1.Automotive spring
 

Automotive spring is the most traditional elastic element in automotive suspension system. It is widely used because of its advantages of good reliability, simple structure, short manufacturing process, low cost and greatly simplified structure. Automotive plate springs are generally composed of several pieces of alloy spring steel of varying lengths to form a set of approximately equal strength spring beams. The leaf spring of Iveco chassis is divided into two forms of multi-blade spring and less blade spring, the multi-blade spring is seven, and the less blade spring is three, relatively speaking, the load-carrying capacity of the multi-blade spring is stronger, and the comfort of the less blade spring is better. The six emission IVeco Osun is less spring structure.
2.Air suspension system


Air suspension is a kind of automobile suspension, which is mainly composed of control computers, sensors, pipelines, air pumps and air bags. Generally speaking, the model equipped with air adjustable suspension is equipped with ground distance sensors near the front and rear wheels. According to the output signal of the ground distance sensor, the driving computer will determine the height change of the body, and then control the air compressor and exhaust valve, so that the spring automatically compresses or extends, thereby reducing or raising the ground clearance of the chassis. To increase the stability of high-speed body or complex road conditions.
The difference between automobile plate spring and air suspension
The air suspension spring has nonlinear elastic characteristics, and its characteristic curve can be designed into an ideal shape. Air suspension can adjust comfort, body clearance and more. Comparisons can be made from the following aspects:
Safety
1, the automobile leaf spring due to the simple structure, uniform force, under the premise of no overload, the probability of failure is very low.
2, the air suspension can make the tire and the ground as far as possible to maintain pure rolling contact, basically achieve the best braking effect; The effective braking power is increased and the braking distance is shortened.
3, the air spring suspension system takes into account the safety of the system, in emergency situations, such as air bag rupture, pipeline leakage, air spring suspension system can ensure that the frame is stable in the buffer belt inside the air bag, or the axle top to the limit fast, the vehicle is driven to the maintenance station for repair at low speed. Comparison results: Air spring suspension is safer than leaf spring suspension.
Reliability
1, the leaf spring because of the simple structure, the failure rate is very low.
2, air suspension due to more parts, complex working principle, the failure rate will be higher. Comparison results: the reliability of leaf spring suspension is higher than that of air spring suspension.
Economy
1. The automobile air suspension system may effectively reduce the vibration of the body, improve the reliability of the vehicle, greatly reduce the failure rate of the vehicle electrical system, extend the service life of the tires and brake pads, reduce the maintenance technology of the electrical, air conditioning, exhaust system, axle, body and chassis, and extend the service life of the vehicle.
2. The price of air suspension is much higher than that of leaf springs, which will lead to an increase in vehicle acquisition costs.
3. The maintenance cost of the air suspension system in the later use process will be higher than the leaf spring. Comparison results: The acquisition cost of leaf spring is higher than that of air suspension, and the use cost is relatively low.
Comfort
1. When the spring of the leaf spring suspension changes in the load mass, the natural vibration frequency of the vehicle system will change greatly. The offset frequency of the leaf spring is about 1.7-2.3Hz when it is fully loaded, and it is larger when it is unloaded, so the overall comfort is poor.
2, the air suspension has a typical nonlinear stiffness, the cushioning effect of vibration and shock is obvious, the test data show that: under the same state, the impact force of the air spring system vehicle on the road surface is reduced by about 1/3-1/2 than that of the leaf spring suspension vehicle.
3, the offset frequency of air suspension is about 1.35Hz (1.0Hz-1.5Hz range), so the air suspension can effectively isolate the vibration of the vehicle from the ground, and the vehicle equipped with air suspension has good curve passing (that is, the speed of turning can be higher than that of the leaf spring vehicle), and the braking distance is shorter (the braking force is evenly distributed). Large effective braking power), the rearview mirror image is clearer and more stable, the driver is more comfortable, not easy to fatigue, and the spirit is more concentrated.
4, the air spring suspension system under the action of the height valve, the vehicle load changes when the height of the body basically remains unchanged, the frequency offset changes less, so as to ensure the comfort under no-load. The system with lifting valve is installed to realize the height of the vehicle body can be adjusted within a certain range, so as to meet different loading and unloading requirements, and improve the passability of the vehicle. Comparison results: the comfort of air spring suspension is about 30% higher than that of leaf spring suspension.

The air suspension is more comfortable and the leaf spring is more reliable. So whether there is a way between the two can have both fish and bear PAWS? The answer is that auxiliary air suspension can be used. That is, the air suspension system is installed on the basis of the leaf spring, both the reliability of the leaf spring and the comfort of the air suspension