Multi-cylinder rotary compressor and refrigeration cycle equipment

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 (4) and (5) are established, assuming the radius of the main shaft of the rotary shaft to be Rm, the radius of the countershaft to be Rs, the radius of the crankshaft to be Rc, and the eccentricity of the crankshaft to be e,
• Rc<Rm+e (4)
• Rc≧Rs+e (5)
• the connecting part which connects a first crankshaft provided in the main shaft and a second crankshaft provided in the countershaft, comprises:
• an A0-periphery, which is positioned on the same level as the outer periphery of the second crankshaft, or inside the outer periphery, on the counter-eccentric side periphery of the second crankshaft, and has a radius greater than the radius Rs of the countershaft, and an A1-periphery, which is positioned outside the counter-eccentric side periphery of the second crankshaft, between the A0-periphery and first crankshaft, and
• a B0-periphery, which is positioned on the same level as the outer periphery of the first crankshaft, or inside the outer periphery, on the counter-eccentric side periphery of the first crankshaft, and has a radius greater than the radius Rs of the countershaft, and a B1-periphery, which is positioned outside the counter-eccentric side periphery of the first crankshaft, between the B0-periphery and second crankshaft, and
• the outermost diameter So of the A1 and B1 peripheral surfaces is made smaller than the inside diameter Ri of the roller fitted to the first crankshaft,
• the axial intermediate part of the connecting part is formed by the A0 and B0 peripheral surfaces, and
• formulas (6) and (7) are established, assuming the axial length of the A0-periphery to be Ka, the axial length of the B0-periphery to be Kb, the axial length of the roller fitted to the first crankshaft to be H, the axial length of the bevel formed at the inside peripheral edge of a roller fitted to the first crankshaft to be Cr, and the axial length of the bevel formed in the second crankshaft to be Cs,
• H>Ka≧H−Cr−Cs (6)
• H>Kb≧H−Cr−Cs (7)

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 (8) and (9) are established, assuming the radius of the main shaft of the rotary shaft to be Rm, the radius of the countershaft to be Rs, the radius of the crankshaft to be Rc, and the eccentricity of the crankshaft to be e,
• Rc<Rm+e (8)
• Rc≧Rs+e (9)
• the connecting part which connects a first crankshaft provided in the main shaft and a second crankshaft provided in the countershaft, comprises:
• an A0-periphery, which is positioned on the same level as the outer periphery of the second crankshaft, or inside the outer periphery, on the counter-eccentric side periphery of the second crankshaft, and has a radius greater than the radius Rs of the countershaft, an A1-periphery, which is positioned outside the counter-eccentric side periphery of the second crankshaft, between the A-periphery and first crankshaft, and a first inclined surface formed in a step between the peripheral surfaces A0 and A1, and
• a B-periphery, which is positioned on the same level as the outer periphery of the first crankshaft, or inside the outer periphery, on the counter-eccentric side periphery of the first crankshaft, and has a radius greater than the radius Rs of the countershaft, a B1-periphery, which is positioned outside the counter-eccentric side periphery of the first crankshaft, between the B0-periphery and second crankshaft, and a second inclined surface formed in a step between the B0 and B1 peripheries.