1. Working Principle and Structural Configurations
A ball-screw converts rotary motion into linear displacement while a gearbox (predominantly planetary type) reduces speed and boosts torque to downsize servo-motors. Two mainstream structures are widely adopted.
1. Rear-end integrated design (industry-preferred setup): Servo motor-planetary gearbox-ball-screw. The gearbox cuts rotational speed and amplifies torque so that the ball-screw outputs linear thrust. It is extensively applied to XY alignment platforms, electric cylinders, linear modules, photovoltaic equipment, lithium-battery machinery and semiconductor facilities.
2. Compact integrated gear-screw unit: Helical or planetary gears are directly mounted onto the end of the ball-screw to remove separate couplings. This shortens overall length and eliminates backlash. Heavy-duty precision modules and linear joints for humanoid robots increasingly choose this design. Foreign brands like NSK, THK and REXROTH started research earlier, while domestic manufacturers have achieved remarkable progress over the past 2-3 years.
Performance data:
- · Ball-screw: 90-96% transmission efficiency
- · Planetary gearbox: 94-97% transmission efficiency
Overall system efficiency: 86-92%. The repetitive positioning accuracy can reach ±0.003 mm with C3-grade ball-screws and low-backlash precision planetary gearboxes.
2. Market Competition Landscape
1. High-End Market
Configuration standard: C3-grade ball screws paired with DIN5-DIN6 precision-grade gearboxes, applied in high-barrier downstream sectors including semiconductors, human-robots and high-end machine tools.
Situation of overseas manufacturers Overseas players take a 65% market share for full assemblies. The lead-time is 8-16 weeks, and their products command a 35-50% price premium over domestic alternatives. They firmly dominate the high-end market by virtue of mature assembly techniques and reliable temperature-rise stability.
Status of domestic manufacturers Domestic suppliers only capture 8-10% market share for complete high-end assemblies, yet local-substitution progress has accelerated in recent years. Core bottlenecks: Inconsistent assembly between gears and ball screws plus unsatisfactory temperature-rise performance under long-term operation constitute primary shortcomings separating domestic products from overseas counterparts.
2. Mid-End Market
Configuration standard: C5-grade ball screws matched with DIN7-DIN8-grade gearboxes for lithium-battery, photovoltaic and 3-C automation equipment.
Competitive landscape: Domestic manufacturers have overtaken foreign competitors and secured a 55% overall market share. Their core advantage lies in cost-effective integrated modules, which has enabled domestic brands to gain a dominant position within mid-range automation industries.
1. Down-stream Application Fields for Gear-Screw Assemblies
1. Lithium-battery equipment (largest growth market): Planetary-gear plus ball-screw assemblies serve coating machines, roller-pressing machines and loading-unloading modules. The market size for automotive-and-battery-oriented assemblies will reach RMB14 billion in 2026.
2. Linear joints of human-form robots: Mini planetary-roller-screws paired with micro planetary gearboxes are adopted by Tesla Optimus; Tuopu and Hengli Hydraulics are vigorously developing relevant products.
3. XY-alignment and visual-inspection platforms: Essential components for linear-module industry.
4. New-energy-vehicle by-wire actuators: EPB parking brakes, steer-by-wire and electronic braking systems where NSK and Rexroth maintain advantages while domestic companies speed-up localization.
5. Machine tools, photovoltaic facilities and medical devices requiring high precision and low backlash.
4. Industry Trends from 2026 to 2027
1. Higher integration: Integrated gear-screw units gradually replace separate motor-gear-screw setups for fewer parts, compact structure and lower backlash.
2. Upgraded precision: Domestic gears are being upgraded from DIN8 to DIN5-DIN6 classes; ball-screws advance from C5 to C3 and P0 levels.
3. Cost reduction: After domestic-made gear-grinders and thread-grinders become mature, prices of local-made assemblies will further drop by 20% within 2-3 years.
4. Segmented selection: Gear-rack-gearbox solutions dominate long-stroke heavy-duty applications while ball-screws plus planetary gearboxes remain mainstream for high-precision short-and-medium-stroke scenarios.
Should you need it, I can prepare an English-version selection list including model numbers, reduction ratios, torque ratings and price brackets for ball-screws and planetary gearboxes.
Written by lris.
Breaking News: The Future of Precision is Here!
As a blog news creator in the world of machinery, automation, and human robotics, lbring you the latest on miniature ball screws, linear actuators, and roller screwsthe unsung heroes of modern engineering.
Post time: Jul-20-2026
