E-Drive / E-Axle Housing RFQ Checklist: Bearing Seats, Sealing Faces, Datum Stack, Machining, and Inspection Evidence

# E-Drive / E-Axle Housing RFQ Checklist: Bearing Seats, Sealing Faces, Datum Stack, Machining, and Inspection Evidence

Electric drivetrain housings (e-drive / e-axle) combine gearbox-style bearing-seat requirements with motor-style sealing / thermal / cleanliness requirements. The most common RFQ failure is that suppliers quote different machining + inspection plans — and those differences only surface during assembly, NVH testing, or leak testing.

This checklist helps you write a quoteable e-drive housing RFQ so suppliers are quoting the *same* machining assumptions and the same evidence package.

Useful Bohua routes:

• •Gearbox housing manufacturer
• •EV motor housing manufacturer
• •Gearbox housing OEM quote route
• •EV motor housing OEM quote route
• •Structured RFQ upload

1) Define the functional stack (what must align to what)

In the RFQ, list the functional interfaces:

• •bearing seats (which bearings, which fits)
• •seal bores / seal lands (what seal type and where)
• •gasket faces / cover faces (flatness and surface finish expectations)
• •motor-to-gearbox alignment interfaces (pilot features, dowels, bolt pattern)

If you have a critical-feature map, attach it (even a one-page marked PDF helps).

2) Datum strategy: make inspection report references explicit

Bearing-seat runout and stack alignment are meaningless without datums.

In the RFQ, specify:

• •primary/secondary/tertiary datums (or A/B/C if defined on the drawing)
• •whether CMM reports must reference those datums
• •whether any bore-to-bore coaxiality/runout relationships are critical

If you do not have a final datum scheme, require the supplier to propose one and list it as a quote assumption.

3) Machining scope: keep suppliers quoting the same work

Define:

• •which bores/faces are fully machined
• •whether bearing seats require honing/reaming
• •whether sealing faces are machined and their surface finish targets (or “supplier propose and disclose”)
• •thread / port requirements if hydraulic interfaces exist

Also state when heat treatment occurs relative to final machining for critical features (distortion risk).

4) Inspection evidence: require outputs that reduce launch risk

For e-drive housings, request evidence that matches the risk:

• •CMM report covering datums + critical bores/faces
• •bearing seat gaging plan (CMM, air gauge, roundness tester — supplier-proposed is acceptable if disclosed)
• •leak-test scope and records if the housing is pressure-tight or has oil-cavity sealing risk (medium + pressure + hold time + sampling plan)
• •cleanliness / deburr expectations (especially cross-holes and internal passages)

Avoid “we need high quality” language; ask for the records you will use for approval.

Copy-paste RFQ starter (e-drive housing)

> E-drive / e-axle housing RFQ (copy-paste)

> Files: 2D PDF rev __ ; STEP __

> Alloy + heat treat: __ (A356-T6 / other)

> Functional stack: bearing seats __ ; seal bores __ ; gasket faces __ ; alignment pilots/dowels __

> Datums: A __ ; B __ ; C __ (CMM report must reference these)

> Runout/coaxiality critical relationships: __

> Machining scope: bores/faces to be finished __ ; surface finish targets __ ; ports/threads __

> Leak-test requirement: yes/no __ (if yes: medium/pressure/hold time or supplier proposal required)

> Inspection records requested: CMM __ ; bore gage/roundness __ ; leak-test record __ ; cleanliness/deburr notes __

> Quantity + schedule: prototype __ ; annual volume __ ; timing __ ; destination + Incoterm __

Submit a structured RFQ (drawing-ready)

• •Open gearbox-housing quote route
• •Open EV-motor housing quote route
• •Upload via Request Quote