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US 6,476,525 B2Granted
Linear actuator
AssigneeSMC Corporation
InventorsToshio Sato, Shogo Miyazaki, Yoshiteru Ueno
Life of this patent
Estimating the term…
Abstract
A linear actuator comprises a mobile which is provided substantially perpendicularly to a longitudinal axis of a ball screw shaft with its first side portion connected to a screw guide member and with its second side portion slidably fitted to a slider, while movably holding a ball screw nut engaged with the ball screw shaft by the aid of the screw guide member which is finely movable in a recess of the slider allowed to ride over a guide rail in a bridging manner.
Claims7
A linear actuator comprising:
- a guide rail provided with ball-rolling grooves extending in a major axis direction on both side surfaces and formed with a concave groove having a substantially U-shaped cross section;
- a ball screw shaft arranged substantially in parallel to said ball-rolling grooves at a central portion in a widthwise direction substantially perpendicular to said major axis direction of said guide rail;
- bearings for supporting said ball screw shaft at both ends in said major axis direction of said guide rail;
- a slider formed with endless circulating passages including ball-rolling grooves opposed to said ball-rolling grooves of said guide rail so that said guide rail faces an interior of a recess;
- a ball screw nut installed to a recess of said slider, for making engagement with said ball screw shaft;
- and
- a screw guide member for movably supporting said ball screw nut, said linear actuator further comprising:
- a floating mechanism for absorbing fine movement of said ball screw nut in a direction substantially perpendicular to a displacement direction on a substantially horizontal plane, and fine movement of said ball screw nut in a substantially vertical direction respectively.
5 more elements
Dependencies are inferred from the claim text.