| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling screw device capable of enlarging load capacity compared to a case of using a spherical type rolling element as a rolling element, and reducing friction torque compared to a case of using a roller type rolling element as the rolling element. SOLUTION: Between a number of roller type rolling elements 15 rolling between spiral raceway grooves 13 and 14 formed to face each other in an outer circumferential surface of a screw shaft 11 and an inner circumferential surface of a nut 12, spherical type rolling elements 71 of a larger diameter than outer diameter of the roller type rolling elements 15 are disposed. Since the roller type rolling elements 15 get in linear-contact with groove surfaces of the spiral raceway grooves 13 and 14, large load capacity can be obtained. Since the spherical type rolling elements 17 get in point-contact with groove surfaces of the spiral type raceway grooves 13 and 14, friction torque is reduced. COPYRIGHT: (C)2004,JPO
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