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2-speed gearboxes where a stationary caliper brakes/releases an external disc of a planetary system?

2-speed gearboxes where a stationary caliper brakes/releases an external disc of a planetary system?

2-speed gearboxes where a stationary caliper brakes/releases an external disc of a planetary system?

(OP)
Where an external fixed (non rotating) disc brake caliper brakes or releases a (rotating) disc to shift gear?
As to be easily serviceable by just replacing the worn caliper pads.

In most planetary transmissions I know of, brakes are applied but both parts keep rotating together and are not kept stationary.

Likely it will require 2 linked planetary sets just for two speeds.

Are there any such transmissions?

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