Actuator
AssigneeSMC Corporation
InventorsShigekazu Nagai, Akio Saitoh, Toru Sugiyama
Life of this patent
Estimating the term…
Abstract
A motor, a ball screw shaft, etc. are accommodated within a frame that forms an outer frame. Direct-acting guides are provided on both sides of a groove-shaped opening defined in the frame. The ball screw shaft is centrally disposed within the frame. A table slides along the direct-acting guides under the action of rotation of the ball screw shaft. The ball screw shaft has ball-screw splines formed over its entire length and both ends thereof supported by the motor and a bearing. The center of rotation of the ball screw shaft is brought into alignment with the centers of rotation of the motor and the bearing by balls inserted into the ball-screw splines.
Claims7
An actuator comprising:
- a feed screw shaft operatively connected at one end thereof to a rotor of a motor for converting a rotational motion of said motor into a linear motion to displace a slider and wherein said feed screw shaft is connected at an opposite end thereof to a bearing permitting rotational motion of said feed screw shaft, said feed screw shaft having ball-screw splines formed over a length thereof, wherein said feed screw shaft is connected with said rotor and said bearing such that a center of rotation of said feed screw shaft is aligned with a center of rotation of said rotor and a center of rotation of said bearing by a plurality of balls disposed in said ball-screw splines between said feed screw shaft and said rotor, and between said feed screw shaft and said bearing, respectively.
Dependencies are inferred from the claim text.