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FJR Motorcycle Forums
Technical & Mechanical Problems
What undercut gears look like
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<blockquote data-quote="Silent" data-source="post: 1121900" data-attributes="member: 4841"><p>The natural tendency of a straight cut gear dog is to push apart slightly. This is because the gears can twist slightly on the shafts. If the gears are in good shape, this is not an issue as the loads generated are not enough to separate them. However, when the gear dogs or slots wear and the gripping edge wears, then the tendency to push apart is increased to the point that it actually pushes them apart under heavy load. This results in popping out of gear.</p><p></p><p>By undercutting the dogs, you are changing the tendency of the gears from pushing apart, to pulling together, thus preventing the possibility of separating under heavy loads. The only drawback is it takes a more positive shift to change gears. They use the straight cut gears because they shift a bit smoother than the undercut ones.</p></blockquote><p></p>
[QUOTE="Silent, post: 1121900, member: 4841"] The natural tendency of a straight cut gear dog is to push apart slightly. This is because the gears can twist slightly on the shafts. If the gears are in good shape, this is not an issue as the loads generated are not enough to separate them. However, when the gear dogs or slots wear and the gripping edge wears, then the tendency to push apart is increased to the point that it actually pushes them apart under heavy load. This results in popping out of gear. By undercutting the dogs, you are changing the tendency of the gears from pushing apart, to pulling together, thus preventing the possibility of separating under heavy loads. The only drawback is it takes a more positive shift to change gears. They use the straight cut gears because they shift a bit smoother than the undercut ones. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
What undercut gears look like
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