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Automotive leaf spring suspension system is the most traditional automobile elastic element, as well its reliability, simple structure, short process, low cost and can greatly simplify the structure, etc., resulting in a wide range of applications. Automotive leaf spring is generally a combination of several pieces of unequal length alloy spring steel from a group of approximately equal strength spring beams. In addition to the suspension system, acting as a buffer outside, when it disposed longitudinally in the car, and one end of the frame for fixing the hinge connection, you can take in all the transfer of forces and moments, and decided to track motion of the wheel, serves as a guide role, and therefore must be set no other guide means, in addition automobile spring is the superposition of multiple pieces, when the deformation under load, each piece has a relative sliding friction, resulting in some resistance, prompting vibration damping body, and therefore the use of such structures can not install dampers. However, the lowest energy per unit weight of leaf springs saved, the worst result of the utilization of these materials. More generally leaf spring ε = 60%, less leaf spring ε = 75% ~ 85%. Spend a lot of steel, it weighs account vehicle weight 8 to 9%. When installed in an automobile leaf spring suspension, are exposed to a forward vertical loads, each spring pieces are subject to deformation, arch bend upward trend. In this case, axle and frame it close to each other. When the axle and the frame away from each other, the leaf spring forward suffered the vertical load and deformation will be gradually reduced, and sometimes even reversed. The main piece of the Word stress seriously, is weakness, in order to improve the forces the main piece of the Word, often also bent end of the second sheet of the Word, including outside the main piece of the Word, called the package ear. To make each piece of elastic deformation when there is the possibility of sliding between the main piece of the Word and the second sheet aural left a large void. Some leaf spring suspension at both ends of the Word is not made, and the use of other support connections, such as the rubber support pads. Automotive leaf spring divided into two types, one is the traditional leaf springs multi-chip thickness, etc., and the other along the longitudinal direction of the center of the thicker plate is tapered to the ends, or the sheet width and sheet thickness are gradually fewer sheet changes taper leaf spring (1 to 4). Small piece taper leaf spring, in addition to reduce the dry friction between the film and the film and the noise it produces, it also can save materials, reduce body weight, reduce fuel consumption, reduce the dynamic stiffness, increase the use of stress, fatigue life , and has a good ride and comfort. Small piece taper leaf spring just follow cargo class car "heavy, gentrification, electronic," the international development trend, the mainstream development of China's automobile spring market, has broad market prospects and great potential.