Friction roller-type transmission

A friction roller-type transmission comprising:

• an input shaft,
• a sun roller disposed concentrically with the input shaft and having a rolling contact surface on an outer peripheral surface thereof,
• an annular roller disposed concentrically with the sun roller at an outer periphery-side of the sun roller and having a rolling contact surface on an inner peripheral surface thereof,
• a plurality of intermediate rollers supported to be rotatable about an axis of rotation arranged in parallel with the input shaft in an annular space between the rolling contact surface of the sun roller and the rolling contact surface of the annular roller and configured to rolling-contact the outer peripheral surface of the sun roller and an inner peripheral surface of the annular roller, and
• an output shaft connected to an axial side surface of the annular roller or to the intermediate rollers,
• wherein the sun roller includes a pair of sun roller elements divided in an axial direction of the input shaft, and
• wherein at least one of the pair of sun roller elements is a moveable sun roller element configured to be freely moveable in the axial direction,
• the friction roller-type transmission further comprising a loading cam mechanism including a first cam surface formed along a circumferential direction of the input shaft and having an axial depth gradually changing in the circumferential direction, a second cam surface disposed to face the first cam surface, a rolling element held between the first and second cam surfaces, and an annular holding device configured to hold the rolling element in a pocket, the loading cam mechanism being configured to rotate any one of the first and second cam surfaces together with the input shaft and to axially displace the moveable sun roller element, and
• wherein the holding device comprises an inner diameter surface guiding part provided on an inner diameter surface and configured to be fitted over the input shaft and to thereby position the holding device relative to the input shaft.