Abstract
Lubrication is important for the sake of operate the gear unit. Friction heat have a close relation with gear damage. The generating heat can be dissipated to lubricating oil by lubrication. The viscosity of the lubricating oil is related to lubricating, but it varies with temperature. This study focuses on lubricating oil temperature in gear box. Authors measured a rise in lubricating oil temperature in bath lubrication. Experimental apparatus is gear unit of power circulation system. It was measured lubricating oil temperature in gear box using thermocouple. It changed lubricating oil, load torque and rotational frequency in the experiment. It was found that lubricating oil temperature rises as load torque, rotational frequency and viscosity increases by the experiment. Also calculated a film thickness from the measured lubricating oil temperature, it was found that film thickness reduce as lubricating oil temperature rises. Lubrication form is changed from fluid friction to dry friction by reduce film thickness. It has shown that it is necessary to pay attention to the temperature of the lubricant. Because not maintain proper lubrication.
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