Air Compressor

An air compressor comprising:

• a compressor body that compresses air;
• an electric motor as a power source for the compressor body;
• a gear mechanism that transmits power of the electric motor to the compressor body;
• a gear casing that is connected between a casing of the compressor body and a casing of the electric motor and houses the gear mechanism;
• a partitioning wall that defines an internal space of the gear casing and an internal space of the casing of the electric motor;
• a non-contact type visco seal that is provided to a gap in a portion where a rotating shaft of the electric motor penetrates through the partitioning wall and that prevents intrusion of lubricant in the gear casing into the casing of the electric motor;
• and
• a communication hole that communicates between a gap from the visco seal toward the electric motor in the partitioning wall and an outside of the air compressor not through the internal space of the casing of the electric motor.