Patent ID: 8182253
Filing Date: 2012-05-22
Classification: F04C,Y10T

Abstract:
1. A multi-cylinder rotary compressor comprising: a rotary shaft which comprises a main shaft pivotally fixed to a main bearing, a countershaft pivotally fixed to a sub-bearing, crankshafts provided eccentrically between the main shaft and countershaft, and fitted with rollers, and a connecting part connecting adjacent crankshafts; and cylinder chambers which house the crankshafts and rollers of the rotary shaft in being eccentrically rotatable, wherein formulas (1) and (2) are established, wherein Rm represents a radius of the main shaft, Rs represents a radius of the countershaft, Rc represents a radius of the crankshaft, and e represents an eccentricity of the crankshaft, the connecting part which connects a first crankshaft provided in the main shaft and a second crankshaft provided in the countershaft, comprises: an A-periphery, which is positioned on the same level as an outer periphery of the second crankshaft, or inside the outer periphery, on a counter-eccentric side periphery of the second crankshaft, and has a radius greater than the radius Rs of the countershaft; and a B-periphery, which is positioned on the same level as an outer periphery of the first crankshaft, or inside the outer periphery, on a counter-eccentric side periphery of the first crankshaft, and has a radius greater than the radius Rs of the countershaft, and a formula (3) is established, wherein L represents an axial length of the connecting part, H represents an axial length of the roller fitted to the first crankshaft, Cr represents an axial length of a bevel formed at an inside peripheral edge of the roller fitted to the first crankshaft, and Cs represents an axial length of a bevel formed in the second crankshaft,