Cylinder head assembly having cooled valve insert

摘要

An cylinder head assembly is disclosed. The cylinder head assembly may include a cylinder head having a stepped bore associated with a valve opening. The cylinder head assembly may also include an insert configured to engage the stepped bore, and a cooling passage at least partially formed by the insert and the stepped bore.

主权项

1. A cylinder head assembly for an engine, comprising:
a cylinder head having a plurality of stepped bores associated with a plurality of valve openings; a plurality of inserts configured to engage the plurality of stepped bores; a plurality of cooling passages at least partially formed by the plurality of inserts and the plurality of stepped bores; at least one inlet passage disposed in the cylinder head and configured to:
direct coolant towards the plurality of cooling passages, anddirect coolant from the plurality of cooling passages in a direction away from a cooling passage at least partially surrounding a fuel injector opening at the center of the cylinder head; and at least one outlet passage disposed in the cylinder head at a location in between an adjacent pair of the plurality of valve openings away from a center of the cylinder head and configured to direct coolant away from the plurality of cooling passages, wherein:
each of the plurality of inserts includes a first pre-machined recess forming a first side of a corresponding cooling passage; andeach of the plurality of stepped bores includes a second pre-machined recess forming a second side of a corresponding cooling passage.