Abstract: On the reciprocating bane of a reciprocating vane type rotary internal combustion engine (vane engine), big centrifugal force is generated by a high-speed rotation and is opposed to combustion pressure, and force equal to or more than seal action force to be necessary for vanes tip is added to the case inside, and friction loss becomes big.

Abstract: A gear transmission and a spherical surface frictional transmission are performed simultaneously in a power-transmission of a continuously variable speed transmission so as to utilize the high efficiency of the gear transmission and the continuously variable capability of the frictional transmission to the maximum. The continuous speed variation is made by a combination of a planetary gear speed reducer with a ratio (contact point radius ratio) dynamic frictional transmission device, a combination of the planetary gear speed reducer, a ratio dynamic frictional transmission device and a differential gear device, and a combination of a ratio dynamic frictional transmission device with a differential gear device. The transmission is suitable for use in those device requiring continuous speed variation such as cars, air conditioners, blowers and exhausters, pumps, industrial machinery and so on.