MXPA01003217A - Carburetor - Google Patents

Abstract

A carburetor (10) for an internal combustion engine including a body (12) having an air inlet (14) and air outlet (16). A throat (18) is disposed in the body (12) between the air inlet (14) and outlet (16). A slide assembly (20) is movably disposed in the body (12) for crosswise movement across the throat (18). The slide assembly (20) includes a stepped portion (38) upstream of the throat (18) and the lower portion of the air inlet (14) is narrowed for concentrating and compressing the air entering the throat (18). A reservoir (24) containing fuel is attached to the body (12). The fuel reservoir (24) includes a fuel outlet (30) located in the throat (18). An adjustable metering rod (26) extends through the slide assembly (20) and throat (18) into the fuel reservoir (24).

Description

CARBURETOR The present request is based on Provisional Application No. 60/103, 459, entitled CARBURETOR CONSTRÜCTION, filed on October 7, 1998 and Interim Application No. 60 / 118,421 entitled FUEL OVERFLO VALVE filed on February 7, 1999.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carburetor for an internal combustion engine, and more particularly to a carburetor having a slide portion that compresses the flow of air entering through the air inlet. and a screw adjustment assembly. 2. Description of the Related Art Carburetors having a metering rod and slide assembly are known. As described in U.S. Patent No. 5, 538, 673, the carburetor adjusting screw devices allow an accurate supply of fuel to adjust the performance of the carburetor. The slide is partially angled on its lower surface. However, the slide is not configured to compress and accelerate properly the air as it passes under the slide. It is also known how to use devices (see U.S. Patent No. 4, 530, 805) or projections (see U.S. Patent No. 4, 459, 243, 4, 464, and 311). 4,465,642) within the venturi tube of a carburetor to vary the flow therethrough. There is a need for such a carburetor that includes a slide portion to increase the velocity of the airflow passing the slide portion to effect complete mixing of the incoming fuel with the air and proper combustion of the fuel-air mixture. .

BRIEF DESCRIPTION OF THE INVENTION An object of the present invention is to effect the complete mixing of the incoming fuel with the air and an efficient combustion of the air-fuel mixture by forcing the incoming air for compression before the displacement under the slide, increasing of this it forms the velocity of the air flow that passes the slide and the fuel entrance to the mouth of the Venturi tube. Another object of the present invention is to concentrate and accelerate the flow of air passing the lower portion of the slide and the fuel inlet to the mouth by narrowing the lower portion of the carburetor air inlet. A further object of the present invention is to maintain a stable atmospheric pressure on the fuel in the flotation cup, thereby generating a uniform fuel flow and efficient mixing of the fuel with the incoming air by providing air inlet openings and an intake of air in the upper portion of the air inlet. The air intake serves to trap the same in a state without turbulence, relatively at rest at the entrance of the inlet openings to maintain a constant pressure on the fuel in the flotation cup.

Another object of the present invention is to provide a uniform surface for air flow in order to reduce the turbulence of the air passing under the slide by forming the lower surface of the slide substantially flush with the front and rear surfaces of the mi. Another object of the invention is to eliminate the excess fuel if the flotation cup is excessively filled or there is an alteration in the vertical position of the flotation cup. A cone-shaped orifice containing a closed cell or sphere of similar material is provided. When the sphere reaches the top of the hole it creates a seal that restricts the escape of fuel from the flotation cup. To achieve these and other objects of the present invention, a carburetor is provided for an internal combustion engine that includes a body having an air inlet end and an air outlet. A throat is placed in the body between the air inlet and the outlet. A slide assembly is movably positioned in the body for transverse movement through the throat. A flotation cup containing the fuel is attached to the body. The flotation cup includes a fuel outlet located in the throat. An adjustable metering rod extends through the slide assembly and throat into the flotation cup. A spring assembly is located within the slide assembly to adjust the position of the slide assembly to control the flow of air and fuel entering the body. Other features and advantages of the present invention will become apparent from the following descriptions of the invention which refer to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front plan view of the carburetor of the present invention in an unoccupied condition. Fig. 2 is a cross-sectional view of the carburetor taken along the line I-I of Fig. 1. Fig. 3 is a view is a cross-sectional view of the slide assembly of the present invention.

FIG. 4 is a front elevational view of the carburetor of the present invention in an unoccupied condition illustrating the flow of air through the air intake in the air inlet. Fig. 5 is a traversal cross section taken along line II-II of Fig. 4. Fig. 6 is a front elevation view of the carburetor of the present invention at 1/4 speed of the fuel shutter. Fig. 7 is a cross-sectional view of the carburetor taken along the line lililí of Fig. 6. Fig. 8 is a front elevational view of the carburetor of the present invention at 1/2 shutter speed made out of fuel. Fig. 9 is a cross-sectional view of the carburetor taken along line IV-IV of the? ig. 8. Fig. 10 is a front plan view of the carburetor of the present invention at 3/4 of the speed of the fuel shutter. Fig. 11 is a cross-sectional view of the carburetor taken along the line V-V of the Fiq. 10 Fig. 12 is a front elevational view of the carburetor of the present invention at full speed of the fuel shutter. Fig. 13 is a cross-sectional side view of the fuel spill valve of the carburetor of the present invention. Fig. 14 is a cross-sectional view of the fuel spill valve in a high fuel level condition. Fig. 15 is a cross-sectional view of the carburetor and the fuel spill valve in a non-vertical position.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES With reference to Figs. 1 and 2, the carburetor of the present invention is shown in a vacuum operating state. The carburetor 1 0 comprises a body 12 having an air inlet end 14 and an air outlet end 16. A throat 18 extends between the inlet 14 and the outlet 16 and provides a Venturi air passage for the air that it enters and leaves the carburetor. In the throat 18 a slide assembly 20 is centrally located. The web assembly 20 moves transversely through the throat 18 within the slide holder 22 of the body 12. The movement of the slide assembly 20 will be described additionally in the present. A float cup or chamber 24 is secured to the body 12 behind the slide assembly 20. The float cup 24 contains a quantity of fuel that is delivered to the throat 18 through a fuel inlet 30 through the movement of a metering rod 26. As shown in Fig. 2 the metering rod 2 6 is adjustable in an adjustable manner and extends downwardly from the slide assembly 20 in a fuel supply line 28. The metering rod 26 has a portion of elongate head 27 which is slidably received within a lower diameter 48 (Fig. 3) of the slider assembly 20. The position of the rod 16 within the slider assembly 20 can be adjusted through known means and will not be described. additional way in the present. The dosing rod head 27 is deflected upwards by the action of a spring 32.

Referring to FIG. 3, the slide assembly 20 will be described in detail. The slide assembly 20 includes a spring retainer portion 34 and a metering rod portion 36 connected thereto. The spring retainer portion 34 is stepped up and designated by the number 38. The stepped portion 38 forces air to enter from the compression inlet 14 before passing under the slide assembly 20, thereby increasing the velocity of the air flow passing the slider and the fuel outlet 29. This is especially effective for the complete mixing of the incoming fuel and air and the efficient combustion of the fuel-air mixture at lower graduations of the fuel. carburetor. The dosing rod portion 36 includes an upper and a lower end 42, 44 respectively. A first diameter 46 is located at the upper end 42 and a second diameter 48 is located at the lower end 44. The metering rod 2 6 extends through an opening 47 at the lower end 44 within the diameter 48. As shown in Fig. 3, the lower end 44 of the slide 20 is flat so that its surface is formed substantially flush with the front and top faces thereof. The end 44 provides a uniform surface for the air flow thereby reducing the turbulence of the air passing under the slide. Referring again to Fig. 17 an air inlet 14 includes a narrower lower portion at 50 which concentrates and accelerates the air flow passing the lower end 44 of the slide 20 and the fuel inlet 20. This concentration and acceleration of the air flow in the lower portion 50 is particularly effective at low carburetor graduations, which also performs a complete mixing of the fuel and air causing an effective combustion of the mech. The slide assembly 20 is driven through suitable means such as a cable (not shown) for moving up and down through the throat 18 which controls the flow of air from the inlet 14 through the lower surface 44 from the slide to exit 16. As shown in Figs. 4 and 5, the body 12 includes an air intake 70 in an upper portion thereof over the air inlet 14. The air intake 70 includes air inlets 72 of the air supply tubes 74. As shown by the arrows, air enters the tubes 74 through the inlets 72 and moves downwardly of the tubes exiting through the tube ends 76 into the flotation cup 24 to pressurize the same. The air inlets 72 and the air intake 70 maintain a stable atmospheric pressure on the fuel in the flotation cup thereby generating uniform fuel flow and efficient mixing of the fuel with the incoming air. The air intake 70 also serves to trap the air in a non-turbulent state, substantially at rest at the entrance of the air inlets 72 in order to maintain a constant pressure on the fuel in the flotation cup 24. When the engine is in idle speed, as shown in Figs. 1 and 2 the lower end 44 of the slide 20 extends almost completely through the throat 1 6 allowing a minimum of air flow through the slide 20 and the fuel inlet 20. Approximately 1/4 of the shutter of fuel as shown in Figs. 6 and 7, the slide 20 has moved up and the air flow through the slide 20 and the fuel inlet 30 has increased. The air stream passing through the venturi passage is intimately connected with the fuel to a mixture having the desired air-fuel ratio. Approximately 1/2 of the fuel shutter, as shown in Figs. 8 and 9, the slide is advanced through the throat 18 and up into the slide holder 22. Similarly, about 3/4 of the fuel shutter as shown in Figs. 10 and 11, the Venturi air passage is almost completely open allowing for increased flow and fuel delivery. In Fig. 12, which illustrates the fuel shutter of the entire engine, the air passage is completely open. With reference to Figs. 13-15 the carburetor of the present invention includes a fuel spill valve. As shown in Fig. 13, the ends 76 of the air supply tubes 74 terminate in conical shaped cavities 80. Placed within each cavity 8Q is a floating sphere 82. The sphere 82 can be a closed cell sphere or be made of a similar material or another suitable one. When the fuel level 25 rises, as shown in Fig. 14, the sphere 82 moves upwardly within the cavity 80 creating a seal that restricts the entry of fuel to the air inlet tube 74. Similarly , when the fuel level 25 recedes, as shown in Fig. 13, the sphere 82 will resume its normal rest position in the largest opening of the cavity 80. To prevent the sphere 82 from falling into the flotation cup 24 a perforated retainer plate or the like is located within the cavity 80. The plate 84 can be a stamped plate or any other mechanically equivalent device. Since the plate 84 is perforated the air entering the tubes 74 can enter the flotation cup 24 to pressurize it. The sphere 82 eliminates fuel spillage if the float cup 24 becomes excessively filled or if an alteration in the vertical position of the water sphere occurs, as shown in Fig. 15.

Although the present invention has been described in connection with particular embodiments thereof, many other variations and modifications and other uses will be apparent to those skilled in the art. It is therefore preferred that the present invention be limited not by the specific description herein, but only by the appended claims.

Claims (17)

REIVIND CATIONS

1. A carburetor for an internal combustion engine comprising: An air inlet end and an air outlet; apart a throat placed in the body between the entrance and exit of air; A slide assembly movably positioned in the body for transverse movement through the throat; A fuel container containing the fuel in communication with the body, the container including a fuel container located in the throat; An adjustable metering bar that extends through the slide assembly and the throat and into the container; and A spring assembly located within the slide assembly to adjust the position of the slide assembly to control the flow of air and fuel entering the body.

2. The carburetor according to claim 1, characterized in that the slide assembly includes a stepped position of the throat to concentrate and compress the air entering the throat.

The carburetor according to claim 2, characterized in that the slide assembly includes a spring retainer portion positioned on the stepped portion.

4. The carburetor according to claim 3, characterized in that the spring assembly is located within the spring retainer portion.

5. The carburetor according to claim 4, characterized in that the slide assembly includes a proportioning rod portion.

6. The carburetor according to claim 5, characterized in that the metering rod portion has a first and a second end.

The carburetor according to claim 6, further comprising a top diameter located at the first end of the metering rod portion and a lower diameter located within the second end of the metering rod portion, wherein the rod portion dosing machine extends within the lower diameter.

The carburetor according to claim 6, characterized in that the second end of the dosing rod portion extends into the throat and is substantially planar to reduce the turbulence of the air passing underneath.

The carburetor according to claim 1, characterized in that the air inlet includes a narrower lower portion for concentrating and accelerating the flow of air passing the lower end of the slider assembly.

10. The carburetor according to claim 1, characterized in that the air inlet includes an air intake in an upper portion thereof which traps the air in a non-turbulent state, relatively at rest.

11. The carburetor according to claim 10, further comprising at least one air supply tube having opposite ends, one end of the air supply tube that is located within the air inlet of the air inlet. air and the other end of the air supply tube that is located inside the air container, so that air enters through the air intake and moves down the air supply tube to maintain the pressure in the air combus tibie container.

12. The carburetor in accordance with the rei indication 11, characterized in that a second air supply tube has one end located inside the air intake inside the air intake and the other end located inside the fuel container, said first and second air supply tubes which are located on opposite sides of the carburetor body.

13. The carburetor according to claim 11, characterized in that the other end of the at least one air supply tube terminates in a cone-shaped cavity that opens outwardly into the fuel container.

14. The carburetor in accordance with the rei indication 13, which further comprises a floating sphere placed within the cone-shaped cavity, so that when raising the level of fuel the flotation sphere is forced into the narrow cavity to close the air supply pipe and prevent fuel from entering the air supply pipe.

15. The carburetor according to claim 14, further comprising a perforated retainer plate located near the wide end of the cavity to prevent the float ball from falling into the fuel container. The carburetor according to claim 1, further comprising at least one air supply tube having one end placed adjacent to the air inlet and the other end located inside the fuel container, that other end which ends in a cone-shaped cavity that opens outwardly inside said container, and a floating sphere placed within the cavity, whereby upon raising the fuel level in the container the floating sphere is forced at the end of the container. Narrow cavity to close the air supply tube and prevent fuel from entering the air supply tube. 17. The carburetor according to claim 1, characterized in that the lower surface of the slide assembly is substantially flush with the front and rear surfaces thereof to provide a uniform bottom surface to reduce the turbulence of the air flow passing through this .