German hemscheidt springs hemscheidt models hemscheidt prices

hemscheidt springs are elastic elements with multiple peaks and valleys on a thin metal ring. They are typically used in applications where the load and deformation are small, requiring low spring stiffness and the application of axial preload. Wave springs are particularly suitable for weight-sensitive applications and those constrained by limited installation space. Typical application areas include aerospace, precision machinery, hydraulic seals, and high-end motors. This product is a thin, ring-shaped elastic metal element composed of multiple peaks and valleys. It is made from high-quality spring steel 65Mn (60Si2MnA/50CrVA /0Cr17Ni7Al /SUS304), heat-treated using specific methods, and depending on specific conditions, the hardness is generally controlled between HRC44 and 55. The surface is blackened, providing good elasticity. Wave springs are widely used in industries such as motors, textile machinery, hydraulic equipment, and automotive. They are mainly installed in bearing housings or bores suitable for their nominal dimensions, occupying minimal installation space, and offer special functions such as noise reduction and vibration damping.

hemscheidt 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 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 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 large gap is left between the main leaf eye and the second leaf wrap eye to allow 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 the hanger with a pin, and the other end is connected to the frame with a shackle, allowing the spring to expand and contract. This design is suitable for medium and large trucks. Automobile leaf springs are very 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 vibrations, 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 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 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, it causes single-leaf or entire-stack fracture. Kinetic principle tests have proven that a steel component undergoing compression-extension motion experiences a temperature rise and strength decrease as the motion frequency increases. Cracks appear at stress concentration points, gradually expanding and deepening until the fatigue limit is reached and damage occurs. Leaf springs behave similarly, though 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 helps reduce friction and distribute stress, preventing surface scoring of the steel leaves; reduces intrusion of dust, dirt, and water to prevent corrosion; and aids in heat dissipation to prevent a decrease in elastic strength. General lubrication procedures should begin after the new vehicle break-in period is completed, and during summer and winter operation. 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 lubricating one set of leaf springs to replacing one broken leaf).

hemscheidt spring classification

1) Torsion springs: Torsion springs (torsional springs) utilize the lever principle, twisting or rotating elastic materials with softness and high toughness to store significant mechanical energy. These springs withstand torsional deformation, with working coils either closely wound or spaced apart. The ends of torsion springs are processed into various shapes of torque arms, ranging from single to double torsion, and even various torsion bar deformations, depending on the design. Torsion springs are commonly used in balancing mechanisms in machinery and are widely applied in automotive, machine tool, and electrical industrial production. 2) Compression springs: Compression springs are helical springs that withstand axial pressure. Springs are generally classified into constant-pitch and variable-pitch types. Compression spring shapes include cylindrical, conical, convex, concave, and a small number of non-circular forms. There is a certain gap between the coils of a compression spring. When subjected to external loads, the spring compresses and deforms, storing deformation energy. Variable-pitch springs are becoming increasingly common, no longer limited to constant-pitch designs. Variable-pitch springs can perform differently in various environments. 3) Carbon nanotube springs: Carbon nanotube springs can have diameters reaching hundreds of micrometers and lengths up to several centimeters. Their spun structure has broad application prospects, potentially applicable in stretchable conductors, flexible electrodes, micro strain sensors, supercapacitors, integrated circuits, solar cells, field emission sources, and energy-dissipating fibers. This makes it possible to prepare carbon nanotube electronic devices visible to the naked eye. They are also expected to be used in medical devices, such as tension-sensing bandages. This novel structure can further develop into multifunctional carbon nanotube fiber composites for utilization. 4) Extension springs: Extension springs (tension springs) are helical springs that withstand axial tensile forces. Extension springs are generally manufactured from round cross-section materials. When not under load, the coils of an extension spring are usually tightly closed with no gap. They work using the rebound force (tensile force) after extension, used to control component movement, store energy, measure force magnitude, etc., and are widely used in machines and instruments. Hook forms include side-hook extension springs, long-hook extension springs, British-hook extension springs, German-hook extension springs, semi-circular hook extension springs, duck-bill hook extension springs, etc. Materials include stainless steel, music wire, high-carbon steel, phosphor bronze, beryllium copper, and oil-tempered alloy spring steel. 5) Air springs: Air springs are non-metallic springs that achieve elastic action by adding pressurized air into a flexible sealed container, utilizing the compressibility of air. They can be roughly divided into bladder type and diaphragm type. Air springs have excellent elastic characteristics. Using them in high-end vehicle suspension systems can greatly improve vehicle ride smoothness, thereby significantly enhancing driving comfort. Therefore, air springs are widely used in automobiles and railway locomotives. Additionally, due to their many advantages over ordinary steel springs, they are also applied in some mechanical equipment and precision instruments.

hemscheidt spring classification

1) ISO International Standard Type: ISO nitrogen gas springs are the most common typical type of nitrogen gas spring. All technical parameters comply with the ISO11901 nitrogen gas spring international standard and Chinese national standards. The B type nitrogen gas spring also complies with the nitrogen gas spring standards of companies such as FORD-WDX3560 (Ford), GM-M-150 (General Motors), and Renault (Renault). 2) Compact Structure Type: The compact structure type is also called the J type nitrogen gas spring, a series within the nitrogen gas spring product line, fully named J type compact structure nitrogen gas spring. The J type compact structure nitrogen gas spring is a type favored by mold designers. Compared to the B series nitrogen gas springs, it has a shorter cylinder base length, resulting in a shorter total length, which can reduce the design height of the mold. It is one of the preferred varieties for mold-specific nitrogen gas springs. 3) Ultra-Compact Type: This is the model with the shortest base length among nitrogen gas springs worldwide. Simultaneously, its outer diameter is one size smaller than other types of nitrogen gas springs (except for the T type extra-slim structure), but the piston rod diameter remains the same, making it small in size yet powerful. The C type nitrogen gas spring performs no worse than the ISO standard type nitrogen gas spring in all aspects when the required working stroke is not too long. 4) Extra-Slim Structure Type: This is the most compact cylinder diameter type among nitrogen gas springs. It features piston sealing, and its outer diameter is even smaller than the ultra-compact type. The working stroke of the H type nitrogen gas spring series generally does not exceed 50mm, and its performance in all aspects is no inferior to the C type nitrogen gas spring.

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