| 摘要 |
<p>A hydraulic pump with a built-in electric motor wherein an electric motor and a pump unit that are disposed in tandem are stored in a common housing. In this pump, the housing in the form of an electric motor frame having an electric motor stator internally attached thereto is composed of a rectangular parallelepiped metal box. The space in the box on the side of the electric motor is an atmospheric space separated from the inner space of the pump unit by a seal mechanism. The metal box has at least one hydraulic oil receiving chamber formed in the peripheral wall, and connected to this hydraulic oil receiving chamber are a passage for receiving return oil from the outside and a passage leading to the suction port of the pump unit. The cooling of the built-in electric motor and the prevention of hydraulic oil from being contaminated by the rotation of the electric motor can be simultaneously achieved, without any possibility of electrical troubles with the built-in electric motor even if water-containing hydraulic oil or aqueous hydraulic oil is fed and discharged.</p> |
