German pit federn springs pit federn models pit federn prices

pit federn springs are a new type of elastic component that uses high-pressure nitrogen as the working medium. They feature compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), a flat force-deflection curve, and no need for pre-loading. They perform tasks that conventional elastic components such as metal springs, rubber, and air cushions struggle to accomplish, simplifying mold design and manufacturing, facilitating mold installation and adjustment, extending mold service life, and ensuring stable product quality. They can also be configured as a nitrogen spring system to operate as part of the mold, enabling constant pressure and delayed action within the system. They represent the next generation of ideal elastic components with flexible performance.

pit federn spring operating principle

When leaf springs are installed in an automotive suspension and subjected to positive vertical loads, each spring leaf deforms under stress, tending to arch upward. At this point, 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, sometimes even reversing. The eye of the main leaf is heavily stressed and is a weak point. To improve the stress condition at 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-around eye. A large gap is left between the main leaf eye and the second leaf's wrap-around eye to allow relative sliding during elastic deformation. In some suspensions, the ends of the leaf springs 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 the hanger with a pin, and the other end is connected to the frame rail with a shackle, allowing the spring to expand and contract. This design is suitable for medium and heavy-duty 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 via suspension, exposed between the frame and axle, absorbing load impacts from the wheels on the frame, reducing severe vehicle body vibration, and maintaining driving stability and adaptability to different road conditions. When leaf springs absorb load impacts, they undergo extension motion, causing intense friction between the steel leaves, resulting in compression and tension. The two friction surfaces generate frictional forces in opposite directions, causing the leaf spring temperature to rise, leading to surface scoring and fine cracks. As the frequency of load impacts increases, the frictional force generated by the extension motion also increases. When the stress concentration point reaches the fatigue limit, single-leaf or entire stack fracture occurs. Kinetic 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 their higher elasticity makes them 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 prioritize timely leaf spring lubrication to reduce friction, distribute stress, prevent surface scoring of the steel leaves, minimize intrusion of dust, dirt, and water to prevent corrosion, and dissipate heat to prevent reduction in elastic strength. Standard lubrication procedures should begin after the new vehicle break-in period is complete, and be performed 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 (comparing the time required for one set of leaf spring lubrication to replacing a single broken leaf).

pit federn 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 of the suspension and the guiding device. One end is hinged to the frame, allowing it to transmit various forces and torques and determine the wheel's runout trajectory. At the same time, it provides a certain degree of frictional damping. Achieving three benefits at once, it is widely used in non-independent suspensions. Leaf springs are classified by shape: 1) Elliptical leaf spring; 2) Semi-elliptical leaf spring; 3) Quarter-elliptical leaf spring; 4) Single-leaf spring. Elliptical, semi-elliptical, and quarter-elliptical leaf springs are all composite types of leaf springs, relying on the friction between the leaves to provide high buffering and vibration damping performance, and are widely used in the suspension systems of automobiles, tractors, and railway vehicles; single-leaf springs are made of single-piece spring steel and are mostly used in mechanical equipment and instruments to press working components.

pit federn spring applications

Disc springs are replacing cylindrical helical springs in a wide range of applications. They are commonly used in heavy machinery (such as presses) and weapons like artillery and aircraft as high-force buffering and damping springs, as clamping springs for automotive and tractor clutches and safety valves, and as energy storage elements in mobile devices. Disadvantage: Load deviation is difficult to guarantee. Disc springs are categorized into three types based on cross-sectional shape: standard disc springs (rectangular cross-section), disc springs with radial slots, and trapezoidal cross-section disc springs. Standard disc springs are divided into those with and without bearing surfaces. Disc springs with radial slots are derived from standard disc springs, with several uniformly distributed slots cut radially. Slots can be cut from the inner hole toward the outer diameter or from the outer diameter toward the inner hole. Trapezoidal cross-section disc springs are divided into two types: those with inner edge thickness greater than outer edge thickness, and those with inner edge thickness less than outer edge thickness. Since the deformation and load values of a single disc spring often fail to meet application requirements, they can be used in groups to form disc spring assemblies (columns). Typical combinations include: stacked disc spring assemblies, compound disc spring assemblies, and other disc spring combinations. Compared to cylindrical helical springs, disc springs have the following characteristics: 1) The load-deflection characteristic curve is nonlinear. 2) Disc springs are thin-walled, making them easy to form into assemblies for modular assembly and replacement, facilitating maintenance. 3) Disc springs with radial slots exhibit zero stiffness characteristics. This property is applicable where spring force must remain essentially constant within a specific deformation range. 4) Disc spring vibration absorption performance is no lower than that of cylindrical helical springs. When using stacked combinations, friction between disc spring leaves provides significant damping, dissipating impact energy.

Weidou Intelligent Technology specializes in selling German pit federn compression springs, pit federn extension springs, pit federn helical springs, pit federn wave springs, pit federn constant force springs, pit federn torsion springs, pit federn bending springs, pit federn disc springs, pit federn ring springs, pit federn leaf springs, pit federn torsion bar springs, pit federn tension springs, pit federn retaining rings, pit federn tension springs, pit federn die springs. All pit federn products are original imports from Germany. Customers are welcome to inquire and order.