Air Compressor

Abstract

To provide a technique that enables recovery of oil stored in a gear casing without using a pump. A compressor 100 includes: a rotor 9 that compresses air; an electric motor 42 that drives the rotor 9; a gear that transmits the drive of the electric motor 42 to the rotor 9; a gear casing 22 that houses the gear; an oil tank 11 that stores oil separated from the compressed air; an oil supply passage 25 that extends from the oil tank 11 to the gear casing 22; an oil recovery passage 26 that extends from the gear casing 22 to a compressor intake portion 20; and an oil pressurizing passage 27 that extends from a discharge port 14b to the gear casing 22. Oil is supplied from the oil tank 11 to the gear casing 22 via the oil supply passage 25 by discharge pressure of the compressor 100, and the gear casing 22 is pressurized via the oil pressurizing passage 27 by the discharge pressure, thereby recovering oil from the gear casing 22 to the compressor intake portion 20 via the oil recovery passage 26.

Dependencies are inferred from the claim text.