JP4139262B2

JP4139262B2 - Torque limiter

Info

Publication number: JP4139262B2
Application number: JP2003110850A
Authority: JP
Inventors: 堅二安孫子; 睦 ▲高▼階; 英明橋本; 康晴永木; 保岩間
Original assignee: Tohoku Electric Power Co Inc; Nagaki Seiki Co Ltd
Current assignee: Tohoku Electric Power Co Inc; Nagaki Seiki Co Ltd
Priority date: 2003-04-15
Filing date: 2003-04-15
Publication date: 2008-08-27
Anticipated expiration: 2023-04-15
Also published as: JP2004316763A

Description

【０００１】
【発明の属する技術分野】
本発明は、回転駆動源の回転力を被作動回転機構に一体回転可能に伝達するとともに、被作動回転機構の回転トルクが上昇して所定値に達した時点で回転駆動源と被作動回転機構とを自動的に切り離して回転伝達を遮断するよう機能するトルクリミッタに関するものである。
【０００２】
【従来の技術】
従来、駆動軸に取付けたカム部材に１対のカム溝を設けると共に、ワーク把持用の１対のジョー部材にそれぞれ上記カム溝に嵌合する駆動ピンを設け、駆動軸の回転揺動運動をこれらのカム部材と駆動ピンとジョー部材の開閉運動に変換する電動ハンドにおいて、上記駆動軸と上記カム部材との間に、それらを摩擦力で連結する摩擦板を供えたトルクリミッタを設け、カム部材に伝達される駆動軸３ａのトルクを上記トルクリミッタで制限するものが知られている（特許文献１参照）。
【０００３】
【特許文献１】
特開２００１−２３９４９１号公報
【０００４】
【発明が解決しようとする課題】
しかし上記従来例では、被作動回転装置の回転トルクが所定値に達した時点で正確に回転伝達を遮断できる高い精度と、回転伝達の遮断後に回転駆動源を円滑に空回りさせることによって得られる高い耐久性とを備えることが困難である。
【０００５】
そこで、本発明は、上記従来の課題に鑑みてなされたもので、高精度で高い耐久性を有するトルクリミッタを提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明に係るトルクリミッタは、回転駆動源に連結されて、これと一体回転する回転受動部と、被作動回転機構に連結されて、これを一体回転させる回転伝達部と、前記回転受動部と前記回転伝達部とを一体回転可能に連結し、且つ前記回転伝達部の回転トルクが設定値まで上昇した時点で前記回転受動部から前記回転伝達部への回転伝達を自動的に遮断する回転伝達遮断部とを備え、前記回転受動部が、回転伝達端面に係止凹部が設けられて前記回転駆動源に一体回転するよう連結された回転ブロック体を有し、前記回転伝達遮断部が、回転自在に取り付けられて前記係止凹部に嵌まり込んだ転動輪を介し前記回転受動部に一体回転するよう連結される受動ブロック体と、この受動ブロック体を付勢して前記転動輪を係止凹部内に保持させる弾性体と、前記受動ブロック体に対し一体回転可能に連設され、且つ先端部に前記回転伝達部が一体回転可能に連結されるとともに前記弾性体の付勢力に抗して前記転動輪が前記係止凹部から抜け出たのち前記回転伝達端面上に転動状態で圧接する方向に移動可能に保持された支持軸体とを有し、前記回転ブロック体の回転伝達端面はその軸芯方向に円形の受け孔が穿設され、前記受動ブロック体はその軸芯方向に前記受け孔に回転自在かつ摺動自在に支持される支持軸を有し、かつ、前記回転ブロック体の回転伝達端面の前記受け孔と外周端との間に前記係止凹部が形成され、前記受動ブロック体に前記軸芯方向に直交する方向に突出するように設けた１本の支軸に前記転動輪を回転自在に取り付けていることを特徴としている。
【０００７】
このトルクリミッタでは、通常時に、弾性体の付勢力により転動輪が係止凹部に嵌まり込んだ状態に押し付けられて、回転受動部と回転伝達遮断部とが一体回転する状態に連結されているが、被作動回転機構の回転トルクが大きくなって予め設定された所定値に達した場合、転動輪が、係止凹部に対し係合状態を保持できなくなって係止凹部から押し出されたのち回転ブロック体の回転伝達端面に圧接されるとともに、この転動輪が取り付けられている受動ブロック体が弾性体の付勢力に抗して回転伝達部に向けた方向に移動され、これにより、回転受動部から回転伝達遮断部への回転伝達が遮断され、回転受動部が空回りし続ける。
【０００８】
回転伝達の遮断時には、転動輪が回転を継続する回転受動部の回転ブロック体の回転伝達端面に対し転動しながら圧接し、且つ回転ブロックの１回転当たり１回だけ係止凹部に落ち込む動作をするので、回転受動部は、回転伝達遮断部から大きな荷重を受けることなしに無理なく空回りできる。そのため、回転伝達を遮断したあとの回転受動部の空回り動作が、何れの個所にも無理な力が作用することなしに極めてスムーズに行われることから、高い耐久性を有したものとなる。また、このトルクリミッタでは、転動輪と係合凹部との係合度合いおよび弾性体の付勢力により、回転伝達を遮断するための回転トルクである遮断値を設定するので、被作動回転機構の回転トルクが所定値に達した時点で正確に回転伝達を遮断できる高精度なものとなる。さらに、このトルクリミッタでは、互いに係合する係止凹部および転動輪と、転動輪を係止凹部内に押し付ける弾性体とのみからなる簡単な構成により、回転伝達を遮断するための回転トルクの検出と、回転力の伝達および遮断との各機能を具備するようになっているので、全体構成が格段にコンパクトとなり、構成の簡素化に伴い安価なものとなる利点がある。
【０００９】
上記発明のトルクリミッタにおいて、回転伝達遮断部の弾性体が、支持軸体に挿通された圧縮コイルスプリングからなり、一端部が回転受動部の回転ブロック体に固着され、且つ他端部内周面に雌ねじ部が形成された連結筒体と、回転操作部と外周面に形成された雄ねじ部とを有して回転伝達遮断部の支持軸体に回転自在に装着され、且つ前記雄ねじ部が前記雌ねじ部に螺合されて前記圧縮コイルスプリングを受動ブロック体に押し付ける遮断値設定部材と、前記遮断値設定部材と前記圧縮コイルスプリングとの間に介在されたスラストベアリングとを備え、前記遮断値設定部材を前記回転操作部による回転操作により前記圧縮コイルスプリングに対し接離する方向に移動させることにより、前記圧縮コイルスプリングにおける転動体を係止凹部に押し付けるばね力を可変調整できるように構成されていることが好ましい。
【００１０】
この構成によれば、回転操作部により遮断値設定部材を回転操作することにより、連結筒体の雌ねじ部に螺合する遮断値設定部材の雄ねじ部を圧縮コイルスプリングに対し接離する方向に螺進させれば、圧縮コイルスプリングのばね力、つまり回転伝達を遮断するための回転トルクである遮断値を任意に可変設定することができる。そのため、このトルクリミッタでは、取り付ける機器などに対応して回転伝達の遮断値を適宜変更することができるから、適用範囲が広いものとなる。しかも、回転伝達が遮断されたときに、回転継続する回転受動部の遮断値設定部材の回転力は、スラストベアリングの回転により吸収されて、回転伝達遮断部の圧縮コイルスプリングに殆ど伝達されないので、圧縮コイルスプリングに歪みなどが生じることがないとともに、大きな騒音が発生することもない。これにより、回転受動部は回転伝達遮断部から過大な回転停止力を受けることなしに一層円滑に空回りし続けることができる。
【００１１】
上記発明のトルクリミッタにおいて、回転伝達遮断部の支持軸体と回転伝達部の回転伝達体とが、各々の対向面間に電気絶縁部材を介在して、電気絶縁素材からなる連結部材によって一体回転可能に相互に連結されている構成を備えていることが好ましい。
【００１２】
この構成によれば、例えば間接活線作業で電設工事を行う間接作業工具や配線作業用マニピュレータにおける回転駆動部と被作動回転部との間に介設すれば、回転駆動部と被作動回転部とを電気絶縁した状態で回転駆動部の回転力をそのまま被作動回転部に伝達することができ、間接作業工具や配線作業用マニピュレータに極めて好適に用いることができる。
【００１３】
【発明の実施の形態】
以下、本発明の好ましい実施の形態について図面を参照しながら説明する。図１は、本発明の一実施の形態に係るトルクリミッタを示す縦断面図である。このトルクリミッタは、回転駆動装置５０に連結されて、この回転駆動装置５０と一体回転する回転受動部１と、被作動回転装置５１に連結されて、この被作動回転装置５１を一体回転させる回転伝達部３と、回転受動部１と回転伝達部３とを一体回転可能に連結し、且つ回転伝達部３の回転トルクが設定値まで上昇した時点で回転伝達部３を回転受動部１から自動的に切り離して回転伝達を遮断する回転伝達遮断部２とを備えて構成されている。
【００１４】
上記回転受動部１は、回転駆動装置５０の連結部５０ａが外嵌して連結される入力側保持筒体４と、この入力側保持筒体４にニードルベアリング（ラジアル軸受）７および前後２つのスラスト軸受輪８，９を介して回転自在に保持された回転ブロック体１０と、この回転ブロック体１０にスプリングピン１１によって一体的に連結された断面六角形の入力軸部１２と、一端部（図の左端部）が入力側保持筒体４にねじ結合され、且つかしめピン１４により入力側保持筒体４に固定された連結筒体１３と、この連結筒体１３の他端部（図の右端部）の内周面に形成された雌ねじ部１３ａに自体の雄ねじ部１７ａを螺合して取り付けられた遮断値設定部材１７とを備えて構成されている。この遮断値設定部材１７の外側面（図の右方面）には回転操作用孔１７ｂが形成されている。また、上記入力軸部１２には、回転駆動装置５０の回転出力部５０ｂが外嵌して一体回転できるように連結される。
【００１５】
図３（ａ），（ｂ）はそれぞれ上記回転ブロック体１０を示す斜視図および図１の右方から見た背面図である。この回転ブロック体１０における回転伝達遮断部２に対向する回転伝達端面１０ｂには、その中央部に円形の受け孔１８が穿設されているとともに、この受け孔１８と外周端との間の個所に略長方形の係止凹部１９が形成されている。また、この回転ブロック体１０の外周面には連結筒体１３の雌ねじ部１３ｂ（図１）にねじ結合する雄ねじ部１０ａが形成されている。受け孔１８および係止凹部１９の詳細については後述する。
【００１６】
上記回転伝達遮断部２は、図１に加えて図２にも示すように、この回転伝達遮断部２の基部である略円盤状の受動ブロック体２０と、この受動ブロック体２０における円盤状の一部をカットした平坦面に形成された平坦な取付面２０ａに受動ブロック体２０から一部突出した配置で支軸２１により回転自在に取り付けられた転動輪２２と、受動ブロック体２０の一面から後方（図１の右方）に一体に延設された支持軸体２３と、受動ブロック体２０の他面中央から前方（図１の左方）へ突設された支持軸２４と、上記支持軸体２３が挿通されて受動ブロック体２０と遮断値設定部材１７との間に介設された圧縮コイルスプリング（弾性体）２７と、この圧縮コイルスプリング２７と受動ブロック体２０との間に介在されたスラスト軸受輪２８と、角形ばね３０およびスラスト軸受輪２８を両面側に配して圧縮コイルスプリング２７と遮断値設定部材１７との間に介設されたスラストベアリング２９とを備えて構成されている。
【００１７】
上記受動ブロック体２０の支持軸２４は、回転ブロック体１０の受け孔１８に回転自在、且つ摺動自在に支持されているとともに、同受動ブロック体２０の支持軸体２３の先端部分は、遮断値設定部材１７の支持孔１７ｃに挿通されて回転自在、且つ摺動自在に支持されている。したがって、上記受動ブロック体２０は、支持軸２４および支持軸体２３を介して回転ブロック体１０と遮断値設定部材１７とに回転自在、且つ軸心方向に移動可能に支持されている。また、回転伝達遮断部２は、受動ブロック体２０および支持軸体２３が圧縮コイルスプリング２７のバネ力により回転受動部１に向けた方向に付勢されていることにより、通常時に転動輪２２が係止凹部１９に嵌まり込んだ状態に押し付けられている。したがって、通常時には、この係止凹部１９と転動輪２２との係合を介して回転伝達遮断部２が回転受動部１の回転を伝達されて一体回転するようになっている。
【００１８】
図１において、上記回転伝達部３は、一端部が入力側保持筒体４に固定ねじ３３により固着された合成樹脂製の外装筒体３２の他端部に固定ねじ３３により固着された出力側保持筒体３４と、この出力側保持筒体３４の前方部分（図１の左方部分）に内嵌されて回転自在、且つ摺動自在に保持された回転伝達体３７と、両端部が回転伝達遮断部２の支持軸体２３および回転伝達体３７に対しそれぞれ外嵌されてかしめピン３９により一体化され、支持軸体２３と回転伝達体３７とを一体回転するよう連結する円筒状の連結部材３８と、連結部材３８の内部における支持軸体２３と回転伝達体３７との間に配設された絶縁部材４０と、出力側保持筒体３４の内部に配設されて回転伝達体３７を図１の左方に付勢する復帰用コイルスプリング４１と、出力側保持筒体３４の内部に挿入された被作動回転装置５１を出力側保持筒体３４に固定する固定部材４２とを備えて構成されている。
【００１９】
連結部材３８は、電気絶縁性素材、例えば変成ＦＲＰを素材として円筒状に形成されており、絶縁部材４０も、電気絶縁性素材、例えば変成シリコーンシーライトを素材として形成されている。したがって、上記回転伝達部３は、連結部材３８および絶縁部材４０により回転伝達遮断部２に対し電気絶縁された状態で設けられているとともに、樹脂製の外装筒体３２により回転受動部１に対し電気絶縁された状態で設けられている。
【００２０】
上記回転伝達部３は、被作動回転装置５１の連結部が出力側保持筒体３４に挿入され、且つその被作動回転装置５１の被作動軸部が回転伝達体３７に形成された六角形状の連結孔部３７ｂに嵌合され、さらに固定部材４２が締結されることにより、被作動回転装置５１に対し一体回転可能に連結される。
【００２１】
つぎに、上記トルクリミッタの作用について説明する。このトルクリミッタは、回転受動部１が上述のようにして回転駆動装置５０に一体回転可能に連結され、且つ回転伝達部３が上述のようにして被作動回転装置５１に一体回転可能に連結して装着される。そして、回転駆動装置５０が回転駆動されると、この回転駆動装置５０の回転が入力軸部１２に伝達されて、回転受動部１の他の回転ブロック体１０および遮断値設定部材１７も入力軸部１２と一体回転される。
【００２２】
通常時には、圧縮コイルスプリング２７の付勢力により転動輪２２が係止凹部１９に嵌まり込んだ状態に押し付けられていることにより、回転受動部１と回転伝達遮断部２とが一体回転する状態に連結されている。この回転受動部１と一体回転する回転伝達遮断部２の回転は、連結部材３８を介して回転伝達体３７に伝達され、さらに、回転伝達体３７に連結されている被作動回転装置５１に伝達される。すなわち、回転駆動装置５０の回転力は上記トルクリミッタを介して被作動回転装置５１に伝達される。
【００２３】
そして、被作動回転装置５１の回転トルクが大きくなって予め設定された所定値に達した場合、つまり上記回転トルクが転動輪２２と係止凹部１９とを係合させるための保持力を上回った場合には、図５に示すように、転動輪２２が、回転する回転ブロック体１０の係止凹部１９に対し係合状態を保持できなくなって係止凹部１９から押し出されたのち回転ブロック体１０の回転伝達端面１０ｂに圧接されるとともに、この転動輪２２が取り付けられている受動ブロック体２０が圧縮コイルスプリング２７をさらに圧縮させながら矢印で示す回転伝達部３に向けた方向に移動される。これにより、回転受動部１から回転伝達遮断部２への回転伝達は遮断され、回転受動部１は空回りし続ける。
【００２４】
上記受動ブロック体２０および支持軸体２３の移動時には、回転伝達部３の回転伝達体３７も連結部材３８を介して回転伝達遮断部２と一体的に移動されるが、図１に示す回転伝達体３７の鍔部３７ａと出力側保持筒体３４との隙間ｄ１および回転伝達体３７の先端部と出力側保持筒体３４の内面の凹部との隙間ｄ２は、それぞれ上記回転伝達体３７の移動距離よりも大きく設定されているので、回転伝達体３７が支障なく移動できる。
【００２５】
このとき、転動輪２２は、回転を継続する回転受動部１の回転ブロック体１０の回転伝達端面１０ｂに対し転動しながら圧接し、且つ回転ブロック体１０の１回転当たり１回だけ係止凹部１９に落ち込む動作をするので、回転駆動装置５０と共に一体回転を継続する回転受動部１は、大きな荷重を受けることなしに空回りできる。また、回転継続する回転受動部１の遮断値設定部材１７の回転力は、角形ばね３０およびスラスト軸受輪３１を両面側に配したスラストベアリング２９の回転により吸収されて、回転伝達遮断部２の圧縮コイルスプリング２７に殆ど伝達されないので、圧縮コイルスプリング２７に歪みなどが生じることがないとともに、大きな騒音が発生することもない。これによっても回転受動部１は回転伝達遮断部２から過大な回転停止力を受けることなしに円滑に空回りし続ける。したがって、このトルクリミッタでは、回転伝達を遮断したあとの回転受動部１の空回り動作が、何れの個所にも無理な力が作用することなしに極めてスムーズに行われることから、高い耐久性を有したものとなる。
【００２６】
また、このトルクリミッタでは、回転伝達を遮断するための閾値となる回転トルクが、圧縮コイルスプリング２７のばね力と、図４に示すように係止凹部１９の深さおよび係止凹部１９と転動輪２２の圧接個所の数（この実施の形態では３点の圧接個所Ｐ１〜Ｐ３を設定する場合を例示）とによって設定できるが、この実施の形態では、主として圧縮コイルスプリング２７のばね力によって設定するようになっている。そのため、図４に明示するように、係止凹部１９は小さな深さとすることができ、これにより、回転伝達の遮断時の転動輪２２の転動動作が一層円滑に行われる。
【００２７】
また、このトルクリミッタでは、回転操作用孔１７ｂに工具を挿入して遮断値設定用部材１７を回転操作することにより、連結筒体１３の雌ねじ部１３ａに螺合する遮断値設定部材１７の雄ねじ部１７ａを圧縮コイルスプリング２７に対し接離する方向に螺進させれば、圧縮コイルスプリング２７のばね力、つまり回転伝達を遮断するための回転トルクである遮断値を任意に可変設定することができる。しかも、上述したように、遮断値設定部材１７の回転力は、スラストベアリング２９の回転により吸収されて圧縮コイルスプリング２７に殆ど伝達されないので、圧縮コイルスプリング２７のばね力を大きく設定した場合にも回転受動部１に支障が生じない。そのため、このトルクリミッタでは、取り付ける機器などに対応して回転伝達の遮断値を適宜変更することができるから、適用範囲が広いものとなる。
【００２８】
さらに、このトルクリミッタでは、互いに係合する係止凹部１９および転動輪２２と、転動輪２２を係止凹部１９内に押し付ける圧縮コイルスプリング２７とのみからなる簡単な構成により、回転伝達を遮断するための回転トルクの検出と、回転力の伝達および遮断との各機能を具備するようになっているので、全体構成が格段にコンパクトになるとともに、構成の簡素化に伴い安価なものとなる利点がある。
【００２９】
また、このトルクリミッタでは、回転伝達部３が、連結部材３８および絶縁部材４０とにより回転伝達遮断部２に対し電気絶縁状態に設けられているとともに、樹脂製の外装筒体３２により回転受動部１に対しても電気絶縁状態に設けられているので、回転駆動装置５０と被作動回転装置５１とを電気絶縁して回転伝達する必要がある用途に好適に適用することができる。例えば、このトルクリミッタは、通電した活線状態の高圧線に対して遠隔操作による間接活線作業で電設工事を行う、いわゆる「ホットステック工法」に用いられる間接作業工具や配線作業用マニピュレータ（ロボット）における回転駆動部と被作業回転部との間に介設すれば、回転駆動部と被作動回転部とを電気絶縁した状態で回転駆動部の回転力をそのまま被作動回転部に伝達することができるとともに、被作動回転部が過負荷状態となった時点で回転駆動部から被作動回転部への回転伝達を自動的に遮断するように作動させることができる。
【００３０】
【発明の効果】
以上のように本発明のトルクリミッタによれば、回転伝達の遮断時に、転動輪の転動により回転受動部が回転伝達遮断部から大きな荷重を受けることなしに無理なく空回りできるため、回転伝達を遮断したあとの回転受動部の空回り動作が、何れの個所にも無理な力が作用することなしに極めてスムーズに行われることから、高い耐久性を有したものとなる。また、回転伝達を遮断するための回転トルクである遮断値は、転動輪と係合凹部との係合度合いおよび弾性体の付勢力により設定するようになっているので、被作動回転機構の回転トルクが所定値に達した時点で正確に回転伝達を遮断できる高精度なものとなる。さらに、このトルクリミッタでは、互いに係合する係止凹部および転動輪と、転動輪を係止凹部内に押し付ける弾性体とのみからなる簡単な構成により、回転伝達を遮断するための回転トルクの検出と、回転力の伝達および遮断との各機能を具備するようになっているので、全体構成が格段にコンパクトとなり、構成の簡素化に伴い安価なものとなる利点がある。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係るトルクリミッタを示す縦断面図。
【図２】同上のトルクリミッタにおける回転伝達遮断部を示す斜視図。
【図３】（ａ），（ｂ）はそれぞれ同上のトルクリミッタにおける回転ブロック体を示す斜視図および図１の右方から見た背面図。
【図４】同上のトルクリミッタにおける一部の拡大図。
【図５】同上のトルクリミッタにおける回転伝達が遮断された状態を示す縦断面図。
【符号の説明】
１回転受動部
２回転伝達遮断部
３回転伝達部
１０回転ブロック体
１０ｂ回転伝達端面
１３連結筒体
１３ａ雌ねじ部
１７遮断値設定部材
１７ａ雄ねじ部
１７ｂ回転操作用孔（回転操作部）
１９係止凹部
２０受動ブロック体
２２転動輪
２３支持軸体
２７圧縮コイルスプリング（弾性体）
３７回転伝達体
５０回転駆動装置（回転駆動源）
５１被作動回転装置（被作動回転機構）[0001]
BACKGROUND OF THE INVENTION
The present invention transmits the rotational force of the rotational drive source to the actuated rotating mechanism so as to be integrally rotatable, and when the rotational torque of the actuated rotating mechanism increases and reaches a predetermined value, the rotational drive source and the actuated rotating mechanism And a torque limiter that functions to cut off the rotation transmission automatically.
[0002]
[Prior art]
Conventionally, a pair of cam grooves are provided in a cam member attached to a drive shaft, and a drive pin that fits into each cam groove is provided in a pair of jaw members for gripping a workpiece, thereby rotating and swinging the drive shaft. In the electric hand for converting the cam member, the drive pin, and the jaw member into an opening / closing motion, a torque limiter provided with a friction plate for connecting the drive shaft and the cam member with a frictional force is provided between the drive shaft and the cam member. There is known one in which the torque of the drive shaft 3a transmitted to the motor is limited by the torque limiter (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-239491
[Problems to be solved by the invention]
However, in the above-described conventional example, high accuracy that can accurately interrupt the rotation transmission when the rotational torque of the actuated rotating device reaches a predetermined value, and high obtained by smoothly idling the rotation drive source after the rotation transmission is interrupted. It is difficult to provide durability.
[0005]
Accordingly, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a torque limiter having high accuracy and high durability.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a torque limiter according to the present invention is connected to a rotational drive source, and a rotation passive unit that rotates integrally therewith, and a rotation transmission that is coupled to an actuated rotating mechanism and rotates the unit integrally. , The rotation passive part and the rotation transmission part are connected so as to be integrally rotatable, and when the rotational torque of the rotation transmission part rises to a set value, the rotation transmission from the rotation passive part to the rotation transmission part A rotation block body that is connected to the rotation driving source so as to rotate integrally with the rotation transmission end surface. The rotation transmission blocking portion is rotatably attached to a passive block body connected to the rotation passive portion via a rolling wheel fitted in the locking recess, and urges the passive block body. Then An elastic body for holding the ring in the locking recess, and a continuous rotation with the passive block body so as to be integrally rotatable, and the rotation transmitting portion is connected to the tip portion so as to be integrally rotatable, and the urging force of the elastic body And a support shaft body that is held so as to be movable in a rolling contact state on the rotation transmission end surface after the rolling wheel has come out of the locking recess and the rotation of the rotating block body. The transmission end surface has a circular receiving hole in its axial direction, and the passive block body has a support shaft that is rotatably and slidably supported in the receiving hole in its axial direction, and The locking recess is formed between the receiving hole and the outer peripheral end of the rotation transmission end face of the rotating block body, and one support provided so as to protrude in the direction perpendicular to the axial direction of the passive block body. the rolling wheel to be rotatably attached to the shaft Iruko It is characterized in.
[0007]
In this torque limiter, normally, the rolling wheel is pressed into a state where it is fitted in the locking recess by the urging force of the elastic body, and the rotation passive portion and the rotation transmission blocking portion are connected to rotate integrally. However, when the rotational torque of the actuated rotating mechanism increases and reaches a preset value, the rolling wheel can no longer hold the engaged state with respect to the locking recess and rotates after being pushed out of the locking recess. The passive block body to which the rolling wheel is attached is moved in the direction toward the rotation transmission section against the urging force of the elastic body, and is pressed against the rotation transmission end surface of the block body. The rotation transmission from the rotation transmission blocking unit to the rotation transmission blocking unit is blocked, and the rotation passive unit continues to idle.
[0008]
When the rotation transmission is interrupted, the rolling wheel is pressed against the rotation transmission end surface of the rotary block body of the rotary passive part that continues to rotate while being rolled, and falls into the locking recess only once per rotation of the rotary block. Therefore, the rotation passive portion can idle freely without receiving a large load from the rotation transmission blocking portion. Therefore, since the idling operation of the rotation passive part after the rotation transmission is interrupted is performed very smoothly without any excessive force acting on any part, it has high durability. Further, in this torque limiter, a cutoff value, which is a rotational torque for interrupting rotation transmission, is set based on the degree of engagement between the rolling wheels and the engagement recess and the biasing force of the elastic body. When the torque reaches a predetermined value, the rotation transmission can be accurately interrupted. Further, in this torque limiter, rotation torque detection for blocking rotation transmission is achieved with a simple configuration comprising only a locking recess and a rolling wheel that engage with each other, and an elastic body that presses the rolling wheel into the locking recess. In addition, since each function of transmitting and interrupting the rotational force is provided, there is an advantage that the entire configuration is remarkably compact, and the cost is reduced as the configuration is simplified.
[0009]
In the torque limiter of the above invention, the elastic body of the rotation transmission blocking portion is composed of a compression coil spring inserted into the support shaft body, one end portion is fixed to the rotating block body of the rotation passive portion, and the other end portion on the inner peripheral surface. A connecting cylinder having a female threaded portion; a rotation operating portion; and a male threaded portion formed on an outer peripheral surface. The connecting cylindrical body is rotatably mounted on a support shaft body of a rotation transmission blocking unit, and the male threaded portion is the female screw. A cut-off value setting member that is screwed into a portion and presses the compression coil spring against the passive block body, and a thrust bearing interposed between the cut-off value setting member and the compression coil spring, and the cut-off value setting member The rolling element in the compression coil spring is locked by moving it in the direction of contact with and separating from the compression coil spring by the rotation operation by the rotation operation unit. It is preferably configured so that a spring force for pressing the parts can be variably adjusted.
[0010]
According to this configuration, when the cutoff value setting member is rotated by the rotation operation portion, the male screw portion of the cutoff value setting member that is screwed into the female screw portion of the connecting cylinder is screwed in a direction in which the male screw portion is brought into contact with and separated from the compression coil spring. If advanced, the spring force of the compression coil spring, that is, the cutoff value that is the rotational torque for interrupting the rotation transmission can be arbitrarily variably set. Therefore, in this torque limiter, the cutoff value of the rotation transmission can be changed as appropriate in accordance with the device to be attached, so that the applicable range is wide. In addition, when the rotation transmission is interrupted, the rotational force of the cutoff value setting member of the rotation passive part that continues to rotate is absorbed by the rotation of the thrust bearing and is hardly transmitted to the compression coil spring of the rotation transmission interruption part. The compression coil spring is not distorted and no loud noise is generated. Thereby, the rotation passive part can continue idling more smoothly, without receiving excessive rotation stop force from a rotation transmission interruption | blocking part.
[0011]
In the torque limiter of the above invention, the support shaft body of the rotation transmission blocking portion and the rotation transmission body of the rotation transmission portion are integrally rotated by a connecting member made of an electrically insulating material with an electrical insulating member interposed between the opposing surfaces. It is preferable to have a structure that is connected to each other.
[0012]
According to this configuration, for example, if an indirect work tool that performs electrical installation work by indirect hot line work or a manipulator for wiring work is interposed between the rotary drive part and the driven rotary part, the rotary drive part and the driven rotary part The rotational force of the rotary drive unit can be transmitted as it is to the actuated rotary unit while being electrically insulated from each other, and can be used very suitably for an indirect work tool or a wiring work manipulator.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a torque limiter according to an embodiment of the present invention. The torque limiter is connected to the rotation drive device 50, and is connected to the rotary passive unit 1 that rotates integrally with the rotation drive device 50, and the driven rotation device 51, and rotates to rotate the driven rotation device 51 integrally. The transmission unit 3, the rotation passive unit 1 and the rotation transmission unit 3 are connected so as to be integrally rotatable, and the rotation transmission unit 3 is automatically moved from the rotation passive unit 1 when the rotation torque of the rotation transmission unit 3 rises to a set value. And a rotation transmission cut-off section 2 that cuts off rotation transmission and cuts off rotation transmission.
[0014]
The rotary passive unit 1 includes an input-side holding cylinder 4 to which the connecting part 50a of the rotation driving device 50 is externally fitted and connected, and the input-side holding cylinder 4 with a needle bearing (radial bearing) 7 and two front and rear parts. A rotating block body 10 rotatably held through thrust bearing wheels 8 and 9, an input shaft portion 12 having a hexagonal cross section integrally connected to the rotating block body 10 by a spring pin 11, and one end portion ( The connecting cylinder 13 is screwed to the input-side holding cylinder 4 and is fixed to the input-side holding cylinder 4 by a caulking pin 14, and the other end of the connecting cylinder 13 (in the figure). The cut-off value setting member 17 is attached to the internal thread portion 13a formed on the inner peripheral surface of the right end portion by screwing the external thread portion 17a. A rotation operation hole 17b is formed on the outer side surface (right side in the figure) of the cutoff value setting member 17. The input shaft portion 12 is connected so that the rotation output portion 50b of the rotation driving device 50 can be externally fitted and integrally rotated.
[0015]
FIGS. 3A and 3B are a perspective view showing the rotating block body 10 and a rear view as seen from the right side of FIG. A circular receiving hole 18 is formed in the central portion of the rotation transmission end face 10b of the rotating block body 10 facing the rotation transmission blocking portion 2, and a portion between the receiving hole 18 and the outer peripheral end. A substantially rectangular locking recess 19 is formed on the top. Further, a male screw portion 10 a that is screw-coupled to a female screw portion 13 b (FIG. 1) of the connecting cylinder 13 is formed on the outer peripheral surface of the rotating block body 10. Details of the receiving hole 18 and the locking recess 19 will be described later.
[0016]
As shown in FIG. 2 in addition to FIG. 1, the rotation transmission blocking unit 2 includes a substantially disk-shaped passive block body 20 that is the base of the rotation transmission blocking unit 2, and a disk-shaped passive block body 20. From one surface of the passive block body 20, a rolling wheel 22 rotatably mounted by a support shaft 21 in an arrangement partially protruding from the passive block body 20 on a flat mounting surface 20 a formed on a partially cut flat surface. A support shaft 23 integrally extending rearward (right side in FIG. 1), a support shaft 24 projecting forward (leftward in FIG. 1) from the center of the other surface of the passive block body 20, and the above support A compression coil spring (elastic body) 27 interposed between the passive block body 20 and the cutoff value setting member 17 through which the shaft body 23 is inserted, and interposed between the compression coil spring 27 and the passive block body 20. Thrust bearing ring 28 Is constituted by a thrust bearing 29 is interposed between the compression coil spring 27 arranged rectangular spring 30 and a thrust bearing race 28 on both sides and cut-off value setting member 17.
[0017]
The support shaft 24 of the passive block body 20 is rotatably and slidably supported in the receiving hole 18 of the rotary block body 10, and the tip portion of the support shaft body 23 of the passive block body 20 is blocked. The value setting member 17 is inserted into the support hole 17c and supported rotatably and slidably. Therefore, the passive block body 20 is supported by the rotary block body 10 and the cutoff value setting member 17 via the support shaft 24 and the support shaft body 23 so as to be rotatable and movable in the axial direction. Further, the rotation transmission blocking unit 2 is configured such that the rolling wheel 22 is normally moved by the passive block body 20 and the support shaft body 23 being urged in the direction toward the rotation passive unit 1 by the spring force of the compression coil spring 27. It is pressed into a state of being fitted into the locking recess 19. Therefore, in a normal state, the rotation transmission blocking portion 2 is rotated integrally with the rotation of the rotation passive portion 1 through the engagement between the locking recess 19 and the rolling wheel 22.
[0018]
In FIG. 1, the rotation transmission unit 3 has an output side fixed to the other end of a synthetic resin outer cylinder 32 fixed at one end to the input side holding cylinder 4 by a fixing screw 33. A holding cylinder 34, a rotation transmission body 37 that is fitted in a front portion (left portion in FIG. 1) of the output side holding cylinder 34, is rotatably and slidably held, and both end portions are rotated. Cylindrical coupling that is externally fitted to the support shaft body 23 and the rotation transmission body 37 of the transmission blocking portion 2 and integrated by a caulking pin 39 to connect the support shaft body 23 and the rotation transmission body 37 so as to rotate together. The member 38, the insulating member 40 disposed between the support shaft body 23 and the rotation transmission body 37 inside the coupling member 38, and the rotation transmission body 37 disposed inside the output-side holding cylinder 34. Returning coil spring 41 biased to the left in FIG. It is constructed by a fixing member 42 for fixing the object to be actuated rotating device 51 which is inserted in the output side holding cylinder 34 on the output side holding cylinder 34.
[0019]
The connecting member 38 is formed in a cylindrical shape using an electrically insulating material such as a modified FRP, and the insulating member 40 is also formed using an electrically insulating material such as a modified silicone sealite. Therefore, the rotation transmission unit 3 is provided in a state of being electrically insulated from the rotation transmission blocking unit 2 by the connecting member 38 and the insulating member 40, and is also provided to the rotation passive unit 1 by the resin outer cylinder 32. It is provided in an electrically insulated state.
[0020]
The rotation transmission unit 3 has a hexagonal shape in which the connecting portion of the operated rotating device 51 is inserted into the output side holding cylinder 34 and the operated shaft portion of the operated rotating device 51 is formed in the rotation transmitting body 37. By being fitted into the connecting hole portion 37b and further fastening the fixing member 42, it is connected to the operated rotating device 51 so as to be integrally rotatable.
[0021]
Next, the operation of the torque limiter will be described. In the torque limiter, the rotation passive unit 1 is connected to the rotation driving device 50 so as to be integrally rotatable as described above, and the rotation transmitting unit 3 is connected to the operated rotation device 51 so as to be integrally rotatable as described above. Is attached. When the rotary drive device 50 is rotationally driven, the rotation of the rotary drive device 50 is transmitted to the input shaft portion 12, and the other rotary block body 10 and the cutoff value setting member 17 of the rotary passive portion 1 are also input to the input shaft. It is rotated integrally with the part 12.
[0022]
At normal times, the rolling wheel 22 is pressed into the engagement recess 19 by the urging force of the compression coil spring 27, so that the rotation passive portion 1 and the rotation transmission blocking portion 2 are integrally rotated. It is connected. The rotation of the rotation transmission blocking unit 2 that rotates integrally with the rotation passive unit 1 is transmitted to the rotation transmission body 37 via the connecting member 38 and further transmitted to the operated rotation device 51 connected to the rotation transmission body 37. Is done. That is, the rotational force of the rotational drive device 50 is transmitted to the operated rotational device 51 through the torque limiter.
[0023]
When the rotational torque of the actuated rotating device 51 increases and reaches a predetermined value set in advance, that is, the rotational torque exceeds the holding force for engaging the rolling wheel 22 and the locking recess 19. In this case, as shown in FIG. 5, the rolling wheel 22 can no longer hold the engaged state with respect to the locking recess 19 of the rotating rotating block body 10 and is pushed out of the locking recess 19, and then the rotating block body 10. The passive block body 20 to which the rolling wheel 22 is attached is moved in the direction toward the rotation transmission portion 3 indicated by an arrow while further compressing the compression coil spring 27. Thereby, the rotation transmission from the rotation passive part 1 to the rotation transmission interruption | blocking part 2 is interrupted | blocked, and the rotation passive part 1 continues idling.
[0024]
When the passive block body 20 and the support shaft body 23 are moved, the rotation transmission body 37 of the rotation transmission unit 3 is also moved integrally with the rotation transmission blocking unit 2 via the connecting member 38, but the rotation transmission shown in FIG. The gap d1 between the flange 37a of the body 37 and the output-side holding cylinder 34 and the gap d2 between the tip of the rotation transmission body 37 and the recess on the inner surface of the output-side holding cylinder 34 are the movement of the rotation transmission body 37, respectively. Since it is set larger than the distance, the rotation transmission body 37 can move without any trouble.
[0025]
At this time, the rolling wheel 22 comes into pressure contact with the rotation transmitting end surface 10b of the rotating block body 10 of the rotating passive unit 1 that continues to rotate while rolling, and the locking recess 22 is only once per rotation of the rotating block body 10. Accordingly, the rotary passive unit 1 that continues to rotate integrally with the rotary drive device 50 can idle without receiving a large load. Further, the rotational force of the cutoff value setting member 17 of the rotary passive portion 1 that continues to rotate is absorbed by the rotation of the thrust bearing 29 in which the square spring 30 and the thrust bearing ring 31 are arranged on both sides, and the rotation transmission cutoff portion 2 Since it is hardly transmitted to the compression coil spring 27, the compression coil spring 27 is not distorted and no loud noise is generated. Also by this, the rotation passive unit 1 continues to idle smoothly without receiving an excessive rotation stopping force from the rotation transmission blocking unit 2. Therefore, this torque limiter has high durability because the idling operation of the rotary passive unit 1 after the rotation transmission is cut off is performed very smoothly without any excessive force acting on any part. Will be.
[0026]
Further, in this torque limiter, the rotational torque which is a threshold value for interrupting the rotation transmission is caused by the spring force of the compression coil spring 27, the depth of the locking recess 19 and the rotation of the locking recess 19 as shown in FIG. Although it can be set by the number of pressure contact points of the driving wheel 22 (in this embodiment, the case where three pressure contact points P1 to P3 are set is illustrated), in this embodiment, it is mainly set by the spring force of the compression coil spring 27. It is supposed to be. Therefore, as clearly shown in FIG. 4, the locking recess 19 can have a small depth, and thereby the rolling operation of the rolling wheel 22 when the rotation transmission is interrupted is performed more smoothly.
[0027]
Further, in this torque limiter, the male screw of the cutoff value setting member 17 that is screwed into the female screw portion 13a of the connecting cylinder 13 by inserting a tool into the rotation operation hole 17b and rotating the cutoff value setting member 17. If the portion 17a is screwed in a direction in which it is in contact with or separated from the compression coil spring 27, the spring force of the compression coil spring 27, that is, a cutoff value that is a rotational torque for interrupting rotation transmission can be arbitrarily variably set. it can. Moreover, as described above, the rotational force of the cutoff value setting member 17 is absorbed by the rotation of the thrust bearing 29 and hardly transmitted to the compression coil spring 27. Therefore, even when the spring force of the compression coil spring 27 is set large. No trouble occurs in the rotary passive unit 1. Therefore, in this torque limiter, the cutoff value of the rotation transmission can be changed as appropriate in accordance with the device to be attached, so that the applicable range is wide.
[0028]
Further, in this torque limiter, rotation transmission is interrupted by a simple configuration including only the locking recess 19 and the rolling wheel 22 that engage with each other and the compression coil spring 27 that presses the rolling wheel 22 into the locking recess 19. Because it has the functions of rotational torque detection and rotational force transmission and interruption for the purpose, the overall configuration becomes much more compact, and the advantage that it becomes inexpensive with the simplification of the configuration There is.
[0029]
Further, in this torque limiter, the rotation transmission unit 3 is provided in an electrically insulated state with respect to the rotation transmission blocking unit 2 by the connecting member 38 and the insulating member 40, and the rotation passive unit is formed by the resin-made outer cylindrical body 32. Since the rotation drive device 50 and the operated rotation device 51 are electrically insulated from each other, the rotation can be suitably applied to the application. For example, this torque limiter is an indirect work tool or wiring work manipulator (robot) used in the so-called “hot stick method”, which performs indirect hot wire work by remote operation to a lived high voltage line. ), The rotational force of the rotary drive unit is transmitted as it is to the operated rotary unit while the rotary drive unit and the operated rotary unit are electrically insulated from each other. In addition, it is possible to operate so that rotation transmission from the rotation driving unit to the operated rotating unit is automatically interrupted when the operated rotating unit is overloaded.
[0030]
【The invention's effect】
As described above, according to the torque limiter of the present invention, when the rotation transmission is interrupted, the rotation passive portion can rotate idly without receiving a large load from the rotation transmission interrupting portion due to the rolling of the rolling wheels. Since the idling operation of the rotary passive part after the shut-off is performed very smoothly without any excessive force acting on any part, it has high durability. Further, the cutoff value, which is the rotational torque for interrupting the rotation transmission, is set by the degree of engagement between the rolling wheel and the engagement recess and the biasing force of the elastic body. When the torque reaches a predetermined value, the rotation transmission can be accurately interrupted. Further, in this torque limiter, rotation torque detection for blocking rotation transmission is achieved with a simple configuration comprising only a locking recess and a rolling wheel that engage with each other, and an elastic body that presses the rolling wheel into the locking recess. And the function of transmitting and blocking the rotational force, the entire configuration is remarkably compact, and there is an advantage that the cost is reduced as the configuration is simplified.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a torque limiter according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a rotation transmission blocking unit in the torque limiter of the above.
FIGS. 3A and 3B are a perspective view showing a rotating block body in the torque limiter same as the above and a rear view seen from the right side of FIG.
FIG. 4 is an enlarged view of a part of the torque limiter of the above.
FIG. 5 is a longitudinal sectional view showing a state where rotation transmission in the torque limiter is cut off.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotation passive part 2 Rotation transmission interruption | blocking part 3 Rotation transmission part 10 Rotation block body 10b Rotation transmission end surface 13 Connection cylinder 13a Female thread part 17 Cutoff value setting member 17a Male thread part 17b Rotation operation hole (rotation operation part)
19 Locking recess 20 Passive block body 22 Rolling wheel 23 Support shaft body 27 Compression coil spring (elastic body)
37 Rotation Transmitter 50 Rotation Drive Device (Rotation Drive Source)
51 Actuated rotating device (actuated rotating mechanism)

Claims

A rotary passive unit coupled to the rotary drive source and rotating integrally therewith;
A rotation transmission unit connected to the driven rotation mechanism and rotating the rotation unit integrally;
The rotation passive unit and the rotation transmission unit are connected so as to be integrally rotatable, and rotation transmission from the rotation passive unit to the rotation transmission unit is automatically performed when the rotation torque of the rotation transmission unit rises to a set value. A rotation transmission blocking section that blocks
The rotation passive portion has a rotation block body provided with a locking recess on a rotation transmission end face and connected to the rotation drive source so as to rotate integrally,
The rotation transmission blocking portion is rotatably attached to a passive block body connected to the rotation passive portion via a rolling wheel fitted in the locking recess, and urges the passive block body. And an elastic body that holds the rolling wheel in the locking recess, and is connected to the passive block body so as to be integrally rotatable. A support shaft that is held so as to be movable in the direction of pressure contact in a rolling state on the rotation transmission end surface after the rolling wheel comes out of the locking recess against the urging force of the body ,
The rotation transmitting end face of the rotating block body is provided with a circular receiving hole in the axial direction, and the passive block body has a support shaft that is rotatably and slidably supported by the receiving hole in the axial direction. Have
And the said locking recessed part is formed between the said receiving hole and outer peripheral end of the rotation transmission end surface of the said rotation block body, and it provided so that it might protrude in the direction orthogonal to the said axial center direction to the said passive block body. A torque limiter , wherein the rolling wheel is rotatably attached to a spindle of a book .

The elastic body of the rotation transmission blocking part is composed of a compression coil spring inserted through the support shaft body,
A connecting cylinder in which one end is fixed to the rotating block body of the rotary passive part and an internal thread is formed on the inner peripheral surface of the other end;
A rotation operating portion and a male screw portion formed on the outer peripheral surface are rotatably mounted on a support shaft body of the rotation transmission blocking portion, and the male screw portion is screwed to the female screw portion to A cutoff value setting member to be pressed against the passive block body;
A thrust bearing interposed between the cutoff value setting member and the compression coil spring;
By moving the cutoff value setting member in the direction of contact with and separating from the compression coil spring by the rotation operation by the rotation operation unit, the spring force for pressing the rolling element in the compression coil spring against the locking recess can be variably adjusted. The torque limiter according to claim 1, which is configured as follows.

The support shaft body of the rotation transmission blocking portion and the rotation transmission body of the rotation transmission portion are connected to each other so as to be integrally rotatable by a connecting member made of an electrically insulating material with an electric insulating member interposed between the opposing surfaces. The torque limiter according to claim 1 or 2.