SU1236137A1 - Floatless carburetter for two-stroke internal combustion engine - Google Patents

Description

FIELD OF THE INVENTION The invention relates to mechanical engineering, in particular, to floating carburetors for two-stroke internal combustion engines.

The purpose of the invention is to reduce fuel consumption and increase engine stability by reducing the mixture enrichment during idling.

The drawing shows a schematic diagram of a floating carburetor for a two-stroke internal combustion engine.

The carburetor includes a housing 1 with a diffuser 2 and a mixing chamber 3, located behind the throttle valve 4, the air damper 5, the main metering system, contains the fuel line 6 with an adjustable throttle formed by the adjusting screw 7, and an idle system having the spray gun 8 and the fuel line 9 with a choke of adjustable cross section formed by the adjusting screw 10. The fuel lines 6 and 9 are connected to the fuel chamber 11 formed by the housing 1 and the membrane 12. The mixing chamber 3 is connected by an air channel 13, this position the nozzle 14 is installed, the air chamber 15 with a pressure regulator, koto- pa through the channel 16 in which a nozzle 17 is connected to the atmosphere. The fuel chamber 11 is provided with a valve made in the form of a tapered elastic sleeve 18 protruding from the body 1 and a locking element formed by the lever arm 19 connected to the membrane 12. The chamber 20 formed by the spacer 21 and the membrane 22 is connected through the channel 23 to the crank chamber of the engine and is the booster pump's air chamber. The chamber 24, formed by the pump cover 25 and the membrane 22, is the fuel chamber of the priming pump and is provided with an inlet 26 and an exhaust 27 valve and a fuel supply channel 28.

The carburetor works as follows.

With the help of a booster pump operating from the pulsating pressure supplied from the crankcase through channel 23, fuel from the tank enters through the channel through inlet valve 26 into chamber 24, from which through exhaust valve 27 through channel 28 to valve 18 of fuel chamber 11, and into the membrane 12 is affected by the vacuum that is transmitted through the idle system channels

Make up. 11. V. Erokhov

Editor O. GolovachTekhred I. VeresKorrektor V. But ha

Order 3004 / .35 Circulation 523Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

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stroke and main dosing system. Under the action of a vacuum, the membrane 12 bends, presses the lever arm 19, which moves away from the sleeve 18, and the fuel enters the chamber 11, from which, depending on the operating mode, enters either the idle system or the main dosing system.

When the engine is running at idle or low loads, the throttle valve 4 is in the fully closed or small open position. The vacuum from the throttle valve 4 from the mixing chamber 3 is transmitted through the openings of the atomizer 8 through the fuel line 9 to the fuel chamber 11 of the pressure regulator. Fuel from chamber 11 goes to atomizer 8, where it mixes with air m and enters the engine intake tract as an emulsion. The composition of the mixture in these modes is controlled by screw 10 and corrected by changing the vacuum in the air chamber 15 of the fuel regulator, the air from which is sucked through channel 13 and the nozzle 14 and flows from the atmosphere into the chamber through the nozzle 17. The change in vacuum in the mixing chamber 3 causes chamber 15, which in turn causes a change in pressure in fuel chamber I and a change in fuel consumption during idling and low loads.

As the opening of the throttle valve 4 increases, the vacuum behind it decreases, causing a reduction in fuel consumption through the idle system. At the same time, the vacuum in diffuser 2 increases, as a result of which fuel begins to flow into the intake tract through the main dosing system. The vacuum in chamber 11 is maintained at the required level by means of a membrane 12, which, while increasing the vacuum in chamber 11, moves lever 19, increasing the flow of fuel into chamber 11 through valve 18. The supply of fuel by the main metering system is determined by the screw section 7. When the engine is started, the valve 5 is shifted to the “Closed” position; when air passes through the intake path, fuel enters the diffuser 2 through both systems.

The proposed implementation of bespoplavkovogo carburetor reduces fuel consumption and increase the stability of the engine.

Claims (1)

FLOAT-FREE CARBURETOR FOR A TWO-STROKE INTERNAL COMBUSTION ENGINE, comprising a housing with a mixing chamber and a diffuser, an air and a throttle shutter and an enrichment with a button, a pressure regulator with an air chamber, a main metering system and an idle system, with a sprayer connected to each of the systems an adjustable throttle to a fuel chamber formed by a housing and a membrane and provided with a valve connected to the membrane by a lever, characterized in that, for the purpose of lower eniya fuel consumption and improve the stability of engine operation by reducing pereobogaschenie mixture at idle, the air pressure control chamber communicates with the atmosphere through the orifices and the mixing chamber. u s o With