Posted by Hastings Wyman on October 31, 2002 at 10:30:08:
In Reply to: Influence of offset in Hypoid gear set posted by Fabrizio on October 16, 2002 at 06:46:32:
Typically, positive hypoid offset does several things:
1.) increases the size of the pinion, strengthening the gearset
2.) introduces sliding velocities lengthwise across the tooth, which tend to make lapping faster and easier (no pitch line pattern concentration after lapping)
3.) increases the contact ratio (tooth overlap) of the meshing action, resulting in smoother (quieter) operation
4.) requires EP (extreme pressure) additives in the gearset lubrication to prevent scoring
5.) if large enough, allows a straddle mounted pinion (e.g. Ford 9 inch design), again increasing the load carrying capacity of the gearset
6.) reduces the efficiency of the gearset (increases the oil temp)
Again, these are broad generalizations. Each individual application should be analyzed over many criteria.
Hope that helps.
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