Suspension, also known as suspension, is the general term for all force transmission connection devices between the semi-trailer Frame and axle. It is used to transmit the force and torque acting between the wheels and the frame, and the buffer is transmitted from the road to the frame. Or the impact force of the car body, and reduce the resulting vibration to ensure that the car can drive smoothly.
Generally speaking, the suspension of semi-trailers can be divided into four main types:
- Rigid suspension.
The body chassis of the rigid suspension acts directly on the axle between the wheels, without springs as buffers. When the road surface is uneven, it completely relies on the swing of the balance beam to maintain the relative balance of the front and rear axles.
This kind of suspension is relatively rare at present because its shock absorption effect is very poor. It is mainly used on low-bed semi-trailers that carry cargo at low speeds.
- Steel plate suspension.
Also known as tandem leaf spring balance suspension, it is also a common leaf spring suspension, which is mainly composed of leaf springs, suspension supports, connecting rods, U-bolts, etc.
The biggest advantages of this kind of trailer suspension are low cost, reliable operation and easy maintenance. Because of this, steel plate suspension is currently used in the largest proportion of domestic semi-trailers, about 70-80%.
- Single point suspension.
That is to say, the common front and rear brackets of leaf springs are reduced to a single bracket and connected to the vehicle body. The stress points can be equally divided into different axles, so the load-bearing capacity is larger, and it is generally used on heavy-duty trailers.
- Air suspension.
Also called airbag suspension, its most significant feature is the airbag air spring. Compared with other suspensions, air suspension has better buffering force, which can effectively protect cargo and improve driving comfort. It is currently mainly used. In the transportation of precision instruments, hazardous chemicals, etc.
