Re: Friction (clutch) lining

On Thu, 28 Jun 2007 18:53:40 +0100, "moray" <mtb_hyphen_rules@xxxxxxxxxxxxx>
wrote:



Inital figures for a 3500kg pull (dead pull, not rolling), with a reel
centre diameter of 100mm, gives a torque of 1746Nm at the reel.
Now reeling speed is still to be figured out, but probably looking at
something in the region of 100 rpm, so with a 5:1 ratio, I'm still looking
at 350Nm if I can fit the clutch on the input shaft. Having the clutch on
the input shaft is the key to this winch, as I want to minimize stack height
of the winch drum/clutch.

The commerical winches have the clutch working directly on the reel, and is
a disc of friction material rivetted to the driven sprocket, with the other
side pressing directly on the underside of the winch reel.

My main issue is finding the frictional co-effcient figures so I can work
out what size of clutch plate would be needed, aswell as a source of
suitable material. Dismantling a commercially available clutch is one
option, but I still need figures as the torque transmission is going to be
pretty critical, as it also acts as a slip clutch for overload protection.
The whole lot is going to be hydraulically controlled, so adjusting the
pressure of the thrust ram will be done to fine tune the clutch slip point,
but I still need to get in the ball park in the first place.

thanks
Moray



I may be wrong, but my sums say that you are in the range of a motorcycle
multiplate wet clutch (I'm thinking Triumph Bonneville or BSA A65 here...).

Conversely, a Ford Focus 2l engine produces 180Nm of torque apparently. So
that might give a basis to start looking from.



Mark Rand
RTFM
.

Relevant Pages

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