German koelle springs koelle models koelle prices

koelle springs, as elastic elements, are widely used in the suspensions of modern automobiles, including passenger cars, trucks, and off-road vehicles. Compared with leaf springs, torsion bar springs offer a series of advantages: high energy storage per unit mass, which reduces vehicle weight and saves material; since the torsion bar spring is fixed to the frame, it reduces unsprung mass, helping to improve ride smoothness; when applied to the front suspension of front-wheel-drive vehicles, the torsion bar spring can be arranged longitudinally, leaving space for the swinging half-shafts of the front drive axle. However, torsion bar manufacturing costs are relatively high, with strict requirements for materials and processes. In addition, torsion bar springs serve only as elastic elements and must be equipped with guiding mechanisms. Torsion bar springs are made of chrome-vanadium alloy spring steel, and their surfaces are very smooth after machining. The surface of the torsion bar must be well protected during use. Typically, a layer of epoxy resin is applied to the surface of the torsion bar spring, wrapped with a layer of fiberglass cloth, coated with another layer of epoxy resin, and finally coated with asphalt and anti-rust paint to prevent collision, scratching, and corrosion, thereby extending the service life of the torsion bar spring.

koelle spring influencing factors

Springback includes angular springback and curvature springback, which is the result of the combined effect of springback in the bending deformation zone and the non-deformation zone. Many factors affect springback, mainly including: (1) material mechanical properties σs, Eoσs the higher the value, the smaller the E value, the greater the bending springback; (2) degree of deformation r/t. Under the same conditions, the amount of angular springback increases as the r/t value increases; the amount of curvature springback decreases as the r/t value increases; (3) bending center angle αo a larger bending center angle α results in a larger springback angle; (4) die clearance Z. Larger clearance between the punch and die results in greater springback; (5) bending method. Free bending has large springback, corrected bending has smaller springback, and full-form upsetting calibration bending has the smallest springback; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraints have smaller springback, while springback is greater after work hardening; (7) die structure and magnitude of blank holder force. Greater blank holder force results in smaller springback after bending the workpiece.

koelle spring classification

1) Torsion springs are springs that withstand torsional deformation, and their working part is also closely wound into a helical shape. The end structure of a torsion spring is processed into various shapes of torsion arms, rather than hooks or loops. Torsion springs utilize the lever principle, twisting or rotating elastic materials with softness and high toughness to generate significant mechanical energy. 2) Extension springs are helical springs that withstand axial tensile forces. When not under load, the coils of extension springs are generally tightly closed with no gaps. 3) Compression springs are helical springs that withstand axial compressive forces. The cross-section of the material used is mostly circular, but rectangular and multi-strand steel wires are also used. Springs generally have equal pitch. The shapes of compression springs include: cylindrical, conical, convex, concave, and a small number of non-circular shapes. There is a certain gap between the coils of compression springs. When subjected to external loads, the spring contracts and deforms, storing deformation energy. 4) Progressive springs. This type of spring adopts a design with inconsistent thickness and density. The advantage is that when the pressure is low, the part with a lower spring constant can absorb road undulations, ensuring riding comfort. When the pressure increases to a certain extent, the thicker part of the spring supports the vehicle body. The disadvantage of this type of spring is that the handling feel is not direct, and the precision is poor. 5) Linear springs. The thickness and density of linear springs remain unchanged from top to bottom, and the spring constant is a fixed value. This design allows the vehicle to obtain a more stable and linear dynamic response, which is beneficial for drivers to better control the vehicle. It is mostly used in performance-oriented modified cars and competitive vehicles. The downside is that comfort is affected. 6) Short springs. Short springs are shorter and thicker than original factory springs. Installing short springs can effectively lower the vehicle's center of gravity, reduce body roll during cornering, make cornering more stable and smooth, and improve the vehicle's cornering handling. However, the damping setting of original factory shock absorbers tends towards comfort, so the combination of short springs and original factory shock absorbers is not very stable. They cannot effectively suppress the rebound and compression of short springs. When driving on bumpy roads, there will be an uncomfortable jumping sensation. Over time, the life of the shock absorbers will be greatly shortened, and oil leakage may occur. Of course, these situations are relative. Daily driving will not cause such severe damage, and aggressive driving should be avoided as much as possible, since original factory shock absorbers cannot withstand high-load pressure.

koelle 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 number of tools, leaf springs from scrapped cars are often used to make tools such as knives. 2) Used in trampolines: Leaf springs have also replaced traditional coil springs in some trampolines (known as soft-edge trampolines), which improves user safety and reduces 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 common "diaphragm" in automotive clutches is a type of leaf spring.

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