Motor gearboxes...basic questions.
Motor gearboxes...basic questions.
(OP)
Questions concering electric motor gearboxes...
1. Are there direct relationships between ratio, speed and torque? I just installed an electric drive. The torque spec on the basic drive (W/O gearbox)is given as 225 ft/lbs and the spec for the entire assembly is 2250. The gearbox is clearly stamped 50:1. Does gearing down not directly multiply torque, or is there a typo somewhere? The gearbox provides a 90 deg. direction shift.
2. What is significant about "double-reduction" gearing? Is it a reference to internal arrangements or is there a performance difference? For example,in terms of output speed and torque will the end result be the same for a "standard" 10:1 gearbox and a 10:1 double-reduction gearbox?
Thanks in advance,
DG
1. Are there direct relationships between ratio, speed and torque? I just installed an electric drive. The torque spec on the basic drive (W/O gearbox)is given as 225 ft/lbs and the spec for the entire assembly is 2250. The gearbox is clearly stamped 50:1. Does gearing down not directly multiply torque, or is there a typo somewhere? The gearbox provides a 90 deg. direction shift.
2. What is significant about "double-reduction" gearing? Is it a reference to internal arrangements or is there a performance difference? For example,in terms of output speed and torque will the end result be the same for a "standard" 10:1 gearbox and a 10:1 double-reduction gearbox?
Thanks in advance,
DG
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RE: Motor gearboxes...basic questions.
Double reduction gearing means there are two meshes ( 4 gears. As most parrallel axis and bevel gearbox single reductions are usually 5 or 6/1 then for a 10/1 unit it would probably be a double reduction and for 50/1 I would expect a triple reduction. The bigger the single ratio, the smaller (relatively) the pinion shaft so it bends more, that's usually the reason to keep it low.
The differences will be the cost and the efficiency, say 97% per mesh.
If you have a large ratio with only two reductions it's possible you have a worm box. The efficiency of these is a lot less but you will get the big ratio in less stages.
RE: Motor gearboxes...basic questions.