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kapri
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« on: April 14, 2016, 10:13:32 AM » |
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On a Reliant based hardtail why does no one direct couple the gearbox to the diff? As it is all hard mounted I can see now reason why you need a prop , apart from making it easier to fit .
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Olds
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« Reply #1 on: April 14, 2016, 11:52:22 AM » |
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Has been done, but it's not a great idea. Getting the axle and engine perfectly in line is very difficult and most frames will flex slightly between the engine and axle mounts. There is also possible linear expansion of the engine and gearbox, that may put extra load on the axle and gearbox bearings.
At the very least some form of flexible joint (rotoflex ?) should be fitted.
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Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
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Manky Monkey
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« Reply #2 on: April 14, 2016, 02:55:31 PM » |
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I've often thought about it, using a rubber 'donut' type coupling as you say, (Ford Granada etc), but for my own style of frame, it actually makes it too short for a sensible sized saddle. There used to be an Essex V6 trike about with direct drive.
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On the last freedom moped out of Nowhere City.
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digger06
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« Reply #3 on: April 14, 2016, 07:54:23 PM » |
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mine uses this method, it has just one u/j to help alignment, no prop, no slider, (its the front half of the front uj fixed to the back half of the rear one)been like that 5 or 6 year, no issues whatsoever,(around 20,000 mile on b roads) and my saddles ok, lol
I have made a rubber donut type ready to fit and try,(pics on here somewhere) but the other hasn't created any probs, (I measured linear expansion, and it wasn't worth worrying about , tbh, and my frame doesn't really flex, but the uj sorts that out,)so I still havnt fitted it, laziness really, but why fix what aint broke...
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« Last Edit: April 14, 2016, 07:59:32 PM by digger06 »
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Manky Monkey
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« Reply #4 on: April 14, 2016, 08:11:55 PM » |
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So are you sitting more or less directly over the diff?
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On the last freedom moped out of Nowhere City.
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digger06
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« Reply #5 on: April 15, 2016, 10:11:54 AM » |
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no, just forward of it, middle/front of seats directly above the gear stick,(linkage used) I have a rack on the rear, above the axle which converts to a second seat
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« Last Edit: April 15, 2016, 10:23:33 AM by digger06 »
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digger06
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« Reply #6 on: April 15, 2016, 10:14:33 AM » |
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old pic, different bars, etc etc but you get the idea.
main prob was the old, lower profile wheels, used to bounce the little un about a bit when she was on the back, (not too bad)
smaller wheels/higher profile tyres sorted it, rides just as well round corners but comfier, strange thing on hard mounting the engine unit/axle, I don't seem to get any buzzy vibes from the engine, which I expected, (its the best reliant engine I have come across though, after the rebuild)
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« Last Edit: April 15, 2016, 10:18:11 AM by digger06 »
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the coppersmith
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« Reply #7 on: April 15, 2016, 11:37:26 AM » |
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Nice looking bit of kit, well proportioned etc. Been trying to work this idea out, but as you have proved all being rigid and solid seems to be OK.
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minimutly
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« Reply #8 on: April 15, 2016, 04:06:19 PM » |
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Yes, well proportioned. The reliant gearbox helps being nice and short.
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Manky Monkey
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« Reply #9 on: April 15, 2016, 08:35:48 PM » |
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My Reliant trikes were all solid mounted -never had a problem with them. Nice looking machine.
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On the last freedom moped out of Nowhere City.
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andbolt0
Sr. Member
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« Reply #10 on: April 18, 2016, 06:27:57 AM » |
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you cant connect the diff direct to the gearbox because of different fittings you would need a coupling with a uj i had a trike with minimal length of coupling (basicaly front joint of prop conected to rear joint )
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digger06
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« Reply #11 on: April 18, 2016, 02:51:14 PM » |
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a uj is always best , any alighnment issues are taken up by it,only adds about 3 inch
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