SU1665250A1 - Stand for testing piston of engine - Google Patents

Abstract

The invention relates to engine construction and serves to accelerate the testing of pistons, while helping to bring the test conditions closer to actual conditions of operation of the piston. The stand contains a base 1, on which the test piston 2 is fixedly mounted and the electric heater 3, water for 4 and oil is mounted on the piston crown cooling systems. The oil on the cooling system is equipped with an oil supply pulsator 17, which is kinematically connected to the DC motor 18, hydraulically communicated through the oil line 19 to the oil pump 5, and through line 20 to the channels 13, 14 and 15 of the insert 9, in which the nozzles are placed tips 16 located below the oil level.

Description

The invention relates to mechanical engineering, in particular to engine-building, and can be used in testing pistons during the design and development of internal combustion engines.

The purpose of the invention is to bring the test conditions closer to the actual operating conditions and simplify the stand design.

The drawing shows the scheme of the stand,

The stand contains a base 1, on which the test piston 2 with a heater 3 on the bottom of the piston is placed on it, a cooling water jacket 4 to imitate a cylinder with cooling, and an oil cooling system for the bottom of the piston cavity. The oil on the cooling system includes an oil pump 5, a valve 6 for controlling the oil flow, an oil line 7 and a drain tank 8.

To determine the temperature fields and voltages on the test piston 2, thermocouples and strain gauges are installed that are connected by wires to measuring equipment (not shown).

Inside the test piston 2 at its bottom on the side opposite to the firing surface, is placed an insert 9, which forms a cooling cavity 10 with the bottom. Box 9 shows the channels. One of the channels 11 is connected by the oil pipe 7 to the oil cooling system. In another channel, an oil level limiter 12 is installed in the cooling cavity 10, made in the form of a tube placed at the channel exit into the cooling cavity.

The tube has a slice at an acceptable oil level and is connected to a drain tank 8. In the remaining channels 13-15 of the insert 9, nozzle tips 16 are placed with access to the cooling cavity 10, the sections of which are located below the slider of the oil level limiter 12.

The oil on the piston cavity cavity cooling system is equipped with a spool type 17 oil supply pulsator connected to a DC motor 18 and an oil line 19 — to an oil pump 5. A pulsator 17 is connected by a pipeline 20 to channels 13-15 of the insert 9, in which nozzles are placed tips 16.

To create a higher pressure of the oil supplied by the pulsator 17 to the nozzle tips 16 of the insert 9, the oil pressure regulator 21 is turned on in the oil cooling system of the piston cavity.

The piston test bench operates as follows.

Heat to the bottom of the piston 2 is supplied by the electric heater 3. The heating of the bottom causes its deformation and, as a result, voltage, the values of which

reach the highest values in the area of the sealing rings. The temperature and strain of individual sections are recorded by thermocouples and strain gauges and are controlled by instrumentation (not shown).

The circulation cooling of the piston 2 is carried out by an oil system. The oil from the drain tank 8 is supplied by an oil pump 5 through the oil line 7 and the insert 9 in

cooling cavity 1E. The required level of oil is maintained by a limiter 12, through which the excess oil is drained into the tank 8. The number of supplied oil is regulated by a valve 6 installed in

oil pipe.

The pulsed flow of oil into the cavity 10 is cooled as follows. Simultaneously with the supply of oil into the cavity 13 of the cooling oil pipe 7

through the veins of the gil 6, the oil from the oil pump 5 is fed through the oil to the wire 19 to the pulsator 17 supplying oil, the shaft of which is rotated by the electric motor 18.

In the pipeline 19 by valve 6 and

the pulsator 17 creates an overpressure determined by the regulator 21. From the pulsator 17 through the pipeline 20 doses of oil of LOD with increased pressure enter the channels 13-15 of the insert 9 and through the nozzles

the tips / ki 16, located under the oil layer h, shoot into the bottom of the piston, carry along the oil in the cavity and thus create an oil splash, thus imitating the intense agitation of the engine, corresponding to the actual conditions of cooling of the bottom of the piston during engine operation. The amount of oil supplied by impulses under high pressure and the frequency of impulses (agitations)

is controlled by the pulsator 17, which allows creating conditions similar to cooling the bottoms of the pistons of a real engine depending on the number of revolutions of the crankshaft.

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Claims (1)

Invention Formula A test bench for testing a piston of an internal combustion engine, containing a base for the fixed installation of the test piston, an electric heater for the bottom surface of the piston, an electric motor, a water cooling jacket with a piston inside, an oil cooling system piston bottom, containing an oil tank, oil-cooled piston cavity, an oil pump, a valve for regulating and sectioning which is located below the section of the oil and oil pipelines, inserts an oil level that distinguishes the piston located at its bottom by the fact that, in order to increase the reliability of the side opposite to the fire position test by approaching the top, and forming with the bottom the floor of the test to real conditions cooling bed, with insertion of oil, the system is additionally supplied with channels, one of which together contains an oil pulsator cheeks with an oil cooling system, an oil pressure regulator, and the other has a level limiter installed; 10 s is kinematically connected to the elec- tromise in the form of a tube placed from you engine and hydraulically - with an oil the course from the channel to the cooling cavity by the pump and the pipeline with channels having a cut at an acceptable level May-inserts, in which nozzle and in the remaining channels the inserts are spaced tips, and the pressure regulator has nozzles. The tips with an outlet 15 are supplied at the outlet of the oil pump.