Continuously variable speed power transmission with and without integrated
motor/generator components. The transmission has an input member
rotatable about an input axis, an output member rotatable about an output
axis, a reaction control rotor with optional integrated motor/generator
components for selective rotation about the input axis, a pericyclic
motion converter mounted for pericyclic motion about the input axis, and
a control means for selectively adjusting the rate of rotation of the
reaction control rotor relative to the input member. A bevel gear
construction is a preferred embodiment of the transmission. A method for
varying speed ratios using pericyclic motion is described.