Belt idlers

Wheels refer to engine pulleys, also known as fastening wheels, which are used to adjust the tightness of engine belts. Ordinary engines were designed for a long time due to the need for crankshaft traction, such as the linkage between generators, power pumps, and air conditioning pumps, but during this period, due to the sloshing during rotation, the belt slipped, and a fastening wheel was installed in the middle to make the engine belt run more smoothly.