Wave spring washers mainly include single-layer motor steel wave springs and multi-layer wave springs. The multi turn wave springs are also called a multi-layer wave spring washer. Multiple peak-valley elastic metal elements, usually used in spacecraft, bearings, flow valves, pressure valves, clutches, vibration isolators, axial piston pumps, drives and other equipment.
The main function of the wave spring washer is to protect the surface of the connector to prevent the surface of the workpiece from being scratched when the bolt and nut are tightened; the spring washer in the spring washer has the function of preventing loosening, while the flat washer only has the effect of increasing the contact area. Just like the bolts connecting the motor and the base, spring washers are usually added to the two. If the TV without the spring washers suddenly vibrates, the nuts will easily loosen. Therefore, spring washers are installed on the fastening parts of products that generally have vibrations. However, for some important connections, such as places that rely mainly on compression to generate frictional force to transmit power, spring pads cannot be used, and the rigidity of the connection is reduced, which is prone to accidents.
For flanges, some flanges do not need to add spring gaskets, because whether or not to add spring gaskets to the flange is related to the medium circulating in the pipeline. If it is easy to generate pulses, it is better to add a spring washer, otherwise there is no need to add a spring washer. These cannot be generalized. For some valves, spring washers are added to the gland flange of the stuffing box.
The basic function of the spring washer is to give a force to prevent loosening after the screw and bolt are tightened. Add friction between the screw bolt and the material. Thereby, the material is fastened in the vibration and the loosening between the screw bolt and the material is prevented. Simply put, the role of the spring washer is to play the role of a protective measure.
Anti-loose principle of spring washer:
The anti-loosening principle of the spring washer is that after the spring washer is flattened, the spring washer will generate a continuous elastic force, so that the threaded connection pair between the nut and the bolt will continue to maintain a frictional force and generate a resistance torque, thereby preventing the nut from loosening. At the same time, the sharp corners at the opening of the spring washer are respectively embedded in the surface of the bolt and the connected part, thereby preventing the bolt from rotating relative to the connected part.
However, it has been proven that spring washers can only provide a spring force of 10 N/m, which is negligible for a bolt preload of 280 N/m. Secondly, such a small force is not enough to make the sharp corners of the spring washer cut into the surface of the bolt and the connected part. After disassembly, there is no obvious indentation on the surface of the bolt and the connected parts. Therefore, the anti-loosening effect of the spring washer on the bolt can be ignored.
There are several types of spring washers
- Internal tooth elastic washer, external tooth elastic washer
There are many sharp elastic warping teeth on the circumference, and the thorns press on the supporting surface, which can prevent the loosening of the fastener. The inner tooth elastic washer is used under the screw head with smaller head size; the outer tooth elastic washer is mostly used under the bolt head and the nut. The elastic washer with teeth is smaller than the ordinary spring washer, the fastener is evenly stressed, and it is reliable to prevent loosening, but it is not suitable for frequent disassembly.
National standard: GB/T 7246-1987 Wave spring washers are divided into WG type, WL type and WN type. WG-type wave spring washer: WG-type wave spring washer is an open-type elastic washer, which can usually be installed in a small space, such as applying prestress to the bearing, reducing the noise of bearing operation, improving the running accuracy and stability of the bearing. There are also a large number of application materials, such as carbon steel, stainless steel, copper alloy and so on.
- Disc spring washer
Disc spring washer, also known as Belleville spring washer, was invented by the French Belleville. DIN6796 Disc Spring Washers (HDS Series) are lock washers designed for bolted and screwed connections. It is designed and manufactured according to DIN 6796 for the connection of medium or high strength bolts and screws. The large bearing load and elastic recovery make the HDS series very effective, and the bolt tension can withstand slack due to: wear of consumables, creep, relaxation, thermal expansion, contraction, or compression of seals.
What is the difference between the application of wave spring washer and ordinary spring washer?
The elasticity of the ordinary spring washer is relatively large, and the anti-loose effect is obvious and reliable by its large elastic force and the friction force of the oblique opening. It is used for anti-loose occasions of common mechanical structures.
The wave spring washer presses the connected parts by its elastic deformation to prevent loosening. Usually used for general anti-loosening requirements. For example, this spacer is used to prevent the link between the two blades of hair clippers from loosening.
Zhejiang Lisheng Spring specializes in the production of wave springs, our products include Multi Turn Wave Springs, spiral retaining ring, wave spring washer and so on. At present, our company has thousands of conventional products in stock. If you are interested in our products, please contact us.