Engine torque and power characteristics
(2) Engine failure analysis example
According to the relevant specifications of the engine test run-in, after assembling tests on several engines, the specific problems exposed by the assembly and reliability test are summarized in Table 3.
Through the analysis of the fault phenomenon exhibited by the above engine, it is found that the main problems are manifested in three aspects. Firstly, due to insufficient oil pressure, poor lubrication effect, high temperature, excessive expansion and deformation of the piston, improper clearance of the piston ring, etc., the piston clearance cylinder is broken, and the piston is pulled; secondly, the crankshaft bearing and the connecting rod are matched. The clearance is too poor, the assembly clearance of the connecting rod big hole, connecting rod and connecting rod neck does not meet the requirements, the bearing bush and the bearing seat are oiled incorrectly, the oil film gap cannot be formed (the crankshaft neck is the same), and the oil pressure is insufficient to cause multiple tiling The occurrence of burning tiles. The third is due to the fact that the raw material specifications and heat treatment hardness of the bearing bush, camshaft and other components have not met the design requirements, resulting in related engine failure.
After the fault tree analysis of the above problems, the quality of the parts is improved, the key parts of the assembly are controlled, and the test plan is repeatedly explored, and a series of problems in the engine development process are gradually solved. If the oil pressure is insufficient, the oil pump is optimized to increase the oil pressure and flow rate by 20%. For the reliability test, the gap is properly enlarged on the existing basis; the clearance, lubrication and temperature are ensured to ensure the stability of the engine. Reliability and durability requirements.
5, summary
This paper focuses on the key technologies in the development of a 10000r/min high-speed engine, and explains the key elements and control aspects of the manufacture, assembly and testing of the engine core components. At the same time, the faults in the engine test process are carried out. The example analysis application provides a certain guiding role for the development of new engines, and hopes to help readers.
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Sanitary Pressure Relief Valves
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