CN1161409A

CN1161409A - Improvements in motorcycle carburettors

Info

Publication number: CN1161409A
Application number: CN 96123381
Authority: CN
Inventors: 塞吉·卡尔佐拉雷
Original assignee: Magneti Marelli Iberica SA
Current assignee: Marelli Espana SA
Priority date: 1995-11-24
Filing date: 1996-11-22
Publication date: 1997-10-08

Abstract

The present invention relates to a fuel chamber ventilation system. A conventional ventilation pipe includes a second sector (7) behind and perpendicular to a first rising sector (1') and running axially to the inlet tube (8), and pointing to an inlet tube port (10) connecting to the air cleaner in order to the ventilation in the fuel chamber can be executed by carburettor air cleaner to make the fuel chamber acquire clean air at any moment; the practical air flow that flows the air cleaner will generate a pressure drop in the aperture (9) of a ventilation pipe (7), the pressure drop is transmitted into the fuel chamber and is cooperated with the fuel supply pressure drop generated by a venturi effect.

Description

The improvement of motorcycle carburetor

The present invention relates to the improvement of motorcycle carburetor, act on the oil pocket ventilation system especially, that is: reduce the pollutant in the whole operating range of motor on the one hand to reach three kinds of necessary effects; Next increases engine power; After air-strainer is dirty, still can keep an independently correct fuel oil proportioning at last.

Except that a series of needn't parts described here, motorcycle carburetor also has a supplying fuel chamber, the Venturi effect that air enters generation with fuel oil from this chamber sucking-off.

Because each fuel amount of distributing is constantly fallen decision by the trunnion place pressure of relative fuel chamber internal reference pressure,, and increase pollution level so after air-strainer was dirty, it is denseer that oil-gas proportions of ingredients can change and become.

The purpose of this invention is to provide a kind of improvement project addressing the above problem, also bring other benefit simultaneously,, specifically as mentioned above, that is: lower level of pollution; An independent operating still can keeping when phenomenal growth of engine power aspect and air-strainer become stolen goods.

Say that more specifically for reaching above purpose, this improvement project comprises arranges this ventilation duct, its free end is fixed in the air intake duct, so that this fuel chamber communicates by carburetor air cleaner and atmosphere.

According to another characteristics of the present invention, the outlet of this ventilation duct is arranged near the air-strainer place, so during the Carburetor proper functioning, the air stream that flows through suction tude produces the pressure that a size can change and falls in ventilation duct, this pressure falls by this ventilation duct and passes in the fuel chamber.The air stream (being engine output) that depends in the suction tude falls in the pressure in emulsion tube outlet port, and this pressure fall with fuel chamber in the pressure that produces fall and match, thereby improved supplying fuel, improved the Carburetor working condition, promptly increase power, reduce pollutant.

In order to provide a comparatively complete description, and help these invention characteristics are carried out complete understanding, with a cover figure, these figure are schematically purely behind the specification, are not fully detailed, wherein:

Fig. 1 is the side view of traditional Carburetor matrix;

Fig. 2 is the side view of Carburetor matrix of the present invention;

Fig. 3 is the worm's eye view that is applicable to Fig. 1 and Fig. 2 embodiment;

Fig. 4 is an engine power plotted curve of adorning traditional Carburetor and Carburetor of the present invention respectively;

Fig. 5 is that the same motor of Fig. 4 is adorned the motor dusty gas generation plotted curve of drawing behind traditional Carburetor and the Carburetor of the present invention respectively.

As mentioned before, Fig. 1 shows traditional Carburetor matrix, there is a ventilation duct 1 as we can see from the figure, this ventilation duct is fixed in the Carburetor matrix 2, and communicate with the carburetor fuel chamber, this chamber is not shown in the figures, be to be fixed on hermetically on the base 3 of matrix 2 in the reality, for make this chamber forever and atmosphere communicate, pipe 1 stretches in the fuel chamber by hole 4, and have a part vertically upward, pipe 1 two elbows to be arranged above matrix so that its tail end can lead to atmosphere in the patchhole 6 with label 1 mark, be to enter in the chamber to the bottom in order to reduce dust as far as possible.

In Fig. 2, can be clear that improvement of the present invention, comprise and revise the ventilation duct path, new ventilation duct 1, part vertically upward still by hole 4 beginnings that feed fuel chamber, there is an elbow bend at the matrix middle part subsequently, this elbow has been determined the end portion 7 of a vertical preceding part, and under any circumstance all in the suction tude axial range.

And, as shown in Figure 2, the free end 9 of ventilation duct 1 ' is in the air inlet mouth of pipe 10 flush position, suction tude connects traditional air-strainer, this just makes under the normal condition, suck air when flowing through carburetion organ pipe 8, produce a pressure and fall the hole 9 of ventilation duct 1 '-7 near, this pressure falls subsequently that another pressure of formation falls in actual fuel chamber.So, as mentioned above,, make to fall and match that the working condition of Carburetor has obtained very big improvement by the fuel oil of Venturi effect sucking-off and fuel chamber internal pressure by the Carburetor ventilation duct.

Specifically, the curve among Fig. 4 is a power curve, and this curve is according to a two-stroke 50cm ³The output power of motor is drawn, and what wherein indicate the black square is the curve of adorning the motor of traditional Carburetor.What indicate white square is the curve of the motor of dress Carburetor of the present invention, and this Carburetor has improved ventilation system in the chamber.

The same mark of Fig. 5 and Fig. 4, this figure have shown that CO produces curve, and these two curves are that same motor is made according to friction speed when using tradition ventilation pipe and ventilation duct of the present invention respectively in the chamber.

Fig. 5 and curve shown in Figure 4 itself have shown the effect of the present invention aspect power and pollutant, need be pointed out that further that this characteristic still can keep after air-strainer is dirty, because native system can detect this variation.

Claims

1. the improvement of motorcycle carburetor, these improved actions are in the fuel chamber ventilation system, it is characterized in that: a stomidium (4) of ventilation duct (1 ') places in this carburetor fuel chamber, another hole of ventilation duct (9) places in the carburetor air pipe (8), so the ventilation in the fuel chamber needs to be undertaken by carburetor air cleaner.

2. the improvement of motorcycle carburetor as claimed in claim 1 is characterized in that: this ventilation duct first is vertical with it part (7) to top (1 ') afterwards, and partly the suction tude (8) in (7) and the Carburetor matrix (2) is coaxial; The outlet of this ventilation duct (9) is positioned at the matrix outlet (10) that connects air-strainer and locates, and it is relative with inner chamber, so, air inlet can produce a pressure during by this air-strainer and fall in ventilation duct (1 '-7), this pressure falls through ventilation duct and passes to actual fuel delivery chamber, acts on or cooperates actual airflow to be fallen by the pressure that Venturi effect produces when fuel delivery.