How to distinguish the same section of multiple spring and variable section of less spring?

The shape of the common leaf spring on the truck is mostly symmetrical section structure, which is generally composed of a number of spring steel pieces with different lengths, different curvature radius and equal or different thickness, and forms an elastic beam of similar strength. Because the number of spring steel plates is different and the section structure is different, we also divide them into multiple spring springs of equal section and less spring springs of variable section.

So what is the constant section of multi-blade spring, what is the variable section of less blade spring? Friends who often drive trucks are no strangers.

Multiple spring of equal section: composed of multiple pieces of steel with different lengths and the same width and thickness. The plates of multiple leaf springs are stacked into an inverted triangle shape, with the longest steel plate at the top and the shortest steel plate at the bottom. The number of plates is related to the weight of the supporting passenger car. The more the thicker and shorter the plate, the greater the rigidity of the spring. Because of the same section, it is also known as the constant section multi-blade spring. The spring assembly section is trapezoid, the number of pieces, the weight is large.

The advantages and disadvantages of equal section spring: it is relatively simple in structure and lower in cost than other kinds of spring, but with the growth of the use of time, the plates will produce sliding friction between each other, resulting in a certain noise, friction will also cause the deformation of the spring, affecting the smooth running of the vehicle.

Variable section less spring: in order to lightweight, the car uses a new spring steel plate structure, that is, the middle section of the single spring is the thickest, gradually thinning to both ends, not equal section steel plate. The characteristics of a piece of steel plate is equivalent to the characteristics of a few pieces of equal section steel plate, therefore, the number of pieces of the leaf spring assembly is reduced, and each spring is a variable section spring, the number of pieces of the leaf spring assembly can be reduced to 2-3 pieces, and the performance of the past 6-8 pieces. This leaf spring is called a spring. The characteristics of less spring are: single spring section is not equal, thick in the middle, thin at both ends; Fewer pieces of assembly, light weight.

The advantages and disadvantages of variable section fewer spring:

Compared with multiple spring, under the condition of the same stiffness (that is, the same bearing capacity), fewer spring is about 50% lighter than multiple spring, which reduces fuel consumption, increases ride comfort and meets the requirements of automobile lightweight. And there is less point contact between the single spring, which reduces the relative friction and vibration, and increases the ride comfort. However, less spring has higher requirements for processing section technology, and the manufacturing cost is higher than that of more spring.