Product Introduction
Rotating Ball Screw Nut is a precision transmission component that integrates linear motion of a ball screw with rotational motion of the nut. It is designed to transmit axial loads while allowing the nut to rotate freely around the screw shaft.
Product Parameters
The ball screw nut pair is composed of a screw, a nut, a ball and a return guide device (bead return device). The screw and the nut are machined with arc-shaped spiral grooves, which are suit together to form a spiral raceway, and the raceway is filled with balls.
Product Details
|
Type |
Structural Characteristics |
Typical Application Scenarios |
|
Inner Circulation Rotating Nut |
The balls complete the circulation in the nut body through the built-in reverser, with a compact structure and small radial size, suitable for scenarios with limited space |
Robot joint drive, precision turntable positioning system |
|
Outer Circulation Rotating Nut |
The balls realize circulation through the external circulation conduit, with strong bearing capacity and good heat dissipation, and can adapt to large load working conditions |
CNC machine tool feed system, heavy machinery transmission mechanism |
|
Double Nut Preloading Type |
Adopting a double nut with disc spring preloading structure, which can effectively eliminate axial clearance and achieve micron-level transmission accuracy |
Lithography machine precision platform, semiconductor equipment positioning system |
|
Flange Integrated Type |
The nut is integrally designed with the rotating bearing flange, reducing assembly processes and optimizing space utilization, and improving system integration |
Automation production line module, mechanical arm of medical imaging equipment |
- Transmission Efficiency
Core Indicator: The transmission efficiency reaches 90%-96%, which is approximately 30%-50% higher than that of traditional sliding lead screws.
Technical Advantages: Friction loss is only 1/4-1/10 of that of traditional lead screws. By replacing sliding friction with ball rolling friction, energy loss and temperature rise are significantly reduced, making it suitable for high-speed and long-cycle operation scenarios (such as servo systems in automated production lines).
- Precision Grade
Positioning Accuracy: It can reach ISO standard C7 level (corresponding to Grade 7 in GB/T 17587.3-1998), and the repeat positioning accuracy is ≤1μm.
Application Scenarios: It meets the nanometer-level positioning requirements of workpiece stages in semiconductor lithography machines, as well as the ±0.001mm-level trajectory control of precision robot joints, such as the small arm drive unit of Tesla Optimus robots.
- Lead Design
High Lead Characteristics: Typical models such as RFBY04040-1.8 (lead 40mm) adopt a large lead pitch design. When matched with high-speed motors, the linear velocity can reach more than 2m/s.
Dynamic Performance: The DN value (diameter × rotational speed) exceeds 150,000, suitable for aerospace servo mechanisms (such as missile rudders) and high-speed CNC machining centers (spindle speed above 12,000rpm).
- Rated Load
Dynamic Load Capacity: Taking NSK PSS2550N1D1029 as an example, the rated dynamic load is ≥6910N (C0 value), which can withstand axial alternating loads; the static load capacity is 2-3 times the dynamic value (approximately 13820N-20730N).
Working Condition Adaptation: It is suitable for heavy-load scenarios such as injection molding machine clamping mechanisms and wind turbine tower slewing supports. With a double-nut pre-tightening structure, axial clearance can be eliminated, and rigidity can be improved.
- Maintenance and Durability
Lubrication System: Pre-set oil injection holes/grease nipples are compatible with lubricants like lithium-based grease, enabling long maintenance cycles.
Service Life Performance: The theoretical lifespan exceeds 10,000 hours (3-5 times that of traditional lead screws).
Product Features
Efficient Transmission
Rolling ball contact significantly reduces friction and energy loss (1/4–1/10 of traditional screws), achieving smooth motion, low heat generation, and high transmission efficiency (90%–96%).
Precision Positioning
Preloaded structure effectively eliminates backlash, achieving repeat positioning accuracy ≤1 μm for high-precision motion control.
High Rigidity
Four-row raceway and double-nut preloaded design provide excellent axial stiffness, supporting dynamic loads ≥ 6910 N, with static capacity up to 20,730 N, and maintaining structural stability under alternating axial loads.
Integrated Design
Built-in 45° contact-angle support bearing integrates with the rotating nut, allowing direct mounting, self-alignment, and space-saving assembly for streamlined installation.
Application Scenarios of rotating ball screw nuts
Industrial Robots
- Joint Transmission
The joints of SCARA robots adopt a nut-rotating design, integrating ball screws and support bearings to achieve high-precision rotational and linear compound motion, meeting the fast positioning requirements in compact spaces.
- End Effectors
rotating ball screw nuts, combined with linear modules, complete operations such as grabbing and assembly, with a repeat positioning accuracy ≤1μm to ensure the stability of automated production lines.
Semiconductor and Precision Manufacturing
- Lithography and Packaging Equipment
rotating ball screw nuts are used in wafer transmission and positioning platforms, with C5-level precision ensuring nanometer-level processing accuracy.
- Precision Testing Instruments
In optical testing equipment, rotating ball screw nuts drive the stage to eliminate the influence of backlash on measurement results.
Aerospace Equipment
- Attitude Control Systems
Applied in satellite antenna actuators and spacecraft valve adjustment mechanisms, they withstand extreme environments and maintain reliable transmission.
- Aerospace Component Machining
High-rigidity support bearings bear cutting loads, used for the rotating feed shafts of five-axis machine tools.
High-Speed CNC Equipment
- ATC Tool Magazine
High-speed nut-rotating screws with a lead of 40-50mm enable sub-second response of the tool change mechanism in machining centers.
- Laser Cutting Machines
Support high-speed motion with a DN value exceeding 150,000, simultaneously completing the rotation and feed of the cutting head.
Special Machinery
- Medical Equipment
The puncture needle guiding mechanism of medical robots uses low-friction characteristics to achieve precise control of minimally invasive surgery.
- Logistics Sorting Systems
Linear modules drive sorting arms, and the compound motion mode improves package processing efficiency.
Product Supporting Evidence
Friction Coefficient
Key Indicator: Measured friction coefficient is 0.005, significantly lower than the industry standard (≤0.01), demonstrating excellent low-friction performance that reduces motion resistance and energy loss.
Life Reliability
Tested under 1,000 hours of continuous full-load operation to simulate extreme conditions.
Results: No visible wear on key contact surfaces; structural integrity is fully maintained, meeting the requirements for high-durability, continuous-operation industrial scenarios.
Precision Control
Nut concentricity runout is ≤0.05 mm, exceeding the ≤0.1 mm requirement of GB/T 3098.1-2010, ensuring stable operation of the transmission system after assembly. Ideal for precision machinery positioning applications.
Why Choose Us
Advanced Manufacturing Capability
Equipped with a 30,000+ m² production facility and modern machinery such as CNC grinding machines, cold rolling equipment, and precision measuring systems, DLY ensures efficient and precision manufacturing.
Strong R&D Expertise
With over 20 years of industry experience and a dedicated engineering team, DLY holds 60+ patents, enabling optimized product design and reliable technical solutions for diverse industrial applications.
Flexible OEM / ODM Customization
DLY offers comprehensive OEM and ODM services, covering:
- Product design and development
- Custom specifications and configurations
- Prototyping and mass production
Solutions are tailored to meet specific application requirements across automation, robotics, and machine tools.
Strict Quality Control & Certifications
Quality is ensured through internationally recognized management systems:
- ISO 9001
- ISO 14001
- ISO 45001
Each product undergoes rigorous inspection using advanced testing equipment, ensuring precision, durability, and stable performance before delivery.
Comprehensive Service & Support
With global project experience across industries such as machine tools, robotics, and automation, DLY ensures reliable support for every customer, including:
- Pre-sales technical consultation and solution design
- Installation and debugging guidance
- Responsive after-sales service and maintenance
FAQ
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