Double Row Ball Slewing Bearing (02 Series) for Excavator and Crawler Crane

Double Row Ball Slewing Bearing for Excavator and Crawler Crane

A double row ball slewing bearing is a critical component used in excavators and crawler cranes, designed to support axial, radial, and tilting moment loads simultaneously. This type of bearing features two rows of rolling elements, typically balls, which are arranged in a way that they can manage the complex load combinations experienced in heavy machinery applications.

These bearings are integral to the rotational function of the equipment, allowing the upper structure of the machine to rotate smoothly and efficiently around its base. The design of a double row ball slewing bearing includes an inner ring and an outer ring, with mounting holes that facilitate easy attachment to the machine. The space between the rings is filled with rolling elements and separators, ensuring even load distribution and reduced friction.

Double row configurations provide higher load capacities and increased stability compared to single row designs, making them ideal for heavy-duty tasks. Their robust construction ensures durability and reliability, essential for the demanding environments in which excavators and crawler cranes operate. Proper lubrication and maintenance are crucial to extend the lifespan of these bearings and ensure optimal performance.

Double Row Ball Slewing Bearing (02 Series) Parameters

Note：

1. N1 is the number of lubricating oil holes. Oil cup M10 * 1 GB1152~1153-79.

2. Mounting holes n - Φ can convert screw holes; The tooth width b can be changed to H- H.

3. The internal gear is the maximum circle force, and the rated circumference force is 1/2.

4. The coefficient of external tooth repair is 0.1, and the internal tooth repair coefficient is 0.2.

Double-row Ball Slewing Ring Design Features

Double row ball slewing bearings offer a range of key features that make them highly suitable for demanding applications in machinery such as excavators and crawler cranes. Some of the key features of double row ball slewing bearings include:

1. Dual Ball Rows: Double row ball slewing bearings feature two distinct rows of balls. This configuration enhances load capacity and stability, allowing the bearing to handle higher axial and radial loads as well as tilting moments. The dual rows distribute loads more evenly, reducing stress concentrations and extending the bearing's operational lifespan.
2. Separated Raceways: The inner and outer rings of the bearing have separated raceways for each row of balls. This separation ensures that each row can independently accommodate loads, improving the bearing's ability to manage complex load combinations. This design feature contributes to the bearing's precision and smooth rotational capabilities.
3. Robust Construction: Made from high-quality steel or other durable materials, these bearings are built to withstand harsh environmental conditions and heavy-duty operations. The robust construction not only enhances the bearing's strength but also increases its resistance to wear and tear, making it suitable for demanding applications like excavators and cranes.
4. Integrated Seals: Double row ball slewing bearings often include integrated seals that protect the internal components from contaminants such as dust, dirt, and moisture. These seals are crucial for maintaining lubrication inside the bearing, reducing friction and preventing corrosion, which helps ensure long-term reliability and performance.
5. Mounting Holes: The design includes a series of mounting holes on both the inner and outer rings, facilitating secure attachment to the machinery. These holes allow for easy installation and alignment, ensuring the bearing is correctly positioned to handle the loads it will encounter during operation.
6. High Load Capacity: Thanks to the double row configuration, these bearings can support substantial loads. The design allows for greater distribution of forces, enabling them to handle not only higher axial and radial loads but also significant tilting moments. This makes them ideal for applications requiring both strength and stability.
7. Customizable Options: Manufacturers often offer customizable options for double row ball slewing bearings, such as specific materials, sizes, and additional features like gear teeth on the inner or outer rings. Customization allows the bearings to be tailored to specific operational needs, enhancing their effectiveness and efficiency in various applications.

Typical Applications of Double-row Ball Slewing Ring Bearing

Double row ball slewing bearings find a wide range of applications across various industries due to their ability to handle heavy loads, provide smooth rotation, and offer high precision. Some typical applications of double row ball slewing bearings include:

• Excavators: In excavators, double row ball slewing bearings are crucial for the rotation of the upper structure. They provide the necessary support for the boom, cab, and other components, allowing smooth and precise movement. The bearing's ability to handle heavy loads and complex motions makes it ideal for digging and lifting operations.
• Crawler Cranes: Double row ball slewing bearings in crawler cranes enable the rotation of the crane's superstructure. This capability is essential for maneuvering heavy loads with accuracy and stability. The robust design of these bearings ensures they can withstand the dynamic and static loads typical in construction and heavy lifting tasks.
• Port Machinery: In port machinery, such as container cranes, these bearings facilitate the rotation and movement needed for loading and unloading operations. Their high load capacity and reliability are critical for handling the substantial weights of shipping containers, ensuring efficient and safe port activities.
• Truck Cranes: For truck cranes, double row ball slewing bearings allow the crane to rotate while maintaining stability and load balance. This feature is vital for mobile lifting tasks, where precision and safety are paramount. The bearings support the crane's arm and boom, enabling it to perform a variety of lifting operations efficiently.
• Turntables: Used in various industrial applications, turntables equipped with double row ball slewing bearings can rotate smoothly under heavy loads. This is essential for processes that require precise positioning and movement, such as in manufacturing and assembly lines, where materials or components need to be accurately oriented.
• Rotating Platforms: In rotating platforms, these bearings provide the necessary support for smooth and controlled rotation. They are used in applications like amusement rides, theater stages, and other systems requiring reliable and continuous movement. The bearings' ability to handle diverse load combinations ensures stability and safety during operation.

Installation Requirements for the Double Row Slewing Bearings

The installation of double row slewing bearings, crucial components in heavy machinery like excavators and crawler cranes, is a critical process that requires precision and attention to detail to ensure optimal performance and longevity. Here are some key installation requirements for double row slewing bearings:

• Ensure Cleanliness: Before installation, it's crucial to ensure that the mounting surfaces and mating components are thoroughly clean. Any debris, dirt, or contaminants can interfere with the bearing's operation, potentially leading to uneven load distribution and increased wear. A clean environment helps maintain the bearing's integrity and performance over time.
• Proper Alignment: Achieving accurate alignment of the double row slewing bearing with its mating components is essential. Misalignment can create uneven stress distribution across the bearing, leading to premature wear and potentially catastrophic failure. Careful alignment ensures that the bearing operates smoothly and with maximum efficiency, extending its service life.
• Torque Specifications: Adhering to the manufacturer's recommended torque specifications for the mounting bolts is vital. Over-tightening can introduce excessive preload, which may damage the bearing, while under-tightening can result in looseness and misalignment. Proper torque ensures secure attachment and optimal performance under various load conditions.
• Lubrication: Proper lubrication is key during installation. The correct type and amount of lubricant, as specified by the manufacturer, should be applied to the bearing surfaces. This helps reduce friction and wear, and effectively dissipates heat generated during operation, enhancing the longevity and reliability of the bearing.
• Bearing Orientation: During installation, it’s important to ensure the correct orientation of the bearing. The bearing should be installed according to the design specifications and application requirements. Incorrect orientation can affect load distribution and operational efficiency, potentially leading to performance issues or mechanical failure.
• Bolt Tightening Sequence: Follow a proper bolt tightening sequence, usually a cross-pattern, to ensure even distribution of pressure across the bearing. This method helps prevent distortion or uneven stress, which can compromise the bearing's performance and lifespan. Consistent and balanced tightening ensures the bearing remains securely in place.

Why Choose HZPT's Slewing Bearings? 

By choosing HZPT slewing bearings, you will have a business partner who is willing to understand your application conditions to ensure that you have the rotating parts you need to complete your project on time and within budget. The use of HZPT slewing bearing will have the following advantages:

1. Faster Quotations: Our pre-sales team takes timeliness very seriously, so we will respond to quotation requests within 12 hours.
2. Greater Flexibility: it would be great if one of our standard products could meet your selection needs. If not, please don’t be disappointed, we can meet your custom requirements. We will not destroy your original design, but will customize the slewing bearings to meet your requirements.
3. More Efficient: All HZPT slewing bearings, slewing drives and gears are manufactured and designed in China with ISO, SGS and BV certifications. Three modern workshops and five specialized production lines enable us to deliver products faster and at lower prices than existing slewing support suppliers without compromising quality.
4. Rest assured: Your entire product may not work properly until the slewing supports arrive. As a result, delays in the delivery of slewing support orders are frustrating and unacceptable. HZPT logistics team to understand your demand for delivery on time, commitment to customer delivery, we will go all out not to lose faith in customers, because integrity is more important than orders.
5. Cost-Efficient: Many mainframe manufacturers have large stock reserves to ensure the complete machine production schedule. This is where a lot of your costs are tied up. With HZPT Slewing Bearings, you can save inventory and order what you need when you need it. If you wish, HZPT will follow the predetermined inventory plan to ensure that you receive the planned shipment during the year. This proven business model enables you to reduce or eliminate excess internal inventory and save money on your budget.

FAQs:

Q: How does a double row slewing bearing differ from a single row slewing bearing?

A: A ball bearing swing differs from a single row slewing bearing in terms of its structure and load-carrying capacity. Here are the key differences between the two: Structure: A single row slewing bearing consists of a single row of rolling elements (typically balls or rollers) placed between two rings. In contrast, a double row slewing bearing has two rows of rolling elements, with each row positioned between two rings. This arrangement provides increased load-carrying capacity and improved stability.

Load Capacity: Due to the presence of two rows of rolling elements, a double ball bearing turntable can handle significantly higher axial, radial, and moment loads compared to a single row slewing bearing. The additional row of rolling elements distributes the load more evenly, resulting in enhanced load-bearing capabilities.

Stiffness and Stability: The double row configuration improves the stiffness and stability of the slewing bearing. It offers increased resistance to deformation and deflection under heavy loads.

Q: Can double row slewing bearings be customized for specific applications?

A: Yes, double row ball slewing bearing can be customized to meet specific application requirements. Customization allows for the adaptation of the bearing's design, size, load capacity, sealing options, lubrication, and other features to suit the unique needs of different industries and applications.

Q: How do I determine the appropriate size of a double row slewing bearing for my application?

A: Load Requirements: Determine the maximum axial, radial, and moment loads that the slewing bearing will need to support in your application. This includes both static and dynamic loads. It's crucial to accurately calculate the loads to ensure the bearing can handle the anticipated forces.

Operating Conditions: Consider the operating conditions such as speed, temperature, and environmental factors. Higher speeds or extreme temperatures may require special considerations in bearing selection.

Mounting Space: Evaluate the available space for installing the slewing bearing. Consider the outer diameter, inner diameter, and overall dimensions of the bearing to ensure it fits within the designated area.

Bearing Geometry: Heavy duty ball bearing turntable comes in various geometries and designs. Evaluate the specific geometry options available and choose one that best suits your application requirements.

Q: What are the recommended maintenance practices for double row slewing bearings?

A: Regular Inspections: Conduct regular visual inspections of the double row slewing bearing to check for signs of wear, damage, or corrosion. Look for abnormal noise, vibration, or temperature changes that may indicate potential issues.

Lubrication Maintenance: Monitor the lubrication condition and replenish or replace the lubricant as needed. Ensure the lubrication intervals and quantities are in accordance with the manufacturer's recommendations.

Seal Integrity: Check the seals and gaskets regularly to ensure ball bearing swing is intact and provide effective protection against contaminants. Replace any damaged or worn seals promptly

Load Distribution: Periodically inspect the mounting bolts and connections to ensure they remain tight and secure. Uneven loading or loose connections can lead to stress concentration and premature failure.

Environmental Considerations: If the double row ball slewing bearing operates in harsh or extreme environments, take additional precautions. For example, in corrosive environments, consider using corrosion-resistant coatings or materials and implement appropriate sealing measures.