WO2017168724A1

WO2017168724A1 - Waterproof case

Info

Publication number: WO2017168724A1
Application number: PCT/JP2016/060819
Authority: WO
Inventors: 明彦山下
Original assignee: 本田技研工業株式会社
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2017-10-05
Also published as: JPWO2017168724A1

Abstract

Provided is a waterproof case of which the waterproof performance is enhanced by use of an engagement structure between a base and a case, and a fixation structure for fixing the waterproof case to a fixing object, in conjunction with each other. The waterproof case includes: a base 30 supporting a Hall IC 36; a case 10 provided with a bottomed cylindrical portion 16 in which the Hall IC 36 is housed; and O-rings 80, 82 interposed between the base 30 and the case 10. A base-side flange 32 having a base-side through hole 31 provided therein is formed on the base 30, and a case-side flange 12 having a case-side through hole 11 provided therein is formed on the case 10. The base 30 and the case 10 are configured to be temporarily assembled together in a state where the base-side flange 32 and the case-side flange 12 are held so as to have a prescribed positional relationship by means of an engagement portion 13 and a portion 39 to be engaged. When a fastening member 50 passing through the base-side through hole 31 and the case-side through hole 11 is screwed into a transmission case 60, the base 30 and the case 10 are jointly fastened and fixed to the transmission case 60.

Description

Waterproof case

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a waterproof case, and more particularly to a waterproof case for preventing the stored electronic components from touching moisture.

A waterproof case is conventionally known for protecting internal components from moisture when the internal components such as Hall ICs are used in an environment where the components may be exposed to moisture.

In Patent Document 1, an O-ring is disposed between a base supporting an internal part and a case covering an electronic part, and an engagement structure including an engagement claw and an engagement hole between the base and the case. A waterproof case is disclosed in which the waterproof performance is enhanced by providing an engagement claw covering the gap between the base and the case.

JP, 2015-31519, A

However, in the waterproof case disclosed in Patent Document 1, the engagement structure between the base and the case and the fixing structure for fixing the waterproof case to the fixing target function separately and independently. It has not been considered to further improve the waterproof performance by combining the fixing structure and the engaging structure.

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of the prior art described above and to achieve waterproof performance by making the engagement structure between the base and the case cooperate with the fixing structure for fixing the waterproof case to the fixed object. It is in providing a waterproof case which was made to raise.

In order to achieve the above object, the present invention provides a case (10) provided with a base (30) for supporting an internal part (36) and a bottomed cylindrical portion (16) for housing the internal part (36). A waterproof case (1) having a sealing means (80, 82, 80a, 80b, 82c, 82d, 82e, 80f, 80g) interposed between the base (30) and the case (10); The base (30) is formed with a base side flange (32) provided with at least one base side through hole (31) for passing at least one fastening member (50), and the case (10) A case side flange (12) provided with at least one case side through hole (11) for passing the fastening member (50) is formed, and the base side through hole (31) and the case side through hole are formed. By screwing the fastening member (50) passing through the hole (11) to the fixed object (60), the base (30) and the case (10) are fastened together to the fixed object (60). The point has the first feature.

Further, the base (30) and the case (10) mutually define the base side flange (32) and the case side flange (12) by the engaging portion (13) and the engaged portion (39). A second feature resides in that temporary assembly can be performed while being held in the positional relationship of

In addition, column projections (33, 33a, 33b, 33g) are provided on the base (30, 30a, 30b, 30g), and the sealing means (80, 80a, 80b, 80g) are the column projections (33). , 33a, 33b, 33g), and is an annular member in contact with the inner surface of the bottomed cylindrical portion (16, 16a, 16b, 16g).

In addition, a pillar projection (33) is provided on the base (30), and the sealing means (80, 82) is supported by the pillar projection (33) to form an inner surface of the bottomed cylindrical portion (16). A fourth feature resides in that the annular member (80) to be in contact and the annular member (82) disposed between the base side flange (32) and the case side flange (12).

Further, inclined surfaces (21a, 21b) formed by decreasing the inner diameter toward the bottom of the bottomed cylindrical portion (16a, 16b) are provided on the inner surface of the bottomed cylindrical portion (16a, 16b) A fifth of the sealing means (80a, 80b) is in contact with the inclined surface (21a, 21b) by temporarily assembling the base (30a, 30b) and the case (10a, 10b). There is a feature.

Further, an inclined surface (21g) formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion (16g) is provided on the inner surface of the bottomed cylindrical portion (16g), and the sealing is performed A means (80g) contacts the cylindrical inner surface (90) of the bottomed cylindrical portion (16g) and temporarily assembles the base (30g) and the case (10g) to the inclined surface (21g). There is a sixth feature in the contact point.

Also, the sealing means (82, 82c, 82d) is an annular member disposed between the base side flange (32, 32c, 32d) and the case side flange (12, 12c, 12d) Has the seventh feature.

An eighth feature is that the sealing means (82d) is a triangular cross-sectional member in contact with the edge of the opening (18d) of the bottomed cylindrical portion (16d).

A ninth feature is that the sealing means (82e) is an L-shaped cross-sectional member in contact with the edge of the opening (18e) of the bottomed cylindrical portion (16e).

According to the first feature, the base (30) is formed with a base side flange (32) provided with at least one base side through hole (31) for passing at least one fastening member (50). A case side flange (12) provided with at least one case side through hole (11) for passing the fastening member (50) is formed in the case (10), and the base side through hole (31) The base (30) and the case (10) are fixed to the fixed object (60) by screwing a fastening member (50) passing through the case side through hole (11) to the fixed object (60). Since they are fastened together, it is possible to obtain a waterproof case in which the waterproof performance is enhanced by fastening the base and the case together with the fastening object by fastening means.

According to a second feature, the base (30) and the case (10) are formed by the engaging portion (13) and the engaged portion (39), the base side flange (32) and the case side flange ( 12) being held in a predetermined positional relationship with each other, it is possible to achieve a certain degree of waterproof performance by temporarily assembling the base and the case by the engaging portion and the engaged portion. As a result, by co-clamping the fastening object with the fastening object, it is possible to obtain a waterproof case having further enhanced waterproof performance. In addition, since a certain degree of waterproof performance can be obtained by the temporary assembly, handling before fastening and fixing to the object to be fixed becomes easy, and the assembly process can be simplified.

According to a third feature, the base (30, 30a, 30b, 30g) is provided with a column projection (33, 33a, 33b, 33g), and the sealing means (80, 80a, 80b, 80g) is Since the annular member is supported by the column projections (33, 33a, 33b, 33g) and is in contact with the inner surface of the bottomed cylindrical portion (16, 16a, 16b, 16g), waterproof performance is provided on the inner surface of the bottomed cylindrical portion You can get a waterproof case to demonstrate.

According to a fourth feature, the base (30) is provided with a pillar projection (33), and the sealing means (80, 82) is supported by the pillar projection (33) to form the bottomed cylindrical portion Since the annular member (80) in contact with the inner surface of (16) and the annular member (82) disposed between the base side flange (32) and the case side flange (12), the base and the case When temporary assembly is performed, the waterproof performance by the sealing means is exhibited to a certain extent, and a waterproof case can be obtained in which the waterproof performance is further enhanced by fixing the object to be fixed together by the fastening means.

According to the fifth feature, the inclined surface (the inner surface of the bottomed cylindrical portion (16a, 16b) is formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion (16a, 16b) 21a, 21b) are provided, and the sealing means (80a, 80b) temporarily assembles the base (30a, 30b) and the case (10a, 10b) to the inclined surface (21a, 21b) Since the base and the case are temporarily assembled, the waterproof performance by the sealing means is exhibited to a certain extent, and the sealing means is further pressed against the inclined surface by fastening and fixing to the object to be fixed by the fastening means. A waterproof case with enhanced performance can be obtained.

According to the sixth feature, the inner surface of the bottomed cylindrical portion (16g) is provided with an inclined surface (21g) formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion (16g) And the sealing means (80 g) contacts the cylindrical inner surface (90) of the bottomed cylindrical portion (16 g) and temporarily assembles the base (30 g) and the case (10 g). Since it contacts the inclined surface (21g), it provides a certain degree of waterproofing performance before engaging the engaging part with the engaged part for temporary assembly, and by combining temporarily, waterproofing performance on the inclined surface part is achieved In addition, by co-clamping and fixing the object to be fixed, a waterproof case can be obtained in which the waterproof performance at the inclined surface portion is enhanced.

According to a seventh aspect, the sealing means (82, 82c, 82d) is disposed between the base side flange (32, 32c, 32d) and the case side flange (12, 12c, 12d) Since it is an annular member, it is possible to obtain a waterproof case that exhibits waterproof performance between the base side flange and the case side flange.

According to the eighth feature, since the sealing means (82d) is a triangular cross-sectional member in contact with the edge of the opening (18d) of the bottomed cylindrical portion (16d), the base and the case are temporarily assembled. Can provide waterproof performance at the opening of the bottomed cylindrical portion, and obtain a waterproof case in which the waterproof performance is further enhanced by the wedge function by co-clamping and fixing to a fixed object by fastening means. Can.

According to the ninth feature, since the sealing means (82e) is an L-shaped cross-sectional member in contact with the edge of the opening (18e) of the bottomed cylindrical portion (16e), the base and the case are temporarily assembled Thus, the waterproof performance can be exhibited at the opening of the bottomed cylindrical portion, and the waterproof case can be further enhanced by co-clamping and fixing to the fixed object by the fastening means. .

It is a side view of a waterproof case concerning one embodiment of the present invention. It is a front view of a waterproof case. It is a rear view of a waterproof case. It is a side view which shows the state which decomposed | disassembled the waterproof case. It is a perspective view which shows the state which decomposed | disassembled the waterproof case. FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 3; It is sectional drawing which shows the state which isolate | separated the base and the case from the state of FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. It is sectional drawing which shows the structure of the waterproof case which concerns on 2nd Embodiment of this invention. It is a sectional view showing the composition of the waterproof case concerning a 3rd embodiment of the present invention. It is sectional drawing which shows the structure of the waterproof case which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the structure of the waterproof case which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the structure of the waterproof case which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the structure of the waterproof case which concerns on 7th Embodiment of this invention. It is sectional drawing which shows the structure of the waterproof case which concerns on 8th Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a waterproof case 1 according to an embodiment of the present invention. 2 is a front view of the waterproof case 1 and FIG. 3 is a rear view of the waterproof case 1. The waterproof case 1 according to the present embodiment is a through hole formed in the transmission case in order to detect the vehicle speed of the vehicle with a Hall IC (see FIGS. 3 and 4) as an internal part housed in the bottomed cylindrical portion 16. The bottomed cylindrical portion 16 is inserted into the housing and fixed to the transmission case by a bolt 50 as a fastening member.

The waterproof case 1 comprises a case 10 having a columnar support portion 14 for supporting the bottomed cylindrical portion 16 and a base having a male connector 41 for supporting the Hall IC and connecting to the harness. The support portion 14 is provided with a rubber O-ring (O-ring) 15 having a waterproof and dustproof function with the transmission case. The base 30 is formed with a flange case 40 used for fixing the temporary assembly with the case 10 and the transmission case. The bolt 50 is screwed into the screw hole of the transmission case through the case side through hole 11 formed in the case side flange 12 of the case 10 and the base side through hole 31 formed in the base side flange 32 of the base 30. Be done. The base 30 and the case 10 can each be formed of a hard resin or the like.

FIG. 4 is a side view showing the waterproof case 1 in a disassembled state. FIG. 5 is a perspective view of the same. The base 30 is provided with a column protrusion 33 supported by the base side flange 32, and a first O-ring 80 as a sealing means is disposed on the outer surface of the column protrusion 33. A hole IC 36, a permanent magnet 42 for applying a bias magnetic field to the hole IC 36, and a holder 37 for supporting a substrate 35 for mounting a plurality of electronic components are provided at the end of the column protrusion 33. Further, a bus bar 34 connecting the substrate 35 and a terminal in the connector 41 is inserted through the end face of the pillar projection 33. In the side wall of the flange base 40 erected from the peripheral portion of the base side flange 32, two engaged parts 39 which are square through holes are formed on one side.

On the other hand, at the end of the support portion 14 of the case 10, there is provided a case-side flange 12 in which two claw-like engagement portions 13 are formed on each side. Then, when the holder 37 supporting the Hall IC 36 is inserted into the bottomed cylindrical portion 16, the case side flange 12 is accommodated in the flange base 40, and the time when the engaging portion 13 engages with the engaged portion 39 Then, the temporary assembly of the case 10 and the base 30 is completed. At this time, the case side flange 12 and the base side flange 32 are held in a predetermined positional relationship to be in close contact with each other, and the case side through hole 11 and the base side through hole 31 communicate with each other.

6 is a cross-sectional view taken along the line VI-VI of FIG. 7 is a cross-sectional view showing a state in which the base 30 and the case 10 are separated from the state of FIG. Further, FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. The substrate 35 and the Hall IC 36 are connected by the wiring 44. The permanent magnet 42 is disposed adjacent to the substrate 35, and the bus bar 34 connected to the substrate 35 is connected to the terminal 43 in the connector 41. The waterproof case 1 is fixed by a bolt 50 to a transmission case 60 as an object to be fixed.

As described above, the column protrusion 33 of the base 30 is provided with the first O-ring 80 housed in the storage groove 81 having a substantially U-shaped cross section. Further, at the end face of the case-side flange 12 of the case 10, a second O-ring 82 housed in a storage groove 83 of substantially U-shaped cross section is provided.

Then, when the holder 37 of the base 30 is inserted into the opening 18 of the case 10 and the engaging portion 13 of the case side flange 12 is engaged with the engaged portion 39 of the base side flange 32, The base side flange 32 and the case side flange 12 are in close contact with each other, and the Hall IC 36 is disposed close to the bottom portion 20 of the bottomed cylindrical portion 16.

At this time, the first O-ring 80 exhibits a certain degree of waterproof performance between the inner surface 21 of the case 10 and the second O-ring 82 exhibits a certain degree of waterproof performance between the base side flange 12 and the case side flange 32. doing. Then, when the bolt 50 is screwed into the bolt hole 62 of the transmission case 60 through the base side through hole 31 and the case side through hole 11, the base 30 and the case 10 are tightened together with the transmission case 60. The waterproof performance by the ring 80 and the second O-ring 82 is further enhanced.

As a result, a degree of waterproofing performance that is temporary assembly can be obtained, so that handling before fastening and fixing to a fixed object becomes easy, and the assembly process can be simplified.

In the present embodiment, although the insertion groove 61 into which the side wall end face of the base flange 40 is inserted is formed in the transmission case 60, the insertion groove 61 may be eliminated by reducing the height of the side wall end face. You may configure it.

The structures of the

waterproof cases

1a, 1b, 1c, 1d, 1e, 1f and 1g according to the second to eighth embodiments of the present invention will be described below with reference to FIGS. In any of the embodiments, the waterproof performance is obtained by setting the base and the case in a temporary assembled state, and by tightening the base and the case together with the transmission case 60 with the bolt 50, the waterproof performance is further enhanced. The effect of being

FIG. 9 is a cross-sectional view showing the structure of a waterproof case 1a according to a second embodiment of the present invention. In the present embodiment, the inner surface of the bottomed cylindrical portion 16a of the waterproof case 1a is provided with an inclined surface 21a formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion 16a. The Hall IC 36 is supported by a holder 37a extending from the pillar projection 33a. The O-ring 80a provided on the pillar projection 33a is configured to be in contact with the inclined surface 21a by temporarily assembling the base 30a and the case 10a. Thereby, when the base and the case are temporarily assembled, the waterproof performance by the sealing means is exhibited to some extent, and the O-ring 80a is further pressed against the inclined surface 21a by fastening and fixing to the transmission case 60 with the bolt 50. Thus, a waterproof case 1a can be obtained, in which the waterproof performance is enhanced.

FIG. 10 is a cross-sectional view showing a configuration of a waterproof case 1b according to a third embodiment of the present invention. In the present embodiment, the inner surface of the bottomed cylindrical portion 16b of the waterproof case 1b is provided with an inclined surface 21b formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion 16b. Then, a rubber annular cap 80b engaged with the end of the column projection 33b is configured to be in contact with the inclined surface 21b by temporarily assembling the base 30b and the case 10b. Thereby, when the base and the case are temporarily assembled, the waterproof performance by the sealing means is exhibited to a certain extent, and the annular cap 80b is further pressed against the inclined surface 21b by fastening and fixing the transmission case 60 together with the bolt 50. Thus, a waterproof case 1b can be obtained, which is enhanced in waterproof performance.

FIG. 11 is a cross-sectional view showing a configuration of a waterproof case 1c according to a fourth embodiment of the present invention. In the present embodiment, an O-ring 82c is provided between the case-side flange 12c of the waterproof case 1c and the base-side flange 32c. Thereby, when the base and the case are temporarily assembled, the waterproof performance by the sealing means is exhibited to a certain extent, and the O-ring 82c is further pressed by fastening and fixing the transmission case 60 together with the bolt 50 Can be obtained waterproof case 1c.

FIG. 12 is a cross-sectional view showing a configuration of a waterproof case 1 d according to a fifth embodiment of the present invention. In the present embodiment, the base-side flange 32d is provided with sealing means 82d in contact with the edge of the opening 18d of the bottomed cylindrical portion 16d. The sealing means 82d is an annular member having a so-called wedge-shaped triangular cross section, and by temporarily assembling the base and the case, a certain degree of waterproof performance can be exhibited at the opening 18d of the bottomed cylindrical portion 16d. By co-clamping and fixing the transmission case 60 by 50, it is possible to obtain a waterproof case 1d in which the waterproof function is further enhanced by the wedge function.

FIG. 13 is a cross-sectional view showing a configuration of a waterproof case 1e according to a sixth embodiment of the present invention. In the present embodiment, the base side flange 32e is provided with sealing means 82e in contact with the edge of the opening 18e of the bottomed cylindrical portion 16e. The sealing means 82e is an annular member having a so-called L-shaped cross section, and by temporarily assembling the base and the case, a certain degree of waterproof performance can be exhibited at the opening 18e of the bottomed cylindrical portion 16e. By fastening the transmission case 60 together, it is possible to obtain a waterproof case 1 e in which the waterproof performance is further enhanced.

FIG. 14 is a cross-sectional view showing a configuration of a waterproof case 1f according to a seventh embodiment of the present invention. In the present embodiment, an O-ring 80f is provided between the pillar projection 33f of the waterproof case 1f and the step provided on the bottomed cylindrical portion 16f. As a result, when the base and the case are temporarily assembled, a certain level of waterproof performance can be exhibited at the stepped portion, and the waterproof performance is further enhanced by fastening and fixing to the transmission case 60 with the bolt 50 A waterproof case 1f can be obtained.

FIG. 15 is a cross-sectional view showing a configuration of a waterproof case 1g according to an eighth embodiment of the present invention. In the present embodiment, an inclined surface 21g formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion 16g is provided on the inner surface of the bottomed cylindrical portion 16g of the waterproof case 1g. The O-ring 80f provided on the column projection 33f is in contact with the inner surface 90 of the case 33g when the column projection 33f is inserted into the case 33g, and further, an inclined surface is obtained by temporarily assembling the base 30g and the case 10g. It is configured to touch 21 g. Thereby, when the base and the case are temporarily assembled, the waterproof performance by the sealing means is exhibited to a certain extent, and the O-ring 80f is further pressed against the inclined surface 21f by fastening and fixing the transmission case 60 together with the bolt 50. Thus, it is possible to obtain a waterproof case 1f in which the waterproof performance is enhanced.

Note that the installation position of the waterproof case, the type and shape of the fixed object, the shape and material of the case and the base, the shape of the case side flange and the base side flange, the shape and structure of the engaging portion and the engaged portion The size, the cross-sectional shape, and the like are not limited to the above embodiment, and various modifications are possible. For example, in the embodiment described above, at least one of the sealing means disposed between the outer surface of the base and the inner surface of the case, and the sealing means disposed between the base side flange and the case side flange It can be set as the structure provided with both. Further, although the bottomed cylindrical portion and the column projection are shown as a circular cross section in the above embodiment, a bottomed square cylindrical portion or a prismatic projection having a square cross section may be used. Furthermore, a plurality of through holes may be provided in the flange so as to be fastened together with a plurality of bolts.

DESCRIPTION OF SYMBOLS 1 ... Waterproof case, 10 ... Case, 11 ... Case side through hole, 12 ... Case side flange, 13 ... Engaging part, 16 ... Bottomed cylindrical part, 30 ... Base, 31 ... Base side through hole, 32 ... Base side Flange 33 33 post projection 36 Hall IC (internal parts) 39 engaged portion 50 bolt (fastening member) 60 transmission case (fixed object) 80 first O-ring (sealing means , 82 ... second O-ring (sealing means), 80a, 80b, 82c, 82d, 82e, 80f, 80g ... sealing means

Claims

A case (10) provided with a base (30) for supporting an internal part (36) and a bottomed cylindrical portion (16) for housing the internal part (36), the base (30) and the case (10) A waterproof case (1) having sealing means (80, 82, 80a, 80b, 82c, 82d, 82e, 80f, 80g) interposed between
The base (30) is formed with a base side flange (32) provided with at least one base side through hole (31) for passing at least one fastening member (50);
The case (10) is formed with a case side flange (12) provided with at least one case side through hole (11) for passing the fastening member (50),
By screwing the fastening member (50) passing through the base side through hole (31) and the case side through hole (11) to the fixed object (60), the base (30) and the case (10) A waterproof case characterized in that the object to be fixed (60) is fastened together.
The base (30) and the case (10) are at predetermined positions relative to the base side flange (32) and the case side flange (12) by the engaging portion (13) and the engaged portion (39). The waterproof case according to claim 1, wherein the waterproof case is configured to be temporarily assembled in a state of being held in a relationship.
Column projections (33, 33a, 33b, 33g) are provided on the base (30, 30a, 30b, 30g),
The annular member (80, 80a, 80b, 80g) is an annular member supported by the column projection (33, 33a, 33b, 33g) and in contact with the inner surface of the bottomed cylindrical portion (16, 16a, 16b, 16g) The waterproof case according to claim 1 or 2, characterized in that
A pillar projection (33) is provided on the base (30),
An annular member (80) supported by the column projection (33) and in contact with the inner surface of the bottomed cylindrical portion (16) by the sealing means (80, 82), the base side flange (32) and the case The waterproof case according to claim 1 or 2, which is an annular member (82) disposed between the side flange (12).
An inclined surface (21a, 21b) formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion (16a, 16b) is provided on the inner surface of the bottomed cylindrical portion (16a, 16b) Yes,
The sealing means (80a, 80b) is in contact with the inclined surface (21a, 21b) by temporarily assembling the base (30a, 30b) and the case (10a, 10b). The waterproof case described in 2.
The inner surface of the bottomed cylindrical portion (16g) is provided with an inclined surface (21g) formed by reducing the inner diameter toward the bottom of the bottomed cylindrical portion (16g),
The sealing means (80 g) is in contact with the cylindrical inner surface (90) of the bottomed cylindrical portion (16 g) and the inclined surface (21 g) by temporarily assembling the base (30 g) and the case (10 g) The waterproof case according to claim 1, wherein the waterproof case is in contact with.
The sealing means (82, 82c, 82d) is an annular member disposed between the base side flange (32, 32c, 32d) and the case side flange (12, 12c, 12d) The waterproof case according to claim 1 or 2.
The waterproof case according to claim 1 or 2, wherein the sealing means (82d) is a triangular cross-sectional member in contact with the edge of the opening (18d) of the bottomed cylindrical portion (16d).
The waterproof case according to claim 1 or 2, wherein the sealing means (82e) is an L-shaped cross-sectional member in contact with the edge of the opening (18e) of the bottomed cylindrical portion (16e).