Is a Larger Transmission Gear Ratio Always Better?
1 Answers
Transmission gear ratio refers to the ratio of the number of teeth on the meshing gears in the transmission. A larger gear ratio can make the vehicle shift more smoothly. Moreover, more gears mean a wider range of gear ratios, allowing the engine to maintain lower RPMs at high speeds, thereby achieving fuel efficiency. In addition to smoother shifting and better fuel economy, more gears also help the engine stay at lower RPMs for extended periods, effectively reducing cabin noise and vibration. Key points: 1. The transmission gear ratio is the ratio of the number of teeth on the meshing gears in the transmission. Under the same conditions, a larger final drive ratio results in a lower top speed, while a smaller final drive ratio allows for a higher top speed. 2. The size of the transmission gear ratio is related to vehicle speed—the larger the gear ratio, the faster the vehicle speed. 3. When two gears of different diameters rotate together, the larger gear naturally turns slower than the smaller one. Their speed ratio is inversely proportional to their diameters. The engine's RPM is adjusted by the gear sets in the transmission before being transmitted to the wheels. The transmission contains several gear sets with different ratios, allowing the driver to select the appropriate combination based on speed and load. Shifting while driving essentially means choosing different gear ratio combinations.
