Patent Number: 6,308,680

Title: Engine block crankshaft bearings

Abstract: An internal combustion engine comprises an aluminum alloy engine block housing pistons in cylinders and having a lower face including an upper semi-circular bearing surface. A lower bearing support has a lower semi-circular bearing surface to complement the upper semi-circular bearing surface in the engine block to define a crankshaft bore to rotatably support a ferrous crankshaft. The lower bearing support is formed of a single beryllium-aluminum alloy having a coefficient of thermal expansion comparable to the ferrous crankshaft to promote a consistent clearance between the lower bearing support and the crankshaft. Such a beryllium-aluminum alloy may be comprised of approximately 60-65% by weight beryllium and the balance is aluminum.

Inventors: Prior; Gregory Paul (Birmingham, MI)

Assignee: General Motors Corporation

International Classification: F02F 7/00 (20060101); F02B 75/18 (20060101); F02B 75/00 (20060101); F02F 007/00 ()

Expiration Date: 10/30/2018