JP2024041409A - Packing, packing assembly, seal structure - Google Patents

Abstract

[Problem] When sealing a through hole with a tapered surface with a packing, the packing is made small and the through hole is prevented from becoming large. [Solution] In a seal structure 9 between a through hole 24 of a housing 21 and a third housing 6, the third housing 6 has an insertion part 62 and a non-insertion part 61, and a fourth packing 7 is installed in a mounting groove 65 at the boundary between them. The fourth packing 7 is formed in an annular shape and has a first groove 71a, a second groove 72a, and a third groove 73a. When the insertion part 62 is inserted into the through hole 24 and the non-insertion part 61 abuts against the outer surface 21a of the housing 21, the edge 25 of the through hole 24 pushes and spreads the first groove 71a to make tight contact, and the part 75 enters between the tapered surface 24b and the insertion part 62 to axially seal the space S, and the part 76 extends outward to make a surface seal between the outer surface 21a of the housing 21 and the back surface of the mounting groove 65. [Selected Figure] Fig. 8

Description

The present invention relates to a packing, a packing assembly in which the packing is attached to a mounted component, and a seal structure using the packing.

A connector shown in FIG. 9, for example, is known as a connector inserted into a through hole formed in a device housing (see Patent Document 1).

The connector 110 shown in FIG. 9 is inserted into a through hole 122 formed in a housing 121 of a device 120 and bolted to the housing 121, and includes a connector body 111 and a packing attached to the connector body 111. 112, 113.

The through hole 122 is composed of a hole body portion 122a formed near the inner surface of the housing 121 and a tapered portion 122b formed near the outer surface of the housing 121. The tapered portion 122b is formed so that its diameter gradually decreases as it approaches the hole body portion 122a from the outer surface of the housing 121.

The packing 113 seals between the connector body 111 and the inner surface of the hole body portion 122a. The packing 112 seals between the connector body 111 and the inner surface of the tapered portion 122b. The space between the connector main body 111 and the inner surface of the tapered portion 122b is a triangular space in the cross-sectional shape shown in FIG. Therefore, the packing 112 accommodated in this space has a V-shaped cross section and has an inner cylinder part 112a and an outer cylinder part 112b.

Japanese Patent Application Publication No. 2020-113418

The above-mentioned packing 112 having a V-shaped cross section needs to be thick in order to ensure waterproof performance, resulting in a large size. Therefore, the space of the tapered portion 122b in which the packing 112 is accommodated has become large.

Therefore, an object of the present invention is to reduce the size of the packing and suppress the enlargement of the through-hole when sealing the through-hole having a tapered surface with a packing.

The present invention is an annular packing having a first groove formed on one surface in the central axis direction, a second groove formed on the inner circumferential surface, and a third groove formed on the outer circumferential surface. It is characterized by having grooves formed therein.

The present invention includes the above-mentioned packing and a component to be mounted, wherein the component to be mounted includes an insertion part inserted into a through hole formed in a casing, and a part connected to one end of the insertion part and connected to the through hole. a non-insertion part positioned outside and in contact with the outer surface of the casing, and the packing is provided at the boundary between the insertion part and the non-insertion part in an orientation such that the first groove is located on the casing side. This is a packing assembly characterized by being equipped with.

The present invention includes the above-mentioned packing assembly and a casing in which a through hole is formed, and the inner surface of the through hole is parallel to a parallel surface parallel to the central axis of the through hole, and a tapered surface that is inclined with respect to the housing, the tapered surface and the outer surface of the casing intersect to form an edge of the through hole, and the insertion portion is inserted into the through hole and the non-inserted portion is inserted into the through hole. When the part is in contact with the outer surface of the casing, the edge of the through hole pushes out the first groove and comes into close contact with the first groove, thereby sealing between the through hole and the mounted component. It has a seal structure that is characterized by

According to the present invention, when sealing a through hole in which a tapered surface is formed with a packing, the packing can be downsized and the through hole can be prevented from increasing in size.

FIG. 2 is a diagram showing a shield connector and a casing of a mating device that constitute a seal structure according to an embodiment of the present invention. FIG. 2 is an exploded view of the shield connector of FIG. 1; FIG. 2 is an exploded view of the shield connector of FIG. 1; 2 is a cross-sectional view showing a state in which the shield connector of FIG. 1 is connected to a mating device. FIG. 5 is an enlarged view of the main part of FIG. 4. FIG. 4 is an enlarged view of the fourth packing in FIG. 3. FIG. 7 is a sectional view taken along line AA in FIG. 6. FIG. FIG. 6 is a diagram showing a state before the fourth packing in FIG. 5 comes into contact with the casing of the counterpart device. FIG. 11 is a cross-sectional view showing a conventional sealing structure between a connector and a mating device.

A "packing," a "packing assembly," and a "seal structure" according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8.

FIG. 1 is a diagram showing a shield connector 10 (corresponding to a "packing assembly") and a housing 21 of a mating device 2, which constitute a seal structure 9 according to an embodiment of the present invention.

The shield connector 10 is connected to the terminals of two shielded electric wires 11 to constitute the automobile wire harness 1.

The counterpart device 2 is mounted on an automobile and includes a metal casing 21. Note that in FIGS. 1 and 4, only a part of the housing 21 is shown. The housing 21 is formed with a through hole 24 through which the second terminal 81 of the shield connector 10 and the third housing 6 pass.

The through hole 24 is formed in a rectangular shape with rounded corners. A tapered surface 24b is formed on the outer surface of the housing of the through hole 24 to facilitate insertion of the third housing 6 into the through hole 24. That is, as shown in FIG. 5, the inner surface of the through hole 24 has a parallel surface 24a parallel to the central axis of the through hole 24, and a tapered surface 24b inclined with respect to the central axis of the through hole 24. . This tapered surface 24b and the outer surface 21a of the housing 21 intersect to form an edge 25 of the through hole 24.

As shown in FIG. 1, inside the housing 21, there are provided a device-side terminal 23 that is connected to the second terminal 81 passed through the through-hole 24, and a terminal block 22 that holds the device-side terminal 23. It is being The device-side terminal 23 and the second terminal 81 are connected to each other by being fixed with bolts while being stacked on top of each other. In this example, two second terminals 81 and two device-side terminals 23 are provided.

As shown in FIGS. 2 and 3, the shield connector 10 includes a first housing 12, two first packings 13, two shield members 14, two sleeves 25, two first terminals 16, and a shield. The shell 3, the second housing 5, the second packing 4, the two second terminals 81, the third housing 6 (corresponding to "mounted parts"), the third packing 82, and the fourth packing 7 ( (equivalent to "packing"), a fifth packing 83, and a front cap 84.

The first housing 12 is a synthetic resin housing that holds the two shielded wires 11. This first housing 12 is fixed to the bottom surface of the shield shell 3 with bolts 17.

The first packing 13 is attached to the outer periphery of the shielded wire 11 and seals between the shielded wire 11 and the shield shell 3.

The shielding member 14 electrically connects the braid, which is a component of the shielded electric wire 11, to the shielding shell 3 and is made of metal.

The sleeve 25 is attached to the outer periphery of the shielded wire 11 and sandwiches the shield member 14 between it and the first packing 13.

The first terminal 16 is obtained by pressing a metal plate, and is connected to the core wire of the shielded wire 11 .

The shield shell 3 covers the second housing 5 and is made of metal. The shield shell 3 has a rectangular outer shape. The shield shell 3 includes a first recess 31 formed concavely from the front to the back side, a second recess 32 formed further concavely from the back surface 34 of the first recess 31 to the back side, and a second recess 32 formed from the bottom surface. Two holes 33 passing through the recess 32 are formed. The back surface 34 is a square frame-shaped plane when viewed from the front side, and surrounds the second recess 32. The second housing 5 is fitted into the first recess 31 and the second recess 32 . Each shielded wire 11 is passed through each of the two holes 33.

The second housing 5 is a synthetic resin housing that holds the first terminal 16 and the second terminal 81. The second housing 5 includes a square plate-shaped plate portion 52 and a protrusion portion 51 protruding from the back surface of the plate portion 52. The plate portion 52 is fitted into the first recess 31 of the shield shell 3. The protrusion 51 is fitted into the second recess 32 of the shield shell 3. The second housing 5 is fixed to the shield shell 3 by bolts 19.

The second housing 5 has a concave portion 53 formed concavely from the front side of the plate portion 52 toward the protruding portion 51 side, and a concave portion formed further concavely from the back surface of the concave portion 53 , which bends at a right angle midway to face the bottom surface of the protruding portion 51 . An insertion hole 54 is formed which is open to the inside. Two insertion holes 54 are formed. Each insertion hole 54 is formed so as to be continuous with each hole 33 of the shield shell 3.

The second packing 4 is a surface seal packing that performs a surface seal between the inner surface 34 of the shield shell 3 and the plate portion 52 of the second housing 5 (seals between mutually opposing planes). The second packing 4 includes a seal portion 41 formed in the shape of a square frame, and fixing portions 44 provided at the four corners of the seal portion 41. The second packing 4 is attached to the plate portion 52 of the second housing 5, and each fixing portion 44 is fixed to a fixed portion provided on the plate portion 52.

The second terminal 81 is obtained by press working or the like on a metal plate, and has an L-shape with the middle portion bent at a right angle. One end side of the second terminal 81 is fixed with a bolt 18 in a state where it is overlapped with the first terminal 16. This electrically connects the second terminal 81 and the first terminal 16. The other end side of the second terminal 81 is connected to the device side terminal 23 as described above.

The third housing 6 is a synthetic resin housing that holds the second terminal 81. As shown in FIG. 4, the third housing 6 includes a base 61 that is fitted into the recess 53 of the second housing 5, and an insertion portion 62 that protrudes from the front of the base 61 and is inserted into the through hole 24 of the housing 21. , is equipped with.

The insertion portion 62 has a rectangular shape with rounded corners when viewed from the front and fits into the through hole 24 of the housing 21 , and the length of the insertion portion 62 protrudes from the base portion 61 is slightly larger than the thickness of the housing 21 . The base 61 has a plate shape that is one size larger than the through hole 24, is positioned outside the through hole 24, and comes into contact with the outer surface 21a of the housing 21. Hereinafter, the base portion 61 will be referred to as the non-insertion portion 61.

The third housing 6 is formed with two insertion holes 63 through which the other end of the second terminal 81 passes. A groove 64 for mounting the third packing 82 is formed on the outer peripheral surface of the non-insertion portion 61 . The third packing 82 is formed in an annular shape and is mounted in the mounting groove 64 to seal between the non-insertion portion 61 and the recess 53 of the second housing 5. A groove 65 for mounting the fourth packing 7 is formed at the boundary between the insertion part 62 and the non-insertion part 61. The fourth packing 7 is formed in an annular shape and is mounted in the mounting groove 65 to seal between the boundary portion and the edge 25 of the through hole 24 . An annular fifth packing 83 is attached to the outer peripheral surface of the insertion portion 62 . The fifth packing 83 seals between the insertion portion 62 and the parallel surface 24a of the through hole 24.

The front cap 84 is a component made of synthetic resin, and is placed over the insertion portion 62 of the third housing 6 to prevent the fifth packing 83 from falling off. Two holes 85 are formed in the front cap 84 and are respectively continuous with the two insertion holes 63 of the third housing 6 . Each second terminal 81 projects from each hole 85 .

Next, the seal structure 9 between the shield connector 10 and the housing 21 will be described in more detail. The fourth packing 7 constituting the seal structure 9 is made of natural rubber, synthetic rubber, silicone rubber, or the like. The fourth packing 7 is formed in an annular shape, as shown in FIG.

As shown in FIGS. 7 and 8, the fourth packing 7 has a first groove 71a formed in one surface 71 in the central axis direction, and a second groove 72a formed in the inner peripheral surface 72. A third groove 73a is formed in the outer peripheral surface 73. In this example, the first groove 71a, the second groove 72a, and the third groove 73a have a V-shaped cross section, and the fourth packing 7 in its natural state, which is not elastically deformed, has a K-shaped cross section. It is formed.

The mounting groove 65 of the fourth packing 7 is formed in an annular shape surrounding the insertion portion 62. The mounting groove 65 is open to the housing 21 side. The inner surface of the mounting groove 65 is formed flush with the outer peripheral surface of the insertion portion 62.

As shown in FIG. 8, in the fourth packing 7, one surface 71 and the first groove 71a in the central axis direction are located on the housing 21 side, and the other surface 74 in the central axis direction is located in the mounting groove 65. It is mounted in the mounting groove 65 in a direction along the back surface. In the fourth packing 7 before contacting the casing 21 shown in FIG. 8, one surface 71 in the central axis direction protrudes from the mounting groove 65 toward the casing 21 side. Further, the outer circumferential surface 73 is spaced from the inner surface of the mounting groove 65.

As shown in FIGS. 4 and 5, when the insertion portion 62 is inserted into the through hole 24 and the non-insertion portion 61 is in contact with the outer surface 21a of the housing 21, the edge 25 of the through hole 24 is aligned with the first groove. 71a is pushed out and in close contact. In this state, a portion 75 of the fourth packing 7 on the inner peripheral side and the housing 21 side enters the space S between the tapered surface 24b and the insertion portion 62, and the portion 75 between the tapered surface 24b and the insertion portion 62 ( Shaft seal area). Furthermore, a portion 76 on the outer circumferential side of the fourth packing 7 and on the side of the housing 21 extends outward from the fourth packing 7 between the outer surface 21a of the housing 21 and the inner surface of the mounting groove 65 (face seal area). The surface is sealed.

In this way, when the insertion part 62 is inserted into the through hole 24, the fourth packing 7 has parts 75 and 76 fitted to the edge 25 of the through hole 24, and the part 75 enters the space S, thereby creating a surface seal. It functions as a packing and a shaft seal packing (functions as a face-shaft integrated packing), and exhibits high waterproof performance despite its small size. Further, the reason why the portions 75 and 76 can be deformed in this way is because the second groove 72a and the third groove 73a function as relief allowances.

According to the seal structure 9 of this example, by making the fourth packing 7 have the above configuration, it can be made smaller than the conventional product having a V-shaped cross section, and the space between the tapered surface 24b of the through hole 24 and the insertion portion 62 can be reduced. S can be made small.

Note that in this example, the other surface 74 of the fourth packing 7 in the central axis direction is a flat surface with no groove formed therein, but a groove is provided on this other surface 74 as an escape allowance. It's okay. In this case, the fourth packing has an X-shaped cross-section in its natural state.

The above-mentioned embodiment merely shows a typical form of the present invention, and the present invention is not limited to this embodiment. In other words, the present invention can be implemented with various modifications within the scope of the gist of the present invention. As long as the configuration of the present invention is still included in such modifications, it is of course included in the scope of the present invention.

6 Third housing (mounted parts)
7 4th packing (packing)
9 Seal structure 10 Shield connector (packing assembly)
21 Housing 21a External surface 24 Through hole 24b Tapered surface 25 Edge 61 Non-insertion part 62 Insertion part 71a First groove 72a Second groove
73a Third groove

Claims (5)

It is a ring-shaped packing,
A first groove is formed on one surface in the central axis direction,
A second groove is formed on the inner peripheral surface,
A packing characterized in that a third groove is formed on the outer peripheral surface. The first groove, the second groove, and the third groove have a V-shaped cross section,
The packing according to claim 1, wherein the packing has a K-shaped cross section in its natural state. Comprising the packing according to claim 1 or 2 and a mounted component,
The to-be-installed component includes an insertion part that is inserted into a through hole formed in the housing, and a non-insertion part that is connected to one end of the insertion part, is positioned outside the through hole, and comes into contact with the outer surface of the housing. and,
The packing assembly is characterized in that the packing is attached to a boundary between the insertion part and the non-insertion part in such a direction that the first groove is located on the housing side. The packing assembly according to claim 3, wherein a groove for mounting the packing is formed at a boundary between the insertion part and the non-insertion part. Comprising the packing assembly according to claim 3 and a casing in which a through hole is formed,
The inner surface of the through hole has a parallel surface parallel to the central axis of the through hole, and a tapered surface inclined with respect to the central axis of the through hole,
The tapered surface and the outer surface of the casing intersect to form an edge of the through hole,
When the insertion part is inserted into the through-hole and the non-insertion part is in contact with the outer surface of the housing, the edge of the through-hole pushes the first groove outward and comes into close contact with the first groove. A seal structure, wherein a seal is formed between the through hole and the mounted component.

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