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Originally Posted by craigayl
, but if the countershaft gear is setting forward of the main shaft gear as it appears, the countershaft gear will exert way more force on the forward edge of the main shaft gear. This is the problem of an off set and what you see in the failed gears. The teeth start to fail at the forward edge of the main shaft gear and the destruction continues until the teeth are gone. I don’t think only looking at the contact pattern in the middle of the gear tells the whole story.
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Because the teeth are at an angle, the front leading edge of the tooth will engage first and as the gear rotates, the force will distributed towards the middle and then rear edge of the tooth, so the loading of the tooth through rotation is kind of complex. At any given time, one tooth will be loaded on the leading edge, while the tooth before it will be loaded in the middle, and the tooth before it will be loaded on the rear aspect of the tooth. I think a mechanical engineer with a background in gear design, transmission, would be the real person to get correct info from on what are the main factors for gear failure in this case scenario.