Belt drives are widely used systems for transmitting rotary motion and power between shafts using pulleys and flexible belts. They are valued for their simplicity, quiet operation, and ability to absorb shock loads. Depending on the design, belt drives can rely on friction or positive engagement, making them suitable for a wide range of industrial and automotive applications.
Belt drives are mechanical systems that transmit power between shafts using belts and pulleys. They are commonly used due to their simplicity, low cost, quiet operation, and ability to absorb shock and vibration.
A belt drive is a method of transferring rotary motion between two shafts. A belt drive includes one pulley on each shaft and one or more continuous belts over the two pulleys. The motion of the driving pulley is, generally, transferred to the driven pulley via the friction between the belt and the pulley. Synchronous/timing belts have teeth and therefore do not depend on friction. Belt drives and gear transmissions have a much greater life expectancy than belt drives. Belt drives also have relatively high inspection and maintenance demands
For belt drives, other than synchronous drives, the belts will slip in a high
overload event providing a certain measure of safety.
The belts transferring torque by surface friction need to be in tension.
This results in the need for adjustable shaft centres or using tensioning pulleys
Note: More details and pictures of all belt types below are to be found at the links below table
| Belt Type | Description | Notes |
| Flat | Belt transfers torque by friction of the belt over a pulley. Needs tensioner. Traction related to angle of contact of belt on pulley. Is susceptible to slip. Belt made from leather, woven cotton, rubber, balata. | Flat Belts |
| Vee | Better torque transfer possible compared to flat belt. Generally arranged with a number of matched vee belts to transmit power. Smooth and reliable. Made from hi-text woven textiles, polyurethane, etc. | Vee Belts |
| Poly-Vee | Belt is flat on outside and Vee Grooved along the inside. Combines advantages of high traction of the Vee belt and the use of only one belt. | |
| Timing/ Synchronous |
Belt toothed on the inside driving via grooved pulleys. This enables positive drive. Limited power capacity compared to chain and Vee belt derivatives. Does not require lubrication. Extensively used in low power applications | Timing Belts |
| Vee Link Belts | Linked belts that can be used in place of vee belts. Advantage that the length can be adjusted and the belt can be easily installed with removing pulleys. Expensive and limited load capacity. |
A belt drive is a system that transfers power between rotating shafts using belts and pulleys, typically through friction or toothed engagement.
Common types include flat belts, V-belts, poly-V belts, and timing (synchronous) belts.
Friction-based belt drives can slip under high loads, but timing belts are toothed and provide a positive drive without slip.
Belt drives are used in machinery, vehicles, HVAC systems, and general power transmission applications.
Links to Belt Design
|