Semi-trailer landing gears are commonly known as landing gears, which are divided into left and right. As an indispensable part of semi-trailers, the commonly used landing gears generally have a stroke of about 45 cm, a closed height of about 90 cm, a rated load of 28 tons, and a static load of 40 tons. They all support the semi-trailer after the semi-trailer is separated from the front of the car, but the styles and types are different. Let's take a closer look.

1、Single-acting landing gears:

There is a gear box on both sides of this type of trailer landing gear, which can be divided into two types: built-in and external. Through two cranks, they can be raised and lowered independently. There are two gears: high and low speed. The load must use a low-speed gear. This type is the most basic traditional trailer landing gear. It has strong adaptability and can be used on both flat and uneven ground.

2、Linked landing gears:

This type of trailer landing gear has only one gear box. By means of a crank, the left and right landing gears can be controlled to rise and fall at the same time. It is also divided into two gears, high and low speed. It is an upgraded version of the most basic traditional trailer landing gear. Compared with the single-action trailer landing gear , the lifting efficiency is doubled, but this kind of trailer landing gear is only suitable for flat road surface, and it can only be used when the cushion block keeps the supporting surface basically level when the road surface is uneven.

3、Aluminum alloy landing gears:

This type of trailer landing gear is a product that should be lightweight, with a self-weight of about 30-40KG. Most of them are single-action type. The function is basically the same as that of the single-action trailer landing gear. However, many old drivers report that the use effect is not very satisfactory. Insufficient strength and easy damage, it is suitable for models that do not often take off, and the main highlight is that it is nearly half of its own weight lighter than traditional landing gears.

Aluminum alloy landing gears

4、Hydraulic landing gears:

This type of trailer landing gear is an upgraded replacement product of the traditional trailer landing gear, and it is also an innovative application of electromechanical-hydraulic integration in the trailer industry. This trailer landing gear can be said to be an integrated micro-hydraulic system as a whole. After the rated pressure, the direction of the oil circuit is controlled by the solenoid valve on and off, so that the oil cylinder can be extended or retracted individually or at the same time, that is, the lifting and lowering of the landing gears.

Hydraulic landing gears

This trailer landing gear has a high degree of automation. Within the effective stroke of the oil cylinder, the trailer landing gear can be automatically balanced, which is suitable for various road conditions. The tonnage support force is suitable for high-frequency drop-and-hang transportation in pursuit of high efficiency, but the self-weight is heavier, and the cost is about 5 times that of ordinary landing gears. In addition, there are fewer maintenance points at present, and the later maintenance costs are relatively high, resulting in less current market applications. 

5、Pneumatic landing gears:

This type of trailer landing gear is adjusted to the rated air pressure by the automatic pressure-regulating relief valve through the pressure generated in the vehicle-mounted gas cylinder, and the pneumatic solenoid valve is turned on and off to control the direction of the air path, and control the cylinder hidden in the trailer landing gear to expand and contract individually or at the same time. , that is, to realize the lifting and lowering of the landing gears.

Pneumatic landing gears

This trailer landing gear is similar to the hydraulic trailer landing gear, which saves the crank handle and gear transmission mechanism, and has a high degree of automation. Within the effective stroke of the cylinder, the trailer landing gear can also achieve automatic balance, which is suitable for various road conditions. Operation, no traditional crank handle is required, high lifting efficiency, and it is also suitable for efficient drop-and-hang transportation.Compared with hydraulic landing gears, its dead weight is lighter, and there is no need to worry about oil leakage. At present, due to fewer maintenance points, it is still faced with the same problems as hydraulic landing gears. same question.

6、Pneumatic-hydraulic combined landing gears:

This kind of trailer landing gear is based on the above principles of hydraulic and pneumatic landing gears. By using the high speed of the pneumatic trailer landing gear when it is no-load and the stability of the hydraulic trailer landing gear when it is loaded and lifted, the two are perfectly combined, and the lifting efficiency during operation is improved. will be higher. However, before mass production is popularized, if the technology is immature and the structure is more complex, the probability of failure will increase. Without the guidance of industry standards and policy norms, it will also face the embarrassing situation of the above hydraulic and pneumatic landing gears.

Pneumatic-hydraulic combined landing gears

However, from the trailer parts, it is not difficult to see that traditional semi-trailers are undergoing a transformation from manufacturing to intelligent manufacturing. This transformation is conducive to gradually improving the automation and intelligence level of semi-trailers and ensuring operation. Safety, improve efficiency and product quality, and even enhance the overall competitiveness of the entire logistics industry.

CIMC Intermodal Equilink Co., Ltd provides a full range of trailer parts such as trailer rims, trailer landing gear, trailer brake drum, trailer axle etc. CIMC Equilink has a professional vehicle parts product team. If you have any inquiries about trailer parts , please email us(Email: info.equilink@cimc.com), and you can also log in to our company website http://www.cimc-equilink.com for more information.