one way bearing mounting

[John in CR]

I got the shaft in the mail today, it's hardened and claims to be 60-65C http://www1.mscdirect.com/CGI/NNSRIT?PMPXNO=7155279&PMT4NO=0

I don't know how to calculate the differences, sorry! I bet BigMoose can though You gotta look at the sprague clutch at it's base level. It's a little rounded metal edge that gets pressed against a surface, and the friction between the two is the only force letting it transfer any torque. It must be lubricated to not wear while spinning in the unloaded direction, and yet the lubrication has a direct effect on the friction when it locks to transfer torque. A bit of high pressure lube, like moly grease, means instant slippage and destruction. The choice of lube must be something that can push out of the way and try to leave as minimal of a film between the surfaces as possible.

IMO, 1-way bearings have been a continous disappointment for me. Even Honda can't make them last in there auto-trannys (it works of course, but fails in time, or quickly when abused.) I've serviced cranes that used 5" diameter sprague clutches on the main hoist spool, and they fail just like all the other ones fail. Trying to grip a lubed smooth polished rounded hard surface with another smooth polished rounded hard surfaces is possible (due to crazy torque to force leverage happening on the little oval roller), but it's always been sorta a temporary unreliable band-aid type solution in my experience.

Eeek! So a dual belt 2 spd tranny using an over-running clutch bearing on the low gear side and toothed clutch to engage high gear is a bad idea in terms of dependability? Aren't there sprague type one way bearings that work more like freewheels in that the inner diameter part is rigidly attached to the shaft?

 

[TylerDurden]

This looks strong, but req's oil-pressure:

http://www.meansindustries.com/OneWayClutch.html

 

[Lyen]

Hi all, I'm considering using a one way bearing, but I've never used one before so I thought I'd throw some ideas out and see what you guys think.
I want to mount on a 1/2" hardened shaft so I'm looking at this bearing.
So mostly what I'm wondering is how it stays in place on the shaft? It seems like it would slide from side to side as it's rolling.
This could be prevented by mounting 2 collars on either side of the bearing, but that would create friction it seems.
Could side friction be prevented with a couple of these thrust bearings in between the collars?

If that sounds like a good mounting strategy the only other thing I'm wondering is the efficiency. I want to use a one way instead of using a freewheel because I'm assuming it will be more efficient when freewheeling due to lack of ratchet/pawls. Is that a correct assumtion? Do the one way bearings make any noise when freewheeling?
Thanks for reading

I see we have something in common. I have using the identical one way bearing. The is a thin metal & nylon rings on both ends to avoid friction when it was manufactured as a whole drive-train for the planetary system.

This is what you have referred to:

And this is what I have. The one way bearing is already pressed into the sprocket.

 

[mud2005]

http://www.bearingexperts.com/ONE_WAY_C ... Series.htm
No idea of the quality/manufacturer........

thanks Miles, I sent a request for a quote on a csk-40-pp bearing (has 2 keyways)

I'm looking into the possibility of turning a disc hub mount down to 40mm, carving in a keyway and slipping a csk-40 over it. then making an adapter to mount a large sprocket on the bearing. It's just an idea so far, not sure if it's possible or not I have to get a hub and do some measurements.

the csk-40 claims 385 Nm

 

[Miles]

the csk-40 claims 385 Nm

The torque figures they quote are completely out of line with anything else I've seen. Maybe they're for peak torque?

 

[liveforphysics]

It's an independent unit - it doesn't use the shaft as part of the clutch mech.

This type would have a huge advantage. The surfaces could be optimized to work together. Optimal surface roughness, hardness, and perhaps specialized surface coatings as well as the ability to seal in the optimal lube.

This is a huge step-up from the type which just slip over a shaft.