How to choose the right slewing bearing？

Slewing bearings Introduction

Slewing bearings, also known as turntable bearings or rotary bearings, are large-diameter bearings designed to accommodate the axial, radial, and moment loads that occur during slow oscillating or rotating movements. They are commonly used in a wide array of applications such as construction machinery, wind turbines, cranes, and satellite antennas due to their capacity to support heavy loads while enabling smooth rotation.

Key features of slewing bearings include:

• Load capacity: Slewing bearings are capable of handling combined axial, radial, and moment loads, making them suitable for heavy-duty applications and complex loading scenarios.

• Compact design: Slewing bearings' inherently compact structure enables efficient use of space, reducing the overall size and weight of machinery and equipment.

• Gear integration: Slewing bearings can be integrated with internal or external gearing, or designed with no gears, depending on the application requirements. This integration simplifies the drive system and optimizes load transmission.

• Long service life and low maintenance: With proper care and lubrication, slewing bearings can offer a long service life and require minimal maintenance, resulting in reduced downtime and operational costs.

• Versatility: Slewing bearings are available in various configurations, such as single-row or double-row ball bearings and roller bearings, enabling customization to meet the specific needs of each application.

• High rigidity: The robust construction of slewing bearings provides high rigidity and excellent stability, ensuring reliable operation even under extreme conditions.

By offering these unique characteristics, slewing bearings play a vital role in the functionality and performance of numerous heavy-duty and precise rotary applications.

Parameter in selecting slewing bearings

Selecting the appropriate slewing bearing for a specific application requires careful consideration of several parameters to ensure optimal performance, reliability, and durability. Here are some of the key factors to consider when selecting a slewing bearing:

• Load capacity: Evaluate the anticipated axial, radial, and moment loads that the slewing bearing will encounter during operations. Make sure to select a bearing that can handle these loads without failure or excessive wear.

• Size restrictions: Consider the space available for the slewing bearing and choose one that fits within the given dimensions without compromising the system's functionality.

• Rotational speed: Determine the required rotational speed (RPM) for your application and select a slewing bearing that is suitable for that speed.

• Operating environment: Consider the environmental conditions in which the slewing bearing will operate, such as temperature, humidity, and exposure to chemicals or contaminants. Choose materials and seals that can withstand these conditions.

• Service life: Determine the desired service life of the slewing bearing, taking into account factors such as load, speed, maintenance, and lubrication. Select a bearing that can achieve this service life under the given operating conditions.

• Gear type: Selecting the appropriate gear type (internal, external, or without gear) depends on the requirements of the application, space constraints, and desired torque transmission.

• Lubrication and maintenance: Consider the appropriate lubrication type and maintenance requirements for the slewing bearing. Inaccessible locations may require self-lubricating or low-maintenance designs.

• Mounting: Consider the mounting methods and associated equipment necessary for secure and appropriate installation, such as bolts, plates, and fasteners.

• Precision: Determine the desired precision level or accuracy of the slewing bearing's movement. High precision applications may require customized solutions or specialized bearing designs.

• Budget and cost: Select a slewing bearing that fits within the project budget without sacrificing quality, reliability, or performance. Consider factors such as acquisition cost, maintenance, and potential downtime when assessing the overall cost.

By carefully evaluating these parameters, you can select the most suitable slewing bearing for your specific application, ensuring optimal performance, reliability, and longevity.

Choosing the right slewing bearings first requires consideration of load capacity

Although the correct selection of slewing bearings depends on several factors such as load, hardness, speed, size, and rotational flexibility, the primary consideration is the normal load capacity. As a professional slewing bearing manufacturer, LTZC Bearing believes that collaboration between clients and manufacturers in choosing the right structure can help optimize system performance and achieve flawless operation at the lowest cost. LTZC Bearing offers the following recommendations to help you accurately select the appropriate slewing bearing solution for your needs:

• For applications with significant torque requirements, double-row four-point contact ball bearings are generally recommended.

• Roller bearings are typically used to enhance rigidity.

• To maximize load capacity, opt for crossed roller bearings, either in two-row or three-row configurations.

• Large-size bearings are needed for applications that require increased rigidity and load capacity. On the other hand, for sensitive applications such as robotic and control devices, smaller-size bearings are preferred. Slewing bearings with smaller diameters are lightweight and offer higher rotation speeds, adapting to the required structural deformation accordingly.

By considering these factors, you can select the most suitable slewing bearing that meets your application requirements and provides optimal performance.