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What Are the Causes of Gear Noise in Automobiles?

2 Answers

VanJuliana

07/24/25 10:12pm

Introduction to the causes of gear noise in automobiles: 1. Excessive surface roughness of gears. When the gear surface is too rough, the friction area during interaction is larger, leading to higher vibration frequency and consequently louder and more frequent noise. 2. Insufficient overlap ratio. Gears undergo varying degrees of deformation when transmitting loads. At the moments of gear engagement and disengagement, meshing impact forces are generated along the gear meshing line, causing certain torsional vibration noise in gear transmission. Therefore, an insufficient overlap ratio can lead to gear noise. 3. Gear design issues. Inappropriate selection of gear parameters, improper or lack of gear modification, and unreasonable gearbox structure can all result in excessive gear noise. 4. Gear precision. Low gear contact precision, insufficient rotational precision of bearings, and improper clearance can cause excessive gear noise. The precision of gear pitch, tooth profile, and radial runout of the gear ring all affect gear noise to some extent. Higher precision results in less noise.

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DeAriana

08/10/25 2:56pm

I've experienced gear noise issues quite a few times. The main cause is severe wear on the gears themselves, especially common in decades-old vehicles - when gear teeth become flattened or develop fine cracks, you'll hear that clattering sound while driving. Lubrication problems are another major factor; insufficient, dirty, or degraded oil leads to dry friction between gears causing constant noise. I remember one car from my youth that made terrible noises, which turned out to be due to incorrect oil viscosity. Assembly errors also contribute, like improper gear clearance (too large or too small) or misalignment, making the noise more pronounced during turns or acceleration. Driving habits matter too - frequent sudden starts and stops accelerate gear wear. Never ignore such sounds - prompt comprehensive inspection at a repair shop saves both trouble and money. Delaying repairs only increases costs and safety risks. Regular fluid checks every 5,000 km can effectively prevent these issues.

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