Full definition
A driven pulley is a crucial component in a belt drive system, serving as the pulley connected to the load or the machine that is being driven. Unlike the driver pulley, which receives power from the motor or engine, the driven pulley is responsible for transmitting that power to the load. In many applications, particularly in speed-reduction drives, the driven pulley is designed to be larger than the driver pulley. This configuration allows the driven pulley to rotate at a lower RPM while delivering a higher torque output, which is essential for applications requiring significant force. The relationship between the diameters of the driven and driver pulleys directly influences the drive ratio, denoted as i = D_driven/D_driver. This drive ratio is a critical factor in determining the performance and efficiency of the drive system.
The wrap angle of the driven pulley is a key consideration, as it is typically greater than or equal to the wrap angle of the driver pulley in a two-pulley setup. This characteristic often means that the driven pulley is not the limiting factor for traction capacity, allowing for efficient power transmission. When designing a belt drive system, it is essential to use the pitch diameter of the driven pulley rather than its outer diameter for calculations involving belt length and overall drive configuration. The proper selection and sizing of the driven pulley can significantly impact the operational effectiveness of the machinery it drives.
Common applications for driven pulleys include various industrial machines such as pumps, fans, compressors, conveyors, crushers, and mixers. These machines rely on the driven pulley's ability to convert the rotational movement from the driver pulley into effective work. For example, in a pump system, the driven pulley transmits power to the pump impeller, enabling fluid movement. Similarly, in a conveyor system, the driven pulley plays a pivotal role in moving materials along the conveyor belt efficiently. Understanding the specifications and operational parameters of driven pulleys is essential for engineers and maintenance personnel involved in the design and upkeep of industrial machinery.