LIFTING DRIVE UNIT FOR ELEVATOR

摘要

PROBLEM TO BE SOLVED: To eliminate the noise by meshing of gears by arranging a speed reducer using friction gearing instead of a mechanical reduction gear. SOLUTION: The rotation of an electric motor 2 is transmitted from an electric motor shaft 25 to a pinion shaft 53 through a coupling 15 to rotate a pinion roller 55. The rotation of the pinion roller 55 is transmitted to a first reduction roller 57 having a larger diameter to make frictional contact with the roller 55, and an intermediate shaft 61 transmits the rotation of the electric motor shaft 25 reduced in speed in inverse proportion to the diameters of both the rollers 55 and 57 to a second reduction roller 59 having a diameter smaller than the first reduction roller 57. The second reduction roller 59 further transmits the rotation to a third reduction roller 63 having a larger diameter to make friction contact with it. A drive wheel 13 fixed to a drive shaft 35 is rotated by the rotation further reduced in speed to a ratio inverse proportional to the diameters of the both. A lubricating oil is applied among the rollers 55, 57 and 63 in order to prevent the wear by contact. The lubricating oil contributes also to the reduction in noise in lifting drive.