Load vs. Deflection

Belleville Disc Springs can be used to compensate for differing expansion rates in joints, can act as shock absorbers or perform dampening function. Deflection and load characteristics of he disc springs can be changed by stacking the springs in parallel or series.

Use the chart shown below to determine load vs. deflection for your Belleville Disc Springs.

Bolt and High Load Bellevilles

These types of bellevilles are used in applications where high loads are required. Along with their thick nature, these bellevilles feature dimensional ratios that are lower than normal, which help the belleville to withstand higher loads.

The smaller OD/ID ratio shortens the cross-sectional moment arm of the belleville which gives the belleville greater resistance to the moment created by a force acting on the part. Applications for this belleville include but are not limited to:

    • Flange Bolting
    • Downhole Drilling Heads

Since these bellevilles are so thick, they are less resistant to fatigue. Therefore the high load series bellevilles are recommended for static application, but can be altered to fit a dynamic application if necessary.

Standard Bellevilles

The standard Belleville series consists of the most common properties of Bellevilles. They incorporate dimensional ratios that fall within their specified ranges. This type of Belleville can be used for a wide variety of purposes including but not limited to:

    • Vibration Dampening
    • Shock Absorption
    • Expansion Compensation

One of the better features of the standard series bellevilles are that they have excellent fatigue resistance. The low stressed nature of these bellevilles gives them the ability to be used in dynamic applications where many cycles are required.

Force Limiting Bellvilles

The force limiting belleville types feature a load curve that starts off fairly linear and a high spring rate, but then tapers off into a nearly flat curve before going flat. This interesting feature on the load curve gives bellevilles the ability to apply a substantial load to a certain point, then level off and keep the same load and still allow for some deflection.

This feature is a acceptable fit for clutch/brake applications. These bellevilles are also suitable for valve applications that need to open or close at a certain force, such as pressure relief valves.

Force Adjusting Bellevilles

This unique Belleville features a high dish height to thickness ratio, that, when compressed, will resist force quickly, and then taper off and lose force after a certain percentage of deflection. This feature works well with many valve applications for sealing purposes. Once on the downward slope of the curve, when the belleville is relaxed, it will apply a greater force to a certain point, ensuring that the valve stays sealed.

The stresses on this type of belleville tend to be very high due to the spring’s general nature of having a large dish height. To avoid having very high stresses, the part usually incorporates a large OD/t ratio, usually in the range of 60 to 90. As long as these types of bellevilles are designed properly, they can have exceptional fatigue resistance and can be used in an application that sees many cycles.