| 摘要 |
A dual drive ball screw (40) actuator has a ball screw shaft coupled at one end to a gear train (20) and coupled at the other end to a ball screw nut (60). The ball screw shaft (42) and ball screw nut are connected through complementary helical grooves filled with ball bearing balls (64). The outer surface of the ball screw nut is splined and can be driven by a second gear train. An output tube (70) is coupled at one end to the ball screw nut and at its opposite end has a connector portion (72) with a groove on its inner surface. A rod end (80) has a coupling member (82) for coupling to a surface to be actuated and a shaft portion (84) with a groove on its outer surface. This shaft portion is received with in the output tube portion and the corresponding grooves are coupled through the use of a plurality of ball bearing balls. The ball screw shaft (42) is journaled to a casing by a thrust bearing (100) having inner and outer races with complementary annular grooves that are coupled by ball bearings.
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