PRELOAD FIXING APPARATUS OF ORBITAL FRICTION DRIVING MECHANISM

摘要

PURPOSE: A preload fixing apparatus of an orbital friction driving mechanism is provided to reduce noise and backlash by transmitting power from the input shaft to the output shaft without passing the gear train, to improve power transmission efficiency by restricting slip between the inner periphery of the ring roller and the outer periphery of the orbital roller with applying preload, and to prevent wear from friction by forming the lubrication film with injecting lubricant. CONSTITUTION: An orbital friction driving mechanism comprises a body casing(10) having a space part; an input shaft(20) inserted to the body casing; a sun roller(30) combined with the input shaft in the space part; a ring roller(40) mounted outside the sun roller in the space part; plural orbital rollers(50) rolled and contacted to the outer periphery of the sun roller and the inner periphery of the ring roller with revolving and rotating; and an output shaft(60) inserted to the body casing and extended in the same axis of the input shaft to rotate in revolving the orbital roller. The ring roller is divided into a right separation body having a fixing part fastened in the body casing and a roller part covering the right of the roller groove, and a left separation body having an assembling part and a roller part covering the left of the roller groove. A preload bolt combines the assembling part of the left separation body with the fixing part of the right separation body.