What are the gears in an automatic transmission?

[DePenelope]

Here is a detailed introduction to the gears in an automatic transmission: 1. R (Reverse) gear: When this gear is engaged, it connects the hydraulic system to the reverse gear circuit, causing the drive wheels to rotate in reverse for backward movement. Never force the shift into "R" gear when the vehicle is not completely stopped, as this may damage the transmission. 2. N (Neutral) gear: When neutral is engaged, the planetary gear system idles without power output. 3. D (Drive) gear: When the gear selector is in this position, the hydraulic control system automatically connects the appropriate forward gear circuit based on throttle opening and vehicle speed signals. It can automatically shift up or down according to driving speed, achieving automatic transmission functionality. 4. P (Park) gear: This uses a mechanical device to lock the rotating parts of the car's wheels, preventing the vehicle from moving.

[BrandonLynn]

Automatic transmission cars generally have several common gear positions. The P (Park) gear is used when parking, mainly to lock the wheels and prevent the car from rolling, suitable for parking and turning off the engine. The R (Reverse) gear is for backing up, essential for reverse parking. The N (Neutral) gear is the neutral position, ideal for brief stops like waiting at a traffic light. The D (Drive) gear is the most commonly used forward gear; when driving in this gear, the car automatically shifts based on speed, making it hassle-free and convenient. There are also many variant gear positions, such as the S (Sport) mode for a more powerful drive but with higher fuel consumption, and the L (Low) gear for controlling speed when going down long slopes to prevent brake overheating and damage. For everyday driving, the D gear is sufficient, but remember to press the brake and come to a complete stop before shifting gears to avoid damaging the transmission. Overall, gear positions are designed for safety and convenience, and understanding them makes driving an automatic car smoother and more enjoyable.