Patent ID: 9423010
Filing Date: 2016-08-23
CPC Classification: F16H,Y10T

Claim Text:
1. A method for manufacturing a rotational rectilinear motion conversion mechanism provided with an annular shaft in which an opening is formed, a sun shaft arranged in the opening of the annular shaft, and a planetary shaft arranged near the sun shaft in the opening of the annular shaft, in which the sun shaft includes a sun shaft main body, a first sun gear which is an external gear formed integrally with the sun shaft main body, and a second sun gear which is an external gear formed separately from the sun shaft main body, the planetary shaft includes a first planetary gear which is an external gear engaged with the first sun gear and a second planetary gear which is an external gear engaged with the second sun gear, and rotational motion of either one of the annular shaft and the sun shaft is converted into rectilinear motion of the other one of the annular shaft and the sun shaft along an axial direction by a planetary motion of the planetary shaft, the method comprising the steps of: holding the sun shaft main body and the second sun gear in a state in which relative rotation is disabled between the first and second sun gears when relative rotational phases substantially coincide between the first and second sun gears; and attaching the second sun gear to the sun shaft main body by relatively moving the sun shaft main body and the second sun gear in an axial direction after the step of holding the sun shaft main body and the second sun gear.