrence of water intrusion from the outside of the under-floor vehicle compartment from which the small diameter cylindrical portion 10 protrudes into the vehicle interior.

  The grommet 1 is attached to the pipe harness 5 by inserting the pipe harness 5 from the opening 10b of the small diameter cylindrical portion 10. At this time, since the inner diameter (B) of the small-diameter cylindrical portion 10 is larger than the outer diameter (A) of the pipe 3 by the dimension (α), the lubricant is used as the inner peripheral surface of the small-diameter cylindrical portion 10 or the outer peripheral surface of the pipe 3. Even if it is not applied, it can be inserted without difficulty. The tip 24a of the seal lip 24 of the small-diameter cylindrical portion 10 is pressed against the outer peripheral surface of the pipe 3, but the seal lip 24 is tapered and flexible on the tip side, so the seal lip 24 is easy Bend. Therefore, the pipe 3 can be inserted through the small diameter cylindrical portion 10 while pressing the seal lip 24 against the outer peripheral surface of the pipe 3.

  After the pipe 3 is inserted through the small-diameter cylindrical portion 10, the band 31 of the binding band 30 is wound around the pipe winding portion 22 on the outer peripheral surface of the small-diameter cylindrical portion 10. After the band 31 is inserted into the through hole 32a of the fastening portion 32, it is pulled strongly, and the locking piece 32b protruding from the inner peripheral surface of the through hole 32a is locked to the locking groove 31a of the band 31 and fastened. When the band 31 is pulled, the band winding portion 22 is thick, so that it adheres to the inner peripheral surface of the band 31 and is pulled outward from the pipe 3 so that the inner peripheral surface of the small-diameter cylindrical portion 10 and the pipe 3 It is possible to prevent a large gap from occurring between them. In addition, since the band winding portion 22 is pressed against the outer peripheral surface of the pipe 3 by pulling the band 31, a seal lip 24 protruding from the inner peripheral surface of the band winding portion is securely attached to the outer peripheral surface of the pipe 3. Can be pressed against. Therefore, it is possible to prevent a gap from being generated on the side of the opening 10b of the small-diameter cylindrical portion 10 and water from entering the grommet 1.

  Further, when the small-diameter cylindrical portion 10 is fastened to the pipe 3 of the pipe harness 5 by the binding band 30, since the lubricant is not filled between the small-diameter cylindrical portion 10 and the pipe 3, as described above, There is no slip between the tube portion 10 and the pipe 3, and the small diameter tube portion 10 can be fixed at the set position of the pipe 3. As described above, when the pipe harness 5 is inserted into the small-diameter cylindrical portion 10 of the grommet 1 without using a lubricant, it is possible to greatly improve the grommet assembly property to the pipe harness.

FIG. 6 shows a grommet according to the second embodiment.
In the second embodiment, the thick portion of the band-wound portion 22 provided on the outer peripheral surface of the small-diameter cylindrical portion 10 of the grommet 1 is a thick portion 22a composed of two annular ribs protruding in parallel with an interval in the axial direction. And 22b. The protruding height of the thick portions 22a and 22b is the same as the height of the thick portion of the band winding portion 22 of the first embodiment. The proportion of the thick portions 22a and 22b is 40% or more of the band winding portion 22.
Other configurations including the configuration in which the seal lip 24 protrudes from the inner circumferential surface of the band winding portion 22 are the same as those in the first embodiment, and thus the same reference numerals are given and the description thereof is omitted.

Also in the grommet of the second embodiment, the band winding portion 22 is provided with thick portions 22a and 22b, and a gap 22c between the thick portions 22a and 22b and between the annular ribs 20 and 21 at both ends. Therefore, when the band of the binding band is wound and pulled, it can be prevented that the band is stuck to the inner peripheral surface of the band and pulled outward.
Furthermore, since the small diameter cylindrical portion 10 is provided with the thick portions 22a and 22b at intervals in the axial direction in the band winding portion 22, it can be easily bent when the pipe 3 is inserted into the small diameter cylindrical portion 10, and Since the inner diameter B of the small diameter cylindrical portion 10 is A + α, the insertion workability can be improved. Therefore, similarly to the first embodiment, it is possible to eliminate the need for applying a lubricant for improving the workability of pipe passage.

FIG. 7 shows a grommet according to the third embodiment.
In the third embodiment, similarly to the first and second embodiments, the band winding portion 22 is provided between the annular ribs 20 and 21 protruding from the outer periphery of the small-diameter cylindrical portion 10. The band winding portion 22 is provided so as to be branched from the innermost side of the band winding portion 22 so as to be located along the inner peripheral side of the band winding portion 22. The branched inner cylinder portion 26 is continuous with the small-diameter cylinder portion 10 on the back side, and is inclined inward from the portion where the band winding portion 22 is provided.
The branch inner cylinder part 26 overlaps with the inner peripheral surface of the band winding part 22 on the outer cylinder side, thereby forming a band winding part as a thick part 28 as a whole. Further, the inner diameter B of the small-diameter cylindrical portion 10 is set to A + α similarly to the first and second embodiments even if the branched inner cylindrical portion 26 is provided.

  Further, the length of the branch inner cylinder portion 26 is set such that the tip of the branch inner cylinder portion 26 is located at the center of the axial length of the band winding portion 22 on the outer cylinder side, and the branch inner cylinder The thickness of the portion 26 is the same as the thickness (t) of the small diameter cylindrical portion 10. Further, a seal lip 24 is projected from the projecting end of the branched inner cylindrical portion 26. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

Also in the grommet of the third embodiment, the branched inner cylinder part 26 is provided on the inner peripheral surface of the band winding part 22 on the outer cylinder side, and the band winding part is set to be a thick part 28 in a stacked state. When the band of the binding band is wound and pulled, the band winding portion 22 can be prevented from sticking to the inner peripheral surface of the band and being pulled outward. Further, even if the band winding portion 22 of the outer cylinder portion sticks to the band and is pulled outward, the branch inner cylinder portion 26 is not pulled outward, and the seal lip 24 at the tip of the branch inner cylinder portion 26 is Since it abuts on the outer peripheral surface of the pipe 3, it is possible to prevent the occurrence of a gap that causes water immersion.
Furthermore, since the band winding portion on the outer cylinder side which is not thick and the branched inner cylinder part 26 are overlapped and thickened, the pipe 3 is connected to the small diameter cylinder part 10 as compared with the case where the wall is integrally thickened. Can be easily bent when inserted. And since the internal diameter of this branch inner cylinder part 26 is set to A + (alpha), insertion workability | operativity can be improved. Therefore, similar to the first and second embodiments, it is possible to dispense with the application of a lubricant for improving the pipe workability.

FIG. 8 shows a grommet according to the fourth embodiment.
The grommet is an integral grommet formed of an elastomer and is different from the two-body grommet using the resin inner of the first to third embodiments.
In the grommet 1, a large diameter cylindrical portion 40 is continuously provided at one end of the small diameter cylindrical portion 10, and a vehicle body locking concave portion 41 is annularly provided on the large diameter side outer peripheral surface of the large diameter cylindrical portion 40. A band winding portion 22 similar to that of the first embodiment is provided on the small diameter cylindrical portion 10 protruding from the continuous end of the enlarged diameter cylindrical portion, the band winding portion is thick, and the band winding portion 22 A seal lip 24 projects from the center of the inner peripheral surface.
Since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Electric wire 3 Pipe 5 Pipe harness 10 Small diameter cylinder part 20, 21 Annular rib 22 Band winding part 24 Seal lip 30 Binding band 31 Band

Claims (3)

A grommet that fits externally into a pipe harness in which a wire harness is inserted into a metal pipe,
Includes a small-diameter cylindrical portion for inserting in close contact with the pipe harness, the inner diameter of the small diameter tubular portion (B) is increased by the allowable tolerances dimension than the outside diameter (A) of the pipe (alpha), of the small-diameter cylindrical portion A pair of annular ribs are projected in the axial direction on the outer peripheral surface on the tip opening side, and a portion sandwiched between the annular ribs is a band winding portion of a binding band ,
Or One, the entire surface of the outer peripheral surface of the band winding portions twice the thickness thicker in other parts of the small-diameter cylindrical portion by padding, or, at intervals in the axial direction on the outer peripheral surface an annular A rib is provided so as to provide a thick wall portion, or it is branched from the back end side in the axial direction of the band winding portion so that the branch inner cylinder portion is located along the inner peripheral side of the band winding portion. Provided with a thick-walled portion by overlapping a branched inner cylindrical portion on the inner peripheral surface of the band winding portion ,
When the band of the binding band is wound around the band winding portion and pulled, the band winding portion is prevented from being pulled outward, and the inner circumferential surface of the small-diameter cylindrical portion in the region to be the band winding portion is annular. Grommet characterized by protruding a sealing lip. A grommet for a pipe harness in which a plurality of electric wires connecting a battery and an inverter or an inverter and a motor of a hybrid vehicle or an electric vehicle are inserted into an aluminum-based metal pipe, and the grommet is a through hole formed in a floor panel The grommet is a two-piece grommet in which a grommet body made of rubber or elastomer is combined with a resin inner made of a resin molded product,
The grommet main body is a small-diameter cylindrical portion that fits closely to the pipe harness, a large-diameter closing wall that continues to the outer periphery of the opening of the small-diameter cylindrical portion, and a protrusion projecting from the outer peripheral edge of the closing wall. It has a peripheral wall provided with a locking part consisting of an annular recess for inserting and locking the inner,
The inner diameter (B) of the small-diameter cylindrical portion is larger than the outer diameter (A) of the pipe by an allowable tolerance dimension (α), and a pair of a pair of small-diameter cylindrical portions is formed in the axial direction on the outer peripheral surface on the tip opening side. An annular rib is projected, a portion sandwiched between the annular ribs is used as a band winding portion of a thick binding band, and an annular seal is formed on the inner peripheral surface of the small-diameter cylindrical portion in the region to be the band winding portion. It has a lip protruding,
The resin inner has a flange inserted and locked to the locking portion, an annular frame protruding from the inner peripheral edge of the flange, and a plurality of locks for fixing through holes provided in the annular frame at intervals in the circumferential direction. Have nails,
A grommet in which the other end of the small-diameter cylindrical portion of the grommet body protrudes from the tip of the annular frame of the resin inner, and the band winding portion is provided on the outer periphery of the protruding portion . Depending on the number of pipe harnesses penetrating, the grommet has one or more pipes, and the plurality of small diameter cylinders are provided in parallel, and the parallel small diameter cylinders are connected by a connecting part. grommet of claim 2 has.

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