Grommet

Abstract

To ensure waterproofness.SOLUTION: A grommet comprises a base member 10X in which seal members 71 are provided between joint surfaces 10a of multiple split base members 10 split radially around the axis of an insertion path. The base member, which is formed in combination with split tubes 13 of the multiple split base members, includes a tubular body 40 in which a wiring material We of the inner insertion path is pulled out of an opening 40a. The tubular body comprises a bent part 41 and a straight tube part 42 having the opening. The opening is plugged with a waterproof tape Tp wrapped around between an outer peripheral surface 40b of the straight tube part and the wiring material pulled out of the opening 40a. As for the straight tube part, a tape position specification part 44 is provided to designate a tolerance range of the end position of the waterproof tape on the side of the straight tube part in a place on the outer peripheral surface, where the seal member is provided between the inner joint surfaces.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a grommet. [Background technology]

[0002] Conventionally, in a wire harness, a wiring material such as an electric wire is inserted through a through hole provided in an object to be inserted (for example, a body panel of a vehicle, etc.) to wire the wiring material between one space and the other space separated by the object to be inserted. For this reason, a grommet is attached to the object to be inserted to protect the wiring material from the periphery of the through hole and to close the gap between the through hole and the wiring material in order to prevent liquid from entering the gap. For example, the grommet is composed of a base member made of a hard synthetic resin material and an annular water-stopping member made of a flexible synthetic resin material such as rubber, and is inserted into the through hole to bring the water-stopping member into close contact with the periphery of the through hole in the object to be inserted. The wiring material is wired between one space and the other space through the inside of the base member. The base member is provided with a tubular body through which the wiring material passes inside. Therefore, in the grommet, the base member is divided into a first base member and a second base member, which makes it easy to arrange the wiring material in the wiring path inside the base member. In this grommet, a seal member is sandwiched between the joint surfaces of the first base member and the second base member to prevent liquid from entering through the joint surfaces. For example, the following Patent Document 1 discloses a grommet configured in this way. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-251769 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of grommet, the wiring material is pulled out from the opening of the tubular body, and in order to close the gap between the opening and the wiring material, a waterproof tape is wrapped around the tubular body and the wiring material from the front to the rear of the opening. However, in this grommet, when the waterproof tape is wrapped around the tubular body and the wiring material, the first base member and the second base member are already assembled with their joint surfaces aligned, so that the position of the seal member provided on the joint surface is difficult to confirm from the outside, and the end position of the seal member between the joint surfaces of the tubular body is difficult to determine. In this grommet, suitable waterproofing between the joint surfaces is obtained by covering the end position of the seal member with the waterproof tape, but because the end position is difficult to determine, it is difficult to determine whether the waterproof tape is wrapped around the joint surfaces. In addition, in the grommet, the destination of the wiring material pulled into one space from the through hole of the insertion object can be directed based on the bending direction of the tubular body of the base member bent in one space. However, in this grommet, since the tubular body is bent, the position where the waterstop tape can be wound on the tubular body side is limited to the straight pipe part on the opening side. In this grommet, the space where the waterstop tape can be wound is determined by the shape of the tubular body, such as the bending position and bending shape, and the surrounding shape of the tubular body in the base member, so the position where the waterstop tape can be wound in the straight pipe part may be further limited. Therefore, in this grommet, the range of positions where the waterstop tape can be wound is narrow compared to the axial length of the tubular body, and in addition, the end position of the waterstop tape on the tubular body side must be restricted depending on the end position of the seal member, so there is room for improvement in ensuring waterproofing.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a grommet that can ensure waterproofing. [Means for solving the problem]

[0006] The present invention provides a base member having a plurality of divided base members made of a synthetic resin material radially divided around the axis of an insertion passage, the base member allowing a conductive wiring material to be passed through a through hole of an object to be inserted between one space and the other space into the inner insertion passage formed by joining the mutually facing joint surfaces of the plurality of divided base members, an annular grommet body that is assembled to the base member and disposed in the one space at a position where attachment to the peripheral portion of the through hole of the object to be inserted is completed, and a seal member that is sandwiched between the mutually facing joint surfaces of the plurality of divided base members and fills a gap between the joint surfaces at the sandwiched position, the base member being disposed in the one space at the completion of attachment, an annular flange that is disposed coaxially opposite an annular plane on the one space side of the annular peripheral portion with a gap therebetween, and each of the divided base members. and a tubular body formed by combining pipes and pulling the wiring material of the inner insertion passage from an opening into one of the spaces, wherein the grommet body is made of an elastically deformable synthetic resin material that is softer than the base member, and is provided with an annular water-stopping member that is arranged coaxially between the flange and the annular flat surface of the peripheral portion at the completed installation position and is in close contact with the annular flat surface over the entire circumference, wherein the tubular body has a bent portion that protrudes coaxially from the flange and is bent at its end, and a straight pipe portion in which the opening is provided, and the opening is sealed with a water-stopping tape wrapped around between the outer peripheral surface of the straight pipe portion and the wiring material pulled out from the opening, and the straight pipe portion is provided with a tape position designation portion that designates the allowable range of the end position of the water-stopping tape on the straight pipe portion side, at the outer peripheral surface and at the location where the sealing member is arranged between the inner joint surfaces. Effect of the Invention

[0007] In the grommet of the present invention, the water stop tape can be wound around the straight pipe section up to the tape position designation section, thereby sealing the gap between the joint surfaces at the end of the straight pipe section on the opening side with the water stop tape. Therefore, the water stop tape can ensure the waterproofing of the grommet. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a grommet according to an embodiment before it is attached to an object to be inserted. [Diagram 2] FIG. 2 is a plan view of the grommet of the embodiment as viewed from the side. [Diagram 3] FIG. 3 is a perspective view of the grommet of the embodiment as viewed from a different angle. [Figure 4] FIG. 4 is an exploded perspective view showing the grommet of the embodiment. [Diagram 5] FIG. 5 is an exploded perspective view of a divided base member and a seal member according to the embodiment. [Figure 6] FIG. 6 is a perspective view illustrating winding of the waterproof tape. [Figure 7] FIG. 7 is a plan view illustrating the winding of the waterproof tape. [Figure 8] FIG. 8 is a plan view for explaining the definition of the first end of the tape position designation portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a grommet according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to this embodiment.

[0010] [Embodiment] One embodiment of a grommet according to the present invention will be described with reference to FIGS.

[0011] Reference numeral 1 in Fig. 1 to Fig. 4 indicates a grommet of this embodiment. This grommet 1 protects a conductive wiring material We passing through a through hole 502 of an object to be inserted 501 between one space S1 and the other space S2 from a peripheral portion 503 of the through hole 502 in the object to be inserted 501, and prevents liquid (water, etc.) from entering a gap between the annular peripheral portion 503 and the wiring material We (Fig. 1). Therefore, this grommet 1 is attached to the peripheral portion 503 of the through hole 502 of the object to be inserted 501 after the wiring material We is inserted therethrough.

[0012] Here, the wiring material We refers to, for example, an electric wire (an electric wire as a communication line, an electric wire as a power supply line, etc.). The insertion object 501 refers to a member for inserting the wiring material We, and in the case of a vehicle, refers to a wall such as a panel of the body. The wiring material We is routed between one space S1 and the other space S2 separated by the insertion object 501 by inserting it through a through hole 502 of the insertion object 501. For example, the wiring material We is responsible for communication between the devices in the one space S1 and the other space S2, and for supplying power to electrical equipment in the one space S1 from a power source in the other space S2.

[0013] A peripheral portion 503 of a through hole 502 of an object to be inserted 501 has an annular flat plate portion (hereinafter referred to as an "annular flat plate portion") 504 and an annular protrusion portion (hereinafter referred to as an "annular protrusion portion") 505 protruding from an end portion (inner peripheral edge portion 504a) of the inner peripheral edge of the annular flat plate portion 504 toward the other space S2 (FIG. 1). The grommet 1 is attached to the annular flat plate portion 504 and the annular protrusion portion 505 at the peripheral portion 503. For example, the object to be inserted 501 is formed by press molding, at which time the annular flat plate portion 504 and the through hole 502 are formed. Then, in the object to be inserted 501, the annular protrusion portion 505 is formed by burring the peripheral edge of the through hole 502. Here, since the through hole 502 is formed in a circular shape, the annular flat plate portion 504 and the annular protrusion portion 505 are each formed in an annular shape.

[0014] The grommet 1 includes a base member 10X through which the wiring material We is inserted into an inner insertion passage (FIGS. 1 to 8). The base member 10X includes a plurality of divided base members radially divided around the axis of the insertion passage, and is formed by assembling the plurality of divided base members together. In the base member 10X, the opposing joint surfaces of the plurality of divided base members are joined together to form an insertion passage on the inside. The plurality of divided base members may be members having different shapes, or may be the same members having the same shape. In this embodiment, the base member 10X is made up of two divided base members, a first divided base member and a second divided base member. Here, the two divided base members are the same members (divided base members 10, 10) having the same shape (FIGS. 1 to 8).

[0015] This base member 10X has an annular flange 20, a cylindrical body 30, and a tubular body 40 on the same axis, and the wiring material We is inserted inside these (FIGS. 1 to 8). Here, on the same axis, the cylindrical body 30 protrudes in one direction from the flange 20, and the tubular body 40 protrudes in the other direction from the flange 20.

[0016] In the base member 10X shown here, as described below, the annular flange 20, the cylindrical body 30, and the tubular body 40 are coaxially formed by the divided base members 10, 10 that are assembled together. For this reason, a holding mechanism (hereinafter referred to as a "base holding mechanism") 50 that holds the two divided base members 10, 10 in an assembled state is provided between the two divided base members 10, 10 adjacent to each other around the axis of the insertion passage (FIGS. 1 to 3).

[0017] Furthermore, this grommet 1 includes an annular grommet body 60 that is assembled to a base member 10X (split base members 10, 10 assembled to each other) (FIGS. 1 to 4 and 6 to 8). This grommet body 60 is disposed in one space S1 at a position where mounting of the grommet 1 to the peripheral portion 503 is completed, so as to prevent infiltration of liquid (water, etc.) from one space S1 into the other space S2 via the through-hole 502. Note that in the following, when the term "mounting completion position" is used simply, this refers to the position where mounting of the grommet 1 to the peripheral portion 503 is completed.

[0018] The base member 10X (split base members 10, 10) is molded using an insulating hard synthetic resin material (hereinafter, referred to as "hard resin"). Here, the base member 10X (split base members 10, 10) is molded using a hard resin such as plastic, for example.

[0019] The two split base members 10, 10 are assembled by matching their joint surfaces 10a together (FIGS. 4 and 5). The two split base members 10, 10 sandwich the wiring material We in the assembled state, and the wiring material We is inserted into the inner insertion passage. Here, by assembling the two split base members 10, 10, a circular ring-shaped flange 20, a cylindrical tubular body 30, and a circular pipe-shaped tubular body 40 are formed.

[0020] The flange 20 is disposed in one space S1 at the installation completion position, and is disposed coaxially opposite to the annular flat surface 503a (FIG. 1) on the one space S1 side of the peripheral edge portion 503 with a gap. This annular flat surface 503a is provided on the annular flat plate portion 504. The annular flat surface 503a shown here is the annular flat surface on the one space S1 side of the annular flat plate portion 504 itself. The flange 20 is disposed coaxially opposite to the annular flat surface 503a with a gap in the hole axis direction of the through hole 502 at the installation completion position with the annular outer peripheral edge portion (hereinafter referred to as the "flange outer peripheral edge portion") 20a side. The flange 20 has the wiring material We inserted inside the annular inner peripheral edge portion (hereinafter referred to as the "flange inner peripheral edge portion") 20b.

[0021] The flange 20 is formed in a plate shape. Therefore, an annular wall surface (hereinafter referred to as "flange surface") 20c is provided on the flange outer peripheral edge portion 20a side of the flange 20, which is arranged coaxially opposite the annular flat surface 503a with a gap therebetween at the installation completion position (FIG. 4). Here, the flange 20 is formed in an annular shape.

[0022] The flange 20 is formed by combining the respective split flanges 11 of the multiple split base members 10 (FIGS. 1 to 8). Here, the joint surfaces 10a of the two split base members 10, 10 are brought together to form the flange 20 from the respective split flanges 11. The split flange 11 shown here is formed by dividing the flange 20 in half along the central axis, and is formed in a semicircular arc shape.

[0023] The tubular body 30 is coaxially protruded from the flange 20 toward the other space S2, and is inserted into the through hole 502 at the installation completion position. That is, in this tubular body 30, the tip end protruding from the flange 20 is disposed in the other space S2. This tubular body 30 is formed in a cylindrical shape. The tubular body 30 is protruded from between the flange outer peripheral edge portion 20a and the flange inner peripheral edge portion 20b of the flange 20, and the wiring material We is inserted into the inside of the tubular body 30 (FIG. 4). Here, for example, the flange 20 is divided into two in the radial direction into the flange outer peripheral edge portion 20a side and the flange inner peripheral edge portion 20b side, and the tubular body 30 is protruded from the boundary portion between the flange outer peripheral edge portion 20a side and the flange inner peripheral edge portion 20b side.

[0024] The cylindrical body 30 is formed by combining the respective split tubes 12 of the multiple split base members 10 (FIGS. 2 to 8). Here, the joining surfaces 10a of the two split base members 10, 10 are brought together to form the cylindrical body 30 from the respective split tubes 12. The split tube 12 shown here is formed by splitting the cylindrical body 30 in half along the central axis, and is formed in a semicircular arc shape.

[0025] The tubular body 40 protrudes from the flange 20 coaxially in the opposite direction to the cylindrical body 30, and the wiring material We in the inner insertion passage is pulled out from an opening 40a (FIGS. 1 to 3 and 6 to 8) into one space S1. This tubular body 40 is formed in a circular tube shape. The tubular body 40 shown here protrudes from the flange inner peripheral edge portion 20b of the flange 20, and the wiring material We is inserted into the inner insertion passage (FIGS. 1 and 3 to 5).

[0026] This tubular body 40 has a bent portion 41 that is coaxially protruding from the flange 20 and bent at its tip (FIGS. 1 to 8). The tubular body 40 may have the bent portion 41 at one location, or may have the bent portions 41 at multiple locations. This tubular body 40 also has a straight pipe portion 42 in which an opening 40a is provided (FIGS. 1 to 8). The tubular body 40 shown here is bent immediately after protruding coaxially from the flange 20, and an opening 40a is provided in the straight pipe portion 42 at the bent tip. In other words, the tubular body 40 shown here has a straight pipe section at the base side (hereinafter referred to as the "straight pipe section at the base side") 43 that protrudes coaxially from the flange 20, a straight pipe section at the tip side (hereinafter referred to as the "straight pipe section at the tip side") 42 in which an opening 40a is provided, and one bent section 41 sandwiched between the straight pipe section at the base side 43 and the straight pipe section at the tip side 42 (Figures 1 to 8).

[0027] The tubular body 40 is formed by combining the split tubes 13 of the multiple split base members 10 (FIGS. 1 to 8). Here, the joining surfaces 10a of the two split base members 10, 10 are brought together to form the tubular body 40 from the split tubes 13. The split tube 13 shown here is obtained by splitting the tubular body 40 in half along the central axis, and is formed in a semicircular arc shape.

[0028] As described above, the split base member 10 has a high hardness such that its main parts (split flange 11, split cylinder 12, split pipe 13) are not easily deformed elastically. For this reason, there is a possibility that this split base member 10 may form a minute gap between the joint surface 10a of the mating split base member 10 due to, for example, the surface roughness of the joint surface 10a. Therefore, the grommet 1 of this embodiment is provided with a seal member 71 that is clamped between the opposing joint surfaces 10a of the multiple split base members 10 and fills the gap between the joint surfaces 10a at the clamped position (FIGS. 4 and 5).

[0029] The seal member 71 is made of a synthetic resin material (hereinafter referred to as "soft resin") that is softer and elastically deformable than the hard resin of the divided base member 10, and is provided on at least one of the mutually facing joint surfaces 10a. The seal member 71 is molded using a synthetic resin material such as an elastomer. The seal member 71 is provided, for example, across each of the joint surfaces 10a of the divided flange 11, the divided cylinder 12, and the divided pipe 13. In the divided base member 10 shown here, grooves 10b are formed on two joint surfaces 10a from the divided flange 11 to the divided pipe 13, and the seal member 71 is fitted into each of the grooves 10b (FIG. 5). The seal member 71 protrudes from the grooves 10b. For example, the seal member 71 is molded integrally with the divided base member 10 by two-color molding with the divided base member 10, or by insert molding with the divided base member 10 placed in a mold. Also, the seal member 71 may be molded as a separate part from the divided base member 10 and attached with an adhesive or the like to the groove portion 10b of the divided base member 10. In this base member 10X, by assembling the two divided base members 10, 10, the seal member 71 protruding from the groove portion 10b of each joint surface 10a of one divided base member 10 is brought into close contact with each joint surface 10a of the other divided base member 10.

[0030] The base holding mechanism 50 is a holding mechanism for holding the two split base members 10, 10 with their respective joint surfaces 10a mated. The base holding mechanism 50 shown here is provided at multiple locations between the two split base members 10, 10. For example, the base holding mechanism 50 shown here includes a piece 51 protruding from the joint surface 10a of one of the two split base members 10, 10, and a claw-shaped first locking portion 52 protruding from a wall surface of the piece 51 (FIG. 4). The base holding mechanism 50 shown here is provided with an insertion opening 53 provided on the other joint surface 10a of the two divided base members 10, 10, into which one piece 51 and first locking portion 52 are inserted, and a second locking portion 54 provided on the other of the two divided base members 10, 10, which is disposed opposite the first locking portion 52 when the joint surfaces 10a of the two divided base members 10, 10 are brought together, and which holds the two divided base members 10, 10 in a state in which the joint surfaces 10a of the two divided base members 10, 10 are brought together (FIG. 4). The second locking portion 54 is pushed by the first locking portion 52 inserted from the insertion opening 53 and bends, and when the joint surfaces 10a of the two divided base members 10 are brought together, the first locking portion 52 separates to release the bending.

[0031] Each of the two split base members 10, 10 shown here has a pair of a piece 51 and a first locking portion 52 at one circumferential end of the split tube 12, and a pair of an insertion opening 53 and a second locking portion 54 at the other circumferential end of the split tube 12. With the joint surfaces 10a of the two split base members 10, 10 facing each other, the first locking portion 52 at one end of one split tube 12 is locked to the second locking portion 54 at the other end of the other split tube 12, and the second locking portion 54 at the other end of one split tube 12 is locked to the first locking portion 52 at one end of the other split tube 12. In other words, the two split base members 10, 10 have base holding mechanisms 50 at two locations that connect the split tubes 12 and hold them in the connected state. Furthermore, each of the two split base members 10, 10 has a set of a piece portion 51 and a first locking portion 52 at one circumferential end of the split pipe 13, and a set of an insertion opening 53 and a second locking portion 54 at the other circumferential end of the split pipe 13. With the joint surfaces 10a of the two split base members 10, 10 facing each other, the first locking portion 52 at one end of one split pipe 13 is locked to the second locking portion 54 at the other end of the other split pipe 13, and the second locking portion 54 at the other end of one split pipe 13 is locked to the first locking portion 52 at one end of the other split pipe 13. In other words, the two split base members 10, 10 are provided with base holding mechanisms 50 at two locations that connect the split pipes 13 and hold them in the connected state. Here, the two base holding mechanisms 50 are provided on the straight pipe portion 43 on the base side of the tubular body 40 .

[0032] In the base member 10X (divided base members 10, 10 assembled together), the wiring material We is pulled out from the opening 40a of the tubular body 40 to one space S1, and the wiring material We is pulled out from the opening of the cylindrical body 30 to the other space S2. In this grommet 1, the gap between the flange 20 of the base member 10X (divided base members 10, 10 assembled together) and the annular flat surface 503a of the peripheral portion 503 is blocked by the grommet body 60 to prevent the infiltration of liquid (water, etc.) from one space S1 to the other space S2 via the through hole 502. In this grommet 1, the opening 40a of the tubular body 40 is blocked by a waterproof tape Tp to prevent the infiltration of liquid (water, etc.) from the opening 40a into the insertion passage inside the tubular body 40 (FIGS. 2 and 6 to 8).

[0033] The grommet body 60 includes an annular water-stopping member 60A made of soft resin (i.e., an elastically deformable synthetic resin material softer than the hard resin of the base member 10X (split base member 10)) and an annular support member 60B made of a synthetic resin material harder than the soft resin of the water-stopping member 60A and integrated with the water-stopping member 60A (FIGS. 1 to 4 and 6 to 8). The water-stopping member 60A is molded using a synthetic resin material such as an elastically deformable elastomer that is softer than the hard resin of the base member 10X (split base member 10) and the support member 60B. The support member 60B is made of the same hard resin as the base member 10X (split base member 10) or a different hard resin having the same hardness as the hard resin of the base member 10X (split base member 10), and is molded using a synthetic resin material such as plastic.

[0034] The grommet body 60 is configured as a molded product in which the water-stopping member 60A and the support member 60B are molded integrally. In the grommet body 60, the water-stopping member 60A is integrated with the support member 60B. For example, the water-stopping member 60A is produced by two-color molding with the support member 60B in a mold, or is insert molded into the support member 60B housed in a mold, and is molded integrally with the support member 60B. The water-stopping member 60A may also be molded as a separate part from the support member 60B, and attached to the support member 60B with an adhesive or the like.

[0035] This grommet body 60 is assembled to a base member 10X (divided base members 10, 10 assembled together) via a support member 60B.

[0036] The water-stopping member 60A is brought into close contact with the flange 20 coaxially at the assembly completion position with the base member 10X (divided base members 10, 10 assembled together), and is arranged coaxially between the flange 20 and the annular flat surface 503a of the peripheral portion 503 at the installation completion position, and is brought into close contact with the annular flat surface 503a over the entire circumference. This water-stopping member 60A has, for example, an annular lip (not shown) that elastically deforms at the assembly completion position to come into close contact with the flange surface 20c of the flange 20 coaxially over the entire circumference. This water-stopping member 60A also has an annular outer peripheral lip 61 and an annular inner peripheral lip 62 that elastically deforms at the installation completion position to come into close contact with the annular flat surface 503a of the peripheral portion 503 over the entire circumference (FIGS. 1 to 4). In the following description, when the term "assembly completion position" is used simply, this refers to the position where the assembly of the base member 10X (the divided base members 10, 10 assembled together) and the grommet body 60 is completed.

[0037] The support member 60B is molded as an annular member that is integrated with the outer peripheral edge of the water-stopping member 60A and coaxially protrudes from the outer peripheral edge toward the flange outer peripheral edge 20a of the flange 20 (FIGS. 1 to 4 and 6 to 8). The support member 60B is molded in an annular shape.

[0038] Between the base member 10X (split base members 10, 10 assembled together) and the support member 60B, an engagement mechanism 80 is provided that engages a first engagement portion 81 provided on the base member 10X (split base members 10, 10 assembled together) with a second engagement portion 82 provided on the support member 60B to hold the base member 10X (split base members 10, 10 assembled together) and the grommet body 60 at the assembly completion position (FIGS. 1 to 4). The first engagement portion 81 is formed as a claw-shaped protrusion that protrudes radially outward from the flange outer peripheral edge portion 20a of the flange 20. The second engagement portion 82 is a through hole formed in the support member 60B, and the first engagement portion 81 is inserted at the assembly completion position and engaged with its inner peripheral wall surface. A plurality of such engagement mechanisms 80 are provided around the axis of the cylindrical shaft of the base member 10X (split base members 10, 10 assembled together). Here, four of these engagement mechanisms 80 are provided at equal intervals around the axis of the cylindrical shaft of the base member 10X, two of which are provided on the split flange 11 of one split base member 10, and the remaining two are provided on the split flange 11 of the other split base member 10.

[0039] The water stop tape Tp is wrapped around the axis of the outer circumferential surface 40b of the tubular body 40 (FIGS. 2 and 6 to 8). The opening 40a of the tubular body 40 is closed with the water stop tape Tp wrapped between the outer circumferential surface 40b of the tip-side straight pipe portion 42 and the wiring material We pulled out from the opening 40a.

[0040] The wire harness WH of this embodiment includes a plurality of wiring materials We, and the entirety or at least a part of the plurality of wiring materials We, except for both ends, is bundled together by an exterior part such as a corrugated tube or a resin tape. The plurality of wiring materials We shown here are covered by a corrugated tube COT (FIGS. 1 to 4 and 6 to 8) inside the distal end straight pipe portion 42, and are pulled out from the opening 40a together with the corrugated tube COT. Therefore, the water stop tape Tp shown in this example is wound between the outer circumferential surface 40b of the distal end straight pipe portion 42 and the outer circumferential surface COTa of the corrugated tube COT as an exterior part pulled out from the opening 40a (FIGS. 2 and 6 to 8).

[0041] The tip-side straight pipe section 42 has an annular protrusion 42a that protrudes from its inner peripheral surface in a circular shape over one revolution in the circumferential direction and fits into an annular valley portion COT1 of the corrugated tube COT inside the pipe (FIG. 4). The tip-side straight pipe section 42 has a plurality of annular protrusions 42a spaced apart coaxially, and the plurality of protrusions 42a hold the corrugated tube COT inside the pipe.

[0042] Here, the groove 10b of the joint surface 10a of the split pipe 13 is formed up to the opening 40a so as not to penetrate the end surface of the split pipe 13 on the opening 40a side in consideration of waterproofing. Therefore, the seal member 71 is arranged from the split flange 11 to the split pipe 13 along the joint surface 10a, but stops just before the opening 40a. Therefore, in the tubular body 40, a gap is formed between the joint surface 10a at the tip of the tip side straight pipe section 42 on the opening 40a side. For this reason, in the tip side straight pipe section 42, the waterproof tape Tp is wrapped up to the place where the seal member 71 is arranged between the inner joint surfaces 10a. Therefore, in this tip side straight pipe section 42, a tape position designation section 44 is provided on the outer circumferential surface 40b and at the place where the seal member 71 is arranged between the inner joint surfaces 10a, which designates the allowable range of the end position of the waterproof tape Tp on the tip side straight pipe section 42 side (FIGS. 1 to 8). As a result, in the grommet 1 of this embodiment, by wrapping the waterproof tape Tp around the tip-side straight pipe section 42 up to the tape-position designation section 44 using the tape-position designation section 44 as a marker, the gap between the joint surfaces 10a at the tip of the opening 40a side of the tip-side straight pipe section 42 can be sealed with the waterproof tape Tp. Therefore, the grommet 1 of this embodiment can ensure waterproofing by the waterproof tape Tp.

[0043] The tape position designation section 44 has a first end 44a indicating the allowable limit position of the end position of the waterstop tape Tp on the bent portion 41 side, and a second end 44b indicating the allowable limit position of the end position of the waterstop tape Tp on the opening 40a side (FIGS. 1 to 8). The tape position designation section 44 indicates the allowable range (the allowable range of the end position on the tip side straight pipe section 42 side of the waterstop tape Tp) with the first end 44a and the second end 44b. The seal member 71 is arranged between the inner joint surface 10a between the first end 44a and the second end 44b, and is connected from the bent portion 41 side of the first end 44a to the opening 40a side of the second end 44b. In other words, the second end 44b is provided on the bent portion 41 side of the end of the seal member 71 on the opening 40a side. Therefore, in the grommet 1 of this embodiment, the waterproof tape Tp can be wrapped around the tape position designated portion 44 of the straight pipe section 42 at the tip end, so that the waterproof tape Tp is wrapped around the sealing member 71 in a manner that covers it (Figures 2, 6 and 7).

[0044] As described above, in the grommet 1, the space in which the waterstop tape Tp can be wound is determined by the shape of the tubular body 40, such as the bending position and shape, and the peripheral shape of the tubular body 40 in the base member 10X (the divided base members 10, 10 assembled together), so the position in which the waterstop tape Tp can be wound in the straight pipe section 42 on the tip side is limited. In this example, for example, the flange 20 gets in the way of the winding of the waterstop tape Tp, and the waterstop tape Tp cannot be wound up to the end of the straight pipe section 42 on the bent section 41 side on the tip side. Therefore, the first end 44a is provided at a work limit position where the waterstop tape Tp can be wound on the bent section 41 side. In this example, the work limit position is the position closest to the bent section 41 where the waterstop tape Tp does not hit the flange 20 when winding the waterstop tape Tp, and the first end 44a is provided at this work limit position (FIG. 8). This makes it possible to easily wrap the waterproof tape Tp around the grommet 1.

[0045] For example, the first end 44a is formed as an annular protrusion that protrudes from the outer circumferential surface 40b of the tip-side straight pipe portion 42 in the circumferential direction. When the waterstop tape Tp is wrapped around the first end 44a, it may rise from the outer circumferential surface 40b around the first end 44a, causing a gap between the first end 44a and the outer circumferential surface 40b. For this reason, in the grommet 1, by wrapping the waterstop tape Tp with the second end 44b side closer to the first end 44a as the end position, the waterstop tape Tp at the end position can be tightly attached to the outer circumferential surface 40b, thereby ensuring the waterproofing provided by the waterstop tape Tp.

[0046] Also, for example, the second end 44b is formed as an annular groove portion by recessing the outer circumferential surface 40b of the tip-side straight pipe portion 42 in the circumferential direction. As a result, in the grommet 1, the waterproof tape Tp is wound from above the second end 44b, and the waterproof tape Tp can be made to adhere closely to the outer circumferential surface 40b even around the second end 44b, so that the waterproofing provided by the waterproof tape Tp can be ensured.

[0047] The grommet 1 configured in this manner includes a retention mechanism 90 that retains the assembled base member 10X (divided base members 10, 10 assembled together) and the grommet body 60 on a peripheral portion 503 of a through hole 502 in an object to be inserted 501 (FIGS. 2 and 3). The retention mechanism 90 shown here utilizes a resilient force accompanying elastic deformation of the outer peripheral lip 61 and inner peripheral lip 62 of the water-stopping member 60A, and holds the grommet 1 on the peripheral portion 503 by sandwiching the peripheral portion 503 between the outer peripheral lip 61, inner peripheral lip 62 and an engaging portion 91 provided on the base member 10X (base member 10) described below.

[0048] The base member 10X has a locking portion 91 that protrudes from the outer circumferential surface 30a of the cylindrical body 30 in the other space S2 at the attachment completion position and that contacts the peripheral edge portion 503 from the other space S2 side in the other space S2 at the attachment completion position (FIGS. 2 and 3). The locking portion 91 locks a part of the peripheral edge portion 503 in the circumferential direction. Therefore, the base member 10X has a plurality of locking portions 91 in the circumferential direction of the cylindrical body 30.

[0049] The base member 10X also has a cantilevered locking piece 92 with a locking portion 91 at its free end in the other space S2 at the installation completion position (FIGS. 2 and 3). The locking piece 92 protrudes from the fixed end on the outer circumferential surface 30a side of the cylindrical body 30 to the one space S1 side in the other space S2 at the installation completion position, and the free end side protrudes from the outer circumferential surface 30a of the cylindrical body 30 (initial shape). The locking piece 92 is formed to have flexibility that allows it to bend and deform so as to change the amount of protrusion from the outer circumferential surface 30a on the free end side. The locking piece 92 moves back and forth through the notch portion 30b, which is a cutout portion of the cylindrical body 30, by its bending deformation (FIGS. 2 and 3). A plurality of combinations of locking portions 91, locking pieces 92, and notches 30b are provided at equal intervals in the circumferential direction of the cylindrical body 30. The cylindrical body 30 shown here has three combinations of locking portions 91, locking pieces 92, and notches 30b provided at equal intervals in the circumferential direction.

[0050] When the cylindrical body 30 is inserted into the through hole 502 from one space S1, the locking piece 92 is subjected to a force from the annular protrusion 505 of the peripheral portion 503, and is deformed from its initial shape toward the notch 30b, passes through the position of the annular protrusion 505, and advances to the tip (hereinafter referred to as the "locking end") 505a (FIG. 1) of the annular protrusion 505, and begins to return to its initial shape when the force from the annular protrusion 505 is removed. Therefore, the locking piece 92 is disposed at the tip of the locking end 505a of the annular protrusion 505 together with the locking portion 91. Meanwhile, in the water-stopping member 60A, when a series of movements of the locking portion 91 and the locking piece 92 occurs, the outer peripheral lip 61 and the inner peripheral lip 62 come into contact with the annular flat surface 503a of the peripheral portion 503 and are elastically deformed. Therefore, when the force for inserting the grommet 1 into the through hole 502 (so-called insertion force) is removed, the grommet 1 moves back toward one of the spaces S1 due to the elastic force caused by the elastic deformation of the outer peripheral lip 61 and the inner peripheral lip 62. Accordingly, the locking portion 91 comes into contact with the locking end 505a of the annular protrusion 505 and is locked by this locking end 505a. In other words, the annular protrusion 505 locks the locking portion 91 at the tip (locking end 505a) of the end protruding from the annular flat plate portion 504. The annular locking end 505a locks the locking portion 91 at each location in the circumferential direction. Therefore, the peripheral portion 503 is sandwiched by the outer peripheral lip 61 and the inner peripheral lip 62 of the water-stopping member 60A and the locking portions 91 of the base member 10X (split base members 10, 10).

[0051] 1 Grommet 10X Base material 10 Split base member 10a Joint surface 13 Split tube 20 Flange 40 Tubular body 40a opening 40b Outer surface 41 Bend 42 Straight pipe section 44 Tape position specification section 44a First end 44b Second end 60 Grommet body 60A Water-stopping material 71 Sealing material 501 Insertion object 502 Through hole 503 Periphery 503a Circular Plane Tp Waterproof Tape S1 One side of the space S2 The other space We wiring material

Claims

1. a base member including a plurality of divided base members made of a synthetic resin material radially divided around an axis of an insertion passage, the base member allowing a conductive wiring material to be passed through an insertion passage formed on the inside by joining the mutually facing joint surfaces of the plurality of divided base members and passing through a through hole of an object to be inserted between one space and the other space; an annular grommet body that is assembled to the base member and disposed in the one space at a position where attachment to a periphery of the through hole of the insertion object is completed; a seal member that is sandwiched between the mutually facing joint surfaces of the divided base members and fills a gap between the joint surfaces at the sandwiched position; Equipped with the base member has an annular flange that is disposed in the one space at the installation completion position and is disposed coaxially opposite to an annular plane of the annular peripheral portion of the one space with a gap therebetween, and a tubular body that is formed by combining respective divided tubes of the multiple divided base members and that draws the wiring material of the inner insertion passage from an opening into the one space, the grommet body is made of an elastically deformable synthetic resin material that is softer than the base member, and includes an annular water-stopping member that is coaxially disposed between the flange and the annular flat surface of the peripheral edge portion at the installation completion position and is in close contact with the annular flat surface over the entire circumference; The tubular body has a bent portion that is coaxially protruding from the flange and is bent at its tip, and a straight pipe portion in which the opening is provided, and the opening is closed with a waterproof tape wrapped around an outer circumferential surface of the straight pipe portion and the wiring material pulled out from the opening, A grommet characterized in that the straight pipe section is provided with a tape position designation portion on the outer surface where the sealing member is positioned between the inner joint surfaces, the tape position designation portion specifying the allowable range of the end position of the water-stopping tape on the straight pipe section side.

2. The grommet described in claim 1, characterized in that the tape position designation portion has a first end indicating the allowable limit position on the bent portion side of the end position of the waterstop tape, and a second end indicating the allowable limit position on the opening side of the end position of the waterstop tape, and that the first end and the second end indicate the allowable range.

3. the tape position designation unit has a first end portion indicating an allowable limit position on the bent portion side of the end position of the water stop tape, and a second end portion indicating an allowable limit position on the opening side of the end position of the water stop tape, and the allowable range is indicated by the first end portion and the second end portion; the first end portion is an annular protrusion portion protruding in a circumferential direction from the outer circumferential surface of the straight pipe portion, The grommet according to claim 1 , wherein the second end portion is an annular groove portion formed by recessing the outer circumferential surface of the straight pipe portion in a circumferential direction.

4. The first end is provided at a work limit position where the waterproof tape can be wrapped around the bent portion, The grommet according to claim 2 or 3, wherein the second end portion is provided closer to the bent portion than the end portion of the sealing member on the opening side.

5. The plurality of wiring materials are covered with an exterior part within the straight pipe portion, and are pulled out from the opening together with the exterior part, 4. The grommet according to claim 1, wherein the waterproof tape is wrapped around an outer circumferential surface of the straight pipe portion and an outer circumferential surface of the exterior part pulled out from the opening.

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