Basics of Pulley Transmission and Things to Know
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Basics of Pulley Transmission and Things to Know


The choice of transmission and load device technique dictates what type of control system must be used hence it is very important that you get familiar with its mechanical & electrical components of the system.

Gear & pulley drive methods are a bit common ways of transmitting the motion from one source to the end load. Almost everybody will recognize belt & transmisión en poleas systems, without any engineering background. They’re used in daily devices; however they are present in the industrial machines too.

It is very important that you know the major differences between both the systems that will help to design the right repair & maintenance methods and to ensure they stay in the service for long if possible.

What’s pulley?

One commonly seen product is pulley system that is used to move various objects from one end to another, generally in the block-and-tackle set-up and using the wire or rope that is pulled. Let us say, if you have ever gone on zip lining, then you can use such type of system.

Drive Pulleys in the Power Transmission

Pulleys used in the power transmission attain mechanical benefit when a drive pulley has the different diameter compared to driven pulley. Basically, Pulleys moving out energy from one area to another will change its strength and speed by different sizes.

In the basic two-pulley transmission system there’re three options:

  1. A drive pulley is bigger than driven pulley: Driven pulley is a bit faster and has lower torque.
  2. Drive pulley and driven pulley are of same sizes: The torque and speed is same on both the ends. You will just find this type of system when goal is to move power from one area to another.
  3. Drive pulley is a bit smaller than driven pulley: A driven pulley is slower but has higher torque.

The trapezoidal tooth profiles produce little backlash that increases risks of slipping and jumping the tooth under moderate or low torques. Sadly, trapezoidal profile geometries have sharp stress focus at its belt tooth or pulley groove interface, so these will lead to higher belt wear rates in high torque & high speed usage.

Final Words

The standard trapezoidal profile must be adequate for the lower torque transfer use where the small amounts of the backlash won’t cause any kind of significant noise and wear concerns, like the less speed light conveyor.

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