New to friction clutch

[Knight]

While restorting as harley rake I decided to add a slip clutch because of the damage encounter by rollers jamming, chain jumping sprokets and pillow block bearings breaking.
As I was removing the old coupling from the gear box, it had a friction clutch. I never seen one before. It had springs and little angled cylinders, which would slip under load. Maybe this clutch was frozen. Do friction clutches need grease? I like the slip type because I it has adjustment to it.
Are friction clutches a thing of the past. Does anyone have experience with them?

 

[leonz]

While restorting as harley rake I decided to add a slip clutch because of the damage encounter by rollers jamming, chain jumping sprokets and pillow block bearings breaking.
As I was removing the old coupling from the gear box, it had a friction clutch. I never seen one before. It had springs and little angled cylinders, which would slip under load. Maybe this clutch was frozen. Do friction clutches need grease? I like the slip type because I it has adjustment to it.
Are friction clutches a thing of the past. Does anyone have experience with them?

No grease, otherwise they are useless as a
method for the for the implement to prevent damage.

So it seems you have A Weasler brand torque limiter of some type
(ratcheting apparently) of which there are 4 current model types.