Relatively inexpensive 25:1 for 1 hp motor

[aj7897]

Hey all,

I'm building a prototype of a new product and I need to reduce the speed of a 5400 RPM, 1 hp brushed DC motor by a ratio of 25:1. It needs to be bi-directional (i.e. no worm gears). I found a 25:1 two-stage planetary gearset from QC Gears with an appropriate torque rating, but it costs over $800. I'd like to do it for significantly cheaper, if possible. That price would ruin the target price of the product. For reference, my first prototype iteration used a 5000-lb winch with a 1 hp motor and a 3-stage planetary gearset that cost $200 total on Harbor Freight.

In addition to planetary gears, I was also considering using a toothed belt for the first stage and spur gears for the second stage. I also might consider contacting automotive drivetrain manufacturers, since they manufacture helical planetary gearsets that are much cheaper than industrial power transmission (although potentially harder to integrate).

Any recommendations?

Thanks,
Andrew

 

[MikeHalloran]

Some HF stuff is okay, but I wouldn't use it as a yardstick.

What I'd do now is drag out my Browning catalog and start looking at alternatives.
For two stages, you need a jackshaft, and some structure to hold it. That may change with the ratio split you select.

For the amount of reduction you're looking at, I might consider a chain drive for the second reduction, and maybe a poly-V belt for the first. You definitely need an automatic tensioner for those belts.

Of course at 1HP you could probably do both stages with toothed belts and get to basically zero maintenance. ... and no tensioners if you use relatively coarse teeth and slightly tight tolerances on the center distances and allow axial assembly.





Mike Halloran
Pembroke Pines, FL, USA

 

[MikeHalloran]

Oh.
I almost forgot.
The cheapest alternative may be to call Bodine and have them build the exact gearmotor you need, and deliver it ready to install.



Mike Halloran
Pembroke Pines, FL, USA