Patent ID: 9670916
Date: 2017-06-06
CPC Classifications: F04B

Claim:
1. A compressor comprising: a motor; a piston reciprocating by the motor; a crankcase including a middle wall portion having a first communication hole, and the crankcase housing the piston; a printed circuit board arranged between the crankcase and the motor; a cylinder body enclosed within the crankcase and secured to an inner surface of the middle wall portion, the cylinder body and the middle wall portion defining a cylinder chamber having a diameter, and reciprocation of the piston increasing or decreasing a capacity of the cylinder chamber; and a cylinder head secured to an outer surface of the middle wall portion, and the cylinder head and the middle wall portion defining an exhaust chamber having a diameter, the exhaust chamber communicating with the cylinder chamber through the first communication hole, wherein: the outer surface of the middle wall portion to which the cylinder head is secured is flat, the cylinder head being smaller than the outer surface, the exhaust chamber diameter matching in size with the diameter of the cylinder chamber, the crankcase includes an upper wall portion and a lower wall portion, the upper wall portion and the lower wall portion respectively holding first and second bearings, the crankcase has a rectangular shape when viewed in an axial direction of the motor, the upper middle wall portion and the wall portion are integrally formed with each other, and the motor is an outer rotor type motor arranged outside of the crankcase.