RU2235893C2 - Engine uniform cooling system design - Google Patents

Abstract

FIELD: mechanical engineering; engine cooling.

SUBSTANCE: according to invention, in proposed engine cooling system consisting of cylinder block cooling jacket, channels in cylinder block head, thermostat, radiator and water pump, cooling liquid from water pumps is delivered into oil heat exchanger, and from oil heat exchanger, into cylinder block cooling jacket in two places first and second cylinders and between third and fourth cylinders, and is let out from cylinder block head in two places, from first and fourth cylinders.

EFFECT: provision of stabilization of temperature conditions of cylinders, valves and piston group.

2 cl, 1 dwg

Description

The invention relates to the field of engine cooling.

In the prior art, a cooling system for an internal combustion engine, consisting of a cooling jacket for a cylinder block, channels in the cylinder head, a thermostat, a radiator, a water pump (USSR author's certificate 1560743, F 01 P 11/08, 1990).

A disadvantage of the known system is that the engine cylinders do not work in equally favorable temperature conditions, which reduces the service life of the valves and the piston group.

The objective of the invention is to stabilize the temperature of the cylinders, valves and piston group.

The problem is solved due to the fact that in the circuit of the engine cooling system, consisting of a cylinder cooling jacket, channels in the cylinder head, a thermostat, a radiator, a water pump, the coolant in it from the water pump is supplied to the oil heat exchanger, which is a pipe with ribs to increase the area of contact with oil passing through the oil sump, and from the oil heat exchanger to the cooling jacket of the cylinder block in two places between the first and second cylinders and between the third and fourth scuffed cylinders, and is discharged from the cylinder head in two places - from the first and fourth cylinders.

The invention is illustrated in the drawing, which shows a diagram of an engine cooling system. From the water pump 1, the liquid cooled in the cooling radiator 3 is supplied to the cooling jacket of the cylinder block to the first cylinder.

Part of the liquid, when heated, rises to the cylinder head, then the liquid enters the second cylinder. The temperature of this liquid is already higher than the temperature of the chilled liquid. When heated from the second cylinder, the liquid enters the third cylinder with a higher temperature than the cooled liquid. From the third cylinder, fluid flows to the fourth cylinder, where its temperature is even higher. Further, the liquid through the channels in the cylinder head returns to the third, second and first cylinder and through the thermostat 2 enters the radiator 3.

Roman numerals indicate cylinder numbers.

Experience shows that engine cylinders operate in various temperature conditions. The most severe temperature conditions are observed in the third cylinder. The most favorable temperature regime in the first cylinder. The second and fourth cylinders are in the middle position. This is evidenced by such engine repairs as lapping valves. As a rule, the valves of the first cylinder do not require lapping, as the valves are not sealed. The valves of the third cylinder are always leakproof and require intensive grinding. The valves of the second and fourth cylinders require minor lapping. The fourth cylinder is the most distant from the coolant inlet and should experience the most severe temperature conditions, but this does not happen because it is extreme, like the first cylinder, and is cooled by air from three sides.

According to this scheme, the ZMZ-406, Moskvich, VAZ 2101-VAZ 2107 engines are cooled, and all these engines exhibit uneven valve wear. The tightness of the valves is violated primarily in the third cylinder and, last but not least, in the first.

On the VAZ-2108 and VAZ-2109 engines, the cooling system diagram is different. From the water pump, the cooled liquid is supplied to the block cooling jacket to the first cylinder and passes through the channels of the block and cylinder head to the fourth cylinder, and from it is discharged to the radiator through a thermostat. With such a scheme of the cooling system, the temperature conditions of the cylinders are also different, but the difference is small. Therefore, the valves of the cylinders during repair require lapping with an increase from the first cylinder to the fourth.

On many engines, the temperature of the oil is not controlled or cooled. In hot weather, the oil temperature can reach 200 degrees. High oil temperatures degrade its lubricating properties and require frequent oil changes. When the oil temperature rises, the pressure in the lubrication system decreases, which reduces the engine’s engine life. On some vehicles, oil coolers are installed to cool the oil. The use of an oil cooler is always associated with a decrease in pressure in the lubrication system at medium and maximum loads, which is extremely harmful to the engine. The higher the oil temperature, the higher the oil consumption for waste.

The proposed engine cooling system includes an oil heat exchanger, which may be a pipe with fins to increase the area of contact with the oil passing through the oil sump of the engine. Coolant passing through the oil heat exchanger will cool the oil in the oil sump. This stabilizes the temperature of the oil and will be approximately the same as the temperature of the coolant. The oil temperature will be monitored by the coolant temperature sensor and cooled by the engine cooling system.

Coolant is supplied to the cooling jacket of the cylinder block in two places between the first and second cylinders and between the third and fourth cylinders, and the heated liquid is also discharged in two places from the cylinder head at the first engine cylinder and at the fourth engine cylinder. Thus, all cylinders will cool evenly and work under favorable temperature conditions.

Since the coolant will also cool the oil, it is necessary to increase the area of the fins of the radiator, increasing the number of tubes in the radiator.

The technical result.

1. All engine cylinders will operate in equally favorable temperature conditions, which will increase the service life of the valves and piston group.

2. Stable oil temperature will reduce oil consumption for waste and increase vehicle mileage between oil changes.

3. The reduction in pressure in the lubrication system from an excessive increase in oil temperature is excluded, which will positively affect all rubbing parts of the engine.

Claims (1)

The scheme of the engine cooling system, consisting of a cooling jacket for a cylinder block, channels in the cylinder head, a thermostat, a radiator, a water pump, characterized in that the cooling liquid from the water pump is supplied to the oil heat exchanger, which is a pipe with fins to increase the area of contact with oil passing through the oil sump, and from the oil heat exchanger to the cooling jacket of the cylinder block in two places between the first and second cylinders and between the third and fourth cylinders, and is discharged from cylinder head in two places - from the first and fourth cylinders.