Slotted Disc Springs
Applications and Advantages of Slotted Disc Springs
Disc Spring Engineering
Maximum load - minimum space - maximum flexibility
SLOTTED DISC SPRINGS
The inclusion of slots on either the inner or outer diameter creates a lever which works on the unslotted portion of the spring. This has the effect of reducing the spring load and increasing the deflection (figure 39).
Figure 39 – click to enlarge
Slotted disc springs have a softer characteristic with a large deflection and, in proportion to the outside diameter, smaller spring loads. It is crucial with this type of spring that the permissible stresses in the annular portion are not exceeded. If necessary, the outside diameter must be increased to compensate.
Taking these limitations and a few design features into account, slotted disc springs offer many possible applications. The classic example is the automotive clutch spring. Notable are the slotted ball bearing preload springs which give extremely low loads.
The first approximation for the calculation of slotted disc springs can be achieved by considering the lever arm and the formula on page ‘Equations for calculations‘. The loads generated depend largely on the shape of the slots or the corresponding fingers. The deflection of the fingers is only a small percentage of the total deflection and can be ignored.
Benefits of Slotted Disc Springs:
- Enhanced Flexibility: The slots in slotted disc springs provide increased deflection, making them ideal for applications requiring greater movement.
- Load Reduction: These springs offer reduced spring loads while maintaining effectiveness, crucial for sensitive applications.
- Versatile Applications: Widely used in automotive clutches, slotted disc springs are also excellent for ball bearing preload applications, providing low load and high precision.
- Stress Management: Proper design ensures that stresses in the annular portion are managed effectively, preventing overloading and extending spring life.
- Customisable Designs: Depending on the application, the shape and placement of slots can be tailored to achieve specific load and deflection characteristics.
If you need to consider the use of slotted disc springs, please contact us to discuss your application needs. IEC provides expert guidance to ensure your springs meet the precise requirements of your application.
