Why are centrifugal clutches used?

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Centrifugal clutches are used on automated tools with small engines, as well as on mini vehicles, allowing the engines in these machines to idle without dying.

Uses

Instruments that commonly use centrifugal clutches include chainsaws, some lawnmowers and small recreational vehicles like go-carts and minibikes. Centrifugal clutches afford manufacturers a cheap way to allow their tools to be easily used.

Benefits

The major benefits of centrifugal clutches are their low production costs and ease of use. Because they operate automatically, there is no need for an engaging linkage or control mechanism.

Limitations

There are two major drawbacks to centrifugal clutches. They are not appropriate for transferring large amounts of torque and tend to slip. Also, they do not always engage or disengage properly.

How They Work

The output is driven by flyweights connected to the input mechanism activated by the engine. As the engine revs and the rotation speed increases, the flyweights drive the output drum and move the mechanism. As engine speeds idle, the flyweights drop and cease propelling the mechanism.

Safety

Centrifugal clutches cannot be relied upon to stop an engine, and the engine itself must be shut off before anything is done to the mechanism driven by the engine. Also, centrifugal clutches are dangerous if an attempt is made to run them when they are not fully assembled.

Source:

Louisiana State University: Centrifugal Clutches for Small Engines

More Information:

Go Kart Supply: Clutches

Heeters: Kart Clutches

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