Valve stem topographical optimization process

Details Valve stem topographical optimization process Valve stem topographical optimization process

1992-01-06

1993-02-16

Cross, E. Rollins

Internal-combustion engines

Valve

Reciprocating valve

1231889, F01L 320

Patent

active

051861356

ABSTRACT:
Processes are provided that in one embodiment provide scribe or scratch marks (16) in the outer surface of an internal combustion engine valve stem (12) that are oriented at an acute angle (alpha) to the central longitudinal axis ("C") of valve stem (12) to promote stress planes that reduce the amount of stress arising in valve stem (12) from bending and reciprocating tensile forces "F" acting thereupon during operation of the engine. In another embodiment two sets of such scribe or scratch marks (26 and (28) are produced that intersect each other to provide a cross-hatch pattern and in yet another embodiment circumferentially spaced scribe or scratch marks (40) are produced in the outer surface of valve stem (36) that are substanially parallel to axis "C" and effective to reduce surface area engagable with a surrounding surface (60) of an insert (58) through which valve stem recirprocates during operation of the engine and to enable maintenance of an elastohydrodynamic lubrication film therebetween.

REFERENCES:
patent: 2857896 (1957-06-01), Schnepel
patent: 4928645 (1990-05-01), Berneburg
patent: 5076866 (1991-12-01), Koike et al.
patent: 5094200 (1992-03-01), Fontichiaro

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