ring & pinion gears (car axles)

I may come to need a pair of helical gears to change a shaft direction 90 degrees, with a reduction of about 4:1 to 5:1 .
Though they are a bit large, the cheapest sources of these is the gears from car axles. The stress they will be placed under in my use will be drastically less than what they'd get moving a car around.
What does the measurement of car R&P sets refer to exactly? I can't find any place that says.
Second I have noticed that many axles are not bevel gears but hypoids. I would need to know the shaft offset to make a proper housing, since axle pumpkins are way heavier than I'd want. Is there anywhere online that gives that info?
If there is any other source of perpendicular ring & pinions around 5"-6" diameter I'd like to hear about it. ....ATV's are around the perfect size, but at $200+ a pair, they cost as much as the much-stronger 7"+ car gears. ....Golf carts all seem to use parallel drive methods (roller pinions instead of bevel gear pinions). ....custom gear places would want $500 to make a pair of hardened gears that size. ....I have looked at a lot of surplus miter gear boxes, but they're usually straight-cut gears, or have a reduction ratio that is too high.
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DougC wrote:

The measurement is the ring gear OD. if you don't need much load capability, go with the smallest dia you can find in the ratio you need. 4.56 and 4.88 are pretty common ratios, though usually on fairly large gears for larger trucks.
Have you looked for a right angle gearbox on surpluscenter.com ? You can likely find something better than auto diff gears there.
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wrote:

How about an old shaft drive motorcycle rear end? Then you wouldn't have to build a housing.
Karl
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wrote:

I've seen 4.56:1 sets, but they're usually about ten inches in diameter.

4.56:1 means that the pinion shaft turns four and one half times for every revolution of the ring gear. Size is usually O.D., IIRC, but it's been a long while.

Good question.

ATVs were the source I was going to suggest. Try Burden Surplus at www.surpluscenter.com . I've seen them there, complete with trannies. $15-350. Complete ZTR left/right Transaxle Assemblies are about $699.

Burden might also have right angle gear reduction units for cheaper prices (made for DC motor use.)
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On Sat, 16 Apr 2011 20:07:55 -0700, Larry Jaques

1928 to 1948 Ford car rear axles are coplanar with helical gears. HTH, Bob
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DougC wrote:

What Karl said. Here's one from a GoldWing, has one measly $25 bid, with less than a day remaining. <http://cgi.ebay.com/ebaymotors/FINAL-DRIVE-GEAR-Honda-Goldwing-GL1200-1984-/110670295801?pt=Motorcycles_Parts_Accessories&hash=item19c476b2f9
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Are you looking for one unit or a steady source?
Speed, torque, horsepower?
jsw
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On 4/17/2011 7:43 AM, Jim Wilkins wrote:

This is for a ~5 hp engine for a bicycle, and I only need one.
My concern with the surplus and motorcycle drives is if the gears would eat themselves, would there be a source of new parts at realistic prices?
The car R&Ps are huge, fairly cheap and new sets are easily available if (somehow) the first one would end up failing. I wouldn't need an entire CAD file of the whole rear-end, just the axis offsets--and the gear manufacturer would know that.
The ATV unit is about ideal, but I think the only ATV ring & pinion gears I have found at all are for the Honda TRX 300,,,, a model that the factory stopped building eleven years ago.
I'm looking at re-arranging the engine to avoid the 90-degree gears at all though.
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If you can engineer one unit to fit, why couldn't you redesign for a different one?
jsw
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DougC wrote in rec.crafts.metalworking on Sat, 16 Apr 2011 14:12:54 -0500:

you might check with the Jeep/4x4/off road folks(forums/newsgroups), as they often swap out the ring and pinion sets when beefing up their rigs. And you might be able to contact someone at the auto/truck gear set mfg. that can tell you what the offset for a particular set of gears/ axle.
--

Dan H.
northshore MA.
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On Apr 17, 8:36pm, snipped-for-privacy@privacy.net (dan) wrote:

http://en.wikipedia.org/wiki/Spiral_bevel_gear#Comparison_of_spiral_bevel_gears_to_hypoid_gears
jsw
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