Cylinder head casting apparatus and method

F - Mech Eng,Light,Heat,Weapons – 02 – F

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22/108, 22/145,

F02F 1/24 (2006.01) B22C 9/10 (2006.01) B22C 9/24 (2006.01) B22D 25/02 (2006.01) F02B 3/06 (2006.01) F02B 75/18 (2006.01) F02B 75/20 (2006.01)

Patent

CA 2017499

A one-piece cylinder head casting, including reliably located passageways for fuel-air intake, for exhaust and for coolant, is formed by a plurality of interengaging one-piece core elements including a one-piece coolant jacket core, a one-piece exhaust core and a one-piece fuel-air intake core, all reliably positioned and held together in an integral core assembly. Preferably, a further core element having a plurality of core supporting and positioning surfaces provides surfaces that mate interfacing surfaces of the one- piece water jacket core, one-piece exhaust core and one- piece intake core and support such cores in position with respect to one another, and the intake core may be provided with a plurality of interfacing surfaces to lock the plurality of core elements into a unitary core assembly. Such cylinder head casting may also be provided with integral walls forming a long, open intake manifold cavity in the side of the cylinder head. Castings, including such cylinder heads, may be provided with long, narrow, open cavities, having lengths many times their widths, formed by uniform walls of casting metal, without foreign elements, through the use of a two-piece, long, narrow core element including an inner core element-supporting portion that is adapted to permit the escape to atmosphere of gas generated during casting. Such long, narrow open cavities are formed with casting metal walls that permit their use as hydraulic fluid reservoirs reliably containing pressures in excess of 3,000 psi.

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