Bulldozer Geardown

Design Proposals

incomplete https://docs.google.com/file/d/0BwxMMqGvwTM-dWRaUk42LW1QVGs/edit?usp=sharing

Initial Conceptual Design

edit

Design Conditions of Satisfaction

• Uses exising Quick Connect Wheel rotor - its shaft output.
• Geardown module is CNC cut from 1/2" steel sheet
• Notches are made such that the structure can be assembled only one way
• Mechanism for quick disassembly is included
• Mechanism for tensioning the chain drive is included
• Enclosure allows easy replacement of parts
• Quick attachment of wheel onto the output shaft of geardown module is possible
• Wheel is secured via a keyway
• Input shaft is 1-7/8" thick, output shaft is 3" thick
• Standard cold rolled shaft is used
• Mechanism for retaining axial thrust is included
• Geometry must line up for the connection to Quick Attach Wheel
• Guards protect any exposed chains/sprockets for safety
• Method of coupling to existing Quick Connect Wheel must be used - via chain drive - while considering geometry of frame a drive components
• Quick Connect Wheel and Geardown units must be sufficiently stable to maintain chain tension. Tightening mechanism must lock in place.
• Reference must be provided to verify existence of off-shelf parts
• 100 Pitch Chain must be used.
• Concept must show approximate dimensions (+/- 2") of the geardown structure
• Geardown unit must be no more than 250 lbs in weight

Further Conceptual Design

• Bulldozer_Geardown_Conceptual_Calculations

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LifeTrac Existing Design

• LifeTrac - LifeTrac_III frame documentation
• Quick Connect Wheels - shows dimensions

Parts

sprokets

http://www.amazonsupply.com/roller-chain-sprockets/s/16411641

http://www.ggmfg.com/Products/Sprockets/WELDASPROCKETS.aspx

http://www.martinsprocket.com/sece_toc.htm

http://www.baldor.com/pdf/CA4000_Catalog/PT14_sprocket.pdf

80#

1-7/8" bore 20T

http://www.surpluscenter.com/item.asp?item=1-2145-20-N&catname=powerTrans

1-7/8" bore 14T

http://www.surpluscenter.com/item.asp?item=1-2145-14-N&catname=powerTrans

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

http://www.amazonsupply.com/dp/B00452TICU/ref=sp_dp_g2c_asin

2" bore 13T

http://www.surpluscenter.com/item.asp?item=1-2145-13-P&catname=powerTrans

2" bore 22T 3.79" O.R.

http://www.surpluscenter.com/item.asp?item=1-2145-22-P&catname=powerTrans

100#

2.938" bore dia, 16T

http://www.amazonsupply.com/dp/B0045I832U/ref=sp_dp_g2c_asin

2.938" bore dia, 25T, 5.3225" O.R.

http://www.amazonsupply.com/dp/B0045I83J8/ref=sp_dp_g2c_asin

2" bore bia, 11T, 2.504" O.R.

http://www.amazonsupply.com/dp/B0045I82UI/ref=sp_dp_g2c_asin

2" bore dia, 25T

http://www.amazonsupply.com/dp/B0045I83IY/ref=sp_dp_g2c_asin

sourcing problems

• 100# chain sprokets hard to find
• 80# chain sprokets with bore dia above 2" hard to find

Links

• LifeTrac Gear Module