Patent ID: 8672654

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 driving one of the scroll compressor bodies to facilitate relative movement for the compression of fluid; and a counterweight mounted to the shaft, the counterweight having a first shaft contact surface defined about a first axis coacting with the shaft, and a second shaft contact surface defined about a second axis different than the first axis coacting with the shaft; wherein the counterweight further includes an opening with an at least partial counterbore, which includes one of the first and second shaft contact surfaces, and which operates to locate the counterweight at a predetermined angular location about a circumference of the shaft; wherein one of the first and second shaft contact surfaces locates the counterweight at a predetermined angular position relative to the shaft, and wherein the other of the first and second shaft contact surfaces forms an interference fit securing the counterweight to the shaft; and wherein the counterweight further includes a collar portion, and a weighted portion providing an offset center of mass, wherein the collar portion includes the opening and the at least partial counter bore for providing the first and second contact surfaces.