| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary roller type power transmission device improving durability of an internal ring, and capable of suppressing increase of transmission loss.SOLUTION: A planetary roller type power transmission device 1 includes: a sun roller 101 supported in a rotatable manner by a casing 13 with a main shaft as a center; a cylindrical internal ring 11 directly or indirectly connected to the casing; two or more planetary rollers 12 contacting with the outer peripheral surface of the sun roller and the inner peripheral surface of the internal ring; and a carrier 141 supported in a rotatable manner by the casing with a main shaft J1 as a center, and supporting the planetary roller in a rotatable manner. The planetary roller has such a barrel shape that an outer diameter of a center part is made large than an end part. The internal ring has an annular first projection part projecting radially outward, on its outer peripheral surface. The first projection part is arranged so that a contact region with the planetary roller on the inner peripheral surface of the internal ring, and a position in an axial direction are overlapped.SELECTED DRAWING: Figure 1 |
