How to choose seals for WPX155-20-B worm gear reducer
Publish Time: 2026-09-29 Origin: Site
WPX155-20-B worm gear reducer seal Selection needs to be comprehensively evaluated based on the equipment structure, working environment, and lubricant type. The following are detailed Selection key points:
1. Selection of seal type
The shaft extension end seal is preferably a TC-type skeleton oil seal for the shaft extension position. It is spring-pressed with a double-lip structure, taking into account both dustproof and oil leakage prevention. It is suitable for medium and low-speed working conditions with a shaft diameter of 50–200mm. The input shaft diameter of WPX155-20-B reducer is 40mm and the output shaft diameter is 60mm, both of which are suitable for TC skeleton oil seals. If the on-site sealing requirements are higher, an oil seal with a return groove can be selected; when the linear speed of the shaft surface is greater than 12m/s, the return groove oil seal can significantly reduce lubricating oil leakage.
The joint surface of the box body is sealed. Asbestos-free sealing gaskets are recommended for the joint surface of the box cover and box base. The material has excellent compression resilience and can compensate for the small gap on the casting joint surface, making it easy to disassemble and maintain. Sealant can also be applied to the joint surface to further improve sealing reliability.
Bearing chamber and bearing cover seal The inside of the bearing chamber and the bearing cover are sealed with O-rings. It has a simple structure, easy assembly, and economical cost. It can prevent lubricating oil from leaking and prevent dust and water vapor from entering the bearing cavity.
2. Sealing materialsSelection
Nitrile rubber NBR applicable working conditions: working temperature range - 40℃~120℃, use ordinary mineral-based lubricating oil. The advantages are oil resistance and wear resistance, and high cost performance. It is the preferred sealing material for WPX155-20-B under normal working conditions.
Fluorine rubber FKM applicable working conditions: working temperature 120℃~200℃, using synthetic ester oil or lubricating oil with various chemical additives added. It has strong resistance to high temperature, oil and chemical corrosion, suitable for high temperature and harsh working conditions, and has stable sealing performance.
Polytetrafluoroethylene PTFE Applicable working conditions: Strong chemical corrosion environment, or occasions requiring low friction operation. It has strong chemical inertness and self-lubricating properties. The friction coefficient is only 0.05-0.1, which reduces the wear of shafts and seals and reduces oil leakage failures.
3. Checking working conditions
The temperature conditions need to consider both the ambient temperature and the internal oil temperature of the reducer. For continuous full-load, high-temperature operation, fluororubber is preferred; low-temperature conditions require ensuring the low-temperature toughness of the sealing material to prevent low-temperature hardening and cracking.
Pressure conditions WPX155-20-B worm gear reducer has low internal pressure during normal operation. The internal pressure of the box will rise when the load is heavy or the operating conditions fluctuate greatly. It is recommended to use an oil seal with a metal skeleton or a pressure-resistant O-ring to improve the pressure resistance.
Speed condition WPX155-20-B The input speed can reach 1440rpm, and the output speed is 24~144rpm. The shaft extension seal needs to calculate the linear speed of the shaft: nitrile rubber and EPDM rubber seals are sufficient for low-speed working conditions; PTFE or polyurethane materials are recommended for high linear speed conditions, as they have better wear resistance.
4. Installation precautions
The service life and sealing effect of seals largely depend on the installation process. Before assembly, clean the installation position to ensure that the shaft surface is smooth and free of burrs and scratches to prevent scratches on the sealing lip; strictly control the installation direction and assembly dimensions of the seals, and standardize operations to avoid oil leakage caused by improper assembly.