Planetary Gear
AIM:
Constructing a Planetary gear system with four Planetary gear and analyzing the angular velocity for different cases.
INTRODUCTION:
Plnetary gear system or an epicyclic gear train is used to set defferent gear ratios by using three sets of gear sun gear,planetary gear and ring gear. All the planet gear are mounted to single rotating member called a cage,arm or carrier. Where the output is obtained. Planetgears for their size engage a lot of teeth as they circle the sun gear therefore they can eazily accommodate numerous turns of the driver for each an increase in load capacity and torsional rigidity. The more divided the load the less deflection and wear of gear teth.
Constructional dimensions:
Ring gear-
Module=2.5
Number of teeth =46
Diameter =46*2.5=115mm
Sun gear-
Module= 2.5
Number of teeth= 14
Diameter =35mm
Planetary gear-
Number of gear=4
Module= 2.5
Number of teeth=16
Diameter=40mm
Carrier-
The dimensions of the carrier depend on the shaft diameter of the planet gear.
Assembled parts view-
Motion analysis:
There are three cases, each one input gear rotates at 200RPM and motion study done for 5 seconds.
| Sl.No | Input | Output | Fixed |
| 1 | Sun Gear | Carrier | Ring Gear |
| 2 | Ring Gear | Carrier | Sun Gear |
| 3 | Sun Gear | Ring Gear | Carrier |
Case 1: Fixing the ring gear, input to the sun gear and output from carrier
Case 2: Fixing the sun gear, input to the ring gear and output from carrier
Case 3: Fixing the carrier, input to the sun gear and output from ring gear
INFERENCES:
In the first case where input is given to Sun gear and output is taken from Carrier when Ring gear is fixed. The output angular velocity of the carrier is near 300deg/sec. In the second case where input is given to Ring gear and output is taken from Carrier when Sun gear is fixed. The output angular velocity of the carrier is near 900deg/sec. In the last case where input is given to sun gear and output is taken from Ring gear when Carrier is fixed. The output angular velocity of the carrier is near 350deg/sec. So the angular velocity obtained is maximum in Case2.
Links of part files:
https://drive.google.com/file/d/1Q9AoVKfDOkityzL2dmJHEVvZ5LVghA9t/view?usp=sharing
https://drive.google.com/file/d/118qSUYIIpDWuHC5DDyK6OtTN923L3DBh/view?usp=sharing
https://drive.google.com/file/d/1wEpsudjc5CIq64D07B_HVjY83lPCYUWa/view?usp=sharing
https://drive.google.com/file/d/1PYrdIVglUbn1826lVC1xQtC6MJdBt4Co/view?usp=sharing
https://drive.google.com/file/d/1NF1fLnzzQUuS_28Vo0E278W61xk_D7XW/view?usp=sharing