POWDER METAL VALVE SEAT INSERT

摘要

PURPOSE: A powder metal valve seat insert is provided to secure a new powder metal engine component for an internal combustion engine and to secure the new powder metal valve seat insert which is suited for use in a wide variety of internal combustion engine applications. CONSTITUTION: A valve assembly includes plural valves(12) each reciprocatingly received within the internal bore of a valve shaft guide(14). The valve shaft guide is essentially a tubular structure which is inserted into a cylinder head(24). A valve includes a valve seat face(16) interposed between the valve head and a fillet(28) of the valve. A valve shaft(30) is located normally upwardly of a neck and usually is received within valve shaft guide. A valve seat insert(18) is normally mounted within the cylinder head of the engine. The valve seat insert is substantially annular in shape with a cross-section, and cooperatively receives the valve seat face for sealing engagement therewith. A powder metal engine component is particularly suited for use as the valve seat insert in both light and heavy duty internal combustion engine applications. The powder metal engine component contains an intermetallic phase such as a Laves phase for both the cobalt or iron based alloy.