PURPOSE: To provide a planetary gear transmission that utilizes large attraction in using a steel ball being less in wear, dispensing with any maintenance such as lubrication or the like, and to improve the extent of transmission efficiency as well as to make a positive shift performable in addition to a low noise.
CONSTITUTION: A fixed solar disk 1, a driving solar disk 2 and a driven solar disk 3 consisting of a magnetic substance are accorded with one another of their center axes and set up in a parallel manner, and two steel balls 4a, 4b are annularly arranged among these solar disks 1, 2 and 3. In addition, these steel balls 4a, 4b at both sides of the driving solar disk 2 are held by ring plates 8a, 8b each and both these ring plates are connected by a separator 11. In succession, a ring groove 10, where these steel balls 4a, 4b enter, is installed in at least either of both these two disks 1, 2, and a permanent magnet ring 12 being magnetized in the radial direction is set up in a more inner diametral position than these annular steel balls 4a, 4b in the driving solar disk 2.
GOMI TAKAHIRO
MINAMIKAWA JIYUNICHI
KOBAYASHI AKIO
JISHAKU YUSO SYS KAIHATSU KK
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