Re: Differential ratios, wheel spin rate puzzle

Posted by Bob on May 24, 2004 at 09:33:26 from (66.163.134.177):

In Reply to: Differential ratios, wheel spin rate puzzle posted by Ray on May 24, 2004 at 08:34:42:

The FACT is that the speed of the single wheel doubles, and the "effective" ring and pinion ratio of 3:1 is HALVED to 1:5 to one.

This is witnessed by the fact you can determine rear axle ratio by the following means:

Jack up one rear wheel, and mark a spot on it. Mark the input yoke, and count the turns the input yoke makes to turn the wheel one turn. On your hypothetical 3:1 ratio axle, 1.5 turns of the input yoke will turn the one wheel that is jacked up 1 turn. (Assuming an "open" differential.)

The motion of the spider gears "walking" around the differential side gear that is stationary is ADDED to the rotation of the differential housing, doubling the speed of the wheel that IS turning. This "doubling" effect would hold true with ANY combination of spider gear and side gear tooth counts.

Follow Ups:

• Re: Re: Differential ratios, wheel spin rate puzz Bob 10:05:23 05/24/04 (0)

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