Many customers struggle with gearbox failure due to shaft loads. They don’t account for the load that will be placed on the gearbox shaft, which can cause the bearings to wear prematurely. In this article of STOBER’s Power Tips, we will share 2 simple tricks to improve your gearbox’s ability to handle shaft loads.
Why knowing how much radial, axial, and moment shaft loads is important to sizing a gearbox
When sizing a gearbox, you need to determine how much radial, axial, and moment shaft loads will occur in your application. Some applications exert higher load factors on the shaft. For example, pulleys or belts increase the radial load on the gearbox shaft. If the bearings in the gearbox aren’t rated for higher radial loads, it will put stress on the bearings or gear teeth, resulting in premature wear. It can even break the shaft! Another example is dealing with axial or thrust loads. Thrust loads can put stress on the bearings and seals, causing premature failure.
How failing to account for shaft loads and hurt your reputation
Failure to account for shaft loads can result in poor machine design, which can hurt the OEM’s reputation. For the end user, it can also result in downtime, costing thousands of dollars.
Two simple tricks to preventing shaft load failure with your gearbox
First, ensure the correct service factor is applied to the gearbox ratings. Many companies have fine print on the load calculations. Ratings aren’t the same across all companies. Some companies rate bearings at 10,000 hours or design their rating based on lower RPMs. If you don’t look at the details, you may design a machine based on ratings that don’t fit your application. Make sure you understand how the gearbox is rated before selecting. Second, look for gearboxes that allow you to pick bearing options. This will result in improved shaft load capacity without the need for upsizing to a bigger gearbox.
The difference between STOBER’s Planetary “P Series and Planetary “PH” Series
For example, STOBER allows you to pick single row ball bearings, double row angular contact bearings, or cylindrical roller bearings for our inline planetary “P” Series. Ball bearings are best for normal loads, while double row angular contact bearings are ideal for handling axial or thrust loads, and cylindrical roller bearings are ideal for radial loads. STOBER’s inline planetary “PH” series also has an option for tapered bearings, which are good for radial and thrust loads.
How STOBER’s engineering team can help you deal with shaft loads
STOBER‘s engineering team has extensive experience sizing applications dealing with shaft loads. They will calculate the best service factor and choose the best product for your application. Our breadth of product and knowledge means we will find the solution that will last for years.
Unserpassed Quality, Rapid Response Support, Fast Delivery
“STOBER’s responsiveness is also a key plus. STOBER employees build and ship units in one day and give us quick answers on requests. I can’t think of a better way to meet customer needs.”
– Steve Nelson, Machine Tool Research, Rochester, NY
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