Evaporable foam pattern for casting an engine block for a two-cy

Details Evaporable foam pattern for casting an engine block for a two-cy Evaporable foam pattern for casting an engine block for a two-cy

1990-10-18

1992-06-09

Lin, Kuang Y.

Metal founding

Means to shape a forming surface

Pattern

164 34, 164 45, B22C 904

Patent

active

051198827

ABSTRACT:
An evaporable foam pattern for casting a metal engine block for a two-cycle engine having a direct charge system. The pattern includes a block pattern section having a head end and a crankcase end and a plurality of cylinders extend between the ends. A transfer passage is associated with each cylinder and one end of each transfer passage communicates with the crank-case end of the block, while the opposite end of the transfer passage communicates with the cylinder adjacent the head end. The block pattern section is provided with a plurality of openings each of which provides communication between a transfer passage and the exterior and the openings are bordered by a generally planar surface. The pattern also includes a cover pattern section enclosing the openings in the first section. The cover pattern section has a peripheral flange disposed in abutting relation with the planar surface of the block pattern section and the cover pattern section includes a plurality of inwardly facing portions, each of which is received within an opening in the block section and defines the outer wall of a transfer passage. The abutting surfaces are joined together by an adhesive.

REFERENCES:
patent: 4632169 (1986-12-01), Osborn et al.
patent: 4640333 (1987-02-01), Martin et al.
patent: 4657063 (1987-04-01), Morris
patent: 4777997 (1988-10-01), Corbett
patent: 4802447 (1989-01-01), Corbett
patent: 4883110 (1989-11-01), Morgan et al.
patent: 4907638 (1990-03-01), Hubbell et al.
patent: 4951733 (1990-08-01), Kusche et al.
"Evaporative Foam Casting Technology II Program", Nov. 1986.

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