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 straddles, curved beam motorcycles 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 and transmits it 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 speed change belt drive

In this way, the power is transmitted among the engine - the continuously variable transmission - 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 also consumes more fuel.

Transmission loss mainly comes from several aspects.

The first one 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:

Belt drive is prone to slippage and the transmission ratio is inaccurate

② Poor heat resistance, weak overload resistance, 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

The second is the friction of each transmission component. Such as the friction between the belt and the pulley, the friction of the bearings in the transmission system, etc. These frictions will convert part of the mechanical energy into heat energy and dissipate it into the air, resulting in the power not being fully transferred from the engine to the wheels. In the transmission system, the bowl and the flinging block are the major heat sources and also the areas with the greatest power loss.

From the start, the scooter is slippery. As the speed increases, the slider will be more firmly attached to the bowl. When pedaling, with frequent stops and starts, sudden acceleration, or running at full throttle, the belt and the flaps tend to slip the most. This situation can also easily cause the bowl to overheat, burn blue and cool down.

From the principle of pedal drive, it can be seen that the scooter can handle intense and stop-and-go driving modes. However, in this driving mode, whether it is the sliding friction of the main and driven belts at the front or the friction between the rear swingboard and the bowl, they will all change sharply and cause slippage.

To reduce power loss in a scooter, it is necessary to have a good driving habit, drive at a constant speed as much as possible, and minimize the power loss caused by the slippage of the belt and the paddle blocks. ❎ Wrong driving habits not only cause fuel consumption to be much higher than usual, but also cause the belt to wear out severely, the bowl and the swingblock to wear out severely, this is also the reason why even if two people ride the same scooter on the same route with different riding habits, the final fuel consumption will be different.

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