WO2022181551A1

WO2022181551A1 - Sealing structure

Info

Publication number: WO2022181551A1
Application number: PCT/JP2022/006997
Authority: WO
Inventors: 伊藤慶一; 松元隆志
Original assignee: 本田技研工業株式会社
Priority date: 2021-02-25
Filing date: 2022-02-21
Publication date: 2022-09-01
Also published as: JPWO2022181551A1

Abstract

This sealing structure (50) is configured by interposing a sealing element (52A) between a first casing body (16) and a second casing body (14). A base part (54) of the sealing element extends along an opening in the second casing body. The base part has a first outer surface (54a) that faces an outer wall (36b) of the first casing, and a second outer surface (54b) that faces an inner wall (14a) of the second casing. The sealing element has at least one lip part (70, 72, 74). The at least one lip part protrudes from the second outer surface of the base part toward the inner wall of the second casing body and abuts the inner wall of the second casing body.

Description

Seal structure

The present invention relates to a seal structure that seals between a first casing body and a second casing body with a sealing material.

When combining the first casing body and the second casing body, it may be necessary to keep the space between the first casing body and the second casing body airtight or liquid-tight. In this case, the sealing material is sandwiched between the first casing body and the second casing body. For example, in JP-A-2019-106307, the opening edge of the lower case (first casing body) and the opening edge of the upper case (second casing body) are overlapped. As shown particularly in FIGS. 2 and 4 of JP-A-2019-106307, in this case, a sealing material is sandwiched between the lower case and the upper case.

A predetermined portion of the first casing body may be inserted into the opening of the second casing body. For example, in JP-A-2012-186069, a battery lid (second casing body) is attached to an opening formed in a housing (first casing body). A protrusion protrudes from the bottom of the battery lid. In this case, a sealing material is provided on the outer wall of the protrusion. When the battery cover is attached to the housing, the sealing material abuts against the inner wall of the housing. As a result, the sealing material is located between the outer wall of the protrusion and the inner wall of the housing. Thereby, the space between the battery lid and the housing is sealed.

In Japanese Patent Application Laid-Open No. 2012-186069, the sealing material attached to the protrusion of the battery lid comes into sliding contact with the inner wall of the housing while the battery lid is being attached to the housing. Along with this, a frictional force acts on the sealing material. The direction in which the frictional force acts is opposite to the direction in which the battery lid is inserted into the housing. The direction opposite to the insertion direction is the direction toward the base end of the protrusion (the bottom of the battery cover).

As shown in FIG. 4 of Japanese Patent Laid-Open No. 2012-186069, etc., general sealing materials are rounded. Therefore, the cross section along the thickness direction of the sealing material has a substantially circular shape. If the above-described frictional force acts on such a sealing material, there is a concern that the sealing material will rotate toward the bottom of the battery lid. In addition, there is a concern that the sealing material may turn over. If such a situation were to occur, there is a possibility that the sealing performance of the sealing material would deteriorate. Further, if the sealing material is turned over, the frictional force increases further, so a large insertion force is required to attach the battery cover to the housing. Therefore, the mounting work is not easy.

A main object of the present invention is to provide a seal structure that ensures the sealing performance of the sealing material.

Another object of the present invention is to provide a seal structure that facilitates assembly of the first casing body to the second casing body.

According to one embodiment of the present invention, a sealing structure in which a sealing material is interposed between a first casing body and a second casing body having an opening into which the first casing body is inserted,
The seal member has a first outer surface facing the outer wall of the first casing body and a second outer surface facing the inner wall of the second casing body, and extends along the opening of the second casing body. a solid base;
at least one lip projecting from the second outer surface of the base toward the inner wall of the second casing body;
with
A seal structure is provided in which the at least one lip portion abuts the inner wall of the second casing body.

According to the present invention, when the first casing body is inserted into the opening of the second casing body, the lip portion of the sealing material comes into sliding contact with the inner wall of the second casing body. Therefore, application of an excessive load to the lip portion of the sealing material can be avoided. Therefore, rotation of the base of the sealing material is avoided. In addition, it is possible to prevent the base portion of the sealing material from being turned up (twisted). As a result, the sealing ability of the sealing material is sufficiently ensured.

In the sealing material, the thickness is defined as the dimension along the insertion direction of the first casing body. The thickness of the lip portion is smaller than the thickness of the base portion. When the lip portion having such a small thickness slides against the inner wall of the second casing body, the frictional force between the sealing material (lip portion) and the second casing body is small. Therefore, it becomes easy to insert the first casing body into the opening of the second casing body. This facilitates the work of attaching the first casing body to the second casing body.

FIG. 1 is a schematic overall perspective view of a battery pack provided with a seal structure according to an embodiment of the present invention. 2 is an exploded perspective view of the battery pack of FIG. 1. FIG. FIG. 3 is an enlarged vertical cross-sectional view of the main part of the battery pack. FIG. 4 is an enlarged vertical cross-sectional view of a main part, showing a state before the top cover (first casing body) is inserted into the casing body (second casing body). FIG. 5 is an enlarged longitudinal cross-sectional view of a main part of a top cover having a draft angle and a sealing member having a lip portion corresponding to the draft angle. FIG. 6 is an enlarged longitudinal cross-sectional view of a main part of a top cover having a draft angle and a sealing member having a protrusion corresponding to the draft angle. FIG. 7 is an enlarged longitudinal cross-sectional view of a main part of a casing main body having a draft and a sealing material having a lip corresponding to the draft.

Preferred embodiments of the seal structure according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this embodiment, the case where the sealing structure is provided in the battery pack is illustrated. Also, "bottom" and "top" below correspond to the bottom and top of each drawing. However, these directions are for convenience to simplify the description and facilitate understanding. These directions do not necessarily refer to directions or attitudes when discharging or charging the battery pack.

FIG. 1 is a schematic overall perspective view of a battery pack 10 provided with a seal structure 50 (see FIG. 3) according to this embodiment. FIG. 2 is an exploded perspective view of the battery pack 10. FIG. Battery pack 10 includes bottom cover 12 and casing 18 . The casing 18 includes a casing main body 14 as a second casing body and a top cover 16 as a first casing body. A core pack, a battery management unit, and the like are housed inside the casing 18 . A core pack is constructed by holding a plurality of single cells with a cell holder. A connector is provided on the bottom cover 12 . A connector draws power from the plurality of single cells during discharge. The connector also provides power to the single cell during charging. Since the items to be stored in the casing 18, connectors, and the like are known, illustration and detailed description thereof will be omitted.

The casing main body 14 is made of a long hollow square cylindrical body. The lower end and the upper end, which are both ends in the longitudinal direction (axial direction) of the casing main body 14, are open. A lower end opening (lower opening 20 ) of the casing main body 14 is closed by the bottom cover 12 . An upper end opening (upper opening 22 ) of the casing body 14 is closed with a top cover 16 . As shown in FIG. 3, an annular stopper wall 24 is provided in the vicinity of the upper opening 22 on the inner wall 14a of the casing body 14. As shown in FIG. The annular stopper wall 24 protrudes inward of the casing body 14 in a rectangular shape. The top cover 16 is blocked by this annular stopper wall 24 .

As shown in FIG. 2, the top cover 16 has a rectangular frame portion 36 and a handle portion 38. The handle portion 38 protrudes from the upper edge of the rectangular frame portion 36 . As shown in FIG. 3 , a stepped projection 39 is provided on the lower end surface 36 a of the square frame portion 36 . The stepped protrusion 39 has a short rectangular prism shape and protrudes downward from the top cover 16 . A step is formed between the lower end surface 36 a of the square frame portion 36 and the stepped protrusion 39 . A head receiving portion 40 projecting toward the casing main body 14 is provided on the outer side surface 36 b (outer wall) of the square frame portion 36 . That is, the head receiving portion 40 protrudes annularly outward from the top cover 16 .

In the top cover 16 , the lower part of the rectangular frame portion 36 is inserted into the upper opening 22 of the casing main body 14 . That is, the insertion of the top cover 16 into the casing main body 14 is started from the stepped protrusion 39 and the lower end face 36a of the square frame portion 36. As shown in FIG. On the other hand, insertion of the casing body 14 into the top cover 16 is started from the upper opening 22 . Hereinafter, the end from which insertion is started is also referred to as the "insertion start side". The end portion where the insertion ends is also referred to as the “insertion end point side”.

Between the outer side surface 36b of the square frame portion 36 and the inner wall 14a near the upper opening 22 of the casing main body 14, a sealing material 52A shown in FIGS. 2 and 3 is interposed. A seal structure 50 according to the present embodiment includes a casing main body 14 as a second casing body, a square frame portion 36 of a top cover 16 (first casing body), and a seal member 52A.

As shown in detail in FIG. 3, the sealing material 52A has a solid base 54 that is a substantially rectangular annular body. A leg portion 56 is provided at the lower end of the base portion 54 . The lower end of the base portion 54 is located on the insertion start side of the top cover 16 with respect to the casing main body 14 . Therefore, when the top cover 16 (rectangular frame portion 36) is inserted into the casing main body 14, the leg portion 56 of the sealing member 52A is inserted into the casing main body 14 first.

The leg portion 56 annularly protrudes from the lower end of the base portion 54 toward the lower end surface 36 a of the square frame portion 36 . In other words, the leg portion 56 protrudes toward the rectangular frame portion 36 . The end face of the rectangular frame portion 36 on the insertion start side with respect to the casing main body 14 is a lower end face 36a. The lower end surface 36 a receives the foot portion 56 . Thus, the lower end surface 36a of the square frame portion 36 is a receiving portion that receives the foot portion 56. As shown in FIG. The thickness of the leg portion 56 along the axial direction of the battery pack 10 (vertical direction in FIGS. 2 and 4) is relatively large. Specifically, the thickness of the leg portion 56 is approximately the same as the step between the lower end surface 36 a and the stepped protrusion 39 .

The base 54 extends along the axial direction of the casing body 14 . Base 54 is longer than foot 56 . The base portion 54 has an annular shape along the upper opening 22 of the casing body 14 . The base portion 54 is sandwiched between the outer side surface 36b of the rectangular frame portion 36 and the inner wall 14a near the upper opening 22 of the casing body 14. As shown in FIG. Accordingly, the inner peripheral surface 54a of the base portion 54 faces the outer surface 36b of the rectangular frame portion 36. As shown in FIG. That is, the inner peripheral surface 54a is a first outer surface facing the outer wall of the top cover 16 (first casing body). An outer peripheral surface 54b of the base portion 54 faces the inner wall 14a of the casing main body 14 . That is, the outer peripheral surface 54b is a second outer surface facing the inner wall 14a of the casing body 14 (second casing body).

A plurality of (three in this embodiment)

projections

60 , 62 , 64 are annularly formed on the inner peripheral surface 54 a toward the outer surface 36 b of the square frame portion 36 . The

projections

60 , 62 , 64 are arranged in parallel along the direction of insertion of the top cover 16 into the casing body 14 . The

protrusions

60, 62, 64 are spaced apart from each other by a predetermined distance. The

protrusions

60, 62, 64 may protrude slightly. For example, the amount of protrusion can be such that the

protrusions

60 , 62 , 64 are crushed so that the inner peripheral surface 54 a comes into contact with the outer surface 36 b of the square frame portion 36 . The amount of protrusion may be such that the

protrusions

60, 62, 64 are in contact with the outer side surface 36b of the square frame portion 36, while the inner peripheral surface 54a is separated from the outer side surface 36b.

Lip portions

70, 72, and 74 are provided on the outer peripheral surface 54b.

Lip portions

70 , 72 , 74 protrude toward inner wall 14 a of casing body 14 . The number of

lips

70, 72, 74 matches the number of

projections

60, 62, 64. As shown in FIG. In this embodiment, since the number of

projections

60, 62, 64 is three, the number of

lips

70, 72, 74 is also three. The

lip portions

70 , 72 , 74 are arranged side by side along the direction of insertion of the top cover 16 into the casing main body 14 so as to be spaced apart from each other. All of the

lip portions

70 , 72 , 74 abut against the inner wall 14 a of the casing body 14 .

The positions of the

lip portions

70, 72, 74 correspond to the positions of the

protrusions

60, 62, 64. That is, the base portion 54 is sandwiched between the

lip portions

70, 72, 74 and the

projections

60, 62, 64. As shown in FIG. The height positions of the

lip portions

70, 72, 74 from the foot portion 56 and the height positions of the

protrusions

60, 62, 64 from the foot portion 56 are the same. In other words, the

lip portions

70, 72, 74 and the

protrusions

60, 62, 64 protrude in opposite directions at the same height position with respect to the leg portion 56. As shown in FIG. The

protrusions

60 , 62 , 64 or the inner peripheral surface 54 a abut against the outer surface 36 b of the square frame portion 36 . Moreover, the

lip portions

70 , 72 , 74 abut against the inner wall 14 a of the casing body 14 . As a result, the outer surface 36b of the square frame portion 36 of the top cover 16 and the inner wall 14a of the casing body 14 are sealed. In addition, in this embodiment, the

protrusions

60, 62, and 64 have substantially the same amount of protrusion. The protrusion amounts of the

lip portions

70, 72, and 74 are also substantially equal to each other. The amount of projection of the

lip portions

70, 72, 74 is greater than the amount of projection of the

protrusions

60, 62, 64.

The upper end of the base portion 54 is the insertion end point side of the top cover 16 with respect to the casing main body 14 . Hereinafter, this upper end portion is defined as the head, and the reference numeral 76 is used for the head. A projecting end portion 78 is provided on the outer peripheral surface 54 b of the head portion 76 facing the inner wall 14 a of the casing body 14 . The protruding end 78 protrudes annularly toward the inner wall 14 a of the casing body 14 . The protruding end portion 78 protrudes toward the casing body 14 beyond the base portion 54 . When the rectangular frame portion 36 is inserted into the casing main body 14, the projecting end portion 78 projects more than the

lips

70, 72, and 74 project.

The amount of protrusion of the protruding end portion 78 is maximum on the insertion start side close to the base portion 54 and decreases toward the insertion end point side. Therefore, the protruding end portion 78 is inclined so as to separate from the casing main body 14 and approach the top cover 16 as it moves from the insertion start side to the insertion end point side. That is, the protruding end portion 78 becomes narrower with distance from the base portion 54 .

The bottom surface, which is the end surface on the insertion start side, of the projecting end portion 78 is the widest. The lower surface may be slightly spaced from the upper edge surface of the casing body 14 . The lower surface may contact the upper edge surface of the casing body 14 . The illustrated example shows a separated state. Further, the upper portion of the projecting end portion 78 continues to the upper surface of the head portion 76 as an inclined surface. The inclined surface is not in contact with the head receiving portion 40 . That is, the head receiving portion 40 of the top cover 16 receives the head 76 .

The seal structure 50 according to this embodiment is basically configured as described above. Next, the effects of the seal structure 50 will be described.

In order to provide the sealing structure 50, for example, first, the sealing material 52A is attached to the square frame portion 36 of the pre-assembled top cover 16 to obtain the state shown in FIG. In this case, for example, the square frame portion 36 is passed from the head portion 76 of the sealing material 52A. The contact of the head portion 76 with the head receiving portion 40 dams up the seal member 52A. Also, in this case, the leg portion 56 contacts the lower end surface 36 a of the rectangular frame portion 36 . If the inner diameter of the base portion 54 is sufficiently small, the base portion 54 clamps the square frame portion 36 by its elastic action. Along with this, the

projections

60, 62, 64 are crushed. When the amount of crushing of the

protrusions

60 , 62 , 64 is sufficiently large, the inner peripheral surface 54 a of the base portion 54 contacts the outer surface 36 b of the square frame portion 36 .

Next, the top cover 16 with the sealing material 52A attached to the square frame portion 36 is set in a predetermined posture. The predetermined posture is a posture in which the square frame portion 36 faces the upper opening 22 of the casing main body 14 . After that, the square frame portion 36 is inserted into the upper opening 22 . Along with this insertion, as shown in FIG. 3, the sealing material 52A is sandwiched between the outer side surface 36b of the square frame portion 36 and the inner wall 14a of the casing main body 14. As shown in FIG.

During insertion, the

lip portions

70, 72, 74 are in sliding contact with the inner wall 14a of the casing main body 14. On the other hand, the outer peripheral surface 54b of the base 54 keeps a predetermined distance from the inner wall 14a of the casing main body 14. As shown in FIG. Therefore, the application of an excessive load to the base portion 54 due to the sliding contact can be avoided. Rotation of the base 54 is thus avoided. In addition, it is possible to prevent the base portion 54 from being turned up (twisted). Since the thickness of the

lips

70, 72, 74 along the axial direction of the battery pack 10 (the insertion direction of the top cover 16) is sufficiently small, the frictional force between the

lips

70, 72, 74 and the casing body 14 is small. . Therefore, the top cover 16 with the sealing material 52A attached can be easily inserted into the upper opening 22. As shown in FIG. For this reason, the work of attaching the top cover 16 to the casing main body 14 is facilitated.

The sealing member 52A has a protruding end 78 protruding toward the casing body 14 from the base 54. When the

lip portions

70, 72, 74 slide against the inner wall 14a of the casing main body 14, a load acts on the seal member 52A from the insertion start side toward the insertion end point side. It is assumed that this load causes the sealing member 52A to expand or move along the axial direction of the battery pack 10 . In such a case, the head 76 is blocked by the head receiving portion 40 . Also, the load acting on the projecting end portion 78 is transmitted to the head receiving portion 40 via the head portion 76 . That is, the head 76 reliably contacts the head receiving portion 40 . Therefore, the sealing material 52A is prevented from stretching or moving to the extent that it gets over the head receiving portion 40 .

Moreover, the leg portion 56 of the seal member 52A extends toward the lower end surface 36a of the square frame portion 36 of the top cover 16. As shown in FIG. That is, the inner edge of the leg 56 covers the lower end surface 36a. Therefore, it is difficult for the leg portion 56 to separate from the rectangular frame portion 36 . Based on this and the fact that the head 76 is in contact with the head receiving portion 40 as described above, the seal member 52A is firmly positioned. As a result, when the top cover 16 is inserted into the upper opening 22, even if the

lips

70, 72, and 74 slide against the inner wall 14a of the casing body 14, the load prevents the seal member 52A from being displaced. be done. For the above reasons, the operation of assembling the top cover 16 to the casing main body 14 is facilitated. In other words, workability is improved.

The lower end surface of the foot portion 56, which is the insertion start side end surface of the sealing material 52A, contacts the annular stopper wall 24. As shown in FIG. This completes the insertion of the top cover 16 into the upper opening 22 . At this point,

lips

70 , 72 , 74 are collapsed toward base 54 . The top cover 16 is attached to the casing body 14 with bolts (not shown). As the bolts are tightened, mainly the leg portion 56 , the base portion 54 and the head portion 76 are crushed along the axial direction of the battery pack 10 .

The battery pack 10 is housed, for example, in a battery housing of an external load such as an electric vehicle or a generator, and supplies electric power to the external load. Here, in particular electric vehicles are operated outdoors. During this drive, it may rain. A seal is provided between the battery housing portion and the lid portion that closes the battery housing portion. However, if the sealing performance is degraded due to aging of the sealing material, rainwater or muddy water splashed up during operation may enter the battery housing. In this case, there is a concern that the battery pack 10 (particularly the top cover 16) may be exposed to water.

However, in the present embodiment, the sealing structure 50 is formed by sandwiching the sealing material 52A having the above shape between the top cover 16 and the casing main body 14 . As described above, the seal member 52A prevents the base portion 54 from rotating. In addition, it is avoided that the base portion 54 is turned over. As a result, sealing performance is ensured, so rainwater, muddy water, etc. is prevented from entering between the top cover 16 and the casing main body 14 . Thus, according to the seal structure 50 according to this embodiment, excellent sealing performance can be obtained.

When the battery pack 10 supplies power to the external load, the temperature of the external load rises. For this reason, it is assumed that the battery storage portion of the external load is heated, and as a result, the atmosphere inside the battery storage portion expands. In this case, expanded air may enter between the outer side surface 36 b of the square frame portion 36 that is a part of the top cover 16 and the inner wall 14 a of the casing body 14 . In this case, the lip portion 74 positioned closest to the insertion end point among the

lip portions

70, 72, 74 is pressed by the expanded air.

When charging the battery pack 10 whose remaining capacity has decreased, the single cells housed in the casing 18 become hot. As this heat is transferred to the gas (typically an inert gas) enclosed within casing 18, it is assumed that the gas expands. In this case, if expanded gas enters between the outer side surface 36b of the square frame portion 36 and the inner wall 14a of the casing body 14, the lip portion positioned closest to the insertion start side among the

lip portions

70, 72, and 74 70 is pressed with expanded gas.

For the above reasons, the

lip portions

70 and 74 may be deformed. However, in this embodiment, three

lips

70, 72, 74 are provided. Even if the

lips

70, 74 are deformed as described above, the lip 72 retains its original shape. Therefore, the sealing performance is ensured by the lip portion 72 . Therefore, it is possible to prevent liquid such as rain water or muddy water from entering the casing 18 in the same manner as described above. The same is true when four or more lip portions are provided.

It should be noted that the present invention is not limited to the above-described embodiments, and can take various configurations without departing from the gist of the present invention.

For example, in the top cover 16 shown in FIGS. 1 to 4, the outer side surface 36b of the square frame portion 36 has a substantially linear shape extending along the axial direction of the battery pack 10. As shown in FIG. However, as shown in FIG. 5, the outer side surface 36b of the square frame portion 36 may be inclined so as to approach the casing main body 14 from the insertion start side toward the insertion end point side. Top cover 16 is generally made of resin. By forming the outer side surface 36b into such a shape, it becomes easy to separate from the mold after molding. That is, in this case, a so-called draft angle 80 is formed on the outer surface 36b.

In this case, it is preferable to incline the base portion 54 of the sealing material 52B along the outer surface 36b. The amount of protrusion of the lip portion 70 on the insertion start side where the base portion 54 is most distant from the casing main body 14 is maximized. In addition, the protrusion amount of the lip portion 74 on the side of the insertion end point where the base portion 54 comes closest to the casing main body 14 is minimized. The amount of protrusion of the

lip portions

70 , 72 , 74 is determined so that each tip of the

lip portions

70 , 72 , 74 abuts the inner wall 14 a of the casing main body 14 .

Alternatively, as shown in FIG. 6, the base portion 54 of the sealing material 52C may be linear along the direction in which the top cover 16 is inserted into the casing main body 14. Specifically, the base portion 54 has a linear shape extending along the inner wall 14 a of the casing body 14 . In this case, the amount of projection of the protrusion 60 on the insertion start side is maximized, and the amount of protrusion of the protrusion 64 on the insertion end point side is minimized.

As shown in FIG. 7, it is also possible to form a draft angle 82 in the casing body 14 . In this case, the inner wall 14a of the casing body 14 is inclined. Specifically, the inner wall 14a approaches the square frame portion 36 of the top cover 16 as it goes from the insertion start side (upper opening 22) of the casing main body 14 into the top cover 16 toward the insertion end point side (annular stopper wall 24). tilt to

When the sealing material 52D is attached to the square frame portion 36, it is not particularly necessary to incline the base portion 54 of the sealing material 52D. That is, the base portion 54 of the sealing material 52D can be formed in a linear shape along the outer side surface 36b of the rectangular frame portion 36. As shown in FIG. In this case, the lip portion 70 on the insertion start side comes closest to the casing main body 14 . The lip portion 74 on the insertion end point side is the farthest away from the casing body 14 . Therefore, the amount of protrusion of the lip portion 70 is minimized, and the amount of protrusion of the lip portion 74 is maximized. Similarly to the above, the amount of protrusion of the

lip portions

70 , 72 , 74 is determined so that the tips of the

lip portions

70 , 72 , 74 abut against the inner wall 14 a of the casing body 14 .

Draft angles 80 and 82 may be provided on both the outer surface 36b of the square frame portion 36 and the inner wall 14a of the casing main body 14. In this case, the projection amounts of the

projections

60, 62, 64 and the projection amounts of the

lip portions

70, 72, 74 are appropriately determined.

It is also possible to provide the projecting end portion 78 with a narrow upper surface interposed between the inclined surface and the head receiving portion 40 and to bring the upper surface into contact with the head receiving portion 40 .

In addition, the present invention is not limited to application to the battery pack 10. INDUSTRIAL APPLICABILITY The present invention can be employed as a configuration for sealing between the first casing body and the second casing body in the general combination of the first casing body and the second casing body.

Claims

A sealing structure (50) in which a sealing material (52A) is interposed between a first casing body (16) and a second casing body (14) having an opening (22) into which the first casing body is inserted. ) and
The seal member has a first outer surface (54a) facing the outer wall (36b) of the first casing body and a second outer surface (54b) facing the inner wall (14a) of the second casing body. 2 a solid base (54) extending along said opening in the casing body;
at least one lip (70, 72, 74) projecting from said second outer surface of said base towards said inner wall of said second casing body;
with
A sealing structure in which the at least one lip portion contacts the inner wall of the second casing body.
2. The seal structure according to claim 1, wherein said at least one lip portion has three or more lip portions, and said three or more lip portions are aligned in an insertion direction of said first casing body with respect to said second casing body. seal structures juxtaposed along and spaced from each other.
A seal structure according to claim 1 or 2, wherein the seal has a head (76),
The head is an end of the base on the insertion end point side of the first casing body with respect to the second casing body,
A seal structure in which a head receiving portion (40) for blocking the head is protruded from the outer wall of the first casing body.
The seal arrangement of claim 3, wherein said seal has a protruding end (78),
A seal structure in which the projecting end portion is provided on a surface of the head portion facing the second casing body, and projects further toward the second casing body than the base portion.
The sealing structure according to any one of claims 1 to 4, wherein the sealing material has a foot portion (56) on an insertion start side of the first casing body with respect to the second casing body,
the foot protrudes toward the first casing body more than the base;
A seal structure in which the first casing body receives the leg portion at an end face on an insertion start side with respect to the second casing body.
The sealing structure according to any one of claims 1 to 5, wherein at least one protrusion (60, 62, 64) is provided on the first outer surface of the base of the sealing material,
The at least one protrusion is provided on the first outer surface at a position corresponding to the position of the at least one lip provided on the second outer surface and extends toward the outer wall of the first casing body. Protruding seal structure.
The seal structure according to any one of claims 1 to 6, wherein the outer wall of the first casing body approaches the second casing body from the insertion start side toward the insertion end point side with respect to the second casing body. A seal structure that is slanted to
8. The seal structure of claim 7, wherein said seal is attached to said first casing body, said base of said seal sloping along said outer wall of said first casing body, and said at least one lip. A seal structure in which the amount of protrusion of the portion toward the second casing body is large on an insertion start side of the first casing body with respect to the second casing body and small on an insertion end point side.
A seal structure according to claim 7, which is dependent on claim 6, wherein said sealing member is attached to said first casing body, and said base portion of said sealing member extends in an insertion direction of said first casing body with respect to said second casing body. and the amount of protrusion of the protrusion to the first casing body is large on the insertion start side of the first casing body with respect to the second casing body and small on the insertion end point side structure.
The seal structure according to any one of claims 1 to 6, wherein the inner wall of the second casing body approaches the first casing body from the insertion start side toward the insertion end point side of the first casing body. A seal structure that is slanted to
11. The sealing structure according to claim 10, wherein the sealing material is attached to the first casing body, and the amount of protrusion of the at least one lip portion of the sealing material toward the second casing body is equal to that of the first casing body. A seal structure that is large on the insertion start side with respect to the second casing body and small on the insertion end point side.