Direct-drive bicycle

A direct-drive bicycle, comprising:

• a bicycle body, which extends to include a front fork, wherein a tube is fixedly provided at the terminal end of the front fork;
• a front wheel is pivotally provided at the tube;
• a shaft passes through the tube and has two ends;
• a pedal is provided at each of the ends of the shaft through a connecting rod;
• the shaft is connected to a rotary disc;
• a friction disc is fixedly provided on a side of the front wheel;
• a transmission assembly comprising a spline shaft, a friction wheel, and a rotating wheel, wherein the spline shaft is rotatable, and is mounted at the front fork;
• the spline shaft has a plurality of grooves recessed into a surface thereof, wherein the grooves extend in the axial direction of the spline shaft;
• the friction wheel is slidably provided around the grooves, and presses against the friction disc;
• the rotating wheel is fixed on the spline shaft;
• the rotary disc is located between the front wheel and the spline shaft, and is configured to drive the rotating wheel to rotate;
• and
• a control device comprising a bifurcated pushing member, which is slidably provided at the front fork, wherein the bifurcated pushing member has two projecting portions respectively adjacent to two opposite sides of the friction wheel;
• the bifurcated pushing member is slidable in a direction in parallel to the axial direction of the spline shaft so as to move the friction wheel, whereby to change the position where the friction wheel presses against the friction disc;
• wherein the pedals are configured to sequentially drive the rotary disc, the rotating wheel, the spline shaft, the friction wheel, and the friction disc to directly drive the front wheel, and therefore provide continuously variable transmission effect.