Pedaling sensing device of electric bicycle

A pedaling sensing device of an electric bicycle, which is configured to connect to a motor of the electric bicycle, comprising:

• a crank axle extending along an axial direction and comprising an outer surface, wherein the crank axle is formed with a plurality of first helical teeth disposed around the outer surface, the plurality of first helical teeth are connected to each other and arranged continuously;
• a first gearwheel disposed around the crank axle and comprising a first inner annulus surface and a first outer annulus surface opposite to the first inner annulus surface, wherein the first inner annulus surface is formed with a plurality of second helical teeth matching the plurality of first helical teeth, the plurality of second helical teeth are connected to each other and arranged continuously, the first outer annulus surface is formed with a first transmission structure;
• a second gearwheel disposed around the first gearwheel and having a second inner annulus surface, wherein the second inner annulus surface is formed with a second transmission structure matching the first transmission structure;
• an assisting unit disposed around the crank axle and connected with the motor;
• and
• a sensing unit disposed around the crank axle and located adjacent to the first gearwheel, wherein the sensing unit is signally connected with the motor,
• wherein when a force is applied to rotate the crank axle, the crank axle drives the first gearwheel and the second gearwheel to rotate through the plurality of first helical teeth and the plurality of second helical teeth, and the first gearwheel also moves relative to the crank axle along the axial direction, the sensing unit senses the movement of the first gearwheel along the axial direction and outputs a sensing signal so that the motor drives the electric bicycle forward through the assisting unit according to the sensing signal,
• wherein each of the plurality of first helical teeth has a first surface and a second surface which are connected to each other, each of the plurality of second helical teeth has a third surface and a fourth surface which are connected to each other, the first surface, the second surface, the third surface and the fourth surface are inclined planes,
• wherein the second gearwheel includes a first one-way mechanism, the assisting unit includes a connecting base having a second one-way mechanism that cooperates with the first one-way mechanism, when the crank axle is rotated by the force, the crank axle drives the connecting base to rotate only in a first direction through the first one-way mechanism and the second one-way mechanism, the first direction is a direction in which the crank axle is rotated by the force.