Grommet

Abstract

The water stop member (60A) is provided with: an annular main body (61) that engages with the flange surface (20c) coaxially at a position where the water stop member (60A) is assembled with the base member (10X); an annular outer peripheral lip section (63) that protrudes coaxially from an inner peripheral edge section (61b) of the main body toward a peripheral edge section (503), and that is elastically deformed at an assembly completion position to be in close contact with an annular flat surface (503a) of the peripheral edge section over the entire circumference; an annular inner peripheral lip part (64) which is coaxially arranged closer to the cylindrical body (30) side than the outer peripheral lip part, and which is in close contact with the annular plane over the entire circumference at the assembly completion position; and a connecting body (65) which is disposed at a distance from the flange surface in the assembly completion position, connects the root of the inner peripheral lip to the inner peripheral edge of the main body or / and the root of the main body side of the outer peripheral lip, and is stressed from the inner peripheral lip in the assembly completion position to deflect and deform toward the flange surface side.

Description

Technical Field

[0001] The invention relates to a grommet. Background Art

[0002] In the past, in a wiring harness, wiring materials such as electric wires are inserted into a through-hole provided in an object to be inserted (for example, a panel of a vehicle body in a vehicle), thereby introducing the wiring materials from one space separated by the object to be inserted into another space. Therefore, in order to protect the wiring materials from the periphery of the through-hole and to prevent liquid from penetrating into the gap between the through-hole and the wiring materials, a grommet that blocks the gap is installed on the object to be inserted. For example, the grommet includes a base component made of a hard synthetic resin material and an annular water-stop component made of a flexible synthetic resin material such as rubber, and the grommet is inserted into the through-hole so that the water-stop component is in close contact with the periphery of the through-hole of the object to be inserted. For example, a grommet constructed in this way is disclosed in the following patent document 1.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 8-251769 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] However, in the past, in order to improve the water-stopping property between the water-stopping component and the periphery of the through hole, a ring-shaped lip is sometimes provided on the water-stopping component. The lip protrudes in the insertion direction of the grommet relative to the through hole, and when the grommet is assembled to the periphery of the through hole, the lip abuts against the periphery and adheres to it while bending. Therefore, in such a grommet, the lip becomes the main reason for increasing the insertion force into the through hole.

[0008] Therefore, an object of the present invention is to provide a grommet capable of reducing the insertion force.

[0009] Technical solutions to the problem

[0010] The grommet of the present invention is characterized in that it comprises: a base member, the base member is made of a synthetic resin material, and a conductive wiring material is inserted from one space to another space through a through hole of an insertion object; and an annular grommet body, the grommet body is assembled to the base member, and is arranged in the one space at an assembly completion position toward the peripheral portion of the through hole of the insertion object, the base member having: an annular flange, the flange being arranged in the one space at the assembly completion position, the flange having an annular flange A flange surface, the flange surface is coaxially arranged opposite to the annular plane on the one space side of the annular peripheral portion with a gap therebetween; and a cylindrical body, the cylindrical body protrudes from the flange coaxially toward the other space and is inserted into the through hole at the assembled position, and has a plurality of stoppers in the circumferential direction of the cylindrical body, the plurality of stoppers protrude more than the outer circumferential surface of the cylindrical body at the other space at the assembled position, and the stoppers are inserted from the other space at the assembled position. One space side is in contact with the peripheral portion, and the grommet body has an annular water-stopping component, and the water-stopping component is made of a synthetic resin material that is softer and elastically deformable than the base component, and the water-stopping component has: an annular main body, and the main body is coaxially clamped to the flange surface at the assembly completion position with the base component; an annular outer peripheral lip portion, and the outer peripheral lip portion protrudes coaxially from the inner peripheral edge portion of the main body toward the peripheral portion, and the annular lip portion is elastically deformed at the assembly completion position and is tightly attached to the peripheral portion throughout the entire circumference. plane; an annular inner lip portion, which is coaxially arranged on the side of the cylindrical body than the outer lip portion, and is in close contact with the annular plane of the peripheral portion throughout the entire circumference at the assembled position; and a connecting body, which is arranged at a distance from the flange surface at the assembled position, so that the root of the inner lip portion is connected to the inner peripheral portion of the main body or / and the root of the outer lip portion on the main body side, and is subjected to force from the inner lip portion at the assembled position to bend and deform toward the flange surface side.

[0011] Effects of the Invention

[0012] When the grommet of the present invention is mounted on the peripheral portion of a through hole through which an object is inserted, the outer peripheral lip abuts against the annular plane of the peripheral portion and elastically deforms, and the inner peripheral lip abuts against the annular plane of the peripheral portion and elastically deforms the connection body. In addition, since the connection body is bent toward the flange surface side, elastic deformation of the inner peripheral lip caused by being flattened by the annular plane of the peripheral portion can be suppressed. Therefore, in the grommet of the present invention, the insertion force for inserting into the through hole can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a perspective view showing the grommet of the embodiment before being assembled into an object to be inserted.

[0014] Figure 2 This is a perspective view of the grommet of the embodiment viewed from another angle.

[0015] Figure 3 This is a plan view of the grommet of the embodiment as viewed from the cylindrical body side.

[0016] Figure 4 is equivalent to Figure 3 The XX line cross-section diagram shows the assembly before the object is inserted.

[0017] Figure 5 is equivalent to Figure 3 The XX line cross-section diagram shows the assembly after the object is inserted through.

[0018] Figure 6 It is an exploded perspective view showing the grommet of the embodiment.

[0019] Figure 7 This is an exploded perspective view of the grommet of the embodiment viewed from another angle.

[0020] Figure 8 This is an exploded perspective view showing the grommet of the embodiment divided into two assembled base members and a grommet body.

[0021] Fig. 9 It is an exploded perspective view of the base member and the waterproof member of the embodiment.

[0022] Fig.10 It is an exploded perspective view of the grommet body of the embodiment. DETAILED DESCRIPTION

[0023] Hereinafter, an embodiment of the grommet according to the present invention will be described in detail based on the drawings. However, the present invention is not limited to the embodiment.

[0024] [Example]

[0025] based on Figures 1 to 10 One embodiment of the grommet according to the present invention will be described.

[0026] Figures 1 to 8 The reference numeral 1 in the figure indicates a grommet of the present embodiment. The grommet 1 protects the conductive wiring material We which is wired from one space S1 to another space S2 through the through hole 502 of the insertion object 501 from being affected by the peripheral edge 503 of the through hole 502 of the insertion object 501, and prevents liquid (water, etc.) from penetrating into the gap ( Figure 1 , Figure 4 as well as Figure 5 ). Therefore, the grommet 1 is attached to the peripheral edge portion 503 of the through hole 502 of the object 501 to be inserted after the wiring material We is inserted therethrough.

[0027] Here, the wiring material We refers to, for example, an electric wire (an electric wire used as a communication line, an electric wire used as a power line, etc.). In addition, the insertion object 501 is a component used to insert the wiring material We. For example, in the case of a vehicle, the insertion object 501 represents a wall such as a panel of the vehicle body. The wiring material We passes through the through hole 502 inserted in the insertion object 501, thereby routing between a space S1 and another space S2 separated by the insertion object 501. For example, the wiring material We is responsible for the communication between the devices in one space S1 and another space S2, or for supplying power to an electrical device in one space S1 from a power source in another space S2, etc.

[0028] The peripheral portion 503 of the through hole 502 through which the object 501 is inserted has an annular flat plate portion (hereinafter referred to as the "annular flat plate portion") 504 and an annular protrusion portion (hereinafter referred to as the "annular protrusion portion") 505 protruding from the inner peripheral end portion (inner peripheral edge portion 504a) of the annular flat plate portion 504 toward the other space S2. Figure 1 , Figure 4 as well as Figure 5 ). The grommet 1 is attached to the annular flat plate portion 504 and the annular protrusion 505 at the peripheral portion 503. For example, the insertion object 501 is formed by stamping, and the annular flat plate portion 504 and the through hole 502 are formed at this time. Moreover, in the insertion object 501, the annular protrusion 505 is formed by flanging the periphery of the through hole 502. Here, the through hole 502 is formed in a circular shape, so the annular flat plate portion 504 and the annular protrusion 505 are respectively formed in a circular ring shape.

[0029] The grommet 1 includes a base member 10X ( Figures 1 to 9 ). The base component 10X may be composed of a single component or may be assembled from a plurality of components. The base component 10X shown here includes two base components (a first base component and a second base component) assembled with each other. The two base components may be components of different shapes or identical components of the same shape. In the grommet 1 shown here, identical components of the same shape (base components 10, 10) are used in the two base components. Figures 1 to 9 ).

[0030] The base member 10X has at least an annular flange 20 and a cylindrical body 30 coaxially, and a wiring material We ( Figure 1 and Figures 3 to 9The base member 10X shown here has, in addition to the flange 20 and the cylindrical body 30, a tubular body 40 coaxial with the flange 20 and the cylindrical body 30, and a wiring material We is inserted through the flange 20, the cylindrical body 30 and the tubular body 40 ( Figure 1 , Figure 2 as well as Figures 4 to 9 Here, on the same axis, the cylindrical body 30 is made to protrude from the flange 20 toward one side, and the tubular body 40 is made to protrude from the flange 20 toward the other side.

[0031] In the base member 10X shown here, as described later, the annular flange 20, the cylindrical body 30 and the tubular body 40 are formed coaxially by the mutually assembled base members 10, 10. Therefore, a holding mechanism (hereinafter referred to as "base holding mechanism") 50 ( Figure 1 , Figure 2 as well as Figures 6 to 9 ).

[0032] The grommet 1 includes an annular grommet body 60 ( Figures 1 to 8 and Fig.10 In order to prevent liquid (water, etc.) from penetrating from one space S1 to another space S2 through the through hole 502, the grommet body 60 is arranged in one space S1 ( Figure 4 and Figure 5 ) In addition, when it is simply described as “assembly completion position” below, it means the assembly completion position of the grommet 1 relative to the peripheral edge portion 503.

[0033] 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.

[0034] The two base members 10, 10 are assembled by bringing their joint surfaces 10a together ( Figure 3 , Figure 6 , Figure 7 and Fig. 9 ). The two base members 10, 10 sandwich the wiring material We in their assembled state, so that the wiring material We is inserted. Here, by assembling the two base members 10, 10, the annular flange 20, the cylindrical tubular body 30 and the circular tubular tubular body 40 are formed. In addition, here, the straight tubular body 40 is taken as an example. However, the tubular body 40 may be bent after protruding from the flange 20.

[0035] The flange 20 is arranged in a space S1 in the assembled position, and is arranged coaxially opposite to the annular plane 503a on the space S1 side of the peripheral edge portion 503 with a gap therebetween ( Figure 5 ). The annular plane 503a is provided on the annular flat plate portion 504. The annular plane 503a shown here is the annular plane itself on the side of a space S1 in the annular flat plate portion 504. The flange 20 is arranged such that the annular outer peripheral edge portion (hereinafter referred to as "flange outer peripheral edge portion") 20a side is coaxially opposed to the annular plane 503a with a gap in the hole axis direction of the through hole 502 at the assembled position ( Figure 5 ). In addition, the flange 20 allows the wiring material We to be inserted to a position inside the annular inner peripheral edge portion (hereinafter referred to as "flange inner peripheral edge portion") 20b ( Figure 4 and Figure 5 ).

[0036] The flange 20 is formed in a plate shape. Therefore, an annular wall surface (hereinafter referred to as "flange surface") 20c (hereinafter referred to as "flange surface") is provided on the flange outer peripheral edge 20a side of the flange 20, which is arranged opposite to the annular plane 503a on the same axis with a gap in the assembled position. Figures 4 to 8 Here, the flange 20 is formed in a circular ring shape.

[0037] The two base members 10, 10 each have a split flange 11 ( Figures 1 to 8 ) The split flange 11 shown here is formed by dividing the flange 20 into two halves along the central axis, and is formed in a semicircular arc shape.

[0038] The cylindrical body 30 protrudes from the flange 20 toward the other space S2 on the same axis, and is inserted into the through hole 502 ( Figure 4 and Figure 5 That is, in the cylindrical body 30, the end in the direction protruding from the flange 20 is arranged in another space S2. The cylindrical body 30 is formed into a cylindrical shape. The cylindrical body 30 protrudes 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 ( Figure 4 and Figure 5 Here, for example, the flange 20 is divided into two parts in the radial direction, namely, the flange outer peripheral edge portion 20a side and the flange inner peripheral edge portion 20b side, and the cylindrical body 30 protrudes from the boundary portion between the flange outer peripheral edge portion 20a side and the flange inner peripheral edge portion 20b side.

[0039] The two base members 10, 10 each have a split tube 12 ( Figure 1 and Figures 3 to 8) The split tube 12 shown here is obtained by dividing the cylindrical body 30 into two halves along the central axis, and is formed into a semicircular arc shape.

[0040] The tubular body 40 protrudes from the flange 20 coaxially with the cylindrical body 30 in the opposite direction ( Figure 4 and Figure 5 The tubular body 40 is formed into a circular tube. The tubular body 40 shown here protrudes from the flange inner peripheral edge portion 20b of the flange 20, and the wiring material We ( Figure 4 and Figure 5 ).

[0041] The two base members 10, 10 each have a split tube 13 ( Figure 1 , Figure 2 as well as Figures 4 to 8 ) The split tube 13 shown here is a split tube obtained by splitting the tubular body 40 into two halves along the central axis, and is formed in a semicircular arc shape.

[0042] Here, the flange 20 of this example has: a first flange portion 21 in the form of an annular plate, which is formed by connecting the flange outer peripheral portion 20a and the flange inner peripheral portion 20b; and a second flange portion 22 in the form of an annular plate, which is arranged coaxially with a gap between the outer peripheral portion 21a side of the first flange portion 21 and the annular plane 503a of the peripheral portion 503 at the assembled position, respectively ( Figure 1 , Figure 2 as well as Figures 4 to 8 The outer peripheral edge 22a of the second flange portion 22 is arranged radially closer to the hole axis side of the through hole 502 than the outer peripheral edge 21a of the first flange portion 21, so that the outer diameter is smaller than that of the first flange portion 21 ( Figures 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. In addition, the inner peripheral edge portion 22b of the second flange portion 22 is connected to the outer peripheral surface 30a of the cylindrical body 30 ( Figures 4 to 6 and Figure 8 ). Therefore, the flange outer peripheral edge portion 20a side of the flange 20 of this example becomes a double-wall structure formed by the outer peripheral edge portion 21a side of the first flange portion 21 and the second flange portion 22, and the flange inner peripheral edge portion 20b side becomes a single-wall structure formed by the inner peripheral edge portion 21b side of the first flange portion 21 ( Figures 4 to 8). In the flange 20, the cylindrical body 30 is protruded from the boundary portion between the outer peripheral edge portion 21a and the inner peripheral edge portion 21b of the first flange portion 21, and the cylindrical body 30 is further protruded from the inner peripheral edge portion 22b of the second flange portion 22. In addition, in the flange 20, the wall surface on the annular plane 503a side of the peripheral edge portion 503 of the second flange portion 22 is formed as a flange surface 20c disposed opposite to the annular plane 503a on the same axis with a gap therebetween.

[0043] As described above, the main parts (dividing flange 11, dividing cylinder 12, dividing tube 13) of the two base components 10, 10 are high-hardness components that are difficult to elastically deform. Therefore, the two base components 10, 10, for example, may form a minute gap between each other's joining surfaces 10a due to the surface roughness of their joining surfaces 10a. Therefore, the grommet 1 of the present embodiment has a waterproof component 71 on at least one of the joining surfaces 10a of the two base components 10, 10. The waterproof component 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 base component 10, and eliminates the gap between each joining surface 10a ( Figure 3 , Figure 6 , Figure 7 as well as Fig. 9 ).

[0044] The waterproof member 71 is formed of, for example, a synthetic resin material such as an elastomer. The waterproof member 71 is provided, for example, over the joint surfaces 10a of the split flange 11, the split tube 12, and the split pipe 13. The base member 10 shown here has a groove 10b formed on one of the two joint surfaces 10a from the split flange 11 to the split pipe 13, and the waterproof member 71 ( Fig. 9 ). The waterproof component 71 protrudes from the groove 10b. For example, the waterproof component 71 is made by two-color molding with the base component 10, or is insert-molded relative to the base component 10 housed in the mold, so as to be integrally molded relative to the base component 10. In addition, the waterproof component 71 can also be molded as a component different from the base component 10 and affixed to the groove 10b of the base component 10 using an adhesive or the like. In the base component 10X, by assembling two base components 10, 10, the waterproof component 71 protruding from the groove 10b of one joint surface 10a of one base component 10 is closely attached to the other joint surface 10a of the other base component 10.

[0045] The base holding mechanism 50 is a holding mechanism for holding the two base members 10, 10 in a state where the respective joint surfaces 10a are closed. The base holding mechanism 50 is provided at multiple locations between the two base members 10, 10. For example, the base holding mechanism 50 shown here includes: a sheet 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 the wall surface of the sheet 51 ( Figure 6 and Figure 7 ). In addition, the base holding mechanism 50 shown here includes: an insertion port 53, which is provided on the joint surface 10a of the other of the two base components 10, 10, for inserting the sheet portion 51 and the first locking portion 52 of one of them; and a second locking portion 54, which is provided on the other of the two base components 10, 10, and is arranged opposite to the first locking portion 52 when the joint surfaces 10a of each other are closed, so that the two base components 10, 10 are maintained in a state where the respective joint surfaces 10a are closed ( Figure 6 and Figure 7 The second locking portion 54 has the following flexibility: it is pushed by the first locking portion 52 inserted from the insertion port 53 and is bent, and when the joint surfaces 10a are closed, the first locking portion 52 is separated and the bending is eliminated.

[0046] The two base members 10, 10 shown here each have a set of sheet portions 51 and a first stopper 52 at one end of the circumferential direction of the split tube 12, and a set of insertion ports 53 and a second stopper 54 at the other end of the circumferential direction of the split tube 12. In the two base members 10, 10, the first stopper 52 at one end of one split tube 12 is stopped with the second stopper 54 at the other end of the other split tube 12, and the second stopper 54 at the other end of one split tube 12 is stopped with the first stopper 52 at one end of the other split tube 12, while the respective joint surfaces 10a are closed. That is, in the two base members 10, 10, the base holding mechanism 50 for connecting and maintaining the connected state of the respective split tubes 12 is provided at two locations. Furthermore, the two base members 10, 10 are respectively provided with a set of sheet portions 51 and a first stopper 52 at one end of the circumferential direction of the split tube 13, and a set of insertion ports 53 and a second stopper 54 at the other end of the circumferential direction of the split tube 13. In the two base members 10, 10, the first stopper 52 at one end of one split tube 13 is stopped with the second stopper 54 at the other end of the other split tube 13, and the second stopper 54 at the other end of one split tube 13 is stopped with the first stopper 52 at one end of the other split tube 13, while the respective joint surfaces 10a are closed. That is, the base holding mechanism 50 for connecting the split tubes 13 and maintaining the connection state is provided at two locations in the two base members 10, 10.

[0047] The grommet body 60 comprises: an annular water stop member 60A, which is made of a soft resin (i.e., a synthetic resin material that is softer than the hard resin of the base member 10X (base member 10) and can be elastically deformed); and an annular supporting member 60B, which is made of a synthetic resin material that is harder than the soft resin of the water stop member 60A and is integrated with the water stop member 60A ( Figure 1 , Figure 2 , Figures 4 to 8 as well as Fig.10 The water stop member 60A is molded using, for example, a synthetic resin material such as an elastic body that is softer than the hard resin of the base member 10X (base member 10) and the support member 60B and can be elastically deformed. In addition, the support member 60B is made of, for example, the same hard resin as the base member 10X (base member 10) or a hard resin different from the hard resin and 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.

[0048] The grommet body 60 is configured as a molded product formed integrally of the water stop component 60A and the support component 60B. In the grommet body 60, the water stop component 60A is integrated with the support component 60B. For example, the water stop component 60A is made in a mold by two-color molding with the support component 60B, or insert molding is performed relative to the support component 60B accommodated in the mold, so as to be integrally molded relative to the support component 60B. In addition, the water stop component 60A can also be molded as a component different from the support component 60B, and attached to the support component 60B using an adhesive or the like.

[0049] The grommet main body 60 is assembled to the base member 10X (the base members 10 , 10 assembled to each other) via a support member 60B.

[0050] The water stop member 60A has an annular main body 61, which is coaxially engaged with the flange surface 20c ( Figure 1 , Figure 2 , Figures 4 to 8 and Fig.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 from the second flange portion 22 and is arranged opposite to the outer peripheral edge portion 21a of the first flange portion 21 with a gap therebetween ( Figure 4 and Figure 5 ). In addition, below, when simply described as “assembly completed position”, it means the assembly completed position of the base member 10X (the base members 10 and 10 assembled to each other) and the grommet body 60.

[0051] The water stop member 60A shown here has an annular lip portion (hereinafter referred to as "flange side lip portion") 62 which elastically deforms in its assembled position and is in close contact with the flange surface 20c over the entire circumference on the same axis. The main body 61 is locked to the flange surface 20c ( Figure 4 and Figure 5 Therefore, in the assembled position, the water stop member 60A has the main body 61 disposed coaxially with 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.

[0052] The water stop member 60A has an annular outer peripheral lip portion 63 that protrudes coaxially from the inner peripheral edge portion 61b of the main body 61 toward the peripheral edge portion 503 and elastically deforms in the assembled position to closely adhere to the annular plane 503a of the peripheral edge portion 503 over the entire circumference ( Figures 1 to 8 and Fig.10 The outer peripheral lip 63 protrudes from the main body 61 toward the peripheral portion 503 in a manner that the closer it is to the peripheral portion 503, the farther it is from the hole axis of the through hole 502. In the assembled position, it is deformed and closely adheres to the annular plane 503a of the peripheral portion 503 throughout the entire circumference ( Figure 4 as well as Figure 5 The radially inner wall surface 63a of the outer peripheral lip portion 63 has two annular auxiliary lip portions 63b ( Figure 4 and Figure 5 ). The outer peripheral lip portion 63 is bent and deformed from the root portion on the main body 61 side at the assembled position, so that the two auxiliary lip portions 63b are in close contact with the annular plane 503a of the peripheral edge portion 503.

[0053] The water stop member 60A has an annular inner lip portion 64 which is coaxially arranged closer to the cylindrical body 30 than the outer lip portion 63 and which is in close contact with the annular plane 503a of the peripheral edge portion 503 over the entire circumference in the assembled position ( Figure 1 , Figures 3 to 8 and Fig.10 ). In addition, the water stop member 60A has a connecting body 65 ( Figure 1 , Figures 3 to 8 and Fig.10 ). The connecting body 65 connects the root of the inner lip 64 to the inner peripheral edge 61b of the main body 61 and / or the root of the outer lip 63 on the main body 61 side, and is subjected to force from the inner lip 64 to bend and deform toward the flange surface 20c in the assembled position. The inner lip 64 is subjected to the elastic force generated by the bending deformation of the connecting body 65, and is closely attached to the annular plane 503a of the peripheral edge 503.

[0054] One or more connecting bodies 65 are provided in the water stop component 60A, and the inner peripheral edge portion 61b of the main body 61 and / or the root of the main body 61 side in the outer peripheral lip 63 are connected to the inner peripheral lip 64. The connecting body 65 shown here connects the inner peripheral lip 64 to the root of the main body 61 side of the outer peripheral lip 63. In addition, the connecting body 65 shown here is provided in one water stop component 60A, and is formed into a ring shape that is coaxially spaced relative to the flange surface 20c in the assembled position. The inner peripheral lip 64 protrudes coaxially toward the peripheral portion 503 from the inner peripheral edge portion of the connecting body 65. Here, the connecting body 65 is formed into a circular plate shape.

[0055] In the water stop member 60A, the plane of the main body 61 located on the flange surface 20c side, the flange side lip 62 and the plane of the connecting body 65 are formed by a mold (not shown) with one side in the axial direction of the water stop member 60A as the extraction direction. Therefore, in the water stop member 60A, the demolding property when the mold is extracted in the extraction direction after molding can be improved.

[0056] Here, as described above, the outer lip 63 protrudes from the main body 61 toward the peripheral portion 503 in a manner that the closer it is to the peripheral portion 503 on the same axis, the farther it is from the hole axis of the through hole 502, and two annular auxiliary lips 63b protrude coaxially from the inner wall surface 63a in the radial direction. Furthermore, as described above, the inner lip 64 protrudes coaxially from the inner peripheral portion of the connecting body 65 toward the peripheral portion 503. In the water stop component 60A, the radial inner side of the outer lip 63, the inner lip 64, and the plane on the peripheral portion 503 side of the connecting body 65 are formed by a mold (not shown) with the other side of the axial direction of the water stop component 60A as the extraction direction. Therefore, in the waterproof component 60A, by determining the outer peripheral lip 63 and the inner peripheral lip 64 to have the following shapes, when the mold is pulled out in its pulling-out direction after molding, the load applied to the outer peripheral lip 63 and the inner peripheral lip 64 from the mold is reduced.

[0057] In the outer peripheral lip 63, the inner wall surface 63a in the radial direction is inclined so as to be farther away from the axis of the water stop component 60A (the hole axis of the through hole 502) as it approaches the peripheral edge 503. In addition, the auxiliary lip 63b is formed into a triangular cross-sectional shape orthogonal to the circumferential direction, and the inner wall surface in the radial direction is set as a wall surface parallel to the axis of the water stop component 60A (the hole axis of the through hole 502), and the wall surface on the side of the peripheral edge 503 is set as a plane orthogonal to the axis of the water stop component 60A (the hole axis of the through hole 502). As a result, in the water stop component 60A, when the mold described above is pulled out in the pulling-out direction after molding, the load applied to the outer peripheral lip 63 from the mold can be reduced. Therefore, in the water stop component 60A, the quality reduction of the outer peripheral lip 63 during molding can be suppressed, and the water stopping property of the outer peripheral lip 63 can be ensured.

[0058] The inner lip 64 has its radially outer wall (outer lip 63 side) vertically arranged from the connecting body 65. Thus, in the water stop component 60A, when the aforementioned mold is pulled out in the pull-out direction after molding, the load applied from the mold to the radially outer side of the inner lip 64 can be reduced. In addition, the inner lip 64 has its radially inner wall inclined in such a manner that the closer it is to the peripheral portion 503, the farther it is from the axis of the water stop component 60A (the hole axis of the through hole 502). Thus, in the water stop component 60A, when the aforementioned mold is pulled out in the pull-out direction after molding, the load applied from the mold to the radially inner side of the inner lip 64 can be reduced. For the inner lip 64, by adopting such a shape, the load applied from the mold can be reduced when the aforementioned mold is pulled out in the pull-out direction after molding. Therefore, in the waterproof member 60A, it is possible to suppress the quality degradation of the inner peripheral lip portion 64 during molding, and ensure the waterproof performance of the inner peripheral lip portion 64 .

[0059] The support member 60B is formed as an annular member ( 61a ) which is integrated with the outer peripheral edge portion 61a of the main body 61 of the waterproof member 60A and protrudes coaxially from the outer peripheral edge portion 61a toward the flange outer peripheral edge portion 20a of the flange 20. Figures 4 to 8 and Fig.10 The support member 60B is formed into an annular shape. The support member 60B protrudes beyond the second flange portion 22 to a position covering the annular gap between the first flange portion 21 and the second flange portion 22 from the radially outer side.

[0060] An engaging mechanism 80 is provided between the base member 10X (the base members 10, 10 assembled to each other) and the support member 60B. The engaging mechanism 80 engages a first engaging portion 81 provided on the base member 10X (the base members 10, 10 assembled to each other) with a second engaging portion 82 provided on the support member 60B, thereby maintaining the base member 10X (the base members 10, 10 assembled to each other) and the grommet body 60 in the assembled position ( Figure 1 , Figure 2 and Figures 4 to 8 ). The first engaging portion 81 is formed as a claw-shaped protrusion that protrudes radially outward from the outer peripheral edge portion 22a of the second flange portion 22. In addition, the second engaging portion 82 is a through hole formed in the support member 60B, and the first engaging portion 81 is inserted into and engaged with the inner peripheral wall surface of the second engaging portion 82 in the assembled position. The engaging mechanism 80 is provided in plurality around the axis of the cylindrical shaft of the base member 10X (the mutually assembled base members 10, 10). Here, the engaging mechanism 80 is provided in four portions 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.

[0061] The grommet 1 configured as above includes a holding mechanism 90 that holds the base member 10X (the base members 10, 10 assembled to each other) and the grommet body 60 at the peripheral edge portion 503 ( Figure 1 and Figures 3 to 8 The retaining mechanism 90 shown here utilizes the elastic force generated by the elastic deformation of the outer lip 63, the inner lip 64 and the connecting body 65 of the water stop member 60A, and utilizes the outer lip 63, the inner lip 64 and the following locking portion 91 provided on the base member 10X (base member 10) to clamp the peripheral portion 503 so that the grommet 1 is retained on the peripheral portion 503.

[0062] 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 assembly completion position and contacts the peripheral edge portion 503 from the other space S2 side in the other space S2 at the assembly completion position ( Figure 1 and Figures 4 to 8 ). The locking portion 91 locks a portion of the peripheral edge portion 503 in the circumferential direction. Therefore, the base member 10X has a plurality of the locking portions 91 in the circumferential direction of the cylindrical body 30.

[0063] In addition, the base member 10X has a cantilevered locking piece 92 for each locking portion 91, and the locking piece 92 is provided with the locking portion 91 ( Figure 1 as well as Figures 3 to 8 ). The locking piece 92 has a free end in the direction of protruding from the fixed end on the outer peripheral surface 30a side of the cylindrical body 30 to the side of one space S1 in another space S2 at the assembly completion position, so that the free end side protrudes from the outer peripheral surface 30a of the cylindrical body 30 (initial shape). In addition, the locking piece 92 is formed to have flexibility that can bend and deform to change the amount of protrusion of the free end side from the outer peripheral surface 30a. The locking piece 92 moves in the cutout portion 30b formed by cutting off a part of the cylindrical body 30 due to its flexural deformation ( Figure 1 and Figures 3 to 8 ). A plurality of combinations of the stopper 91, the stopper piece 92, and the cutout 30b are arranged at equal intervals in the circumferential direction relative to the cylindrical body 30. In the cylindrical body 30 shown here, four combinations of the stopper 91, the stopper piece 92, and the cutout 30b are arranged at equal intervals in the circumferential direction. Here, two combinations of the stopper 91, the stopper piece 92, and the cutout 30b are arranged in each of the split cylinders 12 of the base member 10.

[0064] When the cylindrical body 30 is inserted into the through hole 502 from a space S1, the locking piece 92 is subjected to force from the annular protrusion 505 of the peripheral portion 503 and is bent and deformed from the initial shape toward the cutout portion 30b side, leaving the position of the annular protrusion 505 and advancing to the end (hereinafter referred to as "locking end") 505a of the annular protrusion 505. Figure 1 , Figure 4 as well as Figure 5 ), and begins to return to the initial shape due to the disappearance of the force received from the annular protrusion 505. Therefore, the locking piece 92 is arranged together with the locking portion 91 in front of the locking end 505a of the annular protrusion 505. On the other hand, in the water stop component 60A, when a series of actions of the locking portion 91 and the locking piece 92 are generated, the outer peripheral lip 63 abuts against the annular plane 503a of the peripheral portion 503 and elastically deforms, and the inner peripheral lip 64 abuts against the annular plane 503a of the peripheral portion 503 to elastically deform the connecting body 65. Therefore, when the force (so-called insertion force) for inserting the grommet 1 into the through hole 502 is released, it returns to the side of a space S1 due to the elastic force generated by the elastic deformation of the outer peripheral lip 63 and the connecting body 65. Along with this, the locking portion 91 comes into contact with the locking end portion 505a of the annular protrusion 505 and is locked by the locking end portion 505a ( Figure 5 ). That is, the annular protrusion 505 locks the locking portion 91 with the end (locking end portion 505a) protruding from the annular flat plate portion 504. In the annular locking end portion 505a, the locking portion 91 is locked at various locations in the circumferential direction. Therefore, the peripheral portion 503 is clamped by the outer peripheral lip portion 63 and the inner peripheral lip portion 64 of the water stop member 60A and the locking portions 91 of the base member 10X (base members 10, 10).

[0065] Thus, when the grommet 1 of the present embodiment is mounted on the peripheral portion 503 of the through hole 502 of the object 501 to be inserted, the outer peripheral lip portion 63 abuts against the annular plane 503a of the peripheral portion 503 to elastically deform, and the inner peripheral lip portion 64 abuts against the annular plane 503a of the peripheral portion 503 to elastically deform the connecting body 65. In addition, since the connecting body 65 is bent toward the flange surface 20c side, it is possible to suppress the elastic deformation of the inner peripheral lip portion 64 caused by being flattened by the annular plane 503a of the peripheral portion 503. Therefore, in the grommet 1 of the present embodiment, the insertion force for inserting into the through hole 502 can be reduced.

[0066] However, in order to bend and deform the grommet 1 when it is mounted on the peripheral portion 503 of the through hole 502 of the object 501, the connecting body 65 is arranged at a distance from the flange surface 20c in the assembled position as described above, but it may also abut against the flange surface 20c during the process of mounting on the peripheral portion 503, or it may not contact the flange surface 20c during the process of mounting on the peripheral portion 503. However, in the grommet 1, when the connecting body 65 abuts against the flange surface 20c during the process of mounting on the peripheral portion 503, the bending deformation of the connecting body 65 stops, and thereafter, the inner peripheral lip portion 64 may be elastically deformed by being flattened by the annular plane 503a of the peripheral portion 503. In this case, the insertion force required for inserting the grommet 1 into the through hole 502 until the connecting body 65 abuts against the flange surface 20c is reduced, and the insertion force increases after the connecting body 65 contacts the flange surface 20c. Therefore, in the grommet 1, for example, the connection body 65 is arranged at a distance from the flange surface 20c even in the assembly completion position, so that the connection body 65 does not contact the flange surface 20c during the process of mounting to the peripheral edge portion 503. Thus, the insertion force for inserting the grommet 1 into the through hole 502 can be continuously reduced until the grommet 1 is mounted to the peripheral edge portion 503.

[0067] In the grommet 1 shown here, the outer peripheral lip 63 is made to protrude from the main body 61 toward the peripheral portion 503 so that the closer it is to the peripheral portion 503 on the same axis, the farther it is from the hole axis of the through hole 502. Therefore, the outer peripheral lip 63 does not undergo elastic deformation such as being flattened by the annular flat surface 503a of the peripheral portion 503, but does not undergo flexural deformation such as being pressed by the annular flat surface 503a. Therefore, in the grommet 1, the insertion force for inserting into the through hole 502 can be further reduced.

[0068] Description of Reference Numerals

[0069] 1 Grommet

[0070] 10X Base Parts

[0071] 20 Flange

[0072] 20a Flange outer peripheral portion

[0073] 20c Flange surface

[0074] 30 cylinder

[0075] 30a Outer surface

[0076] 60 Grommet Body

[0077] 60A Waterstop

[0078] 60B Supporting parts

[0079] 61 Main Body

[0080] 61b Inner peripheral part

[0081] 63 Peripheral lip

[0082] 64 Inner lip

[0083] 65 Connected Body

[0084] 91 stopper

[0085] 501 Insertion object

[0086] 502 Through hole

[0087] 503 Peripheral

[0088] 503a Annular plane

[0089] S1 One Space

[0090] S2 Another Space

[0091] We Wiring Materials

Claims

1. A grommet, characterized in that: have: a base member made of a synthetic resin material, wherein a conductive wiring material is inserted inside the base member so as to pass through a through hole of the object to be inserted from one space to another space; and an annular grommet body, the grommet body being assembled to the base member and arranged in the one space at a position where the grommet is assembled to the peripheral edge of the through hole of the object to be inserted, The base member has an annular flange, the flange is arranged in the one space at the assembly completion position, the flange has an annular flange surface, and the flange surface is coaxially arranged opposite to the annular plane of the annular peripheral portion on the one space side with a gap therebetween; and a cylindrical body, the cylindrical body protruding from the flange toward the other space on the same axis and inserted into the through hole at the assembly completion position, and having a plurality of stopper portions in the circumferential direction of the cylindrical body, the plurality of stopper portions protruding more than the outer peripheral surface of the cylindrical body in the other space at the assembly completion position, and the stopper portions contact the peripheral edge portion from the other space side in the other space at the assembly completion position, The grommet body includes an annular water stop member made of a synthetic resin material that is softer than the base member and can be elastically deformed, and The water stop component comprises: an annular main body, the main body being coaxially locked to the flange surface at the assembly completion position with the base component; an annular outer peripheral lip portion, the outer peripheral lip portion coaxially protruding from the inner peripheral edge portion of the main body toward the peripheral edge portion, and elastically deforming at the assembly completion position to be closely attached to the annular plane of the peripheral edge portion over the entire circumference; an annular inner peripheral lip portion, the inner peripheral lip portion being coaxially arranged at a position closer to the cylindrical body than the outer peripheral lip portion, and closely attached to the annular plane of the peripheral edge portion over the entire circumference at the assembly completion position; And a connecting body, which is arranged at a distance from the flange surface at the assembly completion position, so that the root of the inner peripheral lip is connected to the inner peripheral edge of the main body and / or the root of the main body side of the outer peripheral lip, and at the assembly completion position, it receives force from the inner peripheral lip and bends and deforms toward the flange surface side.

2. The grommet according to claim 1, characterized in that The connecting body is formed into a ring shape and is coaxially arranged with a distance from the flange surface at the assembly completion position, and The inner peripheral lip portion protrudes coaxially from the inner peripheral edge portion of the connection body toward the peripheral edge portion.

3. The grommet according to claim 1 or 2, characterized in that: The connection body is arranged at a distance from the flange surface even in the assembly completion position.

4. The grommet according to claim 1 or 2, characterized in that: The outer peripheral lip portion protrudes from the main body toward the peripheral edge portion so as to be coaxially spaced away from the hole axis of the through hole as it approaches the peripheral edge portion.

5. The grommet according to claim 1 or 2, characterized in that: The outer peripheral lip portion protrudes from the main body toward the peripheral portion in a manner that the closer it is to the peripheral portion, the farther it is from the hole axis of the through hole on the same axis. The inner peripheral lip portion is provided such that a wall surface on the outer peripheral lip portion side is perpendicular to the connection body.

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