LINEAR ACTUATOR

• Main Authors: KANEKO AKITO, HOSAKA EIJI, HAGIWARA KEISUKE, KURIBAYASHI HIROOMI
• Format: Patent
• Language: English; Japanese
• Published: 26.05.2016
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a linear actuator capable of continuing to keep a shaft member in a constant position with respect to external force without installation of a brake mechanism independently from a feeding mechanism, arbitrarily moving the shaft member by a simple operation even when a motor cannot be used, and achieving reduction in weight and size.SOLUTION: A linear actuator includes: a worm 3 to which rotation is given by a motor 2; a shaft member 4 in which rack teeth 40 engaged with the worm 3 are arrayed along the longitudinal direction and a rolling element rolling surface 41a is formed along the longitudinal direction; a guide member 42 which is assembled to the shaft member 4 via a large number of rolling elements rolling on the rolling surface 41a of the shaft member 4; and a support member which rotatably holds the worm 3 and to which the guide member 42 is fixed.SELECTED DRAWING: Figure 1 【課題】送り機構と別途にブレーキ機構を設けることなく、外力に対して軸部材を一定位置に保持し続けることができると共に、モータが使用できない場合であっても簡便な操作で軸部材を任意に移動させることができ、軽量化、小型化を達成することが可能なリニアアクチュエータを提供する。【解決手段】モータ２によって回転が与えられるウォーム３と、前記ウォーム３と噛み合うラック歯４０が長手方向に沿って配列されると共に長手方向に沿って転動体の転走面４１ａが形成された軸部材４と、前記軸部材４の転走面４１ａを転走する多数の転動体を介して当該軸部材４に組みつけられた案内部材４２と、前記ウォーム３を回転自在に保持すると共に前記案内部材４２が固定される支持部材と、を備えている。【選択図】 図１