Patent ID: 9353837
Filing Date: 2016-05-31
CPC Classification: B60T,F16D,F16H,H02K,Y10T

Claim Text:
1. An electric linear motion actuator comprising: a rotary shaft to be driven by an electric motor; a plurality of planetary rollers kept in rolling contact with a cylindrical surface formed on an outer periphery of the rotary shaft; a carrier which retains the plurality of planetary rollers such that each of the plurality of planetary rollers is rotatable about a longitudinal axis down a center thereof while revolving around the rotary shaft, and of which an axial movement is restricted; an outer ring member surrounding the plurality of planetary rollers and supported so as to be slidable in an axial direction, wherein a helical rib is formed on an inner periphery of the outer ring member; and one of a helical groove and a circumferential groove is formed on an outer periphery of each of the plurality of planetary rollers so as to be engaged with the helical rib, and whereby a rotation of the rotary shaft is converted to a linear motion of the outer ring member; and a revolution sensor which detects one of a first rotation angle which constitutes a rotation angle of the carrier and a second rotation angle which constitutes a rotation angle of a member which revolves together with the carrier.