JP5884417B2

JP5884417B2 - Electromagnetic clutch

Info

Publication number: JP5884417B2
Application number: JP2011245825A
Authority: JP
Inventors: 敦俊池川
Original assignee: Aisin Seiki Co Ltd; Aisin Corp
Current assignee: Aisin Corp
Priority date: 2011-11-09
Filing date: 2011-11-09
Publication date: 2016-03-15
Anticipated expiration: 2031-11-09
Also published as: JP2013100889A

Description

本発明は、電磁クラッチに関し、詳しくは、駆動プーリとシャフトとが同軸芯で備えられ、回転軸芯を中心とするコイル状のラップスプリングが備えられ、このラップスプリングの巻き径の変更により動力の断続を行う電磁クラッチに関する。 The present invention relates to an electromagnetic clutch, and more specifically, a drive pulley and a shaft are provided with a coaxial core, and a coiled lap spring is provided around a rotating shaft core. The present invention relates to an electromagnetic clutch that performs intermittent operation.

上記のように構成された電磁クラッチと類似するものとして特許文献１には、入力ハブと出力ハブとを回転軸芯と同軸芯で回転自在で回転軸芯に沿って隣接する位置関係で配置した構成が示されている。つまり、入力ハブの外周と出力ハブの外周とにラップスプリングを配置し、このラップスプリングの周りに制御カラーを配置し、ラップスプリングの一方の端部を入力ハブに支持し、他方の端部を制御カラーに支持した構成が示されている。 As similar to the electromagnetic clutch configured as described above, in Patent Document 1, the input hub and the output hub are arranged in a positional relationship adjacent to each other along the rotation axis so as to be rotatable around the rotation axis and the coaxial core. The configuration is shown. In other words, wrap springs are arranged on the outer periphery of the input hub and the outer periphery of the output hub, a control collar is disposed around the wrap spring, one end of the wrap spring is supported on the input hub, and the other end is supported. The configuration supported by the control collar is shown.

この特許文献１では、制御カラーに備えたアーマチュアに磁力を作用させない状態では戻しバネの付勢力によりアーマチュアが所定位置に保持されラップスプリングが入力ハブの外周と出力ハブの外周とから分離したクラッチ切り状態にある。そして、制御カラーに備えたアーマチュアに磁力を作用させることで、磁力の作用により戻しバネの付勢力に抗してアーマチュアを電磁ソレノイドの方向に引き寄せて制御カラーの回転力を出力ハブに伝える状態となる。これによりラップスプリングの巻き径を収縮させる状態に達し、入力ハブの外周と出力ハブの外周とに亘ってラップスプリングを圧着させ入力ハブの回転駆動力を出力ハブに伝えるクラッチ入り状態を作り出すように構成されている。 In Patent Document 1, in a state where no magnetic force is applied to the armature provided in the control collar, the armature is held at a predetermined position by the urging force of the return spring, and the lap spring is separated from the outer periphery of the input hub and the outer periphery of the output hub. Is in a state. Then, by applying a magnetic force to the armature provided in the control collar, the armature is attracted in the direction of the electromagnetic solenoid against the biasing force of the return spring by the action of the magnetic force, and the rotational force of the control collar is transmitted to the output hub. Become. As a result, the state in which the winding diameter of the lap spring is contracted is reached, and the wrap spring is crimped across the outer periphery of the input hub and the outer periphery of the output hub to create a clutch engagement state that transmits the rotational driving force of the input hub to the output hub. It is configured.

また、特許文献２では、駆動プーリ（文献では入力プーリ）と、シャフト（文献ではポンプ軸）と一体回転する出力ハブとの外周とに亘ってラップスプリングを配置し、このラップスプリングの一方の端部をアーマチュアに支持し、他方の端部を出力ハブに支持し、駆動プーリの内部にアーマチュアに吸引力を作用させる電磁ソレノイドを配置した構成が示されている。 In Patent Document 2, a lap spring is arranged over the outer periphery of a drive pulley (in the literature, an input pulley) and an output hub that rotates integrally with a shaft (in the literature, a pump shaft), and one end of the lap spring. A configuration is shown in which an electromagnetic solenoid that supports the armature, supports the other end on the output hub, and places an attractive force on the armature inside the drive pulley is shown.

この特許文献２では、電磁ソレノイドからアーマチュアに磁力を作用させない状態では、ラップスプリングが入力プーリと出力ハブとの外周から分離したクラッチ切り状態にあり、電磁ソレノイドからアーマチュアに磁力を作用させて吸引することで、ラップスプリングが入力プーリの外周と出力ハブの外周とに亘って密着して駆動プーリからの駆動力をシャフトに伝えるクラッチ入り状態を作り出すように構成されている。 In Patent Document 2, in a state where no magnetic force is applied from the electromagnetic solenoid to the armature, the wrap spring is in a clutch disengagement state separated from the outer periphery of the input pulley and the output hub, and the magnetic solenoid acts on the armature to attract the armature. Thus, the wrap spring is configured to be in close contact with the outer periphery of the input pulley and the outer periphery of the output hub so as to create a clutch engagement state in which the driving force from the driving pulley is transmitted to the shaft.

特開平１１‐２０１１９１号公報JP 11-201191 A 特開２００１‐３１７５６５号公報JP 2001-317565 A

特許文献１や特許文献２に記載されるように、電磁ソレノイドに対する通電により伝動状態を作り出す電磁クラッチでは、動力を伝える場合には通電を継続する必要があり、例えば、エンジンのウォータポンプのように伝動状態（クラッチ入り状態）が長時間継続する部位に用いられる場合には電力を無駄に消費する不都合に繋がる。特に、通電により伝動状態を維持する電磁クラッチでは確実な伝動を継続して行うためには、温度上昇に伴う磁束の減少にも対応できるように電磁ソレノイドの大型化を招くことになり、コスト上昇に繋がるものであった。更に、故障により通電を行えない場合にはウォータポンプとして機能しないためエンジンのオーバーヒートに繋がるものであった。 As described in Patent Document 1 and Patent Document 2, in an electromagnetic clutch that creates a transmission state by energizing an electromagnetic solenoid, it is necessary to continue energization when transmitting power, such as a water pump of an engine. When the transmission state (clutch engagement state) is used for a part that continues for a long time, it leads to a disadvantage that power is wasted. In particular, in an electromagnetic clutch that maintains its transmission state by energization, in order to continue reliable transmission, the size of the electromagnetic solenoid will be increased to cope with the decrease in magnetic flux accompanying the temperature rise, resulting in an increase in cost. It was connected to. Further, when the power supply cannot be performed due to a failure, it does not function as a water pump, leading to overheating of the engine.

また、特許文献１に記載される構成では、電磁ソレノイドとアーマチュアとの間に形成された磁気回路中の、出力ハブにつながり回転するロータと、固定された電磁コイルとの間に、エアーギャップが形成されているため、強力な電磁ソレノイドを必要とする。更に、入力ハブと出力ハブとが隣接して配置されているため、電磁ソレノイドに通電しない状態でもラップスプリングの姿勢と、ラップスプリングと出力ハブとの接触状態によっては、入力ハブと出力ハブとが連れ廻りすることも考えられる。 In the configuration described in Patent Document 1, there is an air gap between the rotor connected to the output hub and rotating in the magnetic circuit formed between the electromagnetic solenoid and the armature, and the fixed electromagnetic coil. Because it is formed, it requires a powerful electromagnetic solenoid. Furthermore, since the input hub and the output hub are arranged adjacent to each other, the input hub and the output hub may be different depending on the position of the lap spring and the contact state between the lap spring and the output hub even when the electromagnetic solenoid is not energized. It is also possible to carry around.

これと同様に、特許文献２に記載される構成でも、クラッチ入り状態でも電磁ソレノイドとアーマチュアとの間の磁気回路中には、回転する入力プーリと固定された電磁ソレノイドとの間にエアーギャップが形成されているため、強力な電磁ソレノイドを必要とする。 Similarly, in the configuration described in Patent Document 2, even in the clutch-engaged state, there is an air gap between the rotating input pulley and the fixed electromagnetic solenoid in the magnetic circuit between the electromagnetic solenoid and the armature. Because it is formed, it requires a powerful electromagnetic solenoid.

また、駆動側回転の駆動力を被駆動側回転体の断続する電磁クラッチでは、断続操作を迅速に行うことが望まれる。 Further, in an electromagnetic clutch in which the driving force of the driven side rotating member is intermittently connected, it is desired to perform the intermittent operation quickly.

本発明の目的は、電磁ソレノイドを用いてラップスプリングを圧着状態と非圧着状態とに切り換えて伝動状態と遮断状態とを迅速に作り出す電磁クラッチを合理的に構成する点にある。 An object of the present invention is to rationally configure an electromagnetic clutch that quickly creates a transmission state and a cutoff state by switching a lap spring between a crimping state and a non-crimping state using an electromagnetic solenoid.

本発明の特徴は、駆動力を受けることで回転軸芯を中心にして回転する駆動側回転体と、前記回転軸芯と同軸芯で配置される被駆動側回転体と、前記駆動側回転体に対し、自然状態で圧着状態となるよう巻き回されたラップスプリングと、前記被駆動側回転体に固定されると共に前記ラップスプリングの一端側が連結された駆動部材と、磁性体で形成され、前記被駆動側回転体に対し前記回転軸芯を中心にして相対回転可能、かつ、前記回転軸芯に沿って移動可能で、円板状を呈し、当該円板状の部材の縁部に前記ラップスプリングの他端側が連結する作動部材と、前記作動部材を吸着固定する磁力を発生させるよう静止系に設けられた電磁ソレノイドとを有し、前記電磁ソレノイドに通電して前記作動部材を吸着固定した際に、前記駆動側回転体との摩擦力あるいは動慣性によって前記駆動部材が前記作動部材と相対回転し、前記駆動側回転体に対する前記ラップスプリングの圧着状態を解消して前記駆動側回転体から前記被駆動側回転体への動力伝達を遮断するように構成し、
前記作動部材を基準にして前記電磁ソレノイドの反対側に前記被駆動側回転体と一体的に回転し前記回転軸芯に沿う方向に変位自在で磁性体で形成される中間部材を備え、
前記作動部材において前記電磁ソレノイドが吸着する面に主孔部を形成し、前記中間部材において前記作動部材からの磁束が作用する面に副孔部を形成し、この作動部材と中間部材とで拘束手段が構成され、
前記拘束手段は、前記電磁ソレノイドの駆動により前記作動部材が前記電磁ソレノイドに吸着された後に動慣性による前記駆動側回転体の回転を許し、この回転により前記駆動側回転体に対する前記ラップスプリングの圧着が解除される回転位相に達した時点で前記中間部材に作用する吸引力を増大させ、この吸引力により前記中間部材を前記作動部材に吸着して回転を阻止するように前記主孔部と副孔部との位置関係が設定されている点にある。 The present invention is characterized in that a driving side rotating body that rotates around a rotation axis by receiving a driving force, a driven side rotating body that is arranged coaxially with the rotation axis, and the driving side rotating body On the other hand, a wrap spring wound to be in a pressure-bonded state in a natural state, a driving member fixed to the driven-side rotating body and connected to one end side of the wrap spring, and a magnetic body, It is relatively rotatable with respect to the driven-side rotating body around the rotation axis, and is movable along the rotation axis. The disk-shaped member is wrapped around the edge of the disk-shaped member. an actuating member the other end of the spring is connected, and a solenoid provided in the stationary system so as to generate a magnetic force for adsorbing fixing the actuating member, has attracted fix the actuating member by supplying an electric current to the electromagnetic solenoid When the drive side The drive member rotates relative to the actuating member due to frictional force or dynamic inertia with a rolling element to cancel the pressure-bonded state of the lap spring against the drive-side rotary body, and from the drive-side rotary body to the driven-side rotary body configured to cut off power transmission to,
An intermediate member formed of a magnetic body that is integrally rotated with the driven-side rotating body on the opposite side of the electromagnetic solenoid with respect to the operating member and is displaceable in a direction along the rotation axis;
A main hole portion is formed on a surface of the actuating member on which the electromagnetic solenoid is attracted, and a sub hole portion is formed on a surface of the intermediate member on which a magnetic flux from the actuating member acts, and is restrained by the actuating member and the intermediate member. Means are configured,
The restraining means allows the driving side rotating body to rotate by dynamic inertia after the operating member is attracted to the electromagnetic solenoid by driving the electromagnetic solenoid, and the rotation of the lap spring against the driving side rotating body is caused by this rotation. The suction force acting on the intermediate member is increased at the time when the rotational phase is released, and the main hole portion and the sub-portion are prevented so that the suction force attracts the intermediate member to the operating member to prevent the rotation. The positional relationship with the hole is set .

この構成によると、電磁ソレノイドに通電しない状態では、ラップスプリングが駆動側回転体に圧着することにより、駆動側回転体の回転力がラップスプリングの一端側に連結する駆動部材から被駆動側回転体に伝える伝動状態（クラッチ入り状態）が作り出される。また、電磁ソレノイドに通電した場合には、ラップスプリングの他端側が連結する作動部材が電磁ソレノイドに吸着されるため回転が阻止され、この回転の阻止の後に動慣性により駆動部材が作動部材に対して相対回転する。この相対回転によりラップスプリングが捩られ駆動側回転体に対する圧着状態が解消されることになり、駆動プーリからシャフトへの動力伝達を遮断し遮断状態（クラッチ切り状態）に達する。
また、例えば、作動部材としてラップスプリングが連結するためのアームを外周部に形成したものと比較すると、本発明の作動部材は円板状に形成され、ラップスプリングを縁部に連結するので、回転状態の電磁ソレノイドに吸着した場合にも動慣性が小さく、迅速に回転停止を行える。次に、遮断状態から電磁ソレノイドに供給する電力を遮断した場合にラップスプリングが圧着方向に変形する際の付勢力で作動部材が回転を開始する際の慣性も小さいため迅速に回転の開始を行える。
従って、電磁ソレノイドを用いてラップスプリングを圧着状態と非圧着状態とに切り換えて伝動状態と遮断状態とを迅速に作り出す電磁クラッチが構成された。
また、作動部材が電磁ソレノイドに吸着された場合に、この作動部材の主孔部からの漏れ磁束を中間部材に作用させることが可能となる。また、中間部材には副孔部が形成されているので、この副孔部が形成された部位では磁気抵抗を増大させ吸着力が低下することになり、副孔部が形成されない部位では磁気抵抗が小さいので吸着力を増大させることが可能となる。これにより、電磁ソレノイドに通電し、この電磁ソレノイドに作動部材が吸着した後には、動慣性による駆動部材の回転の初期には作動部材から中間部材に作用する吸引力を抑制しておき、駆動プーリが遮断状態となる回転位相に達した時点で中間部材に作用する吸引力が増大させ、ラップスプリングを筒状部から離間させた状態で中間部材を作動部材に吸着して拘束し、連れ廻りを招くことのない遮断状態を作り出せる。 According to this configuration, in a state where the electromagnetic solenoid is not energized, the lap spring is pressed against the drive side rotator, so that the rotational force of the drive side rotator is connected to one end side of the lap spring from the drive member that is driven. A transmission state (clutch engaged state) is created. In addition, when the electromagnetic solenoid is energized, the operation member connected to the other end of the lap spring is attracted to the electromagnetic solenoid, so that the rotation is blocked. After the rotation is blocked, the drive member is moved against the operation member by the dynamic inertia. Relative rotation. By this relative rotation, the lap spring is twisted and the pressure-bonding state with respect to the driving-side rotating body is canceled, and the power transmission from the driving pulley to the shaft is cut off to reach a cut-off state (clutch disengaged state).
In addition, for example, compared with the case where the arm for connecting the lap spring as the operating member is formed on the outer peripheral portion, the operating member of the present invention is formed in a disc shape and connects the lap spring to the edge, so that the rotation Even when attracted to the electromagnetic solenoid in the state, the dynamic inertia is small, and the rotation can be stopped quickly. Next, when the electric power supplied to the electromagnetic solenoid is cut off from the cut-off state, the lap spring is deformed in the pressure-bonding direction so that the inertia when the actuating member starts to rotate is small, so that the rotation can be started quickly. .
Therefore, an electromagnetic clutch that quickly creates a transmission state and a cutoff state by switching the lap spring between a crimping state and a non-crimping state using an electromagnetic solenoid has been configured.
Further, when the operating member is attracted to the electromagnetic solenoid, the leakage magnetic flux from the main hole portion of the operating member can be applied to the intermediate member. Further, since the sub-hole is formed in the intermediate member, the magnetic resistance is increased at the portion where the sub-hole is formed and the attracting force is reduced, and the magnetic resistance at the portion where the sub-hole is not formed. Since it is small, it becomes possible to increase the adsorption power. Thus, after the electromagnetic solenoid is energized and the operating member is attracted to the electromagnetic solenoid, the suction force acting on the intermediate member from the operating member is suppressed at the initial stage of rotation of the driving member due to dynamic inertia, and the driving pulley The suction force acting on the intermediate member increases when the rotation phase reaches the shut-off state, and the intermediate member is attracted to the operating member and restrained while the lap spring is separated from the cylindrical portion, You can create a blocking state that does not invite you.

本発明は、前記電磁ソレノイドが前記回転軸芯を中心とするリング状の吸着面を有し、前記作動部材が前記吸着面を覆う外径に形成されても良い。 In the present invention, the electromagnetic solenoid may have a ring-shaped suction surface centered on the rotation axis, and the operating member may be formed to have an outer diameter that covers the suction surface.

これによると、電磁ソレノイドからの磁束を吸着面から作動部材に無駄なく作用させて作動部材の吸着を迅速で行わせ、遮断状態への移行を即座に行える。 According to this, the magnetic flux from the electromagnetic solenoid acts on the operating member from the suction surface without waste, so that the operating member can be quickly sucked and the transition to the shut-off state can be performed immediately.

本発明は、前記作動部材の外周に係合部が形成され、この係合部に対して前記ラップスプリングの他端側を係入させる形態で、この作動部材と前記ラップスプリングの他端側とが連結されても良い。 According to the present invention, an engaging portion is formed on the outer periphery of the operating member, and the other end side of the lap spring is engaged with the engaging portion. May be linked.

これによると、係合部にラップスプリングの他端側を係入させる形態で連結するため簡単な構成で連結状態を作り出すことが可能となる。 According to this, since it connects in the form which engages the other end side of a lap spring to an engaging part, it becomes possible to create a connection state with a simple structure.

本発明は、前記駆動側回転体の中心部に前記回転軸芯を中心とする筒状部が一体的に形成され、この筒状部の外周面に圧着する位置に前記ラップスプリングが配置されても良い。 In the present invention, a cylindrical portion centering on the rotational axis is integrally formed at the central portion of the driving side rotating body, and the lap spring is disposed at a position to be crimped to the outer peripheral surface of the cylindrical portion. Also good.

これによると、電磁ソレノイドに通電しない状態でラップスプリングが筒状部に圧着して伝動状態が作り出され、電磁ソレノイドに通電することでラップスプリングが捩り操作され筒状部の外周に対する圧着状態が解消され遮断状態に達する。また、ラップスプリングが、駆動プーリの中心側位置の筒状部の外周に圧着可能な巻き径のものを用いるので、ラップスプリングの巻き径が小さい小型のものを用いることが可能となる。特に、仕様変更によりベルト巻回部の半径が異なる駆動プーリに電磁クラッチを備える場合にも、ベルト巻回部の外径が異なる駆動プーリでも同じ外径となる筒状部を形成しておくことにより、駆動プーリを変更した場合にも電磁クラッチの構成を変更せずに済む。 According to this, the lap spring is crimped to the cylindrical part without energizing the electromagnetic solenoid to create a transmission state, and by energizing the electromagnetic solenoid, the lap spring is twisted and the crimped state against the outer periphery of the cylindrical part is eliminated. It reaches the shut-off state. Further, since the wrap spring has a winding diameter that can be crimped to the outer periphery of the cylindrical portion at the center side position of the drive pulley, it is possible to use a small wrap spring having a small winding diameter. In particular, even when a drive pulley having a different belt winding radius due to specification changes is equipped with an electromagnetic clutch, a cylindrical portion having the same outer diameter must be formed even in a drive pulley having a different belt winding outer diameter. Thus, even when the drive pulley is changed, the configuration of the electromagnetic clutch need not be changed.

本発明は、前記駆動側回転体にシリンダ状の内周面が形成され、この内周面に圧着する位置に前記ラップスプリングが配置されても良い。 In the present invention, a cylinder-shaped inner peripheral surface may be formed on the drive-side rotating body, and the lap spring may be disposed at a position where it is pressure-bonded to the inner peripheral surface.

これによると、電磁ソレノイドに通電しない状態でラップスプリングが駆動側回転体のシリンダ状内面に圧着して伝動状態が作り出され、電磁ソレノイドに通電することでラップスプリングが捩り操作され駆動側回転体のシリンダ状内面に対する圧着状態が解消され遮断状態に達する。また、ラップスプリングが、駆動側回転体において比較的広い面積として形成される内周面に圧接する構成であるので、伝動を確実に行わせることが可能となる。 According to this, the lap spring is crimped to the cylinder-shaped inner surface of the driving side rotating body without energizing the electromagnetic solenoid, and a transmission state is created, and by energizing the electromagnetic solenoid, the lap spring is twisted and operated. The crimped state on the cylinder-shaped inner surface is eliminated and the cut-off state is reached. In addition, since the lap spring is configured to be in pressure contact with an inner peripheral surface formed as a relatively large area in the driving side rotator, transmission can be reliably performed.

電磁クラッチを有するウォータポンプの断面図である。It is sectional drawing of the water pump which has an electromagnetic clutch. 電磁クラッチの構成を示す正面図である。It is a front view which shows the structure of an electromagnetic clutch. 電磁クラッチの分解斜視図である。It is a disassembled perspective view of an electromagnetic clutch. 伝動状態の電磁クラッチの正面図及び断面図である。It is the front view and sectional drawing of the electromagnetic clutch of a transmission state. 電磁ソレノイドに作動部材が吸着した状態の電磁クラッチの正面図及び断面図である。It is the front view and sectional drawing of an electromagnetic clutch of the state which the operation member adsorb | sucked to the electromagnetic solenoid. 動慣性により駆動部材が回転する状態の電磁クラッチの正面図及び断面図である。It is the front view and sectional drawing of an electromagnetic clutch in the state where a drive member rotates by dynamic inertia. 作動部材に中間部材が吸着した状態の電磁クラッチの正面図及び断面図である。It is the front view and sectional drawing of an electromagnetic clutch in the state where the intermediate member was adsorbed to the operation member. 第１別実施形態の電磁クラッチの断面図である。It is sectional drawing of the electromagnetic clutch of 1st another embodiment. 第２別実施形態の電磁クラッチの断面図である。It is sectional drawing of the electromagnetic clutch of 2nd another embodiment.

以下、本発明の実施形態を図面に基づいて説明する。
〔全体構成〕
図１〜図３には本発明の電磁クラッチＣによって動力の伝動及び遮断が可能なウォータポンプが示されている。このウォータポンプは、静止系としてのポンプハウジング１に対しシャフト軸受２により回転軸芯Ｘを中心に回転自在にシャフト３（被駆動側回転体の一例）を支持し、このシャフト３の内端にインペラ４を備え、このシャフト３とポンプハウジング１との間にシール５を備えている。ポンプハウジング１のボス状部１Ａに対しプーリ軸受６により回転軸芯Ｘを中心にして回転自在に駆動プーリ７を備えている。電磁クラッチＣは、駆動プーリ７の回転駆動力をシャフト３に伝える伝動状態（クラッチ入り状態）と、駆動プーリ７の回転駆動力を遮断する遮断状態（クラッチ切り状態）とに切換自在に構成されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
〔overall structure〕
1 to 3 show a water pump capable of transmitting and interrupting power by an electromagnetic clutch C of the present invention. This water pump supports a shaft 3 (an example of a driven rotating body) rotatably around a rotation axis X by a shaft bearing 2 with respect to a pump housing 1 serving as a stationary system, and an inner end of the shaft 3 An impeller 4 is provided, and a seal 5 is provided between the shaft 3 and the pump housing 1. A drive pulley 7 is provided so as to be rotatable about a rotation axis X by a pulley bearing 6 with respect to a boss 1A of the pump housing 1. The electromagnetic clutch C is configured to be switchable between a transmission state (clutch engaged state) that transmits the rotational driving force of the driving pulley 7 to the shaft 3 and a disconnected state (clutch disengaged state) that interrupts the rotational driving force of the driving pulley 7. ing.

駆動プーリ７は、外周側の円筒状のベルト巻回部７Ａと、このベルト巻回部７Ａで取り囲まれる空間（内周側）の中心側位置の筒状部７Ｂ（駆動側回転体の一例）と、ベルト巻回部７Ａ及び筒状部７Ｂを連結するようにポンプハウジング側に配置される側壁部７Ｃとを一体形成した構造を有している。特に、筒状部７Ｂは、回転軸芯Ｘに沿う方向での筒長Ｗｂが、ベルト巻回部７Ａの回転軸芯Ｘに沿う方向での周幅Ｗａより短く設定され、ベルト巻回部７Ａの内部空間に収容される形態となる。そして、筒状部７Ｂをプーリ軸受６に外嵌する形態で駆動プーリ７がポンプハウジング１に回転自在に支持されている。 The driving pulley 7 includes a cylindrical belt winding portion 7A on the outer peripheral side, and a cylindrical portion 7B (an example of a driving side rotating body) at a center side position of a space (inner peripheral side) surrounded by the belt winding portion 7A. And a side wall portion 7C disposed on the pump housing side so as to connect the belt winding portion 7A and the cylindrical portion 7B. In particular, the tubular portion 7B has a tube length Wb in the direction along the rotation axis X that is set shorter than the circumferential width Wa in the direction along the rotation axis X of the belt winding portion 7A, and the belt winding portion 7A. It becomes a form accommodated in the interior space. The drive pulley 7 is rotatably supported by the pump housing 1 in such a manner that the tubular portion 7B is fitted on the pulley bearing 6.

この駆動プーリ７は、平ベルトを用いる構成のものであるが、Ｖベルトを使用するため外周にＶ状の溝を形成した構成でも良く、タイミングベルトを使用するために外周面にギヤ状の凹凸を有した構成であっても良い。 The drive pulley 7 has a configuration using a flat belt. However, since a V-belt is used, the drive pulley 7 may have a configuration in which a V-shaped groove is formed on the outer periphery. It may be a configuration having

エンジン（図示せず）の出力軸に備えた出力プーリ（図示せず）と、駆動プーリ７とに亘って無端ベルトを巻回するため駆動プーリ７が常時駆動される。電磁クラッチＣは、冷却水の水温を検出する温度センサ（図示せず）の検出結果を取得する制御装置（図示せず）によって制御される。この制御装置は、エンジンの始動直後のように冷却水の水温が低い（エンジンの暖機が充分でない）ことを判別した場合には電磁クラッチＣを遮断状態に維持して暖機を促進し、エンジンの温度が適度に高まったことを判別した場合には電磁クラッチＣを伝動状態に設定してインペラ４の駆動により冷却水を循環させる制御を実行する。 Since the endless belt is wound around the output pulley (not shown) provided on the output shaft of the engine (not shown) and the drive pulley 7, the drive pulley 7 is always driven. The electromagnetic clutch C is controlled by a control device (not shown) that acquires a detection result of a temperature sensor (not shown) that detects the coolant temperature. When it is determined that the coolant temperature is low (immediately after starting the engine) (the engine is not warmed up sufficiently), the control device maintains the electromagnetic clutch C in the disengaged state and promotes warming up. When it is determined that the temperature of the engine has increased moderately, the electromagnetic clutch C is set in a transmission state, and control is performed to circulate cooling water by driving the impeller 4.

〔電磁クラッチ〕
電磁クラッチＣは、駆動プーリ７の内部に収容されるコイル状のラップスプリング１１と、駆動部材１２と、アーマチュアとして機能する作動部材１３と、中間部材１５と、作動部材１３に吸引力を作用させて吸着する電磁ソレノイドＳとを備えている。 [Electromagnetic clutch]
The electromagnetic clutch C applies a suction force to the coiled lap spring 11 housed in the drive pulley 7, the drive member 12, the actuating member 13 functioning as an armature, the intermediate member 15, and the actuating member 13. And an electromagnetic solenoid S to be attracted.

ポンプハウジング１のボス状部１Ａに対して鉄材やニッケル合金材等により環状に形成される磁性体製のヨーク１７が固設され、このヨーク１７には回転軸芯Ｘと同軸芯でインペラ４と反対側に開放する環状となる凹部が形成されている。この凹部に対しボビン１８Ａに銅線を巻回したコイル１８を挿入して電磁ソレノイドＳが構成されている。この電磁ソレノイドＳは、コイル１８が挿入される凹部の内側と外側とにおいて回転軸芯Ｘを中心とするリング状の領域の吸着面が形成される。 A magnetic yoke 17 formed in an annular shape by iron or nickel alloy material is fixed to the boss 1A of the pump housing 1, and the yoke 17 is connected to the impeller 4 coaxially with the rotary shaft X. An annular recess that opens to the opposite side is formed. An electromagnetic solenoid S is configured by inserting a coil 18 in which a copper wire is wound around a bobbin 18A into the recess. The electromagnetic solenoid S has a ring-shaped attracting surface centered on the rotation axis X at the inside and outside of the recess into which the coil 18 is inserted.

ラップスプリング１１は、バネ鋼をスパイラルに成形したコイル状の形状を有すると共に、自然状態（外力が作用しない状態）において駆動プーリ７の筒状部７Ｂの外周に圧着する巻き径のものが使用されている。この圧着状態でラップスプリング１１のコイル状部の軸芯が回転軸芯Ｘと同軸芯上に配置されることになる。また、ラップスプリング１１のうち回転軸芯Ｘに沿う方向でポンプハウジング側となる一端側１１Ａ（一方の端部）を半径方向の外方に折り曲げており、外方の他端側１１Ｂ（他方の端部）を回転軸芯Ｘに沿う姿勢で外方に向けて折り曲げている。 The wrap spring 11 has a coil shape in which spring steel is formed into a spiral shape, and has a winding diameter that is crimped to the outer periphery of the cylindrical portion 7B of the drive pulley 7 in a natural state (a state where no external force is applied). ing. In this crimped state, the axis of the coiled portion of the lap spring 11 is arranged on the axis of rotation X and on the same axis. In addition, one end side 11A (one end portion) on the pump housing side in the direction along the rotation axis X of the lap spring 11 is bent outward in the radial direction, and the other end side 11B (the other end side) The end portion is bent outward in a posture along the rotation axis X.

駆動部材１２は、シャフト３と一体回転するように回転軸芯Ｘと同軸芯で形成されたスリーブ部１２Ｓをシャフト３の前端部に嵌合連結している。この駆動部材１２の外周部位から回転軸芯Ｘを平行となる姿勢に屈曲した３つの駆動アーム１２Ａがポンプハウジング１の方向に延出する形態で形成され、３つの駆動アーム１２Ａのうちの１つに形成された係合孔部１２Ｂに対してラップスプリング１１の一端側１１Ａを挿通する形態で、この一端側１１Ａが駆動部材１２に連結している。 The drive member 12 is fitted and connected to a front end portion of the shaft 3 with a sleeve portion 12 S formed of a rotation axis X and a coaxial core so as to rotate integrally with the shaft 3. Three drive arms 12A bent in a posture in which the rotation axis X is parallel from the outer peripheral portion of the drive member 12 are formed so as to extend in the direction of the pump housing 1, and one of the three drive arms 12A. The one end side 11 A of the lap spring 11 is connected to the drive member 12 in such a manner that the one end side 11 A of the lap spring 11 is inserted into the engagement hole portion 12 B formed at the end.

作動部材１３は、回転軸芯Ｘを中心とする円板状で鉄材やニッケル合金材等を用いた磁性体で成るディスク状部１３Ａを有すると共に、このディスク状部１３Ａの外周に対して外方に突出する形態で係合凹部を有する３つの係合部１３Ｂが一体的に形成されている。また、この３つの係合部１３Ｂのうちの１つに形成された係合凹部に対してラップスプリング１１の他端側１１Ｂを挿通する形態で、この他端側１１Ｂが作動部材に係合連結している。ディスク状部１３Ａは電磁ソレノイドＳの吸着面の外周の半径と一致する半径で形成され、このディスク状部１３Ａの中心位置には貫通孔部が形成されている。 The actuating member 13 has a disk-like portion 13A made of a magnetic material using a disc material centered on the rotational axis X and made of an iron material, a nickel alloy material, etc. The three engaging portions 13B having the engaging recesses are formed integrally with each other. Further, the other end side 11B of the lap spring 11 is inserted into the engaging recess formed in one of the three engaging portions 13B, and the other end side 11B is engaged and connected to the operating member. doing. The disc-shaped portion 13A is formed with a radius that matches the radius of the outer periphery of the attracting surface of the electromagnetic solenoid S, and a through-hole portion is formed at the center position of the disc-shaped portion 13A.

この作動部材１３がシャフト３に対して相対回転自在、かつ、回転軸芯Ｘに沿う方向に移動自在となるように貫通孔部にスリーブ部１２Ｓを挿通する形態で、スリーブ部１２Ｓに遊嵌状態で支持されている。スリーブ部１２Ｓにはコイルバネ１６が外嵌され、このコイルバネ１６の付勢力によって作動部材１３が電磁ソレノイドＳのヨーク１７から離間する方向に付勢されている。 The actuating member 13 is loosely fitted to the sleeve portion 12S in such a form that the sleeve portion 12S is inserted into the through-hole portion so as to be rotatable relative to the shaft 3 and movable in the direction along the rotation axis X. It is supported by. A coil spring 16 is fitted on the sleeve portion 12 S, and the actuating member 13 is urged away from the yoke 17 of the electromagnetic solenoid S by the urging force of the coil spring 16.

中間部材１５は、回転軸芯Ｘを中心とする円板状で鉄材やニッケル合金材等を用いた磁性体で構成され、シャフト３に対して相対回転自在、かつ、回転軸芯Ｘに沿う方向に移動自在となるようにスリーブ部１２Ｓに遊嵌支持されている。この中間部材１５は、電磁ソレノイドＳの吸着面の外周の半径と一致する半径で形成され、作動部材１３と駆動部材１２とに挟み込まれる位置に配置されている。そして、駆動部材１２と一体回転するように板バネ１４を介して駆動部材１２に連結している。 The intermediate member 15 is made of a magnetic material using a disk or the like around the rotation axis X and using an iron material, nickel alloy material, or the like, and is rotatable relative to the shaft 3 and along the rotation axis X. The sleeve portion 12S is loosely supported so as to be freely movable. The intermediate member 15 is formed with a radius that matches the radius of the outer periphery of the attracting surface of the electromagnetic solenoid S, and is disposed at a position sandwiched between the operating member 13 and the driving member 12. And it connects with the drive member 12 via the leaf | plate spring 14 so that the drive member 12 may rotate integrally.

この中間部材１５は、外力が作用しない状態で板バネ１４の付勢力によって作動部材１３から接触する位置に保持され、作動部材１３から磁力の吸引力が作用する場合には３つの板バネ１４が弾性変形することにより回転軸芯Ｘに沿って作動部材１３の方向に変位可能に構成されている。 The intermediate member 15 is held at a position in contact with the operating member 13 by the urging force of the leaf spring 14 in a state where no external force is applied. When the magnetic member attracts the magnetic force from the operating member 13, the three leaf springs 14 are By being elastically deformed, it can be displaced in the direction of the actuating member 13 along the rotation axis X.

駆動部材１２の３つの駆動アーム１２Ａは、回転バランスをとるために周方向で等間隔で形成されており、この３つの駆動アーム１２Ａがラップスプリング１１の外側に配置されるため、ラップスプリング１１が筒状部７Ｂの外周から離間した場合に、ラップスプリング１１を設定姿勢に維持する規制手段Ｒが、この駆動アーム１２Ａに形成されている。つまり、駆動アーム１２Ａがラップスプリング１１の外方（回転軸芯Ｘから離間する方向）への変位を規制する第１規制部Ｒ１として構成されている。また、３つの駆動アーム１２Ａのうち延出側の端部と、中間部とにはラップスプリング１１の方向（回転軸芯に向かう方向）に突出する突出片を形成し、この一対の突出片によりラップスプリング１１の回転軸芯Ｘの方向に沿う変位を規制する第２規制部Ｒ２が構成されている。 The three drive arms 12A of the drive member 12 are formed at equal intervals in the circumferential direction in order to balance the rotation. Since the three drive arms 12A are arranged outside the lap spring 11, the lap spring 11 is The drive arm 12A is formed with a restricting means R that maintains the lap spring 11 in a set posture when it is separated from the outer periphery of the cylindrical portion 7B. That is, the drive arm 12A is configured as a first restricting portion R1 that restricts the displacement of the lap spring 11 outward (in the direction away from the rotation axis X). In addition, projecting pieces projecting in the direction of the lap spring 11 (direction toward the rotation axis) are formed on the extension side end portion and the intermediate portion of the three drive arms 12A. A second restricting portion R2 that restricts the displacement of the lap spring 11 along the direction of the rotation axis X is configured.

電磁ソレノイドＳの吸着面の最外周の外径と、前述した作動部材１３の外径と、中間部材１５の外径とが一致する寸法に設定されている。作動部材１３と中間部材１５との外径は、吸着面の外径と寸法的に一致する必要はなく、電磁ソレノイドＳの磁束が効率的に作用するサイズであれば多少大径であっても小径であっても良い。 The outer diameter of the outermost periphery of the attracting surface of the electromagnetic solenoid S, the outer diameter of the operating member 13 described above, and the outer diameter of the intermediate member 15 are set to coincide with each other. The outer diameters of the actuating member 13 and the intermediate member 15 do not need to coincide with the outer diameter of the attracting surface, and may be slightly larger as long as the magnetic flux of the electromagnetic solenoid S acts efficiently. Small diameter may be sufficient.

この電磁クラッチＣは、ラップスプリング１１の一端側１１Ａと他端側１１Ｂとが図４（ａ）に示す相対姿勢を維持することで、ラップスプリング１１を駆動プーリ７の筒状部７Ｂの外面に圧接させて伝動状態（クラッチ入り状態）となる。また、この伝動状態では、駆動部材１２の駆動アーム１２Ａと作動部材１３の係合部１３Ｂとが同図に示す相対姿勢に維持される。これとは逆に、ラップスプリング１１の一端側１１Ａと他端側１１Ｂとが図５（ａ）に示す相対姿勢から図６（ａ）に示す相対姿勢に変更することによりラップスプリング１１が巻き径を拡大する方向に捩り操作されるため、このラップスプリング１１を駆動プーリ７の筒状部７Ｂから離間させて図６（ａ）の遮断状態（クラッチ切り状態）となる。この遮断状態では、駆動部材１２の駆動アーム１２Ａと作動部材１３の係合部１３Ｂとが同図に示す相対姿勢に維持される。 In this electromagnetic clutch C, the one end side 11A and the other end side 11B of the lap spring 11 maintain the relative posture shown in FIG. 4A, so that the lap spring 11 is placed on the outer surface of the cylindrical portion 7B of the drive pulley 7. It is brought into contact with pressure to enter a transmission state (clutch engaged state). In this transmission state, the driving arm 12A of the driving member 12 and the engaging portion 13B of the operating member 13 are maintained in the relative posture shown in FIG. On the contrary, the lap spring 11 has a winding diameter when the one end side 11A and the other end side 11B of the lap spring 11 are changed from the relative posture shown in FIG. 5A to the relative posture shown in FIG. Therefore, the wrap spring 11 is separated from the tubular portion 7B of the drive pulley 7 to be in the disconnected state (clutch disengaged state) in FIG. In this blocked state, the drive arm 12A of the drive member 12 and the engaging portion 13B of the actuating member 13 are maintained in the relative posture shown in FIG.

特に、本発明の電磁クラッチＣは遮断状態においてラップスプリング１１を筒状部７Ｂの外面から完全に離間させる必要はなく（後述する拘束手段を備える必要はなく）、ラップスプリング１１から筒状部７Ｂの外面に作用する圧接力が低下することで駆動プーリ７とシャフト３との伝動を遮断するように構成されるものであっても良い。この場合、遮断状態においてラップスプリング１１は筒状部７Ｂの外面に軽く接触する状態となる。 In particular, the electromagnetic clutch C of the present invention does not need to completely separate the lap spring 11 from the outer surface of the cylindrical portion 7B in the disconnected state (there is no need to include a restraining means described later), and the cylindrical portion 7B from the lap spring 11 It may be configured such that transmission between the drive pulley 7 and the shaft 3 is cut off by reducing the pressure contact force acting on the outer surface of the shaft. In this case, the lap spring 11 is lightly in contact with the outer surface of the tubular portion 7B in the cut-off state.

この電磁クラッチＣでは、駆動部材１２と作動部材１３と電磁ソレノイドＳとで操作機構が構成され、電磁ソレノイドＳに電力を供給した場合には、拘束手段が、駆動部材１２の駆動アーム１２Ａと、作動部材１３の係合部１３Ｂとを図７（ａ）に示す相対姿勢に設定し、電磁ソレノイドＳに電力を供給し続けることで遮断状態が維持される。この拘束手段の作動形態を以下に説明する。 In the electromagnetic clutch C, an operating mechanism is configured by the driving member 12, the operating member 13, and the electromagnetic solenoid S. When electric power is supplied to the electromagnetic solenoid S, the restraining means includes a driving arm 12A of the driving member 12, By setting the engaging portion 13B of the actuating member 13 to the relative posture shown in FIG. 7A and continuing to supply power to the electromagnetic solenoid S, the shut-off state is maintained. The operation mode of this restraining means will be described below.

〔電磁クラッチ：拘束手段〕
作動部材１３と中間部材１５とによって拘束手段が構成されている。図１、図３、図４（ａ）に示すように、作動部材１３のディスク状部１３Ａには周方向に沿って複数の主孔部１３Ｈが形成され、中間部材１５には周方向に沿って複数の副孔部１５Ｈが形成されている。この主孔部１３Ｈと副孔部１５Ｈとは、電磁クラッチＣを遮断状態に操作する際に、駆動部材１２の駆動アーム１２Ａと、作動部材１３の係合部１３Ｂとが図７（ａ）に示す相対姿勢に設定するために機能する。この作動形態を以下に説明する。尚、主孔部１３Ｈと副孔部１５Ｈとを夫々３つ示しているが、これらの数は３つに限るものではなく、任意の数でも良い。 [Electromagnetic clutch: restraining means]
The actuating member 13 and the intermediate member 15 constitute a restraining means. As shown in FIGS. 1, 3, and 4A, the disk-shaped portion 13A of the actuating member 13 has a plurality of main hole portions 13H along the circumferential direction, and the intermediate member 15 has a circumferential direction. A plurality of sub-holes 15H are formed. The main hole portion 13H and the sub-hole portion 15H are arranged such that when the electromagnetic clutch C is operated in the disengaged state, the driving arm 12A of the driving member 12 and the engaging portion 13B of the operating member 13 are shown in FIG. Functions to set the relative posture shown. This mode of operation will be described below. Although three main hole portions 13H and three sub hole portions 15H are shown, the number of these is not limited to three, and an arbitrary number may be used.

電磁ソレノイドＳに電力が供給されない非駆動状態にある場合には、図４（ｂ）に示す如く、コイルバネ１６の付勢力により、電磁ソレノイドＳのヨーク１７から作動部材１３が離間する位置にあり、夫々の間に間隙が形成される。この状態では、ラップスプリング１１は、その付勢力により駆動プーリ７の筒状部７Ｂの外周面に圧接し、駆動部材１２の駆動アーム１２Ａと、作動部材１３の係合部１３Ｂとが図４（ａ）に示す相対姿勢に維持される。この結果、ラップスプリング１１に接続する駆動部材１２からシャフト３に回転駆動力が伝えられ、電磁クラッチＣは伝動状態に維持される。 When the electromagnetic solenoid S is in a non-driven state in which power is not supplied, the operating member 13 is separated from the yoke 17 of the electromagnetic solenoid S by the biasing force of the coil spring 16, as shown in FIG. A gap is formed between each. In this state, the wrap spring 11 is pressed against the outer peripheral surface of the cylindrical portion 7B of the drive pulley 7 by its urging force, and the drive arm 12A of the drive member 12 and the engaging portion 13B of the operating member 13 are shown in FIG. The relative posture shown in a) is maintained. As a result, the rotational driving force is transmitted from the driving member 12 connected to the lap spring 11 to the shaft 3, and the electromagnetic clutch C is maintained in the transmission state.

この伝動状態において、駆動アーム１２Ａと係合部１３Ｂとの相対角は伝動角θ１を維持し、同図に示す如く、回転軸芯Ｘに沿う方向視において主孔部１３Ｈの内部に副孔部１５Ｈが位置するように夫々の相対的な位置関係が設定されている。 In this transmission state, the relative angle between the drive arm 12A and the engaging portion 13B maintains the transmission angle θ1, and as shown in the figure, the auxiliary hole portion is formed inside the main hole portion 13H in the direction along the rotation axis X. Each relative positional relationship is set so that 15H is located.

次に、電磁ソレノイドＳのコイル１８に電力を供給する駆動状態に切り換えた場合には、図５（ｂ）に示すように、コイルバネ１６の付勢力に抗して電磁ソレノイドＳ（ヨーク１７の吸着面）に作動部材１３のディスク状部１３Ａが吸着され、これにより作動部材１３が拘束される。このように吸着されたタイミングでは、回転軸芯Ｘに沿う方向視で図５（ａ）に示す如く、主孔部１３Ｈの内部領域に副孔部１５Ｈが存在する。この位置関係では副孔部１５Ｈが磁気抵抗として作用するため、主孔部１３Ｈから中間部材１５に流れる磁束の磁束密度は副孔部１５Ｈにより制限される。 Next, when switching to a driving state in which electric power is supplied to the coil 18 of the electromagnetic solenoid S, the electromagnetic solenoid S (adsorption of the yoke 17) is resisted against the biasing force of the coil spring 16, as shown in FIG. The disk-like portion 13A of the operating member 13 is attracted to the surface), and the operating member 13 is thereby restrained. At the timing of the suction, the sub hole portion 15H exists in the inner region of the main hole portion 13H as shown in FIG. In this positional relationship, since the sub hole portion 15H acts as a magnetic resistance, the magnetic flux density of the magnetic flux flowing from the main hole portion 13H to the intermediate member 15 is limited by the sub hole portion 15H.

この電磁クラッチＣでは、電磁ソレノイドＳが駆動状態に切り換えられた直後において前述したように磁束密度が制限される状態では、作動部材１３から中間部材１５に作用する吸引力が、３つの板バネ１４から中間部材１５に作用する付勢力より小さい値に設定されているため、これにより中間部材１５は作動部材１３に吸着されない。 In this electromagnetic clutch C, in a state where the magnetic flux density is limited as described above immediately after the electromagnetic solenoid S is switched to the driving state, the attractive force acting on the intermediate member 15 from the operating member 13 is three leaf springs 14. Therefore, the intermediate member 15 is not attracted to the actuating member 13 because it is set to a value smaller than the biasing force acting on the intermediate member 15.

また、作動部材１３の回転が拘束された後にも駆動部材１２は動慣性により図５（ａ）において矢印で示す方向に回転を続け、この回転力によりラップスプリング１１を捩り操作して巻き径を拡大させ、図６（ａ）（ｂ）に示すようにラップスプリング１１を駆動プーリ７の筒状部７Ｂの外周面から離間させる。このように駆動部材１２が動慣性により回転し始める際には、回転軸芯Ｘに沿う方向視で主孔部１３Ｈの内部領域に副孔部１５Ｈが存在する状態が維持され、中間部材１５に作用する吸引力は増大せず、図５（ｂ）に示すように中間部材１５は作動部材１３に吸着されない。 Even after the rotation of the actuating member 13 is restricted, the driving member 12 continues to rotate in the direction indicated by the arrow in FIG. 5A due to dynamic inertia, and the wrap spring 11 is twisted by this rotational force to reduce the winding diameter. The lap spring 11 is separated from the outer peripheral surface of the cylindrical portion 7B of the drive pulley 7 as shown in FIGS. Thus, when the drive member 12 starts to rotate due to dynamic inertia, the state in which the sub hole portion 15H exists in the inner region of the main hole portion 13H as viewed in the direction along the rotation axis X is maintained, and the intermediate member 15 The acting suction force does not increase, and the intermediate member 15 is not attracted to the operating member 13 as shown in FIG.

この回転により、回転軸芯Ｘに沿う方向視で図６（ａ）、図７（ａ）に示すように、副孔部１５Ｈが主孔部１３Ｈの外部領域（孔が存在しない領域）まで移動し、駆動部材１２の駆動アーム１２Ａと作動部材１３の係合部１３Ｂとの相対角が遮断角θ２に達すると、図７（ｂ）に示すように中間部材１５が回転軸芯Ｘに沿って変位し作動部材１３に吸着される。つまり。この位置関係では、主孔部１３Ｈの外周位置から中間部材１５に亘る領域の磁気抵抗が大きく低下し、中間部材１５に流れる磁束の磁束密度が増大し中間部材１５に作用する吸引力が、３つの板バネ１４から中間部材１５を離間方向に作用する付勢力より大きくなるため中間部材１５が作動部材１３に吸着されるのである。この遮断角θ２に達する際に、作動部材１３の係合部１３Ｂに対して駆動アーム１２Ａの相対角は変化角αだけ変化する。 By this rotation, as shown in FIGS. 6 (a) and 7 (a), the auxiliary hole 15H moves to the outer area of the main hole 13H (area where no hole exists) as seen in the direction along the rotation axis X. When the relative angle between the drive arm 12A of the drive member 12 and the engaging portion 13B of the actuating member 13 reaches the cut-off angle θ2, the intermediate member 15 moves along the rotation axis X as shown in FIG. Displaced and attracted to the operating member 13. In other words. In this positional relationship, the magnetic resistance in the region extending from the outer peripheral position of the main hole portion 13H to the intermediate member 15 is greatly reduced, the magnetic flux density of the magnetic flux flowing through the intermediate member 15 is increased, and the attractive force acting on the intermediate member 15 is 3 The intermediate member 15 is attracted to the actuating member 13 because the intermediate member 15 becomes larger than the urging force acting in the separating direction from the two leaf springs 14. When the cutoff angle θ2 is reached, the relative angle of the drive arm 12A with respect to the engaging portion 13B of the actuating member 13 changes by the change angle α.

中間部材１５が作動部材１３に吸着されることにより、駆動部材１２の回転も阻止され、ラップスプリング１１の付勢力に抗して駆動部材１２の駆動アーム１２Ａと作動部材１３の係合部１３Ｂとの相対姿勢が図７（ｂ）に示す関係に維持される。これにより、ラップスプリング１１を駆動プーリ７の筒状部７Ｂの外周から離間させ、完全な遮断状態の保持を現出する。この遮断状態では駆動プーリ７の回転駆動力はインペラ４には伝えられずウォータポンプによる給水も停止する。 When the intermediate member 15 is attracted to the operating member 13, the rotation of the driving member 12 is also prevented, and the driving arm 12 A of the driving member 12 and the engaging portion 13 B of the operating member 13 against the biasing force of the lap spring 11. Are maintained in the relationship shown in FIG. As a result, the lap spring 11 is separated from the outer periphery of the cylindrical portion 7B of the drive pulley 7, and the holding of the complete cutoff state appears. In this shut-off state, the rotational driving force of the drive pulley 7 is not transmitted to the impeller 4 and water supply by the water pump is also stopped.

このように電磁ソレノイドＳを駆動することで、ラップスプリング１１を捩り操作してラップスプリング１１が筒状部７Ｂの外周から離間する状態に達した場合には、駆動アーム１２Ａで構成される第１規制部Ｒ１がラップスプリング１１の回転軸芯Ｘから離間する方向への変位、又は、接近する方向への変位を規制する。これと同時に、第２規制部Ｒ２がラップスプリング１１の回転軸芯Ｘに沿う方向への変位を規制する。この規制により、ラップスプリング１１は、筒状部７Ｂの外方側の決まった位置に拘束され筒状部７Ｂに接触して摩耗することや、駆動エネルギーを無駄に消費する不都合が解消される。 When the electromagnetic solenoid S is driven in this manner, the lap spring 11 is twisted to reach a state where the lap spring 11 is separated from the outer periphery of the cylindrical portion 7B. The restricting portion R1 restricts the displacement of the lap spring 11 in the direction away from the rotational axis X or the displacement in the approaching direction. At the same time, the second restricting portion R2 restricts the displacement of the lap spring 11 in the direction along the rotation axis X. Due to this restriction, the lap spring 11 is restrained at a fixed position on the outer side of the tubular portion 7B, and wears in contact with the tubular portion 7B, and the inconvenience of wasting drive energy is eliminated.

この後に、電磁ソレノイドＳの駆動を停止することにより、中間部材１５が板バネ１４の付勢力により作動部材１３から離間し、この作動部材１３はコイルバネ１６の付勢力によりヨーク１７の吸着面から離間する。そして、ラップスプリング１１は自由状態となるため、付勢力によって巻き径が縮小して駆動プーリ７の筒状部７Ｂの外周に圧接して伝動状態に復帰する。 After that, by stopping the driving of the electromagnetic solenoid S, the intermediate member 15 is separated from the operating member 13 by the urging force of the leaf spring 14, and the operating member 13 is separated from the attracting surface of the yoke 17 by the urging force of the coil spring 16. To do. Since the wrap spring 11 is in a free state, the winding diameter is reduced by the urging force, and is brought into pressure contact with the outer periphery of the cylindrical portion 7B of the drive pulley 7 to return to the transmission state.

〔実施の形態の作用・効果〕
このように、本発明の電磁クラッチでは、駆動プーリ７の筒状部７Ｂの外周にラップスプリング１１を圧着させて伝動を行う構成であるため、例えば、仕様変更によりベルト巻回部７Ａの半径が異なる駆動プーリ７に電磁クラッチＣを備える場合にも、駆動プーリ７夫々に同じ外径となる筒状部７Ｂを形成しておくことにより、電磁クラッチＣの構成を変更せずに済む。 [Operations and effects of the embodiment]
Thus, in the electromagnetic clutch of the present invention, the transmission is performed by pressing the lap spring 11 on the outer periphery of the cylindrical portion 7B of the drive pulley 7, so that, for example, the radius of the belt winding portion 7A is changed by changing the specification. Even when the electromagnetic clutch C is provided in different drive pulleys 7, it is not necessary to change the configuration of the electromagnetic clutch C by forming the cylindrical portion 7 B having the same outer diameter in each of the drive pulleys 7.

筒状部７Ｂが駆動プーリ７の内部空間に収容される寸法に形成されているため電磁クラッチ全体の小型化が実現する。回転軸芯Ｘと直交する方向視においてシャフト３をボス状部１Ａに支持するシャフト軸受２と、ボス状部１Ａに対して駆動プーリ７の筒状部７Ｂを支持するプーリ軸受６とが重なり合う位置に配置されているので、シャフト３の全長を短くし、この支持部位の強度も向上する。 Since the cylindrical portion 7B is formed in a size that can be accommodated in the internal space of the drive pulley 7, the entire electromagnetic clutch can be reduced in size. The position where the shaft bearing 2 that supports the shaft 3 on the boss 1A and the pulley bearing 6 that supports the cylindrical portion 7B of the drive pulley 7 overlap with the boss 1A in a direction perpendicular to the rotation axis X. Therefore, the overall length of the shaft 3 is shortened, and the strength of this support portion is also improved.

また、作動部材１３がディスク状に形成されているので、例えば、外周にアームが形成されるものと比較すると、この作動部材１３の小型化が可能になるだけではなく、動慣性を小さくして、電磁クラッチを切り操作ために電磁ソレノイドＳに電力を供給した場合には、電磁ソレノイドＳの吸着面に対して迅速に吸着され、動慣性による回転も抑制することになり、切り状態に達するまでの時間の短縮が実現する。 Further, since the actuating member 13 is formed in a disk shape, for example, the operating member 13 is not only reduced in size but also reduced in dynamic inertia as compared with an arm formed on the outer periphery. When electric power is supplied to the electromagnetic solenoid S to disengage the electromagnetic clutch, the electromagnetic solenoid S is quickly adsorbed to the adsorption surface of the electromagnetic solenoid S, and rotation due to dynamic inertia is also suppressed until the disengaged state is reached. The reduction of time is realized.

遮断状態では、拘束手段によりラップスプリング１１を筒状部７Ｂから離間する位置において設定姿勢に維持できるため、ラップスプリング１１を筒状部７Ｂから離間させるため伝動を確実に遮断できる。更に、遮断状態では、第１規制部Ｒ１と第２規制部Ｒ２とによりラップスプリング１１が姿勢を乱さず筒状部７Ｂから離間する位置に拘束されるためラップスプリング１１や筒状部７Ｂを偏摩耗させることがなく摩耗を抑制できる。また、クラッチ遮断状態でのラップスプリング１１の駆動プーリ７の筒状部７Ｂへの接触がなく、クラッチ結合時のラップスプリング１１の駆動プーリ７の筒状部７Ｂへの均一な圧着を実現可能とするため、駆動エネルギーが無駄に消費される不都合が解消される。 In the shut-off state, the wrap spring 11 can be maintained in the set posture at a position away from the tubular portion 7B by the restraining means, and therefore the transmission can be reliably cut off because the lap spring 11 is separated from the tubular portion 7B. Furthermore, in the shut-off state, the wrap spring 11 and the cylindrical portion 7B are biased by the first restricting portion R1 and the second restricting portion R2 so that the wrap spring 11 is restrained at a position away from the tubular portion 7B without disturbing the posture. Wear can be suppressed without being worn. Further, there is no contact of the lap spring 11 with the cylindrical portion 7B of the drive pulley 7 in the clutch disengaged state, and it is possible to realize uniform crimping of the lap spring 11 to the cylindrical portion 7B of the drive pulley 7 when the clutch is engaged. This eliminates the inconvenience of wasted driving energy.

〔別実施の形態〕
本発明は、上記した実施の形態以外に以下のように構成しても良い（この別実施の形態では実施形態と同じ機能を有するものには、実施形態と共通の番号、符号を付している）。また、以下の別実施形態では実施形態と同じ材質のものが使用されている。 [Another embodiment]
In addition to the above-described embodiments, the present invention may be configured as follows (in this other embodiment, the same functions and the same numbers as those of the embodiment are given to those having the same functions as those of the embodiment). ) In the following other embodiments, the same material as that of the embodiment is used.

（第１別実施形態）
図８に示すように、この第１別実施形態のウォータポンプの基本的な構成は前述した実施形態と共通しているが、ラップスプリング１１が駆動側回転体としての駆動プーリ７の内周面７Ｓに圧接することで駆動力を伝える伝動状態を作り出し、ラップスプリング１１が内周面７Ｓから離間することで駆動力を遮断する遮断状態を作り出すように電磁クラッチＣが構成された点において実施形態と異なる。 (First embodiment)
As shown in FIG. 8, the basic configuration of the water pump of the first alternative embodiment is the same as that of the above-described embodiment, but the inner peripheral surface of the drive pulley 7 in which the lap spring 11 serves as the drive side rotating body. The embodiment in that the electromagnetic clutch C is configured so as to create a transmission state in which the driving force is transmitted by being pressed against the 7S, and to create a blocking state in which the wrap spring 11 is separated from the inner peripheral surface 7S to cut off the driving force. And different.

ラップスプリング１１は、バネ鋼をスパイラルに成形したコイル状の形状を有すると共に、自然状態（外力が作用しない状態）において駆動プーリ７の内周面７Ｓに圧着する巻き径のものが使用されている。このラップスプリング１１のうちポンプハウジング側の一端側１１Ａ（一方の端部）を半径方向の内方に折り曲げ、外方の他端側１１Ｂ（他方の端部）を回転軸芯Ｘに沿う姿勢で外方に向けて折り曲げている。 The wrap spring 11 has a coil shape in which spring steel is formed into a spiral shape, and has a winding diameter that is crimped to the inner peripheral surface 7S of the drive pulley 7 in a natural state (a state where no external force acts). . One end side 11A (one end portion) of the wrap spring 11 on the pump housing side is bent inward in the radial direction, and the other end side 11B (the other end portion) on the outer side is aligned with the rotation axis X. It is bent outward.

このラップスプリング１１は、駆動部材１２の３つの駆動アーム１２Ａと駆動プーリ７の内周面７Ｓと間に配置され、３つの駆動アーム１２Ａのうちの１つに形成された係合孔部１２Ｂに対してラップスプリング１１の一端側１１Ａを挿通する形態で、この一端側１１Ａが駆動部材１２に連結している。また、作動部材１３のディスク状部１３Ａの外周に突出する形態で形成された３つの係合部１３Ｂのうちの１つの係合凹部に対してラップスプリング１１の他端側１１Ｂを挿通する形態で、この他端側１１Ｂが作動部材１３に連結している。 The wrap spring 11 is disposed between the three drive arms 12A of the drive member 12 and the inner peripheral surface 7S of the drive pulley 7, and is formed in an engagement hole 12B formed in one of the three drive arms 12A. On the other hand, the one end side 11 A of the lap spring 11 is inserted through the one end side 11 A and is connected to the drive member 12. Moreover, in the form which penetrates the other end side 11B of the lap spring 11 with respect to one engaging recessed part of the three engaging parts 13B formed in the form which protrudes on the outer periphery of the disk-shaped part 13A of the operating member 13. The other end 11 B is connected to the operating member 13.

３つの駆動アーム１２Ａがラップスプリング１１の内方（回転軸芯Ｘに接近する方向）に配置されるため、この３つの駆動アーム１２Ａがラップスプリング１１の変位を規制する第１規制部Ｒ１に兼用されている。また、３つの駆動アーム１２Ａのうち延出側の端部と、中間部とにはラップスプリング１１の方向に突出する突出片を形成し、この一対の突出片によりラップスプリング１１の回転軸芯Ｘの方向に沿う変位を規制する第２規制部Ｒ２が構成されている。 Since the three drive arms 12A are arranged inward of the lap spring 11 (in the direction approaching the rotation axis X), the three drive arms 12A are also used as the first regulating portion R1 that regulates the displacement of the lap spring 11. Has been. In addition, projecting pieces projecting in the direction of the lap spring 11 are formed at the extension side end portion and the intermediate portion of the three drive arms 12A, and the rotation axis X of the lap spring 11 is formed by the pair of projecting pieces. The 2nd control part R2 which controls the displacement along the direction of is comprised.

この第１別実施形態で、電磁ソレノイドＳが非駆動状態にある場合には、ラップスプリング１１が、その付勢力により駆動プーリ７の内周面７Ｓに圧接して電磁クラッチＣは伝動状態に維持される。この状態において電磁ソレノイドＳのコイル１８を駆動した場合には、実施形態と同様に電磁ソレノイドＳの吸着面に作動部材１３が吸着され作動部材１３の回転が阻止される。この回転阻止状態での主孔部１３Ｈと副孔部１５Ｈとの相対的な位置関係から駆動部材１２と中間部材１５とが一体的に回転する。この後に、ラップスプリング１１が駆動プーリ７の内周面７Ｓから離間する状態に達した時点での主孔部１３Ｈと副孔部１５Ｈとの相対的な位置関係において、中間部材１５が作動部材１３に吸着されることで、中間部材１５の回転も阻止され、電磁クラッチＣは、遮断状態に拘束されるのである。 In this first alternative embodiment, when the electromagnetic solenoid S is in the non-driven state, the lap spring 11 is pressed against the inner peripheral surface 7S of the drive pulley 7 by its urging force, and the electromagnetic clutch C is maintained in the transmission state. Is done. When the coil 18 of the electromagnetic solenoid S is driven in this state, the operating member 13 is attracted to the attracting surface of the electromagnetic solenoid S as in the embodiment, and the rotation of the operating member 13 is prevented. The drive member 12 and the intermediate member 15 are integrally rotated from the relative positional relationship between the main hole portion 13H and the sub hole portion 15H in this rotation prevention state. Thereafter, in the relative positional relationship between the main hole portion 13H and the sub hole portion 15H when the lap spring 11 reaches a state of being separated from the inner peripheral surface 7S of the drive pulley 7, the intermediate member 15 is actuated by the actuating member 13. Accordingly, the rotation of the intermediate member 15 is also prevented, and the electromagnetic clutch C is restrained in the disconnected state.

このように、作動部材１３がディスク状に形成されているので、例えば、外周にアームが形成されるものと比較すると、この作動部材１３の小型化が可能になるだけではなく、動慣性を小さくして、電磁クラッチを切り操作ために電磁ソレノイドＳに電力を供給した場合には、電磁ソレノイドＳの吸着面に対して迅速に吸着され、動慣性による回転も抑制することになり、切り状態に達するまでの時間の短縮が実現する。 As described above, since the operating member 13 is formed in a disk shape, for example, the operating member 13 is not only reduced in size but also has a small dynamic inertia as compared with an arm formed on the outer periphery. When electric power is supplied to the electromagnetic solenoid S in order to disengage the electromagnetic clutch, the electromagnetic solenoid S is quickly attracted to the attracting surface of the electromagnetic solenoid S, and rotation due to dynamic inertia is also suppressed. The time to reach is reduced.

（第２別実施形態）
図９に示すように、この第２別実施形態のウォータポンプでは、前述した実施形態と比較して駆動部材１２の支持形態が異なり、作動部材１３と中間部材１５との配置も異なるものであるが、第１別実施形態と同様にラップスプリング１１が駆動側回転体としての駆動プーリ７の内周面７Ｓに圧接することで駆動力を伝える伝動状態を作り出し、ラップスプリング１１が内周面７Ｓから離間することで駆動力を遮断する遮断状態を作り出すように電磁クラッチＣが構成されている。 (Second embodiment)
As shown in FIG. 9, in the water pump according to the second alternative embodiment, the support form of the drive member 12 is different from the above-described embodiment, and the arrangement of the actuating member 13 and the intermediate member 15 is also different. However, as in the first alternative embodiment, the lap spring 11 is brought into pressure contact with the inner peripheral surface 7S of the drive pulley 7 as the drive side rotating body, thereby creating a transmission state that transmits the driving force, and the lap spring 11 is in the inner peripheral surface 7S. The electromagnetic clutch C is configured so as to create an interrupted state in which the driving force is interrupted by being separated from the motor.

シャフト３の外端に駆動部材１２のボス部１２Ｇを嵌合支持し、このボス部１２Ｇに対しプーリ軸受６を介して回転軸芯Ｘを中心に回転自在に駆動プーリ７（駆動側回転部材の一例）を支持している。駆動部材１２のボス部１２Ｇには３つの駆動アーム１２Ａが形成され、夫々の駆動アーム１２Ａの先端部分が駆動プーリ７の内周面７Ｓの近傍で回転軸芯Ｘと平行する姿勢に屈曲形成されている。また、ボス部１２Ｇの外周に回転軸芯Ｘを中心に回転自在、且つ、回転軸芯Ｘに沿って移動自在にアーマチュアとしての作動部材１３を遊嵌支持している。この作動部材１３はディスク状部１３Ａを有すると共に、このディスク状部１３Ａの外周に対して外方に突出する形態で係合凹部を有する３つの係合部１３Ｂが一体的に形成されている。 A boss 12G of the drive member 12 is fitted and supported on the outer end of the shaft 3, and a drive pulley 7 (drive-side rotary member of the drive-side rotary member) is rotatable about the rotation axis X with respect to the boss 12G via a pulley bearing 6. One example). Three drive arms 12A are formed on the boss portion 12G of the drive member 12, and the tip portions of the respective drive arms 12A are bent and formed in a posture parallel to the rotational axis X near the inner peripheral surface 7S of the drive pulley 7. ing. In addition, an operating member 13 as an armature is loosely supported on the outer periphery of the boss portion 12G so as to be rotatable about the rotation axis X and movable along the rotation axis X. The actuating member 13 has a disc-shaped portion 13A, and three engaging portions 13B having engaging recesses are integrally formed so as to protrude outward with respect to the outer periphery of the disc-shaped portion 13A.

また、駆動部材１２の３つの駆動アーム１２Ａの外側で、駆動プーリ７の内周面７Ｓとの間にラップスプリング１１が配置される。そして、３つの駆動アーム１２Ａのうちの１つの駆動アーム１２Ａの係合孔部１２Ｂにラップスプリング１１の一端側１１Ａを挿通する形態で、この一端側１１Ａが駆動部材１２に連結している。また、作動部材１３の３つの係合部１３Ｂの１つにラップスプリング１１の他端側１１Ｂを挿通する形態で、この他端側１１Ｂが作動部材に係合連結している。 A lap spring 11 is disposed between the inner peripheral surface 7 S of the drive pulley 7 and outside the three drive arms 12 A of the drive member 12. The one end side 11 A is connected to the drive member 12 in such a form that the one end side 11 A of the lap spring 11 is inserted into the engagement hole 12 B of one of the three drive arms 12 A. In addition, the other end side 11B of the lap spring 11 is inserted into one of the three engaging portions 13B of the operating member 13, and the other end side 11B is engaged and connected to the operating member.

作動部材１３と対向する位置にヨーク１７に電磁ソレノイドＳが配置され、この作動部材１３と駆動部材１２との間のボス部１２Ｇの外周に、回転軸芯Ｘを中心に回転自在、且つ、回転軸芯Ｘに沿って移動自在に中間部材１５が遊嵌支持されている。中間部材１５は３つの板バネ１４により駆動部材１２に支持され、これにより駆動部材１２と中間部材１５とが一体回転し、回転軸芯Ｘに沿って移動自在となる。駆動部材１２のボス部１２Ｇの外周に形成された環状溝にバネ板材で成る付勢プレート２４が回転軸芯Ｘを中心に回転自在に支持され、この付勢プレート２４の外周部分と、作動部材１３の外周部分とが複数の作動ロッド２５により連結されている。 An electromagnetic solenoid S is disposed on the yoke 17 at a position facing the actuating member 13, and the outer periphery of the boss portion 12G between the actuating member 13 and the drive member 12 is rotatable about the rotation axis X and rotated. The intermediate member 15 is loosely supported so as to be movable along the axis X. The intermediate member 15 is supported on the drive member 12 by three leaf springs 14, whereby the drive member 12 and the intermediate member 15 rotate together and are movable along the rotation axis X. An urging plate 24 made of a spring plate material is supported in an annular groove formed on the outer periphery of the boss portion 12G of the driving member 12 so as to be rotatable around the rotation axis X, and an outer peripheral portion of the urging plate 24 and an operating member. 13 outer peripheral portions are connected by a plurality of operating rods 25.

３つの駆動アーム１２Ａがラップスプリング１１の内方（回転軸芯Ｘに接近する方向）に配置されるため、この３つの駆動アーム１２Ａがラップスプリング１１変位を規制する第１規制部Ｒ１に兼用されている。また、３つの駆動アーム１２Ａのうち突出側の端部と、中間部とにはラップスプリング１１の方向に突出する突出片を形成し、この一対の突出片によりラップスプリング１１の回転軸芯Ｘの方向に沿う変位を規制する第２規制部Ｒ２が構成されている。 Since the three drive arms 12A are disposed inward of the lap spring 11 (in the direction approaching the rotation axis X), the three drive arms 12A are also used as the first regulating portion R1 that regulates the displacement of the lap spring 11. ing. Further, projecting pieces projecting in the direction of the lap spring 11 are formed at the projecting side end portion and the intermediate portion of the three drive arms 12A, and the rotation shaft core X of the lap spring 11 is formed by the pair of projecting pieces. A second restricting portion R2 that restricts displacement along the direction is configured.

この第２実施形態で、電磁ソレノイドＳが非駆動状態にある場合には、ラップスプリング１１が、その付勢力により駆動プーリ７の内周面７Ｓに圧接して電磁クラッチＣは伝動状態に維持される。この状態において電磁ソレノイドＳのコイル１８を駆動した場合には、実施形態と同様に電磁ソレノイドＳの吸着面に作動部材１３が吸着され作動部材１３の回転が阻止される。この回転阻止状態での主孔部１３Ｈと副孔部１５Ｈとの相対的な位置関係から駆動部材１２と中間部材１５とが一体的に回転する。この後に、ラップスプリング１１が駆動プーリ７の内周面７Ｓから離間する状態に達した時点での主孔部１３Ｈと副孔部１５Ｈとの相対的な位置関係において、中間部材１５が作動部材１３に吸着されることで、中間部材１５の回転も阻止され、電磁クラッチＣは、遮断状態に拘束されるのである。 In the second embodiment, when the electromagnetic solenoid S is in the non-driven state, the lap spring 11 is pressed against the inner peripheral surface 7S of the drive pulley 7 by the biasing force, and the electromagnetic clutch C is maintained in the transmission state. The When the coil 18 of the electromagnetic solenoid S is driven in this state, the operating member 13 is attracted to the attracting surface of the electromagnetic solenoid S as in the embodiment, and the rotation of the operating member 13 is prevented. The drive member 12 and the intermediate member 15 are integrally rotated from the relative positional relationship between the main hole portion 13H and the sub hole portion 15H in this rotation prevention state. Thereafter, in the relative positional relationship between the main hole portion 13H and the sub hole portion 15H when the lap spring 11 reaches a state of being separated from the inner peripheral surface 7S of the drive pulley 7, the intermediate member 15 is actuated by the actuating member 13. Accordingly, the rotation of the intermediate member 15 is also prevented, and the electromagnetic clutch C is restrained in the disconnected state.

本発明は、ウオータポンプ以外にラジエータファンや過給器等の伝動系にも利用することができる。 The present invention can be used for a transmission system such as a radiator fan and a supercharger in addition to a water pump.

３非駆動側回転体（シャフト）
７Ｂ駆動側回転体・筒状部
７Ｂ駆動側回転体・内周面
１１ラップスプリング
１１Ａ一端側
１１Ｂ他端側
１２駆動部材
１３作動部材
１３Ｂ係合部
１３Ｈ主孔部
１５中間部材
１５Ｈ副孔部
Ｓ電磁ソレノイド
Ｘ回転軸芯 3 Non-drive side rotating body (shaft)
7B Driving side rotating body / cylindrical part 7B Driving side rotating body / inner peripheral surface 11 Lap spring 11A One end side 11B Other end side 12 Driving member 13 Actuating member 13B Engaging part 13H Main hole part 15 Intermediate member 15H Sub hole part S Electromagnetic solenoid X Rotating shaft core

Claims

A driving-side rotating body that rotates around the axis of rotation by receiving a driving force;
A driven-side rotating body that is arranged coaxially with the rotating shaft core;
A wrap spring wound around the drive-side rotating body so as to be in a pressure-bonded state in a natural state;
A driving member fixed to the driven-side rotating body and connected to one end of the lap spring;
It is formed of a magnetic body, is relatively rotatable around the rotation axis with respect to the driven side rotation body, and is movable along the rotation axis, presenting a disk shape, An actuating member to which the other end side of the wrap spring is coupled to the edge of the member;
And a solenoid provided in the stationary system so as to generate a magnetic force for adsorbing fixing the actuating member,
When the electromagnetic solenoid is energized and the operating member is attracted and fixed, the driving member rotates relative to the operating member due to frictional force or dynamic inertia with the driving-side rotating body, and the lap with respect to the driving-side rotating body The power transmission from the drive-side rotator to the driven-side rotator is interrupted to eliminate the pressure-bonded state of the spring ,
An intermediate member formed of a magnetic body that is integrally rotated with the driven-side rotating body on the opposite side of the electromagnetic solenoid with respect to the operating member and is displaceable in a direction along the rotation axis;
A main hole portion is formed on a surface of the actuating member on which the electromagnetic solenoid is attracted, and a sub hole portion is formed on a surface of the intermediate member on which a magnetic flux from the actuating member acts, and is restrained by the actuating member and the intermediate member. Means are configured,
The restraining means allows the driving side rotating body to rotate by dynamic inertia after the operating member is attracted to the electromagnetic solenoid by driving the electromagnetic solenoid, and the rotation of the lap spring against the driving side rotating body is caused by this rotation. The suction force acting on the intermediate member is increased at the time when the rotational phase is released, and the main hole portion and the sub-portion are prevented so that the suction force attracts the intermediate member to the operating member to prevent the rotation. An electromagnetic clutch with a positional relationship with the hole .

2. The electromagnetic clutch according to claim 1, wherein the electromagnetic solenoid has a ring-shaped suction surface centered on the rotation axis, and the operating member is formed to have an outer diameter that covers the suction surface.

An engaging part is formed on the outer periphery of the actuating member, and the actuating member and the other end side of the lap spring are connected to each other in such a manner that the other end side of the lap spring is engaged with the engaging part. The electromagnetic clutch according to claim 1 or 2.

The cylindrical part centering on the said rotating shaft center is integrally formed in the center part of the said drive side rotary body, The said lap spring is arrange | positioned in the position crimped | bonded to the outer peripheral surface of this cylindrical part. The electromagnetic clutch as described in any one of -3.

The electromagnetic clutch according to any one of claims 1 to 3, wherein a cylinder-shaped inner peripheral surface is formed on the drive-side rotating body, and the wrap spring is disposed at a position to be crimped to the inner peripheral surface.