Specifications
| — | — |
| Material | Carbon steel 1010 / 1020, alloy steel 4140, stainless 304 / 316L, 17-4PH for high-strength thin sections |
| Process | Silica sol lost wax investment casting; water glass lost wax for larger cost-sensitive end bells |
| Dimensional tolerance | ISO 8062 CT5–CT6 as cast; CT4 on bearing bore, sealing face and stator pilot after machining |
| Surface finish | Ra 3.2–6.3 µm as cast; Ra 1.6 µm on bearing seat and sealing face |
| Machining | CNC turning and boring of the bearing seat and stator pilot, face milling of the mounting flange, drilling and tapping of bolt holes, resolver and cable gland ports |
| Weight range | 3 – 25 kg per piece |
| Inspection & certificates | CMM dimensional report, bore concentricity and runout check, optional leak test on sealed designs, EN 10204 3.1, PPAP Level 3 / FAIR, IMDS support, full heat-lot traceability |
Key Features
- Bearing seat and stator pilot cast with uniform wall section, then CNC bored to hold concentricity and reduce motor noise and vibration.
- Integrated cooling ribs, water jacket walls and mounting feet cast in one piece, removing welds and leak paths.
- Machined sealing face and cable gland ports that support IP-rated enclosure performance.
- Dimensional stability through heat treatment, holding bore geometry over the motor operating temperature range.
- Thin-wall capability that cuts rotating and unsprung mass on e-axle and in-wheel applications.
- Cast-in sensor bosses, earth studs, lifting lugs and breather points to reduce downstream part count.
Applications
- Traction motors in battery-electric buses, coaches and delivery vans.
- E-axle and integrated drive units on battery-electric trucks and tractor units.
- Battery-electric pickup and light commercial vehicle drive motors.
- Off-highway electrified loaders, excavators, tractors and mining service vehicles.
- Auxiliary motors for electric compressors, pumps and fans on commercial vehicles.
- Range extender, generator and industrial motor end bells for stationary and mobile power.
Quality & Compliance
Ningbo Ruican manufactures EV motor end bell housings under IATF 16949 and ISO 9001 certification, with full heat-lot traceability from melt to finished part. EN 10204 3.1 material certificates are issued with every lot and IMDS data entry is supported for OEM material compliance submissions. PPAP Level 3 documentation, including the FAIR, dimensional layout, control plan and capability study on bearing bore and pilot features, is prepared before series release. Inspection options include CMM measurement of bore concentricity, runout and flange flatness, air decay leak testing for sealed or water-jacketed designs, X-ray examination of coolant passages, and penetrant inspection on stainless grades.
FAQ
How do you control bearing bore concentricity?
The bearing seat and stator pilot are machined in a single setup on CNC equipment where possible, and concentricity and runout are verified on a CMM with results recorded in the first article and series reports.
Can you cast a water jacket into the end bell?
Yes. Coolant passages can be cast in, with controlled wall thickness and X-ray or pressure verification of the jacket before machining.
Which material is best for an EV traction motor end bell?
For most structural end bells, 1020 carbon steel or 4140 alloy steel gives the best balance of strength, machinability and cost. For corrosion-critical or uncoated exterior duty, 316L stainless is the usual choice.
Do you machine the full flange and bolt pattern?
Yes. The mounting flange face, bolt holes, dowel holes, resolver ports and cable gland threads are all machined in-house to your drawing.
Can you support prototype volumes before series tooling?
Yes. We produce prototype and pre-series parts using existing tooling or rapid tooling options, then transition to production tooling once the design is frozen.
What documentation supports a new EV programme launch?
We provide the PPAP Level 3 package, including the FAIR, control plan, process flow, PFMEA and capability study, along with EN 10204 3.1 certification and IMDS support.
Send your drawing, 3D model or sample for a fast quotation — Wendy She — sales@cnsandcasting.com — WhatsApp +86-13777124360.
