Thread: Portals

Originally Posted by Bush65

When I made that statement I was unaware they changed the design. What I based it on were the prototype portals that oilworker posted pics of.

If you have a look at this photo the case is now equally divided into two halves, I am not sure what difference this makes but it is not the same as the original portal of Oilworkers.

Current Version



Prototype

Further to my comments about resilience and shock/impact loads, I meant to add that the half shaft, between the diff and portal box will absorb some of the impact energy.

However because of the load path from the drive flange, through the stub shaft and the portal gears to the half shaft, and the rotational inertia of those components, the resilience of the half shaft can't protect the stub shaft from high transient stress peaks.

It may be in equal haves but it's alloy as compared to steel on oil workers portals which has to be stronger .

Hard to tell in the photos, but I suspect the stub shaft is being over-supported and seeing bending stress. This is meant to be a full float, unit bearing hub, like every other modern car in the world. The stub shaft needs to be supported fully from the hub. With the integral gear, there looks to be a third bearing on the back in order to maintain proper gear mesh. Unfortunately, with spindle flex, this puts bending load into the stub.

If you have the coin. the West Australian company Proformance have significantly elevated the bar with their portals and diffs for independent 4x4 suspension.

Until now independent suspension for a 4x4 limited ground clearance and down travel. Proformance addressed the ground clearance by using portals at the wheels. Moving the brakes in board and the cv's inside the diff allows the maximum possible driveshaft length for increased travel.

Rear wheel travel 33" no portals in this pic of their offroad racer, the portals are for Ultra4 racing where more ground clearance is required.


Portal. Inboard brakes allow the cv to be further out and fixes the problem of large offset from the swivel/king pins and scrub radius.



Diff.

Since Maxidrive is no longer, where can you buy portals?

Originally Posted by blitz

Since Maxidrive is no longer, where can you buy portals?

TIBUS Offroad Engineering

Landrover Tuning :: Bolt on portale with a ratio of 1.6 to 1, for Defender 4"lift

Welcome - AxleTech International Motorsports

OR you could go...

Portal Axles - AxleTech International

Originally Posted by Bush65

If you have the coin. the West Australian company Proformance have significantly elevated the bar with their portals and diffs for independent 4x4 suspension.

Until now independent suspension for a 4x4 limited ground clearance and down travel. Proformance addressed the ground clearance by using portals at the wheels. Moving the brakes in board and the cv's inside the diff allows the maximum possible driveshaft length for increased travel.

Rear wheel travel 33" no portals in this pic of their offroad racer, the portals are for Ultra4 racing where more ground clearance is required.


Portal. Inboard brakes allow the cv to be further out and fixes the problem of large offset from the swivel/king pins and scrub radius.



Diff.

Correct me if I'm wrong John. But isnt' that the way they've been making Hummers for years and years..... like since the mid-80's or something....