How to determine the degree of aging of the sealing components of R137-103.2-11KW helical gear reducer

To determine the aging degree of the sealing components of R137-103.2-11KW reducer, it is necessary to combine four dimensions: appearance inspection, operating parameter monitoring, disassembly verification, and working condition life evaluation. The following systematic methods should be used to determine:

1. Visually inspect the leakage and oil accumulation at the sealing area

The core characteristic of seal aging is the deterioration of sealing performance, which is directly manifested as lubricating oil leakage. Firstly, stop the machine for cooling and thoroughly clean the oil stains at key sealing positions such as the output shaft, input shaft oil seal, box joint surface, and end cap bolt perimeter of the reducer with cleaning agent. Afterwards, start the gearbox and run it without load for 1 hour. During this period, observe the cleaned parts every 15 minutes. If there are oil stains infiltrating the shaft head oil seal, oil droplets seeping out of the box joint surface, or oil accumulation around the bolt holes, and leakage marks appear again within a short period of time after wiping, it can be determined that there is an aging problem with the seal. For high torque reducers like R137, the output shaft is subjected to greater force, and the oil seal lip is prone to loss of elasticity due to aging, resulting in leakage due to loose fit. After the joint surface gasket ages, it will also be unable to fill gaps due to decreased rigidity, leading to leakage.

2. Check the physical condition of the seals after disassembling and stopping the machine

Stop the machine, cut off the power, and drain the lubricating oil from the box. Remove the oil seal cover, end cap, and other components, and take out the skeleton oil seal, sealing gasket, and other sealing components for detailed inspection. Aging skeleton oil seals will exhibit significant material degradation, with the lip area cracking, hardening, and becoming brittle. There will be no rebound sensation when pressed by hand, and the rubber surface will show mesh cracks or debris. The skeleton and rubber body may detach and detach, and the spring coil of the oil seal will also lose tension due to corrosion; The sealing gasket on the joint surface of the box will undergo shrinkage deformation, hardening and brittleness, and the sealing pattern on the surface will be ground flat, and even local damage may occur. If the size of the seal shrinks, there is a significant gap between it and the installation groove, or the rubber hardness exceeds 20% of the new part, it is considered severe aging and needs to be replaced immediately.

3. Monitor abnormal changes in oil temperature and noise during operation

The aging of seals can indirectly cause abnormal operating parameters of the gearbox, and the degree of aging can be determined by monitoring oil temperature and noise. Under normal operating conditions, the operating oil temperature of R137 reducer should be stable at 40 ℃~60 ℃. If the aging of the sealing components leads to lubricating oil leakage, the decrease in oil level in the box will cause insufficient lubrication of the gears and bearings, resulting in abnormal oil temperature rise, exceeding 75 ℃ or even reaching over 80 ℃; At the same time, seal failure can cause external dust and moisture to invade the box, contaminate the lubricating oil, and exacerbate internal component wear. During operation, there will be a "rustling" or "buzzing" noise that is different from the normal meshing sound, and the noise gradually increases with the extension of operation time. Comparing the baseline parameters of the initial operation of the equipment, if the oil temperature continues to be high and the noise is significantly abnormal, after excluding factors such as gear wear and bearing failure, it can be pointed to the aging of the sealing components.