MBD Simulation of Planetary Gear System using SOLID-WORKS.

AIM:

Constructing a Planetary gear system with four planet gears and analyzing the angular velocities for different cases

INTRODUCTION:

Planetary Gear System or an epicyclic gear train is used to set different gear ratios by using three sets of the gears sun gear, planet gear, and ring gear.
All the planet gears are mounted to a single rotating member, called a cage, arm, or carrier where the output is obtained.

A planetary gear set is comprised of an outer gear ring that's called the ring gear. As they rotate inside of the ring gear, the planetary gears create pitch circles that can be formed into a gear train that, in turn, is hooked up to input and output shafts.

Where are Planetary Gear Systems Used?

Planetary gears are often used when space and weight are an issue, but a large amount of speed reduction and torque are needed. This requirement applies to a variety of industries, including tractors and construction equipment where a large amount of torque is needed to drive the wheels. Other places you will find planetary gear sets include turbine engines, automatic transmissions, and even electric screwdrivers.

Planetary gear systems are able to produce a lot of torque because the load is shared among multiple planet gears. This arrangement also creates more contact surfaces and a larger contact area between the gears than a traditional parallel axis gear system. Because of this, the load is more evenly distributed, and therefore the gears are more resistant to damage.

Ring Gear

• Module = 2.5
• Number of teeth = 46

Sun Gear

• Number of teeth = 14
• Input Speed of the Gear = 200 rpm.
• Number of planet gears = 4

Planetary Gear

• Number of teeth in Planetary Gear = 40/2.5 = 16

ANALYSIS:

Case 1: Fixing the Ring Gear, giving input to the sun gear and receiving output at the carrier

Contact Force B/W Planetry gear and Ring gear.

Case 2: Fixing the Sun gear, giving input to the Ring gear and receiving output at the carrier

Contact Force B/W Planetry gear and Ring gear.

Case 3: Fixing the carrier gear, giving input to the sun gear and receiving output at the ring

Contact Force B/W Planetry gear and Ring gear.

Conclusions

• When Sun gear is input gear, the required speed is achieved within a short duration of time. But when ring gear is input gear, the required speed is achieved linearly with time.
• The output speed has small disturbances due to collisions between the gear tooth.