German hdu springs hdu models hdu prices

hdu springs are commonly used in wheeled vehicle suspensions. Initially known as laminated or bracket springs, and sometimes as semi-elliptical or cart springs, they are one of the oldest forms of springs, dating back to the Middle Ages. Leaf springs consist of long, arc-shaped spring steel strips with a rectangular cross-section. In the most common configuration, the center of the arc provides the axle position, 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 and a certain degree of damping as well as 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 tensioning strap introduces a tendency for the leaves to elongate under compression, thereby making the spring softer. Some springs terminate in a recessed end, called a spoon end (rarely used), designed to support rotating components.

hdu spring classification

1) Based on the characteristics of the load during operation, helical springs can be divided into three types: compression, extension, and torsion; 2) According to structural features, they can be divided into two main categories: cylindrical helical springs and variable-diameter helical springs; variable-diameter helical springs mainly bear compressive loads; 3) Based on shape characteristics, they can be divided into conical, volute, concave, and convex shapes. 4) In terms of production and use, helical springs can also be divided into large helical springs and small helical springs based on forming methods and material diameter; the former are typically hot-formed, while the latter are cold-formed. 5) Other classifications: There are many types of helical springs. By external shape, they can be divided into: ordinary cylindrical helical springs; variable-diameter helical springs. By the direction of the helix, they can be divided into: left-hand springs; right-hand springs. Variable-diameter helical springs are divided into: conical helical springs, volute helical springs, and concave helical springs. Cylindrical helical springs have a simple structure, are easy to manufacture, and are the most widely used. Their characteristic curve is linear, allowing them to serve as compression springs, extension springs, and torsion springs. When the load is high and radial dimensions are limited, two compression springs with different diameters can be nested together to form a combination spring.

hdu spring composition

Ring springs are a type of compression spring composed of several inner and outer rings with conical surfaces. Under axial load P, significant normal pressure is generated between the contact surfaces of the inner and outer rings, causing the inner ring diameter to decrease and the outer ring diameter to increase. Due to these changes in diameter, the spring shortens in length; when the external force is removed, since the cone angle b of the rings is greater than the friction angle, the spring returns to its original dimensions under the action of elastic internal forces. When ring springs bear axial P, significant friction is generated between the conical contact surfaces of the inner and outer rings, dissipating a large amount of energy. At this time, the force and deformation remain in a linear relationship. During the loading process, the external force P equals the sum of the spring's internal elastic force and friction. ABO represents the unloading process, which includes two stages: the AB segment and the BO segment. The AB segment indicates the situation where the load decreases, and the spring's elastic internal force overcomes static friction, gradually restoring the spring to its original state. The inner and outer rings of ring springs are made of high-quality carbon steel or wear-resistant alloy steel. Each ring is first roll-formed to the required shape to enhance its load-bearing capacity, followed by heat treatment. Ring springs are powerful springs with significant buffering and shock-absorption capabilities (the ratio of area OABO to OACO can reach 60～70%), and are commonly used in buffering devices for heavy vehicles, artillery, and aircraft landing gear.

hdu spring features and applications

Features: Compared to ordinary compression or extension springs, their spring force is very constant, providing an output close to a linear force curve. This ensures that the product does not vary due to changes in spring force during use. In narrow and elongated spaces, they allow for maximum space reduction, enhancing possibilities for aesthetic product design. Constant force spring applications: adjustable fans, LCD monitors, vertical sliding windows and doors, supermarket automatic checkout counters, motor brush holding devices, cables, stapler springs, power tools, car ashtrays, locomotive brush accessories, medical instruments, mobile phone holders, etc.

Weidou Intelligent Technology specializes in selling German hdu compression springs, hdu extension springs, hdu helical springs, hdu wave springs, hdu constant force springs, hdu torsion springs, hdu bending springs, hdu disc springs, hdu ring springs, hdu leaf springs, hdu torsion bar springs, hdu tension springs, hdu retaining rings, hdu tension springs, hdu die springs, all originally imported from Germany. We welcome inquiries and orders from customers.