FR2730014A1 - IMPROVEMENTS INTRODUCED IN CARBURETORS FOR EXPLOSION ENGINES - Google Patents

Abstract

The invention relates to a carburetor. According to the invention, there is established, within the body (1) of the carburetor, a partition with compartments (3) determining two laterally adjacent chambers (4) and (5), one (4), volumetrically predominant and constituting the carburetor bowl, in which the outlets to the burners or the acceleration and idling jets are maintained, and an auxiliary chamber (5), of minimum dimensions, where the fuel outlet to the starting system is established cold instantaneous, of a minimum capacity but sufficient to ensure the adequate supply of this system, the two chambers (4) and (5) being connected by means of a small groove (6) open towards the edge upper part of the partition (3), which constitutes the passage of fuel from the chamber (4) to the chamber (5) and whose bottom determines the maximum level of the latter, which is kept constant until the moment of starting, in to reduce cold start time. The invention applies in particular to internal combustion engines.

Description

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  This invention refers to improvements introduced in the carburetors which provide the fuel - air mixture to the internal combustion engines, improvements which are directed towards a substantial reduction in the cold start time of this type of engines. As is known, the carburetors are structured from a tank, the object of which is to maintain a certain level of fuel in its interior, with the collaboration of a level float acting on a needle valve, and from this tank, through filters to retain possible impurities, the gasoline passes to a series of burners or nozzles that control the amount of gasoline supplied by the carburetor, depending on

  different working regimes of the engine.

  In this aspect of fuel supply, one of the problems with the combustion engines is the cold start. This is why in the carburettors, one burner or jet of acceleration, one of idling and one third for the

cold start.

  However, cold start systems do not offer the immediacy that would be desirable, mainly because the sufficient gasoline does not get there at the right time. This causes excessive use of the starter motor, with consequent wear of the latter, as well as the consumption of electrical energy of the battery, in addition to the psychological effect caused to the driver by the delay when

starting.

  This lack of access to gasoline cold start system is due to the fact that at startup, the level of gasoline in the carburetor tank is located

  substantially below the optimal level.

  The improvements that are provided by this invention have been specifically designed to solve this problem quite satisfactorily by allowing gasoline to arrive instantly at the starting system at

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  cold at the moment when the engine starts; thus the use of this starter motor is minimal and the energy contribution of the battery is reduced to a minimum. For this purpose and in a more concrete way, these improvements consist in establishing, within the carburettor tank, a compartmental partition defining two laterally adjacent chambers, one constituting the tank itself, volumetrically majority, and a small side chamber, constituting an auxiliary chamber, intended specifically and exclusively to supply the cold start system, auxiliary chamber communicating with the main chamber exclusively through a small cut or groove at its input, so that the isolation of this auxiliary chamber determines the existence, in the latter, of a quantity of fuel defined by the bottom of this groove, normally equal to or greater than that which exists in the tank itself, especially greater than that of this tank itself at the time of starting, because this auxiliary chamber is not affected by the Evaporations or losses that exist in the main chamber or the tank

proper.

  The improvements that are proposed by this invention are also applicable to existing carburetors in production with a small modification in the mechanization allowing the direct passage of fuel to

  from the closing valve to the auxiliary chamber.

  In this case, this partition wall is replaced by a small bowl, obtained in any suitable material, such as plastic, which constitutes the auxiliary chamber mentioned above, with its corresponding groove of communication with the main chamber or the bowl itself, this bowl to be anatomically accommodated for a perfect adaptation and

  implantation in the conventional carburetor.

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  In any case, the dimensions of this auxiliary chamber will be such that they will only slightly affect the carburetor tank, so that the tank itself will have a maximum volume, but at the same time with sufficient capacity for get the feed

appropriate when starting.

  The invention will be better understood and other purposes, features, details and advantages thereof

  will become clearer during the description

  explanatory text which will follow with reference to the accompanying schematic drawings given solely by way of example illustrating several embodiments of the invention and in which: - Figure 1 shows a plan view of the body of a carburetor made according to the improvements which are the subject of this invention; - Figure 2 shows a cross section of the body of the previous figure, according to the sectional line A-B of this figure; Fig. 3 shows another cross-sectional detail of the same body, now in accordance with section line C-D of Fig. 1; - Figure 4 shows, finally, a sectional detail, according to a similar sectional plane opposite to that bearing the reference CD in Figure 1, corresponding to the independent bowl which is the practical embodiment of the improvements of this invention , when these are applied to a conventional carburettor already

  in production, or carburettor project.

  There is shown in Figure 1, a certain type of carburetor body 1, and it is obvious that this embodiment is purely exemplary and that the invention is

  applicable to any other type of carburetor, that is

  to say carburetors having any shape and

any capacity.

  Anyway, the body 1 of the carburettor will determine a tank 2 in which there will be a set

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  a conventional level float acting on a needle valve, which is not shown either in the figures, to control the supply of fuel, gasoline in general, and to maintain within the carburettor, the level as close as possible to the theoretical level. Now the improvements of this invention consist in establishing within this vessel a compartmental partition 3 determining, in the tank 2, two chambers, a majority chamber 4, which constitutes the vessel itself, and within which will continue to act the float for the control of the fuel supply valve, and o will be established further the outputs to the burners or nozzles of acceleration and idling and an auxiliary chamber 5, of very small dimensions, in which in turn will be located exclusively the burner or jet

  cold start system power supply.

  These two chambers 4 and 5 will be in communication through a small groove 6 which is near the upper edge of the partition 3, so that when will be reached, in the auxiliary chamber 5, in which is established the fuel inlet 7 , the level defined by the bottom of the groove 6, the excess fuel will pass into the main chamber 4 or the tank itself, until it reaches its maximum level, when it will occur the closure of the valve d supply on the inlet port

fuel to both rooms.

  Thus, after a longer or shorter period of inactivity of the vehicle, situation in which the level in the main chamber or the tank itself 4 will have fallen due to evaporation, loss or any other cause, the level of fuel in the chamber 5 will be maintained virtually intact, and moreover in the case where it is not so, because the fuel inlet 7 is also placed in the auxiliary chamber 5 and because of the small volume of the latter, its filling will occur

  quickly, in a virtually instantaneous manner.

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  In the event that, for any reason, the starting would not occur while the fuel of the auxiliary chamber had been consumed, a portion of the fuel from the main chamber would reach the auxiliary chamber through the groove 6, lowering the fuel. level in the master bedroom. This would cause the float to lower and the fuel valve to open. This would produce an instant fill of the

  auxiliary room through its entrance 7.

  There is another fuel input 8 for the

master bedroom 4.

  As has been said previously, this invention is applicable to future-manufactured carburettors, such as that shown in FIGS. 1 to 3, but it is also applicable to existing carburetors, and in this case, has provided that the partition 3 which has been mentioned is replaced by a small bowl, such as that shown in Figure 4, the "anatomy" or configuration will be the one suitable for its perfect adaptation to the body of the carburetor in the most appropriate position, this bowl also having a groove 6, in which should be its inner wall, for communication with the tank itself. Of course, there is also the possibility that newly designed carburettors use the bowl 8 instead of the

  partition wall 3 mentioned above.

  Although the invention can be applied to conventional carburettors already manufactured, it must not be forgotten that it will be necessary to form the communication hole between the main fuel inlet 7 and the secondary inlet 8, which is why it does not will not be applicable to carburettors already mounted (in stock), but it will, after prior modification, be applicable to those who are

  currently in production.

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Claims (2)

  1. Carburetor for a combustion engine, type o the cold start time is reduced, characterized in that it establishes, in the tank (2) defined by the body (1) of the carburettor, a compartmental partition (3). ) which determines, within this tank (2), two compartments (4) and (5), laterally adjacent, one of them volumetrically majority and determining the tank itself (4), and the other (5) ) of a minimum volume but still sufficient to receive the fuel dose necessary to obtain the instantaneous start, thereby establishing in this small auxiliary chamber (5), the fuel outlet to the instantaneous starter system, in that these two chambers (4) and (5) are in communication through a small groove (6) open towards the upper edge of the compartmental partition (3), the bottom of which determines the level of overflow of a chamber or chamber. other, in that the fuel supply is carried out by to two ducts and simultaneously from the carburettor fuel passage valve to the auxiliary chamber (5) and to the main chamber (4), in that once the fuel level is reached and that the passage valve, opened by the displacement of the float will be closed, a possible start will leave without fuel the auxiliary chamber (5) but because the two chambers (4) and (5) are in communication with the aid of the compartment partition (3), there will be the fuel passage from the main chamber (4) to the auxiliary chamber (5), the descending float and the opening valve while the immediate filling of the   auxiliary chamber through its supply duct.   2. Carburetor for an internal combustion engine according to claim 1, characterized in that the compartment partition (3), within the body (1) of the carburettor, is replaced by a small bowl (9), configured in correspondence with 7 2730014   the body of this carburetor for perfect adaptation to the latter, this bowl o must be its inner wall having the same groove (6) of communication between his   inside and the rest of the carburetor tank.