What Shaft is the Transmission Gear Shaft?
2 Answers
Transmission gear shafts are the primary shaft and the secondary shaft. The primary shaft is the transmission input shaft, connected to the splined hole of the clutch driven plate; the secondary shaft is the transmission output shaft, connected to the drivetrain leading to the drive wheels. Meaning of Transmission: The transmission is a very important component in a vehicle, capable of changing the gear ratio and expanding the torque and speed effect on the drive wheels. Transmissions are further divided into manual transmissions and automatic transmissions. Composition of Transmission: Manual transmissions mainly consist of gears and shafts, achieving speed and torque variation through different gear combinations; whereas automatic transmissions (AT) are composed of a torque converter, planetary gears, and a hydraulic control system, achieving speed and torque variation through hydraulic transmission and gear combinations.
I often take apart transmissions for fun. Those metal rods inside are the gear shafts, mainly of three types: the one connected to the engine is called the input shaft, which brings in the power; the countershaft has several gears rotating back and forth for shifting gears and changing speed; the last one is the output shaft, directly connected to the driveshaft to deliver power to the wheels. These three shafts work together with the gear sets to allow the car to shift gears smoothly while driving. Last time I was repairing a car, I encountered a case where the reverse shaft was broken, and the car wouldn't move at all—replacing it with a new shaft fixed the issue. These shafts require extremely high hardness, otherwise they can't withstand the engine's power.
