1
role
let the engine up and running more stable and smooth.
2
Principle
during the working cycle of the engine, the piston velocity is very fast, and the speed is very uneven. The upper and lower dead center position, the piston velocity is zero, and the upper and lower dead center position of the highest speed. Repeated as do high-speed linear motion in the cylinder of the piston, must have a great inertial force on the piston, piston pin and connecting rod. Disposed on the link weights can effectively balance the inertial force, but only a part of the moving mass of the counterweight connecting rod linear motion participation, partial participation further rotation. In addition to the upper and lower dead center position, the various inertial force can not be completely balanced, the engine vibration is generated.
when the piston is moved up and down each time, the engine will produce about twice on a vibration, the vibration frequency and the engine rotational speed of the engine concerned. In theory called vibration, often used to describe a plurality of harmonic vibration of the vibration of the engine, wherein the vibration frequency and the same first-order vibration of the engine speed, the engine speed is twice the frequency of vibration is called second order, and so on, there are third-order , fourth-order vibration. However, the higher the vibration frequency, the amplitude of the smaller, second order or more negligible. First-order vibration accounted for more than 70 percent of the whole vibration is the main source of vibration.