Reduction Gearboxes

Electric cars, trucks, ATVs, NEVs - things bigger than a motorcycle.
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tentman
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Reduction Gearboxes

Post by tentman » Mar 16, 2018 7:43 pm

Hello Folks

I'm looking for a suitable gearbox for a high torque (at least 100N/m per axle) low output speed (or high reduction ratio) gearbox for a tracked vehicle.

I've seen these ones - can anyone identify them or know of similar gearboxes?

http://www.alamo-industrial.com/Product ... unner7.jpg

The Alamo is on brushed motors (?) so the reduction is not as great as that required for brushless??

Thanks

Hillhater
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Re: Reduction Gearboxes

Post by Hillhater » Mar 16, 2018 8:07 pm

tentman wrote:
Mar 16, 2018 7:43 pm
The Alamo is on brushed motors (?) so the reduction is not as great as that required for brushless??

Thanks
The reduction needed depends on the motor operating speed range, which itself depends on its electrical design specifications, and operating voltage. Its not dependent on brushed or brushless.
Some brushless motors have a maximum speed of 500 rpm ,..or less .
And some are 50,000rpm !
Select your motors, then find suitable gearbox(s)
This forum owes its existence to Justin of ebikes.ca

tentman
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Re: Reduction Gearboxes

Post by tentman » Mar 16, 2018 9:35 pm

I sorta figured that, but finding the right torque rating seems to be the hardest part (most are not strong enough). The motors of the appropriate power (1.5-2.0 kw) that I've been looking at are around 4000 rpm mark. From what I've seen once I find something with suitable torque ratings I can specify the reduction I want within quite a wide range.

Here's the design parameters:

Payload of 250 Kgs (550 lbs)
Climb capacity 30% (17 degrees) and ability to climb over ruts and
obstacles of 150mm (6")
Ground clearance 200 mm (8")
Width 900mm (36")
Length 1500mm (5') (with ability to take overhangs)
Range 5 Km (3 miles) (by another measure, able to work an 8 hour day
on about 20-30% duty cycle)
Top Speed 10Km/h (6 mph), full loaded speed of 4 Km/h (2.5 mph)
Platform height of 450mm or lower (18")
Tare weight 180 Kgs (400 lbs) less would be better

I want to use mainstream industrial componentry (reliability and parts availability are more important than light weight etc)

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Dauntless
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Re: Reduction Gearboxes

Post by Dauntless » Mar 16, 2018 10:28 pm

https://endless-sphere.com/forums/viewt ... 28&t=70099

https://endless-sphere.com/forums/viewt ... 28&t=92772

Two threads dealing with the dilemma. My problem is I have 6 -6.5kw out runners I'd expect to run at 11,000rpm, but I haven't found anything that wants to run at over 3,000.
Any sufficiently advanced technology is INDISTINGUISHABLE FROM MAGIC!
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craneplaneguy
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Re: Reduction Gearboxes

Post by craneplaneguy » Mar 16, 2018 10:31 pm

www.surpluscenter, worth a looksee.

Hillhater
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Re: Reduction Gearboxes

Post by Hillhater » Mar 16, 2018 10:51 pm

tentman wrote:
Mar 16, 2018 9:35 pm
I sorta figured that, but finding the right torque rating seems to be the hardest part (most are not strong enough). The motors of the appropriate power (1.5-2.0 kw) that I've been looking at are around 4000 rpm mark. From what I've seen once I find something with suitable torque ratings I can specify the reduction I want within quite a wide range.
Remember , electric motors develop max torque from zero rpm, so dont focus on the max speed range.
Find a motor with 10 Nm output torque , and a simple 10:1 reduction will give the axle torque you want.
Then max rpm is only relavent for max wheel(track) speed...determined by the motor controller .
Also, your required axle torque will vary depending on your final road (track drive) wheel diameter.
This forum owes its existence to Justin of ebikes.ca

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Dauntless
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Re: Reduction Gearboxes

Post by Dauntless » Mar 17, 2018 12:50 am

https://www.surpluscenter.com/

Well, there's the motor, except mine aren't Turnigy.

So the $1,000 experiment I could conduct would be a minimum order of 5 of either of these. They say they're ready to run 12,000rpm, no mention of HP or Watts limit, but at 100n.m. output I'd think they should handle under 10hp pretty well.

https://www.engineeringtoolbox.com/elec ... _1503.html

https://ncalculators.com/electrical/hor ... ulator.htm

Then I'd have to figure the hookup. THERE would be an interesting exercise to get people here commenting on.

https://lectstyle.en.made-in-china.com/ ... 00rpm.html

https://lectstyle.en.made-in-china.com/ ... ducer.html

Image
Any sufficiently advanced technology is INDISTINGUISHABLE FROM MAGIC!
- Arthur C. Clarke

tentman
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Re: Reduction Gearboxes

Post by tentman » Mar 17, 2018 7:47 pm

Hillhater wrote:
Mar 16, 2018 10:51 pm
tentman wrote:
Mar 16, 2018 9:35 pm
I sorta figured that, but finding the right torque rating seems to be the hardest part (most are not strong enough). The motors of the appropriate power (1.5-2.0 kw) that I've been looking at are around 4000 rpm mark. From what I've seen once I find something with suitable torque ratings I can specify the reduction I want within quite a wide range.
Remember , electric motors develop max torque from zero rpm, so dont focus on the max speed range.
Find a motor with 10 Nm output torque , and a simple 10:1 reduction will give the axle torque you want.
Then max rpm is only relavent for max wheel(track) speed...determined by the motor controller .
Also, your required axle torque will vary depending on your final road (track drive) wheel diameter.
Thanks HH, I've been playing with a robotic motor simulator and I have a much better understanding of that now. I'm a slow learner . . . .

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