关键词: 增速箱异响；齿轮啮合；台架测试；NVH

Abstract: The speed increase box can be applied to a wide range of commercial vehicle hybrid market, and there will often be abnormal noise and lax sealing during use, resulting in oil emulsification and other problems. This paper provides an analysis and treatment method for the abnormal noise of the gearbox of new energy hybrid models, that is, through the analysis of bench test noise, vibration, harshness (NVH), unpacking inspection and component measurement, etc., it is confirmed that the cause of abnormal noise is abnormal wear caused by the reduction of meshing accuracy between the output shaft of the gearbox and the input shaft of the engine. This problem can be solved by improving the gear processing accuracy of the output shaft of the speed increase box, which provides solutions and ideas for the subsequent abnormal sound of the speed increase box, and can be widely promoted in the treatment of quality problems of hybrid models.

Key words: Abnormal noise in the speed increase box; Gear meshing; Bench testing; NVH