Automatic adjustment carburetor offering fuel economy and low pollution

Information

  • Patent Grant
  • 6264175
  • Patent Number
    6,264,175
  • Date Filed
    Tuesday, November 16, 1999
    25 years ago
  • Date Issued
    Tuesday, July 24, 2001
    23 years ago
  • Inventors
  • Examiners
    • Chiesa; Richard L.
    Agents
    • Rosenberg, Klein & Lee
Abstract
The present invention provides an automatic adjustment carburetor capable of offering fuel economy and low pollution, wherein an automatic adjustment air-blocking device and a gas enrichment device are appended in the intake passage of the carburetor. The air-blocking device is disposed in the intake passage in front of a throttle having a fuel needle. The middle section of the intake passage forms a room having a neck. A venturi tubular front part of expanding arc shape was formed extendedly forward from the neck in the intake passage. A rear part of pot belly shape was formed extendedly backward from the neck in the intake passage. An annular groove at the outer end of the intake passage joins an intake annular seat. A positioning shaft has a plurality of positioning grooves installed near two ends thereof. One positioning groove on each end of the positioning shaft joins a locking spring. The front end of the positioning shaft extends into a central hole of the intake annular seat to join a thread screwed with a nut. An air-blocking cone lags the positioning shaft. The front end of the air-blocking cone sticks to the front locking spring. A spring seat with a diameter larger than that of the locking spring is installed at the rear end of the air-blocking cone to lag one end of a spring. The other end of the spring sticks to a protruding locking edge at the other end of the positioning shaft. If the throttle at the rear part generates a negative pressure, the air-blocking cone will reciprocate back and forth. An exit of an emulsifying tube of the gas enrichment device is installed connectedly to the neck. When the air-blocking cone moves backward, the room of the neck changes, and fuel gas adjusts automatically.
Description




FIELD OF THE INVENTION




The present invention relates to an automatic adjustment carburetor capable of offering fuel economy and low pollution, especially to a device using a set of simple equipment to achieve automatic air-blocking, horsepower adjustment, and gas enrichment. This device is used to match basic structure and functions of the conventional carburetor to acquire the effects of fuel economy and low pollution.




BACKGROUND OF THE INVENTION




In order to meet requirement of environmental protection, the problem of how to reduce discharge of hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxide (NO


x


) of cars and motorcycles is an imperative issue. The conventional carburetor is used to provide proper air/fuel mixing ratios to meet the requirement of the engine at different rotation speeds. While much research has been managed, the problem of how to achieve optimal fuel consumption yet not deteriorate the engine performance is not fully solved. The conventional carburetor generally consumes more fuel to pay for the maintenance of the horsepower. Therefore, more than required fuel is consumed and the exhaust gas results in a more serious problem of air pollution.




Other researchers try to use a cam transmission mechanism for control, but the transmission mechanism is complicated while achieved control is limited.




SUMMARY AND OBJECTIVES OF THE PRESENT INVENTION




Accordingly, the objective of the present invention is to provide an automatic adjustment carburetor capable of offering fuel economy and low pollution, which provides fuel at the most economic condition yet does not influence the horsepower. Total combustion can be achieved to increase efficiency and save fuel, and the exhaust gas generates least pollution under any condition. Moreover, the present invention adopts the principle of negative pressure using a set of simple equipment to achieve the effect of automatic adjustment. Advantages of fuel economy, large horsepower, low pollution, low cost, and high efficiency are all acquired at the same time.




An automatic adjustment air-blocking device and a gas enrichment device are appended in the intake passage of the carburetor according to the present invention. The air-blocking device is disposed in the intake passage in front of a throttle having a fuel needle. The middle section of the intake passage forms a room with a neck. A venturi tubular front part of expanding arc shape was formed extendedly forward from the neck in the intake passage. A rear part of pot belly shape was formed extendedly backward from the neck in the intake passage. An annular groove at the outer end of the intake passage joins an intake annular seat. A positioning shaft has a plurality of positioning grooves installed near two ends thereof. One positioning groove on each end of the positioning shaft joins a locking spring. The front end of the positioning shaft extends into a central hole of the intake annular seat to join a thread screwed with a nut. An air-blocking cone lags the positioning shaft. The front end of the air-blocking cone sticks to the front locking spring. A spring seat with a diameter larger than that of the locking spring is installed at the rear end of the air-blocking cone to lag one end of a spring. The other end of the spring sticks to a protruding locking edge at the other end of the positioning shaft. If the throttle at the rear part generates a negative pressure, the air-blocking cone will reciprocate back and forth. An exit of an emulsifying tube of the gas enrichment device is installed connectedly to the neck. When the air-blocking cone moves backward, the room of the neck changes, and fuel gas adjusts automatically.




The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which:











BRIEF DESCRIPTION OF DRAWING





FIG. 1

is a perspective view of the automatic adjustment carburetor according to an embodiment of the present invention;





FIG. 2

is an exploded perspective view of the automatic adjustment carburetor according to an embodiment of the present invention;





FIG. 3

is an assembly cross-sectional View of the automatic adjustment carburetor according to an embodiment of the present invention;





FIG. 4

is an assembly cross-sectional view of the automatic adjustment carburetor during action according to an embodiment of the present invention.











DETAILED DESCRIPTION OF PREFERRED EMBODIMENT




As shown in

FIGS. 1

to


3


, an automatic adjustment air-blocking device


2


and a gas enrichment device


3


are appended in the intake passage


11


of the main body


1


of the carburetor according to the present invention. The air-blocking device


2


is disposed in the intake passage


11


in front of a throttle


4


having a fuel needle


41


. The middle section of the intake passage


11


forms a room


10


with a neck


12


. A venturi tubular front part


13


of expanding arc shape was formed extendedly forward from the neck in the intake passage


11


. A rear part


14


of pot belly shape was formed extendedly backward from the neck


12


in the intake passage


11


. An annular groove


15


at the outer end of the intake passage


11


of the main body


1


joins an intake annular seat


5


. The intake annular seat is of wheel shape. A rib


52


connects an annular edge


53


to a central hole


51


of the intake annular seat


5


. The aperture between them is a ventilation channel to let air in through a filter. A positioning shaft


8


has a plurality of positioning grooves


81


and


82


is installed near two ends thereof. One positioning groove


81


(or


82


) on each end of the positioning shaft


8


joins a locking spring


87


(or


88


). The front end of the positioning shaft


8


extends into the central hole


51


of the intake annular seat


5


to join a thread


83


screwed with a nut


55


. An air-blocking cone


6


lags the positioning shaft via a through hole


61


. The front end of the air-blocking cone


6


sticks to the front locking spring


87


. A spring seat


62


with a diameter larger than that of the locking spring


88


is installed at the rear end of the air-blocking cone


6


to lag one end


67


of a spring


66


. The other end


68


of the spring


66


sticks to a protruding locking edge


84


at the other end of the positioning shaft


8


. The thinner end of the air-blocking cone


6


adjoins the locking spring


87


, and the thicker end of the air-blocking cone


6


can seal the room


10


formed by the neck


12


. If the throttle


4


at the rear part generates a negative pressure, the air-blocking cone


6


will reciprocate back and forth between the bottom of the spring seat


62


thereof and the rear locking spring


88


. An exit


32


of an emulsifying tube


32


of the gas enrichment device


3


is installed connectedly to the neck


12


. When the air-blocking cone


6


moves backward, the room


10


of the neck


12


emerges, and fuel gas automatically moves out of the exit to replenish. An inner adjusting groove


85


and an outer adjusting groove


86


are respectively installed at the inner and outer ends of the positioning shaft


6


.




The present invention further comprises the main body, a float-feed chamber


19


, a cold starting compensation device


43


, a fuel line


44


, and a throttle


4


of the conventional carburetor to match the air-blocking device


2


. Automatic air-blocking and horsepower adjustment are achieved by using the air-blocking cone


6


. The throttle and fuel circuit of the conventional carburetor are adopted to meet the air/fuel mixing requirement. Also, the art of the cold starting compensation device


43


and the idle fuel circuit


42


can be adopted.




When the fuel line


44


is used for acceleration, the throttle


4


opens, and meanwhile the suction force of the engine increases to suck the air-blocking cone


6


backward and to generate a relative locomotion just as the states shown in

FIGS. 3

to


4


. The room of the intake passage


11


changes to provide more air flow for achieving the best air/fuel mixing ratio. When the suction force of the engine decreases or the horsepower is insufficient, the air-blocking cone


6


will automatically move forward to a predetermined position of the neck


12


to perform the air-blocking function and let the incoming air decrease. The objectives of automatic air-blocking and gas enrichment are then achieved. When the engine restores to its normal condition, the air-blocking cone


6


will restore backward to its original position to provide the best air/fuel mixing ratio, resulting in fuel economy and low pollution.




The effective sliding distance of the air-blocking cone


6


when moving forward and backward according to the vacuum suction force of the engine is controlled by the front and rear locking springs at two ends of the positioning shaft. Because adjustment of the positions of the locking springs changes the sliding distance of two ends, it is set according to the practical requirement of acceleration function of the engine. The positions of the locking springs are generally set in the car factory after checking and the inner adjusting groove is tuned when assembled to set the best position of the positioning shaft. Only the outer adjusting groove of the positioning shaft can be screwably adjusted when used.




Moreover, a fuel circuit of the gas enrichment device


3


is appended at the bottom surface of the neck to match the corresponding position of the air-blocking cone for providing proper functions of gas enrichment and compensation. For instance, when the car accelerates hastily moves uphill, or the function of the engine decreases, the gap in front of the neck a narrows. Meanwhile, when the negative pressure increases, the exit


32


at the neck automatically increases the effusion of the fuel gas, achieving the objective of gas enrichment and horsepower adjustment. Therefore, the curvature of the outer shape of the air-blocking cone is very important. The curvature of the outer shape of the air-blocking cone can be changed to control the air/fuel mixing ratios for different rotation speeds of the engine. The effective curvature of the outer shape of the air-blocking cone can be determined by experiments or actual measurements.




The thinner the air/fuel mixing ratio, the more economic the engine. But too thin an air/fuel ratio will reduce the horsepower and deteriorate the engine function. The present invention uses the negative pressure to automatically move the air-blocking cone of the air-blocking device for controlling the air flow and thus changing the air/fuel ratio. If the fuel gas is insufficient, the gas enrichment device can replenish. Whether the best combustion condition is achieved can be judged according to the exhaust gas at different rotation speeds of the engine and the quantity of consumed fuel under the same load condition. Therefore, the present invention really provides an automatic carburetor capable of offering fuel economy and low pollution.




Although the present invention has been described with reference to the preferred embodiments thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.



Claims
  • 1. An automatic adjustment carburetor capable of offering fuel economy and low pollution, wherein an automatic adjustment air-blocking device and a gas enrichment device are appended in an intake passage of said carburetor, said air-blocking device being disposed in said intake passage in front of a throttle having a fuel needle, said air-blocking device comprising a positioning shaft, an intake annular seat, a pair of locking springs, an air-blocking cone, and a spring, the middle section of said intake passage forming a room having a neck, a venturi tubular front part of expanding arc shape was formed extendedly forward from the neck in the intake passage, a rear part of pot belly shape was formed extendedly backward from the neck in the intake passage, an annular groove at the outer end of said intake passage joining said intake annular seat, said positioning shaft having a plurality of positioning grooves being installed near two ends thereof, one said positioning groove on each end of said positioning shaft joining said locking spring, the front end of said positioning shaft extending into a central hole of said intake annular seat to form a thread screwed with a nut, said air-blocking cone lagging said positioning shaft, the front end of said air-blocking cone sticking to said front locking spring, said spring seat with a diameter larger than that of said locking spring being installed at the rear end of said air-blocking cone to lag one end of said spring, the other end of said spring sticking to a protruding locking edge at the other end of said positioning shaft;whereby if said throttle at the rear part generates a negative pressure, said air-blocking cone will automatically reciprocate back and forth.
  • 2. The automatic adjustment carburetor capable of offering fuel economy and low pollution of claim 1, wherein a gas enrichment device is further installed connectedly to said neck, said gas enrichment device having an emulsifying tube, an exit of said emulsifying tube disposed at said neck, the other end of said emulsifying tube connected to a fuel-supplying device;whereby when said air-blocking cone moves backward, said room of said neck emerges, and fuel gas automatically replenishes.
  • 3. The automatic adjustment carburetor capable of offering fuel economy and low pollution of claim 1, wherein the front end of said positioning shaft extends forward through a screw hole at the central hole of said intake annular seat to screw a nut.
  • 4. The automatic adjustment carburetor capable of offering fuel economy and low pollution of claim 1, wherein each end of said positioning shaft has an adjusting groove.
  • 5. The automatic adjustment carburetor capable of offering fuel economy and low pollution of claim 1, wherein a rib connects an annular edge to the central hole of said intake annular seat, the aperture between them is a ventilation channel.
US Referenced Citations (13)
Number Name Date Kind
1212986 Moore Jan 1917
1726324 Udale Aug 1929
1813866 Royce Jul 1931
1934240 Scott Nov 1933
2016449 Moysard Oct 1935
2167892 Kent et al. Aug 1939
2544111 Schneebeli Mar 1951
4118444 Abbey Oct 1978
4132752 Petermann Jan 1979
4670195 Robson Jun 1987
4955349 Feldinger Sep 1990
5029564 Neutzer Jul 1991
5874028 Liang et al. Feb 1999