Internal-combustion engines – Engine speed regulator – Having plural throttle valve structure
Reexamination Certificate
2003-04-23
2004-08-03
Kwon, John (Department: 3747)
Internal-combustion engines
Engine speed regulator
Having plural throttle valve structure
C123S442000, C123S586000
Reexamination Certificate
active
06769396
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a diaphragm carburetor for an internal combustion engine that operates with scavenging, especially for the two-cycle engine in a manually-guided implement, such as a power chainsaw, a cut-off machine, a trimmer, a brush cutter, or the like.
DE 199 18 719 A1 discloses a diaphragm carburetor, the butterfly valve of which is coupled with the air valve. The butterfly valve can execute an idle path relative to the air valve. The butterfly valve and the air valve can be coupled via a linkage. With this type of coupling, the butterfly valve and the air valve open linearly after passing through the idle path. Another embodiment provides that the butterfly valve and air valve be coupled via levers that have a cam contour. By means of the cam contour, a desired opening characteristic of the air valve is to be achieved as a function of the position of the butterfly valve. However, the manufacture of such a cam contour is complicated. Already slight deviations from the desired dimensions of the cam contour lead to relatively large variations of the opening characteristic.
It is therefore an object of the present invention to provide a diaphragm carburetor of the aforementioned general type that imparts to the internal combustion engine a favorable ratio of the fuel/air mixture to clean air, and that is easy to manufacture.
REFERENCES:
patent: 4254745 (1981-03-01), Noguchi et al.
patent: 4294205 (1981-10-01), Iiyama et al.
patent: 4452218 (1984-06-01), Yokoyama et al.
patent: 4484551 (1984-11-01), Choma et al.
patent: 4567860 (1986-02-01), Sugiyama
patent: 5299548 (1994-04-01), Beall
patent: 6328288 (2001-12-01), Gerhardy
patent: 199 18 719 (2000-10-01), None
Fleig Claus
Geyer Werner
Knödler Bernd
Schlossarczyk Jörg
Andreas Stihl AG & Co. KG
Becker R W
Kwon John
R W Becker & Associates
LandOfFree
Diaphragm carburetor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Diaphragm carburetor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diaphragm carburetor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3323344