JP3566243B2 - One-way clutch - Google Patents

One-way clutch Download PDF

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Publication number
JP3566243B2
JP3566243B2 JP2001289406A JP2001289406A JP3566243B2 JP 3566243 B2 JP3566243 B2 JP 3566243B2 JP 2001289406 A JP2001289406 A JP 2001289406A JP 2001289406 A JP2001289406 A JP 2001289406A JP 3566243 B2 JP3566243 B2 JP 3566243B2
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Japan
Prior art keywords
cage
sprag
ring
retainer
inner ring
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Expired - Fee Related
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JP2001289406A
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Japanese (ja)
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JP2002139080A (en
Inventor
哲明 沼田
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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Priority to JP2001289406A priority Critical patent/JP3566243B2/en
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  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Power Steering Mechanism (AREA)

Description

【0001】
【産業上の利用分野】
本発明は、例えば自動車のスタータや自動車変速機等に用いられる一方向クラッチに関する。
【0002】
【従来の技術】
従来、一方向クラッチとしては図5に示すものがある。この一方向クラッチは、複数のスプラグ51,51…と、上記スプラグ51の内側部51aを保持する金属製の内保持器52と、上記スプラグ51の外側部51bを保持する金属製の外保持器53と、上記スプラグ51を、図5(A)中時計回りの方向に付勢する環状のリボンスプリング55を備えている。上記外保持器53および内保持器52は、軸方向の一端に鍔部53bおよび52bを有している。上記一方向クラッチは、図示しない内輪と外輪の間に装着される。
【0003】
上記一方向クラッチは、上記内輪が図5(A)中時計回りに回転すると、スプラグ51の内側部51aと上記内輪との摩擦接触により、スプラグ51は、内側部51aを中心に反時計回りに空転側に傾動するので、上記内輪の回転トルクが上記外輪に伝わらず、上記内輪は空転する。
【0004】
また、上記内輪が図5(A)中反時計回りに回転すると、スプラグ51の内側部51aと上記内輪との摩擦接触により、スプラグ51が、内側部51aを中心に時計回りに起き上がり、スプラグ51のくさび作用で上記内輪と外輪がロックされ、上記内輪の回転トルクが外輪に伝達される。
【0005】
【発明が解決しようとする課題】
ところが、上記従来の一方向クラッチは、内保持器52と外保持器53の両方が金属で作られているので、重く、かつ高価であるという問題がある。
【0006】
そこで、最近、一方向クラッチを軽量化し、かつコストダウンする目的で、スプラグの揺動中心部を保持する内保持器に比べて必要強度が小さい外保持器をプラスチックで作製した一方向クラッチが提案されている(特開昭63−303232参照)。
【0007】
しかしながら、上記外保持器をプラスチックで作製した一方向クラッチにおいても、内保持器が金属製のままであるので、軽量化およびコストダウンが不十分であるという欠点がある。
【0008】
そこで、本発明の目的は、トルク伝達能力を損うことなく、十分な軽量化とコストダウンを実現できる一方向クラッチを提供することにある。
【0009】
【課題を解決するための手段】
上記目的を達成するため、本発明は、内輪と外輪との間に、周方向に所定の間隔をあけて配置される複数のスプラグと、上記スプラグの内側部を保持する内保持器と、上記スプラグの外側部を保持する外保持器と、上記スプラグを一方向に付勢するスプリングを備えた一方向クラッチにおいて、
上記内保持器はプラスチックで作製される一体の環状部材であり、かつ、中実の部材であるとともに周方向に一定間隔をあけてスプラグ保持用窓が設けられており
さらに、上記内保持器の軸方向一端から径方向内側に延びる鍔部を形成すると共に上記鍔部の内周面に上記内輪と摩擦接触する弦部を上記内保持器と一体に、かつ、上記内保持器と上記内輪との締め代を許容する範囲で変形可能で、かつ、上記内保持器の径方向厚さを増やす中実の増肉部として設けたことを特徴としている。
また、一実施例では、内輪と外輪との間に、周方向に所定の間隔をあけて配置される複数のスプラグと、上記スプラグの内側部を保持する内保持器と、上記スプラグの外側部を保持する外保持器と、上記スプラグを一方向に付勢するスプリングを備えた一方向クラッチにおいて、上記外保持器および内保持器はプラスチックで作製され、上記内保持器の作製に用いるプラスチックの強度を上記外保持器の作製に用いるプラスチックの強度よりも大きくした。
【0010】
また、上記内保持器は繊維強化プラスチックで作製されていることが望ましい。
【0011】
また、上記内保持器の内周面に上記内輪と摩擦接触する突起もしくは弦部を設けたことが望ましい。
【0012】
【作用】
上記一実施例の構成によれば、外保持器と内保持器の両方がプラスチックで作製されているので、上記外保持器または内保持器の少なくとも一方が金属製である場合に比べて、十分な軽量化とコストダウンが実現される。
【0013】
また、上記内保持器の作製に用いるプラスチックの強度を上記外保持器の作製に用いるプラスチックの強度よりも大きくしたので、上記スプラグの揺動中心部となる内側部は、上記内保持器によって、上記外保持器によって保持される上記スプラグの外側部よりもしっかりと保持される。したがって、スプラグの揺動動作が確実,安定になる。したがって、内輪に対する外輪のロックとリリースを確実にでき、十分なトルク伝達能力を維持できる。
【0014】
また、上記内保持器を繊維強化プラスチックで作製した場合には、上記内保持器の軽量化が特に促進させられると共に、強度が特に向上させられる。
【0015】
また、上記内保持器の内周面に上記内輪と摩擦接触する突起もしくは弦部を設けた場合には、上記内輪の回転に上記内保持器が追随させられ、上記内輪の動きが上記内保持器を介して確実にスプラグに伝達される。
【0016】
このため、上記内輪のトルク伝達方向の回転に追随する内保持器によって、上記スプラグが確実に起立方向に揺動するので、上記内輪と外輪が確実にロックされ、内輪から外輪へのトルク伝達効率が向上する。また、上記内輪の空転方向の回転に追随する内保持器によって、上記スプラグが確実に傾斜方向に揺動させられるので、上記内輪から外輪が確実にリリースされ、内輪の空転時にスプラグと内輪との接触面圧が低下して、スプラグと内輪との摩擦が低減する。
【0017】
【実施例】
以下、本発明の一方向クラッチを図示の実施例により詳細に説明する。
【0018】
図1に、第1参考例を示す。この参考例の一方向クラッチは、複数のスプラグ1と内保持器2と外保持器3および環状のリボンスプリング5を備え、図示しない内輪と外輪の間に装着される。
【0019】
上記内保持器2と外保持器3およびリボンスプリング5は、夫々周方向に一定間隔をあけて設けた窓2aと窓3aおよび5aを有している。そして、内保持器2は、上記窓2aに嵌めたスプラグ1の内側部1aを保持し、外保持器3は、上記窓3aに嵌めたスプラグ1の外側部1bを保持する。また、リボンスプリング5は上記窓5aに嵌めたスプラグ1を上記内輪および外輪との噛み合う方向(図1(A)中時計回りの方向)に付勢する。
【0020】
上記外保持器3は、軸方向の一端から径方向外側に延びる鍔部3bを有している。また、内保持器2は、軸方向の一端から径方向内側に延びる鍔部2bを有している。
【0021】
上記外保持器3はプラスチックで作られている。また、上記内保持器2は、上記外保持器3の作製に用いるプラスチックの強度よりも大きな強度を有する繊維強化プラスチックで作られている。
【0022】
上記構成の一方向クラッチは、上記内輪が図1(A)中時計回りに回転すると、スプラグ1の内側部1aと上記内輪との摩擦接触により、スプラグ1は、内側部1aを中心に反時計回りに空転側に傾動するので、上記内輪の回転トルクが上記外輪に伝わらず、上記内輪は空転する。
【0023】
また、上記内輪が図1(A)中反時計回りに回転すると、スプラグ1の内側部1aと上記内輪との摩擦接触により、スプラグ1が、内側部1aを中心に時計回りに起き上がり、スプラグ1のくさび作用で上記内輪と外輪がロックされ、上記内輪の回転トルクが外輪に伝達される。
【0024】
この参考例は、外保持器3と内保持器2の両方がプラスチックで作製されているので、上記外保持器または内保持器の少なくとも一方が金属製である従来例に比べて、十分な軽量化とコストダウンを実現できる。
【0025】
また、内保持器2の作製に用いるプラスチックの強度を外保持器3の作製に用いるプラスチックの強度よりも大きくしたので、スプラグ1の内側部1aは、内保持器2によって、外保持器3によって保持されるスプラグ1の外側部1bよりもしっかりと保持される。
【0026】
つまり、スプラグ1の揺動中心部となる内側部1aは、揺動中心部とならない外側部1bよりもしっかりと保持され、スプラグ1の揺動動作が確実,安定になり、内輪に対する外輪のロックとリリースを確実にでき、十分なトルク伝達能力を維持できる。
【0027】
また、内保持器2を繊維強化プラスチックで作製したので、内保持器2の軽量化を促進できると共に、強度を特に向上できる。
【0028】
また、外保持器3および内保持器2がプラスチック製であるので、上記鍔部3bおよび2bを容易に一体形成でき、鍔部3bおよび2bによって、外保持器3および内保持器2を容易に強度アップできる。
【0029】
次に、第2参考例を図2に示す。この参考例は、鍔部3bおよび2bを外保持器3および内保持器2の軸方向の両端に設けた点のみが第1参考例と異なる。この第2参考例によれば、第1参考例よりも、外保持器3および内保持器2の強度を向上させることができる。
【0030】
また、上記第1,第2参考例では、内保持器2の鍔部2bの内周面を円形にしたが、図3(A)に示すように、鍔部2bの内周面に内輪と摩擦接触する弦部20を設けて、内周面を多角形にしてもよい。また、図3(B)に示すように、鍔部2bの内周面に内輪と摩擦接触する複数の突起21を設けてもよい。さらに、図3(C)に示すように、内保持器2の内周面の軸方向中央に内輪と摩擦接触する複数の突起22を設けてもよい。図3(A)〜(C)に示すように、内保持器2の内周面に内輪と摩擦接触する弦部20や突起21,22を設けた場合には、上記内輪の回転に内保持器2が追随させられ、上記内輪の動きが内保持器2を介して確実にスプラグ1に伝達される。このため、上記内輪のトルク伝達方向の回転によって、スプラグ1が確実に起立方向に揺動するので、スプラグ1のくさび作用によって上記内輪と外輪が確実にロックされ、内輪から外輪へのトルク伝達効率が向上する。一方、上記内輪の空転方向の回転によって、スプラグ1が確実に傾斜方向に揺動させられるので、上記内輪から外輪が確実にリリースされ、内輪の空転時にスプラグ1と内輪との接触面圧が低下する。したがって、空転時のスプラグ1と内輪の摩耗を低減できる。
【0031】
また、図4(A)に示すように、内保持器2の軸方向両端に形成した鍔部2b,2bの内周に内輪と摩擦接触する弦部20を設けた場合、および図4(B)に示すように、上記両端の鍔部2b,2bの内周に内輪と摩擦接触する突起21を設けた場合には、内保持器2の軸方向両端において内保持器2と内輪とが摩擦接触するので、内保持器2の軸方向片側だけに弦部20や突起21を設けた場合よりも、更に確実に内輪の回転に内保持器2が追随させられ、内輪の動きが内保持器2を介して確実にスプラグ1に伝達できる。したがって、上記内輪から外輪へのトルク伝達効率および空転時のスプラグ1と内輪の摩耗低減効果を特に大きくできる。
【0032】
また、内保持器2はプラスチックで作製されるので、内保持器が金属製である従来例と異なり、上記弦部20および突起21,22を容易に一体形成できる。
【0033】
また、内保持器2はプラスチックで作製されるので、内保持器2と内輪との締め代許容範囲が広く、締め代の管理が容易である。
【0034】
【発明の効果】
以上より明らかなように、本発明の一方向クラッチは、内保持器はプラスチックで作製される一体の環状部材であるとともに周方向に一定間隔をあけてスプラグ保持用窓が設けられ、さらに、上記内保持器の軸方向一端から径方向内側に延びる鍔部を形成すると共に上記鍔部の内周面に上記内輪と摩擦接触する弦部を上記内保持器と一体に設けた。
また、一実施例では、外保持器と内保持器の両方がプラスチックで作製されているので、上記外保持器または内保持器の少なくとも一方が金属製である従来例に比べて、十分な軽量化とコストダウンを実現できる。
【0035】
また、上記一実施例では、上記内保持器の作製に用いるプラスチックの強度を上記外保持器の作製に用いるプラスチックの強度よりも大きくしたので、スプラグの揺動中心部となる内側部は、内保持器によって、外保持器によって保持される上記スプラグの外側部よりもしっかりと保持される。したがって、スプラグの揺動動作を確実,安定にできる。したがって、内輪に対する外輪のロックとリリースを確実にでき、十分なトルク伝達能力を維持できる。
【0036】
また、上記内保持器を繊維強化プラスチックで作製した場合には、上記内保持器の軽量化を特に促進できると共に、強度を特に向上できる。
【0037】
また、上記内保持器の内周面に上記内輪と摩擦接触する突起もしくは弦部を設けた場合には、上記内輪の回転に上記内保持器が追随させられ、上記内輪の動きが上記内保持器を介して確実にスプラグに伝達される。このため、上記内輪のトルク伝達方向の回転に追随する内保持器によって、上記スプラグが確実に起立方向に揺動するので、上記内輪と外輪が確実にロックされ、内輪から外輪へのトルク伝達効率を向上できる。また、上記内輪の空転方向の回転に追随する内保持器によって、上記スプラグが確実に傾斜方向に揺動させられるので、上記内輪から外輪が確実にリリースされ、内輪の空転時にスプラグと内輪との接触面圧が低下して、スプラグと内輪の摩耗を低減できる。
【0038】
また、内保持器はプラスチックで作製されるので、内保持器が金属製である従来例と異なり、上記弦部および突起を容易に一体形成できる。
【0039】
また、内保持器はプラスチックで作製されているので、内保持器と内輪との締め代許容範囲が広く、締め代の管理が容易である。
【図面の簡単な説明】
【図1】本発明の一方向クラッチの第1参考例の平面図と断面図を含む図である。
【図2】本発明の一方向クラッチの第2参考例の平面図と断面図を含む図である。
【図3】本発明の一方向クラッチの第1実施例の内保持器を示す図3 を含み、上記第1参考例の内保持器の変形例を示す図である。
【図4】本発明の一方向クラッチの第2実施例の内保持器を示す図4 を含み、上記第2参考例の内保持器の変形例を示す図である。
【図5】従来の一方向クラッチの平面図と断面図を含む図である。
【符号の説明】
1,51 スプラグ 2,52 内保持器
3,53 外保持器 5,55 リボンスプリング
1a,51a 内側部 1b,51b 外側部
2a,3a,5a 窓 2b,3b,52b,53b 鍔部
20 弦部 21,22 突起
[0001]
[Industrial applications]
The present invention relates to a one-way clutch used for, for example, a starter of an automobile or an automobile transmission.
[0002]
[Prior art]
Conventionally, there is a one-way clutch shown in FIG. The one-way clutch includes a plurality of sprags 51, 51, a metal inner cage 52 for holding an inner portion 51a of the sprag 51, and a metal outer cage for holding an outer portion 51b of the sprag 51. 53 and an annular ribbon spring 55 for urging the sprag 51 in a clockwise direction in FIG. 5A. The outer cage 53 and the inner cage 52 have flanges 53b and 52b at one end in the axial direction. The one-way clutch is mounted between an inner wheel and an outer wheel (not shown).
[0003]
When the inner race rotates clockwise in FIG. 5A, the one-way clutch causes the sprags 51 to rotate counterclockwise about the inner race 51a due to frictional contact between the inner portion 51a of the sprag 51 and the inner race. Since it tilts to the idling side, the rotational torque of the inner wheel is not transmitted to the outer wheel, and the inner wheel spins.
[0004]
When the inner ring rotates counterclockwise in FIG. 5A, the sprag 51 rises clockwise around the inner portion 51a due to frictional contact between the inner portion 51a of the sprag 51 and the inner ring. The inner ring and the outer ring are locked by the wedge action, and the rotational torque of the inner ring is transmitted to the outer ring.
[0005]
[Problems to be solved by the invention]
However, the conventional one-way clutch has a problem that it is heavy and expensive because both the inner retainer 52 and the outer retainer 53 are made of metal.
[0006]
Therefore, recently, for the purpose of reducing the weight and cost of the one-way clutch, a one-way clutch in which the outer cage, which requires less strength than the inner cage that holds the center portion of the sprag swing, is made of plastic has been proposed. (See JP-A-63-303232).
[0007]
However, even in the one-way clutch in which the outer retainer is made of plastic, there is a disadvantage that the weight and cost reduction are insufficient because the inner retainer is made of metal.
[0008]
Therefore, an object of the present invention is to provide a one-way clutch which can realize a sufficient weight reduction and cost reduction without impairing the torque transmission ability.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plurality of sprags arranged at predetermined intervals in a circumferential direction between an inner ring and an outer ring, an inner retainer for holding an inner portion of the sprag, In an outer retainer that holds an outer portion of a sprag, and a one-way clutch including a spring that biases the sprag in one direction,
The inner retainer is an annular member integrally made of plastic, and has sprag retainer window at a predetermined interval in the circumferential direction as well as a solid member is provided,
Further, to form a flange portion extending radially inwardly from one axial end of the inner cage, a chord portion for frictional contact with the inner ring on the inner peripheral surface of the flange portion, integrally with the inner retainer, and The inner retainer and the inner ring are characterized by being provided as a solid thickened portion that is deformable within a range that allows the interference between the inner retainer and increases the radial thickness of the inner retainer .
Further, in one embodiment, a plurality of sprags arranged at predetermined intervals in a circumferential direction between an inner ring and an outer ring, an inner retainer for holding an inner part of the sprag, and an outer part of the sprag And a one-way clutch provided with a spring for urging the sprags in one direction, wherein the outer cage and the inner cage are made of plastic, and the outer cage and the inner cage are made of plastic. The strength was higher than the strength of the plastic used for manufacturing the outer cage.
[0010]
Further, the inner cage is desirably made of fiber reinforced plastic.
[0011]
In addition, it is desirable that a protrusion or a chord portion that comes into frictional contact with the inner ring be provided on the inner peripheral surface of the inner cage.
[0012]
[Action]
According to the configuration of the one embodiment , since both the outer cage and the inner cage are made of plastic, compared to the case where at least one of the outer cage or the inner cage is made of metal, Lightweight and cost reduction are realized.
[0013]
Also, since the strength of the plastic used for manufacturing the inner cage is greater than the strength of the plastic used for manufacturing the outer cage, the inner part that is the swing center portion of the sprag is formed by the inner cage. It is more securely held than the outer part of the sprag held by the outer cage. Therefore, the swing operation of the sprag becomes reliable and stable. Therefore, locking and release of the outer ring with respect to the inner ring can be ensured, and sufficient torque transmission capability can be maintained.
[0014]
When the inner cage is made of fiber-reinforced plastic, the weight of the inner cage is particularly promoted, and the strength is particularly improved.
[0015]
Further, when a projection or a chord is provided on the inner peripheral surface of the inner cage in frictional contact with the inner ring, the inner cage follows the rotation of the inner ring, and the movement of the inner ring is controlled by the inner holding. Is reliably transmitted to the sprag via the vessel.
[0016]
Therefore, the sprags are reliably swung in the rising direction by the inner cage that follows the rotation of the inner ring in the torque transmission direction, so that the inner ring and the outer ring are securely locked, and the torque transmission efficiency from the inner ring to the outer ring is improved. Is improved. Further, since the sprags are reliably swung in the inclined direction by the inner cage that follows the rotation of the inner ring in the idling direction, the outer ring is reliably released from the inner ring, and the sprag and the inner ring are rotated during the idling of the inner ring. The contact surface pressure is reduced, and the friction between the sprag and the inner ring is reduced.
[0017]
【Example】
Hereinafter, the one-way clutch of the present invention will be described in detail with reference to the illustrated embodiment.
[0018]
FIG. 1 shows a first reference example. The one-way clutch of this reference example includes a plurality of sprags 1, an inner cage 2, an outer cage 3, and an annular ribbon spring 5, and is mounted between an inner ring and an outer ring (not shown).
[0019]
The inner retainer 2, the outer retainer 3, and the ribbon spring 5 each have a window 2a and windows 3a and 5a provided at regular intervals in the circumferential direction. The inner cage 2 holds the inner part 1a of the sprag 1 fitted in the window 2a, and the outer cage 3 holds the outer part 1b of the sprag 1 fitted in the window 3a. Further, the ribbon spring 5 urges the sprag 1 fitted in the window 5a in a direction in which the sprags 1 mesh with the inner ring and the outer ring (clockwise in FIG. 1A).
[0020]
The outer retainer 3 has a flange 3b extending radially outward from one end in the axial direction. Further, the inner cage 2 has a flange portion 2b extending radially inward from one end in the axial direction.
[0021]
The outer cage 3 is made of plastic. The inner cage 2 is made of a fiber-reinforced plastic having a strength greater than that of the plastic used for manufacturing the outer cage 3.
[0022]
When the inner race rotates clockwise in FIG. 1A, the one-way clutch of the above configuration causes the sprags 1 to rotate counterclockwise around the inner race 1a due to frictional contact between the inner part 1a of the sprag 1 and the inner ring. Since the inner wheel rotates around to the idling side, the rotation torque of the inner wheel is not transmitted to the outer wheel, and the inner wheel idles.
[0023]
When the inner race rotates counterclockwise in FIG. 1 (A), the sprags 1 rise up clockwise around the inner race 1a due to frictional contact between the inner part 1a of the sprag 1 and the inner race. The inner ring and the outer ring are locked by the wedge action, and the rotational torque of the inner ring is transmitted to the outer ring.
[0024]
In this reference example, since both the outer cage 3 and the inner cage 2 are made of plastic, a sufficiently lighter weight than the conventional example in which at least one of the outer cage and the inner cage is made of metal. And cost reduction can be realized.
[0025]
Further, since the strength of the plastic used for manufacturing the inner cage 2 is made larger than the strength of the plastic used for manufacturing the outer cage 3, the inner part 1 a of the sprag 1 is formed by the inner cage 2 and the outer cage 3. It is more firmly held than the outer part 1b of the sprag 1 to be held.
[0026]
In other words, the inner portion 1a serving as the swing center portion of the sprag 1 is more firmly held than the outer portion 1b not serving as the swing center portion, so that the swing operation of the sprag 1 becomes more reliable and stable, and the outer ring is locked to the inner ring. Release can be ensured and sufficient torque transmission ability can be maintained.
[0027]
Further, since the inner cage 2 is made of fiber reinforced plastic, the weight of the inner cage 2 can be promoted, and the strength can be particularly improved.
[0028]
Further, since the outer cage 3 and the inner cage 2 are made of plastic, the flanges 3b and 2b can be easily formed integrally, and the outer cage 3 and the inner cage 2 can be easily formed by the flanges 3b and 2b. Strength can be increased.
[0029]
Next, a second reference example is shown in FIG. This reference example differs from the first reference example only in that the flanges 3b and 2b are provided at both axial ends of the outer cage 3 and the inner cage 2. According to the second reference example, than the first reference example, it is possible to improve the strength of the outer cage 3 and the inner retainer 2.
[0030]
In the first and second reference examples, the inner peripheral surface of the flange 2b of the inner retainer 2 is circular. However, as shown in FIG. 3A, an inner ring is formed on the inner peripheral surface of the flange 2b. A chord portion 20 that comes into frictional contact may be provided to make the inner peripheral surface polygonal. Further, as shown in FIG. 3 (B), a plurality of protrusions 21 that are in frictional contact with the inner ring may be provided on the inner peripheral surface of the flange 2b. Further, as shown in FIG. 3 (C), a plurality of protrusions 22 that come into frictional contact with the inner ring may be provided at the axial center of the inner peripheral surface of the inner cage 2. As shown in FIGS. 3 (A) to 3 (C), when the chords 20 and the projections 21 and 22 which are in frictional contact with the inner ring are provided on the inner peripheral surface of the inner retainer 2, the inner holding is performed by rotating the inner ring. The movement of the inner ring is reliably transmitted to the sprag 1 via the inner retainer 2. Therefore, the sprags 1 are reliably swung in the upright direction by the rotation of the inner ring in the torque transmission direction, and the inner ring and the outer ring are reliably locked by the wedge action of the sprags 1, and the efficiency of torque transmission from the inner ring to the outer ring Is improved. On the other hand, since the sprags 1 are reliably swung in the inclined direction by the rotation of the inner ring in the idling direction, the outer ring is reliably released from the inner ring, and the contact surface pressure between the sprag 1 and the inner ring during idling of the inner ring is reduced. I do. Therefore, wear of the sprags 1 and the inner ring during idling can be reduced.
[0031]
Also, as shown in FIG. 4 (A), when a chord 20 which is in frictional contact with the inner ring is provided on the inner periphery of the flanges 2b, 2b formed at both ends in the axial direction of the inner cage 2, and FIG. As shown in FIG. 2), when the protrusions 21 that come into frictional contact with the inner ring are provided on the inner circumferences of the flanges 2b, 2b at both ends, friction between the inner cage 2 and the inner ring at both axial ends of the inner cage 2 occurs. Because of the contact, the inner cage 2 is made to follow the rotation of the inner race more reliably than when the chords 20 and the protrusions 21 are provided only on one side in the axial direction of the inner cage 2, and the movement of the inner race is reduced. 2 can be reliably transmitted to the sprag 1. Therefore, the torque transmission efficiency from the inner race to the outer race and the effect of reducing the wear of the sprags 1 and the inner race during idling can be particularly increased.
[0032]
Further, since the inner cage 2 is made of plastic, unlike the conventional example in which the inner cage is made of metal, the chord 20 and the projections 21 and 22 can be easily formed integrally.
[0033]
Further, since the inner cage 2 is made of plastic, the allowable range of the interference between the inner cage 2 and the inner ring is wide, and the management of the interference is easy.
[0034]
【The invention's effect】
As is clear from the above, in the one-way clutch of the present invention, the inner retainer is an integral annular member made of plastic, and is provided with sprag retaining windows at regular intervals in the circumferential direction. A flange portion extending radially inward from one axial end of the inner retainer is formed, and a chord portion that frictionally contacts the inner ring is provided on the inner peripheral surface of the flange portion integrally with the inner retainer .
Further, in one embodiment, since both the outer cage and the inner cage are made of plastic, a sufficiently light weight compared to the conventional example in which at least one of the outer cage and the inner cage is made of metal. And cost reduction can be realized.
[0035]
Further, in the above-described embodiment, since the strength of the plastic used for manufacturing the inner cage is set to be greater than the strength of the plastic used for manufacturing the outer cage, the inner portion serving as the swing center portion of the sprags has the inner portion. The retainer is more securely held than the outer portion of the sprag held by the outer retainer. Therefore, the swing operation of the sprag can be reliably and stably performed. Therefore, locking and release of the outer ring with respect to the inner ring can be ensured, and sufficient torque transmission capability can be maintained.
[0036]
When the inner cage is made of fiber-reinforced plastic, the weight of the inner cage can be particularly reduced, and the strength can be particularly improved.
[0037]
Further, when a projection or a chord is provided on the inner peripheral surface of the inner cage in frictional contact with the inner ring, the inner cage follows the rotation of the inner ring, and the movement of the inner ring is controlled by the inner holding. Is reliably transmitted to the sprag via the vessel. Therefore, the sprags are reliably swung in the rising direction by the inner cage that follows the rotation of the inner ring in the torque transmission direction, so that the inner ring and the outer ring are securely locked, and the torque transmission efficiency from the inner ring to the outer ring is improved. Can be improved. Further, since the sprags are reliably swung in the inclined direction by the inner cage that follows the rotation of the inner ring in the idling direction, the outer ring is reliably released from the inner ring, and the sprag and the inner ring are rotated during the idling of the inner ring. The contact surface pressure is reduced, and the wear of the sprag and the inner ring can be reduced.
[0038]
Further, since the inner retainer is made of plastic, unlike the conventional example in which the inner retainer is made of metal, the chord and the projection can be easily formed integrally.
[0039]
Further, since the inner cage is made of plastic, the allowable range of the interference between the inner cage and the inner ring is wide, and the management of the interference is easy.
[Brief description of the drawings]
FIG. 1 includes a plan view and a sectional view of a first reference example of a one-way clutch of the present invention.
2 is a diagram including a plan view and a sectional view of a second reference example of the one-way clutch of the present invention.
[3] include 3 showing the inner cage of the first embodiment of the one-way clutch of the present invention (A), it is a diagram showing a modified example of the inner cage of the first embodiment.
FIG. 4 is a view showing a modified example of the inner cage of the second reference example , including FIG. 4 ( A ) showing the inner cage of a second embodiment of the one-way clutch of the present invention .
FIG. 5 includes a plan view and a cross-sectional view of a conventional one-way clutch.
[Explanation of symbols]
1,51 sprag 2,52 inner retainer 3,53 outer retainer 5,55 ribbon spring 1a, 51a inner part 1b, 51b outer part 2a, 3a, 5a window 2b, 3b, 52b, 53b flange part 20 chord part 21 , 22 protrusion

Claims (1)

内輪と外輪との間に、周方向に所定の間隔をあけて配置される複数のスプラグと、上記スプラグの内側部を保持する内保持器と、上記スプラグの外側部を保持する外保持器と、上記スプラグを一方向に付勢するスプリングを備えた一方向クラッチにおいて、
上記内保持器はプラスチックで作製される一体の環状部材であり、かつ、中実の部材であるとともに周方向に一定間隔をあけてスプラグ保持用窓が設けられており
さらに、上記内保持器の軸方向一端から径方向内側に延びる鍔部を形成すると共に上記鍔部の内周面に上記内輪と摩擦接触する弦部を上記内保持器と一体に、かつ、上記内保持器と上記内輪との締め代を許容する範囲で変形可能で、かつ、上記内保持器の径方向厚さを増やす中実の増肉部として設けたことを特徴とする一方向クラッチ。
Between the inner ring and the outer ring, a plurality of sprags arranged at predetermined intervals in the circumferential direction, an inner retainer holding an inner part of the sprag, and an outer retainer holding an outer part of the sprag A one-way clutch including a spring that biases the sprag in one direction;
The inner retainer is an annular member integrally made of plastic, and has sprag retainer window at a predetermined interval in the circumferential direction as well as a solid member is provided,
Further, to form a flange portion extending radially inwardly from one axial end of the inner cage, a chord portion for frictional contact with the inner ring on the inner peripheral surface of the flange portion, integrally with the inner retainer, and Characterized in that it is provided as a solid thickened portion that is deformable within a range that allows the interference between the inner cage and the inner ring, and that increases the radial thickness of the inner cage. clutch.
JP2001289406A 2001-09-21 2001-09-21 One-way clutch Expired - Fee Related JP3566243B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001289406A JP3566243B2 (en) 2001-09-21 2001-09-21 One-way clutch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001289406A JP3566243B2 (en) 2001-09-21 2001-09-21 One-way clutch

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP3288599A Division JPH05126169A (en) 1991-11-05 1991-11-05 One-way clutch

Publications (2)

Publication Number Publication Date
JP2002139080A JP2002139080A (en) 2002-05-17
JP3566243B2 true JP3566243B2 (en) 2004-09-15

Family

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Family Applications (1)

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Publication number Priority date Publication date Assignee Title
JP4807023B2 (en) * 2005-09-28 2011-11-02 株式会社ジェイテクト One-way clutch
JP2017053453A (en) 2015-09-10 2017-03-16 Ntn株式会社 Sprag type one-way clutch

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