Gearmotor Clutch to protect output gear

Question

Gearmotor Clutch to protect output gear

plasgears (Mechanical)

(OP)

18 Dec 02 14:14

Any suggestions for a simple clutch to protect an output gear from self destruction? A gearmotor can generate 2-3 times the published stall torque depending on the dynamics of the system.

plasgears (Mechanical) · Answer 1 · 2002-12-18 16:31:16

Additional info: 0.5-1.0 HP
Application: automotive, comm'l

diamondjim (Mechanical) · Answer 2 · 2002-12-19 06:31:32

Why not put a limit switch on the
output of the motor? Is it hydraulic,
electric or ? I think this would be
a cheaper solution.

plasgears (Mechanical) · Answer 3 · 2002-12-20 10:16:14

My preference is limit switches in this electrical actuator, but the customer sometimes dictates the config. Another approach is a current limiter, which creates high resistance at overload. Upon removing the voltage, the current limiter quickly resets. The current limiter is not an option here because there is one already: slow acting and rated at high current.

plasgears (Mechanical) · Answer 4 · 2003-01-14 13:38:22

The following designs went to production:

- Gear on shaft with collar; belleville spring behind it with adj nut. A little complex but compact.

- A one way ratchet clutch made from plastic. The tapered fingers were acetal. A two way clutch could be made the same way by changing 90 deg stops to 45 deg.

- USA Tolerance Rings (dot com) is showing a tolerance ring for limited slip gears on shafts. The mfr says that it has to be developed on an individual basis.

Any other ideas for simple clutches?

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Gearmotor Clutch to protect output gear