Description of the work of the carburetor 21053-1107010 (VAZ-2106, 1976-2006)

Pic. 11. Carburetor operation 21053-1107010.
1. Trigger adjustment screw; 2. Diaphragm of the starting device; 3. Trigger rod; 4. Electromagnetic shut-off valve; 5. Fuel jet idling; 6. The main air jet of the first chamber; 7. Air jet idling; 8. Idle flow channel; 9. Air damper; 10. Atomizer of the main dosing system of the first chamber; 11. Accelerator pump nozzles; 12. Atomizer of the main dosing system of the second chamber; 13. The main air jet of the second chamber; 14. Air jet of the transition system of the second chamber; 15. Carburetor cover; 16. Gasket; 17. Hole for balancing the float chamber; 18. Needle valve; 19. Fuel filter; 20. Fuel supply pipe; 21. Economizer diaphragm power modes; 22. Air channel economizer power modes; 23. Fuel jet economizer power modes; 24. Ball valve economizer power modes; 25. Float; 26. Fuel channel economizer power modes; 27. Fuel channel of the main fuel jets; 28. Fuel jet of the transition system of the 2nd chamber with a tube; 29. Emulsion tube of the second chamber; 30. The main fuel jet of the second chamber; 31. Carburetor body; 32. Outlets of the transition system of the second chamber; 33. Throttle valve of the second chamber; 34. Air channel of the starting device; 35. Opening of the air channel of idling; 36. Throttle valve of the first chamber; 37. Slot of the transition system of the first chamber; 38. Adjusting screw for the quality of the idle mixture; 39. Carburetor heating block; 40. Branch pipe for suction of crankcase gases; 41. Pipe for vacuum supply to the vacuum ignition timing controller; 42. The main fuel jet of the first chamber; 43. Emulsion tube of the first chamber; 44. Idle emulsion channel; 45. Accelerator pump ball valve; 46. Accelerator pump diaphragm; 47. Accelerator pump drive lever; 48. Thrust of the handle of the air damper drive; 49. Arm of fastening of a cover of draft of a drive of the air damper; 50. Adjusting screw for slightly opening the throttle valve of the first chamber; 51. Throttle actuator lever; 52. Choke control lever; 53. Accelerator pump fuel supply ball valve; 54. Accelerator pump drive cam; I. Carburetor operation at maximum engine power; II. The operation of the starting device; III. Carburetor operation at idle speed of the engine; IV. The work of the carburetor during the transition to medium loads; V. Operation of the accelerating pump.

Main dosing system is powered from the float chamber, into which fuel enters through the needle valve 18. Through the main fuel jets 42 and 30, the fuel enters the emulsion wells. With sufficient vacuum in the sprayers of the main metering systems, the fuel is mixed in emulsion wells with air entering through the main air jets 6 and 13, and is sucked into the diffusers of the mixing chambers in the form of an emulsion. Only the main dosing system of the first chamber operates in the throttling mode. The second begins to open and work when the throttle valve of the first chamber opens more than two-thirds.

Idle system provides the necessary composition of the combustible mixture at idle. In this case, the throttle valves 36 and 33 are closed. Fuel from the emulsion well of the main metering system rises through the fuel channel, passes through the fuel jet 5, mixes with air from the air jet 7 and the flow channel, and then enters the throttle space under the mixture quality screw 38.

Transition system of the first chamber provides a smooth transition of the engine from idling to throttling modes. At the moment of opening the throttle valve of the first chamber, the gap 37 of the transition system falls under vacuum. An emulsion will also flow from it, providing a smooth transition.

Transition system of the second chamber ensures a smooth transition of engine operation at the moment the throttle valve of the second chamber begins to open. At this point, holes 32 are under vacuum; fuel from the float chamber through the jet 28 rises up the tube, air is mixed from the air jet 14 and the emulsion enters through the emulsion channel through the outlet holes under the throttle valve.

Power mode economizer prevents a change in the degree of enrichment of the mixture due to the pulsation of the vacuum under the throttle, especially when the crankshaft speed decreases, when the pulsation increases and the vacuum decreases. The economizer ball valve 24 is closed as long as the diaphragm 21 is held by the throttle vacuum. With a significant opening of the throttle valve 36, the vacuum decreases slightly, and the diaphragm spring opens the valve. The fuel passes through the valve, the economizer jet 23, is added to the fuel passing through the main fuel jet 42, and equalizes the enrichment of the mixture.

accelerator pump - diaphragm type, driven by a cam on the axis of the throttle valve of the first chamber. With a sharp opening of the throttle valve, the cam presses the lever 47 and through the spring in the pusher acts on the diaphragm 46, overcoming the resistance of the return spring. The diaphragm supplies fuel through the supply ball valve and injects it through the nozzles 11 into the mixing chambers. During the reverse stroke of the diaphragm, under the action of a return spring, fuel is sucked from the float chamber through the check ball valve 45 into the working cavity of the accelerator pump.

Cam 54 has a special profile that provides double injection. Moreover, the second injection coincides with the beginning of the opening of the throttle valve of the second chamber.

Starting device ensures the preparation of a rich combustible mixture when starting a cold engine. When turning the lever 52 of the air damper control for the rod 48 counterclockwise, the outer edge of the lever 52 for the adjusting screw 50 slightly opens the throttle valve 36 of the first chamber. At the same time, the expanding groove of the lever 52 releases the pin of the choke lever, and it will be held completely closed by the return spring. The axis of the air damper is displaced, therefore, after starting the engine, the air damper can be slightly opened by the air flow, stretching the spring, which ensures that the mixture is leaner.

The vacuum from the throttle space, acting on the diaphragm 2, can slightly open the air damper by the stem 3. Adjusting screw 1 allows you to adjust the amount of damper opening.

Forced idle economizer disables idle system at forced idle (engine braking, downhill driving, gear shifting), which eliminates the release of carbon monoxide into the atmosphere.

The economizer includes a limit switch mounted on an adjusting screw 19 (see fig. 10) idle mixture quantity, solenoid shut-off valve 10, electronic control unit and electrical wires for connecting devices.

At forced idle, if the engine speed begins to increase, then the voltage to the winding of the solenoid valve 4 (see fig. eleven) is supplied until the electronic control unit, until the shaft speed exceeds 2100 rpm, although the limit switch is closed to "mass". At higher engine speeds, the ECM cuts off power to the solenoid shut-off valve, cutting off fuel supply to the idle system.

When the engine crankshaft speed decreases at forced idle to 1900 rpm, power is again supplied by the electronic control unit to the valve winding, and it opens the fuel supply through the idle jet, although the limit switch is closed to "mass".