JP4084273B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet attached to an opening provided in a panel.

  2. Description of the Related Art Conventionally, in a wire harness as an electric wire wired between a passenger compartment and an outside (for example, an engine compartment) in an automobile, an opening is provided in a panel forming the passenger compartment, and the opening is passed through the opening. For example, a grommet made of a rubber material is attached to the opening for soundproofing and waterproofing.

  As such a grommet, an annular sound insulator with a U-shaped cross section is inserted into the space of the grommet body to be engaged with the opening, and a liquid curable material for waterproofing is poured between the inner surface of the grommet body and the sound insulator. (For example, refer to Patent Document 1). Also, the grommet body attached to the opening of the panel, and each extending portion extending to the vehicle interior side and the exterior side with respect to the grommet body, respectively, the vehicle interior side extension portion is connected to the wire harness. Formed in a shape that has a large diameter so that it can be bent and wired, and has a hole with a slit for allowing the bent wire harness to pass through, with the inner diameter at which the external extension part can be fitted and adhered to the wire harness Some have been formed (for example, see Patent Document 2).

  For each of the above grommets, the grommets are formed in a substantially L shape, and for example, the wire harness is guided along the panel on the vehicle interior side to avoid interference with other components on the vehicle interior side. There is something.

  An example of such an L-shaped grommet is shown in FIG. In the figure, a grommet 31 is attached to an opening 4 a provided in a panel 4 that partitions the vehicle compartment 2 and the engine room 3 by engaging a circumferential groove 7 b provided on the outer periphery of the grommet main body 32, for example. . The grommet main body 32 is provided with an extension 33 that is formed in an L shape together with the grommet main body 32 so as to be along the panel 4 in the attached state, and a second extension is provided on the engine room 3 side. A portion 34 is provided. The wire harness 5 is inserted from the second extending portion 34 into the extending portion 33 through the grommet main body 32.

  In the case of such an L-shaped grommet, the operation of inserting the wire harness 5 into the grommet 31 becomes difficult. For example, when the extension portion 33 and the grommet main body 32 are provided with slits 35 as shown in FIG. good.

  When the operation of inserting the wire harness 5 through the L-shaped grommet 31 is performed, as shown in FIG. 10, a plurality of wires are wound from the second extending portion 34 side that is wound to the root and shortened in the axial direction. With the jig having the claw 13 inserted, the claw 13 is displaced in a direction away from each other by some sort of boosting mechanism with the tip of the claw 13 protruding from the slit 35, so that the extended portions 33, 34 are Expand. Thus, even if it is the L-shaped grommet 31, since the extension part 33 by the side which provided the slit 35 can be expanded without a problem by providing the slit 35, it is connected to the wire harness 5. Further, the portion swollen by the plurality of couplers 5a can be easily inserted into the grommet 31, and the work is easy.

Then, after the nail 13 is pulled out and removed, the grommet 31 is attached to the opening 4 a of the panel 4. In attaching the grommet 31 to the panel 4, as shown in FIG. 11, both side portions 32a of the slit 35 of the grommet main body 32 are opened to the left and right, and an arrow in the figure is shown at the opened portion. As shown in C, a finger is inserted and held, and the grommet main body 32 is pulled from the opening 4a toward the passenger compartment as shown by an arrow D in the figure. The grommet main body 32 is provided with, for example, a circumferential groove in an outer peripheral portion corresponding to the size of the opening 4a. By pulling the grommet body 32, the circumferential groove fits into an edge of the opening 4a and It is attached.
JP-A-10-126926 JP-A-8-212858

  In the thing of the said patent document 1, since a sound insulation body and a liquid sclerosing | hardenable substance are used for soundproofing and waterproofing, there exists a problem that an increase in a number of parts and the complexity of an operation | work will become expensive. Moreover, in the thing of patent document 2, the extension part by the side of a vehicle interior is formed in large diameter, and the hole for bending a wire harness through the large diameter peripheral wall is provided in two places, There is a problem that it is disadvantageous for soundproofing and waterproofing because a bent wire harness is passed through one of them, and there is a gap with the wire harness having a large diameter and an opening by the other hole.

  Further, in the illustrated example shown as the above conventional example, the inner diameter of both the extension part on the vehicle interior side and the outside side is a size that can be fitted to the wire harness, which is advantageous for soundproofing and waterproofing measures. Since the notch that can facilitate the attaching operation of the grommet is so long as to reach the grommet main body, there is a possibility that transmitted sound from the notch may be generated, and there is a problem that a countermeasure for that is required.

In order to solve such problems and realize a grommet that can be soundproofed and waterproofed with a simple structure and is easy to install, in the present invention, the electric wire (5) is passed through the panel (4). A grommet (1) that can be attached to an opening (4a) provided in the panel (4) and can put the electric wire (5) in an inserted state so that the grommet (1) can be wired in a state. A grommet body (7) having an engaging portion (7b) that can engage with (4a), and an insertion direction of the electric wire (5) from the grommet body (7) on at least one end side of the grommet body (7) And a second extension part (8) provided on the opposite side of the extension part (8) across the panel (4) of the grommet body (7). 9) and has the extending portion (8), the extension The notch (10) provided from the end toward the grommet main body (7) and the grommet main body (7) and the notch so as to be in close contact over the entire circumference in the circumferential direction of the inserted wire (5) (10) have a contact portion and (11) provided between the second extending portion (9) can be wound from the extending direction end side to a substantially radically wound radially outward It was assumed that it was formed to be thin .

  Thus, according to the present invention, continuous to the inner circumferential surface of the grommet body side (the root side of the extending portion) of the incision direction end of the incision provided in the extending portion in the wire insertion direction, over the entire circumference in the circumferential direction. By providing a close contact portion that can be in close contact with the outer periphery of the electric wire, the outer periphery of the electric wire can be brought into close contact state over the entire periphery by the close contact portion, so that sound and rainwater are generated from the gap between the outer periphery of the electric wire and the inner surface of the grommet Since leakage can be prevented, the soundproofing effect and waterproofing effect are great. In addition, since the cut is provided in the wire insertion direction in the extended portion, and the extended portion of the portion where the cut is provided can be greatly expanded, for example, when a coupler is connected to the tip of the wire ( In particular, when a plurality of couplers are connected to form a lump swollen than the electric wire, the insertion operation can be easily performed.

  Further, since the electric wire is passed through a panel that partitions the engine room and the vehicle compartment, when the electric wire picks up the vibration of the vibration source on the engine room side, the electric wire may slightly vibrate. Even in such a case, the minute vibration can be blocked by the contact portion. Accordingly, it is possible to prevent the vibration of some vibration source from being transmitted to the vehicle interior via the electric wire (outer skin) and causing slight vibration in the vehicle interior without using a special vibration isolator.

  In particular, it is preferable that a second extending portion having a close contact portion that can be in close contact with the inserted electric wire is provided on a side opposite to the extending portion of the grommet body. According to this, since it is possible to wrap the electric wire in close contact with each extending part on both sides of the panel, the soundproofing / waterproofing effect can be further improved.

  In addition, since the extending portion is formed so as to extend in a substantially right angle direction with respect to the grommet body, for example, the electric wire can be held in a bent state with a minimum bending radius, and the electric wire is allowed to run along the panel. Therefore, even if the layout is such that there are other parts in the vicinity of the extended portion, interference between the electric wire and the other parts can be avoided.

  Moreover, it is good to provide the holding | grip part which can be pulled in the insertion direction when attaching a grommet main body to opening in the outer surface of a grommet main body. According to this, when the grommet formed in a substantially L shape is attached to the opening of the panel by pulling toward the extension part side, even if it is difficult to grip the extension part, The gripping and pulling operation can be performed, and the grommet mounting workability is good.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cutaway side view of an essential part showing a state in which a grommet 1 according to the present invention is attached to a panel 4 that partitions a vehicle compartment 2 and an engine compartment 3 of an automobile. As shown in the drawing, in the grommet 1, a wire harness 5 is inserted as an electric wire disposed across the vehicle compartment 2 and the engine room 3. A plurality of couplers 5a are connected to the tip of the wire harness 5 (only the vehicle interior side is shown in the figure) corresponding to each cable. Further, a tape is wound around the outer periphery of the wire harness 5 at least in the range of the insertion portion to the grommet 1 in order to bundle a plurality of cables.

  The grommet 1 is made of, for example, an elastic material made of rubber, and is formed to have a large diameter that fits into an opening 4a provided in the panel 4 as shown in FIGS. A grommet body 7 having a cylindrical shape, a cylindrical extension 8 extending substantially perpendicular to the grommet body 7 so as to be substantially L-shaped together with the grommet body 7, and a panel 4 of the grommet body 7. It is formed in the shape which has the cylindrical 2nd extension part 9 provided in the side opposite to the said extension part 8 on both sides. Both the extending portions 8 and 9 are formed with an inner diameter that is smaller than the outer diameter of the tape winding portion of the wire harness 5 to be inserted, and communicate with each other through the empty chamber 6. The vacant chamber 6 is sufficiently large to allow the wire harness 5 to be bent.

  The outermost peripheral portion of the grommet main body 7 and the portion located on the engine room 3 side in the attached state is provided with an outward flange portion 7a having a diameter larger than that of the opening 4a, and the vehicle in the attached state of the outward flange portion 7a. On the chamber 2 side, a circumferential groove 7b is provided as an engaging portion formed to have substantially the same diameter as the opening 4a. The grommet 1 is attached to the panel 4 by the edges of the openings 4a entering the circumferential grooves 7b and engaging with each other. In addition, a lip 7c made of a circumferential ridge is formed on a portion of the outward flange portion 7a that contacts the surface of the panel 4 on the engine room 3 side in the mounted state, and the outward flange portion 7a and the lip 7c itself are elastically restored. The lip 7c is elastically brought into close contact with the panel 4 by the force, so that sound leakage and water immersion from the gap between the outer peripheral surface of the grommet 1 and the opening 4a can be prevented.

  The extension portion 8 is provided with a slit 10 as a cut from the end in the extension direction toward the grommet body 7 side. The cutting direction of the slit 10 may be the same as the insertion direction of the wire harness 5, and the cutting direction end extends to the vicinity of the root of the extending portion 8 (the grommet body 7 side). That is, the extension portion 8 is divided into left and right in the circumferential direction by the slit 10, but the base portion of the extension portion 8 has a cylindrical shape that is continuous in the circumferential direction, and this portion is the wire harness 5. It is provided as a close contact portion 11 having an inner diameter smaller than the outer diameter of the tape winding portion. Further, the grommet body 7 is formed with bridge-girder-shaped ribs for securing the rigidity of the protruding portion on the passenger compartment side, and the tongue is formed on the side opposite to the extending direction of the extending portion 8 from the rib. The piece-shaped gripping portion 12 is formed so as to extend, and the gripping portion 12 is integrally provided on the grommet 1 in this way.

  Next, how to attach the grommet 1 configured as described above to the panel 4 will be described. First, the length of the second extending portion 9 in the axial direction is wound by winding the second extending portion 9 radially outward from the end in the extending direction and winding it to the root as shown in FIG. Can be prevented from interfering with the insertion work of the wire harness 5. As shown in the illustrated example, the winding operation can be easily performed by forming the second extending portion 9 thin.

  Moreover, since the internal diameter of each extension part 8 * 9 is smaller than the outer diameter of the tape winding part of the wire harness 5 to penetrate as above-mentioned, the insertion operation of the wire harness 5 is difficult as it is. Therefore, as shown in FIG. 5, as shown in the conventional example, a jig having a plurality of claws 13 is inserted so as to penetrate both extension portions 8 and 9, and the claws 13 are opened to each other. Let both extension parts 8 and 9 expand. And the wire harness 5 is inserted with respect to both the extension parts 8 * 9 as shown by the arrow A of a figure. At this time, since both the extending portions 8 and 9 are expanded, a large lump portion by a plurality of couplers 5a connected to the tip of the wire harness 5 and the tape of the wire harness 5 are wound to become a large diameter. The tape winding part can be easily inserted. Thereafter, the jig is pulled out and the winding of the second extending portion 9 is returned to the original state.

  In the state in which the jig is inserted, the two extended portions 8 and 9 are deformed so as to be aligned on a straight line. For example, the bellows portion 14 is formed at the base portion of the second extended portion 9 as shown in the figure. By providing this, the direction of the axis of the second extending portion 9 can be easily changed, and an unreasonable stress is not generated when the second extending portion 9 is on the straight line. Moreover, since the slit 10 part can expand greatly on the extension part 8 side, no problem is caused in the same manner.

  When the wire harness 5 is inserted into the grommet 1, as shown in FIG. 6, the extending portion 8 of the grommet 1 is inserted into the opening 4 of the panel 4 from the engine room 3 side, and the extending portion 8 of the grommet main body 7 is inserted. The side is projected into the passenger compartment 2. Then, the grip portion 12 is gripped with a finger and the grommet 1 is pulled inside the vehicle compartment 2 as indicated by an arrow B. By the pulling, the grommet body 7 can be pulled until the outward flange portion 7a hits the panel 4 and the circumferential groove 7b is engaged with the opening 4a. The grommet 1 is attached to the panel 4 and held by the engagement between the circumferential groove 7b and the opening 4a.

  The grommet body 7 has a convex portion that forms a bank portion on the vehicle interior side of the circumferential groove 7b. However, the grommet body 7 has an empty chamber 6 that is sufficiently larger than the outer diameter of the wire harness 5. Can be elastically deformed inward in the radial direction, it is easy for the edge of the opening 4a to get over the convex portion and enter the circumferential groove 7b.

  In the grommet 1 according to the present invention, since the close contact portion 11 is provided at the root of the extension portion 8, the slit 10 can be provided only before the close contact portion 11, and thus the extension portion as in the conventional example. It is difficult to hold the extended portion 8 by opening the 8 at the left and right of the slit 10 and inserting a finger. On the other hand, since the grip portion 12 is provided, the grip portion 12 can be gripped as described above, and the grommet 1 can be easily attached.

  Furthermore, since the slit 10 has a length up to the middle of the extended portion 8 and the close contact portion 11 is provided at the root of the extended portion 8, the close contact portion 11 extends the outer periphery of the wire harness 5 over the entire periphery. It can be wrapped in close contact with no gap. As a result, there is no gap between the inner peripheral surface of the extension 8 and the outer periphery of the wire harness 5 so that sound leaks or rainwater is submerged. Become. Thus, soundproofing and waterproofing can be performed with a simple structure without using a sound insulating material or a waterproof material.

  Even in the second extension portion 9, the tape winding portion of the wire harness 5 is tightened by the second extension portion 9 by making the diameter smaller than the outer diameter of the tape winding portion of the wire harness 5, for example. Therefore, the entire second extending portion 9 can be a close contact portion with respect to the wire harness 5. Thereby, even if there is some unevenness on the outer peripheral surface of the tape winding portion of the wire harness 5, the clearance can be more reliably eliminated in the entire extending portion, so that the soundproofing and waterproofing effects can be further ensured. . In particular, when the second extending portion 9 is disposed on the engine room 3 side, high waterproofness is required, but this can be achieved with the above-described simple structure. Further, as described above, even if the inner diameter of the second extension portion 9 is made small, the workability is not affected. Even in the second extending portion 9, a slit may be provided leaving a close contact portion in the same manner as the extending portion 8. By doing in this way, it is not necessary to wind up the 2nd extension part 9 at the time of insertion work of wire harness 5, and insertion work can be performed easily.

  Further, in the illustrated example, since the extension portion 8 is thicker than the second extension portion 9, a force for holding the wire harness 5 bent substantially at a right angle in that state is secured. can do. On the other hand, when the wire harness 5 is inserted, the extending portion 5 needs to be expanded. However, in the case of a thick wall, a large expanding force is required. The left and right portions of the eight cuts 10 are opened to be in an expanded state. As a result, it is possible to ensure both the holding force that can resist the natural return force of the wire harness 5 bent at the minimum bending radius and the workability when the wire harness 5 is inserted.

  In addition, in the mounting state of FIG. 1, you may make it wind a tape around the wire harness 5 exposed to each outer peripheral surface and outward with respect to each extension part 8 * 9. Thereby, the soundproofing / waterproofing effect can be further enhanced.

  In the illustrated example, the contact portion 11 is provided on the inner peripheral surface of the extension portion 8 and on the extension thereof, and is formed to have a smaller diameter than the outer diameter of the tape winding portion of the wire harness 5. As shown in FIG. 7, a close contact portion 15 that is formed of a radially inward circumferential protrusion and whose diameter to the protruding end is smaller than the outer diameter of the tape winding portion of the wire harness 5 may be provided. . According to this, the elastic deformation of the projecting shape of the close contact portion 15 enables the outer periphery of the wire harness 5 to be more closely contacted, so that a further soundproofing and waterproofing effect can be obtained. In addition, although the installation range with respect to the circumferential direction of this contact | adherence part 15 may be about the substantially half circumference of the radial direction outer side in the bending of the wire harness 5, you may provide as a circumferential protrusion continuous over the perimeter. Moreover, although the slit 10 has a shape having a width, it may be only a linear cut. According to this, since the end faces of the cuts can be brought into close contact with each other by removing the jig after being expanded with the jig, it is possible to eliminate a gap in the appearance of the extending portion 8.

  Next, a second embodiment will be described below with reference to FIG. In addition, the same code | symbol is attached | subjected about the part similar to the said example of illustration, and the detailed description is abbreviate | omitted. In the grommet 21 of the second embodiment, an extending portion 22 on the side of the vehicle compartment 2 in the attached state with respect to the grommet body 7 is provided coaxially. Accordingly, the second extending portion 9 is also coaxial. In addition, a bellows portion 23 as a close contact portion is provided at a portion on the grommet main body 7 side which is a base of the extension portion 22. Further, four slits 24 provided in the extending portion 22 are arranged at an equal pitch in the circumferential direction, and each cutting direction is an insertion direction of the wire harness 5 as in the above example, and the cutting direction The end is up to the front of the bellows portion 23. The number of slits 24 is arbitrary.

  Also in the grommet 21 configured as described above, the slit 24 provided in the extending portion 22 extends to the front side of the close contact portion 23, and the close contact portion 23 is located on the outer periphery of the tape winding portion of the inserted wire harness 5. Since the contact can be made without gaps over the entire circumference, the same effect as described above can be obtained.

  In each of the above illustrated examples, the grommet body 7 forms a vacant space 6 between a portion (a portion corresponding to the opening 4a) having a circumferential groove 7b as an engaging portion and the extending portion 8. However, the shape of the grommet body 7 is not limited to this. For example, only the annular member having the circumferential groove 7b may be used as the grommet body. In that case, the extension part itself corresponding to the extension part 8 is formed in a substantially L-shape.

  The grommet according to the present invention can be soundproofed and waterproofed with a simple structure and can be easily attached, and is particularly useful when wiring a wire harness so as to penetrate a panel of an automobile.

It is a principal part fracture side view which shows the state attached to the panel of the grommet based on this invention. It is a sectional side view of a grommet. It is a perspective view which shows the external appearance of a grommet. It is a figure corresponding to FIG. 2 which shows the process of the grommet before a wire harness insertion. It is a perspective view which shows the insertion point to the grommet of a wire harness. It is side sectional drawing which shows the attachment point to the panel of a grommet. It is a figure corresponding to FIG. 2 which shows the other example of a contact part. It is a sectional side view which shows the other example of a grommet. It is a principal part fracture | rupture side view which shows the state attached to the panel of the conventional grommet. It is a perspective view which shows the insertion procedure to the grommet of the conventional wire harness. It is a sectional side view which shows the attachment point to the panel of the conventional grommet.

Explanation of symbols

1 Grommet 4 Panel 4a Opening 5 Wire harness (electric wire)
5a Coupler 6 Empty room 7 Grommet body 7b Engagement part 8 Extension part 10 Slit (cut)
11 adhesion part

Claims (5)

A grommet that can be attached to an opening provided in the panel and put the electric wire in an inserted state in order to wire the electric wire through the panel,
The grommet has an engaging portion that can be engaged with the opening, an extending portion that extends from the grommet body in the insertion direction of the electric wire on at least one end side of the grommet body, and the grommet A second extending portion provided on a side opposite to the extending portion across the panel of the main body ,
The extending portion is formed between the notch provided from the extending end toward the grommet main body and the grommet main body and the notch so as to be in close contact with the entire circumference of the inserted wire in the circumferential direction. possess a contact portion provided on,
The grommet is characterized in that the second extending portion is formed thin so that it can be wound from the end in the extending direction to the outside in the radial direction and wound substantially up to the root . A second extension having a contact portion formed on the side opposite to the extension portion of the grommet body so as to extend from the grommet body and can be in close contact with the entire circumference of the inserted wire in the circumferential direction. The grommet according to claim 1, wherein a protruding portion is provided. The grommet according to claim 1, wherein the extending portion extends in a direction substantially perpendicular to the grommet main body. The grommet according to claim 3, wherein a grip portion is provided on an outer surface of the grommet so that the grommet body can be pulled in an insertion direction when the grommet body is attached to the opening. The wall thickness of the extension portion is formed to be thicker than the thickness of the second extension portion so as to hold an electric wire bent in a substantially right angle direction in that state. Item 4. The grommet according to item 3.

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