ross Assembly, is part of the power transfer to realize variable Angle, used to need to 
change the location of the drive axis direction, it is the universal transmission device 
of car driving system of the "joint" part. Universal joint and combination of 
transmission, known as the universal joint transmission device. On the front engine rear 
wheel drive vehicles, universal transmission device installed in the gearbox output shaft 
and drive axle of the main reducer input shaft between; And front engine front-wheel drive 
vehicles omit the transmission shaft, universal joint is installed in the steering system 
is responsible for driving and responsible for between front axle and half axle and the 
wheel.
​