JP5790201B2 - Terminal equipment for electronic equipment - Google Patents
Terminal equipment for electronic equipment Download PDFInfo
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- JP5790201B2 JP5790201B2 JP2011141641A JP2011141641A JP5790201B2 JP 5790201 B2 JP5790201 B2 JP 5790201B2 JP 2011141641 A JP2011141641 A JP 2011141641A JP 2011141641 A JP2011141641 A JP 2011141641A JP 5790201 B2 JP5790201 B2 JP 5790201B2
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Description
本発明は、汎用インバータ装置などを対象とする電子機器の端子装置に関し、詳しくは樹脂製の端子台に嵌め込み装着して端子ネジを螺合するナットの回り止め構造に係わる。 The present invention relates to a terminal device of an electronic device intended for a general-purpose inverter device or the like, and more particularly to a nut detent structure in which a terminal screw is screwed into a terminal block made of resin.
頭記のインバータ装置は、その主回路に電源，負荷を接続するための端子装置として、樹脂成型品になるケースの端子台に引出した主回路の導体バーに端子ネジを介して外線ケーブルを接続するようにしており、その構造例として前記端子台に形成したナット挿入穴に六角ナットを嵌め込んで回り止め保持した上で、該六角ナットに前記導体バーに挿通した端子ネジを螺合し、該端子ネジの締め付けにより接続ケーブルを導体バーとの間に挟持圧接するようにした端子装置が知られている（例えば、特許文献１参照）。 The inverter device mentioned above is used as a terminal device for connecting the power supply and load to the main circuit, and an external cable is connected via a terminal screw to the conductor bar of the main circuit drawn out to the terminal block of the case that becomes a resin molded product. As a structural example, a hexagon nut is fitted into a nut insertion hole formed in the terminal block as an example of the structure, and the detent is held, and then a terminal screw inserted through the conductor bar is screwed into the hexagon nut, A terminal device is known in which a connection cable is clamped and pressed between conductor bars by tightening the terminal screw (see, for example, Patent Document 1).
前記端子台に形成したナット挿入穴は、端子ネジを締め付けた際にナットが共回りしないように六角ナットの外形に相似な六角形状であり、ナット挿入の組立性を考慮してあらかじめナット外形よりも一回り大きな寸法（０．５〜０．８mm程度）に設定してナットを嵌め合い保持（緩合）するようにしている（例えば、特許文献２参照）。 The nut insertion hole formed in the terminal block has a hexagonal shape similar to the outer shape of the hexagonal nut so that the nut does not rotate together when the terminal screw is tightened. Is set to be slightly larger (about 0.5 to 0.8 mm), and the nut is fitted and held (loosely fitted) (see, for example, Patent Document 2).
次に、前記構成に基づく従来構造の端子装置を図２，図３に示す。図において１は樹脂成型品になる端子台、２は端子台１の上に引出した主回路の導体バー、３は導体バー２に嵌挿した端子ネジ、３ａは端子ネジ３の座金、４は端子ネジ３に螺合する六角ナット、５は導体バー２に接続する外線ケーブルであり、前記六角ナット４は端子台１の台面に形成した凹状のナット挿入穴６に嵌合して回り止め保持されている。 Next, a conventional terminal device based on the above-described configuration is shown in FIGS. In the figure, 1 is a terminal block to be a resin molded product, 2 is a conductor bar of the main circuit drawn on the terminal block 1, 3 is a terminal screw fitted into the conductor bar 2, 3a is a washer of the terminal screw 3, 4 is Hexagon nuts 5 and 5 are external cables connected to the conductor bar 2, and the hexagonal nuts 4 are fitted in concave nut insertion holes 6 formed on the base surface of the terminal block 1 to hold the rotation. Has been.
ここで、前記ナット挿入穴６は六角ナット４の外形に相似な六角形状の穴であって、図３に示すナット挿入状態でナット挿入穴６と六角ナット４との間にクリアランス（遊び隙間）を確保するように穴の大きさが設定されている。 Here, the nut insertion hole 6 is a hexagonal hole similar to the outer shape of the hexagon nut 4, and a clearance (play gap) is provided between the nut insertion hole 6 and the hexagon nut 4 in the nut insertion state shown in FIG. The hole size is set to ensure
上記の端子装置で導体バー２に外線ケーブル５を接続するには、図示のように外線ケーブル５の端部を前方から導体バー２と該導体バー２に嵌挿した端子ネジ３の座金３ａとの間に差込み、この状態で六角ナット４に螺合した端子ネジ３を工具により締め付けるようにしている。なお，端子台１に形成したナット挿入穴６の上面は導体バー２で塞がれているので、ナット挿入穴６に嵌め込んだ六角ナット４は脱落することはない。 In order to connect the external cable 5 to the conductor bar 2 with the above terminal device, the end of the external cable 5 is connected to the conductor bar 2 and the washer 3a of the terminal screw 3 inserted into the conductor bar 2 from the front as shown in the figure. The terminal screw 3 screwed into the hexagon nut 4 in this state is tightened with a tool. In addition, since the upper surface of the nut insertion hole 6 formed in the terminal block 1 is closed by the conductor bar 2, the hexagon nut 4 fitted in the nut insertion hole 6 does not fall off.
ところで、前記した従来構造の端子装置は、端子台の強度，信頼性の面で次記のような問題点がある。すなわち、端子装置の組立状態で六角ナット４に螺合した端子ネジ３を締め付けると、図３で表すように端子台１のナット挿入穴６に嵌合した六角ナット４は、ナット挿入穴６との間の遊び間隙（クリアランス）により端子ネジ３と共回りして軸中心Ｏの回りを破線位置に回動し、六角ナット４の角部４ａ（エッジ状に尖っている）が端子台１のナット挿入穴６の内周壁面に当たる。この状態で端子ネジ３に加える締め付け力を更に増すと、締め付けトルクにより六角ナット４の角部４ａがナット挿入穴６の内周壁面に食い込み、六角ナットの角部４ａとの当接部Ｐに齧りが発生してナット挿入穴６の壁面に過大な応力が集中的に加わるようになる。 By the way, the above-described conventional terminal device has the following problems in terms of the strength and reliability of the terminal block. That is, when the terminal screw 3 screwed to the hexagon nut 4 is tightened in the assembled state of the terminal device, the hexagon nut 4 fitted into the nut insertion hole 6 of the terminal block 1 is connected to the nut insertion hole 6 as shown in FIG. A clearance gap between the terminal screw 3 and the shaft center O rotates around the axis center O to the position indicated by the broken line. It hits the inner peripheral wall surface of the nut insertion hole 6. When the tightening force applied to the terminal screw 3 is further increased in this state, the corner 4a of the hexagon nut 4 bites into the inner peripheral wall surface of the nut insertion hole 6 due to the tightening torque, and enters the contact portion P with the corner 4a of the hexagon nut. As a result of the twisting, excessive stress is intensively applied to the wall surface of the nut insertion hole 6.
このために、端子ネジ３に大きな締め付けトルクを加えると、六角ナット４の角部４ａとの齧りによって樹脂成型品の端子台１に形成したナット挿入穴６の壁面が削られてナット４が空回りするようになったり、集中応力により端子台１にクラック割れが生じたりして端子装置としての機能が喪失するおそれがある。そこで、従来は端子台１におけるナット挿入穴周辺の肉厚を厚く設計したり、端子ネジ３の締め付けトルクを低めに管理するなどして対応しているのが現状である。しかしながら、ナット挿入穴周辺の肉厚を厚く設計すると、端子台１が大形化するほか、樹脂材料の重量が増してコストアップとなる。また、端子ネジ３の締め付けトルクを低めに管理すると、端子ネジ３の締結力が小さくなってバー導体２に接続した外線ケーブル５が抜け易くなる。 For this reason, when a large tightening torque is applied to the terminal screw 3, the wall surface of the nut insertion hole 6 formed in the terminal block 1 of the resin molded product is scraped by turning with the corner portion 4a of the hexagon nut 4, and the nut 4 becomes idle. There is a risk that the function as a terminal device may be lost due to cracking in the terminal block 1 due to concentrated stress. Therefore, the current situation is that the thickness around the nut insertion hole in the terminal block 1 is designed to be thick, or the tightening torque of the terminal screw 3 is managed to be low. However, if the thickness around the nut insertion hole is designed to be thick, the terminal block 1 is increased in size and the weight of the resin material is increased, resulting in an increase in cost. Moreover, if the tightening torque of the terminal screw 3 is managed to be low, the fastening force of the terminal screw 3 is reduced, and the external cable 5 connected to the bar conductor 2 is easily disconnected.
本発明は上記の点に鑑みなされたものであり、端子台に嵌め込み装着したナットの回り止め構造を改良することにより、前記課題を解消して端子台の強度確保，信頼性向上が図れるようにした電子機器の端子装置を提供することを目的とする。 The present invention has been made in view of the above points, and by improving the structure for preventing the rotation of the nut fitted in and attached to the terminal block, the problems can be solved and the strength and reliability of the terminal block can be secured. An object of the present invention is to provide a terminal device for an electronic device.
上記目的を達成するために、本発明によれば、樹脂成型品になる端子台に引出した導体バーに端子ネジを介して外線ケーブルを接続する電子機器の端子装置であって、前記端子台に形成したナット挿入穴に六角ナットを嵌合して回り止め保持した上で、該六角ナットに前記端子ネジを螺合したものにおいて、前記ナット挿入穴を、六角ナットの外形に相応した六角形の穴形状を基本として該六角穴の各対角部に六角ナットの角部との接触を避ける凹状の逃げ溝を形成した異形穴で形成し、前記凹状の逃げ溝を挟んで六角形状の各辺に六角ナットの周面が当接するように角度付けしたテーパー壁面を形成する。 In order to achieve the above object, according to the present invention, there is provided a terminal device for an electronic device in which an external cable is connected via a terminal screw to a conductor bar drawn out to a terminal block to be a resin molded product. A hexagonal nut is fitted to the formed nut insertion hole and held in place, and the terminal screw is screwed into the hexagonal nut. The nut insertion hole is formed in a hexagonal shape corresponding to the outer shape of the hexagonal nut. Based on the shape of the hole, each hexagonal side of the hexagonal hole is formed with a deformed hole formed with a concave relief groove that avoids contact with the corner of the hexagonal nut at each diagonal part of the hexagonal hole. A tapered wall surface that is angled so that the peripheral surface of the hexagonal nut comes into contact therewith is formed .
上記構成によるナットの回り止め構造によれば、端子装置の組立状態で六角ナットに螺合した端子ネジを締め付け操作する過程で六角ナットが共回りしようとしても、六角ナットの角部はナット挿入穴にあらかじめ形成しておいた凹状の逃げ溝内を非接触のまま変位するだけで、六角ナットの角部がナット挿入穴の壁面に当たって食い込むような齧り現象が発生しない。しかも、端子ネジの締め付け操作により六角ナットが僅かな角度だけ共回りし始めると、六角ナットの角部との干渉なしにナットの平坦な周面がナット挿入穴の各辺に形成したテーパー壁面に当接して六角ナットがこれ以上は回動しないように回り止め保持される。 According to the nut detent structure according to the above configuration, even if the hexagon nut tries to rotate together in the process of tightening the terminal screw that is screwed into the hexagon nut in the assembled state of the terminal device, the corner of the hexagon nut is not inserted into the nut insertion hole. By simply displacing the recessed relief groove formed in advance in a non-contact manner, the bending phenomenon that the corner of the hex nut hits the wall surface of the nut insertion hole does not occur. Moreover, when the hex nut starts to rotate by a slight angle by tightening the terminal screw, the flat peripheral surface of the nut is formed on the tapered wall surface formed on each side of the nut insertion hole without interference with the corner of the hex nut. The hexagon nut is abutted and held so as not to rotate any more.
したがって、この状態から端子ネジに加える締め付けトルクを増しても、六角ナットの角部とナット挿入穴との間には齧りが発生せず、しかもナットの周面とナット挿入穴のテーパー面が面接触状態に重なり合うので、ナット挿入穴の壁面に作用する応力が分散して軽減される。 Therefore, even if the tightening torque applied to the terminal screw is increased from this state, no crease occurs between the corner of the hex nut and the nut insertion hole, and the circumferential surface of the nut and the taper surface of the nut insertion hole are surfaced. Since the contact state overlaps, the stress acting on the wall surface of the nut insertion hole is dispersed and reduced.
これにより、従来構造で問題になっていた六角ナットの空回り，端子台の集中荷重によるクラック割れなどのダメージを回避して端子装置の強度確保，信頼性の向上が図れる。 As a result, it is possible to avoid damage such as idle rotation of the hexagon nut and cracking due to concentrated load on the terminal block, which are problems in the conventional structure, and to ensure the strength of the terminal device and improve the reliability.
以下、本発明の実施の形態を図１（ａ）〜（ｃ）に示す実施例に基づいて説明する。なお、実施例の図中で図２，図３に対応する同一部材には同じ符号を付してその説明は省略する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In the drawings of the embodiment, the same members corresponding to those in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted.
図示実施例の端子装置は基本的に図２の構造と同じであるが、端子台１に形成したナット挿入穴６が次記のような異形形状に形成されている。すなわち、従来の回り止め構造ではナット挿入穴６は図３で示すように六角ナット４の外形に相似な六角穴形状であるのに対して、図１に示す本発明の実施例では、六角ナット４の外形に相応した六角形の穴形状を基本として該六角穴の各対角部には六角ナット４の角部４ａとの接触を避ける凹状の逃げ溝６ａを形成し、さらに前記逃げ溝６ａを挟んで六角形状穴の各辺には、六角ナット４の周面（平坦面）が面接触するように角度付けしたテーパー壁面６ｂ、および６ｃが形成されている。 The terminal device of the illustrated embodiment is basically the same as the structure of FIG. 2, but the nut insertion hole 6 formed in the terminal block 1 is formed in the following irregular shape. That is, in the conventional detent structure, the nut insertion hole 6 has a hexagonal hole shape similar to the outer shape of the hexagonal nut 4 as shown in FIG. 3, whereas in the embodiment of the present invention shown in FIG. On the basis of the hexagonal hole shape corresponding to the outer shape of 4, a concave relief groove 6 a that avoids contact with the corner part 4 a of the hexagon nut 4 is formed at each diagonal part of the hexagonal hole, and the relief groove 6 a Tapered wall surfaces 6b and 6c that are angled so that the peripheral surface (flat surface) of the hexagon nut 4 is in surface contact are formed on each side of the hexagonal hole with respect to each other.
次に、端子台１に形成した図示実施例のナット挿入穴６による回り止め機能，および効果を図１（ａ），（ｂ）で説明する。まず、異形形状のナット挿入穴６に六角ナット４を挿入した嵌め合い状態（図１（ａ）参照）では、六角ナット４の各角部４ａがナット挿入穴６の凹状逃げ溝６ａに遊嵌してナット挿入穴６の内壁面とは離間している。この状態で六角ナット４に螺合した端子ネジ３に締め付け力を加えると（図１（ｂ）参照）、六角ナット４は端子ネジ３と共回りして軸中心Ｏの回りに変位しようとするが、僅かな角度だけ移動（矢印方向）したところで、図示のように六角ナット４の周面（平坦面）がナット挿入穴６の各辺部に角度付けして形成したテーパー壁面６ｂに当たって面接触状態に重なり合うようになる。 Next, the anti-rotation function and effect by the nut insertion hole 6 of the illustrated embodiment formed in the terminal block 1 will be described with reference to FIGS. First, in a fitting state in which the hexagon nut 4 is inserted into the irregularly shaped nut insertion hole 6 (see FIG. 1A), each corner 4a of the hexagon nut 4 is loosely fitted into the concave relief groove 6a of the nut insertion hole 6. Thus, the nut insertion hole 6 is separated from the inner wall surface. When a tightening force is applied to the terminal screw 3 screwed into the hexagon nut 4 in this state (see FIG. 1B), the hexagon nut 4 tries to displace around the axis center O together with the terminal screw 3. However, when it is moved by a slight angle (in the direction of the arrow), the peripheral surface (flat surface) of the hexagon nut 4 hits the tapered wall surface 6b formed by angling each side of the nut insertion hole 6 as shown in the figure, and comes into surface contact. It overlaps with the state.
この状態では、前記テーパー壁面６ｂがナットの共回りを阻止するストッパとして機能し、六角ナット４はこれ以上共回りしないように係止保持される。しかも、六角ナット４の周面とナット挿入穴６のテーパー面６ｂとは面接触しているので、端子台１には端子ネジ３の締め付け応力が分散して集中することがない。なお、この回り止め位置では六角ナット４の角部４ａが前記逃げ溝６ａの領域内に止まっていてナット挿入穴６の壁面とは非接触の状態を維持している。 In this state, the tapered wall surface 6b functions as a stopper that prevents the nut from rotating together, and the hexagonal nut 4 is locked and held so as not to rotate further. Moreover, since the peripheral surface of the hexagon nut 4 and the tapered surface 6b of the nut insertion hole 6 are in surface contact, the fastening stress of the terminal screw 3 is not dispersed and concentrated on the terminal block 1. At this detent position, the corner 4a of the hexagon nut 4 is stopped in the region of the relief groove 6a and is kept in a non-contact state with the wall surface of the nut insertion hole 6.
なお、端子ネジ３を締め付けた締結状態から弛める方向に操作すると、六角ナット４には締め付けと逆方向に端子ネジ３と共回りするような力が加わるが、この場合には六角ナット４の周面がナット挿入穴６の各辺に形成したテーパー壁面６ｃに当接（面接触）したところで六角ナット４のその以上の回動が阻止されるので、角部４ａとの齧り発生を避けつつ端子ネジ３を弛めることができる。 When the terminal screw 3 is operated in the direction of loosening from the tightened state, a force is applied to the hexagon nut 4 so as to rotate together with the terminal screw 3 in the opposite direction to the tightening. Further rotation of the hexagon nut 4 is prevented when the surface comes into contact (surface contact) with the tapered wall surface 6c formed on each side of the nut insertion hole 6, so that the terminal is prevented from being twisted with the corner portion 4a. The screw 3 can be loosened.
これにより、図３で述べた従来形状のナット挿入穴のように、六角ナット４の角部４ａとナット挿入穴６との壁面との当接により生じた齧りが原因で、端子ネジ３を大きな締め付けトルクを加えて締め付けた際にナット挿入穴６の壁面が削られて六角ナット４が空回りしたり、ナット挿入穴６の壁面に加わる集中応力で樹脂成型品の端子台１にクラック割れが生じたりする危惧を未然に防いで端子台１の強度確保，信頼性の向上が図れる。 As a result, the terminal screw 3 is made large due to the curl caused by the contact between the corner 4a of the hexagonal nut 4 and the wall surface of the nut insertion hole 6, like the conventional nut insertion hole described in FIG. When the tightening torque is applied and the nut insertion hole 6 is tightened, the wall surface of the nut insertion hole 6 is scraped and the hexagon nut 4 is idled, or cracks occur in the terminal block 1 of the resin molded product due to concentrated stress applied to the wall surface of the nut insertion hole 6 It is possible to secure the strength of the terminal block 1 and improve the reliability.
そのほか、端子台１の強度面から端子ネジ３の締め付けトルク値を低めに管理する必要もなく、外線ケーブル５を主回路の導体バー３に強固に締結接続することができるほか、従来構造のように六角ナット４の角部４ａとの齧りに起因する集中応力を考慮して端子台１のナット挿入穴周域で樹脂の肉厚を増す必要もなくて樹脂材料費を低減できる効果も得られる。 In addition, it is not necessary to manage the tightening torque value of the terminal screw 3 to be low from the strength aspect of the terminal block 1, and the external cable 5 can be firmly connected to the conductor bar 3 of the main circuit as well as the conventional structure. In addition, in consideration of the concentrated stress caused by the bending of the hexagonal nut 4 with the corner 4a, there is no need to increase the resin thickness in the nut insertion hole peripheral area of the terminal block 1, and the effect of reducing the resin material cost can be obtained. .
なお、本発明は頭記したインバータ装置の端子台への適用に限定されるものではなく、各種電子機器の端子装置にも同様に実施適用できることは勿論である。 Note that the present invention is not limited to application to the terminal block of the inverter device described above, and it is needless to say that the present invention can be similarly applied to terminal devices of various electronic devices.
１ 端子台
２ 導体バー
３ 端子ネジ
４ 六角ナット
４ａ 角部
５ 外線ケーブル
６ ナット挿入穴
６ａ 逃げ溝
６ｂ テーパー面
1 Terminal Block 2 Conductor Bar 3 Terminal Screw 4 Hex Nut 4a Corner 5 External Cable 6 Nut Insertion Hole 6a Escape Groove 6b Tapered Surface
Claims (1)
前記ナット挿入穴を、六角ナットの外形に相応した六角形の穴形状を基本として該六角穴の各対角部に六角ナットの角部との接触を避ける凹状の逃げ溝を形成した異形穴で形成し、前記凹状の逃げ溝を挟んで六角形状の各辺に六角ナットの周面が当接するように角度付けしたテーパー壁面を形成したことを特徴とする電子機器の端子装置。 A terminal device of an electronic device in which an external cable is connected to a conductor bar drawn out to a terminal block to be a resin molded product via a terminal screw, and a hexagonal nut is fitted around a nut insertion hole formed in the terminal block. In the one that the terminal screw is screwed to the hexagon nut after holding and holding,
Based on the hexagonal hole shape corresponding to the outer shape of the hexagonal nut, the nut insertion hole is a deformed hole in which a concave relief groove is formed at each diagonal part of the hexagonal hole to avoid contact with the corner of the hexagonal nut. A terminal device for an electronic device, characterized in that a tapered wall surface is formed and angled so that a peripheral surface of a hexagonal nut comes into contact with each side of the hexagonal shape across the concave relief groove .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011141641A JP5790201B2 (en) | 2011-06-27 | 2011-06-27 | Terminal equipment for electronic equipment |
Applications Claiming Priority (1)
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| JP2011141641A JP5790201B2 (en) | 2011-06-27 | 2011-06-27 | Terminal equipment for electronic equipment |
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| JP5790201B2 true JP5790201B2 (en) | 2015-10-07 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981944B (en) * | 2013-03-15 | 2017-05-31 | 三菱电机株式会社 | The terminal construction and terminal method for selecting of terminal construction and circuit-breaker |
| JP6118206B2 (en) * | 2013-07-26 | 2017-04-19 | 矢崎総業株式会社 | Nut press-fit holding structure |
| WO2015109280A1 (en) * | 2014-01-17 | 2015-07-23 | Molex Incorporated | Terminal strip |
| JP6683266B2 (en) | 2017-01-17 | 2020-04-15 | 富士電機株式会社 | Semiconductor device |
| JP6943712B2 (en) * | 2017-09-29 | 2021-10-06 | ダイハツ工業株式会社 | Case nut structure |
| JP7275493B2 (en) * | 2018-08-07 | 2023-05-18 | 富士電機株式会社 | semiconductor equipment |
| JP7124799B2 (en) * | 2019-07-09 | 2022-08-24 | 住友電装株式会社 | connector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0741095Y2 (en) * | 1990-05-11 | 1995-09-20 | 三菱電機株式会社 | Structure of the external connection terminal of the circuit protector |
| JP4443691B2 (en) * | 1999-10-18 | 2010-03-31 | 第一電子工業株式会社 | Terminal block |
| JP3864130B2 (en) * | 2002-10-10 | 2006-12-27 | 三菱電機株式会社 | Power semiconductor device |
| JP4118789B2 (en) * | 2003-11-25 | 2008-07-16 | 三菱電機株式会社 | Exterior resin case for semiconductor devices |
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