Patent ID: 7207918

Claim:
A mechanical continuously variable transmission capable of forward and reverse rotation comprising a power roller, which is rotated by a rotation axle connected on an input axle side, in contact with a plurality of counter rollers, which are connected on an output axle, and are driven to rotate by the rotation of the power roller, wherein a concave roll surface, which forms a circular arc if it were cut off along a plane going through the rotational center axis of the counter roller, is formed on the surface of each counter roller and the plurality of counter rollers are assembled rotatably neighboring each other on the same periphery of a disk connected to the output axle, whereby the circular arcs of the concave roll surfaces form a roughly continuous circle; a spherical roll surface is formed on the surface of the power roller so that a line which appears on the surface if the roll surface were cut off along a plane including a circle formed by said circular arcs of the counter rollers, becomes the same circular arc as the circular arc of said concave roll surfaces, whereby the power roller comes into line contact with each counter roller; and the rotation axle of the power roller is constructed and arranged so as to be continuously inclined with respect to the disk.