VSU200644 Slewing Bearings

VSU200644 Slewing Bearings — INA VSU Standard 20 Series Four-Point Contact Ball Slewing Ring

VSU200644 Slewing Bearings belong to the INA VSU Standard 20 series — a gearless, single-row four-point contact ball slewing ring with a 644 mm raceway diameter, 716 mm outside diameter, 572 mm bore, and 56 mm height, weighing 44.41 kg. Rated at 1,040 kN static axial load and 162 kN dynamic axial load, this bearing is used in utility-scale solar trackers, crane slewing sections, and a range of industrial rotation applications. Luoyang Heng Guan Bearing Technology Co., Ltd. manufactures and supplies this model from Luoyang, China.

What Is the VSU200644 Slewing Ring?

The VSU200644 Slewing Bearings is part of the series VSU Standard 20 by INA VSU, a gearless four-point contact ball slewing ring for situations where a single bearing row has to sustain axial, radial and tilting moment loads concurrently.

The four-point contact ball shape provides four raceway contact points per ball, thus one compact row can manage combined axial, radial and moment stresses without raising the section height. This is much more efficient structurally than stacking separate bearing rows for each load direction.

The outer ring without gear teeth allows for flexible drive design. Typical possibilities include:

· External pinion on customer supplied gear ring

· Drive belt or chain

· Wheel friction

· Turntable frame mounted hydraulic or electric motor

This makes the VSU200644 well suited for solar tracker pivot systems, where linear actuators or external pinion drives are common.

Ring material: 50Mn or 42CrMo4 steel. Raceways induction hardened to 55-62 HRC for wear resistance, but core toughness is retained for shock absorption. The rolling elements are balls of GCr15 bearing steel . Double-lip NBR seals hold grease and prevent contamination.

VSU200644 Full Technical Specifications

Dimensional and load data referenced from Schaeffler medias product catalogue (VSU200644 entry).

Compared with the VSU200544 (C0a 870 kN, raceway 544 mm, OD 616 mm, 37.4 kg), the VSU200644 raises static axial capacity to 1,040 kN at the same 56 mm section height, which can be relevant when the smaller raceway band is load-limited and the mounting structure cannot accommodate a taller cross-section.

Application Areas

Solar Trackers

Primary use cases include utility-scale PV farm trackers, single-axis and dual-axis. The 544 mm band has a lower tilt-moment capability than the 644 mm raceway. With a working range of -25 to +80 °C and sealed design, it is suitable for outdoor conditions, including desert, coastal and high-altitude locations.

Crane and Lifting Platforms

Tower crane and mobile crane slewing sections that have surpassed the load limit of the 544 mm raceway band may upgrade to the 644 mm racetrack. The C0a of 1,040 kN allows a larger static safety margin for greater hook loads.

Construction Equipment & Excavators

The four point contact ball design distributes stress loads from the swing cycles into the raceway. Double-lip NBR seals prevent dirt and moisture, which are frequent on construction sites.

Turntables and Rotary Indexing Tables

Turntables with chain or friction-wheel drives may utilise the 36-hole bolt design which is compatible with common turntable mounting configurations.

Yaw Systems for Wind Turbines

For mid scale turbine yaw situations where integrated gear machining is not required, the gearless arrangement with external pinion drives is used.

Radar & Antenna Platforms

The 644 mm raceway is available in precision class P5 or P6 for applications where reliable, regulated clearance rotation over the 544 mm band is required.

Manufacturing and Supply Details

Luoyang, Henan Province, a recognised hub of bearing manufacturing in China, is where Heng Guan Bearing produces slewing bearings. The manufacturing line comprises CNC vertical lathes, CNC quenching machines, CNC gear shapers, machining centers, grinding machines and gear hobbing machines. The precision grades include P0, P6, P5 and P4 for slewing bearing sizes from 50 mm up to 10.000 mm.

The products are produced according to DIN, ISO and GB standards. The firm is ISO 9001 certified and delivers to clients in the U.S., Germany, UK, Italy, Turkey, Australia, Norway, Malaysia, Mexico, South Africa and other markets.

As for the VSU200644 in particular:

· MOQ: 1 pc — typical stock units available for single piece orders

· Precision class choices – P0, P6 and P5; Reduced clearance and preloaded variations available on request

· OEM replacement supply — VSU200644 is the original INA part number; Heng Guan provides to the same mounting quality as an independent company

• Stock availability – please Contact Us for lead times and inventories at this time

FAQ

Q: What is VSU200644?

A: It is a gearless four-point contact ball slewing bearing of INA VSU Standard 20 series. Raceway diameter 644 mm Bore 572 mm Outside diameter 716 mm Height 56 mm Weight 44.41 kg.

Q: How does VSU200644 differ from VSU200544?

A: Both have the same section height of 56 mm. The VSU200644 has a 644 mm racetrack (716 mm OD, 44.41 kg, C0a 1,040 kN) while the VSU200544 has a 544 mm racecourse (616 mm OD, 37.4 kg, C0a 870 kN). The increase in static axial capacity may be relevant when the smaller model is restricted by load and the structural envelope cannot be modified.

Q: What kind of drive is the gearless VSU200644?

A: The turntable construction is rotated by an external pinion, chain or belt drive, a friction wheel or a hydraulic or electric motor linked to the turntable frame since there are no integrated gear teeth.

Q: Is this an OEM replacement for INA VSU200644?

A: The INA original reference number is VSU200644. Heng Guan delivers bearings to the same mounting dimensions as an independent manufacturer. This makes the bearings dimensionally interchangeable as a replacement.

Q: What kind of accuracy and clearance are offered?

A: Standard radial clearance 0-0.3 mm (Standard_SL). Precision classes P0, P6 and P5 available. Reduced clearance and preloaded variations available on request.

Q: What material and seal options apply?

A: Material of rings is 50Mn or 42CrMo4 steel with raceway induction hardening to 55-62 HRC. Ball material is GCr15 . Standard seals are NBR double lip.

Contact Us

For pricing, availability, technical drawings, or replacement specifications for VSU200644 Slewing Bearings, contact Heng Guan Bearing at mia@hgb-bearing.com.