Drivetrain Assembly

Subteam: EV Power SystemsSubsystem: Tractive SystemAssembly: Drivetrain AssemblyCars: CR26E

Purpose

Assembly line covering the complete drivetrain.

Function

Groups the sprockets, chain, chain guard, differential, carriers, driveshafts, tripods and inserts. Design Philosophies and Processes: Inherited from the Accumulator LV subsystem design process: 1. List every low voltage function inside the container and what it must interface with. 2. Decide grounding architecture (star chosen) and lay out the returns. 3. Design the boards, with conformal coating selected against the requirement (acrylic is easier to rework, silicone is more vibration resistant and more temperature tolerant but costs more and is harder to remove). 4. Design HV monitoring: optocoupler (smaller, cheaper, digital, needs conformal coating) against voltage transducer (no conformal coating needed, larger, more expensive, analog). 5. Build the sub-harnesses, test in simulated conditions before the pack is live.

Reoccuring issues

None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.

Properties

Weighed mass: 3143.4 g (6.930 lb) (recorded as: Drivetrain). Source: Subteam weight books: CR25/Initial Documents/Weight Breakdown CR25.xlsx

Still to document

Nothing in CrimsonStorage covers these yet.

Design Process — How it is designed and deemed effective at its purpose and function
Design Constraints — What held back the design whether it be location, time, materials etc
Analysis — How you get quantitative, predictive information on the part
Manufacturing Process — How it is assembled in detail from start to finish
Full Material List — Everything used to build this part (Best if actual numbers are used to show how it evolves year to year)
Improvements — Improvements for this generation