Grommet

Abstract

The water stop member (60A) has: an annular main body (61) that coaxially abuts against an annular wall surface (20c) on the peripheral edge (503) side of the through-hole (502) in the flange (20) of the base member (10X); an annular outer peripheral lip (62) that coaxially protrudes from the main body (61) toward the peripheral edge section (503) so as to be farther away from the hole axis of the through hole (502) as the outer peripheral lip approaches the peripheral edge section (503), and that is brought into close contact with an annular flat surface (503a) of the peripheral edge section (503) over the entire circumference by flexural deformation at a mounting completion position; and an annular inner peripheral lip (63) that coaxially protrudes toward the peripheral edge section (503) from the inner peripheral edge section (61b) side of the main body (61) from the outer peripheral lip (62) so as to approach the hole axis of the through hole (502) as the inner peripheral edge section (61b) approaches the peripheral edge section (503), and that is in close contact with the annular plane (503a) side of the peripheral edge section (503) over the entire circumference by flexural deformation at the mounting completion position.

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, etc.), thereby introducing the wiring materials from one space separated by the object to be inserted into another space. Therefore, in order to prevent the wiring materials from being damaged by 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 is composed of a base member and an annular water-stop member, the base member is composed of a hard synthetic resin material, the water-stop member is composed of a synthetic resin material having flexibility such as rubber, and the grommet is inserted into the through hole so that the water-stop member is in close contact with the periphery of the through hole in 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 Publication 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 into the through hole, and when the grommet is assembled to the periphery of the through hole, it abuts against the periphery and adheres to the periphery while bending. Therefore, in such a grommet, the lip becomes the main reason for the increase in 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 present invention is characterized in that it comprises: a base component, which is composed of a synthetic resin material and allows a conductive wiring material that is laid from one space to another space through a through hole of an insertion object to be inserted therein; and an annular grommet body, which is assembled on the base component and is arranged in the one space at a completed installation position of the peripheral edge of the through hole of the insertion object, and the base component has: an annular flange, which is arranged in the one space at the completed installation position and is coaxially arranged opposite to an annular plane on the one space side of the annular peripheral edge with a gap therebetween; and a cylindrical body, which protrudes from the flange coaxially toward the other space and is inserted into the through hole at the completed installation position, and has a plurality of locking portions in the circumferential direction of the cylindrical body, the locking portions protruding from the outer peripheral surface of the cylindrical body at the other space at the completed installation position and The other space at the installation completion position contacts the peripheral portion from the other space side, and the grommet main body has an annular water-stop component, which is made of a synthetic resin material that is softer than the base component and can be elastically deformed, and the water-stop component has: an annular main body, which abuts coaxially with the annular wall surface on the peripheral portion side of the flange; an annular outer peripheral lip, which protrudes toward the peripheral portion from the main body on the coaxial line in a manner that the closer it approaches to the peripheral portion, the farther it moves away from the hole axis of the through hole, and is flexed and deformed at the installation completion position to be tightly attached to the annular plane of the peripheral portion throughout the entire circumference; and an annular inner peripheral lip, which protrudes toward the peripheral portion from the inner peripheral portion side of the main body than the outer peripheral lip on the coaxial line in a manner that the closer it approaches to the peripheral portion, the closer it approaches to the hole axis of the through hole, and is flexed and deformed at the installation completion position to be tightly attached to the annular plane side of the peripheral portion throughout the entire circumference.

[0011] Effects of the Invention

[0012] In the grommet of the present invention, when the cylindrical body is inserted into the through hole from a space, the outer lip and the inner lip start to bend and deform without being caught on the peripheral portion. Therefore, the grommet of the present invention can reduce the insertion force into the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 This is a plan view of the grommet according to the embodiment after being attached to the insertion object as viewed from the cylindrical body side.

[0015] Figure 3This is a plan view of the grommet according to the embodiment after being attached to an object to be inserted, as seen from the tubular body side.

[0016] Figure 4 Yes means Figure 2 Diagram of the XX line cross section.

[0017] Figure 5 This is a perspective view of the grommet according to the embodiment before being attached to the object to be inserted, as seen from another angle.

[0018] Figure 6 is equivalent to Figure 2 The XX line cross-sectional view shows the state before being installed on the insertion object.

[0019] Figure 7 It is an exploded perspective view showing the grommet according to the embodiment.

[0020] Figure 8 This is an exploded perspective view of the grommet according to the embodiment as viewed from another angle.

[0021] Fig. 9 This is an exploded perspective view showing the grommet according to the embodiment, with two assembled base members and a grommet body separated from each other.

[0022] Fig.10 It is an exploded perspective view of the base component and waterproof component.

[0023] Fig.11 It is an exploded perspective view of the grommet body. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of the grommet of the present invention will be described in detail based on the drawings. In addition, the present invention is not limited to this embodiment.

[0025] [Implementation Method]

[0026] based on Figures 1 to 11 One embodiment of the grommet of the present invention will be described.

[0027] Figures 1 to 9 The reference numeral 1 of the figure indicates a grommet of the present embodiment. The grommet 1 protects the conductive wiring material We that is extended 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 in the insertion object 501, and prevents liquid (water, etc.) from penetrating into the gap ( Figures 1 to 6 ). 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.

[0028] 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 for inserting the wiring material We, and in the case of a vehicle, for example, it represents a wall such as a panel of the vehicle body. The wiring material We is inserted into the through hole 502 of the insertion object 501, thereby wiring 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.

[0029] 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 edge end (inner peripheral edge portion 504a) of the annular flat plate portion 504 toward the other space S2. Figures 1 to 6 ). 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. Therefore, in the peripheral portion 503, a bent portion 506 ( Figure 4 and Figure 6 Here, the through hole 502 is formed in a circular shape, and therefore the annular flat plate portion 504 and the annular protrusion portion 505 are each formed in an annular shape.

[0030] The grommet 1 includes a base member 10X ( Figures 1 to 10 ). 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 the same components of the same shape. In the grommet 1 shown here, the two base components use the same components of the same shape (base components 10, 10) ( Figures 1 to 10 ).

[0031] The base member 10X has at least an annular flange 20 and a cylindrical body 30 coaxially, and a wiring material We ( Figures 1 to 9). In the base member 10X shown here, in addition to the flange 20 and the cylindrical body 30, there is also a tubular body 40 coaxially therewith, and a wiring material We ( Figure 1 and Figures 3 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.

[0032] 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 base members 10, 10 assembled with each other. Therefore, a holding mechanism (hereinafter referred to as "base holding mechanism") 50 ( Figure 1 , Figure 3 , Figure 5 as well as Figures 7 to 9 ).

[0033] The grommet 1 includes an annular grommet body 60 ( Figure 1 , Figures 3 to 9 and Fig.11 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 ) In addition, below, when it is simply described as “installation completion position”, it means the installation completion position of the grommet 1 relative to the peripheral edge portion 503.

[0034] 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.

[0035] The two base members 10, 10 are assembled with their joint surfaces 10a aligned with each other ( Figure 2 , Figure 3 , Figure 7 and Figure 8 ). The two base members 10, 10 sandwich the wiring material We in their assembled state, and are in a state where the wiring material We is inserted. Here, by assembling the two base members 10, 10, an annular flange 20, a cylindrical tubular body 30, and a circular tubular tubular body 40 are formed. In addition, here, a straight tubular body 40 is taken as an example. However, the tubular body 40 may also be a shape protruding from the flange 20 and then bent.

[0036] The flange 20 is arranged in a space S1 in the installed 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 4 ). 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 space S1 side of the annular flat plate portion 504. The flange 20 is formed in the shape of an annular plate. For example, the flange 20 is formed in a shape similar to the annular annular plane 503a. The flange 20 shown here has its annular outer peripheral edge portion 20a arranged opposite to the annular plane 503a, so that the wiring material We is inserted at a position closer to the inside than the annular inner peripheral edge portion 20b ( Figure 4 The outer peripheral edge portion 20a is coaxially disposed opposite to the inner peripheral edge portion 504a of the annular flat plate portion 504 in the annular plane 503a, with a gap therebetween along the hole axis direction of the through hole 502 in a space S1 ( Figure 4 ).

[0037] The two base members 10, 10 each have a split flange 11 ( Figures 1 to 9 ) 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 in a coaxial manner and is inserted into the through hole 502 ( Figure 4 and Figure 6 ). That is, in the cylindrical body 30, the top 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. For example, the orthogonal cross section of the cylindrical body 30 perpendicular to the hole axis of the through hole 502 is formed into a shape similar to the orthogonal cross section of the annular protrusion 505 perpendicular to the hole axis. The cylindrical body 30 shown here protrudes from the flange 20 at a position closer to the inner peripheral edge 20b than the outer peripheral edge 20a, and the wiring material We is inserted into the inside thereof ( Figure 4 and Figure 6 ).

[0039] The two base members 10, 10 each have a split tube 12 ( Figure 2 and Figures 4 to 9 ). 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 ( Figures 4 to 6). The tubular body 40 is formed into a circular tube shape. For example, the orthogonal cross section of the tubular body 40 perpendicular to the hole axis of the through hole 502 is formed into a shape similar to the orthogonal cross section of the annular protrusion 505 perpendicular to the hole axis. The tubular body 40 shown here protrudes from the inner peripheral edge 20b of the flange 20, and the wiring material We ( Figure 4 and Figure 6 ).

[0041] The two base members 10, 10 respectively have split tubes 13 ( Figure 1 and Figures 3 to 9 ) 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] 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 not easily elastically deformed. Therefore, the two base components 10, 10, for example, may form a minute gap between their respective 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 than the hard resin of the base component 10 and can be elastically deformed, and eliminates the gap between each joining surface 10a ( Figure 7 , Figure 8 as well as Fig.10 ).

[0043] The waterproof member 71 is formed of 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 is embedded in the groove 10b ( Fig.10 ). 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 formed relative to the base component 10. In addition, the waterproof component 71 can also be formed 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.

[0044] 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 aligned. 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 ( Figure 7 and Figure 8 ). Moreover, the base holding mechanism 50 shown here comprises: an insertion port 53, which is provided on the joint surface 10a of the other of the two base components 10, 10, and for inserting the sheet portion 51 and the first locking portion 52 of one of them; a flexible portion 54, which is provided on the other of the two base components 10, 10, and is pushed by the first locking portion 52 inserted from the insertion port 53 to bend, and when the joint surfaces 10a of each other are aligned, the first locking portion 52 is separated to eliminate the bending; and a second locking portion 55, 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 aligned, and keeps the two base components 10, 10 in a state where their respective joint surfaces 10a are aligned ( Figure 7 as well as Figure 8 ).

[0045] The two base members 10, 10 shown here each include a set of sheet portions 51 and a first locking portion 52 at one end of the split tube 12 in the circumferential direction, and include a set of insertion ports 53, a flexible portion 54, and a second locking portion 55 at the other end of the split tube 12 in the circumferential direction. In the two base members 10, 10, the first locking portion 52 at one end of one split tube 12 is locked with the second locking portion 55 at the other end of the other split tube 12, and the second locking portion 55 at the other end of one split tube 12 is locked with the first locking portion 52 at one end of the other split tube 12, while the respective joint surfaces 10a are aligned. That is, the base holding mechanism 50 for connecting and maintaining the connected state of the respective split tubes 12 is provided at two locations in the two base members 10, 10. Furthermore, the two base members 10, 10 are respectively provided with a set of sheet portions 51 and a first locking portion 52 at one end of the split tube 13 in the circumferential direction, and a set of insertion ports 53, a flexible portion 54, and a second locking portion 55 at the other end of the split tube 13 in the circumferential direction. In the two base members 10, 10, the first locking portion 52 at one end of one split tube 13 is locked with the second locking portion 55 at the other end of the other split tube 13, and the second locking portion 55 at the other end of one split tube 13 is locked with the first locking portion 52 at one end of the other split tube 13, while the respective joint surfaces 10a are aligned. That is, the base holding mechanism 50 for connecting the split tubes 13 and maintaining the connected state is provided at two locations in the two base members 10, 10.

[0046] 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 , Figures 3 to 8 and Fig.11 The water stop member 60A is formed of, 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 formed 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 formed of a synthetic resin material such as plastic.

[0047] The water stop member 60A has an annular main body 61 ( Figure 1 , Figure 4 , Figures 6 to 8 and Fig.11The main body 61 is formed in a circular plate shape. The main body 61 shown here is in a state where its outer peripheral edge portion 61a protrudes from the outer peripheral edge portion 20a of the flange 20, and abuts against the wall surface 20c of the outer peripheral edge portion 20a of the flange 20 ( Figure 4 and Figure 6 ).

[0048] The water stop member 60A includes: an annular outer peripheral lip 62, which protrudes from the main body 61 toward the peripheral portion 503 on the same axis in a manner that the closer it is to the peripheral portion 503, the farther it is away from the hole axis of the through hole 502, and is flexed and deformed at the installation completion position to be closely attached to the annular plane 503a of the peripheral portion 503 throughout the entire circumference; and an annular inner peripheral lip 63, which protrudes from the main body 61 on the inner peripheral portion 61b side than the outer peripheral lip 62 on the same axis toward the peripheral portion 503 in a manner that the closer it is to the peripheral portion 503, the closer it is to the hole axis of the through hole 502, and is flexed and deformed at the installation completion position to be closely attached to the annular plane 503a side of the peripheral portion 503 throughout the entire circumference ( Figure 1 , Figures 3 to 9 and Fig.11 ).

[0049] The outer peripheral lip 62 has two annular auxiliary lip portions 62b (62a) coaxially protruding from the wall surface 62a on the inner side in the radial direction. Figure 4 as well as Figure 6 ). The outer peripheral lip 62 is bent and deformed from the root of the main body 61 side at the installation completion position, so that the two auxiliary lip portions 62b are in close contact with the annular plane 503a of the peripheral edge portion 503.

[0050] In addition, the inner peripheral lip 63 is arranged so that the outer wall surface 63a of the inner peripheral lip 63 is in close contact with the annular flat surface 503a of the peripheral edge portion 503 in the radial direction at the installation completion position ( Figure 4 The inner peripheral lip 63 has a thin-walled portion 63b ( Figure 4 and Figure 6 ). The inner peripheral lip 63 has a thin-walled portion 63b whose wall thickness at the end side is thinner than that at the root of the main body 61 side, so that the thin-walled portion 63b is flexed and deformed at the installation completion position, and the radially outer wall surface 63a of the thin-walled portion 63b is in close contact with the annular plane 503a side of the peripheral portion 503. The inner peripheral lip 63 shown here can make the wall surface 63a of the thin-walled portion 63b in close contact with the arc surface 506a of the curved portion 506 of the peripheral portion 503 throughout the entire circumference, or can make the wall surface 63a of the thin-walled portion 63b in close contact with the annular plane 503a of the peripheral portion 503 throughout the entire circumference.

[0051] In the grommet body 60, the water stop member 60A is integrated with the support member 60B. For example, the water stop member 60A is formed by two-color molding with the support member 60B, or insert molding is performed with respect to the support member 60B accommodated in the mold, so as to be integrally formed with respect to the support member 60B. In addition, the water stop member 60A can also be formed as a component different from the support member 60B and attached to the support member 60B using an adhesive or the like.

[0052] The support member 60B includes an annular portion (hereinafter referred to as a "first annular portion") 65a (hereinafter referred to as a "first annular portion") coaxially disposed opposite to an annular contact surface 61c in contact with the wall surface 20c of the flange 20 in the main body 61 of the waterproof member 60A with a gap therebetween. Figure 1 , Figure 3 , Figure 4 , Figures 6 to 8 and Fig.11 ). The first annular portion 65a is formed into a circular plate shape. The base member 10X (the base members 10, 10 that have been assembled to each other) allows the outer peripheral edge portion 20a of the flange 20 to be embedded in the annular gap between the abutment surface 61c of the main body 61 and the first annular portion 65a. Thus, the grommet main body 60 is assembled in a manner that is integrated with the outer peripheral edge portion 20a of the flange 20.

[0053] The support member 60B has an annular portion (hereinafter referred to as a "second annular portion") 65b that coaxially projects from the outer peripheral edge of the first annular portion 65a toward the outer peripheral edge 61a of the main body 61 of the water stop member 60A and abuts against the outer peripheral edge 61a over the entire circumference ( Figure 1 , Figures 3 to 8 and Fig.11 ) The second annular portion 65b is formed in a cylindrical shape of an annular ring.

[0054] The water stop member 60A is integrated with the outer peripheral edge of the first annular portion 65a and the inner wall of the second annular portion 65b in a close contact state, and the outer peripheral edge 61a of the main body 61 and the contact surface of the second annular portion 65b that contacts the outer peripheral edge 61a are integrated in a close contact state. The water stop member 60A has an annular portion 64, which is integrated with the outer peripheral edge of the first annular portion 65a and the inner wall of the second annular portion 65b in a close contact state ( Figure 4 , Figure 6 and Fig.11). The annular portion 64 is formed into a cylindrical shape and protrudes coaxially from the main body 61 in a direction opposite to the outer peripheral lip 62 and the inner peripheral lip 63. For example, in the water stop member 60A, the annular portion 64 is integrally formed in a state of being closely attached to the outer peripheral edge portion of the first annular portion 65a and the inner wall surfaces of the second annular portion 65b, and the main body 61 is integrally formed in a state of making the outer peripheral edge portion 61a closely attached to the abutting surface of the second annular portion 65b that abuts against the outer peripheral edge portion 61a.

[0055] Strictly speaking, the outer peripheral edge portion 20a of the flange 20 is embedded in the annular gap between the abutting surface 61c of the main body 61 of the water stop member 60A and the first annular portion 65a of the support member 60B on the inner side of the annular portion 64 of the water stop member 60A. For example, an annular lip portion is formed on the inner peripheral surface of the annular portion 64, which is in close contact with the outer peripheral surface of the outer peripheral edge portion 20a of the flange 20 over the entire circumference, but this will not be described in detail. Thus, the grommet body 60 ensures waterproofness in the gap between the waterproof member 60A and the support member 60B.

[0056] The grommet 1 thus configured includes a holding mechanism 80 that holds the mutually assembled base member 10X (the mutually assembled base members 10, 10) and the grommet body 60 at the peripheral edge portion 503 ( Figure 2 and Figures 4 to 9 ). The retaining mechanism 80 shown here is a mechanism that utilizes the elastic force generated by the elastic deformation of the outer lip 62 and the inner lip 63 of the water stop member 60A, and utilizes the outer lip 62 and the inner lip 63 and the following locking portion 81 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.

[0057] The base member 10X has a locking portion 81 that protrudes from the outer peripheral surface 30a of the cylindrical body 30 in the other space S2 at the installation completion position and contacts the peripheral edge portion 503 from the other space S2 side in the other space S2 at the installation completion position ( Figures 4 to 9 ). The locking portion 81 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 81 in the circumferential direction of the cylindrical body 30.

[0058] In addition, the base member 10X has a cantilevered locking piece 82 for each locking portion 81, and the locking piece 82 is provided with the locking portion 81 ( Figure 2 as well as Figures 4 to 9). The locking piece 82 has a terminal end protruding from the fixed end on the outer peripheral surface 30a side of the cylindrical body 30 to the one space S1 side as a free end in another space S2 at the installation 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 82 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 82 moves in the cutout portion 30b formed by cutting off a part of the cylindrical body 30 due to its flexural deformation ( Figure 2 and Figures 4 to 9 ). A plurality of sets of the combination of the locking portion 81, the locking piece portion 82 and the cutout portion 30b are arranged at equal intervals in the circumferential direction relative to the cylindrical body 30. In the cylindrical body 30 shown here, four sets of the combination of the locking portion 81, the locking piece portion 82 and the cutout portion 30b are arranged at equal intervals in the circumferential direction. Here, two sets of the combination of the locking portion 81, the locking piece portion 82 and the cutout portion 30b are arranged in each of the split cylinders 12 of each base member 10.

[0059] When the cylindrical body 30 is inserted from a space S1 into the through hole 502, the locking piece 82 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. Figures 4 to 6 ), and begins to return to its original shape due to the disappearance of the force received from the annular protrusion 505. Therefore, the locking piece 82 is arranged together with the locking portion 81 in front of the locking end 505a of the annular protrusion 505. On the other hand, when the locking portion 81 and the locking piece 82 produce a series of movements, the outer lip 62 and the inner lip 63 of the water stop component 60A abut against the annular plane 503a side of the peripheral portion 503 and bend and deform. Therefore, when the force used to insert the grommet 1 into the through hole 502 is reduced (the so-called insertion force), the grommet 1 returns to a space S1 side by the elastic force generated by the elastic deformation of the outer lip 62 and the inner lip 63. Along with this, the locking portion 81 contacts the locking end 505a of the annular protrusion 505 and is locked by the locking end 505a ( Figure 4 ). That is, the annular protrusion 505 locks the locking portion 81 with the end (locking end 505a) in the direction of protruding from the annular flat plate portion 504. In the annular locking end 505a, the locking portion 81 is locked at each position in the circumferential direction. Therefore, the peripheral portion 503 is clamped by the outer peripheral lip 62 and the inner peripheral lip 63 of the water stop member 60A and the respective locking portions 81 of the base member 10X (base member 10, 10).

[0060] Here, in the grommet 1 of the present embodiment, as described above, the outer peripheral lip 62 is made to protrude toward the peripheral portion 503 so as to be farther away from the hole axis of the through hole 502 as it approaches the peripheral portion 503, and the inner peripheral lip 63 is made to protrude toward the peripheral portion 503 so as to be closer to the hole axis of the through hole 502 as it approaches the peripheral portion 503. Therefore, when the cylindrical body 30 is inserted into the through hole 502 from a space S1 and abuts against the annular plane 503a side of the peripheral portion 503, the outer peripheral lip 62 and the inner peripheral lip 63 start to bend and deform, and are not caught by the peripheral portion 503. Therefore, the grommet 1 of the present embodiment can reduce the insertion force into the through hole 502.

[0061] Description of Reference Numerals

[0062] 1 Grommet

[0063] 10X Base Parts

[0064] 20 Flange

[0065] 20a Outer peripheral part

[0066] 20c wall

[0067] 30 cylinder

[0068] 30a Outer surface

[0069] 60 Grommet Body

[0070] 60A Waterstop

[0071] 60B Supporting parts

[0072] 61 Main Body

[0073] 61b Inner peripheral part

[0074] 61c Abutment surface

[0075] 62 Peripheral lip

[0076] 63 Inner lip

[0077] 63b Thin wall part

[0078] 65a: first annular portion (annular portion)

[0079] 81 Carding Department

[0080] 501 Insertion object

[0081] 502 Through hole

[0082] 503 Peripheral

[0083] 503a Annular plane

[0084] 504 Annular flat plate

[0085] 504a Inner peripheral portion

[0086] 505 annular protrusion

[0087] 505a Locking end

[0088] S1 One Space

[0089] S2 Another Space

[0090] We Wiring Materials

Claims

1. A grommet, characterized in that: have: a base member made of a synthetic resin material and having a conductive wiring material extending from one space to another space through a through hole of an object to be inserted therein inserted therein; 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 mounted to the peripheral edge of the through hole of the object to be inserted, The base member has an annular flange, the flange being arranged in the one space at the installation completion position, and being arranged coaxially opposite to the annular plane of the one space side of the annular peripheral portion 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 installation completion position, and having a plurality of locking portions in the circumferential direction of the cylindrical body, the locking portions protruding from the outer peripheral surface of the cylindrical body at the other space at the installation completion position and the other space at the installation completion position contacts the peripheral portion from the other space side, The grommet body includes an annular water stop member, and the water stop member is made of a synthetic resin material that is softer than the base member and can be elastically deformed. The water-stop component comprises: an annular main body, which abuts against the annular wall surface on the peripheral portion side of the flange on the same axis; an annular outer peripheral lip, which protrudes from the main body on the same axis toward the peripheral portion in a manner that the closer it approaches to the peripheral portion, the farther it is away from the hole axis of the through hole, and is flexed and deformed at the installation completion position to be tightly attached to the annular plane of the peripheral portion throughout the entire circumference; and an annular inner peripheral lip, which protrudes from the inner peripheral portion side of the main body than the outer peripheral lip on the same axis toward the peripheral portion in a manner that the closer it approaches to the peripheral portion, the closer it approaches to the hole axis of the through hole, and is flexed and deformed at the installation completion position to be tightly attached to the annular plane of the peripheral portion throughout the entire circumference.

2. The grommet according to claim 1, wherein The inner peripheral lip has a thin-walled portion at a distal end thereof that is capable of bending and deforming.

3. The grommet according to claim 1, wherein: The peripheral portion comprises: an annular flat plate portion, the annular flat plate portion being provided with the annular plane; and an annular protrusion that protrudes from an end portion of the inner peripheral edge of the annular flat plate portion toward the other space and locks the locking portion at the end of the protruding direction.

4. The grommet according to claim 1, 2 or 3, wherein: The grommet body includes an annular supporting member, the supporting member is made of a synthetic resin material harder than the water stop member and is integrated with the water stop member. The support member includes an annular portion disposed coaxially opposed to an annular contact surface of the main body that contacts the wall surface of the flange with a gap therebetween. The base member has an outer peripheral edge portion of the flange fitted into the annular gap between the abutting surface of the body and the annular portion.

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