Applications / Force Or Load Or Torque Limiter

Figure 1. overload protection by disc spring or Belleville washers

Disc springs also called Belleville washers are mainly used in overload limiter for lifting units or electric chain hoist.

When a load is applied between the Plunger and the Casting, the Plunger acts to compress the disc spring or Belleville washers.

As the Belleville springs compresses, the Adjuster mounted on the Plunger Arm moves toward the Switch.

If the load is great enough, the spring will compress enough for the Adjuster to actuate the Switch.

When the Switch is actuated, it breaks the hoist's lifting contactor control circuit.

Material Available:

●Carbon Steel:

     51CrV4 (1.8159 / 6150)

●SUS300 Series Stainless Steel:

     SUS301 (1.4310)

     SUS304 (1.4301)

     SUS316 (1.4401)

●Precipitation Hardening Stainless Steel:

     17-7PH Stainless Steel (1.4568)

●Thermally Stable Stainless Steel:

     X22CrMoV12 1 (1.4923)

●High Temperature Stainless Steel:

     Inconel 718 (2.4668)

     Inconel 750 (2.4669)

     Nimonic 90 (2.4969)