A rotary mower employing a rubber belt to transfer power from the engine to the cutting blade is a common and often preferred design. This configuration typically involves a pulley system connecting the engine crankshaft to a separate spindle that rotates the blade. This mechanical arrangement contrasts with direct-drive systems, where the blade is mounted directly onto the engine’s output shaft.
This indirect power transmission offers several advantages. The belt acts as a shock absorber, protecting both the engine and blade from sudden impacts with rocks or other hard objects. This cushioning effect can extend the lifespan of these critical components. Furthermore, the belt and pulley setup enables a higher blade speed than what the engine might directly achieve, leading to a cleaner, more efficient cut. Historically, this design has become a staple in the lawn care industry due to its relative simplicity, ease of maintenance, and cost-effectiveness.