Gear assembly and gear oil composition

摘要

One embodiment may include a gear assembly comprising at least one pair of meshing gears situated inside a gear case having a sump portion and a wall portion. A gear oil mixture may be disposed at least in the sump portion. At least one gear is immersed partially or fully in the oil mixture. The oil mixture comprises a hydrocarbon oil base and a coolant having an endothermic liquid/vapor transition at a temperature between the lower and upper operating temperatures of the gear assembly.

主权项

1. A gear assembly comprising at least one pair of meshing gears situated inside a gear case having a sump portion and a wall portion constructed and arranged to provide a head space above the sump portion, and a gear oil mixture disposed in said sump portion; at least one of said gears being immersed at least partially in said mixture and said mixture comprising a base oil, and a coolant having an endothermic liquid/vapor transition between the lower and upper operating temperatures of the gear assembly, the coolant having a viscosity lower than the base oil, and a heat exchanger in an interior portion of the gear case constructed and arranged to fit in the head space, and the heat exchanger being constructed and arranged to condense coolant vapor into a liquid form.