JP2019002412A - クラッチ装置及びクラッチ装置の制御方法 - Google Patents
クラッチ装置及びクラッチ装置の制御方法 Download PDFInfo
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Abstract
【解決手段】駆動力伝達制御装置1は、クラッチハブ21及びクラッチドラム22と、インナクラッチプレート231及びアウタクラッチプレート232からなる多板クラッチ23と、多板クラッチ23を押圧するピストン20と、電動モータ31と、電動モータ31の回転量に応じてピストン20を軸方向移動させる移動機構部30と、電動モータ31を制御する制御部4とを備える。制御部4は、電動モータ31に供給する電流を増大させてクラッチハブ21とクラッチドラム22との間で伝達される回転力を高める際、一時的にクラッチハブ21とクラッチドラム22との間で伝達すべき目標回転力に応じた電流よりも大きな電流を電動モータ31に供給してピストン20を軸方向に移動させる。
【選択図】図7
Description
本発明の第1の実施の形態について、図1乃至図8を参照して説明する。なお、以下に説明する実施の形態は、本発明を実施する上での好適な具体例として示すものであり、技術的に好ましい種々の技術的事項を具体的に例示している部分もあるが、本発明の技術的範囲は、この具体的態様に限定されるものではない。
図2は、駆動力配分機構14の構成例を示す断面図である。図3は、図2の部分拡大図である。
クラッチ部2は、油圧ユニット3から供給される作動油(作動流体)の圧力によって動作する押圧部材としてのピストン20と、中間シャフト108と一体に回転する第1の回転部材としてのクラッチハブ21と、ドライブシャフト107Lと一体に回転する第2の回転部材としてのクラッチドラム22と、クラッチハブ21とクラッチドラム22との間に配置された多板クラッチ23と、ピストン20と多板クラッチ23との間に配置されたプレッシャプレート24及びスラストころ軸受25と、クラッチハブ21とプレッシャプレート24との間に配置されたリターンスプリング26とを有している。クラッチハブ21とクラッチドラム22とは、回転軸線Oを共有しており、同一回転軸線上で相対回転可能である。
図6は、駆動力伝達制御装置1のクラッチ部2、油圧ユニット3、及び制御部4を模式的に示す構成図である。油圧ユニット3は、供給される電流に応じたトルクを発生する電動モータ31と、電動モータ31によって駆動される油圧ポンプ32と、油圧ポンプ32から吐出された作動油の一部をリザーバ33に還流させる固定絞り弁34とを有している。電動モータ31と油圧ポンプ32とは、連結軸311によって連結されている。電動モータ31は、例えば三相ブラシレスDCモータであるが、電動モータ31としてブラシ付きのDCモータを用いてもよい。
次に、駆動力伝達制御装置1の制御方法の具体例について、図7を参照して説明する。図7は、演算処理装置42が実行する処理手順の具体例を示すフローチャートである。このフローチャートに示す処理は、四輪駆動車100の駆動状態が二輪駆動状態から四輪駆動状態に移行する際に実行される処理であり、演算処理装置42は、所定の制御周期ごとにこの処理を実行する。
以上説明した本発明の第1の実施の形態によれば、電動モータ31に供給する電流を増大させてクラッチハブ21とクラッチドラム22との間で伝達される回転力を高める際、一時的に目標回転力に応じた電流よりも大きな電流を電動モータ31に供給してピストン20を軸方向に移動させるので、駆動力伝達制御装置1の作動時における応答性を高めることができる。これにより、ピストン20が初期位置にあるときのインナクラッチプレート231とアウタクラッチプレート232との隙間を広くして多板クラッチ23の引き摺りトルクを抑制しながらも、四輪駆動車100の二輪駆動状態から四輪駆動状態への切り替えを速やかに行うことが可能となる。
図10は、第1の実施の形態の変形例に係る駆動力伝達制御装置1Aの構成を模式的に示す構成図である。この駆動力伝達制御装置1Aは、第1の実施の形態に説明したものと同様のクラッチ部2及び制御部4を有しているが、油圧ユニット3Aの構成が第1の実施の形態とは異なっている。具体的には、油圧ユニット3Aが、電動モータ31、油圧ポンプ32、及び固定絞り弁34に加え、制御部4から供給される電流に応じて弁開度が変化する制御弁35をさらに有している。油圧ポンプ32、固定絞り弁34、及び制御弁35は、移動機構部30Aを構成する。
次に、図11乃至図15を参照して本発明の第2の実施の形態について説明する。本実施の形態では、四輪駆動車100の駆動力伝達系101の構成、及びクラッチ装置としての駆動力伝達制御装置1Bの構成が、第1の実施の形態と異なる。
以上、本発明を第1及び第2の実施の形態に基づいて説明したが、これらの実施の形態は特許請求の範囲に係る発明を限定するものではない。また、実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない点に留意すべきである。
20…ピストン(押圧部材)
21…クラッチハブ(第1の回転部材)
22…クラッチドラム(第2の回転部材)
23…多板クラッチ
231…インナクラッチプレート(第1のクラッチプレート)
232…アウタクラッチプレート(第2のクラッチプレート)
30,30A…移動機構部
31…電動モータ
32…油圧ポンプ
35…制御弁
4,4B…制御部
5…多板クラッチ
51…アウタクラッチプレート(第2のクラッチプレート)
52…インナクラッチプレート(第1のクラッチプレート)
53…クラッチドラム(第2の回転部材)
54…クラッチハブ(第1の回転部材)
55…押圧部材
6…移動機構部
60…電動モータ
Claims (7)
- 同一回転軸線上で相対回転可能な第1及び第2の回転部材と、前記第1の回転部材と一体に回転する第1のクラッチプレート及び前記第2の回転部材と一体に回転する第2のクラッチプレートを軸方向に配置してなる多板クラッチと、前記多板クラッチを押圧する押圧部材と、供給される電流に応じたトルクを発生する電動モータと、前記電動モータの回転量に応じて前記押圧部材を軸方向に移動させる移動機構部と、前記電動モータを制御する制御部とを備え、前記多板クラッチを介して前記第1及び第2の回転部材間で伝達される回転力を調節可能なクラッチ装置であって、
前記制御部は、前記電動モータに供給する電流を増大させて前記第1及び第2の回転部材間で伝達される回転力を高める際、一時的に前記第1及び第2の回転部材間で伝達すべき目標回転力に応じた電流よりも大きな電流を前記電動モータに供給して前記押圧部材を軸方向に移動させる、
クラッチ装置。 - 前記制御部は、前記押圧部材が前記多板クラッチから離間した位置にある初期状態からの前記電動モータの回転量を累積した累積回転量を演算すると共に、前記電動モータに供給する電流を増大させて前記第1及び第2の回転部材間で伝達される回転力を高める際、前記累積回転量が前記目標回転力に応じた回転量よりも少ない特定値となるまで前記目標回転力に応じた電流よりも大きな電流を前記電動モータに供給し、前記累積回転量が前記特定値となった後に前記目標回転力に応じた電流を前記電動モータに供給する、
請求項1に記載のクラッチ装置。 - 前記制御部は、前記目標回転力が大きいほど前記特定値を大きく設定する、
請求項2に記載のクラッチ装置。 - 前記移動機構部は、前記電動モータによって駆動されるポンプを有し、前記ポンプから吐出された作動流体が供給されるシリンダ室の圧力によって前記押圧部材を前記多板クラッチ側に移動させる、
請求項1乃至3の何れか1項に記載のクラッチ装置。 - 前記移動機構部は、前記ポンプと前記シリンダ室との間に配置され、前記制御部から供給される電流に応じて弁開度が変化する制御弁をさらに有し、
前記制御部は、前記目標回転力に応じた電流よりも大きな電流を前記電動モータに供給している間、前記制御弁の弁開度を前記目標回転力に応じた弁開度よりも大きくする、
請求項4に記載のクラッチ装置。 - 前記移動機構部は、第1カム部材と第2カム部材との相対回転によって軸方向の推力を発生するカム機構を有し、前記電動モータの回転によって第1カム部材と第2カム部材とが相対回転する、
請求項1乃至5の何れか1項に記載のクラッチ装置。 - 同一回転軸線上で相対回転可能な第1及び第2の回転部材と、前記第1の回転部材と一体に回転する第1のクラッチプレート及び前記第2の回転部材と一体に回転する第2のクラッチプレートを軸方向に配置してなる多板クラッチと、前記多板クラッチを押圧する押圧部材と、供給される電流に応じたトルクを発生する電動モータと、前記電動モータの回転量に応じて前記押圧部材を軸方向に移動させる移動機構部とを備え、前記多板クラッチを介して前記第1及び第2の回転部材間で伝達される回転力を調節可能なクラッチ装置の制御方法であって、
前記電動モータに供給する電流を増大させて前記第1及び第2の回転部材間で伝達される回転力を高める際、一時的に前記第1及び第2の回転部材間で伝達すべき目標回転力に応じた電流よりも大きな電流を前記電動モータに供給して前記押圧部材を軸方向に移動させる、
クラッチ装置の制御方法。
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