JP3723714B2

JP3723714B2 - Rotating electrical parts

Info

Publication number: JP3723714B2
Application number: JP2000071093A
Authority: JP
Inventors: 慎一溝渕
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2000-03-09
Filing date: 2000-03-09
Publication date: 2005-12-07
Anticipated expiration: 2020-03-09
Also published as: CN1241221C; KR100403430B1; CN1313620A; JP2001257106A; KR20010089218A

Description

【０００１】
【発明の属する技術分野】
本発明は回転型電気部品に係わり、特にビデオカメラ等に使用して好適な回転型電気部品に関する。
【０００２】
【従来の技術】
従来回転型電気部品は、図８に示すように、回転自在の操作部材４１が配設され、この操作部材４１は操作軸４２と回転体４３とがネジ４４で締め付けられて一体化されて構成されている。また、操作部材４１は、支持部材４５に回転自在に支持されている。前記支持部材４５は、軸孔４６ａを有する軸受部４６と、内部に回転体４３を収納可能な空洞部４７ａを有するケース４７とが形成されている。
このケース部４７の空洞部４７ａ内には、回転体４３が収納され、この回転体４３の対向面４３ａと対向する側に対向面４７ｂが形成され、この対向面４７ｂにリング状に突出形成されたリング当接部４７ｃが形成されている。
【０００３】
前記支持部材４５の対向面４７ｂには、所定の線径と外径寸法からなり、シリコンゴム等の弾性のあるＯリング４８が配設されている。このＯリング４８は、内周部がリング当接部４７ｃに当接して、径方向の動きが規制されるようになっている。
このような従来の回転型電気部品の組立は、まず、リング当接部４７ｃにＯリング４８を取り付けた支持部材４５の軸孔４６ａに、操作軸４２を挿入する。次に、軸孔４６ａから挿通されて空洞部４７ａ内に位置する操作軸４２の先端に回転体４３を挿入する。
そして、操作軸４２の先端部に形成したネジ部にネジ４４を締め付けると、Ｏリング４８が回転体４３の対向面４３ａと支持部材４５の対向面４７ｂに弾接狭持されて、操作軸４２に所定の回転トルクが創出される。
その後、操作軸４２とネジ４４とに接着剤（図示せず）を塗布することにより、回転体４３が緩み止めされて、操作軸４２を回転中にネジ４４が緩むことがない。
【０００４】
このように組み立てられた従来の回転型電気部品のＯリング４８は、支持部材４５側が、対向面４７ｂとリング当接部４７ｃとに弾接する。また、操作部材４１側は、回転体４３の対向面４３ａの１面だけに弾接する。
そのために、操作軸４２によって回転体４３を回転させると、Ｏリング４８は接触面積の大きな支持部材４５側で回り止めされ、接触面積の小さな回転体４３の対向面４３ａとの間で滑りが発生し、操作軸３２に回転トルクが創出されるようになっている。
【０００５】
このような従来の回転型電気部品が、例えば可変抵抗器の場合だと、ケース４７の対向面４７ｃに摺動子片（図示せず）が取り付けられ、回転体４３の対向面４３ａに、前記摺動子片が摺動可能な抵抗体が形成され、操作軸４２の回転により、摺動子片が抵抗体上を摺動して、抵抗値が可変するようになっている。
このような従来の回転型電気部品は、Ｏリング４８に弾性があるので、部品寸法のバラツキで、回転体４３と支持部材４５のそれぞれの対向面４３ａ、４７ｂ間の隙間寸法にバラツキが発生したとしても、操作軸４２の回転トルクのバラツキを小さくすることができる。
【０００６】
【発明が解決しようとする課題】
しかし、従来の回転型電気部品は、操作軸４２の繰り返しの回転により、軸孔４６ａに塗布していた潤滑剤としてのグリス等が、リング当接部４７ｃ、及びこのリング当接部４７ｃからＯリング４８が弾接する対向面４７ｂに流れ出すことがある。
すると、支持部材４５側に回り止めして支持していたＯリング４８は、支持部材４５の対向面４７ｂとの間での摩擦抵抗が小さくなり、回転体４３を回転させると、回転体４３の回転に追従してＯリング４８が回転し、この時の操作軸４２の回転トルクが、支持部材４５側にＯリング４５が回り止めされていたときに対して変化する問題があった。
【０００７】
また、回転体４３の回転にＯリング３８が追従して回転したりしなかったりすることがある。このような現象が発生すると、操作軸４２を所定の回転角度だけ回転させて操作中に、回転トルクが重くなったり軽くなったりする回転ムラが発生して、操作フィーリングが悪くなって回転操作がし難くなる問題があった。
また、操作軸４２の繰り返しの回転により、回転体４３の対向面４３ａとＯリング４８との間で滑り摩擦によって、Ｏリング４８が外周方向に押し広げられて、ねじれ、又はしわ等が発生して、回転トルクが不安定になることもあった。
本発明は、前述したような問題点に鑑みてなされたもので、回転トルクを一定に保つことができると共に、回転ムラがなくて操作フィーリングの良い回転型電子部品を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題を解決するための第１の解決手段として本発明の回転型電気部品は、回転可能な操作部材と、この操作部材を回転可能に支持する支持部材とを備え、この支持部材と前記操作部材とは、前記操作部材に挿通した操作軸の軸方向と直交する方向に互いに対向する対向面を有し、この互いの対向面が形成する隙間部分に円環状のＯリングを配設し、このＯリングは、前記互いの対向面で弾接挟持され、前記操作部材及び前記支持部材は、互いに摩擦抵抗の異なる材料から形成されると共に、前記操作部材、又は前記支持部材の、前記Ｏリングが弾接する部分のいずれか一方の前記対向面に、前記Ｏリングを回り止めするための凸部を形成し、該凸部を形成した方の前記操作部材、又は前記支持部材に摩擦抵抗の大きな材料を用いた構成とした。
【０００９】
また、上記課題を解決するための第２の解決手段として、前記操作部材、又は前記支持部材の前記凸部が形成された側の前記対向面に、前記Ｏリングの外周部が当接可能なリング当接部を突出形成した構成とした。
【００１０】
また、上記課題を解決するための第３の解決手段として、前記操作部材、又は前記支持部材のいずれか一方の前記対向面に前記Ｏリングを収納可能な収納溝を設け、この収納溝の底面に前記凸部を形成した構成とした。
【００１１】
また、上記課題を解決するための第４の解決手段として、前記凸部は、前記Ｏリングを横切る方向に細長で線状に突出形成した構成とした。
【００１２】
また、上記課題を解決するための第５の解決手段として、前記凸部は、先端形状を三角状、又は四角状に形成した構成とした。
【００１３】
また、上記課題を解決するための第６の解決手段として前記支持部材をダイカスト及び前記操作部材を合成樹脂、又は前記支持部材を合成樹脂及び前記操作部材を金属板で形成した構成とした。
【００１４】
【発明の実施の形態】
次に、本発明の回転型電気部品を図１から図７に基づいて説明すると、図１は本発明の回転型電気部品の要部断面図であり、図２は本発明の回転型電気部品の分解斜視図であり、図３は本発明の第１の実施の形態に係わる支持部材の平面図であり、図４は本発明の第１の実施の形態に係わる支持部材の断面図であり、図５は本発明に係わる凸部の形状を示す要部断面図であり、図６は本発明の第２の実施の形態に係わる支持部材の断面図であり、図７は本発明に係わる凸部の変形例を示す図である。
【００１５】
本発明の回転型電気部品を、エンコーダを例に、図１、図２に基づいて説明すると、図２の右側には取付板１が配設され、この取付板１は、金属板を折り曲げ加工して形成され、互いに対向する側部には爪部１ａが形成され、この爪部１ａは、後述する支持部材２とスペーサ１３との間に絶縁ケース１２を狭持した状態でスペーサ１３にカシメ付け可能になっている。
また、支持部材２は、亜鉛ダイカスト等からなり、四角板状の基部３と、円筒状の軸受け部４とが一体形成されている。前記支持部材２は、図３、４に示すように、基部３の一方の面にの中央部には、円形の収納穴３ａが形成され、この収納穴３ａの深さは、図４に示すように、軸受部４の図示上下方向の中央部付近まで形成されている。
また軸受部４には、軸孔４ａが貫通形成され、この軸孔４ａに後述する操作軸５が挿通可能になっている。そして、操作部材２は、基部３の上面に位置する取付板１により、後述する絶縁ケース１２にカシメ付けられて、後述する操作部材８が回転可能に支持されている。
【００１６】
前記基部３の一方の面の収納穴３ａ周囲には、平坦状の対向面３ｂが形成され、この対向面３ｂの外周部に円形のリング当接部３ｃが突出形成されている。
また、対向面３ｂ上には、互いに対向する位置に、２個の凸部３ｄが後述するＯリング６を横切る方向に、操作軸５を挟んで細長で線状に突出形成されている。この凸部３ｄは、図５Ａに示すような、先端形状が三角状に形成されている。
また、凸部３ｄの先端形状は、三角状だけでなく、図５Ｂに示すように、四角状に形成したものでも良い。
また、凸部３ｄは、２個に限定されるものではなく、２個以上の複数個対向面３ｂ上に放射状に形成しても良い。
【００１７】
また、軸孔４ａに挿通される操作軸５は、図２に示すように、先端部に係合溝５ｂが中心軸Ｊ方向に形成され、この係合溝５ｂの底部近辺の外周部にストッパー溝５ｂが形成されている。
そして、軸孔４ａに挿通した操作軸５は、ストッパー溝５ｂに後述する軸止めバネ７を嵌合させることにより、支持部材２に抜け止めされると共に、図１において、上下動自在に支持部材２に支持可能となっている。
前記基部３の対向面３ｂには、所定寸法の線径と外径寸法からなる円環状のＯリング６が配設されている。このＯリング６は、例えばシリコンゴム等の弾性があるもので形成され、グリス等の潤滑剤に対して膨潤等の問題を起こさないようになっている。
このようなＯリング６を、対向面３ｂ上に位置させると、外周部がリング当接部３ｃにガイドされて収納される。
【００１８】
また、図１に示す操作軸５のストッパー溝５ｂには、線バネを円弧状に曲げ加工して形成した軸止めバネ７が嵌合可能になっている。
また、支持部材２の収納穴３ａ内には、合成樹脂からなる円盤状の操作部材８の一部が収納されるようになっている。この操作部材８は、一方の面に、図２に示すような導体パターン８ａと、この導体パターン８ａの円周方向を部分的に等間隔で分割する複数の絶縁体８ｂとが露出して形成されている。
また、前記一方の面の中央部には、後述する駆動体９を収納可能な円形の収納部８ｃと、この収納部８ｃには、角溝状の駆動孔８ｄが貫通形成されている。また、他方の面には平坦状の対向面８ｅが形成され、この対向面８ｅに支持部材２のリング当接部３ｃに収納したＯリング６が弾接可能になっている。
【００１９】
前記操作部材８の収納部８ｃには、駆動体９が収納可能となっており、この駆動体９には、駆動孔８ｄに係合して駆動体９を操作部材８に回り止めするための回り止め部９ａと、操作軸５の係合溝５ａが嵌合可能な係合突起９ｂとが形成されている。
そして、回り止め部９ａを駆動孔８ｃに係合させ、係合突起９ｂを操作軸５の係合溝５ａに嵌合させた状態の駆動体９は、図１に示す後述するゴムラバー１０により、常に上方に弾性付勢されて、操作軸５を上方に押し上るようになっている。
そして、操作軸５を回転操作することにより、駆動体９を介して操作部材８が回転可能になっている。
【００２０】
また、図１に示す操作部材８の収納部８ｃ内には、弾性変形可能なドーム状のゴムラバー１０が配設され、このゴムラバー１０によって、図１の駆動体９が図示上方に常に弾性付勢されている。前記ゴムラバー１０のドーム状の空洞内部の頂部には後述する可動接点１１の接点部１１ａを押圧可能な接点押圧部１０ａが図示下方に突出形成されている。
そして、操作軸５を上下動させると、ゴムラバー１０が弾性変形して接点押圧部１０ａが上下動するようになっている。
また、図１に示すゴムラバー１０の下部には、バネ性のある金属板からなる可動接点１１が配設され、この可動接点１１は、図２に示すような接点部１１ａが形成され、この接点部１１ａの外側には、接点部１１ａを囲むようにリング状の導電部１１ｂが形成されている。
【００２１】
前記可動接点１１は、接点部１１ａと導電部１１ｂを接続する接続部１１ｃを有し、操作軸５を下方に押圧すると、ゴムラバー１０が弾性変形し、接点押圧部１０ａが接点部１１ａを下方に押し下げるようになっている。
また、可動接点１１は、リング状の導電部１１ｂがゴムラバー１０の外周部に押圧されて、絶縁ケース１２に位置決めされて取り付けられている。
前記絶縁ケース１２には、図２に示すように、摺動子片１２ａをインサート成形するための一対の開口部１２ｂが貫通形成され、この開口部１２ｂ内に摺動子片１２ａが露出して形成されている。
前記摺動子片１２ａには端子１２ｃが接続されて、摺動子片１２ａ、及び端子１２ｃがインサート成形等により絶縁ケース１２に一体化されている。
【００２２】
また、図１に示す絶縁ケース１２の中央部で、可動接点１１の接点部１１ａが位置する下部には、第１固定接点１２ｂが、また、可動接点１１の導電部１１ｂの下部には第２固定接点１２ｅが、それぞれインサート成形等により絶縁ケース１２に一体化されている。前記第１、第２固定接点１２ｄ、１２ｅは端子１２ｆに接続されている。
また、絶縁ケース１２の下面には、開口部１２ｂを蓋閉するためのスペーサ１３が配設されている。
【００２３】
このような構成の本発明の回転型電気部品の組立を図１に基づいて説明すると、図示しない組立治具にスペーサ１３を載置する。このスペーサ１３の上から絶縁ケース１２を重ね、この絶縁ケース１２の第２固定接点１２ｅ上に、可動接点１１の導電部１１ｂを位置決めして載置する。
次に、可動接点１１の上からゴムラバー１０を載置し、このゴムラバー１０を載置した状態の絶縁ケース１２の上に、支持部材２、操作軸５、駆動体９等を一体化して半製品とし操作部材８を載置する。
すると、ゴムラバー１０が収納部８ｃに収納され、このゴムラバー１０の弾性力で駆動体９が上方に弾性付勢されると共に、支持部材２の位置決め突起３ｅが、絶縁ケース１２の位置決め孔（図示せず）に挿入されて、支持部材２が絶縁ケース１２に位置決めされる。
【００２４】
前記支持部材２、操作軸５、駆動体９等を一体化して半製品とした操作部材８には、Ｏリング６がリング当接部３ｃ内に収納されており、このＯリング６は、操作部材８の対向面８ｅに当接するようになっている。
そして、支持部材２の上から取付板１をかぶせ、取付板１のそれぞれの爪部１ａをスペーサ１３にカシメ付けて、本発明の回転型電気部品の組み立てが終了する。
【００２５】
このような回転型電気部品は、取付板１をスペーサ１３にカシメ付けることにより、Ｏリング６が支持部材２の対向面３ｄと操作部材８の対向面８ｅとに圧接されて弾接狭持される。
そして、操作軸５により駆動体９を介して操作部材８を回転させると、操作部材８の対向面８ｅとＯリング６との間で摺動摩擦が発生して、操作軸８に所定の回転トルクが創出される。
また、支持部材２の対向面３ｂ内に収納されているＯリング６は、対向面３ｂに形成した凸部３ｄが喰い込んでいるので、操作部材８を繰り返し回転させても、Ｏリング６が操作部材８と共に回転することがなく、操作軸５の回転トルクを常に一定にできる。
【００２６】
また、軸孔４ａに塗布している潤滑剤（図示せず）が、支持部材２の対向面３ｂに流れ出したとしても、Ｏリング６は、凸部３ｄによって支持部材２に回り止めされているので、操作部材８の回転に追従して回転することがない。
そのために、操作軸５を繰り返し回転させても、常に一定の回転トルクを得ることができる。
【００２７】
また、本発明の第１の実施の形態の変形例として、図示は省略するが、操作部材８の対向面８ｅ側にリング当接部及び凸部を形成したものでも良い。この場合の支持部材２側は、リング当接部３ｃ、及び凸部３ｄがなく、対向面３ｂが平坦状に形成されている。
そのために、第１の実施の形態の変形例のＯリング６は、操作部材８の対向面８ｅに形成した凸部（図示せず）によって、操作部材８に回り止めされて支持されるので、操作部材８を回転させると、Ｏリング６は操作部材８と共に回転して、支持部材２の対向面３ｂとの間での摺動摩擦により、操作軸５の回転トルクを常に一定にできる。
即ち、操作部材８、又は支持部材２の、Ｏリング６が弾接する部分の、いずれか一方の対向面８ｅ、３ｂに、Ｏリング６を回り止めするための凸部を形成しても良い。
【００２８】
また、本発明の第２の実施の形態として、図６に示すように、支持部材２の対向面３ｂに、Ｏリング６を収納可能な収納溝３ｆを設け、この収納溝３ｆの底面に、本発明の実施の形態で説明した凸部３ｄと同形状の凸部３ｇを、操作軸５の軸方向と直交する方向にスジ状に形成したものでも良い。
このような収納溝３ｆにＯリング６を収納すると、Ｏリング６の外周、内周の両方が収納溝３ｆの側壁に当接するので、支持部材２に対するＯリング６の摩擦抵抗を更に増大させることができ、支持部材に対するＯリング６の回り止めを更に確実にすることができる。
【００２９】
また、本発明の第２の実施の形態の変形例として、図示は省略するが、操作部材８の対向面８ｅに収納溝３ｆと同形状の収納溝を形成し、支持部材２側の対向面は平坦状に形成しても良い。
即ち、操作部材８、又は支持部材２のいずれか一方の対向面３ｂ、８ｅに、Ｏリング６を収納可能な収納溝を設け、この収納溝の底面に凸部を形成しても良い。
【００３０】
また、支持部材２及び操作部材８のそれぞれの材質は、支持部材２をダイカストで、操作部材８をダイカストより摩擦抵抗の小さい合成樹脂で形成することにより、支持部材２の方が、Ｏリング６との摩擦抵抗が大きくなり、Ｏリング６を支持部材２に対して更に確実に回り止めすることができる。
また、支持部材２及び操作部材８のそれぞれの材質は、支持部材２を合成樹脂で形成し、操作部材８を合成樹脂より摩擦抵抗の小さな金属板で形成しても良い。
【００３１】
また、本発明の第１、第２の実施の形態のそれぞれの凸部は、操作軸５の軸方向と直交する方向にスジ状に複数形成したもので説明したが、図７Ａに示すように、先端形状が三角状に形成された、例えば三角錐からなる凸部３ｈでもよい。この凸部３ｈは、三角錐に限定されず、円錐、あるいは四角錐等でも良い。
また、図７Ｂに示すように、先端形状を四角状に形成した凸部３ｊでも良い。
【００３２】
【発明の効果】
本発明の回転型電気部品は、操作部材及び支持部材は、互いに摩擦抵抗の異なる材料から形成されると共に、操作部材、又は支持部材の、Ｏリングが弾接する部分のいずれか一方の前記対向面に、Ｏリングを回り止めするための凸部を形成し、該凸部を形成した方の操作部材、又は支持部材に摩擦抵抗の大きな材料を用いたので、操作部材を回転させると、Ｏリングは凸部によって、操作部材、又は支持部材のいずれか一方に回り止めして取り付けることができる。
そのために、操作軸はバラツキのない、一定の回転トルクを創出することができ、高品質の回転型電気部品を提供できる。
また、前記操作部材、及び前記支持部材の前記対向面は、前記操作部材に挿通した操作軸の軸方向と直交する方向に互いに対向して形成され、前記操作部材、又は前記支持部材の前記凸部が形成された側の前記対向面に、前記Ｏリングの外周部が当接可能なリング当接部を突出形成したので、操作部材を繰り返し回転させても、Ｏリングの外周部がリング当接部にガイドされているので、Ｏリングが外周方向に押し広げられることがなく、回転トルクを更に安定させることができる。
【００３３】
また、前記操作部材、又は前記支持部材のいずれか一方の前記対向面に前記Ｏリングを収納可能な収納溝を設け、この収納溝の底面に前記凸部を形成したので、収納溝に収納したＯリングは、外周部だけでなく内周部も収納溝でガイドされて、動きを確実に規制することができ、操作軸の回転トルクがバラツキない高品質の回転型電気部品を提供できる。
【００３４】
また、前記凸部は、前記対操作軸の軸方向と直交する方向にスジ状に複数突出形成したので、Ｏリングの回転方向に動きを規制することができ、操作軸の回転トルクを安定させることができる。
【００３５】
また、前記凸部は、先端形状を三角状、又は四角状に形成したので、Ｏリングの回り止めする対向面に潤滑剤が流れれ出たとしても、Ｏリングの回り止めを確実に行うことができる。
【００３６】
また、前記支持部材をダイカスト及び前記操作部材を合成樹脂、又は前記支持部材を合成樹脂及び前記操作部材を金属板で形成したので、Ｏリングを回り止めする方の部材に摩擦抵抗の大きな材料を用いることにより、Ｏリングの回り止めを更に確実に行うことができる。
【図面の簡単な説明】
【図１】本発明の回転型電気部品の要部断面図である。
【図２】本発明の回転型電気部品の分解斜視図である。
【図３】本発明の第１の実施の形態に係わる支持部材の平面図である。
【図４】本発明の第１の実施の形態に係わる支持部材の断面図である。
【図５】本発明に係わる凸部の形状を示す要部断面図である。
【図６】本発明の第２の実施の形態に係わる支持部材の断面図である。
【図７】本発明に係わる凸部の変形例を示す図である。
【図８】従来の回転型電気部品の要部断面図である。
【符号の説明】
１取付板
１ａ爪部
２支持部材
３基部
３ｂ対向面
３ｃリング当接部
３ｄ凸部
４軸受部
５操作軸
６Ｏリング
７軸止めバネ
８操作部材
８ａ導電パターン
８ｂ絶縁体
８ｅ対向面
９駆動体
１０ゴムラバー
１１可動接点
１２絶縁ケース
１３スペーサ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary electrical component, and more particularly to a rotary electrical component suitable for use in a video camera or the like.
[0002]
[Prior art]
As shown in FIG. 8, the conventional rotary electric component is provided with a rotatable operation member 41, and this operation member 41 is constituted by an operation shaft 42 and a rotating body 43 being tightened and integrated with a screw 44. Has been. The operation member 41 is rotatably supported by the support member 45. The support member 45 is formed with a bearing portion 46 having a shaft hole 46a and a case 47 having a hollow portion 47a in which the rotating body 43 can be accommodated.
The rotating body 43 is accommodated in the hollow portion 47a of the case portion 47, a facing surface 47b is formed on the side facing the facing surface 43a of the rotating body 43, and is formed to project from the facing surface 47b in a ring shape. A ring contact portion 47c is formed.
[0003]
On the opposing surface 47b of the support member 45, an elastic O-ring 48 having a predetermined wire diameter and an outer diameter and made of silicon rubber or the like is disposed. The O-ring 48 is configured such that its inner peripheral portion abuts on the ring abutting portion 47c and its radial movement is restricted.
In assembling such a conventional rotary electric component, first, the operation shaft 42 is inserted into the shaft hole 46a of the support member 45 in which the O-ring 48 is attached to the ring contact portion 47c. Next, the rotating body 43 is inserted into the distal end of the operation shaft 42 that is inserted through the shaft hole 46a and positioned in the cavity 47a.
When the screw 44 is tightened to the screw portion formed at the distal end portion of the operation shaft 42, the O-ring 48 is elastically held between the facing surface 43 a of the rotating body 43 and the facing surface 47 b of the support member 45, and the operation shaft 42 is held. A predetermined rotational torque is created.
Thereafter, by applying an adhesive (not shown) to the operation shaft 42 and the screw 44, the rotating body 43 is prevented from loosening, and the screw 44 is not loosened while the operation shaft 42 is rotating.
[0004]
The O-ring 48 of the conventional rotating electrical component assembled in this way elastically contacts the opposing surface 47b and the ring contact portion 47c on the support member 45 side. Further, the operation member 41 side is in elastic contact with only one surface of the facing surface 43 a of the rotating body 43.
Therefore, when the rotating body 43 is rotated by the operating shaft 42, the O-ring 48 is prevented from rotating on the support member 45 side having a large contact area, and slippage occurs between the opposing surface 43a of the rotating body 43 having a small contact area. In addition, a rotational torque is created on the operation shaft 32.
[0005]
When such a conventional rotating electrical component is a variable resistor, for example, a slider piece (not shown) is attached to the facing surface 47c of the case 47, and the facing surface 43a of the rotating body 43 has the above-mentioned surface. A resistor capable of sliding the slider piece is formed, and the slider piece slides on the resistor by the rotation of the operation shaft 42 so that the resistance value is variable.
In such a conventional rotary electric component, since the O-ring 48 has elasticity, the size of the gap between the opposing surfaces 43a and 47b of the rotating body 43 and the support member 45 varies due to variations in component dimensions. However, the variation in the rotational torque of the operation shaft 42 can be reduced.
[0006]
[Problems to be solved by the invention]
However, in the conventional rotary electric component, due to repeated rotation of the operation shaft 42, grease or the like applied as a lubricant to the shaft hole 46a is removed from the ring contact portion 47c and the ring contact portion 47c. The ring 48 may flow out to the opposing surface 47b where it comes into elastic contact.
Then, the O-ring 48 that has been supported by being supported on the support member 45 side has a small frictional resistance with the opposing surface 47b of the support member 45, and when the rotator 43 is rotated, The O-ring 48 rotates following the rotation, and there is a problem that the rotational torque of the operation shaft 42 at this time varies with respect to the case where the O-ring 45 is prevented from rotating on the support member 45 side.
[0007]
Further, the O-ring 38 may or may not rotate following the rotation of the rotating body 43. When such a phenomenon occurs, during the operation by rotating the operation shaft 42 by a predetermined rotation angle, a rotation unevenness in which the rotation torque becomes heavy or light occurs, and the operation feeling deteriorates and the rotation operation is performed. There was a problem that made it difficult to understand.
Further, due to repeated rotation of the operation shaft 42, the O-ring 48 is expanded in the outer circumferential direction by sliding friction between the facing surface 43 a of the rotating body 43 and the O-ring 48, and twisting or wrinkling occurs. As a result, the rotational torque may become unstable.
The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a rotary electronic component that can maintain a constant rotational torque and that has no rotation unevenness and good operation feeling. To do.
[0008]
[Means for Solving the Problems]
Rotary electrical component of the present invention as a first solving means for solving the above problems, comprises a rotatable operating member, and a support member for rotatably supporting the operating member, wherein the support member The operating member has opposing surfaces that face each other in a direction orthogonal to the axial direction of the operating shaft that is inserted through the operating member, and an annular O-ring is disposed in a gap formed by the opposing surfaces. The O-ring is elastically held between the opposing surfaces, and the operation member and the support member are formed of materials having different frictional resistances , and the O-member of the operation member or the support member A convex portion for preventing rotation of the O-ring is formed on any one of the opposing surfaces of the portion where the ring is elastically contacted, and the operation member or the support member on which the convex portion is formed has a frictional resistance. configuration and using a large material It was.
[0009]
As a second solving means for solving the above problems, before Symbol operating member or the to the facing surface of the side where the convex portion is formed in the support member, the outer peripheral portion of the O-ring can abut In this configuration, a ring contact portion is formed to protrude.
[0010]
Further, as a third means for solving the above problem, a storage groove capable of storing the O-ring is provided on the facing surface of either the operation member or the support member, and the bottom surface of the storage groove The projection is formed on the surface.
[0011]
Further, as a fourth means for solving the above-mentioned problem, the convex portion is formed to be elongated and linearly project in a direction crossing the O-ring.
[0012]
Further, as a fifth solving means for solving the above-mentioned problem, the convex portion has a configuration in which the tip shape is formed in a triangular shape or a square shape.
[0013]
Further, as a sixth solving means for solving the above problems, the support member is formed by die casting and the operation member is made of synthetic resin, or the support member is made of synthetic resin and the operation member is made of a metal plate.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, the rotary electric component of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a cross-sectional view of the main part of the rotary electric component of the present invention, and FIG. 2 is the rotary electric component of the present invention. FIG. 3 is a plan view of the support member according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view of the support member according to the first embodiment of the present invention. 5 is a cross-sectional view of the main part showing the shape of the convex portion according to the present invention, FIG. 6 is a cross-sectional view of the support member according to the second embodiment of the present invention, and FIG. 7 is related to the present invention. It is a figure which shows the modification of a convex part.
[0015]
The rotary electric component of the present invention will be described with reference to FIGS. 1 and 2, taking an encoder as an example. A mounting plate 1 is disposed on the right side of FIG. 2, and the mounting plate 1 is formed by bending a metal plate. The claw portions 1a are formed on the side portions facing each other, and the claw portions 1a are caulked to the spacers 13 with the insulating case 12 sandwiched between the support member 2 and the spacers 13 described later. It is possible to attach.
The support member 2 is made of zinc die casting or the like, and a square plate-like base portion 3 and a cylindrical bearing portion 4 are integrally formed. As shown in FIGS. 3 and 4, the support member 2 is formed with a circular storage hole 3a at the center of one surface of the base 3, and the depth of the storage hole 3a is shown in FIG. Thus, the bearing portion 4 is formed up to the vicinity of the central portion in the vertical direction of the drawing.
Further, a shaft hole 4a is formed through the bearing portion 4, and an operation shaft 5 described later can be inserted into the shaft hole 4a. The operation member 2 is caulked to an insulating case 12 described later by the mounting plate 1 positioned on the upper surface of the base portion 3, and the operation member 8 described later is rotatably supported.
[0016]
A flat facing surface 3b is formed around the accommodation hole 3a on one surface of the base portion 3, and a circular ring abutting portion 3c is formed to protrude from the outer periphery of the facing surface 3b.
Further, on the facing surface 3b, two convex portions 3d are formed so as to project in a slender and linear shape across the operation shaft 5 in a direction crossing an O-ring 6 described later at positions facing each other. As shown in FIG. 5A, the protrusion 3d has a triangular tip shape.
Further, the tip shape of the convex portion 3d is not limited to a triangular shape, but may be a rectangular shape as shown in FIG. 5B.
Moreover, the convex part 3d is not limited to two pieces, You may form radially on the 2 or more multiple opposing surface 3b.
[0017]
Further, as shown in FIG. 2, the operation shaft 5 inserted through the shaft hole 4a has an engagement groove 5b formed in the tip end portion in the direction of the central axis J, and a stopper on the outer peripheral portion near the bottom of the engagement groove 5b. A groove 5b is formed.
The operating shaft 5 inserted through the shaft hole 4a is prevented from being detached by the support member 2 by fitting a shaft stop spring 7 (described later) into the stopper groove 5b. 2 can be supported.
An annular O-ring 6 having a predetermined diameter and an outer diameter is disposed on the facing surface 3 b of the base 3. The O-ring 6 is formed of an elastic material such as silicon rubber, and does not cause problems such as swelling with respect to a lubricant such as grease.
When such an O-ring 6 is positioned on the facing surface 3b, the outer peripheral portion is guided and stored in the ring contact portion 3c.
[0018]
Further, a shaft stop spring 7 formed by bending a wire spring into an arc shape can be fitted into the stopper groove 5b of the operation shaft 5 shown in FIG.
A part of the disk-shaped operation member 8 made of synthetic resin is accommodated in the accommodation hole 3 a of the support member 2. The operation member 8 is formed on one surface by exposing a conductor pattern 8a as shown in FIG. 2 and a plurality of insulators 8b that divide the circumferential direction of the conductor pattern 8a partially at equal intervals. Has been.
In addition, a circular storage portion 8c that can store a driving body 9 to be described later is formed in the central portion of the one surface, and a rectangular groove-shaped drive hole 8d is formed through the storage portion 8c. Further, a flat facing surface 8e is formed on the other surface, and the O-ring 6 accommodated in the ring contact portion 3c of the support member 2 can be elastically contacted with the facing surface 8e.
[0019]
A drive body 9 can be stored in the storage portion 8 c of the operation member 8. The drive body 9 is engaged with the drive hole 8 d to prevent the drive body 9 from rotating around the operation member 8. An anti-rotation portion 9a and an engagement protrusion 9b into which the engagement groove 5a of the operation shaft 5 can be fitted are formed.
Then, the driving body 9 in a state in which the rotation preventing portion 9a is engaged with the driving hole 8c and the engaging protrusion 9b is engaged with the engaging groove 5a of the operation shaft 5 is obtained by a rubber rubber 10 shown in FIG. It is always elastically biased upward to push up the operating shaft 5 upward.
The operation member 8 can be rotated via the drive body 9 by rotating the operation shaft 5.
[0020]
Further, an elastically deformable dome-shaped rubber rubber 10 is disposed in the accommodating portion 8c of the operation member 8 shown in FIG. 1, and the rubber rubber 10 always elastically biases the driving body 9 in FIG. Has been. A contact pressing portion 10a capable of pressing a contact portion 11a of a movable contact 11, which will be described later, is formed on the top of the rubber rubber 10 inside the dome-like cavity so as to protrude downward in the figure.
When the operation shaft 5 is moved up and down, the rubber rubber 10 is elastically deformed and the contact pressing portion 10a is moved up and down.
Further, a movable contact 11 made of a metal plate having a spring property is disposed under the rubber rubber 10 shown in FIG. 1, and the movable contact 11 is formed with a contact portion 11a as shown in FIG. A ring-shaped conductive portion 11b is formed outside the portion 11a so as to surround the contact portion 11a.
[0021]
The movable contact 11 has a connection portion 11c that connects the contact portion 11a and the conductive portion 11b. When the operating shaft 5 is pressed downward, the rubber rubber 10 is elastically deformed, and the contact pressing portion 10a moves the contact portion 11a downward. It is designed to push down.
In addition, the movable contact 11 is attached to the insulating case 12 by positioning the ring-shaped conductive portion 11 b against the outer peripheral portion of the rubber rubber 10.
As shown in FIG. 2, the insulating case 12 is formed with a pair of openings 12b for insert-molding the slider piece 12a, and the slider piece 12a is exposed in the opening 12b. Is formed.
A terminal 12c is connected to the slider piece 12a, and the slider piece 12a and the terminal 12c are integrated with the insulating case 12 by insert molding or the like.
[0022]
Further, in the central portion of the insulating case 12 shown in FIG. 1, a first fixed contact 12 b is provided at the lower portion where the contact portion 11 a of the movable contact 11 is located, and a second is provided below the conductive portion 11 b of the movable contact 11. The fixed contacts 12e are each integrated with the insulating case 12 by insert molding or the like. The first and second fixed contacts 12d and 12e are connected to a terminal 12f.
A spacer 13 for closing the opening 12b is disposed on the lower surface of the insulating case 12.
[0023]
The assembly of the rotating electrical component of the present invention having such a configuration will be described with reference to FIG. 1. The spacer 13 is placed on an assembly jig (not shown). The insulating case 12 is overlaid on the spacer 13, and the conductive portion 11 b of the movable contact 11 is positioned and placed on the second fixed contact 12 e of the insulating case 12.
Next, the rubber rubber 10 is placed on the movable contact 11, and the support member 2, the operation shaft 5, the driving body 9 and the like are integrated on the insulating case 12 in a state where the rubber rubber 10 is placed. Then, the operation member 8 is placed.
Then, the rubber rubber 10 is stored in the storage portion 8c, and the driving body 9 is elastically biased upward by the elastic force of the rubber rubber 10, and the positioning protrusion 3e of the support member 2 is positioned in the positioning hole (not shown) of the insulating case 12. The support member 2 is positioned on the insulating case 12.
[0024]
An O-ring 6 is accommodated in a ring abutting portion 3c in an operating member 8 which is a semi-finished product obtained by integrating the support member 2, the operating shaft 5, the driving body 9 and the like. The member 8 comes into contact with the facing surface 8e.
Then, the mounting plate 1 is placed over the support member 2, and each claw portion 1 a of the mounting plate 1 is caulked to the spacer 13, and the assembly of the rotating electrical component of the present invention is completed.
[0025]
In such a rotating electrical component, the mounting plate 1 is caulked to the spacer 13 so that the O-ring 6 is pressed against the opposing surface 3d of the supporting member 2 and the opposing surface 8e of the operating member 8 and is elastically held between them. The
Then, when the operating member 8 is rotated by the operating shaft 5 via the drive body 9, sliding friction is generated between the facing surface 8e of the operating member 8 and the O-ring 6, and a predetermined rotational torque is applied to the operating shaft 8. Is created.
Further, since the O-ring 6 housed in the facing surface 3b of the support member 2 is bitten by the convex portion 3d formed on the facing surface 3b, the O-ring 6 does not move even if the operation member 8 is repeatedly rotated. Without rotating with the operating member 8, the rotational torque of the operating shaft 5 can always be constant.
[0026]
Even if the lubricant (not shown) applied to the shaft hole 4a flows out to the facing surface 3b of the support member 2, the O-ring 6 is prevented from rotating around the support member 2 by the convex portion 3d. Therefore, it does not rotate following the rotation of the operation member 8.
Therefore, a constant rotational torque can always be obtained even if the operation shaft 5 is rotated repeatedly.
[0027]
Further, as a modification of the first embodiment of the present invention, although not shown, a ring contact portion and a convex portion may be formed on the facing surface 8e side of the operation member 8. In this case, the support member 2 side does not have the ring contact portion 3c and the convex portion 3d, and the facing surface 3b is formed flat.
For this purpose, the O-ring 6 of the modification of the first embodiment is supported by being prevented from rotating by the operation member 8 by a convex portion (not shown) formed on the facing surface 8e of the operation member 8. When the operation member 8 is rotated, the O-ring 6 rotates together with the operation member 8, and the rotational torque of the operation shaft 5 can always be made constant by sliding friction with the opposing surface 3 b of the support member 2.
That is, a convex portion for preventing the O-ring 6 from rotating may be formed on any one of the facing surfaces 8e and 3b of the operation member 8 or the support member 2 where the O-ring 6 is elastically contacted.
[0028]
Further, as a second embodiment of the present invention, as shown in FIG. 6, a storage groove 3f capable of storing the O-ring 6 is provided on the opposing surface 3b of the support member 2, and a bottom surface of the storage groove 3f is provided. The convex portion 3g having the same shape as the convex portion 3d described in the embodiment of the present invention may be formed in a stripe shape in a direction orthogonal to the axial direction of the operation shaft 5.
When the O-ring 6 is stored in such a storage groove 3f, both the outer periphery and the inner periphery of the O-ring 6 abut against the side wall of the storage groove 3f, so that the frictional resistance of the O-ring 6 against the support member 2 is further increased. Thus, the rotation of the O-ring 6 relative to the support member can be further ensured.
[0029]
As a modification of the second embodiment of the present invention, although not shown in the drawings, a storage groove having the same shape as the storage groove 3f is formed on the opposing surface 8e of the operation member 8, and the opposing surface on the support member 2 side. May be formed flat.
In other words, a storage groove that can store the O-ring 6 may be provided on one of the opposing surfaces 3b and 8e of the operation member 8 or the support member 2, and a convex portion may be formed on the bottom surface of the storage groove.
[0030]
The support member 2 and the operation member 8 are made of a die-casting support member 2 and a synthetic resin having a frictional resistance smaller than that of the die-casting member. And the O-ring 6 can be more reliably prevented from rotating with respect to the support member 2.
The support member 2 and the operation member 8 may be formed of a synthetic resin, and the operation member 8 may be formed of a metal plate having a smaller frictional resistance than the synthetic resin.
[0031]
Moreover, although each convex part of 1st, 2nd embodiment of this invention demonstrated by what formed in multiple numbers in the direction orthogonal to the axial direction of the operating shaft 5, as shown to FIG. 7A, Further, the convex portion 3h made of a triangular pyramid, for example, having a triangular tip shape may be used. The convex portion 3h is not limited to a triangular pyramid, and may be a cone or a quadrangular pyramid.
Moreover, as shown to FIG. 7B, the convex part 3j which formed the front-end | tip shape in square shape may be sufficient.
[0032]
【The invention's effect】
In the rotary electric component of the present invention, the operation member and the support member are formed of materials having different frictional resistances, and the opposing surface of either the operation member or the support member elastically contacts the O-ring. In addition, since a convex portion for preventing the rotation of the O-ring is formed and a material having a large frictional resistance is used for the operation member or the support member on which the convex portion is formed, the O-ring is rotated. Can be attached to the operating member or the support member while being prevented from rotating by the convex portion.
Therefore, the operating shaft can create a constant rotational torque without variation, and a high-quality rotating electrical component can be provided.
Further, the opposing surfaces of the operation member and the support member are formed to face each other in a direction orthogonal to the axial direction of the operation shaft inserted through the operation member, and the convex of the operation member or the support member. Since the ring abutting portion on which the outer peripheral portion of the O-ring can abut is formed on the facing surface on the side where the portion is formed, the outer peripheral portion of the O-ring is not touched by the ring even when the operation member is repeatedly rotated. Since it is guided by the contact portion, the O-ring is not pushed outward in the outer peripheral direction, and the rotational torque can be further stabilized.
[0033]
Further, a storage groove capable of storing the O-ring is provided on the facing surface of either the operation member or the support member, and the convex portion is formed on the bottom surface of the storage groove, so that the storage groove is stored in the storage groove. In the O-ring, not only the outer peripheral portion but also the inner peripheral portion is guided by the storage groove, so that the movement can be surely restricted, and a high-quality rotary electric component that does not vary the rotational torque of the operation shaft can be provided.
[0034]
In addition, since the convex portions are formed in a plurality of lines so as to project in a direction orthogonal to the axial direction of the pair of operation shafts, the movement can be restricted in the rotation direction of the O-ring, and the rotational torque of the operation shaft can be stabilized. be able to.
[0035]
In addition, since the convex portion has a triangular or square tip shape, the O-ring can be reliably prevented from rotating even if the lubricant flows to the opposite surface where the O-ring is prevented from rotating. Can do.
[0036]
In addition, since the support member is formed by die casting and the operation member is made of synthetic resin, or the support member is made of synthetic resin and the operation member is made of a metal plate, a material having a high frictional resistance is formed on the member that prevents the O-ring from rotating. By using the O-ring, it is possible to more reliably prevent the O-ring from rotating.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a rotary electric component according to the present invention.
FIG. 2 is an exploded perspective view of a rotary electric component according to the present invention.
FIG. 3 is a plan view of a support member according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of a support member according to the first embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part showing the shape of a convex portion according to the present invention.
FIG. 6 is a cross-sectional view of a support member according to a second embodiment of the present invention.
FIG. 7 is a view showing a modification of the convex portion according to the present invention.
FIG. 8 is a cross-sectional view of a main part of a conventional rotating electrical component.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mounting plate 1a Claw part 2 Support member 3 Base part 3b Opposite surface 3c Ring contact part 3d Convex part 4 Bearing part 5 Operation shaft 6 O-ring 7 Shaft stop spring 8 Operation member 8a Conductive pattern 8b Insulator 8e Opposite surface 9 Driver 10 Rubber Rubber 11 Movable Contact 12 Insulating Case 13 Spacer

Claims

A rotatable operation member and a support member that rotatably supports the operation member are provided, and the support member and the operation member are opposed to each other in a direction orthogonal to the axial direction of the operation shaft inserted through the operation member. An annular O-ring is disposed in a gap formed by the opposing surfaces, and the O-ring is elastically held between the opposing surfaces, and the operation member and the support The member is formed of materials having different frictional resistances , and prevents the O-ring from rotating on the facing surface of either the operation member or the support member where the O-ring is elastically contacted. A rotary electric component characterized in that a material having a large frictional resistance is used for the operation member or the support member on which the convex portion is formed.

Before SL operating member, or to the opposing surface of the side where the convex portion is formed of the support member, claims, characterized in that the outer peripheral portion of the O-ring protrudes form the contactable ring abutment The rotating electrical component according to 1.

2. A storage groove capable of storing the O-ring is provided on the facing surface of either the operation member or the support member, and the convex portion is formed on the bottom surface of the storage groove. Rotating electrical parts.

The rotating electrical component according to claim 1, 2, or 3, wherein the convex portion is formed in a slender and linear shape in a direction crossing the O-ring.

The rotary electric component according to claim 1, 2, 3, or 4, wherein the convex portion has a tip shape formed in a triangular shape or a square shape.

6. The rotary mold according to claim 1, 2, 3, 4 or 5, wherein the support member is formed by die casting and the operation member is formed by synthetic resin, or the support member is formed by synthetic resin and the operation member is formed by a metal plate. Electrical component.