Motor for rotating jet sprinkler

Claim 1

A water motor for sprinklers, comprising: a. a body structure defining a cylindrical motor chamber; b. means defining ports communicating through a wall of said motor chamber in a direction tending to cause water entering said motor chamber to move in a circular path therein; c. means forming bearings at the axial extremities of said motor chamber; d. a tubular rotor journaled in said bearings and having a water outlet bore therein extending upwardly from its lower end and at least one radial inlet port through the tubular wall of the rotor at the upper end of said chamber, said rotor including a set of impact lobes defining a polygonal figure on the outer surface of the tubular wall thereof and within said chamber; e. and a drive ring having impact walls loosely surrounding said lobes; f. said drive ring having an axial dimension less than said motor chamber whereby the upper and lower axial ends of said drive ring defines, with the corresponding axial end wall of said motor chamber, radially inwardly directed relatively narrow annular flow passages, the upper flow passage communicating directly with said radial inlet port; and g. the water flowing in said passages being operable to suspend the drive ring between and free of the end walls of said motor chamber.