Grommet

Abstract

To reduce insertion force.SOLUTION: A water stop member 60A includes: an annular body 61 which is coaxially locked to a flange face 20c at an assembly completion position with a base member 10X; an annular outer peripheral lip 63 which is coaxially projected toward a peripheral edge part 503 from an inner peripheral edge part 61b of the body, is elastically deformed at an attachment completion position and is brought into close contact with an annular plane 503a of the peripheral edge part over one circumference; an annular inner peripheral lip 64 which is coaxially arranged closer to a cylindrical body 30 side than the outer peripheral lip and is brought into close contact with the annular plane over one circumference at the attachment completion position; and a connection body 65 which is arranged at the assembly completion position by leaving a space with the flange face, connects a root of the inner peripheral lip to the inner peripheral edge part of the body or / and the root of the body side in the outer peripheral lip, receives force from the inner peripheral lip at the attachment completion position and bends and deforms toward the flange face side.SELECTED DRAWING: Figure 4

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 draw the wiring material from one space separated by the object to be inserted to another space. 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. 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 a conventional grommet, a water-stopping member may be provided with an annular lip to improve water-stopping ability between the water-stopping member and the periphery of the through hole. The lip protrudes in the direction of insertion of the grommet into the through hole, and when the grommet is assembled to the periphery of the through hole, the lip abuts against the periphery and is deflected to make a tight contact. Therefore, in this type of grommet, the lip increases the insertion force into the through hole.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a grommet that allows for a reduction in the insertion force. [Means for solving the problem]

[0006] The present invention comprises a base member made of a synthetic resin material, through which a conductive wiring material is inserted inside to be passed through a through hole of an object to be inserted from one space to the other space, and an annular grommet body 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, the base member having an annular flange having an annular flange surface that is disposed in the one space at the attachment completion position and that is opposed to an annular flat surface of the annular peripheral portion of the one space side with a gap therebetween, and a cylindrical body that protrudes coaxially from the flange toward the other space and is inserted into the through hole at the attachment completion position, and a locking portion that protrudes beyond an outer circumferential surface of the cylindrical body in the other space at the attachment completion position and that contacts the peripheral portion from the other space side in the other space at the attachment completion position is disposed in a circumferential direction of the cylindrical body. the grommet body includes an annular water-stopping member made of an elastically deformable synthetic resin material softer than the base member, the water-stopping member including: an annular main body that is coaxially engaged with the flange surface at an assembly completion position with the base member; an annular outer peripheral lip that protrudes coaxially from an inner peripheral edge of the main body toward the peripheral edge and elastically deforms at the assembly completion position to fit closely to the annular flat surface of the peripheral edge over the entire circumference; an annular inner peripheral lip that is coaxially arranged closer to the cylindrical body than the outer peripheral lip and fits closely to the annular flat surface of the peripheral edge over the entire circumference at the assembly completion position; and a connector that is arranged with a gap from the flange surface at the assembly completion position, connects a root of the inner peripheral lip to a root of the inner peripheral edge of the main body and / or the outer peripheral lip on the main body side, and receives a force from the inner peripheral lip to be flexibly deformed toward the flange surface at the assembly completion position. the connecting body is formed in an annular shape arranged coaxially with respect to the flange surface at the completed assembly position, the outer peripheral lip protrudes coaxially from the main body toward the peripheral edge portion so as to be pulled away from the hole axis of the through hole as it approaches the peripheral edge portion, and the inner peripheral lip protrudes coaxially from the inner peripheral edge portion of the connecting body toward the peripheral edge portion, and is brought into close contact with the annular plane by receiving a resilient force accompanying the bending deformation of the connecting body. It is characterized by: Effect of the Invention

[0007] When the grommet of the present invention is attached to the peripheral portion of the through hole of the object to be inserted, the outer peripheral lip abuts against the annular flat surface of the peripheral portion and elastically deforms, and the inner peripheral lip abuts against the annular flat surface of the peripheral portion and elastically deforms the connecting body. The connecting body then bends toward the flange surface, which suppresses elastic deformation of the inner peripheral lip caused by being crushed by the annular flat surface of the peripheral portion. As a result, the grommet of the present invention makes it possible to reduce the insertion force required to insert the grommet into the through hole. [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 perspective view of the grommet of the embodiment as viewed from a different angle. [Diagram 3] FIG. 3 is a plan view of the grommet of the embodiment as viewed from the cylindrical body side. [Figure 4] FIG. 4 is a cross-sectional view taken along line XX in FIG. 3, and shows the state before attachment to the object to be inserted. [Diagram 5] FIG. 5 is a cross-sectional view taken along line XX in FIG. 3, and shows the state after attachment to the object to be passed through. [Figure 6] FIG. 6 is an exploded perspective view showing the grommet of the embodiment. [Figure 7] FIG. 7 is an exploded perspective view of the grommet of the embodiment as viewed from a different angle. [Figure 8] FIG. 8 is an exploded perspective view showing the grommet of the embodiment separated into two base members and a grommet body after assembly. [Figure 9] FIG. 9 is an exploded perspective view of the base member and the waterproof member according to the embodiment. [Figure 10] FIG. 10 is an exploded perspective view of the grommet body according to the embodiment. 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. 8 indicates a grommet of this embodiment. This grommet 1 protects the conductive wiring material We passing from one space S1 to the other space S2 through a through hole 502 of an object to be inserted 501 from a peripheral portion 503 of the through hole 502 in the object to be inserted 501, and prevents liquid (water, etc.) from entering the gap between the annular peripheral portion 503 and the wiring material We (Figs. 1, 4, and 5). 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 an inner peripheral edge of the annular flat plate portion 504 toward the other space S2 (FIGS. 1, 4, and 5). 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 comprises a base member 10X through which the wiring material We is inserted on the inside (FIGS. 1 to 9). This base member 10X may consist of one member, or may consist of multiple members assembled together. The base member 10X shown here comprises two base members (a first base member, a second base member) that are assembled together. These two base members may be members with different shapes, or each may be the same member with the same shape. In the grommet 1 shown here, the two base members are the same member with the same shape (base members 10, 10) (FIGS. 1 to 9).

[0015] This base member 10X has at least an annular flange 20 and a cylindrical body 30 coaxially, and the wiring material We is inserted inside these (FIGS. 1 and 3 to 9). The base member 10X shown here has a tubular body 40 coaxially in addition to the flange 20 and cylindrical body 30, and the wiring material We is inserted inside these (FIGS. 1, 2, and 4 to 9). Here, 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 on the same axis.

[0016] In the base member 10X shown here, as described below, the base members 10, 10 are assembled together to form an annular flange 20, a cylindrical body 30, and a tubular body 40 on the same axis. For this reason, a holding mechanism (hereinafter referred to as a "base holding mechanism") 50 for holding the two base members 10, 10 in their assembled state is provided between the two base members 10, 10 (FIGS. 1, 2, and 6 to 9).

[0017] Moreover, this grommet 1 includes an annular grommet body 60 that is assembled to a base member 10X (base members 10, 10 assembled to each other) (FIGS. 1 to 8 and 10). 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 (FIGS. 4 and 5). Note that hereinafter, when the term "mounting completion position" is simply used, this refers to the position where mounting of the grommet 1 to the peripheral portion 503 is completed.

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

[0019] The two base members 10, 10 are assembled by matching their joint surfaces 10a (FIGS. 3, 6, 7, and 9). The two base members 10, 10 sandwich the wiring material We in the assembled state, and the wiring material We is inserted through them. Here, by assembling the two base members 10, 10, an annular flange 20, a cylindrical tubular body 30, and a circular tubular body 40 are formed. Note that a straight tubular body 40 is taken as an example here. However, the tubular body 40 may be bent after protruding from the flange 20.

[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 on the one space S1 side of the peripheral edge portion 503 with a gap (FIG. 5). The 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 (FIGS. 4 and 5).

[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 (FIGS. 4 to 8). Here, the flange 20 is formed in an annular shape.

[0022] Each of the two base members 10, 10 has a split flange 11 that joins with each other's joint surfaces 10a to form a flange 20 (FIGS. 1 to 8). The split flange 11 shown here is obtained by splitting 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 (FIGS. 4 and 5). 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 (FIGS. 4 and 5). 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] Each of the two base members 10, 10 has a split tube 12 that joins the joint surfaces 10a to form a cylindrical body 30 (FIGS. 1 and 3 to 8). The split tube 12 shown here is obtained 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 (FIGS. 4 and 5). The tubular body 40 is formed in a circular tube shape. The tubular body 40 shown here protrudes from the inner peripheral edge portion 20b of the flange 20, and the wiring material We is inserted into it (FIGS. 4 and 5).

[0026] Each of the two base members 10, 10 has a split tube 13 that joins its joint surface 10a to form a tubular body 40 (FIGS. 1, 2, and 4 to 8). 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.

[0027] Here, the flange 20 of this example has a first flange portion 21 in the form of a circular plate connecting the flange outer peripheral edge portion 20a and the flange inner peripheral edge portion 20b, and a second flange portion 22 in the form of a circular plate arranged between the outer peripheral edge portion 21a side of the first flange portion 21 in the mounting completion position and the annular flat surface 503a of the peripheral portion 503 with a gap therebetween on the same axis as the outer peripheral edge portion 21a side and the annular flat surface 503a (FIGS. 1, 2, and 4 to 8). The second flange portion 22 has its outer peripheral edge portion 22a arranged radially closer to the hole axis of the through hole 502 than the outer peripheral edge portion 21a of the first flange portion 21, and has an outer diameter smaller than that of the first flange portion 21 (FIGS. 4 to 8). However, the outer peripheral edge portion 22a of the second flange portion 22 may be arranged at the same position as the outer peripheral edge portion 21a of the first flange portion 21 in the radial direction. The second flange portion 22 has its inner peripheral edge portion 22b connected to the outer peripheral surface 30a of the cylindrical body 30 (FIGS. 4 to 6 and 8). Thus, the flange 20 of this example has a double-wall structure formed by the outer peripheral edge portion 21a of the first flange portion 21 and the second flange portion 22 at the flange outer peripheral edge portion 20a side, and a single-wall structure formed by the inner peripheral edge portion 21b of the first flange portion 21 at the flange inner peripheral edge portion 20b side (FIGS. 4 to 8). In this flange 20, the cylindrical body 30 protrudes from the boundary between the outer peripheral edge portion 21a side and the inner peripheral edge portion 21b side of the first flange portion 21, and the cylindrical body 30 further protrudes from the inner peripheral edge portion 22b of the second flange portion 22. In the flange 20, the wall surface of the peripheral edge portion 503 of the second flange portion 22 on the annular flat surface 503a side becomes the flange surface 20c that is disposed coaxially opposite the annular flat surface 503a with a gap therebetween.

[0028] As described above, the main parts of the two base members 10, 10 (split flange 11, split cylinder 12, split pipe 13) are made of high hardness and are not easily elastically deformed. For this reason, the two base members 10, 10 may form minute gaps between their respective joint surfaces 10a due to, for example, the surface roughness of the joint surfaces 10a. Therefore, the grommet 1 of this embodiment is provided with a waterproof member 71 on at least one of the joint surfaces 10a of the two base members 10, 10, which 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 base members 10 and which eliminates the gap between the joint surfaces 10a (FIGS. 3, 6, 7, and 9).

[0029] The waterproof member 71 is molded using a synthetic resin material such as elastomer. The waterproof member 71 is provided over the joint surfaces 10a of the split flange 11, the split cylinder 12, and the split pipe 13. The base member 10 shown here has a groove 10b formed in one of the two joint surfaces 10a between the split flange 11 and the split pipe 13, and the waterproof member 71 is fitted into the groove 10b (FIG. 9). The waterproof member 71 protrudes from the groove 10b. For example, the waterproof member 71 is molded integrally with the base member 10 by two-color molding with the base member 10 or by insert molding with the base member 10 housed in a mold. The waterproof member 71 may also be molded as a separate part from the base member 10 and attached to the groove 10b of the base member 10 with an adhesive or the like. In this base member 10X, the two base members 10, 10 are assembled together, so that the waterproof member 71 protruding from the groove portion 10b of one joint surface 10a of one base member 10 is brought into close contact with the other joint surface 10a of the other base member 10.

[0030] The base holding mechanism 50 is a holding mechanism for holding the two base members 10, 10 in a state in which their joint surfaces 10a are aligned. The base holding mechanism 50 is provided at a plurality of locations between the two 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 base members 10, 10, and a claw-shaped first locking portion 52 protruding from a wall surface of the piece 51 (FIGS. 6 and 7). The base holding mechanism 50 shown here includes an insertion opening 53 provided on the joint surface 10a of the other of the two base members 10, 10, into which one piece 51 and the first locking portion 52 are inserted, and a second locking portion 54 provided on the other of the two base members 10, 10, which is disposed opposite the first locking portion 52 when the joint surfaces 10a of the two base members 10, 10 are brought together, and which holds the two base members 10, 10 in a state in which the joint surfaces 10a of the two base members 10, 10 are brought together (FIGS. 6 and 7). 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 base members 10 are brought together, the first locking portion 52 is moved away to release the bending, thereby eliminating the bending.

[0031] Each of the two 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 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 base members 10, 10 are provided with two base holding mechanisms 50 that connect the split tubes 12 and hold them in the connected state. Furthermore, each of the two 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 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 base members 10, 10 are provided with two base holding mechanisms 50 that connect the split pipes 13 and hold them in the connected state.

[0032] 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 (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, 2, 4 to 8, and 10). 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 (base member 10) and the support member 60B. The support member 60B is made of the same hard resin as the base member 10X (base member 10) or a different hard resin having the same hardness as the hard resin of the base member 10X (base member 10), and is molded using a synthetic resin material such as plastic.

[0033] 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.

[0034] This grommet body 60 is assembled to a base member 10X (base members 10, 10 assembled to each other) via a support member 60B.

[0035] The water-stopping member 60A has an annular main body 61 that is coaxially engaged with the flange surface 20c of the flange 20 at the completed assembly position with the base member 10X (the base members 10, 10 assembled together) (FIGS. 1, 2, 4 to 8, and 10). The main body 61 is formed in a circular plate shape. The main body 61 shown here has its outer peripheral edge portion 61a protruding radially beyond the second flange portion 22 and disposed opposite the outer peripheral edge portion 21a of the first flange portion 21 with a gap therebetween (FIGS. 4 and 5). In the following, when the term "completed assembly position" is used, it simply refers to the completed assembly position of the base member 10X (the base members 10, 10 assembled together) and the grommet main body 60.

[0036] The water-stopping member 60A shown here has an annular lip (hereinafter referred to as the "flange-side lip") 62 that elastically deforms at the assembly completion position to come into close contact with the flange surface 20c over the entire circumference on the same axis, and the main body 61 is engaged with the flange surface 20c via this flange-side lip 62 (FIGS. 4 and 5). Thus, at the assembly completion position of this water-stopping member 60A, the main body 61 is disposed coaxially opposite the flange surface 20c with a gap therebetween, and the flange-side lip 62 protrudes coaxially from the main body 61 toward the flange surface 20c.

[0037] Furthermore, the water-stopping member 60A has an annular outer peripheral lip 63 that protrudes from the inner peripheral edge 61b of the main body 61 coaxially toward the peripheral edge 503 and elastically deforms at the installation completion position to fit closely to the annular flat surface 503a of the peripheral edge 503 over the entire circumference (FIGS. 1 to 8 and 10). The outer peripheral lip 63 protrudes from the main body 61 coaxially toward the peripheral edge 503 so as to move away from the hole axis of the through hole 502 as it approaches the peripheral edge 503, and is flexibly deformed at the installation completion position to fit closely to the annular flat surface 503a of the peripheral edge 503 over the entire circumference (FIGS. 4 and 5). The outer peripheral lip 63 has two annular sub-lip portions 63b that protrude coaxially from the wall surface 63a on the inner side in the radial direction (FIGS. 4 and 5). This outer peripheral lip 63 is flexed and deformed from its base on the main body 61 side at the installation completion position, and the two sub-lip portions 63b are brought into close contact with the annular flat surface 503a of the periphery 503.

[0038] Furthermore, the water-stopping member 60A has an annular inner circumferential lip 64 that is coaxially arranged closer to the cylindrical body 30 than the outer circumferential lip 63 and that is brought into close contact with the annular flat surface 503a of the peripheral edge portion 503 over the entire circumference at the installation completion position (FIGS. 1, 3 to 8, and 10). The water-stopping member 60A has a connector 65 that is arranged at a distance from the flange surface 20c at the installation completion position (FIGS. 1, 3 to 8, and 10). The connector 65 connects the root of the inner circumferential lip 64 to the inner circumferential edge portion 61b of the main body 61 and / or the root of the outer circumferential lip 63 on the main body 61 side, and receives a force from the inner circumferential lip 64 at the installation completion position to bend and deform toward the flange surface 20c. The inner circumferential lip 64 is brought into close contact with the annular flat surface 503a of the peripheral edge portion 503 by receiving a resilient force accompanying the bending deformation of the connector 65.

[0039] One or more connectors 65 are provided on the water-stopping member 60A, and connect the inner peripheral edge 61b of the main body 61 and / or the base of the outer peripheral lip 63 on the main body 61 side to the inner peripheral lip 64. The connector 65 shown here connects the inner peripheral lip 64 to the base of the outer peripheral lip 63 on the main body 61 side. The connector 65 shown here is provided on the water-stopping member 60A, and is formed in an annular shape arranged coaxially with a gap relative to the flange surface 20c at the completed assembly position. The inner peripheral lip 64 protrudes from the inner peripheral edge of the connector 65 coaxially toward the peripheral edge 503. Here, the connector 65 is formed in an annular plate shape.

[0040] In this water-stopping member 60A, the flat surface of the main body 61, the flange-side lip 62, and the flat surface of the connector 65, which are to be located on the flange surface 20c side, are formed in a mold (not shown) in which one side in the axial direction of the water-stopping member 60A is the removal direction. Therefore, in this water-stopping member 60A, it is possible to improve the releasability when the mold is removed in the removal direction after molding.

[0041] Here, as described above, the outer peripheral lip 63 protrudes from the main body 61 toward the peripheral portion 503 so as to move away from the hole axis of the through hole 502 as it approaches the peripheral portion 503 on the same axis, and two annular sub-lip portions 63b protrude from the inner wall surface 63a in the radial direction on the same axis. And, as described above, the inner peripheral lip 64 protrudes from the inner peripheral portion of the connecting body 65 toward the peripheral portion 503 on the same axis. In this water-stopping member 60A, the radial inner side of the outer peripheral lip 63, the inner peripheral lip 64, and the flat surface on the peripheral portion 503 side of the connecting body 65 are formed by a mold (not shown) in which the other side in the axial direction of the water-stopping member 60A is the removal direction. Therefore, in this water-stopping member 60A, by defining the outer peripheral lip 63 and the inner peripheral lip 64 to have the following shapes, the load applied to the outer peripheral lip 63 and the inner peripheral lip 64 from the mold is reduced when the mold is removed in the removal direction after molding.

[0042] In the outer peripheral lip 63, the radially inner wall surface 63a is inclined so as to move away from the axis of the water-stopping member 60A (the hole axis of the through hole 502) as it approaches the peripheral portion 503. In addition, the radially inner wall surface of the sub-lip portion 63b is parallel to the axis of the water-stopping member 60A (the hole axis of the through hole 502), and the wall surface on the peripheral portion 503 side is a plane perpendicular to the axis of the water-stopping member 60A (the hole axis of the through hole 502), so that the cross section perpendicular to the circumferential direction is triangular. As a result, in the water-stopping member 60A, when the previous mold is removed in the removal direction after molding, the load applied to the outer peripheral lip 63 from the mold can be reduced. Therefore, in the water-stopping member 60A, the quality deterioration during molding of the outer peripheral lip 63 can be suppressed, and the water-stopping performance of the outer peripheral lip 63 can be ensured.

[0043] The inner lip 64 has a wall surface on the outer side (the outer lip 63 side) in the radial direction suspended from the connector 65. This reduces the load applied from the die to the outer side of the inner lip 64 in the radial direction when the die is removed in the removal direction after molding in the water-stopping member 60A. The inner lip 64 also inclines the wall surface on the inner side in the radial direction away from the axis of the water-stopping member 60A (the hole axis of the through hole 502) as it approaches the peripheral portion 503. This reduces the load applied from the die to the inner side of the inner lip 64 in the radial direction when the die is removed in the removal direction after molding in the water-stopping member 60A. By adopting such a shape for the inner lip 64, it reduces the load applied from the die when the die is removed in the removal direction after molding in the water-stopping member 60A. Therefore, the water-stopping member 60A can suppress the deterioration of the quality of the inner lip 64 during molding and ensure the water-stopping performance of the inner lip 64.

[0044] The support member 60B is molded as an annular member that is integrated with the outer peripheral edge 61a of the main body 61 of the water-stopping member 60A and coaxially protrudes from the outer peripheral edge 61a toward the flange outer peripheral edge 20a of the flange 20 (FIGS. 4 to 8 and 10). The support member 60B is molded in an annular shape. The support member 60B protrudes beyond the second flange portion 22 to a position that covers the annular gap between the first flange portion 21 and the second flange portion 22 from the outside in the radial direction.

[0045] Between the base member 10X (the base members 10, 10 assembled to each other) and the support member 60B, an engagement mechanism 80 is provided that engages a first engagement portion 81 provided on the base member 10X (the base members 10, 10 assembled to each other) with a second engagement portion 82 provided on the support member 60B to hold the base member 10X (the base members 10, 10 assembled to each other) and the grommet body 60 at the assembly completion position (FIGS. 1, 2, and 4 to 8). The first engagement portion 81 is formed as a claw-shaped protrusion that protrudes radially outward from the outer circumferential edge portion 22a of the second flange portion 22. 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 the inner circumferential wall surface. A plurality of such engagement mechanisms 80 are provided around the axis of the cylindrical shaft of the base member 10X (the base members 10, 10 assembled to each other). Here, four of the 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 base member 10, and the remaining two are provided on the split flange 11 of the other base member 10.

[0046] The grommet 1 configured in this manner includes a retention mechanism 90 that retains the assembled base member 10X (the assembled base members 10, 10) and the grommet body 60 on a peripheral portion 503 of a through hole 502 in an object to be inserted 501 (FIGS. 1 and 3 to 8). The retention mechanism 90 shown here utilizes a resilient force accompanying elastic deformation of the outer peripheral lip 63 and inner peripheral lip 64 of the water-stopping member 60A and the connector 65, and holds the grommet 1 on the peripheral portion 503 by sandwiching the peripheral portion 503 between the outer peripheral lip 63, the inner peripheral lip 64 and an engagement portion 91 provided on the base member 10X (base member 10) described below.

[0047] The base member 10X has a locking portion 91 that protrudes from the outer peripheral 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. 1 and 4 to 8). 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.

[0048] 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 (FIG. 1 and 3 to 8). 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 (FIG. 1 and 3 to 8). 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 four combinations of locking portions 91, locking pieces 92, and notches 30b provided at equal intervals in the circumferential direction. Here, each of the split tubes 12 of the base member 10 has two combinations of locking portions 91, locking pieces 92, and notches 30b.

[0049] 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 deflected and deformed from its initial shape toward the cutout portion 30b, passes through the position of the annular protrusion 505, and advances to the tip (hereinafter referred to as the "locking end") 505a (FIGS. 1, 4, and 5) 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, together with the locking portion 91, at the tip of the locking end 505a of the annular protrusion 505. On the other hand, in the water-stopping member 60A, when a series of movements of the locking portion 91 and the locking piece portion 92 occurs, the outer peripheral lip 63 abuts against the annular flat surface 503a of the peripheral portion 503 and elastically deforms, and the inner peripheral lip 64 abuts against the annular flat surface 503a of the peripheral portion 503 and elastically deforms the connecting body 65. 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 to one space S1 side due to the elastic force caused by the elastic deformation of the outer peripheral lip 63 and the connecting body 65. Accordingly, the locking portion 91 comes into contact with the locking end portion 505a of the annular protrusion portion 505 and is locked by the locking end portion 505a (FIG. 5). In other words, the annular protrusion portion 505 locks the locking portion 91 at the tip (locking end portion 505a) protruding from the annular flat plate portion 504. The annular locking end portion 505a locks the locking portions 91 at each location in the circumferential direction. Therefore, the peripheral edge portion 503 is sandwiched by the outer peripheral lip 63 and the inner peripheral lip 64 of the water-stopping member 60A and the locking portions 91 of the base member 10X (base members 10, 10).

[0050] In this manner, when the grommet 1 of this embodiment is attached to the peripheral portion 503 of the through hole 502 of the insertion target object 501, the outer peripheral lip 63 abuts against the annular flat surface 503a of the peripheral portion 503 and elastically deforms, and the inner peripheral lip 64 abuts against the annular flat surface 503a of the peripheral portion 503 and elastically deforms the connecting body 65. Since the connecting body 65 bends toward the flange surface 20c, elastic deformation of the inner peripheral lip 64 caused by being crushed by the annular flat surface 503a of the peripheral portion 503 can be suppressed. Therefore, with the grommet 1 of this embodiment, it is possible to reduce the insertion force required to insert the grommet 1 into the through hole 502.

[0051] Incidentally, as described above, connector 65 is disposed at a distance from flange surface 20c in the assembly completion position so that it can be flexibly deformed when grommet 1 is attached to peripheral portion 503 of through hole 502 of object 501 to be inserted, but connector 65 may be brought into contact with flange surface 20c during attachment to peripheral portion 503, or may not be brought into contact with flange surface 20c during the process of attachment to peripheral portion 503. However, in this grommet 1, if connector 65 is brought into contact with flange surface 20c during attachment to peripheral portion 503, connector 65 stops flexing and thereafter, there is a possibility that inner lip 64 will be crushed by annular flat surface 503a of peripheral portion 503, and will be elastically deformed. In this case, in grommet 1, the insertion force for inserting connector 65 into through hole 502 is reduced until connector 65 abuts against flange surface 20c, and the insertion force increases after connector 65 contacts flange surface 20c. Therefore, in this grommet 1, it is desirable to configure connector 65 so that connector 65 does not come into contact with flange surface 20c during the process of attachment to peripheral portion 503, for example, by arranging connector 65 at a distance from flange surface 20c even in the attachment completion position. This allows grommet 1 to continue to reduce the insertion force for inserting connector 65 into through hole 502 until attachment to peripheral portion 503 is completed.

[0052] In addition, in the grommet 1 shown here, the outer peripheral lip 63 is coaxially protruded from the main body 61 toward the peripheral portion 503 so as to be pulled away from the axis of the through hole 502 as it approaches the peripheral portion 503. Therefore, the outer peripheral lip 63 does not undergo elastic deformation such as being crushed by the annular flat surface 503a of the peripheral portion 503, but rather undergoes bending deformation when pressed by the annular flat surface 503a. Therefore, in this grommet 1, it is possible to further reduce the insertion force required to insert the grommet 1 into the through hole 502. [Explanation of symbols]

[0053] 1 Grommet 10X Base material 20 Flange 20a Flange outer edge 20c Flange surface 30 Cylindrical body 30a Outer surface 60 Grommet body 60A Water-stopping material 60B Support member 61 Main unit 61b Inner periphery 63 Outer lip 64 Inner lip 65 Concatenation 91 Locking part 501 Insertion object 502 Through hole 503 Periphery 503a Circular Plane S1 One side of the space S2 The other space We wiring material

Claims

1. A base member made of a synthetic resin material, through which a conductive wiring material is inserted on the inside to be passed from one space to another space through a through hole of an object to be inserted; 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; Equipped with the base member has an annular flange having an annular flange surface that is disposed in the one space at the installation completion position and that is disposed coaxially opposite to an annular flat surface of the annular peripheral portion on the one space side with a gap therebetween, and a cylindrical body that protrudes coaxially from the flange toward the other space and is inserted into the through hole at the installation completion position, and has a plurality of engaging portions in a circumferential direction of the cylindrical body that protrude beyond an outer circumferential surface of the cylindrical body in the other space at the installation completion position and that contact the peripheral portion from the other space side in the other space at the installation completion position, The grommet body includes an annular water-stopping member made of an elastically deformable synthetic resin material that is softer than the base member, the water-stopping member has: an annular main body which is coaxially engaged with the flange surface at the assembly completion position with the base member; an annular outer peripheral lip which protrudes coaxially from an inner peripheral edge portion of the main body towards the peripheral edge portion and which elastically deforms and fits tightly against the annular flat surface of the peripheral edge portion over the entire circumference at the installation completion position; an annular inner peripheral lip which is coaxially arranged closer to the cylindrical body than the outer peripheral lip and which fits tightly against the annular flat surface of the peripheral edge portion over the entire circumference at the installation completion position; and a connector which is arranged with a gap from the flange surface at the assembly completion position, which connects a root of the inner peripheral lip to a root of the inner peripheral edge portion of the main body and / or the outer peripheral lip on the main body side, and which receives a force from the inner peripheral lip and is flexibly deformed towards the flange surface at the installation completion position, the connecting body is formed in an annular shape that is spaced apart from the flange surface and coaxial with the flange surface at the assembly completion position, The outer peripheral lip is coaxially protruded from the main body toward the peripheral edge portion so as to be separated from the axis of the through hole as it approaches the peripheral edge portion, The inner lip protrudes coaxially from the inner peripheral edge portion of the connecting body toward the peripheral edge portion, and is brought into close contact with the annular plane by receiving a resilient force accompanying the bending deformation of the connecting body.

2. A grommet as described in claim 1, characterized in that the connector is positioned at a distance from the flange surface even in the completed installation position.

3. A grommet as described in claim 1 or 2, characterized in that the inner lip has a wall surface on the outer lip side that is suspended from the connecting body.

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