Continuously variable speed transmission and steering differential

A continuously variable speed transmission and steering differential comprising:

• a. a laterally extending central drive axle rotatably driven by a power source;
• b. two pairs of drive sheaves namely a left and right pair, mounted to the drive axle;
• wherein each pair of drive sheaves includes a fixed drive sheave and a laterally moveable drive sheave along the drive axle;
• c. a means for transmitting rotational energy from the left drive sheaves to a left driven axle and from the right drive sheaves to a right driven axle;
• d. two spaced apart longitudinally extending shift arms connected to the moveable drive sheaves for controlling the positioning of the moveable drive sheaves;
• e. wherein narrowing or increasing the gap between the shift arms narrows or increases respectively the gap between each pair of drive sheaves and increases or decreases the gear ratio which increases or decreases the speed of the driven axles, thereby providing speed control;
• f. wherein shifting the shift arms either left or right varies the gear ratio between the left and right pair of sheaves which provides differential speed between the left and right driven axles thereby providing steering control;
• wherein said shift arms are connected to each other such that speed control and steering control is simultaneously and independently effected by controlling the position of the shift arms.