working hydrolic steering!

[Rider385]

okay! please dont flame this up... i'm just a kid with ideas.

so!... how in the hell is this gonna work? well believe it or not, no pumps neither tanks. the only bad thing is that its mostly for large rigs.

today at school we are doing hydrolics and pneumatics (i hope thats how you say it in english) basics. when the teacher said "a hydrolic linear actuator is exactly like a truck shock but the piston is closed" i went !!!

ok lets take rc shocks and fill the holes in the piston and drill and tap for fitings. blow! you have hydrolics actuators!!

ok but how do i make those move? i need pressure and flow...

then i though about this other guy's in here idea (kamikase) use an actuator to move fluids into an other one. but that does nothing, it acts like a moving rod or like a bicycle brake line, transfer mechanical forces.

what we are looking for is more power than the servo is giving you. the key word is surface.

if you move a piston in cylinder displacing fuild with 1cm2 in one with 2cm you'll have twice de force but half the the displacement. use a main cylinder twice the length you need your slave one to move to make lock to lock steering.

i'll tell you a secret, use savage shocks to move lst shock

i'll do it if i think its worth the money so look at this you could do it too its simple.

['83 chevy]

the guy who owns my lhs tried that same idea, its extremely hard to get the pistons to seal, and also it was hard to bleed out the air. so he tossed it

['83 chevy]

Originally Posted by M715ForLife

All you would do is pull the front tires together like this \ /

he means the he would still use a tie rod between the 2 hubs, and use one cylinder per axle. just like what you would do with a servo, attach one end to the hub, and the other mounted to the axle.

[k9popo]

I think JIA has already done it...search around i believe it is his scorpion build...

[HndsWthtShdws]

Thats exactly what Kamikaze is doing...............

[Reflection]

Originally Posted by HndsWthtShdws

Thats exactly what Kamikaze is doing...............

No,Kamikaze's set up differs from this idea and JIA's set up.

[Robb]

How is this "working" if it is just an idea?

And not an original one by any means............

[ToyTundra]

Originally Posted by '83 chevy

he means the he would still use a tie rod between the 2 hubs, and use one cylinder per axle. just like what you would do with a servo, attach one end to the hub, and the other mounted to the axle.

with only one cylinder per axles, the truck would have different steering forces in the right and left direction. This is because when the cylinder extends, the pressure is applied over the full piston area, but as it retracts, the pressure is applied over the piston area minus the cross sectional area of the shaft, resulting in less force.

Actual hydraulic cylinder specs:
bore.....stroke.....extend force.....retract force
14mm...50mm......138 N..............113 N

['83 chevy]

Originally Posted by ToyTundra

with only one cylinder per axles, the truck would have different steering forces in the right and left direction. This is because when the cylinder extends, the pressure is applied over the full piston area, but as it retracts, the pressure is applied over the piston area minus the cross sectional area of the shaft, resulting in less force.

Actual hydraulic cylinder specs:
bore.....stroke.....extend force.....retract force
14mm...50mm......138 N..............113 N

ya your right but he said its only an idea so it wasnt definete. IMHO i think this hydraulic steering setup is gettin way too complicated in an already complicated hobby

[Rider385]

'83 chevy, thaks dude you save me time by answering all people who think wrong.

Originally Posted by ToyTundra
with only one cylinder per axles, the truck would have different steering forces in the right and left direction. This is because when the cylinder extends, the pressure is applied over the full piston area, but as it retracts, the pressure is applied over the piston area minus the cross sectional area of the shaft, resulting in less force.

Actual hydraulic cylinder specs:
bore.....stroke.....extend force.....retract force
14mm...50mm......138 N..............113 N


i know that... i said i was in a hydrolic cours at school... and beleive me I aint sleeping.

[Rider385]

Originally Posted by '83 chevy

the guy who owns my lhs tried that same idea, its extremely hard to get the pistons to seal, and also it was hard to bleed out the air. so he tossed it

i'll block the holes in it with alen key plugs. if the contour leaks i'll try teflon tape and use oil ok for teflon.

[Kamikaze]

That is easy to overcome with a double ended cylender like this.

[Rider385]

Originally Posted by Robb

How is this "working" if it is just an idea?

And not an original one by any means............

do you have one on your rig? ...

by ''working'' i meant it will work its not just a scale accesory.


well i hope it will be working...


attention to all!! i need to know how much fuild can a lst shock contain. if you have one, could check that out for me

['83 chevy]

ive read somewhere thst it takes as much oil to fill one LSt shock as 3 regualur 4 in. ones

[rustler421]

i would be a good idea just gonna be extemely hard

[HndsWthtShdws]

Kamikaze is doing the same thing with double acting cylinders.....happy now? Hes still using different ID pistons. If you read his thread you will notice he is multiplying his torque for speed, exactly what your trying to do.

[Kamikaze]

Actualy I am using the same dia cylinders, but the master has a longer stroke to make it easier to blead and center, all the torque multiplication in my setup is in the rack and pinion system.

[Harley]

I modeled a system similar to that in Cosmos which is an add on to Solidworks 2007. Using a servo to actuate the cylinder still requires alot of force. To be able to get as much throw as you need to turn lock to lock, do it in a reasonable amount of time, have enough torque at the knuckles to turn the wheels even when it is on the rocks requires a hell of a servo.

I did quite a bit of modeling on a couple of different systems. Have some of the info in a thread on here, I will dig it up.

Innovation is a wonderful thing but...........most of the rigs that win comps use the old K.I.S.S technique (keep it simple stupid).

For a scale rig it could look cool, thats what I was going for in my design. But I realized that it would be easier to make it look like I was trying to do it with hyraulics and actually do it cable operated.

Here is the link: Pictures are on page two
New scale "Hydro style" steering on a budget

[HndsWthtShdws]

Ok I gotcha, I thought you were using same stroke and different diameters. Either way same result.

[RPP Hobby]

I too was going to do a hyd setup. Here are some cylinders I have. Looks like they could be used no problem, just fab up some brackets. I am not sure if I am going to keep going with it though.