Slewing Bearing Knowledge - LDB

How to Match a Slew Drive to Your Load and Rotation Needs: A Step-by-Step Selection Guide

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Slew Drive?

A slew drive is a compact gearbox that combines a slewing bearing with a worm gear or spur gear mechanism. It is used to produce rotational movement while simultaneously supporting axial, radial, and tilting moment loads. Slew drives are commonly used in machinery that requires reliable, low-speed rotation under load—such as solar trackers, cranes, excavators, wind turbines, and automation equipment.

To ensure optimal performance, selecting the right slew drive involves evaluating both load capacity and rotation requirements. Improper selection may lead to premature failure, inefficient movement, or safety issues.

LDB Slew Drive Portfolio Overview

LDB is a global manufacturer and supplier of industrial slew drives with a full product line designed to cover light, medium, and heavy-duty rotation needs.

LDB Series Overview:

Series	Gear Type	Key Applications
SE Series	Worm	Solar tracking, small cranes, hoists
VE Series	Worm	CSP systems, antennae, light lifting
HSE Series	Worm	Heavy-duty dual-axis systems
SDE-PDE Series	Dual-Worm	Precision + heavy-load CSP systems
S Series	Worm	Entry-level solar applications
SG-L / M / H	Spur Gear	Robotics, automation, vehicle-mounted units

Step 1: Determine Load Characteristics

Axial Load (Fₐ)

This is the force acting parallel to the axis of rotation. Example: downward force from solar panels.

Radial Load (Fᵣ)

Force acting perpendicular to the axis—typically from wind or mechanical impact.

Moment Load (M)

This is the torque generated due to off-center loads—critical in cranes and lifting arms.

Use the combined load formula:

M = F * d
(Where F is load and d is the distance from the rotation center)

Step 2: Evaluate Rotational Requirements

Rotation Range

Do you need 90°, 180°, 360° or continuous rotation?

For tracking systems: 90°–120°

For robotics or lifting: Up to 360° or continuous (with slip rings)

Rotation Speed

Slew drives are typically low-speed (<10 rpm), but you must align gear ratio with the required angular velocity.

Precision

Standard worm drives offer medium backlash

Dual-worm or spur gear drives offer finer control and lower backlash

Step 3: Choose Between Worm and Spur Gear Systems

Requirement	Recommended Gear Type
Self-locking (no back-driving)	Worm Gear
High precision & speed	Spur Gear
Cost-effective solar tracking	Worm Gear
Responsive automation	Spur Gear

Example Matchups:

HSE Series = CSP solar trackers requiring dual-axis and high torque

SG-M Series = Precision robotics with multiple rotation cycles per minute

Step 4: Consider Mounting and Space Constraints

Choose between horizontal and vertical installation orientation

Assess envelope size—LDB offers models from 200mm to 1200mm in diameter

Flange mounting or face-mounting configurations available

Step 5: Verify Environmental Protection and Sealing

Outdoor systems (e.g., solar, cranes) need IP65+ enclosures

For corrosive environments, opt for stainless steel or coated housing

LDB offers marine-grade sealing and UV-resistant paint

LDB Slew Drive Models with Load & Torque Guide

Model Series	Max Output Torque (Nm)	Output Speed (rpm)	Self-Locking	Gear Type
SE-9	1,200	1.5	Yes	Worm
VE-14	4,500	0.8	Yes	Worm
HSE-2-21	15,000	0.4	Yes	Dual-Worm
SG-H	8,000	3.0	No	Spur

Contact LDB for CAD files and performance curves.

Slew Drive Pricing Reference

Type	Torque Class	Price Range (USD)
SE Series	Light duty	$250 – $850
HSE Series	Heavy duty	$1200 – $3000+
SG Spur Gear	Precision class	$800 – $1800

LDB offers volume-based pricing, OEM customization, and short lead times.

Why Choose LDB as Your Manufacturer and Supplier?

20+ years of engineering excellence

Fully CNC-machined worm and gear sets

ISO9001 and CE certified production

Global delivery and multilingual support

Custom motor interface and braking solutions available

Whether you are building solar fields, automation lines, or lifting equipment, LDB provides not only the product but the engineering insight for lasting performance.

Conclusion

Choosing the right slew drive is not just about torque—it’s about ensuring the perfect balance of load, motion, precision, and protection. With LDB’s wide selection and expert support, your equipment will run stronger, smoother, and smarter.

Contact LDB today to get expert guidance and a quote tailored to your load and rotation needs.

How to Maintain and Extend the Life of Slewing Bearings in Harsh Environments

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Are Slewing Bearings and Why Is Maintenance Critical?

Slewing bearings are large, precision-engineered components used to support axial, radial, and overturning moment loads in rotating structures. They are commonly found in cranes, excavators, wind turbines, solar trackers, and offshore platforms. In harsh environments—such as extreme temperatures, marine conditions, dusty mines, and desert regions—proper maintenance is not optional; it’s essential.

Without routine maintenance, slewing bearings can suffer from corrosion, grease degradation, raceway wear, and premature failure. In mission-critical systems, such failures may result in expensive downtime, safety hazards, or even structural damage.

Common Environmental Challenges for Slewing Bearings

Environment	Threats
Marine	Saltwater corrosion, humidity, biofouling
Desert	Fine dust intrusion, temperature swings
Arctic	Low temperatures, ice buildup
Mining & Cement	Abrasive dust, heavy shock loads
Offshore Wind	High humidity, salt-laden air, turbine stress

Best Practices for Slewing Bearing Maintenance

Regular Lubrication

Use the correct grease: EP2, lithium complex, or marine-grade grease for offshore.

Lubricate every 100–200 hours of operation, or every month for idle equipment.

Apply grease at each lube point until old grease is pushed out—this flushes contaminants.

LDB Tip: Use a grease gun with pressure gauge to ensure proper penetration. LDB supplies matched grease kits for all slewing models.

Sealing System Inspection

Check for cracked, brittle, or missing seals.

In marine or desert environments, labyrinth or multi-lip seals are recommended.

Replace damaged seals immediately to prevent dust, water, or salt ingress.

LDB offers seal upgrade kits for all standard slewing rings.

Bolt Tightening and Preload Checking

Perform bolt torque checks every 500 operating hours.

Use a calibrated torque wrench; overtightening can deform the bearing ring.

Replace any corroded or elongated bolts with high-grade (10.9 or 12.9) replacements.

LDB Maintenance Kit includes torque specs for each model.

Raceway and Gear Tooth Monitoring

Use an endoscope or grease inspection to detect wear debris in raceways.

Check backlash and gear engagement every 6–12 months.

Re-lap or replace severely worn gears.

LDB bearings are manufactured with hardened raceways (HRC 55–62) and self-cleaning gear profiles for extended service life.

Corrosion Prevention

Apply anti-corrosion coatings (zinc or epoxy) to exposed areas.

Store bearings in dry, climate-controlled conditions if unused.

Use protective covers during shipment and long-term storage.

LDB offers optional anti-rust oil film, phosphate coatings, and sealed export crates.

Maintenance Tools and Spare Parts from LDB

Sealing Rings (NBR, FKM, or marine-grade)

Bolt Replacement Kits

Grease Injection Valves

Rotation Test Tools

Wear Measurement Calipers

Replacement Gear Segments

All spare parts can be ordered directly from LDB, your trusted manufacturer and supplier.

Signs Your Slewing Bearing Needs Service or Replacement

Symptom	Possible Cause
Audible grinding	Lack of lubrication
Uneven rotation or binding	Gear misalignment or damage
Excessive backlash	Worn teeth or lost preload
Grease leakage	Damaged seal
Rust or pitting	Corrosion from water ingress

If detected early, many issues can be resolved with on-site repair, saving costs and extending service life.

Recommended Maintenance Schedule

Task	Frequency
Visual Inspection	Weekly
Lubrication	Monthly or 100–200h
Bolt Torque Check	Quarterly
Gear/Backlash Measurement	Semi-annually
Seal Inspection	Annually

LDB provides a downloadable Maintenance Log Sheet and PDF checklist tailored to your specific bearing model.

Why LDB Bearings Last Longer

Hardened raceways with deep quenching

360° sealing options for extreme conditions

High-precision machining (≤0.01mm runout)

Tested under vibration and salt spray simulations

Customized gear treatments for heavy-duty wear resistance

As a seasoned manufacturer and global supplier, LDB delivers reliability, from steel selection to surface treatment.

Conclusion

Slewing bearings are not “fit and forget” components—especially in harsh environments. By adopting a proactive maintenance routine and sourcing spare parts from trusted suppliers like LDB, you extend bearing life, improve system safety, and reduce lifecycle costs.

�� Reach out to LDB for maintenance kits, custom protection options, or service training tailored to your application.

How to Choose the Right Slewing Bearing for Heavy-Duty Equipment

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Slewing Bearing?

A slewing bearing, also known as a slewing ring or turntable bearing, is a specialized bearing that allows rotational movement between two components, typically supporting axial, radial, and moment loads simultaneously. These bearings are essential in heavy-duty machinery where large-scale, slow-speed rotational motion is required—such as in excavators, cranes, wind turbines, and offshore platforms.

Slewing bearings are designed to handle complex mechanical demands while operating reliably under harsh environmental conditions. They are available in various configurations depending on the load, motion requirements, and application.

Key Types of Slewing Bearings and Their Applications

Understanding the differences between slewing bearing types is crucial in selecting the right model. The most common options include:

Four Point Contact Ball Slewing Bearing

Structure: Single row, four-point contact ball design

Applications: Cranes, excavators, rotating platforms

Benefits: Supports axial and moment loads in both directions with compact design

Double Row Ball Slewing Bearing

Structure: Two rows of balls for increased load capacity

Applications: Tower cranes, construction equipment

Benefits: Enhanced axial and radial load support

Three-Row Roller Slewing Bearing

Structure: Three separate raceways for radial, axial, and moment load separation

Applications: Offshore cranes, tunnel boring machines, wind turbines

Benefits: Extremely high load capacity and stability

Cross Roller Slewing Bearing

Structure: Cylindrical rollers arranged in a crossed pattern

Applications: Robotics, precision rotating platforms

Benefits: High precision and rigidity with minimal clearance

Flanged Slewing Bearing

Structure: Built-in flange on inner or outer ring

Applications: Compact equipment, robotics, solar trackers

Benefits: Easy installation and alignment, space-saving

Factors to Consider When Selecting a Slewing Bearing

Choosing the right slewing bearing depends on several performance and application parameters:

Load Characteristics

Determine the magnitude and direction of axial, radial, and moment loads.

Three-row roller bearings are best for extreme loads; four-point contact bearings suit moderate applications.

Rotational Speed and Precision

High-precision systems like robotics may require cross roller bearings with minimal backlash.

For slow and intermittent rotation, double-row or four-point contact bearings suffice.

Installation Space

Flanged bearings are ideal for tight spaces due to their integrated mounting features.

Select compact designs for mobile machinery or space-limited environments.

Environmental Conditions

Marine, desert, or arctic conditions require corrosion-resistant materials, seals, and special greases.

LDB offers anti-rust coatings and special sealing options for harsh environments.

Mounting and Maintenance

Evaluate ease of installation, lubrication accessibility, and service intervals.

LDB provides detailed mounting instructions and optional maintenance-free solutions.

LDB Slewing Bearing Solutions

As a global manufacturer and supplier, LDB offers a comprehensive line of slewing bearings engineered for industrial, construction, and energy applications. All products are manufactured under ISO 9001 standards and can be customized according to project requirements.

Popular Models:

Four Point Contact Ball Slewing Bearing (LDB-FQ Series)

Double Row Ball Slewing Bearing (LDB-DB Series)

Three-Row Roller Slewing Bearing (LDB-TR Series)

Cross Roller Slewing Bearing (LDB-CR Series)

Flanged Slewing Bearing (LDB-FL Series)

Price Considerations

Slewing bearing prices vary depending on size, material, and load capacity. Below is a general guide:

Bearing Type	Typical Price Range (USD)
Four Point Contact Ball	$150 – $600
Double Row Ball	$400 – $1000
Three-Row Roller	$900 – $3000+
Cross Roller	$300 – $1200
Flanged Slewing Bearing	$180 – $800

LDB provides factory-direct pricing, volume discounts, and tailored quotes for OEM and system integrators.

Finding the Right Manufacturer and Supplier

Choosing a reliable slewing bearing supplier is essential for ensuring performance, safety, and longevity. LDB stands out by offering:

Global delivery capabilities

In-house design and technical support

Long-term spare parts availability

Custom manufacturing options (diameter, bolt pattern, coating)

As a trusted manufacturer, LDB has successfully served customers in over 50 countries and supports industries ranging from construction to clean energy.

Why Choose LDB?

20+ Years of Experience in slewing technology

Advanced Production Lines and CNC machining centers

Testing Facilities for load, vibration, and fatigue simulation

Comprehensive Product Catalog with over 1000 models

After-Sales Support including technical training and online diagnostics

Conclusion

Selecting the right slewing bearing is about more than size—it’s about load, precision, environment, and reliability. By understanding the key bearing types and application needs, you can optimize performance and extend machine life. With LDB’s technical support, manufacturing excellence, and global service, you can confidently select the ideal slewing bearing solution.

Ready to choose your bearing? Contact LDB today for a tailored recommendation and competitive pricing.

How to Choose the Right Slewing Bearing for Construction Equipment Applications

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Slewing Bearing?

A slewing bearing is a precision-engineered mechanical component that facilitates rotational movement between two structures. It supports axial, radial, and moment loads, and is commonly used in construction equipment such as cranes, excavators, concrete pumps, and aerial work platforms. These large-diameter bearings are critical for heavy-duty turning applications, enabling machines to rotate smoothly while managing intense loads and environmental stress.

Choosing the right slewing bearing is not just a matter of size—it requires a thorough understanding of application needs, load dynamics, environmental conditions, and product lifespan. In this article, we’ll walk you through a complete guide to selecting the best slewing bearing for construction machinery.

Key Factors When Selecting Slewing Bearings

Load Type and Magnitude

Understand whether your machine is exposed to:

Axial loads (vertical weight)

Radial loads (horizontal stress)

Overturning moment (torque from off-center loads)

For instance:

Excavators require strong moment load resistance

Tower cranes need high axial load-bearing capacity

Drilling rigs must handle both high torque and axial thrust

Use accurate force analysis or simulation data (like FEA) to determine expected load ranges.

Rotation Speed and Duty Cycle

Aerial platforms with slow, infrequent rotation require different bearings than high-speed drilling rigs or tunnel boring machines. Choose:

Ball slewing bearings for low-speed, low-friction applications

Roller slewing bearings for high-load or rotational inertia

Installation Space and Mounting Type

Assess diameter, bolt hole placement, and flange structure:

Internal gear bearings save external space

External gear allows better torque transmission

Non-gear options exist for systems using external drives

Recommended Slewing Bearing Types for Construction Equipment

Four Point Contact Ball Slewing Bearing

Excellent for cranes and work platforms

Handles combined loads efficiently

Compact and cost-effective

Double Row Ball Slewing Bearing

Supports higher axial and radial loads

Used in heavy-duty crawler cranes and drilling machines

Higher stability due to dual-row configuration

Cross Roller Slewing Bearing

High stiffness and precision

Ideal for tight installation spaces

Preferred in high-torque applications like foundation machines

Three-Row Roller Slewing Bearing

Superior load handling in all directions

Large size, heavy-duty

Suitable for bucket wheel excavators and heavy mining cranes

Environmental Considerations

Construction equipment faces harsh field conditions:

Dust and sand (grit contamination risk)

Mud and water (requires IP-rated sealing)

Temperature extremes (from -30°C to +70°C)

LDB slewing bearings are available with:

Triple lip seals

Grease ports for regular lubrication

Chrome-plated raceways for corrosion resistance

Customization and Mounting Options

Some machines require non-standard mounting holes or flange connections. LDB offers:

Custom bolt hole patterns

Split bearings for large-diameter applications

Optimized raceway geometry

Reinforced gear tooth hardening for longer service life

Typical Price Range and Procurement Tips

The price of slewing bearings for construction depends on:

Outer diameter and gear type (internal/external/no gear)

Load class and material grade

Sealing systems and certification (CE, ISO, etc.)

Typical Price Range: USD $400 – $6,000 per unit
Custom-engineered options may cost more depending on complexity and volumes.

To find a reliable manufacturer or supplier, consult technical teams and request:

2D/3D drawings

Load rating documentation

Lifetime fatigue calculation

Visit www.ldb-bearing.com for quotes and technical assistance.

Why LDB Is a Trusted Partner in the Construction Industry

LDB is a globally recognized manufacturer and supplier of slewing bearings for heavy-duty construction applications. With:

20+ years of experience

Advanced CNC production lines

Custom machining for OEM partners

Robust inventory and fast shipping options

LDB supports clients from design to delivery. Our products are used in:

Mobile and tower cranes

Tracked excavators

Earth drills and piling rigs

Material handling booms

Final Advice: Ask the Right Questions

Before placing an order, ask:

What’s the actual working load and peak load?

What’s the expected rotational speed and duty cycle?

Is environmental protection a priority?

Are maintenance intervals important?

Choosing the wrong bearing can lead to frequent breakdowns or costly repairs. LDB ensures that your slewing bearing delivers reliable, long-term performance no matter how tough the construction site.

For application-matched solutions, contact us at www.ldb-bearing.com.

Flanged Slewing Bearings: When and Why to Use Them in Compact Rotating Applications

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Flanged Slewing Bearing?

A flanged slewing bearing is a specialized type of slewing ring that integrates a flange—usually on either the inner or outer ring—into its design. The flange serves as a built-in mounting surface, allowing for simplified installation without additional mounting plates or housing structures. These bearings retain the core function of supporting axial, radial, and moment loads while offering improved alignment and space-saving benefits.

Flanged slewing bearings are especially popular in applications requiring compact structures, lightweight systems, and easy mounting. From robotics to aerial platforms, these precision components offer mechanical versatility and operational convenience.

Structural Advantages of Flanged Slewing Bearings

Flanged slewing bearings can be manufactured in multiple configurations:

Flange on Outer Ring: Easier to mount to static structures

Flange on Inner Ring: Preferred for rotating components

Dual-Flanged Design: Offers higher rigidity and symmetrical support

These bearings can be:

Gearless

Internally geared

Externally geared

Why Choose a Flanged Slewing Bearing?

Flanged slewing bearings are ideal when you need:

Compact Design

The integrated flange reduces the need for additional mounting components, saving space and weight.

Simplified Installation

No welding or complex housing required—just bolt-on mounting to existing structures.

High Positional Accuracy

Improved alignment and rigidity make them suitable for indexing or positioning tables.

Cost-Efficiency

Less fabrication required for housings or base structures translates into reduced system costs.

LDB Flanged Slewing Bearing Solutions

As a global manufacturer and supplier, LDB offers a wide range of high-quality flanged slewing bearings under its LDB-FL Series, designed to fit various industrial, automation, and energy applications.

Key Features of LDB-FL Series:

Outer Diameter Range: 200mm – 1600mm

Gear Types: External, Internal, or None

Bolt Hole Pattern: Customizable

Flange Position: Inner or Outer Ring

Materials: 50Mn or 42CrMo with raceway hardening

Sealing: Labyrinth or contact seals available

Customization Support:

CAD drawings with bolt alignment

Surface treatment options (phosphate, zinc, chrome)

Special lubricant or food-grade grease

Common Applications

Application Type	Why Flanged Bearings Fit
Industrial Robotics	Precise alignment in base joints
Medical Equipment	Compact and lightweight movement
Solar Trackers	Streamlined structural connection
Aerial Work Platforms	Light weight, easy serviceability
Stage & Lighting Systems	Simple rotation mechanism
Food & Beverage Machines	Sanitary, sealed construction

Installation Tips

Ensure bolt torque follows manufacturer specs to avoid deformation

Clean flange surface before assembly for best alignment

Use alignment pins in high-precision applications

Recheck gear mesh and preload after initial installation

Flanged Bearing vs Standard Slewing Bearing

Feature	Flanged Bearing	Standard Slewing Bearing
Installation	Bolt-on, direct mounting	Requires external mounting ring or plate
Weight	Lighter overall	Heavier, depending on housing
Assembly Time	Faster	Requires more setup
Common Applications	Compact/lightweight design	Heavy machinery, cranes

Typical Price Range and Specifications

The price of flanged slewing bearings depends on size, flange location, and load rating. LDB offers competitive factory-direct pricing with customization support.

Size (Outer Diameter)	Price Range (USD)	Gear Option
200–600 mm	$180 – $600	Gearless or internal
600–1000 mm	$600 – $1200	External gear
1000–1600 mm	$1200 – $2500+	Custom gear profile

Supplier Note: LDB supports OEM orders, bulk purchasing discounts, and just-in-time shipping for industrial assembly lines.

Why Choose LDB as Your Manufacturer and Supplier?

Precision Manufacturing: Advanced CNC machining ensures concentricity and raceway accuracy

Material Quality: All raceways hardened to HRC 55–62

Flexible Engineering: Tailored flange size, gear ratio, and hole placement

Global Delivery: Fast shipping from China to Europe, North America, and Southeast Asia

Support Services: Drawing consultation, installation guidance, technical training

As both manufacturer and supplier, LDB delivers high-value flanged slewing bearings with reliability and responsiveness.

Conclusion

If your project requires compactness, fast installation, and precision rotation, flanged slewing bearings are the right fit. With LDB’s engineering support and high-performance product line, integrating these bearings into your machine architecture becomes simple and efficient.

Ready to get started? Contact LDB today to explore our flanged bearing catalog or request a customized quote.

Flanged Slewing Bearings: The Space-Saving Solution for Modern Machinery Designs

July 21, 2025/in LDB Company News, Slewing Bearing Knowledge /by ldbadmin

What Is a Flanged Slewing Bearing?

A flanged slewing bearing is a variant of traditional slewing rings that features a flange structure on either the inner or outer ring. This design enables more convenient installation by eliminating the need for a separate mounting plate or housing support.

Compact, lightweight, and easy to align, flanged slewing bearings are ideal for applications with space constraints or strict mounting precision requirements. They are commonly used in packaging equipment, robotic arms, small cranes, rotating displays, and automated guided vehicles (AGVs).

Key Advantages of Flanged Slewing Bearings

Simplified Installation

Flanged designs allow for direct bolt-on mounting to a surface or housing. This reduces the need for support rings, minimizes alignment error, and shortens assembly time.

Reduced Structural Footprint

With fewer components and a unified load-bearing surface, flanged slewing bearings contribute to overall space savings. This is critical in compact systems like AGVs, medical imaging tables, and miniaturized automation lines.

Integrated Load Handling

Despite their slim form, flanged slewing bearings support:

Axial loads (vertical pressure)

Radial loads (horizontal forces)

Tilting moments (overturning torque)

Depending on raceway and ball arrangement, they can deliver precise, high-stiffness rotation under demanding conditions.

Cost-Efficient Engineering

Reduced components mean lower material and labor costs. Maintenance is simpler and access is easier, making flanged designs more budget-friendly over the long term.

Application Scenarios for Flanged Slewing Bearings

Industry	Use Case
Robotics	End-of-arm tooling, base rotation joints
Packaging Machinery	Rotary cutters, feeders, labelers
Medical Devices	CT scanners, X-ray table pivots
AGVs & Mobile Robots	360° sensor platforms, turret mechanisms
Aerospace Equipment	Lightweight satellite tracking antennas
Display & Exhibitions	Rotating product stages and podiums

LDB Flanged Slewing Bearings: Precision Meets Performance

LDB, a leading global manufacturer and trusted supplier, offers a wide portfolio of flanged slewing bearings with precision-grade performance. Our range includes:

External Flange Bearings: Flange on outer ring for interior mount

Internal Flange Bearings: Flange on inner ring for external mount

Gearless or Geared Options: External, internal, or non-geared as needed

Custom Drilling Patterns: To fit OEM platforms perfectly

Product Highlights:

Outer diameters from 200 mm to 1500 mm

Standard and custom gear modules

Slim profile with deep groove or four-point contact ball structure

Hardness-tested gear teeth and raceways

Optional rust-proof coatings and dust seals

Selecting the Right Flanged Slewing Bearing

Consider These Parameters:

Load type: static or dynamic

Rotation speed and duty cycle

Mounting surface flatness

Gear interface (motor, servo, or direct drive)

Environmental exposure: moisture, dust, chemicals

LDB engineers provide 1-on-1 support to help customers select models based on technical drawings, FEA simulations, or prototype testing.

Typical Price Range & Procurement Insights

The price of flanged slewing bearings is affected by:

Flange placement and drilling complexity

Diameter and thickness of raceways

Gear requirements

Surface treatment (e.g., phosphate, chromate)

Typical Price Range: USD $150 – $2,000 per unit (Custom flanged types may exceed depending on volume and spec.)

LDB’s global supplier network ensures fast delivery and localized support for high-volume and prototype orders alike. Visit www.ldb-bearing.com to learn more.

Why LDB Is the Preferred Flanged Slewing Bearing Partner

ISO-certified manufacturing with strict quality controls

Fast lead times for standard SKUs

CAD-ready models for OEM design integration

In-house customization from design to delivery

Full-service support: engineering, logistics, and after-sales

We supply top-tier flanged slewing bearings to clients across automation, aerospace, defense, healthcare, and logistics.

Final Thoughts

Flanged slewing bearings strike a perfect balance between space efficiency and structural strength. Their integrated mounting capability and streamlined profile help modern engineers build more compact, precise, and cost-effective systems.

As industries demand more from less, LDB delivers. Our flanged slewing bearings offer the performance and practicality needed to power modern innovation.

Looking for a custom solution or need help selecting a part? Contact LDB at www.ldb-bearing.com for personalized support.

Flanged Slewing Bearings: Compact Power for Streamlined Engineering

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What is a Flanged Slewing Bearing?

A Flanged Slewing Bearing is a specialized type of slewing ring designed with an integrated flange along either the inner or outer ring. This flanged design simplifies mounting, reduces weight, and enables integration into systems with tight spatial constraints. Unlike traditional slewing bearings that often require external mounting plates or supports, flanged bearings can be directly bolted to adjoining structures, improving installation efficiency.

Flanged slewing bearings are widely used in applications such as robotics, automation systems, lifting platforms, and small construction equipment—especially where compact design, lightweight assembly, and rapid installation are critical.

Structural Benefits

Integrated Flange Design
The flanged profile eliminates the need for separate mounting flanges or adapter rings, reducing system complexity.

Space and Weight Efficiency
Ideal for applications with compact mechanical envelopes. By reducing material bulk, flanged bearings help engineers save both space and weight.

Easy Mounting
The flange provides a straightforward, bolt-on solution that simplifies installation, maintenance, and replacement operations.

Reliable Load Handling
Despite their compact size, flanged bearings still maintain the ability to handle combined axial, radial, and moment loads.

Gear and Non-Gear Options
Available with internal gears, external gears, or no gear, depending on the torque transmission needs of the system.

Common Applications

Robotic Arms and Automated Equipment: For fast, accurate rotational motion in confined workspaces.

Turntables and Rotating Displays: Providing quiet and stable movement in commercial kiosks and stage equipment.

Aerial Lifts and Small Cranes: Ensuring safe rotation with minimum structural overhead.

Medical Devices: In diagnostic and surgical equipment where quiet and smooth rotation is vital.

Vehicle-Mounted Systems: Where low weight and vibration resistance are important.

LDB’s Flanged Slewing Bearing Lineup

LDB Bearing offers a full series of flanged slewing bearings tailored for space-sensitive industrial applications. All units are manufactured with premium 42CrMo or 50Mn steel, precision-ground raceways, and GCr15 steel rolling elements.

Technical Highlights:

Outer Diameter Range: 200 mm to 3000 mm

Flange Types: Inner flange, outer flange, dual flange on request

Sealing: Labyrinth and rubber seals for dust and moisture protection

Lubrication: Factory-greased and optionally fitted with lube nipples

Customization: Bolt patterns, gear modules, and preload tuning available

LDB also supports non-standard designs for integration into automated guided vehicles (AGVs), camera systems, or specialized industrial robots.

Pricing, Supplier, and Manufacturer Insights

As a seasoned manufacturer and global supplier, LDB has developed deep expertise in precision bearing design, serving clients across more than 50 countries.

Price Determinants:

Outer diameter and flange thickness

Gear type and tooth accuracy

Application-specific modifications

Surface coatings and mounting hole patterns

Typical Price Range: USD $150 to $2500 per unit depending on size, material, and gear configuration.

LDB provides full technical support from pre-sales consultation to post-installation diagnostics. Customers can request quotes, catalogs, and product models via LDB’s official platform.

Why Choose LDB for Flanged Slewing Bearings?

Fast prototyping and short lead times

CAD-integrated design support

ISO-certified production and strict QA process

Lightweight, durable bearings trusted by OEMs worldwide

Full-service support including application simulation and load analysis

LDB’s flanged slewing bearings have already been successfully implemented in medical automation, compact lifting platforms, and aerospace ground support systems.

Conclusion

Flanged Slewing Bearings strike the perfect balance between strength and simplicity. Their bolt-on versatility and compact form make them the preferred choice for engineers designing space-sensitive rotational systems. With LDB as your supplier and manufacturer, you gain the benefit of precision, scalability, and long-term reliability in a world-class product.

Double the Power: Understanding Double Row Ball Slewing Bearings

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What is a Double Row Ball Slewing Bearing?

A Double Row Ball Slewing Bearing is a rotational rolling-element bearing with two rows of steel balls that contact the raceways at varying angles. Compared to single-row designs, double row slewing bearings offer higher axial and radial load capacity and are especially suited for applications requiring robust and stable support under heavy-duty operations.

This bearing type is widely used in construction equipment, port machinery, and wind power systems where high load demands, space efficiency, and long service life are essential.

Structural Advantages

Enhanced Load Distribution
Two rows of balls provide more contact points, distributing loads more evenly across the raceways and improving bearing rigidity and rotational accuracy.

Increased Axial and Radial Load Capacity
Double row ball designs can handle higher axial and tilting moment loads than four-point contact bearings, making them ideal for large cranes, rotary drills, and offshore platforms.

Vibration and Shock Resistance
The enhanced structure improves resistance to external shock and vibrations, ensuring operational safety in harsh environments.

Gear Customization
LDB provides these bearings with internal gear, external gear, or gearless designs to fit specific application needs.

Common Applications

Truck Cranes and Tower Cranes: Supporting large, rotating superstructures under dynamic loading conditions.

Harbor and Container Machinery: Handling high-speed, high-frequency operations.

Large Excavators and Rotary Drilling Rigs: Providing stable rotation for precision digging and drilling.

Wind Power Equipment: Used in yaw and pitch systems to support nacelle rotation.

LDB’s Double Row Ball Slewing Bearing Highlights

LDB Bearing manufactures its double row ball slewing bearings with high-grade materials like 42CrMo for rings and GCr15 for balls. All raceways are precision-ground, and surface hardening ensures durability under extreme loads.

Technical Parameters:

Outer Diameter Range: 500 mm to 6000 mm

Ball Row Configurations: Equal diameter or stepped ball rows for customized force management

Sealing: Labyrinth and contact seals for dust and water ingress protection

Lubrication: Factory-lubricated with optional automatic greasing systems

LDB also supports customer-specific bolt hole layouts, custom sealing systems, and integrated gear teeth hardening.

Pricing, Supplier, and Manufacturer Information

LDB Bearing is a leading manufacturer and supplier of high-load slewing rings, including double row ball slewing bearings, with over 20 years of experience. Located in Luoyang, China, LDB supplies to more than 50 countries across construction, energy, and port logistics industries.

Price Factors Include:

Outer diameter and thickness

Gear type and material selection

Surface coating and sealing configuration

Custom options and volume

Typical price ranges from USD 800 to USD 5000 depending on the specification. Clients can request quotations and CAD drawings directly via LDB’s website.

Why Choose LDB?

In-house manufacturing and heat treatment

Fast production cycles and global shipping

ISO 9001-certified QA system

Responsive pre- and post-sales engineering support

Whether you’re integrating slewing bearings into a crane, drill rig, or wind turbine, LDB’s double row ball slewing bearings provide the performance and reliability required for continuous operation.

Conclusion

Double Row Ball Slewing Bearings represent a perfect combination of strength, flexibility, and durability. With LDB’s engineering expertise and proven quality, your machinery can reach new heights of stability and load capacity. Choose LDB for world-class slewing solutions built to last.

Double Row Ball Slewing Bearings: Dual Performance for Heavy-Duty Precision Applications

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Double Row Ball Slewing Bearing?

A double row ball slewing bearing is a large-diameter rotational bearing that contains two rows of steel balls arranged in staggered or parallel configurations. These bearings are designed to simultaneously support axial, radial, and moment loads with enhanced stability and durability, making them ideal for large industrial machinery and heavy-equipment applications.

Unlike single-row slewing rings, the double-row design increases load-bearing capacity, improves torque resistance, and ensures smoother rotational behavior under dynamic and static forces.

Why Choose a Double Row Ball Slewing Bearing?

Increased Load Capacity

With two raceways and more rolling elements, double-row designs can handle up to twice the load of standard single-row bearings, especially in crane booms, excavators, and drilling rigs.

Improved Rotational Stability

The additional row of balls provides better resistance to tilting moments and ensures more even distribution of forces along the raceway, minimizing deflection.

Versatile Gear Configurations

These bearings are available with:

External gear teeth

Internal gear teeth

Non-geared (for separate drive systems)

Gear modules can be tailored to match the application’s torque and speed requirements.

Lower Maintenance Costs

Longer service life and reduced stress per ball lead to fewer replacements and less downtime.

Common Application Scenarios

Industry	Application
Construction	Excavators, mobile cranes, piling rigs
Marine Engineering	Deck cranes, offshore hoisting systems
Wind Energy	Yaw drives in onshore wind turbines
Tunneling Equipment	TBMs, rotating platforms
Forestry & Logging	Heavy-duty loaders, cutters

LDB Double Row Slewing Bearing Lineup

As a globally recognized manufacturer and supplier, LDB offers a full spectrum of double row slewing bearings from 800 mm to 4500 mm in diameter, including:

Parallel ball row configuration for symmetric loads

Different diameter row design for unbalanced loads or compact envelopes

Induction-hardened raceways and gear teeth

Integrated seals for dusty or corrosive environments

Custom bolt hole patterns and flange connections

Key Specs:

Axial load rating: Up to 6000 kN

Moment load: Up to 1000 kNm

Rotation speed: ≤ 1 rpm (typical for heavy-duty use)

Gear module: M5 – M20 (custom available)

Typical Price Range & Procurement Tips

Factors that affect price:

Gear configuration (external/internal/none)

Precision and hardness requirements

Quantity of units and project timeline

Certifications required (e.g., CCS, DNV, CE)

Typical Price Range: USD $1,200 – $12,000 per unit
Request a quote and 2D/3D CAD files at www.ldb-bearing.com.

Engineering and Support Services from LDB

LDB offers:

Bearing simulation and lifetime calculation reports

OEM interface consultation for cranes and excavators

Fast prototyping and batch delivery for heavy industry clients

Custom lubrication systems and sealing designs

All products undergo full dimensional inspection, gear mesh analysis, and torque verification before shipment.

Why LDB Is a Trusted Partner

20+ years in slewing bearing manufacturing

Exported to over 50 countries across 5 continents

In-house forging, heat treatment, CNC machining

Proven performance in construction, energy, and defense sectors

On-time delivery and technical training available globally

Installation & Maintenance Advice

Mount on a flat, rigid surface to avoid raceway deformation

Use calibrated torque wrenches for bolt tightening

Apply thread locking compound to prevent loosening

Re-grease periodically based on load and rotation frequency

Conclusion

Double row ball slewing bearings provide the extra strength and rotational consistency needed in demanding environments. Whether you’re lifting, rotating, or supporting multi-ton structures, their robust construction and dual-row advantage make them a smart investment.

LDB’s engineering-driven manufacturing and application expertise help clients reduce lifecycle costs and boost machinery performance. Choose LDB for safe, strong, and stable solutions.

Get in touch today at www.ldb-bearing.com to learn more.

Cross Roller Slewing Bearings: Precision Rotation for High-Stiffness Applications

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Cross Roller Slewing Bearing?

A cross roller slewing bearing is a type of precision rotational bearing that features cylindrical rollers arranged alternately in perpendicular (90-degree) orientations between two raceways. This crossed arrangement allows the bearing to simultaneously handle axial, radial, and moment loads while maintaining high rigidity and minimal rotational clearance.

Because of their compact structure and high rotational accuracy, cross roller slewing bearings are widely used in equipment where both precision and load-bearing capacity are critical. This includes medical imaging systems, industrial robots, radar antennas, and machine tools.

Unique Benefits of Cross Roller Slewing Bearings

High Rigidity in a Compact Form

The orthogonal roller arrangement offers significantly higher stiffness compared to ball slewing bearings, even in small spaces. This allows for precise control of rotation under load.

Accurate Positioning

Thanks to their low friction and backlash, cross roller slewing bearings provide smooth, accurate rotation—making them ideal for devices requiring high repeatability.

Combined Load Support

These bearings efficiently manage axial, radial, and tilting moment loads at the same time, reducing the need for multiple bearing sets or complex assemblies.

Space Optimization

The compact design minimizes thickness and simplifies integration in tight enclosures—critical for surgical robots or semiconductor processing machines.

Where Are Cross Roller Slewing Bearings Used?

Industry	Use Case
Medical Equipment	CT and MRI gantry rotation, surgical robots
Robotics	Joint rotation, base turntables
Aerospace	Satellite antenna positioning systems
Optical Systems	Precision lenses and telescope tracking
CNC & Machine Tools	Rotary tables, indexing systems
Military Systems	Radar dishes, missile launcher bases

LDB’s Cross Roller Slewing Bearing Solutions

As a long-standing manufacturer and global supplier, LDB offers cross roller slewing bearings engineered for high-performance applications. Our portfolio includes:

Standard cross roller slewing bearings with outer diameters from 200mm to 1500mm

Geared and non-geared configurations (internal, external, or gearless)

Split-type designs for easy maintenance in compact structures

Preloaded systems for zero-backlash motion

Stainless steel options for cleanroom and medical use

Design Highlights:

Integrated sealing rings

Ultra-smooth raceway grinding

Precision heat-treated rollers

Dual-row or tapered cross roller configurations for added capacity

LDB’s cross roller series is trusted by clients in Japan, Germany, and the US for applications where failure is not an option.

Pricing and Procurement Considerations

Price factors include:

Diameter and load rating

Gear module and accuracy grade

Coating (e.g., phosphate, black oxide, nickel-plated)

Customization of bolt holes or preload

Typical Price Range: USD $500 – $5,000 per unit (High-precision or large-diameter types may vary above this range.)

When selecting a cross roller slewing bearing, consult your manufacturer or supplier for 3D models, load-life calculations, and installation drawings.

Request your quote today via www.ldb-bearing.com.

Installation Tips

Ensure flatness and parallelism of the mounting surface

Do not apply force directly on the bearing face during installation

Use torque-controlled tightening on bolts

Apply uniform preload where applicable

Lubricate thoroughly before first use and follow re-greasing intervals

Why Choose LDB for High-Precision Bearings?

20+ years of bearing production excellence

In-house design and manufacturing for special orders

Strict quality control with full traceability

ISO 9001, CE, and medical device component certifications

Rapid response on RFQs and technical consultations

LDB’s cross roller slewing bearings meet the world’s most demanding requirements—from operating rooms to orbital satellites.

Final Thoughts

When accuracy and reliability are non-negotiable, cross roller slewing bearings are the solution. Their ability to combine precision, strength, and compact form makes them indispensable in today’s high-tech machinery.

LDB brings decades of experience and a global network to support your project from design through delivery. Let us help you build smoother, stronger, smarter motion systems.

Explore our product range or request support at www.ldb-bearing.com.