Re: Friction (clutch) lining


"Mark Rand" <randm@xxxxxxxxxxxxxxxxx> wrote in message
news:kj78835n4k1meovu9lrv4ppshf3a75e86f@xxxxxxxxxx
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...).

They might manage it a few times, but your average vehicle clutch, doesn't
need to be engaged under full torque/load very often. I know the speeds I'm
considering burn out shouldn't be an issue, but sheering is. And sheering
when you've got a 60ft tree balanced with the winch is not really an option!

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

I have considered using a clutch plate from a vehicle, but instead of
driving it through the centre as it would be in a vehicle, have it so when
engaged, it's clamped between the driven and non-driven plates, but I'm not
entirely sure how the clutch plate would react. This is still a serious
option.


.

Relevant Pages

  • Re: Friction (clutch) lining
    ... Inital figures for a 3500kg pull (dead pull, not rolling), with a reel ... gives a torque of 1746Nm at the reel. ... at 350Nm if I can fit the clutch on the input shaft. ...
    (uk.rec.models.engineering)
  • Re: JVC VCR HR-S4700U quickly powers down
    ... Does seem like a problem with the reel clutch. ... > After setting up the above (without vhs tape) and powering on the VCR ... It only moves down slightly then stops and the mode motor ...
    (sci.electronics.repair)
  • Re: JVC VCR HR-S4700U quickly powers down
    ... >> Does seem like a problem with the reel clutch. ... > slide the idler gears into the supply reel. ... retainer can be removed and re-used, but there is a chance that it will be ...
    (sci.electronics.repair)
  • Re: JVC VCR HR-S4700U quickly powers down
    ... > Does seem like a problem with the reel clutch. ... When I rotate the clutch manually in a particular direction it does ... slide the idler gears into the supply reel. ... This test was done with the VCR off. ...
    (sci.electronics.repair)
  • Re: 30-70 Times...
    ... highest bhp part of the power curve. ... stock up on clutch plates for the R1 engine first though. ... Well the smell of burning clutch when you tried to pull away having ... low revs or very little torque at high revs. ...
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