A clutch is a device that cuts off power between the engine and the speed reducer, and sometimes connects power, and transmits power by friction. For example, some motorcycles use a "single-plate clutch." The working principle is that the gear that rotates synchronously with the engine presses the friction plate connected to the speed reducer to transmit power, and when the friction wiper is released, the power transmission stops.
In the winter morning, it is often difficult to drive a car, low gears, and shifting gears. These are all related to the clutch, not the clutch or the transmission is broken. The wet multi-plate clutch of most motorcycle devices has a longer time for the clutch plate to be in the cold oil, and the cold oil has higher viscosity and lower fluidity, which causes the clutch to not normally cut off the power, but it can be solved by the warm car. Kind of things happen.
Motorcycles often use multiple friction plates that overlap each other and are called "multi-plate clutches." The number of friction plates is large, but the principle is the same as that of the single-plate clutch. The friction plates are pressed together by the force of the spring, and the power is transmitted by friction. The high-speed and high-torque engine of the motorcycle is used. Multiple friction plates reduce the clutch clearance and save space for the motorcycles that are limited by themselves. This is the most suitable way.
The multi-plate clutch is further divided into a plurality of wet clutches and a plurality of dry clutches. The wet clutch bubble is cooled in the oil, so the heat dissipation and wear resistance are better, and the operation can be smooth in the semi-clutch state, because the friction plate is immersed in the oil, the resistance is large and the power is not easily broken.
In contrast, the dry clutch has less resistance and is easy to disconnect the power, but the heat dissipation and wear resistance are not very satisfactory, and the noise is also relatively large without the oil. Therefore, dry clutches are only used in racing cars and some high performance models that pay special attention to performance. Most motorcycles are more durable and have a durable wet clutch.