Frictional transmission apparatus comprising simple planetary roller mechanism and brake mechanism, frictional transmission type rotational driving apparatus comprising the frictional transmission apparatus, series of the same, and method of fabricating frictional transmission apparatus

摘要

A frictional transmission apparatus (20) comprising a simple planetary roller mechanism (28) and a brake mechanism (22), the simple planetary roller mechanism (28) having friction rollers including a sun roller (30), a planetary roller (34), and a ring roller (36). Static friction torque Y obtainable from the brake mechanism (22) is set to fall within the range of 0.lXd Y 0.7Xd, where Xd is the value of test torque at which any of the friction rollers starts to make sliding rotations when the test torque is input in gradually increasing values to the sun roller (30) with a carrier (32) and the ring roller (36) fixed stationary. Besides, a squeezing force from the ring roller (36) is set so that Xd, critical test torque, falls within the range of 1.4-10.0 times static friction torque Y of the brake mechanism (22). The static friction torque Y and the critical test torque Xd are otherwise set to satisfy Y Xd, as well as dynamic friction torque Ys obtainable from the brake mechanism (122) at a rated revolution speed and limit transmission toque Xs of the simple planetary roller mechanism (128) with the sun roller (130) rotating at the rated revolution speed are set to satisfy 0.65Ys Xs 3.4Ys.