Electrically driven air pump having a drive motor balanced in situ

摘要

An electrically driven air pump having a pump mechanism in a first section of a housing and an electric motor in a second section of the housing in driving engagement with the pump mechanism. First and second end covers are sealingly secured on the housing. The electric motor is supported by elastomer rings in the housing. The pump mechanism has two axially spaced rotor wheels secured on the drive shaft of the motor and a stator wheel between the rotor wheels. The electric motor is balanced, in situ, in its mounted state by adjusting that one of the rotor wheels which is exposed in the housing prior to installation of the end cover on the first section of the housing. After the motor is balanced, the end cover is press fit on the housing and stator wheel to form air-tight, friction fit seal joints therebetween in which the engaged parts which are deformed elastically or plastically.