Abstract: An electric-motor/hydraulic-pump assembly in which an electric motor has a motor housing and a motor drive shaft, and a hydraulic pump is mounted directly to one end of the motor housing and internally coupled to the shaft to form a unitary assembly in which vibration generated by operation of the pump is transmitted to the motor housing. Support feet are affixed to the motor housing for mounting the motor/pump assembly to underlying support structure, and sound deadening ferrules are interposed between the motor housing and the support feet to inhibit transmission of structureborne noise from the motor housing to the support structure. The motor and pump are surrounded by a sound enclosure to inhibit radiation of airborne noise into the surround atmosphere. Fluid is drawn through an inlet in the sound enclosure and through the motor housing to cool the motor, and then pumped to a fluid outlet in the enclosure.

Abstract: An electric motor driven inline hydraulic apparatus comprising a housing having end members closing said housing, an electric motor stator mounted in said housing, an electric motor rotor, a shaft on which the rotor is mounted is journalled in the housing and a pump is integrally formed on one or both of the end members. The shaft extends through an opening in the end member and is connected to the rotating group of the pump. Hydraulic fluid is supplied to the interior of the electric motor housing and flows through passages in the housing to the intake of the pump integral with the end member. The end member associated with the pump is formed with an enlarged chamber adjacent the inlet of the pump which functions to reduce the flow velocity and separate the contained air from the hydraulic fluid thereby reducing the operating sound level of the pump.