Little piece variable cross-section spring
(1) starting from the energy point of view, and strive to make the car lightweight as automobile spring assembly due to larger self, accounting for vehicle weight of 8 to 9%, automotive lightweight components can not be ignored. To reduce the dead weight of the car to improve the car's ride comfort, and to improve the performance of the vehicle, in recent years, automotive leaf spring design lightweight towards the development of a small piece of variable cross-section spring.
Small-chip variable cross-section spring is composed by one or a few slices of the longitudinal length of the variable cross-section spring, usually 2 to 3, up to no more than five.
(2) less chip advantages of variable cross-section spring:
①, light weight
a. reduce the focus 30 to 40%, compared with the multi-leaf spring using a reasonable cross-sectional shapes, as compared with a number of leaf springs closer stress beam, the stress distribution is more rational, the highest material utilization ε = 75 ~ 85% .
b. improve the design stress, design stress can be increased by 20% than the multi-leaf spring (design stress increased by 10%, the weight can be reduced by 20%), and significantly reduce the weight of the spring.
c non-working part of the small, less leaf spring in central clamping length is smaller than the multi-leaf spring.
②, improved suspension performance
a number of pieces less chip friction between the resistance is relatively stable.
b. stiffness increased small.
③, it is possible to improve the life of the automobile spring
a. using advanced intensive stress peening.
Prestressing stress peening applied the following ways:
A. 100kg/cm2 B, 120 kg/cm2 C, 140 kg/cm2
If prestress 120 kg/cm2, the residual compressive stress-b5 to -90 kg/cm2.
b spraying anti-corrosion layer
c between the sheet plus pad, to prevent contact between the sheet and reduce the friction between the sheet.
④, reduces the processing workload of the automobile spring.
⑤, reduce the total thickness of the spring assembly, the center of gravity of the vehicle height reduced general arrangement good layout.