Gear repair

Not Enough Information

Whats being driven, type motor, type motor controls ect

Torque reversals. Can be caused by torsional vibration.

As OZZB has stated you need to provide more information.

Two common causes of spur gear jerking are:

1) The driven member or load is permitted to over-run (move faster than) the driver.

2) There is not enough clearance between the mating teeth and the gears are binding.

Without more information I can't be more specific.

Hope this helps

mechtech

Sir,

A mismatch in pressure angles will cause jerking (tooth to tooth binding). The popular pressure angles are 14.5 and 20 degrees for gears .... 30 & 45 degrees for splines/serrations. Please post the outside diameters and number of teeth for these gears. Each pressure angle will have a specific span measurement over x number of teeth. With this data, we can determine the pressure angles of your gears.

By the way, make sure you have reasonable backlash between the gears.

Regards,

jncerra

If everything else is working perfectly, and if always at the same RPM, it might be a resonance effect. the gear will rarely be completely jerked, but will always be accompanied with noticeable vibrations. Solution to this kind of problem is usually very easy, just make it resonate in a different frequency by even changing a bolt, moving a part slightly or alike.

Hope it helps,

Wangito

In the event your assembly is a girth and pinion assembly, there is a possibility that the girth gear is running eccentric to the shell. This will cause the teeth of the pinion to get root bound, causing the jerk.

Daniel

Not all gear tooth profiles are the same, when designing gears there can be a addendum and dedendum correction. Spur gears usually have a positive addendum correction to strenghten the tooth root. Perhaps there is a mismatch between gears, and the jerking possibly load related?

regards JD.

My thoughts agree.

If the gears are very close but not just so, then a riding effect will occur, where the jerking is actually the gear mesh falling back into alignment.

cr3