Patent ID: 6471490
Filing Date: 2002-10-29
Classification: F04B,Y10T

Abstract:
A piston type compressor comprising:a housing having cylinder bores, a suction chamber, a discharge chamber, suction ports and discharge ports formed therein; pistons reciprocatingly arranged in said cylinder bores; a drive shaft rotatably supported by said housing; a transmission mechanism operatively coupled to said drive shaft and said pistons for converting rotation of said drive shaft into reciprocal movement of the pistons; suction valves to open and close the suction ports; discharge valves to open and close the discharge ports; wherein each said suction valve has a proximal end portion and a distal end portion on the opposite side of the proximal end portion, said distal end portion of said suction valve having an outer contour line including a distal end forming line located near a circumferential surface of said cylinder bore and side lines located on either side of said distal end forming line, each said suction port having a contour line including a distal end line located near the circumferential surface of the cylinder bore and side lines located on either side of said distal end line; and said distal end forming line of said suction valve and said distal end line of said suction port being arranged along said circumferential surface of said cylinder bore, so that a gap between said distal end forming line and said distal end line with respect to a radial line of a circle forming the circumferential surface of the cylinder bore is substantially constant and a gap between said distal end forming line and said circumferential surface of said cylinder bore with respect to said radial line is substantially constant.