The leaf spring is a light few leaf variable cross-section spring, which is optimized from multiple heavy springs. Compared with multiple leaf springs, this leaf spring greatly reduces its own weight, thus reducing the load of the frame. Due to its simple structure and large gap between the leaf springs, the friction is reduced, the service life is improved, and the noise is significantly reduced. The biggest advantage of light spring is that it only needs 3 to 4 pieces to achieve the performance of equal section 8 to 9 pieces of spring, which significantly reduces the cost and reduces the waste of resources. The specification of the whole set of raw materials for the leaf spring is 90 × 30. The material is Sup9. The length of the first piece is 1826, the length of the second piece is 1832, and the third piece is 1850. The arc height of the assembly is 150 ± 6, and the center hole is φ16.5. The product is suitable for Scania trucks, mainly in Southeast Asia and Europe.
Basically a parabolic spring is a spring that consists of two or more leaves. The leaves touch only in the center, where they are fixed to the axle and at the outer ends, where they are fixed to the vehicle. In between those two points the leaves do not touch each other as they do with conventional leaf springs.
Each leaf represents a complete spring in its self and will act as such. To enable the leaf spring is tapered, from the center (thick) to the outer ends (thin). This tapering is parabolic, it means that every centimeter (or inch) the thickness of the leaf decreases in an amount that relates to the square function of it's length.
This may sound complicated but in fact it is very simple. Every single leaf will have, more or less, the shape of a complete multi leaf spring and thus it's capable to cope with the same forces. This means that the ideal parabolic spring could have only one leaf, however, this type of "mono leaf" spring will have very limited articulation/weight ratio due to high internal stresses so a 2 or 3 leaf parabolic spring can divide the stresses more evenly across the other leaves and thus more axle movement is possible. That is why we designed 2 and 3 leaf springs. An other reason to increase the number of leaves on a parabolic spring is to increase the rate (load capacity). Because every leaf is one spring we can add or take out leaves without compromising the strength of the leaf it self. So for example we have a 3 leaf rear spring and we add one similar leaf the rate will go up for about 30% which means that the load capacity increases by +/- 30% (depending on the shackle effect)
Composition of leaf spring:
Roll the ear structure
The main plate of automobile leaf spring is mostly made into a roll ear shape to connect with the car body. The basic shape of the roll ear is divided into three kinds: upper roll ear, lower roll ear and Berlin ear.
(1) The most commonly used ear is the upper roll;
(2) The use of lower roll ear is the reason for the layout. Such as coordinate leaf spring and steering rod system movement trajectory. The lower lug is easy to open under load and can be supported by a second pack.
(3) In order to improve the stress state or coordinate the motion track of the coiling ear, especially for the large rubber bushing coiling ear, the flat coiling ear structure is adopted.
|1) Raw matrail .|
|Thickness less than 20mm. We use material SUP9|
|Thickness from 20-30mm.We use material 50CRVA|
|Thickness more than 30mm. We use material 51CRV4|
|Thickness more than 50mm. We choose 52CrMoV4 as the raw material|
|2) Quchenging Process|
|We strickly controled the steel temeprure around 800 degree.|
|we swing the spring in the qenching oil among 10 seconds according to the spring thickness.|
|Each assmembing spring set under stress peening .|
|Fatigue test can reach over 150000 cycus|
|4) Electrophoretic paint|
|Each item use electrophoretic paint|
|Salt spray testing reach 500hours|
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