Re: Sprag Clutches

["Eric Poulsen" <epoulsen@htsinteractive.com>]

Are you using this in a "dry" application or immersed in oil?

It's my (limited) understanding that the roller type of clutch has limited
speed and torque capabilities, while the sprag type is better suited to
high torques and high overrun speeds.

Unfortunately, many the sprag clutches that I've found need to be operated
in oil.

-- Eric


At 09:08 AM 10/30/99 , you wrote:
>Hi-
>The Volvo automatic I took apart to build the two speed tranny for
>Dragon
>Parade had two sprague
>clutches. One with about a 1.375 bore the other with better than 2 in.
>bore.
>For my application I had to make and heat treat my own races. The
>sprague
>unit looked a bit wimpy but did stand up to a 13.89 et in the quarter
>mile.
>I have
>recently taken apart a turbo 350, it has a large roller ramp clutch
>whitch I
>plan to use in my next design. The inner race
>will have to be custom built, but I will try to use the outer ramped
>race
>from the 350. It would be a much more
>difficult machining job. The roller unit can be purchased from a
>transmition
>repair shop, about $35 . The sprague unit may also be avalable (easier
>to
>use, round races no ramps).
>Father Time- Burien Wa.
>
>
>Eric Poulsen wrote:
>
>> I didn't realize that auto trannys HAD one ... are you pulling my leg?
>>
>> -- Eric
>>
>> > -----Original Message-----
>> > From: owner-ev@listproc.sjsu.edu [mailto:owner-ev@listproc.sjsu.edu]On
>> > Behalf Of Lee Hart
>> > Sent: Wednesday, October 27, 1999 7:45 PM
>> > To: ev@listproc.sjsu.edu
>> > Subject: Re: Sprag Clutches
>> >
>> >
>> > Eric Poulsen wrote:
>> > > Does anyone know of a good source for high delta speed (3000-3500),
>> > > high torque (> 100 ft-lbs) sprag (overrunning) clutches?
>> >
>> > How about one out of an automobile automatic transmission?
>> >
>> > --
>> > Lee A. Hart                     Ring the bells that you can ring
>> > 4209 France Ave. N.             Forget the perfect offering
>> > Robbinsdale, MN 55422 USA       There is a crack in everything
>> > phone (612) 533-3226            That's how the light gets in
>> > leeahart@earthlink.net                  Leonard Cohen
>> >
>> >
> 
________________________________________________________
Eric Poulsen
Application Developer / ÜberGeek

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