Because hydraulic excavator is driven by hydraulic system, chemical energy can be converted into mechanical energy. The energy loss in the process of energy transmission is inevitable, including mechanical loss.
Mechanical loss is inevitable in actual situation, and can only be minimized. In the actual working environment, as long as friction and relative motion exist, mechanical loss will be caused. When hydraulic excavator works, energy loss occurs due to friction, which mainly occurs in the parts with frequent friction, such as piston and engine of hydraulic cylinder. Because of the frequent movement of these parts, the mechanical loss is huge, and there will be a lot of extra heat, which requires cooling system. But it is worth noting that with the increase of working strength of hydraulic excavator and the increase of engine speed, the energy loss of diesel engine friction will increase continuously. Therefore, hydraulic excavator can not be loaded for a long time, not only reduces its service life, but also reduces working efficiency and increases cost.
