JP2008101740A - Spring clutch - Google Patents

Spring clutch Download PDF

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Publication number
JP2008101740A
JP2008101740A JP2006286172A JP2006286172A JP2008101740A JP 2008101740 A JP2008101740 A JP 2008101740A JP 2006286172 A JP2006286172 A JP 2006286172A JP 2006286172 A JP2006286172 A JP 2006286172A JP 2008101740 A JP2008101740 A JP 2008101740A
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Japan
Prior art keywords
clutch
diameter
torsion coil
spring
coil spring
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Pending
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JP2006286172A
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Japanese (ja)
Inventor
Koji Akiyoshi
幸治 秋吉
Isao Mikuriya
功 御厨
Masafumi Nakakoji
雅文 中小路
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006286172A priority Critical patent/JP2008101740A/en
Publication of JP2008101740A publication Critical patent/JP2008101740A/en
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/47—Springs
    • E05Y2201/49—Wrap springs
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/205—Combinations of elements forming a unit
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/22—Combinations of elements of not identical elements of the same category, e.g. combinations of not identical springs

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  • Mechanical Operated Clutches (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring clutch of an improved durability which lessens an impact in torque transmission and inhibits loss due to breakage resulting from fatigue of a clutch spring. <P>SOLUTION: In the spring clutch, the clutch spring 8 made of a wire rod of a square section is fit between a pulley 1 and a pulley hub 3. The clutch spring 8 is formed of a large-diameter helical torsion spring 8a, an arcuately reversed connection part 8b which is inwardly bent 180&deg; at the end of the winding, a small-diameter helical torsion spring 8c which is in connection with the arcuately reversed connection part 8b. The large-diameter helical torsion spring and the small-diameter helical torsion spring are wound in the direction reverse to each other. The outside perimeter of the large-diameter helical torsion spring is elastically brought into contact with a clutch face 6 of the inside perimeter of the pulley. In the pulley hub, a clutch face 7 is formed opposite the small-diameter helical torsion spring. The unidirectional rotation of the pulley causes the large-diameter helical torsion spring to be brought into contact with the clutch face 6 to have the diameter enlarged, and rotated together with the pulley. In this case, the rotation is transmitted to the small-diameter helical torsion spring to gradually clamp the small-diameter helical torsion spring, as a result the pulley rotation is transmitted to the pulley hub. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

この発明は、入力部材と出力部材間に組込まれたクラッチばねによって入力部材の一方向の回転を出力部材に伝達すると共に、出力部材の回転速度が入力部材の回転速度を上回った場合に入力部材から出力部材への回転伝達を遮断するスプリングクラッチに関するものである。   The present invention transmits the rotation of the input member in one direction to the output member by a clutch spring incorporated between the input member and the output member, and the input member when the rotation speed of the output member exceeds the rotation speed of the input member. The present invention relates to a spring clutch that interrupts transmission of rotation from the motor to the output member.

一般に、エンジンのクランク軸の回転をベルト伝動装置によってエンジン補機の回転軸に伝えるようにした補機駆動装置においては、エンジンを急減速した場合、エンジン補機の回転軸に取付けられたプーリも同様に急減速しようとする。このとき、エンジン補機がオルタネータの場合、そのオルタネータの回転軸は慣性力が大きいため、エンジンが急減速されても回転軸は急減速されることはなく、その回転軸上に取付けられたプーリは一定の速度で回り続けようとする。   In general, in an accessory drive device that transmits the rotation of the crankshaft of the engine to the rotation shaft of the engine accessory by a belt transmission, when the engine is decelerated suddenly, a pulley attached to the rotation shaft of the engine accessory is also included. Try to slow down as well. At this time, if the engine accessory is an alternator, the rotating shaft of the alternator has a large inertial force, so even if the engine is suddenly decelerated, the rotating shaft is not suddenly decelerated, and a pulley mounted on the rotating shaft Tries to keep turning at a constant speed.

この場合、クランク軸上のプーリとオルタネータの回転軸上のプーリ間に大きな回転速度差が生じ、ベルトの張力が増大して破損し易くなる。   In this case, a large rotational speed difference is generated between the pulley on the crankshaft and the pulley on the rotating shaft of the alternator, and the belt tension increases and the belt is easily damaged.

また、クランク軸は１回転中において角速度が変化しており、その角速度変動に起因してプーリとベルトの間で滑りを生じ、その滑りによってベルトが摩耗し、耐久性が低下することになる。   Further, the crankshaft changes its angular velocity during one rotation, and slippage occurs between the pulley and the belt due to the fluctuation of the angular velocity, and the belt wears due to the slipping, and durability is lowered.

特許文献１には、そのような不都合を解消することができるようにしたクラッチプーリ装置が提案されている。   Patent Document 1 proposes a clutch pulley device that can eliminate such inconvenience.

上記特許文献１に記載されたクラッチプーリ装置においては、プーリとその内側に組込まれたプーリハブとの間に断面が角形の線材からなるクラッチばねを組込み、そのクラッチばねの外周をプーリの内周に形成された円筒形のクラッチ面に弾性接触し、クラッチばねの一端のコイルばね部端末をプーリハブに係止し、上記プーリの一方向への回転時にクラッチばねを拡径させてクラッチ面に対する係合力を強め、そのクラッチばねを介してプーリの回転をプーリハブに伝達するようにしている。   In the clutch pulley device described in Patent Document 1, a clutch spring made of a wire having a square cross section is incorporated between the pulley and the pulley hub incorporated inside the pulley, and the outer periphery of the clutch spring is set to the inner periphery of the pulley. Engagement force against the clutch surface by elastically contacting the formed cylindrical clutch surface, locking the end of the coil spring at one end of the clutch spring to the pulley hub, and expanding the diameter of the clutch spring when the pulley rotates in one direction. The rotation of the pulley is transmitted to the pulley hub through the clutch spring.

また、プーリハブの回転速度がプーリの回転速度を上回った場合に、クラッチばねを縮径させ、プーリのクラッチ面とクラッチばねの接触部で滑りを生じさせてプーリをフリー回転させるようにしている。   In addition, when the rotational speed of the pulley hub exceeds the rotational speed of the pulley, the diameter of the clutch spring is reduced, and slippage occurs at the contact portion between the clutch surface of the pulley and the clutch spring, so that the pulley is freely rotated.

特開２００３−３２２１７４号公報JP 2003-322174 A

ところで、上記特許文献１に記載されたクラッチプーリ装置においては、プーリハブの端部に形成されたうず巻き溝内にクラッチばねの一方の端末部を挿入して係止する構造であるため、組立てに非常に手間がかかり、組立て性を向上させる上において改善すべき点が残されていた。   By the way, in the clutch pulley apparatus described in the above-mentioned Patent Document 1, since one end portion of the clutch spring is inserted into and locked in the spiral groove formed at the end portion of the pulley hub, it is very difficult to assemble. In order to improve the assemblability, there are still points to be improved.

また、うず巻き溝の入口部より外側においてコイルばね部の外周とプーリの内周に形成されたクラッチ面間に隙間が形成されるため、トルク伝達時のクラッチばねの変形モードが、クラッチばねの前記うず巻き溝の入口部と対応する位置に折れ曲がり部が形成されることになり、その折れ曲がり部にトルク入力時の応力が集中することになる。このため、伝達トルクが繰り返し負荷された場合に、上記折れ曲がり部が疲労によって折損するおそれがあり、耐久性を向上させる上において改善すべき点が残されていた。   In addition, since a gap is formed between the clutch spring formed on the outer periphery of the coil spring portion and the inner periphery of the pulley outside the inlet portion of the spiral winding groove, the deformation mode of the clutch spring during torque transmission is A bent portion is formed at a position corresponding to the inlet portion of the spiral groove, and stress at the time of torque input is concentrated on the bent portion. For this reason, when the transmission torque is repeatedly applied, there is a possibility that the bent portion may be broken due to fatigue, and there is still a point to be improved in improving durability.

この発明の課題は、組立て性に優れたスプリングクラッチを提供することである。また、この発明は、トルク伝達時の衝撃を緩和することができるようにして、クラッチばねが疲労によって折損するのを防止することができるようにした耐久性に優れたスプリングクラッチを提供することである。   The subject of this invention is providing the spring clutch excellent in the assembly property. In addition, the present invention provides a spring clutch with excellent durability that can alleviate the impact during torque transmission and prevent the clutch spring from being broken by fatigue. is there.

上記の課題を解決するため、この発明においては、円筒形のクラッチ面を内周に有する入力部材と、その入力部材の内側に組込まれて相対的に回転自在に支持された出力部材と、前記入力部材と出力部材間に組込まれて外周がクラッチ面と弾性接触する円筒形のクラッチばねとから成り、前記入力部材の一方向への回転時にクラッチ面との接触によりクラッチばねを拡径させて、入力部材と出力部材の相互間で回転トルクを伝達するようにしたスプリングクラッチにおいて、前記クラッチばねが、前記クラッチ面に弾性接触する大径捩じりコイルばね部と、その大径捩じりコイルばね部の巻き終わり端に連設された連設部と、その連設部の端部に連設されて大径捩じりコイルばね部内に同軸上に配置された小径捩じりコイルばね部とからなり、前記大径捩じりコイルばね部と小径捩じりコイルばね部の巻き方向を逆巻きとし、前記出力部材の外周には前記小径捩じりコイルばね部と対向する部位の外周に、その小径捩じりコイルばね部により締付けられる円筒形のトルク出力用クラッチ面を形成した構成を採用したのである。   In order to solve the above problems, in the present invention, an input member having a cylindrical clutch surface on the inner periphery, an output member incorporated inside the input member and supported relatively rotatably, A cylindrical clutch spring that is incorporated between the input member and the output member and whose outer periphery is in elastic contact with the clutch surface. When the input member rotates in one direction, the clutch spring is expanded in diameter by contact with the clutch surface. In the spring clutch configured to transmit rotational torque between the input member and the output member, the clutch spring has a large-diameter torsion coil spring portion that elastically contacts the clutch surface, and the large-diameter torsion A continuous portion provided continuously at the winding end of the coil spring portion, and a small-diameter torsion coil spring provided coaxially within the large-diameter torsion coil spring portion and provided at the end of the continuous portion. Consists of parts The winding direction of the large-diameter torsion coil spring portion and the small-diameter torsion coil spring portion is reversed, and the outer circumference of the output member is arranged on the outer circumference of a portion facing the small-diameter torsion coil spring portion. A configuration in which a cylindrical torque output clutch surface that is tightened by a torsion coil spring portion is formed is employed.

上記の構成からなるスプリングクラッチにおいて、入力部材が一方向に回転し、その入力部材の内周に形成されたクラッチ面との接触により大径捩じりコイルばね部が拡径してクラッチ面を締付けると、入力部材と共に大径捩じりコイルばね部が回転し、その回転は連設部を介して小径捩じりコイルばね部に伝達され、上記小径捩じりコイルばね部が同方向に回転する。   In the spring clutch having the above-described configuration, the input member rotates in one direction, and the large-diameter torsion coil spring portion expands by contact with the clutch surface formed on the inner periphery of the input member, so that the clutch surface is When tightened, the large-diameter torsion coil spring portion rotates together with the input member, and the rotation is transmitted to the small-diameter torsion coil spring portion via the connecting portion, and the small-diameter torsion coil spring portion is in the same direction. Rotate.

このとき、小径捩じりコイルばね部は大径捩じりコイルばね部に対して巻き方向が逆向きであるため、負荷される回転力により小径捩じりコイルばね部が縮径し始め、伝達するトルクの大きさに応じてトルク出力用クラッチ面を締付け、出力部材にトルクを伝達する。   At this time, since the winding direction of the small-diameter torsion coil spring portion is opposite to that of the large-diameter torsion coil spring portion, the small-diameter torsion coil spring portion starts to shrink due to the applied rotational force, The torque output clutch surface is tightened according to the magnitude of the torque to be transmitted, and the torque is transmitted to the output member.

入力部材から出力部材への回転トルクの伝達状態において、出力部材の回転速度が入力部材の回転速度を上回ると、小径捩じりコイルばね部は拡径すると共に、大径捩じりコイルばね部は縮径し、入力部材から出力部材への回転伝達が遮断される。   When the rotational speed of the output member exceeds the rotational speed of the input member when the rotational torque is transmitted from the input member to the output member, the small-diameter torsion coil spring portion expands and the large-diameter torsion coil spring portion Is reduced in diameter and transmission of rotation from the input member to the output member is interrupted.

この発明に係るスプリングクラッチにおいて、小径捩じりコイルばね部の内径面を、連設部側の巻き始め端から巻き終り端に向けて小径となるテーパ面とし、そのテーパ面の大径端部の内径をトルク出力用クラッチ面の外径より大径とし、テーパ面の小径端部の内径をトルク出力用クラッチ面の外径より小径とすることにより、トルク伝達時に、小径捩じりコイルばね部は巻き終り端から順次縮径してトルク出力用クラッチ面を締め付けることになるため、トルク伝達時の衝撃を小径捩じりコイルばね部の縮径方向への弾性変形によって吸収することができる。   In the spring clutch according to the present invention, the inner diameter surface of the small-diameter torsion coil spring portion is a tapered surface having a small diameter from the winding start end on the connecting portion side toward the winding end end, and the large-diameter end portion of the tapered surface The inner diameter of the torque output clutch surface is larger than the outer diameter of the torque output clutch surface, and the inner diameter of the small diameter end of the tapered surface is smaller than the outer diameter of the torque output clutch surface. Since the diameter of the portion is reduced gradually from the end of winding and the torque output clutch surface is tightened, the impact at the time of torque transmission can be absorbed by the elastic deformation of the small diameter torsion coil spring portion in the diameter reduction direction. .

また、大径捩じりコイルばね部の巻き終わり端を内向きに略１８０°折り曲げて円弧状の反転連設部を設け、その反転連設部の端部に小径捩じりコイルばね部を連設することにより、トルク伝達時に反転連設部の一部に応力が集中するのを防止することができ、クラッチばねの破損をより効果的に防止することができる。   Further, the winding end of the large-diameter torsion coil spring portion is bent inward by approximately 180 ° to provide an arc-shaped inversion connecting portion, and a small-diameter torsion coil spring portion is provided at the end of the inversion connecting portion. By providing them continuously, it is possible to prevent stress from concentrating on a part of the reverse connecting part during torque transmission, and it is possible to more effectively prevent damage to the clutch spring.

さらに、クラッチばねの軸方向一側に、そのクラッチばねの連設部側端部を受ける保持リングを軸方向に非可動に、かつ、回転自在に設けることにより、入力部材と出力部材の相互間におけるトルク伝達時に大径捩じりコイルばね部および小径捩じりコイルばね部が軸方向に倒れ、あるいは、よれるのを防止することができ、伝達トルクの安定化を図ることができる。   Furthermore, a holding ring that receives the end of the clutch spring on the side of the connecting portion on the axial direction side of the clutch spring is provided so as to be non-movable and rotatable in the axial direction. It is possible to prevent the large-diameter torsion coil spring portion and the small-diameter torsion coil spring portion from being tilted or swung in the axial direction during torque transmission, and the transmission torque can be stabilized.

上記のように、この発明においては、入力部材と出力部材の相互間におけるトルクの伝達が大径捩じりコイルばね部の拡径と小径捩じりコイルばね部の縮径によるものであるため、スプリングクラッチの組立て時、クラッチばねは入力部材のクラッチ面と出力部材のクラッチ面間に組込むだけでよく、組立ての容易なスプリングクラッチを得ることができる。   As described above, in the present invention, torque transmission between the input member and the output member is due to the expansion of the large-diameter torsion coil spring portion and the reduction of the small-diameter torsion coil spring portion. When the spring clutch is assembled, the clutch spring only needs to be assembled between the clutch surface of the input member and the clutch surface of the output member, and an easily assembled spring clutch can be obtained.

また、クラッチばねの小径捩じりコイルばね部の内径面をテーパとし、その小径捩じりコイルばね部の小径端部を出力部材のトルク出力用クラッチ面に弾性接触させることにより、トルク伝達時、小径捩じりコイルばね部は出力部材のクラッチ面をトルクの大きさに応じて徐々に締付けるため、トルク伝達時の衝撃や衝撃トルクは上記小径捩じりコイルばね部の縮径方向への弾性変形によって緩和することができ、クラッチばねの破損を効果的に防止し、耐久性に優れたスプリングクラッチを得ることができる。   In addition, the inner diameter surface of the small-diameter torsion coil spring portion of the clutch spring is tapered, and the small-diameter end of the small-diameter torsion coil spring portion is elastically brought into contact with the torque output clutch surface of the output member. The small-diameter torsion coil spring portion gradually tightens the clutch surface of the output member according to the magnitude of the torque, so that the impact and impact torque during torque transmission are reduced in the direction of the diameter reduction of the small-diameter torsion coil spring portion. A spring clutch that can be relaxed by elastic deformation, effectively preventing breakage of the clutch spring, and having excellent durability can be obtained.

以下、この発明の実施の形態を図面に基づいて説明する。図示のように、入力部材としてのプーリ１は円筒状をなし、その一端部の開口は、蓋体２の取付けによって密封されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As illustrated, a pulley 1 as an input member has a cylindrical shape, and an opening at one end thereof is sealed by attaching a lid 2.

プーリ１の内側には、プーリハブ３が組込まれている。プーリハブ３は、大径軸部３ａの蓋体２側の一端部にフランジ３ｂを設け、かつ、大径軸部３ａの他端に小径軸部３ｃを設けた構成とされ、上記フランジ３ｂはすべり軸受４を介してプーリ１に相対的に回転自在に支持されている。   A pulley hub 3 is incorporated inside the pulley 1. The pulley hub 3 is configured such that a flange 3b is provided at one end of the large-diameter shaft portion 3a on the lid 2 side, and a small-diameter shaft portion 3c is provided at the other end of the large-diameter shaft portion 3a. It is rotatably supported by the pulley 1 via a bearing 4.

また、プーリハブ３の小径軸部３ｃはプーリ１の他端部内に組込まれた軸受５によって回転自在に支持されている。   Further, the small-diameter shaft portion 3 c of the pulley hub 3 is rotatably supported by a bearing 5 incorporated in the other end portion of the pulley 1.

プーリ１の内周には円筒形の入力側クラッチ面６が形成され、一方、プーリハブ３の大径軸部３ａの外周には円筒形の出力側クラッチ面７が設けられ、その両クラッチ面６、７間に断面が角形の線材から成るクラッチばね８が組込まれている。なお、クラッチばね８は断面が円形の線材からなるものであってもよい。   A cylindrical input-side clutch surface 6 is formed on the inner periphery of the pulley 1, while a cylindrical output-side clutch surface 7 is provided on the outer periphery of the large-diameter shaft portion 3 a of the pulley hub 3. , 7 is incorporated with a clutch spring 8 made of a wire having a square cross section. The clutch spring 8 may be made of a wire having a circular cross section.

クラッチばね８は、大径捩じりコイルばね部８ａと、その大径捩じりコイルばね部８ａの巻き終り側端部に形成された連設部８ｂと、その連設部８ｂの端部に連設された小径捩じりコイルばね部８ｃとからなり、上記大径捩じりコイルばね部８ａは自然状態での外径がプーリ１のクラッチ面６の内径より大きく、縮径された状態での組込みによって、その外径面が上記クラッチ面６の内径面に弾性接触している。   The clutch spring 8 includes a large-diameter torsion coil spring portion 8a, a continuous portion 8b formed at a winding end side end portion of the large-diameter torsion coil spring portion 8a, and an end portion of the continuous portion 8b. The large-diameter torsion coil spring portion 8a is continuously reduced in diameter, and the large-diameter torsion coil spring portion 8a has a natural outer diameter larger than the inner diameter of the clutch surface 6 of the pulley 1 and is reduced in diameter. Due to the incorporation in the state, the outer diameter surface is in elastic contact with the inner diameter surface of the clutch surface 6.

連設部８ｂは、大径捩じりコイルばね部８ａの巻き終り端を内向きに略１８０°折曲げることにより形成されて円弧状をなし、その反転連設部８ｂの端部に連設された小径捩じりコイルばね部８ｃは大径捩じりコイルばね部８ａの内部に配置されて大径捩じりコイルばね部８ａと同軸上に配置されている。   The continuous portion 8b is formed by bending the winding end of the large-diameter torsion coil spring portion 8a inward by approximately 180 ° to form an arc shape, and is continuously provided at the end of the reverse continuous portion 8b. The small-diameter torsion coil spring portion 8c is disposed inside the large-diameter torsion coil spring portion 8a and coaxially with the large-diameter torsion coil spring portion 8a.

小径捩じりコイルばね部８ｃの巻き方向は大径捩じりコイルばね部８ａの巻き方向に対して逆巻きとされている。実施の形態では、大径捩じりコイルばね部８ａを右巻きとし、小径捩じりコイルばね部８ｃを左巻きとしている。この小径捩じりコイルばね部８ｃの内径は、連設部８ｂ側が大径軸部３ａのクラッチ面７の外径よりやや大径とされ、上記クラッチ面７との間に微小な間隙が形成されている。また、他端（巻き終り端）側は自然状態での内径が大径軸部３ａのクラッチ面７の外径より小さく形成し、小径捩じりコイルばね部８ｃの内径はテーパ状をなしている。したがって、拡径された状態での組込みにより、小径捩じりコイルばね部８ｃの一部の内径面が上記クラッチ面７の外径面に弾性接触している。   The winding direction of the small diameter torsion coil spring portion 8c is reverse to the winding direction of the large diameter torsion coil spring portion 8a. In the embodiment, the large-diameter torsion coil spring portion 8a is clockwise and the small-diameter torsion coil spring portion 8c is counterclockwise. The inner diameter of the small-diameter torsion coil spring portion 8 c is slightly larger than the outer diameter of the clutch surface 7 of the large-diameter shaft portion 3 a on the side of the connecting portion 8 b, and a minute gap is formed between the small-diameter torsion coil spring portion 8 c and the clutch surface 7. Has been. The other end (winding end) side has a natural inner diameter smaller than the outer diameter of the clutch surface 7 of the large-diameter shaft portion 3a, and the small-diameter torsion coil spring portion 8c has a tapered inner diameter. Yes. Therefore, as a result of incorporation in the expanded state, a part of the inner diameter surface of the small-diameter torsion coil spring portion 8 c is in elastic contact with the outer diameter surface of the clutch surface 7.

図１に示すように、プーリハブ３の小径軸部３ｃには保持リング９が嵌合されている。保持リング９は、小径軸部３ｃを回転自在に支持する軸受５と大径軸部３ａの端面とによって軸方向に非可動とされ、かつ、プーリ１およびプーリハブ３の小径軸部３ｃに対してそれぞれ回転自在とされている。   As shown in FIG. 1, a holding ring 9 is fitted to the small diameter shaft portion 3 c of the pulley hub 3. The retaining ring 9 is non-movable in the axial direction by the bearing 5 that rotatably supports the small-diameter shaft portion 3c and the end surface of the large-diameter shaft portion 3a, and the retaining ring 9 is not movable relative to the small-diameter shaft portion 3c of the pulley 1 and the pulley hub 3. Each is freely rotatable.

図５に示すように、保持リング９のクラッチばね８に対する対向面には、クラッチばね８の連設部側の端部が嵌合される支持溝１０が形成されている。支持溝１０は、大径捩じりコイルばね部８ａの巻き終り端部が嵌合される大径溝１０ａと、連設部８ｂが嵌合される円弧溝１０ｂと、小径捩じりコイルばね部８ｃの巻き始め端部が嵌合される小径溝１０ｃとからなり、上記大径溝１０ａおよび小径溝１０ｃは円弧溝１０ｂの一端から他端に向けて溝深さが次第に浅くなり、上記支持溝１０に対する嵌合によって、クラッチばね８の連設部側端部が保持リング９で受けられている。   As shown in FIG. 5, a support groove 10 in which an end portion of the clutch spring 8 on the side of the continuous portion is fitted is formed on the surface of the holding ring 9 facing the clutch spring 8. The support groove 10 includes a large-diameter groove 10a into which the winding end end of the large-diameter torsion coil spring portion 8a is fitted, an arc groove 10b into which the connecting portion 8b is fitted, and a small-diameter torsion coil spring. A small-diameter groove 10c into which the winding start end of the portion 8c is fitted, and the large-diameter groove 10a and the small-diameter groove 10c gradually decrease in depth from one end of the arc-shaped groove 10b to the other end. By the fitting to the groove 10, the end of the clutch spring 8 on the side of the continuous portion is received by the holding ring 9.

上記の構成から成るスプリングクラッチにおいて、エンジン補機としてのオルタネータの駆動に際しては、そのオルタネータの回転軸にプーリハブ３を取付けて回り止めし、プーリ１とクランク軸上のプーリ間にかけ渡されたベルトを介してクランク軸の回転をプーリ１に伝達する。   In the spring clutch having the above-described configuration, when driving the alternator as an engine auxiliary machine, a pulley hub 3 is attached to the rotating shaft of the alternator to prevent rotation, and a belt stretched between the pulley 1 and the pulley on the crankshaft is attached. The rotation of the crankshaft is transmitted to the pulley 1.

上記のような使用状態において、クランク軸の回転がプーリ１に伝達され、そのプーリ１が図１に示す軸受５側から見て左方向(図２の矢印で示す方向)に回転すると、クラッチばね８の大径捩じりコイルばね部８ａはプーリ１の内周に形成されたクラッチ面６との接触により拡径してクラッチ面６を内径側から締付ける。   In the use state as described above, the rotation of the crankshaft is transmitted to the pulley 1, and when the pulley 1 rotates in the left direction (direction indicated by the arrow in FIG. 2) when viewed from the bearing 5 side shown in FIG. The large-diameter torsion coil spring portion 8a of 8 is expanded in diameter by contact with the clutch surface 6 formed on the inner periphery of the pulley 1 and tightens the clutch surface 6 from the inner diameter side.

上記クラッチ面６に対する大径捩じりコイルばね部８ａの係合力が増大すると、プーリ１と共に大径捩じりコイルばね部８ａが回転し、その回転は連設部８ｂを介して保持リング９および小径捩じりコイルばね部８ｃに伝達され、上記保持リング９および小径捩じりコイルばね部８ｃが同方向に回転する。   When the engagement force of the large-diameter torsion coil spring portion 8a with respect to the clutch surface 6 increases, the large-diameter torsion coil spring portion 8a rotates together with the pulley 1, and the rotation of the holding ring 9 via the connecting portion 8b. Then, the holding ring 9 and the small diameter torsion coil spring portion 8c rotate in the same direction.

このとき、小径捩じりコイルばね部８ｃは大径捩じりコイルばね部８ａに対して巻き方向が逆向きであるため、負荷される回転力により小径捩じりコイルばね部８ｃが縮径し始め、弾性接触した先端（巻き終り端）部側から伝達するトルクの大きさに応じて徐々にクラッチ面７を締付け、プーリハブ３にトルクを伝達する。   At this time, since the winding direction of the small-diameter torsion coil spring portion 8c is opposite to that of the large-diameter torsion coil spring portion 8a, the small-diameter torsion coil spring portion 8c is reduced in diameter by the applied rotational force. Then, the clutch surface 7 is gradually tightened according to the magnitude of the torque transmitted from the elastically contacted tip (end of winding end) side, and the torque is transmitted to the pulley hub 3.

プーリ１からプーリハブ３への回転トルクの伝達状態において、プーリハブ３の回転速度がプーリ１の回転速度を上回ると、小径捩じりコイルばね部８ｃは拡径すると共に、大径捩じりコイルばね部８ａは縮径し、プーリ１がフリー回転し、プーリ１からプーリハブ３への回転伝達が遮断される。   When the rotational speed of the pulley hub 3 exceeds the rotational speed of the pulley 1 in the state of transmission of rotational torque from the pulley 1 to the pulley hub 3, the small-diameter torsion coil spring portion 8c expands in diameter and the large-diameter torsion coil spring. The diameter of the portion 8a is reduced, the pulley 1 rotates freely, and the rotation transmission from the pulley 1 to the pulley hub 3 is interrupted.

上記のように、実施の形態におけるスプリングクラッチにおいては、プーリ１とプーリハブ３の相互間におけるトルクの伝達が大径捩じりコイルばね部８ａの拡径と小径捩じりコイルばね部８ｃの縮径によるものであるため、スプリングクラッチの組立て時、クラッチばねは入力部材のクラッチ面と出力部材のクラッチ面間に組込むだけでよく、スプリングクラッチを容易に組立てることができる。   As described above, in the spring clutch according to the embodiment, torque transmission between the pulley 1 and the pulley hub 3 is caused by the expansion of the large-diameter torsion coil spring portion 8a and the contraction of the small-diameter torsion coil spring portion 8c. Since it depends on the diameter, when the spring clutch is assembled, the clutch spring only needs to be assembled between the clutch surface of the input member and the clutch surface of the output member, and the spring clutch can be easily assembled.

また、トルク伝達時、小径捩じりコイルばね部８ｃはプーリハブ３のクラッチ面７をトルクの大きさに応じて徐々に締付けるため、衝撃的なトルクが入力されると、その衝撃トルクは上記小径捩じりコイルばね部８ｃの縮径方向への弾性変形によって緩衝されることになり、クラッチばね８が疲労によって破損するようなことはなく、耐久性に優れたスプリングクラッチを得ることができる。   Further, when transmitting torque, the small-diameter torsion coil spring portion 8c gradually tightens the clutch surface 7 of the pulley hub 3 according to the magnitude of the torque. The torsion coil spring portion 8c is buffered by elastic deformation in the direction of diameter reduction, and the clutch spring 8 is not damaged by fatigue, and a spring clutch having excellent durability can be obtained.

さらに、プーリハブ３の小径軸部３ｃにクラッチばね８の連設部側端部を受ける保持リング９を設けて軸方向に非可動に、かつ、回転自在に支持したことにより、プーリ１とプーリハブ３の相互間におけるトルク伝達時に大径捩じりコイルばね部８ａおよび小径捩じりコイルばね部８ｃが軸方向に倒れ、あるいは、よれるのを防止することができ、プーリ１からプーリハブ３に安定したトルクを伝達することができる。   Further, a holding ring 9 for receiving the end of the clutch spring 8 on the side of the connecting portion is provided on the small diameter shaft portion 3c of the pulley hub 3 so as to be non-movable in the axial direction and rotatably supported. The large-diameter torsion coil spring portion 8a and the small-diameter torsion coil spring portion 8c can be prevented from falling or twisting in the axial direction during torque transmission between the pulley 1 and the pulley hub 3. Torque can be transmitted.

なお、実施の形態では、保持リング９にクラッチばね８の連設部側端部が嵌合される支持溝１０を形成してクラッチばね８の端部を受けるようにしたが、上記支持溝１０を省略して、保持リング９の平坦な面でクラッチばね８の連設部側の端部を受けるようにしてもよい。実施の形態のように、保持リング９に支持溝１０を形成することにより、その支持溝１０によって連設部８ｂの変形を抑制することができるため、上記連設部８ｂの疲労による破損を効果的に防止することができる。   In the embodiment, the support groove 10 in which the end of the clutch spring 8 is fitted to the holding ring 9 is formed to receive the end of the clutch spring 8. May be omitted and the end of the clutch spring 8 on the side of the continuous portion may be received by the flat surface of the retaining ring 9. By forming the support groove 10 in the retaining ring 9 as in the embodiment, the support groove 10 can suppress deformation of the continuous portion 8b, so that the damage due to fatigue of the continuous portion 8b is effective. Can be prevented.

また、小径捩じりコイルばね部８ｃの内径面をテーパとし、その小径端部をプーリハブ３のクラッチ面７に弾性接触させるようにしたが、上記小径捩じりコイルばね部８ｃの内径面を円筒面とし、その内径面の全体をプーリハブ３のクラッチ面７に弾性接触させるようにしてもよい。   Further, the inner diameter surface of the small-diameter torsion coil spring portion 8c is tapered, and the small-diameter end portion is brought into elastic contact with the clutch surface 7 of the pulley hub 3. A cylindrical surface may be used, and the entire inner diameter surface may be brought into elastic contact with the clutch surface 7 of the pulley hub 3.

この発明に係るスプリングクラッチの実施の形態を示す縦断正面図A longitudinal front view showing an embodiment of a spring clutch according to the present invention 図１のII−II線に沿った断面図Sectional view along the line II-II in FIG. 図１のIII−III線に沿った断面図Sectional view along line III-III in FIG. 図１のIV−IV線に沿った断面図Sectional view along line IV-IV in FIG. クラッチばねと保持リングを示す分解斜視図Exploded perspective view showing clutch spring and retaining ring

符号の説明Explanation of symbols

１ プーリ(入力部材)
３ プーリハブ(出力部材)
６ プーリのクラッチ面
７ プーリハブのクラッチ面
８ クラッチばね
８ａ 大径捩じりコイルばね部
８ｂ 連設部
８ｃ 小径捩じりコイルばね部
９ 保持リング 1 Pulley (input member)
3 Pulley hub (output member)
6 Clutch surface of pulley 7 Clutch surface of pulley hub 8 Clutch spring 8 a Large-diameter torsion coil spring portion 8 b Connecting portion 8 c Small-diameter torsion coil spring portion 9 Retaining ring

Claims (4)

円筒形のクラッチ面を内周に有する入力部材と、その入力部材の内側に組込まれて相対的に回転自在に支持された出力部材と、前記入力部材と出力部材間に組込まれて外周がクラッチ面と弾性接触する円筒形のクラッチばねとから成り、前記入力部材の一方向への回転時にクラッチ面との接触によりクラッチばねを拡径させて、入力部材と出力部材の相互間で回転トルクを伝達するようにしたスプリングクラッチにおいて、
前記クラッチばねが、前記クラッチ面に弾性接触する大径捩じりコイルばね部と、その大径捩じりコイルばね部の巻き終わり端に連設された連設部と、その連設部の端部に連設されて大径捩じりコイルばね部内に同軸上に配置された小径捩じりコイルばね部とからなり、前記大径捩じりコイルばね部と小径捩じりコイルばね部の巻き方向を逆巻きとし、前記出力部材の外周には前記小径捩じりコイルばね部と対向する部位の外周に、その小径捩じりコイルばね部により締付けられる円筒形のトルク出力用クラッチ面を形成したことを特徴とするスプリングクラッチ。 An input member having a cylindrical clutch surface on the inner periphery, an output member incorporated inside the input member and supported relatively rotatably, and an outer periphery clutched between the input member and the output member. A cylindrical clutch spring that elastically contacts the surface, and when the input member rotates in one direction, the clutch spring expands in diameter by contact with the clutch surface, and rotational torque is generated between the input member and the output member. In a spring clutch designed to transmit,
The clutch spring is a large-diameter torsion coil spring portion that elastically contacts the clutch surface, a continuous portion that is connected to the winding end of the large-diameter torsion coil spring portion, The large-diameter torsion coil spring portion and the small-diameter torsion coil spring portion are connected to the end portion and coaxially disposed in the large-diameter torsion coil spring portion. A cylindrical torque output clutch surface that is tightened by the small-diameter torsion coil spring portion on the outer periphery of the portion facing the small-diameter torsion coil spring portion on the outer periphery of the output member. A spring clutch characterized by being formed. 前記小径捩じりコイルばね部の内径面を、連設部側の巻き始め端から巻き終り端に向けて小径となるテーパ面とし、そのテーパ面の大径端部の内径をトルク出力用クラッチ面の外径より大径とし、テーパ面の小径端部の内径をトルク出力用クラッチ面の外径より小径とした請求項１に記載のスプリングクラッチ。   The inner diameter surface of the small-diameter torsion coil spring portion is a tapered surface having a smaller diameter from the winding start end on the connecting portion side toward the winding end end, and the inner diameter of the large-diameter end portion of the tapered surface is the torque output clutch. The spring clutch according to claim 1, wherein the outer diameter of the surface is larger than the outer diameter of the torque output clutch surface. 前記連設部が、大径捩じりコイルばね部の巻き終わり端を内向きに略１８０°折り曲げた円弧状の反転連設部からなる請求項１又は２に記載のスプリングクラッチ。   3. The spring clutch according to claim 1, wherein the continuous portion includes an arc-shaped reverse continuous portion in which a winding end of the large-diameter torsion coil spring portion is bent inward by approximately 180 °. 前記クラッチばねの軸方向一側に、そのクラッチばねの連設部側端部を受ける保持リングを設けて軸方向に非可動に、かつ、回転自在に支持した請求項１乃至３のいずれか１項に記載のスプリングクラッチ。   4. The clutch spring according to claim 1, wherein a holding ring that receives an end portion of the clutch spring on the side in the axial direction is provided so as to be non-movable and rotatable in the axial direction. The spring clutch according to the item.
JP2006286172A 2006-10-20 2006-10-20 Spring clutch Pending JP2008101740A (en)

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CN106065909A (en) * 2015-04-20 2016-11-02 舍弗勒技术股份两合公司 There is the executor using the rubbing device embracing spring element
CN107701606A (en) * 2016-08-09 2018-02-16 舍弗勒技术股份两合公司 Two-fold spring, rotating device and system to be actuated
CN109210132A (en) * 2017-06-29 2019-01-15 舍弗勒技术股份两合公司 Vibration absorber
CN112005026A (en) * 2018-06-13 2020-11-27 舍弗勒技术股份两合公司 Belt pulley decoupler
WO2019238169A1 (en) * 2018-06-13 2019-12-19 Schaeffler Technologies AG & Co. KG Belt pulley decoupler
JP2021175917A (en) * 2020-03-25 2021-11-04 エスアールアイ インターナショナルSRI International Failsafe brake device for robotic and other application
US11732768B2 (en) 2020-03-25 2023-08-22 Sri International Failsafe brake device for robotic and other applications
JP7340559B2 (en) 2020-03-25 2023-09-07 エスアールアイ インターナショナル Fail-safe braking devices for robots and other applications

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