What does the transmission gear ratio table mean?

[EzraLee]

Transmission gear ratio table refers to the gear transmission ratio of the main reducer in the automobile drive axle, which is equal to the ratio of the rotational angular velocity of the drive shaft to the rotational angular velocity of the axle half-shaft, and also equal to the ratio of their rotational speeds. Automobile transmission ratio, also known as gear ratio, refers to the ratio of the rotational speeds of the two transmission mechanisms before and after the transmission device in the automobile transmission system. There are two types of transmission ratios in the automobile transmission system, namely the gear ratio of the main reducer and the gear ratio of the transmission. The maximum transmission ratio of the automobile transmission is the total transmission ratio of the transmission system when the automobile is in first gear. Since the transmission ratio of the main reducer is fixed, and usually the automobile does not have a transfer case or wheel-side reducer, it is only necessary to determine the first gear transmission ratio. If the transmission ratio of the automobile transmission is too small, the automobile will work under heavy load, with poor acceleration performance, and noise and vibration may occur. If the transmission ratio of the automobile transmission is too large, the fuel economy will be poor, and the engine noise at high speed will be loud. In daily use of the transmission, the following points should be noted: Do not fail to change the transmission oil for a long time. Long-term failure to change the transmission oil will cause damage to bearings, housing, and other components in the transmission; Avoid prolonged coasting in neutral. When driving a manual transmission model, many "experienced drivers" will use the operation of coasting in neutral, but for automatic transmission models, coasting in neutral will cause the automatic transmission to overheat, and a certain impact will occur when shifting back to D gear; Do not shift into D/R gear before the vehicle comes to a complete stop. Many drivers, in order to show their "smooth" operation, will directly shift into reverse gear before the vehicle comes to a complete stop, which will cause high damage to the gears in the transmission, and over time, it may lead to gear grinding and other faults; Do not frequently climb steep slopes in D gear. When facing some steep slopes, automatic transmission vehicles often overheat due to high load or shift up too early, resulting in insufficient climbing power. In this case, the manual mode can be used to limit the low gear or the sports mode to protect the transmission; Do not tow the vehicle over long distances. When an automatic transmission vehicle breaks down, a flatbed tow truck should be used to move the vehicle onto the tow board when it is in N gear, and towing ropes or other methods should not be used to directly tow the vehicle.