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3-speed TXT with hydraulic steering & diff locks WIP1
Image 202 of 234
Image 204 of 234
Where to start... Mostly Tamiya TXT-1, 3-speed Tamiya truck gearbox mated to original TXT one, home machined UJs to adapt to TMaxx drive shafts, home made heavy duty stub axles/adaptors for 3.3 wheels (Note the posh hub caps!), home made diff lock components including hydraulic operating rams, 4-wheel hydraulic steering, again home made rams, 1-off radio deck & quick release battery holder. Transmitter (Not shown) is Traxxas TQ3 board fitted into stick case & modified to give 4ch operation. Work in progress...
You should be able to see a bit more in the WIP2 pic. I haven't figured out how to put pics in a forum yet & my camera's monkied up at the mo, but as soon as I get a chance I'll do a 'show n tell' on it if you like, probably once I get around to finishing it
I would love to see some detail pics of this in the Forums. It sounds very interesting :-)
Er, yeah, goes something like - servo operates double acting master ram on the radio deck, fluid travels to/from the double acting slave ram on the axle. Each ram has 2 seperate fluid chambers, so they do work in pull & push. Then there's 2 seperate loops for front & rear. The point of the exercise was to get rid of unsightly equipment (Servos) mounted on the detailed axles, whilst at the same time doing something that hasn't (As far as I know) been done before. The diff lock rams are single acting - servo acts on master ram, fluid travels to slave ram & shoves the piston out. A spring returns the piston when the servo releases
So the hydraulic pistons are at one end driven by Servos? I have never thought of that possibility, even though I work in a company making a lot of hydraulic driven machines. (Luckily, I am not a designer ;-) )
It was an interesting project, but I don't think I'd try it again, lots of work involved. What would you like to know? It operates at 1:1 ratio ie the rams are the same size & travel & it's closed loop (No reservoir or pump etc, to keep things simpler). Motive fluid is water, with a few drops of shock oil for lubrication. Rams are double acting (Work in both directions) made of 13mm aluminium. Pistons are also aluminium with double o-ring seals - I wanted proper ram seals, but they're not available at this size. Screw-in end caps & loose shaft seal retainers are phosphor bronze, shafts are silver steel. Er, tube fittings are by SMC, for 3mm nylon tubing, rose joints are Traxxas. Next job is to come up with a bypass valve block for ease of filling/bleedin
g/adjusting steering position etc. Steering is operated by 2x high torque servos with their own power supply. Diff lock rams are single acting, spring return, 6mm aluminium bodies, PTFE pistons & end caps
Cool!! I would love to learn more about the hydraulics.
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