Importance

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Abstract

A motor (2) of a linear motion device (1) has a hollow motor shaft (21). A ball screw shaft (41) is inserted in a hollow section (25) of the hollow motor shaft (21), and a first male screw section (43), formed on the outer periphery of the ball screw shaft, is screwed into a female screw section (26), formed in the inner periphery of the hollow section, and fixed in position. A nut (46) is crewed on a second male screw section (45) formed on a shaft end section (44) of the ball screw shaft (41) that projects from the rear end of the hollow motor shaft, and the nut (46) is tightened at predetermined torque to a rear end face of the hollow motor shaft. Tensile force occurring between the first male screw section (43) and second male screw section (45) of the ball screw shaft (41) prevents loosening of the screwed section between the hollow motor shaft (21) and the ball screw shaft (41), and, as a result, the ball screw shaft (41) is kept firmly fixed to the hollow motor shaft (21) without having play. Removal of the ball screw shaft (41) from the hollow motor shaft (21) is also simple.

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First Claim