Outer Limits 4x4 Board

was looking at yuri's cruiser on the weekend at werock, and he was running reduction hubs on the ends of the diff. anyone know how these work, wat sorta reduction they achieve, what sorta $$$'s etc. it had a super low crawl ratio

haven't seen this truck, but at a guess these would be planetry reduction hubs. alot of tractors and backhoes have them. in the 60's landrover built a 109inch wb s11a with this set up final drive of axles was 13-1. it had 52 inch tall tractor tyres. it was built for forestry to be able to climb over fallen trees.

serg

that could be them........13:1

Antt, a number of people have used planetary hubs over the years, including a lot of Mercedes highway trucks.

Sam Xeureb, who now runs the "Sampson" Monster truck was a champion mud racer back inthe day, and ran allison truck automatic planetry sets in his 40 series hubs. They made a very impressive noise.

Glen Dobbins car uses planetry hubs too, but he set them up so he drives into one of the counter gears so he gets a drop as well as reduction.\

They are a very good way to go, but do make for bulky, heavy hubs (bad for unsprung weight) and much of teh tracrtor stuff is not made of high enough steel to be road usable.

Steve.

anyone have a pic of the insides?

i'm picturing a small gear driven by the axle in the centre, 3-4? smaller gears around this, then a larger internal gear around the outside that drives the wheel.

seems like a good setup if its half strong. reduces wear on the drivetrain, provides reduction, could be made bolt on? saves buying wheel spacers?

antt wrote:was looking at yuri's cruiser on the weekend at werock, and he was running reduction hubs on the ends of the diff. anyone know how these work, wat sorta reduction they achieve, what sorta $$$'s etc. it had a super low crawl ratio

hi antt best to talk to damo him self ,i'll pm you his mobile

Damo's are 3:1

beebee wrote:Damo's are 3:1

cool, what r&p ratio as this will give his final axle ratio

cheers, serg

beebee wrote:Damo's are 3:1

Anyone know who makes them or what the specs are. I have been looking for decent reduction hubs that aren't too heavy.

ISUZUROVER wrote:

beebee wrote:Damo's are 3:1

Anyone know who makes them or what the specs are. I have been looking for decent reduction hubs that aren't too heavy.

apparently he made em himself

not sure if this is what you'se want - check about six lines from the bottom

http://www.marks4wd.com/news.html

for your time and money dont bother unless you have big size you cant fit the smaller gears in there not strong enough used to change heaps on every machine i,ve ever worked on with redution hubs and they hate shock loading destroys the smaller gears and one chip and it takes out the inner outer gear face and all the internals when sam ran em on his 40 in mud he had to stop jumping the truck just broke stuff all the time

AndrewPatrol wrote:not sure if this is what you'se want - check about six lines from the bottom

http://www.marks4wd.com/news.html

I saw this in there new products listing
New portal axle conversion for Nissan and Land Cruiser. (Coming soon)

wanna wrote:for your time and money dont bother unless you have big size you cant fit the smaller gears in there not strong enough used to change heaps on every machine i,ve ever worked on with redution hubs and they hate shock loading destroys the smaller gears and one chip and it takes out the inner outer gear face and all the internals when sam ran em on his 40 in mud he had to stop jumping the truck just broke stuff all the time

The Land Rover (roadless) that ran them didn't have any problems with this. But they only ran a 70Hp engine. And there are plenty of trucks out there that run them.

the smallest ones that are commen the reduction hob is about 280mm in diameter and shock loads destroy them used to work in timber industry allmost every machine with big tyres uses em work great but as soon as there shock loaded i make good money relacing em bring on the ot

Wanna - what are these smallest common reduction hubs used in? Any idea what a complete hub weighs and what they cost?

This is a picture of the reduction hub used on a Roadless (Landrover). It is pretty small, but they hold up fine to 50" wheels and 70HP engines. The one in the picture has worked hard on a farm all its life with no hub problems AFAIK. As you can see they are pretty small hubs (series LR stock drum and hub shown for comparison).




More axle pics...
http://www.pirate4x4.com/forum/showthread.php?t=306487

Ok the common redustion hubs that i use all the time there big heavy and expensive used in evey thing i use em a lot in hydraulic driven machines small hydraulic motor driving reduction hub with wheel mounted to them i,ll get a couple of pics to show you the size there not cheap mount easy but you need to have a huge hole in the center of the wheel to fit the hub and brakes would be a major head ache i use them on hydraulic so i use a hydralic spring brake inside the hydraulic motor but no good for a car .