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Analysis and Solution of Gear Knock of Manual Transmission

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DOI: 10.23977/jemm.2024.090110 | Downloads: 38 | Views: 210


Haiming Ni 1, Yongan Luo 1, Xinchuan Qin 1, Tianxin Hu 1


1 Liuzhou Yingqin Tuolan Automobile Technology Co., LTD., Liuzhou, Guangxi, 545006, China

Corresponding Author

Yongan Luo


Manual transmission gear knocking is a common transmission noise. It is the noise generated by the continuous impact of the non-working tooth surfaces of the active tooth and the passive tooth of the gearbox hollow sleeve gear under the excitation of the engine torque vibration. Gear knocking noise is an obvious broadband noise characteristic in the cab, which cannot be effectively eliminated by optimizing the acoustic package of the vehicle alone. The common solution in engineering is to reduce the clearance of the gear pair and reduce the speed fluctuation and torque vibration at the input end of the transmission to eliminate the knocking noise. This paper takes a manual transmission gear knocking problem in the actual production process as an example, starts from the mechanism of gear knocking, analyses the transmission gear knocking noise, analyses the transmission gear knocking problem through noise testing, engine torsional vibration testing and driver and passenger subjective evaluation, and verifies the improvement measures through experiments. Finally determine the solution for the gear knocking noise.


Manual Transmission, Gear Knock, Noise, Angular Acceleration


Haiming Ni, Yongan Luo, Xinchuan Qin, Tianxin Hu, Analysis and Solution of Gear Knock of Manual Transmission. Journal of Engineering Mechanics and Machinery (2024) Vol. 9: 60-68. DOI:


[1] Qingbin Deng, Peng Li, Meng Jiao. Research on transmission gear knocking noise. Noise and Vibration Control, 2018, (4): 59-61.
[2] Xiaolei Xiang, Dexin Chen, Songsong Li. Gear knocking Noise Theory and experimental research of double-countershaft manual transmission. Automotive Technology, 2014, (11): 1-6.
[3] Xiaoying Ma, Guomin Peng, Bo Yu. Research and Optimization of Idle Knock Noise of Automobile Manual Transmission. Automotive Technology, 2011, (10): 151-159.
[4] Morozov Sae. Heat Transfer Coefficient of Impeller Rim of High-power Steam Turbine Based on Deep Neural Network. Kinetic Mechanical Engineering, 2022, 3(1): 1-8. 
[5] Kothapalli Bisen. Optimization Design of Injection Pump Cam of Single Cylinder Direct Injection Diesel Engine Combined with Artificial Intelligence Algorithm. Kinetic Mechanical Engineering, 2022, 3, (2): 37-45. 
[6] Bulychev Nikolay. Manufacturing of Automobile Engine Crankshaft Dependent on Computational Fluid Mechanics. Kinetic Mechanical Engineering, 2021, 2(4): 1-10.

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