JP2022032651A - Lock type bidirectional clutch - Google Patents

Abstract

To provide a novel lock type bidirectional clutch having an input lock segment and an output lock segment which are hard to break even when a large rotational torque is applied, and having a large allowance of the rotational torque applied to the whole device.SOLUTION: An input support shaft 12 and an output support shaft 24 having a circular cross-sectional shape and extending along a common rotational axis o are formed on an input member 4 and an output member 6, respectively. A required angular region of an outer peripheral surface of each of the input support shaft 12 and the output support shaft 24 is locally biased outward in a radial direction such that root end portions 14 and 26 of an input lock segment 8 and an output lock segment 22 are formed.SELECTED DRAWING: Figure 1

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ロックタイプ双方向クラッチに関する。 The present invention is a clutch device that changes the power transmission state between the input member and the output member, in particular, the forward / reverse rotation power from the input member (drive side) is transmitted, and the power is transmitted from the output member (driven side). The power transmission is related to a lock type bidirectional clutch that shuts off the output member as non-rotatable.

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、物品が所定の位置となったとき、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ような作動が求められる場合がある。そのため、入力軸（入力部材）及び出力軸（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、入力軸を正・逆回転可能なモーターに連結するとともに、出力軸の回転により物品を昇降させる装置が知られている。この装置の双方向クラッチでは、モーターにより入力軸を正・逆回転したときは、出力軸が連動して正・逆回転し物品を昇降させる一方、出力軸を正・逆回転しようとすると、出力軸がロックされた状態となって物品の落下を防止する。 In a power transmission system that drives work equipment from a drive source such as a motor, for example, an elevating device that moves an article up and down by a motor, when the article is in a predetermined position, the article is automatically stopped when the motor is stopped. An operation that holds the position may be required. Therefore, using a lock-type bidirectional clutch equipped with an input shaft (input member) and an output shaft (output member), the input shaft is connected to a motor that can rotate forward and reverse, and the article is rotated by the rotation of the output shaft. Devices for raising and lowering are known. In the bidirectional clutch of this device, when the input shaft is rotated forward / reverse by the motor, the output shaft is linked to rotate forward / reverse to raise and lower the article, while when the output shaft is rotated forward / reverse, the output is output. The shaft is locked to prevent the article from falling.

下記特許文献１には、上述したとおりのロックタイプ双方向クラッチの一例が開示されている、かかるロックタイプ双方向クラッチにあっては、入力部材及び出力部材は軸方向に延びる入力係止片及び出力係止片を夫々備えており、入力係止片及び出力係止片は断面円形の内部空間を備えたハウジング内において周方向に２個の間隙が存在するよう組み合わせて配置されている。ハウジングの内周面には線材を巻回して形成されたコイルばねが装着され、コイルばねの軸方向の両端には線材が内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ており、コイルばねの両端のフック部は２個の間隙の夫々に挿入されている。そして、入力部材が回転したときは、入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、コイルばねと共に出力部材を回転させるが、出力部材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緩め方向に押して、出力部材が回転不能となる。 The following Patent Document 1 discloses an example of a lock type bidirectional clutch as described above. In such a lock type bidirectional clutch, the input member and the output member are an input locking piece extending in the axial direction and an input locking piece. Each of the output locking pieces is provided, and the input locking piece and the output locking piece are arranged in combination so as to have two gaps in the circumferential direction in a housing having an internal space having a circular cross section. A coil spring formed by winding a wire is mounted on the inner peripheral surface of the housing, and hook portions in which the wire is bent inward are formed at different positions in the circumferential direction at both ends of the coil spring in the axial direction. The hooks at both ends of the coil spring are inserted into each of the two gaps. Then, when the input member rotates, the input locking piece pushes the hook portion of the coil spring in the tightening direction of the spring to rotate the output member together with the coil spring, but even if the output member is rotated, the output is locked. The piece pushes the hook portion of the coil spring in the loosening direction of the spring, and the output member becomes non-rotatable.

特開２００７－９２８０１号公報Japanese Unexamined Patent Publication No. 2007-92801

而して、特許文献１に開示された従来のロックタイプ双方向クラッチにあっては、入力係止片は共通の回転軸に対して垂直な入力板から軸方向に延出しており固定端である入力板からの軸方向長さは比較的長いため、入力係止片の先端側でコイルばねのフック部を押す際には入力係止片に大きな回転モーメントが付加され、それ故に、大きな回転トルクを入力部材から出力部材に伝達しようとすると、入力係止片が上記回転モーメントにより倒れて（破損して）しまう虞がある。 Therefore, in the conventional lock type bidirectional clutch disclosed in Patent Document 1, the input locking piece extends axially from the input plate perpendicular to the common rotation axis and is at a fixed end. Since the axial length from a certain input plate is relatively long, a large rotational moment is applied to the input locking piece when pushing the hook part of the coil spring on the tip side of the input locking piece, and therefore a large rotation. When an attempt is made to transmit torque from the input member to the output member, the input locking piece may fall (damage) due to the rotational moment.

この点、特許文献１に開示された従来のロックタイプ双方向クラッチにあっては、出力部材には共通の回転軸に沿って延びる断面円形の出力支持軸が形成され、出力係止片はその全体が出力支持軸の外周面の所要角度領域を局所的に径方向外方に偏倚させることで形成されており、後述するとおりの理由により倒れにくい。しかしながら、入力係止片は入力板を固定端とした所謂片持ち梁状態であるため倒れやすく、装置全体にかかる回転トルクの許容値は入力係止片が倒れることのない比較的小さなトルク値に制限されてしまう。 In this regard, in the conventional lock type bidirectional clutch disclosed in Patent Document 1, an output support shaft having a circular cross section extending along a common rotation axis is formed on the output member, and the output locking piece is the output locking piece. The whole is formed by locally deviating the required angle region of the outer peripheral surface of the output support shaft radially outward, and it is difficult to fall down for the reason described later. However, since the input locking piece is in a so-called cantilever state with the input plate as a fixed end, it easily falls, and the allowable value of the rotational torque applied to the entire device is a relatively small torque value at which the input locking piece does not fall. It will be limited.

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、大きな回転トルクが付加されても入力係止片及び出力係止片が破損しにくく、装置全体にかかる回転トルクの許容値が大きい、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 that the input locking piece and the output locking piece are not easily damaged even when a large rotational torque is applied, and the rotational torque applied to the entire apparatus is reduced. It is to provide a new and improved lock type bidirectional clutch with a large tolerance.

本発明者は、鋭意検討の結果、共通の回転軸に沿って延びる断面円形の入力支持軸及び出力支持軸を入力部材及び出力部材に夫々設け、入力支持軸及び出力支持軸の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させて入力係止片及び出力係止片の基端部を構成することで上記主たる技術的課題を解決することができることを見出した。 As a result of diligent studies, the present inventor has provided an input support shaft and an output support shaft having a circular cross section extending along a common rotation axis on the input member and the output member, respectively, and the outer peripheral surfaces of the input support shaft and the output support shaft, respectively. It has been found that the above-mentioned main technical problem can be solved by constructing the base end portions of the input locking piece and the output locking piece by locally deviating the required angle region of the above in the radial direction.

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、
前記入力部材及び前記出力部材は軸方向に延びる入力係止片及び出力係止片を夫々備えており、前記入力係止片及び前記出力係止片は断面円形の内部空間を備えたハウジング内において周方向に２個の間隙が存在するよう組み合わせて配置されており、
前記ハウジングの内周面には線材を巻回して形成されたコイルばねが装着され、前記コイルばねの軸方向の両端には前記線材が内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ており、前記コイルばねの両端の前記フック部は前記２個の間隙の夫々に挿入され、
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前記フック部をばねの締め方向に押して、前記コイルばねと共に前記出力部材を回転させるが、前記出力部材を回転させようとしても、前記出力係止片が前記コイルばねの前記フック部をばねの緩め方向に押して、前記出力部材が回転不能となるロックタイプ双方向クラッチにおいて、
前記入力部材及び前記出力部材は前記共通の回転軸に沿って延びる断面円形の入力支持軸及び出力支持軸を夫々備えており、
前記入力係止片及び前記出力係止片は前記入力支持軸及び前記出力支持軸の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させた基端部を備えている、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 problem, an input member and an output member that can rotate around a common rotation axis are provided, and forward / reverse directions from the input member. The rotation of the output member is transmitted to the output member, and the rotation transmission from the output member to the input member is a lock type bidirectional clutch that shuts off the output member as non-rotatable.
The input member and the output member each include an input locking piece and an output locking piece extending in the axial direction, and the input locking piece and the output locking piece are in a housing having an internal space having a circular cross section. They are arranged in combination so that there are two gaps in the circumferential direction.
A coil spring formed by winding a wire rod is mounted on the inner peripheral surface of the housing, and hook portions in which the wire rod is bent inward are located at different positions in the circumferential direction at both ends of the coil spring in the axial direction. The hook portions at both ends of the coil spring are inserted into the two gaps, respectively.
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in the tightening direction of the spring to rotate the output member together with the coil spring, but attempts to rotate the output member. Also, in a lock type bidirectional clutch in which the output locking piece pushes the hook portion of the coil spring in the loosening direction of the spring and the output member becomes non-rotatable.
The input member and the output member each include an input support shaft and an output support shaft having a circular cross section extending along the common rotation axis.
The input locking piece and the output locking piece include a proximal end portion in which the required angle regions of the outer peripheral surfaces of the input support shaft and the output support shaft are locally displaced outward in the radial direction. A lock type bidirectional clutch characterized by that is provided.

好ましくは、前記入力支持軸及び前記出力支持軸の軸方向端面は、軸方向に見て前記コイルばねの両端の前記フック部の中間で相互に当接する。前記出力支持軸は円筒形状であって、前記出力支持軸の内側には、前記入力支持軸の軸方向端面に形成された前記共通の回転軸と同心の嵌合軸が相対回転可能に挿入されているのがよい。好適には、前記コイルばねの軸方向の両端に形成された前記フック部は、前記ハウジング内において直径方向に対向して位置する。前記ハウジングの内周面には径方向内側に突出する円環形状の片側支持片が、前記入力係止片の外周面には径方向外方に延びる円弧形状の他側支持片が夫々形成されており、前記コイルばねは前記片側支持片及び前記他側支持片によって軸方向に支持されているのが好適である。前記入力部材は比較的軟質の合成樹脂製で、前記出力部材は比較的硬質の合成樹脂製であるのが良い。前記入力係止片及び前記出力係止片の断面は共に円弧形状であるのが好ましい。 Preferably, the axial end faces of the input support shaft and the output support shaft abut against each other in the middle of the hook portions at both ends of the coil spring when viewed in the axial direction. The output support shaft has a cylindrical shape, and a fitting shaft concentric with the common rotation shaft formed on the axial end surface of the input support shaft is inserted into the inside of the output support shaft so as to be relatively rotatable. It is good to have. Preferably, the hook portions formed at both ends of the coil spring in the axial direction are located in the housing so as to face each other in the radial direction. An annular-shaped one-sided support piece protruding inward in the radial direction is formed on the inner peripheral surface of the housing, and an arc-shaped other-side support piece extending outward in the radial direction is formed on the outer peripheral surface of the input locking piece. It is preferable that the coil spring is axially supported by the one-side support piece and the other-side support piece. It is preferable that the input member is made of a relatively soft synthetic resin and the output member is made of a relatively hard synthetic resin. It is preferable that the cross sections of the input locking piece and the output locking piece are both arcuate.

本発明のロックタイプ双方向クラッチによれば、共通の回転軸に沿って延びる断面円形の入力支持軸及び出力支持軸の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させて入力係止片及び出力係止片の基端部が構成されている、つまり入力係止片及び出力係止片の基端部はその全体が入力支持軸及び出力支持軸と一体であってこれらに固定されていることに起因して、入力係止片及び出力係止片における固定端からの軸方向長さは短縮される。これにより、入力係止片及び出力係止片が夫々の先端側でコイルばねのフック部を押す際には、入力係止片及び出力係止片が受ける回転モーメントはその腕の長さが短縮されたことに起因して減少し、入力係止片及び出力係止片が倒れることは防止される。従って、装置全体にかかる回転トルクの許容値は大きくなる。 According to the lock type bidirectional clutch of the present invention, the required angle region of each outer peripheral surface of the input support shaft and the output support shaft having a circular cross section extending along a common rotation axis is locally displaced outward in the radial direction. The base end portion of the input locking piece and the output locking piece is configured, that is, the base end portion of the input locking piece and the output locking piece is integrally integrated with the input support shaft and the output support shaft. Due to being fixed to these, the axial length of the input locking piece and the output locking piece from the fixed end is shortened. As a result, when the input locking piece and the output locking piece push the hook portion of the coil spring on the tip side of each, the rotation moment received by the input locking piece and the output locking piece shortens the length of the arm. It is reduced due to the fact that the input locking piece and the output locking piece are prevented from falling. Therefore, the permissible value of the rotational torque applied to the entire device becomes large.

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の全体構成を示す図。The figure which shows the whole structure of the preferable embodiment of the lock type bidirectional clutch configured according to this invention. 図１に示すロックタイプ双方向クラッチの分解斜視図。An exploded perspective view of the lock type bidirectional clutch shown in FIG. 1. 図１に示すロックタイプ双方向クラッチの入力部材を単体で示す図。The figure which shows the input member of the lock type bidirectional clutch shown in FIG. 1 by itself. 図１に示すロックタイプ双方向クラッチの出力部材を単体で示す図。The figure which shows the output member of the lock type bidirectional clutch shown in FIG. 1 by itself. 図１に示すロックタイプ双方向クラッチのハウジング本体を単体で示す図。The figure which shows the housing body of the lock type bidirectional clutch shown in FIG. 1 alone. 図１に示すロックタイプ双方向クラッチのシールドを単体で示す図。The figure which shows the shield of the lock type bidirectional clutch shown in FIG. 1 by itself. 図１に示すロックタイプ双方向クラッチの作動を説明するための図。The figure for demonstrating the operation of the lock type bidirectional clutch shown in FIG.

以下、本発明に従って構成されたフリータイプ双方向クラッチの好適実施形態について添付図面を参照して、更に詳細に説明する。 Hereinafter, preferred embodiments of the free-type bidirectional clutch configured 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で示すフリータイプ双方向クラッチは、共通の回転軸ｏを中心として回転可能な入力部材４及び出力部材６を備えている。ここで、以下の説明における「軸方向片側」及び「軸方向他側」とは、特に指定しない限り、図１のＡ－Ａ断面及びＢ－Ｂ断面に示される状態を基準として、「軸方向片側」は同図において左側を、「軸方向他側」は同図において右側のことを言う。 Explaining with reference to FIGS. 1 and 2, the free-type bidirectional clutch, which is configured according to the present invention and is indicated by a number 2, has an input member 4 and an output member 6 that can rotate about a common rotation axis o. It is equipped with. Here, "one side in the axial direction" and "the other side in the axial direction" in the following description are referred to as "axial direction" with reference to the states shown in the AA cross section and the BB cross section of FIG. 1 unless otherwise specified. "One side" means the left side in the figure, and "axial direction the other side" means the right side in the figure.

図１及び図２と共に図３を参照して説明すると、入力部材４は比較的軟質の合成樹脂により成形され、軸方向に延びる入力係止片８を備えている。図示の実施形態においては、入力係止片８は、断面が円弧形状である単一の板状片である。入力係止片８の軸方向他側端部には径方向外方に延びる円弧形状の他側支持片１０が形成されている。他側支持片１０については後に言及する。入力部材４は共通の回転軸ｏに沿って延びる断面円形の入力支持軸１２をも備えており、入力係止片８の基端部１４は、入力支持軸１２の外周面の所要角度領域を局所的に径方向外方に偏倚させて構成されている。つまり、入力係止片８の基端部１４はその全体が入力支持軸１２と一体でありこれに固定されている（図３の下段Ｂ－Ｂ断面も参照されたい）。図示の実施形態においては、入力支持軸１２は円筒形状であって内側には軸方向に延びる入力貫通穴１６が規定されている。図３の上段左右側面及び下段Ｂ－Ｂ断面を参照することによって理解されるとおり、入力貫通穴１６の断面は、軸方向片側端部のみが円形であって、軸方向片側端部を除く部分はＤ字形である。入力貫通穴１６には図示しないモーターの如き駆動源から延びるシャフトが挿通され、入力部材４は駆動源に接続される。入力支持軸１２の軸方向他側端面には、入力貫通穴１６の軸方向他端の外周縁を囲繞して軸方向に延びる円筒形状の嵌合軸１８が形成されている。嵌合軸１８の外径は入力支持軸１２の外径よりも小さく、嵌合軸１８の延出端は軸方向に見て入力係止片８の延出端と整合している。一方、入力支持軸１２の軸方向片側端面には、入力貫通穴１６の軸方向片側端の外周縁を囲繞して軸方向に突出する円環形状の回転被支持部２０が形成されている。回転被支持部２０の外径は入力支持軸１２の外径よりも小さい。 Explaining with reference to FIG. 3 together with FIGS. 1 and 2, the input member 4 is formed of a relatively soft synthetic resin and includes an input locking piece 8 extending in the axial direction. In the illustrated embodiment, the input locking piece 8 is a single plate-shaped piece having an arcuate cross section. An arc-shaped other side support piece 10 extending radially outward is formed at the axially other side end portion of the input locking piece 8. The other side support piece 10 will be described later. The input member 4 also includes an input support shaft 12 having a circular cross section extending along a common rotation axis o, and the base end portion 14 of the input locking piece 8 covers a required angle region of the outer peripheral surface of the input support shaft 12. It is configured to be locally biased outward in the radial direction. That is, the base end portion 14 of the input locking piece 8 is integrally integrated with the input support shaft 12 and is fixed to the base end portion 14 (see also the lower BB cross section of FIG. 3). In the illustrated embodiment, the input support shaft 12 has a cylindrical shape, and an input through hole 16 extending in the axial direction is defined inside. As can be understood by referring to the upper left and right side surfaces and the lower BB cross section of FIG. 3, the cross section of the input through hole 16 is a portion in which only one side end in the axial direction is circular and one end in the axial direction is excluded. Is D-shaped. A shaft extending from a drive source such as a motor (not shown) is inserted into the input through hole 16, and the input member 4 is connected to the drive source. A cylindrical fitting shaft 18 extending in the axial direction is formed on the other end surface of the input support shaft 12 in the axial direction so as to surround the outer peripheral edge of the other end in the axial direction of the input through hole 16. The outer diameter of the fitting shaft 18 is smaller than the outer diameter of the input support shaft 12, and the extending end of the fitting shaft 18 is aligned with the extending end of the input locking piece 8 when viewed in the axial direction. On the other hand, on the axial one-sided end surface of the input support shaft 12, a ring-shaped rotationally supported portion 20 is formed so as to surround the outer peripheral edge of the axial one-side end of the input through hole 16 and project in the axial direction. The outer diameter of the rotationally supported portion 20 is smaller than the outer diameter of the input support shaft 12.

図１及び図２と共に図４を参照して説明すると、出力部材６は比較的硬質の合成樹脂により成形され、軸方向に延びる出力係止片２２を備えている。図示の実施形態においては、出力係止片２２は、断面が円弧形状である単一の板状片である。出力係止片２２と入力係止片８との位置関係については後述する。出力部材６は共通の回転軸ｏに沿って延びる断面円形の出力支持軸２４をも備えており、出力係止片２２の基端部２６は、出力支持軸２４の外周面の所要角度領域を局所的に径方向外方に偏倚させて構成されている。つまり、出力係止片２２の基端部２６はその全体が出力支持軸２４と一体でありこれに固定されている（図４の下段Ａ－Ａ断面も参照されたい）。図示の実施形態においては、出力支持軸２４は円筒形状であって、軸方向片側は開放されて内側には入力部材４の嵌合軸１８が挿通されている。図１のＡ－Ａ断面及びＢ－Ｂ断面に示すとおり、出力支持軸２４の軸方片側向端面は入力支持軸１２の軸方向他側端面と当接し、かかる当接位置は軸方向に見て後述するコイルばねの両端に設けられたフック部の中間である。一方、出力支持軸２４の軸方向他側は軸方向に延びる出力軸部２８により閉塞されている。出力軸部２８の延出端部の断面形状は非円形であって、これは図示しない昇降装置の如き従動部材に接続される。出力支持軸２４の軸方向他側端部の外周面には、径方向外方に延びる円環形状の出力フランジ３０が形成されており、出力係止片２２の軸方向他側端は出力フランジ３０に接続されている。 Explaining with reference to FIG. 4 together with FIGS. 1 and 2, the output member 6 is formed of a relatively hard synthetic resin and includes an output locking piece 22 extending in the axial direction. In the illustrated embodiment, the output locking piece 22 is a single plate-shaped piece having an arcuate cross section. The positional relationship between the output locking piece 22 and the input locking piece 8 will be described later. The output member 6 also includes an output support shaft 24 having a circular cross section extending along a common rotation axis o, and the base end portion 26 of the output locking piece 22 covers a required angle region of the outer peripheral surface of the output support shaft 24. It is configured to be locally biased outward in the radial direction. That is, the base end portion 26 of the output locking piece 22 is integrally integrated with the output support shaft 24 and is fixed to the base end portion 26 (see also the lower section AA in FIG. 4). In the illustrated embodiment, the output support shaft 24 has a cylindrical shape, one side in the axial direction is open, and the fitting shaft 18 of the input member 4 is inserted inside. As shown in the AA cross section and the BB cross section of FIG. 1, the axial one-sided end surface of the output support shaft 24 abuts on the other axial end surface of the input support shaft 12, and the contact position is viewed in the axial direction. It is in the middle of the hook portions provided at both ends of the coil spring, which will be described later. On the other hand, the other side of the output support shaft 24 in the axial direction is closed by the output shaft portion 28 extending in the axial direction. The cross-sectional shape of the extending end of the output shaft 28 is non-circular, which is connected to a driven member such as an elevating device (not shown). An annular output flange 30 extending radially outward is formed on the outer peripheral surface of the other end in the axial direction of the output support shaft 24, and the other end in the axial direction of the output locking piece 22 is an output flange. It is connected to 30.

ここで、入力部材４の入力係止片８及び出力部材６の出力係止片２２は、図１のＣ－Ｃ断面に示すとおり、後述するハウジング内において周方向に２個の間隙３１が存在するよう組み合わせて配置される。入力係止片８及び出力係止片２２が上記のとおりに組み合わされて配置されると、入力係止片８における基端部１４を除く部分の内周面は出力部材６の出力支持軸２４の外周面と、出力係止片２２における基端部２６を除く部分の内周面は入力部材４の入力支持軸１２外周面と夫々摺動自在に対向する。 Here, as shown in the CC cross section of FIG. 1, the input locking piece 8 of the input member 4 and the output locking piece 22 of the output member 6 have two gaps 31 in the circumferential direction in the housing described later. They are arranged in combination so that they do. When the input locking piece 8 and the output locking piece 22 are arranged in combination as described above, the inner peripheral surface of the portion of the input locking piece 8 other than the base end portion 14 is the output support shaft 24 of the output member 6. The outer peripheral surface of the output locking piece 22 and the inner peripheral surface of the portion of the output locking piece 22 other than the base end portion 26 slidably face the outer peripheral surface of the input support shaft 12 of the input member 4.

上述したとおり、入力係止片８及び出力係止片２２はハウジング３２に収容されている。ハウジング３２は図５に示すハウジング本体３４と図６に示すシールド３５とから構成されている。図１及び図２と共に図５を参照して説明すると、ハウジング本体３４は合成樹脂製であって、共通の回転軸ｏに対して垂直に配置される円形の端板３６及び端板３６の外周縁から軸方向に延びる円筒形状の外周壁３８を備えたカップ形状である。端板３６の中央には入力部材４の回転被支持部２０が挿入されてこれを回転可能に支持する軸穴４０が形成されている。端板３６には軸穴４０の外周縁を囲繞してハウジング本体３４の内側に向かって軸方向に僅かに突出する円環形状の支持突条４２も形成されている。支持突条４２は後述するとおりにして入力係止片８及び出力係止片２２が組み合わされて設置された際に、入力支持軸１２の軸方向片側端面と共に、入力係止片８の基端面及び出力係止片２２の延出端面の夫々（つまり夫々の軸方向片側端面）の内周縁部を支持する。端板３６の外周面には径方向外方に突出する一対の耳部４４が設けられている。一対の耳部４４の各々には軸方向に貫通する固定穴４６が形成されており、固定穴４６にボルトの如き図示しない適宜の固定具を挿通することでハウジング本体３４は壁等に固定される。外周壁３８の内側には断面円形の内部空間４８が規定されており、この内部空間４８に入力係止片８及び出力係止片２２は配置される。外周壁３８の内周面における軸方向片側（閉塞側）端部には径方向内側に突出する円環形状の片側支持片５０が形成されている。片側支持片５０は端板３６にも接続されている。外周壁３８の内周面における軸方向他側（開放側）端部には、シールド３５が嵌り込む周状の装着溝５２が設けられている。装着溝５２には周方向に等角度間隔をおいて３つの没入部５４が形成されており、夫々の没入部５４には、装着溝５２に嵌り込んだシールド３５を嵌合固定するための嵌合凹部５６が設けられている。 As described above, the input locking piece 8 and the output locking piece 22 are housed in the housing 32. The housing 32 is composed of a housing body 34 shown in FIG. 5 and a shield 35 shown in FIG. Explaining with reference to FIG. 5 together with FIGS. 1 and 2, the housing main body 34 is made of synthetic resin, and is outside the circular end plate 36 and the end plate 36 arranged perpendicular to the common rotation axis o. It is a cup shape with a cylindrical outer peripheral wall 38 extending in the axial direction from the peripheral edge. A rotary supported portion 20 of the input member 4 is inserted in the center of the end plate 36, and a shaft hole 40 is formed to rotatably support the portion. The end plate 36 is also formed with an annular support ridge 42 that surrounds the outer peripheral edge of the shaft hole 40 and slightly protrudes in the axial direction toward the inside of the housing body 34. When the input locking piece 8 and the output locking piece 22 are installed in combination as described later, the support ridge 42 is installed together with the axial one-sided end surface of the input support shaft 12 and the base end surface of the input locking piece 8. And the inner peripheral edge of each of the extended end faces of the output locking piece 22 (that is, each axial one-sided end face) is supported. A pair of selvages 44 projecting outward in the radial direction are provided on the outer peripheral surface of the end plate 36. A fixing hole 46 penetrating in the axial direction is formed in each of the pair of ear portions 44, and the housing body 34 is fixed to a wall or the like by inserting an appropriate fixing tool such as a bolt (not shown) into the fixing hole 46. To. An internal space 48 having a circular cross section is defined inside the outer peripheral wall 38, and the input locking piece 8 and the output locking piece 22 are arranged in this internal space 48. An annular-shaped one-sided support piece 50 projecting inward in the radial direction is formed at the one-sided (closed-sided) end in the axial direction on the inner peripheral surface of the outer peripheral wall 38. The one-side support piece 50 is also connected to the end plate 36. A circumferential mounting groove 52 into which the shield 35 is fitted is provided at the end on the other side (open side) in the axial direction on the inner peripheral surface of the outer peripheral wall 38. Three immersion portions 54 are formed in the mounting groove 52 at equal intervals in the circumferential direction, and each immersion portion 54 is fitted to fit and fix the shield 35 fitted in the mounting groove 52. A joint recess 56 is provided.

図１及び図２と共に図６を参照して説明すると、シールド３５は合成樹脂製であって円板形状のシールド主部５８を備えている。シールド主部５８の中央には、出力部材６の出力軸部２８が挿通されてこれを回転可能に支持する軸穴６０が形成されている。シールド主部５８の軸方向片側面（内部空間４８を臨む側の面）の外周縁部には周方向に連続して延びる外周溝６２が形成されている。シールド主部５８の外周縁部には軸方向片側に向かって突出する突出片６４が周方向に等角度間隔をおいて複数個（図示の実施形態においては３個）形成されている。シールド主部５８において突出片６４を含む角度領域６６の外径は局所的に低減せしめられており、突出片６４の外周面における軸方向中間部には径方向外方に突出する円弧状の嵌合凸部６８が設けられている。シールド主部５８の外周縁部における、突出片６４の径方向内側には局所的に肉厚が低減せしめられた凹所７０が形成されている。シールド主部５８の軸方向他側面には軸穴６０の外周縁を囲繞して軸方向に突出する円環形状の突出部７２も設けられている。シールド３５は、ハウジング本体３４の開口端において突出片６４がハウジング本体３４の没入部５４と整合せしめられた状態でハウジング本体３４の端板３６に向かって軸方向に押圧されることで、突出片６４の先端部がハウジング本体３４の外周壁３８の内側に進入し、嵌合凸部６８が嵌合凹部５６と嵌合することでハウジング本体３４と組み合される。嵌合凸部６８が外周壁３８の内側に進入する際には、突出片６４は凹所７０の存在に起因してこれを基端として径方向内側に容易に弾性変形可能である。 Explaining with reference to FIG. 6 together with FIGS. 1 and 2, the shield 35 is made of synthetic resin and includes a disk-shaped shield main portion 58. A shaft hole 60 is formed in the center of the shield main portion 58 through which the output shaft portion 28 of the output member 6 is inserted and rotatably supports the output shaft portion 28. An outer peripheral groove 62 extending continuously in the circumferential direction is formed on the outer peripheral edge portion of one side surface of the shield main portion 58 in the axial direction (the surface facing the internal space 48). A plurality (three in the illustrated embodiment) of projecting pieces 64 projecting toward one side in the axial direction are formed on the outer peripheral edge of the shield main portion 58 at equal angular intervals in the circumferential direction. In the shield main portion 58, the outer diameter of the angular region 66 including the projecting piece 64 is locally reduced, and an arcuate fitting extending radially outward to the axial intermediate portion on the outer peripheral surface of the projecting piece 64. The convex portion 68 is provided. In the outer peripheral edge portion of the shield main portion 58, a recess 70 whose wall thickness is locally reduced is formed inside the protruding piece 64 in the radial direction. An annular protrusion 72 that surrounds the outer peripheral edge of the shaft hole 60 and protrudes in the axial direction is also provided on the other side surface of the shield main portion 58 in the axial direction. The shield 35 is formed by axially pressing the projecting piece 64 toward the end plate 36 of the housing body 34 in a state where the projecting piece 64 is aligned with the immersion portion 54 of the housing body 34 at the open end of the housing body 34. The tip portion of 64 enters the inside of the outer peripheral wall 38 of the housing main body 34, and the fitting convex portion 68 fits with the fitting concave portion 56 to be combined with the housing main body 34. When the fitting convex portion 68 enters the inside of the outer peripheral wall 38, the protruding piece 64 can be easily elastically deformed inward in the radial direction with the recess 70 as a base end due to the presence of the recess 70.

図１及び図２を参照して説明すると、ハウジング３２（ハウジング本体３４）の内周面にはコイルばね７４が装着されている。コイルばね７４は金属製の線材を巻回して形成され、螺旋状に巻回されたコイル主部７６と、軸方向の両端において内方に曲げられたフック部７８ａ及び７８ｂとを備えている。自由状態におけるコイルばねの外径（つまりコイル主部７６の外径）はハウジング３２の内部空間４８の径よりも大きい。従って、コイルばね７４はハウジング本体３４の外周壁３８の内側に圧入される。若しくは、コイルばね７４は一時的に縮径された状態で外周壁３８の内側に進入した後に上記縮径が解除されてハウジング本体３４の外周壁３８の内側に装着される。従って、入力部材４が回転していないときは、コイル主部７６の外周面はハウジング本体３４の外周壁３８の内周面に密着している。フック部７８ａ及び７８ｂは夫々周方向の異なる位置に形成されており、これらは、図１のＣ－Ｃ断面に示すとおり、入力係止片８及び出力係止片２２が組み合わせて配置されることにより画成された２個の間隙３１の夫々に挿入されている。図示の実施形態においては、フック部７８ａ及び７８ｂはハウジング３２内において直径方向に対向して位置している。かようなコイルばね７４は、図示の実施形態においては、入力部材４及び出力部材６がハウジング３２の内部空間４８において所要とおりに組み合わされるとハウジング本体３４に形成された片側支持片５０及び入力部材４の入力係止片８に形成された他側支持片１０によって軸方向に支持される（図１のＢ－Ｂ断面を参照されたい）。 Explaining with reference to FIGS. 1 and 2, a coil spring 74 is mounted on the inner peripheral surface of the housing 32 (housing body 34). The coil spring 74 is formed by winding a metal wire rod, and includes a coil main portion 76 wound spirally and hook portions 78a and 78b bent inward at both ends in the axial direction. The outer diameter of the coil spring in the free state (that is, the outer diameter of the coil main portion 76) is larger than the diameter of the internal space 48 of the housing 32. Therefore, the coil spring 74 is press-fitted into the outer peripheral wall 38 of the housing body 34. Alternatively, the coil spring 74 is temporarily reduced in diameter and then enters the inside of the outer peripheral wall 38, and then the reduced diameter is released and the coil spring 74 is mounted inside the outer peripheral wall 38 of the housing body 34. Therefore, when the input member 4 is not rotating, the outer peripheral surface of the coil main portion 76 is in close contact with the inner peripheral surface of the outer peripheral wall 38 of the housing body 34. The hook portions 78a and 78b are formed at different positions in the circumferential direction, respectively, and these are arranged in combination with the input locking piece 8 and the output locking piece 22 as shown in the CC cross section of FIG. It is inserted into each of the two gaps 31 defined by. In the illustrated embodiment, the hook portions 78a and 78b are located in the housing 32 so as to face each other in the radial direction. In the illustrated embodiment, such a coil spring 74 is a one-sided support piece 50 and an input member formed in the housing body 34 when the input member 4 and the output member 6 are combined as required in the internal space 48 of the housing 32. It is axially supported by the other side support piece 10 formed on the input locking piece 8 of 4 (see the BB cross section of FIG. 1).

続いて、図７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作動について説明する。図７のＡ－Ａ断面及びＣ－Ｃ断面は共に図１のＡ－Ａ断面及びＣ－Ｃ断面と対応するものである。
図７（ａ）のＡ－Ａ断面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（同図の軸方向の右方から見て）に回転すると、同図のＣ－Ｃ断面に示すとおり、入力部材４に形成された入力係止片８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８は回転方向前方にあるフック部、即ちコイルばね７４の軸方向他側端部にあるフック部７８ａに当接し、フック部７８ａをばねの締め方向に押してハウジング３２（ハウジング本体３４の外周壁３８の内周面）に対するコイルばね７４の密着力を弱める。そして、かかる密着力に入力部材４の回転力が打ち勝つと、入力係止片８がフック部７８ａを押してコイルばね７４がハウジング３２に対して回転し、入力係止片８はフック部７８ａを介して出力係止片２２を押し、出力部材６は入力部材４及びコイルばね７４と一体となって回転する。このとき、図示の実施形態においては、出力支持軸２４の内側には入力部材４の嵌合軸１８が挿通せしめられていることで、両者間の所謂芯ぶれは防止される。また、コイルばね７４は入力部材４に形成された他側支持片１０及びハウジング３２に形成された片側支持片５０によって軸方向に支持されているため、縮径しても脱落することはない。さらにまた、入力係止片８の基端面及び出力係止片の延出端面の夫々（つまり夫々の軸方向片側端面）はその全体がハウジング３２の端板３６と当接するのではなく、夫々の径方向内側部分のみが端板３６に形成された支持突条４２と当接することから、接触面積が低減され摩擦抵抗は軽減される。入力部材が時計方向に回転した場合は、入力係止片８がコイルばね７４のフック部７８ｂに当接することを除いては反時計方向に回転した場合と同じであるため、詳細な説明は省略する。 Subsequently, the operation of the lock type bidirectional clutch configured according to the present invention will be described with reference to FIG. 7. Both the AA cross section and the CC cross section of FIG. 7 correspond to the AA cross section and the CC cross section of FIG.
As shown by the arrow in the AA cross section of FIG. 7A, the input member 4 is, for example, counterclockwise around the rotation axis o by the motor of the drive source (viewed from the right side in the axial direction of the figure). ), As shown in the CC cross section of the figure, the input locking piece 8 formed on the input member 4 also rotates around the rotation axis o in the same direction. The input locking piece 8 rotated around the rotation axis o abuts on the hook portion in front of the rotation direction, that is, the hook portion 78a at the other end in the axial direction of the coil spring 74, and the hook portion 78a is brought into contact with the hook portion 78a in the spring tightening direction. Push to weaken the adhesion of the coil spring 74 to the housing 32 (the inner peripheral surface of the outer peripheral wall 38 of the housing body 34). Then, when the rotational force of the input member 4 overcomes the close contact force, the input locking piece 8 pushes the hook portion 78a, the coil spring 74 rotates with respect to the housing 32, and the input locking piece 8 passes through the hook portion 78a. The output locking piece 22 is pushed, and the output member 6 rotates integrally with the input member 4 and the coil spring 74. At this time, in the illustrated embodiment, the fitting shaft 18 of the input member 4 is inserted inside the output support shaft 24, so that so-called misalignment between the two is prevented. Further, since the coil spring 74 is axially supported by the other side support piece 10 formed on the input member 4 and the one side support piece 50 formed on the housing 32, the coil spring 74 does not fall off even if the diameter is reduced. Furthermore, the base end surface of the input locking piece 8 and the extending end surface of the output locking piece (that is, each axial one-sided end surface) are not entirely in contact with the end plate 36 of the housing 32, but are in contact with each other. Since only the radial inner portion abuts on the support ridge 42 formed on the end plate 36, the contact area is reduced and the frictional resistance is reduced. The case where the input member is rotated clockwise is the same as the case where the input locking piece 8 is rotated counterclockwise except that the input locking piece 8 abuts on the hook portion 78b of the coil spring 74, and therefore detailed description is omitted. do.

一方、図７（ｂ）のＡ－Ａ断面の矢印に示すように、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の周りに時計方向（同図の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２２がコイルばね７４のフック部７８ａをばねの緩め方向に押して、ハウジング３２に対するコイルばね７４の密着力を強めるため、出力係止片２２はハウジング３２に対して回転しない。この点は、出力部材６を反時計方向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２２がフック部７８ｂと当接する）。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 shown by the arrow in the AA cross section of FIG. 7B, the rotation torque from the output member 6 side causes the output member 6 to rotate clockwise around the rotation axis o (to the right in the axial direction of the figure). The output locking piece 22 pushes the hook portion 78a of the coil spring 74 in the loosening direction of the spring, and the output locking piece 22 strengthens the adhesion of the coil spring 74 to the housing 32 even when the output locking piece 22 is rotated. Does not rotate with respect to the housing 32. This point is the same when the output member 6 is to be rotated counterclockwise (at this time, the output locking piece 22 comes into contact with the hook portion 78b). Therefore, the transmission of rotation from the output member 6 to the input member 4 is blocked because the output member 6 cannot rotate.

本発明のロックタイプ双方向クラッチによれば、入力支持軸１２及び出力支持軸２４の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させて入力係止片８及び出力係止片２２の基端部１４及び２６が構成されている、つまり入力係止片８及び出力係止片２２の基端部１４及び２６はその全体が入力支持軸１２及び出力支持軸２４と一体であってこれらに固定されていることに起因して、入力係止片８及び出力係止片２２における固定端からの軸方向長さは短縮される。これにより、入力係止片８及び出力係止片２２が夫々の先端側でコイルばね７４のフック部７８ａ又は７８ｂを押す際には、入力係止片８及び出力係止片２２が受ける回転モーメントはその腕の長さが短縮されたことに起因して減少し、入力係止片８及び出力係止片２２が倒れることは防止される。従って、装置全体にかかる回転トルクの許容値は大きくなる。 According to the lock type bidirectional clutch of the present invention, the required angle region of each outer peripheral surface of the input support shaft 12 and the output support shaft 24 is locally displaced outward in the radial direction to provide the input locking piece 8 and the output engagement. The base end portions 14 and 26 of the stop piece 22 are configured, that is, the base end portions 14 and 26 of the input locking piece 8 and the output locking piece 22 are entirely integrated with the input support shaft 12 and the output support shaft 24. However, due to the fact that they are fixed to them, the axial lengths of the input locking piece 8 and the output locking piece 22 from the fixed ends are shortened. As a result, when the input locking piece 8 and the output locking piece 22 push the hook portion 78a or 78b of the coil spring 74 on the tip side thereof, the rotational moment received by the input locking piece 8 and the output locking piece 22 is received. Is reduced due to the shortened length of the arm, and the input locking piece 8 and the output locking piece 22 are prevented from falling. Therefore, the permissible value of the rotational torque applied to the entire device becomes large.

本実施形態のロックタイプ双方向クラッチにあってはさらに、入力支持軸１２及び出力支持軸２４の軸方向端面は、軸方向に見てコイルばね７４の両端のフック部７８ａ及び７８ｂの中間で相互に当接していることから、入力係止片８及び出力係止片２２の各々が受ける回転モーメントの腕の長さをバランスよく低減させることができる。また、コイルばね７４の両端のフック部７８ａ及び７８ｂは入力係止片８及び出力係止片２２が組み合わせて配置される際に画成される２個の間隙３１に夫々挿入されていることに起因して、入力部材４及び出力部材６が回転する際には入力係止片８又は出力係止片２２がフック部７８ａ又は７８ｂに当接するまでの所謂遊びが存在し、かかる遊びの間は入力部材４及び出力部材６は相対回転する。入力部材４及び出力部材６が相対回転する際には、例えば入力係止片８の内周面及び出力支持軸２４の外周面のように相互に対向する面は摺動することとなるため、両面のいずれか一方又はその両方が摩耗する虞がある。しかしながら、本実施形態のロックタイプ双方向クラッチにあっては、入力部材４は出力部材６よりも軟質の合成樹脂材料により成形されていることから、入力部材４と出力部材６との相対回転によっては、出力部材６は摩耗せず入力部材４のみが摩耗する。そのため、入力部材４の方が出力部材６よりも交換頻度は高く、従って、本実施形態のロックタイプ双方向クラッチにあっては、交換すべき部品の在庫を管理しやすい。 Further, in the lock type bidirectional clutch of the present embodiment, the axial end faces of the input support shaft 12 and the output support shaft 24 are mutual between the hook portions 78a and 78b at both ends of the coil spring 74 when viewed in the axial direction. The length of the arm of the rotational moment received by each of the input locking piece 8 and the output locking piece 22 can be reduced in a well-balanced manner because they are in contact with each other. Further, the hook portions 78a and 78b at both ends of the coil spring 74 are inserted into the two gaps 31 defined when the input locking piece 8 and the output locking piece 22 are arranged in combination. Therefore, when the input member 4 and the output member 6 rotate, there is a so-called play until the input locking piece 8 or the output locking piece 22 abuts on the hook portion 78a or 78b, and during such play, there is a so-called play. The input member 4 and the output member 6 rotate relative to each other. When the input member 4 and the output member 6 rotate relative to each other, the surfaces facing each other, such as the inner peripheral surface of the input locking piece 8 and the outer peripheral surface of the output support shaft 24, slide. One or both of both sides may wear. However, in the lock type bidirectional clutch of the present embodiment, since the input member 4 is made of a synthetic resin material softer than the output member 6, the relative rotation between the input member 4 and the output member 6 causes the input member 4 to rotate. The output member 6 is not worn, and only the input member 4 is worn. Therefore, the input member 4 is replaced more frequently than the output member 6, and therefore, in the lock type bidirectional clutch of the present embodiment, it is easy to manage the inventory of parts to be replaced.

以上、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について添付した図面を参照して詳述したが、本発明は上述した実施形態に限定されるものではなく、本発明を逸脱しない範囲内において適宜の修正や変更が可能である。例えば、図示の実施形態においては、入力係止片及び出力係止片は共に断面円弧形状の単一の板状片であったが、これに替えて、共に周方向に間隔をおいて配置された一対の棒状片としてもよい。この場合、一対の棒状片である入力係止片の一方と一対の棒状片である出力係止片の一方とで、一対の棒状片である入力係止片の他方と一対の棒状片である出力係止片の他方とで夫々間隙を画成する。 Although the lock type bidirectional clutch configured according to the present invention has been described in detail with reference to the attached drawings, the present invention is not limited to the above-described embodiment and is appropriately used as long as it does not deviate from the present invention. Can be modified or changed. For example, in the illustrated embodiment, the input locking piece and the output locking piece are both single plate-shaped pieces having an arc-shaped cross section, but instead, they are both arranged at intervals in the circumferential direction. It may be a pair of rod-shaped pieces. In this case, one of the input locking pieces, which is a pair of rod-shaped pieces, and one of the output locking pieces, which is a pair of rod-shaped pieces, and the other of the input locking pieces, which are a pair of rod-shaped pieces, and a pair of rod-shaped pieces. A gap is defined with the other of the output locking pieces.

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：入力係止片
１２：入力支持軸
１４：（入力係止片の）基端部
２２：出力係止片
２４：出力支持軸
２６：（出力係止片の）基端部
３１：間隙
３２：ハウジング
７４：コイルばね
７８ａ及び７８ｂ：フック部 2: Lock type bidirectional clutch 4: Input member 6: Output member 8: Input locking piece 12: Input support shaft 14: Base end (of input locking piece) 22: Output locking piece 24: Output support shaft 26 : Base end (of output locking piece) 31: Gap 32: Housing 74: Coil springs 78a and 78b: Hook

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、
前記入力部材及び前記出力部材は軸方向に延びる入力係止片及び出力係止片を夫々備えており、前記入力係止片及び前記出力係止片は断面円形の内部空間を備えたハウジング内において周方向に２個の間隙が存在するよう組み合わせて配置されており、
前記ハウジングの内周面には線材を巻回して形成されたコイルばねが装着され、前記コイルばねの軸方向の両端には前記線材が内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ており、前記コイルばねの両端の前記フック部は前記２個の間隙の夫々に挿入され、
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前記フック部をばねの締め方向に押して、前記コイルばねと共に前記出力部材を回転させるが、前記出力部材を回転させようとしても、前記出力係止片が前記コイルばねの前記フック部をばねの緩め方向に押して、前記出力部材が回転不能となるロックタイプ双方向クラッチにおいて、
前記入力部材及び前記出力部材は前記共通の回転軸に沿って延びる断面円形の入力支持軸及び出力支持軸を夫々備え、前記入力支持軸及び前記出力支持軸の軸方向端面は、軸方向に見て前記コイルばねの両端の前記フック部の中間で相互に当接し、
前記入力係止片及び前記出力係止片は前記入力支持軸及び前記出力支持軸の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させた基端部を備えている、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 problem, an input member and an output member that can rotate around a common rotation axis are provided, and forward / reverse directions from the input member. The rotation of the output member is transmitted to the output member, and the rotation transmission from the output member to the input member is a lock type bidirectional clutch that shuts off the output member as non-rotatable.
The input member and the output member each include an input locking piece and an output locking piece extending in the axial direction, and the input locking piece and the output locking piece are in a housing having an internal space having a circular cross section. They are arranged in combination so that there are two gaps in the circumferential direction.
A coil spring formed by winding a wire rod is mounted on the inner peripheral surface of the housing, and hook portions in which the wire rod is bent inward are located at different positions in the circumferential direction at both ends of the coil spring in the axial direction. The hook portions at both ends of the coil spring are inserted into the two gaps, respectively.
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in the tightening direction of the spring to rotate the output member together with the coil spring, but attempts to rotate the output member. Also, in a lock type bidirectional clutch in which the output locking piece pushes the hook portion of the coil spring in the loosening direction of the spring and the output member becomes non-rotatable.
The input member and the output member each include an input support shaft and an output support shaft having a circular cross section extending along the common rotation axis, and the input support shaft and the axial end faces of the output support shaft are viewed in the axial direction. In the middle of the hooks at both ends of the coil spring, they come into contact with each other.
The input locking piece and the output locking piece include a proximal end portion in which the required angle regions of the outer peripheral surfaces of the input support shaft and the output support shaft are locally displaced outward in the radial direction. A lock type bidirectional clutch characterized by that is provided.

好ましくは、前記出力支持軸は円筒形状であって、前記出力支持軸の内側には、前記入力支持軸の軸方向端面に形成された前記共通の回転軸と同心の嵌合軸が相対回転可能に挿入されている。好適には、前記コイルばねの軸方向の両端に形成された前記フック部は、前記ハウジング内において直径方向に対向して位置する。前記ハウジングの内周面には径方向内側に突出する円環形状の片側支持片が、前記入力係止片の外周面には径方向外方に延びる円弧形状の他側支持片が夫々形成されており、前記コイルばねは前記片側支持片及び前記他側支持片によって軸方向に支持されているのが好適である。前記入力部材は比較的軟質の合成樹脂製で、前記出力部材は比較的硬質の合成樹脂製であるのが良い。前記入力係止片及び前記出力係止片の断面は共に円弧形状であるのが好ましい。 Preferably, the output support shaft has a cylindrical shape, and a fitting shaft concentric with the common rotation shaft formed on the axial end surface of the input support shaft rotates relative to the inside of the output support shaft. It is inserted as possible . Preferably, the hook portions formed at both ends of the coil spring in the axial direction are located in the housing so as to face each other in the radial direction. An annular-shaped one-sided support piece protruding inward in the radial direction is formed on the inner peripheral surface of the housing, and an arc-shaped other-side support piece extending outward in the radial direction is formed on the outer peripheral surface of the input locking piece. It is preferable that the coil spring is axially supported by the one-side support piece and the other-side support piece. It is preferable that the input member is made of a relatively soft synthetic resin and the output member is made of a relatively hard synthetic resin. It is preferable that the cross sections of the input locking piece and the output locking piece are both arcuate.

本発明のロックタイプ双方向クラッチによれば、入力支持軸１２及び出力支持軸２４の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させて入力係止片８及び出力係止片２２の基端部１４及び２６が構成されている、つまり入力係止片８及び出力係止片２２の基端部１４及び２６はその全体が入力支持軸１２及び出力支持軸２４と一体であってこれらに固定されていることに起因して、入力係止片８及び出力係止片２２における固定端からの軸方向長さは短縮される。これにより、入力係止片８及び出力係止片２２が夫々の先端側でコイルばね７４のフック部７８ａ又は７８ｂを押す際には、入力係止片８及び出力係止片２２が受ける回転モーメントはその腕の長さが短縮されたことに起因して減少し、入力係止片８及び出力係止片２２が倒れることは防止される。従って、装置全体にかかる回転トルクの許容値は大きくなる。本発明のロックタイプ双方向クラッチにあっては更に、入力支持軸１２及び出力支持軸２４の軸方向端面は、軸方向に見てコイルばね７４の両端のフック部７８ａ及び７８ｂの中間で相互に当接していることから、入力係止片８及び出力係止片２２の各々が受ける回転モーメントの腕の長さをバランスよく低減させることができる。 According to the lock type bidirectional clutch of the present invention, the required angle region of each outer peripheral surface of the input support shaft 12 and the output support shaft 24 is locally displaced outward in the radial direction to provide the input locking piece 8 and the output engagement. The base end portions 14 and 26 of the stop piece 22 are configured, that is, the base end portions 14 and 26 of the input locking piece 8 and the output locking piece 22 are entirely integrated with the input support shaft 12 and the output support shaft 24. However, due to the fact that they are fixed to them, the axial lengths of the input locking piece 8 and the output locking piece 22 from the fixed ends are shortened. As a result, when the input locking piece 8 and the output locking piece 22 push the hook portion 78a or 78b of the coil spring 74 on the tip side thereof, the rotational moment received by the input locking piece 8 and the output locking piece 22 is received. Is reduced due to the shortened length of the arm, and the input locking piece 8 and the output locking piece 22 are prevented from falling. Therefore, the permissible value of the rotational torque applied to the entire device becomes large. Further, in the lock type bidirectional clutch of the present invention, the axial end faces of the input support shaft 12 and the output support shaft 24 are mutually located between the hook portions 78a and 78b at both ends of the coil spring 74 when viewed in the axial direction. Since they are in contact with each other, the length of the arm of the rotational moment received by each of the input locking piece 8 and the output locking piece 22 can be reduced in a well-balanced manner.

本実施形態のロックタイプ双方向クラッチにあってはさらに、コイルばね７４の両端のフック部７８ａ及び７８ｂは入力係止片８及び出力係止片２２が組み合わせて配置される際に画成される２個の間隙３１に夫々挿入されていることに起因して、入力部材４及び出力部材６が回転する際には入力係止片８又は出力係止片２２がフック部７８ａ又は７８ｂに当接するまでの所謂遊びが存在し、かかる遊びの間は入力部材４及び出力部材６は相対回転する。入力部材４及び出力部材６が相対回転する際には、例えば入力係止片８の内周面及び出力支持軸２４の外周面のように相互に対向する面は摺動することとなるため、両面のいずれか一方又はその両方が摩耗する虞がある。しかしながら、本実施形態のロックタイプ双方向クラッチにあっては、入力部材４は出力部材６よりも軟質の合成樹脂材料により成形されていることから、入力部材４と出力部材６との相対回転によっては、出力部材６は摩耗せず入力部材４のみが摩耗する。そのため、入力部材４の方が出力部材６よりも交換頻度は高く、従って、本実施形態のロックタイプ双方向クラッチにあっては、交換すべき部品の在庫を管理しやすい。 In the lock type bidirectional clutch of the present embodiment, the hook portions 78a and 78b at both ends of the coil spring 74 are further defined when the input locking piece 8 and the output locking piece 22 are arranged in combination. When the input member 4 and the output member 6 rotate, the input locking piece 8 or the output locking piece 22 hits the hook portion 78a or 78b because they are inserted into the two gaps 31 respectively. There is a so-called play until they come into contact with each other, and the input member 4 and the output member 6 rotate relative to each other during the play. When the input member 4 and the output member 6 rotate relative to each other, the surfaces facing each other, such as the inner peripheral surface of the input locking piece 8 and the outer peripheral surface of the output support shaft 24, slide. There is a risk that one or both of both sides will wear. However, in the lock type bidirectional clutch of the present embodiment, since the input member 4 is made of a synthetic resin material softer than the output member 6, the relative rotation between the input member 4 and the output member 6 causes the input member 4 to rotate. Does not wear the output member 6, but only the input member 4. Therefore, the input member 4 is replaced more frequently than the output member 6, and therefore, in the lock type bidirectional clutch of the present embodiment, it is easy to manage the inventory of parts to be replaced.

Claims (7)

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、
前記入力部材及び前記出力部材は軸方向に延びる入力係止片及び出力係止片を夫々備えており、前記入力係止片及び前記出力係止片は断面円形の内部空間を備えたハウジング内において周方向に２個の間隙が存在するよう組み合わせて配置されており、
前記ハウジングの内周面には線材を巻回して形成されたコイルばねが装着され、前記コイルばねの軸方向の両端には前記線材が内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ており、前記コイルばねの両端の前記フック部は前記２個の間隙の夫々に挿入され、
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前記フック部をばねの締め方向に押して、前記コイルばねと共に前記出力部材を回転させるが、前記出力部材を回転させようとしても、前記出力係止片が前記コイルばねの前記フック部をばねの緩め方向に押して、前記出力部材が回転不能となるロックタイプ双方向クラッチにおいて、
前記入力部材及び前記出力部材は前記共通の回転軸に沿って延びる断面円形の入力支持軸及び出力支持軸を夫々備えており、
前記入力係止片及び前記出力係止片は前記入力支持軸及び前記出力支持軸の夫々の外周面の所要角度領域を局所的に径方向外方に偏倚させた基端部を備えている、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 that can rotate around a common rotation axis are provided, and forward / reverse rotation from the input member is transmitted to the output member, and rotation from the output member to the input member. Is a lock type bidirectional clutch that shuts off the output member as non-rotatable.
The input member and the output member each include an input locking piece and an output locking piece extending in the axial direction, and the input locking piece and the output locking piece are in a housing having an internal space having a circular cross section. They are arranged in combination so that there are two gaps in the circumferential direction.
A coil spring formed by winding a wire rod is mounted on the inner peripheral surface of the housing, and hook portions in which the wire rod is bent inward are located at different positions in the circumferential direction at both ends of the coil spring in the axial direction. The hook portions at both ends of the coil spring are inserted into the two gaps, respectively.
When the input member rotates, the input locking piece pushes the hook portion of the coil spring in the tightening direction of the spring to rotate the output member together with the coil spring, but attempts to rotate the output member. Also, in a lock type bidirectional clutch in which the output locking piece pushes the hook portion of the coil spring in the loosening direction of the spring and the output member becomes non-rotatable.
The input member and the output member each include an input support shaft and an output support shaft having a circular cross section extending along the common rotation axis.
The input locking piece and the output locking piece include a proximal end portion in which the required angular regions of the outer peripheral surfaces of the input support shaft and the output support shaft are locally displaced outward in the radial direction. A lock type bidirectional clutch that features that. 前記入力支持軸及び前記出力支持軸の軸方向端面は、軸方向に見て前記コイルばねの両端の前記フック部の中間で相互に当接する、請求項１に記載のロックタイプ双方向クラッチ。 The lock type bidirectional clutch according to claim 1, wherein the input support shaft and the axial end faces of the output support shaft are in contact with each other in the middle of the hook portions at both ends of the coil spring when viewed in the axial direction. 前記出力支持軸は円筒形状であって、前記出力支持軸の内側には、前記入力支持軸の軸方向端面に形成された前記共通の回転軸と同心の嵌合軸が相対回転可能に挿入されている、請求項１又は２に記載のロックタイプ双方向クラッチ。 The output support shaft has a cylindrical shape, and a fitting shaft concentric with the common rotation shaft formed on the axial end surface of the input support shaft is inserted into the inside of the output support shaft so as to be relatively rotatable. The lock type bidirectional clutch according to claim 1 or 2. 前記コイルばねの軸方向の両端に形成された前記フック部は、前記ハウジング内において直径方向に対向して位置する、請求項１乃至３のいずれかに記載のロックタイプ双方向クラッチ。 The lock type bidirectional clutch according to any one of claims 1 to 3, wherein the hook portions formed at both ends in the axial direction of the coil spring are located in the housing so as to face each other in the radial direction. 前記ハウジングの内周面には径方向内側に突出する円環形状の片側支持片が、前記入力係止片の外周面には径方向外方に延びる円弧形状の他側支持片が夫々形成されており、前記コイルばねは前記片側支持片及び前記他側支持片によって軸方向に支持されている、請求項１乃至４のいずれかに記載のロックタイプ双方向クラッチ。 An annular-shaped one-sided support piece protruding inward in the radial direction is formed on the inner peripheral surface of the housing, and an arc-shaped other-side support piece extending outward in the radial direction is formed on the outer peripheral surface of the input locking piece. The lock type bidirectional clutch according to any one of claims 1 to 4, wherein the coil spring is axially supported by the one-side support piece and the other-side support piece. 前記入力部材は比較的軟質の合成樹脂製で、前記出力部材は比較的硬質の合成樹脂製である、請求項１乃至５のいずれかに記載のロックタイプ双方向クラッチ。 The lock type bidirectional clutch according to any one of claims 1 to 5, wherein the input member is made of a relatively soft synthetic resin, and the output member is made of a relatively hard synthetic resin. 前記入力係止片及び前記出力係止片の断面は共に円弧形状である、請求項１乃至６のいずれかに記載のロックタイプ双方向クラッチ。 The lock type bidirectional clutch according to any one of claims 1 to 6, wherein both the input locking piece and the output locking piece have an arcuate cross section.

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