B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/144
B22C 7/02 (2006.01) B22C 9/04 (2006.01) F02B 75/02 (2006.01)
Patent
CA 1333654
An evaporable foam pattern to be used in casting a multi-cylinder in-line two-cycle engine block. The assembled pattern, which is substantially identical in shape to the cast metal block, includes a plurality of in-line cylinders each having an end open to the crankcase end of the pattern. Each cylinder includes an exhaust passage that communicates with an exhaust manifold that extends to the exterior of the pattern and each cylinder has at least one longitudin- ally extending transfer passage. The assembled pattern also includes cooling passages that surround each cylinder, as well as surrounding the exhaust manifold passage. The foam pattern is composed of a plurality of separate foam sections joined together by an adhes- ive along planar interfaces. A first of the sections extends from the crankcase end of the pattern to the lower end of the transfer passages, and a second section extends from the lower end of the transfer passages to a location intersecting the exhaust passages of the cylinders. A third section extends from the exhaust passages to the cylinder heads. In addition, a fourth pattern section encloses the water passages at the head end of the block, while a fifth section encloses the water passage that borders the exhaust manifold.
606967
Habeck Steven W.
Kusche David W.
Stiller Gordon L.
Brunswick Corporation
Mitchell Richard J.
LandOfFree
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