German leespring springs leespring models leespring prices

leespring springs are helical springs that withstand axial tensile forces. Extension springs are generally manufactured from materials with a circular cross-section. When not under load, the coils of an extension spring are typically closed together with no gap. Many different terminal devices or "hooks" are used to ensure the source of tension for the extension spring. The working principle of extension springs is opposite to that of compression springs. Compression springs exert a reactive force when compressed, while extension springs exert a reactive force when extended or pulled apart. When the two ends of an extension spring are pulled apart, the spring attempts to pull them back together. Like compression springs, extension springs also absorb and store energy. However, unlike compression springs, most extension springs are usually under a certain degree of initial tension, even without any external load. This initial tension determines the tightness of the extension spring's coils when there is no load.

leespring spring principles

When leaf springs are installed in an automobile suspension and subjected to positive vertical loads, each spring leaf deforms under stress, tending to arch upward. At this time, the axle and the frame move closer to each other. When the axle and the frame move apart, the positive vertical load and deformation on the leaf spring gradually decrease, sometimes even reversing direction. 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 between the leaves during elastic deformation. In some suspensions, the ends of the leaf springs are not formed into eyes but use other support connection methods, such as rubber support pads. Flat rectangular steel plates are curved and stacked to form chassis springs. One end is mounted on a hanger with a pin, and the other end is connected to the frame beam with a shackle, allowing the spring to expand and contract. This type is suitable for medium and large trucks. Automobile leaf springs are very important. As is well known, leaf springs are composed of many steel leaves that are elastic, have consistent width and thickness, but vary in length. Their function is to connect the frame and the axle via suspension, exposed between the frame and the axle, bearing the load impact from the wheels on the frame, reducing severe vehicle vibration, and maintaining driving stability and adaptability to different road conditions. When leaf springs bear load impacts, they undergo extension motion, causing intense friction between the steel leaves, resulting in compression and tension phenomena. The two friction surfaces generate frictional forces in different directions, causing the temperature of the leaf spring to rise, leading to surface scoring and the appearance of 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 will cause single-leaf or entire stack fracture. Tests based on the principles of kinematics have proven that for a steel component undergoing compression-extension motion, as the motion frequency increases, the temperature of the component rises, strength decreases, cracks appear at stress concentration points and gradually expand and deepen, leading to damage upon reaching the fatigue limit. Leaf springs are similar, although they have higher elasticity and are more durable than general steel components. Apart from other causes, the main reason for leaf spring fracture is poor lubrication, which should be taken seriously by drivers and technical management personnel. Timely lubrication of leaf springs should be performed to reduce friction and disperse stress, preventing surface scoring of the steel leaves; reduce the intrusion of dust, dirt, and water to prevent rust; and dissipate heat to prevent a decline in elastic strength. The general lubrication method is: perform lubrication 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 grease or graphite grease to both sides of the steel leaves. After reassembly, an oil film is formed between the two friction surfaces (completing the lubrication of one set of leaf springs takes only as much time as replacing one broken leaf).

leespring spring materials

Disc springs are mostly manufactured from cold-rolled or hot-rolled strip steel, plate steel, or forged blanks (forging ratio not less than 3). The materials commonly used are spring steels such as 60S2MA and 50CVA. For thicknesses less than 1.1, high-carbon steel can also be used. The performance requirements for disc spring materials are that, after heat treatment, they should possess high ultimate strength, yield limit, elastic limit, and fatigue limit, while also requiring high impact toughness, plasticity, and the highest possible yield ratio. To meet these performance requirements, high-quality cold-rolled or hot-rolled steel strips or plates are mostly used domestically and internationally. For disc springs with a thickness greater than 6 mm, forged blanks are used. The steel grades are mainly medium-carbon low-alloy spring steels (silicon-manganese or chromium-vanadium spring steels) and high-quality carbon spring steels. Due to the high silicon-manganese content and low chromium-vanadium content in China, disc springs mainly use 60Si2MnA. Comparing the two, 50CrVA has better hardenability, temper stability, and impact toughness than 60Si2MnA, but 50CrVA is more expensive and suitable for applications with high fatigue requirements.

leespring spring functions and applications

1) Reset function: The spring deforms under external force and returns to its original state when the force is removed. Many tools and devices utilize this property of springs for resetting. For example, reset springs are installed on the hinges of many building doors, allowing the door to automatically reset after people enter or exit. This function is also used in products such as automatic umbrellas and mechanical pencils, offering great convenience. In addition, various buttons and keys invariably require reset springs. 2) Drive function: Mechanical clocks and clockwork toys are driven by winding up the mainspring. When the mainspring is wound, it undergoes bending deformation and stores a certain amount of elastic potential energy. Upon release, the elastic potential energy is converted into kinetic energy, driving rotation through the transmission mechanism. Toy guns, starting pistols, and military firearms also operate based on this property of springs. 3) Buffering function: Springs are installed between the frame and wheels of locomotives and automobiles, utilizing the elasticity of the springs to mitigate vehicle vibration. 4) Vibration and sound generation function: When air flows through the reed holes in harmonicas and accordions, it strikes the reeds, causing them to vibrate and produce sound.

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