1.内燃机可靠性国家重点实验室，山东 潍坊 261061；2.潍柴动力股份有限公司，山东 潍坊 261061
Abstract：In order to solve the problem of high overall sound pressure level of air compressor during air injection in the test process of a diesel engine, the sound pressure level test and wavelet transform of the diesel engine are carried out. The noise of the diesel engine is determined as gear knocking noise from the perspectives of engine near-field noise and gear chamber vibration. By analyzing the generation mechanism of gear noise, the influence of gear side clearance of spur gear on gear knocking noise and the noise reduction principle of shear gear, the optimization scheme of replacing the intermediate transition gear of gear system with shear gear is determined and verified. The test results show that the knocking noise of gear can be significantly reduced by using shear gear.
Keywords:diesel engine; spur gear; shear gear; knocking noise; gear side clearance