Bulldozer Geardown

Design Proposals

folder of first drafts

https://drive.google.com/folderview?id=0BwxMMqGvwTM-N092MnBGLU9CdU0&usp=sharing

Design Review

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Further Conceptual Design

• Bulldozer_Geardown_Conceptual_Calculations

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Initial Conceptual Design

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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

Notes: practical limit for 100 pitch ~ 36 teeth - or 15" OD - [1]

• Random shaiskizit - [2]
• Up to 240 pitch - [3]
• Martin - [4]
• Baldor - [5]

80#

• 1-7/8" bore 20T - [6]
• 1-7/8" bore 14T - [7]
• 1-7/8" bore 13T 2.3285" O.R. - [8]
• 2" bore 13T - [9]
• 2" bore 22T 3.79" O.R. - [10]

100#

• 2" bore dia, 11T, 2.504" O.R. - [11]
• 26 tooth - OD 11" - $10 - Surpluscenter - [12]
• 2.938" bore dia, 16T - $123 - [13]
• 2.938" bore dia, 25T, 5.3225" O.R. - [14]
• 2" bore dia, 25T - [15]

Sourcing Problems

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

Links

• LifeTrac Gear Module

product examples

• http://www.emerson-ept.com/EDGE/CAD/Detail.aspx?Type=EPT&PartID=PB1004