What Causes Transmission Whine?
2 Answers
Transmission whine occurs due to excessive meshing clearance in the transmission. When the driving gear rotates and impacts the driven gear, it produces a knocking sound, which typically worsens as the transmission temperature rises. Here is relevant information: 1. Transmission: A transmission is a device that changes speed ratios and motion direction. Used in automobiles, tractors, ships, machine tools, and various machinery, it alters the torque, speed, and motion direction transmitted from the driving shaft to the driven shaft under different working conditions. Gear-driven transmissions generally consist of a housing and several gears. 2. Function: The main functions of a transmission are to change the vehicle's driving force and speed (shifting) while maintaining constant engine speed and torque; to allow the vehicle to move in reverse (reversing); and to enable the engine to idle without stalling (neutral).
I used to drive an old car, and the transmission always made a sharp screeching noise when shifting gears, which drove me crazy. Later, I took it to the repair shop for inspection, and the mechanic said it was due to worn bearings or increased gaps between the gears, causing more friction and noise. Insufficient or deteriorated transmission fluid can also lead to this issue, as poor lubrication makes the parts squeak like they're grinding dry. If left unrepaired for a long time, the noise would worsen and could even lead to more expensive failures, such as complete transmission breakdown. Now, I change the fluid every six months and avoid sudden acceleration or overloading during daily driving to keep the transmission working smoothly, which helps minimize minor issues.
