JP5312432B2

JP5312432B2 - Power cable connection device and method for assembling the same

Info

Publication number: JP5312432B2
Application number: JP2010247514A
Authority: JP
Inventors: 重樹磯野
Original assignee: Mitsubishi Cable Industries Ltd
Current assignee: Mitsubishi Cable Industries Ltd
Priority date: 2010-11-04
Filing date: 2010-11-04
Publication date: 2013-10-09
Anticipated expiration: 2030-11-04
Also published as: JP2012100475A

Description

この発明は、各種機械装置に電力を供給する為の電力ケーブルの端部同士を、電気的且つ機械的に接続する為の接続装置及びその組立方法の改良に関する。具体的には、外径寸法を小さく抑えられる構造で、接続作業を容易に行え、且つ、接続部の抵抗を低く抑える事ができ、しかも、接続部の機械強度を十分に確保できる電力ケーブル用接続装置及びその組立方法を実現するものである。 The present invention relates to an improvement in a connecting device for electrically and mechanically connecting ends of a power cable for supplying electric power to various mechanical devices, and an assembling method thereof. Specifically, for a power cable that has a structure that can keep the outer diameter dimension small, can easily perform connection work, can suppress the resistance of the connection part, and can sufficiently secure the mechanical strength of the connection part. A connecting device and an assembling method thereof are realized.

各種工場や各種工事現場等で各種機械装置に電力を供給する為の、或は大規模ビルディングの配線として利用される電力ケーブルの端部同士は、銅系合金等の電気抵抗の低い金属により造った接続端子を備えた接続装置により接続する必要がある。電力ケーブルは、例えば工場のライン変更や工事等の進捗状況、或はビルディングの改装等に応じて接続状態を変更する必要がある為、接続作業を容易に行える構造である事が好ましい。又、送電ロスを低く抑える為に接続部の電気抵抗を低く抑える必要がある事は勿論、前記電力ケーブルに引っ張り方向の力が加わった場合にも外れない様に、十分な機械的強度（特に引っ張り強度）を有する事が必要である。この様な要求を満たす電力ケーブル用接続装置として、例えば特許文献１に記載された構造が知られている。 The ends of power cables used to supply power to various machinery and equipment at various factories and various construction sites or as wiring for large-scale buildings are made of metal with low electrical resistance, such as copper alloys. It is necessary to connect with a connecting device having a connecting terminal. The power cable needs to change the connection state according to the progress of the factory line change, the progress of construction, etc., or the renovation of the building, for example, and therefore it is preferable that the power cable has a structure that can be easily connected. Moreover, in order to keep the power transmission loss low, it is necessary to keep the electrical resistance of the connection part low, and of course, sufficient mechanical strength (especially in order not to come off even when a force in the pulling direction is applied to the power cable) It is necessary to have tensile strength. As a power cable connecting device that satisfies such a requirement, for example, a structure described in Patent Document 1 is known.

［従来技術の説明］
図６〜７は、この特許文献１に記載された、従来から知られている電力ケーブル用接続装置の１例を示している。この従来構造は、１対の電力ケーブル１ａ、１ｂ同士を、第一、第二の接続端子２、３と袋ナット４とにより接続するものである。これら両接続端子２、３は、それぞれ圧縮端子と呼ばれるもので、それぞれの基半部に前記両電力ケーブル１ａ、１ｂを構成する導体５ａ、５ｂを挿入した状態でこの基半部の直径を縮め、前記両電力ケーブル１ａ、１ｂの端部と前記両接続端子２、３とを、電気的且つ機械的に接続している。これら両接続端子２、３は、それぞれの先半部に形成した挿入孔６と挿入杆部７とを嵌合させた状態で組み合わせ、前記袋ナット４により、互いに非分離に結合している。前記挿入杆部７の基部にはゴム製のスペーサを外嵌して、温度変化に伴う寸法変化を吸収可能としている。更に、接続部の周囲を、環状の絶縁ゴム８ａ、８ｂ、及び、絶縁シート９により覆って、この接続部を絶縁している。 [Description of prior art]
6 to 7 show an example of a conventionally known power cable connecting device described in Patent Document 1. FIG. In this conventional structure, a pair of power cables 1 a and 1 b are connected by first and second connection terminals 2 and 3 and a cap nut 4. These connection terminals 2 and 3 are called compression terminals, respectively, and the diameters of the base halves are reduced with the conductors 5a and 5b constituting the power cables 1a and 1b inserted in the base halves. The ends of the power cables 1a and 1b and the connection terminals 2 and 3 are electrically and mechanically connected. These connection terminals 2 and 3 are combined in a state in which the insertion hole 6 and the insertion flange portion 7 formed in the respective first half portions are fitted, and are coupled to each other by the cap nut 4 in a non-separable manner. A rubber spacer is externally fitted to the base of the insertion collar 7 so as to be able to absorb dimensional changes accompanying temperature changes. Further, the periphery of the connecting portion is covered with the annular insulating rubbers 8a and 8b and the insulating sheet 9 to insulate the connecting portion.

上述の様な従来構造の場合、前記袋ナット４を締め付けたとしても、前記両接続端子２、３の表面同士が強く押し付けられる事はない。これら両接続端子２、３同士の間で電力を送る部分は、主として前記挿入孔６と前記挿入杆部７との嵌合部に存在する接触子の弾性によるが、この嵌合部に組み込まれる接触子の弾性に依存して大きな電力を送る為には、この嵌合部、延いては前記両接続端子２、３の直径を大きくする必要があり、電力ケーブル用接続装置の小型化の面から不利になる。 In the case of the conventional structure as described above, even if the cap nut 4 is tightened, the surfaces of the connection terminals 2 and 3 are not strongly pressed against each other. The portion for sending electric power between these connection terminals 2 and 3 is mainly incorporated into the fitting portion, although it depends mainly on the elasticity of the contact that exists in the fitting portion between the insertion hole 6 and the insertion flange portion 7. In order to send a large amount of power depending on the elasticity of the contact, it is necessary to increase the diameter of the fitting portion, and thus the connection terminals 2 and 3. Is disadvantageous.

［先発明の説明］
この様な従来技術が有する問題を解決し、外径寸法を小さく抑えられる構造で、接続作業を容易に行え、且つ、接続部の抵抗を低く抑える事ができる電力ケーブル用接続装置として、特願２００９−１２３８８５に開示された発明がある。本発明は、この先発明を改良したものであり、この先発明と共通する部分が多い為、先ず、この先発明に係る電力ケーブル用接続装置及びその組立方法に就いて、図８〜１３により説明する。この先発明に係る電力ケーブル用接続装置は、図８に示す様に、第一、第二の接続端子２ａ、３ａと、接続筒１０と、ロックナット１１と、それぞれが弾性環状部材である、１対のばね座金１２ａ、１２ｂとから成る。これら各部材２ａ、３ａ、１０、１１、１２ａ、１２ｂは、それぞれが、銅又は銅系合金等の電気抵抗の低い金属製である。又、前記両ばね座金１２ａ、１２ｂは、或る程度の弾性を有する合金製としている。この為に、必要に応じて、これら両ばね座金１２ａ、１２ｂを、燐青銅製、或いは、鉄系合金製とする事もできる。 [Description of Prior Invention]
As a power cable connection device that solves such problems of the prior art and has a structure that can keep the outer diameter size small, can easily perform the connection work, and can keep the resistance of the connection portion low. There is an invention disclosed in 2009-123885. The present invention is an improvement of the previous invention, and since there are many parts in common with the previous invention, first, a power cable connecting device and an assembling method thereof according to the previous invention will be described with reference to FIGS. As shown in FIG. 8, the power cable connecting device according to the present invention includes first and second connecting terminals 2a and 3a, a connecting cylinder 10, and a lock nut 11, each of which is an elastic annular member. It consists of a pair of spring washers 12a, 12b. Each of these members 2a, 3a, 10, 11, 12a, and 12b is made of a metal having a low electrical resistance such as copper or a copper-based alloy. The spring washers 12a and 12b are made of an alloy having a certain degree of elasticity. For this reason, if necessary, the two spring washers 12a and 12b can be made of phosphor bronze or iron alloy.

このうちの第一の接続端子２ａは、図９に示す様に、第一の接続部１３と、挿入杆部１４と、雄ねじ部１５と、第一の係止部１６とを備える。
このうちの第一の接続部１３は、図８に鎖線で示した、互いに接続すべき１対の電力ケーブル１ａ、１ｂのうちの一方の電力ケーブル１ａを構成する導体５ａの端部を接続固定する為のものである。図示の先発明の構造の場合、前記第一の接続部１３は、前述した従来構造に於ける第一、第二の接続端子２、３の基半部と同様、圧縮端子と呼ばれるもので、中心部に、基端面｛図９の（Ｂ）の左端面｝の中央部に開口する、有底の円孔１７ａを有する。この様な第一の接続部１３と前記導体５ａの端部とを接続するには、予め前記電力ケーブル１ａの絶縁層の端部を除去する事により露出させた前記導体５ａの端部を、前記円孔１７ａ内に挿入する。そして、前記第一の接続部１３を、その外径側から圧縮方向の力を加える事により、塑性変形させつつ直径を縮めて、前記導体５ａと前記第一の接続端子２ａとを、電気的且つ機械的に接続する。 Among these, the 1st connection terminal 2a is provided with the 1st connection part 13, the insertion collar part 14, the external thread part 15, and the 1st latching | locking part 16, as shown in FIG.
Of these, the first connecting portion 13 is connected and fixed to the end of the conductor 5a constituting one of the power cables 1a and 1b of the pair of power cables 1a and 1b to be connected to each other, which is indicated by a chain line in FIG. It is for doing. In the case of the structure of the prior invention shown in the drawing, the first connection portion 13 is called a compression terminal, like the base half portions of the first and second connection terminals 2 and 3 in the conventional structure described above. At the center, there is a bottomed circular hole 17a that opens to the center of the base end face {the left end face in FIG. 9B). In order to connect the first connection portion 13 and the end portion of the conductor 5a, the end portion of the conductor 5a exposed by removing the end portion of the insulating layer of the power cable 1a in advance is used. It inserts in the said circular hole 17a. Then, by applying a force in the compression direction from the outer diameter side of the first connection portion 13 to reduce the diameter while plastically deforming, the conductor 5a and the first connection terminal 2a are electrically connected. And mechanically connected.

又、前記挿入杆部１４は、前記第一の接続端子２ａの先半部｛図９の（Ｂ）の右半部｝に設けられたもので、図示の先発明の構造の場合には、円杆状に形成している。
又、前記雄ねじ部１５は、前記挿入杆部１４の軸方向中間部で、前記第一の接続部１３に近い基端寄り｛図９の（Ｂ）の左端寄り｝部分を除いた部分に設けられている。前記雄ねじ部１５の外径（山径及び谷径）は、前記挿入杆部１４の外径よりも大きい。
更に、前記第一の係止部１６は、前記第一の接続端子２ａの回転を阻止する為の工具であるスパナ或はパイプレンチ等を係止する為、前記第一の接続部１３の先端部｛図９の（Ｂ）の右端部｝外周面に設けられている。 The insertion hook 14 is provided in the front half of the first connection terminal 2a {the right half of FIG. 9B). It is shaped like a circle.
Further, the male screw portion 15 is provided at a portion of the intermediate portion in the axial direction of the insertion flange portion 14 except for a portion near the proximal end (close to the left end in FIG. 9B) close to the first connecting portion 13. It has been. The outer diameter (mountain diameter and valley diameter) of the male screw part 15 is larger than the outer diameter of the insertion collar part 14.
Further, the first locking portion 16 is configured to lock a spanner or a pipe wrench that is a tool for preventing the rotation of the first connection terminal 2a. The portion {the right end portion in FIG. 9B} is provided on the outer peripheral surface.

又、前記第二の接続端子３ａは、図１０に示す様に、第二の接続部１８と、ねじ杆部１９と、第二の係止部２０とを備える。
このうちの第二の接続部１８は、互いに接続すべき前記両電力ケーブル１ａ、１ｂのうちの他方の電力ケーブル１ｂの導体５ｂの端部を接続固定する為のもので、前記第二の接続端子３ａの基端部｛図１０の（Ａ）の右端部｝に設けられている。この様な前記第二の接続部１８も、前記第一の接続部１３と同様の、圧縮端子と呼ばれる構造を採用している。即ち、この第二の接続部１８の中心部に円孔１７ｂを形成し、この円孔１７ｂ内に、前記導体５ｂの端部で絶縁層から露出した部分を挿入可能としている。
又、前記ねじ杆部１９は、中間部乃至先半部に設けられている。このねじ杆部１９の外周面に形成した雄ねじ部の仕様（ピッチ円直径、ピッチ）は、前記雄ねじ部１５の仕様と同じである。
更に、前記第二の係止部２０は、前記第二の接続端子３ａの回転を阻止する為の工具であるスパナ、パイプレンチ等を係止する為、前記第二の接続部１８の基端部｛図１０の（Ａ）の左端部｝外周面に設けられている。 Further, as shown in FIG. 10, the second connection terminal 3 a includes a second connection portion 18, a screw flange portion 19, and a second locking portion 20.
Of these, the second connecting portion 18 is for connecting and fixing the end of the conductor 5b of the other power cable 1b of the two power cables 1a and 1b to be connected to each other. The terminal 3a is provided at the base end {the right end in FIG. 10A}. Such a second connection portion 18 also employs a structure called a compression terminal, similar to the first connection portion 13. That is, a circular hole 17b is formed at the center of the second connecting portion 18, and a portion exposed from the insulating layer at the end of the conductor 5b can be inserted into the circular hole 17b.
Moreover, the said screw collar part 19 is provided in the intermediate | middle part thru | or the first half part. The specifications (pitch circle diameter, pitch) of the male screw portion formed on the outer peripheral surface of the screw flange portion 19 are the same as the specifications of the male screw portion 15.
Further, the second locking portion 20 is a base end of the second connecting portion 18 for locking a spanner, a pipe wrench or the like which is a tool for preventing the rotation of the second connecting terminal 3a. The portion {the left end portion in FIG. 10A} is provided on the outer peripheral surface.

又、前記接続筒１０は、図１１に示す様に、ねじ孔２１と、第三の係止部２２とを備える。このうちのねじ孔２１は、前記雄ねじ部１５及び前記ねじ杆部１９を螺合させる為のもので、前記接続筒１０の中心部に、この接続筒１０を軸方向に貫通する状態で設けられている。又、前記第三の係止部２２は、この接続筒１０を回転させる為の工具であるスパナ、パイプレンチ等を係止する為、この接続筒１０の中間部外周面に設けられている。 Further, as shown in FIG. 11, the connection tube 10 includes a screw hole 21 and a third locking portion 22. Among these, the screw hole 21 is for screwing the male screw portion 15 and the screw flange portion 19, and is provided in a central portion of the connection tube 10 so as to penetrate the connection tube 10 in the axial direction. ing. The third locking portion 22 is provided on the outer peripheral surface of the intermediate portion of the connection cylinder 10 in order to lock a spanner, a pipe wrench, etc., which are tools for rotating the connection cylinder 10.

又、前記ロックナット１１は、前記ねじ杆部１９に螺着されている。
又、前記両ばね座金１２ａ、１２ｂのうちの一方のばね座金１２ａは、図１２に示す様に、前記挿入杆部１４の基端寄り部分、即ち、前記第一の接続部１３と前記雄ねじ部１５との間部分に外嵌している。これに対して、他方のばね座金１２ｂは、図１３に示す様に、前記ねじ杆部１９のうちで前記ロックナット１１よりも先端寄り部分に外嵌している。 The lock nut 11 is screwed to the screw flange portion 19.
Also, one of the spring washers 12a and 12b has a spring washer 12a as shown in FIG. 12, which is a portion near the base end of the insertion collar 14, that is, the first connecting portion 13 and the male screw portion. 15 is fitted on the part between. On the other hand, as shown in FIG. 13, the other spring washer 12 b is externally fitted to a portion closer to the tip than the lock nut 11 in the screw flange portion 19.

そして、図８に示す様に、前記雄ねじ部１５を前記ねじ孔２１に螺合し更に締め付ける事により、前記第一の接続部１３の先端面と前記接続筒１０の一端面との間で、前記一方のばね座金１２ａを圧縮している。又、前記ねじ杆部１９を前記ねじ孔２１に、このねじ杆部１９の先端面が前記挿入杆部１４の先端面に突き当たる迄螺合し更に締め付けている。更に、前記ロックナット１１を前記接続筒１０の他端面に向けて締め付ける事により、これらロックナット１１と接続筒１０の他端面との間で、前記他方のばね座金１２ｂを圧縮している。 Then, as shown in FIG. 8, by screwing the male screw portion 15 into the screw hole 21 and further tightening, between the tip surface of the first connection portion 13 and one end surface of the connection tube 10, The one spring washer 12a is compressed. Further, the screw hook portion 19 is screwed into the screw hole 21 until the front end surface of the screw hook portion 19 abuts on the front end surface of the insertion hook portion 14, and is further tightened. Further, the other spring washer 12 b is compressed between the lock nut 11 and the other end surface of the connecting tube 10 by tightening the lock nut 11 toward the other end surface of the connecting tube 10.

上述の様な構造を有する電力ケーブル用接続装置は、次の様な手順で組み立てる。即ち、図１２に示す様に、予め前記第一の接続端子２ａの前記挿入杆部１４の基端寄り部分に前記一方のばね座金１２ａを外嵌しておく。且つ、図１３に示す様に、予め前記第二の接続端子３ａの前記ねじ杆部１９の基端部に前記ロックナット１１を、中間部乃至先端部に前記接続筒１０を、それぞれ螺着すると共に、これらロックナット１１と接続筒１０との間に前記他方のばね座金１２ｂを挟持しておく。図１３に示す様に、前記各部材３ａ、１０、１１、５ｂを組み合わせた状態で、前記ねじ杆部１９の先端部は、この接続筒１０の端部開口から僅かに突出するか、或いは、この端部開口よりも内側（この接続筒１０の軸方向中間寄りに凹んだ位置）に存在する（前記ねじ杆部１９が図示の例よりも短い場合）。 The power cable connecting device having the above-described structure is assembled by the following procedure. That is, as shown in FIG. 12, the one spring washer 12a is externally fitted in advance to the proximal end portion of the insertion flange 14 of the first connection terminal 2a. In addition, as shown in FIG. 13, the lock nut 11 is screwed in advance to the proximal end portion of the screw flange portion 19 of the second connection terminal 3a, and the connection cylinder 10 is screwed to the intermediate portion or the distal end portion. At the same time, the other spring washer 12 b is sandwiched between the lock nut 11 and the connecting tube 10. As shown in FIG. 13, in a state where the members 3 a, 10, 11, 5 b are combined, the tip end portion of the screw flange portion 19 slightly protrudes from the end opening of the connection tube 10, or It exists inside this end opening (a position recessed toward the middle in the axial direction of the connecting cylinder 10) (when the screw flange 19 is shorter than the illustrated example).

そこで、図１２に示した第一のユニット２８と図１３に示した第二のユニット２９とを、互いに同心に配置した状態のまま互いに近づけ合う。前記ねじ杆部１９の外周面に形成したねじ山の位相と、前記雄ねじ部１５を構成するねじ山の位相とを規制した場合には、前記挿入杆部１４の先端面と前記ねじ杆部１９の先端面とを突き当てる。そうでない場合には、これら両先端面同士を近接対向させる。次いで、これら両先端面同士を突き当てた状態、或いは近接対向させた状態から、前記接続筒１０を回転させ、この接続筒１０を前記挿入杆部１４に向けて移動させる。更に、前記ねじ孔２１と前記雄ねじ部１５とを螺合させ、更に締め付ける。この締め付け作業は、前記第一の係止部１６に係止したスパナにより前記第一の接続端子２ａの回転を阻止しつつ、前記第三の係止部２２に係止したスパナにより、前記接続筒１０を回転させる事により行う。そして、前記接続筒１０の一端面と前記第一の接続部１３の先端面との間で、前記一方のばね座金１２ａを強く圧縮する。 Therefore, the first unit 28 shown in FIG. 12 and the second unit 29 shown in FIG. 13 are brought close to each other while being concentrically arranged. When the phase of the screw thread formed on the outer peripheral surface of the screw flange portion 19 and the phase of the screw thread constituting the male screw portion 15 are restricted, the distal end surface of the insertion flange portion 14 and the screw flange portion 19 Butt the end face of. If not, the two end surfaces are brought close to each other. Next, the connecting tube 10 is rotated from a state in which the two end surfaces are abutted with each other, or in a state of being opposed to each other, and the connecting tube 10 is moved toward the insertion flange 14. Further, the screw hole 21 and the male screw portion 15 are screwed together and further tightened. The tightening operation is performed by using the spanner locked to the third locking portion 22 while preventing the rotation of the first connection terminal 2a by the spanner locked to the first locking portion 16. This is done by rotating the tube 10. Then, the one spring washer 12a is strongly compressed between the one end face of the connection tube 10 and the front end face of the first connection portion 13.

次いで、前記ロックナット１１を回転させつつ前記接続筒１０に向け移動させ、更に締め付ける。この締め付け作業は、前記第二の係止部２０に係止したスパナにより前記第二の接続端子３ａの回転を阻止しつつ、前記ロックナット１１に係止したスパナにより、このロックナット１１を回転させる事により行う。そして、このロックナット１１と前記接続筒１０の他端面との間で、前記他方のばね座金１２ｂを強く圧縮する。 Next, the lock nut 11 is moved toward the connection tube 10 while rotating, and further tightened. In this tightening operation, the lock nut 11 is rotated by the spanner locked to the lock nut 11 while the rotation of the second connection terminal 3 a is prevented by the spanner locked to the second locking portion 20. To do. Then, the other spring washer 12b is strongly compressed between the lock nut 11 and the other end face of the connecting cylinder 10.

前述の様に構成する先発明に係る電力ケーブル用接続装置によれば、特殊な形状を有する部品を使用せず、低コストで造る事ができる。即ち、この電力ケーブル用接続装置を構成する第一の接続端子２ａと、第二の接続端子３ａと、接続筒１０と、ロックナット１１と、１対のばね座金１２ａ、１２ｂとは、何れも、単純な形状を有する為、何れも加工が容易であって、低コストで造れる。又、前記各部品２ａ、３ａ、１０、１１を、それぞれ円形を基本とする断面形状に構成する事により、必要な強度を確保しつつ、外径寸法を小さくできる。 According to the power cable connecting device according to the previous invention configured as described above, it can be manufactured at low cost without using a part having a special shape. That is, each of the first connection terminal 2a, the second connection terminal 3a, the connection cylinder 10, the lock nut 11, and the pair of spring washers 12a and 12b constituting the power cable connection device is provided. Since they have a simple shape, they are easy to process and can be manufactured at low cost. Further, by configuring each of the components 2a, 3a, 10, and 11 to have a cross-sectional shape based on a circle, the outer diameter can be reduced while ensuring the necessary strength.

又、各部材２ａ、３ａ、１０、１１、１２ａ、１２ｂを組み合わせて電力ケーブル用接続装置を組み立てる作業は、第一〜第三の係止部１６、２０、２２及びロックナット１１の外周面にスパナを係止して、前記第一、第二の接続端子２ａ、３ａの回転を阻止しつつ、接続筒１０及びロックナット１１を回転させる事により、容易に行える。又、接続作業に伴って電力ケーブル１ａ、１ｂが、問題となる程捩られる事もない。この為、接続作業を容易に行う事ができる。そして、組立作業を完了した状態では、雄ねじ部１５及びねじ杆部１９を構成する雄ねじ山の片側面と、ねじ孔２１を構成する雌ねじ山の片側面とが、これら雄ねじ部１５及びねじ杆部１９とねじ孔２１との締め付けに基づいて強く当接する。この様に、前記各ねじ山の側面同士が強く当接した状態では、前記第一、第二の両接続端子２ａ、３ａと前記接続筒１０とが、電気的に確実に接続された状態となり、接続部の抵抗を低く抑える事ができる。しかも、接続部の機械強度を十分に確保できる。 Moreover, the operation | work which assembles the connection apparatus for electric power cables combining each member 2a, 3a, 10, 11, 12a, 12b is carried out to the outer peripheral surface of the 1st-3rd latching | locking parts 16, 20, and 22 and the lock nut 11. This can be done easily by locking the spanner and rotating the connection tube 10 and the lock nut 11 while preventing the rotation of the first and second connection terminals 2a and 3a. Further, the power cables 1a and 1b are not twisted so as to cause a problem in connection with the connection work. For this reason, connection work can be performed easily. In the state where the assembling work is completed, one side surface of the male screw thread constituting the male screw part 15 and the screw thread part 19 and one side surface of the female screw thread constituting the screw hole 21 are the male screw part 15 and the screw collar part. Strong contact is made based on the tightening of the screw holes 21 and the screw holes 21. In this way, in a state where the side surfaces of the respective screw threads are in strong contact with each other, the first and second connection terminals 2a and 2a and the connection tube 10 are in an electrically reliably connected state. The resistance of the connection part can be kept low. In addition, the mechanical strength of the connecting portion can be sufficiently secured.

又、前記ロックナット１１の締め付け及び１対のばね座金１２ａ、１２ｂの弾力に基づいて、前記雄ねじ部１５及び前記ねじ杆部１９と前記ねじ孔２１との螺合部が不用意に緩む事もない。この為、前記接続部の電気抵抗を低く抑え、しかも、接続部の機械強度を十分に確保した状態を、長期間に亙って安定して維持できる。
更に、図１３に示した様に、組立作業に先立って、前記第二の接続端子３ａと前記ロックナット１１と前記ばね座金１２ｂと前記接続筒１０とを、電力ケーブル用接続装置の製造工場等で予め組み合わせておけば、この電力ケーブル用接続装置の組立現場での作業の容易化を図れる。又、部品を紛失する事で、組立作業が不能になる事もなくなる。 Further, the male screw portion 15 and the screw engagement portion 19 and the screw hole 21 may loosen carelessly based on the tightening of the lock nut 11 and the elasticity of the pair of spring washers 12a and 12b. Absent. For this reason, the electrical resistance of the said connection part can be suppressed low, and the state which fully ensured the mechanical strength of the connection part can be maintained stably over a long period of time.
Further, as shown in FIG. 13, prior to the assembly work, the second connection terminal 3a, the lock nut 11, the spring washer 12b, and the connection tube 10 are connected to a manufacturing plant for a power cable connection device or the like. If it is combined in advance, the work at the assembly site of the power cable connecting device can be facilitated. Moreover, the assembly work is not disabled by losing the parts.

上述の様な先発明に係る電力ケーブル用接続装置及びその組立方法は、外径寸法を小さくして小型・軽量化を図ると共に、接続部の抵抗を低く抑え、且つ、接続部の機械強度を確保する面からは十分な効果を得られる。但し、接続作業を容易に行う面からは改良の余地がある。又、小型・軽量化の面からも、軸方向寸法短縮に関しては、やはり改良の余地がある。 The power cable connecting device and its assembling method according to the prior invention as described above are designed to reduce the outer diameter and reduce the size and weight, keep the resistance of the connecting portion low, and increase the mechanical strength of the connecting portion. A sufficient effect can be obtained from the aspect of securing. However, there is room for improvement in terms of facilitating connection work. Moreover, there is still room for improvement in terms of shortening the axial dimension in terms of size and weight reduction.

本発明は、上述の様な事情に鑑みて、外径寸法を小さくして小型・軽量化を図ると共に、接続部の抵抗を低く抑え、且つ、接続部の機械強度を確保すると言った、先発明により得られる作用・効果を損なう事なく、接続作業を容易化し、しかも、軸方向寸法を短縮して、より一層の小型・軽量化を可能にすべく発明したものである。 In view of the circumstances as described above, the present invention aims to reduce the outer diameter size to reduce the size and weight, suppress the resistance of the connection portion, and secure the mechanical strength of the connection portion. The present invention was invented to facilitate the connection work without impairing the functions and effects obtained by the invention and to further reduce the size and weight by reducing the axial dimension.

本発明の電力ケーブル用接続装置及びその組立方法のうち、請求項１に記載した電力ケーブル用接続装置は、それぞれが、銅又は銅系合金等の電気抵抗の低い金属製である、第一の接続端子と、第二の接続端子と、接続筒と、ロックナットと、１対の弾性環状部材とから成る。 Of the power cable connecting device and the assembling method thereof according to the present invention, each of the power cable connecting devices described in claim 1 is made of a metal having a low electrical resistance, such as copper or a copper-based alloy. It consists of a connection terminal, a second connection terminal, a connection tube, a lock nut, and a pair of elastic annular members.

このうちの第一の接続端子は、第一の接続部と接続杆部とを備える。
このうちの第一の接続端子は、基半部に設けられた、互いに接続すべき１対の電力ケーブルのうちの一方の電力ケーブルの端部を接続固定する為の第一の接続部と、先半部に設けられた接続杆部とを備える。
又、前記接続杆部は、少なくとも軸方向中間部に設けられた雄ねじ部と、この雄ねじ部から連続する状態で軸方向先端部に設けられた雄ねじ部と、この雄ねじ部よりも小径の先端側円柱部とを備える。 Among these, the 1st connection terminal is provided with a 1st connection part and a connection collar part.
Of these, the first connection terminal is provided in the base half, a first connection portion for connecting and fixing the end of one of the power cables to be connected to each other, A connecting collar provided in the first half.
In addition, the connecting rod portion includes at least a male screw portion provided at an axially intermediate portion, a male screw portion provided at an axial tip portion in a state continuous from the male screw portion, and a distal end side having a smaller diameter than the male screw portion. A cylindrical portion.

又、前記第二の接続端子は、基端部に設けられた、互いに接続すべき１対の電力ケーブルのうちの他方の電力ケーブルの端部を接続固定する為の第二の接続部と、中間部乃至先半部に設けられたねじ杆部と、このねじ杆部の先端部に、このねじ杆部の先端面中央部に開口する状態で設けられた、前記先端側円柱部を挿入可能な位置決め用凹孔とを備える。 Further, the second connection terminal is provided at the base end portion, a second connection portion for connecting and fixing the end portion of the other power cable of the pair of power cables to be connected to each other, The tip side cylindrical part provided in a state where it opens to the center of the front end surface of the screw hook part can be inserted into the screw hook part provided in the middle part or the front half part and the tip part of the screw hook part. And a concave hole for positioning.

又、前記接続筒は、中心部に軸方向に貫通する状態で設けられた、前記雄ねじ部及び前記ねじ杆部を螺合させる為のねじ孔を備える。
又、前記ロックナットは、前記ねじ杆部に螺着されている。
又、前記両弾性環状部材は、ばね座金、皿板ばね等、それぞれが軸方向に弾性的に圧縮可能な部材である。この様な１対の弾性環状部材のうちの一方の弾性環状部材は、前記基端側円柱部の周囲部分に、他方の弾性環状部材は、前記ねじ杆部のうちで前記ロックナットよりも先端寄り部分に、それぞれ外嵌されている。
そして、前記位置決め用凹孔に前記先端側円柱部を挿入した状態で、前記雄ねじ部を前記ねじ孔に螺合し更に締め付ける事により、前記第一の接続部の先端面と前記接続筒の一端面との間で、前記一方の弾性環状部材を圧縮している。
更に、前記ねじ杆部を前記ねじ孔に螺合させた状態で、前記ロックナットを前記接続筒の他端面に向けて締め付ける事により、これらロックナットと接続筒の他端面との間で前記他方の弾性環状部材を圧縮している。 Further, the connection tube includes a screw hole provided in a state of penetrating in the axial direction in a center portion for screwing the male screw portion and the screw flange portion.
Further, the lock nut is screwed onto the screw flange portion.
The two elastic annular members are members such as a spring washer and a disc spring that are elastically compressible in the axial direction. One elastic annular member of such a pair of elastic annular members is provided at a peripheral portion of the base-end-side cylindrical portion, and the other elastic annular member is provided at a distal end of the screw flange portion with respect to the lock nut. The outer parts are fitted on the side portions.
Then, in a state where the distal end side cylindrical portion is inserted into the positioning concave hole, the male screw portion is screwed into the screw hole and further tightened, whereby one end surface of the first connecting portion and one of the connecting cylinders are connected. The one elastic annular member is compressed between the end faces.
Further, by tightening the lock nut toward the other end surface of the connection tube in a state where the screw flange portion is screwed into the screw hole, the other end surface between the lock nut and the other end surface of the connection tube is The elastic annular member is compressed.

又、請求項２に記載した電力ケーブル用接続装置の組立方法は、上述の様な請求項１に記載した電力ケーブル用接続装置を組み立てるのに、予め前記第一の接続端子の基端部分に、前記一方の弾性環状部材を外嵌しておく。且つ、予め前記第二の接続端子の前記ねじ杆部の基端部に前記ロックナットを、中間部乃至先端部に前記接続筒を、それぞれ螺着すると共に、これらロックナットと接続筒との間に前記他方の弾性環状部材を挟持しておく。
又、前記ねじ杆部の先端面と前記接続筒の軸方向端面との軸方向距離を、前記先端側円柱部の軸方向高さよりも小さくした状態で、この先端側円柱部を前記位置決め用凹孔に挿入する事により、前記第一の接続端子の中心軸と、前記第二の接続端子及び前記接続筒の中心軸とを一致させる。
その後、前記接続筒を回転させ、この接続筒を前記雄ねじ部に向けて移動させる事により、この接続筒の内周面の前記ねじ孔とこの雄ねじ部とを螺合させ更に締め付けて、この接続筒の一端面と前記第一の接続部の先端面との間で前記一方の弾性環状部材を圧縮する。
次いで、前記ロックナットを回転させつつ前記接続筒に向け移動させ更に締め付けて、これらロックナットと接続筒の他端面との間で前記他方の弾性環状部材を圧縮する。 According to a second aspect of the present invention, there is provided a method for assembling the power cable connecting device according to the first aspect of the present invention. The one elastic annular member is externally fitted. In addition, the lock nut is screwed in advance to the base end portion of the screw flange portion of the second connection terminal, and the connection cylinder is screwed to the intermediate portion or the distal end portion, and between the lock nut and the connection tube. The other elastic annular member is held between the two.
In addition, when the axial distance between the distal end surface of the screw flange and the axial end surface of the connecting cylinder is smaller than the axial height of the distal end cylindrical portion, the distal end cylindrical portion is moved to the positioning recess. By inserting it into the hole, the central axis of the first connection terminal is aligned with the central axis of the second connection terminal and the connection cylinder.
Thereafter, by rotating the connecting cylinder and moving the connecting cylinder toward the male threaded portion, the screw hole on the inner peripheral surface of the connecting cylinder and the male threaded portion are screwed together and further tightened. The one elastic annular member is compressed between one end face of the tube and the front end face of the first connecting portion.
Next, while rotating the lock nut, the lock nut is moved toward the connection tube and further tightened, and the other elastic annular member is compressed between the lock nut and the other end surface of the connection tube.

前述の様に構成する本発明の電力ケーブル用接続装置によれば、特殊な形状を有する部品を使用せず、低コストで造る事ができる。即ち、この電力ケーブル用接続装置を構成する第一の接続端子と、第二の接続端子と、接続筒と、ロックナットと、１対の弾性環状部材とは、何れも単純な形状を有する為、何れも加工が容易であって、低コストで造れる。又、各部品を、それぞれ円形を基本とする断面形状に構成する事により、必要な強度を確保しつつ、外径寸法を小さくできる。又、各部材を組み合わせて電力ケーブル用接続装置を組み立てる作業は、第一〜第三の係止部及びロックナットの外周面に、スパナ等の工具を係止して（これら第一〜第三の係止部の全部又は一部を省略した場合には、当該省略した部材の外周面にパイプレンチ等の工具を係止して）、前記第一、第二の接続端子の回転を阻止しつつ、前記接続筒及び前記ロックナットを回転させる事により、容易に行える。又、接続作業に伴ってケーブルが捩られる事もない為、接続作業を容易に行う事ができる。そして、組立作業を完了した状態では、雄ねじ部及びねじ杆部を構成する雄ねじ山の片側面と、ねじ孔を構成する雌ねじ山の片側面とが、これら雄ねじ部及びねじ杆部とねじ孔との締め付けに基づいて強く当接する。この様に、前記各ねじ山の側面同士が強く当接した状態では、前記第一、第二の接続端子と前記接続筒とが、電気的に確実に接続された状態となり、接続部の抵抗を低く抑える事ができる。しかも、この接続部の機械強度を十分に確保できる。又、前記ロックナットの締め付け及び前記両弾性環状部材の弾力に基づいて、前記雄ねじ部及び前記ねじ杆部と前記ねじ孔との螺合部が不用意に緩む事もない。この為、前記接続部の抵抗を低く抑え、しかも、この接続部の機械強度を十分に確保した状態を、長期間に亙って安定して維持できる。 According to the power cable connecting device of the present invention configured as described above, it can be manufactured at low cost without using parts having a special shape. That is, since the first connection terminal, the second connection terminal, the connection cylinder, the lock nut, and the pair of elastic annular members that constitute the power cable connection device have simple shapes. All are easy to process and can be manufactured at low cost. Further, by configuring each component in a cross-sectional shape based on a circle, the outer diameter can be reduced while ensuring the necessary strength. In addition, the operation of assembling the power cable connecting device by combining the respective members is performed by locking a tool such as a spanner on the outer peripheral surfaces of the first to third locking portions and the lock nut (the first to third locking devices). If all or part of the locking portion is omitted, a tool such as a pipe wrench is locked on the outer peripheral surface of the omitted member) to prevent the first and second connection terminals from rotating. However, it can be easily performed by rotating the connecting cylinder and the lock nut. Further, since the cable is not twisted during the connection work, the connection work can be easily performed. Then, in the state where the assembly work is completed, one side surface of the male screw thread constituting the male screw part and the screw thread part and one side surface of the female thread thread constituting the screw hole are the male screw part, the screw collar part and the screw hole. Strong contact is made based on the tightening. In this way, in the state where the side surfaces of the respective screw threads are in strong contact with each other, the first and second connection terminals and the connection tube are in a state of being reliably connected electrically, and the resistance of the connection portion Can be kept low. In addition, the mechanical strength of the connecting portion can be sufficiently ensured. Further, the male screw portion and the screw engagement portion between the screw collar portion and the screw hole are not loosened carelessly based on the tightening of the lock nut and the elasticity of the both elastic annular members. For this reason, the resistance of the connecting portion can be kept low, and a state in which the mechanical strength of the connecting portion is sufficiently secured can be stably maintained over a long period of time.

更に、請求項２に記載した組立方法の様に、組立作業に先立って、第二の接続端子とロックナットと弾性環状部材と接続筒とを、電力ケーブル用接続装置の製造工場等で予め組み合わせておけば、この電力ケーブル用接続装置の組立現場での作業の容易化を図れる。又、部品を紛失する事で、組立作業が不能になる事もなくなる。
以上の作用・効果は、前述した先発明の場合と同様であり、本発明によれば、上述した先発明の場合と同様に得られる。
特に、本発明の電力ケーブル用接続装置及びその組立方法の場合には、前記雄ねじ部と前記ねじ筒とを螺合させるのに先立って、前記第二の位置決め用凹孔に前記先端側円柱部を挿入する事により、前記第一の接続端子の中心軸と、前記第二の接続端子及び前記接続筒の中心軸とを、容易に一致させる事ができる。
この為、それぞれを電力ケーブルの端部に接続した、前記第一、第二の両端子同士の接続作業を、前述した先発明に比べて、より容易化できる。 Further, as in the assembling method described in claim 2, prior to the assembling work, the second connecting terminal, the lock nut, the elastic annular member, and the connecting cylinder are pre-combined at a manufacturing factory of the connecting device for the power cable. Then, the work at the assembly site of the power cable connecting device can be facilitated. Moreover, the assembly work is not disabled by losing the parts.
The above operations and effects are the same as those of the above-described prior invention, and according to the present invention, the same effects as those of the above-described prior invention can be obtained.
In particular, in the case of the power cable connecting device and the method of assembling the same according to the present invention, prior to screwing the male screw portion and the screw cylinder, the tip side cylindrical portion is inserted into the second positioning concave hole. By inserting, the central axis of the first connection terminal and the central axes of the second connection terminal and the connection cylinder can be easily matched.
For this reason, the connection work of said 1st and 2nd terminals which connected each to the edge part of an electric power cable can be made easier compared with the previous invention mentioned above.

本発明の実施の形態の１例を、組み立て完了後の状態で示す、半部切断側面図。The half section side view which shows one example of embodiment of this invention in the state after completion of an assembly. 第一の接続端子の半部切断側面図。The half part cutting side view of a 1st connection terminal. 第二の接続端子の半部切断側面図。The half part side view of the 2nd connecting terminal. 接続筒の半部切断側面図。The half part side view of a connection cylinder. 構成各部材を組み合わせて組み立てる途中の状態を示す、半部切断側面図。The half part cutting side view which shows the state in the middle of assembling combining each member of a structure. 従来構造の１例を示す分解斜視図。The disassembled perspective view which shows an example of a conventional structure. 組み立てた状態で示す断面図。Sectional drawing shown in the assembled state. 先発明に係る構造の１例を示す側面図。The side view which shows one example of the structure which concerns on a prior invention. 同じく第一の接続端子の端面図（Ａ）及び側面図（Ｂ）。Similarly, an end view (A) and a side view (B) of the first connection terminal. 同じく第二の接続端子の側面図（Ａ）及び端面図（Ｂ）。Similarly, the side view (A) and end view (B) of the second connection terminal. 同じく接続筒の側面図（Ａ）及び（Ａ）のＸ−Ｘ断面図（Ｂ）。Similarly, XX sectional drawing (B) of the side view (A) and (A) of a connection cylinder. 同じく第一の接続端子とばね座金とを組み合わせた状態を示す側面図。The side view which shows the state which combined the 1st connection terminal and the spring washer similarly. 同じく第二の接続端子と、接続筒と、弾性環状部材であるばね座金と、ロックナットとを組み合わせた状態を示す側面図。Similarly, the side view which shows the state which combined the 2nd connection terminal, the connection pipe | tube, the spring washer which is an elastic annular member, and the lock nut.

図１〜５は、本発明の実施の形態の１例を示している。尚、本例の特徴は、第一、第二の両接続端子２ｂ、３ｂの先半部の形状を工夫する事で、これら両接続端子２ｂ、３ｂ同士の接続作業をより容易にし、合わせて、接続筒１０ａの軸方向寸法の短縮化による、電力ケーブル用接続装置全体としての軸方向寸法の短縮化を可能にする点にある。その他の部分の構成及び作用に就いては、先に説明した先発明と同様であるから、同等部分に関する説明は、省略若しくは簡略にし、以下、本例の特徴部分を中心に説明する。 1 to 5 show an example of an embodiment of the present invention. In addition, the feature of this example is that the work of connecting the two connection terminals 2b and 3b is made easier by devising the shape of the first half of the first and second connection terminals 2b and 3b. Thus, the axial dimension of the power cable connecting apparatus as a whole can be shortened by shortening the axial dimension of the connecting cylinder 10a. Since the configuration and operation of the other parts are the same as those of the previous invention described above, explanations regarding the equivalent parts will be omitted or simplified, and the following will focus on the characteristic parts of this example.

前記第一の接続端子２ｂの先半部に設けられた接続杆部２３は、基端側円柱部２４と、雄ねじ部１５ａと、先端側円柱部２５とを備える。
このうちの基端側円柱部２４は、圧縮端子である第一の接続部１３寄り部分に設けられている。尚、この基端側円柱部２４は、省略する事もできる。
又、前記雄ねじ部１５ａは、前記基端側円柱部２４から連続する状態で軸方向中間部に設けられており、この基端側円柱部２４よりも大径である。
更に、前記先端側円柱部２５は、前記雄ねじ部１５ａから連続する状態で軸方向先端部に設けられており、前記基端側円柱部２４よりも更に小径である。 The connection flange 23 provided in the first half of the first connection terminal 2b includes a proximal end side cylindrical portion 24, a male screw portion 15a, and a distal end side cylindrical portion 25.
Among these, the base end side cylindrical part 24 is provided in the part near the 1st connection part 13 which is a compression terminal. In addition, this base end side cylindrical part 24 can also be abbreviate | omitted.
Further, the male screw portion 15 a is provided at an axially intermediate portion in a state of being continuous from the proximal end side cylindrical portion 24, and has a larger diameter than the proximal end side cylindrical portion 24.
Further, the distal end side cylindrical portion 25 is provided at the axial distal end portion in a state of being continuous from the male screw portion 15 a and has a smaller diameter than the proximal end side cylindrical portion 24.

又、前記第二の接続端子３ｂの中間部乃至先半部に設けられたねじ杆部１９ａに位置決め用凹孔２６を、このねじ杆部１９ａの先端面中央部に開口する状態で設けている。この位置決め用凹孔２６の内径は、前記先端側円柱部２５の外径よりも僅かに（例えば数十〜百数十μｍ程度）大きくして、この先端側円柱部２５を前記位置決め用凹孔２６内に、ほぼがたつきなく挿入可能としている。又、この位置決め用凹孔２６の深さＤは、前記先端側円柱部２５の高さＨよりも大きく（Ｄ＞Ｈ）して、この先端側円柱部２５を前記位置決め用凹孔２６内に挿入し切れる様にしている。更に、挿入した状態で、前記第一、第二の両接続端子２ｂ、３ｂ同士が、ほぼ同心になる様にしている。尚、前記先端側円柱部２５を前記位置決め用凹孔２６内に挿入する作業を容易に行える様にする為、この先端側円柱部２５の先端面外周縁部と前記位置決め用凹孔２６の開口周縁部との少なくとも一方には、面取りを施している。 Further, a positioning concave hole 26 is provided in a screw hole portion 19a provided in an intermediate portion or a front half portion of the second connection terminal 3b so as to open at a central portion of the tip end surface of the screw flange portion 19a. . An inner diameter of the positioning concave hole 26 is slightly larger than an outer diameter of the distal end side cylindrical portion 25 (for example, about several tens to several hundreds of μm), and the distal end side cylindrical portion 25 is made to be the positioning concave hole. 26 can be inserted almost without rattling. In addition, the depth D of the positioning concave hole 26 is larger than the height H of the leading end side cylindrical portion 25 (D> H), and the leading end side cylindrical portion 25 is placed in the positioning concave hole 26. I'm trying to insert it. Further, the first and second connection terminals 2b and 3b are substantially concentric with each other in the inserted state. In order to facilitate the operation of inserting the distal end side cylindrical portion 25 into the positioning concave hole 26, the outer peripheral edge portion of the distal end surface of the distal end side cylindrical portion 25 and the opening of the positioning concave hole 26 are provided. At least one of the peripheral edge portion is chamfered.

又、前記接続筒１０ａは、前述した先発明を構成する接続筒１０（図８、１１、１３参照）と同様に、中心部にねじ孔２１ａを、軸方向に貫通する状態で設けている。このねじ孔２１ａと、前記雄ねじ部１５ａと、前記ねじ杆部１９ａとの、ピッチ並びにピッチ円直径は、互いに同じとして、これら雄ねじ部１５ａ及びねじ杆部１９ａを前記ねじ孔２１ａに螺合させられる様にしている。電力ケーブル用接続装置の組み立てを完了した状態では、前述した先発明の場合と同様、図１に示す様に、前記第一の接続端子２ｂの第一の接続部１３の先端面と前記接続筒１０ａの軸方向片端面との間で一方のばね座金１２ａを弾性的に押し潰す。又、この接続筒１０ａの軸方向他端面とロックナット１１との間で、他方のばね座金１２ｂを弾性的に押し潰す。この状態で、前記雄ねじ部１５ａ及び前記ねじ杆部１９ａを構成する雄ねじ山の軸方向側面と、前記ねじ孔２１ａを構成する雌ねじ山の軸方向側面とが強く当接する。そして、前記第一、第二の両接続端子２ｂ、３ｂと前記接続筒１０ａとの当接部の電気抵抗を低く抑える。 In addition, the connecting tube 10a is provided with a screw hole 21a in the central portion so as to penetrate in the axial direction in the same manner as the connecting tube 10 (see FIGS. 8, 11 and 13) constituting the above-described invention. The pitch and pitch circle diameter of the screw hole 21a, the male screw portion 15a, and the screw flange portion 19a are the same, and the male screw portion 15a and the screw flange portion 19a are screwed into the screw hole 21a. Like. In the state where the assembly of the power cable connecting device is completed, as in the case of the above-described prior invention, as shown in FIG. 1, the front end surface of the first connecting portion 13 of the first connecting terminal 2b and the connecting tube One spring washer 12a is crushed elastically between one axial end face of 10a. Further, the other spring washer 12b is elastically crushed between the other axial end surface of the connecting tube 10a and the lock nut 11. In this state, the axial side surface of the male screw thread constituting the male screw portion 15a and the screw flange portion 19a strongly contacts the axial side surface of the female screw thread forming the screw hole 21a. And the electrical resistance of the contact portion between the first and second connection terminals 2b, 3b and the connection tube 10a is kept low.

又、本例の場合、前記第一の接続端子２ｂ側の前記先端側円柱部２５を、前記第二の接続端子３ｂ側の前記位置決め用凹孔２６内に挿入し切った状態で、前記雄ねじ部１５ａと前記ねじ杆部１９ａとが、それぞれの軸方向端面同士で突き合わされる。前述した先発明の構造の様に、雄ねじ部１５とねじ杆部１９との間に挿入杆部１４の先端部（図８参照）が存在する事はない。従って、本例の構造を構成する前記接続筒１０ａの軸方向長さは、前記先発明の構造を構成する接続筒１０よりも短くできる。この為、この先発明の構造に比べて軸方向寸法の短縮化が可能になり、この先発明の構造に比べて、より小型・軽量化を図り易くなる。 In the case of this example, the male screw is inserted in the state where the distal end side cylindrical portion 25 on the first connection terminal 2b side is fully inserted into the positioning concave hole 26 on the second connection terminal 3b side. The portion 15a and the screw flange portion 19a are abutted at the respective axial end surfaces. As in the structure of the above-described prior invention, the distal end portion (see FIG. 8) of the insertion flange portion 14 does not exist between the male screw portion 15 and the screw flange portion 19. Therefore, the axial length of the connecting cylinder 10a constituting the structure of this example can be made shorter than the connecting cylinder 10 constituting the structure of the previous invention. For this reason, it is possible to shorten the axial dimension as compared with the structure of the prior invention, and it becomes easier to reduce the size and weight compared to the structure of the prior invention.

この様な本例の構造の組み立てる際には、先ず、前記第二の接続端子３ｂの先半部に設けた前記ねじ杆部１９ａを、前記接続筒１０ａ内に螺入する。そして、図５に示す様に、このねじ杆部１９ａの先端面とこの接続筒１０ａの軸方向両端面のうち、前記第一の接続端子２ｂ側の片端面（図５の左端面）との軸方向距離Ｌを、前記先端側円柱部２５の軸方向高さＨよりも十分に小さく（Ｌ≪Ｈ）する。好ましくは、前記ねじ杆部１９ａの先端面を、前記接続筒１０ａの片端面と同一平面上に位置させるか、この片端面よりも少し突出させる。そして、この状態で、前記先端側円柱部２５を前記位置決め用凹孔２６に挿入する。この挿入作業により、前記第一の接続端子２ｂの中心軸と、前記第二の接続端子３ｂ及び前記接続筒１０ａの中心軸とを一致させる事ができる。これら各部材２ｂ、３ｂ、１０ａの中心軸を互いに一致させられる事により、この状態で未だ螺合していない、前記第一の接続端子２ｂの雄ねじ部１５ａと、前記接続筒１０ａのねじ孔２１ａとを、容易に螺合させられる状態になる。 When assembling such a structure of this example, first, the screw flange portion 19a provided in the front half of the second connection terminal 3b is screwed into the connection cylinder 10a. And as shown in FIG. 5, between the front end surface of this screw collar part 19a and the axial direction both end surfaces of this connection pipe | tube 10a, it is the one end surface (left end surface of FIG. 5) by the side of said 1st connection terminal 2b. The axial distance L is made sufficiently smaller (L << H) than the axial height H of the distal end side cylindrical portion 25. Preferably, the tip end surface of the screw flange portion 19a is positioned on the same plane as the one end surface of the connection tube 10a or slightly protrudes from the one end surface. In this state, the distal end side cylindrical portion 25 is inserted into the positioning concave hole 26. By this insertion operation, the central axis of the first connection terminal 2b can be aligned with the central axes of the second connection terminal 3b and the connection cylinder 10a. By making the central axes of these members 2b, 3b, and 10a coincide with each other, the male screw portion 15a of the first connection terminal 2b and the screw hole 21a of the connection tube 10a that are not yet screwed in this state. Can be easily screwed together.

そこで、この接続筒１０ａを回転させつつ、前記雄ねじ部１５ａに向けて移動させる事により、この接続筒１０ａの内周面の前記ねじ孔２１ａとこの雄ねじ部１５ａとを螺合させ更に締め付ける。そして、この接続筒１０ａの軸方向片端面と、前記第一の接続部１３の先端面との間で、前記一方のばね座板１２ａを弾性的に圧縮する。次いで、前記ロックナット１１を回転させつつ前記接続筒１０ａに向け移動させ更に締め付けて、このロックナット１１とこの接続筒１０ａの他端面との間で、前記他方のばね座板１２ｂを弾性的に圧縮する。尚、図５には、説明の便宜上、前記軸方向距離Ｌを表しているが、実際に図５に示す状態を実現するには、Ｌ≒０としてから、前記接続筒１０ａを前記第一の接続端子２ｂに向けて移動させる。
上述の様にして行う本例の組立方法の場合には、前記第一の接続端子２ｂの中心軸と、前記第二の接続端子３ｂ及び前記接続筒１０ａの中心軸とを、容易に一致させる事ができて、それぞれを電力ケーブルの端部に接続した、前記第一、第二の両端子２ｂ、３ｂ同士の接続作業を、前述した先発明に比べて、より容易化できる。 Therefore, by rotating the connection tube 10a toward the male screw portion 15a, the screw hole 21a on the inner peripheral surface of the connection tube 10a and the male screw portion 15a are screwed and further tightened. The one spring seat plate 12a is elastically compressed between one axial end surface of the connection tube 10a and the front end surface of the first connection portion 13. Next, the lock nut 11 is rotated and moved toward the connection tube 10a and further tightened, and the other spring seat plate 12b is elastically moved between the lock nut 11 and the other end surface of the connection tube 10a. Compress. FIG. 5 shows the axial distance L for convenience of explanation, but in order to actually realize the state shown in FIG. 5, the connection cylinder 10a is attached to the first tube after L≈0. Move toward the connection terminal 2b.
In the case of the assembly method of the present example performed as described above, the central axis of the first connection terminal 2b and the central axes of the second connection terminal 3b and the connection cylinder 10a are easily matched. As a result, the connection work between the first and second terminals 2b and 3b, each of which is connected to the end of the power cable, can be made easier than in the previous invention.

本発明を実施するに当たって、前記第一、第二の両接続端子２ｂ、３ｂに設けた第一、第二の接続部１３、１８に電力ケーブル１ａ、１ｂの導体５ａ、５ｂを接続する際に、これら両第一、第二の接続部１３、１８を六角ダイスにより圧縮する場合がある。この場合に、圧縮後に於けるこれら両第一、第二の接続部１３、１８の外周面の形状は六角形となり、そのままスパナ等の工具を係止可能になる。そこで、この様な形状を有する前記第一、第二の接続部１３、１８の外周面を、そのまま、前記第一、第二の両接続端子２ｂ、３ｂの回転を阻止する為の係止部として利用する事もできる。これに対して、前記接続筒１０ａの外周面には、前述の従来構造の第三の係止部２２（図８、１１参照）と同様の、複数の平坦面２７、２７を形成する等により、この接続筒１０ａを回転させる為の工具を係止する為の係止部とする事が好ましい。但し、各部材２ｂ、３ｂ、１０ａの回り止めを図ったり、或は回転させる為の工具として、パイプレンチを使用する場合には、前記各部材２ｂ、３ｂ、１０ａの外周面を、単なる円筒面のままとしても良い。 In carrying out the present invention, when connecting the conductors 5a and 5b of the power cables 1a and 1b to the first and second connection portions 13 and 18 provided in the first and second connection terminals 2b and 3b, respectively. In some cases, the first and second connecting portions 13 and 18 may be compressed with a hexagonal die. In this case, the shape of the outer peripheral surfaces of the first and second connecting portions 13 and 18 after compression is a hexagon, and a tool such as a spanner can be locked as it is. Therefore, the outer peripheral surfaces of the first and second connection portions 13 and 18 having such a shape are used as they are to stop the rotation of the first and second connection terminals 2b and 3b. It can also be used as On the other hand, a plurality of flat surfaces 27, 27 are formed on the outer peripheral surface of the connecting tube 10a, similar to the third locking portion 22 (see FIGS. 8 and 11) having the conventional structure described above. It is preferable to use a locking portion for locking a tool for rotating the connecting cylinder 10a. However, when a pipe wrench is used as a tool for preventing or rotating each member 2b, 3b, 10a, the outer peripheral surface of each member 2b, 3b, 10a is simply a cylindrical surface. It can be left as it is.

又、前記第一、第二の両接続端子２ｂ、３ｂ及び前記接続筒１０ａの外周面には、必要に応じて錫（Ｓｎ）等のメッキを施す事もできる。
更に、図１に示した電力ケーブル用接続装置を組み立てた後、必要に応じてこの電力ケーブル用接続装置を、ゴム等の弾性材製の絶縁筒により覆う。この絶縁筒は、例えば特許文献２に記載される等により周知の様に、保持スリーブに外嵌した状態で、予め一方の電力ケーブルの周囲に配置しておく。そして、前記電力ケーブル用接続装置を組み立てた後、この電力ケーブル用接続装置の周囲に移動させてから、前記保持スリーブを抜き取る。この抜き取りに伴って前記絶縁筒の直径が弾性的に縮まり、前記電力ケーブル用接続装置が、前記導体５ａ、５ｂの端部で絶縁層から露出した部分と共に、周囲との絶縁が確保され、且つ、水密を確保した状態で覆われる。尚、前記電力ケーブル用接続装置の絶縁処理に就いては、前記絶縁筒を外嵌する以外にも、絶縁性の熱収縮チューブを密に外嵌したり、或は、絶縁テープを巻回する事によっても行える。熱収縮チューブによる絶縁処理は、狭い場所での処理に有効であり、絶縁テープによる絶縁処理は、コスト低減の面から有効である。 Further, the outer peripheral surfaces of the first and second connection terminals 2b and 3b and the connection cylinder 10a can be plated with tin (Sn) or the like as required.
Further, after assembling the power cable connecting device shown in FIG. 1, the power cable connecting device is covered with an insulating tube made of an elastic material such as rubber as necessary. As is well known, for example, as described in Patent Document 2, this insulating cylinder is arranged in advance around one of the power cables in a state of being fitted around the holding sleeve. After assembling the power cable connection device, the power cable connection device is moved around the power cable connection device, and then the holding sleeve is removed. As a result of this extraction, the diameter of the insulating cylinder is elastically reduced, and the power cable connecting device is secured from the insulation layer at the ends of the conductors 5a and 5b, together with the portions exposed from the insulating layer, and Covered with watertightness. In addition, for the insulation treatment of the power cable connecting device, in addition to externally fitting the insulating tube, an insulating heat-shrinkable tube is closely fitted or an insulating tape is wound. You can also do it. Insulation treatment using a heat-shrinkable tube is effective for processing in a narrow place, and insulation treatment using an insulating tape is effective in terms of cost reduction.

１ａ、１ｂ電力ケーブル
２、２ａ、２ｂ第一の接続端子
３、３ａ、３ｂ第二の接続端子
４袋ナット
５ａ、５ｂ導体
６挿入孔
７挿入杆部
８ａ、８ｂ絶縁ゴム
９絶縁シート
１０、１０ａ接続筒
１１ロックナット
１２ａ、１２ｂばね座金
１３第一の接続部
１４挿入杆部
１５、１５ａ雄ねじ部
１６第一の係止部
１７ａ、１７ｂ円孔
１８第二の接続部
１９、１９ａねじ杆部
２０第二の係止部
２１、２１ａねじ孔
２２第三の係止部
２３接続杆部
２４基端側円柱部
２５先端側円柱部
２６位置決め用凹孔
２７平坦面
２８第一のユニット
２９第二のユニット 1a, 1b Power cable 2, 2a, 2b First connection terminal 3, 3a, 3b Second connection terminal 4 Cap nut 5a, 5b Conductor 6 Insertion hole 7 Insertion flange 8a, 8b Insulation rubber 9 Insulation sheet 10, 10a Connection cylinder 11 Lock nut 12a, 12b Spring washer 13 First connection portion 14 Insertion flange portion 15, 15a Male thread portion 16 First locking portion 17a, 17b Circular hole 18 Second connection portion 19, 19a Screw flange portion 20 2nd latching | locking part 21, 21a Screw hole 22 3rd latching | locking part 23 Connection collar part 24 Base end side cylindrical part 25 Front end side cylindrical part 26 Positioning concave hole 27 Flat surface 28 1st unit 29 2nd unit

特開２００８−１９８５０９号公報JP 2008-198509 A 特開２００１−３５３７８０号公報JP 2001-353780 A

Claims

A first connection terminal, a second connection terminal, a connection tube, a lock nut, and a pair of elastic annular members, each of which is elastically compressible in the axial direction, each made of a conductive material Consisting of
Of these, the first connection terminal is provided in the base half, a first connection portion for connecting and fixing the end of one of the power cables to be connected to each other, A connecting hook provided in the first half, and this connecting hook is provided at the axially leading end in a state continuous from the male screw provided at least in the axial middle part, It is equipped with a cylindrical part on the tip side smaller in diameter than this male thread part,
The second connection terminal is provided at the base end portion, a second connection portion for connecting and fixing the end portion of the other power cable of the pair of power cables to be connected to each other, and an intermediate portion Positioning that can be inserted into the tip of the screw rod provided at the front half and the tip of the screw rod at the center of the tip of the screw hook With a concave hole for
The connecting cylinder is provided with a screw hole for screwing the male screw portion and the screw flange portion provided in a state of penetrating in the axial direction in the center portion,
The lock nut is screwed to the screw flange portion,
One elastic annular member of the two elastic annular members is in the peripheral portion of the base end side cylindrical portion, and the other elastic annular member is in the screw flange portion closer to the tip than the lock nut. Each is fitted,
With the male threaded portion screwed into the screw hole and further tightened in a state where the distal end side cylindrical portion is inserted into the positioning concave hole, the distal end surface of the first connecting portion and one end surface of the connecting cylinder The one elastic annular member is compressed between,
By tightening the lock nut toward the other end surface of the connection tube in a state where the screw flange portion is screwed into the screw hole, the other elastic force is provided between the lock nut and the other end surface of the connection tube. A connecting device for a power cable compressing an annular member.

A method for assembling the power cable connecting device according to claim 1,
The one elastic annular member is externally fitted in advance to the base end portion of the first connection terminal, and a lock nut is attached to the base end portion of the screw collar portion of the second connection terminal in advance. The connection tube is screwed to the tip portion, and the other elastic annular member is sandwiched between the lock nut and the connection tube,
With the axial distance between the distal end surface of the threaded collar portion and the axial end surface of the connecting cylinder smaller than the axial height of the distal end side cylindrical portion, the distal end side cylindrical portion is used as the positioning concave hole. By inserting, after making the central axis of the first connection terminal coincide with the central axis of the second connection terminal and the connection cylinder,
By rotating the connecting tube and moving the connecting tube toward the male threaded portion, the screw hole on the inner peripheral surface of the connecting tube and the male threaded portion are screwed together and further tightened, and one end of the connecting tube is secured. Compressing the one elastic annular member between the end surface and the front end surface of the first connecting portion;
Next, a method for assembling the power cable connecting device for compressing the other elastic annular member between the lock nut and the other end face of the connecting tube by rotating the lock nut toward the connecting tube and further tightening the lock nut .