JP2020101252A - Lock type bidirectional clutch using coil spring - Google Patents
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Abstract
Description
本発明は、入力部材と出力部材との間の動力伝達状態を変更するクラッチ装置、特に、入力部材（駆動側）からの正・逆回転の動力を伝達するとともに、出力部材（従動側）からの動力伝達は出力部材を回転不能として遮断する、コイルばねを用いたロックタイプ双方向クラッチに関する。 The present invention relates to a clutch device that changes a power transmission state between an input member and an output member, and in particular, transmits forward/reverse rotation power from an input member (driving side) and outputs the power from an output member (driven side). Is related to a lock type two-way clutch using a coil spring, which cuts off the output member so that it cannot rotate.
モーターなどの駆動源から作業機器等を駆動する動力伝達系、例えば、モーターにより物品を上下に移送する昇降装置では、物品が所定の位置に達したとき、モーターを停止すると物品が自動的にその位置を保持する作動が求められる場合がある。そのため、入力部材と出力部材を備えたロックタイプの双方向クラッチを用いて、入力部材を正・逆回転可能なモーターに連結するとともに、出力部材の回転により物品を昇降させる装置が知られている。 In a power transmission system that drives work equipment and the like from a drive source such as a motor, for example, in a lifting device that vertically moves an article by a motor, when the article reaches a predetermined position, the article is automatically stopped when the motor is stopped. A position holding operation may be required. Therefore, there is known a device that uses a lock type bidirectional clutch including an input member and an output member to connect the input member to a motor capable of forward and reverse rotations and to raise and lower an article by rotating the output member. ..
ロックタイプの双方向クラッチは、例えば、複写機のフィニッシャーにおいて、用紙を載せた用紙テーブルを移送する昇降装置、あるいは、建築物の窓のブラインドを昇降する昇降装置にも適用される。そして、これを利用すると簡易な装置による自動的な動力伝達の制御が可能となって、例えば、ブレーキ機構を設けて電気的に制御する場合のような、電力等の使用が不必要となるとともに、出力部材側から不測の逆入力があった場合に、駆動源のモーターを保護することも可能となる。 The lock type two-way clutch is also applied to, for example, an elevating device for transferring a paper table on which paper is placed, or an elevating device for elevating a window blind of a building in a finisher of a copying machine. Then, by utilizing this, it becomes possible to automatically control the power transmission by a simple device, and it becomes unnecessary to use electric power or the like as in the case of electrically controlling by providing a brake mechanism. It is also possible to protect the motor of the drive source when there is an unexpected reverse input from the output member side.
従来のロックタイプ双方向クラッチとして、例えば本出願人の創案に係る特許文献１に記載されたクラッチが公知であり、これについて図１２を参照して説明する。図１２のクラッチは、断面円形の内部空間が設けられた固定のハウジングＨと、ハウジングＨの内側に設置され共通の回転軸を中心として回転可能な入力軸Ｉ及び出力軸Ｅと、ハウジングＨに固着された円筒軸状の内輪Ｎと、内輪Ｎの外周面に装着される１個のコイルばねＳとを備えている。ハウジングＨは端板Ｐと端板Ｐの周縁から軸方向に延びる筒壁Ｃとを備え、筒壁Ｃの自由端縁部にシールド板Ｓが圧入されることで内側に内部空間が画成されている。入力軸Ｉ及び出力軸Ｅには、軸方向に延びる断面円弧状の入力係止片ＩＥ及び出力係止片ＯＥが夫々形成されている。入力軸Ｉと出力軸Ｅとは、相互に対向すると共に、入力係止片ＩＥと出力係止片ＯＥとが周方向に２個の間隙が存在するようにして組み合わされている。コイルばねＳは線材を巻回して形成され、軸方向両端には外方に曲げられたフック部Ｆが周方向の異なる位置に形成されている。コイルばねＳの内周面は内輪Ｎの外周面と接触している。フック部Ｆの各々は入力係止片ＩＥと出力係止片ＯＥとによって画成される上記２個の間隙の各々に挿入されている。 As a conventional lock type bidirectional clutch, for example, a clutch described in Patent Document 1 related to the invention of the present applicant is known, and this will be described with reference to FIG. The clutch shown in FIG. 12 includes a fixed housing H provided with an internal space having a circular cross section, an input shaft I and an output shaft E installed inside the housing H and rotatable about a common rotation shaft, and a housing H. It is provided with a fixed cylindrical shaft-shaped inner ring N and one coil spring S mounted on the outer peripheral surface of the inner ring N. The housing H includes an end plate P and a cylinder wall C that extends in the axial direction from the peripheral edge of the end plate P. The shield plate S is press-fitted into the free end edge of the cylinder wall C to define an internal space inside. ing. The input shaft I and the output shaft E are respectively formed with an input locking piece IE and an output locking piece OE each having an arcuate cross section and extending in the axial direction. The input shaft I and the output shaft E are opposed to each other, and the input locking piece IE and the output locking piece OE are combined so that two gaps exist in the circumferential direction. The coil spring S is formed by winding a wire rod, and hook portions F bent outward are formed at both ends in the axial direction at different positions in the circumferential direction. The inner peripheral surface of the coil spring S is in contact with the outer peripheral surface of the inner ring N. Each of the hook portions F is inserted into each of the two gaps defined by the input locking piece IE and the output locking piece OE.
入力軸Ｉが回転すると、その回転方向に応じ、入力係止片ＩＥがコイルばねＳの２個のフック部Ｆのいずれか（回転方向の前方にあるフック部Ｆ）に当接してこれを押す。この際には、押す力はばねの緩め方向（コイルばねＳと内輪Ｎとの間の摩擦力が減少する方向）に作用する。そして、入力係止片ＩＥによる上記押す力によって、コイルばねＳの内輪Ｎに対する締め付け力が所定程度緩められると、入力係止片ＩＥはコイルばねＳと共に内輪Ｎに対して幾分回転し、フック部Ｆが出力係止片ＯＥと当接する。このとき、出力軸Ｅは自由に回転可能であるため、結果として、入力係止片ＩＥは、コイルばねＳ、及び出力係止片ＯＥと一体となってハウジングＨ及び内輪Ｎに対して回転する。即ち、入力軸Ｉの回転は、出力軸Ｅに伝達される。
一方、出力軸Ｅが回転しようとした際には、その回転方向に応じ、出力係止片ＯＥがコイルばねＳの２個のフック部Ｆのいずれか（回転方向の前方にあるフック部Ｆ）に当接してこれを押す。この際には、押す力はばねの締め方向（コイルばねＳと内輪Ｎとの間の摩擦力が増大する方向）に作用し、また、コイルばねＳが装着された内輪ＮはハウジングＨに固定されているため、出力係止片ＯＥが回転することはない。即ち、出力軸Ｅの回転は入力軸Ｉに伝達されず遮断される。
When the input shaft I rotates, the input locking piece IE comes into contact with one of the two hook portions F of the coil spring S (the hook portion F located forward in the rotation direction) and pushes the input locking piece IE according to the rotation direction. .. At this time, the pushing force acts in the loosening direction of the spring (the direction in which the frictional force between the coil spring S and the inner ring N decreases). Then, when the tightening force of the coil spring S with respect to the inner ring N is relaxed to a predetermined extent by the pushing force of the input locking piece IE, the input locking piece IE rotates together with the coil spring S with respect to the inner ring N to some extent, and the hook. The portion F contacts the output locking piece OE. At this time, since the output shaft E can freely rotate, as a result, the input locking piece IE rotates integrally with the coil spring S and the output locking piece OE with respect to the housing H and the inner ring N. .. That is, the rotation of the input shaft I is transmitted to the output shaft E.
On the other hand, when the output shaft E is about to rotate, the output locking piece OE is either one of the two hook portions F of the coil spring S (the hook portion F on the front side in the rotation direction) depending on the rotation direction. Abut and push this. At this time, the pushing force acts in the tightening direction of the spring (the direction in which the frictional force between the coil spring S and the inner ring N increases), and the inner ring N on which the coil spring S is mounted is fixed to the housing H. Therefore, the output locking piece OE does not rotate. That is, the rotation of the output shaft E is cut off without being transmitted to the input shaft I.
特許文献１のロックタイプ双方向クラッチは、部品点数が少なく且つコンパクトであって製造工程も容易であるが、未だ十分なものではなく、更なる製造コストの低減及びコンパクト化が要求されている。 The lock type bidirectional clutch of Patent Document 1 has a small number of parts, is compact, and has an easy manufacturing process. However, it is not sufficient yet, and further reduction of manufacturing cost and downsizing are required.
本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、より製造コストが安価であって且つコンパクトな新規且つ改良されたロックタイプ双方向クラッチを提供することである。 The present invention has been made in view of the above facts, and its main technical problem is to provide a new and improved lock type bidirectional clutch that is more inexpensive to manufacture and compact.
本発明者は、鋭意検討の結果、入力部材が入力端板と、入力端板の周縁から延びる筒壁とを備え、筒壁と固定のフランジとが係合手段によって軸方向に係合され、入力部材はフランジに対して回転可能となるようにすることによって、上記主たる技術的課題を達成することを見出した。 The present inventor, as a result of earnest studies, the input member includes an input end plate and a cylindrical wall extending from the peripheral edge of the input end plate, and the cylindrical wall and the fixed flange are axially engaged by the engaging means, It has been found that the main technical problem mentioned above is achieved by making the input member rotatable with respect to the flange.
即ち、本発明によれば、上記主たる技術的課題を達成するロックタイプ双方向クラッチとして、共通の回転軸を中心として回転可能な入力部材及び出力部材を備え、前記入力部材からの正・逆方向の回転は前記出力部材に伝達されると共に、前記出力部材からの前記入力部材への回転の伝達は、前記出力部材を回転不能として遮断されるロックタイプ双方向クラッチであって、
前記入力部材と組み合わされて閉塞された収容空間を画成する固定のフランジと、前記収容空間内において前記フランジに固定された軸状の内輪と、前記内輪に装着されたコイルばねとを備え、
前記入力部材は入力端板と、前記入力端板の周縁から延びる筒壁とを有し、前記筒壁と前記フランジとは係合手段によって軸方向に係合され、前記入力部材は前記フランジに対して回転可能であり、
前記コイルばねは、線材を巻回して形成され、軸方向の両端には外方に曲げられたフック部が周方向の異なる位置に形成され、内周面は前記内輪の外周面と接触し、
前記入力部材及び出力部材には軸方向に延びる入力係止片及び出力係止片が夫々形成され、前記入力係止片及び出力係止片は、周方向に２個の間隙が存在するよう、組み合わされて設置され、
前記２個の間隙の夫々には、前記コイルばねの両端のフック部が挿入され、
前記入力部材が回転したときは、前記入力係止片が前記コイルばねのフック部をばねの緩み方向に押して、前記コイルばねと共に前記出力部材を回転させ、前記出力部材に回転力を加えたときは、前記出力係止片が前記コイルばねのフック部をばねの締め方向に押して、前記出力部材が回転不能となる、ことを特徴とするロックタイプ双方向クラッチが提供される。
That is, according to the present invention, as a lock type bidirectional clutch that achieves the above-mentioned main technical problems, an input member and an output member rotatable about a common rotation shaft are provided, and the forward and reverse directions from the input member are provided. The rotation of is transmitted to the output member, the transmission of rotation from the output member to the input member is a lock type two-way clutch which is cut off by locking the output member,
A fixed flange that defines a closed housing space in combination with the input member; a shaft-shaped inner ring fixed to the flange in the housing space; and a coil spring attached to the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate, the cylindrical wall and the flange are axially engaged by an engaging means, and the input member is attached to the flange. It can rotate with respect to
The coil spring is formed by winding a wire rod, and outwardly bent hook portions are formed at different positions in the circumferential direction at both ends in the axial direction, and the inner peripheral surface contacts the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hook portions at both ends of the coil spring are inserted into the two gaps,
When the input member rotates, when the input locking piece pushes the hook portion of the coil spring in the loosening direction of the spring to rotate the output member together with the coil spring, and applies a rotational force to the output member. The lock-type two-way clutch is characterized in that the output locking piece pushes the hook portion of the coil spring in the tightening direction of the spring, so that the output member cannot rotate.
好ましくは、前記係合手段は、前記筒壁の先端部において周方向に連続して延在する環状被係合爪と、前記フランジにおいて周方向に間隔をおいて配置された複数個の係合爪とから構成される。この場合には、前記フランジには前記筒壁の先端部が嵌り込む環状溝が設けられ、該係合爪は前記溝の外周縁に沿って配置されているのがよい。また、前記係合爪の基端部の径方向外側及び内側には夫々前記基端部に隣接して貫通穴部が形成されており、前記基端部は薄肉片状にせしめられているのが好適である。好ましくは、前記入力係止片は前記筒壁の内周面に固着されている。好適には、前記入力係止片及び出力係止片は共に断面円弧状であって、１個ずつ形成されている。 Preferably, the engagement means includes an annular engaged claw that extends continuously in the circumferential direction at the tip end portion of the cylindrical wall, and a plurality of engagements that are arranged at intervals in the circumferential direction on the flange. Composed of nails. In this case, it is preferable that the flange is provided with an annular groove into which the tip of the cylindrical wall is fitted, and the engaging claw is arranged along the outer peripheral edge of the groove. Further, through holes are formed on the outer side and the inner side in the radial direction of the base end of the engaging claw, respectively, adjacent to the base end, and the base end is formed into a thin piece. Is preferred. Preferably, the input locking piece is fixed to the inner peripheral surface of the cylindrical wall. Preferably, each of the input locking piece and the output locking piece has an arcuate cross section and is formed one by one.
本発明のロックタイプ双方向クラッチにおいては、入力部材は入力端板と、入力端板の周縁から延びる筒壁とを有し、筒壁とフランジとは係合手段によって軸方向に係合され、入力部材はフランジに対して回転可能な状態で組み合わされる。それ故に、本発明のロックタイプ双方向クラッチにあっては、従来はハウジングとシールド板によって画成されていた収容空間を、入力部材と固定のフランジによって画成することが可能となり、実質的にシールド板を省略することが可能となる。これにより、本発明のロックタイプ双方向クラッチにあっては、部品点数の削減によって製造コストが低減されると共に、省略されたシールド板の厚み分だけ軸方向にコンパクトにすることが可能となる。 In the lock type two-way clutch of the present invention, the input member has an input end plate and a cylindrical wall extending from the peripheral edge of the input end plate, and the cylindrical wall and the flange are axially engaged by the engaging means, The input member is rotatably assembled to the flange. Therefore, in the lock type two-way clutch of the present invention, the accommodation space conventionally defined by the housing and the shield plate can be defined by the input member and the fixed flange. It is possible to omit the shield plate. As a result, in the lock type bidirectional clutch of the present invention, it is possible to reduce the manufacturing cost by reducing the number of parts and to make the axial direction compact by the thickness of the omitted shield plate.
以下、添付図面を参照して、本発明に従って構成されたロックタイプ双方向クラッチの好適実施形態について、更に詳述する。 Hereinafter, preferred embodiments of a lock type bidirectional clutch constructed according to the present invention will be described in more detail with reference to the accompanying drawings.
図１及び図２を参照して説明すると、本発明に従って構成された、全体を番号２で示すロックタイプ双方向クラッチは、入力部材４と、出力部材６と、固定のフランジ８と、内輪１０と、コイルばね１２とを備えている。図１の断面図においては、容易に理解できるよう、入力部材４については右下方向へのハッチングを、出力部材６については左下方向へのハッチングを、内輪１０については薄墨を夫々付して示している（図１０及び図１１についても同様）。 Referring to FIGS. 1 and 2, a lock type bidirectional clutch, generally designated by reference numeral 2, constructed in accordance with the present invention includes an input member 4, an output member 6, a fixed flange 8 and an inner ring 10. And a coil spring 12. In the cross-sectional view of FIG. 1, for easy understanding, the input member 4 is hatched in the lower right direction, the output member 6 is hatched in the lower left direction, and the inner ring 10 is shown in thin ink. (The same applies to FIGS. 10 and 11).
主に図３を参照して説明すると、入力部材４は合成樹脂製であって、円板形状の入力端板１４と、この入力端板１４の周縁から軸方向に延びる筒壁１６とを有したカップ状部材である。入力端板１４の中央には、筒壁１６と平行に軸方向に延びる円筒壁１８が形成されている。円筒壁１８の基端部の内側には、軸方向に貫通した非円形穴２０が形成されている。入力部材４には更に、軸方向に延びる入力係止片２２も形成されている。図示の実施形態においては、入力係止片２２は筒壁１６の内周面に固着されている。入力係止片２２は断面円弧状であって周方向に１５０度の角度範囲に亘って延在し、その周方向両端面は径方向に直線状に延びている。入力係止片２２は軸方向に見て筒壁１６の基端からその先端部まで延在している。筒壁１６の外周面の先端部には、径方向外方に向かって突出し且つ周方向に連続して延在する環状被係合爪２４が形成されている。 Explaining mainly with reference to FIG. 3, the input member 4 is made of a synthetic resin and has a disc-shaped input end plate 14 and a cylindrical wall 16 extending in the axial direction from the peripheral edge of the input end plate 14. It is a cup-shaped member. At the center of the input end plate 14, a cylindrical wall 18 extending in the axial direction is formed parallel to the cylindrical wall 16. A non-circular hole 20 penetrating in the axial direction is formed inside the base end of the cylindrical wall 18. The input member 4 is also formed with an input locking piece 22 extending in the axial direction. In the illustrated embodiment, the input locking piece 22 is fixed to the inner peripheral surface of the cylindrical wall 16. The input locking piece 22 has an arcuate cross section and extends over an angular range of 150 degrees in the circumferential direction, and both circumferential end surfaces thereof extend linearly in the radial direction. The input locking piece 22 extends from the base end of the cylindrical wall 16 to its distal end when viewed in the axial direction. An annular engaged pawl 24 is formed at the tip of the outer peripheral surface of the cylindrical wall 16 so as to project outward in the radial direction and continuously extend in the circumferential direction.
主に図４を参照して説明すると、出力部材６は合成樹脂製であって、円環形状の出力端板２６を備えている。出力端板２６の片側面には、その内周縁部から軸方向片側に向かって延びる中空の軸部材２７が固着されている。軸部材２７は、大径円筒状の基端部２８と、中径円筒形状の中間部３０と、小径円筒形状部材の外周面の一部が切り欠かれた先端部３２とを備えている。基端部２８、中間部３０、及び先端部３２は同心状に軸方向に並列して配置されており、基端部２８と中間部３０との接続部、中間部３０と先端部３２との接続部には夫々、軸方向に対して実質上垂直な円環形状の第一の肩面３４、第二の肩面３６が形成されている。出力端板２６の片側面には更に、軸部材２７の付け根部分を囲繞する環状溝４０も形成されている。出力端板２６の他側面の外周縁部には、軸方向他側に僅かに突出した円環形状の突条４１が形成されている。出力部材６には更に、軸方向に延びる出力係止片４２も形成されている。図示の実施形態においては、出力係止片４２は断面円弧状であって周方向に１７０度の角度範囲に亘って延在し、出力端板２６の外周面に固着されている。出力係止片４２の基端と出力端板２６の端面（但し突条４１を除く）とは軸方向に見て整合している。出力係止片４２の周方向両端面は、径方向内側端部を除いて径方向に直線状に延びており、径方向内側端部はコイルばね１２の後述するフック部の基端部の形状と対応する弧状となっている。 Explaining mainly with reference to FIG. 4, the output member 6 is made of synthetic resin and includes an annular output end plate 26. A hollow shaft member 27 is fixed to one side surface of the output end plate 26 and extends from the inner peripheral edge portion thereof toward one side in the axial direction. The shaft member 27 includes a large-diameter cylindrical base end portion 28, a medium-diameter cylindrical intermediate portion 30, and a distal end portion 32 in which a part of the outer peripheral surface of the small-diameter cylindrical member is cut away. The proximal end portion 28, the intermediate portion 30, and the distal end portion 32 are concentrically arranged in parallel in the axial direction, and the connecting portion between the proximal end portion 28 and the intermediate portion 30 and the intermediate portion 30 and the distal end portion 32 are connected. A ring-shaped first shoulder surface 34 and a second shoulder surface 36, which are substantially perpendicular to the axial direction, are formed at the connecting portions, respectively. An annular groove 40 that surrounds the root portion of the shaft member 27 is also formed on one side surface of the output end plate 26. On the outer peripheral edge of the other side surface of the output end plate 26, a ring-shaped protrusion 41 slightly protruding to the other side in the axial direction is formed. The output member 6 is further formed with an output locking piece 42 extending in the axial direction. In the illustrated embodiment, the output locking piece 42 has an arcuate cross section, extends in the circumferential direction over an angle range of 170 degrees, and is fixed to the outer peripheral surface of the output end plate 26. The base end of the output locking piece 42 and the end surface of the output end plate 26 (excluding the protrusion 41) are aligned when viewed in the axial direction. Both end surfaces in the circumferential direction of the output locking piece 42 extend linearly in the radial direction except for the inner end portion in the radial direction, and the inner end portion in the radial direction has a shape of a base end portion of a hook portion of the coil spring 12 described later. It has an arc shape corresponding to.
主に図５を参照して説明すると、フランジ８は合成樹脂製の円板形状部材であって、その外径は入力端板１４の外径よりも大きい（図１も参照されたい）。中央には正６角形状の係止開口４４が形成され、外周縁部には周方向に等角度間隔をおいて３個の取付穴４６が形成されている。片側面の中央には、略円形の凹所４８が形成されている。凹所４８の径方向中間位置には、係止開口４４を囲繞して軸方向に幾分延びる円筒壁５０が形成され、この円筒壁５０と凹所４８の外周縁との間には環状溝５２が設けられている。円筒壁５０の延出端面の径方向中間部には、係止開口４４を囲繞して軸方向に更に僅かに突出する円筒形状の突出壁５４も形成されている。ここで、フランジ８には周方向に間隔をおいて配置された複数個の係合爪５６が形成されている。図示の実施形態においては、係合爪５６は溝５２の外周縁に沿って３個、等角度間隔をおいて配置されており、いずれも径方向内側に突出している。係合爪５６の基端部５８の径方向外側及び内側には夫々基端部５８に隣接して貫通穴部６０が形成されており、基端部５８は薄肉片状となっている。貫通穴部６０の断面形状は何れも略矩形であって、これらは基端部５８と共にその両端部と隣接する部分も薄肉片状となっている。 Explaining mainly with reference to FIG. 5, the flange 8 is a disc-shaped member made of synthetic resin, and its outer diameter is larger than the outer diameter of the input end plate 14 (see also FIG. 1). A regular hexagonal locking opening 44 is formed in the center, and three mounting holes 46 are formed in the outer peripheral edge portion at equal angular intervals in the circumferential direction. A substantially circular recess 48 is formed in the center of one side surface. A cylindrical wall 50 surrounding the locking opening 44 and extending somewhat in the axial direction is formed at a radial intermediate position of the recess 48, and an annular groove is formed between the cylindrical wall 50 and the outer peripheral edge of the recess 48. 52 is provided. A cylindrical projecting wall 54 that surrounds the locking opening 44 and projects slightly further in the axial direction is also formed at the radially intermediate portion of the extending end surface of the cylindrical wall 50. Here, the flange 8 is formed with a plurality of engaging claws 56 arranged at intervals in the circumferential direction. In the illustrated embodiment, three engaging claws 56 are arranged at equal angular intervals along the outer peripheral edge of the groove 52, and all of them project radially inward. Through holes 60 are formed on the outer side and the inner side of the base end portion 58 of the engaging claw 56 adjacent to the base end portion 58, respectively, and the base end portion 58 has a thin piece shape. Each of the through-holes 60 has a substantially rectangular cross-sectional shape, and the base end 58 and the portions adjacent to both ends thereof are also thin-walled pieces.
主に図６を参照して説明すると、内輪１０は金属製の軸状部材であって、正六角形の板状である係止突部６２と、係止突部６２の軸方向他端における外周縁から径方向外方に延出して外周が円形である環状の外側肩壁６４と、この外側肩壁６４の外周縁から軸方向他側に延出する筒壁６６とを備えている。係止突部６２の中央には円形の貫通穴が形成されており、筒壁６６の内側に連通している。内輪１０の内側の軸方向他端部には内径が最も大きい第一の部分６８が、軸方向中間部には第一の部分６８よりも内径が小さい第二の部分７０が、軸方向片端部には第二の部分７０よりも内径が小さい第三の部分７２が設けられており、第一の部分６８と第二の部分７０との間、第二の部分７０と第三の部分７２との間には夫々、軸方向に対して実質上垂直な円環形状の第一の内側肩壁面７４、第二の内側肩壁面７６が形成されている。内輪１０は、コイルばね１２が装着された状態で、係止突部６２をフランジ８の係止開口４４に嵌入することでフランジ８に固定される。コイルばね１２は、図７に示すとおり、線材を巻回して形成され、軸方向の両端には外方に曲げられたフック部７８が周方向の異なる位置に形成されている。図示の実施形態においては、コイルばね１２が自然状態、つまり図７に示す状態、にあっては両フック部７８の周方向間隔は略８０度であるが、コイルばね１２が内輪１０の外周面に装着されると図１のＢ−Ｂ断面図に示すとおり両フック部７８の周方向間隔は略１８０度になる。 Mainly referring to FIG. 6, the inner ring 10 is a metal shaft-shaped member, and is a regular hexagonal plate-shaped locking projection 62, and an outer side of the locking projection 62 at the other end in the axial direction. An annular outer shoulder wall 64 that extends radially outward from the peripheral edge and has a circular outer periphery, and a cylindrical wall 66 that extends axially to the other side from the outer peripheral edge of the outer shoulder wall 64 are provided. A circular through hole is formed in the center of the locking projection 62 and communicates with the inside of the cylindrical wall 66. A first portion 68 having the largest inner diameter is provided at the other axial end on the inner side of the inner ring 10, and a second portion 70 having an inner diameter smaller than that of the first portion 68 is provided at the axial middle end at one axial end. Is provided with a third portion 72 having an inner diameter smaller than that of the second portion 70, and between the first portion 68 and the second portion 70, the second portion 70 and the third portion 72 are provided. A first inner shoulder wall surface 74 and a second inner shoulder wall surface 76, which are annular and are substantially perpendicular to the axial direction, are formed between them. The inner ring 10 is fixed to the flange 8 by fitting the locking protrusion 62 into the locking opening 44 of the flange 8 with the coil spring 12 mounted. As shown in FIG. 7, the coil spring 12 is formed by winding a wire rod, and hook portions 78 bent outward are formed at both ends in the axial direction at different positions in the circumferential direction. In the illustrated embodiment, when the coil spring 12 is in the natural state, that is, in the state shown in FIG. 7, the intervals between the hook portions 78 in the circumferential direction are approximately 80 degrees, but the coil spring 12 forms the outer peripheral surface of the inner ring 10. When it is attached to the hook portion 78, the circumferential interval between the hook portions 78 becomes approximately 180 degrees as shown in the BB sectional view of FIG.
次に、主に図１を参照して、上記構成部品の組み合わせについて説明する。
出力部材６とフランジ８に固定された内輪１０とは、出力部材６の軸部材２７が内輪１０の内側に嵌入されることで組み合わされる。このとき、軸部材２７の基端部２８の外周面と内輪１０の第一の部分６８の内周面とが、軸部材２７の中間部３０の外周面と内輪１０の第二の部分７０の内周面とが、夫々径方向において対向して当接すると共に、軸部材２７の第一の肩壁３４と内輪１０の第一の内側肩壁面７４とが、軸部材２７の第二の肩壁３６と内輪１０の第二の内側肩壁面７６とが、夫々軸方向において対向して当接した状態で組み合わされる（図４及び図６も併せて参照されたい）。
Next, mainly referring to FIG. 1, a combination of the above-described components will be described.
The output member 6 and the inner ring 10 fixed to the flange 8 are assembled by fitting the shaft member 27 of the output member 6 inside the inner ring 10. At this time, the outer peripheral surface of the base end portion 28 of the shaft member 27 and the inner peripheral surface of the first portion 68 of the inner ring 10 are the outer peripheral surface of the intermediate portion 30 of the shaft member 27 and the second portion 70 of the inner ring 10. The inner peripheral surfaces are opposed to each other in the radial direction and are in contact with each other, and the first shoulder wall 34 of the shaft member 27 and the first inner shoulder wall surface 74 of the inner ring 10 are the second shoulder wall of the shaft member 27. 36 and the second inner shoulder wall surface 76 of the inner ring 10 are assembled in a state in which they face each other in the axial direction and are in contact with each other (see also FIGS. 4 and 6).
次いで、入力部材４とフランジ８とが組み合わされる。入力部材４とフランジ８とを組み合わせる際には、入力部材４の被係合爪２４とフランジ８の係合爪５６とを軸方向に整合した状態で、入力部材４をフランジ８に対して軸方向に強制する。これにより、被係合爪２４が係合爪５６を弾性的に乗り越えてこれに係合される。この際、図示の実施形態においては、係合爪５６の基端部５８の径方向外側及び内側には夫々基端部５８に隣接して貫通穴部６０が形成されており、基端部５８は薄肉片状にせしめられている。そのため、基端部５８は径方向に対して可撓性を有し、被係合爪２４は容易に係合爪５６を乗り越えてこれによって係合されることとなる。入力部材４とフランジ８とが組み合わされると、入力部材４の内側に閉塞された収容空間が画成され、この収容空間にコイルばね１２が装着された内輪１０が配置されることとなる。そして、入力部材４とフランジ８とが組み合わされた状態にあっては、筒壁１６の先端部は環状溝５２に嵌り込み、入力部材４はフランジ８に対して回転可能となる。このとき、入力部材４と出力部材６とは、図１のＢ−Ｂ断面図に示すとおり、入力係止片２２及び出力係止片４２は、周方向に２個の間隙８２が存在するよう、組み合わされて設置され、２個の間隙８２の夫々には、コイルばね１２の両端のフック部７８が挿入される。更に、入力端板１４と出力端板２６に形成された突条４１とが接触し、円筒壁１８の外周面と基端部２８の内周面とが径方向において対向して当接すると共に、円筒壁１８の延出端面と中間部３０の基端面とが軸方向において対向して当接する（図３及び図４も併せて参照されたい）。 Then, the input member 4 and the flange 8 are combined. When the input member 4 and the flange 8 are assembled, the input member 4 is axially aligned with the flange 8 with the engaged claw 24 of the input member 4 and the engaging claw 56 of the flange 8 aligned in the axial direction. Force in the direction. As a result, the engaged claw 24 elastically rides over the engaging claw 56 and is engaged with this. At this time, in the illustrated embodiment, through holes 60 are formed adjacent to the base end 58 on the radially outer side and the inner side of the base end 58 of the engaging claw 56, respectively. Is made into a thin piece. Therefore, the base end portion 58 has flexibility in the radial direction, and the engaged claw 24 easily gets over the engaging claw 56 and is engaged thereby. When the input member 4 and the flange 8 are combined, a closed accommodation space is defined inside the input member 4, and the inner ring 10 having the coil spring 12 mounted therein is arranged in the accommodation space. Then, when the input member 4 and the flange 8 are combined, the tip end portion of the cylindrical wall 16 is fitted into the annular groove 52, and the input member 4 is rotatable with respect to the flange 8. At this time, the input member 4 and the output member 6 are arranged such that the input locking piece 22 and the output locking piece 42 have two gaps 82 in the circumferential direction, as shown in the BB sectional view of FIG. The hook portions 78 at both ends of the coil spring 12 are inserted into each of the two gaps 82. Furthermore, the input end plate 14 and the projection 41 formed on the output end plate 26 contact each other, and the outer peripheral surface of the cylindrical wall 18 and the inner peripheral surface of the base end portion 28 contact each other in the radial direction so as to face each other. The extending end surface of the cylindrical wall 18 and the base end surface of the intermediate portion 30 are opposed to each other in the axial direction and are in contact with each other (see also FIGS. 3 and 4 ).
本発明のロックタイプ双方向クラッチにおいては、入力部材４は入力端板１４と、入力端板１４の周縁から延びる筒壁１６とを有し、筒壁１６とフランジ８とは係合手段（被係合爪２４と係合爪５６との係合）によって軸方向に係合され、入力部材４はフランジ８に対して回転可能な状態で組み合わされる。それ故に、本発明のロックタイプ双方向クラッチにあっては、従来はハウジングとシールド板によって画成されていた収容空間を、入力部材４と固定のフランジ８によって画成することが可能となり、実質的にシールド板を省略することが可能となる。これにより、本発明のロックタイプ双方向クラッチにあっては、部品点数の削減によって製造コストが低減されると共に、省略されたシールド板の厚み分だけ軸方向にコンパクトにすることが可能となる。 In the lock type two-way clutch of the present invention, the input member 4 has the input end plate 14 and the cylindrical wall 16 extending from the peripheral edge of the input end plate 14, and the cylindrical wall 16 and the flange 8 are engaged with each other by engaging means (a cover member). The input member 4 is rotatably combined with the flange 8 by being engaged in the axial direction by the engagement of the engaging claw 24 and the engaging claw 56. Therefore, in the lock type two-way clutch of the present invention, the accommodation space that was conventionally defined by the housing and the shield plate can be defined by the input member 4 and the fixed flange 8. It is possible to omit the shield plate. As a result, in the lock type bidirectional clutch of the present invention, it is possible to reduce the manufacturing cost by reducing the number of parts and to make the axial direction compact by the thickness of the omitted shield plate.
図１に示すとおりに組み合わされたロックタイプ双方向クラッチ２は、フランジ８の取付穴４６にボルトを挿通して図示しない被装着部材に固定される。ここで、本発明に従って構成されるロックタイプ双方向クラッチの上記被装着部材への固定方法は、フランジに形成された取付穴にボルトを挿通することに限定されない。例えば、図８において番号８ａで示されるフランジのように、外周にスプライン４６ａを設けると共に、被装着部材の所定位置に上記スプライン４６ａと対応するスプラインを設け、フランジ８ａと被装着部材とをスプライン嵌合により固定してもよい。また、図９において番号８ｂで示されるフランジのように、外周に周方向に間隔をおいて複数個の凹部４６ｂを設けると共に、被装着部材の所定位置に上記凹部４６ａと対応する凸部を設け、フランジ８ｂと被装着部材とを凹部４６ｂと凸部との嵌合により固定してもよい。 The lock type two-way clutch 2 combined as shown in FIG. 1 is fixed to a mounted member (not shown) by inserting bolts into the mounting holes 46 of the flange 8. Here, the method of fixing the lock type bidirectional clutch configured according to the present invention to the mounted member is not limited to inserting the bolt into the mounting hole formed in the flange. For example, as shown by the number 8a in FIG. 8, a spline 46a is provided on the outer circumference, and a spline corresponding to the spline 46a is provided at a predetermined position of the mounted member so that the flange 8a and the mounted member are spline-fitted. It may be fixed depending on the combination. Further, like a flange shown by reference numeral 8b in FIG. 9, a plurality of recesses 46b are provided on the outer periphery at intervals in the circumferential direction, and a projection corresponding to the recess 46a is provided at a predetermined position of the mounted member. The flange 8b and the mounted member may be fixed by fitting the concave portion 46b and the convex portion.
続いて、図１に示す双方向クラッチの作動について図１０及び図１１を参照して説明する。
図１０の中央の縦断面図の矢印に示すように、入力部材４が、例えば、駆動源のモーターにより回転軸ｏの周りを反時計方向（軸方向の左方から見て）に回転すると、入力部材４に形成された入力係止片２２も回転軸ｏの周りを同方向に回転する。回転軸ｏ周りに回転した入力係止片２２は、コイルばね１２の夫々の軸方向の一方の端部、即ち回転方向前方にあるコイルばね１２のフック部７８（Ｂ−Ｂ断面図において上側に示されるフック部７８）に当接し、フック部７８をばねの緩み方向に押して内輪１０に対するコイルばね１２の締付力を弱める。さらに、入力係止片２２は、夫々のフック部７８を介して出力係止片４２を押し、コイルばね１２の内輪１０に対する締付力を弱めながら出力係止片４２をコイルばね１２と共に回転させる。
Next, the operation of the bidirectional clutch shown in FIG. 1 will be described with reference to FIGS. 10 and 11.
As shown by the arrow in the longitudinal sectional view in the center of FIG. 10, when the input member 4 is rotated counterclockwise (as viewed from the left side in the axial direction) about the rotation axis o by the motor of the drive source, for example, The input locking piece 22 formed on the input member 4 also rotates around the rotation axis o in the same direction. The input locking pieces 22 rotated about the rotation axis o are arranged at one end of each coil spring 12 in the axial direction, that is, the hook portion 78 of the coil spring 12 located forward in the rotation direction (upward in the BB cross-sectional view). It abuts against the hook portion 78 shown) and pushes the hook portion 78 in the loosening direction of the spring to weaken the tightening force of the coil spring 12 against the inner ring 10. Further, the input locking pieces 22 push the output locking pieces 42 via the respective hook portions 78, and rotate the output locking pieces 42 together with the coil spring 12 while weakening the tightening force of the coil spring 12 with respect to the inner ring 10. ..
入力部材４が時計方向に回転すると、入力係止片２２は、コイルばね１２の軸方向の他方の端部にあるフック部７８（Ｂ−Ｂ断面図において下側に示されるフック部７８）に当接して、これを時計方向に押す。その力の方向は、やはり内輪１０に対するコイルばね１２の締付力を弱める方向であって、上述の場合と同じく、入力係止片２２は、出力係止片４２をコイルばね１２と共に時計方向に回転させる。このように、本発明のロックタイプ双方向クラッチでは、入力部材４が正・逆方向に回転すると、出力部材６が同一方向に等速で回転し、動力伝達が行われる。このとき、図示の実施形態においては、出力部材６と内輪１０とは、基端部２８の外周面と第一の部分６８の内周面とが、中間部３０の外周面と第二の部分７０の内周面とが、夫々径方向において対向して当接すると共に、第一の肩壁３４と第一の内側肩壁面７４とが、第二の肩壁３６と第二の内側肩壁面７６とが、夫々軸方向において対向して当接した状態で組み合わされているため、出力部材６は内輪１０によってラジアル方向及びスラスト方向に軸受されることとなり、出力部材６の回転が安定する。更に、入力部材４と出力部材６とは、入力端板１４と出力端板２６とが面接触し、円筒壁１８の外周面と基端部２８の内周面とが径方向において対向して当接すると共に、円筒壁１８の延出端面と中間部３０の基端面とが軸方向において対向して当接した状態で組み合わされているため、入力部材４は出力部材６によってラジアル方向及びスラスト方向に軸受されることとなり、入力部材４の回転も安定する。従って、回転の伝達中における入力軸２及び出力軸３の芯ぶれや振動が防止される。 When the input member 4 rotates in the clockwise direction, the input locking piece 22 is attached to the hook portion 78 (the hook portion 78 shown on the lower side in the BB sectional view) at the other end portion of the coil spring 12 in the axial direction. Abut and push it clockwise. The direction of the force is also a direction in which the tightening force of the coil spring 12 against the inner ring 10 is weakened, and similarly to the case described above, the input locking piece 22 moves the output locking piece 42 together with the coil spring 12 in the clockwise direction. Rotate. As described above, in the lock type bidirectional clutch of the present invention, when the input member 4 rotates in the forward and reverse directions, the output member 6 rotates in the same direction at a constant speed and power transmission is performed. At this time, in the illustrated embodiment, in the output member 6 and the inner ring 10, the outer peripheral surface of the base end portion 28 and the inner peripheral surface of the first portion 68 are the outer peripheral surface of the intermediate portion 30 and the second portion. The inner peripheral surface of 70 abuts against each other in the radial direction, and the first shoulder wall 34 and the first inner shoulder wall surface 74 are in contact with each other, and the second shoulder wall 36 and the second inner shoulder wall surface 76. Are combined so as to face each other in the axial direction and are in contact with each other, so that the output member 6 is supported by the inner ring 10 in the radial direction and the thrust direction, and the rotation of the output member 6 is stabilized. Further, in the input member 4 and the output member 6, the input end plate 14 and the output end plate 26 are in surface contact with each other, and the outer peripheral surface of the cylindrical wall 18 and the inner peripheral surface of the base end portion 28 face each other in the radial direction. Since the extending end surface of the cylindrical wall 18 and the base end surface of the intermediate portion 30 are combined in a state of abutting and abutting in the axial direction, the input member 4 is combined by the output member 6 in the radial direction and the thrust direction. Therefore, the rotation of the input member 4 is stabilized. Therefore, the runout and vibration of the input shaft 2 and the output shaft 3 during the transmission of the rotation are prevented.
一方、図１１の中央の縦断面図における矢印に示すように、出力部材６側からの回転トルクにより、出力部材６を回転軸ｏの周りに反時計方向（軸方向の右方から見て）に回転させようとしても、出力係止片４２がコイルばね１２のフック部７８（Ｂ−Ｂ断面図の上側に示されるフック部７８）をばねの締め方向に押して、内輪１０に対するコイルばね１２の締め付け力を強めるため、出力係止片４２は内輪１０に対して回転しない。この点は、出力部材６を時計方向（軸方向の右方から見て）に回転させようとした場合も同様である（このときは、出力係止片４２がＢ−Ｂ断面図の下側のフック部７８と当接）。従って、出力部材６からの入力部材４への回転の伝達は、出力部材６が回転不能となり遮断される。 On the other hand, as indicated by the arrow in the longitudinal sectional view in the center of FIG. 11, the output member 6 is rotated counterclockwise around the rotation axis o (as viewed from the right side in the axial direction) by the rotation torque from the output member 6 side. When the output locking piece 42 pushes the hook portion 78 of the coil spring 12 (the hook portion 78 shown on the upper side of the B-B cross-sectional view) in the spring tightening direction, the output locking piece 42 of the coil spring 12 with respect to the inner ring 10 rotates. Since the tightening force is increased, the output locking piece 42 does not rotate with respect to the inner ring 10. This point is the same when the output member 6 is rotated clockwise (as viewed from the right side in the axial direction) (in this case, the output locking piece 42 is on the lower side of the BB sectional view). Abuts on the hook portion 78). Therefore, the transmission of the rotation from the output member 6 to the input member 4 is blocked because the output member 6 cannot rotate.
以上詳述したように、本発明は、固定のフランジとこれに対して回転可能な入力部材とを組み合わせて画成される収容空間にコイルばねが装着された内輪を固定し、入力軸の回転時には、入力係止片がコイルばねのフック部をばねの緩み方向に押して、コイルばねと共に出力軸を回転させる一方、出力軸を回転させようとしても、出力係止片がコイルばねのフック部をばねの締め方向に押して、出力軸を回転不能にする、簡易なロックタイプ双方向クラッチを構成するものである。上記の実施形態においては、入力部材に形成された被係合爪が環状であって、ハウジングに形成された係合爪は周方向に間隔をおいて複数設けられていたが、これに替えて、上記被係合爪を周方向に間隔をおいて複数設けると共に、上記係合爪を環状にしてもよい。また、上記実施形態においては、入力係止片及び出力係止片は共に軸方向に延びる断面円弧状部材であって１個ずつ設けられていたが、これに替えて、入力係止片及び出力係止片の夫々を、周方向に間隔をおいて配置され軸方向に延びる一対の棒状部材から構成されるようにしてもよい。 As described in detail above, according to the present invention, the inner ring having the coil spring is fixed to the accommodation space defined by the combination of the fixed flange and the rotatable input member to rotate the input shaft. At times, the input locking piece pushes the hook part of the coil spring in the loosening direction of the spring to rotate the output shaft together with the coil spring. This is a simple lock type bidirectional clutch that pushes in the tightening direction of the spring to make the output shaft non-rotatable. In the embodiment described above, the engaged claws formed on the input member are annular, and the plurality of engaging claws formed on the housing are provided at intervals in the circumferential direction. A plurality of the engaged claws may be provided at intervals in the circumferential direction, and the engaging claws may be annular. Further, in the above-described embodiment, both the input locking piece and the output locking piece are arc-shaped members that extend in the axial direction and are provided one by one, but instead of this, the input locking piece and the output locking piece are provided. Each of the locking pieces may be composed of a pair of rod-shaped members arranged at intervals in the circumferential direction and extending in the axial direction.
２：ロックタイプ双方向クラッチ
４：入力部材
６：出力部材
８：フランジ
１０：内輪
１２：コイルばね
１４：入力端板
１６：筒壁
２４：被係合爪（係合手段）
２６：出力端板
４２：出力係止片
５２：環状溝
５６：係合爪（係合手段）
５８：基端部
６０：貫通穴部
７８：フック部
2: Lock type bidirectional clutch 4: Input member 6: Output member 8: Flange 10: Inner ring 12: Coil spring 14: Input end plate 16: Cylindrical wall 24: Engaged claw (engaging means)
26: Output end plate 42: Output locking piece 52: Annular groove 56: Engaging claw (engaging means)
58: Base End 60: Through Hole 78: Hook
即ち、本発明の第一の局面によれば、上記主たる技術的課題を達成するロックタイプ双方向クラッチとして、共通の回転軸を中心として回転可能な入力部材及び出力部材を備え、前記入力部材からの正・逆方向の回転は前記出力部材に伝達されると共に、前記出力部材からの前記入力部材への回転の伝達は、前記出力部材を回転不能として遮断されるロックタイプ双方向クラッチであって、
前記入力部材と組み合わされて閉塞された収容空間を画成する固定のフランジと、前記収容空間内において前記フランジに固定された軸状の内輪と、前記内輪に装着されたコイルばねとを備え、
前記入力部材は入力端板と、前記入力端板の周縁から延びる筒壁とを有し、前記筒壁と前記フランジとは係合手段によって軸方向に係合され、前記入力部材は前記フランジに対して回転可能であり、
前記係合手段は、前記筒壁の先端部において周方向に連続して延在する環状被係合爪と、前記フランジにおいて周方向に間隔をおいて配置された複数個の係合爪とから構成され、
前記コイルばねは、線材を巻回して形成され、軸方向の両端には外方に曲げられたフック部が周方向の異なる位置に形成され、内周面は前記内輪の外周面と接触し、
前記入力部材及び出力部材には軸方向に延びる入力係止片及び出力係止片が夫々形成され、前記入力係止片及び出力係止片は、周方向に２個の間隙が存在するよう、組み合わされて設置され、
前記２個の間隙の夫々には、前記コイルばねの両端のフック部が挿入され、
前記入力部材が回転したときは、前記入力係止片が前記コイルばねのフック部をばねの緩み方向に押して、前記コイルばねと共に前記出力部材を回転させ、前記出力部材に回転力を加えたときは、前記出力係止片が前記コイルばねのフック部をばねの締め方向に押して、前記出力部材が回転不能となる、ことを特徴とするロックタイプ双方向クラッチが提供される。
本発明の第一の局面にあっては、前記係合爪の基端部の径方向外側及び内側には夫々前記基端部に隣接して貫通穴部が形成されており、前記基端部は薄肉片状にせしめられているのがよい。
That is, according to the first aspect of the present invention , as a lock type bidirectional clutch that achieves the above-mentioned main technical problem, an input member and an output member rotatable about a common rotation shaft are provided, and Is a lock-type two-way clutch in which rotation in the forward and reverse directions is transmitted to the output member, and transmission of rotation from the output member to the input member is blocked by making the output member non-rotatable. ,
A fixed flange that defines a closed housing space in combination with the input member; a shaft-shaped inner ring fixed to the flange in the housing space; and a coil spring attached to the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate, the cylindrical wall and the flange are axially engaged by an engaging means, and the input member is attached to the flange. It can rotate with respect to
The engaging means includes an annular engaged claw that extends continuously in the circumferential direction at the tip end portion of the cylindrical wall, and a plurality of engaging claws that are arranged at intervals in the circumferential direction on the flange. Composed,
The coil spring is formed by winding a wire rod, and outwardly bent hook portions are formed at different positions in the circumferential direction at both ends in the axial direction, and the inner peripheral surface contacts the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hook portions at both ends of the coil spring are inserted into the two gaps,
When the input member rotates, when the input locking piece pushes the hook portion of the coil spring in the loosening direction of the spring to rotate the output member together with the coil spring, and applies a rotational force to the output member. The lock-type two-way clutch is characterized in that the output locking piece pushes the hook portion of the coil spring in the tightening direction of the spring, so that the output member cannot rotate.
In the first aspect of the present invention, a through hole portion is formed adjacent to the base end portion on the outer side and the inner side in the radial direction of the base end portion of the engaging claw, respectively. Is preferably made into thin pieces.
本発明の第二の局面によれば、共通の回転軸を中心として回転可能な入力部材及び出力部材を備え、前記入力部材からの正・逆方向の回転は前記出力部材に伝達されると共に、前記出力部材からの前記入力部材への回転の伝達は、前記出力部材を回転不能として遮断されるロックタイプ双方向クラッチであって、
前記入力部材と組み合わされて閉塞された収容空間を画成する固定のフランジと、前記収容空間内において前記フランジに固定された軸状の内輪と、前記内輪に装着されたコイルばねとを備え、
前記入力部材は入力端板と、前記入力端板の周縁から延びる筒壁とを有し、前記筒壁と前記フランジとは係合手段によって軸方向に係合され、前記入力部材は前記フランジに対して回転可能であり、
前記係合手段は、前記筒壁の先端部において周方向に間隔をおいて配置された複数個の被係合爪と、前記フランジにおいて周方向に連続して延在する環状係合爪とから構成され、
前記コイルばねは、線材を巻回して形成され、軸方向の両端には外方に曲げられたフック部が周方向の異なる位置に形成され、内周面は前記内輪の外周面と接触し、
前記入力部材及び出力部材には軸方向に延びる入力係止片及び出力係止片が夫々形成され、前記入力係止片及び出力係止片は、周方向に２個の間隙が存在するよう、組み合わされて設置され、
前記２個の間隙の夫々には、前記コイルばねの両端のフック部が挿入され、
前記入力部材が回転したときは、前記入力係止片が前記コイルばねのフック部をばねの緩み方向に押して、前記コイルばねと共に前記出力部材を回転させ、前記出力部材に回転力を加えたときは、前記出力係止片が前記コイルばねのフック部をばねの締め方向に押して、前記出力部材が回転不能となる、ことを特徴とするロックタイプ双方向クラッチが提供される。
本発明の第一の局面及び第二の局面にあっては、前記フランジには前記筒壁の先端部が嵌り込む環状溝が設けられ、該係合爪は前記溝の外周縁に沿って配置されているのがよい。好ましくは、前記入力係止片は前記筒壁の内周面に固着されている。好適には、前記入力係止片及び出力係止片は共に断面円弧状であって、１個ずつ形成されている。
According to a second aspect of the present invention, an input member and an output member rotatable about a common rotation axis are provided, and rotations in the forward and reverse directions from the input member are transmitted to the output member, The transmission of rotation from the output member to the input member is a lock type bidirectional clutch in which the output member is non-rotatably blocked.
A fixed flange that defines a closed housing space in combination with the input member; a shaft-shaped inner ring fixed to the flange in the housing space; and a coil spring attached to the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate, the cylindrical wall and the flange are axially engaged by an engaging means, and the input member is attached to the flange. It can rotate with respect to
The engaging means includes a plurality of engaged pawls arranged at intervals in the circumferential direction at the tip end portion of the cylindrical wall, and an annular engaging pawl extending continuously in the circumferential direction at the flange. Composed,
The coil spring is formed by winding a wire rod, and outwardly bent hook portions are formed at different positions in the circumferential direction at both ends in the axial direction, and the inner peripheral surface contacts the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hook portions at both ends of the coil spring are inserted into the two gaps,
When the input member rotates, when the input locking piece pushes the hook portion of the coil spring in the loosening direction of the spring to rotate the output member together with the coil spring, and applies a rotational force to the output member. The lock-type two-way clutch is characterized in that the output locking piece pushes the hook portion of the coil spring in the tightening direction of the spring, so that the output member cannot rotate.
In the first aspect and the second aspect of the present invention, the flange is provided with an annular groove into which the distal end portion of the cylindrical wall is fitted, and the engaging claw is arranged along the outer peripheral edge of the groove. Good to have been. Good Mashiku, the input locking piece is fixed to the inner peripheral surface of the tubular wall. Preferably, each of the input locking piece and the output locking piece has an arcuate cross section and is formed one by one.
主に図４を参照して説明すると、出力部材６は合成樹脂製であって、円環形状の出力端板２６を備えている。出力端板２６の片側面には、その内周縁部から軸方向片側に向かって延びる中空の軸部材２７が固着されている。軸部材２７は、大径円筒状の基端部２８と、中径円筒形状の中間部３０と、小径円筒形状部材の外周面の一部が切り欠かれた先端部３２とを備えている。基端部２８、中間部３０、及び先端部３２は同心状に軸方向に直列に配置されており、基端部２８と中間部３０との接続部、中間部３０と先端部３２との接続部には夫々、軸方向に対して実質上垂直な円環形状の第一の肩面３４、第二の肩面３６が形成されている。出力端板２６の片側面には更に、軸部材２７の付け根部分を囲繞する環状溝４０も形成されている。出力端板２６の他側面の外周縁部には、軸方向他側に僅かに突出した円環形状の突条４１が形成されている。出力部材６には更に、軸方向に延びる出力係止片４２も形成されている。図示の実施形態においては、出力係止片４２は断面円弧状であって周方向に１７０度の角度範囲に亘って延在し、出力端板２６の外周面に固着されている。出力係止片４２の基端と出力端板２６の端面（但し突条４１を除く）とは軸方向に見て整合している。出力係止片４２の周方向両端面は、径方向内側端部を除いて径方向に直線状に延びており、径方向内側端部はコイルばね１２の後述するフック部の基端部の形状と対応する弧状となっている。 Explaining mainly with reference to FIG. 4, the output member 6 is made of synthetic resin and includes an annular output end plate 26. A hollow shaft member 27 is fixed to one side surface of the output end plate 26 and extends from the inner peripheral edge portion thereof toward one side in the axial direction. The shaft member 27 includes a large-diameter cylindrical base end portion 28, a medium-diameter cylindrical intermediate portion 30, and a distal end portion 32 in which a part of the outer peripheral surface of the small-diameter cylindrical member is cut away. The proximal end portion 28, the intermediate portion 30, and the distal end portion 32 are concentrically arranged in series in the axial direction, and the connecting portion between the proximal end portion 28 and the intermediate portion 30 and the connection between the intermediate portion 30 and the distal end portion 32. A ring-shaped first shoulder surface 34 and a second shoulder surface 36, which are substantially perpendicular to the axial direction, are formed in the respective portions. An annular groove 40 that surrounds the root portion of the shaft member 27 is also formed on one side surface of the output end plate 26. On the outer peripheral edge of the other side surface of the output end plate 26, a ring-shaped protrusion 41 slightly protruding to the other side in the axial direction is formed. The output member 6 is further formed with an output locking piece 42 extending in the axial direction. In the illustrated embodiment, the output locking piece 42 has an arcuate cross section, extends in the circumferential direction over an angle range of 170 degrees, and is fixed to the outer peripheral surface of the output end plate 26. The base end of the output locking piece 42 and the end surface of the output end plate 26 (excluding the protrusion 41) are aligned when viewed in the axial direction. Both end surfaces in the circumferential direction of the output locking piece 42 extend linearly in the radial direction except for the inner end portion in the radial direction, and the inner end portion in the radial direction has a shape of a base end portion of a hook portion of the coil spring 12 described later. It has an arc shape corresponding to.
以上詳述したように、本発明は、固定のフランジとこれに対して回転可能な入力部材とを組み合わせて画成される収容空間にコイルばねが装着された内輪を固定し、入力軸の回転時には、入力係止片がコイルばねのフック部をばねの緩み方向に押して、コイルばねと共に出力軸を回転させる一方、出力軸を回転させようとしても、出力係止片がコイルばねのフック部をばねの締め方向に押して、出力軸を回転不能にする、簡易なロックタイプ双方向クラッチを構成するものである。上記の実施形態においては、入力部材に形成された被係合爪が環状であって、フランジに形成された係合爪は周方向に間隔をおいて複数設けられていたが、これに替えて、上記被係合爪を周方向に間隔をおいて複数設けると共に、上記係合爪を環状にしてもよい。また、上記実施形態においては、入力係止片及び出力係止片は共に軸方向に延びる断面円弧状部材であって１個ずつ設けられていたが、これに替えて、入力係止片及び出力係止片の夫々を、周方向に間隔をおいて配置され軸方向に延びる一対の棒状部材から構成されるようにしてもよい。 As described in detail above, according to the present invention, the inner ring having the coil spring is fixed to the accommodation space defined by the combination of the fixed flange and the rotatable input member to rotate the input shaft. At times, the input locking piece pushes the hook part of the coil spring in the loosening direction of the spring to rotate the output shaft together with the coil spring. This is a simple lock type bidirectional clutch that pushes in the tightening direction of the spring to make the output shaft non-rotatable. In the above embodiment, the engaged claws formed on the input member are annular, and the plurality of engaging claws formed on the flange are provided at intervals in the circumferential direction. A plurality of the engaged claws may be provided at intervals in the circumferential direction, and the engaging claws may be annular. Further, in the above-described embodiment, both the input locking piece and the output locking piece are arc-shaped members that extend in the axial direction and are provided one by one, but instead of this, the input locking piece and the output locking piece are provided. Each of the locking pieces may be composed of a pair of rod-shaped members arranged at intervals in the circumferential direction and extending in the axial direction.
Claims (6)
前記入力部材と組み合わされて閉塞された収容空間を画成する固定のフランジと、前記収容空間内において前記フランジに固定された軸状の内輪と、前記内輪に装着されたコイルばねとを備え、
前記入力部材は入力端板と、前記入力端板の周縁から延びる筒壁とを有し、前記筒壁と前記フランジとは係合手段によって軸方向に係合され、前記入力部材は前記フランジに対して回転可能であり、
前記コイルばねは、線材を巻回して形成され、軸方向の両端には外方に曲げられたフック部が周方向の異なる位置に形成され、内周面は前記内輪の外周面と接触し、
前記入力部材及び出力部材には軸方向に延びる入力係止片及び出力係止片が夫々形成され、前記入力係止片及び出力係止片は、周方向に２個の間隙が存在するよう、組み合わされて設置され、
前記２個の間隙の夫々には、前記コイルばねの両端のフック部が挿入され、
前記入力部材が回転したときは、前記入力係止片が前記コイルばねのフック部をばねの緩み方向に押して、前記コイルばねと共に前記出力部材を回転させ、前記出力部材に回転力を加えたときは、前記出力係止片が前記コイルばねのフック部をばねの締め方向に押して、前記出力部材が回転不能となる、ことを特徴とするロックタイプ双方向クラッチ。 An input member and an output member rotatable about a common rotation axis are provided, and rotations in normal and reverse directions from the input member are transmitted to the output member and rotation from the output member to the input member. The transmission of is a lock type two-way clutch in which the output member is non-rotatably cut off,
A fixed flange that defines a closed housing space in combination with the input member; a shaft-shaped inner ring fixed to the flange in the housing space; and a coil spring attached to the inner ring,
The input member has an input end plate and a cylindrical wall extending from a peripheral edge of the input end plate, the cylindrical wall and the flange are axially engaged by an engaging means, and the input member is attached to the flange. It can rotate with respect to
The coil spring is formed by winding a wire rod, and outwardly bent hook portions are formed at different positions in the circumferential direction at both ends in the axial direction, and the inner peripheral surface contacts the outer peripheral surface of the inner ring,
An input locking piece and an output locking piece extending in the axial direction are respectively formed on the input member and the output member, and the input locking piece and the output locking piece have two gaps in the circumferential direction. Installed in combination,
Hook portions at both ends of the coil spring are inserted into the two gaps,
When the input member rotates, when the input locking piece pushes the hook portion of the coil spring in the loosening direction of the spring to rotate the output member together with the coil spring, and applies a rotational force to the output member. Is a lock type two-way clutch, wherein the output locking piece pushes a hook portion of the coil spring in a tightening direction of the spring to render the output member unrotatable.
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| JP2007092801A (en) * | 2005-09-27 | 2007-04-12 | Advics:Kk | One way clutch and electric parking brake device using it |
| JP2014029164A (en) * | 2012-07-31 | 2014-02-13 | Ogura Clutch Co Ltd | Power transmission device |
| JP2016020722A (en) * | 2014-07-15 | 2016-02-04 | Ntn株式会社 | Reverse input block clutch |
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| JP2007092801A (en) * | 2005-09-27 | 2007-04-12 | Advics:Kk | One way clutch and electric parking brake device using it |
| JP2014029164A (en) * | 2012-07-31 | 2014-02-13 | Ogura Clutch Co Ltd | Power transmission device |
| JP2016020722A (en) * | 2014-07-15 | 2016-02-04 | Ntn株式会社 | Reverse input block clutch |
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