"Cé hé sin" (michael-m-mouse)
03/04/2015 at 13:18 • Filed to: Panhard
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"Cé hé sin" (michael-m-mouse)
03/04/2015 at 13:18 • Filed to: Panhard | 3
| 9 |
Panhard stopped making passenger cars more than fifty years ago but they continue in the arms trade and have made a wide variety of armoured cars.
One of the more popular was the EBR, the " engin blindé de reconaissance" or armoured reconnaissance vehicle which went through several different models, all of them 8*8s with liftable middle wheels. It's a pleasingly weird thing as we see here. The diagram is in French, because Panhard, but to explain it the front is to the left. We see two steering positions (cue weary dead-horse flogging comments about French retreats) and a centrally mounted engine. Yes, mid engined like the best Ferraris. To the left of the engine (a flat 12, because Panhard really liked flat engines) we find the transverse gearbox which sends power along driveshafts on each side of the vehicle, having split said power to shafts going forward to the front axle and rearwards to the remaining three. Note that each of the eight wheels gets its own crown wheel and pinion.
potentialthreat
> Cé hé sin
03/04/2015 at 13:30 |
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You forgot a picture
RamblinRover Luxury-Yacht
> Cé hé sin
03/04/2015 at 13:31 |
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The parallel drive sort of system seen here is similar to that used by DAF on one of their 6x6s, and to the twin engine parallel drive on several Soviet heavies.
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Cé hé sin
> RamblinRover Luxury-Yacht
03/04/2015 at 14:03 |
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Yes, they used it as well. Interestingly I can't see any signs of differentials anywhere unless the "répartiteur" - distributor - could be one.
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Cé hé sin
> potentialthreat
03/04/2015 at 14:12 |
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Yes, spot the difference in the wheels...
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RamblinRover Luxury-Yacht
> Cé hé sin
03/04/2015 at 14:15 |
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At best it'd be whole-side to whole-side differential action like the DAF or engine speed in the Russkies. I don't know why you'd need two units if it was a concentric differential, though unless (as is possible, and it even looks like), it's distributor offering variable speed between the two wheels on one end and the other *six* and not side to side differential balance at all. I don't think it's precisely that either, though. It looks more like a limited slip coupling or fluid coupling, with absolutely direct drive only to the wheels on that end. Perhaps that's why six of the wheels are green-coded? In any case, it demands as a setup a differential of sorts with a 3:1 torque split, and can only cope with side to side speed differences by forcing slip of some wheels extra (or using indirect drive) and distributing the gains or losses to larger sets all ganged together - thus forced to slip some there as well. Absolutely barmy.
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Cé hé sin
> RamblinRover Luxury-Yacht
03/04/2015 at 14:41 |
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Well, I suppose the "répartiteur" is splitting the torque between the front and the remaining axles (there seems to be one each side, which makes sense). The gear trains in each hub presumably allow vertical movement and I see there's an "inverseur" before the main gearbox which allows the input shaft in the gearbox to be turned either way, so 4F/4R.
I think the middle wheels are green to show that they lift and have solid tyres.
Now that I look at it here's nowhere they could put a differential unless it's that thing between second and third gears, just to the right of the word "route". Drive is taken from each end of the gearbox output shaft so the only place they could have a differential is here.
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RamblinRover Luxury-Yacht
> Cé hé sin
03/04/2015 at 14:58 |
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I think that's it. If you look at the gearbox output shaft toward the top of the drawing, it looks smaller than the section on which the gears ride, which presumably means it's routed concentrically within the gearbox shaft to a set of spider gears in that unit. However, the shaft toward the bottom of the drawing isn't shown the same way. Therefore, it seems possible or even likely that one half of the output shaft is routed differentially and the other is not - 3rd and 4th being routed to the outer of the differential, 1st and 2nd and their shaft routed to one of the spiders, and a lock of the diff in 1st and 2nd driving both together. Appearing, then, to be a compromise - locking diff action automatically called on in 1st and 2nd for need, and 3rd/4th being used for road driving, differential to reduce wear. It's a traceable logic, just very perverse.
The two furthest wheels to the right do appear to be green-tinted as compared to the leftmost, which is why I made the observation the way I did. Also, is it possible in this setup to de clutch the four middle wheels? It looks like it. Thus leaving a vehicle with four wheel drive out of four, and four wheel steering. Still quite mad.
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Cé hé sin
> RamblinRover Luxury-Yacht
03/04/2015 at 17:51 |
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The middle two axles lift so they must (well, should!) be clutched somewhere.
I see further weirdness too. The rearmost drive shafts have UJs, the others do without. There's no obvious reason why they did this. There's also a boite variée between the clutch and the reversing mechanism which performs some function not immediately obvious.
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Cé hé sin
> RamblinRover Luxury-Yacht
03/04/2015 at 18:47 |
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Actually, the middle wheels aren't clutched as per this video.