Patent ID: 8187134

Claim:
A friction roller type power transmission device configured to allow power transmission between a pair of friction rollers by pressing the friction rollers against one another in a radial direction of the friction rollers into frictional contact with one another in one of a direct manner and an indirect manner, wherein: one of the friction rollers is supported for rotation about an eccentric axis with respect to a crankshaft whose rotational position is adapted to be controlled to adjust a radial pressing force between the friction rollers; each side of the friction rollers in an axial direction of the friction rollers is provided with a bearing support to which the crankshaft related to the one of the friction rollers, and a friction roller shaft related to another of the friction rollers are bearing-fitted, so that the bearing supports bear a radial pressing force reaction between the friction rollers; and each bearing support is formed with a constricted portion at a center section of the bearing support between bearing-fitting portions at end sections of the bearing support, for lowering support stiffness of the bearing support against the radial pressing reaction between the friction rollers.