What does the rear axle assembly of a car mean
The rear axle assembly of a car is a device that connects two rear wheels. Its main functions are to support the wheels, transmit power (drive or support), and disperse road impact. Its structural type depends on the vehicle's drive form: the rear axle of a rear-wheel drive car is a drive axle, which needs to undertake the functions of driving, deceleration and differential. The rear axle of a non-rear-wheel drive vehicle is merely a support axle and is only responsible for bearing loads.
Core composition
Youdaoplaceholder0 Drive axle (rear-wheel drive) : It includes components such as the main reducer, differential, half shaft gear, and half shaft, and is responsible for distributing power to the left and right wheels and achieving differential movement.
Youdaoplaceholder0 Support axle (non-rear-wheel drive vehicles) : Composed only of half shafts, brakes and other components, it mainly undertakes the functions of supporting the vehicle body weight and basic braking.
Classification basis
It is classified into three types according to the suspension type:
Youdaoplaceholder0 Non-independent suspension (such as leaf spring suspension) : Integral axle structure, mostly used in trucks or off-road vehicles
Youdaoplaceholder0 Independent suspension (such as Macpherson) : half-axle structure, mostly used in sedans
Working principle
The engine power is transmitted to the large gear disk (differential) of the rear axle through the transmission. The speed difference between the wheels on both sides during steering is achieved through the gear set inside the differential, and ultimately the wheels are driven to rotate by the half shaft
The rear axle refers to the component of the rear drive shaft that transmits power to a vehicle. It consists of two half Bridges and can perform differential motion on the half Bridges. At the same time, it is also a device used to support the wheels and connect the rear wheels. If the vehicle is driven by the front axle, then the rear axle is merely a follower axle, only serving to carry loads. If the front axle is not a drive axle, then the rear axle is a drive axle. At this time, in addition to the load-bearing function, it also serves to drive, decelerate and differential. If it is four-wheel drive, there is usually a transfer case in front of the rear axle. The rear axle is divided into integral axle and half axle. The entire axle is equipped with non-independent suspensions, such as leaf spring suspensions, while the half axle is equipped with independent suspensions, such as MacPherson suspensions.
If the front axle is not a drive axle, then the rear axle is a drive axle. At this time, in addition to the load-bearing function, it also serves to drive, decelerate and differential. If it is four-wheel drive, there is usually a transfer case in front of the rear axle.
The engine transmits power to the transmission, which is then shifted to the large gear disc on the rear axle. The differential is an integrated unit, and inside it are: The differential has small gear discs at the top and bottom, with a cross column in the middle and two small gears on top (which serve to adjust the speed when turning). It is placed upright, with two small round holes on both sides, and there are slide keys on them. The half column we often talk about is inserted in these holes. When driving in a straight line, the cross column remains stationary, but when turning, the cross column moves to adjust the speed of the tires on both sides To enhance the maneuverability of the car when turning!
The rear axle of the Jiefang brand heavy-duty truck is a drive axle, whose main function is:
The power from the engine, transmitted by the clutch, gearbox and drive shaft, etc. is sent through the reducer to reduce its speed and increase its torque, and then this moment is transmitted to the drive wheels through the half shaft.
Bear the load of the rear axle of the car;
The reaction force and reaction moment of the road surface are transmitted to the frame through leaf springs.
When a car is in motion, the rear wheel brakes play a major braking role, and when it is parked, the rear wheel brakes generate parking braking.
During the use of the vehicle, the mud and dust on the vent plug of the rear axle housing should be frequently removed. It should be removed for cleaning and unblocking every 3,000 kilometers for maintenance to ensure the airway is unobstructed. This is to prevent the airway blockage from causing an increase in pressure inside the axle housing and resulting in oil leakage at the mating surface and oil seal. And check the level and quality of the lubricating oil. Add or replace it if necessary. The gear oil of the new locomotive should be replaced during maintenance at 12,000 kilometers. Thereafter, the oil quality should be checked every 24,000 kilometers of maintenance. If it changes color or becomes thinner, new oil should be replaced. When used in cold regions, winter lubricating oil should be replaced in winter. When maintenance is carried out after driving about 80,000 kilometers, the main reducer and differential assembly should be disassembled, the inner cavity of the bridge housing should be cleaned, and the nuts of each part should be tightened according to the specified torque. The meshing clearance of each gear and the contact marks on the tooth surface should be adjusted.
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