| 摘要 |
PURPOSE: A planetary gear reducer is provided to effectively reduce the external diameter of a planetary gear reducer by omitting the outer ring of a bearing. CONSTITUTION: A shell(10) comprises an annular toothed strip, a first annular smooth strip(111), and a second annular smooth strip(121). A planetary gear set(2) comprises a carrier(20) and a planetary gear(25) which is rotatably arranged inside the shell. A first semi-bearing(11) comprises a inner ring and a roller which are arranged in the circumference of one side section of the carrier. A second semi-bearing(12) comprises an inner ring and a roller which are arranged in the circumference of the other section of the carrier. A bearing(13) is arranged between a sun gear set(3) and the shell.
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