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Unread 12-09-2007, 13:00
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Re: pic: DeWalt drive base

Quote:
Originally Posted by AdamHeard View Post
118 Ran four small CIMs and two FPs into one dewalt this season.
I got to talk to some of the guys from 118 at LSR last season. They told me they'd had some problems with the gears in the DeWalt shattering, but I don't know exactly why this occured, or how frequent it was. Also, I remember them having several backup V6's. Nonetheless, they definitely proved that it can be done. Hopefully one of the guys that worked on the '07 118 drive train could fill us in on what they found out about the DeWalts.

Quote:
Originally Posted by Qbranch View Post
I'm not a big time drivetrain guy... but can a DeWalt transmission take the torque of two CIM motors? Perhaps you could combine their torque before going in to the transmission?

Or, to avoid the 'losing half the transmission and stripping them out' problem if one shifts and the other doesnt (or other reasons why one might sease) can't you just turn the torque clutch down on the drill to a reasonable number so that in case you start to backdrive the transmission too hard it just slips? I don't know how much torque the clutches go up to in those things before they go direct drive, just a thought.

-q
The DeWalts have been shown to handle the torque of two CIMs, but since only a few teams have done it, we don't have much information on how well they hold up. So many teams have followed the whitepaper and have never touched their DeWalts after that, and that reliability is part of what makes the DeWalts so valuable. Also, in dbell's design he's keeping the first stage of planetary gears, so there's already 3 times more torque on the transmission than what most people have used.
As for the torque clutch, it's typically removed with the CIM configuration, since we remove the first stage of planetary gears. Since this design is keeping those, I'm not sure if he's going to keep the clutch or not. Either way, in a high torque application (like the drive train), you probably wouldn't want to mechanically limit your power unless you really knew what you were doing.

dbell - are you planning on keeping the clutches? If so, you should read this: http://www.chiefdelphi.com/media/papers/1680. They kept the clutch in and found that it bent after a couple of matches, causing them to service the transmission frequently. If you aren't going to keep them, how are you going to keep the first ring gear in place?
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Last edited by newton418 : 12-09-2007 at 13:05.
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