JP3593489B2 - Rotation detection sensor - Google Patents

Rotation detection sensor Download PDF

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Publication number
JP3593489B2
JP3593489B2 JP2000070566A JP2000070566A JP3593489B2 JP 3593489 B2 JP3593489 B2 JP 3593489B2 JP 2000070566 A JP2000070566 A JP 2000070566A JP 2000070566 A JP2000070566 A JP 2000070566A JP 3593489 B2 JP3593489 B2 JP 3593489B2
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JP2001264348A (en
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康弘 杉森
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Yazaki Corp
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Yazaki Corp
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  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、例えば、自動車のエンジンやミッション等に用いられるギヤの回転数を検出する回転検出用半導体式ピックアップセンサ等の回転検出センサに関する。
【0002】
【従来の技術】
この種の回転検出センサとして、図6〜図9に示す半導体式ピックアップセンサが知られている。この半導体式ピックアップセンサ1は、図6及び図8に示すように、一対の端子3,3とマグネット4を樹脂のインサート成形により一体形成した合成樹脂製のセンサ本体2と、このセンサ本体2の脚部2bと一対の端子3,3の各基端3a側を除く部分及びマグネット4等を収容して被覆する底有の合成樹脂製で略円筒状のケース7とを備えている。
【0003】
センサ本体2は、略円柱状の胴部2aとこの胴部2aの下部に一体突出形成された略半円柱状の脚部2bと上記胴部2aの一側部から横方向に水平に延びるように一体突出形成された底有で略円筒状のフード部2cとで側面略L字状になっている。センサ本体2の脚部2bの下側にはマグネット4をインサート成形してある。また、センサ本体2のフード部2c内にはその底面2dから外側に一対の端子3,3の各基端3aがそれぞれ露出していて、該各基端3aはフード部2cに嵌合される相手コネクタ8の図示しない一対の雌端子とそれぞれ電気的に接続されるようになっている。この各雌端子には電線Wを接続してある。
【0004】
一対の端子3,3はセンサ本体2の略中央に沿うようにL字状に折り曲げられていて、脚部2bに沿って露出した該一対の端子3,3の各中央部3bにはディスクリートタイプのコンデンサ5の一対のリード5a,5aを半田付けにより接続固定してある。また、一対の端子3,3の各先端3cには回転検出素子としてのホールIC6の一対のリード6a,6aを半田付けにより接続固定してある。このホールIC6とマグネット4から成る回転検出素子は、該マグネット4とギヤ(被検出体)9とで形成される磁気回路の磁束の変化を検出して該ギヤ9の回転数を検出するものである。
【0005】
合成樹脂製のケース7は、その開口部からセンサ本体2の脚部2bと一対の端子3,3とマグネット4及びホールIC6が収容される底有で略円筒状の筒部7aと該筒部7aの上端部から横方向に水平に延びるように一体突出形成されたフランジ部7bとで側面略L字状になっている。そして、ケース7の筒部7aの外周中央には環状凹部7cを形成してあり、該環状凹部7cにはゴム製のOリング7dを組み付けてある。
【0006】
また、図10に示すように、ケース7の筒部7aの上端面に形成された環状の溶着用突起7eをセンサ本体2の胴部2aの突き合わせ面2eに超音波溶着、或いは、オービタル振動溶着等の溶着工法で溶着固定している。さらに、図7に示すように、ケース7のフランジ部7bには取付用の丸孔7fを形成してあり、該丸孔7fに挿通される図示しないボルト等の締結手段を介して車体(被取付体)Sに取り付けられる。これにより、図6に示すように、半導体式ピックアップセンサ1のケース7側が自動車のエンジンやミッション等に用いられるギヤ9に近接される。そして、半導体式ピックアップセンサ1のマグネット4及びホールIC6で図6中矢印A方向に回転するギヤ9の凸部9aと凹部9bの凹凸が検出されて該ギヤ9の回転数が検出されるようになっている。
【0007】
【発明が解決しようとする課題】
前記従来の半導体式ピックアップセンサ1では、相手コネクタ8がゴム栓等の防水機能を有した防水コネクタになっているが、該半導体式ピックアップセンサ1を、激しい振動や車輪付近の水のかかる場所等の過酷な環境下で使用した場合に、嵌合接触したセンサ本体2の一対の端子3,3の各基端3aと相手コネクタ8の各雌端子との電気的導通性(接触信頼性)及び防水信頼性の低下が懸念されていた。
【0008】
そこで、本発明は、前記した課題を解決すべくなされたものであり、過酷な環境下で使用されても一対の端子の接触信頼性及び防水信頼性を向上させることができる回転検出センサを提供することを目的とする。
【0009】
【課題を解決するための手段】
請求項1の発明は、センサ本体に回転検出素子を一対の端子を介して組み付け、これら回転検出素子と一対の端子の各基端側を除く部分とをケースに収容して該ケースで被覆すると共に、該一対の端子の各基端側を前記センサ本体に形成した略筒状のフード部内の底面より外側にそれぞれ突出させて成る回転検出センサにおいて、前記一対の端子の各基端を前記フード部の上端よりも外側に露出するように突出形成すると共に、該一対の端子の各基端の全周を前記フード部の底面より突出形成したゴム栓止め用の樹脂被覆部で少なくとも該フード部の上端に対向する位置までそれぞれ被覆させ、この一対の樹脂被覆部より露出した前記一対の端子の各基端に一対のリード線の各芯線をそれぞれ接続し、かつこれら一対の端子の各基端と一対のリード線の各芯線とを該一対のリード線を貫通して前記ゴム栓止め用の一対の樹脂被覆部に嵌合される各ゴム栓でそれぞれ被覆自在にすると共に、前記一対のリード線を貫通して前記フード部に嵌合される非可撓性の防水キャップで被覆自在にしたことを特徴とする。
【0010】
この回転検出センサでは、センサ本体のフード部内より突出する一対の端子の各基端と該各基端に接続される一対のリード線の各芯線とを、該一対のリード線を貫通して一対の端子の各基端の全周を被覆したゴム栓止め用の一対の樹脂被覆部に嵌合される各ゴム栓で被覆自在にすると共に、一対のリード線を貫通してフード部に嵌合される非可撓性の防水キャップで被覆自在にしたので、一対の端子の各基端と一対のリード線の各芯線との電気的導通性及び防水信頼性が向上し、過酷な環境下での使用に際しても高性能が常に維持される。
【0011】
請求項2の発明は、請求項1記載の回転検出センサであって、前記非可撓性の防水キャップの略筒状の周壁部内に前記一対のゴム栓を収容するゴム栓収容室をそれぞれ形成し、かつ前記周壁部内の前記一対のゴム栓収容室の周囲に別のゴム栓を嵌合して前記フード部に前記非可撓性の防水キャップを嵌合する際に、前記別のゴム栓により前記フード部と前記一対のゴム栓収容室との間をシール自在にしたことを特徴とする。
【0012】
この回転検出センサでは、センサ本体のフード部と防水キャップとの間に隙間が生じてもフード部と防水キャップの一対のゴム栓収容室との間をシールする別のゴム栓によりフード部と防水キャップとの内部に水が浸入し難く、万一水が浸入しても防水キャップのゴム栓止め用の各樹脂被覆部及び該各樹脂被覆部に嵌合される各ゴム栓で一対の端子が別々に仕切られ、該一対の端子間での浸水によるショートが防止される。これにより、回転検出センサの防水信頼性が一段と向上し、該回転検出センサの出力異常の発生が確実に防止される。
【0013】
【発明の実施の形態】
以下、本発明の一実施形態を図面に基づいて説明する。
【0014】
図1は本発明の一実施形態の半導体式ピックアップセンサを示す側面図、図2は同センサの組み付け途中の状態を示す断面図、図3は同センサの平面図、図4は図3中X−X線に沿う断面図、図5は同センサのセンサ本体とケースの組み付け状態を示す側面図である。
【0015】
図2,図4に示すように、半導体式ピックアップセンサ(回転検出センサ)10は、一対の端子12,12を樹脂のインサート成形により一体形成した合成樹脂製のセンサ本体11と、このセンサ本体11の脚部11bと一対の端子12,12の各基端12a側を除く部分を収容して被覆する底有の合成樹脂製で略円筒状のケース15とを備えている。
【0016】
センサ本体11は、略円柱状の胴部11aとこの胴部11aの下部に一体突出形成された略半円柱状の脚部11bと上記胴部11aの上部に一体突出形成された底有で略楕円筒状のフード部11cとで略直線状になっている。このフード部11c内にはその底面11dから外側に一対の端子12,12の各基端12aがそれぞれ露出していて、該各基端12aには後述する一対のリード線17,17の各芯線17aを接続してある。
【0017】
一対の端子12,12の各基端12aと各中央部12bとの間の部分は樹脂のインサート成形によりセンサ本体11の胴部11aと一体になっている。また、図2,図4に示すように、一対の端子12,12の各基端12aの全周は、センサ本体11のフード部11cの底面11dより一体突出形成したゴム栓止め用の各樹脂被覆部11fで該フード部11cの上端に対向する位置までそれぞれ被覆されている。
【0018】
図2,図4に示すように、センサ本体11の脚部11bに沿って露出した一対の端子12,12の各中央部12bより下側にはディスクリートタイプのコンデンサ13の一対のリード13a,13aを半田付けにより接続固定してある。また、一対の端子12,12の各先端12cには回転検出素子としてのホールIC14の一対のリード14a,14aを半田付けにより接続固定してある。このホールIC14は図示しないマグネットを内蔵したものであり、該マグネットとギヤ(被検出体)9とで形成される磁気回路の磁束の変化を検出して該ギヤ9の回転数を検出するものである。
【0019】
合成樹脂製のケース15は、その開口部からセンサ本体11の脚部11bと一対の端子12,12の各基端12a側を除く部分とコンデンサ13及びホールIC14が収容される底有で略円筒状の筒部15aと該筒部15aの上端部から横方向に水平に延びるように一体突出形成されたフランジ部15bとで側面略L字状になっている。そして、ケース15の筒部15aの外周中央には環状凹部15cを形成してあり、該環状凹部15cにはゴム製のOリング16を組み付けてある。
【0020】
また、図2に示すように、ケース15の筒部15aの上端面の内周側に形成された環状の溶着用突起15eをセンサ本体11の胴部11aの下面外周に形成された突き合わせ面11eに超音波溶着、或いは、オービタル振動溶着等の溶着工法で溶着固定している。さらに、ケース15のフランジ部15bには取付用の丸孔15dを形成してあり、該丸孔15dに挿通される図示しないボルト等の締結手段を介して車体(被取付体)Sに取り付けられる。これにより、図1に示すように、半導体式ピックアップセンサ10のケース15側が自動車のエンジンやミッション等に用いられるギヤ9に近接されるようになっている。
【0021】
図2,図4に示すように、センサ本体11の略円筒状のフード部11c内のゴム栓止め用の一対の樹脂被覆部11f,11fより外側にそれぞれ突出して露出した一対の端子12,12の各基端12aには、一対のリード線17,17の各芯線17aを溶接によりそれぞれ接続してある。さらに、これら一対の端子12,12の各基端12aと一対のリード線17,17の各芯線17aは、一対のリード線17,17を貫通してフード部11cに嵌合される合成樹脂製の防水キャップ18及び一対のリード線17,17を貫通してゴム栓止め用の各樹脂被覆部11fに嵌合される各ゴム栓19でそれぞれ被覆されるようになっている。尚、この一対のリード線17,17は車両側の図示しない制御用コントローラに接続されている。
【0022】
図1〜図4に示すように、合成樹脂製(非可撓性)の防水キャップ18は、肉厚で平面略矩形状の天井壁部18aと、この天井壁部18aより下方に延びる略楕円筒状の周壁部18bとを備えている。防水キャップ18の天井壁部18aの中央には一対の電線貫通孔18c,18cをそれぞれ形成してある。
【0023】
また、防水キャップ18の周壁部18b内のゴム栓止め用の一対の樹脂被覆部11f,11fに対向する位置には、円筒状のゴム栓収容室18dをそれぞれ一体突出形成してある。この一対のゴム栓収容室18d,18dは各電線貫通孔18cに連通していると共に、周壁部18bの下端より外側に少し突出している。そして、各ゴム栓収容室18d内には各樹脂被覆部11fに圧入により嵌合される略円筒状で周面上側が凹凸状のゴム栓19が収容されるようになっている。
【0024】
さらに、防水キャップ18の周壁部18b内の一対のゴム栓収容室18d,18dの周囲には、略楕円筒状の別のゴム栓20を嵌め込んである。これにより、センサ本体11のフード部11cに防水キャップ18を嵌合する際に、防水キャップ18の周壁部18bの内周面とゴム栓20との間にフード部11cが嵌め込まれ、該ゴム栓20によりフード部11cと一対のゴム栓収容室18d,18dとの間がシールされるようになっている。尚、このフード部11cと防水キャップ18の嵌合状態は、フード部11cの外周面に一体突出形成された係止部11gと該係止部11gに係止される防水キャップ18に一体突出形成された可撓性の係合部18eとでロックされるようになっている。
【0025】
以上実施形態の半導体式ピックアップセンサ10は、図2に示すように、センサ本体11のフード部11c内のゴム栓止め用の一対の樹脂被覆部11f,11fより外に露出した一対の端子12,12の各基端12aに、一対のリード線17,17の各芯線17aを直接溶接にてそれぞれ接続し、その後、図4に示すように、一対のリード線17,17を貫通した防水キャップ18をフード部11cに嵌合させて組み付ける。この際、図4に示すように、一対の端子12,12の各基端12aの全周の下側を被覆するゴム栓止め用の各樹脂被覆部11fに、防水キャップ18の押圧により一対のリード線17,17を貫通した各ゴム栓19が圧入により嵌合されて各樹脂被覆部11fと各ゴム栓19とが一体となった状態で半導体式ピックアップセンサ10が完成する。この完成時に、図4に示すように、各ゴム栓19は防水キャップ18の各ゴム栓収容室18d内に収容されると共に、各ゴム栓19の上端部が電線貫通孔18cより僅かに外側に突出する。また、防水キャップ18の周壁部18bの内周面とゴム栓20との間にセンサ本体11のフード部11cが嵌め込まれ、該ゴム栓20によりフード部11cと一対のゴム栓収容室18d,18dとの間がシールされる。
【0026】
そして、この半導体式ピックアップセンサ10のフランジ部15bをボルト等の締結手段を介して車体Sに取り付け、図1に示すように、半導体式ピックアップセンサ10の樹脂製ケース15側を自動車のエンジンやミッション等に用いられるギヤ9に近接させる。これにより、半導体式ピックアップセンサ10のホールIC14で図1中矢印A方向に回転するギヤ9の凸部9aと凹部9bの凹凸が検出されて該ギヤ9の回転数が検出され、ギヤ9の回転数が制御用コントローラにより制御される。
【0027】
このように、センサ本体11のフード部11c内のゴム栓止め用の一対の樹脂被覆部11f,11fより露出した一対の端子12,12の各基端12aに一対のリード線17,17の各芯線17aを直接溶接でそれぞれ接続し、かつこれら一対の端子12,12の各基端12aと一対のリード線17,17の各芯線17aとをゴム栓止め用の一対の樹脂被覆部11f,11fに嵌合される各ゴム栓19でそれぞれ密閉状態で被覆自在にすると共に、該一対のリード線17,17を貫通してフード部11cに別のゴム栓20を介して隙間なく嵌合される防水キャップ18で更に被覆自在にしたので、一対の端子12,12の各基端12aと一対のリード線17,17の各芯線17aとの電気的導通性(接触信頼性)及び防水信頼性を向上させることができ、過度の振動や車輪付近の水のかかる場所等の過酷な環境下での使用に際しても半導体式ピックアップセンサ10は高性能を常に維持することができる。
【0028】
特に、防水キャップ18の略筒状の周壁部18b内に一対のゴム栓19,19を収容する各ゴム栓収容室18dをそれぞれ一体突出形成し、かつ該周壁部18b内の一対のゴム栓収容室18d,18dの周囲にゴム栓20を嵌合し、センサ本体11のフード部11cに防水キャップ18を嵌合する際に、ゴム栓20によりフード部11cと一対のゴム栓収容室18d,18dとの間をシール自在にしたので、センサ本体11のフード部11cと防水キャップ18の周壁部18bの下面との間に隙間が生じてもゴム栓20によりその内部に水が浸入し難く、万一水が浸入してもゴム栓止め用の各樹脂被覆部11f及び該各樹脂被覆部11fに嵌合される各ゴム栓19で一対の端子12,12を別々に確実に仕切ることができ、該一対の端子12,12間での浸水によるショートを確実に防止することができる。これにより、半導体式ピックアップセンサ10の防水信頼性をより一段と向上させることができると共に、一対の端子12,12の出力異常の発生を確実に防止することができ、高品質の半導体式ピックアップセンサ10を低コストで提供することができる。
【0029】
また、センサ本体11のフード部11cに防水キャップ18を嵌合する際に、ゴム栓止め用の各樹脂被覆部11fにより各ゴム栓19が一対のゴム栓収容室18d,18d内に自動的に収容されるため、半導体式ピックアップセンサ10の組み付け作業性を向上させることができ、低コスト化をより一段と図ることができる。
【0030】
尚、前記実施形態によれば、一対の端子の各基端と一対のリード線の各芯線とは直接溶接で接続するようにしたが、半田付け等の他の接続手段により接続するようにしてもよい。また、自動車のエンジンやミッション等に用いられるギヤの凹凸をホールICで検出して該ギヤの回転数を制御用コントローラで制御する半導体式ピックアップセンサについて説明したが、被検出体は自動車のエンジンやミッション等に用いられるギヤに限られるものではなく、他の被検出体の回転を検出する回転検出センサに前記実施形態を適用できることは勿論である。
【0031】
【発明の効果】
以上説明したように、請求項1の発明によれば、センサ本体のフード部内より突出する一対の端子の各基端と該各基端に接続される一対のリード線の各芯線とを、該一対のリード線を貫通して一対の端子の各基端の全周を被覆したゴム栓止め用の一対の樹脂被覆部に嵌合される各ゴム栓で被覆自在にすると共に、一対のリード線を貫通してフード部に嵌合される非可撓性の防水キャップで被覆自在にしたので、一対の端子の各基端と一対のリード線の各芯線との電気的導通性及び防水信頼性を向上させることができ、過酷な環境下での使用に際しても高性能を常に維持することができる。
【0032】
請求項2の発明によれば、非可撓性の防水キャップの略筒状の周壁部内に一対のゴム栓を収容するゴム栓収容室をそれぞれ形成し、かつ該周壁部内の一対のゴム栓収容室の周囲に別のゴム栓を嵌合してセンサ本体のフード部に非可撓性の防水キャップを嵌合する際に、別のゴム栓によりフード部と一対のゴム栓収容室との間をシール自在にしたので、センサ本体のフード部と防水キャップとの間に隙間が生じても別のゴム栓によりその内部に水が浸入し難く、万一水が浸入してもゴム栓止め用の各樹脂被覆部及び該各樹脂被覆部に嵌合される各ゴム栓で一対の端子を別々に仕切ることができ、該一対の端子間での浸水によるショートを確実に防止することができる。これにより、回転検出センサの防水信頼性をより一段と向上させることができると共に、出力異常の発生を確実に防止することができ、高品質の回転検出センサを低コストで提供することができる。
【図面の簡単な説明】
【図1】本発明の一実施形態の半導体式ピックアップセンサを示す側面図である。
【図2】上記半導体式ピックアップセンサの組み付け途中の状態を示す断面図である。
【図3】上記半導体式ピックアップセンサの平面図である。
【図4】図3中X−X線に沿う断面図である。
【図5】上記半導体式ピックアップセンサのセンサ本体とケースの組み付け状態を示す側面図である。
【図6】従来の半導体式ピックアップセンサの側面図である。
【図7】上記従来の半導体式ピックアップセンサの平面図である。
【図8】図7中Z−Z線に沿う断面図である。
【図9】上記従来の半導体式ピックアップセンサの使用状態を示す側面図である。
【図10】上記従来の半導体式ピックアップセンサのセンサ本体と樹脂製ケースとの溶着を説明する要部の拡大断面図である。
【符号の説明】
10 半導体式ピックアップセンサ(回転検出センサ)
11 センサ本体
11c フード部
11d 底面
11f,11f 一対の樹脂被覆部
12,12 一対の端子
12a 基端
14 ホールIC(回転検出素子)
17,17 一対のリード線
17a 芯線
18 非可撓性の防水キャップ
18d ゴム栓収容室
19 ゴム栓
20 別のゴム栓
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotation detection sensor such as a rotation detection semiconductor pickup sensor that detects the number of rotations of a gear used for an engine or a transmission of an automobile.
[0002]
[Prior art]
Semiconductor pickup sensors shown in FIGS. 6 to 9 are known as this type of rotation detection sensor. As shown in FIGS. 6 and 8, the semiconductor pickup sensor 1 has a sensor body 2 made of synthetic resin in which a pair of terminals 3, 3 and a magnet 4 are integrally formed by insert molding of a resin. A substantially cylindrical case 7 made of a synthetic resin with a bottom for accommodating and covering the leg 2b, the portion of the pair of terminals 3 except for the base end 3a side, and the magnet 4 and the like is provided.
[0003]
The sensor main body 2 has a substantially cylindrical body 2a, a substantially semi-cylindrical leg 2b integrally formed at a lower portion of the body 2a, and extends horizontally from one side of the body 2a. And a substantially cylindrical hood portion 2c having a bottom formed integrally with the hood portion 2c. A magnet 4 is insert-molded below the leg 2b of the sensor body 2. In the hood portion 2c of the sensor main body 2, the respective base ends 3a of the pair of terminals 3 are exposed to the outside from the bottom surface 2d, and the respective base ends 3a are fitted to the hood portion 2c. The pair of female terminals (not shown) of the mating connector 8 are electrically connected to each other. An electric wire W is connected to each of the female terminals.
[0004]
The pair of terminals 3, 3 is bent in an L-shape along the substantially center of the sensor main body 2, and each of the central portions 3b of the pair of terminals 3, 3 exposed along the leg 2b has a discrete type. The pair of leads 5a of the capacitor 5 are connected and fixed by soldering. Further, a pair of leads 6a, 6a of a Hall IC 6 as a rotation detecting element are connected and fixed to each tip 3c of the pair of terminals 3, 3 by soldering. The rotation detecting element including the Hall IC 6 and the magnet 4 detects a change in magnetic flux of a magnetic circuit formed by the magnet 4 and the gear (object to be detected) 9 to detect the rotation speed of the gear 9. is there.
[0005]
The synthetic resin case 7 has a bottomed substantially cylindrical tube portion 7a for accommodating the leg portion 2b of the sensor main body 2, a pair of terminals 3, 3 and the magnet 4 and the Hall IC 6 from its opening. A side surface is substantially L-shaped by a flange portion 7b formed integrally with the upper end portion 7a so as to extend horizontally in the horizontal direction from the upper end portion. An annular recess 7c is formed at the center of the outer periphery of the cylindrical portion 7a of the case 7, and an O-ring 7d made of rubber is attached to the annular recess 7c.
[0006]
Further, as shown in FIG. 10, an annular welding projection 7e formed on the upper end surface of the cylindrical portion 7a of the case 7 is ultrasonically welded or orbital vibration welded to the butting surface 2e of the body 2a of the sensor body 2. Are fixed by welding. Further, as shown in FIG. 7, a round hole 7f for mounting is formed in the flange portion 7b of the case 7, and the vehicle body (covered) is fastened through fastening means such as bolts (not shown) inserted into the round hole 7f. Mounting body) S. As a result, as shown in FIG. 6, the case 7 side of the semiconductor pickup sensor 1 is brought close to the gear 9 used for the engine or the transmission of the automobile. The protrusions 9a and recesses 9b of the gear 9 rotating in the direction of arrow A in FIG. 6 are detected by the magnet 4 and the Hall IC 6 of the semiconductor pickup sensor 1 so that the rotation speed of the gear 9 is detected. Has become.
[0007]
[Problems to be solved by the invention]
In the conventional semiconductor pickup sensor 1, the mating connector 8 is a waterproof connector having a waterproof function such as a rubber stopper. When used in a harsh environment, the electrical continuity (contact reliability) between the base ends 3a of the pair of terminals 3 of the sensor body 2 and the female terminals of the mating connector 8, There was concern that the reliability of waterproofing would be reduced.
[0008]
Accordingly, the present invention has been made to solve the above-described problem, and provides a rotation detection sensor that can improve the contact reliability and waterproof reliability of a pair of terminals even when used in a severe environment. The purpose is to do.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, a rotation detecting element is assembled to a sensor body via a pair of terminals, and the rotation detecting element and portions of the pair of terminals except for the base ends are housed in a case and covered with the case. A rotation detection sensor having the base ends of the pair of terminals projecting outward from the bottom surface of a substantially cylindrical hood formed in the sensor main body, wherein the base ends of the pair of terminals are connected to the hood. The pair of terminals are formed so as to be exposed to the outside of the upper end thereof, and the entire periphery of each base end of the pair of terminals is formed at least by a rubber cover-stopping resin coating formed from the bottom surface of the hood. The cores of a pair of lead wires are respectively connected to the base ends of the pair of terminals exposed from the pair of resin coating portions, and the base ends of the pair of terminals. And a pair Each core wire of the lead wire passes through the pair of lead wires, and is freely covered with each rubber plug fitted to the pair of resin covering portions for rubber plug stopper. It is characterized in that it can be covered with a non-flexible waterproof cap that penetrates and is fitted to the hood.
[0010]
In this rotation detection sensor, each base end of a pair of terminals protruding from the inside of the hood portion of the sensor body and each core wire of a pair of lead wires connected to each base end are passed through the pair of lead wires to form a pair. The terminal can be covered with a pair of rubber stoppers that cover the entire circumference of the base end of each terminal, and can be covered with a pair of resin covering portions for rubber stoppers. Insulation resistance and waterproof reliability between each base end of a pair of terminals and each core wire of a pair of lead wires are improved because they can be covered with a non-flexible waterproof cap. The high performance is always maintained even when using.
[0011]
The invention according to claim 2 is the rotation detection sensor according to claim 1, wherein a rubber stopper accommodating chamber for accommodating the pair of rubber stoppers is formed in a substantially cylindrical peripheral wall portion of the inflexible waterproof cap. And when fitting another rubber stopper around the pair of rubber stopper accommodating chambers in the peripheral wall portion and fitting the non-flexible waterproof cap to the hood portion, Thus, the space between the hood portion and the pair of rubber stopper accommodating chambers can be freely sealed.
[0012]
In this rotation detection sensor, even if a gap is formed between the hood of the sensor body and the waterproof cap, the hood and the waterproof cap are sealed by another rubber stopper that seals between the hood and the pair of rubber stopper accommodating chambers of the waterproof cap. It is difficult for water to enter the inside of the cap, and even if water does enter, a pair of terminals is formed by each resin coating for rubber stopper of the waterproof cap and each rubber stopper fitted to each resin coating. The terminals are separated from each other to prevent short-circuits caused by water between the pair of terminals. Thereby, the waterproof reliability of the rotation detection sensor is further improved, and occurrence of output abnormality of the rotation detection sensor is reliably prevented.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a side view showing a semiconductor pickup sensor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state in which the sensor is being assembled, FIG. 3 is a plan view of the sensor, and FIG. FIG. 5 is a cross-sectional view taken along line X-ray, and FIG. 5 is a side view showing an assembled state of the sensor body and the case of the same sensor.
[0015]
As shown in FIGS. 2 and 4, a semiconductor pickup sensor (rotation detection sensor) 10 includes a sensor body 11 made of synthetic resin in which a pair of terminals 12, 12 are integrally formed by resin insert molding, and a sensor body 11. And a substantially cylindrical case 15 made of a synthetic resin with a bottom for accommodating and covering portions of the pair of terminals 12 and 12 except for the base end 12a side.
[0016]
The sensor main body 11 has a substantially cylindrical body 11a, a substantially semi-cylindrical leg 11b integrally formed below the body 11a, and a bottom integrally formed above the body 11a. It is substantially linear with the elliptical cylindrical hood 11c. Inside the hood portion 11c, base ends 12a of a pair of terminals 12, 12 are exposed to the outside from a bottom surface 11d, and each base end 12a has a core wire of a pair of lead wires 17, 17, which will be described later. 17a is connected.
[0017]
A portion between each base end 12a of the pair of terminals 12, 12 and each central portion 12b is integrated with the body 11a of the sensor main body 11 by insert molding of resin. As shown in FIGS. 2 and 4, the entire periphery of each base end 12a of the pair of terminals 12 and 12 is formed of a respective resin for stoppering rubber stoppers integrally formed from the bottom surface 11d of the hood 11c of the sensor body 11. The covering portion 11f covers the hood portion 11c up to a position facing the upper end thereof.
[0018]
As shown in FIGS. 2 and 4, a pair of leads 13 a, 13 a of a discrete type capacitor 13 are provided below a central portion 12 b of the pair of terminals 12, 12 exposed along the leg 11 b of the sensor body 11. Are connected and fixed by soldering. Further, a pair of leads 14a, 14a of a Hall IC 14 as a rotation detecting element are connected and fixed to each end 12c of the pair of terminals 12, 12 by soldering. The Hall IC 14 has a built-in magnet (not shown), and detects a change in magnetic flux of a magnetic circuit formed by the magnet and the gear (detected body) 9 to detect the rotation speed of the gear 9. is there.
[0019]
The case 15 made of a synthetic resin has a bottom and a substantially cylindrical shape that accommodates the portion excluding the legs 11 b of the sensor body 11 and the base ends 12 a of the pair of terminals 12 and 12 from the opening thereof, and the capacitor 13 and the Hall IC 14. A cylindrical portion 15a and a flange portion 15b integrally formed so as to extend horizontally and horizontally from the upper end of the cylindrical portion 15a form a substantially L-shaped side surface. An annular recess 15c is formed in the center of the outer periphery of the cylindrical portion 15a of the case 15, and an O-ring 16 made of rubber is attached to the annular recess 15c.
[0020]
As shown in FIG. 2, an annular welding projection 15 e formed on the inner peripheral side of the upper end surface of the cylindrical portion 15 a of the case 15 is joined to an abutting surface 11 e formed on the outer periphery of the lower surface of the body 11 a of the sensor main body 11. Are fixed by welding such as ultrasonic welding or orbital vibration welding. Further, a round hole 15d for mounting is formed in the flange portion 15b of the case 15, and the case 15 is mounted on the vehicle body (the body to be mounted) S via fastening means such as a bolt (not shown) inserted through the round hole 15d. . As a result, as shown in FIG. 1, the case 15 side of the semiconductor pickup sensor 10 is brought close to the gear 9 used for an engine or a transmission of an automobile.
[0021]
As shown in FIGS. 2 and 4, a pair of terminals 12, 12 protruding and exposed outside a pair of resin covering portions 11 f, 11 f for stoppering rubber in a substantially cylindrical hood portion 11 c of the sensor main body 11. The base wires 12a of the pair of lead wires 17 are connected to the respective base ends 12a by welding. Further, the base ends 12a of the pair of terminals 12, 12 and the core wires 17a of the pair of lead wires 17, 17 are made of a synthetic resin that penetrates the pair of lead wires 17, 17 and is fitted to the hood portion 11c. Are covered with rubber plugs 19 which penetrate through the waterproof cap 18 and the pair of lead wires 17 and 17 and are fitted to the respective resin coating portions 11f for rubber plug stopper. The pair of leads 17 is connected to a control controller (not shown) on the vehicle side.
[0022]
As shown in FIGS. 1 to 4, a waterproof cap 18 made of synthetic resin (non-flexible) has a thick, substantially rectangular ceiling wall 18 a and a substantially elliptical extending downward from the ceiling wall 18 a. And a cylindrical peripheral wall portion 18b. A pair of electric wire through holes 18c, 18c are formed in the center of the ceiling wall 18a of the waterproof cap 18, respectively.
[0023]
Further, a cylindrical rubber plug accommodating chamber 18d is integrally formed at a position in the peripheral wall portion 18b of the waterproof cap 18 opposite to the pair of resin covering portions 11f, 11f for fixing the rubber plug. The pair of rubber stopper accommodating chambers 18d, 18d communicate with the respective electric wire through holes 18c and slightly protrude from the lower ends of the peripheral wall portions 18b. The rubber plug housing chamber 18d accommodates a rubber plug 19 having a substantially cylindrical shape and an uneven upper surface, which is fitted into each resin coating portion 11f by press fitting.
[0024]
Further, another rubber plug 20 having a substantially elliptical cylindrical shape is fitted around the pair of rubber plug storage chambers 18d, 18d in the peripheral wall portion 18b of the waterproof cap 18. Thus, when the waterproof cap 18 is fitted to the hood 11c of the sensor main body 11, the hood 11c is fitted between the inner peripheral surface of the peripheral wall 18b of the waterproof cap 18 and the rubber plug 20. 20 seals the space between the hood portion 11c and the pair of rubber stopper accommodating chambers 18d, 18d. The fitting state of the hood portion 11c and the waterproof cap 18 is such that the locking portion 11g integrally formed on the outer peripheral surface of the hood portion 11c and the waterproof cap 18 locked by the locking portion 11g are integrally formed. It is configured to be locked with the provided flexible engaging portion 18e.
[0025]
As shown in FIG. 2, the semiconductor pickup sensor 10 of the embodiment described above has a pair of terminals 12, which are exposed outside a pair of resin covering portions 11 f, 11 f for stoppering rubber in the hood portion 11 c of the sensor body 11. The respective core wires 17a of the pair of lead wires 17, 17 are directly connected to the respective base ends 12a of the pair 12 by welding, and then, as shown in FIG. 4, a waterproof cap 18 penetrating the pair of lead wires 17, 17. To the hood portion 11c. At this time, as shown in FIG. 4, the waterproof cap 18 presses the pair of terminals 12, 12 on the respective resin coating portions 11 f for rubber stopper covering the lower portions of the entire circumferences of the base ends 12 a of the pair of terminals 12. Each of the rubber plugs 19 penetrating through the lead wires 17, 17 is fitted by press-fitting, and the semiconductor pickup sensor 10 is completed in a state where each of the resin covering portions 11f and each of the rubber plugs 19 are integrated. At the time of completion, as shown in FIG. 4, each rubber plug 19 is accommodated in each rubber plug accommodation chamber 18d of the waterproof cap 18, and the upper end of each rubber stopper 19 is slightly outside the electric wire through hole 18c. Protrude. The hood 11c of the sensor main body 11 is fitted between the inner peripheral surface of the peripheral wall 18b of the waterproof cap 18 and the rubber plug 20, and the hood 11c and the pair of rubber plug storage chambers 18d, 18d are fitted by the rubber plug 20. Is sealed.
[0026]
Then, the flange portion 15b of the semiconductor pickup sensor 10 is attached to the vehicle body S via fastening means such as bolts, and as shown in FIG. And the like. Thereby, the projections 9a and the depressions 9b of the gear 9 rotating in the direction of arrow A in FIG. 1 are detected by the Hall IC 14 of the semiconductor pickup sensor 10, and the rotation speed of the gear 9 is detected. The number is controlled by the controlling controller.
[0027]
As described above, each of the pair of lead wires 17, 17 is connected to the base end 12 a of the pair of terminals 12, 12 exposed from the pair of resin covering portions 11 f, 11 f for stoppering the rubber plug in the hood portion 11 c of the sensor body 11. The core wires 17a are directly connected by welding, and the base ends 12a of the pair of terminals 12, 12 and the core wires 17a of the pair of lead wires 17, 17 are paired with a pair of resin covering portions 11f, 11f for stoppering rubber. Each of the rubber plugs 19 is fitted in a sealed state so as to be freely sealed, and penetrates the pair of lead wires 17 and 17 and is fitted into the hood portion 11c via another rubber plug 20 without any gap. Since the waterproof cap 18 is further covered, the electrical continuity (contact reliability) and the waterproof reliability between each base end 12a of the pair of terminals 12 and 12 and each core 17a of the pair of lead wires 17 and 17 are improved. Improve Bets can be, semiconductor pickup sensor 10 is also in use in harsh environments where such water splashes near excessive vibration and wheel can always maintain high performance.
[0028]
In particular, each rubber plug accommodating chamber 18d for accommodating a pair of rubber plugs 19, 19 is integrally formed in a substantially cylindrical peripheral wall portion 18b of the waterproof cap 18, and a pair of rubber plug housings in the peripheral wall portion 18b are formed. When the rubber stopper 20 is fitted around the chambers 18d and 18d and the waterproof cap 18 is fitted to the hood 11c of the sensor body 11, the rubber stopper 20 and the hood 11c and the pair of rubber stopper housings 18d and 18d are used. Can be sealed freely, so that even if a gap is formed between the hood portion 11c of the sensor main body 11 and the lower surface of the peripheral wall portion 18b of the waterproof cap 18, water hardly penetrates into the inside by the rubber stopper 20, and Even if water invades, the pair of terminals 12, 12 can be separated from each other by the respective resin coating portions 11f for fixing the rubber plugs and the respective rubber plugs 19 fitted to the respective resin coating portions 11f. The pair of terminals 12 It is possible to reliably prevent the short circuit due to flooding of between 12. Thereby, the waterproof reliability of the semiconductor pickup sensor 10 can be further improved, and the occurrence of output abnormality of the pair of terminals 12 can be reliably prevented. Can be provided at low cost.
[0029]
When the waterproof cap 18 is fitted to the hood 11c of the sensor body 11, each rubber plug 19 is automatically inserted into the pair of rubber plug storage chambers 18d, 18d by the resin coating portions 11f for rubber plug stopper. As a result, the workability of assembling the semiconductor pickup sensor 10 can be improved, and the cost can be further reduced.
[0030]
According to the embodiment, each base end of the pair of terminals and each core wire of the pair of lead wires are connected directly by welding, but are connected by other connection means such as soldering. Is also good. In addition, the semiconductor pickup sensor that detects unevenness of a gear used for an automobile engine or a transmission with a Hall IC and controls the number of revolutions of the gear with a control controller has been described. The present invention is not limited to gears used for missions and the like, and it is needless to say that the embodiment can be applied to a rotation detection sensor that detects the rotation of another object to be detected.
[0031]
【The invention's effect】
As described above, according to the invention of claim 1, each base end of a pair of terminals protruding from inside the hood portion of the sensor main body and each core wire of a pair of lead wires connected to each base end are formed by Each of the rubber plugs that penetrate the pair of leads and cover the entire periphery of the base end of the pair of terminals and that is fitted to the pair of resin coating portions for rubber stoppers, and that can be freely covered with the rubber plugs. And a non-flexible waterproof cap that fits into the hood portion through the connector, so that electrical conductivity and waterproof reliability between each base end of the pair of terminals and each core wire of the pair of lead wires are ensured. Can be improved, and high performance can always be maintained even when used in a severe environment.
[0032]
According to the second aspect of the present invention, a rubber plug accommodating chamber for accommodating a pair of rubber plugs is formed in a substantially cylindrical peripheral wall of the non-flexible waterproof cap, and a pair of rubber plugs are accommodated in the peripheral wall. When another rubber stopper is fitted around the chamber and an inflexible waterproof cap is fitted to the hood of the sensor body, another rubber stopper is used to connect the hood to the pair of rubber stoppers. Can be sealed freely, so even if there is a gap between the hood of the sensor body and the waterproof cap, it is difficult for water to enter into the inside by another rubber stopper, even if water invades. The pair of terminals can be separately partitioned by the respective resin coating portions and the respective rubber plugs fitted to the respective resin coating portions, and a short circuit due to water infiltration between the pair of terminals can be reliably prevented. Thereby, the waterproof reliability of the rotation detection sensor can be further improved, and the occurrence of output abnormality can be reliably prevented, and a high-quality rotation detection sensor can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is a side view showing a semiconductor pickup sensor according to one embodiment of the present invention.
FIG. 2 is a sectional view showing a state in which the semiconductor pickup sensor is being assembled.
FIG. 3 is a plan view of the semiconductor pickup sensor.
FIG. 4 is a sectional view taken along line XX in FIG. 3;
FIG. 5 is a side view showing an assembled state of a sensor main body and a case of the semiconductor pickup sensor.
FIG. 6 is a side view of a conventional semiconductor pickup sensor.
FIG. 7 is a plan view of the conventional semiconductor pickup sensor.
FIG. 8 is a sectional view taken along the line ZZ in FIG. 7;
FIG. 9 is a side view showing a use state of the conventional semiconductor pickup sensor.
FIG. 10 is an enlarged sectional view of a main part for explaining welding of the sensor body and the resin case of the conventional semiconductor pickup sensor.
[Explanation of symbols]
10. Semiconductor pickup sensor (rotation detection sensor)
11 Sensor body 11c Hood 11d Bottom surface 11f, 11f A pair of resin coatings 12, 12 A pair of terminals 12a Base end 14 Hall IC (rotation detecting element)
17, 17 A pair of lead wires 17a Core wire 18 Non-flexible waterproof cap 18d Rubber stopper housing chamber 19 Rubber stopper 20 Another rubber stopper

Claims (2)

センサ本体に回転検出素子を一対の端子を介して組み付け、これら回転検出素子と一対の端子の各基端側を除く部分とをケースに収容して該ケースで被覆すると共に、該一対の端子の各基端側を前記センサ本体に形成した略筒状のフード部内の底面より外側にそれぞれ突出させて成る回転検出センサにおいて、
前記一対の端子の各基端を前記フード部の上端よりも外側に露出するように突出形成すると共に、該一対の端子の各基端の全周を前記フード部の底面より突出形成したゴム栓止め用の樹脂被覆部で少なくとも該フード部の上端に対向する位置までそれぞれ被覆させ、この一対の樹脂被覆部より露出した前記一対の端子の各基端に一対のリード線の各芯線をそれぞれ接続し、かつこれら一対の端子の各基端と一対のリード線の各芯線とを該一対のリード線を貫通して前記ゴム栓止め用の一対の樹脂被覆部に嵌合される各ゴム栓でそれぞれ被覆自在にすると共に、前記一対のリード線を貫通して前記フード部に嵌合される非可撓性の防水キャップで被覆自在にしたことを特徴とする回転検出センサ。
A rotation detecting element is assembled to the sensor body via a pair of terminals, and these rotation detecting elements and portions of the pair of terminals excluding the base end sides are accommodated in a case and covered with the case. In a rotation detection sensor in which each base end side is projected outward from a bottom surface in a substantially cylindrical hood portion formed in the sensor main body,
A rubber plug formed so that each base end of the pair of terminals is exposed outside the upper end of the hood portion, and the entire periphery of each base end of the pair of terminals is formed to protrude from the bottom surface of the hood portion. Each of the cores of a pair of lead wires is connected to each of the base ends of the pair of terminals exposed from the pair of resin coating portions at least to a position facing the upper end of the hood portion with a resin coating portion for stopping. And each base end of these pair of terminals and each core wire of a pair of lead wires are passed through the pair of lead wires, and are fitted with the rubber stoppers fitted into the pair of resin covering portions for rubber stopper locking. A rotation detection sensor, wherein each of the rotation detection sensors is made freely coverable and can be covered with a non-flexible waterproof cap that penetrates the pair of lead wires and fits into the hood portion.
請求項1記載の回転検出センサであって、
前記非可撓性の防水キャップの略筒状の周壁部内に前記一対のゴム栓を収容するゴム栓収容室をそれぞれ形成し、かつ前記周壁部内の前記一対のゴム栓収容室の周囲に別のゴム栓を嵌合して前記フード部に前記非可撓性の防水キャップを嵌合する際に、前記別のゴム栓により前記フード部と前記一対のゴム栓収容室との間をシール自在にしたことを特徴とする回転検出センサ。
The rotation detection sensor according to claim 1,
A rubber stopper accommodating chamber for accommodating the pair of rubber stoppers is formed in a substantially cylindrical peripheral wall of the inflexible waterproof cap, and another rubber stopper accommodating chamber is provided around the pair of rubber stopper accommodating chambers in the peripheral wall. When the rubber stopper is fitted and the non-flexible waterproof cap is fitted to the hood, the separate rubber stopper can seal between the hood and the pair of rubber stopper accommodating chambers. A rotation detection sensor characterized in that:
JP2000070566A 2000-03-14 2000-03-14 Rotation detection sensor Expired - Fee Related JP3593489B2 (en)

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