Trailer design - where are the clever guys





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  1. #1
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    Default Trailer design - where are the clever guys

    Busy designing a flatbed trailer which can fit a cattle frame on top.
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    But is it too high. With 215R15's it will be 650mm from the ground to the load bin.

    Any reason why I cannot fit the axles on top of the springs?

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    It will drop it by 100mm and I'll still have 75mm clearance between bottom of chassis and top of axle
    Last edited by Uys; 2018/06/28 at 07:08 PM.
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    Default Re: Trailer design - where are the clever guys

    Springs
    Under: With the springs swooping under the axle they generally need more arch to achieve lift and can actually stiffen the ride and hinder the flex. Yet one of the great positives about this setup is that your center of gravity remains lower and often offers a more stable feel on off-camber obstacles.




    Over: Since you are gaining lift by moving the perches on top of the axletube, a flatter or softer spring pack can be used to gain articulation and create a more cushioned ride. This also opens you up to more spring options, and for the budget-minded, this means taking a trip down to your local junkyard and trying out different spring combos.

    I have seen another design at a banana farm the axles is on the chassis, the load bed float on coil springs in tubes a nice soft floating ride. Very low down trailer.

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    Default Re: Trailer design - where are the clever guys

    Well it works for a Land Cruiser.
    2004 Defender 110 Td5


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    Default Re: Trailer design - where are the clever guys

    Over or under spring pack purely design principle.

    You can also look at rubaxe axles and eliminate spring packs.

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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by MickPrado View Post
    Over or under spring pack purely design principle.

    You can also look at rubaxe axles and eliminate spring packs.
    http://www.4x4community.co.za/forum/...32#post3927932

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    Default Re: Trailer design - where are the clever guys

    As a matter of interest, why a double axle?
    You could get a heavier duty single axle to carry the weight. Permissible by law to carry 8t on one axle.
    Cheers
    Brett

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    Default Re: Trailer design - where are the clever guys

    Back in the day when all vehicles were leaf sprung over slung was typical. You would need to swop over the spring centre bolt if itís set up for underslung. The head should sit in the recess in the axle saddle.

    Also check your bump stop distance if itís all setup for underslung

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    Default Re: Trailer design - where are the clever guys

    Also check on Pinterest - there are some interesting trailer and trailer axle designs

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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by 1Goat View Post
    As a matter of interest, why a double axle?
    You could get a heavier duty single axle to carry the weight. Permissible by law to carry 8t on one axle.
    I would say the double Axle is for tyre load, yes you can get an 8 ton axle, but what tyres are rated 4 ton (each)?

    I would also suggest looking at the rural axle
    Geoff Craig
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    Default Re: Trailer design - where are the clever guys

    Thanks guys.

    It is so much easier to load animals if the trailer is lower, you don't even need a ramp, they just climb on themselves.

    Rubax is rubish on badly corrugated roads (IMHO) as they fail in the rubbers and I've seen many break the stub axle. They are also stupidly expensive!

    Double axle is a must. It provides tow stability and redundancy.

    I am fitting 1800kg/pair leaf packs with 2 x 2000 kg axles. Trailer will be registered for 3200 kg GVM. Currently, without the cattle frame it is 650 kg, but I still want to stiffen up the chassis, specially where the A-Frame exists the load bin in front. I'll run a FEA on it next week.
    Everything is a hammer.
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    Default Re: Trailer design - where are the clever guys

    Uys is the green cattle frame the final design or just added to get an idea of what the flat bed trailer should look like?

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    Default Re: Trailer design - where are the clever guys

    Think about fitting 1 blade and then some air springs. They will handle the rough roads much better. All trailers, for trucks, that go North into Africa, have air springs. Else the trailer just gets broken into pieces.
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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by HannoK View Post
    Uys is the green cattle frame the final design or just added to get an idea of what the flat bed trailer should look like?
    Well, it is not final, is a work in progress. Both front doors will have hinges front and back and bottom. That way I can open the door in either direction or drop it down as a ramp. My experience with rentals with sliding doors is that they are generally difficult to operate as the animals push against it.

    The rear will most probably be the same, but with two doors locking in the middle.

    Pipes will be used as separators in the middle.

    I am assuming you have an opinion/experience with this, which I would love to hear!
    Last edited by Uys; 2018/06/29 at 07:34 AM.
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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by Henris View Post
    Think about fitting 1 blade and then some air springs. They will handle the rough roads much better. All trailers, for trucks, that go North into Africa, have air springs. Else the trailer just gets broken into pieces.

    Too much complexity and stuff that can go wrong.
    Everything is a hammer.
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    Then it it a chisel.

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    Default Re: Trailer design - where are the clever guys

    1. You need cross-bracing in the rail structure - currently you only have rectangles, no triangles.
    2. Do it right and design a "true" bogey with one axle.
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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by 4eTouareg View Post
    1. You need cross-bracing in the rail structure - currently you only have rectangles, no triangles.
    2. Do it right and design a "true" bogey with one axle.

    Are you referring to a single axle with a swing arm and a wheel on each end of the swing arm?
    Everything is a hammer.
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    Then it it a chisel.

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    Default Re: Trailer design - where are the clever guys

    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

  18. The Following User Says Thank You to Uys For This Useful Post:


  19. #18
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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by Uys View Post
    Are you referring to a single axle with a swing arm and a wheel on each end of the swing arm?
    Yes, the advantages are plenty.
    Last edited by 4eTouareg; 2018/06/29 at 07:42 AM.
    "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity" - Martin Luther king Jr

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  20. #19
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    Default Re: Trailer design - where are the clever guys

    Quote Originally Posted by Uys View Post
    Well, it is not final, is a work in progress. Both front doors will have hinges front and back and bottom. That way I can open the door in either direction or drop it down as a ramp. My experience with rentals with sliding doors is that they are generally difficult to operate as the animals push against it.

    The rear will most probably be the same, but with two doors locking in the middle.

    Pipes will be used as separators in the middle.

    I am assuming you have an opinion/experience with this, which I would love to hear!
    I will definitely not call myself an expert but have been around transporting mostly game animals for a few years, but a bit of cattle experience as well as a laaitie.
    But I like to look at different people's designs to look for things that work well or might be issues.

    The first thing in your design that I noticed is the need for some plates on the sides and back at the bottom of the cattle frame. Open like that animal legs always slip through and then often get stuck in some way. Or they kick and their legs go through the gap and then get stuck.
    You can leave a VERY narrow gap at the bottom to assist with washing the trailer down. Or a bigger gap with a narrow piece of expanded metal to close it up.

    Second thing from your reply is that swing gates are not a good idea. If you have to load against another loading ramp you cannot swing the gate close without having to move the trailer forward first. This won't work with animals already loaded. Or you have to open the gate first before you reverse against a loading ramp to offload.
    I hear what you say about sliding gates and animals pushing against them, but a prodder normally get them to move forward away from the sliding gate very quickly.
    However, if still a concern for you, and something used in rhino trailers with a drop down back which can serve as loading ramp is to have a few post sliding through the side of the frame through holes to the other side that prevents animals from pushing against the drop down door or sliding door. Also gives a bit of extra security that your doors are not going to open in some way if animals push against it.
    Last edited by HannoK; 2018/06/29 at 08:07 AM.

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  22. #20
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    Default Re: Trailer design - where are the clever guys

    Good feedback, thank you!


    The flat bed will have bushes welded in through the rectangular tube to accept the cattle frame or drop sides. These bushes will be 10mm proud to facilitate proper welding. So the 10mm gap will be sufficient to wash.

    Plates will definitely be welded in at the bottom - 600mm high with a cross break for stiffness.

    I still want to add a "walkway" behind the mud flap with expanded metal on to prevent slipping.

    The purpose of this trailer is twofold:

    1. Transport feed to the farm - we typically need to transport 3 tons on a Saturday so currently we have to rush 3 trips before closing time
    2. Transport animals (mostly weaners) to auction


    Then transport of small quantities of cows or a bull or two also plays a role.

    I've looked at buying one but:
    1. Multi-role trailers are not readily available
    2. Cost is very high - 4m cattle trailers is between
    3. Quality!!! Oh the quality!!!!


    Here are some pictures of the better trailers I saw at Nampo - considering this is their display unit!

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    For his you pay R74 000 excl!
    Last edited by Uys; 2018/06/29 at 08:53 AM.
    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

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