JP6360351B2

JP6360351B2 - Waterproof stopper

Info

Publication number: JP6360351B2
Application number: JP2014104469A
Authority: JP
Inventors: 光司工藤
Original assignee: Yazaki Corp
Current assignee: Yazaki Corp
Priority date: 2014-05-20
Filing date: 2014-05-20
Publication date: 2018-07-18
Anticipated expiration: 2034-05-20
Also published as: JP2015220171A

Description

本発明は、ハウジングにおける収容部の内面に接するハウジングシール部と、電線の外面に接する電線シール部とを有する防水栓に関する。 The present invention relates to a waterproof plug having a housing seal portion in contact with an inner surface of a housing portion in a housing and an electric wire seal portion in contact with an outer surface of an electric wire.

複数本の電線からなるワイヤハーネスの端末にコネクタが設けられ、このコネクタに防水性能を持たせるために防水栓が用いられる（具体的には、ハウジングと電線との間の防水性能確保に用いられる）。 A connector is provided at the end of a wire harness composed of a plurality of electric wires, and a waterproof plug is used to provide the connector with waterproof performance (specifically, it is used to ensure waterproof performance between the housing and the electric wire). ).

図６において、例えば下記特許文献１に開示された防水栓１は、所謂ゴム栓であって、ハウジングにおける収容部２の内面３に接するハウジングシール部４と、電線５の外面６に接する電線シール部７と、ハウジングシール部４に連続して収容部２の開口端８から外側に延出する外筒部９と、電線シール部７に連続して開口端８から外側に延出する内筒部１０と、外筒部９及び内筒部１０の間に形成される溝部１１と、内筒部１０の反対側に配置形成される先端筒部１２とを有する。 In FIG. 6, for example, the waterproof plug 1 disclosed in Patent Document 1 below is a so-called rubber plug, and includes a housing seal portion 4 that contacts the inner surface 3 of the housing portion 2 and a wire seal that contacts the outer surface 6 of the electric wire 5. Part 7, an outer cylinder part 9 extending outward from the opening end 8 of the housing part 2 continuously to the housing seal part 4, and an inner cylinder extending outward from the opening end 8 to the electric wire seal part 7 Part 10, a groove part 11 formed between outer cylinder part 9 and inner cylinder part 10, and tip cylinder part 12 arranged and formed on the opposite side of inner cylinder part 10.

ハウジングシール部４には、二つのリップ部１３が形成される。このようなハウジングシール部４に連続する外筒部６は、外側に向けて徐々に拡大する形状に形成され、基端部１４が収容部２の開口端８に圧接する。一方、電線シール部７には、三つの小さなリップ部１５が形成される。三つの小さなリップ部１５は、ハウジングシール部４の二つのリップ部１３に対し電線軸方向に位置をずらして配置形成される。尚、内筒部１０は、外筒部６に比べ薄肉に形成される。 Two lip portions 13 are formed in the housing seal portion 4. The outer cylinder portion 6 continuing to the housing seal portion 4 is formed in a shape that gradually expands outward, and the base end portion 14 is in pressure contact with the open end 8 of the housing portion 2. On the other hand, the wire seal portion 7 is formed with three small lip portions 15. The three small lip portions 15 are formed so as to be displaced in the electric wire axial direction with respect to the two lip portions 13 of the housing seal portion 4. The inner cylinder portion 10 is formed thinner than the outer cylinder portion 6.

特開平７−１４２１１８号公報JP-A-7-142118

ところで、上記従来の防水栓１にあっては、使用時に次のような問題点を有する。すなわち、溝部１１が図示の如く溝状に存在する形状であることから、収容部２における開口端８の位置での反発力（弾力）が小さくなってしまい、この小さな反発力の状態で更に電線５が塑性変形によって細くなってしまった場合には（塑性変形によって被覆が薄くなり電線外径が小さくなった場合には）、十分な防水性能の確保が困難であるという問題点を有する。また、上記の状態で電線５を屈曲させた場合には、防水栓１の追従性が悪くなるのは勿論であることから、上記同様に防水性能の確保が困難であるという問題点を有する。 By the way, the conventional waterproof plug 1 has the following problems when used. That is, since the groove portion 11 has a groove-like shape as shown in the figure, the repulsive force (elasticity) at the position of the opening end 8 in the accommodating portion 2 becomes small, and the electric wire is further reduced in this small repulsive force state. When 5 becomes thin due to plastic deformation (when the coating becomes thin and the outer diameter of the electric wire decreases due to plastic deformation), there is a problem that it is difficult to ensure sufficient waterproof performance. Further, when the electric wire 5 is bent in the above state, the followability of the waterproof plug 1 is of course deteriorated, and thus there is a problem that it is difficult to ensure waterproof performance as described above.

また、上記従来の防水栓１にあっては、収容部２の開口端８から外側に延出する部分を有することから、収容部２に対する挿入方向性が存在する形状であり、そのため作業性に影響を来してしまうという問題点や、延出部分を保護するための保護部品をコネクタに追加しなければならないという問題点、さらには、延出部分があることから、過度に電線５を屈曲させた場合に防水栓１が外側に飛び出してしまうという問題点、そのため飛び出し防止部品をコネクタに追加しなければならないという問題点など、様々な問題点を有する。 Moreover, in the said conventional waterproof plug 1, since it has the part extended outside from the opening end 8 of the accommodating part 2, it is a shape in which the insertion directionality with respect to the accommodating part 2 exists, Therefore For workability | operativity The problem of causing an influence, the problem that a protective part for protecting the extension part must be added to the connector, and the extension part, which causes the wire 5 to be bent excessively In this case, there are various problems such as a problem that the waterproof plug 1 jumps out to the outside, and a problem that a pop-out prevention part must be added to the connector.

尚、上記従来の防水栓１に限らないが、防水栓を収容部に挿入する際に、挿入先端側の部分が捲れあがらない形状（裏返らない形状）であることが好ましいのは勿論である。 Although not limited to the above-described conventional waterproof plug 1, it is of course preferable that the insertion distal end side portion has a shape that does not roll up (a shape that does not turn over) when the waterproof plug is inserted into the housing portion. .

本発明は、上記した事情に鑑みてなされたもので、防水性能の向上を図ることが可能な防水栓を提供することを課題とする。 This invention is made | formed in view of an above-described situation, and makes it a subject to provide the waterproof stopper which can aim at the improvement of waterproof performance.

上記課題を解決するためになされた請求項１に記載の本発明は、ハウジングにおける収容部の内面に接するハウジングシール部と、電線の外面に接する電線シール部とを有して、前記ハウジングと前記電線との間の防水性能確保に用いられる防水栓において、当該防水栓は、前記収容部の開口端側に防水栓第一端部を有するとともに該防水栓第一端部の反対側に防水栓第二端部を有して全体が前記収容部内に挿入されるものであり、前記ハウジングシール部の前記防水栓第一端部側には、断面視山形状の外側第一リップ部が形成され、該外側第一リップ部と前記電線シール部との間には、潰れ変形可能な第一撓み空間が形成され、該第一撓み空間は、前記防水栓第一端部を開口して形成され且つ前記外側第一リップ部の頂部から電線軸に向けて垂直に引いた垂直線上又は該垂直線の近傍までの深さに形成されるとともに、前記第一撓み空間は、前記防水栓第一端部を前記電線軸に沿って凹ませ且つ該凹みを環状にした環状溝部により形成され、該環状溝部は、前記外側第一リップ部が前記垂直線に沿って弾性変形した際に、前記第一撓み空間を形成する面同士が全周にわたり接する形状に形成され、前記ハウジングシール部の前記防水栓第二端部側には、前記外側第一リップ部と同じ形状になる外側第二リップ部が形成され、前記電線軸の方向に沿った前記外側第一リップ部と前記外側第二リップ部との間には、外側第三リップ部が一又は複数配置形成され、該外側第三リップ部は、前記外側第一リップ部及び前記外側第二リップ部よりも頂部が低くなる断面視山形状に形成されることを特徴とする。
The present invention according to claim 1, which has been made to solve the above-described problem, includes a housing seal portion that is in contact with the inner surface of the housing portion in the housing, and an electric wire seal portion that is in contact with the outer surface of the electric wire. In the waterproof plug used to ensure waterproof performance between the electric wire and the waterproof plug, the waterproof plug has a waterproof plug first end portion on the opening end side of the housing portion and a waterproof plug on the opposite side of the waterproof plug first end portion. The whole has a second end portion and is inserted into the housing portion, and an outer first lip portion having a mountain shape in cross section is formed on the waterproof plug first end portion side of the housing seal portion. A first deformation space that can be crushed and deformed is formed between the outer first lip portion and the wire seal portion, and the first bending space is formed by opening the first end portion of the waterproof plug. And from the top of the outer first lip toward the wire shaft Is formed in a depth to the vicinity of the vertical line or the hanging straight line drawn vertically, said first flexure space, and concave acquire annular recessed along the waterproof plug first end to the wire axis The annular groove is formed into a shape in which the surfaces forming the first bending space are in contact with each other when the outer first lip is elastically deformed along the vertical line. An outer second lip portion having the same shape as the outer first lip portion is formed on the waterproof plug second end side of the housing seal portion, and the outer first lip along the direction of the electric wire shaft is formed. One or a plurality of outer third lip portions are formed between the lip portion and the outer second lip portion, and the outer third lip portion is formed by the outer first lip portion and the outer second lip portion. top is formed in the cross-sectional Miyama shape drops And wherein the door.

請求項２に記載の本発明は、請求項１に記載の防水栓において、前記環状溝部は、溝底が前記垂直線よりも奥に位置する形状に形成されることを特徴とする。
The present invention described in claim 2 is the waterproof plug according to claim 1, wherein the annular groove is being formed in a shape groove bottom is located deeper than the vertical line.

請求項３に記載の本発明は、請求項２に記載の防水栓において、前記環状溝部は、前記外側第一リップ部と前記電線シール部との間における前記垂直線の中央位置に合わせて配置形成されることを特徴とする。
According to a third aspect of the present invention, in the waterproof plug according to the second aspect, the annular groove portion is arranged in accordance with a center position of the vertical line between the outer first lip portion and the electric wire seal portion. It is formed.

請求項４に記載の本発明は、請求項１に記載の防水栓において、前記環状溝部は、断面視すり鉢形状に形成されることを特徴とする。
The present invention described in claim 4 is the waterproof plug according to claim 1, wherein the annular groove is being formed in the cross section mortar shape.

請求項５に記載の本発明は、請求項１、２、３又は４に記載の防水栓において、前記外側第二リップ部と前記電線シール部との間には、前記第一撓み空間と同じになる第二撓み空間が形成されることを特徴とする。
The present invention according to claim 5, claim 1, in a waterproof plug according 3 or 4, between the front Kigai side second lip portion and the electric wire seal part, the first deflection A second bending space that is the same as the space is formed.

請求項６に記載の本発明は、請求項１に記載の防水栓において、前記電線シール部には、前記外側第一リップ部、前記外側第二リップ部、及び前記外側第三リップ部と同じ形状になる内側第一リップ部、内側第二リップ部、及び内側第三リップ部が形成されることを特徴とする。
The present invention described in claim 6 is the waterproof plug according to claim 1, the electric wire seal part, said outer first lip portion, said outer second lip, and the same as the outer third lip An inner first lip portion, an inner second lip portion, and an inner third lip portion are formed.

以上のような特徴を有する本発明によれば、ハウジングにおける収容部内に防水栓の全体が挿入される。すなわち、本発明は、収容部の開口端から外側に防水栓の一部分が延出するものでない。また、本発明によれば、第一撓み空間を有する防水栓であり、電線が仮に塑性変形によって細くなったとしても（塑性変形によって被覆が薄くなり電線外径が小さくなったとしても）、その細さに応じるように第一撓み空間が追従する防水栓である。また、本発明によれば、上記の如く塑性変形によって細くなった状態で電線を屈曲させてもその屈曲に応じるように第一撓み空間が追従する防水栓である。また、本発明によれば、電線にこの軸方向の外力が加わった場合であっても第一撓み空間が変形して電線シール部側が電線の動きに追従し、逆にハウジングシール部側は動き難くなる防水栓である。また、本発明によれば、第一撓み空間の潰れにより電線の被覆へ与える力が軽減され、結果、上記塑性変形が抑制される防水栓である。 According to the present invention having the above-described features, the entire waterproof plug is inserted into the housing portion in the housing. That is, according to the present invention, a part of the waterproof plug does not extend outward from the opening end of the housing portion. Further, according to the present invention, the waterproof plug having the first bending space, even if the electric wire is thinned by plastic deformation (even if the coating is thinned by plastic deformation and the outer diameter of the electric wire is reduced), It is a waterproof plug that the first bending space follows so as to correspond to the thinness. Further, according to the present invention, even if the electric wire is bent in a state of being thinned by plastic deformation as described above, the waterproof plug follows the first bending space so as to respond to the bending. Further, according to the present invention, even when the external force in the axial direction is applied to the electric wire, the first bending space is deformed so that the electric wire seal side follows the movement of the electric wire, and conversely, the housing seal side moves. It is a waterproof plug that becomes difficult. Moreover, according to this invention, the force given to the coating | cover of an electric wire by crushing 1st bending space is reduced, As a result, it is a waterproofing stopper with which the said plastic deformation is suppressed.

請求項１に記載された本発明によれば、防水栓第一端部に開口し且つ外側第一リップ部の頂部から電線軸に向けて垂直に引いた垂直線上又は該垂直線の近傍までの深さになる潰れ可能な第一撓み空間を防水栓に形成することから、防水性能の向上に有効な反発力を防水栓に持たせることができるという効果を奏する。より具体的には、電線が仮に塑性変形によって細くなったとしてもその細さに応じるように第一撓み空間が追従することから、結果、防水性能の向上を図ることができるという効果を奏する。また、塑性変形によって細くなった状態で電線を屈曲させてもその屈曲に応じるように第一撓み空間が追従することから、結果、防水性能の向上を図ることができるという効果を奏する。また、本発明によれば、潰れ可能な第一撓み空間を形成することから、電線被覆へ与える力を軽減して上記塑性変形を抑制することができるという効果を奏する。すなわち、防水性能の向上を図ることができるという効果を奏する。また、本発明によれば、潰れ可能な第一撓み空間を形成することから、防水栓挿入時の挿入力を低減することができるという効果を奏する。また、本発明によれば、潰れ可能な第一撓み空間を形成することから、電線にこの軸方向の外力が加わった場合であっても動き難くする部分を持たせ、結果、防水栓のズレや傾き等を防止することができるという効果を奏する。また、本発明によれば、ハウジングにおける収容部の開口端から外側に延出する部分のない防水栓であることから、保護部品や飛び出し防止部品などを不要とし、結果、コネクタの部品点数削減に寄与することができるという効果を奏する。 According to the present invention described in claim 1, the waterproof plug opens at the first end portion and extends from the top of the outer first lip portion vertically to the electric wire axis or to the vicinity of the vertical line. Since the first crushable space that can be crushed is formed in the waterproof plug, there is an effect that the waterproof plug can have a repulsive force effective in improving the waterproof performance. More specifically, even if the electric wire becomes thin due to plastic deformation, the first bending space follows the thinness according to the thinness. As a result, the waterproof performance can be improved. In addition, even if the electric wire is bent in a state of being thinned by plastic deformation, the first bending space follows the bending so as to respond to the bending. As a result, the waterproof performance can be improved. Moreover, according to this invention, since the 1st bending space which can be crushed is formed, there exists an effect that the force given to an electric wire covering can be reduced and the said plastic deformation can be suppressed. That is, there is an effect that the waterproof performance can be improved. Moreover, according to this invention, since the 1st bending space which can be crushed is formed, there exists an effect that the insertion force at the time of waterproof plug insertion can be reduced. Further, according to the present invention, since the first deformable space that can be crushed is formed, the electric wire is provided with a portion that is difficult to move even when this axial external force is applied. As a result, the waterproof plug is displaced. There is an effect that it is possible to prevent tilting and the like. Further, according to the present invention, since the waterproof plug does not have a portion extending outward from the opening end of the housing portion in the housing, a protective component, a pop-out preventing component or the like is unnecessary, and as a result, the number of components of the connector is reduced. The effect that it can contribute is produced.

また、本発明によれば、第一撓み空間を形成する環状溝部の形状を、電線軸に沿って凹ませた形状、且つこの凹みを環状にした形状にすることから、防水性能の向上に有効な反発力を電線被覆の外面で均等に作用させることができるという効果を奏する。
また、本発明によれば、防水栓挿入時に外側第一リップ部が弾性変形し、その際に環状溝部において第一撓み空間を形成する面同士が接触するまで潰れることから、復元しようとする力を大きく生じさせることができ、結果、電線が仮に塑性変形によって細くなったとしてもその細さに確実に応じるように、また、細くなった状態で電線を屈曲させてもその屈曲に確実に応じるように作用させることができるという効果を奏する。
また、本発明によれば、防水栓第一端部の反対側となる防水栓第二端部に外側第一リップ部と同じ形状の外側第二リップ部を形成することから、収容部に対する挿入方向性のない形状の防水栓にすることができ、結果、作業性の向上を図ることができるという効果を奏する。
また、本発明によれば、外側第一リップ部と外側第二リップ部との間に外側第三リップ部を一又は複数配置形成することから、防水栓挿入時において外側第一リップ部や外側第二リップ部の倒れを起こり難くすることができるという効果を奏する。従って、防水性能の維持に寄与することができるという効果を奏する。
また、断面視山形状で頂部が外側第一リップ部及び外側第二リップ部よりも低くなるように外側第三リップ部を形成することから、防水栓挿入時に外側第一リップ部及び外側第二リップ部と同じくらいに弾性変形をさせる必要はなく、結果、外側第三リップ部を形成しても挿入力を増大させずに作業性を維持することができるという効果を奏する。この他、ハウジングにおける収容部の内面に接する程度の高さで外側第三リップ部を形成すれば、防水性能の向上に寄与することができるという効果を奏する。
In addition, according to the present invention, since the shape of the annular groove portion forming the first bending space is a shape recessed along the electric wire axis and a shape in which the recess is annular, it is effective for improving the waterproof performance. An advantageous effect is obtained in that a repulsive force can be applied evenly on the outer surface of the wire coating.
Further, according to the present invention, the outer first lip portion is elastically deformed when the waterproof plug is inserted, and at that time, the surfaces that form the first bending space in the annular groove portion are crushed until they come into contact with each other. As a result, even if the electric wire is thinned due to plastic deformation, it surely responds to the thinness, and even if the electric wire is bent in the thinned state, it surely responds to the bending The effect that it can be made to act is produced.
Further, according to the present invention, since the outer second lip portion having the same shape as the outer first lip portion is formed at the second end portion of the waterproof plug that is opposite to the first end portion of the waterproof plug, A waterproof plug having a non-directional shape can be obtained, and as a result, workability can be improved.
In addition, according to the present invention, one or a plurality of outer third lip portions are disposed between the outer first lip portion and the outer second lip portion. There is an effect that it is difficult to cause the second lip part to fall down. Therefore, there exists an effect that it can contribute to maintenance of waterproof performance.
Further, since the outer third lip portion is formed so that the top portion is lower than the outer first lip portion and the outer second lip portion in a cross-sectional view, the outer first lip portion and the outer second lip portion are inserted when the waterproof plug is inserted. It is not necessary to be elastically deformed as much as the lip portion. As a result, even if the outer third lip portion is formed, the workability can be maintained without increasing the insertion force. In addition, if the outer third lip portion is formed at a height that is in contact with the inner surface of the housing portion in the housing, there is an effect that the waterproof performance can be improved.

請求項２に記載された本発明によれば、第一撓み空間を形成する環状溝部の形状を、外側第一リップ部の頂部から電線軸に向けて垂直に引いた垂直線よりも奥に溝底が位置する形状にすることから、防水栓挿入時に外側第一リップ部の弾性変形に伴って第一撓み空間が潰れる。つまり、垂直線の位置で第一撓み空間があればその分、外側第一リップ部の弾性変形がし易くなるので、結果、挿入力を低減させることができるという効果を奏する。
According to the present invention described in claim 2, the groove shape of the annular groove forming the first deformation space, the back than the vertical lines drawn vertically toward the top of the outer first lip portion to the wire axis Since the bottom is positioned, the first bending space is crushed along with the elastic deformation of the outer first lip portion when the waterproof plug is inserted. That is, if there is the first bending space at the position of the vertical line, the outer first lip portion is easily elastically deformed accordingly, and as a result, the insertion force can be reduced.

請求項３に記載された本発明によれば、第一撓み空間を形成する環状溝部の配置を、外側第一リップ部と電線シール部との中央位置に合わせることから、防水性能の向上に有効な反発力を外側第一リップ部と電線シール部とに均等に作用させることができるという効果を奏する。
According to the third aspect of the present invention, the arrangement of the annular groove that forms the first bending space is matched to the center position of the outer first lip portion and the wire seal portion, which is effective in improving waterproof performance. The repulsive force can be uniformly applied to the outer first lip portion and the wire seal portion.

請求項４に記載された本発明によれば、環状溝部の形状を断面視すり鉢形状にすることから、第一撓み空間を形成する面同士が確実に接触するような形状にすることができるという効果を奏する。
According to the present invention described in claim 4 , since the shape of the annular groove portion is a mortar shape in cross-section, it can be formed into a shape in which the surfaces forming the first bending space are reliably in contact with each other. There is an effect.

請求項５に記載された本発明によれば、第一撓み空間と同じになる第二撓み空間を形成することから、収容部に対する挿入方向性のない形状の防水栓にすることができ、結果、作業性の向上を図ることができるという効果を奏する。
According to the present invention described in claim 5 , since the second bending space that is the same as the first bending space is formed, a waterproof plug having a shape having no insertion direction with respect to the housing portion can be obtained. There is an effect that workability can be improved.

請求項６に記載された本発明によれば、ハウジングシール部と電線シール部とに同じ形状の部分を形成することから、防水性能の向上に有効な反発力を均等に発揮させることができ、結果、防水性能の向上に寄与することができるという効果を奏する。 According to the present invention described in claim 6 , since the same shape portion is formed in the housing seal portion and the wire seal portion, a repulsive force effective in improving waterproof performance can be evenly exhibited. As a result, there is an effect that it can contribute to the improvement of waterproof performance.

本発明の防水栓の使用状態を示す断面図である。It is sectional drawing which shows the use condition of the waterproofing stopper of this invention. 防水栓の斜視図である。It is a perspective view of a waterproof stopper. 防水栓の断面図である。It is sectional drawing of a waterproof stopper. 防水栓における環状溝部の拡大断面図である。It is an expanded sectional view of the annular groove part in a waterproof plug. 防水栓の使用状態における環状溝部の拡大断面図である。It is an expanded sectional view of the annular groove part in the use condition of a waterproof stopper. 従来例の防水栓の使用状態を示す断面図である。It is sectional drawing which shows the use condition of the waterproof plug of a prior art example.

防水栓は、この全体がハウジングにおける収容部内に挿入されるものであり、収容部の内面に接するハウジングシール部と、電線の外面に接する電線シール部とを有する。また、防水栓は、防水栓第一端部と、この反対側の防水栓第二端部とを有する。ハウジングシール部には、防水栓第一端部側に配置される外側第一リップ部と、防水栓第二端部側に配置される外側第二リップ部と、これらの間に配置される外側第三リップ部とが形成される。また、電線シール部には、ハウジングシール部と同じ形状になる内側第一リップ部と、内側第二リップ部と、内側第三リップ部とが形成される。このような防水栓には、潰れ変形可能な第一撓み空間と、第二撓み空間とが同じ形状の環状溝部により形成される。 The entire waterproof plug is inserted into a housing portion in the housing, and includes a housing seal portion that contacts the inner surface of the housing portion and a wire seal portion that contacts the outer surface of the electric wire. Further, the waterproof plug has a waterproof plug first end portion and a waterproof plug second end portion on the opposite side. The housing seal portion includes an outer first lip portion disposed on the waterproof plug first end portion side, an outer second lip portion disposed on the waterproof plug second end portion side, and an outer portion disposed therebetween. A third lip portion is formed. The wire seal portion is formed with an inner first lip portion, an inner second lip portion, and an inner third lip portion that have the same shape as the housing seal portion. In such a waterproof plug, the first flexible space that can be crushed and deformed and the second flexible space are formed by annular grooves having the same shape.

以下、図面を参照しながら実施例を説明する。図１は本発明の防水栓の使用状態を示す断面図である。また、図２は防水栓の斜視図、図３は防水栓の断面図、図４は防水栓における環状溝部の拡大断面図、図５は防水栓の使用状態における環状溝部の拡大断面図である。 Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a sectional view showing a usage state of the waterproof plug of the present invention. 2 is a perspective view of the waterproof plug, FIG. 3 is a cross-sectional view of the waterproof plug, FIG. 4 is an enlarged cross-sectional view of the annular groove in the waterproof plug, and FIG. 5 is an enlarged cross-sectional view of the annular groove in the usage state of the waterproof plug. .

図１において、引用符号２１は本発明の防水栓を示す。防水栓２１は、複数本の電線２２からなるワイヤハーネスの端末に設けられるコネクタに対し、防水性能を持たせるために用いられる。具体的には、電線２２とハウジング２３との間の防水性能確保に用いられる。防水栓２１は、所謂ゴム栓であって、この全体が樹脂製のハウジング２３の収容部２４内に挿入される。防水栓２１は、公知の材料にて成形される（材料は特に限定されない。シール性及び弾力性を有すればよい）。尚、引用符号２５は、収容部２４の開口端を示す。開口端２５は、円形に開口するように形成される。 In FIG. 1, reference numeral 21 indicates the waterproof plug of the present invention. The waterproof plug 21 is used for providing waterproof performance to a connector provided at a terminal of a wire harness including a plurality of electric wires 22. Specifically, it is used for securing waterproof performance between the electric wire 22 and the housing 23. The waterproof plug 21 is a so-called rubber plug, and the whole is inserted into the housing portion 24 of the resin housing 23. The waterproof plug 21 is formed of a known material (the material is not particularly limited, as long as it has sealing properties and elasticity). Reference numeral 25 indicates an open end of the accommodating portion 24. The opening end 25 is formed so as to open in a circular shape.

図１ないし図３において、防水栓２１は、収容部２４の内面２６に接するハウジングシール部２７と、電線２２の外面２８（被覆外面）に接する電線シール部２９とを有する。また、防水栓２１は、防水栓第一端部３０と、この反対側の防水栓第二端部３１と、これら防水栓第一端部３０及び防水栓第二端部３１を貫通する電線挿通孔３２とを有する。 1 to 3, the waterproof plug 21 includes a housing seal portion 27 that is in contact with the inner surface 26 of the housing portion 24, and an electric wire seal portion 29 that is in contact with the outer surface 28 (covering outer surface) of the electric wire 22. The waterproof plug 21 includes a waterproof plug first end portion 30, a waterproof plug second end portion 31 on the opposite side, and a wire insertion penetrating the waterproof plug first end portion 30 and the waterproof plug second end portion 31. Hole 32.

ハウジングシール部２７には、防水栓第一端部３０側に配置される外側第一リップ部３３と、防水栓第二端部３１側に配置される外側第二リップ部３４と、これらの間に配置される外側第三リップ部３５とが形成される。また、電線シール部２９には、ハウジングシール部２７と同じ形状になる内側第一リップ部３６と、内側第二リップ部３７と、内側第三リップ部３８とが形成される（特に限定しないが、ハウジングシール部２７と同じ形状が好ましい）。このような防水栓には、潰れ変形可能な第一撓み空間３９と、第二撓み空間４０とが同じ形状の環状溝部４１、４１により形成される。 The housing seal portion 27 includes an outer first lip portion 33 disposed on the waterproof plug first end portion 30 side, an outer second lip portion 34 disposed on the waterproof plug second end portion 31 side, and a space therebetween. An outer third lip portion 35 is formed. Further, the electric wire seal portion 29 is formed with an inner first lip portion 36, an inner second lip portion 37, and an inner third lip portion 38 that have the same shape as the housing seal portion 27 (not particularly limited). The same shape as the housing seal portion 27 is preferable). In such a waterproof plug, a crushing deformable first bending space 39 and a second bending space 40 are formed by annular grooves 41 and 41 having the same shape.

防水栓２１は、図からも分かるが、挿入方向性が存在しない形状に形成される。すなわち、防水栓２１の端部となる防水栓第一端部３０と防水栓第二端部３１は、同じ形状に形成される。このような防水栓第一端部３０と防水栓第二端部３１は、電線軸Ａの方向に所定の距離で配置される。尚、防水栓第一端部３０と防水栓第二端部３１は、外側に延出する部分が存在しない形状に形成される（すなわち、図６の従来例とは異なる形状に形成される）。 As can be seen from the drawing, the waterproof plug 21 is formed in a shape having no insertion directionality. That is, the waterproof plug first end portion 30 and the waterproof plug second end portion 31 which are the end portions of the waterproof plug 21 are formed in the same shape. The waterproof plug first end portion 30 and the waterproof plug second end portion 31 are arranged at a predetermined distance in the direction of the electric wire axis A. The waterproof plug first end portion 30 and the waterproof plug second end portion 31 are formed in a shape that does not have an outwardly extending portion (that is, formed in a shape different from the conventional example of FIG. 6). .

外側第一リップ部３３は、収容部２４の内面２６に向けて凸となる断面視山形状に形成される。この山形状が電線２２の周方向に連続することにより、外観が環状に形成される。外側第一リップ部３３の頂部４２は、断面視円弧状に形成される。外側第一リップ部３３は、収容部２４への挿入前で、頂部４２からの径寸法Ｂが開口端２５の開口寸法Ｃよりも大きくなるように形成される（Ｂ＞Ｃ）。 The outer first lip portion 33 is formed in a cross-sectional mountain shape that is convex toward the inner surface 26 of the housing portion 24. When this mountain shape continues in the circumferential direction of the electric wire 22, the appearance is formed in an annular shape. The top portion 42 of the outer first lip portion 33 is formed in an arc shape in cross section. The outer first lip portion 33 is formed so that the diameter dimension B from the top portion 42 is larger than the opening dimension C of the opening end 25 (B> C) before being inserted into the accommodating portion 24.

外側第二リップ部３４は、収容部２４の内面２６に向けて凸となる断面視山形状に形成される。この山形状が電線２２の周方向に連続することにより、外観が環状に形成される。外側第二リップ部３４の頂部４３は、断面視円弧状に形成される。外側第二リップ部３４は、本実施例において外側第一リップ部３３と同じ形状に形成される。 The outer second lip portion 34 is formed in a cross-sectional mountain shape that is convex toward the inner surface 26 of the housing portion 24. When this mountain shape continues in the circumferential direction of the electric wire 22, the appearance is formed in an annular shape. The top portion 43 of the outer second lip portion 34 is formed in an arc shape in cross section. The outer second lip portion 34 is formed in the same shape as the outer first lip portion 33 in this embodiment.

外側第三リップ部３５は、収容部２４の内面２６に向けて凸となる断面視山形状に形成される。この山形状が電線２２の周方向に連続することにより、外観が環状に形成される。外側第三リップ部３５の頂部４４は、外側第一リップ部３３の頂部４２及び外側第二リップ部３４の頂部４３よりも高さが低くなるように形成される。別な言い方をすれば、外側第三リップ部３５は、外側第一リップ部３３及び外側第二リップ部３４よりも小さな山形状に形成される。外側第三リップ部３５は、防水栓２１が収容部２４へ挿入された際に、頂部４４が収容部２４の内面２６に接する程度の高さに形成される。外側第三リップ部３５は、外側第一リップ部３３及び外側第二リップ部３４に対し平坦部を作らずに連続するように形成される。別な言い方をすれば、谷となる形状位置で直ぐに外側第三リップ部３５が連続するように形成される。このような配置の外側第三リップ部３５は、外側第一リップ部３３及び外側第二リップ部３４が弾性変形した際、この倒れを防止する部分として機能する（倒れ防止に関しては後述する）。尚、外側第三リップ部３５は本実施例に限らず複数あってもよい。 The outer third lip portion 35 is formed in a cross-sectional mountain shape that is convex toward the inner surface 26 of the housing portion 24. When this mountain shape continues in the circumferential direction of the electric wire 22, the appearance is formed in an annular shape. The top portion 44 of the outer third lip portion 35 is formed to be lower in height than the top portion 42 of the outer first lip portion 33 and the top portion 43 of the outer second lip portion 34. In other words, the outer third lip portion 35 is formed in a smaller mountain shape than the outer first lip portion 33 and the outer second lip portion 34. The outer third lip portion 35 is formed to a height such that the top portion 44 contacts the inner surface 26 of the housing portion 24 when the waterproof plug 21 is inserted into the housing portion 24. The outer third lip portion 35 is formed to be continuous with the outer first lip portion 33 and the outer second lip portion 34 without forming a flat portion. In other words, the outer third lip portion 35 is formed so as to continue immediately at the shape position that becomes the valley. The outer third lip portion 35 having such an arrangement functions as a portion that prevents the collapse when the outer first lip portion 33 and the outer second lip portion 34 are elastically deformed (the prevention of the collapse will be described later). The outer third lip portion 35 is not limited to this embodiment, and a plurality of outer third lip portions 35 may be provided.

内側第一リップ部３６は、電線２２の外面２８に向けて（電線挿通孔３２側に）凸となる断面視山形状に形成される。この山形状が電線２２の周方向に連続することにより、外観が環状に形成される。内側第一リップ部３６の頂部４５は、断面視円弧状に形成される。内側第一リップ部３６は、電線２２への挿入前で、頂部４５からの径寸法Ｄが電線２２の外径寸法Ｅよりも小さくなるように形成される（Ｄ＜Ｅ）。 The inner first lip portion 36 is formed in a cross-sectional mountain shape that is convex toward the outer surface 28 of the electric wire 22 (to the electric wire insertion hole 32 side). When this mountain shape continues in the circumferential direction of the electric wire 22, the appearance is formed in an annular shape. The top portion 45 of the inner first lip portion 36 is formed in an arc shape in a sectional view. The inner first lip portion 36 is formed so that the diameter D from the top 45 is smaller than the outer diameter E of the electric wire 22 before being inserted into the electric wire 22 (D <E).

内側第二リップ部３７は、電線２２の外面２８に向けて（電線挿通孔３２側に）凸となる断面視山形状に形成される。この山形状が電線２２の周方向に連続することにより、外観が環状に形成される。内側第二リップ部３７の頂部４６は、断面視円弧状に形成される。内側第二リップ部３７は、本実施例において内側第一リップ部３６と同じ形状に形成される。 The inner second lip portion 37 is formed in a cross-sectional mountain shape that is convex toward the outer surface 28 of the electric wire 22 (to the electric wire insertion hole 32 side). When this mountain shape continues in the circumferential direction of the electric wire 22, the appearance is formed in an annular shape. The top portion 46 of the inner second lip portion 37 is formed in an arc shape in a sectional view. The inner second lip portion 37 is formed in the same shape as the inner first lip portion 36 in the present embodiment.

内側第三リップ部３８は、電線２２の外面２８に向けて（電線挿通孔３２側に）凸となる断面視山形状に形成される。この山形状が電線２２の周方向に連続することにより、外観が環状に形成される。内側第三リップ部３８の頂部４７は、内側第一リップ部３６の頂部４５及び内側第二リップ部３７の頂部４６よりも高さが低くなるように形成される。別な言い方をすれば、内側第三リップ部３８は、内側第一リップ部３６及び内側第二リップ部３７よりも小さな山形状に形成される。内側第三リップ部３８は、防水栓２１が電線２２に挿通された際に、頂部４７が電線２２の外面２８に接する程度の高さに形成される。内側第三リップ部３８は、内側第一リップ部３６及び内側第二リップ部３７が弾性変形した際、この倒れを防止する部分として形成される。尚、内側第三リップ部３８は本実施例に限らず複数あってもよい。 The inner third lip portion 38 is formed in a cross-sectional view mountain shape that is convex toward the outer surface 28 of the electric wire 22 (to the electric wire insertion hole 32 side). When this mountain shape continues in the circumferential direction of the electric wire 22, the appearance is formed in an annular shape. The top portion 47 of the inner third lip portion 38 is formed to be lower in height than the top portion 45 of the inner first lip portion 36 and the top portion 46 of the inner second lip portion 37. In other words, the inner third lip portion 38 is formed in a smaller mountain shape than the inner first lip portion 36 and the inner second lip portion 37. The inner third lip portion 38 is formed to a height such that the top portion 47 contacts the outer surface 28 of the electric wire 22 when the waterproof plug 21 is inserted into the electric wire 22. The inner third lip portion 38 is formed as a portion for preventing the collapse when the inner first lip portion 36 and the inner second lip portion 37 are elastically deformed. The inner third lip portion 38 is not limited to this embodiment, and a plurality of inner third lip portions 38 may be provided.

図３において、防水栓２１の断面形状部分を引用符号４８で示すと、この断面形状部分４８における水平線Ｆは電線軸Ａに平行な線になる。水平線Ｆは、断面形状部分４８の中心線であり、また、ハウジングシール部２７と電線シール部２９とを二分するような線でもある。この他、外側第一リップ部３３の頂部４２と、内側第一リップ部３６の頂部４５とを線で結ぶと、この線は電線軸Ａに対し垂直な線になる。これを垂直線Ｇと呼ぶことにすると、垂直線Ｇの中央位置で水平線Ｆが交差する。 In FIG. 3, when the cross-sectional shape portion of the waterproof plug 21 is indicated by reference numeral 48, the horizontal line F in the cross-sectional shape portion 48 is a line parallel to the electric wire axis A. The horizontal line F is a center line of the cross-sectional shape portion 48 and is also a line that bisects the housing seal portion 27 and the wire seal portion 29. In addition, when the top portion 42 of the outer first lip portion 33 and the top portion 45 of the inner first lip portion 36 are connected by a line, this line becomes a line perpendicular to the wire axis A. When this is called a vertical line G, the horizontal line F intersects at the center position of the vertical line G.

図からも分かるように、ハウジングシール部２７（外側第一リップ部３３、外側第二リップ部３４、及び外側第三リップ部３５）と、電線シール部２９（内側第一リップ部３６、内側第二リップ部３７、及び内側第三リップ部３８）は、水平線Ｆで線対称となる形状に形成される。 As can be seen from the figure, the housing seal portion 27 (the outer first lip portion 33, the outer second lip portion 34, and the outer third lip portion 35) and the electric wire seal portion 29 (the inner first lip portion 36, the inner first lip portion 36). The two lip portions 37 and the inner third lip portion 38) are formed in a shape that is line symmetric with respect to the horizontal line F.

上記の垂直線Ｇや水平線Ｆに基づき、以下では第一撓み空間３９、第二撓み空間４０、及び環状溝部４１について説明をする。尚、第一撓み空間３９と第二撓み空間４０は同じ形状であり、ここでは第一撓み空間３９の方を環状溝部４１と共に説明する。 Based on said vertical line G and horizontal line F, the 1st bending space 39, the 2nd bending space 40, and the annular groove part 41 are demonstrated below. In addition, the 1st bending space 39 and the 2nd bending space 40 are the same shapes, and the direction of the 1st bending space 39 is demonstrated with the annular groove part 41 here.

図１ないし図４において、第一撓み空間３９は、防水栓第一端部３０に開口し且つ垂直線Ｇの近傍までの深さになる潰れ変形可能な（撓み可能な）空間に形成される。このような第一撓み空間３９は、防水栓第一端部３０を電線軸Ａに沿って凹ませ、且つ凹みを環状にした環状溝部４１により形成される。環状溝部４１は、垂直線Ｇの中央位置に合わせて配置形成される。別な言い方をすれば、水平線Ｆを中心線にして配置形成される。本実施例の環状溝部４１は、溝底４９が垂直線Ｇよりも僅かに奥に位置する形状に形成される（微少な寸法Ｈ参照）。尚、溝底４９が垂直線Ｇ上に位置する形状や、垂直線Ｇの手前側に位置する形状であってもよい（本実施例が一番有効であるのは勿論である）。 1 to 4, the first bending space 39 is formed in a crushable (deflable) space that opens to the waterproof plug first end portion 30 and has a depth up to the vicinity of the vertical line G. . Such a first bending space 39 is formed by an annular groove portion 41 having the waterproof plug first end portion 30 recessed along the electric wire axis A and the recess being annular. The annular groove portion 41 is arranged and formed in accordance with the center position of the vertical line G. In other words, they are arranged and formed with the horizontal line F as the center line. The annular groove portion 41 of the present embodiment is formed in a shape in which the groove bottom 49 is located slightly behind the vertical line G (see minute dimension H). The groove bottom 49 may have a shape positioned on the vertical line G or a shape positioned on the front side of the vertical line G (this embodiment is of course the most effective).

環状溝部４１は、断面視すり鉢形状に形成される。また、環状溝部４１は、外側第一リップ部３３が垂直線Ｇに沿って弾性変形した際に、第一撓み空間３９を形成する面５０、５０同士が図１及び図５に示す如く接する形状に形成される。環状溝部４１は、水平線Ｆで線対称となる形状に形成される（一例であるが、面５０、５０同士が接し且つ水平線Ｆで線対称となる形状が最も好ましい）。 The annular groove 41 is formed in a mortar shape in cross section. The annular groove 41 has a shape in which the surfaces 50 and 50 forming the first bending space 39 are in contact with each other as shown in FIGS. 1 and 5 when the outer first lip 33 is elastically deformed along the vertical line G. Formed. The annular groove 41 is formed in a shape that is line symmetric with respect to the horizontal line F (which is an example, but a shape that is in contact with the surfaces 50 and 50 and is line symmetric with respect to the horizontal line F is most preferable).

上記構成及び構造において、防水栓２１を電線２２に挿通し、この後に電線２２の端末に図示しない端子金具を装着し、そして、防水栓２１の全体をハウジング２３の収容部２４内に挿入すると、図１に示す状態になり、電線２２とハウジング２３との間の防水性能が確保される。 In the above configuration and structure, when the waterproof plug 21 is inserted into the electric wire 22, a terminal fitting (not shown) is attached to the end of the electric wire 22, and the entire waterproof plug 21 is inserted into the housing portion 24 of the housing 23, It will be in the state shown in FIG. 1, and the waterproof performance between the electric wire 22 and the housing 23 will be ensured.

本発明によれば、防水栓第一端部３０に開口し且つ垂直線Ｇの近傍までの深さになる潰れ可能な第一撓み空間３９を形成することから、防水性能の向上に有効な反発力を防水栓２１に持たせることができる。より具体的には、電線２２が仮に塑性変形によって細くなったとしてもその細さに応じるように第一撓み空間３９が追従することから、結果、従来例よりも防水性能を向上させることができる。また、塑性変形によって細くなった状態で電線２２を屈曲させてもその屈曲に応じるように第一撓み空間３９が追従することから、結果、従来例よりも防水性能を向上させることができる。 According to the present invention, since the first flexible space 39 that can be crushed is formed at the first end portion 30 of the waterproof plug and has a depth up to the vicinity of the vertical line G, it is effective to improve the waterproof performance. The waterproof plug 21 can have a force. More specifically, even if the electric wire 22 becomes thin due to plastic deformation, the first bending space 39 follows so as to respond to the thinness. As a result, the waterproof performance can be improved as compared with the conventional example. . In addition, even if the electric wire 22 is bent in a state of being thinned by plastic deformation, the first bending space 39 follows so as to respond to the bending. As a result, the waterproof performance can be improved as compared with the conventional example.

また、本発明によれば、潰れ可能な第一撓み空間３９を形成することから、電線２２の外面２８へ与える力を軽減して上記塑性変形を抑制することができる。すなわち、従来例よりも防水性能を向上させることができる。 In addition, according to the present invention, since the crushable first bending space 39 is formed, the force applied to the outer surface 28 of the electric wire 22 can be reduced and the plastic deformation can be suppressed. That is, the waterproof performance can be improved as compared with the conventional example.

また、本発明によれば、潰れ可能な第一撓み空間３９を形成することから、収容部２４への防水栓２１の挿入時において、この挿入力を低減することができる。また、本発明によれば、潰れ可能な第一撓み空間３９を形成することから、電線２２に電線軸Ａの方向の外力が加わった場合であっても動き難くする部分を持たせることができる。これにより、防水栓２１のズレや傾き等を防止することができる。 In addition, according to the present invention, since the collapsible first bending space 39 is formed, this insertion force can be reduced when the waterproof plug 21 is inserted into the accommodating portion 24. In addition, according to the present invention, since the first deformable space 39 that can be crushed is formed, even if an external force in the direction of the electric wire axis A is applied to the electric wire 22, it is possible to have a portion that is difficult to move. . Thereby, the shift | offset | difference, inclination, etc. of the waterproof stopper 21 can be prevented.

また、本発明によれば、ハウジング２３における収容部２４の開口端２５から外側に延出する部分のない防水栓２１であることから、防水栓２１に対する保護部品や飛び出し防止部品などを不要とすることができる。従って、コネクタの部品点数削減に寄与することができる。 Further, according to the present invention, since the waterproof plug 21 does not have a portion extending outward from the opening end 25 of the housing portion 24 in the housing 23, a protective component or a pop-out preventing component for the waterproof plug 21 is unnecessary. be able to. Therefore, it can contribute to the reduction of the number of parts of the connector.

また、本発明によれば、図４に示す如く垂直線Ｇよりも寸法Ｈの分だけ奥に溝底４９が位置する形状の環状溝部４１であることから、垂直線Ｇの位置では第一撓み空間３９としての空間が生じ、従って収容部２４への防水栓２１の挿入時に外側第一リップ部３３が弾性変形するとその作用で第一撓み空間３９が潰れる。つまり、垂直線Ｇの位置で第一撓み空間３９があればその分、外側第一リップ部３３の弾性変形がし易くなるので、結果、防水栓２１の挿入力を低減させることができる。また、本発明によれば、垂直線Ｇの中央位置に合わせて環状溝部４１（第一撓み空間３９）を配置形成することから、防水性能の向上に有効な反発力をハウジングシール部２７と電線シール部２９とに均等に作用させることができる。 Further, according to the present invention, as shown in FIG. 4, since the groove bottom 49 has a shape in which the groove bottom 49 is located behind the vertical line G by the dimension H, the first bending is performed at the position of the vertical line G. Therefore, when the outer first lip portion 33 is elastically deformed when the waterproof plug 21 is inserted into the housing portion 24, the first bending space 39 is crushed by the action. That is, if there is the first bending space 39 at the position of the vertical line G, the outer first lip portion 33 is easily elastically deformed accordingly, and as a result, the insertion force of the waterproof plug 21 can be reduced. In addition, according to the present invention, since the annular groove 41 (first bending space 39) is arranged and formed in accordance with the center position of the vertical line G, the repulsive force effective in improving the waterproof performance is provided to the housing seal portion 27 and the electric wire. It is possible to act equally on the seal portion 29.

また、本発明によれば、防水栓２１の挿入時に外側第一リップ部３３が弾性変形し、その際に環状溝部４１において第一撓み空間３９を形成する面５０、５０同士が接触するまで潰れることから、復元しようとする力を大きく生じさせることができ、結果、電線２２が仮に塑性変形によって細くなったとしてもその細さに確実に応じるように、また、細くなった状態で電線２２を屈曲させてもその屈曲に確実に応じるように作用させることができる。 Further, according to the present invention, the outer first lip portion 33 is elastically deformed when the waterproof plug 21 is inserted, and at that time, the surfaces 50 and 50 forming the first bending space 39 in the annular groove portion 41 are crushed until they come into contact with each other. Therefore, it is possible to generate a large force to restore, and as a result, even if the electric wire 22 becomes thin due to plastic deformation, the electric wire 22 can be used in a thin state so as to reliably respond to the thinness. Even if it bends, it can be made to act to respond to the bend reliably.

また、本発明によれば、環状溝部４１の形状を断面視すり鉢形状にすることから、第一撓み空間３９を形成する面５０、５０同士を確実に接触させることができる。また、本発明によれば、外側第三リップ部３５を形成することから、防水栓２１の挿入時に外側第一リップ部３３や外側第二リップ部３４の倒れを起こり難くすることができる。具体的には、外側第一リップ部３３及び外側第二リップ部３４に対し平坦部を作らずに直ぐに谷となる形状位置で外側第三リップ部３５を連続させるように配置形成することから、外側第一リップ部３３及び外側第二リップ部３４の弾性変形の際の倒れ移動を外側第三リップ部３５の存在によって堰き止めることができる。すなわち、倒れ移動を抑制することができる。この倒れ移動の抑制は、外側第三リップ部３５の頂部４４の高さが収容部２４の内面２６に接する程度の高さであることも寄与する。何故ならば、外側第一リップ部３３及び外側第二リップ部３４が倒れようとしてその作用が外側第三リップ部３５に及んできても、外側第三リップ部３５の頂部４４が収容部２４の内面２６に接することで外側第三リップ部３５自体の弾性変形が抑制されるからである。外側第三リップ部３５が弾性変形し難い状態であれば、上記倒れ移動が堰き止められるのは（抑制されるのは）勿論である。以上説明したように、外側第一リップ部３３や外側第二リップ部３４の倒れを起こり難くすれば、防水性能の維持に寄与することができる。 Moreover, according to this invention, since the shape of the annular groove part 41 is made into cross-sectional mortar shape, the surfaces 50 and 50 which form the 1st bending space 39 can be made to contact reliably. Further, according to the present invention, since the outer third lip portion 35 is formed, it is possible to prevent the outer first lip portion 33 and the outer second lip portion 34 from falling when the waterproof plug 21 is inserted. Specifically, since the outer third lip portion 35 is continuously formed at the shape position that becomes a valley without forming a flat portion with respect to the outer first lip portion 33 and the outer second lip portion 34, The falling movement during the elastic deformation of the outer first lip portion 33 and the outer second lip portion 34 can be blocked by the presence of the outer third lip portion 35. That is, the falling movement can be suppressed. The suppression of the falling movement also contributes to the fact that the height of the top portion 44 of the outer third lip portion 35 is high enough to be in contact with the inner surface 26 of the housing portion 24. This is because even if the outer first lip portion 33 and the outer second lip portion 34 are about to fall down and the action reaches the outer third lip portion 35, the top portion 44 of the outer third lip portion 35 remains in the receiving portion 24. This is because the elastic deformation of the outer third lip portion 35 itself is suppressed by contacting the inner surface 26. Of course, if the outer third lip portion 35 is hardly elastically deformed, the above-described falling movement is blocked (suppressed). As described above, if it is difficult for the outer first lip portion 33 and the outer second lip portion 34 to fall down, it is possible to contribute to the maintenance of waterproof performance.

本発明は本発明の主旨を変えない範囲で種々変更実施可能なことは勿論である。 It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

２１…防水栓、２２…電線、２３…ハウジング、２４…収容部、２５…開口端、２６…内面、２７…ハウジングシール部、２８…外面、２９…電線シール部、３０…防水栓第一端部、３１…防水栓第二端部、３２…電線挿通孔、３３…外側第一リップ部、３４…外側第二リップ部、３５…外側第三リップ部、３６…内側第一リップ部、３７…内側第二リップ部、３８…内側第三リップ部、３９…第一撓み空間、４０…第二撓み空間、４１…環状溝部、４２〜４７…頂部、４８…断面形状部分、４９…溝底、５０…面、Ａ…電線軸、Ｆ…水平線、Ｇ…垂直線 DESCRIPTION OF SYMBOLS 21 ... Waterproof plug, 22 ... Electric wire, 23 ... Housing, 24 ... Housing part, 25 ... Open end, 26 ... Inner surface, 27 ... Housing seal part, 28 ... Outer surface, 29 ... Electric wire seal part, 30 ... First end of waterproof plug 31: Waterproof stopper second end, 32 ... Electric wire insertion hole, 33 ... Outer first lip part, 34 ... Outer second lip part, 35 ... Outer third lip part, 36 ... Inner first lip part, 37 ... inner second lip part, 38 ... inner third lip part, 39 ... first bending space, 40 ... second bending space, 41 ... annular groove part, 42-47 ... top part, 48 ... cross-sectional shape part, 49 ... groove bottom 50 ... Surface, A ... Wire shaft, F ... Horizontal line, G ... Vertical line

Claims

In the waterproof plug used to ensure the waterproof performance between the housing and the electric wire, having a housing seal portion in contact with the inner surface of the housing portion in the housing and an electric wire seal portion in contact with the outer surface of the electric wire,
The waterproof plug has a waterproof plug first end portion on the opening end side of the housing portion and a waterproof plug second end portion on the opposite side of the waterproof plug first end portion, and is entirely inserted into the housing portion. Is,
On the waterproof plug first end portion side of the housing seal portion, an outer first lip portion having a mountain shape in cross section is formed,
Between the outer first lip portion and the wire seal portion, a first bending space that can be crushed and deformed is formed,
The first bending space is formed by opening the first end portion of the waterproof plug and has a depth up to or near a vertical line drawn vertically from the top of the outer first lip portion toward the wire shaft. And the first flexible space is formed by an annular groove portion in which the first end portion of the waterproof plug is recessed along the wire axis and the recess is annular.
When the outer first lip portion is elastically deformed along the vertical line, the annular groove is formed in a shape in which the surfaces forming the first bending space are in contact with each other over the entire circumference.
An outer second lip portion having the same shape as the outer first lip portion is formed on the waterproof plug second end side of the housing seal portion,
Between the outer first lip portion and the outer second lip portion along the direction of the electric wire axis, one or a plurality of outer third lip portions are disposed and formed.
The waterproof third stopper, wherein the outer third lip portion is formed in a mountain shape in a sectional view in which a top portion is lower than the outer first lip portion and the outer second lip portion .

The waterproof plug according to claim 1,
Before verge shaped groove is waterproof plug, characterized in that it is formed in a shape groove bottom is located deeper than the vertical line.

The waterproof plug according to claim 2,
The waterproof plug, wherein the annular groove portion is disposed and formed in accordance with a center position of the vertical line between the outer first lip portion and the wire seal portion .

The waterproof plug according to claim 1 ,
The annular groove is formed in a cross-sectional mortar shape .

The waterproof plug according to claim 1, 2 , 3 or 4,
A waterproof plug , wherein a second bending space that is the same as the first bending space is formed between the outer second lip portion and the electric wire seal portion .

The waterproof plug according to claim 1 ,
The wire seal portion includes an inner first lip portion, an inner second lip portion, and an inner third lip that have the same shape as the outer first lip portion, the outer second lip portion, and the outer third lip portion. A waterproof plug characterized in that a part is formed .