| 摘要 |
<p>A scroll compressor in such a structure that: a main shaft formed on one end of the crank shaft (6) for revolution-driving the revolving vortex blade members (11) is supported by the main bearing; a revolving driving shaft (16) formed on the side opposite to the revolving vortex blades (11) of a revolving end plate (12) is fitted into an eccentric bearing eccentrically provided inside the main shaft of the crank shaft (6); the crank shaft (6) is coupled to the rotor (5) of the motor (3); an end of the crank shaft (6) opposite to the main shaft thereof is supported by a roller type upper bearing (21); a floating-suppressive plate (24) for preventing excessive upward floating of the crank shaft (6) is fixedly disposed on the underside of the upper bearing (21); the crank shaft (6) is stepped to be larger in diameter at a part thereof coupled to the rotor (5) than at a part fitted in the upper bearing (21) and is fixed to a support member supported by both end surfaces of the inner race of the upper bearing (21) while hoisted by a fixing member; and a minute gap is formed between the stepped part A of the crank shaft (6) and floating-suppressive plate. Since weight of the crank shaft system acts as pre-stress on the inner race of the roller type upper bearing (21), abnormal noise from the upper bearing (21) caused by axial vibration of the shaft system and resonance can be prevented.</p> |
