Planetary Gear

OBJECTIVE:

1. To run motion analysis on Gear mechanism with 4 Planetary gears and obtain various results.

2. To Design the carrier, and gears depending upon the shaft diameter of the planet gears, and Assembling them in SolidWorks MBD.

THEORY:

A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sun gear A, several planet gears B, internal gear C and carrier D that connects planet gears as shown. it can realize the high reduction ratio through gears, however, it is a mechanism suited to a reduction mechanism that requires both small size and high performance such as transmission for automobiles.

Problem Statement:

Procedure:

CALCULATIONS:

Given:

Module =2.5

No. Of teeth in ring gear= 46

No. Of teeth in sun gear= 14

no. of Planet Gears =4

now, using gear train basic formula:

we know:

M=D(Diametric pitch)/T(No. of teeth)

M=2.5;

Dia(Ring gear)= Dia(sun gear) +2* Dia(planet gear)

M*Tr= M*Ts +2*M*Tp

46=14+2*Tp

hence, Tp=16

No. Of teeth in Planet gear= 16

Diametric Pitch = M*Tp = 2.5*16 = 40 MM

CAD MODELS :

ASSEMBLY:

Results:

Case 1:

Case 2:

Case 3:

CONCLUSION:

1. In case I; input to the sun gear and output at the carrier (ring gear fixed) was obtained, resulting in low speed and high torque transmitting capacity.

2. In case II; when the input to the ring gear and output the carrier(sun gear fixed).

3.In case III; when carrier is fixed and output is to be obtained from the ring gear the opposite happens.