Finding a Suitable Rotary Actuator for Wheelchair Ramp

[recreated]

Can someone please help in finding a suitable rotary actuator?

I need it to lower the rear wheelchair ramp of a car. So the motor would attach directly to a shaft. When it causes the shaft to rotate it would lower the ramp which is welded onto the shaft. I'm finding it hard to find a rotary actuator that produces the 166N m of torque which is required. Any ideas? Or prehaps different mechanisms?
Thank you

 

[timthereaper]

Gear systems will help you with the torque problem. Although you might not have a heavy-duty motor, consider using a small gear to drive a large one. Based on the equations of mechanical advantage, a small motor with a high velocity and low torque can cause a large gear to produce high torque and slow rotations, which is most likely what you want.

Without knowing any specifics on how you want to design the system, consider using a worm gear system if you're trying to convert a shaft motion to another type of rotational motion.

 

[recreated]

Thank you, will uncover abit about worm gears and other gearing systems.

 

[pantaz]

If this is just for a personal project, try industrial surplus stores for gears, motors, actuators, etc.

 

[OCR]

Rotary Actuator:

Can someone please help in finding a suitable rotary actuator?

I have modified these for various non-winching applications... or, could your lift ramp be modified to use a winch, similar to an elevator?

They are fairly inexpensive and powerful.

http://www.superwinch.com/p/lt2000-2-000-lbs-12v?pp=12
http://en.wikipedia.org/wiki/Elevator#Capacity

http://en.wikipedia.org/wiki/Worm_drive

http://en.wikipedia.org/wiki/Rack_and_pinion

http://vanconinc.com/equipment/wheelchair-lifts/OCR

 

[recreated]

That could be great,, I did think of using a motor attached to steel cable but didn't consider a wrench because i got rid of the idea but will start again. Could def be a great idea
Thank you

 

[recreated]

Thank you Pantaz. I don't think it will be a suitable place for me. i have looked and book marked the site, could be very useful anyway

 

[OCR]

Rotary Actuator:

I did think of using a motor attached to steel cable but didn't consider a wrench

I have modified these for various non-winching applications...

Actually recreated, what I did as a "modification" was to just remove the cable and fit a

sprocket and chain to the drum.

The chain drove a rack and pinion, which opened and closed the gates of a grain trailer.


I basically used the winch as a rotary actuator to drive a linear actuator.



OCR

 

[Samuel Denson]

according to my experience all of these rot. actuators http://www.festo.com/cat/en_us/products_010500 work good with mini tubes (like this one http://www.progressiveautomations.com/linear-actuator) as great motion system. I can upload some pics if interested

 

[NascentOxygen]

Hi Samuel Denson. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

The last responses to this thread are from over two years ago. If there is still a need for a rotary actuator then I'm sure your recommendation will be much appreciated.

Thanks for posting.