| 摘要 |
<p>The gear drive sprinkler includes a fixed ring gear (44) fixed to the sprinkler housing (2) and having a circular array of teeth; a rotatable ring gear (46) coupled to the sprinkler nozzle (8) and having a circular array of teeth coaxial with, but of a different number than, the teeth of the fixed ring gear (44); and a planetary gear (42) rotated by the sprinkler drive (30) and having a circular array of teeth meshing with the teeth of both ring gears (44, 46) so as to planetate around both ring gears (44, 46) and thereby to rotate the rotatable ring gear (46) at an angular velocity corresponding to the difference in the number of teeth in the two ring gears (44, 46). <IMAGE></p> |
