Untersetzungsgetriebe-Mechanismus und elektrische Servolenkung

摘要

A reduction gear mechanism includes mutually meshing smaller gear (2) and larger gear (4) with their shafts (1, 3) arranged parallel to each other; a first rotor (7) which rotates together with the smaller gear (2); and a second rotor (8) which rotates together with the larger gear (4), so as to generate sliding friction between the first rotor (7) and itself in the reverse rotation direction of one of the smaller gear (2) and larger gear (4). When a relative speed is generated between the smaller gear (2) and larger gear (4) by reverse rotation of one of the smaller gear (2) and larger gear (4), resistance is applied to the reverse rotation of one of the gears and the relative speed is decreased to reduce rattling noise which is made when the surfaces of their teeth come into contact with each other.