Performance carburetor

Details Performance carburetor Performance carburetor

1999-09-12

2001-08-14

Chiesa, Richard L. (Department: 1724)

Gas and liquid contact apparatus

Fluid distribution

Valved

C261SDIG003

Reexamination Certificate

active

06273403

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
Combustion engine accessories
2. Description of the Prior Art
Occasionally a descriptive term in this application may be shortened so as to recite only a part rather than the entirety thereof as a matter of convenience or to avoid needless redundancy. In instances in which that is done, applicant intends that the same meaning be afforded each manner of expression. Thus, the term fuel flow interference needle (
31
) might be used in one instance but in another, if meaning is otherwise clear from context, expression might be shortened to interference needle (
31
) or merely needle (
31
). Any of those forms is intended to convey the same meaning. The term attach or fasten or any of their forms when so used means that the juncture is of a more or less permanent nature, such as might be accomplished by nails, screws, welds or adhesives. Thus it is stated herein that the frontal chamber complement (
4
), where threaded bolts are employed for the purpose, is attached to the rear chamber complement (
5
). A connection in which one object is easily removed from another is described by the word emplace, as where it is stated herein that an object comprising operable adjustment means (
300
) employed for needle advancement and retraction is emplaced in the tunnel (
42
) to turn a threaded adjusting block (
46
). Employment of the words connect or join or any of their forms is intended to include the meaning of both in a more general way.
The term rigid emplacement denotes a connection other than by attachment which, nevertheless, permits separation only with great difficulty or torturous manipulation. It is accordingly stated herein that the anchoring of the knurled throttling cable end (
503
) within the cable end trap (
509
) is a connection of rigid emplacement.
The word multiply is not used herein as a verb, as often otherwise employed, but rather, as an adjective. Thus, where it is stated that carburetion is controlled in part by needling fuel jet (
800
) penetration by a multiply beveled fuel flow interference needle (
31
), meaning that more than one beveled area is present thereon (
31
).
The word comprise may be construed in either of two ways herein. A generic term used to describe a given one of a number of specific elements is said to comprise it, thereby characterizing the specific element with equivalency in meaning for the generic term. Thus, throttling cable anchoring means (
502
) may be said to comprise a knurled end (
503
), meaning that in the particular case, the means (
502
) is such an end (
503
). However, the word comprise may also be used to describe a feature which is part of the structure or composition of a given element. Thus, a carburetor chamber (
1
) may be said to comprise D-shaped configuration (
2
), meaning that the structure of the chamber (
1
) is such as to have the D-shape (
2
) as a feature of its structure. The meaning in the respective cases is clear from context, however. Accordingly, modifying words to clarify which of the two uses is the intended one seem unnecessary.
Terms relating to physical orientation such as up, down, higher and lower refer to carburetion assembly positioning in the manner in which it is typically mounted in a vehicle and consistent with the manner the subjects of this application are shown in the drawings. Thus, the throttling gate (
41
) is frequently spoken of as being raised or lowered and portions of the chamber (
1
) are referred to as the top or bottom thereof (
1
).
The terms effectually open and effectually closed are used herein with reference to adjustments in height of the throttling gate (
41
). The gate (
41
) is stated herein to effectually open and effectually close the chamber (
1
). The use of such terminology acknowledges the fact that even when the gate (
41
) is brought to its (
41
) lowest point within the chamber (
1
), a small opening necessary to allow the flow of sufficient air for engine idling remains. Although the chamber's (
1
) closure may not, therefore, be complete, it may correctly be said to be effectually so. Conversely, although the gate (
41
) may have not been brought completely to the top of the chamber (
1
) upon throttling cable (
500
) retraction, maximum airflow may, nevertheless, have been attained. At that height, the gate (
41
) is stated herein to be effectually open.
Although carburetion has been known since the last century, the never ending search for better efficiency and improved performance continues today.
The historical development of the Venturi principle—establishing that air speeds up when passed through a portion of a duct which has been narrowed—has led to the sculpting of carburetion chambers so as to confer upon the walls thereof the convexity which will accommodate the principle. Despite that and other redesign undertakings, however, carburetion problems remain. Despite the expectation that performance should increase proportionately to operable throttle advance, it has been observed that the rate of increase levels off or even drops when engine throttling is taken to the higher range. In stressed circumstances such as mountain driving where the air is thinner, carburetion problems become aggravated. Acquiring a larger carburetor to address them unfortunately results in a tradeoff at mid and lower range carburetion levels.
Typically, carburetors comprise a sliding mechanism—an airflow obstructor (
400
)—controlled operationally by retraction or extension of a throttling cable (
500
). The cable (
500
) is configured with anchoring means (
502
), discussed further ante, so that when retracted, the the airflow obstructor (
400
) is tugged open to allow therethrough the passage of air. The mixture of air and fuel is ducted to the engine's combustion chambers.
To reduce airflow and accordingly, fuel combustion, the sliding obstructor (
400
) is allowed effectually to close off or restrict airflow. That is accomplished by a gate spring (
550
) which upon expansion, forces the obstructor (
400
) across the carburetor chamber. Thus, the obstructor (
400
) is biased closed and continual operator effort or tethering means of some sort is required to keep the chamber open.
When effectually closed, the movable obstructor (
400
) is generally configured to permit the passage of a smaller volume of air, an amount just sufficient to support engine idling.
The fuel enters the chamber through one or more fuel jets. As the air passes through the chamber it creates a partial vacuum—particularly in a sector thereof (
701
) configured with Venturi convexity—which at a given level draws the fuel along with it.
It is generally recognized that carburetors comprise performance characteristics ranging from low level to high level, corresponding with cross sectional airflow access area (
750
) causally associated with throttling cable (
500
) disposition ranging from idling status to full retraction.
An examination of a typical chamber from either of its ends, discloses that as the throttling cable (
500
) is retracted, effectually opening the sliding or otherwise movable obstructor (
400
), the cross sectional carburetor airflow access area (
750
) is enlarged and engine performance is enhanced. Additional throttle retraction increases that area (
750
) even more but once the obstructor (
400
) is effectually opened, being raised to a point beyond half way, the increase in engine performance becomes negligible and fails to correspond proportionately with the increased volume of carbureted air.
This effect is often taken for granted by vehicle operators and considered merely to be a limitation inherent in the engine. A crucial factor, however, lies in the fact that the shape of the chamber itself—more or less symmetrically tubular—presents an airflow access area (
750
) which enlarges only a very small amount as the airflow obstructor (
400
) effectually opens a considerable amount.
One may readily visualize this by observing the curvature or arcuitry of the top of the circle circumferentially describing the area (
7

Affiliated with

Also associated with

Rating

Performance 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 Performance carburetor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Performance carburetor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2476769