Patent ID: 6592339
Filing Date: 2003-07-15
Classification: F04B

Abstract:
A pump device including a drive source, a drive transmission portion that is engaged with the drive source, a pump portion that includes an air chamber comprising a diaphragm/bellows engaged with a drive member of the drive transmission portion, and a suction/exhaust portion that includes a suction valve and an exhaust valve, each of which communicates with the air chamber of the pump portion, wherein the drive transmission portion has a cylindrical member, rotatably-supported about a rotation axis on a drive output shaft of the drive source, a cam portion formed on a peripheral circumferential surface of the rotary cylindrical member so as to have a sinusoidal configuration around the circumference of the rotary cylindrical member so as to define a sinusoidal movement in the direction of the rotation axis as the cylindrical member is rotated, and one end of said drive member engages with the cam portion and a second end of said drive member is pivotably supported by a part of the pump portion; and the air chamber is constructed so that an internal volume thereof may be compressed and expanded according to displacement movements of said drive member which engages the diaphragm/bellows of the air chamber and responds to rotation movements of the cam portion.