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
RFQ CTA
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Send the drawing, target alloy, finishing scope, MOQ, and delivery timing. Bohua will review it like a real sourcing project, not a generic contact request.
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)
Project CTA
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