Air compression apparatus

An air compression apparatus, comprising:

• a cylindrical body;
• an impeller which is provided inside the cylindrical body and rotatable by virtue of a wind flowed into the cylindrical body;
• a rotary shaft provided coaxially with the impeller and rotatable about the same axis as the impeller;
• a cylindrical casing accommodating at least a part of the rotary shaft;
• a rotation transmission mechanism that transmits the rotation of the impeller to the rotary shaft while increasing the rotation speed of the rotary shaft;
• a piston connected via a crank unit to the rotary shaft housed in the casing;
• a cylinder provided on the outer peripheral wall of the casing and accommodating a piston capable of reciprocating therein;
• an introduction unit provided in the cylinder for introducing air into the cylinder;
• and
• a discharge pipe connected to the cylinder for discharging a compressed air compressed by the piston inside the cylinder,
• wherein:
• the impeller is provided at one end of the cylindrical body on a wind downstream side,
• the rotary shaft is provided within the cylindrical body, extending from inside the impeller towards a wind upstream side,
• the cylindrical casing is provided within the cylindrical body, extending coaxially with the rotary shaft and accommodating a portion of the rotary shaft protruding from the impeller,
• the rotation transmission mechanism includes a planetary gear mechanism,
• a ring gear of the planetary gear mechanism is attached to a cylindrical rotary member forming a base of the impeller,
• a sun gear of the planetary gear mechanism is attached to the rotary shaft, and
• a planetary gear of the planetary gear mechanism meshes with the ring gear and the sun gear.