What is the working principle of the balance shaft of the engine?
There are many ways to eliminate vibration, such as using lightweight pistons, reducing the quality of moving parts, increasing the rigidity of the crankshaft, and adopting the V Type 90 cylinder arrangement engine with the angle of two degrees. But the common method used on motorcycle engines is to add a balance shaft to solve them. The balance shaft is simply a shaft with eccentric heavy blocks and rotates synchronously with the crankshaft. The reverse vibration force produced by the eccentric heavy block is used to make the engine obtain a good balance and reduce the vibration of the engine
When the piston moves up and down every time, the engine will generate two times up and down vibration, so the vibration frequency and the engine speed. In the vibration theory, often using multiple harmonic vibration to describe the vibration of the engine, the engine speed and vibration frequency of the same frequency is called a vibration, the engine speed is 2 times that of two order vibration, in turn, there are three order and four order vibration. But the higher the vibration frequency, the smaller the amplitude, more than 2 orders can be neglected. The first order vibration accounts for more than 70% of the total vibration, and is the main source of vibration
In the working cycle of the engine, the piston moves very fast and the speed is very uneven. At the top and bottom of the center, the piston speed is zero, while the top and bottom stops at the middle of the position, reaching the highest speed. As the piston moves repeatedly in the cylinder at high speed, it is sure to exert great inertia force on the piston, piston pin and connecting rod. The counterweight arranged on the connecting rod can balance the inertial force effectively, but only a part of the counterweight of the connecting rod is involved in the linear motion, and the other part is involved in rotation. In addition to the upper and lower stopping points, all kinds of inertial forces can not be completely balanced, resulting in vibration of the engine
Axle balance is used to balance and reduce the vibration of motorcycle engines, in order to reduce engine vibration, reduce engine noise, extend engine life, and enhance the comfort of occupants. As a patent, which is composed of YAMAHA (YAMAHA) motorcycle first use, has received the good effect, has a balance shaft used in the construction of YAMAHA every car, this is also its characteristics and selling, in similar models, it is undoubtedly the most quiet
