| 摘要 |
<p>PROBLEM TO BE SOLVED: To simultaneously perform cooling of an electric motor and contamination prevent of working oil by forming a housing of a hydraulic pump with a built-in electric motor as a metallic cylinder as an electric motor frame where a stator of the electric motor is installed inside, and separating the motor side space in the cylinder by a seal mechanism. SOLUTION: A housing is formed by a metallic cylinder 1 and end plates 2, 3, and a rotator 5 of an electric motor and a rotor 6 of a pump unit are respectively fixed on a rotating shaft 4 born by both end plates 2, 3 in the housing. A stator 7 of the electric motor is fixed in a position corresponding to the rotator 5 on the inner surface of the metallic cylinder 1, and further a case 8 of the pump unit is fixed to the front side end plate 2 to surround the rotor 6. The motor side space in the metallic cylinder 1 is separated from the space in the case 8 of the pump unit by an oil seal 9 as a seal mechanism mounted on the rotating shaft 4 in the tail end part of the case 8 of the pump unit to form the atmospheric space.</p> |
