| 摘要 |
<p>PURPOSE:To decrease the operation cost in a motor enabling its life to be estimated by connecting a drain hole in a bottom surface of the motor to communicate with a through hole in a bottom surface of an oil tank by a discharge drain pipe and providing an air hole to be drilled in an upper surface of the motor. CONSTITUTION:An oil hydraulic pump unit 13 is manufactured by building a motor and an oil hydraulic pump and arranged to be immersed in oil in an oil tank 14. Drain holes 8, 8' in a bottom surface of this motor communicate with through holes 19, 19', provided in a bottom surface of the oil tank 14, by drain discharge pipes 20, 20', and a drain is always discharged to the outside of the oil tank 14. The motor provides in its upper surface an air hole 9 to be drilled. This air hole 9 provides an air pipe 22 through which the motor communicates in its inside with the atmosphere. Thus decreasing the operation cost, further by checking a discharged drain amount, the motor enables its life to be estimated.</p> |
