AUTOMATICALLY GEAR-SHIFTING BICYCLE

摘要

PURPOSE: An automatically gear-shifting bicycle is provided to make a user conveniently accelerate or travel on an uphill road by changing the motion of a brake into energy and to automatically shift the gear of a bicycle by using a hydraulic pedal. CONSTITUTION: A spring is embedded in a rear portion of a piston, and a pedal cylinder(62) charged with oil is installed in a front portion of the piston. A rod(75) is hinge-coupled to the end portion of a rod(64) of the pedal cylinder. An oil chamber of a control cylinder(72) is formed behind the piston. An air chamber is formed in front of the piston. The oil chamber is compressed by the reciprocation of the rod. Hydraulic motors(36,46) rotate by the compression of the oil chamber. Shaft sprockets(32,42) prepared in wheel shafts(30,40) rotate wheels(12,14) by being connected with motor sprockets(38,48) via chains(34,44). An oil tank(102) supplies oil to the hydraulic motors and the control cylinder. A shift holding switch controls the amount of the oil supplied to the pedal cylinder.