JP2018133962A - Grommet and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can achieve weight reduction while securing strength.SOLUTION: A grommet 1 includes: a grommet body 4 which is attached to a panel opening 3a while attached to an outer periphery of a wire harness W/H inserted into the panel opening 3a of a vehicle body panel 3; and a reinforcement sheet 5 laminated on the grommet body 4. The grommet body 4 includes: a small diameter cylinder part 41 attached to the outer periphery of the wire harness W/H; a large diameter cylinder part 42 which is attached to the panel opening 3a while arranged at the outer periphery side of the small diameter cylinder part 41; and a connection part 43 connecting the small diameter cylinder part 41 to the large diameter cylinder part 42. The reinforcement sheet 5 includes: a small diameter cylinder part side portion 5c provided at the small diameter cylinder part 41; and a connection part side portion 5d which is provided at the connection part 43 continuously from the small diameter cylinder part side portion 5c.SELECTED DRAWING: Figure 3

Description

  The present invention relates to, for example, a grommet that protects an electric wire inserted through a vehicle body panel and a method for manufacturing the same.

  Conventional grommets are small-diameter cylindrical parts that are attached to the outer periphery of the electric wire, large-diameter cylindrical parts that are attached to the panel opening of the vehicle body panel, and an annular plate-like connection that connects the small-diameter cylindrical part and the large-diameter cylindrical part. Department. In such a grommet, in order to ensure the strength of a portion where stress is likely to concentrate, the thickness of the portion is increased or a reinforcing rib is provided.

  For example, the connecting portion is connected to the small-diameter cylindrical portion in a substantially T shape, and the connecting portion, the small-diameter cylindrical portion, and the strength of each of the connecting portions are secured in the recessed corner portion of the connecting portion. A plurality of reinforcing ribs are provided at intervals in the circumferential direction of the small-diameter cylindrical portion (see Patent Document 1).

  Each reinforcing rib is formed in a triangular shape having a somewhat large size in order to ensure the strength of each of the connecting portion, the small-diameter cylindrical portion, and their connecting portions. For example, each reinforcing rib extends over the entire radial direction of the coupling portion on the coupling portion, and is formed at the same height as the large-diameter cylindrical portion on the small-diameter cylindrical portion.

JP 2008-027692 A

  However, the conventional grommet as in Patent Document 1 has a drawback that the grommet becomes heavy because the thickness of the portion where stress is easily concentrated is increased or the reinforcing rib is provided.

  Then, this invention aims at providing the grommet which can be reduced in weight, ensuring intensity | strength, and its manufacturing method.

The present invention includes a grommet body attached to the panel opening in a state of being attached to the outer periphery of an electric wire inserted through the panel opening of the vehicle body panel, and a reinforcing sheet laminated on the grommet body. The grommet body includes a small-diameter cylindrical portion that is attached to the outer periphery of the electric wire, a large-diameter cylindrical portion that is attached to the panel opening in a state of being disposed on the outer peripheral side of the small-diameter cylindrical portion, the small-diameter cylindrical portion, A connecting portion that connects the large-diameter cylindrical portion, and the reinforcing sheet is provided in the connecting portion continuously from the small-diameter cylindrical portion-side portion provided in the small-diameter cylindrical portion and the small-diameter cylindrical portion-side portion. And a connecting portion side portion.
The reinforcing sheet may be laminated on the surface of the grommet body, or may be laminated while being embedded in the grommet body.

  According to the present invention, since the grommet body is reinforced by using the reinforcing sheet, it is possible to prevent the grommet body from being thickened or the grommet body from being provided with reinforcing ribs in order to reinforce the grommet body. it can. As a result, it is possible to reduce the weight of the grommet while ensuring the strength of the grommet.

  In the present invention, the grommet can be attached to the panel opening by pushing the large diameter cylinder of the grommet into the panel opening while holding the end of the small diameter cylinder opposite to the mounting direction by hand. However, in this case, since the reinforcing sheet is provided and the connecting portion side portion of the reinforcing sheet is continuously formed from the small diameter cylindrical portion side portion, the pushing when the large diameter cylindrical portion of the grommet is pushed into the panel opening portion. By the force, it is possible to suppress buckling of the small-diameter cylindrical portion, the coupling portion, and their connecting portions. As a result, the pushing force can be reliably transmitted from the small diameter cylindrical portion to the connecting portion, and the grommet can be easily attached to the panel opening. In addition, said attachment direction is a direction which attaches a grommet to a panel opening part (the following is the same).

As an aspect of the present invention, the reinforcing sheet may be provided with a cut portion that is interrupted along a direction intersecting the circumferential direction in at least one circumferential direction of the grommet body.
The above-mentioned “direction intersecting the circumferential direction of the grommet body” includes not only a direction orthogonal to the circumferential direction of the grommet body but also an inclined direction. The interrupted portion may be opened at both ends in the direction orthogonal to the circumferential direction of the reinforcing sheet, or may not be opened. The discontinuous portion may be a discontinuous section in which no reinforcing sheet is formed, or may be a linear cut with respect to the reinforcing sheet.
According to the present invention, it is possible to allow the grommet main body (and thus the small diameter cylindrical portion) to elastically extend in the circumferential direction by the interrupted portion. Thereby, an electric wire thicker than the internal diameter of a small diameter cylinder part can be inserted in a small diameter cylinder part.

  As an aspect of the present invention, a recess in which the reinforcing sheet is provided may be formed on the surface of the grommet body, and the reinforcing sheet may be provided in the recess.

  By this invention, it can suppress that a level | step difference arises between the surface of a grommet main body, and the surface of a reinforcement sheet. Thereby, it can suppress that stress concentrates on said level | step difference and a grommet is damaged.

Moreover, as an aspect of this invention, the length of the width of the circumferential direction of the said connection part side part among the said reinforcement sheets may be longer than the length of the width of the circumferential direction of the said small diameter cylinder part side part.
According to the present invention, it is possible to reinforce the connecting portion that is relatively easy to buckle to be stronger than the small-diameter cylindrical portion that is relatively difficult to buckle.

Moreover, as an aspect of this invention, the thickness of the said connection part side part among the said reinforcement sheets may be thicker than the thickness of the said small diameter cylinder part side part.
According to the present invention, it is possible to reinforce the connecting portion that is relatively easy to buckle to be stronger than the small-diameter cylindrical portion that is relatively difficult to buckle.

Moreover, as an aspect of this invention, the thickness of the connection part of the said connection part side part and the said small diameter cylinder part side part among the said reinforcement sheets may be thicker than the thickness of another part.
The connecting portion of the reinforcing sheet has a bent shape, but by chamfering the concave corner of the bent portion, the thickness of the connecting portion is made uniform over the circumferential direction of the grommet. Alternatively, the thickness of the connecting portion may be partially increased along the circumferential direction of the grommet by providing a rib at the concave angle of the bent portion.
By this invention, the connection part (namely, part where stress tends to concentrate) of the connection part side part and small diameter cylinder part side part in a reinforcement sheet | seat can be reinforced.

As an aspect of the present invention, the reinforcing sheet may include a large-diameter cylindrical portion side portion that is continuously provided in the large-diameter cylindrical portion from the connecting portion-side portion.
According to the present invention, when the large-diameter cylindrical portion of the grommet is attached to the panel opening, and the small-diameter cylindrical portion is pulled to the opposite side of the mounting direction, the connecting portion is It can suppress that the large diameter cylinder part is turned over by being pulled out from the inside of the large diameter cylinder part. As a result, the grommet can be removed from the panel opening without turning the large-diameter cylindrical portion over.

  Further, as an aspect of the present invention, the inner peripheral surface of the large diameter cylindrical portion is provided with a convex portion protruding radially inward of the large diameter cylindrical portion, and the connecting portion side portion of the reinforcing sheet is It may extend to the radially outer side of the large-diameter cylindrical part than the tip part of the convex part.

  According to the present invention, when the small-diameter cylindrical portion is pulled to the opposite side of the mounting direction in a state where the large-diameter cylindrical portion of the grommet is attached to the panel opening portion, the connecting portion side portion of the reinforcing sheet becomes the large-diameter cylindrical portion. By interfering with the provided convex part, it can suppress that a connection part is pulled out from the inside of a large diameter cylinder part, and a large diameter cylinder part turns over. As a result, the grommet can be removed from the panel opening without turning the large-diameter cylindrical portion over.

  Further, as an aspect of the present invention, the small-diameter cylindrical portion is provided with a small-diameter cylindrical portion-side through-hole penetrating an inner peripheral surface and an outer peripheral surface, and the small-diameter cylindrical portion-side portion of the reinforcing sheet is formed by the small-diameter cylinder. The connecting portion side portion of the reinforcing sheet may be continuously formed from the small diameter cylindrical portion side portion through the small diameter cylindrical portion side through hole.

In addition, the connection part side part of a reinforcement sheet may be provided in any surface of the surface by the side of the attachment direction in a connection part, and the surface of the other side.
According to the present invention, even if the small-diameter cylindrical portion side portion of the reinforcing sheet is provided on the inner peripheral surface of the small-diameter cylindrical portion, the connecting portion-side portion of the reinforcing sheet is connected to the small-diameter cylinder of the reinforcing sheet via the small-diameter cylindrical portion-side through hole. It can form continuously from a part side part.

  Further, as an aspect of the present invention, the connecting portion is provided with a connecting portion side through hole that penetrates the surface in the mounting direction and the surface on the opposite side, and the small diameter cylindrical portion side portion of the reinforcing sheet is The connecting portion side portion of the reinforcing sheet is provided on the surface of the connecting portion in the mounting direction, and the small diameter tube portion is provided via the connecting portion side through hole. You may form continuously from a side part.

  According to this invention, even if the reinforcing sheet is provided on the outer peripheral surface of the small-diameter cylindrical portion and the surface on the attachment direction side of the connecting portion, the connecting portion-side portion of the reinforcing sheet is connected to the small-diameter cylindrical portion via the connecting portion-side through hole. It can be formed continuously from the side part.

  Further, as an aspect of the present invention, a flange portion extending outward in the radial direction of the large-diameter cylindrical portion is provided at an end of the outer peripheral surface of the large-diameter cylindrical portion opposite to the mounting direction. A reinforcing sheet may be provided from the end surface of the portion opposite to the mounting direction to the main surface on the same side of the flange portion.

  According to the present invention, when the grommet is attached to the panel opening, the reinforcing sheet can suppress buckling of the flange when the vehicle body panel comes into contact with the flange. That is, the flange portion can be reinforced by the reinforcing sheet without increasing the thickness of the flange portion.

As an aspect of the present invention, the reinforcing sheet may be formed of a member having a hardness higher than that of the member constituting the grommet body.
According to the present invention, even if the thickness of the reinforcing sheet is relatively thin, the reinforcing sheet can have a necessary strength.

Further, the present invention is a grommet manufacturing method for manufacturing the above grommet, wherein a step of previously forming one of the grommet main body and the reinforcing sheet, and a mold for forming the grommet, A step of arranging the one of the grommet body and the reinforcing sheet, and a step of pouring a molten material for forming the other of the grommet body and the reinforcing sheet into the mold to form the grommet. And a step of removing the grommet from the mold after the molten material is cured.
According to the present invention, the above-described grommet can be manufactured. Moreover, a grommet main body and a reinforcement sheet can be mutually joined without using an adhesive agent.

  According to the present invention, it is possible to provide a grommet that can be reduced in weight while ensuring strength, and a method for manufacturing the grommet.

The disassembled perspective view which shows the state from which the grommet which concerns on embodiment of this invention was removed from the vehicle body panel. The perspective view which shows a grommet. AA sectional drawing of FIG. (A) is the elements on larger scale of FIG. 3, (b) is CC sectional drawing of FIG. 4 (a), (c) DD partial sectional drawing of FIG. 4 (a). BB sectional drawing of FIG. (A) is sectional drawing which shows the metal mold | die for forming a grommet, (b) is sectional drawing which shows the state which has arrange | positioned the grommet main body to a metal mold | die. The fragmentary sectional view which shows the state in which the grommet main body was attached to the panel opening part. The fragmentary sectional view which shows the grommet which concerns on the modification 1. FIG. The fragmentary sectional view which shows the grommet which concerns on the modification 2. FIG. The fragmentary sectional view which shows the grommet which concerns on the modification 3. FIG. The fragmentary sectional view which shows the grommet which concerns on the modification 4. FIG. The fragmentary sectional view which shows the grommet which concerns on the modification 5. FIG.

An embodiment of the present invention will be described below with reference to the drawings.
<Embodiment>
<Configuration>
With reference to FIGS. 1-7, the grommet 1 which concerns on embodiment of this invention is demonstrated.
As shown in FIG. 1, the grommet 1 is attached to a panel opening 3a provided in a vehicle body panel 3 of a vehicle (for example, an automobile) and protects a wire harness W / H (electric wire) inserted through the panel opening 3a. To do.

  In FIG. 1, the symbol Y is the axial direction of the grommet 1, and the symbol W is the circumferential direction of the grommet 1. Reference numeral H denotes an attachment direction of the grommet 1 when the grommet 1 is attached to the panel opening 3a, and is a direction parallel to the axial direction Y. The panel opening 3 a is a portion that penetrates the main surfaces on both sides of the vehicle body panel 3. The wire harness W / H is obtained by bundling a plurality of electric wires with a binding tape.

  As shown in FIGS. 2 to 4, the grommet 1 includes a grommet body 4 attached to the panel opening 3 a while being attached to the outer periphery of the wire harness W / H inserted through the panel opening 3 a of the vehicle body panel 3. The reinforcing sheets 5 and 6 are partially laminated on the grommet body 4.

  The grommet body 4 includes a small-diameter cylindrical portion 41 attached to the outer periphery of the wire harness W / H, a large-diameter cylindrical portion 42 attached to the panel opening 3a in a state of being disposed on the outer peripheral side of the small-diameter cylindrical portion 41, and a small-diameter A connecting portion 43 that connects the cylindrical portion 41 and the large-diameter cylindrical portion 42 is provided.

  The small-diameter cylindrical portion 41 is formed in a cylindrical shape (for example, a cylindrical shape) having an inner diameter that is substantially the same as the outer diameter of the wire harness W / H, for example. A flange portion 41 c is provided at an end portion on the mounting direction H side on the outer peripheral surface of the small diameter cylindrical portion 41 and an end portion on the opposite side. The flange portion 41 c extends outward in the radial direction of the small diameter cylindrical portion 41 and is formed over the entire circumferential direction of the small diameter cylindrical portion 41.

  A plurality of ribs 41 b are provided on the inner peripheral surface of the small-diameter cylindrical portion 41, for example, in the vicinity of the end portion on the side opposite to the mounting direction H. The plurality of ribs 41b, for example, seal the gap between the small diameter cylindrical portion 41 and the wire harness W / H inserted therein, and the wire harness W / H slides in the axial direction Y of the small diameter cylindrical portion 41. Suppress. The plurality of ribs 41 b extend inward in the radial direction of the small diameter cylindrical portion 41 and are formed in an annular shape over the entire circumferential direction of the small diameter cylindrical portion 41. The plurality of ribs 41b are provided at intervals in the axial direction Y.

  The large-diameter cylindrical portion 42 has a length in the axial direction Y shorter than that of the small-diameter cylindrical portion 41 and, for example, a truncated cone shape (for example, a conical shape) whose diameter gradually increases from the mounting direction H side toward the opposite side. Trapezoidal). The opening 42a on the opposite side of the mounting direction H in the large-diameter cylindrical portion 42 is formed to have substantially the same size as the panel opening 3a. The inner diameter of the end of the large diameter cylindrical portion 42 on the mounting direction H side is formed larger than the outer diameter of the small diameter cylindrical portion 41.

  On the outer peripheral surface of the large-diameter cylindrical portion 42, a flange portion 42b that locks the vehicle body panel 3 and a concave groove portion 42c that engages with the peripheral edge of the panel opening 3a are provided. The flange portion 42 b is provided at the end of the outer peripheral surface of the large-diameter cylindrical portion 42 on the side opposite to the mounting direction H, and extends outward in the radial direction of the large-diameter cylindrical portion 42. Is formed in an annular shape over the entire circumferential direction.

  A rib 42e for sealing a gap between the grommet 1 and the vehicle body panel 3 is provided on the main surface of the flange portion 42b on the mounting direction H side, for example, on the front end side of the flange portion 42b. The rib 42e protrudes toward the mounting direction H and is formed in an annular shape over the entire circumferential direction of the flange portion 42b.

  The concave groove portion 42 c is provided adjacent to the mounting direction H side of the flange portion 42 b on the outer peripheral surface of the large diameter cylindrical portion 42, and is formed in an annular shape over the entire circumferential direction of the large diameter cylindrical portion 42. Yes. The diameter of the bottom surface of the recessed groove portion 42c in the large diameter cylindrical portion 42 is formed to be approximately the same as the diameter of the panel opening 3a.

  In order to ensure the thickness of the bottom part of the concave groove part 42c, the large diameter cylindrical part over the entire circumferential direction of the large diameter cylindrical part 42c is provided on the back side of the concave groove part 42c on the inner peripheral surface of the large diameter cylindrical part 42. A projecting portion 42 f that protrudes radially inward of 42 is provided.

  The connecting portion 43 is formed in, for example, an annular plate shape (for example, an annular plate shape). The inner peripheral end of the connecting portion 43 is connected to a predetermined position (for example, a central position) in the axial direction Y on the outer peripheral surface of the small diameter cylindrical portion 41 and is connected over the entire circumferential direction of the small diameter cylindrical portion 41. The outer peripheral end of the connecting portion 43 is connected, for example, to the end portion on the mounting direction H side in the large diameter cylindrical portion 42 and is connected over the entire circumferential direction of the large diameter cylindrical portion 42. In this connected state, the connecting portion 43 is, for example, arranged in parallel to the radial direction of the small-diameter cylindrical portion 41, and the small-diameter cylindrical portion 41 and the large-diameter cylindrical portion 42 are arranged concentrically with a space therebetween. Has been.

  As shown in FIGS. 3 and 4, the reinforcing sheet 5 is continuously formed from the small diameter cylindrical portion 41 to the large diameter cylindrical portion 42 across the connecting portion 43. That is, the reinforcing sheet 5 is provided in each of the small-diameter cylindrical portion 41, the large-diameter cylindrical portion 42, and the connecting portion 43, and is connected to the small-diameter cylindrical portion-side portion 5c provided in the small-diameter cylindrical portion 41 in the reinforcing sheet 5. The connecting portion side portion 5d provided in the portion 43 and the large diameter cylindrical portion side portion 5e provided in the large diameter cylindrical portion 42 are continuously formed. The reinforcing sheet 5 is formed to have an appropriate thickness (for example, an appropriate thickness that can give the grommet body 4 the necessary strength).

  In this embodiment, the reinforcing sheet 5 is continuously formed from the outer peripheral surface of the small-diameter cylindrical portion 41 to the inner peripheral surface of the large-diameter cylindrical portion 42 across the main surface opposite to the mounting direction H in the connecting portion 43. Yes. The small diameter cylinder part side part 5c, the large diameter cylinder part side part 5e, and the connection part side part 5d of the reinforcing sheet 5 are formed to have the same thickness, for example.

  In this embodiment, one end 5a of both ends 5a, 5b in the direction X perpendicular to the circumferential direction W of the reinforcing sheet 5 extends to the end opposite to the mounting direction H in the small diameter cylindrical portion 41. However, it does not have to be extended to the end. The other end 5b extends to the vicinity of the center in the axial direction Y of the large-diameter cylindrical portion 42. However, the other end 5b may not extend to the vicinity of the center. It may extend to the opposite position (for example, near the convex portion 42f).

  As shown in FIGS. 2 and 5, the reinforcing sheet 5 extends in the circumferential direction W in the grommet body 4. The reinforcing sheet 5 is provided with an interrupted portion 8 that is interrupted along a direction X (see FIG. 4) that intersects the circumferential direction W in at least one place in the circumferential direction W. In this embodiment, the interrupting portions 8 are provided at a plurality of locations in the circumferential direction W of the reinforcing sheet 5. That is, the reinforcing sheet 5 is intermittently formed along the circumferential direction W of the grommet body 4. In other words, a plurality of belt-shaped reinforcing sheets 5 are arranged with the cut-off portion 8 interposed therebetween.

  In this embodiment, each cut-off portion 8 is formed along a direction orthogonal to the circumferential direction W of the grommet body 4 (in this case, the reinforcing sheet 5 is formed in a vertical stripe shape along the axial direction Y. However, it may be formed along a direction inclined in the circumferential direction W (in this case, the reinforcing sheet 5 is formed in a spiral shape with respect to the axial direction Y).

  As shown in FIG. 5, the length of the width W2 in the circumferential direction W of the connecting portion side portion 5d of the reinforcing sheet 5 is formed longer than the length of the width W1 in the circumferential direction W of the small diameter cylindrical portion side portion 5c. ing. In this embodiment, the width W1 of the small diameter cylindrical portion side portion 5c is formed to be constant along the axial direction Y (see FIG. 2). That is, the small-diameter cylindrical portion side portion 5c is formed in a rectangular shape when viewed from the front.

  In this embodiment, the width W2 of the connecting portion side portion 5d of the reinforcing sheet 5 is formed to be the same width as the width W1 of the small diameter cylindrical portion side portion 5c at the inner peripheral end of the connecting portion 43, and the inner peripheral end of the connecting portion 43 It is formed so as to gradually increase from the outer periphery toward the outer peripheral end. That is, the connecting portion side portion 5d is formed in a substantially sector shape. In addition, the both ends of the circumferential direction W of the connection part side part 5d are extended along the radial direction of the connection part 43, for example.

  As shown in FIGS. 4 and 5, a concave portion 44 is provided on the surface of the grommet body 4 where the reinforcing sheet 5 is laminated in order to suppress a step between the surface of the grommet body 4 and the surface of the reinforcing sheet 5. The reinforcing sheet 5 is provided in the recess 44. For example, the recess 44 is formed to a depth similar to the thickness of the reinforcing sheet 5.

  Specifically, for example, a bottom-view rectangular recess 44a is provided on the outer peripheral surface of the small-diameter cylindrical portion 41, and a bottom-view fan-shaped recess 44b is provided on the main surface opposite to the mounting direction H in the connecting portion 43, for example. Provided on the inner peripheral surface of the large diameter cylindrical portion 42 is, for example, a concave portion 44c that is substantially rectangular in bottom view. Each recessed part 44a, 44b, 44c is formed continuously. Of the reinforcing sheet 5, the small-diameter cylindrical portion side portion 5 c is provided in the concave portion 44 a of the small-diameter cylindrical portion 41, and the connecting portion-side portion 5 d is provided in the concave portion 44 b of the connecting portion 43. The side portion 5e is provided in the concave portion 44c of the large diameter cylindrical portion 42.

  Thereby, in this embodiment, the outer peripheral surface of the small diameter cylinder part 41 and the outer surface of the small diameter cylinder part side part 5c become flat (refer FIG. 5), and the outer surface of the connection part 43 and the outer surface of the connection part side part 5d are It becomes flat (refer FIG.4 (c)), and the level | step difference of the internal peripheral surface of the large diameter cylinder part 42 and the outer surface of the large diameter cylinder part side part 5e is comparatively small (refer FIG.4 (d)). The large-diameter cylindrical portion side portion 5e is slightly raised with respect to the inner peripheral surface of the large-diameter cylindrical portion 42.

  As shown in FIG. 4, the reinforcing sheet 6 is laminated from the end surface on the opposite side of the mounting direction H in the large-diameter cylindrical portion 42 to the main surface on the same side of the flange portion 42b. It is formed over the entire circumferential direction.

  The grommet body 4 and the reinforcing sheets 5 and 6 are made of a synthetic resin (member) such as an elastomer. More specifically, each of the reinforcing sheets 5 and 6 is formed of a synthetic resin (member) having a higher hardness than the synthetic resin (member) forming the grommet body 4. Specifically, the grommet body 4 is formed of, for example, EPDM (ethylene / propylene / diene rubber) having a hardness of 40 to 50, and each of the reinforcing sheets 5 and 6 includes, for example, one of PP (polypropylene) and PA (polyamide). It may be formed of a resin mixed with EPDM having a hardness of 80 or more. Alternatively, the grommet body 4 may be formed of a graft resin having a hardness of 40 to 50, for example, and the reinforcing sheets 5 and 6 may be formed of a graft resin having a hardness of 80 or more, for example. The reinforcing sheets 5 and 6 may have the same hardness or may have different hardness. The hardness is measured by, for example, testing with a durometer type A of JIS K 6253 or ISO 7619-1, and measuring the hardness by reading the scale immediately after pressure contact.

  The thickness of each reinforcement sheet | seat 5 and 6 is 1-3 mm (after shaping | molding), for example. The relationship between the thickness of the reinforcing sheets 5 and 6 and the thickness of the grommet body 4 in the laminated portion where the reinforcing sheets 5 and 6 and the grommet body 4 are laminated is appropriately adjusted in consideration of strength, shape, and the like. For example, the reinforcing sheets 5 and 6 may be thicker than the grommet main body 4 and the grommet main body 4 may be thinner than the reinforcing sheets 5 and 6. In addition, in order to make the thickness of the laminated part and the thickness of the grommet body 5 in the non-laminated part other than the laminated part the same, the grommet body 4 may be thicker than the reinforcing sheets 5 and 6 in the laminated part. .

<Manufacturing method>
Next, with reference to FIG. 6, the manufacturing method of this grommet 1 is demonstrated.
First, the grommet body 4 is formed in advance using, for example, a mold (not shown) for forming the grommet body 4. And the metal mold | die K for forming the grommet 1 containing the grommet main body 4 and the reinforcement sheets 5 and 6 is prepared as shown to Fig.6 (a).

  Then, as shown in FIG. 6 (b), molten resin (molten material) for forming the reinforcing sheets 5 and 6 is injected into the space Ka of the mold K with the grommet body 4 being placed. To do. Reinforcement sheets 5 and 6 are formed on the grommet body 4 by the solidification of the molten resin. Then, after the molten resin is solidified, the grommet body 4 (that is, the grommet 1) provided with the reinforcing sheets 5 and 6 is taken out from the mold K. Thus, the grommet 1 is formed.

<Mounting method>
Next, with reference to FIG.1 and FIG.7, the attachment method which attaches the grommet 1 to the panel opening part 3a of the vehicle body panel 3 is demonstrated. First, as shown in FIG. 1, the wire harness W / H is inserted into the small diameter cylindrical portion 41 of the grommet 1. The grommet 1 is placed in the small-diameter cylindrical portion 41 until the flange portion 42b of the large-diameter cylindrical portion 42 comes into contact with the vehicle body panel 3 with the end opposite to the mounting direction H in the small-diameter cylindrical portion 41 held by hand. Is pushed into the panel opening 3a from the end in the mounting direction H.

  At this time, since the grommet body 4 is reinforced by the reinforcing sheet 5, the grommet 1 is pushed into the panel opening 3a without buckling of the small-diameter cylindrical portion 41, the connecting portion 43, and the connecting portion 5S thereof. Moreover, since the flange part 42b is reinforced by the reinforcement sheet 6, even if the vehicle body panel 3 contacts the flange part 42b, the flange part 42b is suppressed from buckling.

  As shown in FIG. 7, in a state where the flange portion 42 b of the large diameter cylindrical portion 42 is in contact with the vehicle body panel 3, the peripheral edge of the panel opening 3 a is engaged with the concave groove portion 42 c of the large diameter cylindrical portion 42. Thus, the grommet 1 is fixed to the panel opening 3a. Moreover, the rib 42e provided in the flange part 42b is pressed against the vehicle body panel 3, whereby the space between the grommet 1 and the vehicle body panel 3 is sealed.

<Main effects>
As mentioned above, according to the grommet 1 which concerns on this embodiment, the grommet main body attached to the panel opening part 3a in the state with which it attached to the outer periphery of the wire harness W / H (electric wire) penetrated by the panel opening part 3a of the vehicle body panel 3 4 and a reinforcing sheet 5 laminated on the grommet main body 4, and the grommet main body 4 is provided on the outer peripheral side of the small diameter cylindrical portion 41 and the small diameter cylindrical portion 41 mounted on the outer periphery of the wire harness W / H. A large-diameter cylindrical portion 42 attached to the panel opening 3a in the disposed state, and a connecting portion 43 that connects the small-diameter cylindrical portion 41 and the large-diameter cylindrical portion 42 are provided, and the reinforcing sheet 5 is provided in the small-diameter cylindrical portion 41. The small-diameter cylindrical portion side portion 5c and a connecting portion-side portion 5d provided continuously from the small-diameter cylindrical portion-side portion 5c to the connecting portion 43 are provided.

  With this configuration, since the grommet body 4 is reinforced using the reinforcing sheet 5, the grommet body 4 is thickened or the grommet body 4 is provided with reinforcing ribs in order to reinforce the grommet body 4. Can be suppressed. As a result, the grommet 1 can be reduced in weight while ensuring the strength of the grommet 1. Moreover, the freedom degree of the shape of the grommet main body 4 can also be improved.

  Further, in this configuration, the grommet 1 is attached to the panel opening 3a by pushing the grommet 1 into the panel opening 3a while holding the end of the small diameter cylindrical portion 41 opposite to the attachment direction H by hand. However, in this case, since the connecting portion side portion 5d of the reinforcing sheet 5 is continuously formed from the small diameter tube portion side portion 5c, the small diameter tube is caused by the pushing force when the grommet 1 is pushed into the panel opening 3a. It can suppress that the part 41, the connection part 43, and those connection parts 5S buckle. As a result, the pushing force can be reliably transmitted from the small diameter cylindrical portion 41 to the connecting portion 43, and the grommet 1 can be easily attached to the panel opening 3a.

  Further, since the reinforcing sheet 5 is provided with a cut portion 8 that is cut along a direction intersecting the circumferential direction W in at least one place in the circumferential direction W, the grommet body 4 ( In particular, the small-diameter cylindrical part 41) can be allowed to elastically extend in the circumferential direction W. Thereby, the wire harness W / H that is thicker than the inner diameter of the small-diameter cylindrical portion 41 can be inserted into the small-diameter cylindrical portion 41.

  Further, a recess 44 in which the reinforcing sheet 5 is provided is formed on the surface of the grommet body 4, and the reinforcing sheet 5 is provided in the recess 44, so that a step is formed between the surface of the grommet body 4 and the surface of the reinforcing sheet 5. Can be prevented from occurring. Thereby, it can suppress that stress concentrates on said level | step difference and a grommet is damaged.

  Further, in the reinforcing sheet 5, the length of the width W2 in the circumferential direction W of the connecting portion side portion 5d provided in the connecting portion 43 is equal to the circumferential direction W of the small diameter cylindrical portion side portion 5c provided in the small diameter cylindrical portion 41. Therefore, the connecting portion 43 that is relatively easily buckled can be reinforced so as to be stronger than the small-diameter cylindrical portion 41 that is relatively difficult to buckle.

  Moreover, since the reinforcing sheet 5 has the large-diameter cylindrical portion side portion 5e provided continuously from the connecting portion-side portion 5d to the large-diameter cylindrical portion 42, the large-diameter cylindrical portion 42 of the grommet 1 becomes the panel opening 3a. When the small-diameter cylindrical portion 41 is pulled to the side opposite to the mounting direction H in the attached state, the connecting portion 43 is pulled out from the inside of the large-diameter cylindrical portion 42 by the large-diameter cylindrical portion-side portion 5e of the reinforcing sheet 5. It can suppress that the large diameter cylinder part 42 is turned over. As a result, the grommet 1 can be removed from the panel opening 3a without turning the large-diameter cylindrical portion 42 over.

  In addition, a flange portion 42 b extending outward in the radial direction of the large-diameter cylindrical portion 42 is provided at an end of the outer peripheral surface of the large-diameter cylindrical portion 42 opposite to the mounting direction H, and the mounting direction in the large-diameter cylindrical portion 42 is provided. Since the reinforcing sheet 6 is provided from the end surface opposite to H to the main surface on the same side of the flange portion 42b, the vehicle body panel 3 is flanged when the grommet 1 is attached to the panel opening 3a by the reinforcing sheet 6. It can suppress that the flange part 42b buckles when it contact | abuts to 42b. In other words, the flange portion 42b can be reinforced by the reinforcing sheet 6 without increasing the thickness of the flange portion 42b.

  Further, since the reinforcing sheets 5 and 6 are formed of a member having a higher hardness than the members constituting the grommet body 4, even if the thickness of the reinforcing sheets 5 and 6 is relatively thin, It can have the necessary strength.

  Moreover, according to the manufacturing method of the grommet 1 which concerns on this embodiment, the process of forming the grommet main body 4 previously, the process of arrange | positioning the grommet main body 4 previously formed in the metal mold | die K for forming the grommet 1, The step of forming the grommet 1 by pouring molten material for forming the reinforcing sheets 5 and 6 into the mold K, and the grommet 1 taken out from the mold K after the molten material poured into the mold K is cured. Therefore, the grommet 1 can be manufactured, and the grommet body 4 and the reinforcing sheets 5 and 6 can be joined to each other without using an adhesive.

  In this embodiment, the grommet body 4 is formed in advance, and the molten material for forming the reinforcing sheets 5 and 6 is injected into the mold K in a state where the pre-formed grommet body 4 is disposed. Although the grommet 1 is formed, the reinforcing sheets 5 and 6 are formed in advance, and the molten material for forming the grommet body 4 is injected into the mold K with the pre-formed reinforcing sheets 5 and 6 disposed. Thus, the grommet 1 may be formed. Also in this case, the grommet 1 can be manufactured, and the grommet body 4 and the reinforcing sheets 5 and 6 can be joined to each other without using an adhesive.

<< Modification 1 >>
In the above embodiment, the thickness of the small-diameter cylindrical portion side portion 5c and the thickness of the connecting portion side portion 5d in the reinforcing sheet 5 are the same as each other, but as shown in FIG. The thickness d2 of the side part 5d may be thicker than the thickness d1 of the small diameter cylinder part side part 5c. Thereby, the connection part 43 which is comparatively easy to buckle can be reinforced so that it may become stronger than the small diameter cylinder part 41 which is comparatively hard to buckle.

<< Modification 2 >>
As shown in FIG. 9, in the above-described embodiment, the thickness d3 of the connection portion 5S between the connecting portion side portion 5d and the small diameter cylindrical portion side portion 5c of the reinforcing sheet 5 is the other portion (for example, the small diameter cylindrical portion). It may be thicker than the thicknesses d1 and d2 of the side portion 5c and the connecting portion side portion 5d). Thereby, the connection part (namely, part where stress tends to concentrate) 5S of the reinforcement sheet 5 can be reinforced.

  The connecting portion 5S of the reinforcing sheet 5 has a bent shape, for example, but the thickness d3 of the connecting portion 5S is made uniform in the circumferential direction W by chamfering the concave angle of the bent portion. It may be thicker than other parts. Alternatively, by providing a rib at the bent angle of the bent portion, the thickness d3 of the connecting portion 5S may be made partially thicker in the circumferential direction W, for example, to be thicker than other portions.

  Note that the thickness d3 of the connection portion 5S means that when the concave main surface of the connection portion 5S is a flat surface (FIG. 9), the thickness is parallel to the concave main surface and the convex main surface of the connection portion 5S. The shortest distance (that is, the vertical distance) between the convex side tangent plane in contact with the concave side main surface, and on the other hand, when the concave side main surface of the connecting portion 5S is a curved surface, it contacts the concave side main surface. Of all the concave side tangent surfaces, the concave side where the shortest distance (ie, vertical distance) between the convex side tangent plane parallel to the concave side tangent surface and in contact with the convex main surface of the connecting portion 5S is maximized. The shortest distance on the main surface.

<< Modification 3 >>
In the above embodiment, in order to prevent the large-diameter cylindrical portion 42 from turning over when the grommet 1 is removed from the panel opening 3a, the reinforcing sheet 5 is continuously provided from the connecting portion side portion 5d. 10 has a large-diameter cylindrical portion side portion 5e. However, as shown in FIG. When projecting inward, the connecting portion side portion 5d of the reinforcing sheet 5 only needs to extend to the radially outer side of the large-diameter cylindrical portion 42 rather than the tip portion of the convex portion 42f. In other words, the other end portion 5b of the reinforcing sheet 5 only needs to extend to the radially outer side of the large-diameter cylindrical portion 42 with respect to the tip end portion of the convex portion 42f. In this case, the reinforcing sheet 5 may not have the large-diameter cylindrical portion side portion 5e.

  According to this modification, when the small-diameter cylindrical portion 41 is pulled to the opposite side of the mounting direction H in a state where the large-diameter cylindrical portion 42 of the grommet 1 is attached to the panel opening 3a, the connecting portion of the reinforcing sheet 5 The side portion 5d interferes with the convex portion 42f provided on the large-diameter cylindrical portion 42, so that the connecting portion 43 can be prevented from being pulled out of the large-diameter cylindrical portion 42 and the large-diameter cylindrical portion 42 turned over. . As a result, the grommet 1 can be removed from the panel opening 3a without turning the large-diameter cylindrical portion 42 over.

<< Modification 4 >>
In the above embodiment, the small-diameter cylindrical portion-side portion 5c of the reinforcing sheet 5 is provided on the outer peripheral surface of the small-diameter cylindrical portion 41, but is provided on the inner peripheral surface of the small-diameter cylindrical portion 41 as shown in FIG. Also good. In this case, the small diameter cylindrical portion 41 is provided with a through hole (small diameter cylindrical portion side through hole) 41e penetrating the outer peripheral surface and the inner peripheral surface. The reinforcing sheet 5 is continuously formed from the inner peripheral surface of the small diameter cylindrical portion 41 to the main surface opposite to the mounting direction H in the connecting portion 43 through the through hole 41e. That is, the connecting portion side portion 5d provided on the main surface of the connecting portion 43 opposite to the mounting direction H is connected to the small diameter cylindrical portion side portion provided on the inner peripheral surface of the small diameter cylindrical portion 41 through the through hole 41e. It is formed continuously from 5c.

  The through hole 41e is provided in the small diameter cylindrical portion 41, for example, at the same height as the connecting portion side portion 5d of the reinforcing sheet 5. The through hole 41 e is formed in a long hole shape along the circumferential direction W. More specifically, the width in the circumferential direction W of the through hole 41e is, for example, the same width as the width in the circumferential direction W of the connecting portion side portion 5d of the reinforcing sheet 5, and the width in the axial direction Y of the through hole 41e. Is formed in the same size as the thickness of the connecting portion side portion 5d of the reinforcing sheet 5, for example.

  Also in this case, similarly to the above-described embodiment, the inner peripheral surface of the small-diameter cylindrical portion 41 is provided with a recess 44a in a portion where the reinforcement sheet 5 is provided, and the reinforcement sheet 5 is provided in the recess 44a. Is formed.

According to this modification, the small diameter cylindrical portion 41 is provided with a through hole 41e (small diameter cylindrical portion side through hole) penetrating the inner peripheral surface and the outer peripheral surface, and the reinforcing sheet 5 is interposed via the through hole 41e. Therefore, even if the reinforcing sheet 5 is provided on the inner peripheral surface of the small-diameter cylindrical portion 41, the reinforcing sheet is provided via the through hole 41e. 5 can be continuously formed from the inner peripheral surface of the small-diameter cylindrical portion 41 to the connecting portion 43.
In this modification, the connecting portion side portion 5d of the reinforcing sheet 5 is provided on the main surface of the connecting portion 43 on the side opposite to the mounting direction H, but on the main surface of the connecting portion 43 on the mounting direction H side. It may be provided.

<< Modification 5 >>
In the above embodiment, the connecting portion side portion 5d of the reinforcing sheet 5 is provided on the main surface of the connecting portion 43 opposite to the attaching direction H. However, as shown in FIG. It may be provided on the main surface on the side.
In this case, the connecting portion 43 is provided with through holes (connecting portion side through holes) 43a penetrating the main surfaces on both sides, and the reinforcing sheet 5 is disposed on the outer periphery of the small-diameter cylindrical portion 41 via the through holes 43a. It is formed continuously from the main surface on the mounting direction H side in the connecting portion 43 from the surface, and further formed continuously from the main surface on the mounting direction H side in the connecting portion 43 to the outer peripheral surface of the large diameter cylindrical portion 42. ing.

  That is, the connecting portion side portion 5d provided on the main surface on the mounting direction H side in the connecting portion 43 is separated from the small diameter tube portion side portion 5c provided on the outer peripheral surface of the small diameter tube portion 41 through the through hole 43a. It is formed continuously. The large-diameter cylindrical portion-side portion 5e provided on the outer peripheral surface of the large-diameter cylindrical portion 42 is continuously formed from the connecting portion-side portion 5d provided on the main surface on the mounting direction H side in the connecting portion 43. .

  The through hole 43 a is provided in the vicinity of the radially inner end (that is, the inner peripheral end) of the connecting portion 43, and is formed in a long hole shape extending in the circumferential direction W. More specifically, the width in the circumferential direction W of the through hole 43a is, for example, the same size as the width in the circumferential direction W of the end portion on the small diameter cylindrical portion 41 side of the connecting portion side portion 5d. The width in the radial direction is, for example, the same size as the thickness of the small-diameter cylindrical portion side portion 5c.

  In this case as well, as in the above embodiment, a recess 44b is provided in the portion where the reinforcing sheet 5 is provided on the main surface of the connecting portion 43 on the mounting direction H side, and the outer periphery of the large-diameter cylindrical portion 42 is provided. A concave portion 44c is provided in a portion of the surface where the reinforcing sheet 5 is provided, and the reinforcing sheet 5 is formed in each of the concave portions 44b and 44c.

  According to this modification, the connecting portion 43 is provided with through holes 43a (connecting portion side through holes) penetrating the main surfaces on both sides, and the reinforcing sheet 5 is connected to the small diameter cylindrical portion 41 via the through holes 43a. The reinforcing sheet 5 is formed on the outer peripheral surface of the small-diameter cylindrical portion 41 and the main surface of the connecting portion 43 on the mounting direction H side. Even if provided, the reinforcing sheet 5 can be continuously formed from the outer peripheral surface of the small-diameter cylindrical portion 41 to the main surface on the mounting direction H side of the connecting portion 43 through the through hole 43a.

  The present invention is not limited only to the configuration of the above-described embodiment and modification examples, and includes a combination of the above-described embodiment and modification examples, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Grommet 3 ... Vehicle body panel 3a ... Panel opening part 4 ... Grommet main body 5,6 ... Reinforcement sheet 5c ... Small diameter cylinder side part 5d ... Connection part side part 5e ... Large diameter cylinder part side part 5S ... Connection part 8 ... Way Cut portion 41... Small diameter tube portion 41 e... Through hole (small diameter tube portion side through hole)
42 ... Large-diameter cylindrical portion 42b ... Flange portion 42f ... Protruding portion 43 ... Connection portion 43e ... Through hole (connection portion side through hole)
44: Recessed portion d1: Thickness of the small diameter cylindrical portion side portion d2: Thickness of the connecting portion side portion H ... Mounting direction K ... Mold W ... Circumferential direction W1 ... Circumferential width of the small diameter cylindrical portion side portion W2: Connection portion Side part circumferential width W / H ... Wire harness

Claims (13)

A grommet body attached to the panel opening in a state of being attached to the outer periphery of the electric wire inserted through the panel opening of the vehicle body panel, and a reinforcing sheet laminated on the grommet body,
The grommet body includes a small-diameter cylindrical portion that is attached to the outer periphery of the electric wire, a large-diameter cylindrical portion that is attached to the panel opening in a state of being disposed on the outer peripheral side of the small-diameter cylindrical portion, the small-diameter cylindrical portion, A connecting portion for connecting the large-diameter cylindrical portion,
The reinforcing sheet is a grommet including a small-diameter cylindrical portion side portion provided in the small-diameter cylindrical portion, and a connecting portion-side portion continuously provided in the connecting portion from the small-diameter cylindrical portion-side portion. 2. The grommet according to claim 1, wherein the reinforcing sheet is provided with a cut-off portion cut along a direction intersecting the circumferential direction at at least one place in the circumferential direction of the grommet body. The grommet according to claim 1 or 2, wherein a recess in which the reinforcing sheet is provided is formed on a surface of the grommet body, and the reinforcing sheet is provided in the recess. The length of the circumferential width of the connecting portion side portion in the reinforcing sheet is longer than the circumferential width of the small-diameter cylindrical portion side portion. The grommet described. 5. The grommet according to claim 1, wherein a thickness of the connecting portion side portion of the reinforcing sheet is thicker than a thickness of the small diameter cylindrical portion side portion. The thickness of the connection part of the said connection part side part and the said small diameter cylinder part side part among the said reinforcement sheet | seats is one of Claims 1-5 thicker than the thickness of another part. Grommet. 7. The grommet according to claim 1, wherein the reinforcing sheet includes a large-diameter cylindrical portion-side portion that is continuously provided in the large-diameter cylindrical portion from the connecting-portion-side portion. On the inner peripheral surface of the large-diameter cylindrical portion, a convex portion protruding inward in the radial direction of the large-diameter cylindrical portion is provided,
8. The grommet according to claim 1, wherein the connecting portion side portion of the reinforcing sheet extends to a radially outer side of the large-diameter cylindrical portion with respect to a tip portion of the convex portion. The small-diameter cylindrical portion is provided with a small-diameter cylindrical portion-side through hole that penetrates the inner peripheral surface and the outer peripheral surface,
The small diameter cylindrical portion side portion of the reinforcing sheet is provided on the inner peripheral surface of the small diameter cylindrical portion,
The grommet according to claim 1, wherein the connecting portion side portion of the reinforcing sheet is continuously formed from the small diameter cylindrical portion side portion through the small diameter cylindrical portion side through hole. . The connecting portion is provided with a connecting portion side through-hole that penetrates the surface on the side in the mounting direction and the surface on the opposite side,
The small diameter cylindrical portion side portion of the reinforcing sheet is provided on the outer peripheral surface of the small diameter cylindrical portion,
The connecting portion side portion of the reinforcing sheet is provided on a surface of the connecting portion in the mounting direction, and is continuously formed from the small diameter cylindrical portion side portion through the connecting portion side through hole. The grommet according to claim 9. A flange portion extending outward in the radial direction of the large-diameter cylindrical portion is provided at an end of the outer peripheral surface of the large-diameter cylindrical portion opposite to the mounting direction,
The grommet according to any one of claims 1 to 10, wherein a reinforcing sheet is provided from an end surface of the large-diameter cylindrical portion on the opposite side of the mounting direction to a main surface on the same side of the flange portion. The grommet according to one of claims 1 to 11, wherein the reinforcing sheet is formed of a member having a hardness higher than that of a member constituting the grommet body. A grommet manufacturing method for manufacturing the grommet according to one of claims 1 to 12,
Forming one of the grommet body and the reinforcing sheet in advance;
Disposing the one of the grommet body and the reinforcing sheet in a mold for forming the grommet;
Pouring a molten material for forming the other of the grommet body and the reinforcing sheet into the mold to form the grommet;
A step of removing the grommet from the mold after the molten material is cured.

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