JP2013021791A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet having a small diameter cylindrical part in an inclined state through which a wire harness is inserted such that the small diameter cylindrical part does not interfere with a resin inner.SOLUTION: The grommet is a grommet of two-body objects comprising a grommet body made of rubber or elastomer, and the resin inner formed of a resin molding. The grommet body includes a closed end wall provided in a manner projecting from an outer circumference of the small diameter cylindrical part through which the wire harness is inserted in tight adhesion, an engagement part formed of an annular recess that has the resin inner inserted in and engaged with a peripheral wall continuous to an outer circumference edge of the closed end wall, and the small diameter cylindrical part projecting from the closed end wall. The resin inner includes an annular frame projecting from an inner circumference edge of a flange which is inserted in and engaged with the engagement part, and a lock claw provided on the annular frame in a circumferential direction at an interval such that the annular frame projects by smaller projection amount so as not to interfere with the inclined small diameter cylindrical part as well as the lock claw is further projected from a projecting end of the annular frame before folded outward.

Description

  TECHNICAL FIELD The present invention relates to a grommet, and more specifically, a grommet that is externally fitted to a wire harness routed in an automobile and is attached to a through-hole of a vehicle body panel to prevent intrusion of water, dust, and abnormal noise from the outside of the passenger compartment into the passenger compartment. About.

This type of grommet for a wire harness includes a single grommet formed of rubber or elastomer, a two-piece grommet including a grommet body molded of rubber or elastomer, and a resin inner to be assembled to the grommet body. .
The one-piece grommet has the advantage that the manufacturing cost can be reduced compared to the two-piece grommet, whereas the two-piece grommet has a lock claw provided on the resin inner part locked in the through hole of the vehicle body panel. Since it attaches, it has an advantage that there is a feeling of moderation when the lock claw is locked.

  As a two-piece grommet provided with the resin inner, the present applicant has provided a grommet with a resin inner shown in FIG. 7 in Japanese Patent Laid-Open No. 2003-111251. The grommet 100 is formed by inserting a locking collar 111 of a resin inner 110 into an annular recess 103 of a large diameter cylindrical section 102 provided on a grommet body 101 made of rubber or elastomer, and protruding from the inner periphery of the locking collar 111. A fixed claw (lock claw) 113 is provided on the peripheral wall 112. The fixed claw 113 is not projected from the projecting end 112 a of the peripheral wall 112, but is folded back from the outer surface of the projecting end of the peripheral wall 112. Further, the small diameter cylindrical portion 104 protrudes from the annular recess 103 of the large diameter cylindrical portion 102 of the grommet body 101. The wire harness inserted through the small-diameter cylindrical portion 104 is pulled out straight through the peripheral wall 112 of the resin inner 110, and the grommet 100 passes the fixing claw 113 after passing the peripheral wall 112 of the resin inner 110 through the through hole H of the vehicle body panel P. The seal lip 105 that is locked to the periphery of the through hole H and provided on the outer surface of the large-diameter cylindrical portion 102 of the grommet body 101 is pressed against the vehicle body panel P at the periphery of the through hole H.

Japanese Patent Laid-Open No. 2003-111251

  In the grommet of Patent Literature 1, the wire harness 130 drawn from the inside of the peripheral wall 112 of the resin inner 110 is normally drawn in the axial direction of the resin inner 110 as shown in FIG. Therefore, the wire harness 130 drawn out from the resin inner 110 does not interfere with the peripheral wall 112 and the fixing claw 113 provided on the outer surface of the peripheral wall 112.

However, when the wire harness 130 pulled out from the inside of the peripheral wall 112 of the resin inner 110 of the grommet is inclined at a large angle θ with respect to the axis L of the peripheral wall 112 as shown in FIG. 112 has a problem that the wire harness 130 interferes. As described above, when the wire harness 130 interferes with the peripheral wall 112, if the peripheral wall 112 is deformed by pressing by the wire harness 130, the locking function by the fixing claw 113 and the sealing performance by the seal lip 105 may be deteriorated.
In particular, as shown in FIG. 8C, when the wire harness is a pipe harness 150 inserted into a pipe, the pipe is not deformed and the grommet 100 side is deformed, and the locking function and sealing performance of the grommet may be reduced. Sexuality increases.

  The present invention has been made in view of the above problems, and in a two-piece grommet in which a grommet body is combined with a resin inner, when the wire harness is inserted while being inclined with respect to the axis of the peripheral wall of the resin inner, It is an object of the present invention to eliminate interference with the peripheral wall and ensure that the grommet can be securely fixed to the through hole of the vehicle body panel with a fixing claw protruding from the peripheral wall of the resin inner.

In order to solve the above problems, the present invention 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 body has a closed end wall projecting from the outer periphery of a small diameter cylindrical portion that is inserted in close contact with the wire harness, and an annular recess that inserts and locks the resin inner to the peripheral wall continuous to the outer peripheral edge of the closed end wall. The small diameter cylindrical portion protrudes in an inclined manner with respect to the closed end wall.
The resin inner is provided with an annular frame projecting from the inner peripheral edge of a flange that is inserted and locked into the locking portion, and a locking claw for locking the vehicle body is provided on the annular frame at a circumferential interval. Provided is a grommet characterized in that the amount of protrusion is reduced so as not to contact the inclined small-diameter cylindrical portion, and the lock claw is further protruded from the protruding end of the annular frame and then folded outward. doing.

  It is preferable that the annular frame is provided with a concave portion that protrudes in a concave shape on the inner peripheral side at a portion where the lock claw is provided, and a notched portion of the lock claw is located in the concave portion.

Since the small-diameter cylindrical portion of the grommet is inclined, the small-diameter cylindrical portion interferes with the protruding end of the annular frame if the protruding height in the axial direction of the annular frame of the resin inner is the same as the conventional one.
In the present invention, as described above, the lock claw is further protruded from the protruding end of the resin inner annular frame, so that the height of the annular frame is made lower than the conventional one. As a result, the inclined small-diameter cylindrical portion is prevented from contacting the annular frame, and the lock claw is further protruded from the lowered annular frame, so that the height of the locking surface of the lock claw is the same as the conventional one. And can be accurately locked to the periphery of the through hole of the vehicle body panel.

  Four lock claws provided on the annular frame of the resin inner are provided at intervals of 90 degrees. These lock claws continuously project the support portion from the projecting end of the annular frame, incline outwardly from the tip of the support portion, fold it back, and use the bottom surface of the folded tilt end as a locking surface. A locking piece protrudes from the inner end of the surface. The locking claw locking piece abuts on the inner peripheral surface of the through hole of the vehicle body panel, and the locking surface abuts on the inner peripheral edge of the through hole to fix the grommet to the through hole. The amount of protrusion of the support portion of the lock claw corresponds to a dimension in which the annular frame is lowered.

Further, as described above, the resin inner annular frame protrudes in a concave shape on the inner peripheral side at the portion where the lock claw is provided, and the surface side is notched, and the folded portion of the lock claw is formed on the notched portion. Is located.
With this configuration, the amount of outward protrusion of the lock claw is reduced so that it can be easily engaged with the periphery of the through hole, and the lock claw can be easily bent and attached to the through hole of the grommet.

It is preferable that the wire harness inserted through the inclined small diameter cylindrical portion of the grommet is a pipe harness inserted through a metal pipe, and is used as a grommet for the pipe harness.
As described above, when the pipe harness is used as a grommet for a pipe harness and is inserted through the inclined small-diameter cylindrical portion, the resin inner is deformed when the pipe harness comes into contact with the annular frame of the resin inner, thereby inhibiting the locking claw locking function. Therefore, the grommet of the present invention in which the resin inner is not brought into contact with the pipe harness is preferably used.

  The grommet of the present invention is 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 metal pipe, and the grommet is a floor. It is mounted in a through hole formed in the panel.

  Further, the inclined small-diameter cylindrical portions may be two, and the two small-diameter cylindrical portions may be connected in parallel by a thick-walled connecting portion. Furthermore, you may protrude one long cylindrical part which gathered the several small diameter cylindrical part from the said closed end wall.

  In the grommet of the present invention, since the lock claw is further protruded from the protruding end of the resin inner annular frame and the height of the annular frame is lowered, the inclined small-diameter cylindrical portion contacts the annular frame. By providing a lock claw that protrudes further from the lowered annular frame, the lock claw's locking surface can be made the same height as in the prior art and accurately locked to the periphery of the through hole in the vehicle body panel. be able to.

It is a front view which shows the state which attached the grommet of 1st Embodiment of this invention to the wire harness, and was mounted | worn with the through-hole of the vehicle body panel. The said grommet is shown, (A) is principal part sectional drawing, (B) is a bottom view, (C) is a top view. (A)-(C) are perspective views of the resin inner of the said grommet. It is sectional drawing which expands and shows the lock nail | claw of the said resin inner. It is a front view of the attachment state of the grommet of a 2nd embodiment. (A) and (B) are perspective views of the grommet of the second embodiment. (A)-(C) are drawings which show a prior art example. (A)-(C) are drawings explaining the problem of a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show the grommet of 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.

The grommet 1 is a two-piece grommet in which a grommet body 6 made of rubber or elastomer and a resin inner 7 made of a resin molded product are combined.
As shown in FIG. 2, the grommet body 6 is provided on the outer periphery of two small-diameter cylindrical portions 10 (10 </ b> A and 10 </ b> B) that are closely fitted to the two pipe harnesses 5 and one end opening 10 a of the small-diameter cylindrical portion 10. A large-diameter cylindrical portion 11 is provided that includes a large-diameter closed end wall 12 that is continuous and a peripheral wall 13 that protrudes from the outer peripheral edge of the closed end wall 12. The peripheral wall 13 is provided with an annular locking portion 14 formed of a recess for inserting and locking the resin inner 7, and a seal lip 15 protruding in the outer diameter direction from the tip of the annular locking portion 14. The resin inner 7 is provided with a flange 16 inserted and locked to the annular locking portion 14, an annular frame 17 projecting from the inner peripheral edge of the flange 16, and an annular frame 17 spaced 90 degrees in the circumferential direction. And a lock claw 20 for fixing the through hole.

  The small-diameter cylindrical portion 10 of the grommet body 6 includes two small-diameter cylindrical portions 10A and 10B, which are arranged side by side and are inclined with respect to the axis L of the large-diameter cylindrical portion 11. The inclination angle θ is about 45 degrees with respect to the axis L in the grommet of this embodiment.

  Since the two small-diameter cylindrical portions 10A and 10B arranged side by side are inclined with respect to the axis L, the openings 10Ah and 10Bh of the closed end wall 12 are elliptical openings as shown in FIG. And it is unevenly distributed in one side part of the closed end wall 12, and the protrusion part of small diameter cylinder part 10A, 10B adjoins the surrounding frame 13 and the annular frame 17 of the resin inner 7 on the opposite side to opening.

  As shown in FIG. 2B, the thick connecting portion 18 is provided between the two small-diameter cylindrical portions 10A and 10B arranged in parallel, and the inclined state of the small-diameter cylindrical portions 10A and 10B is maintained. A pair of annular ribs 29 project in the axial direction on the outer peripheral surface of the small-diameter cylindrical portions 10A, 10B projecting outward from the opening 10b, and a portion sandwiched between the annular ribs 29 is a binding band 30. It is set as the winding part 32.

  As described above, since the small-diameter cylindrical portion 10 (10A, 10B) is inclined and is close to a part of the annular frame 17 of the resin inner 7, as shown in FIG. The dimensions are shortened, the projecting dimension (H) from the flange 16 is shortened, and the height of the annular frame 17 is lowered so as not to interfere with the small diameter cylindrical portion 10.

  However, the positional relationship between the seal lip 15 of the grommet body 6 and the locking surface 21 of the lock claw 20 needs to be a constant dimension corresponding to the plate thickness of the vehicle body panel P. Therefore, the lock claw 20 provided at the projecting end of the annular frame 17 having a lowered height (H) continuously projects the support portion 20a from the projecting end 17a of the annular frame 17 as shown in FIG. The bottom surface bent inward from the tip of the portion 20a is bent back, and the bottom surface refracted inward from the tip of the folded inclined portion 20b is defined as a locking surface 21, and the dimensions of the locking surface 21 and the seal lip 15 are set to a predetermined constant. Holds to dimensions. Further, a locking piece 22 projects from the inner end of the locking surface 21. The locking piece 22 of the lock claw 20 contacts the inner peripheral surface of the through hole H of the vehicle body panel (floor panel P), and the locking surface 21 contacts the inner peripheral edge of the through hole H, so that the grommet 1 is passed through the through hole. It shall be fixed to H.

  Further, the annular frame 17 of the resin inner 7 is provided with a recess 23 that protrudes in a concave shape on the inner peripheral side at a portion where the lock claw 20 is provided and is cut out on the surface side. The folded inclined portion 20b is positioned.

  The grommet 1 is assembled by inserting the flange 16 of the resin inner 7 into the annular locking portion 14 of the peripheral wall 13 of the grommet body 6. When the grommet body 6 and the resin inner 7 are assembled, the lock claw 20 is not positioned at a position corresponding to the inclined protruding side of the small-diameter cylindrical portions 10A and 10B, and the annular frame 17 having a low height is positioned and assembled. .

  After the pipe harness 5 is inserted into the small diameter cylindrical portion 10 (10A, 10B) of the grommet 1 in which the resin inner 7 and the grommet body 6 are assembled as described above, the grommet 1 is bound by the binding band 30 and the grommet 1 is connected to the pipe harness 5. It is attached to. At that time, the small-diameter cylindrical portion 10 inserted through the pipe harness 5 is hard and rigid. If the small-diameter cylindrical portion 10 comes into contact with the annular frame 17 and the lock claw 20, they may be deformed or damaged. is there. However, since the small-diameter cylindrical portion 10 is not brought into contact with the annular frame 17 and the lock claw 20, the occurrence of the problem can be prevented.

  As described above, with the grommet 1 attached to the pipe harness 5, the grommet 1 is inserted into the through hole H of the floor panel P, and the lock claw 20 of the resin inner 7 is locked to the through hole H and the seal lip 15 Is pressed against the periphery of the through hole H. Thereby, the grommet 1 is attached to the floor panel P in a state in which the occurrence of water intrusion from the outside of the passenger compartment on the lower floor side where the small-diameter cylindrical portion 10 protrudes into the passenger compartment is prevented.

  When locking the lock claw 20 of the resin inner 7 to the through hole H, the annular frame 17 is provided with a recess 23, and the lock claw 20 is positioned in the recess 23, thereby reducing the outward protrusion amount. The locking force of the lock claw 20 can be reduced.

The grommet of 2nd Embodiment is shown in FIG.5 and FIG.6.
The second embodiment is different from the first embodiment in that the small-diameter cylindrical portion 10 is further protruded from the closed end wall 12. That is, it protrudes from the closed end wall 12 as one long cylindrical portion 10C in which two small diameter cylindrical portions 10A and 10B are assembled.
Specifically, the protruding end of the long cylindrical portion 10 </ b> C is folded back to the outer peripheral side, the folded outer cylinder portion 31 is continued to the closed end portion 12 of the large-diameter cylindrical portion 11, and the peripheral wall extends from the outer peripheral edge of the closed end wall 12. 13 is projected.

  The two small-diameter cylindrical portions 10A and 10B arranged in parallel to the long cylindrical portion 10C protrude outward from the inside surrounded by the peripheral wall 13. The small-diameter cylindrical portions 10A and 10B are inclined and arranged in parallel, and other configurations are the same as those in the first embodiment, including the configuration in which they are connected by the thick-walled connecting portion 18. Is omitted.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Wire harness 3 Pipe 5 Pipe harness 6 Grommet main body 7 Resin inner 10 Small diameter cylinder part 16 Flange 17 Annular frame 18 Thick connection part 20 Lock claw
30 Bundling band 32 Band winding part

Claims (4)

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 body has a closed end wall projecting from the outer periphery of a small diameter cylindrical portion that is inserted in close contact with the wire harness, and an annular recess that inserts and locks the resin inner to the peripheral wall continuous to the outer peripheral edge of the closed end wall. The small diameter cylindrical portion protrudes in an inclined manner with respect to the closed end wall.
The resin inner is provided with an annular frame projecting from the inner peripheral edge of a flange that is inserted and locked into the locking portion, and a locking claw for locking the vehicle body is provided on the annular frame at a circumferential interval. A grommet characterized in that the amount of protrusion is reduced so as not to contact the inclined small-diameter cylindrical portion, and the lock claw is further protruded from the protruding end of the annular frame and then folded outward.   2. The annular frame is provided with a concave portion that protrudes in a concave shape on the inner peripheral side at a portion where the lock claw is provided, and a notch is formed on the surface side, and the folded portion of the lock claw is positioned in the concave portion. Grommet.   The grommet according to claim 1 or 2, wherein the wire harness inserted through the inclined small-diameter cylindrical portion of the grommet is a pipe harness inserted through a metal pipe.   The grommet according to any one of claims 1 to 3, wherein the inclined small-diameter cylindrical portions are two, and the two small-diameter cylindrical portions are connected in parallel by a thick connecting portion.

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