Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2000-05-04
2001-08-14
Lo, Wellun (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090390
Reexamination Certificate
active
06273040
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to an adjustable overhead rocker cam valve operating device for an internal combustion engine and, in particular, to a device for use with race cars or high-performance automobile engines.
DESCRIPTION OF THE PRIOR ART
Prior valve control systems utilized fixed rocker arms which require considerable movement, or multiple rocker arm elements which are engageable with different cam profiles and means to interconnect the different rocker arm elements. An example is the system described in U.S. Pat. No. 5,623,897 issued Apr. 29, 1997. Other systems utilize a plurality of rocker arms positioned adjacent to one another, and a plurality of valve operating cams. Such a system is described in U.S. Pat. No. 5,979,379 issued Nov. 9, 1999.
SUMMARY OF THE INVENTION
In accordance with the principle of the present invention, there is provided an overhead rocker cam system which is adjustable and minimizes valve train movement. The system provides geometric advantages such that the rocker arm does not move away from the valve stem in an excessive manner. The rocker cam is adjustable so that the farther away the link is moved from the rocker cam, the less extra lift is provided. Thus, the rocker cam and connecting link can be adjusted for more or less power or, with a performance-type automobile, can be adjusted to a performance mode or an economy mode.
REFERENCES:
patent: 4397270 (1983-08-01), Aoyama
patent: 5189998 (1993-03-01), Hara
patent: 5682848 (1997-11-01), Hampton et al.
patent: 5809951 (1998-09-01), Kim
patent: 5979379 (1999-11-01), Sato et al.
patent: 5988125 (1999-11-01), Hara et al.
patent: 6085705 (2000-07-01), Vorih
Fato Gildo E.
Lo Wellun
LandOfFree
Adjustable overhead rocker cam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adjustable overhead rocker cam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adjustable overhead rocker cam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2442086