Remote Controlled Transmission with Reverse

Heptathalon Events:

• Agility - traverse between two lines 1m apart

• Strength - pull a weight up an incline of 15 degrees

• Speed - drive through a 6m obstacle course

• Weight - as little as possible

• Size - as small as possible

• Quality - build quality and theme

Constraints:

• One servo and one drive motor

• Must travel forwards and backwards without reversing motor direction

• Manufacturable with rapid protoyping methods

Our Design:

• Red Bull-themed, fully remote-controlled car​

• Dog-clutch mechanism w/ constant mesh gears​

• 3-speed actuator barrel​

• 10:1 final gear ratio for high-torque geartrain ​

• 2:1 final gear ratio for high-speed & reverse geartrains

• Controlled using Arduino, sensor shield, L298N motor driver, IR sensor, and IR remote

Prototype Learnings (Positives)

• Constant mesh gears ran smoothly

• Dog clutch engaged gears well

Prototype Learnings (Improvements)

• Hub and dog clutch would bind

• Cutch prongs had too much angluar slop and axial stiffness

• Barrel actuator had too much friction

• Servo engagement was too loose

Split "outie" drive barrel and seperate servo adapter