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Posted by BobH on November 28, 2006, 8:34 pm
Please log in for more thread options Padu wrote:
> I'm almost finished mounting a magmotor dc motor/planetary gearbox onto my
> ATV steering shaft. I have a timing pulley on the shaft and another pulley
> on the output shaft of the motor. In order to protect the expensive gearbox
> I coupled the gearbox output shaft and the pulley shaft with a spider
> coupler.
>
> Everything was good, until I had to actually mount the thing to the ATV and
> the only way I had was to mount it upside down. Needles to say, the pulley
> gets disconnected from the spider because of gravity.
I am not really clear why the pulley separates from the coupler when
it's inverted, or why the pulley/coupler had to be inverted. If there is
space on the shaft, could you put a collar on the shaft to prevent the
pulley from falling down the steering shaft? Collars are very easy to
make if you can't find one commercially. If you are not in a terrible
hurry, and you can't find one already made, I'll trade you a collar with
your specified dimensions (up to say 4" OD, 1/2" thick) for two six
packs of stout or porter beer from a local (to you) microbrewery. I am
near Phoenix, AZ.
> The other thing that crossed my mind is: with a timing belt, do I really
> need a spider coupler (instead of a rigid coupler)? Doen't the belt work as
> a shock absorber? Will it skip a teeth if a sudden and strong torque is
> applied to it? (i.e. the wheels hit the curbside at an angle).
It depends on the size of the belt. The narrow ones with fine pitch will
skip pretty readily. An inch wide belt with 1/4" teeth will transmit a
serious shock to your gearbox. How much you tension the belt will also
be a factor in this.
> I don't know if you'll be able to get the picture from my summarized words,
> if not, ask for clarification.
A photo would help.
Regards,
Bob
Note the Munged email address.
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> ATV steering shaft. I have a timing pulley on the shaft and another pulley
> on the output shaft of the motor. In order to protect the expensive gearbox
> I coupled the gearbox output shaft and the pulley shaft with a spider
> coupler.
>
> Everything was good, until I had to actually mount the thing to the ATV and
> the only way I had was to mount it upside down. Needles to say, the pulley
> gets disconnected from the spider because of gravity.
>
> Can you think of any other type of coupler that 1) will absorb some impact
> 2) it's not too expensive 3) does not get disconnected if forces are applied
> outwards
>
> The other thing that crossed my mind is: with a timing belt, do I really
> need a spider coupler (instead of a rigid coupler)? Doen't the belt work as
> a shock absorber? Will it skip a teeth if a sudden and strong torque is
> applied to it? (i.e. the wheels hit the curbside at an angle).
>
> I don't know if you'll be able to get the picture from my summarized words,
> if not, ask for clarification.