Abstract: A mechanical clutch free transmission in which a power input shaft concurrently rotates a rigid sphere and a first gear of a differential, which differential has a second gear. A circumferentially extending sequence of rollers are supported in frictional contact with the sphere by a power transmitting ring that rotates within a tilt ring that may be selectively pivoted about an axis that is normal to the axis of rotation of the sphere. The power transmitting ring has a ring gear secured thereto that by a gear train rotates the second gear of the differential. The first and second gears of the differential engage a pair of idling gears supported on a cross piece connected to the power output shaft of the transmission. When the tilt ring is normal to the axis of rotation of the sphere the sequence of rollers rotate at the same rate as the sphere and the power output shaft rotates at a maximum rate in a positive direction relative to the rate of rotation of the power input.

Abstract: A mechanical transmission with a variable speed ratio that generates two oscillatory rotary motions that may have the velocities thereof selectively increased or decreased by concurrently increasing or decreasing the effective lengths of a pair of crank arms, with one of the oscillating rotary motions being rectified by two over riding clutches to become a pulsating rotary motion in a constant direction, and the pulsating and oscillating rotary motions thereafter being combined by a differential to result in a fixed ratio of output to input velocity for each setting of the pair of crank arms.