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OK To Use Involute Gears for Ratchetting?

OK To Use Involute Gears for Ratchetting?

OK To Use Involute Gears for Ratchetting?

(OP)
I want to design a double-sided pawl for a 12-pitch spur gear.

Is it ok to use involute gears for ratcheting?  Do you need to specifically design the gear with the pawl?

RE: OK To Use Involute Gears for Ratchetting?

There may be a clever way to do it, spanning multiple teeth, but a simple pawl engaging one involute tooth could be backdriven, i.e., made to slip, with sufficient torque.  That may not be what you want.

Mike Halloran
Pembroke Pines, FL, USA

RE: OK To Use Involute Gears for Ratchetting?

(OP)
Thanks Mike.  I was thinking of something like Example C on this page.

Are there any common resources for pawl design besides Machinery's Handbook?

RE: OK To Use Involute Gears for Ratchetting?

If the pawl pivot is far outside the gear's pitch circle, it might work okay, but you need to draw it and/or figure out the pressure angles to be sure.

Mike Halloran
Pembroke Pines, FL, USA

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