German kern liebers springs, kern liebers models, kern liebers prices

kern liebers springs are a special type of extension spring, suitable for applications with large elongation and non-increasing load. Constant-force springs consist of spiral metal strips; the inner side of the strip is curved so that each coil wraps tightly around the inner coil. When the metal strip is stretched (twisted), internal stress resists the load force, just like in ordinary extension springs, but the spring rate is nearly constant (zero). See the load/torsion diagram. In use, an ID is typically used to wind this spring tightly onto a drum, with its free end connected to the load, acting like a counterweight. Alternatively, the free end can be fixed, allowing the spring itself to provide the working force, similar to carbon brushes in electrical devices.

kern liebers spring installation and removal

Hydraulic hand pallet trucks are widely used in production. During maintenance of their pressure oil pumps, we found that the return spring for the pump's piston rod and the truck's pressure arm has a wire diameter of n, with a stored elastic force reaching 1000N. This makes installation and removal very difficult, often delaying troubleshooting and directly affecting production schedules. Previous measures proved ineffective. Therefore, I designed the pressure spring installer/remover shown in Figure 1. The tool consists of a lower pressure lever 1, pressure blocks 10, connecting pins 14, nuts 1, spherical washers 12, upper pressure lever 13, positioning sleeves 16, and levers. To operate, rotate the nut 11 to the appropriate position so that the cylindrical head claw of the lower pressure lever 1 contacts the truck body 2. Symmetrically press the two pressure blocks 10 against the washer 6. Rotate the compression nut n to tighten the pull rod 15, causing relative movement between the upper pressure lever 13 and lower pressure lever 1, thereby compressing the pressure spring. When the washer 6 clears the cylindrical pin 7, the pressure roller shaft 9, pressure roller 8, and cylindrical pin 7 can be removed. Then, loosen the nut 11, remove the installer/remover, and take out the pressure spring to disassemble, inspect, and repair the pressure oil pump. The positioning sleeve 16 on the installer/remover is a critical component. During manufacturing, one end features an internal spherical surface with a slot-shaped hole in the middle, while the other end is an inclined flat surface, forming an interference fit with the pressure lever. It must maintain good contact with the spherical washer 12 and the ball head of the lever 15. The pressure block 10 and connecting pin 14 have a clearance fit to ensure flexible rotation. The connecting pin 14 and upper pressure lever 13 have an interference fit. The connecting shaft 18 and pressure lever have a clearance fit.

kern liebers spring composition

Ring springs are compression springs 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 diameter changes, the spring shortens in length; when the external force is removed, since the ring cone angle b is greater than the friction angle, the spring restores its original dimensions under 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 considerable energy. At this time, the force and deformation remain linearly related. During loading, the external force P equals the sum of the spring's internal 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 heavy-duty springs with significant buffering and shock absorption capabilities (the ratio of area OABO to OACO can reach 60～70%). They are commonly used in buffering devices for heavy vehicles, artillery, and aircraft landing gear.

kern liebers spring functions and applications

1) Reset function: Springs deform under external force and return to their original state once the force is removed. Many tools and equipment utilize this property for resetting. For example, reset springs are installed on the hinges of many building doors, allowing them to automatically reset after people pass through. This function is also used in items like automatic umbrellas and mechanical pencils, offering great convenience. Additionally, reset springs are essential for various buttons and keys. 2) Drive function: Mechanical clocks and wind-up toys are driven by tightening mainsprings. When tightened, the mainspring bends and stores elastic potential energy. Upon release, this energy converts into kinetic energy, driving rotation through the transmission mechanism. Toy guns, starting pistols, and military firearms also operate using this spring property. 3) Buffering function: Springs are installed between the frame and wheels of locomotives and automobiles to use elasticity to reduce vehicle bumps. 4) Vibration and sound generation function: When air flows through the reed holes of harmonicas and accordions, it strikes the reeds, causing them to vibrate and produce sound.

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