SU1384807A1 - Two-stroke gasoline internal combustion engine - Google Patents

Abstract

The invention improves engine efficiency. On the side surface of the main piston (P) 2, flange I9 is made with seal 20 and oil sump 21 devices and with a diameter equal to the diameter of the larger stage

Description

Petrol

P

(L

I will air

CjO 00 4

sc

cylinder 1, and at and above the flange of the hole 22. Auxiliary 12 is made in the form of a ring with inlet and outlet devices, covering the skirt P 2 and installed in the grooves 26,27 between the cylinder and the crankcase 10. Blowing channel 28 through the exhaust device in I2 communicates with a compression chamber 34 associated with an intake passage and having a volume of 1.35-1.85 cylinder volume. The crankshaft 8 is provided with a cam 17, and the fuel supply device is in the form of a spray gun 18 with a pressure pump 15, kinematically connected with the cam. Arrange

84807

The properties of the inlet and outlet in P 12 can be either in the form of gold. or plate valves 24,25. Such an implementation permits a layer-by-layer distribution of the fuel charge in the combustion chamber 13 (the more enriched part of it is located in the spark plug zone) at the compression stroke, and during the working cycle to ensure efficient blowing of the cylinder with clean air. The change in engine speed is made by moving the cam in the direction of the crankshaft axis. 3 hp f-ly, 1 yl.

one

The invention relates to mechanical engineering, in particular to engine construction, namely to two-stroke internal combustion engines.

The aim of the invention is to increase efficiency.

The drawing shows the scheme of the proposed engine.

The engine contains a stepped cylinder 1 with a smaller diameter in the upper part, the main gearbox 2 with the sealing device 3 and the oil removal device 4 and 5, the cylinder head 6 with the spark plugs 7, the piston reciprocating movement mechanism rotational movement of the crankshaft 8 mounted on bearings 9 in crankcase 10 with pan II, auxiliary piston 12 mounted in the lower part of cylinder 1, combustion chamber 13 formed by pressure 2, head 6 and wall 14 of cylinder 1.

The engine is equipped with a low-pressure fuel injection device in the form of, for example, a injection pump 15, which interacts through the rod 16 with the cam 17 of the crankshaft 8 and the sprayer 18 (or low-pressure fuel injection nozzle) installed in the upper part of cylinder I in the direction of the spark plug. 7 ignition. Pore 2 has a flange I9 with a sealing device 20 and a mas

u 5 0

0

five

An outer diameter equal to that of the larger stage of cylinder 1, at and above the flange 19, the piston is provided with openings 22. The secondary piston 12 is designed as a ring with sealing devices 23 and is provided with an inlet. 24 and exhaust 25 plate valves. The piston 12 is installed in the annular recesses 26 and

27 cylinder and crankcase respectively. The cylinder head 6 has a purge

28 and an outlet 29, which are closed by disc valves 30 and 31 interacting with the cams 32 and 33 of the timing mechanism.

The compression chamber 34 through the inlet plate valve 24 and the channel 35 is in communication with the air cleaner: 36. The chamber 37 with the holes 22 in the piston 2 is in communication with the crank chamber 38. The oil pan 11 is partially filled with oil 39.

The engine works as follows.

Tact compression. When the movement of the piston | 2 up from N. m.t. a change in volume takes place. The combustion chamber 13 and the compression chamber 34. The purge and outlet windows are closed by valves 30 and 31. The inlet valve 24 of the fixed piston 25 is opened and the cleaned air through the channel 35 enters the annular chamber 34. By means of the pump 15 and the spray gun 1 8. (Or the low-pressure fuel injection nozzle) gasoline injection into the upper part of the combustion chamber. This is carried out layer-by-layer distribution of the fuel charge in the combustion chamber; its more enriched part is located in the zone of the spark plug. When the piston reaches 2 in. M.t. With the ignition plug electrode 7, the fuel charge ignites and the combustion products expand.

Working tact. Under the action of overpressure, piston 2 moves downwards. The forward movement of the piston is converted by the crank drive mechanism into the rotational movement of the crankshaft 8. At a given moment, the valve 31 under the action of the cam 33 opens and exhaust gases are released into the atmosphere. Then the purge valve 30 is opened (under the action of the cam 32) and the air precompressed in the chamber 34 and the channel 28 rushes into the combustion chamber 13, carrying out its further purging.

Effective purging of the cylinder with clean air is possible under the condition that the volume of the annular compression chamber is somewhat greater than the volume of the combustion chamber. A sufficient condition for reliable blowdown is their ratio of 1.35-1.85.

When the piston reaches 2 n.m.t. channels 28 and 29 are closed by valves 30 and 31 and a second process begins — a compression stroke.

The change in the engine speed is made, for example, by moving the cam I7 of the fuel delivery mechanism in the direction of the axis of the crankshaft 8. When the cam is moved to the left, the stroke 16 of the injection pump 15 decreases, and when it moves to the right, it increases. This achieves a change in the amount of fuel fed to the combustion chamber.

The lubrication is carried out with the help of an oil pump (for lubricating the timing mechanism) and oil mist formed in the crankcase during engine operation (for lubricating the cylinder steps through the holes in the piston 5 and 22).

Claims (4)

1. A two-stroke gasoline internal combustion engine containing a step cylinder with a step of smaller D1 meter in the upper part, the main piston located in the st-. a foam cylinder and connected to the crankshaft by means of a crank mechanism located in the crankcase, a cylinder head with light. ignition, a combustion chamber formed by a main piston, a cylinder head and a wall, a fuel supply device, an auxiliary piston installed in the lower part of a cylinder, a compression chamber and an inlet duct characterized in that, in order to increase efficiency, a flange is made on the side surface of the main piston with a sealing device and oil drain and with a diameter equal to the diameter of the larger step cylinder, and at the level and above the flange-hole, the auxiliary piston is made in the form of a ring with inlet and outlet devices, covering the main piston skirt and installed in the recesses between the cylinder and the crankcase, the cylinder head is equipped with purge and exhaust channels with actuating valves; release device during auxiliary-. the piston communicates with a compression chamber connected to the intake passage, the crankshaft is provided with a cam, and the fuel supply device is designed as a sprayer with injection pump kinematically associated with the crankshaft cam. 2. The engine according to claim 1, about tl and - due to the fact that the device The inlet and outlet in the auxiliary piston are made in the form of spools. 3. The engine according to claim 1, characterized in that the intake and exhaust devices in the auxiliary The piston is made in the form of plate valves. 4. The engine according to claims 1 to 3, wherein the compression chamber is made with a volume of 1.35-1.85 cylinder volume.