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MOTORSPORTS · POWERTRAIN

MR27 Gearbox

Designing the in-hub planetary gearbox and upright assembly for Michigan FSAE's MR27 competition car.

FIG. 01 MR27 / GEARBOX ISO VIEW — NL
[ HERO IMAGE ] CAD render · isometric view of in-hub planetary gearbox assembly
Gearbox Lead
Jun 2026 — Present
MRacing FSAE
Siemens NX · Ansys Mechanical
In Progress
OVERVIEW

Overview

[ Overview placeholder — 2-3 paragraphs combining context and the design problem. Describe what MR27's gearbox is, why it matters to the car, and what's different from MR26. Cover the constraints you're designing within (packaging, weight, manufacturing, season timeline) and what makes the problem interesting. End with one sentence on your role and contribution. ]

[ Continue with relevant context that frames the rest of the page — competition format, the drivetrain subteam structure, integration with the rest of the car. ]

KEY CONSTRAINT

[ A specific, technical constraint that defines the design problem. Example: "Maximum diametric envelope of 165mm, weight target of 2.2kg per corner, peak torque output of 220Nm at 18,000 RPM input." ]

01

Approach

[ Your high-level methodology. Did you start with reference benchmarks, existing gearbox topologies, or first-principles calculations? Describe in 2-3 paragraphs. ]

  • [ Key decision 1 — e.g., chose 3-stage planetary over compound for packaging efficiency ]
  • [ Key decision 2 — e.g., specified case-hardened 9310 steel for gear blanks ]
  • [ Key decision 3 — e.g., relocated bearings to reduce overhang and improve stiffness ]
FIG. 02 — NL
[ APPROACH IMAGE ]Topology comparison sketches
02

My Role

[ Be specific about what YOU did vs. what the team did. Most important section for recruiters. ]

  • [ Owned all CAD modeling of the gearbox assembly in Siemens NX ]
  • [ Ran FEA on planet carrier and ring gear under peak load ]
  • [ Authored gear macro-geometry calculations and verified with KISSsoft ]
  • [ Coordinated with manufacturing sub-team on machinability reviews ]
  • [ Presented design reviews to drivetrain captain and faculty advisor ]
FIG. 03 — NL
[ ROLE IMAGE ]Workshop · CAD review · or in-shop photo
03

Design

[ Get technical here. Walk through the calculations, trade-offs, iterations. Use specific numbers. Cover gear macro geometry, strength verification (bending, contact), bearing life, lubrication, thermal considerations. ]

[ Continue with specifics. This is where engineering depth shows. ]

FIG. 04 — NL
[ FEA RESULT ]Planet carrier · von Mises stress
FIG. 05 — NL
[ DRAWING ]Gear macro geometry · section view
TARGETS
[ NUM ]kg
[ NUM ]Nm
[ NUM ]RPM
[ NUM ]mm
04

Goals

[ What does success look like for this project? Use future tense — "the gearbox will run on the MR27 chassis at competition in summer 2027" / "I will validate the FEA results with bench torsion tests before March" / etc. List the engineering targets, integration milestones, and timeline. ]

[ Continue with concrete short-term and long-term goals. Recruiters reading this want to see that you have a structured plan, not just an aspiration. Mention what would have to happen for the project to be considered a success at competition. ]

MR27 GEARBOX · DRAFT