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Orbital valve with thru shaft?

vetteboy79

vetteboy79

It's bent. #ttb
Joined
May 19, 2020
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Morganville, NJ
A friend of mine is looking to build something a bit oddball for one of his tractor pull machines, not sure what exactly, but he's looking for an orbital valve that has a thru shaft out the back side to couple to - something else, I guess. Probably trying to skirt some kinda loophole in the rulebook.

I was trying to 'steer' (lol) him towards a Sweet servo valve or something like that, but he's looking for fixed displacement.

I've never seen such a thing, searching comes up dry...my next guess would be the orbital driven off the steering shaft like a jackshaft.

Just curious if there's some application I may be overlooking. :beer:
 
I don't have the answer for ya, but I'm intrigued trying to wrap my head around the contraption he has in mind. It hasn't clicked for me yet, it feels like mechanical linkage in conjunction with an orbital might be conflicting. Hmm

bdkw1 said:
Inline valve for racks. Sweet makes them, several steering companies also carry them.

Control Valves | Parts Categories | Howe

www.howeperformance.com www.howeperformance.com
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Those look like regular ole servos, I can't think of similar for orbitals
 
AgitatedPancake said:
Hmmm now what the heck are torque generators? They look to have a static claimed displacement like an orbital, and seem still available elsewhere on the net. I wanna see how they work, the same as an orbital? More like a servo?

Torque Generators Archives
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I'm intrigued also. Dunno how they reverse direction with just two ports. But...

jacksonpowersteering.com

John Deere G With Torque Generator - Jackson Power Steering

This is how a Torque Generator will look when installed on a John Deere G. At Jackson Power Steering we have the Torque Generator to give your tractor power steering. Call Roland Jackson for details at 620-357-6546.
jacksonpowersteering.com

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It looks like it's kind of an 'inline' power assist? Like it doesn't feed a ram or anything, just applies rotary power?

Hmm.
 
Char-lynn systems were generally used as retro-fit kits on tractors or other equipment that originally came without power steering. Essentially you would take your non-power steering equipped machine, cut the steering shaft and place the torque generator in and mount a power steering pump to the engine. One high pressure line and a low pressure return was all that was needed.

With the unit in place it basically amplified your inputs and made equipment that didn't have power steering feel like it did have power steering.
 
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Inline power assist makes sense, cool new gadget to learn. Wonder how it does the direction switching.

Though from a few of the products in my last link, it says it provides 760in/lb (63 ft lbs) of torque with 1000psi working pressure, so it's not crazy. But would definitely help with arm pump vs a pure manual setup
 
AgitatedPancake said:
it says it provides 760in/lb (63 ft lbs) of torque with 1000psi working pressure, so it's not crazy. But would definitely help with arm pump vs a pure manual setup
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We have a John Deere A with one and it can be turned with just one finger on the steering wheel with the assist. Without it, it's a both arms to turn kinda deal. Very much the most effortless steering piece of equipment we have. Maybe the pressure is turned up on ours?
eaton-64500-000-rebuild-seal-kit-for-the-eaton-char-lynn-217-1015-002-torque-generators-explod...jpg
 
2big bronco said:
JR4X ... sounds like something you may know, or know enough to steer him in the right direction if we find out his goals.
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I don’t actually. The servos I’ve been using is the correct way but if he wants positive displacement and for the down stream parts to just be rule compliance fillers I don’t know of any parts to make that work.

The 4500 class had some cars doing that with orbit valves but they used two sprockets and a chain to a jack shaft to drive the dead steering parts. I don’t know of any orbit valves that have a through shaft.

The servos I’m using appear like it’s a through shaft. They are actually both input shafts.
 
AgitatedPancake said:
Inline power assist makes sense, cool new gadget to learn. Wonder how it does the direction switching.

Though from a few of the products in my last link, it says it provides 760in/lb (63 ft lbs) of torque with 1000psi working pressure, so it's not crazy. But would definitely help with arm pump vs a pure manual setup
Click to expand...
Kind of cool, but I could see you breaking things down stream. I guess it’s ok for antique tractors.
 
The through shaft ones were used on a lot of 16 cars back before the servos became common. I've seen lots of them on race cars but have never driven one.

Electric does seem much simpler and more options in this case.
 
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