Patent ID: 7390179

Claim:
A balancing system for a scroll machine comprising: a shell; a first scroll member disposed within said shell, said first scroll member having a first end plate and a first spiral wrap projecting outwardly from said first end cap; a second scroll member disposed within said shell, said second scroll member having a second end plate and a second spiral wrap projecting outwardly from said second end cap, said second scroll wrap being intermeshed with said first scroll wrap; a drive member for causing said scroll members to orbit relative to one another whereby said spiral wraps will create pockets of progressively changing volume between a suction pressure zone and a discharge pressure zone; and a counterweight associated with said drive member, said counterweight having a main body defining a recess, said recess being selected to optimize the total mass of said counterweight, a pair of flanges extending from opposite sides of said main body, each of said flanges defining a hole for attaching said counterweight to said drive member.