Flexible coupling: Oldham coupling
Placid Industries
When a brake or clutch is foot mounted, and connected to a fully supported shaft, a flexible coupling must be used.
Since perfect shaft alignment is impossible, flexible couplings are needed to protect the bearings from destructive side loads.
Oldham style - 3 piece design . . . 2 hubs and 1 black disk. Disk groove slides along hub's tenon, to allow for misalignment.
Beam style - 1 piece design . . . Spiral slit flexes to allow for misalignment.
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