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TOPIC: Gears in the open in many designs

Gears in the open in many designs 4 days 17 hours ago #58280

I've been watching several chassi designs of these crawlers and scale pickups/trucks, and many of them just leave their spur and pinion gears in the open. The gearbox is always encased and sealed but why leave the spur and pinion gears uncovered?

Last year I bought one of Axial's SCX II kits, this chassi is very well sealed, and there are even inner fenders to buy for it to prevent sand and dirt from getting in. All gears are well sealed.



But looking at the RC4WD Trail Finder 2 chassi, one which I'd love to get because of its scale looks and leaf springs, it has its spur and pionion gears completely unprotected so sand and small stones could enter and do damage. Why don't they cover these gears? It's so simple to do!

erh, .. I meant to post this thread in the Technical section, ... oops.

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Last edit: by uncletom.

Gears in the open in many designs 4 days 16 hours ago #58281

I moved it to the "Vintage Tamiya" - "Technical" section for you ... not sure that's mych better ;)

I wouldn't say it's "so simple" to enclose the spur gear, designing & making the injection moulding tooling required is expensive, but I would agree that it is not just sensible to enclose it, it's necessary - but it's surprising how often you see an exposed gear.

IIRC a lot of some IC engined cars have a slot in the chassis the spur gear poked through (even better bit of design there :blink:) to aid starting - but it's a (silly) design choice to have it on electric cars.

:)

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Gears in the open in many designs 4 days 16 hours ago #58283

Thanks for you input, Jonny, and for moving the thread to the correct section.

Yes well I can imagine stones and grit getting into the machinery, and pretty soon I'll be buying new gears. That's not much fun is it. I remember buying the SCXII, with the Jeep Cherokee body, because it was such a complete design, and because of the extra fenders / mud guards.

Just look how it sits fine between the chassi and the body. And with sealed gears. I think there's a leaf spring kit for this one ...

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Last edit: by uncletom.

Gears in the open in many designs 4 days 15 hours ago #58285

The original SCX hat an open gearbox, also quite noisy.
They introduced a cover a little while after.

Tamiya's CR01 has a nice and quiet sealed gearbox same with the new CC02

Got a TA05 with open mod .4 spurgear ,great and silent streetrunner till a particle gets in the gear. The open f&r outdrive gears are less of a problem.
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Last edit: by waterbok.

Gears in the open in many designs 4 days 14 hours ago #58287

For what it's worth, I've got a couple of RC4WD Trail Finder 2 trucks and haven't had any trouble with contaminants getting in the gears. I suppose one advantage of being open is that things can also get out, especially water and mud which are more likely to be ingested than rocks. These may well filter through even a "closed" spur gear and then be unable to get out.

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Gears in the open in many designs 4 days 4 hours ago #58289

Good point there Blakbird. I was considering that as well. But driving through mud and water, letting smaller particles into the gear case, isn't as bad as getting a larger pebble between gears either jamming the transmission, or at worst deforming a gear. Besides, after the run I'd still remove the gear cover to check for any water or mud inside.

To me, omitting such an obvious protection in such an expensive kit, is arrogant. Assuming that I will be doing nothing but crawling and trailing with the Trail Finder 2 is just plain dumb - It's a Toyota, let it live up to its standards. One other great disappointment is that there's no aftermarket cover either.

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