Subaru four-wheel drive system can be divided into several models and specifications of four-wheel drive systems with different levels of ACT4, VTD and DCCD. Among them, DCCD is the most all-day four-wheel drive system of Subaru Group, and it is also the material of rally. The differential limit of the front and rear wheels can be changed automatically or at will. VTD is Subaru's four-wheel drive system, showing the characteristics of fitness. It can distribute the driving force of the front and rear wheels, but the intensity is not as high as DCCD, which is suitable for the sports style of violent driving.
It consists of central differential of planetary gear set, multi-disc clutch of motor-controlled hydraulic press and central differential. Under normal circumstances, the torque distributed to the rear tire is more than that of the front tire, and the driving dynamics of the car has the characteristics of front and rear driving. ACT4 is Subaru's novice four-wheel drive system, which is equipped with a motor-controlled multi-plate clutch central differential at the rear section of the transmission to drive the front and rear wheels.
In addition, it can also ensure the stability and reliability when moving on the ground with low sliding friction such as runway and snow. However, ACT4 has no running system software with racing characteristics like DCCD or VTD. ACT4 is the version number of an ordinary off-road vehicle.
In addition, Acura Four-wheel Drive (SH-AWD) is one of the Japanese four-wheel drives that have been done well. How powerful is the SH-AWD four-wheel drive? SH-AWD is mainly used for running roads, but it is different from the general four-wheel drive system. SH-AWD not only has a differential, but also has no transfer case and differential lock. It just uses a simple driver to divide the torque of the front, rear, left and right axles into 3:7, but the key strength of Acura's SH-AWD four-wheel drive system lies in the rear axle structure.
SH-AWD relies on the hydraulic power unit of automobile rear axle, which is composed of a group of planetary gear sets and multiple clutches. The rear axle is provided with a speed-increasing device, and there are two clutches in the speed-increasing device, one bearing fast rotation speed and the other bearing low rotation speed, and a group of planetary gears are connected in the fast rotation speed clutch. When the car turns quickly, the planetary gear can increase the number of revolutions of the rear axle of the car to 105% to make up for the lack of steering when turning.
Moreover, the planetary gear set can greatly reduce the clutch pressure, and it is not easy to have the problem of over-temperature maintenance of clutches in other four-wheel drive systems, so it also reflects the high stability of SH-AWD four-wheel drive, and the Acura SH-AWD four-wheel drive system is also called the most timely four-wheel drive.
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