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Mud n' Water - Research for Major Project

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JIMBOBLY:

--- Quote from: Boddle on March 06, 2009, 08:40:30 --- One thing missed here seems to be axle and gearbox breather which are either connected into the snorkel or taken to the top of the vehicle, Having spent a lot of time in water my rear diff pinion bearing has pack up due to water getting into the rear diff via a breather pipe which strangely seemed to be fitted in the rear wheel arch right in direct line of the the rear wheel spray. I now work in JLR driveline design so they shouldn't get it wrong in the future.

 If you are in Coventry area you could bring your question along to the monthly meet held look under pub meets for the next (last Monday of the Month) I am sure there are a number of us who will bore you to tears with does and don'ts.

 Something to think about when designing for water is don't try and seal thing from it unless you have oil in it, water has an amazing ability to get place, a diving bell approach is probably the best Technique here, and avoid electronics where possible.

--- End quote ---
i did actually mention it mate if you look further up,cause ive had the same problem as you,didnt knacker the diff completely though

trautmann:
Ah, you'll have to be forgiving, as you can probably appreciate, this being a design module, ideas will get dropped and picked up rapidly.

Suvvey, to answer your question, this will be a design that could possibly be made into a concept vehicle that will be an example of what could be done.  It'd be built in Colombia if there ever is a concept built (which would be awesome).

Anywho, back on track.  And on the topic of tracks, the group have decided to drop them because of the aforementioned track throwing issue raised by tack43, and the sourcing issue presented by Suvvey.  We've decided that we'd like to pursue the following ideas, due to their simple and innovative aspects:

http://www-robot.mes.titech.ac.jp/robot/wheeled/helios3/helios3_e.html

http://2bbie.wordpress.com/2008/11/19/tweel/

http://www.youtube.com/watch?v=pcdmH_hVWBY

The 'Tweel' is something we'd like to pursue as a possibility on our vehicle because of it's alleged durability and shock absorbing functions.  Obviously, it would have to be modified to deal with other scenarios, such as the ones on the Cat machines in the youtube video.  It would be pretty cool to further combine the idea of the 'stair climbing wheelchair' in the first link with the tweel to create a really weird, but potentially extremely effective wheels and tyres.  It'd be cool to hear anyone's thoughts on the Tweel - yay or nay?

We're liking the idea of the body providing buoyancy for the vehicle, to enable it to float.  The idea of using a BV206 style body is looking more attractive.  Does anyone have any information about the drive system for the front module of the BV?

Also, cheers for the pics clbarclay, the group are most appreciative  :thumbup:

Ah, does anyone know much about this beastie?:

http://www.army.mod.uk/equipment/fighting-vehicles/1488.aspx

Hope you all have a good weekend, as always, developments as they happen  :D

PS - As I was typing this carbore posted the thought about dual wheels - liking that idea btw.

Suvvey:
The tweel seems like a clever idea but it may not be that good in muddy conditions. The mud would obviously get in through the open sides which may not be a problem when crawling through the mud but when you then get back on to the open road it would cause some very nasty balance issues. Also not to sure how long they would last in either urban or natural debris strewn areas. Would soon pick up bits in the sidewalls (or lack of them) and tear them to pieces. Maybe a more conventional tyre with good heavy duty sidewalls would be wiser.

As for the Jackal it is a new replacement for the land rover wolf based WMIK weapons system. Lots of grunt and much better  armoured underbelly to withstand mine strikes. Not sure if their are many new developments on it that would be of particular advantage for your needs. Unless you are planing on saving lives in extremely hostile areas :shock:

clbarclay:
This dosn't show the engine/grear box, which sit directly above the chassis beam of the front half. The gearbox is linked to the transpherbox by a short prop shaft. The drive to the fron runs inside the chassis beam to the diff at the very front. Another propshaft links the transpher box to the rear diff (labled as the final drives in diagram).




Those tweels are interesting, but as shown they are not indestructable. If you do go for something like that then consider using tweels that are a similar size to common tyres and hubs with a common PCD so that if needs be spares could be borrowed from local vehicles rather than having to have another tweel. I may be wrong, but I though the tweels only had open side walls for demonstration purposes and production wheels could/would have side walls

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