5-2 Lower Mechanism: Travel Drive Unit 8. Reduction Gear Lubricating Oil Reduction gear lubricating oil is essential for drive force transmission and lubrication of reduction gear parts. Improper selection or handling of reduction gear lubricating oil may cause a problem, such as "expected performance of the reduction gear cannot be achieved" or "the reduction gear life is extremely shortened." Therefore, it is important to fully understand the following before selecting and handling reduction gear lubricating oil.
[1] Functions of and requirements for reduction gear lubricating oil Reduction gear lubricating oil has the following functions: (1) Forming oil film between metals to provide reduced friction and smooth lubrication between them so that the driving force will not be lost. (2) Forming oil film between metals to provide smooth lubrication between them so that the gear will not be damaged by wear or scorching (3) Providing smooth lubrication between metals to prevent temperature rise caused by frictional heat. (4) Preventing rust and corrosion caused by entry of water or other reasons. To fulfill all these functions, the following properties are required for the reduction gear lubricating oil. (1) High oil film strength. (good extreme-pressure properties.) (2) Appropriate viscosity and high viscosity index. (3) Good oxidation stability. (4) Good antifoam properties. (5) Good antirust properties. (6) Good low-temperature fluidity. (7) Good water separation. (8) Less corrosive. (9) Does not affect on the seal material. Select reduction gear lubricating oil that meets the requirements above.
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