1. Industry Background & Engineering Challenges

With the electrification, intelligence, and steer-by-wire evolution of automotive steering systems, steering systems are transforming from traditional mechanical-hydraulic structures into highly integrated “electronic control – motor – actuator – sensor” coupled systems. Advanced technologies including column-type/rack-type electric power steering (CEPS/R-EPS), steer-by-wire (SBW), and rear-wheel steering (RWS) have become core chassis components for new energy vehicles and L2+ autonomous driving. However, the significant increase in system complexity has brought new validation and engineering challenges:

• Flexible production and rapid changeover under the coexistence of high-mix, low-volume, and high-cycle time requirements
• Zero-defect assurance under high-precision assembly and comprehensive functional testing
• Reliability and sealing testing of electronic redundancy, sensor integration, and electrical connections under complex operating conditions
• Online calibration, data traceability, and intelligent defect diagnosis capabilities that match the rapid iteration pace of complete vehicles
• Insufficient rapid iteration and regression testing capabilities

For OEMs and Tier 1 suppliers, the core issue is no longer “whether production is possible,” but rather: Can we achieve large-scale assembly and testing of advanced steering systems efficiently, accurately, and reproducibly in the early stages of mass production, ensuring safe, reliable, and consistent delivery to the market?

2. KTS System-Level Approach

From the perspective of the full lifecycle mass production of automotive steering systems, KTS deeply analyzes the process commonalities and differences among diverse products such as CEPS, P/DP-EPS, REPS, X-EPS, manual steering gears, steer-by-wire, and rear-wheel steering. We have built a solution system for intelligent steering system production lines covering component-level assembly, subsystem-level testing, system-level performance validation, and end-to-end data management.

This system is not a single piece of equipment or isolated workstation, but consists of the following three core capabilities, forming a modular, scalable, and highly flexible overall architecture:

Flexible platform design and high-mix rapid changeover capability

High-precision assembly execution and comprehensive intelligent testing capability

Digital twin modeling and full-process data capability

Through the deep integration of the above three capabilities, KTS solutions ensure that steering system assembly and testing are not only “producible and inspectable,” but also efficient, reliable, traceable, and optimizable. This helps OEMs and Tier 1 suppliers achieve safe, large-scale mass production of advanced steering technologies quickly amidst the wave of electrification and intelligent transformation, firmly grasping competitive advantages in the market.

3. Core Capability Modules

Steering System Component Assembly & Testing

• Main shaft press-fitting & mechanical centering testing
• Bearing inner ring press-fitting and adjusting screw assembly
• Worm shaft assembly
• Rack lubrication and coupling assembly
• Upper cover assembly press-fitting machine

Applicable for:

• Various EPS assemblies (e.g., CEPS, P/DP-EPS, REPS) and key components
• Steer-by-wire systems (SBW)
• Rear-wheel steering systems (RWS)

 Steering System Performance Testing

 No-load rotational torque testing

• Input/output torque characteristic testing
• Motor current characteristic testing
• Break-in testing
• Comprehensive NVH testing
• Sensor calibration and welding

Leak testing

Applicable for:

• Various EPS assemblies (CEPS, P/DP-EPS, REPS, X-EPS) and key components
• Steer-by-wire systems (SBW)
• Rear-wheel steering systems (RWS)

TD Series Centering Machine

 Internal leakage testing

• Torsion bar centering
• Drilling / 4. Pin pressing
• Pin pressing force testing
• Re-inspection

Applicable for:

• Centering, drilling, pin pressing, and re-inspection of various hydraulic power steering control valves
• Centering, drilling, pin pressing, and re-inspection of various electric power steering control valves

4. Key Technical Advantages

High-Dynamic Servo Press System

Self-developed servo press controller integrates press-fitting process with dynamic performance validation

Supports multi-mode based on force and displacement

Core Concept of Modular Flexible Design Across the Entire Production Line

• Wide-range product compatibility and high-adaptability engineering design. Tooling and fixtures adopt standardized design. When adding new products, only dedicated modules need replacement, without overall production line modification.
• Full-process integrated layout. Flexible configuration of single-station or multi-station production line solutions based on customer capacity requirements, adapting to different scales of production scenarios.
• Redundant design with three-level protection for key component structures.

Full Lifecycle Test Validation and Shared Service Support

• C++/QT architecture supports rapid test model construction, real-time curve analysis, and multi-hardware environment adaptation, perfectly matching production line high-speed acquisition and motion control requirements.
• Through KEYTOO shared laboratory services, provides professional performance, durability, environmental, and reliability testing capabilities, seamlessly integrating with intelligent equipment production lines to achieve full-process data exchange and process optimization from “R&D – trial production – mass production.”
• Supports complex specialized testing, providing rapid insights and third-party validation for customer new product iteration or mature product upgrades.
• Helps OEMs and Tier 1 suppliers identify potential risks in early development stages, ensuring steering system safety compliance and rapid market launch.

End-to-End Production Line Data Traceability and Management

Self-developed MES system enables full-process digital management of production planning, process control, quality traceability, workshop inventory, and project dashboards for automotive components.

Builds production line digital twins, realizing real-time mapping of equipment – workpiece – process parameters, intelligent anomaly diagnosis, and process self-optimization, supporting multi-factory collaboration and continuous improvement.

Custom-Oriented System Integration Capability

Provides end-to-end customized solutions from single equipment to complete production lines, and from offline testing to cloud-based data services, based on the customer’s specific steering system, product series, and development stage.

Supports deep integration with customer’s existing software platforms, control systems, and MES, ensuring rapid project implementation and long-term scalability.

Builds hard-to-replicate competitive barriers for customers, enabling efficient mass production under the transformation to electrification and intelligence.

5. Typical Application Scenarios

• OEM steering system R&D and validation
• Tier 1 steering system R&D and validation
• Early-stage testing and trial production for new product development
• Steering component machining and assembly
• Rapid regression validation after design changes

6. Implementation & Delivery

KTS provides complete engineering services from requirements analysis to system delivery:

• Test requirements and condition analysis
• Production line solution design and simulation validation
• Equipment manufacturing and system integration
• On-site installation, commissioning, and training
• Long-term technical support and system upgrades

7. Selected Case Studies

KTS has successfully delivered multiple intelligent assembly and testing production lines for automotive steering systems, covering the full range of traditional manual steering, electric power steering, steer-by-wire, and rear-wheel steering, serving numerous well-known domestic and international OEMs and Tier 1 suppliers. In areas such as assembly precision, functional consistency, comprehensive testing, and data traceability, we have significantly improved customer mass production efficiency, product quality, and process optimization capabilities, helping customers achieve zero-defect large-scale production and rapid response to market iteration demands.

Manual Steering Gear (MSG) Assembly & Testing Line Case

The MSG assembly and testing line is mainly used for the assembly and testing of various components of manual rack-and-pinion steering gears. Key press-fitting equipment on the production line features leak-proof, error-proof, in-position testing, and process monitoring functions. The production line adopts a flexible cell structure, with预留 fixture space at each station to facilitate product changeover and expansion. Workpiece transfer between stations is manual. The entire line integrates a digital management system, equipped with MES and intelligent anomaly diagnosis. Production cycle time: <100 seconds. Line equipment includes:

• Pinion bearing press-riveting machine
• Rack, pinion shaft, and bearing plug assembly machine
• Rack pressure piece assembly machine
• Gap and rack force testing machine
• Total turns and no-load torque testing machine
• Dust cover, clamp, and inner/outer tie rod machine

CEPS Assembly & Testing Line Case

This assembly and testing line is suitable for the assembly and testing of column-type electric power steering (CEPS) product components. Key press-fitting equipment on the production line features leak-proof, error-proof, in-position testing, and process monitoring functions. The production line adopts a flexible cell structure, using MES and barcode management (housing, column, motor, ECU each with QR codes). Key assembly and testing data can be stored and traced. Production cycle time: <45 seconds. Line equipment includes:

• Marking machine
• Bearing press-fitting machine
• Centering and pin pressing machine
• Sensor welding and calibration machine
• Lubrication machine
• Gap testing machine
• Break-in machine
• NVH testing machine
• Performance testing machine
• Final assembly inspection machine

R-EPS Assembly & Testing Line Case

The R-EPS assembly and testing line is mainly used for the assembly and testing of various components of belt-driven electric power steering gears. Key press-fitting equipment on the production line features leak-proof, error-proof, in-position testing, and process monitoring functions. The production line adopts a flexible cell structure. Reserved fixture space at each station facilitates product changeover and expansion. The entire line integrates a digital management system, with data uploaded to MES for traceability. Production cycle time: <60 seconds. Line equipment includes:

• Bearing press-fitting machine
• Centering and pin pressing machine
• Sensor welding and calibration machine
• Lubrication machine
• Synchronous belt assembly and tension testing machine
• Gap testing machine
• Leak testing machine
• Break-in machine
• NVH testing machine
• Performance testing machine
• Ball joint tie rod automatic machine
• Final assembly inspection machine

X-EPS Assembly & Testing Line Case

The X-EPS assembly and testing line is mainly used for the assembly and testing of various components of recirculating ball type electric power steering gears. Key press-fitting equipment on the production line features leak-proof, error-proof, in-position testing, and process monitoring functions. The production line adopts a flexible cell structure, with预留 fixture space at each station to facilitate product changeover and expansion. The entire line integrates a digital management system, with data uploaded to MES for traceability. Production cycle time: ≤120 seconds.

• Torsion bar and bearing press-fitting machine
• Bearing inner ring press-fitting and adjusting screw assembly machine
• Rocker shaft assembly, press-riveting, and side cover bearing press-fitting machine
• Middle housing assembly machine
• Upper cover assembly press-fitting machine
• Housing assembly press-fitting machine
• Adjusting screw machine
• Rocker shaft assembly side cover machine
• Leak testing machine
• Worm wheel press-fitting machine
• Sensor welding machine
• Sensor calibration machine
• Middle housing assembly and worm wheel lubrication machine
• Upper cover assembly, motor, and controller assembly machine
• Break-in machine
• Forward/reverse friction testing machine
• Electrical performance testing machine
• Gap testing machine
• Noise testing machine
• Rocker arm assembly machine
• End-of-line inspection

Steer-by-Wire (SBW) Assembly & Testing Line Case

The SBW assembly and testing line is mainly used for the assembly and testing of various components of electric power steer-by-wire steering gears. Key press-fitting equipment on the production line features leak-proof, error-proof, in-position testing, and process monitoring functions. The production line adopts a flexible cell structure, with manual workpiece transfer between stations. The entire line integrates a digital management system, with data uploaded to MES for traceability. Production cycle time: ≤90 seconds.

• Bearing press-fitting machine
• Sensor welding and calibration machine
• Lubrication machine
• Synchronous belt assembly and tension testing machine
• Gap testing machine
• Leak testing machine
• Break-in machine
• NVH testing machine
• Performance testing machine
• Ball joint tie rod automatic machine
• Final assembly inspection machine

Rear-Wheel Steering (RWS) Assembly & Testing Line Case

The RWS assembly and testing line is mainly used for the assembly and testing of various components of electric power rear-wheel steering gears. Key press-fitting equipment on the production line features leak-proof, error-proof, in-position testing, and process monitoring functions. The production line adopts a flexible cell structure, with manual workpiece transfer between stations. The entire line integrates a digital management system, with data uploaded to MES for traceability. Production cycle time: ≤90 seconds.

• Bearing press-fitting machine
• Sensor welding and calibration machine
• Lubrication machine
• Synchronous belt assembly and tension testing machine
• Gap testing machine
• Leak testing machine
• Break-in machine
• NVH testing machine
• Performance testing machine
• Ball joint tie rod automatic machine
• Final assembly inspection machine

8. Contact & Customized Solution

• If you are planning, upgrading, or optimizing your automotive steering system production line, please contact our intelligent manufacturing engineering team. We will provide you with professional overall solutions and technical support:
• Targeted production line planning, including layout analysis, cycle time analysis, and bottleneck diagnosis
• Assembly and testing solution recommendations tailored to your specific steering system architecture
• Highly customized production line design and digital twin simulation
• Engineering-level technical communication and support

Get a Technical Solution

Please scan the QR code below or leave a message on our official website. We will arrange for a senior engineer to contact you promptly, providing detailed technical white papers, successful case studies, and preliminary solution evaluations.

Contact KTS Engineer

Phone: 18963018172
Email: zhou.zhang@cnkts.cn
Website: www.cnkts.cn

KTS looks forward to working with you to jointly promote the automotive steering system toward a safer, smarter, and more efficient future.