Stepless transmission gear system for automobiles

A stepless transmission gear system for automobiles comprising:

• a casing;
• an input shaft coupled to an external driving source and rotatably mounted in said casing at one end thereof;
• an output shaft rotatably mounted in said casing at the other end thereof substantially in axial alignment with said input shaft;
• a crankshaft rotatably and eccentrically supported by said input shaft so as to revolve around the axis of said input shaft as the latter is driven, said crankshaft having a crank pin disposed substantially between said input and output shafts in said casing and in axial alignment therewith when the transmission gear system is in the neutral position thereof;
• a shifter means operable from outside of said casing for turning said crankshaft around own axis thereof through an angle determined by the position of said shifter means to swing said crank pin therearound to a corresponding eccentric position off said axis;
• a stationary internal gear means secured to the inner wall of said casing coaxially with said input shaft;
• a variable-diameter pinion mechanism rotatably mounted on said crank pin and meshing with said internal gear means so as to make a planetary motion around said axis as said crank pin brought to said eccentric position revolves therearound, the diameter of said pinion mechanism being continuously variable with the eccentricity of said crank pin off said axis;
• and
• a coupling means for transmitting the rotation of said pinion mechanism to said output shaft when said pinion mechanism is making a planetary motion about said axis of said input shaft.