The working principle and abnormal sound mechanism of the timing chain tensioner at the low speed are introduced.Based on three engines,the way to reduce knocking noise of tensioner at low-speed is studied.The conclusions are as follows:Reducing the oil leakage increases the damping force of the chain tensioner,which can effectively reduce the low speed knocking noise;Increasing the oil intake of the one-way valve and enlarging the oil storage chamber can effectively improve the low speed knocking noise;Increasing the oil pressure of the main oil channel can effectively improve the knocking noise at low speed;Increasing the spring force of the tensioner plunger can effectively improve the knocking noise at startup.This study has a great significance to improve the NVH performance of the whole machine.
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