While I was driving down the road I spotted this 4x4. Kinda cool. No one was around to ask about it,just kinda wandered.............

:D

:D

:D

:D

I've always wanted to build a hydro drive rig.

Receiver hitch:D

Originally posted by Monkeyboy
I've always wanted to build a hydro drive rig.

Me too!

I have no idea what that thing is, but I want one! Thing is bling bling :D

HINT HINT GO BACK AND ASK.. KNOCK KNOCK I WANNA DROOL ALL OVER UR RIG.. AN OH BY HE WAY WHAT IS IT?:flipoff2:

looks like a home grown to me.

hydro drive........i saw that on a construction street sweeper and thought it would be a cool idea......hmmmmmm:smokin:

Hydro is cool and all...but one thing that sucks about it....not easy to adapt to cold climates......basically your up Shiz creek unless you keep it running 24/7 This discussion was brought up in my fluid power class...my teacher used to be a chief engineer for CAT ...and he always stesses that its basically impossible to design a hydro system that can go from a 90+ degree one day to a 10 degree day the next....thats why the auto industry has never gone in that direction. You end up running into major cavitation problems and what not.

Hydro is cool and all...but one thing that sucks about it....not easy to adapt to cold climates......basically your up Shiz creek unless you keep it running 24/7 This discussion was brought up in my fluid power class...my teacher used to be a chief engineer for CAT ...and he always stesses that its basically impossible to design a hydro system that can go from a 90+ degree one day to a 10 degree day the next....thats why the auto industry has never gone in that direction. You end up running into major cavitation problems and what not.


Doesn't the Ford Tonka concept truck use a hydraulic powered drive system on the driveshaft to assist in acceleration? I know this is a very small scale thing compared to powering an entire rig hydraulically, but i thought it was kinda cool.

Hey now,

I have been working on this idea for 4 years now. My buddie was in a Hydro class at Wazzu and we decided all the parts from a Case 589 Tractor (teacher is a farmer as well and recomended this model). Farmers dont fix them when they break, just buy new ones. Broken ones with intack motors and hydro systems can be had for like $1000-$2500 in Eastern Washington. Anyhoo the hydrostatic drive system is pretty straight forward on this model and the parts could be robbed off easy enough.

I was speaking to Cain about it at NWRC at Vantage. We thought up some ideas on how to attach the pumps to each wheel, no diffs so better ground clearance. I am not gonna reveal all the secrets yet, but just wanted to let ya know a few tidbits that have been cumulating for several years.

Fleckster:D

Isn't that the Oscar Meyer Hotdog Mobile? Looks like he lost his wiener. :rasta: :D :p :rolleyes: :eek:

Dan

how does it stop? i only see the "go" pedal. :confused:

maybe the body is from area 51?:bounce:

Originally posted by Omega
Hydro is cool and all...but one thing that sucks about it....not easy to adapt to cold climates......basically your up Shiz creek unless you keep it running 24/7 This discussion was brought up in my fluid power class...my teacher used to be a chief engineer for CAT ...and he always stesses that its basically impossible to design a hydro system that can go from a 90+ degree one day to a 10 degree day the next....thats why the auto industry has never gone in that direction. You end up running into major cavitation problems and what not.

I was a vehicle engineer in the mining vehicle group for CAT for 4 of the 11 years I worked there. We designed vehicles with an ambient cabability of around -30F to 130F, some had a narrower and some a wider range depending on application. The lower extreme temperatures require adding bypass valves to eliminate the cooling cycle until the fluid temperature gets up to a minimum value. In a lot of cases there are 220V heating elements built into the tanks and engines to get them up to temp before the machine starts. There are even artic packages that will run to much lower temps that have diesel fired heaters built in.

I tossed around hydro drive on each wheel with an independent long arm system that eliminates the center diff. Excellent ground clearance and unlimited travel. The only real negative is speed limitations, the complex hydraulics, and extra cooling requirments.

The big hurdle to overcome with the hydrualic system is flow control. With an open system if one wheel spins the other 3 don't move because there is no way to build pressue. You need to incorporate a valve that restricts the flow to the unloaded wheel or wheels to build pressure in the 2 or 3 that are not moving.

Look forward to seeing these hydo rigs.

Originally posted by Daniel
That is cool except the body.. I kinda consider myself an expert on wierd different vehicles and this thing looks hommade... Hydro drive will be seen soon! You heard it here first!

I may have heard it here, but I've seen it already elsewhere!

This is some top secret shiat. I heard that rig is Avalanche's new prototype rock crawling machine. Instead of sniper or raptor they are calling it the brontasaurus. :D

looks like a Landmaster, straight out of Damnation Alley;)

is there no brake? anyways, i don't know anyting about the hydro engine....but paint that thing camo!

Thing could be similar to my hydrostatic driven lawn tractor, you let off the gas and it'll slow down really quick...My guess is you just let off the pedal and it stops fluid control thus stopping/slowing the hydro drive.

Originally posted by lt1yj


The big hurdle to overcome with the hydrualic system is flow control. With an open system if one wheel spins the other 3 don't move because there is no way to build pressue. You need to incorporate a valve that restricts the flow to the unloaded wheel or wheels to build pressure in the 2 or 3 that are not moving.

Look forward to seeing these hydo rigs.

How about 4 subsystems. Pump and motor per driven wheel?

Or independent braking system for each wheel...could be a real PITA to deal with....


No matter what, hydro is gonna be heavy....

There are many ways to achieve flow control. Separate systems is a simple and straight forward solution but has drawbacks. The pumps/motors/wheels/lines would not be exactly the same and would require slippage on high traction surfaces or when turning, etc.

There are commerically available compensating and load sensing valves that can be made to work. I didn't put any effort into developing a system, I just kicked the idea around from a suspension/clearance standpoint.

Looks as if the whole thing is pretty water tight, and designed for amphibious operations..

Love seeing weird shit like that..

Originally posted by jht3
how does it stop? i only see the "go" pedal. :confused:


Probably like any other hydrostatic drive, stop the pumps and roll to a stop. If you need to stop quick like, jam it in reverse.

Originally posted by captain
is there no brake? anyways, i don't know anyting about the hydro engine....but paint that thing camo!

I've driven a lot of hydrostatic equipment on the golf course where I used to wrench.
If you want to stop you let off the pedal and you stop but like BornInAJeep said if you need to stop fast you jam it in reverse. We used to stand the greensmowers ontheir nose by doing this.:D
Hydrostatic drives don't "coast". Ever try to push a hydrostatic garden tractor without disengaging the trans? They don't move!

HA!
check this out!

http://www.snowcrest.net/fox/landmaster/