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Jiangsu Yufeng Electric Co., Ltd. manufactures end-cover integrated housings where the drive-end and non-drive-end covers are permanently attached to the main shell, forming a single sealed unit. This construction eliminates separate cover alignment during assembly, reduces potential leakage paths, and improves overall structural rigidity. The integration process includes precision machining of bearing housing bores, seal grooves, and mounting flanges in a single fixture, ensuring concentricity between the shell and end covers. With 40 years of motor housing production and a capacity exceeding 5 million units per year, Yufeng supplies integrated housings in IEC and NEMA frame sizes, with custom cover configurations for specific bearing arrangements and sealing requirements.
End covers are welded or bolted to the shell with gasketed joints, eliminating separate cover alignment and reducing potential leakage paths in the final assembly.
Bearing bores are machined in the same setup as the shell flange, ensuring concentricity within 0.05 mm. This reduces vibration and extends bearing life.
Integral seal grooves for O-rings, V-rings, or labyrinth seals are machined directly into the cover faces. Multiple sealing options available for different environmental exposures.
Product specifications
| Frame size range | IEC 56 – 160 (NEMA 42–210 with adapter options) |
| Cover attachment | Welded, bolted, or clamped (customer specification) |
| Bearing bore diameter | 10 mm – 60 mm (custom fits available) |
| Bearing bore tolerance | ISO H7 or J7 (or customer-specified) |
| Concentricity (bore to flange) | ≤ 0.05 mm |
| Sealing options | O-ring grooves, V-ring seats, labyrinth seals |
| Ingress protection | IP54, IP55, IP65, or IP66 (dependent on sealing system) |
| Shell material | DC01, SPCC, or S235JR (1.5 – 4.0 mm thickness) |
| Surface coating | Zinc phosphate + e-coat (standard); powder coating optional |
Engineering & design advantages
- Reduced assembly complexity: Integrated end covers eliminate separate alignment and fastening steps during motor assembly, reducing production time.
- Improved sealing integrity: Single-unit construction minimises joint interfaces, reducing potential leak paths for lubricants and contaminants.
- Enhanced structural rigidity: The integrated design increases the overall stiffness of the housing, reducing vibration transmission to the bearing system.
- Custom bearing arrangements: Bearing fits and preload settings can be tailored to specific motor speed and load requirements.
Quality assurance & supply chain
- First-pass yield > 98 % on bearing bore dimensions and concentricity (Cpk ≥ 1.67).
- Bearing bore roundness and surface finish inspected per ISO 1101.
- Material certificates EN 10204 3.1 and dimensional inspection report per batch.
- Lead time: 16–20 working days for standard configurations; 25–32 days for custom cover designs or special sealing arrangements.
- PPAP level 3 available for automotive and high-reliability applications.
Application fields
- Industrial motors: Pumps, compressors, fans, and gearmotors — where bearing alignment and sealing integrity are critical for long-term reliability.
- Automotive and EV: Traction motors, auxiliary drives, and cooling system motors — requiring compact, sealed housings for under-hood environments.
- Food and beverage: Washdown-duty motors with IP66 ratings and corrosion-resistant coatings for sanitary processing areas.
- Off-highway equipment: Agricultural and construction machinery motors exposed to dust, moisture, and vibration.
For custom end-cover configurations, Yufeng provides bearing fit analysis, sealing system recommendations, and full dimensional verification prior to production.
Engineering supportFrequently asked questions
Integrated end covers eliminate the need for separate alignment during motor assembly, reducing production time and potential assembly errors. They also provide improved sealing integrity by reducing the number of joint interfaces that can leak.
Yes. We can machine bearing bores from 10 mm to 60 mm in diameter, with custom fits (H7, J7, or customer-specified tolerances). We also support special bearing arrangements such as double-row or angular contact configurations.
We offer O-ring grooves, V-ring seats, labyrinth seals, and lip seal housings. Sealing systems can be combined to achieve ingress protection ratings from IP54 to IP66, depending on the application environment.
All critical surfaces — bearing bores, seal grooves, and mounting flanges — are machined in a single fixture setup. This ensures concentricity within 0.05 mm and minimises runout that could affect motor performance.
We provide bore diameter measurements, roundness profiles, surface finish reports, and concentricity data per batch. For special requirements, we can supply CMM reports with full dimensional verification.
Manufacturing Solutions
We offer full-process manufacturing capabilities from steel processing to finished product delivery, supported by stamping lines, automated welding equipment, machining facilities, and inspection instruments. Backed by an engineering team with an average of over 20 years of experience, we provide technical support from development to mass production.
With 40 years of focus on motor housing manufacturing, we have served more than 50 customers and achieved an annual production capacity of over 5 million units. Guided by quality, efficiency, and fast response, we are committed to delivering high-precision and high-reliability motor housing solutions.
