What is the lifespan of a half-shaft in kilometers?
2 Answers
The lifespan of a half-shaft is generally over 10 years. Below is relevant information about half-shafts: 1. Introduction to half-shafts: In automobiles, a half-shaft typically refers to the drive axle, which is the mechanism located at the end of the drivetrain that alters the speed and torque from the transmission and transmits them to the drive wheels. The drive axle is usually composed of the main reducer, differential, wheel drive mechanism, and drive axle housing. For steering drive axles, constant velocity universal joints are also included. 2. Function of half-shafts: The drive axle is at the end of the power transmission system, and its basic functions are: transmitting the engine torque from the universal joint drive to the drive wheels through the main reducer, differential, and half-shaft, achieving speed reduction and torque increase; changing the direction of torque transmission via the bevel gears of the main reducer; enabling differential action between the two wheels through the differential to ensure the inner and outer wheels turn at different speeds; and supporting loads and transmitting torque through the axle housing and wheels.
Well, after fixing cars for so many years, I think the lifespan of a half-shaft really doesn't have a fixed number. Talking about mileage is actually too vague. Normally, it can last 150,000 to 200,000 kilometers, but it depends on how you drive and the road conditions. For example, some cars I've inspected that frequently run on rural dirt roads start squeaking at just 80,000 kilometers because the dust cover is torn, the lubricant leaks out, and the bearings are worn terribly. SUVs and four-wheel-drive vehicles are worse—too much off-roading can cause them to fail prematurely. During maintenance, don’t forget to lubricate the drivetrain and listen for unusual noises—if there’s any squeaking, replace it immediately without delay. If ignored, it can affect the differential and lead to costly repairs. In short, drive gently, avoid slamming the accelerator or carrying heavy loads, and this thing will last longer.
