Co-rotating Scroll Compressor Bearing Load via Gravity Offset

The patent deliberately creates asymmetric mass distribution by shifting the center of gravity of the driving-side or driven-side scroll away from the rotation center. This asymmetric configuration generates centrifugal force during rotation, which produces the necessary bearing load to prevent slippage and extend bearing life, while still allowing the bearing diameter to be reduced compared to conventional designs.

The patent changes the physical parameter of center of gravity position from the conventional matched position to an offset position. By adjusting the center of gravity offset distance, the patent optimizes the bearing load to be at least 5% of the dynamic load rating, thereby resolving the contradiction between reduced bearing size and extended bearing life.

The patent optimizes the center of gravity offset distance as a controllable parameter to achieve the minimum bearing load of 5% of dynamic load rating. This parameter optimization allows the bearing to be sufficiently loaded for extended life while minimizing the bearing size increase, balancing reliability improvement with compact design.

The patent applies partial centrifugal force generation by using a moderate center of gravity offset rather than a large offset. This partial action generates just enough bearing load (5% of dynamic load rating) to prevent slippage and extend bearing life, without excessively increasing the bearing size or creating other operational problems.