VSU200944 Slewing Bearings

VSU200944 Slewing Bearings — Gearless Four-Point Contact Ball Slewing Ring

The VSU200944 Slewing Bearings is a gearless, single-row, four-point contact ball slewing ring from the INA VSU Standard 20 series. With a 944 mm raceway diameter, 872 mm bore, 56 mm section height, and a static axial load capacity of 1,520 kN, it is widely used in mid-size wind turbine yaw systems, tower cranes, and large rotary equipment. Manufactured at Luoyang Heng Guan Bearing Technology Co., Ltd., each unit is produced under ISO 9001-certified quality management and available for direct export worldwide.

Full Technical Specifications

Why the Four-Point Contact Ball Design Matters?

The VSU200944 Slewing Bearings is a four point contact ball, single row design. One row of GCr15 balls may concurrently bear axial forces, radial forces and tilting moment loads, without the need for additional roller rows. This preserves the overall section depth at 56 mm but gives a C0a of 1,520 kN.

The rings are produced from quenched and tempered 50Mn or 42CrMo4 steel and the raceways are induction hardened to 55–62 HRC for surface wear resistance. The shock loads are taken by the ductile core. Continuous service Double-lip NBR seals prevent grease ingress and pollutant ingress.

The ring has no gears, therefore the means of drive is dictated by the customer’s own design – an external pinion on a customer-machined OD, a chain or belt drive, a friction wheel, or a hydraulic or electric motor via a gearbox. The lack of gear machining on the ring makes replacement easier and easier to purchase.

Application Areas

The main use is yaw systems in wind turbines. The 872 mm bore also allows cabling at the top of the tower and the gearless design is well-suited to external pinion drives, which are often used in nacelle yaw assemblies. INA VSU200944 standard is a direct replacement for VSU200944 for mid-size turbines.

The 844 mm class is at the load limit and the 944 mm raceway is used for the tower cranes and mobile cranes. The 44-bolt design allows up to 181,700 N radial load on the attaching screws, providing a tolerance for the most demanding lift cycles in the Series 20 gearless series.

The double-lip NBR seals keep debris out of the raceway and are ideal for continuous swing cycles with large excavators and material handlers. The four-point contact ball construction takes care of tilt moments during swing and load shock circumstances.

gearless configuration for tilt-moment capacity with the 944 mm raceway in utility size solar trackers. Controlled radial clearance (standard 0-0.3 mm) is required for radar and antenna platforms, for reliable, repeatable aiming. Typical uses include rotary indexing tables and maritime deck cranes, where a chain or friction-wheel drive is preferable over gear-tooth engagement.

Materials and Quality Control

All Heng Guan manufactured VSU200944 comparable bearing undergo multi-stage inspection before shipping:

• Coordinate measuring equipment are used to evaluate the dimensional precision of the raceway and bolt circle.

• Low-noise spinning confirmed by vibration testing.

· Load and seal integrity testing verifies performance to prescribed ratings.

Raw Materials have complete traceability from arriving inspection to final goods. The facility is ISO 9001 certified and all goods are RoHS compliant. Available precision grades are P0, P6, P5. Reduced-clearance and ZT centring variations may be proposed for certain application needs.

The production equipment comprises CNC vertical lathes, CNC quenching machines, CNC gear shapers, machining centers, grinding machines, and big gear hobbing machines, which can undertake both standard series production and non-standard special parts such huge ring gears, Shafts, and couplings.

Purchasing and Supply Information

· MOQ: 1 unit – no minimum batch.

· Shipping lead time: Standard models sent in 5-7 business days; bespoke configurations verified within 24 hours of engineering request.

· OEM/ODM: Supported – we can provide installation instructions, product mapping from historic references and non-standard customisation. 2D drawings available on request.

· Export reach: Factory straight to clients in 50+ countries including the United States, Germany, United Kingdom, Norway, Australia and the Middle East.

FAQ

Q: What is VSU200944?

A: It is a gearless, single-row, four-point contact ball slewing ring from the INA VSU Standard 20 series. Raceway diameter is 944 mm, bore is 872 mm, height is 56 mm, and weight is 67 kg.

Q: What is the difference between VSU200944 and VSU200844?

A: Both share a 56 mm section height. The VSU200944 has a 944 mm raceway and a C0a of 1,520 kN at 67 kg; the VSU200844 uses an 844 mm raceway with a C0a of 1,360 kN at 60 kg — approximately a 12% difference in static axial capacity.

Q: How is a gearless slewing ring driven?

A: With no gear teeth on the ring, rotation is transmitted via an external pinion on a customer-machined surface, a chain or belt drive, a friction wheel, or a hydraulic or electric motor connected through a gearbox.

Q: Can VSU200944 operate in sub-zero conditions?

A: The standard operating temperature range is -25 to +80 °C. For applications at the lower end of this range, confirm grease specification and material grade at time of order.

Q: What bolt grade is required for mounting?

A: High-strength bolts of grade 10.9 or 12.9 (ISO) are required. The 44-hole pattern on 990 mm (outer) and 898 mm (inner) bolt circles must be torqued to the design specification. Unthreaded bolt shanks should be used in the shear plane.

Q: How do I know when the bearing needs replacement?

A: Monitor axial rocking clearance under load over time. A significant increase in measured clearance relative to the initial installation value is a reliable indicator that the bearing is approaching end-of-life. Consult your application engineer for replacement criteria specific to your load cycle.

Contact Us

For quotes or technical inquiries about VSU200944 Slewing Bearings, contact Heng Guan directly at mia@hgb-bearing.com. We typically respond within one business day.