Fabricating internal combustion engine cylinder heads with close

Details Fabricating internal combustion engine cylinder heads with close Fabricating internal combustion engine cylinder heads with close

1988-12-07

1990-01-30

Cross, E. Rollins

Internal-combustion engines

Valve

Valve head cooperates with manifold

123188S, 123193CH, 291567R, 408 75, 408 80, F01L 308

Patent

active

048966380

ABSTRACT:
A method for fabricating an internal combustion engine cylinder head, comprises the steps: (a) forming a cast cylinder head with a passage having implanted in the walls of such passage a valve stem guide sleeve insert and a valve seat insert, the inserts being formed of fused powder metal and each having an internal cylindrical surface prepared to near net shape no longer requiring macroscale sizing; and (b) microsizing both of the internal cylindrical surfaces by a single pass of a common rotary abrasive tool inflexible along its axis and supported for accurate alignment independent of the guide sleeve. The cylinder head may be first formed with such passage having a recess for a valve seat insert and a guide bore for a guide sleeve; preshaped inserts are then press-fit into such recess and guide bore. Near net shape means an overside tolerance of plus 0.002-0.003 inches; macroscale means measurements in increments or units greater than 0.01 inches.

REFERENCES:
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patent: 4342293 (1982-08-01), Nickerson
patent: 4545706 (1985-10-01), Hiroyasu et al.
patent: 4570585 (1986-02-01), Hayashi

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