Patent Application
20080272505
1. Field of the Invention
The present invention relates to a carburetor, and more especially to a carburetor for locomotives with a cam assembly and a vacuum horsepower adjustment valve, which is more efficient, saves fuel and reduces pollution.
2. Description of the Prior Art
The design of carburetors is important to improving the performance of locomotives. When consumers purchase locomotives, besides the speed of the locomotive, fuel efficiency and environmental protection are important factors which need to be considered. So before locomotives sold out, most of them need to have their idle-speed oil passage adjusted to minimize the amount of gas (such as HC, NOx, CO etc.) for obtaining the optimal fuel saving point, thereby achieving a state in which gas exhaust reach their lowest and fuel use is minimized.
Taiwan Patent No. 398577, published on Jul. 11, 2000, provides an automatically adjustable carburetor which reduces fuel consumption and pollution. The carburetor has an automatically adjustable choke device in an air inlet path. The choke device is disposed in front of a throttle valve with an oil injection needle in the air inlet path. The choke device includes a fixing axle, an air inlet annular base, a pair of clip springs, a choke cone, and a spring. The choke cone controls the air draw into the carburetor, so as to improve the performance of the carburetor and gas exhaust.
However, a main oil path of the above automatically adjustable carburetor which reduces fuel consumption and pollution uses an oiling line to drive an throttle. When the locomotive moves at high speeds, due to the cone design of the oil injection needle, a gap between the oil injection needle and an emulsifying pipe becomes larger following the movement of the oiling line so that the overflowed fuel particles is difficult to atomize and fuel cannot burn sufficiently, thereby causing more pollution. Furthermore, when the choke cone runs under vacuum suction from the engine, the precise location of the choke cone cannot be controlled effectively, thereby the amount of air input cannot be controlled well and the mixture of the fuel and air is unstable.
Hence, the inventors of the present invention believe that the shortcomings described above are able to be improved and suggest the present invention which is of a reasonable design and is an effective improvement based on deep research and thought.
An object of the present invention is to provide a carburetor, which controls a Venturi cone assembly using a cam to changes the design of a main oil passage so that a core can not only choke air, but also blocks fumes from the fuel. The present invention adopts a vacuum horsepower adjustment valve as an assistant oil passage, thereby making the mixture of fuel and air more stable, reducing pollution and improving performance.
To achieve the above-mentioned object, a carburetor in accordance with the present invention is disclosed. The carburetor includes a base, having a center flow path, two ends of which are respectively an air inlet port and an air outlet port a supporting portion is mounted on one side of the air inlet port on the base. The supporting portion and the base form an annular exit for the main oil path therebetween. A Venturi cone assembly is mounted in the center flow path and includes a fixing axle and a cone. The fixing axle is fixed on the supporting portion and the cone movably pivoted on the fixing axle. The carburetor further includes a cam assembly including a cam spindle, a cam and a connecting board. The cam spindle is pivotedly mounted close to a center of the base. The cam and the connecting board are respectively mounted inside and outside the base and connect with the cam spindle. The cam abuts against the Venturi cone assembly. The carburetor further includes a horsepower adjustment assembly, including a fixed shaft for a fan blade, a fan blade, and an oil line rotation wheel. The fixed shaft for a fan blade is pivotedly mounted on the base close to the air outlet port on the same side and the cam assembly. The fan blade and the oil line rotation wheel are respectively mounted inside and outside the base and connect with the fixed shaft for a fan blade. The carburetor further includes a vacuum horsepower adjustment valve, mounted on a top of the base and including a vacuum valve cover and an auxiliary oil needle. A film is placed between the vacuum valve cover and the base and connects with the auxiliary oil needle. The auxiliary oil needle vertically extends through the base and movably extends into the center flow path.
The efficacy of the present invention is as follows: the cam of the present invention controls the shift of the cone of the Venturi cone assembly under vacuum suction from the engine to limit the position, to mix the air and fuel in a proper amount, and burns the entirety of the fuel. Furthermore, the exit for the main oil path is formed in front of the cone and has a fixed size so that the fuel and air are mixed more uniformly and the fuel can burn sufficiently. Additionally, the vacuum horsepower adjustment valve can automatically adjust the fuel supply at varied speeds to provide better horsepower and improve the efficacy of the carburetor.
To further understand feature and technical contents of the present invention, please refer to the following detailed description and drawings related the present invention. However, the drawings are only to be used as references and explanations, not to limit the present invention.
Please refer to
The base 10 has a center flow path 11 through an inside thereof and forms an air inlet port 12 and an air outlet port 13 at opposite ends of the center flow path 11 respectively. A supporting portion 14 is mounted on the base 10 at the side of the air inlet port 11. An annular exit for the main oil path 15 is formed between the supporting portion 14 and the base 10. The base 10 has an oil groove 16, a plurality of emulsifying pipes 17 connecting with the oil groove 16 (please refer to
The Venturi cone assembly 20 is mounted in the center flow path 11 and includes a fixing axle 21, a cone 22, at least one recovery element 23, and a supporting block 24. The fixing axle 21 is fixed on the supporting portion 14. The cone 22 is movably shafted via the fixing axle 21 and forms a Venturi throat passage 111 with the base 10, the supporting portion 14, and the exit for the main oil path 15. The recovery element 23 is a spring mounted inside the cone 22. Two ends of the recovery element 23 abut against with the fixing axle 21 and an inner edge of the cone 22, respectively, so that one end of the cone 22 contacts the supporting portion 14. The supporting block 24 is disposed at the other end of the cone 22 and covers the recovery element 23 inside the cone 22.
The cam assembly 30 includes a cam spindle 31, a cam 32, and a connecting board 33. The cam spindle 31 is pivotedly mounted close to a center of the base 10. The cam 32 and the connecting board 33 are respectively mounted inside and outside the base 10 and both connect with the cam spindle 31, via which the cam 32 and the connecting board 33 can be driven to rotate. The cam 32 collides with the supporting block 24 of the Venturi cone assembly 20. A fine-tuning screw for a cam location 34 extends through a free end of the connecting board 33.
The horsepower adjustment assembly 40 includes a fixed shaft for a fan blade 41, a fan blade 42, an oil line rotation wheel 43, and a locating board 44. The fixed shaft for a fan blade 41 is pivotedly mounted on the base 10 close to the air outlet port 13 and the cam assembly 30. The fan blade 42 and the oil line rotation wheel 43 are respectively mounted inside and outside the base 10 and connect with the fixed shaft for a fan blade 41. The locating board 44 is disposed outside the oil line rotation wheel 43, and connects with the fixed shaft for a fan blade 41. Moreover, the locating board 44 abuts against the fine-tuning screw for the cam location 34.
The vacuum horsepower adjustment valve 50 is mounted on a top of the base 10. The vacuum horsepower adjustment valve 50 is connected with the center flow path 11 by a vacuum through hole 19 in the base 10 so that air can enter the vacuum horsepower adjustment valve 50 through the vacuum through hole 19. The vacuum horsepower adjustment valve 50 includes a vacuum valve cover 51, a film 52, an auxiliary oil needle 53, at least one elastic element 54, and two oil needle fixed pieces 55 and 55′. The film 52 is placed between the vacuum valve cover 51 and the base 10 and connects with the auxiliary oil needle 53. The auxiliary oil needle 53 vertically penetrates through the base 10 and movably extends into the center path 11. The film 52 is held by two oil needle fixed pieces 55 and 55′. The elastic element 54 is a spring, of which two ends respectively abut against the oil needle fixed piece 55 on an under surface of the film 52 and the base 10 One end of the auxiliary oil needle 53 abuts against an adjusting screw 56 on a top of the vacuum valve cover 51.
The air inlet port 12 and the air outlet port 13 of the base 10 of the present invention respectively connecting with an air filter and an engine via Intake manifolds (not shown).
As shown in
The carburetor of the present invention can further connect with an air compensation valve 60 (as shown in
Accordingly, the features and efficacy of the present invention can be summed up as follows:
1. The exit for the main oil path 15 of the present invention is mounted in a gap between the base 10 and the supporting portion 14, so that the overflowed fuel particles doesn't become too large, so the fuel can burn sufficiently and air pollution is reduced.
2. The present invention forms the exit for the main oil path 15 in front of the cone 22, so that besides choke effect, the cone 22 also can block the fuel so that the carburetor has better stability for controlling the fuel and air.
3. The cam 32 of the present invention can effectively control the shift of the cone 22 of the Venturi cone assembly 20 under vacuum suction from the engine, thereby the mixture of the fuel and air is more stable.
4. The vacuum horsepower adjustment valve 50 of the present invention can automatically adjust the fuel supply via vacuum suction from the engine at varied speeds to provide greater horsepower.
What is disclosed above is only the preferred embodiment of the present invention and it is therefore not intended that the present invention be limited to the particular embodiments disclosed. It will be understood by those skilled in the art that various equivalent changes may be made depending on the specification and the drawings of present invention without departing from the scope of the present invention.
