ring & pinion gears (car axles)

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.

Have you looked for a right angle gearbox on surpluscenter.com ? You can likely find something better than auto diff gears there.

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

Karl

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

Good question.

ATVs were the source I was going to suggest. Try Burden Surplus at

Burden might also have right angle gear reduction units for cheaper prices (made for DC motor use.)

-- Threee days before Tucson, Howard Dean explained that the tea party movement is "the last gasp of the generation that has trouble with diversity." Rising to the challenge of lowering his reputation and the tone of public discourse, Dean smeared tea partiers as racists: They oppose Obama's agenda, Obama is African-American, ergo...

Let us hope that Dean is the last gasp of the generation of liberals whose default position in any argument is to indict opponents as racists. This McCarthyism of the left

-- devoid of intellectual content, unsupported by data -- is a mental tic, not an idea but a tactic for avoiding engagement with ideas. It expresses limitless contempt for the American people, who have reciprocated by reducing liberalism to its current characteristics of electoral weakness and bad sociology. --George Will 14 JAN 2011 Article titled "Tragedies often spark plenty of analysis"

What Karl said. Here's one from a GoldWing, has one measly $25 bid, with less than a day remaining.

Are you looking for one unit or a steady source?

Speed, torque, horsepower?

jsw

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.

If you can engineer one unit to fit, why couldn't you redesign for a different one?

jsw

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.