PLANETARY GEAR
PLANETARY GEAR
(OP)
Im trying to put together a planetary gear, i have a 14 teeth sun and 3 planetary gears (22 teeth), for the outer gear can somebody tell me how to calculate the no. of teeth and the ratio on the whole system. The gear is a dp 3





RE: PLANETARY GEAR
Hope this helps.
Ravi
http://www.gearsandbearings.com
RE: PLANETARY GEAR
to verify the teeth no is correct, you also need the following equation
(teeth in ring gear+teeth in sun gear)/no of planet gear=interger.
RE: PLANETARY GEAR
planet gears, is this just a matter of the power to be applied and use?????
RE: PLANETARY GEAR
Are the sun and planet gears already made? Do you have complete specifications for them?
3dp is a fairly hefty gear - what is it for?
http://www.baymachinedesign.com
RE: PLANETARY GEAR
RE: PLANETARY GEAR
transfer more power/torque than that using three
planets.
There are many questions and answers in gear engineering.
RE: PLANETARY GEAR
Ricec, please post all you know about the gears you have:
outside diameters, root diameters, diameters over pins, profile shift, helix angle, etc.
What happens when you put the gears you have in mesh and check the center distance?
RE: PLANETARY GEAR
and would question the contact ratio for the
14/22 tooth combination. The 14.5 pressure angle
only ascerbates the situation as far as undercutting
and loss of tooth contact ratio. I assume these
are full depth teeth.
RE: PLANETARY GEAR
z1+2*z2+1=z3
(z1+z3)/n=integer this equation I have mentioned above
z1 number of teeth of sun gear,
z2 number of teeth of planet gear,
z3 number of teeth of ring gear,
n number of planet gears, placed in equal angle.
The first equation seems not right, but that gives sun gear room for positive profile shift coefficency.
14.5 PA, that doesn't make sense for winch, if that is only to avoid undercut of sun gear, the designer didn't think of the sun gear much.
RE: PLANETARY GEAR
data are in metric:
sun pinion z1=13 x=+0.593
ring gear z3=59 x=-0.373
center distance a=152.4
you can set the planet gears in 3 or 4, both are ok. but you need a carieer to keep them in place.