Bulldozer Geardown: Difference between revisions
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*2" bore dia, 25T - [http://www.amazonsupply.com/dp/B0045I83IY/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 | *100# chain sprokets hard to find | ||
*80# chain sprokets with bore dia above 2" hard to find | *80# chain sprokets with bore dia above 2" hard to find | ||
Revision as of 04:02, 2 June 2013
Design Proposals
folder of first drafts
Design Review
Further Conceptual Design
Initial Conceptual Design
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
LifeTrac Existing Design
- LifeTrac - LifeTrac_III frame documentation
- Quick Connect Wheels - shows dimensions
Parts
Sprockets
80#
- 1-7/8" bore 20T - [5]
- 1-7/8" bore 14T - [6]
- 1-7/8" bore 13T 2.3285" O.R. - [7]
- 2" bore 13T - [8]
- 2" bore 22T 3.79" O.R. - [9]
100#
- 26 tooth - $10 - Surpluscenter - [10]
- 2.938" bore dia, 16T - $123 - [11]
- 2.938" bore dia, 25T, 5.3225" O.R. - [12]
- 2" bore bia, 11T, 2.504" O.R. - [13]
- 2" bore dia, 25T - [14]
Sourcing Problems
- 100# chain sprokets hard to find
- 80# chain sprokets with bore dia above 2" hard to find