Patent ID: 7967581

Claim:
A scroll compressor for compressing fluid, comprising, scroll compressor bodies having respective bases and respective scroll ribs that project from the respective bases and which mutually engage; a drive unit providing a rotational output on a shaft, the shaft operatively engaging and driving one of the scroll compressor bodies to facilitate relative movement for the compression of fluid, wherein the shaft integrally forms a drive bush that directly engages the one of the scroll compressor bodies; and a counterweight mounted to the shaft and located on the drive bush, the counterweight having: (a) a first shaft contact surface defined about a first axis coacting with the shaft; and (b) a second shaft contact surface defined about a second axis different than the first axis coacting with the shaft; wherein one of said contact surfaces locates the counterweight at a predetermined angular position relative to the shaft, and wherein the other of said contact surfaces forms an interference fit securing the counterweight to the shaft; and wherein the contact surface for location is formed onto two angularly spaced tabs, each spaced tab defining a partial cylindrical wall segment engaging the shaft to locate the counterweight upon the shaft.