Abstract: A transmitting unit used for the transmission with a fixed transmission ratio. The external shape is similar to ordinary rolling bearings performs transmission with reduction of speed or increase of speed in a clockwise or counterclockwise direction, the input and output shafts being on the same axis. The transmitting unit comprises a dual eccentric sleeve, a transmitting race with equally divided radial grooves, with transmitting rods enclosing rolling members at both ends so that each covered length equals the radius of a rolling member, an internal gear race and rolling bearings. The transmission bearing can be installed in the main machine and no transmission cases are needed. It may also be installed as a generally used variable speed transmission mechanism, and can be used in industries requiring the use of various transmission mechanisms with fixed transmission ratios.