POWER TRANSMISSION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a power transmission device to perform power transmission through a rolling contact of a troidal type CVT (a transmission with continuously variable gear ratio) whereby the area in the neighbourhood of the contacting point can be cooled efficiently. SOLUTION: The power transmission device includes a roller 16 which makes rolling contact both with an input and an output discs for performing power transmission between the two discs. The surface 22 of the roller 16 confronting the two discs includes an abutting part 24 as an area actually contacting with the discs and an adjacent part 26 adjoining the abutting part 24 and not contacting with the discs. The adjacent part 26 is furnished with grooves 28 stretching from near the abutting part 24 in the direction going apart therefrom. Along the grooves the lubricating oil near the abutting part 24 is exhausted, which assures an increase in the circulating amount of the lubricating oil and allows efficient performance of cooling with the lubricating oil.