Patent ID: 6461127
Filing Date: 2002-10-08
Classification: F01C

Abstract:
A fluid suction and exhaust apparatus using coaxial rotary pistons, comprising:a housing 2 including: a cylinder 12 having a plurality of exhaust holes 24 and 24a and a plurality of suction holes 25 and 25a disposed oppositely to each other on the sidewall thereof; sealing plates 14a and 14b covering both ends of the cylinder 12, respectively, to form a chamber in the cylinder 12; and ring gears 21a and 21b fitted in an axial bore of each sealing plate 14a, 14b, each ring gear 21a, 21b having an internal gear 22a, 22b on the inner sidewall thereof; a piston block 4 including: a couple of rotary pistons 16a and 16b coupled coaxially with each other, each rotary piston 16a, 16b formed generally in an annular disk with an axial bore to be rotatably received in the cylinder 12 and having an annular space 30; and a plurality of wing plates 17 and 18 protruded radially outwardly on the outer sidewall thereof to be slidably contact with the inner sidewall of the cylinder 12 and partition the chamber of the cylinder 12 into a plurality of suction chambers and exhaust chambers A; an actuator device 6 including: a crankshaft 15 axially passing through the cylinder 12 and rotatably supported at both ends on the axial bore of the sealing plates 14a, 14b; a crank pin 15a formed eccentrically to the axis of the crankshaft 15 to be located in the annular space 30 of the rotary pistons; and a connecting rod 40 sleeved on the crank pin 15a to connect said two rotary pistons 16a and 16b to each other and having at least one external gear 42a, 42b internally meshed with the internal gear 22a, 22b of the ring gear 21a, 21b.