The axle, together with the engine and gearbox, is called the three power core assemblies of the trailer. Although it is not often mentioned as the engine and gearbox, it plays a role as a link in the process of vehicle power transmission and plays a light and heavy role in the driving power and stability of the vehicle.

The basic function of the trailer axle is to transmit the forces and moments in all directions between the frame (or load-bearing body) and the wheels:

(1) The engine torque transmitted from the universal transmission device is transmitted to the driving wheel through the main reduction tire, differential and half shaft, so as to reduce the speed and increase the torque;

(2) The transmission direction of torque is changed by the bevel gear pair of the main reducer;

(3) The differential action of wheels on both sides is realized through the differential to ensure that the inner and outer wheels turn at different speeds;

(4) Through the transmission of the main reducer gear, reduce the speed and increase the torque;

(5) Through the axle housing and wheels, the bearing and force transfer functions are realized. 

With the rapid development of trailer axle Market in China, the application and R & D of related core production technology will become the focus of enterprises in the industry. Now the automobile industry is generally developing towards energy conservation, environmental protection and comfort, which drives the development of axle towards specialization, lightweight and high efficiency to a certain extent.

(1) Specialization: the axle industry will gradually improve the classification of product type spectrum according to the specific service conditions of vehicles, and provide specific products for market segments;

(2) Lightweight: with the introduction of weight charging and fuel tax policies, lightweight has become the general trend of trailer development. More new materials will be adopted for the axle and the structural design will be optimized;

(3) High efficiency: the production of solid, durable and high mechanical efficiency axles has become the goal of various enterprises. For example, the axles produced by Shandong Darong group can successfully improve the performance such as service strength and durability while reducing the self weight, which can broaden the load-bearing range for users when full load, reduce fuel consumption in no-load season, save energy and increase efficiency;

(4) Wide application of disc brake: disc brake has been widely used in Europe and America, and now it has increasingly become the use trend of domestic transportation industry. The disc axle produced by Darong group adopts integrated alloy brake disc, which is wear-resistant, crack resistant, efficient heat dissipation, convenient maintenance, sensitive braking, stronger stability, and fully conforms to industry standards.

(5) Electronic system assisted braking technology is widely used: ABS system will be gradually extended to trailer industry, and ESP, EBD and other technologies will also be gradually applied.