Patent ID: 8672792
Filing Date: 2014-03-18
Classification: F16C,F16H

Abstract:
1. A speed increasing/decreasing apparatus comprising: a first rotary shaft that is disposed in such a manner as to be rotatable around a rotation axis; a second rotary shaft that is disposed in such a manner as to be rotatable around the rotation axis and that has a cylindrical supporting part covering an end section of the first rotary shaft; a case that supports the first rotary shaft and the second rotary shaft; a first rolling bearing that is disposed between the first rotary shaft and the case and that supports the first rotary shaft in such a manner as to be rotatable; a second rolling bearing that is disposed between the supporting part and the first rotary shaft and that supports the first rotary shaft and the second rotary shaft in such a manner as to be rotatable relative to each other; a preload unit that is provided on the case and that applies a preload force such that the second rotary shaft is pushed to the first rotary shaft side; a transmission part of the second rotary shaft that transmits the preload force applied to the second rotary shaft to the second rolling bearing; and a load-receiving part of the case that receives the preload force transmitted from the second rolling bearing to the first rolling bearing, wherein the first rolling bearing includes the second rolling bearing includes wherein a rotational speed ratio i of rotational speed n