1. Transmission efficiency: output power decreased
Transmission efficiency is a critical metric for evaluating gear reducers.
Although professional equipment is required to test transmission efficiency, customers may find it difficult to measure specific data. However, a comparative analysis is feasible.
Heat is the most direct indication. Our understanding of physics tells us that energy is conserved. If there is significant heat dissipation, it means more engine power is being used to overcome friction, which results in decreased power output.
When power output decreases, load capacity decreases, leading to lack of power, reduced acceleration and slower cycle times.
2. Shelf life: time determines quality
The service life of a reducer largely depends on the service life of its bearings. Typically, the bearings wear out first, especially in harmonic reducers.
In RV reducers, the planetary structure is also a common point of failure. Premature wear typically appears within a few months to a year, depending on usage.
So gearbox manufacturers looking to capitalize on the growing demand for robots should take note.
3. Heat Generation: Precision versus Heat
The accuracy of a reducer depends on the level of engagement of its gears. A large gap in the mesh means reduced accuracy. Using a light interference fit improves accuracy but may cause excessive heat.
For RV reducers, the difference in heat generation between different structures is not as pronounced.
However, for harmonic reducers, heat generation varies significantly between brands. Among them, HD stands out as the only manufacturer that can achieve high precision and at the same time minimize heat.
4. Accuracy: a key metric for gear reducers
Two types of accuracy are addressed here: angular transmission accuracy, which is always indicated in reducer manuals and affects the absolute accuracy of robot positioning; and repeatability accuracy, which is not listed in manuals but influences the robot's repetitive positioning accuracy.
Gearbox manufacturers often have specialized equipment to measure angular transmission accuracy, but customers can also develop simple test methods. The same applies to repeatability accuracy.
5. Oil leak: how to distinguish between real and fake leaks?
Regardless of the type of reducer, oil leakage is an inevitable problem. The reasons for leakage are multifaceted, involving the brand of oil seal, assembly, shaft machining processes, usage methods, and more.
There are real and fake leaks. False leak refers to small oil leaks immediately after operation, which stop after a short period. This usually occurs due to the release of internal pressure.
The timing of the actual leak varies; It may occur immediately, indicating possible product or assembly quality issues, or after prolonged use, typically pointing to the service life of the oil seal. Misuse is another possible cause.
