Miniature hydraulic cylinders, accumulators and actuators 3

[chootia]

Hello Everyone,

I am working to design a hydraulically powered prosthetic leg and am looking for miniature hydraulic cylinders, accumulators and actuators which can be potentially used in the design. I have searched a lot but could only find large and heavy components with electric drives. I want to use only the components which can be only body powered. Can anyone help me where can I find these? I am new to this forum and apologize for my bad english.

 

[hydtools]

Look at these:

http://www.mackcorp.com/featuredproductrelease/min_hiPressure.html

Ted

 

[unclesyd]

The first two sights have some miniature components. I've never used Hydro-Leduc, but have used Lee many times.

http://www.hydroleducusa.com/

http://www.theleeco.com/LEEWEB2.NSF/Home!OpenPage

If you ever want to consider pneumatics Clippard is good place to start.

http://www.clippard.com/

 

[alansimpson]

Take a look at Festo pneumatic muscle. Maybe there is a hydraulic version.

http://images.google.ie/images?hl=e...&sa=X&oi=image_result_group&ct=title&resnum=4

Although hydraulics have a good power to weight ratio in large systems, in small scale the weight of the structure to withstand the high pressure I think would dominate.

Off the top of my head, metal bellows might be another lead for actuators.

Best of luck

 

[HDS]

another pneumatic option.

http://www.beswick.com/products/product_details.php?pid=199

 

[EdDanzer]

We did some development work about 10 years ago on hydraulic cylinders less than 1” in diameter and found sealing elements were unavailable or very difficult to assemble. We have been looking into making small seals for cartridge valves and cylinders from urethane and nitrile, Currently we are testing some acetal elements up to 15,000 psi.

If you would post the bore size, rod size and stroke it would help. To help with the accumulator knowing the working pressure range and volume is required. You may be able to incorporate the accumulator into the leg structure if round tube is used.

The fluid you chose could impact the seal material choice so you will need to provide that information vendors up front.

Ed Danzer

http://www.danzcoinc.com

http://www.dehyds.com