James B Lenz

US Patent:

20110076169, Mar 31, 2011

Filed:

Sep 24, 2010

Appl. No.:

12/889508

Inventors:

Donald L. Coffey - Ann Arbor MI, US
James R. Lenz - Canton MI, US

Assignee:

TECUMSEH PRODUCTS COMPANY - Ann Arbor MI

International Classification:

F04B 35/04

US Classification:

4174101

Abstract:

The eccentric on the crankshaft of a rotary compressor, as well as the roller that surrounds the crankshaft, is replaced by an elliptical cam that acts as a double eccentric. In this manner, the elliptical cam provides for proper balancing of the crankshaft and other components of the compressor, while eliminating the need to use counterweights. Specifically, the elliptical cam is symmetrical, resulting in equal forces acting on opposing sides of the elliptical cam. This allows the elliptical cam to maintain its balance throughout its rotation, even when operating at a high rate of revolution.