Four-cycle internal combustion engine and vehicle

Details Four-cycle internal combustion engine and vehicle Four-cycle internal combustion engine and vehicle

2007-07-03

2009-02-03

Kamen, Noah (Department: 3741)

Internal-combustion engines

Valve

Guide, lubricant, or coolant

C123S188120, C123S188170

Reexamination Certificate

active

07484492

ABSTRACT:
A four-cycle internal combustion engine with a valve system having improved durability in the case of high revolution speed. The engine includes a cylinder head having a port, and a valve having a stem part continuous with a fillet part for opening or closing the port. A valve spring including inner and outer springs urges the valve in a direction to close the port. A valve guide holds the stem part slidably. A tubular spring guide supports an outer periphery part of an outer spring to prevent lateral deformation of the spring. A top end of the spring guide is positioned above a top end of a valve guide.

REFERENCES:
patent: 1191658 (1916-07-01), Brown
patent: 2005089 (1935-06-01), Krebs
patent: 4470383 (1984-09-01), DeBolt
patent: 59-173510 (1984-10-01), None
patent: 03-087905 (1991-04-01), None
patent: 4-134109 (1992-05-01), None

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