The transmission efficiency of KF series gear reducer usually refers to the ratio of output power (or output torque) to rated input power (or input torque multiplied by transmission ratio) when the rated input speed reaches the rated input power or input torque. The transmission efficiency of reducer should be measured on a special test stand. The test methods can be divided into direct power and loss power methods. The direct measurement power method is also divided into one direct power test and two straight measurement power method. The single direct measurement power method is a method to determine the efficiency by measuring the input and output torque and speed of the reducer directly on the test unit. It can have a larger deceleration ratio, the input axis and the output axis are not on the same axis, nor on the same plane. But the general volume is large, the transmission efficiency is not high and the precision is not high. The harmonic drive of harmonic SEW reducer is to transfer motion and power by flexible deformation controlled by flexible components. It has small volume and high accuracy, but the drawback is that its life is limited, it is not resistant to impact, and rigidity is relatively poor compared with metal parts. The transmission efficiency of gear reducer is generally more than 98%, the transmission efficiency of cycloidal pin wheel reducer is 90%, compared to that, worm gear reducer's transmission efficiency is the lowest, and the general maximum is only 75%. According to the principle of gear transmission, the two gear does not slip pure rolling at the nodes, and if the gear is rigid, the gear transmission is ineffective. However, the actual situation is that materials for making gears can not be rigid bodies, and there will inevitably be elastic deformation. When repeated elastic deformation occurs, energy consumption will be consumed. Moreover, the elastic deformation will make the gear meshing no longer be pure rolling theoretically, and there will be sliding friction. Moreover, the precision of actual manufacturing can not reach the theoretical precision, and the actual meshing is different from the theory, and it is no longer pure rolling. Also, the actual gear tooth surface non rigid body theory smooth and smooth factor, also affect the actual gear meshing.
The universal closed gear reducer is driven, and its lubrication is based on the circumferential speed of the gear. When the gear circumferential speed of V < 12m / s, often will be immersed in the oil bath lubrication gear in large gear. In this way, when the gear is driven, the lubricating oil is brought to the tooth surface of the meshing, and the oil is also thrown to the box wall to heat the heat. The depth of the gear immersed into the oil depends on the circumferential speed of the visible gear. For a cylindrical gear, it usually does not exceed one tooth height, but generally should not be less than 10mm. For a conical gear, it should be immersed in the full tooth width, and should be immersed in at least half of the tooth width. In a multistage gear drive, the oil can be taken to the tooth surface of the gear that is not immersed in the oil field by using the oil tanker. The amount of oil in the oil pool depends on the transmission power of the gear.
For the single stage transmission, the power of each transmission Ikw is about 0.35~0.7Lo for the multistage transmission, and the amount of oil needs to be increased exponentially. When the circumferential speed of the gear of the SEW reducer is more than 12m/S, fuel injection lubrication shall be adopted, that is, the oil pressure at the pump station or the central oil supply station will be supplied at a constant pressure, and the lubricant will be sprayed onto the meshing surface of the gear by the nozzle. When the V is less than or equal to 25m/s, the nozzle is located meshing into the side or a side can whistle; when v>25m/s, the nozzle should be located in the side of the tooth whistle, to borrow the lubricating oil in the gear meshing stiffness of cooling and lubrication of gear.