DE1928532A1 - Carburettors for internal combustion engines - Google Patents

Description

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3152-69

SOCIETE INDUSTRIELLE DS BREVETS ET D «ETUDES S.I.B.E,

Carburettors for internal combustion engines «

The invention relates to the carburetor

for internal combustion engines, which operated except one in a S _a ugleitung ago by the driver. Main throttle body opening main injection circuit have a slow-speed circuit, which opens into this line through a slow-speed opening that is always behind the main throttle element and through at least one transition opening which is in such a position that it passes from the upstream side of the throttle element to the downstream side of the same, if this is slightly adjusted from its position of the smallest opening.

The regulations pertaining to atmospheric pollution write for these carburetors

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Extremely precise settings for the content of the gear on the one hand for the actual slow run (in the case of multiple passages, the transition opening or the transition openings in front of the throttle element, which is in its smallest opening position, and on the other hand for "accelerated slow running" (in which the transition opening or at least one transition opening is open the downward flow of the stream ₍ ; endö side of the somewhat open throttle organ has passed). As is well known, it is often expedient to open the throttle organ a little in Vor.ar.i '; sair.uni-en dun and up to a certain intermediate £ 3 to bring division for accelerated slow running, in v / hich the long run-up circuit of the carburetor, an air-Brennstoffgerniseh supplies, einrestellt v ψ ground nuts / desraen Volur.en and Zusammensetzung- carefully.

Furthermore it is known that the cessation of the actual Langsar.lauf and that of the accelerated Lar.rsarr. running mutually influencing each other ₈ ie »every change in one results in a change in the other. The adjustments of these carburettors in the workshop are tedious, difficult and expensive.

The aim of the invention is to provide such carburetors with devices which are necessary for the adjustment reduce time required and have a simple, inexpensive structure.

For this purpose, the term according to the invention

gas is characterized in that not only the transition opening or the transition openings are arranged in the suction line in such a way that they pass from the side of the main throttle element 3 lying upstream to the downstream side of the main throttle element 3 . this is adjusted from its position of the smallest opening, but also an auxiliary opening, which is at the end of an auxiliary circuit, which is fed with air mixed with fuel, if necessary, and has devices for local regulation of its cross-section and thus the content of the air-fuel mixture which is fed to the engine when the throttle element is opened slightly.

The invention is described below under

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- 3 - 3152-69 Reference to the drawing explained by way of example.

Figs. 1 and 2 show in a perpendicular Schematic section of two Yerrasers according to the invention.

The following is the application of the invention to a carburetor for an internal combustion engine for Motor vehicles described.

The whole carburetor is on any

suitably designed and contains a main injection circuit, not shown, v / which in a Saugleitunfr 1 in front of a generally by one of an Axis 3 .ge-

iriUnaet

carried 'rotary flap formed Kauptdrosselorgan 2 / a Slow running circuit, which is constantly in line 1 through a Slow start-up opening 4 located behind the throttle element 2

and opens through at least one transition opening 5, which has such a position that it moves from the upstream side of the throttle organ ^ to the downstream side The lying side of the same passes over when Jas's throttle organ is somewhat different from the one shown in full drawn out in the drawing Position of the smallest opening up to the accelerated position shown in phantom in FIG Is adjusted slowly. '

The line 1 has an air inlet 6, which is generally provided with an air filter, and an air funnel 7, in the place of which the main injection circuit opens. The low-speed circuit contains a channel 8 on which openings 4 and 5 are arranged and which is connected upstream with the atmosphere or the air inlet 6 and with a fuel source (not shown) for forming a mixture of air and fuel. The slow flow opening 4 is provided with regulating devices, e.g. a screw 9 that tapers into a cone and is held in place by a spring 10. If there are several openings 5, they are graduated so that they move one after the other to the downstream one depending on the opening of the throttle organ 2 Skip side of the same.

In -actual slow running can be done by means of

the screw 9 adjusts the flow rate of the mixture which are sucked into the line 1 through the opening 4

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which is then alone on the downstream lying Side of the throttle device 2 (fully extended in the drawing Position). If now the throttle member 2 is brought into the intermediate position shown in phantom in Fig. 1 which generally corresponds to cfcn slowdowns, it must again be possible to adjust the mixture, which enters the line 1 simultaneously through the opening 4 and the opening 5. or those openings 5, v / elche now behind the throttle body 2 are, we puffed d. The opening or the openings 5 can now be difficult / help from just as many the screw 9 corresponding screws can be regulated. Any change in the cross section of the opening or one each opening 5 for the regulation of the accelerated slow speed would namely change the flow rate of the channel 8 in the actual slow speed, which then air from the line 1 through the opening 5 receives. Conversely, any change in the cross section of the opening 4 changes that of the motor the openings 4 and 5 during accelerated slow running total mixture fed.

To remedy these disadvantages,

according to the invention in the line 1 not only the opening or the Openings 5 are provided so that they move from the upstream side of the main throttle element 2 to the downstream side pass over the lying side of the same when the throttle member is adjusted from its position of the smallest opening is, but also an auxiliary opening 11, which forms the end of an auxiliary circuit, which, if necessary, with fuel mixed air is fed and has facilities for local regulation of its cross section.

In the embodiment of FIG

the auxiliary circle formed by a channel 12, wäjcher with de-r Atmosphere is connected either directly or via an opening 13, which into the line 1 constantly upstream of the throttle member 2 (either, as shown, behind the air funnel 7, or in front of the same) opens, wherein the devices for local regulation of its cross section are formed by a screw 14.

The device shown in FIG. 1 is operated in the manner indicated above by means of the screw 9

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set for the actual slow speed, since the Channel 12 has no effect as its openings. 11 and 13 are both located in front of the throttle element 2. if now the throttle device is brought / is in the position shown in dash-dotted lines for accelerated slow speed, the amount of air can be increased or increased by means of the screw 14 which enters through the opening 13 are reduced and into line 1 again through the now behind the Throttle member 2 lying opening 11 arrives. This allows for little enrichment or depletion of the engine supplied mixture in order to reduce the flow rate irregularities in a series of carburetors of the same type of the opening 5 to take into account which either from their own machining or from a slight difference the position opposite the edge of the throttle member 2 originate. If a mouth 5 with a little too big Cross-section is provided, the mixture can be depleted in that the air flowing through the channel 12 determining screw 14 is loosened.

As you can see, each is influenced by

the screw 14 made change in the salary for the accelerated slow speed the mixture supply for the actual slow speed in no way because of the screw 9 no further adjustments are made and no part of the channel 8 is changed o

In the embodiment of FIG

to the channel 12 between the passage set by the screw 14 and its downstream Opening 11 an additional channel 15 for feeding with / a Air-fuel mixture connected, its cross-section is locally adjustable by a screw 16. The channel 15 is through a calibrated opening 17 with the atmosphere connected, preferably via the air inlet 6, and through a calibrated opening 18 and a channel 19 with the fuel source "

In the formation of the Pig · 2 can

not only, as in the above case, the amount of air is influenced by means of the screw 14, but also the amount of the air-fuel _{mixture by means of the screw 16, see above}

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that the engine is in the accelerated position Lan,?: Hall to the supplied equipment within wider limits, can be enriched or impoverished than in the previous embodiment. The setting of the accelerated Slow speed affects just as little as in the case of the Pig. 1 the actual slowdown.

Regardless of the selected execution

The invention thus provides simple means for approximation form Adjustment of the different low speed conditions of the 3 Mocors, without wasting time.

The invention can of course be modified

will. In particular, the control means according to the invention combined with a low-speed circuit, which P is different from the one shown in the drawing, especially with a Langsadaufkrei3 in the German Patent application P 15 76 618.4 of September 26, 1967 described Art.

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Claims (2)

- 7 - 3152 - 69 Claims ( 1.) Carburetor for internal combustion engines, which auaser a 3Sn ^ _ej ^ ie suction pipe in front of a; The main throttle body, which can be actuated by the driver, has a low-speed circuit, which opens into the suction line through a slow-speed opening that is always behind the main throttle element and through at least one transition opening which is in such a position that it / from the upstream side of the throttle element passes to the downstream side of the same when the throttle element is adjusted slightly from its position of the smallest opening, characterized in that in the suction line (1) not only the transition opening or the transition openings (5) are provided so that they are from the upstream lying side of the main throttle element (2) go over to the downstream side of the same when the throttle element is moved from its position of the smallest opening, but arch an auxiliary opening (11), which is at the end of an auxiliary circuit, which may be mixed with fuel Air stored is and has facilities for the local regulation of its cross-section and thus the content of the air-fuel mixture which is fed to the engine when the throttle element (2) is opened slightly. 2.) Carburetor according to claim 1, characterized characterized in that the auxiliary circuit has an auxiliary channel (12) has, which is connected to the atmosphere either directly or via an opening (13) which into the Suction line (1) opens constantly in front of the main throttle element (2). 3 «) carburetor according to claim 2, characterized characterized in that the auxiliary circuit by the combination of devices (14) for regulating its cross-section provided auxiliary channel (12) with a mixing channel (15) for Production of an air-fuel mixture, which in turn is equipped with devices (16) for regulating its cross-section is provided, is formed. 0098 10/1196 BATH ORIGINAL Blank page