| 主权项 |
1. A method for manufacturing a rotational rectilinear motion conversion mechanism provided with an annular shaft through which an opening extends in an axial direction, a sun shaft arranged in the annular shaft, and a plurality of planetary shafts arranged around the sun shaft, in which the annular shaft includes an annular shaft main body having an annular threaded section defined by an internally threaded section, the sun shaft includes a sun shaft main body having a sun threaded section defined by an externally threaded section, the planetary shafts each include a planetary shaft main body having a planetary threaded section defined by an externally threaded section, the planetary threaded section is engaged with the annular threaded section and the sun threaded section, 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:
forming an indicator in each of the planetary shaft main bodies; forming the planetary threaded section in each of the planetary shaft main bodies based on a planetary indicator, which is the indicator of the planetary shaft main body; corresponding a relationship of the planetary shaft main bodies relative to the sun shaft main body in arrangement to a relationship in a regular assembled state of the planetary shaft main bodies relative to the sun shaft main body, with the regular assembled state being defined by a state in which the sun threaded section and the planetary threaded sections are engaged with each other in a state in which the planetary shaft main bodies are arranged at even intervals around the sun shaft main body; and assembling a basic assembly by moving each of the planetary shaft main bodies after corresponding the relationship of the planetary shaft main bodies relative to the sun shaft main body to the relationship in the regular assembled state, the basic assembly being an assembly formed by a combination of the sun shaft main body and the planetary shaft main bodies in the regular assembled state; wherein the step of assembling a basic assembly includes the step of setting a planetary shaft relative phase, which is a rotational phase of each of the planetary shaft main bodies relative to a rotational phase of the sun shaft main body, as a planetary shaft regular phase, which is the planetary shaft relative phase in the regular assembled state, based on the rotational phase of the sun shaft main body and the rotational phase of the planetary indicator, by fastening each of the planetary shaft main bodies to a threaded jig, in which an internally threaded section for engaging the planetary threaded sections is formed, before combining the planetary shaft main bodies with the sun shaft main body. |
