DE1249589B - Carburettor with starting device with eccentrically mounted choke - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE Int. Cl .:

F 02m

EDITORIAL

JQ, German class: '

File number: S 80233 I a / 46 c2
Filing date: July 3, 1962
Opened on: September 7, 1967

The invention relates to a carburetor for internal combustion engines with a starting device with eccentric stored choke.

There are already known carburetors for internal combustion engines in which in the air duct upstream from Spray nozzle system an eccentrically mounted throttle is arranged, which via a linkage of a first thermostatic element as a function of the operating temperature of the internal combustion engine is actuated against the intake air flow and when it falls below a predetermined value Temperature is controlled in the closed position. It is also known in such carburetors, a To equip the carburetor with a second thermostatic element, which depends on the operating temperature the internal combustion engine limits the closed position of the main throttle via a cam.

A disadvantage of this known device is that the main throttle valve remains in a temperature range from very low temperatures to moderate temperature of, for example '35 ⁰ C in a constant opening position, and that this open position is only changed along with a change in the opening of the choke valve. It follows from this that the main throttle valve can still be opened so wide when starting up that the engine speed is very high.

The present invention now aims to design the carburetor so that the opening of the main throttle member is reduced quickly as soon as the engine has started, and in particular the To regulate the minimum opening of the main throttle valve also for the range of lower temperatures, in which the throttle valve remains immovable in the closed position.

These disadvantages are in a carburetor for internal combustion engines with an eccentrically mounted throttle that is arranged in the air duct upstream of the spray nozzle system and is controlled by a first thermostatic member via a linkage, depending on the operating temperature, against the intake air flow when the temperature falls below a specified temperature in the closed position, and a second thermostatic member7 ~ 3äs m "Dependency of the operating temperature of the internal combustion engine over ^ ra__NQ ^ ejLjtte_ ^ c ^ Lassenjtelhmg_d ^ _Hau; Btdrossel limited according to the invention thereby ~ eliminated, ~ ciäB ~ the first thermostatic member also via a stop on the cam in a temperature range independent of the effective range of the second thermostatic member acts and that this carburetor with starting device with eccentric
stored choke

Applicant:

Societe Industrielle de Brevets et d'fitudes

S. I. B. E., Neuilly-sur-Seine, Seine (France)

Representative:

Dr. F. Zumstein, Dr. E. Assmann

and Dr. R. Koenigsberger, patent attorneys,

Munich 2, Bräuhausstr. 4th

Named as inventor:

Andre Louis Mennesson, Neuilly-sur-Seine, Seine (France)

Claimed priority:

France of July 17, 1961 (868 125)

second thermostatic element is ineffective when the internal combustion engine is running.

Such a carburetor has the advantage that the degree of opening of the main throttle is already in one while very low temperature range is progressively reduced with increasing temperature the choke remains immovable in its closed position in this temperature range. Through this a reasonable slow speed of the started engine can be achieved.

In the following, the invention will be explained by way of example with reference to the drawing.

F i g. 1 and 2 show in a longitudinal section and in a horizontal section along the line H-II 1 shows a carburetor according to the invention in the position which its parts assume when the Internal combustion engine is at a standstill and is at the limit of the two temperature ranges;

Fig. 3 shows a position when standing and cooled down Internal combustion engine;

F i g. 4 shows the position during operation of the internal combustion engine. ■ ■ _

709 640/126

The application of the invention to a downdraft carburetor with a starting device with an eccentric flap can be done as follows:

The carburetor consists of an intake duct 1 with an air inlet 2 and a system for introducing the primary mixture, which for clarity the drawing is not shown and can be of any known type.

The cold starting device

a pneumatic system works, which moves it forward when the one behind the Throttle body 6 prevailing negative pressure exceeds the absolute value after a certain value.

The cam 8 is preferably arranged coaxially to the axis 16, for which purpose it is on a fixed Bush 20 is freely rotatable, in which the axis 16 is mounted, the masses of the cam so distributed are that its center of gravity G is above the through

is formed by an eccentrically mounted flap 3 and forms the horizontal plane going through the axis 16, which is always arranged on an axis 4 in front of the above on the same side as that through the same introduction system (the direction of flow of the gases is shown in FIG. 1 by an arrow
indicated) and by the carburetor

Axis going perpendicular plane is so that the cam seeks to rotate in the sense mentioned.

The second thermostatic member 9 is through

sucked air flow against the action of a 15 a wound around the sleeve 20 bimetallic spiral formed first thermostatic member 5 (see Fig. 2) actuated, the central end of which is anchored, which seeks to close the flap when
the temperature of part of the engine under one

given limit value.

is fixed on this socket, while its opposite end 9 a is bent radially so that it forms one of the two stops, which

The usual throttle element 6 of the carburetor closes 20 with a pin 2l attached to the cam

cooperates. For this purpose, the thermostatic member 9 is set so that its end 9 a moves clockwise when it is heated (Fig. 1, 3 and 4).

The second stop member is formed by a knee 17 d of the lever 17, which cooperates with a projection 8 b of the cam 8, the thermostatic member 5 also being set so that when it is heated, the lever 17 clockwise.

formed by a rotary flap, which on a
Axis 7 mounted behind the delivery system
is and is operated by the usual acceleration control, not shown, which, if
she is released, the throttle organ in its 25th
seeks to trace back the smallest opening position,
which by a cam 8 for the accelerated
Slow speed can be set. For this purpose, for example, the cam actuates an adjustable stop 10 through steps 8a, which is rotated by one of the directions (Figs. 1, 3 and 4). Axis 7 of the throttle member 6 attached lever 11 The pneumatic system is through a

will be carried. . Piston 24 is formed, which has a cylinder 25 in

The eccentrically mounted flap 3 is divided with the two chambers, one of which is connected by thermostatic member 5 by means of a linkage to a channel 26 with one in the line 1 behind which, for. B. through an opening 27 opening on the axis 4 35 throttle member 6 connected to the flap 3 attached lever 13, a handlebar 14 is. The piston 24 is connected by a link 28 with a lever 15 and an axis 16, to which a stop 17 b of the lever 17, to which this latter lever and a lever 17 are attached, has an angled lever 17 d . To be formed. The thermostatic member 5 is withdrawn through the end 9 a of the thermo-formed by a bimetallic spiral. A stop 40 static member 9 formed stop has the end 17 a on the lever 17 engages on the outer hook lever 17 a stop 17 c, which on this

End hits when the piston 24 is sucked in.

The two thermostatic members 5 and 9 are expediently at a short distance from one another placed in the same chamber 12, which is heated when starting.

The chamber 12 is preferably in the vicinity of the throttle member 6, so that the axis 7 is immediately enter this chamber and the lever 11 on the

shaped end of the spiral 5, the inner end of which by insertion into a fixed pin 18 is held. The spiral 5 is held on the pin 18 by a spring ring 19.

The cam 8 is by the thermostatic member 5 in a first temperature range (z. B. over + 20 ° G) and by a second, also from

the temperature of part of the engine
thermostatic member 9 can be attached in a below the first 5 ° end of this axis. Temperature range lying temperature range (at To enable the setting

the selected example below + 20 ° C), where the design is such that the second thermostatic element is put out of operation,

the bias of the bimetallic spiral 5 are expediently the walls of the chamber 12 by a solid housing 22, through which the axis 16 goes, and through

as soon as the motor has started, namely with a cover 23 supporting the shaft 18, depending on the temperature of the same. which is loaded by devices not shown

For this purpose, the cam 8 can be attached so that it is freely rotatable, but is constantly in the Seeks to turn meaning which turns it into the smallest

which allow its rotation with respect to the housing 22.

The chamber 12 is z. B. heated in that opening of the throttle member 6 determining position ⁶ ° flows into it hot air, which brings from one in the (clockwise in Fig. 1, 3 and 4), the proximity of the exhaust pipe 30 of the engine over-rotation of the Cam 8 in this sense comes through two continuous pipe 29 and is limited by a stop which is controlled by the thermal bond between the chamber 12 and a downstream static members 5 or 9, the throttle body 6 located point of the main switch are so set that the two stops 65 line 1 is put into circulation, for. B. by means of a simultaneously formed at the boundary of the two temperature in the piston 24 bore and the areas are effective, whereby on the of the channel 26, the lower part of the cylinder 25, the second thermostatic member controlled connection with the chamber 12 in Connection. the

Chamber 12 can also be heated by an electrical resistor arranged in it, which is energized when the engine is started, or by a cycle of hot liquid in the walls of the lid 23. The housing 22 and the lid 23 consist preferably made of a thermally insulating material, e.g. B. plastic, and the spiral 5 can be provided with a shield 31 limiting their heating.

The above carburetor works as follows: At an average temperature (limit of the two temperature ranges), e.g. + 20 ° C, the parts take with the engine at a standstill after a partial opening of the throttle element 6 to release the cam 8 by separating its stages 8 a from the Screw 10 into the positions shown in FIG. The flap 3 is closed. The throttle element 6 assumes a more open position than the position of slow running in the warm state, which corresponds to an intermediate position of the cam 8. The cam itself is stopped in this position by the contact of its extension 8 & with the angled lever 17 d of the lever 17 (actuated by the thermostatic member 5) and at the same time its pin 21 with the end 9 a of the thermostatic member 9.

If the temperature is higher than the above mean temperature, the thermostatic member 5 deforms less quickly when it is heated than the thermostatic member 9 and then determines the position of the cam 8 by resting the angled lever 17 d on the projection 8 b of the cam.

When the temperature is lower than the above mean temperature and e.g. B. 0 or -20 ° C, as is known, the opening of the throttle member 6 must be compared to the case of FIG. 1 can be enlarged. This additional opening cannot take place through the lever 17, the rotation of which in the counterclockwise direction (FIGS. 1 and 3) is prevented by the linkage 13, 14, 15 by the flap 3, which is then completely closed. In this case, the end 9 a of the thermostatic member 9 takes the position of F i g. 3 after it has driven the cam 8 with its pin 21 in the counterclockwise direction, whereby the throttle element 6 is opened more strongly. In order to start up the engine, this organ assumes a position of accelerated slow speed in all cases, which actually depends on the ambient temperature.

As soon as the engine has started, the piston 24 is raised and the flap 3 opens to a certain angle. The piston 24 pivots the lever 17 clockwise, and the stop 17 c lifts the end 9 a of the thermostatic member 9 from the pin 21 (FIG. 4). If the driver does not touch the accelerator pedal, the rotary flap 6 remains locked in the position it was previously in (fully extended position). However, when he steps on the pedal, he releases the cam 8, which then rotates clockwise as a result of the position of his center of gravity G to the position shown in phantom. In this position, the approach 8 b of the cam 8 comes into contact with the angled lever 17 d of the lever 17, or the pin 21 comes into contact with the end 9 a of the thermostatic member 9, which was previously pushed aside by the stop 17 c . The throttle element 6 then assumes a further closed position for the accelerated slow speed, which causes a less high speed of the engine than at the start.

According to the heating of the thermostatic member 5, the piston 24 goes into its limit position, at the same time the flap 3 goes into the position of its full opening.

The end 9 α of the thermostatic member 9 follows this movement, either as a result of its own heating or as a result of the pressure exerted thereon by the stop 17 c, which allows the cam 8 a gradual rotation in the clockwise direction, if it was previously through the opening movement of the throttle member 6 was released.

As soon as the piston 24 has reached the end of its stroke, the possible position of the cam corresponds 8 the position for normal slow running of the engine.

The invention therefore makes it possible at any ambient temperature at the moment of starting to obtain a precisely determined position of the cam, which is determined by a first thermostatic Main term for temperatures which are equal to or above a given temperature (+ 20 ° C) and by a second thermostatic element for temperatures below this given temperature Temperatures is determined, at the same time the effect of the second thermostatic element is canceled as soon as the engine has started is.

Claims (5)

Patent claims: 1. Carburetor for internal combustion engines with an eccentrically mounted, eccentrically mounted, via linkage of a first thermostatic member depending on the operating temperature of the internal combustion engine against the intake air flow when the temperature falls below a specified temperature in the closed position and a second thermostatic member, which is arranged eccentrically in the air duct ln ~ \ Dependency _ "^ erJ operating temperature of the BrennkräffmascEine _._ over a ^ n__Nocken ___ the" S ^^ steriungjderJ ^ upta ^ s ^ Jbegreaizt, characterized in that the first thermostatic member (5) also has a stop on the cam (8) in a temperature range that is independent of the range of action of the second thermostatic element acts and that this second thermostatic element (9) is ineffective when the internal combustion engine is running. 2. Carburetor according to claim 1, characterized in that that the cam (8) is arranged so that its center of gravity (G) over the through its axis of rotation (16) extending horizontal plane and always on the same side of the through the same axis along the perpendicular plane lies. . 3. Carburetor according to claim 2, characterized in that the second thermostatic member (9) is formed by a bimetallic spiral and the stop controlled by it by the radially bent end (9 a) of this spiral. * 4. Carburetor according to claim 3, characterized in that a second stop is formed by a projection (17 d) of a lever (17), on which on the one hand the first thermostatic member (5) and on the other hand a on the negative pressure responding piston (24) act. 5. Carburetor according to claim 1, characterized in that the two thermostatic Links (5 and 9) in the same through the The same facilities heated chamber (12) are arranged. Documents considered: German Patent No. 625 628; French patent specification No. 1,252,692. 1 sheet of drawings