36/6/2 Spring Germany durovis Model 36/6/2 Price

36/6/2 springs are commonly used in wheeled vehicle suspensions. Initially called laminated or bracket springs, and sometimes semi-elliptical or cart springs, they are one of the oldest forms of springs, dating back to the Middle Ages. A leaf spring is a long, arc-shaped spring steel strip with a rectangular cross-section. In the most common configuration, the center of the arc provides the axle location, while the eyes formed at either end attach to the vehicle chassis. For very heavy vehicles, leaf springs can be made from multiple leaves stacked together, typically with progressively shorter lengths. Leaf springs can be used for positioning, a degree of damping, and spring function. Although interleaf friction provides damping, it is poorly controlled and results in static friction during suspension movement. For this reason, some manufacturers have begun using mono-leaf springs. Leaf springs can be connected directly to the frame at both ends, or directly at one end (usually the front), with the other end connected via a shackle or short swing arm. The tension strap counteracts the tendency of the leaves to elongate under compression, thereby making the spring rate softer. Some springs terminate in a recessed end, called a spoon end (rarely used), designed to support rotating components.

36/6/2 Spring Principle

When a leaf spring is installed in an automotive suspension and subjected to a positive vertical load, all spring leaves deform and tend to arch upward. At this time, the axle and frame move closer together. When the axle and frame move apart, the positive vertical load and deformation on the leaf spring gradually decrease, and may even reverse. The eye of the main leaf is heavily stressed and is a weak point. To improve the stress condition of the main leaf eye, the end of the second leaf is often bent into an eye that wraps around the outside of the main leaf eye, known as a wrap eye. A larger gap is left between the main leaf eye and the second leaf's wrap eye to allow for relative sliding during elastic deformation. In some suspensions, the ends of the leaf spring are not formed into eyes but use other support connections, such as rubber support pads. Flat, rectangular steel plates are curved and stacked to form chassis springs. One end is mounted to a hanger with a pin, and the other end is connected to the main beam with a shackle, allowing the spring to expand and contract. This design is suitable for medium and large trucks. Automotive leaf springs are critically important. As is well known, leaf springs consist of many steel leaves that are elastic, uniform in width and thickness, but vary in length. Their function is to connect the frame and axle in a suspended arrangement, exposed between the frame and axle, to bear the load impact from the wheels on the frame, reduce severe vehicle body vibration, and maintain driving stability and adaptability to different road conditions. When bearing load impacts, leaf springs undergo extension motion, causing intense friction between the steel leaves, i.e., compression and tension phenomena. The two friction surfaces generate motion friction forces in opposite directions, causing the leaf spring temperature to rise, resulting in surface scoring and fine cracks. As the frequency of load impact increases, the frictional force generated by the extension motion also increases. When the stress concentration point reaches the fatigue limit, it causes single-leaf or entire stack fracture. Kinetic motion principles and tests prove that for a steel component undergoing compression-extension motion, increased motion frequency raises the component's temperature and reduces its strength. Cracks appear at stress concentration points, gradually expanding and deepening until failure occurs at the fatigue limit. Leaf springs behave similarly, though they possess higher elasticity and are more durable than general steel components. Apart from other causes, the primary cause of leaf spring fracture is poor lubrication. Drivers and technical management personnel should attach importance to this and perform timely leaf spring lubrication. This reduces friction and disperses stress to prevent surface scoring of the steel leaves; reduces intrusion of dust, dirt, and water to prevent corrosion; and dissipates heat to prevent a decline in elastic strength. The general lubrication method is as follows: Lubrication should be performed after the new vehicle break-in period ends, and during use in summer and winter. For lubrication, first remove the leaf spring, open the center bolt to separate the steel leaves, then evenly apply lithium-based or graphite grease to both sides of the leaves. After reassembly, an oil film forms between the two friction surfaces (completing the lubrication of one set of leaf springs takes only as much time as replacing one broken leaf).

36/6/2 Spring Advantages and Classification

The advantages of leaf springs are simple structure, reliable operation, low cost, and easy maintenance. They serve as both the elastic element and the guiding device of the suspension. One end is hinged to the frame, allowing transmission of various forces and torques, and determining the wheel's jump trajectory. Simultaneously, they provide a certain amount of frictional shock absorption. Achieving three functions at once, they are widely used in non-independent suspensions. Leaf springs are classified by shape: 1) Elliptical leaf springs; 2) Semi-elliptical leaf springs; 3) Quarter-elliptical leaf springs; 4) Flat springs. Elliptical, semi-elliptical, and quarter-elliptical leaf springs are composite leaf springs that rely on friction between leaves to provide high buffering and vibration damping performance, widely used in the suspension systems of automobiles, tractors, and railway vehicles. Flat springs are single-leaf spring steel, mostly used in mechanical equipment and instruments to clamp working components.

36/6/2 Spring Applications

1) For blacksmiths: Because leaf springs are made of higher-quality steel, they are a favorite material for blacksmiths. In countries such as Nepal, Bangladesh, the Philippines, and Pakistan, where traditional blacksmiths still produce a large volume of tools, discarded car leaf springs are often used to make knives and other tools. 2) Used in trampolines: Leaf springs have replaced traditional coil springs in some trampolines (known as soft-edge trampolines), improving user safety and reducing the risk of concussion. Leaf springs are spaced around the frame 'legs,' branching from the base frame to suspend the jumping mat, thereby providing elasticity. 3) Used in clutches: The 'diaphragm' common in automotive clutches is a type of leaf spring.

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