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JP4285864B2 - One-way clutch - Google Patents
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JP4285864B2 - One-way clutch - Google Patents

One-way clutch Download PDF

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Publication number
JP4285864B2
JP4285864B2 JP33996299A JP33996299A JP4285864B2 JP 4285864 B2 JP4285864 B2 JP 4285864B2 JP 33996299 A JP33996299 A JP 33996299A JP 33996299 A JP33996299 A JP 33996299A JP 4285864 B2 JP4285864 B2 JP 4285864B2
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JP
Japan
Prior art keywords
spring piece
spring
roller
pocket
clutch
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Expired - Lifetime
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JP33996299A
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Japanese (ja)
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JP2001153157A (en
Inventor
浩義 伊藤
声一 高田
昌弘 栗田
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NTN Corp
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NTN Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、ファックス、複写機等の事務機に適した一方向クラッチに関し、特に金属製のばね片に関するものである。
【0002】
【従来の技術】
この種の一方向クラッチとして、この発明者らは先に特願平7−252511号(特開平9−89011号)により特許出願をしている。この特許出願に係る一方向クラッチは、図9から図14に示すように、外輪1の内周面に一定間隔をおいてポケット10を設け、そのポケット10にローラ3を挿入し、上記ポケット10の底面に回転の一方向に間隙が狭くなる傾斜面を形成し(図11の角度θ参照)、各ポケット10の上記傾斜面の間隙の狭くなる側と反対側の内部にばね収納凹所8を設けている。上記のばね収納凹所8に金属製ばね片9を収納し、そのばね片9によりローラ3を付勢し傾斜面に押圧する。上記外輪1のポケット10の両端面を蓋部材4と外装体5により閉塞している。
【0003】
ポケット10の開口幅W(図11参照)は、ローラ3の直径より小さく形成され、ローラ3はその一部が開口から部分的に露出して軸6に接触する。
【0004】
蓋4は、外輪1に対し何らかの手段で嵌着すればよいが、図示の場合は、外装部材5に嵌着している。即ち、外装部材5の筒部17を外輪1に被せ、その外装部材5の閉塞端面18で外輪1の一方の端面を閉塞し、その筒部17の端部内周面に形成した嵌合溝19に蓋4の外周面のリブ21を嵌合することにより取付けている。
【0005】
上記外装部材5の筒部17の内周面には、軸方向に係合リブ22が形成され、外輪1の外周面の係合溝23と相互に係合させることにより外輪1と外装部材5との回り止めを図っている。上記の蓋4及び外装部材5にはそれぞれ軸穴24、25が設けられる。
【0006】
なお、外輪1のポケット10の一端を閉塞するために、上記の場合は外装部材5に閉塞端面18を形成しているが、独立した蓋で閉塞してもよく、或いは外輪1のポケット10自体に閉塞壁を形成してもよい。また、筒部17と蓋4とを一体化し、閉塞端面18に代えて該筒部17又は外輪1に嵌着される独立した蓋を用いたり、外輪1のポケット10自体に閉塞壁を形成したりする構成を採用してもよい。
【0007】
上記の構成でなる一方向クラッチは、外輪1の内径側に軸6を挿入して使用に供され、ポケット10の傾斜面と軸6との間でくさび形空所7を形成する。通常の状態でローラ3はばね片9によりくさび形空所7の狭い方に付勢され前記の傾斜面に押圧される。その付勢方向に軸6が回転する(図10の矢印参照)とロックして軸6のトルクを外輪1及びこれと一体の外装体5に伝達する。軸6が逆回転すると、ローラ3がばね片9を圧縮しながらくさび形空所7の広い方に移動するため、前記のロックが解除され軸6は空転する。
【0008】
ところで、上記の各金属製ばね片9はその基部12が金属製の環部11と一体化され、これにより1つのクラッチばね2が構成される。このクラッチばね2は1枚の弾力性ある金属板を打ち抜いて形成されるものであり、図14はその打ち抜き状態を示すものである。ばね片9の長さをLで示し、材料の打ち抜き半径をRで示す。
【0009】
上記の環部11は外輪1の内径とほぼ等しい内径を有し、その環部11の外周部に周方向に等間隔をおいて、図示の場合7枚のばね片9を立上げるための7か所の基部12が設けられる。
【0010】
各基部12において、環部11の中心点Oのまわりを角度αでローラ3の数で7等分した等角度間隔の半径線上にばね片9の立上げ折り曲げ線13が設けられ、更にその立上げ折り曲げ線13と内径との間に、隣接する他の基部12との連結部14が設けられる。
【0011】
ばね片9は上記の立上げ折り曲げ線13に対して直角方向に、かつ隣接する基部12の斜辺15に沿って延び出しており、各ばね片9は環部11のまわりに相互に一定の角度β(=α)をもって羽根車状に突き出している。
【0012】
前記の各ばね片9の中間部分には、前記の立上げ折り曲げ線13と平行の中間折り曲げ線16が設けられ、前記立上げ折り曲げ線13によって基部12から直角に立上げられると共に、中間折り曲げ線16によって基部12側に折り返され、(図14(b)参照)その折り返された先端部がローラ3に押し当てられる(図12参照)。
【0013】
【発明が解決しようとする課題】
上記構成の一方向クラッチにおいて、ポケット10の傾斜面の角度やローラ3の直径等の大きさ如何では、図13に示すようにローラ3に対するばね片9の先端部がB点においてエッジ当たりになることがある。その場合のエッジ角をδで示す。
【0014】
また、ばね収納凹所8の奥行き方向Y1 と、ばね片9の長さ方向Y2 との間に角度εが生じ、ばね片9が収納凹所8の内壁の点C等において干渉することがある。このような干渉が生じると、ばね片9が圧縮されたわみ代mが制限される。
【0015】
ばね片9が上記のようなエッジ当たりになったり、ばね収納凹所8と干渉すると、外輪1のポケット10の傾斜面にローラ3を正しく押圧することができず、また、ばね片9のたわみ代mが小さくなり適切なばね荷重を発揮することができない。
【0016】
そこで、この発明はばね片のエッジ当たりを防止してローラを傾斜面に正しく押圧できるようにすると共に、ばね片のたわみ代を十分に大きくとれるようにしてクラッチ性能の向上を図ることを課題とする。
【0017】
【課題を解決するための手段】
上記の課題を達成するために、この発明の一方向クラッチは、外輪の内周面に一定間隔をおいてポケットを設け、そのポケットにローラを挿入し、上記ポケットの底面に回転の一方向に間隙が狭くなる傾斜面を形成し、上記ローラをその傾斜の方向に付勢するばねを各ポケットに収納し、上記外輪のポケットの両端面を蓋部材で閉塞し、上記ポケットの外輪内周面側の開口幅を上記ローラの直径より小さく形成し、上記ばねを各ポケットに対応して設けられた一定間隔の金属製のばね片と、各ばね片の一端を一体に結合した金属製の環部とにより形成してなる一方向クラッチにおいて、上記ばねの環部の外周部に各ばね片の基部を形成し、各基部の一端から上記ばね片を折り曲げて立上げ、該ばね片の立上げ折り曲げ線を、上記ローラの数に等分された等角度間隔の半径線を基準位置として、当該ばね片の基部側に所定量オフセットした位置に設定した構成とした。
【0018】
また、上記ばね片の先端部を上記ローラの長手方向の中間部に押し当てた構成や、上記ばね片と環部とを一枚の金属板を打ち抜いて形成し、該ばね片を折り曲げて該環部に対して立ち上げた構成をとることができる。
【0019】
【作用】
上記の一方向クラッチは、外輪の内径側に軸を挿入し、外輪の外径面に外装体を嵌着して使用に供される。通常の状態では、ローラはポケットの傾斜面と軸との間で形成されたくさび形空所の狭い方向に付勢される。その付勢方向に軸が回転するとロック状態となり軸のトルクを外輪及びこれと一体の外装体に伝達する。
【0020】
軸が逆回転すると、ローラがばねを圧縮しながらくさび形空所の広い方に移動するため、前記のロックが解除され軸は空転する。
【0021】
ばね片の立上げ折り曲げ線が前記のように基準位置からオフセットしているため、ばね片のローラに対するエッジ当たりが防止され、ローラは正しい姿勢でポケットの傾斜面に押し当てられる。また、ばね収納凹所の奥行き方向と、ばね片の長さ方向との間の角度はゼロか、又は小さいため、ばね片の収納凹所に対する干渉が防止され、たわみ代が十分に確保される。
【0022】
【発明の実施の形態】
以下、この発明の実施の形態を添付図面に基づいて説明する。図1から図5に示すように、実施形態の一方向クラッチの構成は、クラッチばね2の構成以外は、前述の従来の場合と同じ構成であるので、同一部分には同一符号を付して示すにとどめ、重複した説明を省略する。以下クラッチばね2について説明する。
【0023】
クラッチばね2は、基本的には従来のものと同様に、環部11と、各ポケット10の数、即ちローラ3の数に対応した数のばね片9とにより構成される(図1参照)。このクラッチばね2は、図5に示すように、1枚の弾力性のある金属板を打抜いて形成されるものであり、環部11は外輪1の内径とほぼ等しい内径を有し、その環部11の外周部に周方向に等間隔をおいてばね片9を立上げるための基部12が設けられる。
【0024】
基部12にはばね片9の立上げ折り曲げ線13が設けられる。この立上げ折り曲げ線13の位置が従来の場合と相違している。即ち、環部11の中心点Oのまわりを角度αでローラ3の数に等しい数で7等分した等角度間隔の半径線を基準位置A(図5(b)参照)として、基部12側に一定距離aだけオフセットした位置A’上に前記の立上げ折り曲げ線13を設定する。その折り曲げ線13と内径との間に、隣接する他の基部12との連結部14が設けられる。
【0025】
各ばね片9の長さは従来と同様にLであり、上記の立上げ折り曲げ線13に対して直角方向に、かつ隣接する基部12の斜辺15に沿って延び出しており、環部11のまわりに相互に一定の角度β(=α)をもって羽根車状に突き出している。
【0026】
この実施形態の場合は、前記のように基部12側に一定量aだけオフセットしているために、材料の打ち抜きは半径R’(<R、Rは従来例の図4参照)である。
【0027】
各ばね片9の中間部分には、前記の立上げ折り曲げ線13と平行の中間折り曲げ線16が設けられ、前記折り曲げ線13によって基部12から直角に立上げられると共に、中間折り曲げ線16によって基部12側に折り返される(図5(c)参照)。この折り返し角γはローラ3に付与する付勢力を考慮して適当に設定される。
【0028】
上記構成のばね2は外輪1の一方の端面から各ばね片9を各ポケット10に挿入去れると共に、環部11をその外輪1の端面に当てる(図4参照)。
【0029】
上記のばね2を装着したのち、外輪1の反対側の端面からローラ3の先端を該ばね片9の折り曲げ部の先端を押し当てながら挿入し、最終的にばね片9の先端部をローラ3の長手方向の中間部に押し当てる。
【0030】
上記のようにしてローラ3に押し当てられたばね片9の先端部分の状態を、従来の場合と対比して図6に基づいて説明する。
【0031】
同図(a)は従来例の場合である。各ばね片9は7等分した等角度半径線上に立上げ折り曲げ線13を設定して折り曲げ、更に中間折り曲げ線16において折り返し、その先端部をローラ3に押し当てている。前述のように、ばね片9の先端部はローラ3に対しエッジ角δをもったエッジ当たりとなる。
【0032】
同図(b)は、図(a)の状態においてローラ3(又はこれと一体の外輪1)を固定して、立上げ折り曲げ線13の位置を、図(a)の立上げ折り曲げ線13の位置を基準位置Aとして基部12側へ一定量aだけオフセットした位置に設定した状態を示す。上記のオフセットの結果、ばね片9の先端部がローラ3から角度δ’だけ離れた状態となる。実際はばね片9がローラ3から離れるようなクラッチばね2の装着状態は存在しないが、理解の便宜のためにこのような状態を仮想するのである。
【0033】
同図(c)は、図(b)の状態から角度δ’だけクラッチばね2をローラ3(又はこれと一体の外輪1)に対して回転させ、ばね片9の先端をたわみ代m’をもってローラ3に当接させた状態であり、この実施形態の場合である。この場合は、先端部の中心がローラ3に対して当接し、前記のエッジ角δがゼロ又は実質ゼロとなりエッジ当たりが無くなる。
【0034】
また、図7に示すように、ばね収納凹所8の奥行き方向Y1 と、ばね片9の長さ方向Y2 の角度はゼロ又はそれに近い大きさとなる。このため、ばね片9のばね収納凹所8に対する干渉は回避され、大きなたわみ代m’(>m)が得られる。
【0035】
上記のオフセットの量aは、ローラ3の数、直径等を考慮して決定されるが、この量aが小さすぎると、エッジ当たりが解消できず、また大き過ぎると反対側でエッジ当たりが生じる。要は、クラッチばね2をローラ3に対して回転させ得る余裕としての角度δ’の大きさが、エッジ角δが消失するに足りる大きさであればよい。言い換えれば、オフセットの量aの大きさは、ばね片9を上記基準位置Aで立上げたとした場合の該ばね片9のローラ3に対するエッジ角δがゼロ又は実質ゼロになるように、上記クラッチばね2を上記外輪1に対し相対回転させるに足りる大きさに設定される。
【0036】
なお、前述のオフセットは、基準位置Aから平行移動する場合だけでなく、位置A’が基準位置Aに対して±5°程度傾くことは許容範囲である。
【0037】
以上の構成でなる一方向クラッチの作用も、従来例の場合と同様である。
【0038】
図8は他の実施形態におけるクラッチばね2の打ち抜き時の平面図であり、ばね片9の数がローラ3の数に合わせて5枚にしたものである。その他の構成は前述の場合と同じである。
【0039】
【発明の効果】
上記のように、この発明の一方向クラッチは、クラッチばねのばね片の立上げ折り曲げ線の位置を、ローラの数に等分された等角度間隔の半径線を基準として、当該ばね片の基部側に所定量オフセットした位置に設定したことにより、ばね片の先端部がローラに対してエッジ当たりすることが避けられ、ローラをポケット内部の傾斜面に正しく押圧できる。また、ばね片がばね収納凹所の干渉することも避けられるので、ばね片のたわみ代を十分に大きくとることができる。
【0040】
また、上記のオフセット分だけ材料の打ち抜き径が小さくなるので、材料の有効利用を図ることができる。更に、上記のばね片の先端部をローラの長手方向の中間部に当接させることにより、ローラの傾きが防止され、ポケットの傾斜面に対しローラを正しい姿勢で押圧させることができる。
【図面の簡単な説明】
【図1】実施形態の分解斜視図
【図2】同上の断面図
【図3】同上の一部拡大断面図
【図4】図3のIV−IV線の断面図
【図5】(a)クラッチばねの打ち抜き時の平面図
(b)同上の一部拡大平面図
(c)同上のばね片の折り返し状態の側面図
【図6】(a)〜(c)クラッチばねとローラとの位置関係説明図
【図7】同上の一部拡大断面図
【図8】他の実施形態におけるクラッチばねの打ち抜き時の平面図
【図9】従来例の分解斜視図
【図10】同上の断面図
【図11】同上の一部拡大断面図
【図12】図11のX−X線の断面図
【図13】同上の一部拡大断面図
【図14】(a)クラッチばねの打ち抜き時の平面図
(b)同上のばね片の折り返し状態の側面図
【符号の説明】
1 外輪
2 ばね
3 ローラ
4 蓋
5 外装部材
6 軸
7 くさび空所
8 凹所
9 ばね片
10 ポケット
11 環部
12 基部
13 立上げ折り曲げ線
14 連結部
15 斜辺
16 中間折り曲げ線
17 筒部
18 閉塞端面
19 嵌合溝
21 リブ
22 係合リブ
23 係合溝
24、25 軸穴
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a one-way clutch suitable for office machines such as fax machines and copying machines, and more particularly to a metal spring piece.
[0002]
[Prior art]
As this type of one-way clutch, the inventors previously filed a patent application in Japanese Patent Application No. 7-252511 (Japanese Patent Laid-Open No. 9-89011). In the one-way clutch according to this patent application, as shown in FIGS. 9 to 14, pockets 10 are provided on the inner peripheral surface of the outer ring 1 at regular intervals, and a roller 3 is inserted into the pocket 10. An inclined surface in which the gap narrows in one direction of rotation is formed on the bottom surface of each of the pockets 10 (see angle θ in FIG. 11), and the spring housing recess 8 is formed on the inside of each pocket 10 on the opposite side of the inclined surface of the inclined surface. Is provided. The metal spring piece 9 is housed in the spring housing recess 8, and the roller 3 is urged by the spring piece 9 and pressed against the inclined surface. Both end surfaces of the pocket 10 of the outer ring 1 are closed by the lid member 4 and the outer body 5.
[0003]
The opening width W (see FIG. 11) of the pocket 10 is formed smaller than the diameter of the roller 3, and a part of the roller 3 is partially exposed from the opening and contacts the shaft 6.
[0004]
The lid 4 may be fitted to the outer ring 1 by some means, but in the illustrated case, the lid 4 is fitted to the exterior member 5. That is, the outer ring 1 is covered with the cylindrical portion 17 of the outer member 5, one end surface of the outer ring 1 is closed with the closed end surface 18 of the outer member 5, and the fitting groove 19 formed on the inner peripheral surface of the end portion of the cylindrical portion 17. It is attached by fitting the rib 21 on the outer peripheral surface of the lid 4.
[0005]
An engagement rib 22 is formed in the axial direction on the inner peripheral surface of the cylindrical portion 17 of the outer member 5, and the outer ring 1 and the outer member 5 are engaged with each other by engaging with the engagement groove 23 on the outer peripheral surface of the outer ring 1. I try to prevent the rotation. The lid 4 and the exterior member 5 are provided with shaft holes 24 and 25, respectively.
[0006]
In order to close one end of the pocket 10 of the outer ring 1, the closed end face 18 is formed on the exterior member 5 in the above case, but it may be closed with an independent lid, or the pocket 10 of the outer ring 1 itself. An obstructing wall may be formed. Further, the cylindrical portion 17 and the lid 4 are integrated, and an independent lid that is fitted to the cylindrical portion 17 or the outer ring 1 is used in place of the closed end face 18, or a closed wall is formed in the pocket 10 itself of the outer ring 1. A configuration may be adopted.
[0007]
The one-way clutch configured as described above is used by inserting the shaft 6 on the inner diameter side of the outer ring 1, and forms a wedge-shaped cavity 7 between the inclined surface of the pocket 10 and the shaft 6. In a normal state, the roller 3 is urged by the spring piece 9 toward the narrow side of the wedge-shaped space 7 and pressed against the inclined surface. When the shaft 6 rotates in the biasing direction (see the arrow in FIG. 10), the shaft 6 is locked and the torque of the shaft 6 is transmitted to the outer ring 1 and the exterior body 5 integrated therewith. When the shaft 6 rotates in the reverse direction, the roller 3 moves to the wider side of the wedge-shaped cavity 7 while compressing the spring piece 9, so that the lock is released and the shaft 6 rotates idle.
[0008]
By the way, each metal spring piece 9 has a base portion 12 integrated with a metal ring portion 11, thereby constituting one clutch spring 2. The clutch spring 2 is formed by punching one elastic metal plate, and FIG. 14 shows the punched state. The length of the spring piece 9 is indicated by L, and the punching radius of the material is indicated by R.
[0009]
The ring portion 11 has an inner diameter that is substantially equal to the inner diameter of the outer ring 1, and is arranged at equal intervals in the circumferential direction on the outer peripheral portion of the ring portion 11. A base 12 is provided.
[0010]
In each base portion 12, a rising and bending line 13 of the spring piece 9 is provided on a radial line having an equal angular interval obtained by dividing the circumference of the center point O of the ring portion 11 by an angle α by the number of the rollers 3. A connecting portion 14 with another adjacent base portion 12 is provided between the raised fold line 13 and the inner diameter.
[0011]
The spring pieces 9 extend in a direction perpendicular to the above-described rising fold line 13 and along the hypotenuse 15 of the adjacent base portion 12, and the spring pieces 9 are arranged at a certain angle around the ring portion 11 with respect to each other. It protrudes like an impeller with β (= α).
[0012]
An intermediate fold line 16 that is parallel to the rising fold line 13 is provided at an intermediate portion of each spring piece 9 and is raised from the base 12 by the rising fold line 13 at a right angle. 16 is folded back toward the base 12 (see FIG. 14B), and the folded tip is pressed against the roller 3 (see FIG. 12).
[0013]
[Problems to be solved by the invention]
In the one-way clutch configured as described above, depending on the angle of the inclined surface of the pocket 10 and the diameter of the roller 3, the tip of the spring piece 9 with respect to the roller 3 comes into contact with the edge at point B as shown in FIG. Sometimes. The edge angle in this case is denoted by δ.
[0014]
Further, an angle ε is generated between the depth direction Y 1 of the spring housing recess 8 and the length direction Y 2 of the spring piece 9, and the spring piece 9 interferes at a point C on the inner wall of the housing recess 8. There is. When such interference occurs, the deflection allowance m in which the spring piece 9 is compressed is limited.
[0015]
If the spring piece 9 comes into contact with the edge as described above or interferes with the spring housing recess 8, the roller 3 cannot be correctly pressed against the inclined surface of the pocket 10 of the outer ring 1, and the deflection of the spring piece 9 The allowance m becomes small and an appropriate spring load cannot be exhibited.
[0016]
Accordingly, an object of the present invention is to improve the clutch performance by preventing the edge of the spring piece from hitting the edge so that the roller can be correctly pressed against the inclined surface, and allowing the deflection of the spring piece to be sufficiently large. To do.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the one-way clutch of the present invention is provided with pockets at regular intervals on the inner peripheral surface of the outer ring, a roller is inserted into the pocket, and the bottom surface of the pocket is rotated in one direction. An inclined surface with a narrow gap is formed, a spring that biases the roller in the direction of the inclination is housed in each pocket, both end surfaces of the pocket of the outer ring are closed with lid members, and an inner peripheral surface of the outer ring of the pocket A metal ring in which the opening width on the side is formed to be smaller than the diameter of the roller, and the spring is provided with metal spring pieces at regular intervals corresponding to each pocket, and one end of each spring piece is integrally joined. A base portion of each spring piece is formed on the outer peripheral portion of the ring portion of the spring, the spring piece is bent from one end of the base portion, and the spring piece is raised. Fold line to the number of rollers The radial line of minutes has been equal angular intervals as the reference position, and a configuration set at a position a predetermined amount offset at the base side of the spring piece.
[0018]
Further, the tip of the spring piece is pressed against an intermediate part in the longitudinal direction of the roller, or the spring piece and the ring part are formed by punching a single metal plate, and the spring piece is bent and the It is possible to adopt a configuration that is raised with respect to the ring portion.
[0019]
[Action]
The one-way clutch is used for use by inserting a shaft on the inner diameter side of the outer ring and fitting an exterior body on the outer diameter surface of the outer ring. Under normal conditions, the roller is biased in the narrow direction of a wedge-shaped cavity formed between the inclined surface of the pocket and the shaft. When the shaft rotates in the urging direction, the shaft is locked and torque of the shaft is transmitted to the outer ring and the exterior body integrated therewith.
[0020]
When the shaft rotates in the reverse direction, the roller moves to the wider side of the wedge-shaped cavity while compressing the spring, so that the lock is released and the shaft rotates idly.
[0021]
Since the rising fold line of the spring piece is offset from the reference position as described above, the edge of the spring piece against the roller is prevented, and the roller is pressed against the inclined surface of the pocket in a correct posture. In addition, since the angle between the depth direction of the spring storage recess and the length direction of the spring piece is zero or small, interference with the storage recess of the spring piece is prevented, and a sufficient allowance is secured. .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 5, the configuration of the one-way clutch in the embodiment is the same as that of the conventional case except for the configuration of the clutch spring 2. For the sake of illustration only, a duplicate description is omitted. Hereinafter, the clutch spring 2 will be described.
[0023]
The clutch spring 2 is basically composed of an annular portion 11 and a number of spring pieces 9 corresponding to the number of pockets 10, that is, the number of rollers 3, as in the conventional one (see FIG. 1). . As shown in FIG. 5, the clutch spring 2 is formed by punching out one elastic metal plate, and the ring portion 11 has an inner diameter substantially equal to the inner diameter of the outer ring 1. A base portion 12 for raising the spring pieces 9 is provided on the outer peripheral portion of the ring portion 11 at equal intervals in the circumferential direction.
[0024]
The base 12 is provided with a rising fold line 13 of the spring piece 9. The position of the rising fold line 13 is different from the conventional case. That is, the base 12 side is defined as a reference position A (see FIG. 5B) with a radius line of equal angular intervals obtained by dividing the circumference of the center point O of the ring portion 11 into seven equal parts with an angle α equal to the number of the rollers 3. The rising fold line 13 is set on a position A ′ offset by a predetermined distance a. A connecting portion 14 with another adjacent base portion 12 is provided between the fold line 13 and the inner diameter.
[0025]
The length of each spring piece 9 is L as in the conventional case, and extends in a direction perpendicular to the above-described rising and bending line 13 and along the hypotenuse 15 of the adjacent base portion 12. Projecting in the shape of an impeller at a constant angle β (= α).
[0026]
In the case of this embodiment, as described above, the material is stamped out by a radius R ′ (<R and R refer to FIG. 4 of the conventional example) because it is offset by a certain amount a toward the base 12 side.
[0027]
An intermediate fold line 16 parallel to the rising fold line 13 is provided at an intermediate portion of each spring piece 9. The intermediate fold line 16 is raised at a right angle from the base 12. Folded to the side (see FIG. 5C). The turning angle γ is appropriately set in consideration of the urging force applied to the roller 3.
[0028]
In the spring 2 having the above-described configuration, each spring piece 9 is inserted into and removed from each pocket 10 from one end face of the outer ring 1, and the ring portion 11 is applied to the end face of the outer ring 1 (see FIG. 4).
[0029]
After mounting the spring 2, the tip of the roller 3 is inserted from the opposite end face of the outer ring 1 while pressing the tip of the bent portion of the spring piece 9. Finally, the tip of the spring piece 9 is inserted into the roller 3. Press against the middle part in the longitudinal direction.
[0030]
The state of the tip portion of the spring piece 9 pressed against the roller 3 as described above will be described based on FIG. 6 in comparison with the conventional case.
[0031]
FIG. 4A shows the case of the conventional example. Each spring piece 9 is bent by setting up a rising fold line 13 on an equiangular radius line divided into seven equal parts, and further folded back at an intermediate fold line 16, and its tip is pressed against the roller 3. As described above, the tip of the spring piece 9 is in contact with the edge having an edge angle δ with respect to the roller 3.
[0032]
FIG. 6B shows the position of the rising fold line 13 with the roller 3 (or the outer ring 1 integrated therewith) fixed in the state of FIG. A state in which the position is set as a reference position A and set to a position offset by a certain amount a toward the base 12 side is shown. As a result of the above offset, the tip of the spring piece 9 is separated from the roller 3 by an angle δ ′. In fact the mounted state of the clutches spring 2 as spring pieces 9 away from the roller 3 does not exist, it is to virtual this state for ease of understanding.
[0033]
FIG. 6C shows that the clutch spring 2 is rotated with respect to the roller 3 (or the outer ring 1 integral therewith) by an angle δ ′ from the state of FIG. In this embodiment, the roller 3 is in contact with the roller 3. In this case, the center of the tip portion comes into contact with the roller 3, and the edge angle δ becomes zero or substantially zero, so that there is no edge contact.
[0034]
Further, as shown in FIG. 7, the angle between the depth direction Y 1 of the spring housing recess 8 and the length direction Y 2 of the spring piece 9 is zero or close to it. For this reason, interference with the spring accommodating recess 8 of the spring piece 9 is avoided, and a large deflection allowance m ′ (> m) is obtained.
[0035]
The offset amount a is determined in consideration of the number of rollers 3, the diameter, and the like. If the amount a is too small, edge contact cannot be eliminated, and if it is too large, edge contact occurs on the opposite side. . In short, it is sufficient that the angle δ ′ as a margin for rotating the clutch spring 2 with respect to the roller 3 is large enough to eliminate the edge angle δ. In other words, the magnitude of the offset amount a is set so that the edge angle δ of the spring piece 9 with respect to the roller 3 when the spring piece 9 is raised at the reference position A is zero or substantially zero. The spring 2 is set to a size sufficient to rotate relative to the outer ring 1.
[0036]
Note that the above-described offset is an allowable range not only when the reference A is translated from the reference position A but also when the position A ′ is inclined by about ± 5 ° with respect to the reference position A.
[0037]
The operation of the one-way clutch configured as described above is the same as that in the conventional example.
[0038]
FIG. 8 is a plan view at the time of punching of the clutch spring 2 in another embodiment, in which the number of spring pieces 9 is five according to the number of rollers 3. Other configurations are the same as those described above.
[0039]
【The invention's effect】
As described above, the one-way clutch according to the present invention is configured such that the position of the rising fold line of the spring piece of the clutch spring is based on the radial lines equally divided by the number of rollers, and the base portion of the spring piece. By setting the position offset by a predetermined amount on the side, the tip of the spring piece can be prevented from hitting the edge of the roller, and the roller can be correctly pressed against the inclined surface inside the pocket. Further, since the spring piece can be prevented from interfering with the spring housing recess, the deflection of the spring piece can be made sufficiently large.
[0040]
Moreover, since the punching diameter of the material is reduced by the offset, the material can be effectively used. Further, by bringing the tip of the spring piece into contact with the intermediate portion in the longitudinal direction of the roller, the roller is prevented from being inclined, and the roller can be pressed in a correct posture against the inclined surface of the pocket.
[Brief description of the drawings]
1 is an exploded perspective view of the embodiment. FIG. 2 is a cross-sectional view of the same. FIG. 3 is a partially enlarged cross-sectional view of the same. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. (B) Partially enlarged plan view of the above (c) Side view of the folded back spring piece (FIG. 6) (a) to (c) Positional relationship between the clutch spring and the roller FIG. 7 is a partially enlarged cross-sectional view of the same. FIG. 8 is a plan view of the clutch spring in another embodiment. FIG. 9 is an exploded perspective view of a conventional example. FIG. 10 is a cross-sectional view of the same. 11] Partial enlarged sectional view of the same. [FIG. 12] Cross sectional view taken along line XX of FIG. 11. [FIG. 13] Partial enlarged sectional view of the same. [FIG. 14] (a) Plan view when the clutch spring is punched out. b) Side view of folded spring piece as above [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer ring 2 Spring 3 Roller 4 Cover 5 Exterior member 6 Shaft 7 Wedge cavity 8 Recess 9 Spring piece 10 Pocket 11 Ring part 12 Base part 13 Folding line 14 Connection part 15 Oblique side 16 Intermediate bending line 17 Cylindrical part 18 Closed end surface 19 Fitting groove 21 Rib 22 Engaging rib 23 Engaging groove 24, 25 Shaft hole

Claims (2)

外輪(1)の内周面に一定間隔をおいてポケット(10)を設け、そのポケット(10)にローラ(3)を挿入し、上記ポケット(10)の底面に回転の一方向に間隙が狭くなる傾斜面を形成し、上記ローラ(3)をその傾斜の方向に付勢するクラッチばね(2)を各ポケット(10)に収納し、上記外輪(1)のポケット(10)の両端面を蓋部材で閉塞し、上記ポケット(10)の外輪(1)内周面側の開口幅を上記ローラ(3)の直径より小さく形成し、上記クラッチばね(2)を各ポケット(10)に対応して設けられた一定間隔の金属製のばね片(9)と、各ばね片(9)の一端を一体に結合した金属製の環部(11)とにより形成してなる一方向クラッチにおいて、
上記クラッチばね(2)は1枚の弾力性のある金属板を打抜いて形成され、
その打抜いた状態において、上記クラッチばね(2)の環部(11)の外周部に周方向に等間隔をおいて各ばね片(9)の基部(12)形成され各ばね片(9)は立上げ折り曲げ線(13)に対して直角方向に、かつ隣接する基部(12)の斜辺(15)に沿って延び出し、該ばね片(9)は環部(11)のまわりに相互に一定の角度(β)をもって羽根車状に突き出し、
該ばね片(9)の立上げ折り曲げ線(13)各基部(12)の一端において上記ローラ(3)の数に等分された等角度間隔の半径線(A)を基準位置として、当該ばね片(9)の基部(12)側にその基部(12)の範囲内において所定量(a)オフセットした位置に設定され、
各基部(12)の一端から上記ばね片(9)を折り曲げて立上げたことを特徴とする一方向クラッチ。
A pocket (10) is provided at a constant interval on the inner peripheral surface of the outer ring (1), a roller (3) is inserted into the pocket (10), and there is a gap in one direction of rotation on the bottom surface of the pocket (10). Clutch springs (2) that form inclined surfaces that narrow and bias the roller (3) in the direction of the inclination are housed in the pockets (10), and both end surfaces of the pocket (10) of the outer ring (1). Is closed with a lid member, and the opening width of the inner periphery of the outer ring (1) of the pocket (10) is made smaller than the diameter of the roller (3), and the clutch spring (2) is placed in each pocket (10). In a one-way clutch formed by a metal spring piece (9) of a constant interval provided correspondingly and a metal ring part (11) integrally joined to one end of each spring piece (9) ,
The clutch spring (2) is formed by punching one elastic metal plate,
In the punched state, the base portion of the clutch spring (2) ring portion (11) each spring piece at equal intervals on the outer peripheral portion in the circumferential direction of the (9) (12) is formed, the spring piece ( 9) extends perpendicularly to the rising fold line (13) and extends along the hypotenuse (15) of the adjacent base (12), and the spring piece (9) extends around the ring (11). Protruding into an impeller shape with a constant angle (β) to each other,
The rising and bending line (13) of the spring piece (9) has a radial line (A) at equal angular intervals equally divided into the number of the rollers (3) at one end of each base (12) as a reference position. The spring piece (9) is set at a position offset by a predetermined amount (a) within the range of the base (12) on the base (12) side,
A one-way clutch characterized in that the spring piece (9) is bent up from one end of each base portion (12).
上記ばね片(9)の先端部を上記ローラ(3)の長手方向の中間部に押し当てたことを特徴とする請求項1に記載の一方向クラッチ。  The one-way clutch according to claim 1, wherein the tip of the spring piece (9) is pressed against the intermediate portion in the longitudinal direction of the roller (3).
JP33996299A 1999-11-30 1999-11-30 One-way clutch Expired - Lifetime JP4285864B2 (en)

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DE102005034038A1 (en) * 2005-07-21 2007-02-01 Schaeffler Kg Sleeve / roller freewheel with solid outer ring
DE102005034039A1 (en) * 2005-07-21 2007-01-25 Schaeffler Kg One-way roller clutch with inner and outer ring, comprises integrated segments bent in order to form cage
JP4627770B2 (en) * 2007-06-15 2011-02-09 芦森工業株式会社 Belt fastener
JP6231807B2 (en) * 2013-08-08 2017-11-15 濱中ナット株式会社 Bolt locking structure
CN108757724A (en) * 2018-08-18 2018-11-06 苏州金诚轴承有限公司 A kind of unilateral bearing that mounted and high-speed uses

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