Electrically driven compressor mounted on a vehicle engine having a weight inside to shift the resonance frequency of the compressor from that of the engine

An electrically-driven compressor for a vehicle configured to be installed on an engine, comprising:

• a compression unit in which refrigerant is compressed with rotation of a rotating shaft;
• an electric motor which is coupled to the rotating shaft and drives the compression unit through the rotating shaft;
• a motor drive circuit which drives the electric motor;
• and
• a housing which accommodates the compression unit, the electric motor, and the motor drive circuit aligned in listed order in an axial direction of the rotating shaft,
• the housing being internally provided with a discharge chamber through which the refrigerant compressed by the compression unit is discharged,
• the housing including a weight which is attached to the housing and disposed in the discharge chamber in a manner that a resonance frequency of the electrically-driven compressor is shifted relative to a resonance frequency of the engine where the electrically-driven compressor is installed, the weight composed of a material having a specific gravity greater than a specific gravity of a constituent material of the housing, wherein
• the housing includes an inner peripheral wall and an end wall connected to the inner peripheral wall, the inner peripheral wall and the end wall defining the discharge chamber,
• the weight is attached to the end wall,
• the weight is fastened to the end wall by a screw,
• the weight includes a first weight portion and a second weight portion that are fan-shaped, and a coupling member coupling the first weight portion and the second weight portion,
• the coupling member having a through-hole in which the screw is inserted,
• the housing is internally provided with an oil separation chamber in which an oil separator cylinder is disposed, the oil separation chamber being in communication with the discharge chamber,
• the end wall is provided with a female screw which is threadedly engaged with the screw,
• the female screw is provided, overlapping with a partition between the discharge chamber and the oil separation chamber in the end wall,
• each of the first weight portion and the second weight portion is disposed in a portion of a space of the discharge chamber, the portion of the space formed along a bulging portion of the partition that bulges out in the axial direction towards the discharge chamber, and
• the bulging portion is a portion of the end wall that defines a portion of the discharge chamber and constitutes a portion of a peripheral wall of the oil separation chamber.