| 摘要 |
A nutating sprinkler assembly includes a sprinkler body having one end adapted to be coupled to a water supply conduit and an opposite end supporting a nozzle; at least one arm extending from the sprinkler body for supporting a removable cap assembly downstream of the nozzle, the cap assembly having a center body supporting a rotor plate having off-center grooves for distributing a stream exiting the nozzle and impinging upon the grooves. A spool bearing assembly having upper and lower bearing flanges is supported in the cap center body, and the center body mounts an interior ring loosely confining the spool bearing assembly and the rotor plate. The center body has an end wall formed with a post extending toward and received within a cavity of a lower spool bearing component of the spool bearing assembly when the rotor plate is in an at-rest position, thereby creating an unstable arrangement causing the rotor plate to tilt to an off-center position. The lower spool bearing component is comprised of a relatively heavy material for balancing the rotor plate and the spool bearing assembly about a center of nutation.
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