RYO OIL SEAL The modification of the truck engine

In the power system of heavy-duty trucks, oil seals are used in various components such as the engine, transmission, and axle. Their function is to maintain a stable and clean operating environment over a long period. For heavy trucks with a mileage of tens of thousands of kilometers, even a minor leak can cause significant economic losses. And the oil seal is the key component that prevents such problems from occurring.

The working environment and performance requirements of heavy truck oil seals
Heavy-duty truck oil seals are mainly used in engine crankshafts, transmission input shafts, rear axle hubs, and hydraulic systems, etc. The common characteristics of these areas are high temperature, high speed, and frequent pressure changes. The oil seals must simultaneously possess wear resistance, high-temperature resistance, anti-corrosion properties, and good rebound performance in order to maintain the sealing effect during long-term operation.

For instance, the oil seal at the end of the engine crankshaft has to withstand the high-speed flushing of lubricating oil and temperature fluctuations, while the oil seal at the wheel end is more prone to erosion by external factors such as sand, water vapor, etc. The selection of materials for different parts of the oil seals varies:
The engine and transmission often use fluororubber (FKM) or hydrogenated nitrile butadiene rubber (HNBR), which can withstand high-temperature oils and resist oxidation and aging.
In the case of wheel ends and heavy-load scenarios, it is more advisable to use nitrile rubber (NBR) or polytetrafluoroethylene (PTFE) composite materials, which possess both flexibility and wear resistance characteristics.
For vehicles operating under more challenging conditions, such as mining trucks or port haulers, some oil seals will adopt a metal frame and double lip design to enhance their support and protection capabilities.
The matching between the sealing lip of the oil seal and the shaft surface is also crucial. If the installation is improper, there is insufficient lubrication, or the roughness of the shaft surface exceeds the standard, it will cause early leakage or erosion of the lip. Therefore, during installation, special tools should be used to ensure the coaxiality of the shaft center, the proper application of oil to the lip, and the flatness of the outer ring during press-fitting, avoiding eccentricity and excessive force.

RYO OIL SEAL The modification of the truck engine

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