Leakage testing device suitable for high-pressure common rail transverse cavity oil inlet type oil injector of piston type diesel engine

Abstract

The invention discloses a leakage testing device suitable for a high-pressure common rail transverse cavity oil inlet type oil injector of a piston type diesel engine. The device comprises a heating box used for heating a cylinder cover oil injector assembly, a common rail pipe, a high-pressure oil pump connected with the common rail pipe, an oil delivery pump connected with the high-pressure oilpump and an oil consumption measuring instrument connected with the oil delivery pump and an oil tank, wherein the cylinder cover oil injector component comprises an engine cylinder cover and a transverse cavity oil inlet type oil injector arranged on the engine cylinder cover, the common rail pipe is connected with the transverse cavity oil inlet type oil injector through a high-pressure oil pipe, a fuel oil metering unit is arranged on the high-pressure oil pump, and a rail pressure sensor is arranged on the common rail pipe. The leakage testing device suitable for the high-pressure common-rail transverse cavity oil inlet type oil injector of the piston type diesel engine can quickly and accurately judge a leakage point of the transverse cavity oil inlet type oil injector with low cost.

Description

technical field [0001] The invention belongs to the technical field of engines. Specifically, the invention relates to a leak test device suitable for a high-pressure common-rail cross-cavity oil-injection injector of a piston diesel engine. Background technique [0002] Common rail technology and four-valve technology have been widely used in modern diesel engines, making the engine achieve good results in terms of performance and emission limits, and can meet the requirements of non-road T3 and Euro III emission limit regulations. Among them, the four-valve structure (two intakes, two exhausts) can not only improve the charging efficiency, but also because the fuel injector can be arranged in the center, the porous oil beam can be evenly distributed, which can create conditions for a good mixture of fuel and air; ultimately improve engine mixing The formation quality of gas can effectively reduce soot particles, HC and NOx emissions and improve thermal efficiency. [0003...

AI Technical Summary

Problems solved by technology

[0005] 1. The cross-cavity fuel injector and high-pressure connecting pipe are generally located inside the cylinder head, so it is difficult to visually judge whether the assembly is in place and whether the mating surface can effectively form a seal;

[0006] 2. The high-pressure connecting pipe installed on the aluminum alloy cylinder head is more susceptible to heat factors than the cast iron cylinder head, because the thermal expansion coefficient of general cast iron is 9.2 to 11.8, while the thermal expansion coefficient of aluminum alloy is 23.8, so after the engine heats up , the aluminum alloy cylinder head is more deformed by heat, and the resulting high-pressure connecting pipe is more likely to be separated from the fuel injector, and the risk of leakage is also greater

Images