What is the rear axle of a car
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.
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.
The rear axle of a car is one of the core components of the vehicle chassis. Its functions can be classified into the following categories based on different drive forms:
Power transmission and drive function
In rear-wheel drive or all-wheel drive vehicles, the rear axle serves as a drive axle , responsible for distributing the power transmitted by the engine through the transmission to the left and right rear wheels via reduction gears and differentials. The differential regulates the speed difference between the inner and outer wheels during turning through planetary gears, enhancing the stability of the turn.
For front-wheel drive vehicles, the rear axle only serves as a follower axle , does not participate in driving, and mainly undertakes a supporting role.
Load-bearing and load distribution
The rear axle directly bears the weight of the rear of the vehicle (such as the load of a truck or the rear seat load of a passenger car), and transmits the load to the frame through the suspension system (such as leaf springs or independent suspension) to ensure the balance of the vehicle body.
Deceleration and differential function
The drive type rear axle is equipped with a reduction gear , which reduces the speed and increases the torque to meet the requirements of the wheels. The differential mechanism allows the left and right wheels to rotate at different speeds when turning, preventing tire slippage or wear.
Driving stability and buffering
The rear axle structure (such as the hollow axle housing and drive shaft design) can absorb road impact and reduce the vibration transmitted from bumps to the vehicle body. When braking, the rear axle works in coordination with the braking system to enhance vehicle stability.
Maintenance and durability
High-quality rear axles (such as Qingte rear axles) are made of high-strength materials and designed with a long maintenance cycle, reducing maintenance frequency. Regular inspection of the lubricating oil, gear condition and sealing performance can extend their service life.
Supplementary Explanation
The rear axle of a four-wheel drive vehicle is usually equipped with a transfer case to dynamically distribute power between the front and rear axles. Youdaoplaceholder0 heavy-duty trucks may adopt a multi-axle design, distinguishing between drive axles and non-drive support axles to optimize load-carrying capacity.
In conclusion, the rear axle is a key component that ensures the power transmission, handling stability and load capacity of a vehicle. Its specific functions vary depending on the drive layout and vehicle model.
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