Method of making a valve seat

Details Method of making a valve seat Method of making a valve seat

1994-07-20

1997-07-22

Cuda, Irene

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

2988842, 29890124, B23P 1500

Patent

active

056493584

ABSTRACT:
A method for affixing a valve seat insert into a cylinder head recess using pressure or pressure in conjunction with resistance welding. The preferred method avoids the creation of tensile stresses within the valve seat insert during installation into the cylinder head. Further, the method reduces the size of an opening of the valve seat insert during installation. In addition, the application of pressure and the respective shapes of the recess and valve seat insert are such that a moment is not created in the insert which would result in the application of tensile forces on the insert. A lower surface opposite the combustion chamber of the valve seat insert is disposed at an angle to the opening within a range of .+-.15.degree. to a plane which is perpendicular to the axis of the opening. Additionally, the valve seat insert may comprise multiple components which, when resistance welded to the cylinder head, form a plurality of intermetallic layers having gradually varying coefficients of thermal expansion.

REFERENCES:
patent: 1397167 (1921-11-01), Hopper
patent: 1720486 (1929-07-01), Lupert
patent: 1795433 (1931-03-01), Lupert
patent: 5042151 (1991-08-01), Roush
patent: 5353501 (1994-10-01), Naugle

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