JP2017166501A

JP2017166501A - Method for controlling inverse input prevention clutch

Info

Publication number: JP2017166501A
Application number: JP2016049259A
Authority: JP
Inventors: 幸宏西尾; Yukihiro Nishio; 寛哲徳永; Hiroaki Tokunaga
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2016-03-14
Filing date: 2016-03-14
Publication date: 2017-09-21

Abstract

PROBLEM TO BE SOLVED: To enable a locked state and a lock released holding state to be accurately discriminated in a method for controlling lock type inverse input prevention clutch having a lock released state holding means.SOLUTION: This invention is one of the members constituting a lock released holding means of an inverse input prevention clutch in which an outer periphery of a control holder 7 driven by an electromagnetic clutch 11 and moved in an axial direction is provided with two annular sensor detecting parts 7e, 7f, sensors 23, 24 opposing against each of these sensor detecting parts 7e, 7f are arranged at an inner periphery of a housing 4, one sensor 23 is applied to detect that the control holder 7 is placed at a position where the control holder 7 is not driven by the electromagnetic clutch 11, the other sensor 24 is applied to detect that the control holder 7 is placed at a position where the control holder 7 is driven by the electromagnetic clutch 11, and judgement about the locked state and the lock released holding state can be accurately carried out on the basis of the detection results of these sensors 23, 24.SELECTED DRAWING: Figure 6

Description

本発明は、入力トルクが加えられたときは入力側の回転を出力側に伝達し、逆入力トルクに対しては入力側が回転しないようにする逆入力防止クラッチの制御方法に関する。 The present invention relates to a control method for a reverse input prevention clutch that transmits input side rotation to an output side when input torque is applied and prevents the input side from rotating in response to reverse input torque.

逆入力防止クラッチは、入力側に入力トルクが加えられたときは、その回転を出力側に伝達し、出力側に逆入力トルクが加えられたときは、入力側が回転しないようにするものである。この逆入力防止クラッチには、逆入力トルクに対して出力側をロックさせる方式（以下、この方式を「ロック式」と称する。）のものがある（例えば、特許文献１参照。）。 The reverse input prevention clutch transmits the rotation to the output side when input torque is applied to the input side, and prevents the input side from rotating when reverse input torque is applied to the output side. . There is a type of the reverse input prevention clutch that locks the output side against the reverse input torque (hereinafter, this method is referred to as “lock type”) (see, for example, Patent Document 1).

上記特許文献１に記載されたロック式の逆入力防止クラッチは、同一軸心のまわりに回転する入力軸と出力軸との間に、入力軸の回転を僅かな角度遅れをもって出力軸に伝達するトルク伝達手段を設け、回転を拘束した外輪を出力軸の径方向外側に配し、出力軸の外周面に複数のカム面を設けて、外輪の内周円筒面と出力軸の各カム面との間に周方向両側で次第に狭小となる楔形空間を形成し、これらの各楔形空間に一対のローラとそのローラを楔形空間の狭小部へ押し込むばねを組み込むとともに、各楔形空間の周方向両側（ローラを挟んでばねと周方向で対向する位置）に、入力軸と一体に回転する保持器の柱部を挿入したものである。 The lock-type reverse input prevention clutch described in Patent Document 1 transmits the rotation of the input shaft to the output shaft with a slight angular delay between the input shaft and the output shaft that rotate about the same axis. Torque transmission means is provided, the outer ring whose rotation is restricted is arranged on the radially outer side of the output shaft, a plurality of cam surfaces are provided on the outer peripheral surface of the output shaft, and the inner peripheral cylindrical surface of the outer ring and each cam surface of the output shaft A wedge-shaped space gradually narrowing on both sides in the circumferential direction is formed, and a pair of rollers and a spring for pushing the roller into the narrow part of the wedge-shaped space are incorporated in each wedge-shaped space, and both circumferential sides of each wedge-shaped space ( A column portion of a cage that rotates integrally with the input shaft is inserted at a position facing the spring in the circumferential direction across the roller.

この逆入力防止クラッチでは、各ローラがばねの弾力で楔形空間の狭小部に押し込まれているので、出力軸に逆入力トルクが加えられても、回転方向後側のローラが外輪および出力軸に係合することにより出力軸がロックされ、出力軸から入力軸へ回転伝達しない。 In this reverse input prevention clutch, each roller is pushed into the narrow part of the wedge-shaped space by the elasticity of the spring, so even if reverse input torque is applied to the output shaft, the roller on the rear side in the rotational direction is applied to the outer ring and the output shaft. Engagement locks the output shaft and prevents rotation from the output shaft to the input shaft.

一方、入力軸に入力トルクが加えられたときは、保持器の柱部が回転方向後側のローラをばねの弾力に抗して楔形空間の広大部へ押し出すことにより、そのローラと外輪および出力軸との係合が解除されて出力軸がロック状態から解放された後、トルク伝達手段によって入力軸から出力軸に回転が伝達されるようになる（このとき、回転方向前側のローラは楔形空間の広大部に相対移動するので、外輪および出力軸と係合することはない）。 On the other hand, when an input torque is applied to the input shaft, the column of the cage pushes the roller on the rear side in the rotational direction against the elastic force of the spring to the wide part of the wedge-shaped space, so that the roller, outer ring and output After the engagement with the shaft is released and the output shaft is released from the locked state, rotation is transmitted from the input shaft to the output shaft by the torque transmitting means (at this time, the roller on the front side in the rotation direction is wedge-shaped space). ) So that it does not engage with the outer ring and the output shaft.

特開２００４−１７６７７９号公報JP 2004-176679 A

ところが、上述したロック式の逆入力防止クラッチでは、入力トルクと逆入力トルクが同時に同じ方向に加えられた場合は、入力トルクにより回転方向後側のローラが保持器の柱部に押されて楔形空間の広大部へ移動したときに、ロック状態から解放された出力軸が逆入力トルクにより入力軸の回転速度を上回る回転速度で回転（空転）し、ローラが相対的に楔形空間の狭小部へ戻ると出力軸が再びロック状態となり、その直後に入力軸の回転によりロック状態が解除されるという動作を繰り返して振動が発生し、出力軸がスムーズに回転しなくなることがある。また、その振動が継続することにより、ローラを押圧しているばねが折損することもある。 However, in the above-described lock type reverse input prevention clutch, when the input torque and the reverse input torque are applied in the same direction at the same time, the roller on the rear side in the rotation direction is pushed by the pillar portion of the cage by the input torque and is wedge-shaped. When moving to the vast part of the space, the output shaft released from the locked state rotates at the rotational speed exceeding the rotational speed of the input shaft by reverse input torque (idle), and the roller relatively moves to the narrow part of the wedge-shaped space. When the output shaft returns, the output shaft is locked again, and immediately after that, the operation of releasing the locked state by the rotation of the input shaft is repeated to generate vibration, and the output shaft may not rotate smoothly. Moreover, when the vibration continues, the spring pressing the roller may be broken.

これに対し、本発明者は、上記のような構造のロック式逆入力防止クラッチに、電磁クラッチ等のアクチュエータに駆動されて一対のローラをいずれも楔形空間の広大部へ押し出し、ロック状態を解除した状態を保持するロック解除保持手段を加えることを提案している（特願２０１６−１４１２６）。このロック解除保持手段を駆動すれば、入力トルクと逆入力トルクが同時に同じ方向に加えられても出力軸の再ロック現象が生じず、出力軸をスムーズに回転させることができ、安定したクラッチ動作が得られる。 On the other hand, the present inventor unlocks the locked state by pushing the pair of rollers driven by an actuator such as an electromagnetic clutch to the wide part of the wedge-shaped space to the lock type reverse input prevention clutch having the above-described structure. It has been proposed to add an unlocking holding means for holding the state (Japanese Patent Application No. 2006-14126). If this unlocking holding means is driven, the output shaft will not re-lock even if the input torque and reverse input torque are applied in the same direction at the same time, the output shaft can be smoothly rotated, and stable clutch operation can be achieved. Is obtained.

ただし、例えば、上記のロック解除保持手段を備えた逆入力防止クラッチをモータ駆動による回転位置決め装置に組み込み、回転位置決めを行った後に消費電力の低減を図るためにモータへの通電を遮断する場合、モータの通電遮断時にロック解除保持状態のままであると、逆入力トルクによって出力側部材の回転位置が変化するおそれがあるので、モータの通電遮断に先立ってアクチュエータを停止して逆入力防止クラッチをロック状態に戻しておく必要がある。 However, for example, when a reverse input prevention clutch provided with the above-described unlocking holding means is incorporated in a rotational positioning device driven by a motor, and the electrical power to the motor is cut off in order to reduce power consumption after rotational positioning, If the motor remains disconnected when the motor is de-energized, the rotational position of the output side member may change due to reverse input torque. It is necessary to return to the locked state.

ここで、アクチュエータの停止からの経過時間が所定時間に達したときに逆入力防止クラッチがロック状態に戻ったと推定する制御方法を採ると、なんらかの異常によってロック動作が遅れたときに、逆入力防止クラッチが実際にロック状態となる前にモータへの通電が遮断され、逆入力トルクを受けた出力側部材が意図せず回転してしまうことがある。 Here, if a control method is used to estimate that the reverse input prevention clutch has returned to the locked state when the elapsed time from the stop of the actuator reaches a predetermined time, the reverse input prevention is performed when the lock operation is delayed due to some abnormality. Before the clutch is actually locked, the energization of the motor is cut off, and the output side member receiving the reverse input torque may rotate unintentionally.

そこで、本発明は、ロック解除保持手段を備えたロック式の逆入力防止クラッチの制御方法において、ロック状態とロック解除保持状態を正確に判別できるようにすることを課題とする。 Accordingly, an object of the present invention is to enable accurate determination of a locked state and an unlocked holding state in a control method of a lock type reverse input preventing clutch provided with a lock releasing holding means.

上記の課題を解決するため、本発明は、回転トルクが入力される入力軸と、前記入力軸と同軸に配され、回転トルクが出力される出力軸と、回転を拘束された状態で前記出力軸の径方向外側に配される外輪と、前記外輪と出力軸との間に設けられ、出力軸に加えられる逆入力トルクに対して出力軸と外輪とをロックするロック手段と、前記入力軸に設けられ、入力軸に加えられる入力トルクに対して前記ロック手段によるロック状態を解除するロック解除手段と、前記ロック手段によるロック状態が解除された状態のときに、前記入力軸に加えられる入力トルクを前記出力軸に伝達するトルク伝達手段と、前記ロック手段によるロック状態を解除した状態を保持するロック解除保持手段とを備えた逆入力防止クラッチの制御方法において、前記ロック手段は、前記外輪の内周に円筒面が設けられ、前記出力軸の外周に複数のカム面が設けられて、前記外輪の内周円筒面と出力軸の各カム面との間に周方向両側で次第に狭小となる楔形空間が形成されており、これらの各楔形空間に一対の係合子とその一対の係合子に挟まれて各係合子を楔形空間の狭小部へ押し込む弾性部材とが組み込まれているものであり、前記ロック解除手段は、前記入力軸に入力トルクが加えられたときに、入力軸と一体に回転して、前記一対の係合子のうちの回転方向後側の係合子を前記楔形空間の広大部へ押し出すものであり、前記ロック解除保持手段は、ロック解除部材がアクチュエータに駆動されて軸方向に移動し、前記一対の係合子をいずれも前記楔形空間の広大部へ押し出して前記出力軸と一体回転する状態で係合するものであり、前記ロック解除部材の軸方向位置を検出するセンサを設け、このセンサの検出結果に基づいて逆入力防止クラッチのロック状態とロック解除保持状態の判別を行う構成を採用した。 In order to solve the above problems, the present invention provides an input shaft to which rotational torque is input, an output shaft that is arranged coaxially with the input shaft and that outputs rotational torque, and the output in a state where rotation is constrained. An outer ring disposed radially outside the shaft, a locking means provided between the outer ring and the output shaft, for locking the output shaft and the outer ring against reverse input torque applied to the output shaft, and the input shaft An unlocking means for releasing the locked state by the locking means with respect to an input torque applied to the input shaft, and an input applied to the input shaft when the locked state by the locking means is released In a control method for a reverse input prevention clutch, comprising: torque transmission means for transmitting torque to the output shaft; and lock release holding means for holding the unlocked state by the lock means. The locking means is provided with a cylindrical surface on the inner periphery of the outer ring and a plurality of cam surfaces on the outer periphery of the output shaft, and is arranged between the inner peripheral cylindrical surface of the outer ring and each cam surface of the output shaft. Wedge-shaped spaces that are gradually narrowed on both sides in the direction are formed, and in each of these wedge-shaped spaces, there are a pair of engagement elements and an elastic member that is sandwiched between the pair of engagement elements and pushes each engagement element into the narrow portion of the wedge-shaped space. When the input torque is applied to the input shaft, the lock release means rotates integrally with the input shaft, and the engagement on the rear side in the rotation direction of the pair of engagement elements. The lock is pushed out to the wide part of the wedge-shaped space, and the unlocking holding means moves in the axial direction when the unlocking member is driven by the actuator, and both of the pair of engaging elements are the wide part of the wedge-shaped space. To the output shaft A sensor that detects the axial position of the unlocking member, and determines the locked state and the unlocked holding state of the reverse input prevention clutch based on the detection result of the sensor. It was adopted.

すなわち、ロック解除部材がアクチュエータに駆動されて軸方向に移動したことをセンサが検出した場合はロック解除保持状態と判定し、ロック解除部材が逆方向に移動したことをセンサが検出した場合はロック状態と判定することにより、逆入力防止クラッチの状態を正確に判別できるようにしたのである。 That is, when the sensor detects that the unlocking member is driven by the actuator and moves in the axial direction, it is determined to be in the unlocked holding state, and when the sensor detects that the unlocking member has moved in the reverse direction, the lock is released. By determining the state, it is possible to accurately determine the state of the reverse input preventing clutch.

上記の構成において、前記アクチュエータが、通電によって前記ロック解除部材を駆動する電磁クラッチであり、前記センサが、前記ロック解除部材が電磁クラッチに駆動されていないときの位置にあることを検出するものである場合は、前記電磁クラッチへの通電を遮断しても前記センサによるロック解除部材の位置検出が行われないときに、ロック動作異常と判断することができる。 In the above configuration, the actuator is an electromagnetic clutch that drives the unlocking member by energization, and the sensor detects that the unlocking member is in a position when it is not driven by the electromagnetic clutch. In some cases, it can be determined that the locking operation is abnormal when the position of the unlocking member is not detected by the sensor even when the energization of the electromagnetic clutch is interrupted.

また、前記アクチュエータが、通電によって前記ロック解除部材を駆動する電磁クラッチであり、前記センサが、前記ロック解除部材が電磁クラッチに駆動されて前記出力軸と係合する位置にあることを検出するものである場合は、前記電磁クラッチへ通電しても前記センサによるロック解除部材の位置検出が行われないときに、ロック解除保持動作異常と判断することができる。 Further, the actuator is an electromagnetic clutch that drives the unlocking member by energization, and the sensor detects that the unlocking member is driven by the electromagnetic clutch and is in a position to engage with the output shaft. In this case, when the position of the unlocking member is not detected by the sensor even when the electromagnetic clutch is energized, it can be determined that the unlocking holding operation is abnormal.

本発明は、上述したように、ロック解除保持手段を備えたロック式の逆入力防止クラッチの制御方法において、ロック解除保持手段はアクチュエータに駆動されたロック解除部材が軸方向に移動して逆入力防止クラッチのロック状態を解除するものとし、そのロック解除部材の軸方向位置を検出するセンサを設け、このセンサの検出結果に基づいてロック状態とロック解除保持状態の判別を行うようにしたので、逆入力防止クラッチの状態を正確に判別することができ、その状態に応じた適切な制御を行うことができる。 As described above, according to the present invention, in the control method of the lock type reverse input prevention clutch provided with the lock release holding means, the lock release holding means moves in the axial direction as the lock release member driven by the actuator moves in the reverse direction. Since the lock state of the prevention clutch is to be released, a sensor that detects the axial position of the unlock member is provided, and based on the detection result of this sensor, the lock state and the unlock release holding state are determined. The state of the reverse input preventing clutch can be accurately determined, and appropriate control according to the state can be performed.

実施形態の制御方法を適用する逆入力防止クラッチの縦断正面図Vertical front view of a reverse input prevention clutch to which the control method of the embodiment is applied 図１のII−II線に沿った断面図（ハウジングを除く）Sectional view along line II-II in Fig. 1 (excluding housing) 図１のIII−III線に沿った断面図（ハウジングを除く）Sectional view along the line III-III in Fig. 1 (excluding the housing) ａは図１の要部の横断面図、ｂはａに対応してロック解除保持動作を説明する断面図1 is a cross-sectional view of the main part of FIG. 1, and b is a cross-sectional view for explaining an unlocking holding operation corresponding to a. ａは図２の要部の拡大断面図、ｂはａに対応してロック解除保持動作を説明する断面図2 is an enlarged cross-sectional view of the main part of FIG. ａは図１のセンサ設置位置付近の拡大断面図、ｂはａに対応してロック解除保持状態の制御保持器の位置を説明する断面図1 is an enlarged cross-sectional view in the vicinity of the sensor installation position of FIG.

以下、図面に基づき本発明の実施形態を説明する。図１および図２は、実施形態の制御方法の適用対象となるロック式の逆入力防止クラッチを示す。この逆入力防止クラッチは、入力軸１と、入力軸１と同軸に配される出力軸２と、出力軸２の大径部の径方向外側に配される外輪３と、出力軸２および外輪３の径方向外側に配されるハウジング４と、出力軸２と外輪３との間にそれぞれ挿入される複数の柱部５ａ、６ａ、７ａを有する入力側保持器５、回転保持器６、制御保持器（ロック解除部材）７と、出力軸２の大径部に隣接する位置の外周に設けられる係合片８と、出力軸２と外輪３との間に組み込まれるローラ（係合子）９およびばね（弾性部材）１０と、制御保持器７を軸方向に移動させるアクチュエータとしての電磁クラッチ１１と、回転保持器６と制御保持器７との間に設けられるボールカム機構１２とで基本的に構成されている。そのハウジング４は、図示省略した外部部材に固定されて回転不能となっており、内周には後述するように制御保持器７の軸方向位置を検出するセンサ２３、２４が設けられている。また、ばね１０としては圧縮コイルばねが用いられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a lock type reverse input prevention clutch to which the control method of the embodiment is applied. The reverse input prevention clutch includes an input shaft 1, an output shaft 2 arranged coaxially with the input shaft 1, an outer ring 3 arranged on the radially outer side of the large diameter portion of the output shaft 2, and the output shaft 2 and the outer ring. 3, a housing 4 disposed on the outer side in the radial direction, and an input side cage 5, a rotary cage 6 having a plurality of pillars 5 a, 6 a, 7 a inserted between the output shaft 2 and the outer ring 3, control A cage (unlock member) 7, an engagement piece 8 provided on the outer periphery of the position adjacent to the large diameter portion of the output shaft 2, and a roller (engagement member) 9 incorporated between the output shaft 2 and the outer ring 3. And a spring (elastic member) 10, an electromagnetic clutch 11 as an actuator for moving the control holder 7 in the axial direction, and a ball cam mechanism 12 provided between the rotary holder 6 and the control holder 7. It is configured. The housing 4 is fixed to an external member (not shown) and cannot be rotated, and sensors 23 and 24 for detecting the axial position of the control holder 7 are provided on the inner periphery as will be described later. Further, a compression coil spring is used as the spring 10.

前記入力軸１は、外周に二面幅（軸心と平行でかつ互いに平行な２つの係合面）が形成された係合部１ａと、係合部１ａの端面から突出する小径円筒部１ｂを有し、図示省略したモータから回転トルクを入力されるようになっている。 The input shaft 1 includes an engaging portion 1a having a two-sided width (two engaging surfaces parallel to the shaft center and parallel to each other) on the outer periphery, and a small-diameter cylindrical portion 1b protruding from an end surface of the engaging portion 1a. The rotational torque is input from a motor (not shown).

前記出力軸２は、大径部に二面幅を有する係合穴２ａが形成され、その係合穴２ａの底面に係合穴２ａよりも小径の円形穴２ｂが形成されている。また、軸方向で大径部と反対側に位置する小径部の外周には二面幅が形成されており、この小径部に図示省略した出力側部材が取り付けられて、回転トルクを出力するようになっている。 In the output shaft 2, an engagement hole 2a having a two-sided width is formed in the large diameter portion, and a circular hole 2b having a smaller diameter than the engagement hole 2a is formed in the bottom surface of the engagement hole 2a. In addition, a two-sided width is formed on the outer periphery of the small-diameter portion located on the opposite side of the large-diameter portion in the axial direction, and an output-side member (not shown) is attached to the small-diameter portion so as to output rotational torque. It has become.

そして、入力軸１の小径円筒部１ｂが出力軸２の円形穴２ｂに摺動自在に嵌め込まれ、入力軸１の係合部１ａの先端側部分が出力軸２の係合穴２ａに回転方向の隙間をもって挿入されて、入力軸１に加えられる入力トルクを僅かな角度遅れをもって出力軸２に伝達するトルク伝達手段が構成されている。 The small-diameter cylindrical portion 1b of the input shaft 1 is slidably fitted into the circular hole 2b of the output shaft 2, and the distal end portion of the engaging portion 1a of the input shaft 1 rotates in the engaging hole 2a of the output shaft 2. Torque transmission means is configured to insert the input torque applied to the input shaft 1 to the output shaft 2 with a slight angular delay.

前記外輪３は、固定部材１３でハウジング４に固定されてハウジング４に回転を拘束されており、内周には円筒面が設けられている。そして、図２および図５（ａ）に示すように、外輪３の径方向内側に配されている出力軸２の大径部の外周に複数のカム面２ｃが設けられて、外輪３の内周円筒面と出力軸２の各カム面２ｃとの間に周方向両側で次第に狭小となる楔形空間１４が形成されている。これらの各楔形空間１４には前記ローラ９が一対ずつ組み込まれ、前記ばね１０がその一対のローラ９に挟まれるように組み込まれて各ローラ９を楔形空間１４の狭小部へ押し込んでいる。これにより、外輪３と出力軸２との間に、出力軸２に加えられる逆入力トルクに対して出力軸２と外輪３とをロックするロック手段が構成されている。 The outer ring 3 is fixed to the housing 4 by a fixing member 13 and is restrained from rotating by the housing 4, and a cylindrical surface is provided on the inner periphery. 2 and 5A, a plurality of cam surfaces 2c are provided on the outer periphery of the large-diameter portion of the output shaft 2 arranged on the radially inner side of the outer ring 3, Between the circumferential cylindrical surface and each cam surface 2c of the output shaft 2, a wedge-shaped space 14 that is gradually narrowed on both sides in the circumferential direction is formed. A pair of rollers 9 is incorporated in each wedge-shaped space 14, and the spring 10 is assembled so as to be sandwiched between the pair of rollers 9, and each roller 9 is pushed into a narrow portion of the wedge-shaped space 14. As a result, a locking means for locking the output shaft 2 and the outer ring 3 against the reverse input torque applied to the output shaft 2 is configured between the outer ring 3 and the output shaft 2.

前記入力側保持器５、回転保持器６、制御保持器７は、それぞれの円筒部５ｂ、６ｂ、７ｂの一端にフランジ部５ｃ、６ｃ、７ｃを有し、そのフランジ部５ｃ、６ｃ、７ｃの一側面に前記柱部５ａ、６ａ、７ａが設けられている。 The input side holder 5, the rotary holder 6, and the control holder 7 have flange portions 5c, 6c, and 7c at one end of the cylindrical portions 5b, 6b, and 7b, and the flange portions 5c, 6c, and 7c. The column portions 5a, 6a and 7a are provided on one side surface.

そして、入力側保持器５は、その円筒部５ｂが入力軸１の係合部１ａの軸方向中央側部分の外周に嵌め込まれて入力軸１と一体回転するようになっている。回転保持器６は、その円筒部６ｂが制御保持器７の円筒部７ｂの外周に摺動自在に嵌め込まれ、軸受１５を介してハウジング４に回転可能かつ軸方向移動不能に支持されている。制御保持器７は、その円筒部７ｂの両端の内周に環状突部が設けられ、両環状突部が出力軸２の外周に摺動自在に嵌め込まれて回転可能かつ軸方向移動可能に支持されている。 The cylindrical holder 5b of the input side retainer 5 is fitted into the outer periphery of the axially central portion of the engaging portion 1a of the input shaft 1 so as to rotate integrally with the input shaft 1. The rotating cage 6 is slidably fitted on the outer circumference of the cylindrical portion 7 b of the control cage 7, and is supported on the housing 4 via the bearing 15 so as to be rotatable and immovable in the axial direction. The control retainer 7 is provided with annular protrusions on the inner periphery of both ends of the cylindrical portion 7b, and both annular protrusions are slidably fitted on the outer periphery of the output shaft 2, and are supported rotatably and axially movable. Has been.

また、制御保持器７のフランジ部７ｃは回転保持器６のフランジ部６ｃと出力軸２大径部および外輪３との間に位置しており、制御保持器７のフランジ部７ｃにあけられた窓７ｄに回転保持器６の柱部６ａが周方向隙間をもって通されている。その回転保持器６の柱部６ａは、前記一対のローラ９の一方を挟んでばね１０と周方向で対向する位置で、出力軸２と外輪３との間に挿入されている。一方、制御保持器７の柱部７ａは、一対のローラ９の他方を挟んでばね１０と周方向で対向する位置で、出力軸２と外輪３との間に挿入されている。そして、入力側保持器５の柱部５ａが、回転保持器６の柱部６ａと制御保持器の柱部７ａの間（回転保持器６の柱部６ａまたは制御保持器の柱部７ａを挟んでローラ９と周方向で対向する位置）で、出力軸２と外輪３との間に挿入されている。 Further, the flange portion 7 c of the control cage 7 is located between the flange portion 6 c of the rotary cage 6 and the output shaft 2 large diameter portion and the outer ring 3, and is opened in the flange portion 7 c of the control cage 7. The column part 6a of the rotary cage 6 is passed through the window 7d with a circumferential clearance. The column portion 6 a of the rotary cage 6 is inserted between the output shaft 2 and the outer ring 3 at a position facing the spring 10 in the circumferential direction with one of the pair of rollers 9 interposed therebetween. On the other hand, the column portion 7 a of the control holder 7 is inserted between the output shaft 2 and the outer ring 3 at a position facing the spring 10 in the circumferential direction with the other of the pair of rollers 9 interposed therebetween. And the column part 5a of the input side cage 5 is sandwiched between the column part 6a of the rotary cage 6 and the column part 7a of the control cage (the column part 6a of the rotary cage 6 or the column part 7a of the control cage is sandwiched between them). At a position facing the roller 9 in the circumferential direction) between the output shaft 2 and the outer ring 3.

これにより、入力軸１に入力トルクが加えられたときに、入力側保持器５が入力軸１と一体に回転して、入力側保持器５の柱部５ａが回転保持器６の柱部６ａまたは制御保持器の柱部７ａを介して一対のローラ９のうちの回転方向後側のローラ９を楔形空間１４の広大部へ押し出して、前記ロック手段によるロック状態を解除するようになっている。すなわち、入力側保持器５が、入力軸１に加えられる入力トルクに対してロック状態を解除するロック解除手段となっている。 Thereby, when an input torque is applied to the input shaft 1, the input side cage 5 rotates integrally with the input shaft 1, and the column portion 5 a of the input side cage 5 becomes the column portion 6 a of the rotation cage 6. Alternatively, the roller 9 on the rear side in the rotational direction of the pair of rollers 9 is pushed out to the wide portion of the wedge-shaped space 14 via the column portion 7a of the control cage, and the locked state by the locking means is released. . That is, the input side cage 5 serves as a lock release means for releasing the lock state with respect to the input torque applied to the input shaft 1.

前記係合片８は、図３に示すように、外周から径方向外側に張り出す複数の凸部８ａを有する円板状のもので、その凸部８ａがローラ９およびばね１０と軸方向で隣接する位置で回転保持器６の柱部６ａと制御保持器７の柱部７ａとに挟まれるように、出力軸２の外周に相対回転不能に取り付けられている。 As shown in FIG. 3, the engagement piece 8 has a disk shape having a plurality of convex portions 8a projecting radially outward from the outer periphery, and the convex portions 8a are axially connected to the roller 9 and the spring 10. It is attached to the outer periphery of the output shaft 2 so as not to be relatively rotatable so as to be sandwiched between the column portion 6a of the rotary holder 6 and the column portion 7a of the control holder 7 at adjacent positions.

前記電磁クラッチ１１は、図１に示すように、電磁石１６と円筒状のアーマチュア１７とからなる。その電磁石１６は、円板部１８ａの中心孔の縁部に軸方向内側に延びる円筒部１８ｂを設けたコア１８と、コア１８の円筒部１８ｂの外周に巻き付けられる電磁コイル１９とからなり、コア１８に出力軸２を回転自在に貫通させた状態で、コア１８の円板部１８ａの外周部分をハウジング４の外輪３固定側と反対側の端部に固定されている。また、アーマチュア１７は、コア１８の円筒部１８ｂの先端と軸方向で対向し、出力軸２を回転自在に通す状態で、軸受２０を介して制御保持器７のフランジ部７ｃと反対側の端部に一体化されている。 As shown in FIG. 1, the electromagnetic clutch 11 includes an electromagnet 16 and a cylindrical armature 17. The electromagnet 16 includes a core 18 provided with a cylindrical portion 18b extending inward in the axial direction at the edge of the center hole of the disc portion 18a, and an electromagnetic coil 19 wound around the outer periphery of the cylindrical portion 18b of the core 18. The outer peripheral portion of the disk portion 18 a of the core 18 is fixed to the end portion of the housing 4 opposite to the outer ring 3 fixing side with the output shaft 2 penetrating through the output shaft 2. The armature 17 is opposed to the front end of the cylindrical portion 18b of the core 18 in the axial direction, and the end opposite to the flange portion 7c of the control cage 7 through the bearing 20 in a state where the output shaft 2 is rotatably passed. It is integrated in the part.

これにより、電磁クラッチ１１（の電磁石１６の電磁コイル１９）に通電すると、アーマチュア１７が電磁石１６のコア１８に吸引されて、制御保持器７と一体に軸方向に移動するようになっている。 Accordingly, when the electromagnetic clutch 11 (the electromagnetic coil 19 of the electromagnet 16) is energized, the armature 17 is attracted to the core 18 of the electromagnet 16 and moves in the axial direction integrally with the control holder 7.

前記ボールカム機構１２は、図４（ａ）に示すように、回転保持器６のフランジ部６ｃと制御保持器７のフランジ部７ｃの互いの対向面に、周方向中央部で深く周方向両側で次第に浅くなる一対のカム溝２１、２１を互いに対向するように複数対設け、各対のカム溝２１、２１の間にボール２２を配したもので、クラッチ組立状態では、互いに対向するカム溝２１、２１の周方向位置がわずかにずれて、回転保持器６のカム溝２１の周方向一端側部分と制御保持器７のカム溝２１の周方向他端側部分との間にボール２２が位置している。なお、各カム溝は実施形態のような円弧状溝だけでなく、Ｖ字状溝とすることもできる。 As shown in FIG. 4 (a), the ball cam mechanism 12 is deep in the center in the circumferential direction on the opposing surfaces of the flange portion 6c of the rotary cage 6 and the flange portion 7c of the control cage 7, on both sides in the circumferential direction. A plurality of pairs of cam grooves 21, 21 that gradually become shallower are provided so as to face each other, and balls 22 are arranged between each pair of cam grooves 21, 21. , 21 is slightly displaced in the circumferential direction, and the ball 22 is positioned between the circumferential one end side portion of the cam groove 21 of the rotary cage 6 and the circumferential other end portion of the cam groove 21 of the control cage 7. doing. Each cam groove can be not only an arc-shaped groove as in the embodiment but also a V-shaped groove.

そして、制御保持器７のフランジ部７ｃが軸方向で回転保持器６のフランジ部６ｃに接近すると、図４（ｂ）に示すように、両保持器６、７がそれぞれのカム溝２１、２１の周方向中央部でボール２２と接する方向へ相対回転する。この相対回転の方向は、前記一対のローラ９およびばね１０を挟んで周方向で対向する回転保持器６の柱部６ａと制御保持器７の柱部７ａとを互いに接近させる方向となっている。 When the flange portion 7c of the control cage 7 approaches the flange portion 6c of the rotary cage 6 in the axial direction, both the cages 6 and 7 are connected to the cam grooves 21 and 21 as shown in FIG. Relative to the ball 22 at the center in the circumferential direction. The direction of this relative rotation is a direction in which the column portion 6a of the rotary holder 6 and the column portion 7a of the control holder 7 that face each other across the pair of rollers 9 and the spring 10 are brought close to each other. .

したがって、電磁クラッチ１１に通電すると、制御保持器７が軸方向移動してそのフランジ部７ｃが回転保持器６のフランジ部６ｃに接近し、両保持器６、７が相対回転することにより、図５（ｂ）に示すように、両保持器６、７の柱部６ａ、７ａがばね１０の弾力に抗して一対のローラ９をいずれも楔形空間１４の広大部へ押し出し、前記ロック手段による出力軸２と外輪３のロック状態が解除される。 Therefore, when the electromagnetic clutch 11 is energized, the control cage 7 moves in the axial direction, the flange portion 7c approaches the flange portion 6c of the rotary cage 6, and the two cages 6 and 7 rotate relative to each other. As shown in FIG. 5 (b), the column portions 6a and 7a of both the retainers 6 and 7 push out the pair of rollers 9 against the elastic force of the spring 10 to the wide portion of the wedge-shaped space 14, and the locking means The locked state of the output shaft 2 and the outer ring 3 is released.

また、このとき、回転保持器６と制御保持器７は、両保持器６、７の柱部６ａ、７ａが係合片８の外周の凸部８ａを挟み付けることにより相対回転を停止し、制御保持器７の軸方向移動も停止する。そして、この状態では、出力軸２が回転しても、出力軸２に相対回転不能に取り付けられた係合片８が回転保持器６と制御保持器７のうちの一方の保持器の柱部を押し、その一方の保持器がボールカム機構１２のボール２２を介して他方の保持器を押すことにより、両保持器６、７が出力軸２と一体に回転するので、出力軸２のカム面２ｃと各保持器６、７の柱部６ａ、７ａに押されるローラ９との位置関係は変わらず、各ローラ９は楔形空間１４の広大部に位置したままとなり、ロック解除状態が保持されることになる。 Further, at this time, the rotation retainer 6 and the control retainer 7 stop the relative rotation when the pillar portions 6a and 7a of the retainers 6 and 7 sandwich the convex portion 8a on the outer periphery of the engagement piece 8, The axial movement of the control holder 7 is also stopped. In this state, even if the output shaft 2 rotates, the engagement piece 8 attached to the output shaft 2 so as not to rotate relative to the output shaft 2 is a pillar portion of one of the rotation retainer 6 and the control retainer 7. When one of the retainers pushes the other retainer via the ball 22 of the ball cam mechanism 12, the retainers 6 and 7 rotate together with the output shaft 2, so that the cam surface of the output shaft 2 The positional relationship between 2c and the rollers 9 pushed by the pillars 6a and 7a of the cages 6 and 7 does not change, and the rollers 9 remain in the wide part of the wedge-shaped space 14, and the unlocked state is held. It will be.

すなわち、上述した回転保持器６と、制御保持器７と、係合片８と、電磁クラッチ１１と、ボールカム機構１２とで、前記ロック手段によるロック状態を解除した状態を保持するロック解除保持手段が構成されている。 That is, the above-described rotation retainer 6, control retainer 7, engagement piece 8, electromagnetic clutch 11, and ball cam mechanism 12 are used to hold the unlocked holding means that holds the unlocked state by the locking means. Is configured.

なお、電磁クラッチ１１によって駆動された制御保持器７と回転保持器６が停止するときは、必ずしも両保持器６、７の柱部６ａ、７ａが係合片８の凸部８ａを挟み付けていなくてもよい（係合片８の凸部８ａとの間に若干の隙間があってもよい）。すなわち、両保持器６、７が制御保持器７の軸方向移動の規制等によって停止した状態で出力軸２が回転すると、その直後に係合片８が両保持器６、７のうちの一方の保持器の柱部と係合して、両保持器６、７が出力軸２と一体に回転し、ロック解除状態が保持されるようになっていればよい。 When the control cage 7 and the rotary cage 6 driven by the electromagnetic clutch 11 are stopped, the column portions 6a and 7a of the cages 6 and 7 do not necessarily sandwich the convex portion 8a of the engagement piece 8. It may not be present (a slight gap may be present between the protrusion 8a of the engagement piece 8). That is, when the output shaft 2 rotates in a state where both the retainers 6 and 7 are stopped due to the restriction of the axial movement of the control retainer 7 or the like, immediately after that, the engagement piece 8 becomes one of the retainers 6 and 7. It is only necessary that both the retainers 6 and 7 rotate integrally with the output shaft 2 to be engaged with the column portion of the retainer so that the unlocked state is retained.

また、上述したロック解除保持状態で電磁クラッチ１１への通電を遮断すれば、電磁石１６のコア１８がアーマチュア１７を吸引する力がなくなるので、出力軸２と外輪３の間でばね１０の弾力により各ローラ９が再び楔形空間１４の狭小部へ押し込まれ、各ローラに柱部６ａ、７ａを押された回転保持器６と制御保持器７とが、電磁クラッチ１１に通電したときと逆の方向に相対回転し、制御保持器７はそのフランジ部７ｃが回転保持器６のフランジ部６ｃから離れる方向に移動して、電磁クラッチ１１に通電する前のロック状態に戻る。 Also, if the energization of the electromagnetic clutch 11 is interrupted in the above-described unlocked holding state, the force of the core 18 of the electromagnet 16 attracting the armature 17 is eliminated, so the elasticity of the spring 10 between the output shaft 2 and the outer ring 3 is eliminated. Each roller 9 is again pushed into the narrow portion of the wedge-shaped space 14, and the rotation cage 6 and the control cage 7 whose column portions 6 a and 7 a are pushed by the rollers are opposite to the directions when the electromagnetic clutch 11 is energized. The control cage 7 moves in a direction in which its flange portion 7 c is separated from the flange portion 6 c of the rotary cage 6, and returns to the locked state before the electromagnetic clutch 11 is energized.

そして、ロック状態では、図６（ａ）に示すように、ハウジング４内周に設けられた２つのセンサ２３、２４のうちの入力側のセンサ２３が、制御保持器７の外周に設けられた２つの環状のセンサ検出部７ｅ、７ｆのうちの入力側のセンサ検出部７ｅと径方向で対向して、制御保持器７が電磁クラッチ１１に駆動されていないときの位置にあることを検出する。ロック解除保持状態では、図６（ｂ）に示すように、出力側のセンサ２４が、制御保持器７の出力側のセンサ検出部７ｆと径方向で対向して、制御保持器７が電磁クラッチ１１に駆動されて出力軸２と係合する位置にあることを検出する。また、いずれか一方のセンサが制御保持器７の位置検出を行うときは、もう一方のセンサは位置検出を行わないようになっている。なお、この実施形態では各センサ２３、２４に誘導形近接センサを用いるが、光電形等の他のタイプのセンサを用いることもできる。 In the locked state, as shown in FIG. 6A, the sensor 23 on the input side of the two sensors 23 and 24 provided on the inner periphery of the housing 4 is provided on the outer periphery of the control holder 7. One of the two annular sensor detectors 7e and 7f is opposed to the sensor detector 7e on the input side in the radial direction, and detects that the control holder 7 is in a position when it is not driven by the electromagnetic clutch 11. . In the unlocked holding state, as shown in FIG. 6B, the output side sensor 24 faces the output side sensor detecting portion 7f of the control holder 7 in the radial direction, and the control holder 7 is electromagnetic clutch. 11 is detected to be in a position to be engaged with the output shaft 2. When one of the sensors detects the position of the control holder 7, the other sensor does not detect the position. In this embodiment, an inductive proximity sensor is used for each of the sensors 23 and 24, but other types of sensors such as a photoelectric type can also be used.

次に、この逆入力防止クラッチの制御方法について説明する。まず、入力軸１に入力トルクが加えられておらず、電磁クラッチ１１が通電されていないときには、出力側部材から出力軸２に逆入力トルクが加えられても、前記ロック手段の作用により出力軸２が回転方向後側のローラ９を介して外輪３にロックされ、出力軸２から入力軸１への回転伝達は行われない。 Next, a method for controlling the reverse input prevention clutch will be described. First, when no input torque is applied to the input shaft 1 and the electromagnetic clutch 11 is not energized, even if a reverse input torque is applied to the output shaft 2 from the output side member, the output shaft is operated by the action of the locking means. 2 is locked to the outer ring 3 via a roller 9 on the rear side in the rotation direction, and rotation transmission from the output shaft 2 to the input shaft 1 is not performed.

入力軸１から出力軸２への回転伝達を行うときは、入力軸１に入力トルクを加えると同時に、電磁クラッチ１１に通電して前記ロック解除保持手段によるロック解除動作を開始し、そのロック解除動作の完了後は回転伝達終了までロック解除状態を保持する。なお、入力軸１に入力トルクを加え始めたときには、入力軸１の回転にともなって前記ロック解除手段によるロック解除動作も開始され、このロック解除手段の方が先にロック解除動作を完了して回転伝達が可能となるが、その後にロック解除保持手段のロック解除動作が完了することにより、出力側部材から出力軸２に入力トルクと同じ方向の逆入力トルクが加えられても、出力軸２が再ロックすることがなく、スムーズな回転伝達を行えるようになる。そして、回転伝達が終了したときには、入力軸１への入力トルクの供給を停止するとともに、電磁クラッチ１１への通電を遮断してロック状態に戻す。 When transmitting the rotation from the input shaft 1 to the output shaft 2, the input torque is applied to the input shaft 1 and at the same time, the electromagnetic clutch 11 is energized to start the unlocking operation by the unlocking holding means, and the unlocking is performed. After the operation is completed, the unlocked state is maintained until the rotation transmission is completed. When the input torque is started to be applied to the input shaft 1, the unlocking operation by the unlocking means is started with the rotation of the input shaft 1, and the unlocking means completes the unlocking operation first. Although rotation transmission is possible, even if reverse input torque in the same direction as the input torque is applied from the output side member to the output shaft 2 by completing the unlocking operation of the unlocking holding means thereafter, the output shaft 2 Can be transmitted smoothly without re-locking. When the rotation transmission is finished, the supply of the input torque to the input shaft 1 is stopped and the energization of the electromagnetic clutch 11 is interrupted to return to the locked state.

ここで、この逆入力防止クラッチでは、入力側センサ２３が位置検出を行い、出力側センサ２４が位置検出を行わないときは、逆入力防止クラッチがロック状態にあると判定することができ、入力側センサ２３が位置検出を行わず、出力側センサ２４が位置検出を行うときは、ロック解除保持状態にあると判定することができるので、その状態に応じた適切な制御を行うことができる。 Here, in this reverse input prevention clutch, when the input side sensor 23 detects the position and the output side sensor 24 does not detect the position, it can be determined that the reverse input prevention clutch is in the locked state. When the side sensor 23 does not perform position detection and the output side sensor 24 performs position detection, it can be determined that the unlocked holding state exists, and therefore appropriate control according to the state can be performed.

例えば、この逆入力防止クラッチを組み込んだ回転位置決め装置において、出力側部材の回転位置決めを行った後に、消費電力の低減を図るために入力トルクの供給源となるサーボモータ等のモータへの通電を遮断する場合は、電磁クラッチ１１への通電を遮断し、各センサ２３、２４の検出結果に基づいて逆入力防止クラッチがロック状態にあると判定されてから、モータの通電遮断を行うように制御することができる。この制御方法を採れば、なんらかの異常によってロック動作が遅れても、逆入力防止クラッチが実際にロック状態となる前にモータへの通電が遮断されることはないので、回転位置決め後の逆入力トルクによる出力側部材の回転を防止することができる。 For example, in a rotational positioning device incorporating this reverse input prevention clutch, after performing rotational positioning of the output side member, energization of a motor such as a servo motor serving as a source of input torque is performed in order to reduce power consumption. When shutting off, control is performed so that the energization of the electromagnetic clutch 11 is shut off, and the motor is shut off after it is determined that the reverse input prevention clutch is locked based on the detection results of the sensors 23 and 24. can do. If this control method is adopted, even if the locking operation is delayed due to any abnormality, the energization to the motor will not be cut off before the reverse input prevention clutch is actually locked. Can prevent the output side member from rotating.

また、電磁クラッチ１１への通電を遮断しても入力側のセンサ２３による制御保持器７の位置検出が行われないときは、ロック動作異常と判断し、電磁クラッチ１１へ通電しても出力側のセンサ２４による制御保持器７の位置検出が行われないときは、ロック解除保持動作異常と判断して、それぞれの動作異常の信号を出力する。このほか、両センサ２３、２４がいずれも位置検出を行う場合や、いずれも位置検出を行わない場合は、検出異常と判断して異常信号を出力する。これにより、逆入力防止クラッチの作動中に異常が生じた場合は、その信号の種類に応じて速やかに適切な処置をとることができる。 If the position of the control retainer 7 is not detected by the input side sensor 23 even after the energization of the electromagnetic clutch 11 is cut off, it is determined that the lock operation is abnormal, and the output side is not activated even if the electromagnetic clutch 11 is energized. When the position of the control holder 7 is not detected by the sensor 24, it is determined that the unlocking holding operation is abnormal, and each abnormal operation signal is output. In addition, when both of the sensors 23 and 24 perform position detection or when neither of them performs position detection, it is determined that the detection is abnormal and an abnormality signal is output. As a result, when an abnormality occurs during operation of the reverse input prevention clutch, appropriate measures can be taken promptly according to the type of the signal.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した意味ではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

例えば、逆入力防止クラッチがロック状態にあることのみが検知できればよい場合は、入力側のセンサ２３のみを設置すればよく、ロック解除保持状態にあることのみが検知できればよい場合は、出力側のセンサ２４のみを設置すればよい。 For example, if it is only necessary to detect that the reverse input prevention clutch is in the locked state, it is only necessary to install the sensor 23 on the input side, and if it is only necessary to detect that the reverse input prevention clutch is in the unlocked holding state, Only the sensor 24 may be installed.

１入力軸
２出力軸
２ｃカム面
３外輪
４ハウジング
５入力側保持器
５ａ柱部
６回転保持器
６ａ柱部
７制御保持器（ロック解除部材）
７ａ柱部
７ｅ、７ｆセンサ検出部
８係合片
９ローラ（係合子）
１０ばね（弾性部材）
１１電磁クラッチ（アクチュエータ）
１２ボールカム機構
１３固定部材
１４楔形空間
１６電磁石
１７アーマチュア
２１カム溝
２２ボール
２３、２４センサ DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 2c Cam surface 3 Outer ring 4 Housing 5 Input side holder 5a Column part 6 Rotation holder 6a Column part 7 Control cage (lock release member)
7a Pillar part 7e, 7f Sensor detection part 8 Engagement piece 9 Roller (engagement element)
10 Spring (elastic member)
11 Electromagnetic clutch (actuator)
12 Ball cam mechanism 13 Fixing member 14 Wedge-shaped space 16 Electromagnet 17 Armature 21 Cam groove 22 Balls 23 and 24 Sensor

Claims

An input shaft to which rotational torque is input, an output shaft that is coaxially arranged with the input shaft and that outputs rotational torque, and an outer ring that is disposed radially outside the output shaft in a state where rotation is constrained, Lock means provided between the outer ring and the output shaft for locking the output shaft and the outer ring against reverse input torque applied to the output shaft, and input torque provided to the input shaft and applied to the input shaft. On the other hand, unlocking means for releasing the locked state by the locking means, and torque transmitting means for transmitting input torque applied to the input shaft to the output shaft when the locked state by the locking means is released In the control method of the reverse input prevention clutch comprising the unlocking holding means for holding the unlocked state by the locking means,
The locking means is provided with a cylindrical surface on the inner periphery of the outer ring, a plurality of cam surfaces are provided on the outer periphery of the output shaft, and between the inner peripheral cylindrical surface of the outer ring and each cam surface of the output shaft. A wedge-shaped space that is gradually narrowed on both sides in the circumferential direction is formed, a pair of engagement elements in each of these wedge-shaped spaces, and an elastic member that is sandwiched between the pair of engagement elements and pushes each engagement element into the narrow portion of the wedge-shaped space; Is built-in,
The unlocking means rotates integrally with the input shaft when an input torque is applied to the input shaft, and the engagement member on the rear side in the rotation direction of the pair of engagement members To push
The unlocking holding means engages in a state in which the unlocking member is driven by the actuator and moves in the axial direction, and the pair of engaging elements are both pushed out to the wide part of the wedge-shaped space and rotate integrally with the output shaft. Is what
A control for a reverse input prevention clutch, characterized in that a sensor for detecting the axial position of the unlocking member is provided, and the locked state and the unlocked holding state of the reverse input prevention clutch are determined based on the detection result of the sensor. Method.

The actuator is an electromagnetic clutch that drives the unlocking member by energization, and the sensor detects that the unlocking member is in a position when it is not driven by the electromagnetic clutch, and the electromagnetic clutch 2. The reverse input preventing clutch control method according to claim 1, wherein when the position of the unlocking member is not detected by the sensor even if the power supply to the sensor is cut off, it is determined that the locking operation is abnormal.

The actuator is an electromagnetic clutch that drives the unlocking member by energization, and the sensor detects that the unlocking member is driven by the electromagnetic clutch and is in a position to engage with the output shaft. The control of the reverse input prevention clutch according to claim 1, wherein when the position of the unlocking member is not detected by the sensor even when the electromagnetic clutch is energized, it is determined that the unlocking holding operation is abnormal. Method.