RU29967U1 - Fuel injection system in a two-stroke engine combustion chamber - Google Patents

Description

FUEL INJECTION SYSTEM IN THE COMBUSTION CHAMBER OF A TWO-STAGE ENGINE.

The utility model relates to engine building and can be used in fuel injection systems in the combustion chamber of a two-stroke engine with a working piston.

A known system of fuel injection into the chamber of an internal combustion engine, which contains a housing with a fuel supply chamber, a device for generating pressure in the chamber in the form of a plunger having the possibility of reciprocating motion, and a spray. The movement of the plunger is controlled by a solenoid. (US patent No. 3796205, MKI F02m 39/00, publ. March 12, 1974)

Also known is a system for injecting fuel into the combustion chamber of a two-stroke engine with a working piston, which comprises a housing with a fuel supply chamber, a device for generating pressure in this chamber, including a spring-loaded plunger, one end of which is located in the fuel supply chamber, and a sprayer with a spring-loaded needle installed coaxially with the plunger. Fuel is supplied to the chamber through the discharge channel and the inlet valve, whose axis is perpendicular to the axis of the plunger. The movement of the plunger is controlled by a solenoid. (Magazine Boats and Yachts No. 176 for 2001, p. 49, Fig. 2).

The presence in both systems of a solenoid and its controls significantly complicates the design of the system, increasing its size and weight.

Such systems have limited speed (up to 6000 rpm of the crankshaft) caused by magnetic hysteresis in the solenoid and a massive armature. In the coils of the generator, solenoid and control circuit, energy losses are inevitable, which reduces the efficiency of the system

In addition, the location of the inlet valve, when its axis is perpendicular to the axis of the entire system, increases its radial dimensions.

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fuel, reducing its weight and reducing dimensions due to the exclusion from it of the solenoid and its governing bodies, as well as increasing the speed of the system and increasing the efficiency.

The technical problem is achieved by the fact that the fuel injection system in the combustion chamber of a two-stroke engine with a working piston contains a housing in which the fuel supply chamber is located, communicated through an inlet valve with a discharge channel, a device for creating pressure in the chamber and a spray with a spring-loaded needle. The pressure generating device includes a spring-loaded plunger, one end of which is located in the fuel supply chamber. The needle is installed coaxially with the plunger.

New in the utility model is that an axial hole is made in the sprayer needle, the other end of the plunger is passed through this hole and has the ability to interact with the working piston of the engine.

To reduce the radial dimensions of the system, the inlet valve is located in the fuel supply chamber.

The attached drawing shows the proposed fuel supply system.

The fuel injection system in the combustion chamber of the engine of the stroke engine contains a housing 1, in which the fuel supply chamber 2 is located, communicated through the inlet valve 3 with the discharge pipe 4.

The system also contains a spray 5 with a needle 6, a spring-loaded spring 7, and a device for creating pressure in the chamber 2.

The device for creating pressure is a plunger 8 with a spring 9, one end of which is located in the fuel supply chamber 2, and the other is passed through the axial hole 10 in the needle 6 and is able to interact with the working piston 11 of a two-stroke engine. Plunger 8 and needle 6 are mounted coaxially.

The device operates as follows.

When the working piston 11 moves to the top dead center, it interacts with the end of the plunger 8 passing through the hole 10 of the needle 6. Under the action of the piston 11, the plunger 8 moves to the upper position, while overpressure is created in the chamber 2, under the action of which the needle 6, overcoming

the resistance of the spring 7 opens a gap in the atomizer 5, through which fuel is injected into the combustion chamber.

When the working piston 11 moves from the top dead center to the bottom dead center, the plunger 8 returns to its original position and through the discharge channel 4 and the inlet valve 3 the fuel supply chamber 2 is filled with fuel and the system is ready for the next injection.

Such a system is notable for its simplicity, reduced overall dimensions compared to known systems, stability of operation, and a higher efficiency coefficient.

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Claims (2)

1. The fuel injection system in the combustion chamber of a two-stroke engine with a working piston, comprising a housing in which a fuel supply chamber is located, communicated through an inlet valve with a discharge channel, a pressure generating device comprising a spring-loaded plunger, one end of which is located in the fuel supply chamber, and a sprayer with a spring-loaded needle mounted coaxially with the plunger, characterized in that an axial hole is made in the sprayer needle, the other end of the plunger is passed through this hole and is possible contact with the working piston of the engine. 2. The fuel injection system according to claim 1, characterized in that the inlet valve is located in the fuel supply chamber.