Helical Planetary Gear

Piyush Kushwaha

13 Aug, 2021 05:43 PM

Helical Planetary gear can look complicated in designing but believe me it's as simple as designing normal gear .

Planetary gear seems to be very complicated while designing in any cad software like Fusion 360 , SolidWorks etc. But this tutorial is very easy way to make Planetary gear with wide range of gear ratio provided you should have basic knowledge about gear ratio ,gear physics .

This tutorial is for fusion 360 Beginners and intermediate .

Here you can learn some tricks while learning design .

for more check out my youtube channel :- Power Stroke (https://www.youtube.com/channel/UCysf0V1RMkwIHP2j8ixVQew)

1. Step 1: Tutorial of Planetary Gear

   
   

2. Step 2: Gear dimensions and calculations

   

   

   

   
   

   
   

   
   

   
   

3. Step 3: Ring gear

   To make ring gear

   
   

   
   

   • Add spur gear of 96 teeth , modulus will be 1 and click ok.
   • Now check sketch , select upper face of spur gear as a plane and project the spur gear diagram on to the plane.
   • Add another circle of diameter 110 (must be greater than 96 mm for making ring gear type).
   • Now enable 3d sketch and draw a vertical line of 15 mm and finish the sketch.
   • Select sweep command and select ring gear diagram and direction will be that vertical line.
   • Twist angle will be 15deg and operation will be new component.

   

4. Step 4: Planet Gear

   Again open spur gear plug in and follow these steps

   
   

   
   

   • No. of teeth will be 36 with modules 1.
   • Also don't forgot to add backlash (any value between 0.1 to 0.5).
   • After adding spur gear click on sketch ,select upper face of spur gear as plane.
   • Project the spur gear on the plane.
   • Draw vertical line of 15mm and finish the sketch.
   • Now apply sweep operation, select the drawing and direction will that vertical line.
   • Calculation for twist angle is

   angle = 15 *(Nr/Np)

   angle = 15 * (96/36) = 40deg

   • Place this helical gear with the help of move command and also create two copy .

   

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5. Step 5: Sun Gear

   Add another spur gear with given specs

   • No. of teeth will be 24 and module 1.
   • No backlash required.
   • Now again project the gear sketch.
   • Add vertical line of 15 mm.
   • Apply sweep operation with twist angle given as

   angle = 40*(36/24) = -60 deg

   ### Important * In the given video i mistakenly add twist angle 60 deg but it will be -60 deg *

   Now align the gear teeth with planet gears.

   

   
   

   
   

6. Step 6: Carrier

   I think video will be enough for carrier design.

   

   
   

   
   

7. Step 7: Assign joint

   Use as build joint operation keeping ring gear grounded.

   Refer to video for any help .

8. Step 8: Add Motion Links

   • Motion link between sun to carrier with sun gear angle 360 and carrier angle 360/5 .
   • Motion link between sun gear and each planet gear with sun angle 360 + 360/(96/24) and planet gear angle 360/(36/24.)