Bearing Housing

Subteam: ChassisSubsystem: SteeringAssembly: Steering ShaftCars: CR21, CR22, CR25, CR26I, CR26E

Purpose

Supports the steering column in the frame and locates it radially.

Function

Houses the bearings the column runs in so the column cannot deflect under steering load, which would show up as vague steering feel.

Design Process

No part-specific design process is documented. The Steering subsystem design process applies: 1. Kinematics sets steering geometry, Ackermann targets and rack travel. 2. Size the column and shafts for torsional stiffness and for the bearing housing that supports them. 3. Calculate static steering force from the tire and geometry, and check it against anthropometric limits. 4. Design the wheel shell around the button and switch layout and the dash sightline; prototype grips and take driver feedback. 5. Validate steering effort and Ackermann on track, using the alternate tie rod mounts to sweep setups.

Manufacturing Process

Milled on the CNC.

Full Material List

Aluminium housing, ball bearings.

Reoccuring issues

Fault Vault, CR25: play in the steering column from a loose rack-to-column fit and from oversized, off-centre bolt holes. CR26E added an additional centre column support bearing to address it.

Still to document

Nothing in CrimsonStorage covers these yet.

Design Constraints — What held back the design whether it be location, time, materials etc
Analysis — How you get quantitative, predictive information on the part
Improvements — Improvements for this generation
Properties — Size, weight, mass, charge, thermal properties, anything else relevant