| 摘要 |
<p>A mechanical actuator having a housing in which a gear-nut assembly is rotatably mounted on bearings to be driven by a drive shaft extending into the housing through a sealed aperture. The gear-nut assembly includes a gear component engaging the drive shaft, a ball nut component carrying a plurality of ball members arranged in driving engagement with a screw member extending through the interior of the gear-nut assembly, and a tubular shield member mounted in covering relation about the ball nut component and sealed at the ends thereof to cover ball return tubes on the surface of the ball nut component. Annular seals are provided at each end of the gear-nut assembly to extend in sealing relation between the exterior surface thereof and the housing to thereby form a sealed cavity about the drive for the gear-nut member assembly and, preferably, the bearings thereof, and this sealed cavity is filled with lubricating oil which serves to lubricate the moving parts therein and to assist in dissipating heat generated by such moving parts.</p> |
