July 21,2026
Vitesco EMR4 electric drive system represents a highly integrated electric drivetrain platform designed for modern electric vehicle application.
For this application, the bearing system needed to achieve reliable performance under demanding EV operating condition, including high rotational speed, continuous operation, low noise requirement, and compact installation space.
MTWB developed a customized EV motor bearing solution based on 6006 and 6206 deep groove ball bearings, optimizing bearing design parameter including cage structure, internal clearance, lubrication performance, and precision control.
This case demonstrates MTWB capability to support electric vehicle application through customized bearing engineering, from application analysis and bearing selection to production support.
| Item | Details |
Customer Application | Vitesco EMR4 Electric Drive System |
Industry | Electric Vehicle Powertrain |
Bearing Type | 6006 & 6206 Deep Groove Ball Bearings |
Maximum Operating Speed | 16,000 RPM |
Application Requirement | High-speed rotation, low NVH, thermal stability |
MTWB Solution | Customized EV motor bearing configuration |
Applied to 20+ vehicle models ，The MR4 is highly integrated, modular and scalable, with a power range covering 80 kilowatts to 230 kilowatts. At the same power level, the fourth-generation electric shaft drive system has reduced by 25% compared to the previous generation. Has been used in the PSA electric vehicle project.
Product design feature, max. operating speed
• OEM： Vitesco
• Application：Electric Drive System
• Max.Speed：16000 RPM
Special channel curvature design enhances rotational accuracy.
1. PA46 high-performance polyamide cage: High rigidity & high heat resistance (<250℃):
2. Reduces deformation of the cage during high-speed rotation.
3. Torque resistance is reduced by 50%.
4. Extremely high wear resistance hence longer life span.
5. Lighter weight, lower noise (V4 group or above).
• Internal size adjustment improves lubrication efficiency and rotational accuracy.
• Selects high-temperature resistant, high-speed silent grease.
• Selects high-grade bearing steel from Jiangyin Xingcheng Special Steel
The EMR4 electric drive system is a modular and scalable electric drivetrain platform with a power range covering 80 kW to 230 kW.
Key application characteristic include:
High-speed electric motor operation
Compact drivetrain integration
Continuous operating condition
Increased requirement for efficiency and reliability
Compared with conventional industrial motors, EV drivetrain systems place additional requirement on EV motor bearing.
The bearing solution must maintain stable operation while managing:
High rotational speed
Frequent acceleration and deceleration
Temperature variation
Low vibration and noise requirement
Long service life expectation
During the development of the EMR4 electric drive system, the bearing assembly faced several engineering requirement beyond standard industrial bearing application.
The electric drive system required reliable bearing performance at speeds up to 16,000 RPM.
At high rotational speed, bearing performance is affected by:
Increased friction
Cage stress
Lubrication behavior
Rotational accuracy
The bearing configuration required optimized internal design to maintain stable operation under continuous high-speed condition.
For high-speed EV application, cage design directly influences bearing reliability.
The application required a cage structure with:
High rigidity
Improved heat resistance
Wear resistance
Stable guidance performance
A suitable cage design helps reduce instability during high-speed rotation.
Electric drive systems operate under changing thermal condition.
The bearing lubrication system needed to provide:
Low friction operation
Stable lubrication performance
Long-term reliability
The grease selection and bearing configuration were optimized according to EV operating requirement.
Noise, vibration, and harshness (NVH) performance is a critical consideration in electric vehicle.
Because EV motor operate with lower background noise compared with combustion engine, bearing-related vibration and noise become more noticeable.
The bearing solution required:
Precision manufacturing control
Smooth rotational performance
Reduced vibration characteristic
Based on the EMR4 application requirement, MTWB optimized the EV motor bearing configuration through targeted engineering improvement.
| Component | Optimization |
Cage Design | PA46 high-performance polyamide cage for improved high-speed stability |
Internal Clearance | Adjusted clearance to improve rotational accuracy and operating stability |
Lubrication | Low-torque high-speed grease selection for EV operating conditions |
Precision Control | P5/P6 precision grade options according to application requirement |
The customized PA46 polyamide cage was selected to improve bearing performance under high-speed operating condition.
Key advantages include:
Higher cage rigidity
Improved heat resistance
Reduced deformation during rotation
Better wear resistance
Improved high-speed stability
This design supports reliable operation of high-speed EV bearing in electric drivetrain application.
Bearing internal geometry plays an important role in EV motor performance.
MTWB optimized:
Internal clearance
Raceway geometry
Rotational accuracy
Lubrication compatibility
These improvements help achieve:
Stable rotation
Controlled friction
Improved operating reliability
Better adaptation to electric drive condition
For applications requiring advanced accuracy and customized configuration, MTWB provides high precision bearings for demanding rotating equipment.
MTWB selected 6006 and 6206 deep groove ball bearings for this electric drive application because these bearing types provide:
Compact structure
Reliable radial load capacity
Stable rotational performance
Suitability for high-speed electric motor applications
For customers requiring application-specific performance, MTWB supports customized deep groove ball bearings with adjustments including precision grade, cage material, sealing structure, internal clearance, and lubrication selection.
| Item | Specification |
Bearing Type | Deep Groove Ball Bearing |
Bearing Number | 6006 |
Bore Diameter (d) | 30 mm |
Outer Diameter (D) | 55 mm |
Width (B) | 13 mm |
Material | Chrome Steel / Customized |
Precision Grade | P6 / P5 Optional |
Cage Type | Steel Cage / Nylon Cage Optional |
Seal Type | Open / ZZ / 2RS |
Dynamic Load Rating (Cr) | 13.2 kN |
Static Load Rating (Cor) | 8.3 kN |
Application | EV Motor, Electric Drive System, Industrial Motor |
| Item | Specification |
Bearing Type | Deep Groove Ball Bearing |
Bearing Number | 6206 |
Bore Diameter (d) | 30 mm |
Outer Diameter (D) | 62 mm |
Width (B) | 16 mm |
Material | Chrome Steel / Customized |
Precision Grade | P6 / P5 Optional |
Cage Type | Steel Cage / Nylon Cage |
Seal Type | Open / ZZ / 2RS |
Dynamic Load Rating (Cr) | 19.5 kN |
Static Load Rating (Cor) | 11.3 kN |
Application | EV Drive Motor, Gearbox, Electric Vehicle System |
Modern electric vehicle platform, especially high-voltage architecture, may experience shaft current issue that can affect bearing service life.
Electrical current passing through bearings may cause:
Raceway damage
Electrical pitting
Bearing fluting
Premature failure
For applications requiring additional protection, MTWB provides optional electrical insulation bearing solution, including:
Hybrid ceramic bearings with Si₃N₄ ceramic rolling element
Ceramic-coated bearing component
Electrically insulated bearing design
These solutions help reduce risks associated with shaft current and electrical erosion in advanced EV drivetrain system.
Through customized bearing design and engineering optimization, MTWB provided an OEM-compatible EV motor bearing solution for the EMR4 electric drive application.
The project outcome included:
Successfully validated for high-speed electric drive operation
Improved rotational stability under continuous operating conditions
Supported low-noise drivetrain requirement
Provided a customized bearing configuration based on EV application requirement
This application demonstrates MTWB ability to support electric vehicle manufacturers and drivetrain supplier with customized bearing engineering solution.
Developing reliable EV motor bearing requires more than selecting standard bearing dimension.
The bearing solution must consider:
Motor operating speed
NVH requirement
Lubrication condition
Thermal environment
Electrical protection requirement
OEM integration requirement
MTWB supports customers through:
Bearing application analysis
Bearing selection support
Customized bearing design
Prototype evaluation
Precision manufacturing
OEM production support
This Vitesco EMR4 application demonstrates MTWB capability to support EV manufacturers from initial bearing evaluation through customized production.
An EV motor bearing is a precision bearing designed for electric vehicle motor and drivetrain system. Compared with conventional bearing, EV motor bearing require higher speed capability, lower friction, lower noise, and improved durability.
The 6006 and 6206 bearings provide a compact structure, reliable load capacity, and stable rotational performance, making them suitable for electric motor and drivetrain application.
Yes. MTWB provides customized EV motor bearing solution including cage design, internal clearance adjustment, lubrication optimization, sealing structure, precision grade, and OEM specification.
For high-voltage EV application, MTWB can provide hybrid ceramic bearing and electrically insulated bearing solutions to reduce risks caused by shaft current and electrical erosion.
Developing a high-speed electric drive system requires bearing that deliver stable performance under demanding operating condition.
MTWB provides customized EV motor bearing, including high-speed drivetrain bearing, OEM replacement bearing, and application-specific bearing design.
Contact MTWB for:
Bearing selection support
Technical specifications
Customized solutions
Sample evaluation
and discuss your next electric vehicle bearing application.
MTWB (Mighty Way Industrial Limited) is a customized bearing manufacturer specializing in high precision bearings and application-specific bearing solution.
With advanced manufacturing capability, quality control system, and engineering expertise, MTWB supports global customers developing reliable bearing solution for demanding application including electric vehicle, industrial equipment, and high-speed rotating system.
