ELECTRIC DIRECT-ACTING ACTUATOR AND ELECTRIC BRAKE DEVICE

摘要

PROBLEM TO BE SOLVED: To relax a contact pressure of an edge portion of a circumferential groove or a helical groove on a planet roller rolling-contacting an outer diameter surface of a rotating shaft and an inner diameter surface of an outer ring member.

SOLUTION: The edge portion of the helical groove 7a on the planet roller 7 is subjected to chamfering 7b, which relaxes the contact pressure of the edge portion of the helical groove 7a rolling-contacting the outer diameter surface of the rotating shaft and the inner diameter surface of the outer ring member 5.

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