|
|
Post by jose on Nov 20, 2003 0:25:59 GMT 1
it is the new system of suspension in rear axle ? . I can't see clearly the photos . anybody that visited agritechnica can explain the system .   |
|
|
|
Post by Gerard on Nov 20, 2003 2:57:29 GMT 1
hard to see, but looks like a 4 link independent suspension...
Some pictures from the back might help.
|
|
|
|
Post by Hendrik17 on Nov 20, 2003 6:25:55 GMT 1
|
|
|
|
Post by Gerard on Nov 20, 2003 6:38:20 GMT 1
that does help.
I think I see 4 links going back to the tractor...
That big round thing is probably the external planetary and the brakes are probably in there too.
looks like it is in its lowest position.
|
|
|
|
Post by arno on Nov 20, 2003 12:29:30 GMT 1
JD introduced in Spain this suspension. Don't know if it's available yet, but they want to show what's possible (but expensive. . . .). Offcourse the Renault-cabin suspension is much easier (and cheaper) but not allowed to immitate!
it looks solid to me, but for the mid-range tractors way too complex.
nice engineering btw!
also the 7020 looks realy fine, I have to say.
|
|
|
|
Post by Voederbietel on Nov 20, 2003 17:19:25 GMT 1
I think the big round things only contain some very heavy duty bearings, because the short axle causes a very high moment because of the little space between those bearings (transversal). and I think the planetary reduction and the brakes are placed directly to the differential, because of the torsion they generate. this way JD can build the suspension arms less heavy.
muj
|
|
|
|
Post by jose on Nov 20, 2003 18:16:49 GMT 1
I also think , the big round not is the planetary , is Straits for the planetary
|
|
|
|
Post by eppie on Nov 20, 2003 22:04:30 GMT 1
Voederbietel,
You are correct about the position of the brakes effecting the suspension arm torque...
But the same thing applies for the end reduction hub...
Torque only occurs on gear wheels, brake disks and tires. NOT in the bearings.
With the planetary gear, the suspension has to hold the ring gear of the planetary gear in place, or else it would be working as a differential.
But if the final reduction was BEFORE the suspension arms and universal joints, no direct reaction torque would be given on the endpiece holding the wheel bearing, because bearings are desigend to make a shaft rotate freely, not to transfer radial torque, it's the purpose of a bearing. (if there are no gears after the spring pivots)
About the shaft bearings being close together: Truck axles are made the same way, with about the same load rate. I'm just curious what type of universal joint they use in the driveshafts, and how much the travel is from deepest to highest position...
|
|
|
|
Post by Gerard on Nov 21, 2003 0:08:37 GMT 1
lol, time to brush up on physics for me...
Anyway, looks very expensive...
How are farmers going to justify the cost?
|
|
|
|
Post by Woodbeef on Nov 21, 2003 13:12:38 GMT 1
Hmmmm.....wish there were better pics,and some of it partially assembled.
I think it is in it's normal or level position in the pic,not the lowest part of travel.
From the look of things I'd tend to say it is an outboard planetary set up. I do not think there is enough room in the pig for the planetaries to be in board and still allow full articulation of the axle.
|
|
|
|
Post by leemsutton on Nov 21, 2003 18:05:36 GMT 1
Apparently an extra £15,000-£20,000 will buy you the option. Its far to costly as you can buy a Fendt, Renault, JCB with a suspension system at half the cost.
|
|
|
|
Post by David W on Nov 21, 2003 18:09:03 GMT 1
I think you can do JD parts on line now, is this to new to be shown yet? if not you could perhaps see a parts page of the suspension.
|
|
|
|
Post by jose on Nov 21, 2003 18:24:40 GMT 1
hey leemsutton
but the fendt and renault not have suspension in rear axle .
the fastrac have suspension y rear axle ?? .
hey David
not have the suspension rear axle in jd parts yet
|
|
|
|
Post by eppie on Nov 21, 2003 20:10:49 GMT 1
It could have been dirt cheap if they redesigned the differential housing into a truck like axle that could move up and down in an end frame. But that gives trouble with the position of PTO shaft and 3p lift kit.
Most expensive thing is to include new systems into an existing integrated design. If it was of a more modular build, it would be easier.
|
|
|
|
Post by Woodbeef on Nov 22, 2003 13:06:09 GMT 1
I'm having trouble understanding how anything that is hitched to the rear will react to the changing heights of the tractor. Will it not be hard on pto drives and other equipment???
|
|
