Helical gears are the next evolutionary step from Spur Gears. If you ran the smaller spur gear there would be less speed transferring to the bigger spur gear but the torque would be greater. If you were to drive the large spur gear, the smaller one would revolve much faster meaning that there would be a torque reduction and a speed increase on the other spur gear. They can be quite noisy to operate and the stress on the gears can be destructive if too much force is applied.īelow, picture of a Spur gear set. While spur gears and common and cheap to buy, they aren't always the best solution, especially where high torque or speed is required. Generally it takes many spur gears to make large reductions and space is always a limiting factor when designing these. They have straight teeth that mesh with other spur gears to reduce speed and increase torque or increase speed and decrease torque or change rotational direction. Spur gears are straight cut gears intermeshed together to form the gearbox. These are the simplest gearbox to make and so is the most common and cheapest to manufacture.

The most common type of gearbox is a standard spur gear configuration. Have you ever noticed the tools that are made for tightening the biggest nuts have the longest handles? Overall that's a pretty simplified way or looking at things, but gives you a pretty good feel for how a gearbox works. The further the leverage point is from the source, the greater amount of torque can be transmitted with the force you apply. You can consider a gearbox to be a small box of levers. A gearbox turns that high speed and low torque into lower speed and higher torque via a term labelled 'Mechanical Advantage'. While this speed can be useful, often there's no practical use to make use of the high speed and low torque without some form of reduction to make the torque greater and the rpm lower, that's where the gearbox is useful. In general terms AC motors have outputs of around about 1250-1500 rpm (4 pole or up to 3200 RPM 2 pole), where as DC motors will give an output of anywhere between 15 rpm to 30,000rpm depending on the type of motor it is. Below we describe some of the common Gear motors available and give you list of their strengths and weaknesses. What Gear motor is suitable for you depends on your particular application, each gearbox type has its own advantages and disadvantages.

In the simplest term, a gearbox is basically a way or increasing or decreasing motor speed, torque and even direction. Time and time again we are asked to explain the differences between gearbox types and why gearboxes are needed. Gearboxes, do I need one and which type is best for my application?

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