Analysis and Solution of Gear Knock of Manual Transmission

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.