Bulldozer Geardown Conceptual Calculations

Core Calculations

Roller chain and sprocket.

From Roller Chain Strength Table - the working strength of 100 pitch chain is 5000 lb. The 15,000 Inch Pound Motors provide 3x this force at 1" radius. For us to allow operation within working strength of single chain - we need to use a 3" radius sprocket, where force will be 1/3 of the rated 15,000 lb at 1" radius. this indicates that we would go from 3" to 6" sprocket to make everything fit:

edit

Designs

1

motor

1-7/8" shaft

13T 80# sproket 1-7/8" bore 2.3285" O.R.

box

2" shaft

22T 80# sproket 2" bore 3.79" O.R.

11T 100# sproket 2" bore 2.504" O.R.

3" shaft

25T 100# sproket 2-15/16" bore 5.3225" O.R.

• 1.692:1
• 2.272:1

3.84

2

motor

1-7/8" shaft

14T 80# sproket 1-7/8" bore

box

2" shaft

22T 80# sproket 2" bore

11T 100# sproket 2" bore

3" shaft

25T 100# sproket 2-15/16" bore

• 1.571:1
• 2.272:1

3.57

3

motor

1-7/8" shaft

13T 100# sproket 1-7/8" bore 2.9105" O.R.

box

2" shaft

25T 100# sproket 2" bore 5.3225" O.R.

11T 100# sproket 2" bore 2.504" O.R.

3" shaft

25T 100# sproket 2-15/16" bore 5.3225" O.R.

• 1.923:1
• 2.272:1

4.37

4

motor

1-7/8" shaft

13T 100# sproket 1-7/8" bore 2.9105" O.R.

box

2" shaft

25T 100# sproket 2" bore 5.3225" O.R.

11T 100# sproket 2" bore 2.504" O.R.

3" shaft

36T 100# sproket 3020 3. taper bore 7.5625" O.R.

• 1.923:1
• 3.272:1

6.29

5

motor

1-7/8" shaft

11T 100# sproket 1-7/8" bore 2.505" O.R.

box

2" shaft

25T 100# sproket 2" bore 5.3225" O.R.

11T 100# sproket 2" bore 2.504" O.R.

2-15/16" shaft

22T 100# sproket 2-15/16" bore 4.72" O.R.

• 2.272:1
• 2:1

4.54

6

11

45

links

• http://en.wikipedia.org/wiki/Gear_ratio