It is well known that among motorcycles, the curved beam motorcycle is the most fuel-efficient and has a simple structure. Although the pedal motorcycle is easy to operate and has a stepless speed change transmission method, it has the highest fuel consumption among cross-riding, curved beam and pedal motorcycles of the same displacement. What is the reason for this? Let's find out.

In terms of mechanical transmission, the ultimate drive of a vehicle starts from the engine. The engine generates power, which is transmitted to the clutch through the crankshaft. The clutch engages or disengages according to the driver's operation, transmitting power to the continuously variable transmission. The continuously variable transmission achieves continuous speed changes through conical wheels and belts or chains. Finally, the chain or belt transmits power to the rear wheels, driving the motorcycle forward.

Stepless variable speed belt drive

In this way, power is transmitted among the engine, the continuously variable transmission and the rear wheels.

During the transmission process, the continuously variable transmission is the part with the most power loss, so the transmission system of the scooter is also relatively fuel-consuming.

Transmission loss mainly comes from several aspects.

The first is the elastic sliding of the belt. When the belt is in operation, the tension on the tight side and the loose side is different, causing elastic deformation of the belt. Relative sliding occurs between the driving pulley and the driven pulley. This sliding is not a completely effective power transmission, resulting in energy loss. For instance, just like pulling an object with an elastic rope, the rope will stretch and retract, and this process will consume some of the energy used to pull the object.

Features

① Belt drive is prone to slipping and the transmission ratio is inaccurate

② Poor heat resistance, poor overload capacity, and prone to aging

③ The transmission damping is large, especially when the vehicle is cold (fuel consumption generally increases in northern winters)

④ Cause excessive lateral force on the bearing

"Pu Li Zhu"

The second is the friction among various transmission components. Such as the friction between belts and pulleys, the friction of bearings in transmission systems, etc. These frictions will convert some mechanical energy into heat energy, which is dissipated into the air, resulting in the power not being fully transmitted from the engine to the wheels. In the transmission system, the bowler and the swing block are the major heat sources and also the places with the greatest power loss.

The scooter starts to slip from the very beginning. As the speed increases, the swing block will bond more firmly with the bowl. When pedaling, with frequent stops and starts, sudden acceleration, or running at full throttle, the belt and the slippage are the most frequent. This situation can also easily cause the bowl to overheat, turn blue, and anneal.

The bowl and the slippage block are burning blue

From the principle of pedal transmission, it can be seen that scooters can handle intense and stop-and-go driving. However, in this driving mode, whether it is the sliding friction of the front master and slave disc belts or the friction between the rear swing block and the bowl, they will all change sharply and cause slippage.

To reduce power loss on a scooter, it is necessary to have a good driving habit, travel at a constant speed as much as possible, and minimize the power loss caused by the slippage of the belt and the swing block. ❎ Incorrect driving habits not only cause fuel consumption to be much higher than usual, but also lead to severe wear of belts, bowls and sliders, which is very damaging to the vehicle. This is also the reason why even if two people with different riding styles use the same scooter on the same route, the final fuel consumption will be different.

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