초록 ▼

A linear to rotary ball screw actuator which includes both helical grooves and straight grooves longitudinally spaced apart on the outer surface of the shaft. Matching helical grooves and straight grooves are formed on opposed inner surfaces of first and second portions of relatively moveable housin

A linear to rotary ball screw actuator which includes both helical grooves and straight grooves longitudinally spaced apart on the outer surface of the shaft. Matching helical grooves and straight grooves are formed on opposed inner surfaces of first and second portions of relatively moveable housing to provide passageways filled with balls. A return passageway is provided through the housing by way of a straight bore parallel to the longitudinal axis of the shaft. Also disclosed is a ball screw rotary actuator of the type above described but having an additional section including either straight or helical grooves thereby to define an actuator having either a central helically grooved portion sandwiched between straight grooved portions or alternatively a central straight grooved portion with helical grooved portions on either side thereof.

대표청구항 ▼

A ball screw rotary actuator for converting a linear input motion to a rotary output motion and have recirculating balls therein comprising: (A) A hollow housing having first and second sections, said first section being angularly relatively movable with respect to said second section: (B) A shaft m

A ball screw rotary actuator for converting a linear input motion to a rotary output motion and have recirculating balls therein comprising: (A) A hollow housing having first and second sections, said first section being angularly relatively movable with respect to said second section: (B) A shaft mounted for reciprocal movement within said housing, said shaft including: (1) Helical groove means formed in the surface of a first portion thereof and; (2) Straight groove means formed in the surface of a second portion thereof displaced longitudinally from said first portion, said straight groove means disposed parallel to the axis of said shaft; (C) The interior faces of said first and second sections of said housing having groove means matching the groove means in said shaft portion disposed opposed thereto; (D) Ball screw means defined by said housing; (E) A plurality of balls disposed in and filling said matching groove means and said ball return means and; (F) Means for imparting reciprocal linear movement to said shaft.