VSI201094-N Slewing Bearings

VSI201094-N Slewing Bearings — INA VSI Standard 20 Internal Gear Four-Point Contact Ball Slewing Ring

VSI201094-N Slewing Bearings are the largest model in the INA VSI Standard 20 internal gear series. This single-row four-point contact ball slewing ring carries a 984 mm bore, 56 mm total height, and 91 kg weight. The internal gear runs at module 8 with 125 teeth, and static axial capacity reaches 1,770 kN — making it a common selection for tower cranes, heavy excavators, and large rotary equipment where combined axial, radial, and moment loads must be handled within a compact ring section.

Full Specifications

Structural Design Notes

The four-point contact ball configuration allows a single ball row to handle axial loads, radial loads, and tilting moments simultaneously. This removes the need for separate bearing arrangements in applications where combined loading is the norm, and it fits within the 56 mm section height of the VSI Standard 20 envelope.

The internal gear uses a normalized (N) tooth profile at module 8 with 125 teeth. A drive pinion meshes inside the ring bore, keeping the drive assembly within the machine footprint. This arrangement is typical for large tower crane swing sections and heavy excavator turntables where external gear clearance is not available.

Ring materials are 50Mn and 42CrMo4 alloy steel, both quenched and tempered for core toughness. Raceways are induction-hardened to 55–62 HRC for surface wear resistance while the core remains ductile enough to absorb shock loads. GCr15 bearing steel balls and double-lip NBR seals are used throughout, with a continuous operating range of -25 to +80 °C.

The VSI201094-N is mounting-compatible with the entire VSI Standard 20 series. Bolt patterns and interface dimensions remain consistent across the family: 48 × 14 mm through-holes on the outer ring (1,140 mm bolt circle) and 48 × M12 threaded holes on the inner ring (1,055 mm bolt circle).

Typical Applications

Tower Cranes and Large Lifting Cranes — The m8/z125 internal gear carries the high drive torques of a large crane slewing section. A static axial capacity of 1,770 kN supports heavy hook loads without raceway deformation under sustained use.

Excavators and Heavy Construction Excavator — Heavy excavator turntables pair this ring with an inside swing pinion. The four-point contact design maintains clearance stability during the shock and vibration that occur through digging cycles.

Wind Turbine Yaw Systems — Yaw bearing assemblies in the 1 m diameter range use internal-gear rings with inside yaw drive pinions. The sealed assembly and -25 to +80 °C rated range suit outdoor installation across varying climates.

Large Rotary Turntables and Indexers — Process turntables, rotary indexers, and test platforms use internal-gear rings to keep the drive inside the table footprint, reducing overall machine width.

Radar and Antenna Structures — Large rotating antenna structures and similar equipment in the 1 m band benefit from the combined tilting-moment capacity of the four-point contact structure.

Manufacturing and Quality

Heng Guan Bearing is based in Luoyang and produces VSI201094-N Slewing Bearings using CNC vertical lathes, CNC quenching machines, CNC gear shapers, grinding machines, and large gear hobbing machines. Dimensional inspection uses coordinate measuring machines. Products comply with DIN, ISO, and GB standards and are RoHS compliant. Full material traceability is maintained from raw steel to finished ring.

Precision grades P5 and P6 are available if the application requires tighter rotational accuracy beyond the standard P0 class. OEM and ODM programs are supported. If you need to match a worn bearing from an existing machine, dimensional data and drawings can be provided to assist with identification.

FAQ

Q: What is VSI201094-N?

A: VSI201094-N is an internal-gear four-point contact ball slewing ring from the INA VSI Standard 20 series and the largest internal-gear model in that family. Key dimensions are 984 mm bore, 56 mm height, and 91 kg weight, with internal gear m8/z125.

Q: What are the load ratings?

A: Dynamic axial Ca = 198 kN, static axial C0a = 1,770 kN, dynamic radial Cr = 179 kN, static radial C0r = 810 kN. Gear tooth force limits are 31.4 kN continuous and 46.7 kN peak.

Q: How does VSI201094-N differ from VSA201094-N and VSU201094?

A: All three share the VSI Standard 20 envelope with 56 mm height and the same raceway band. VSI201094-N has internal gear teeth (m8/z125). VSA201094-N has external gear teeth (m8/z148). VSU201094 is gearless at 77 kg. Selection depends on drive pinion configuration.

Q: Is this an OEM replacement for INA VSI201094-N?

A: Yes. Heng Guan supplies bearings to the identical mounting standard as the original INA reference. "INA" is a third-party trademark referenced for compatibility description only.

Q: What bolt grade is required for installation?

A: High-strength bolts of grade 10.9 or 12.9 (ISO) are required. Fully threaded bolts should not be used — the unthreaded shank must sit in the shear plane.

Q: What is the re-lubrication interval?

A: For heavy equipment such as excavators and cranes, raceway re-lubrication every 100 operating hours is standard practice. In high-humidity environments, increasing this frequency helps flush out moisture.

Contact Us

For availability, pricing, CAD drawings, or application questions about VSI201094-N Slewing Bearings, contact Heng Guan Bearing directly at mia@hgb-bearing.com.