Axle-Less AxleLess Suspension - TIMBREN - Page 2 - Fiberglass RV


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Old 05-03-2013, 08:19 PM   #15
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Originally Posted by honda03842 View Post
Etrailer has an article on axle less suspension, comparing it to traditional suspensions.


Timbren Axle-Less Trailer Suspension System - Straight Spindle Only - 3,500 lbs Timbren Trailer Suspension ASR3500S05
Very thorough! .... and positive when comparing against traditional* torsion axle

* replaces the former 'old & rudimentary'
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Old 05-03-2013, 08:21 PM   #16
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Originally Posted by Francesca Knowles View Post
Thanks for the heads up, Franck!

Francesca
You're welcome
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Old 05-03-2013, 08:29 PM   #17
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Very thorough! .... and positive when comparing against traditional* torsion axle

* replaces the former 'old & rudimentary'
Sadly, there are some inaccuracies in this "article". For example not all torsion suspensions require a cross beam (ie. torsion half-axles do not require a cross beam), and not all torsion axles "twist" the rubber.
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Old 05-03-2013, 10:34 PM   #18
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The replaceable rubber spring looks to be an advantage over the enclosed torsion spring design as far as serviceability goes. As mentioned in above posts there is the issue of the trailer frame having to deal with the cantilevered load unless you add the tube cross member to handle those loads. That would in effect be adding an axle back into the axle less axle
Also as mentioned above you would have to deal with tricky alignment issues to get the trailer to track properly, since you have to deal with camber, and getting the wheel pointing perpendicular to the trailer axis.
Flexiride sells individual left and right stub axles for cases when a boat keel or V bottom would intersect a straight across axle, but I don't see an advantage when not required by interference issues.
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Old 05-04-2013, 12:31 AM   #19
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Really.... And they can't blame the winter climate in California !!!!
Is that City streets only or country road are to blame as well 'cause the problem here is pretty much across the whole province!
Franck having spent time driving in many parts of your wonderful province as well as having put in a few miles in California and Arizona I would suggest they have you bet in regards to rough roads. I don't recall while driving in Quebec thinking the roads were any more rougher than those in BC. Can't say the same for California and Arizona though. They do indeed have some surprisingly rough riding freeways, as well as minor highways to the south of us.
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Old 05-04-2013, 01:04 AM   #20
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Sadly, there are some inaccuracies in this "article". For example not all torsion suspensions require a cross beam (ie. torsion half-axles do not require a cross beam), and not all torsion axles "twist" the rubber.
Technically, then I would think it wouldn't be a torsion axle.
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Old 05-04-2013, 02:02 AM   #21
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Technically, then I would think it wouldn't be a torsion axle.
That's very true! I believe that many of what we call torsion axles are not true torsion axles -they compress rubber cords rather than twisting them.
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Old 05-04-2013, 02:16 AM   #22
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Yeah, It doesn't really matter, just something I didn't think of before. I've called mine torsion, and it has rods as you described.
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Old 05-04-2013, 06:53 AM   #23
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Looking at the Timbren data the total suspension movemnent at the wheel looks to be about the same 2-3" (unloaded to full bump) as almost any torsion trailer axle. That compares to the 6" or more on most tow vehicles (and maybe on franck2cv's German trailer).

Without suspension travel, the springing has to be stiff so the ride is not going to be soft. Changing the type of spring (steel, rubber, air) doesn't affect that much, however fashionable one or other type is.

I agree with the previous posters who point out that "axle-less" suspension just mean the axle's strength has to be built into the trailer frame.

I think lining up two separate half-axles is a concern in North America as so few people do it. In Europe, half-axles are common on small trailers (though not on travel trailers, if I'm getting my US terminology correct) and lining them up is not rocket science - tape, string and chalk is what's used, not lasers and telescopes.
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Old 05-04-2013, 10:08 AM   #24
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Franck having spent time driving in many parts of your wonderful province as well as having put in a few miles in California and Arizona I would suggest they have you bet in regards to rough roads. I don't recall while driving in Quebec thinking the roads were any more rougher than those in BC. Can't say the same for California and Arizona though. They do indeed have some surprisingly rough riding freeways, as well as minor highways to the south of us.
Thanks.... I'll have something to say to the forever grumblers.... Whom I've been part of lately!! I still have Vermont and NY state to enjoy smooth roads!
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Old 05-04-2013, 10:15 AM   #25
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I took it for granted that the Suspension travel was greater than 'traditional' rubber rods (not) torsion, (not) twisting, flexride like axles.....
It's not and is a bit of a disappointment. The higher rating one (3000lbs) has a longer travel but makes no sense on our desired travel trailer.

In an ideal world, we would need a documented test ride with two identical trailers equipped with those different suspension designs....
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Old 05-04-2013, 12:09 PM   #26
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Is it the opinion of the group that a crossmember added to the frame at the point where the "axle" would be should be sufficient frame reinforcement?

I don't see this as a big deal- my main interest is removing as many underslung impediments as practicable, and an against-the-body crossmember would be fine with me...

Francesca
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Old 05-04-2013, 12:55 PM   #27
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Originally Posted by Francesca Knowles View Post
Is it the opinion of the group that a crossmember added to the frame at the point where the "axle" would be should be sufficient frame reinforcement?

I don't see this as a big deal- my main interest is removing as many underslung impediments as practicable, and an against-the-body crossmember would be fine with me...

Francesca
Francesca
It seems that a square tube inserted into the pocket of the suspension member would help counter the cantilevered loads that would have had to be resisted by the frame mounts alone. Since our trailers weren't designed to handle those loads It would be good insurance to add the cross member.
That cross member may be tucked up to the frame a little higher than the typical torsion axle tube, but your not buying much more clearance. If you do a lot of off-road travel you could "joggle" the cross member up between the frame rails and back down to buy a couple of inches if there is no other stuff in the way.
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Old 05-04-2013, 03:14 PM   #28
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I think retro-fitting this suspension to an existing egg is going to be hard unless the cross-member is added between the two half-axles as shown in Timbren's instructions - in which case it becomes a whole axle that you have built yourself.

If the cross-member is to go up in the frame, there's going to be quite a lot of welding right by the floor, so having more than one fire extinguisher nearby would be good.... And unless the ends of the newly-added cross-member is almost touching the half-axles, the strength of the connection between those two needs to be considered.

So for example, I would be nervous doing this on an 'open section' frame rail like a C-channel which doesn't have much torsional strength. If the main rails of the frame are rectangular tube, which most modern eggs are, I believe, then they can probably survive, maybe with a little local reinforcement.

Anyone doing a body-off restoration would be in a different position as there would be full access to fit the cross-member in the best place.
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