single row ball slewing ring internal gear

Single Row Ball Slewing Ring Internal Gear | Four-Point Contact Design for Crane & Industrial Rotation Solutions

Luoyang Heng Guan Bearing Technology Co., Ltd., a modern enterprise specializing in high-precision bearing R&D and manufacturing, brings you our single row ball slewing ring internal gear – engineered for precision rotation in demanding industrial environments. Located in Luoyang, China's bearing industry hub, our team of over 50 engineers leverages 30+ years of expertise to deliver ISO9001-certified, RoHS-compliant solutions. Our four point contact ball Slewing Bearing internal gear standard single-row ball models span raceway diameters from 50mm to 10000mm, with precision grades covering P0, P6, P5, and P4. For larger diameters up to 10,000mm, we recommend our three-row roller series. This internal gear slewing bearing for crane applications features a compact four-point contact raceway that simultaneously handles axial, radial, and moment loads while maintaining smooth rotation – perfect for tower cranes, excavators, solar trackers, and offshore equipment where space and reliability are critical.

Core Product Strengths

✓ Four-Point Contact Raceway – Handles combined loads in a single compact unit

✓ Comprehensive Size Range – 25+ standard models (174.5mm–4500mm raceway diameter)

✓ Quick OEM Replacement – Rollix RKS-compatible geometry available

✓ Heavy-Duty Heat Treatment – CNC quenching ensures 58–62 HRC raceway hardness

✓ Global Compliance – Meets DIN, ISO, GB standards with full traceability

THREE MODEL QUICK REFERENCE TABLE

STRUCTURAL FEATURES

Your small internal gear slewing ring operates on a proven four-point contact principle: each steel ball touches the raceway at four distinct geometric points, distributing forces efficiently. Here's why this matters for your application:

Compact Integration – Unlike traditional Shaft-bearing assemblies, our light duty internal gear turntable bearing consolidates mounting flanges, rotation mechanism, and gear drive into one unit, saving 30–40% installation space.

Load Distribution Excellence – The 90° contact angle between ball and raceway creates a natural resistance to both thrust and radial forces. When your crane boom swings or your excavator rotates, the bearing distributes peak stresses across multiple contact points, preventing raceway spalling.

Internal Gear Advantages – The internal tooth slewing ring for excavator design protects gear teeth from external debris. You'll notice longer service life in dusty construction sites or marine environments where external gears would rapidly deteriorate.

Cross-Section Anatomy

· Outer Ring – Precision-machined mounting surface with internal gear teeth

· Inner Ring – Hardened raceway and through-holes for compact installation

· Steel Balls – High-carbon chrome steel (GCr15) with spacers preventing ball-to-ball contact

· Triple Sealing System – Dual lip seals + O-ring barrier against contamination

BALL SLEWING VS. CROSSED ROLLER COMPARISON

GEAR SPECIFICATIONS

All our radar antenna slewing ring internal gear models feature precision-cut internal teeth designed for smooth mesh engagement:

· Gear Cutting Method: CNC gear shaping or hobbing

· Material: 42CrMo or 50Mn alloy steel

· Surface Hardness: 45–55 HRC (tooth flank), 55–62 HRC (raceway)

· Precision Grade: DIN 6 standard (equivalent to ISO 1328-1)

· Optional Configurations: Non-hardened teeth for field machining, external gear variants, or toothless rings for friction-drive systems

TYPICAL APPLICATIONS

��️ Tower Crane Slewing

Your offshore crane slewing bearing internal gear withstands dynamic wind loads and heavy lifting cycles. Our 02-1050-00 model handles 120-ton lifting capacities in coastal wind farms.

⛏️ Excavator Upper Structure

Compact tower crane slewing ring internal tooth designs fit tight engine compartments while delivering 360° continuous rotation for construction excavator.

☀️ Solar Tracking Systems

Low-maintenance solar tracker slewing bearing internal gear models ensure precise azimuth adjustment with minimal power consumption over 25-year lifespans.

�� Radar & Antenna Platforms

Smooth rotation with less than 0.1° clearance makes our bearings ideal for military and civilian radar installations requiring precise target tracking.

�� Welding Positioners

Our welding positioner slewing ring internal gear handles thermal expansion cycles and provides stable rotation under high temperatures (up to 200°C with special grease).

⚓ Marine Deck Cranes

Triple-sealed marine winch turntable bearing internal gear units resist saltwater corrosion. Hot-dip galvanizing and special grease formulations extend service life in offshore environments.

CUSTOMIZATION CAPABILITIES

Heng Guan Bearing goes beyond standard catalogs for Single Row Ball Slewing Ring Internal Gear. Our engineering team provides:

✅ Reverse Engineering Service – No drawings? We'll measure your old bearing on-site and recreate it with optimized tolerances.

✅ Load-Specific Design – Submit your axial/radial/moment load data; we'll customize raceway profiles and ball diameters.

✅ Special Materials – Stainless steel (316L) for food excavator, 40Cr for cost-sensitive projects.

✅ Non-Standard Mounting – Custom bolt patterns, flange thicknesses, or plug-and-play OEM replacements.

✅ Fast Prototyping – Single-unit manufacturing for R&D validation before full production.

Note: We handle complete machining even without 3D CAD files – just provide reference dimensions.

FAQ

Q: What's the difference between 50Mn and 42CrMo material for single row ball slewing bearings?

A: 42CrMo offers superior impact toughness and hardenability, making it ideal for cold climates or high-shock applications like lifting excavator slewing bearing systems. 50Mn provides excellent cost-effectiveness for stable, moderate-load scenarios.

Q: How often should I lubricate the bearing?

A: Standard recommendation: every 100 operating hours. In high-dust environments (construction sites, solar farms), reduce to 50-hour intervals to flush out contaminants effectively.

Q: Can this replace a cross-roller bearing in my application?

A: If your primary concern is moment load capacity and cost efficiency – yes. However, if you need ultra-high stiffness for precision excavator, cross-roller designs are preferable. Our engineers offer free load analysis to confirm compatibility.

Q: Do you provide installation support?

A: Absolutely. We provide torque specifications, bolt-tightening sequences, and can dispatch engineers for on-site commissioning of critical projects.

Q: What's the lead time for custom sizes?

A: Standard models ship within 7–15 days. Custom designs typically require 4–6 weeks from drawing approval to shipment, depending on complexity.

Contact Us

Need a single row ball slewing ring internal gear tailored to your project? Our engineers are ready to assist.

Email: mia@hgb-bearing.com