What method is used to calculate the ratio of sheaves in a V-belt drive system?

The method used to calculate the ratio of sheaves in a V-belt drive system involves the diameters of the driven and driver sheaves. This ratio is crucial because it allows for the understanding of how speed and torque will be transmitted through the belt system. Specifically, the diameter of the driven sheave divided by the diameter of the driver sheave provides a direct correlation between the input and output speeds of the system.

In a typical scenario, if the driven sheave is larger than the driver sheave, the output speed will be lower than the input speed, effectively reducing speed while increasing torque. Conversely, if the driver is larger, the system increases speed and reduces torque. This relationship is foundational in designing and analyzing V-belt drive systems for various applications. Therefore, focusing on the diameters gives a clear, measurable way to calculate the gear ratio needed for effective performance.

The other options, while relevant to different aspects of mechanical systems, do not provide a direct and effective method for calculating sheave ratios in V-belt drives. They address concepts related to gears or torque rather than the fundamental relationship defined by sheave diameters.