SU1724913A1 - Cooled cylinder of internal combustion engine - Google Patents

Abstract

This invention relates to oil-cooled internal combustion engines. The goal is to increase reliability by improving the thermal state by reducing the unevenness of the temperature field of the cylinder and reducing mechanical losses. The cylinder contains a sleeve 1, which is pressed into the jacket 2, in which the annularly connected annular cooling cavities are made: the lower 4, the intermediate 5 and the upper 7, with the lower cavity communicated by the isolated channel 6 with the upper cooling cavity. 1 hp f-ly, 4 ill.

Description

, Fig 7

This invention relates to oil-cooled internal combustion engines.

Known cylinders of engines with liquid cooling, the cooling cavities of which are formed by a jacket and a wet sleeve. These cylinders do not have any partitions inside the cooling cavities.

The disadvantage of these cylinder designs is that they do not organize the movement of fluid through the cooling cavity, which leads to the formation of stagnant zones and, consequently, to a large unevenness of the temperature fields of the cylinders.

The engine cylinder with oil cooling is known, in which the cooling cavity is designed as a helical channel.

The well-known cylinder consists of a shirt, on the inner surface of which a helical shoulder is made, and a wet sleeve, pressed into the shirt. The helical channel is formed by a helical shoulder of the sleeve, the inner diameter of which is equal to the outer diameter of the cylinder liner,

. The cooling oil is supplied to the bottom of the screw channel, then it rises through the screw channel to the upper zone, from which it is withdrawn into the cylinder head.

A disadvantage of the known construction is that the oil, passing through the cylinder from the bottom up, heats up and enters the upper part of the oil already heated, as a result of which the cooling of the hottest upper zone of the cylinder is deteriorated, which leads to a high temperature unevenness along the length of the cylinder, and therefore to significant deformations of the cylinder, deterioration of the working conditions of the piston, an increase in mechanical losses and a decrease in reliability.

The purpose of the invention is to increase the reliability of the engine by reducing the unevenness of the temperature field of the cylinder.

This goal is achieved by the fact that a cooled engine cylinder containing a sleeve and a jacket with series-connected annular cooling cavities has an additional channel isolated from annular cavities, the output edge of which is located in the upper annular cooling cavity in the inlet zone of the cooler to the upper annular cooling from the previous cooling cavities.

This cylinder design provides a supply of cooling oil directly to the top most hot in seconds, which achieves the most uniform temperature field along the length of the cylinder, and hence its best thermal state.

FIG. 1 shows the construction of a cylinder; in fig. 2 is a section A-A in FIG. one; on

0 fig. 3 is a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

The cylinder contains a wet sleeve 1, pressed into the shirt 2, which are made in series

5 annular cooling cavities: bottom 4, intermediate, 5 (in this case one), top 7.

The oil is introduced into the lower cavity through the opening 3 and withdrawal from

0 the upper cavity through the opening 8. An additional channel 6 is made in the jacket, which connects the lower cavity 4 to the upper cavity by means of an output edge 12, which is located in the zone of entry of body coolant into the upper annular cavity 7 from the previous cavity 5. To organize the oil ring movement a vertical partition 9 is made along the cavities in them.

The cylinder cooling system operates as follows.

The cooled oil is fed by an oil pump through the inlet 3 to the lower cavity of the cylinder, where it is divided into

5 two streams, one of which is directed along the lower annular cavity 4, and the other through channel 6 directly into the upper cooling cavity 7. First stream, passing the lower cavity, through channel 10

0 enters the middle cooling cavity and, having passed through it through channel 11, enters the upper cavity 7. Here, this heated stream is mixed with cold oil entering through channel 6. Then

5, this cooled oil passes through the uppermost hottest annular cavity 7, after which it passes through the outlet opening 8 into the cylinder head. Consequently, the head enters more

0 cold oil, thereby reducing its thermal state.

Due to this organization of the flow of oil, the temperature of the cylinder is equalized along its length, which improves

5 is its thermal state and piston operating conditions due to the lesser deformation of the cylinder liner, and, consequently, the reliability of the engine is increased.

Tests of the proposed cylinder showed that the temperature difference along the length

cylinder on the most loaded mode is reduced by 18-20 ° C.

Claims (2)

Claims 1. A cooled cylinder of an internal combustion engine comprising a cylinder liner and a jacket with series-connected annular cooling cavities, characterized in that, in order to increase reliability, in a jacket An additional channel, isolated from annular cooling cavities, is made, connecting the lower cavity with the upper one. 2. The cylinder according to claim 1, wherein the output edge of the insulated channel is located in the upper annular cooling cavity, in the zone of entry of the cooler into the upper annular cooling cavity from the previous cooling cavity, Fig.Z FIG. four