Mounting positions

For some gearbox types and sizes, the mounting position isn’t critical. Due to the size and the gearing arrangement in smaller worm gearboxes, the oil moves freely making its way to all parts that need lubrication – the gears themselves and the bearings. Once we get to bigger worms, and all other gearbox types we sell, the mounting position is vital.

We’ve seen on so many occasions, premature gearbox failure due to the gearbox being supplied for the incorrect mounting position. For in-line gearboxes, either of the vertical mounting positions require far more oil that horizontal due to the upper bearing being outside of the oil bath.

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For planetary gearboxes, when mounted vertically or where very low output speeds are produced, the norm is for an oil expansion tank to be supplied. Once in situ, this tank is fitted into one of the higher plug points with an elbow and the oil topped up to a point within the tank. This ensures the top bearing is always lubricated preventing premature failure.

Bevel helical gearboxes, and bigger worm gearboxes, need special consideration when in vertical and horizontal mounting positions due again to the top bearing. Different companies overcome this in different ways; one of the ways is the use of a nylos ring, which then allows the bearing to have grease applied with the ring holding it in place. There will normally also be a re-greasing nipple on this bearing to allow it to be topped up as and when required.

There is far more detail we could go into here but hopefully you’ve got a little understanding as to the importance of getting the right mounting position for your gearbox type and application. Of course, if you want to know more, get in touch with one of our experts who will be delighted to help.

To discuss your gearbox and motor needs, call STM Team today on 01606-557-200.