Casting of engine blocks
AssigneeGeneral Motors Corporation
InventorsBrian D. Kaminski, Douglas P. Leu, Norman L. Neuenschwander
Life of this patent
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Abstract
An engine block mold package includes a barrel crankcase core having a plurality of barrels on each of which a respective cylinder bore liner is disposed. Each cylinder bore liner includes an inside diameter that is tapered along at least a portion of its length to match a draft angle present on the barrels to permit removal of the barrel crankcase core from a core box in which it is formed.
Claims14
An engine block mold package, comprising a barrel core having a plurality of barrels with each barrel having an outside diametral taper that provides a barrel diameter that decreases in a direction toward a distal end of each barrel, and a cylinder bore liner disposed on a respective one of said barrels, each said bore liner having an inside diametral taper along at least a portion of its length substantially matching the outside diametral taper of said respective one of said barrels on which it is disposed.
In a method of assembling an engine block mold package, the steps of providing a barrel core having a plurality of barrels with each barrel having an outside diametral taper that provides a barrel diameter that decreases toward a distal of each barrel, providing a plurality of cylinder bore liners separate from said barrels with each cylinder bore liner having an inside diametral taper along at least a portion of its length substantially matching said outside diametral taper, and disposing a respective one of the cylinder bore liners on a respective one of said barrels.
A barrel crankcase core having a plurality of barrels on an integral crankcase region, each barrel having a converging outside diametral taper that provides a barrel diameter that decreases in a direction away from said integral crankcase region toward a distal end of each barrel, and a cylinder bore liner disposed on a respective one of said barrels, each said bore liner having an inside diametral taper along at least a portion of its length substantially matching said outside diametral taper of said respective one of said barrels on which it is disposed.
Dependencies are inferred from the claim text.