(I'm not sure where this would be on topic)
I need something to help drive a wheel. A bearing will be stuck on a
shaft that will be connected to a DC motor. The shaft cannot be
allowed to apply reverse force on the motor. I can explain further if
What I want is something like a ratcheting wrench uses. Apparently
there are ratcheting devices to drive the wheel of a bicycle but what
I've seen of those would be too large. It needs to be no more than
about 1 inch maximum diameter.
So, is there such a thing as a ratcheting bearing? Something similar?
What I mean by "ratcheting" is that the bearing will turn freely in
one direction but won't turn in the other direction.
On Fri, 17 Aug 2007 05:34:58 +0000, John Doe wrote:
The clicking sound on multi speed bikes is a ratcheting device that uses
dogs to engage teeth when pedaled and slip when coasting.
I believe you are looking for a Torrington bearing. These don't use teeth
and grip a smooth shaft in one direction and slip when the shaft rotates
at a slower speed than the bearing is being turned.
What you are describing is a sprag clutch. Commonly used on things
like lawn mower drive wheels and go Karts and many other things.
Mechanics will note these devices used as valve rotators in cylinder
Ordered some "One-Way Locking Steel Needle-Roller Bearings" from a big
online hardware store. There are some other devices that offer similar
functions (see the metalworking group too). All very cool. Thanks to
the reply authors.
I'm wondering if the inner part of the bearing rolls on the shaft
(with no inner race?), meaning the shaft would have to be smooth,
or if the needle bearing can be glued to the shaft. I couldn't tell by
the drawings. Mainly curious, I'll find out soon. Thanks.
Take a look at the dial mechanism in an old rotary dial phone. It uses
a speed regulator that is only engaged when the wheel is spinning back.
Western Electric used a spring clutch and Automatic Electric (GTE)
used a ratchet mechanism.
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