Scroll compressor with axial vibration prevention for a shaft bearing

A scroll compressor comprising:

• a closed container;
• an electric motor disposed in an upper portion of an interior region of said container and comprising a rotor and a stator;
• a crank shaft supporting said rotor and comprising a first end defining a main shaft, a second end, a main bearing supporting said main shaft and a rolling type upper bearing supporting said second end and comprising an inner race and an outer race;
• an eccentric bearing eccentrically disposed inside said main shaft;
• and
• a compression mechanism disposed in a lower portion of the interior region of said container and driven by said electric motor through said crank shaft,
• said compression mechanism comprising:
• a stationary swirl vane member including a stationary frame body formed with stationary swirl vanes thereon,
• a revolving swirl blade member including a revolving end plate having a first side formed with revolving swirl blades thereon and a second side opposite to said first side, said revolving swirl blades meshing with said stationary swirl vanes for defining a plurality of compression work rooms,
• a rotation preventing member for preventing rotation of the revolving swirl blade member on its own axis but still allowing a revolving motion of said revolving swirl blade member,
• a revolving motion drive shaft for revolving said revolving swirl blade member, said revolving motion drive shaft being formed on said second side and fitted in said eccentric bearing, and
• a rise preventing plate, provided above said upper bearing, for preventing the crank shaft from excessively rising upwards,
• said crank shaft further comprising a stepped portion wherein a diameter of a shaft portion at which said rotor is supported is stepwise greater than a diameter of said second end that is supported in said upper bearing, and an elastic member provided between said stepped portion and the inner race of said upper bearing, wherein a narrow clearance is provided between said rise preventing plate and said second end portion of said crank shaft.