Engine with valve seat inserts and method of retaining
Patent 4831976 Issued on May 23, 1989. Estimated Expiration Date: 
August 9, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 9, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1733696 1949614 2017154 2165311 2517114 3028850 3428035 3820522 3868953 Cylinder head for internal combustion engines, especially diesel engines InventorsAssigneeApplicationNo. 07/230689 filed on 08/09/1988US Classes:123/188.8Valve seat relationExaminersPrimary: Wolfe, Willis R.Assistant: Macy, M. Attorney, Agent or FirmInternational ClassesF01L 3/22 (20060101)F01L 3/00 (20060101) AbstractA valve seat insert of relatively hard (e.g. ferrous) material is positively retained in a recess around a gas flow port in the relatively softer (e.g. aluminum) wall of an engine combustion chamber by deforming a portion of the wall material against a chamfer provided at the outer edge of the insert. The deformation may be accomplished by machining or rolling the proud edge of the wall recess against the chamfer. The port flow may be improved by machining a shallow dished area about the valve seat at the end of the insert and the adjacent wall and the machining step may be used to also deform the wall material against the chamfer or it may follow the deforming step. | |
