Seal structure

Abstract

To provide a seal structure easy in attachment work.SOLUTION: A seal structure (50) is configured by interposing a seal material (52A) between a first casing body (16) and a second casing body (14). A base (54) of the seal material extends along an opening of the second casing body. The base 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 body. The seal material has at least one lip (70, 72, 74). The at least one lip protrudes from the second outer surface of the base toward the inner wall of the second casing body and abuts on the inner wall of the second casing body.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a seal structure for sealing between a first casing body and a second casing body with a sealant. [Background technology]

[0002] When the first casing body and the second casing body are assembled, it may be necessary to keep the space between the first casing body and the second casing body airtight or liquidtight. In this case, a sealant is sandwiched between the first casing body and the second casing body. For example, in JP 2019-106307 A, 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 in JP 2019-106307 A, particularly in Figs. 2 and 4, in this case, a sealant is sandwiched between the lower case and the upper case.

[0003] There are also cases where a predetermined portion of the first casing body is inserted into an opening of the second casing body. For example, in JP 2012-186069 A, 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 sealant is provided on the outer wall of the protrusion. When the battery lid is attached to the housing, the sealant abuts against the inner wall of the housing. As a result, the sealant is positioned between the outer wall of the protrusion and the inner wall of the housing. This seals the gap between the battery lid and the housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-106307 A [Patent Document 2] JP 2012-186069 A Summary of the Invention [Problem to be solved by the invention]

[0005] In JP 2012-186069 A, during the attachment of the battery lid to the housing, the seal attached to the protrusion of the battery lid slides against the inner wall of the housing. As a result, a frictional force acts on the seal. The direction in which the frictional force acts is opposite to the insertion direction of the battery lid into the housing. The opposite direction to the insertion direction is the direction toward the base end of the protrusion (the bottom of the battery lid).

[0006] As shown in FIG. 4 of JP 2012-186069 A, a typical sealant is rounded. Therefore, the cross section of the sealant along the thickness direction is substantially circular. If the above-mentioned frictional force acts on such a sealant, there is a concern that the sealant will rotate toward the bottom of the battery lid. There is also a concern that the sealant will be turned over. If such a situation occurs, there is a possibility that the sealing performance of the sealant will be reduced. Furthermore, if the sealant is turned over, the frictional force will be even greater, so a large insertion force will be required to attach the battery lid to the housing. This makes the installation work difficult.

[0007] A primary object of the present invention is to provide a seal structure that ensures the sealing performance of a seal material.

[0008] Another object of the present invention is to provide a seal structure that allows easy assembly of a first casing body to a second casing body. [Means for solving the problem]

[0009] According to one embodiment of the present invention, there is provided a seal structure in which a seal 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 sealing material 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 a solid base extending along the opening of the second casing body; at least one lip portion protruding from the second outer surface of the base toward the inner wall of the second casing body; Equipped with A seal arrangement is provided in which the at least one lip portion abuts the inner wall of the second casing body. Effect of the Invention

[0010] 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 seal material slides against the inner wall of the second casing body. This prevents an excessive load from being applied to the lip portion of the seal material. This prevents the base portion of the seal material from rotating. Also, the base portion of the seal material is prevented from turning over (twisting). As a result, the sealing ability of the seal material is sufficiently ensured.

[0011] In the sealing material, the dimension along the insertion direction of the first casing body is defined as the thickness. 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. This makes it easy to insert the first casing body into the opening of the second casing body. This makes it easy to attach the first casing body to the second casing body. [Brief description of the drawings]

[0012] [Figure 1] 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. [Diagram 2] FIG. 2 is an exploded perspective view of the battery pack of FIG. [Diagram 3] FIG. 3 is an enlarged longitudinal sectional view of a main portion of the battery pack. [Figure 4] FIG. 4 is an enlarged longitudinal sectional view of a main part, showing a state before the top cover (first casing body) is inserted into the casing main body (second casing body). [Diagram 5] FIG. 5 is an enlarged longitudinal sectional view of a main portion of a top cover having a draft gradient and a sealing material having a lip portion corresponding to the draft gradient. [Figure 6]FIG. 6 is an enlarged longitudinal sectional view of a main portion of a top cover having a draft and a sealing material having a protrusion corresponding to the draft. [Figure 7] FIG. 7 is an enlarged longitudinal sectional view of a main portion of a casing body having a draft gradient and a sealing material having a lip portion corresponding to the draft gradient. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A preferred embodiment of the sealing structure according to the present invention will be described in detail below with reference to the accompanying drawings. In this embodiment, the sealing structure is provided in a battery pack. In addition, "lower" and "upper" in the following description correspond to the lower and upper sides of the drawings. However, these directions are merely for convenience in order to simplify the description and make it easier to understand. These directions do not necessarily refer to the directions or postures when discharging or charging the battery pack.

[0014] 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. The battery pack 10 includes a bottom cover 12 and a 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 stored inside the casing 18. The core pack is configured by holding a plurality of unit cells with a cell holder. A connector is provided on the bottom cover 12. The connector extracts power from the plurality of unit cells during discharging. The connector also supplies power to the unit cells during charging. Since the contents and connectors in the casing 18 are publicly known, illustrations and detailed descriptions are omitted.

[0015] The casing body 14 is formed of a long, hollow, rectangular tubular body. The casing body 14 has open lower and upper ends, which are both ends in the longitudinal direction (axial direction). The opening at the lower end of the casing body 14 (lower opening 20) is closed by the bottom cover 12. The opening at the upper end of the casing body 14 (upper opening 22) is closed by the top cover 16. As shown in FIG. 3, an annular stopper wall 24 is provided on the inner wall 14a of the casing body 14 near the upper opening 22. The annular stopper wall 24 protrudes inwardly of the casing body 14 in a rectangular shape. The top cover 16 is blocked by this annular stopper wall 24.

[0016] 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 protrusion 39 is provided on a lower end surface 36a of the rectangular frame portion 36. The stepped protrusion 39 has a short rectangular column shape and protrudes downward from the top cover 16. A step is formed between the lower end surface 36a of the rectangular frame portion 36 and the stepped protrusion 39. A head receiving portion 40 protruding in a direction toward the casing body 14 is provided on an outer side surface 36b (outer wall) of the rectangular frame portion 36. That is, the head receiving portion 40 protrudes in an annular shape toward the outside of the top cover 16.

[0017] In the top cover 16, the lower part of the rectangular frame portion 36 is inserted into the upper opening 22 of the casing body 14. That is, insertion of the top cover 16 into the casing body 14 starts from the stepped protrusion 39 and the lower end face 36a of the rectangular frame portion 36. On the other hand, insertion of the casing body 14 into the top cover 16 starts from the upper opening 22. Hereinafter, the end where the insertion starts will also be referred to as the "insertion start side". The end where the insertion ends will also be referred to as the "insertion end side".

[0018] 2 and 3 is interposed 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. The seal structure 50 according to this embodiment includes the casing body 14 which is the second casing body, the rectangular frame portion 36 of the top cover 16 (first casing body), and the seal material 52A.

[0019] 3, the sealing material 52A has a solid base 54 made of a generally rectangular ring-shaped body. A foot 56 is provided at the lower end of the base 54. The lower end of the base 54 is located on the side where the insertion of the top cover 16 into the casing body 14 begins. Therefore, when the top cover 16 (square frame portion 36) is inserted into the casing body 14, in the sealing material 52A, the foot 56 is inserted into the casing body 14 first.

[0020] The foot 56 protrudes in an annular shape from the lower end of the base 54 toward the lower end surface 36a of the square frame 36. In other words, the foot 56 protrudes toward the square frame 36. The end surface of the square frame 36 on the side where insertion into the casing body 14 begins is the lower end surface 36a. The lower end surface 36a receives the foot 56. In this manner, the lower end surface 36a of the square frame 36 is a receiving portion that receives the foot 56. The foot 56 has a relatively large thickness along the axial direction of the battery pack 10 (the vertical direction in FIGS. 2 and 4). Specifically, the thickness of the foot 56 is approximately the same as the step between the lower end surface 36a and the stepped protrusion 39.

[0021] The base 54 extends along the axial direction of the casing body 14. The base 54 is longer than the foot 56. The base 54 has an annular shape along the upper opening 22 of the casing body 14. The base 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. Therefore, the inner peripheral surface 54a of the base 54 faces the outer side surface 36b of the rectangular frame portion 36. That is, the inner peripheral surface 54a is a first outer surface facing the outer wall of the top cover 16 (first casing body). The outer peripheral surface 54b of the base 54 faces the inner wall 14a of the casing 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).

[0022] On the inner circumferential surface 54a, a plurality of protrusions 60, 62, 64 (three in this embodiment) are formed to protrude in an annular shape toward the outer surface 36b of the rectangular frame portion 36. The protrusions 60, 62, 64 are arranged in parallel along the insertion direction 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 protrusions 60, 62, 64 may be crushed to such an extent that the inner circumferential surface 54a abuts against the outer surface 36b of the rectangular frame portion 36. The protrusions 60, 62, 64 may be spaced apart from each other by such an amount that the inner circumferential surface 54a is spaced apart from the outer surface 36b.

[0023] Lip portions 70, 72, 74 are provided on the outer peripheral surface 54b. The lip portions 70, 72, 74 protrude toward the inner wall 14a of the casing body 14. The number of the lip portions 70, 72, 74 is matched to the number of the protrusions 60, 62, 64. In this embodiment, the number of the protrusions 60, 62, 64 is three, so the number of the lip portions 70, 72, 74 is also three. The lip portions 70, 72, 74 are arranged in parallel along the insertion direction of the top cover 16 into the casing body 14 so as to be spaced apart from each other. All of the lip portions 70, 72, 74 abut against the inner wall 14a of the casing body 14.

[0024] The positions of the lips 70, 72, 74 correspond to the positions of the protrusions 60, 62, 64. That is, the base 54 is sandwiched between the lips 70, 72, 74 and the protrusions 60, 62, 64. The height positions of the lips 70, 72, 74 from the foot 56 are the same as the height positions of the protrusions 60, 62, 64 from the foot 56. In other words, the lips 70, 72, 74 and the protrusions 60, 62, 64 protrude in opposite directions at the same height positions based on the foot 56. The protrusions 60, 62, 64 or the inner peripheral surface 54a abut against the outer surface 36b of the rectangular frame portion 36. The lips 70, 72, 74 abut against the inner wall 14a of the casing body 14. This forms a seal between the outer surface 36b of the rectangular frame portion 36 of the top cover 16 and the inner wall 14a of the casing body 14. In this embodiment, the projections 60, 62, 64 protrude by approximately the same amount. The lip portions 70, 72, 74 also protrude by approximately the same amount. The lip portions 70, 72, 74 protrude by a larger amount than the projections 60, 62, 64.

[0025] The upper end of the base 54 is the end point of the insertion of the top cover 16 into the casing body 14. Hereinafter, this upper end is defined as a head, and the reference symbol for this head is 76. A protruding end 78 is provided on the outer peripheral surface 54b of the head 76 facing the inner wall 14a of the casing body 14. The protruding end 78 protrudes in an annular shape toward the inner wall 14a of the casing body 14. The protruding end 78 protrudes toward the casing body 14 further than the base 54. When the rectangular frame portion 36 is inserted into the casing body 14, the protruding amount of the protruding end 78 is greater than the protruding amounts of the lip portions 70, 72, and 74.

[0026] The amount of protrusion of the protruding end 78 is greatest at the insertion start side close to the base 54 and becomes smaller toward the insertion end side. Therefore, the protruding end 78 is inclined so as to move away from the casing main body 14 and approach the top cover 16 as it moves from the insertion start side to the insertion end side. In other words, the protruding end 78 becomes narrower as it moves away from the base 54.

[0027] The lower surface of the protruding end 78, which is the end surface on the insertion start side, is the widest. The lower surface may be slightly spaced from the upper edge surface of the casing body 14. The lower surface may abut against the upper edge surface of the casing body 14. In the illustrated example, the spaced state is shown. Also, the upper part of the protruding end 78 is connected to the upper surface of the head 76 as an inclined surface. The inclined surface does not abut against the head receiving portion 40. In other words, the head receiving portion 40 of the top cover 16 receives the head 76.

[0028] 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.

[0029] To provide the seal structure 50, for example, first, the seal material 52A is attached to the square frame portion 36 of the pre-assembled top cover 16, as shown in FIG. 4. In this case, for example, the head 76 of the seal material 52A is passed through the square frame portion 36. The head 76 abuts against the head receiving portion 40, blocking the seal material 52A. In addition, in this case, the foot portion 56 abuts against the lower end surface 36a of the square frame portion 36. If the inner diameter of the base portion 54 is sufficiently small, the base portion 54 tightens the square frame portion 36 by elastic action. As a result, the protrusions 60, 62, and 64 are crushed. If the amount of crushing of the protrusions 60, 62, and 64 is sufficiently large, the inner peripheral surface 54a of the base portion 54 abuts against the outer surface 36b of the square frame portion 36.

[0030] Next, the top cover 16 with the sealing material 52A attached to the square frame portion 36 is placed in a predetermined position. The predetermined position is a position in which the square frame portion 36 faces the upper opening 22 of the casing main body 14. The square frame portion 36 is then inserted into the upper opening 22. With this insertion, the sealing material 52A is sandwiched between the outer surface 36b of the square frame portion 36 and the inner wall 14a of the casing main body 14, as shown in FIG.

[0031] During insertion, the lip portions 70, 72, 74 are in sliding contact with the inner wall 14a of the casing body 14. Meanwhile, the outer peripheral surface 54b of the base 54 maintains a predetermined distance from the inner wall 14a of the casing body 14. This prevents the base 54 from being subjected to an excessive load due to sliding contact. This prevents the base 54 from rotating. This also prevents the base 54 from turning over (twisting). Since the thickness of the lip portions 70, 72, 74 along the axial direction of the battery pack 10 (the direction in which the top cover 16 is inserted) is sufficiently small, the frictional force between the lip portions 70, 72, 74 and the casing body 14 is small. Therefore, the top cover 16 to which the seal material 52A is attached can be easily inserted into the upper opening 22. For this reason, the work of attaching the top cover 16 to the casing body 14 becomes easy.

[0032] The seal material 52A has a protruding end 78 that protrudes toward the casing body 14 beyond the base 54. When the lip portions 70, 72, and 74 slide against the inner wall 14a of the casing body 14, a load acts on the seal material 52A from the insertion start side toward the insertion end side. It is assumed that the seal material 52A will stretch or move along the axial direction of the battery pack 10 due to this load. In such a case, the head 76 is blocked by the head receiving portion 40. Also, the load acting on the protruding end 78 is transmitted to the head receiving portion 40 via the head 76. That is, the head 76 reliably abuts against the head receiving portion 40. Therefore, the seal material 52A is prevented from stretching or moving to an extent that it will overcome the head receiving portion 40.

[0033] Moreover, the foot 56 of the seal 52A extends toward the lower end surface 36a of the rectangular frame 36 of the top cover 16. That is, the inner edge of the foot 56 covers the lower end surface 36a. Therefore, it is difficult for the foot 56 to come off the rectangular frame 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 52A is firmly positioned. As a result, even if the lip portions 70, 72, and 74 slide against the inner wall 14a of the casing body 14 when the top cover 16 is inserted into the upper opening 22, the seal 52A is prevented from being displaced due to the load. For the above reasons, the work of assembling the top cover 16 to the casing body 14 becomes smooth. In other words, the workability is improved.

[0034] The lower end surface of the foot portion 56, which is the end surface on the insertion start side of the sealing material 52A, abuts against the annular stopper wall 24. This completes the insertion of the top cover 16 into the upper opening 22. At this point, the lip portions 70, 72, 74 are crushed toward the base portion 54. The top cover 16 is attached to the casing body 14 by bolts (not shown). As the bolts are tightened, mainly the foot portion 56, the base portion 54, and the head portion 76 are crushed along the axial direction of the battery pack 10.

[0035] The battery pack 10 is housed in a battery storage section of an external load such as an electric vehicle or a generator, and supplies power to the external load. Here, the electric vehicle is particularly operated outdoors. It may rain during the operation. The battery storage section and the lid section that closes the battery storage section are sealed. However, if the sealing performance is deteriorated due to deterioration of the sealing material over time, rainwater or muddy water splashed up during operation may enter the battery storage section. In this case, there is a concern that the battery pack 10 (particularly the top cover 16) may become wet.

[0036] However, in this embodiment, the seal structure 50 is formed by sandwiching the seal material 52A having the above-mentioned shape between the top cover 16 and the casing body 14. As described above, this seal material 52A prevents the base 54 from rotating. Also, the base 54 is prevented from turning over. This ensures sealing performance, preventing rainwater, muddy water, and the like from entering between the top cover 16 and the casing body 14. Thus, the seal structure 50 according to this embodiment provides excellent sealing performance.

[0037] When the battery pack 10 supplies power to an external load, the temperature of the external load rises. For this reason, it is assumed that the battery storage section of the external load heats up, and as a result, the air inside the battery storage section expands. In this case, the expanded air may enter between the outer surface 36b of the rectangular frame section 36, which is a part of the top cover 16, and the inner wall 14a of the casing body 14. In this case, the lip section 74, which is located closest to the insertion end point among the lip sections 70, 72, and 74, is pressed by the expanded air.

[0038] When charging the battery pack 10 with a low remaining capacity, the single cells housed in the casing 18 become heated. When this heat is transferred to the gas (generally an inert gas) enclosed in the casing 18, the gas is expected to expand. In this case, when the expanded gas enters between the outer surface 36b of the rectangular frame portion 36 and the inner wall 14a of the casing body 14, the lip portion 70, which is located furthest from the insertion start side among the lip portions 70, 72, and 74, is pressed by the expanded gas.

[0039] For the reasons described above, the lip portions 70 and 74 may be deformed. However, in this embodiment, three lip portions 70, 72, and 74 are provided. Even if the lip portions 70 and 74 are deformed as described above, the lip portion 72 maintains its original shape. Therefore, the sealing performance is ensured by the lip portion 72. Therefore, as in the above, it is possible to prevent liquids such as rainwater or muddy water from entering the casing 18. The same applies when four or more lip portions are provided.

[0040] The present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

[0041] For example, in the top cover 16 shown in Figs. 1 to 4, the outer surface 36b of the rectangular frame portion 36 has a substantially linear shape extending along the axial direction of the battery pack 10. However, as shown in Fig. 5, the outer surface 36b of the rectangular frame portion 36 may be inclined so as to approach the casing main body 14 from the insertion start side toward the insertion end side. The top cover 16 is generally made of resin. By forming the outer surface 36b in such a shape, it becomes easy to remove the top cover 16 from the molding die after molding. That is, in this case, a so-called draft angle 80 is formed on the outer surface 36b.

[0042] In this case, it is preferable that the base 54 of the sealing material 52B is inclined along the outer surface 36b. The amount of protrusion of the lip portion 70 at the insertion start side where the base 54 is farthest from the casing body 14 is maximized. The amount of protrusion of the lip portion 74 at the insertion end side where the base 54 is closest to the casing body 14 is minimized. 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 14a of the casing body 14.

[0043] 6, the base 54 of the sealing material 52C may be linearly shaped along the insertion direction of the top cover 16 into the casing body 14. Specifically, the base 54 is linearly shaped extending along the inner wall 14a of the casing body 14. In this case, the protrusion amount of the protrusion 60 on the insertion start side is maximized, and the protrusion amount of the protrusion 64 on the insertion end side is minimized.

[0044] 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 is inclined so as to approach the rectangular frame portion 36 of the top cover 16 from the insertion start side (upper opening 22) of the casing body 14 into the top cover 16 toward the insertion end side (annular stopper wall 24).

[0045] When the seal material 52D is attached to the rectangular frame portion 36, it is not necessary to incline the base 54 of the seal material 52D. That is, the base 54 of the seal material 52D can be made linear along the outer surface 36b of the rectangular frame portion 36. In this case, the lip portion 70 on the insertion start side is closest to the casing body 14. The lip portion 74 on the insertion end side is farthest from the casing body 14. For this reason, the protruding amount of the lip portion 70 is minimized, and the protruding amount of the lip portion 74 is maximized. As in the above, the protruding amount of the lip portions 70, 72, 74 is determined so that the tip ends of the lip portions 70, 72, 74 abut against the inner wall 14a of the casing body 14.

[0046] Draft angles 80, 82 may be provided on both the outer surface 36b of the rectangular frame portion 36 and the inner wall 14a of the casing body 14. In this case, the protruding amount of each of the projections 60, 62, 64 and the protruding amount of each of the lip portions 70, 72, 74 are determined appropriately.

[0047] It is also possible to provide the protruding end 78 with a narrow upper surface that is interposed between the inclined surface and the head receiving portion 40 and that abuts against the head receiving portion 40 .

[0048] Furthermore, the present invention is not limited to application to the battery pack 10. The present invention can be adopted as a configuration for sealing between a first casing body and a second casing body in a general combination of the first casing body and the second casing body.

Claims

1. A seal structure (50) in which a seal 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, The sealing material 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, and a solid base (54) extending along the opening of the second casing body; at least one lip portion (70, 72, 74) projecting from the second outer surface of the base toward the inner wall of the second casing body; Equipped with the at least one lip portion abuts against the inner wall of the second casing body; the sealing material has a foot portion (56) on the insertion start side of the first casing body into the second casing body, the foot portion protrudes further toward the first casing body than the base portion, the first casing body receives the foot portion at an end surface on an insertion start side relative to the second casing body; 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 the same height position as the at least one lip portion provided on the second outer surface relative to the foot portion, and protrudes in the opposite direction to the at least one lip portion toward the outer wall of the first casing body.

2. 2. The seal structure according to claim 1, wherein the at least one lip portion has three or more lip portions, and the three or more lip portions are arranged in parallel along the insertion direction of the first casing body relative to the second casing body and are spaced apart from each other.

3. A sealing structure as described in claim 1 or 2, wherein the number of the at least one lip portion is the same as the number of the at least one protrusion, and all of the protrusions protrude in the opposite direction to the lip portion at the same height position as all of the lip portions, respectively.

4. 3. The seal structure according to claim 1, wherein the seal member has a head portion (76), the head portion is an end portion of the base portion on a side where the first casing body is inserted into the second casing body, A seal structure in which a head receiving portion (40) for blocking the head portion is formed protruding from the outer wall of the first casing body.

5. 5. The seal structure according to claim 4, wherein the seal has a protruding end (78), A sealing structure in which the protruding end portion is provided on a surface of the head portion facing the second casing body and protrudes further toward the second casing body than the base portion.

6. A sealing structure according to any one of claims 1 to 5, wherein the outer wall of the first casing body is inclined so as to approach the second casing body as it moves from the insertion start side toward the insertion end side of the second casing body.

7. 7. The sealing structure according to claim 6, wherein the sealing material is attached to the first casing body, the base of the sealing material is inclined along the outer wall of the first casing body, and the amount of protrusion of the at least one lip portion into the second casing body is large at the insertion start side of the first casing body into the second casing body and small at the insertion end side.

8. A sealing structure as described in claim 6, wherein the sealing material is attached to the first casing body, the base of the sealing material extends linearly along the insertion direction of the first casing body into the second casing body, and the amount of protrusion of the protrusion into the first casing body is large at the insertion start side of the first casing body into the second casing body and small at the insertion end side.

9. A sealing structure according to any one of claims 1 to 8, wherein the inner wall of the second casing body is inclined so as to approach the first casing body as it moves from the insertion start side toward the insertion end side of the first casing body.

10. 10. The sealing structure according to claim 9, 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 into the second casing body is greater at the insertion start side of the first casing body into the second casing body and smaller at the insertion end side.

Images