Oilless compressor

An oilless compressor comprising:

• a compressor body having a rotor for compressing air, a rotor shaft for supporting the rotor and a bearing for rotatably supporting the rotor shaft;
• an electric motor that generates driving force for driving the compressor body;
• at least one gear that transmits the driving force to the rotor shaft;
• a lubricating oil piping that feeds lubricating oil to at least either the bearing or the at least one gear;
• and
• an oil pump that pumps the lubricating oil, wherein
• the electric motor includes a cooling jacket in an outer circumferential direction of an armature of the electric motor, the cooling jacket circulating the lubricating oil into an internal flow path, thereby cooling the armature, and
• the electric motor circulates the lubricating oil into the cooling jacket and the lubricating oil piping,
• the cooling jacket has a lubricating oil outlet on an upper side and a lubricating oil return port on a lower side of the cooling jacket.

An oilless compressor comprising:

• a compressor body having a rotor for compressing air, a rotor shaft for supporting the rotor and a bearing for rotatably supporting the rotor shaft;
• an electric motor that generates driving force for driving the compressor body;
• at least one gear that transmits the driving force to the rotor shaft;
• a lubricating oil piping that feeds lubricating oil to at least either the bearing or the at least one gear;
• and
• an oil pump that pumps the lubricating oil, wherein
• the electric motor includes a cooling jacket in an outer circumferential direction of an armature of the electric motor, the cooling jacket circulating the lubricating oil into an internal flow path, thereby cooling the armature,
• the electric motor circulates the lubricating oil into the cooling jacket and the lubricating oil piping, and
• the oilless compressor further comprises an atmosphere communicating part communicated with outside air on an upper side of the cooling jacket.