What impact does the flatness error of the NGW-L92-25 planetary gearbox base have on the lifespan of the gearbox

The flatness error of the NGW-L92-25 planetary gearbox base can indirectly or directly shorten its service life by affecting the three core dimensions of gearbox installation accuracy, stress state, and motion stability. The specific influencing mechanism can be decomposed into the following four key aspects, and the larger the error, the more significant the impact:
1、 Disrupting the neutrality of the transmission system and exacerbating internal component wear
The core transmission structure of the planetary gearbox (sun gear, planetary gear, inner ring gear) needs to be strictly maintained
Coaxiality and center distance accuracy
The flatness of the base is a prerequisite for ensuring a tight fit between the reducer body and the installation foundation (such as equipment rack) and a flat installation reference surface

If the flatness error of the base seat is too large (such as local protrusions or depressions), the reducer body cannot fully fit the base during installation, which will cause the reducer to tilt or experience uneven local forces, resulting in a deviation of the meshing center distance between the sun gear and the planetary gear, and an "eccentric swing" during the operation of the planetary carrier.

This "asymmetric meshing" will cause a decrease in the contact area of the tooth surface (from "surface contact" to "local point/line contact"), an instantaneous increase in contact stress (far exceeding the design rated value), an accelerated wear rate of the tooth surface (such as early abrasive wear and tooth surface bonding), and at the same time, planetary gear bearings will also fail prematurely due to force imbalance, directly shortening the life of the transmission system.

2、 Inducing additional vibrations and impacts, accelerating structural fatigue damage
Flatness error can cause the "rigid connection" between the reducer and the base to become "non rigid contact", resulting in
Additional vibration excitation
：

When the gearbox is running under load, the unevenness of the base plane will cause uneven force on the installation bolts (some bolts are overloaded, and some bolts are not fully fitted), resulting in "slight amplitude jumping" or "periodic shaking" of the gearbox body;

This vibration will be transmitted to internal transmission components such as gears, bearings, and output shafts. On the one hand, it will intensify the "impact wear" of the tooth surface (increasing the instantaneous impact force during meshing), and on the other hand, it will cause "loosening wear" on the joint surface of the parts (such as the fitting between the planetary carrier and the output shaft). Long term accumulation will cause fatigue cracks in the parts (such as cracks in the gear root and outer ring of the bearing), ultimately leading to part fracture and the scrapping of the reducer.

3、 Causing seal failure and introducing impurities to exacerbate internal pollution
The output and input ends of the NGW-L92-25 planetary gearbox are usually equipped with
Oil seal or sealing ring
The sealing effect depends on the coaxiality between the gearbox housing and the rotating shaft, as well as the smooth fit of the installation surface

If the flatness error of the base seat is too large, the gearbox housing may tilt or deform, resulting in uneven radial fit clearance between the sealing components (such as oil seals) and the rotating shaft - excessive clearance in some areas (seal failure) and insufficient clearance in some areas (excessive wear of the sealing components);