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Last Updated: November 2020
Europa lander gearbox for Prototype Testing
Europa lander gearbox for Prototype Testing
NASA Jet Propulsion Lab
NASA Jet Propulsion Lab
This gearbox is used in the Europa Lander planetary sampling group to test prototype excavation methods.
Europa Lander Mission Concept
Full Assembly
Hand drill volume for scale and maximum blade size
Considerations
Considerations
Bearing and bevel gear loads, shaft torsion and bending, fit clearances, and CNC milling constraints.
Section View
Analysis
Analysis
Solved for minimum shaft size using von Mises stress from blade loads and beveled gear loads with a FOS of 1.5 (416 steel yield stress/von Mises stress).
Also ensured axial load from gears will not exceed breaking force of pin. Validated hand calculations using static SolidWorks simulations.
Blade Loads
Beveled Gear Loads
rack & pinion housing
rack & pinion housing
Bulldog Racing (Baja SAE)
Bulldog Racing (Baja SAE)
This rack and pinion steering design is 30% lighter than the previous year with a safety factor of 2.76.
Analysis
Analysis
Assuming a 2G turn, the equation for the force through the outer tie rod was derived using static analysis and used to calculate the force translated to the housing through the rack and pinion.
Shifting mechanism
Shifting mechanism
Bulldog Racing (Baja SAE)
Bulldog Racing (Baja SAE)
The goal of this year's shifter design was to reduce weight and increase serviceability. This was achieved by implementing a bolted aluminum assembly that is welded to the vehicle’s chassis.
Climbing Subsystem
Climbing Subsystem
FIRST Robotics Competition
FIRST Robotics Competition
This mechanism can lift a 120lbs robot four feet up a rope in 14 seconds. The gear box was designed for speed and reliability, with a 1:115 gear ratio giving it about 118 ft/lbs. of torque.The plates were designed using Solidworks and manufactured in house using a CNC router.
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