INA Drawn Cup Roller Clutch Without Bearing Arrangement represents Schaeffler Group’s focused solution for applications demanding pure mechanical overrunning functionality without integrated radial support. This cold-formed steel assembly enables fail-safe torque transmission in one direction while allowing freewheeling in the opposite direction – all within an ultra-compact envelope ideal for custom powertrain designs, starter motors, and automated machinery where space optimization is critical.
Critical Application Sectors
Automotive & E-Mobility:
Starter Motor Drives: Overrunning crankshaft engagement (HFL 1025: 180 N·m)
Hybrid Transmission ISG: Bidirectional torque management
E-Turbo Actuators: Freewheeling during exhaust pulse surges
Industrial Machinery:
Conveyor One-Way Drives: Anti-reverse safety in inclined systems
Indexing Table Rotation: Precision angular positioning
Robotics & Mechatronics:
Robotic Joint Braking: Backdrive prevention in collaborative arms
Medical Device Drives: Sterilizable sealed clutches (IPX9K)
Selection & Integration Guidelines
- System Requirements:
Torque Profile: Calculate peak/continuous torque (add 2.5× shock factor)
Engagement Cycles: ≤ 120 engagements/minute standard (upgrade springs for 300+)
Overrun Duration: Continuous vs. intermittent operation
- Shaft & Housing Specs:
Parameter Requirement Standard
Shaft Hardness ≥ 58 HRC ISO 683-17
Shaft Finish Ground Ra ≤ 0.2 μm DIN 4768
Housing Bore H7 tolerance ISO 286-2
Bore Perpendicularity ≤ 0.02 mm/100 mm DIN 876
- Lubrication Strategy:
Initial Grease: Polyurea-based EP2 grease (30–50% cup volume)
Oil Bath: ISO VG 32–68 with splash lubrication
Relubrication: Not possible in sealed units (design for L10 life)
- Mounting Protocol:
Thermal Installation: Heat housing to 80–100°C
Axial Press-Fit: Apply force only to cup rim (max 0.5% OD deformation)
Shaft Alignment: ≤ 0.3° angular offset during insertion
Pre-Operational Test: Rotate shaft through 10 engage/overrun cycles
Why INA Standalone Clutches Lead the Market
Zero Backlash Engagement: < 3° rotation loss at 100 N·m load
Space Efficiency: 8 mm width for Ø25 mm bore (HFL 1025)
IATF 16949 Compliance: Full PPAP documentation support
Digital Validation: Bearinx® simulation of 10M+ engagement cycles
Customization: 48-hour turnaround for prototype splines/coatings
Technical Innovations:
ECO Clutch: Dry-running design with solid lubricant plugs
Smart Overrun Sensor: Integrated Hall-effect ring with CAN output
Conclusion: Precision Overrunning in Its Purest Form
INA Drawn Cup Roller Clutch Without Bearing Arrangement delivers uncompromised mechanical overrunning performance where radial support is handled separately. By concentrating engineering excellence on the clutch mechanism itself, Schaeffler achieves:
