ELECTRIC ACTUATOR

• Main Authors: SATO KOJI, HIRANO SHINSUKE, SAITO TAKAHIDE, KAWAI MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 26.03.2020
• Subjects: BLASTING; BRAKES; CLUTCHES; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUPLINGS FOR TRANSMITTING ROTATION; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To provide an electric actuator capable of surely regulating linear motion even when external force is applied to a screw shaft in a stop state of a driving unit.SOLUTION: A lock mechanism unit includes: a cylindrical surface C formed on a fixed shaft 75; a cam surface 415 formed on an inner diameter surface of a drive gear 41 and forming a wedge-shaped space G between the cylindrical surface and the cam surface itself; a roller 73 movably arranged between the cylindrical surface C and the inner diameter surface of the drive gear 41; a compression coil spring 74 for normally energizing the roller 73 to a regulation position for regulating rotation of the drive gear 41 by restricting the roller 73 by the cylindrical surface C and the cam surface 415; and a cylindrical input retainer to be rotated integrally with an output member of the drive unit. The input retainer includes: a pressurizing section 71e capable of applying pressurizing force for separating the roller 73 from the regulation position to the roller 73 against the energization force of the compressed coil spring 74 in accordance with rotational drive of the driving unit: and an engagement section 71d to be engaged with the driving gear 41 in a peripheral direction of the drive gear 41.SELECTED DRAWING: Figure 7 【課題】駆動部の停止状態でねじ軸に外力が作用した場合でも直線運動するのを確実に規制する電動アクチュエータを提供する。【解決手段】ロック機構部は、固定軸７５に設けられた円筒面Ｃと、駆動ギヤ４１の内径面に設けられ、円筒面Ｃとの間に楔状空間Ｇを形成するカム面４１５と、円筒面Ｃと駆動ギヤ４１の内径面との間に移動可能に配置されたローラ７３と、ローラ７３を円筒面Ｃとカム面４１５とで拘束することにより駆動ギヤ４１の回転を規制する規制位置に向けてローラ７３を常時付勢した圧縮コイルばね７４と、駆動部の出力部材と一体回転する筒状の入力保持器と、を備える。入力保持器は、駆動部が回転駆動されるのに伴って、圧縮コイルばね７４の付勢力に抗してローラ７３を規制位置から離脱させるための加圧力をローラ７３に付与可能な加圧部７１ｅ、および駆動ギヤ４１の周方向で駆動ギヤ４１と係合する係合部７１ｄを有する。【選択図】図７