Patent ID: 9114489
Filing Date: 2015-08-25
Classification: B23P,F02F,Y10T

Abstract:
1. A method of forming a cylinder head for a multi-cylinder engine and adjusting capacities of combustion chambers of the multi-cylinder engine having the cylinder head, the cylinder head including recessed parts that partially form the combustion chambers, which are formed as pent-roof combustion chambers having an intake port, an intake port side inclined surface, an exhaust port, an exhaust port side inclined surface, and a mating surface for mating with a cylinder block, the method comprising: casting a cylinder head material having flat reference surfaces on top of the recessed parts of the cylinder head at a boundary between the intake port side inclined surface and the exhaust port side inclined surface; machining the cylinder head material to form the mating surface; after the machining of the cylinder head material to form the mating surface, measuring distances in a height direction from the mating surface to the reference surfaces in preparation for adjusting machining margins up to a boundary with the mating surface; adjusting machining margins of machining portions of the reference surfaces of the recessed parts based on the measured height direction distances after the machining of the cylinder head material to form the mating surface, independently of the machining of the cylinder head material to form the mating surface; and wherein the step of adjusting the machining margins includes machining an arc-shaped portion of the recessed part encircling the intake port and the exhaust port based on the measured height direction distance, as far as the boundary with the mating surface, the boundary with the mating surface being adjacent to an outer edge of the recessed part that at least partially encircles the intake port, exhaust port, reference surface, and the recessed part, the arc-shaped portion serving as the machining portions, the machining portions being portions of the reference surfaces to be machined during the adjusting step.