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| Research on Experiment and Calculation Method of the Whine of Engine Balance Shaft Scissor Gear Mechanism |
| DOI：10.13949/j.cnki.nrjgc.2023.06.008 |
| Key Words:scissor gear mechanism whine transmission error reverse rotation |
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| Abstract:Based on the theory of multibody dynamics， AVL EXCITE was used to establish a calculation model of the whine of 2.0 L engine balance shaft scissor gear mechanism. The model was then validated， and the whine was evaluated through vibration color map and the difference between gear order noise and total order noise. An analysis was conducted on the whining noise generation of the balance shaft scissor gear mechanism in a four-cylinder engine. Simultaneously， the effects of scissor gear mechanism spring stiffness and the direction of rotation （clockwise or counterclockwise） on the whining noise were examined. The research results show that the main reason for the whining noise during idle acceleration condition is the maximum transmission error between the driving gear and the floating gear of scissor gear mechanism. With the same spring preload torque， the transmission error with a spring stiffness 0.5 N·m/（°） decreases by approximately 7.2% in comparison to that with a spring stiffness of 1.0 N·m/（°）. The reverse rotation scissor gear mechanism acts as a damping system， reducing the floating gear angular acceleration by about 25% relative to the forward rotation scissor gear mechanism between 2 500 r/min and 4 000 r/min. This leads to a significant improvement in whining noise during idle acceleration condition. |
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