What are the common causes and solutions for oil leakage in other parts of NMRV110-60-0.55KW worm gear reducer
During the operation of the NMRV110-60-0.55KW worm gear reducer, if there is oil leakage in other parts (not at the output shaft oil seal), the common reasons are mainly concentrated in the failure of the joint surface seal, structural design defects, improper use and maintenance, etc. The following is a systematic analysis and solution:
1、 Classification of common causes of oil leakage
1. Sealing failure of the joint surface
Insufficient flatness or deformation: The machining accuracy of the joint surface between the box and the end cover is insufficient (such as flatness>0.1mm/m), or the casting is not annealed, resulting in deformation after the release of internal stress, causing a sealing gap.
Failure or improper assembly of sealant: uneven application of sealant, failure to tighten bolts in diagonal order, or aging and damage of sealing gaskets, resulting in leakage at static sealing points.
2. Unreasonable structural design
Ventilation hole blockage: When the gearbox is running, the temperature rises and the internal pressure increases. If the ventilation cap is blocked or the breathing valve fails, the oil will be squeezed out of the weak seal.
No oil return groove design: Lubricating oil accumulates at the shaft seal or end cover and cannot flow back in time, forming local high pressure and causing leakage, especially in vertical installation.
3. Usage and maintenance issues
Excessive lubricating oil: When the oil level exceeds the upper limit of the oil gauge and the oil is stirred vigorously during operation, the oil temperature rises and the pressure increases, causing leakage.
Incorrect oil selection: Using lubricating oil with low viscosity is prone to leakage from gaps; Ordinary mineral oil is prone to oxidation and deterioration in high-temperature environments, which affects its sealing performance.
2、 Targeted solutions
1. Repair the sealing of the joint surface
Scrape and grind the joint surface of the box to ensure a flatness of ≤ 0.05mm/m, and use anaerobic sealant (such as Loctite 515) to enhance the sealing effect.
Replace the aging sealing gasket and tighten the bolts evenly 2-3 times diagonally to avoid uneven local stress.
2. Optimize ventilation and oil return system
Upgrade the simple ventilation cap to a filter type breathing valve (filtration accuracy ≤ 10 μ m) and regularly clean it to prevent blockage.
Add oil return holes (diameter ≥ 8mm) at the bottom of the bearing chamber to ensure smooth flow of lubricating oil and reduce oil accumulation.
3. Standardize oil quantity and oil product management
Select appropriate viscosity oil according to working conditions:
-20 ℃~40 ℃: ISO VG 68~100 (such as Mobilgear 600 XP 68)
80 ℃: ISO VG 150~220 (such as Shell Omala HD 220)
Control the oil level within the range of ± 2mm from the centerline of the oil gauge, and it is recommended to maintain the position of the oil window at 1/2 to 2/3.
4. Using new repair materials (without dismantling)
For leakage of static joint surface, carbon nano polymer material can be used for online repair and directly applied to the leakage point, which has excellent adhesion, oil resistance and anti-aging performance to achieve rapid leak control.
