German dreyer federn springs, dreyer federn models, dreyer federn prices

dreyer federn 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 with a rectangular cross-section. In the most common configuration, the center of the arc provides the axle position, while loops 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 leaves. Leaf springs can be used for positioning and a certain degree of damping as well as spring function. Although interleaf friction provides a damping effect, it is poorly controlled and results in static friction during suspension movement. For this reason, some manufacturers have begun using single-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 tension 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), for supporting rotating components.

dreyer federn spring installation and removal

Hydraulic lift hand trucks are widely used in production. During maintenance of their pressure oil pumps, we found that the pressure spring responsible for returning the piston rod of the pressure oil pump and the pusher arm of the truck has a wire diameter of n and stores elastic force up to 1000N, making its installation and removal very difficult. This often delays troubleshooting time and directly affects production progress. Several measures were taken, but none were effective. Therefore, I designed a pressure spring installer/remover as shown in Figure 1. The installer/remover consists of a lower pressing rod 1, pressing blocks 10, connecting pins 14, nuts 1, spherical washers 12, upper pressing rod 13, positioning sleeve 16, and rods. During operation, rotate the nut 11 to an appropriate position so that the cylindrical head claw of the lower pressing rod 1 contacts the vehicle body 2, and the two pressing blocks 10 press symmetrically on the washer 6. Rotate the tightening nut n; through the tie rod 15, the upper pressing rod 13 and lower pressing rod 1 move relative to each other, forcing the pressure spring to compress. When the washer 6 separates from the cylindrical pin 7, the pressure wheel shaft 9, pressure wheel 8, and cylindrical pin 7 can be removed. At this point, loosen the nut 11, remove the installer/remover, take off the pressure spring, and proceed with disassembly, inspection, and repair of the pressure oil pump. The positioning sleeve 16 on the installer/remover is a key component; during manufacturing, one end has an internal spherical surface with a slot hole in the middle, and the other end has an inclined flat surface, forming an interference fit with the pressing rod. It must make good contact with the spherical washer 12 and the ball head of the rod 15. The pressing block 10 and connecting pin 14 have a clearance fit, requiring flexible rotation. The connecting pin 14 and upper pressing rod 13 have an interference fit. The connecting shaft 18 and pressing rod have a clearance fit.

dreyer federn spring features and functions

1) Wide stiffness range, strong buffering and vibration absorption capacity, and high deformation energy per unit volume of material. 2) Features variable stiffness characteristics. Stiffness can be adjusted by changing combinations of wave peak height, width, and thickness. Stiffness can also be adjusted by varying the number of stacked discs. 3) Compared to disc springs, it offers advantages such as high strength, good flexibility, and strong impact resistance. 4) Compact structural dimensions, requiring less installation space under the same theoretical parameters. Functions: (1)) Control mechanical motion, such as valve springs in internal combustion engines and control springs in clutches. (2)) Absorb vibration and shock energy, such as buffer springs under automobile and train carriages, and vibration-absorbing springs in couplings. (3)) Store and output energy as power, such as clock springs and springs in firearms. (4)) Used as force-measuring elements, such as springs in dynamometers and spring scales. The ratio of load to deformation in a spring is called spring stiffness; the greater the stiffness, the harder the spring. Springs are elastic elements widely used in the mechanical and electronics industries. Under load, springs undergo significant elastic deformation, converting mechanical work or kinetic energy into deformation energy. Upon unloading, the deformation disappears and the spring returns to its original state, converting deformation energy back into mechanical work or kinetic energy.

dreyer federn spring classification

1) Standard disc springs, trapezoidal cross-section disc springs, conical trapezoidal cross-section. Disc springs: simple shape and structure, widely used. They can be used individually, in opposed pairs, stacked combinations, or composite groups to withstand static or variable loads, serving as high-force buffer and vibration-damping springs in heavy machinery, aircraft, artillery, and other weapons. 2) Diaphragm springs: mainly used in automotive clutches, consisting of separation fingers and disc spring sections. 3) Wave washers: extensively used in mechanical seals, further developable into spiral wave springs. 4) Slotted disc springs: typically used in clutches, such as those in lathes, automobiles, and tractors. 5) Circular plate disc springs: with a circular plate cross-section that deforms into a truncated cone under load. Simple structure, high stiffness, used in applications with special requirements. 6) Spiral disc springs: possess dual characteristics of disc springs and helical springs, allowing for varying stiffness requirements. 7) Wave cylindrical springs (wave springs): formed by stacking wave washers into a cylindrical shape, enabling greater deformation.

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