at least one supporting planetary roller application_number US 29876202 A description referring now to fig1 and 2 one embodiment of the cylindrical planetary traction drive a comprises an outer ring member 1 a sun roller member 2 a first planetary roller 5 two second planetary rollers 3 amp 4 and a carrier member 27 the outer ring member 1 further comprises a first cylindrical raceway 9 surrounding the axis of rotation and a first fixed flange 10 and a second fixed flange 11 the sun member 2 includes a second cylindrical raceway 12 a third fixed flange 13 a fourth fixed flange 14 and a shaft 15 the first planetary roller 5 has a third cylindrical raceway 16 and the second planetary rollers 3 and 4 have a fourth cylindrical raceway 18 and 17 respectively the first planetary roller 5 and the two second planetary rollers 3 and 4 are placed between and in contact with first cylindrical raceway 9 and second cylindrical raceway 12 at least one of either the planetary roller 5 or the planetary rollers 3 and 4 is flexible compared to other rollers in the embodiment shown herein the first planetary roller 5 is the flexible roller and serves as a loading roller thus it will hereafter be called the loading planetary roller 5 the loading planetary roller 5 deforms noticeably when diametrically squeezed at least one of the second planetary rollers 3 and 4 is a supporting roller the supporting roller is relatively rigid and hardly deforms under diametrical load in the embodiment shown herein both planetary rollers 3 and 4 are supporting rollers and.