Cylinder head drain and vent

Abstract

A central direct injection (DI) cylinder head is configured with an intake valvetrain and an exhaust valvetrain separated by an uncovered central DI valley. The uncovered central DI valley limits oil flow from the high side chamber to the low side chamber and PCV transfer. Oil drainage and additional PCV transfer between the intake and exhaust chambers is provided by drain / vent passages integrally cast into the casting of the cylinder head. The drain / vent passages may be of varying configuration, and may be located between an injector port of a first cylinder set and a spark plug port of an adjacent cylinder set, or at either or both ends of the cylinder head. A method is provided to form a casting of the cylinder head as described herein, including casting of a plurality of drain / vent passages between the first chamber and the second chamber of the cylinder head.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 61 / 345,384, filed May 17, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to drainage and ventilation of cylinder heads. Background technique [0004] Central direct injection (DI) engine cylinder heads are typically configured with intake and exhaust valvetrains separated by a central recess that includes the injector and spark plug. Due to the cylinder head configuration required by the central DI, it is very difficult to connect the intake and exhaust chambers to allow drainage and ventilation between these chambers. The cylinder head cover may provide an opening in the central recess such that the central recess is uncovered to provide access to the injectors and spark plugs, which may restrict ventilation and leakage between the intake and exhaust chambers and through the cy...

AI Technical Summary

Problems solved by technology

Due to the cylinder head construction required by the central DI it was very difficult to connect the intake and exhaust chambers to allow drainage and ventilation between these chambers

The cylinder head cover may provide an opening in the central recess such that the central recess is uncovered to provide access to the injectors and spark plugs, which may restrict ventilation and leakage between the intake and exhaust chambers and through the cylinder head cover. Oil

Restricted oil drain between the high and low side chambers can lead to excessive oil accumulation, insufficient oil cooling and increased potential for oil coking

Providing passages for oil circulation, draining, and ventilation between these chambers may require oil management and circulation systems constructed externally to the cylinder head, increasing oil system requirements, engine cost, complexity, and packaging space requirements

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