| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planetary gear type reduction gear with low vibration and noise capable of providing a wide range of rotations in combination with a servo motor and applicable to the main spindle drive devices of various types of devices and machines. <P>SOLUTION: In this planetary roller type reduction gear using a plurality of planetary roller mechanisms, an external spline is fitted to the rear end part of a first transmission shaft formed by extending rearward the shaft of the carrier of the planetary roller mechanism on the forefront stage forming a next stage input shaft, an external spline is fitted to the rear end part of a cylindrical second transmission shaft formed by externally fitting the shaft of the carrier of the next stage planetary roller mechanism onto the intermediate part of the first transmission shaft, and two internal splines selectively meshed with the external spline of the first transmission shaft and the external spline of the second transmission shaft are fitted to the front part. Also, the reduction gear comprises a selection shaft spline-coupled, at its rear part, with a final output shaft and slidable in the axial direction and a selection shaft drive means axially reciprocating the selection shaft. The selection shaft is moved in the axial direction and the two internal splines of the selection shaft are engaged with either of the external splines of the first and second transmission shafts. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
