JPH0979293A - Overload protecting mechanism - Google Patents
Overload protecting mechanismInfo
- Publication number
- JPH0979293A JPH0979293A JP23856795A JP23856795A JPH0979293A JP H0979293 A JPH0979293 A JP H0979293A JP 23856795 A JP23856795 A JP 23856795A JP 23856795 A JP23856795 A JP 23856795A JP H0979293 A JPH0979293 A JP H0979293A
- Authority
- JP
- Japan
- Prior art keywords
- key groove
- transmission shaft
- engaging member
- engagement
- overload protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/04—Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type
- F16D7/048—Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type with parts moving radially between engagement and disengagement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、伝動軸と前記伝動
軸に取り付けられた回転体との間に設けられる過負荷保
護機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overload protection mechanism provided between a transmission shaft and a rotating body attached to the transmission shaft.
【０００２】[0002]
【従来の技術】スプロケットや歯車等の回転体と、前記
回転体が取り付けられる伝動軸との間に設けられる従来
の過負荷保護装置は、図８に示すように、伝動軸２１に
取り付けられているハブ２２に、外周部に回転体２３が
固定されているセンターフランジ２４が嵌挿されてお
り、前記センターフランジ２４は、ハブ２２に形成され
ているフランジ部２２Ａと前記ハブ２２に嵌挿されてい
る押圧プレート２５との間に回転可能に保持されてい
る。センターフランジ２４には、ボール２６が収容され
る貫通孔２４Ａが形成されており、前記ボール２６は、
皿バネ２７によって付勢されている押圧プレート２５に
よって、ハブ２２のフランジ部２２Ａに形成されている
凹部２２Ｂに係合されている。2. Description of the Related Art A conventional overload protection device provided between a rotating body such as a sprocket and a gear and a transmission shaft on which the rotating body is mounted is mounted on a transmission shaft 21 as shown in FIG. A center flange 24 having a rotating body 23 fixed to the outer peripheral portion is fitted and inserted into the hub 22 that is present. The center flange 24 is fitted and inserted into the flange portion 22A formed on the hub 22 and the hub 22. It is rotatably held between it and the pressing plate 25. The center flange 24 is formed with a through hole 24A for accommodating the ball 26, and the ball 26 is
The pressing plate 25 biased by the disc spring 27 engages with the recess 22B formed in the flange portion 22A of the hub 22.
【０００３】前記構成の過負荷保護装置は、スプロケッ
ト２３と伝動軸２１との間に過大なトルクが作用する
と、ボール２６が皿バネ２７の付勢力に抗して押圧プレ
ート２５を押して凹部２２Ｂから脱出し、センターフラ
ンジ２４はハブ２２に対してスリップして、過負荷が防
止される構造になっている。In the overload protection device having the above-mentioned structure, when an excessive torque acts between the sprocket 23 and the transmission shaft 21, the ball 26 pushes the pressing plate 25 against the biasing force of the disc spring 27 and the recessed portion 22B. The center flange 24 escapes and slips with respect to the hub 22 to prevent overload.
【０００４】[0004]
【発明が解決しようとする課題】前述した構造の従来の
過負荷防止装置は、センタープレートやボール、押圧プ
レート、皿バネ等の部品がハブの周囲に配置されている
ため、取り付けスペースを必要とし、特に、既存の機械
装置内に配置されている伝動軸とこれに固定されている
回転体との間に後から組み込もうとした場合には、前記
スペースは機械装置の設計時にあらかじめ考慮されてい
ないので、組み込みが困難であったり不可能となる問題
があった。また、過負荷防止装置が伝動軸に取り付けら
れている場合、後で過負荷防止装置が必要無くなった時
に、これを取り外すと、回転体がハブのフランジ部に取
り付けられている構造となっているため、前記回転体の
代わりに、伝動軸に直接取り付けることのできる別の回
転体が必要となる問題があった。The conventional overload preventing device having the above-mentioned structure requires a mounting space because parts such as the center plate, the ball, the pressing plate, and the disc spring are arranged around the hub. , In particular when attempting to retrofit between a transmission shaft arranged in an existing machine and a rotating body fixed thereto, the space is taken into account in the design of the machine. Since it is not installed, there is a problem that it is difficult or impossible to install. Also, when the overload prevention device is attached to the transmission shaft, the rotating body is attached to the flange portion of the hub by removing the overload prevention device when it is no longer necessary. Therefore, there is a problem that another rotating body that can be directly attached to the transmission shaft is required instead of the rotating body.
【０００５】そこで、本発明は前述したような従来技術
における問題を解消し、構造が簡単で既設の機械装置に
対しても組み込みや取り外しが容易にできる過負荷保護
機構を提供することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems in the prior art and to provide an overload protection mechanism having a simple structure which can be easily incorporated into and removed from an existing mechanical device. To do.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するた
め、本発明の過負荷保護機構は、外周面に第１のキー溝
が形成された伝動軸と、前記伝動軸が嵌合される軸孔の
内周面に前記第１のキー溝と対向した第２のキー溝が形
成された回転体と、前記第１のキー溝と第２のキー溝の
何れか一方に収容される第１の係合部材と、他方に収容
される第２の係合部材と、前記第１のキー溝と第２のキ
ー溝の少なくとも一方に収容され、前記第１の係合部材
と第２の係合部材とを互いに係合状態を保持するように
付勢する弾性体とを備えたものである。そして、前記第
１の係合部材と第２の係合部材とは、前記伝動軸と回転
体との間の伝達トルクが所定の大きさ以上となった場合
に、相互の係合状態が解放される形状の係合面を有して
いる。In order to achieve the above object, the overload protection mechanism of the present invention has a transmission shaft having a first key groove formed on the outer peripheral surface thereof and a shaft to which the transmission shaft is fitted. A rotating body having a second key groove formed on an inner peripheral surface of the hole, the second key groove facing the first key groove, and a first body housed in one of the first key groove and the second key groove. Engaging member, a second engaging member accommodated in the other, and an engaging member accommodated in at least one of the first key groove and the second key groove, the first engaging member and the second engaging member. And an elastic body for urging the coupling member and the coupling member to maintain the engaged state with each other. Then, the first engagement member and the second engagement member are released from the engagement state when the transmission torque between the transmission shaft and the rotating body becomes equal to or larger than a predetermined magnitude. It has an engagement surface of a shape.
【０００７】前記第１のキー溝と第２のキー溝はそれぞ
れ伝動軸と回転体の複数箇所に形成することができる。
その場合、前記伝動軸の中心に対して回転対称とならな
い構造として、伝動軸と回転体とが過負荷トルクが作用
した際に、１回転分スリップするまでは、すべての第１
の係合部材と第２の係合部材とが再係合しないように構
成することができる。The first key groove and the second key groove can be formed at a plurality of positions on the transmission shaft and the rotating body, respectively.
In that case, as a structure that is not rotationally symmetrical with respect to the center of the transmission shaft, all the first shafts are slipped until one slip occurs when the transmission shaft and the rotor are subjected to overload torque.
The engaging member and the second engaging member may not be re-engaged.
【０００８】[0008]
【作用】本発明の過負荷保護機構は、キーによって相互
に固定されている伝動軸と回転体との間に組み込んで使
用することができる。そして、過負荷保護機構の組み込
みは、回転体を伝動軸に固定していたキーを取り除き、
伝動軸の外周面に設けられている第１のキー溝と、回転
体の軸孔の内周面に設けられている第２のキー溝の内周
面との何れか一方に第１の係合部材を収容し、また、他
方に第２の係合部材を収容し、また、前記第１と第２の
キー溝の少なくとも一方には、弾性体を収容して、両方
の係合部材どうしが前記弾性体の付勢力で係合状態とな
るようにして行う。The overload protection mechanism of the present invention can be used by incorporating it between the transmission shaft and the rotating body which are fixed to each other by the key. And the incorporation of the overload protection mechanism removes the key that fixed the rotating body to the transmission shaft,
The first key groove provided on the outer peripheral surface of the transmission shaft and the first key groove provided on the inner peripheral surface of the shaft hole of the rotating body are provided with the first engagement groove. The engaging member is housed in the other, the second engaging member is housed in the other, and the elastic body is housed in at least one of the first and second keyways, so that the two engaging members are kept together. Is brought into an engaged state by the urging force of the elastic body.
【０００９】前記のようにして、伝動軸と回転体との間
に組み込まれた過負荷保護機構は、常時は、第１の係合
部材と第２の係合部材とが係合されて伝動軸と回転体と
の間でトルク伝達が行われている。そして、伝達トルク
が、所定の値を超えて伝動軸と回転体との間に作用する
と、第１の係合部材の係合面と第２の係合部材の係合面
との間に滑りが生じて係合状態が解放され、過負荷状態
となることが回避される。As described above, in the overload protection mechanism incorporated between the transmission shaft and the rotating body, the first engagement member and the second engagement member are normally engaged to transmit the power. Torque is transmitted between the shaft and the rotating body. When the transmission torque exceeds a predetermined value and acts between the transmission shaft and the rotating body, slippage occurs between the engagement surface of the first engagement member and the engagement surface of the second engagement member. Occurs, the engagement state is released, and an overload state is avoided.
【００１０】前記第１のキー溝と第２のキー溝は、それ
ぞれ伝動軸と回転体の複数箇所に形成することによっ
て、伝達トルクを大きくすることができる。その際、伝
動軸の中心に対して回転対称でない構造を有する場合に
は、過負荷トルクが作用して、第１の係合部材と第２の
係合部材との間の係合状態が解放された後、伝動軸に対
して回転体が１回転分スリップして、元の係合位置に戻
らない限りは、途中の回転位置で第１の係合部材と第２
の係合部材とが一部係合状態となっても、全てが係合状
態とならず、１回転スリップした位置で全ての第１の係
合部材と第２の係合部材とが完全に係合可能な状態とな
る。The transmission torque can be increased by forming the first key groove and the second key groove at a plurality of positions on the transmission shaft and the rotating body, respectively. At that time, when the structure has no rotational symmetry with respect to the center of the transmission shaft, the overload torque acts and the engagement state between the first engagement member and the second engagement member is released. After that, unless the rotating body slips one rotation with respect to the transmission shaft and returns to the original engaging position, the first engaging member and the second engaging member are not rotated at the intermediate rotating position.
Even if a part of the first engaging member and the second engaging member are in an engaged state, all of them are not in an engaged state, and all the first engaging members and the second engaging members are completely in a position where one rotation slips. Engageable state.
【００１１】[0011]
【実施例】以下、図面に基づいて、本発明の実施例につ
いて説明する。図１は、本発明の過負荷保護機構の１実
施例を示すものであって、過負荷保護機構１は、伝動軸
２の端部に形成されている第１のキー溝３と、回転体と
してのスプロケット４のボス５の軸孔６に形成されてい
る、前記第１のキー溝３と略同一幅の第２のキー溝７と
の間に、第１の係合部材８、第２の係合部材９、及び、
弾性体１０が組み込まれて構成されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows one embodiment of an overload protection mechanism of the present invention. The overload protection mechanism 1 includes a first key groove 3 formed at an end of a transmission shaft 2 and a rotary body. The first engaging member 8 and the second engaging member 8 are formed in the shaft hole 6 of the boss 5 of the sprocket 4 between the first key groove 3 and the second key groove 7 having substantially the same width. Engaging member 9 of
The elastic body 10 is incorporated and configured.
【００１２】図２は、図１のＡ−Ａ線位置の拡大部分断
面図であって、第１の係合部材８は、第１のキー溝３に
適合した断面形状を有しており、第１のキー溝３内に嵌
入され、伝動軸２の外周面には突出していない形状にな
っている。また、第１の係合部材８の上面には、断面逆
台形状の凹部からなる凹状係合面１１が形成されてい
る。FIG. 2 is an enlarged partial sectional view taken along the line AA in FIG. 1, in which the first engaging member 8 has a sectional shape adapted to the first keyway 3. It has a shape that is fitted into the first key groove 3 and does not project to the outer peripheral surface of the transmission shaft 2. Further, on the upper surface of the first engaging member 8, a concave engaging surface 11 formed of a concave portion having an inverted trapezoidal cross section is formed.
【００１３】また、第２の係合部材９は、第２のキー溝
７内を半径方向に移動可能な形状に形成されており、そ
の下面側は、前記第１の係合部材８の凹状係合面１１に
係合する逆台形状の凸状係合面１２となっている。さら
に、第２のキー溝７の奥側には、第２の係合部材９の上
面に当接して、第２の係合部材９を第１の係合部材８側
へ押圧付勢する弾性体１０が収容されている。本実施例
の場合には、図３に示すように、第１の係合部材８、第
２の係合部材９、弾性体１０は、第１のキー溝３及び第
２のキー溝７の長手方向に細長く形成されており、弾性
体１０には、波状の板バネが用いられている。The second engaging member 9 is formed in a shape that can move in the second key groove 7 in the radial direction, and the lower surface side thereof is a concave shape of the first engaging member 8. It is an inverted trapezoidal convex engagement surface 12 that engages with the engagement surface 11. Further, on the inner side of the second key groove 7, the elasticity for abutting the upper surface of the second engaging member 9 to press and bias the second engaging member 9 toward the first engaging member 8 side. A body 10 is contained. In the case of the present embodiment, as shown in FIG. 3, the first engaging member 8, the second engaging member 9, and the elastic body 10 are arranged in the first key groove 3 and the second key groove 7. The elastic body 10 is formed in a slender shape in the longitudinal direction, and a wavy leaf spring is used for the elastic body 10.
【００１４】次に、図４によって、前述したように構成
されている過負荷保護機構１の動作について説明する。
同図（ａ）の状態は、スプロケット４と伝動軸２との間
で伝達されるトルクが許容トルクより小さい状態を示す
ものである。前記の状態では、第２の係合部材９の凸状
係合面１２は、弾性体１０の付勢力によって、第１の係
合部材８の凹状係合面１１内に完全に侵入しており、伝
動軸２とスプロケット４とは一体となって回転される。Next, the operation of the overload protection mechanism 1 configured as described above will be described with reference to FIG.
The state of (a) of the figure shows a state in which the torque transmitted between the sprocket 4 and the transmission shaft 2 is smaller than the allowable torque. In the above state, the convex engagement surface 12 of the second engagement member 9 is completely intruded into the concave engagement surface 11 of the first engagement member 8 by the urging force of the elastic body 10. The transmission shaft 2 and the sprocket 4 are integrally rotated.
【００１５】同図（ｂ）の状態は、スプロケット４と伝
動軸２間で伝達されるトルクが許容トルクに近づいた状
態を示すものであって、第１の係合部材８と第２の係合
部材９の間に作用する接線方向の力が増大し、第１の係
合部材８の凹状係合面１１の斜面の部分を第２の係合部
材９の凸状係合面１２の斜面の部分が弾性体１０の付勢
力に抗して上昇し、伝動軸２とスプロケット４とが相対
的に僅かな回転を生じた状態を示している。The state shown in FIG. 1B shows a state in which the torque transmitted between the sprocket 4 and the transmission shaft 2 is close to the allowable torque, and the first engagement member 8 and the second engagement member 8 are engaged. The tangential force acting between the mating members 9 increases, and the sloped portion of the concave engagement surface 11 of the first engagement member 8 is replaced by the sloped surface of the convex engagement surface 12 of the second engagement member 9. Indicates that the portion of is raised against the urging force of the elastic body 10 and the transmission shaft 2 and the sprocket 4 are relatively slightly rotated.
【００１６】そして、スプロケット４と伝動軸２間で伝
達されるトルクが許容トルクを超えると同図（Ｃ）に示
すように、弾性体１０は、第１の係合部材８と第２の係
合部材９との係合状態を維持することができなくなっ
て、凹状係合面１１は凸状係合面１２から離脱し、第２
の係合部材９は、第２のキー溝７内に押し込まれてスプ
ロケット４が伝動軸２に対してスリップし、両者の間の
トルク伝達が遮断される。When the torque transmitted between the sprocket 4 and the transmission shaft 2 exceeds the permissible torque, the elastic body 10 has the first engaging member 8 and the second engaging member 8 as shown in FIG. The engagement state with the mating member 9 cannot be maintained, and the concave engagement surface 11 separates from the convex engagement surface 12, and
The engaging member 9 is pushed into the second key groove 7, the sprocket 4 slips with respect to the transmission shaft 2, and the torque transmission between them is interrupted.
【００１７】図５は、本発明の過負荷保護機構の別の実
施例を示すものであって、この実施例は、前述した実施
例のものと同様な構成の過負荷保護機構１’を、回転体
としての中空軸減速機Ａの中空の出力軸４’と、前記出
力軸４’内に嵌装される伝動軸としての被駆動軸２’と
の間に設けたものである。FIG. 5 shows another embodiment of the overload protection mechanism according to the present invention. In this embodiment, an overload protection mechanism 1'having the same structure as that of the above-mentioned embodiment is provided. It is provided between a hollow output shaft 4'of a hollow shaft reducer A as a rotating body and a driven shaft 2'as a transmission shaft fitted in the output shaft 4 '.
【００１８】すなわち、本実施例では、過負荷保護機構
１’は、被駆動軸２’に形成されている第１のキー溝
３’と中空の出力軸４’の軸孔６’内面に形成されてい
る第２のキー溝７’との間に、第１の係合部材８’、第
２の係合部材９’、及び、弾性体１０’が組み込まれて
構成されている。That is, in this embodiment, the overload protection mechanism 1'is formed on the first key groove 3'formed on the driven shaft 2'and the inner surface of the shaft hole 6'of the hollow output shaft 4 '. A first engaging member 8 ', a second engaging member 9', and an elastic body 10 'are incorporated between the second key groove 7'and the second key groove 7'.
【００１９】前記中空軸減速機Ａは、ハウジングＢの両
側で一対の軸受Ｃ，Ｃによって回転自在に支持されてい
る入力軸Ｄと、前記ハウジングＢ内を貫通して両側で一
対の軸受Ｅ，Ｅによって、回転自在に支持されている中
空の出力軸４’とを備えている。前記入力軸Ｄと出力軸
４’とは並行に配置されており、ハウジングＢの内部
で、入力軸Ｄに設けられている小ギヤＦが出力軸４’に
固定されている大ギヤＧと噛み合い、入力軸Ｄの回転
が、減速されて出力軸４’に伝達されるように構成され
ている。The hollow shaft reducer A has an input shaft D rotatably supported by a pair of bearings C, C on both sides of a housing B, and a pair of bearings E, which penetrates the housing B on both sides. And a hollow output shaft 4'which is rotatably supported by E. The input shaft D and the output shaft 4'are arranged in parallel with each other, and inside the housing B, a small gear F provided on the input shaft D meshes with a large gear G fixed to the output shaft 4 '. , The rotation of the input shaft D is decelerated and transmitted to the output shaft 4 ′.
【００２０】そして、入力軸Ｄが図示しないモータ等の
回転駆動源に連結されて回転されると、中空の出力軸
４’が回転され、被駆動軸２’は、過負荷保護機構１’
を介して回転駆動される。そして被駆動軸２’に過負荷
トルクが作用した場合には、前述した実施例の場合と同
様に、過負荷保護機構１’の第１の係合部材８’に対し
て第２の係合部材９’が、弾性体１０’の付勢力に抗し
て外れてスリップし、出力軸と被駆動軸２’との間のト
ルクの伝達が遮断される。When the input shaft D is connected to a rotary drive source such as a motor (not shown) and rotated, the hollow output shaft 4'is rotated, and the driven shaft 2'is overloaded by the overload protection mechanism 1 '.
It is rotationally driven via. Then, when an overload torque acts on the driven shaft 2 ', the second engagement with the first engagement member 8'of the overload protection mechanism 1'is performed as in the case of the above-described embodiment. The member 9'is disengaged and slips against the urging force of the elastic body 10 ', and the transmission of torque between the output shaft and the driven shaft 2'is interrupted.
【００２１】前記過負荷保護機構１’は、本実施例に示
した構造の中空軸減速機の他に、ウォームギヤ、ベベル
ギヤ、ハイポイドギヤ、ヘリカルギヤ等を用いた中空軸
減速機に対しても同様に適用することができる。次に、
図６は、本発明の過負荷保護機構のさらに別の実施例を
示すものであって、前述した実施例の第２の係合部材９
が細長い形状の単一部品で形成されていたのに対し、本
実施例では、第２の係合部材として３つの鋼球９Ａが用
いられており、前記３つの鋼球９Ａのそれぞれが、コイ
ルバネ１０Ａによってそれぞれ独立して移動可能に、図
示していない回転体の第２のキー溝内に収容されてい
る。The overload protection mechanism 1'is similarly applied to a hollow shaft reducer having a structure shown in this embodiment, as well as a hollow shaft reducer using a worm gear, a bevel gear, a hypoid gear, a helical gear or the like. can do. next,
FIG. 6 shows still another embodiment of the overload protection mechanism of the present invention, which is the second engaging member 9 of the above-mentioned embodiment.
Is formed of a single component having an elongated shape, in the present embodiment, three steel balls 9A are used as the second engaging member, and each of the three steel balls 9A is a coil spring. Each of them is housed in a second key groove of a rotating body (not shown) so as to be independently movable by 10A.
【００２２】前記３つ鋼球９Ａとコイルバネ１０Ａは、
第２のキー溝内に配置されるガイドブロック１３の支持
穴１３Ａ内に出没自在に収容されており、図示していな
い第１のキー溝と第２のキー溝とが対向している位置で
は、各鋼球９Ａは、ガイドブロック１３の支持穴１３Ａ
から一部突出して、第１のキー溝３内に収容されている
第１の係合部材８の凹状係合面１１と係合するように構
成されている。The three steel balls 9A and the coil spring 10A are
It is housed in the support hole 13A of the guide block 13 arranged in the second key groove so as to be retractable, and at a position where the first key groove and the second key groove (not shown) face each other. , Each steel ball 9A has a support hole 13A for the guide block 13.
It is configured so as to partially project from and engage with the concave engagement surface 11 of the first engagement member 8 housed in the first key groove 3.
【００２３】そして、伝動軸と回転体との間に過負荷ト
ルクが加えられた場合に、凹状係合面１１の斜面によっ
て、各鋼球９Ａはコイルバネ１０Ａの付勢力に抗してガ
イドブロック１３内に没入され、伝動軸２とスプロケッ
ト４とがスリップし、過負荷トルクを遮断する。Then, when an overload torque is applied between the transmission shaft and the rotating body, each steel ball 9A resists the biasing force of the coil spring 10A due to the slope of the concave engaging surface 11. The power transmission shaft 2 and the sprocket 4 slip inside, and shut off the overload torque.
【００２４】なお、第１の係合部材８に形成される凹状
係合面１１は、鋼球９Ａと安定した係合を行うために、
前記鋼球９Ａと対向した位置に凹状の円錐面または球面
に形成することができる。前記鋼球９Ａの数は、許容ト
ルクの大きさによって適宜増減することができる。ま
た、図６の実施例に示す構造の過負荷保護機構は、伝動
軸の外周面と軸孔の内周面との間に複数箇所設けること
ができ、過負荷保護機構の設置個所を複数にするこによ
って、許容トルクを増大することができる。The concave engagement surface 11 formed on the first engagement member 8 is for stable engagement with the steel ball 9A.
A concave conical surface or a spherical surface may be formed at a position facing the steel ball 9A. The number of the steel balls 9A can be appropriately increased or decreased depending on the magnitude of the allowable torque. Further, the overload protection mechanism having the structure shown in the embodiment of FIG. 6 can be provided at a plurality of positions between the outer peripheral surface of the transmission shaft and the inner peripheral surface of the shaft hole, and the overload protection mechanism can be installed at a plurality of locations. As a result, the allowable torque can be increased.
【００２５】図７は、図６の実施例をさらに発展させた
別の実施例であって、この実施例では、図７（ａ）に示
すように、回転体のボス５Ａと伝動軸２Ａとの間に円周
方向に等間隔で３カ所に、図６に示したものと同様な構
造の過負荷保護機構１Ａ，１Ｂ，１Ｃが配置されてい
る。但し、本実施例では、過負荷保護機構１Ａでは、同
図（ｂ）に示すように鋼球９Ａが両側に離れて２個配置
され、また、過負荷保護機構１Ｂでは、右側に寄せて２
個配置され、さらに、過負荷保護機構１Ｃでは、左側に
寄せて２個配置されている。FIG. 7 shows another embodiment which is a further development of the embodiment shown in FIG. 6. In this embodiment, as shown in FIG. 7A, the boss 5A of the rotating body and the transmission shaft 2A are connected to each other. Overload protection mechanisms 1A, 1B, and 1C having a structure similar to that shown in FIG. 6 are arranged at three locations in the circumferential direction at equal intervals. However, in this embodiment, in the overload protection mechanism 1A, two steel balls 9A are arranged apart from each other on both sides, as shown in FIG.
In the overload protection mechanism 1C, two pieces are arranged closer to the left side.
【００２６】一方、これらの鋼球９Ａが係合する図示し
ていない第１の係合部材には、鋼球９Ａと対向している
位置にのみ凹状係合面が設けられ、第１の係合部材の他
の部分は、伝動軸の外周面と同一面となるように形成さ
れている。図７に示すものでは、伝動軸２Ａと回転体の
ボス５Ａ間に過負荷トルクが生じて、それぞれの過負荷
保護機構１Ａ，１Ｂ，１Ｃの部分で鋼球９Ａが対向する
第１の係合部材の凹状係合面から外れて、伝動軸２Ａと
回転体とがスリップすると、回転体と伝動軸２Ａとが完
全に一回転分スリップするまでは、鋼球９Ａと凹状係合
面とがすべて再係合することがなく、スリップする回転
量を大きくできる。On the other hand, the first engaging member (not shown) with which the steel balls 9A are engaged is provided with the concave engaging surface only at the position facing the steel balls 9A, and the first engaging member is provided. The other part of the coupling member is formed so as to be flush with the outer peripheral surface of the transmission shaft. In the structure shown in FIG. 7, an overload torque is generated between the transmission shaft 2A and the boss 5A of the rotating body, and the steel balls 9A are opposed to each other in the first engagement in the respective overload protection mechanisms 1A, 1B, 1C. When the transmission shaft 2A and the rotating body slip off from the concave engaging surface of the member, the steel ball 9A and the concave engaging surface are all covered until the rotating body and the transmitting shaft 2A completely slip by one rotation. The amount of rotation that slips can be increased without re-engagement.
【００２７】これは、単に同一構成の過負荷保護機構を
複数設けただけでは、過負荷トルクによって、一度伝動
軸と回転体とがスリップしても、鋼球９Ａが次の凹状係
合面の位置まで移動すると直ちに再係合してしまい、過
負荷検出用スイッチ等を作動させるために十分なスリッ
プ量が得られない場合があり、各過負荷保護機構９Ａ，
９Ｂ，９Ｃを伝動軸の中心Ｏに対して回転対称とならな
いように構成とすることによって、１回転分の長いスリ
ップ量が得られ、駆動源を停止させたり警報を発するた
めの過負荷検出用スイッチを確実に作動させることがで
きる。This is because, by simply providing a plurality of overload protection mechanisms of the same construction, even if the transmission shaft and the rotating body slip once due to overload torque, the steel ball 9A will be the next concave engagement surface. When it is moved to the position, it may be re-engaged immediately and a sufficient slip amount for operating the overload detection switch or the like may not be obtained, and each overload protection mechanism 9A,
By configuring 9B and 9C so as not to be rotationally symmetric with respect to the center O of the transmission shaft, a long slip amount for one rotation can be obtained and for overload detection for stopping the drive source or issuing an alarm. The switch can be operated reliably.
【００２８】また、伝動軸と回転体のボスとの間に同一
構成の複数箇所過負荷保護機構を設ける場合に、円周方
向に互いに隣接する過負荷保護機構の間の間隔を異なら
せて伝動軸の中心に対して回転対称な構造とならないよ
うにすることによっても、過負荷トルクが作用した際
に、伝動軸と回転体とが１回転分スリップした位置のみ
ですべての過負荷保護機構の第１の係合部材と第２の係
合部材とが再係合するようにできる。Further, when a plurality of overload protection mechanisms having the same structure are provided between the transmission shaft and the boss of the rotating body, transmission is performed with different intervals between the overload protection mechanisms adjacent to each other in the circumferential direction. Even if the structure is not rotationally symmetric with respect to the center of the shaft, even when the overload torque acts, the transmission shaft and the rotating body slip only one rotation, and all the overload protection mechanisms are operated. The first engagement member and the second engagement member can be re-engaged.
【００２９】なお、前述した各実施例においては、凹状
係合面を有する第１の係合部材を伝動軸側に配置し、ま
た、凸状係合面を有する第２の係合部材または鋼球で構
成されている第２の係合部材、及び、弾性体を回転体側
に配置しているが、伝動軸側に弾性体及び第２の係合部
材を配置し、また、回転体側に第１の係合部材を配置し
てもよい。さらに、第１の係合部材と第２の係合部材の
それぞれに形成されている係合面の形状も、前述した各
実施例のものに限定するものではなく、例えば、連続し
た多数の台形歯状あるいは三角歯状の係合面で形成して
もよい。In each of the above-mentioned embodiments, the first engaging member having the concave engaging surface is arranged on the transmission shaft side, and the second engaging member having the convex engaging surface or steel. Although the second engaging member formed of a sphere and the elastic body are arranged on the rotating body side, the elastic body and the second engaging member are arranged on the transmission shaft side, and the second engaging member and the elastic body are arranged on the rotating body side. You may arrange one engaging member. Further, the shape of the engagement surface formed on each of the first engagement member and the second engagement member is not limited to that of each of the above-described embodiments, and for example, a large number of continuous trapezoids can be formed. It may be formed by a tooth-shaped or triangular tooth-shaped engaging surface.
【００３０】[0030]
【発明の効果】以上に説明したように、本発明の過負荷
保護機構によれば、伝動軸に形成されているキー溝と前
記伝動軸に固定される回転体に形成されているキー溝と
の間の空間を利用しているため、過負荷保護機構を設け
るためのスペースを確保する必要がない。As described above, according to the overload protection mechanism of the present invention, the key groove formed in the transmission shaft and the key groove formed in the rotating body fixed to the transmission shaft are provided. Since the space between them is used, it is not necessary to secure a space for providing the overload protection mechanism.
【００３１】その結果、既設の機械装置の伝動軸と回転
体との間に後から組み込むことができ、また、過負荷保
護機構を設ける必要がなくなった場合には、伝動軸と回
転体との間から取り除いて代わりに通常のキーによって
直結した状態に戻すことが容易にできる。また、伝動軸
や回転体を過負荷保護機構の構成部品の一部として利用
しているため、構造が簡単で製造や組立のコストを安く
することができる。As a result, it is possible to retrofit between the transmission shaft and the rotating body of the existing mechanical device, and when it becomes unnecessary to provide an overload protection mechanism, the transmission shaft and the rotating body can be separated from each other. It can be easily removed by removing it from the space and returning it to the state directly connected by a normal key. Further, since the transmission shaft and the rotating body are used as a part of the components of the overload protection mechanism, the structure is simple and the manufacturing and assembling costs can be reduced.
【００３２】さらに、本発明の過負荷保護機構は、伝動
軸と回転体の軸孔との間に複数箇所設けることによっ
て、大きなトルクを伝達することも可能となる。その場
合に、複数の過負荷保護機構を伝動軸の中心に対して非
対称な構造とすれば、伝動軸と回転体とが１回転分スリ
ップするまでは、すべての箇所の過負荷保護機構の第１
の係合部材と第２の係合部材とが再係合しないため、過
負荷が生じて各過負荷防止装置の第１の係合部材と第２
の係合部材との間の係合が外れた場合に全部の第１の係
合部材と第２の係合部材が再係合するまでに、過負荷検
出スイッチを確実に作動させるための十分なスリップ量
を得ることができる。Further, by providing the overload protection mechanism of the present invention at a plurality of positions between the transmission shaft and the shaft hole of the rotating body, it becomes possible to transmit a large torque. In such a case, if the plurality of overload protection mechanisms are asymmetrical with respect to the center of the transmission shaft, the first overload protection mechanism at all locations will be kept until the transmission shaft and the rotating body slip by one rotation. 1
Since the second engaging member and the second engaging member do not re-engage, an overload occurs and the first engaging member and the second engaging member of each overload prevention device
When the engagement between the first engagement member and the second engagement member is disengaged, it is sufficient to reliably operate the overload detection switch until all the first engagement members and the second engagement members are re-engaged. The slip amount can be obtained.
【図１】 本発明の過負荷保護機構の１実施例を示す断
面図である。FIG. 1 is a sectional view showing an embodiment of an overload protection mechanism of the present invention.
【図２】 図１のＡ−Ａ線位置における拡大部分断面図
である。FIG. 2 is an enlarged partial sectional view taken along the line AA of FIG.
【図３】 本発明の過負荷保護機構の構成部品を示す斜
視図である。FIG. 3 is a perspective view showing components of the overload protection mechanism of the present invention.
【図４】 本発明の過負荷保護機構の動作を説明する図
である。FIG. 4 is a diagram for explaining the operation of the overload protection mechanism of the present invention.
【図５】 本発明の過負荷保護機構の別の実施例を示す
断面図である。FIG. 5 is a sectional view showing another embodiment of the overload protection mechanism of the present invention.
【図６】 本発明の過負荷保護機構のさらに別の実施例
を示す斜視図である。FIG. 6 is a perspective view showing still another embodiment of the overload protection mechanism of the present invention.
【図７】 本発明の過負荷保護機構のさらに別の実施例
を示す図である。FIG. 7 is a view showing still another embodiment of the overload protection mechanism of the present invention.
【図８】 従来の過負荷保護装置の一例を示す図であ
る。FIG. 8 is a diagram showing an example of a conventional overload protection device.
１，１’１Ａ，１Ｂ，１Ｃ 過負荷保護機構 ２ 伝動軸 ２’ 被駆動軸（伝動軸） ３，３’ 第１のキー溝 ４ スプロケット（回転体） ４’ 出力軸（回転体） ５ ボス ６，６’ 軸孔 ７，７’ 第２のキー溝 ８，８’ 第１の係合部材 ９，９’ 第２の係合部材 ９Ａ 鋼球（第２の係合部材） １０，１０’１０Ａ 弾性体 １１ 凹状係合面 １２ 凸状係合面 １３ ガイドブロック １３Ａ 支持穴 1, 1'1A, 1B, 1C Overload protection mechanism 2 Transmission shaft 2'Driven shaft (transmission shaft) 3, 3'First key groove 4 Sprocket (rotating body) 4'Output shaft (rotating body) 5 Boss 6,6 'Axial hole 7,7' Second key groove 8,8 'First engaging member 9,9' Second engaging member 9A Steel ball (second engaging member) 10,10 ' 10A elastic body 11 concave engagement surface 12 convex engagement surface 13 guide block 13A support hole
Claims (3)
軸と、 前記伝動軸が嵌合される軸孔の内周面に前記第１のキー
溝と対向した第２のキー溝が形成された回転体と、 前記第１のキー溝と第２のキー溝の何れか一方に収容さ
れる第１の係合部材と、他方に収容される第２の係合部
材と、 前記第１のキー溝と第２のキー溝の少なくとも一方に収
容され、前記第１の係合部材と第２の係合部材とを互い
に係合状態を保持するように付勢する弾性体とを備え、 前記第１の係合部材と第２の係合部材とは、前記伝動軸
と回転体との間の伝達トルクが所定の大きさ以上となっ
た場合に、相互の係合状態が解放される形状の係合面を
有していることを特徴とする過負荷保護機構。1. A transmission shaft having a first key groove formed on an outer peripheral surface thereof, and a second key groove opposed to the first key groove on an inner peripheral surface of a shaft hole into which the transmission shaft is fitted. A rotating body in which is formed, a first engaging member housed in one of the first key groove and the second key groove, a second engaging member housed in the other, An elastic body that is housed in at least one of the first key groove and the second key groove and that urges the first engaging member and the second engaging member so as to maintain the engaged state with each other. The first engagement member and the second engagement member release the mutual engagement state when the transmission torque between the transmission shaft and the rotating body becomes a predetermined magnitude or more. An overload protection mechanism having an engagement surface of the shape described above.
れぞれ伝動軸と回転体の複数箇所に形成されていること
を特徴とする請求項１記載の過負荷保護機構。2. The overload protection mechanism according to claim 1, wherein the first key groove and the second key groove are formed at a plurality of positions on the transmission shaft and the rotary body, respectively.
らない構造を有し、伝動軸と回転体とが過負荷トルクが
作用した際に、１回転分スリップするまでは、すべての
第１の係合部材と第２の係合部材とが再係合しないよう
に構成されていることを特徴とする請求項２記載の過負
荷保護機構。3. A structure having no rotational symmetry with respect to the center of the transmission shaft, and when the transmission shaft and the rotating body are subjected to overload torque, all the first shafts are slipped until one slip occurs. The overload protection mechanism according to claim 2, wherein the engagement member and the second engagement member are configured not to be re-engaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23856795A JP3040941B2 (en) | 1995-09-18 | 1995-09-18 | Overload protection mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23856795A JP3040941B2 (en) | 1995-09-18 | 1995-09-18 | Overload protection mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0979293A true JPH0979293A (en) | 1997-03-25 |
| JP3040941B2 JP3040941B2 (en) | 2000-05-15 |
Family
ID=17032148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23856795A Expired - Fee Related JP3040941B2 (en) | 1995-09-18 | 1995-09-18 | Overload protection mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3040941B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415628B1 (en) * | 2001-07-09 | 2004-01-24 | 주식회사 안다미로 | Apparatus for preventing undeserved load on motor |
| JP2016108841A (en) * | 2014-12-08 | 2016-06-20 | 太陽工業株式会社 | Wind pressure countermeasure tent |
| CN105881053A (en) * | 2016-06-01 | 2016-08-24 | 重庆市星极齿轮有限责任公司 | Fast fixing device for gears |
| JP2018020618A (en) * | 2016-08-02 | 2018-02-08 | 株式会社ミツバ | Reaction force generation device |
| JP2018105477A (en) * | 2016-12-28 | 2018-07-05 | 立川ブラインド工業株式会社 | Clutch device |
| CN113803383A (en) * | 2021-09-30 | 2021-12-17 | 兰州万里航空机电有限责任公司 | Overload protection anti-slip device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6282155B2 (en) | 2014-03-28 | 2018-02-21 | キヤノン株式会社 | One-way clutch and sheet conveying roller |
-
1995
- 1995-09-18 JP JP23856795A patent/JP3040941B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415628B1 (en) * | 2001-07-09 | 2004-01-24 | 주식회사 안다미로 | Apparatus for preventing undeserved load on motor |
| JP2016108841A (en) * | 2014-12-08 | 2016-06-20 | 太陽工業株式会社 | Wind pressure countermeasure tent |
| CN105881053A (en) * | 2016-06-01 | 2016-08-24 | 重庆市星极齿轮有限责任公司 | Fast fixing device for gears |
| JP2018020618A (en) * | 2016-08-02 | 2018-02-08 | 株式会社ミツバ | Reaction force generation device |
| JP2018105477A (en) * | 2016-12-28 | 2018-07-05 | 立川ブラインド工業株式会社 | Clutch device |
| CN113803383A (en) * | 2021-09-30 | 2021-12-17 | 兰州万里航空机电有限责任公司 | Overload protection anti-slip device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3040941B2 (en) | 2000-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7686150B2 (en) | Governor device for door | |
| US5636071A (en) | Speed reduction device for an electrically powered foldable rearview mirror | |
| US6012985A (en) | Method and means for coupling shafts | |
| TWI790321B (en) | power transmission device | |
| MX2011009211A (en) | Locking differential. | |
| JPH0979293A (en) | Overload protecting mechanism | |
| US5533712A (en) | Electric hoist and traction apparatus | |
| EP0877182B1 (en) | Power transmission mechanism | |
| KR100945099B1 (en) | Electronically actuated locking differential | |
| US6309304B1 (en) | Internal torque limiter for a parallel indexer | |
| JP2004019938A (en) | Actuator for valves | |
| JP3046544B2 (en) | Hollow shaft reducer with overload protection device | |
| US2573140A (en) | Safety clutch | |
| JP3725821B2 (en) | Torque limiter | |
| JP6356892B1 (en) | Small structure reverse input cutoff clutch | |
| JP2007247761A (en) | Reverse input cutoff clutch | |
| JP3213512B2 (en) | Overload protection device | |
| JP3035196B2 (en) | Hollow shaft reducer with overload protection device | |
| JPH08135692A (en) | Clutch having torque limiter | |
| EP0243431B1 (en) | Clutching device and method for controlling the movement of the shaft of a hoisting machinery | |
| RU2136986C1 (en) | Wave gear transmission | |
| JP2004347005A (en) | Reverse input prevention clutch and electric power seat device using the clutch | |
| JP2572978Y2 (en) | A rotation transmission device that can rotate the output shaft by the input shaft | |
| US5865284A (en) | Formlock shoes with flats | |
| JP2543302B2 (en) | Electric hoisting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |