Outer Limits 4x4 Board

RaginRover wrote:

GaryInOz wrote:

Shadow wrote:would a chain drive require less engineering?

obviously it wouldnt be good at speed

but if its just for a buggy, perhaps it wouldnt matter

i have seen chain drive on rollers and other heavy equipment, and they dont look very technical at all, no where near as technical as that picture above.

If you could use the chain from a chain drive tcase and machine up a couple of new drive gears for it, it may be a possibility. Should be strong enough, and the speed shouldn't worry it too much. Only minor problem would be keeping everything cool, may need a small electric pump wired up to circ oil to a oil cooler.

Don't know how much chains are out of other tcases but the ones in the rover tcases are worth $1500 ish secondhand last time I priced one.

Tom

I reckon patrol ones would be cheap enough as well as plenty strong enough for a ~2:1 reduction, even if you bought a second hand tase for the chain alone (should be a few around from ppl that are doing double tcases). They use one of them to handle the torque to two front wheels, so a 2:1 reduction shouldn't stress them too much on each end of an axle.

GaryInOz wrote:

Shadow wrote:would a chain drive require less engineering?

obviously it wouldnt be good at speed

but if its just for a buggy, perhaps it wouldnt matter

i have seen chain drive on rollers and other heavy equipment, and they dont look very technical at all, no where near as technical as that picture above.

If you could use the chain from a chain drive tcase and machine up a couple of new drive gears for it, it may be a possibility. Should be strong enough, and the speed shouldn't worry it too much. Only minor problem would be keeping everything cool, may need a small electric pump wired up to circ oil to a oil cooler.

was thinking just having oil covering about 50% of the bottom gear, the chain would throw the opil around like a washing machine

but temperature might be an issue.

ToNkA wrote:

spazbot wrote:do a search on pirate they are talking bout some bolt on ones atm think the price was around 8k USD

Even better ask this question on pirate and make sure you mention you are new!

You very bad man Jerry

I would suggest that getting gears machined would be cheaper and simpler in the long run than chains and getting the gears niharded would be ok for strength and wear.....heat wise would prolly need to add an external cooler. the main thing would be keeping the strength on the outer casing but it would be fairly cheap to pattern up the case and get cast in SG iron for the added strength thenm if you have all the machinery you would be ok but I would be wanting CNC mills etc

These buggies have a different type of chain drive, pretty shithot i reckon .

Check these out .

http://www.chaindriverails.com/indexcon.htm

Cheers

Nice ground clearance

Tyres look mean too

ToNkA wrote:

spazbot wrote:do a search on pirate they are talking bout some bolt on ones atm think the price was around 8k USD

Even better ask this question on pirate and make sure you mention you are new!

Cruel Man but i like it

i always thought Hummers had portal axles

De-lux wrote:i always thought Hummers had portal axles

H1's do, H2's and the new H3's don't.

GaryInOz wrote:

De-lux wrote:i always thought Hummers had portal axles

H1's do, H2's and the new H3's don't.

They aint really a portal as such, more of a step down system...

ToNkA wrote:

GaryInOz wrote:

De-lux wrote:i always thought Hummers had portal axles

H1's do, H2's and the new H3's don't.

They aint really a portal as such, more of a step down system...

And the difference is...?

NJ SWB wrote:

ToNkA wrote:

GaryInOz wrote:

De-lux wrote:i always thought Hummers had portal axles

H1's do, H2's and the new H3's don't.

They aint really a portal as such, more of a step down system...

And the difference is...?

The name???? bloody yanks have do every thing different

GaryInOz wrote:

De-lux wrote:i always thought Hummers had portal axles

H1's do, H2's and the new H3's don't.

thread hi-jack.... anyone got any pics or specs for this new H3?

Toyota call them reduction hubs, as fitted to the mega cruiser.

TROLL


Bazzle

Shorty40 wrote:Nice ground clearance

Tyres look mean too

are they krawlers with every second lug cut out?

UZJ40 wrote:Toyota call them reduction hubs, as fitted to the mega cruiser.

Kenworth call them that too

GaryInOz wrote:

RaginRover wrote:

GaryInOz wrote:

Shadow wrote:would a chain drive require less engineering?

obviously it wouldnt be good at speed

but if its just for a buggy, perhaps it wouldnt matter

i have seen chain drive on rollers and other heavy equipment, and they dont look very technical at all, no where near as technical as that picture above.

If you could use the chain from a chain drive tcase and machine up a couple of new drive gears for it, it may be a possibility. Should be strong enough, and the speed shouldn't worry it too much. Only minor problem would be keeping everything cool, may need a small electric pump wired up to circ oil to a oil cooler.

Don't know how much chains are out of other tcases but the ones in the rover tcases are worth $1500 ish secondhand last time I priced one.

Tom

I reckon patrol ones would be cheap enough as well as plenty strong enough for a ~2:1 reduction, even if you bought a second hand tase for the chain alone (should be a few around from ppl that are doing double tcases). They use one of them to handle the torque to two front wheels, so a 2:1 reduction shouldn't stress them too much on each end of an axle.

the transfer case chain has far less torque as its speed is higher before the diff pinion. every time you halve your rpm you double your torque

that said you can use the nissan chain section as the case breaks into 3. run the axle to what was formerly the front drive, then the wheels can bolt onto a stub axle supported by a bearing either side of the chain. either make steel support frames like a dual case crossmember or build a new housing i will look on friday as i have a split nissan case at work

bru21 wrote:

GaryInOz wrote:

RaginRover wrote:

GaryInOz wrote:

Shadow wrote:would a chain drive require less engineering?

obviously it wouldnt be good at speed

but if its just for a buggy, perhaps it wouldnt matter

i have seen chain drive on rollers and other heavy equipment, and they dont look very technical at all, no where near as technical as that picture above.

If you could use the chain from a chain drive tcase and machine up a couple of new drive gears for it, it may be a possibility. Should be strong enough, and the speed shouldn't worry it too much. Only minor problem would be keeping everything cool, may need a small electric pump wired up to circ oil to a oil cooler.

Don't know how much chains are out of other tcases but the ones in the rover tcases are worth $1500 ish secondhand last time I priced one.

Tom

I reckon patrol ones would be cheap enough as well as plenty strong enough for a ~2:1 reduction, even if you bought a second hand tase for the chain alone (should be a few around from ppl that are doing double tcases). They use one of them to handle the torque to two front wheels, so a 2:1 reduction shouldn't stress them too much on each end of an axle.

the transfer case chain has far less torque as its speed is higher before the diff pinion. every time you halve your rpm you double your torque

that said you can use the nissan chain section as the case breaks into 3. run the axle to what was formerly the front drive, then the wheels can bolt onto a stub axle supported by a bearing either side of the chain. either make steel support frames like a dual case crossmember or build a new housing i will look on friday as i have a split nissan case at work

Forgot about that bit