Planetary Gear
AIM: TO ANALYSE THE MOTION STUDY OF PLANETARY GEAR MECHANISM USING SOLIDWORKS.
Design considerations
Ring Gear
- Module = 2.5 (You must use the metric system in design modeller)
- Number of teeth = 46
Sun Gear
- Number of teeth = 14
- Input Speed of the Gear = 200 rpm.
- Number of planet gears = 4
The dimensions of the carrier depending on the shaft diameter of the planet gear.
OBJECTIVE:
To create 3D models for all parts.
To perform motion analysis by rotating the input gear at 200 rpm.
To obtain a plot for Angular velocity of the output.
To export the results to a spreadsheet.
With the above input parameters, are going to run a simulation on the following cases,
|
Sl.No |
Input |
Output |
Fixed |
|
1 |
Sun Gear |
Carrier |
Ring Gear |
|
2 |
Ring Gear |
Carrier |
Sun Gear |
|
3 |
Sun Gear |
Ring Gear |
Carrier |
Theory of planetary gear
PLANETARY GEARS: PRINCIPLES OF OPERATION
Planetary Gears: Principles Of Operation
Planetary gears are at the heart of modern engineering and are used in gearboxes that power everything from basic plant machinery to cutting-edge electric vehicles. The simple configuration of a central drive and orbiting gears was developed thousands of years ago to model the movements of the planets. Today, engineers use planetary gears in applications that demand high torque density, operational efficiency and durability. In this article, we explore the principles of operation, how planetary gears work, and where you might find them.
What Is A Planetary Gear Set?
A simple planetary gear set is made up of three main components:
- The sun gear that sits in the centre (central gear).
2. Multiple planet gears.
3. The ring gear (outer gear).
The three components make up a stage within a planetary gearbox. For higher ratios we can offer double or triple stages. Planetary gearboxes can be powered by either electric motors, hydraulic motors or petrol or diesel combustion engines. The load from the sun gear is distributed to several planetary gears which can either be used to drive an outer ring or a shaft or spindle. The central sun gear takes a high-speed, low-torque input. It drives several rotating external gears which increases the torque. The simple design is a highly efficient and effective way of transferring power from a motor to an output. Approximately 97% of the energy input is delivered as an output.
What Are Planetary Gears Used For?
Planetary gear sets can be used for a variety of purposes. At Lancereal, we provide planetary gear sets for use in industrial and mobile applications.
planetary gearboxes are used in:
- Wheel drives
- Track drives
- Conveyors
- Slew drives
- Hoist drives
- Mixing
- Winch drives
- Pumps
- Coil tubing injectors
- Auger & drilling drives
- Cutter head drives
- Calculations:-
Formulas
The circular pitch p=d/z
The module m=d/z
The pitch diameter d=mz
Where, m= module (mm)
d=diameter (mm)
z=Number of teeth’s
For Ring gear:
Module(m) = 2.5
Number of teeth(z) = 46
So, Pitch circle diameter(d) = m*z = 2.5*46 = 115
For Sun gear:
Module(m) = 2.5
Number of teeth(z) = 14
So, Pitch circle diameter(d) = m*z= 2.5*14 = 35
For Planet gear:
Module(m) = 2.5
Number of teeth(z) =?
Pitch circle diameter(d)=?
So,
Pitch circle diameter of Planet gear = Pitch circle radius of ring gear - Pitch circle radius of sun gear
= 577.5-17.5
Pitch circle diameter of Planet gear =40mm
Now we calculate Number of teeth(z)
Z=d/m
=40/2.5
Number of teeth(z)=16
3D MODELS OF PLANETARY GEARS
1.RING GEAR
2.SUN GEAR
3.PLANET GEAR
4.Transmission shaft
- Assembly
1. Study-1 (Ring gear is Fixed and input is provided to Sun gear)
* Input gear speed to 200 rpm *
*contacts between the parts*
*plot for Angular velocity*
Animation Video link
https://youtu.be/861lkYfHeJk
PLANETARY GEAR MECHANISM ASSEMBLY RING GEAR FIX animation video
- Study-2 (Sun gear is fixed and input is provided to Ring gear)
*Input gear speed to 200 rpm*
*contacts between the parts*
*plot for Angular velocity*
Animation Video link
https://youtu.be/kndsfVu7T7U
PLANETARY GEAR MECHANISM ASSEMBLY sun GEAR FIX animation video
- Study-3 (Carrier is fixed and input is provided to Sun gear)
*Input gear speed to 200 rpm*
*contacts between the parts*
*plot for Angular velocity*
Animation Video link
PLANETARY GEAR MECHANISM ASSEMBLY carrier FIX animation video
google drive link
for Results,3D Models, spreadsheet
https://drive.google.com/drive/folders/1gelr_rB2xSFz2eILiPyhTOTtk7N36UbX?usp=sharing