| As one of the important parts of piston rings constitute the combustion chamber, the poor working conditions of high temperature, high pressure and friction of its strong performance has a huge challenge, and piston rings directly affect the engine’s power, economy, emissions performance and reliability sex and life. Therefore, the study of the performance of engine piston rings is significant.Articles based on the existing standard piston rings, made of three single gas ring superimposed composite piston ring installed in the new structure with a ring groove and theoretical analysis of the feasibility of such a structure. Meanwhile reasonable experimental program to build a test bench, one of the new composite piston rings and piston rings traditions were carried out to measure the static pressure of time, and calculate the amount of static leakage. On the other hand the new composite piston rings and piston rings traditional dynamic tests were carried out, were equipped with the new measure took composite piston rings and piston rings traditional single-cylinder machine at different speeds and maximum compression pressure inside the cylinder temperature. Dynamic test data taken using the measured, calculated two types of rings in the compression stroke air leakage, the amount of leakage resulting compression stroke and speed, the relationship between the compression stroke value and the amount of leakage of the cylinder temperature, to analyze the new composite type piston ring the leak rule.Results show that the static experiment, with the starting point of 0.5MPa pressure leak to the atmospheric pressure, the new type piston ring pressure holding time increase 473s; When compared to conventional piston ring and the air leakage of new type piston ring cylinder pressure at 0-0.3MPa,0.3-0.5MPa,0.5MPa pressure of three section, two kinds of piston ring compression stroke air leakage are respectively 0.792 ′ 10-4kg/s,1.585 ′ 10-4kg/s,1.887 ′ 10-4 kg/s,in general, the average air leakage difference value of 1.421 ′ 10-4kg/s,can get more advantage in high voltage phase of new type piston ring in the air tightness. In dynamic test, the rotating speed is 180-300 rmin/, 300-1000 rmin/, 1000 rmin/ three stages, air tightness: equipped with top of new type piston ring cylinder compression pressure is higher than with the traditional maximum compression pressure of piston ring cylinder are: 0.192 MPa, 0.237 MPa, 0.321 MPa, in general, with the increase of rotational speed the added value of new type piston ring average maximum compression pressure of 0.25MPa;Of new type piston ring compression stroke compression stroke air leakage of air leakage is lower than the traditional piston ring are: 0.467 ′ 10-4 kg/s,0.839 ′ 10-4kg/s, 1.103 ′ 10-4kg/s,overall, with the increase of rotational speed new type piston ring compression stroke air leakage by an average value of 0.803 to 10-4 kg/s, get the whole speed range of new type piston ring tightness is superior to the traditional piston ring. Thermal conductivity: a new piston ring of temperature in the cylinder and cylinder shrinkage temperature compared with traditional piston ring is respectively: on average, compared with the latter is were 8.3℃,11.85℃,low below 20.67℃.Overall, low speed stage cylinder temperature is higher, is advantageous to the diesel engine start, and with the increase of rotational speed is equipped with new type piston ring cylinder in the average temperature of 8.07℃,with a new type piston ring increase flattens the temperature in the cylinder, and is equipped with conventional piston ring cylinder temperature increase more steep, the thermal conductivity of the shows on the stage of new type piston ring has more advantages. |
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