Crimson Racing Wiki

Tripod Insert

Subteam: SuspensionSubsystem: Wheel HubsAssembly: Rear Wheel HubCars: CR21, CR22

Purpose

Alternate BOM naming for the CV insert.

Function

See the CV Insert entry.

Design Process

No part-specific design process is documented. The Wheel Hubs subsystem design process applies: 1. Take wheel loads from the cornering, braking and combined load cases. 2. Size the spindle shaft for fatigue at the worst case, then size up to an appropriate bearing and remove as much inner material as possible. 3. Select bearings on required bore, spacing and its effect on moment reaction, static load rating against worst-case load, dynamic load rating against average load and expected life, and then the lightest and smallest option that fits. 4. Design the upright to connect the geometry points, sizing every hole and tab. 5. Analyse. Wheel load applied as a remote load from the contact patch to the bearing faces; lower ball joint and tie rod mount bolt faces react lateral and longitudinal motion; upper ball joint reacts all translation; brake caliper bolt faces take a moment reaction for braking. Global element size 0.045 in, second-order wedge elements. 6. Cross-check with the full-corner model, then state the resulting compliance. CR26I effective angular deformation of the corner in cornering is 0.32 degrees of camber change, including spindle, bearings, upright, tie rod mount and top mount.

Manufacturing Process

Machined, then bonded or welded into the parent part.

Full Material List

440C stainless steel, heat treated.

Reoccuring issues

See the CV Insert page. Fault Vault, 2023-07-17, CR22: right halfshaft noise traced to worn and undersized stainless inserts grooved by the tripods, which drove the change to heat-treated 440C stainless.

Still to document

Nothing in CrimsonStorage covers these yet.