What is the load capacity of trailer turntable bearings?

The load capacity of trailer turntable bearings can vary significantly based on the specific type, size, and design of the bearing, as well as the application's operating conditions. Manufacturers typically provide a range of load capacities, often expressed as an axial load in kN (kilonewtons) or tons. For example, some models of turntable bearings are designed for axle loads ranging from 7.5 to 250 kN (approximately 0.76 to 25.5 metric tons).

Factors Influencing Load Capacity

Several factors affect the actual load capacity of a turntable bearing:

Bearing Type and Design:

Ball bearings: These are suitable for lighter loads and agricultural vehicles, offering smooth rotation.

Roller bearings: These are used for heavier-duty applications and offer a much higher load capacity and durability.

Double-row bearings: These are designed to provide both precision and strength, handling a combination of axial, radial, and moment loads.

Operating Speed: The load capacity is inversely related to speed. For example, a bearing's load capacity may increase by up to 40% at speeds below 25 km/h compared to its rated capacity at higher speeds. Conversely, load capacity may decrease at speeds above 25 km/h.

Application and Usage:

Road conditions: The capacity is typically rated for paved, standard road conditions.

Trailer type: The load capacity can be influenced by the type of trailer, such as two-axle full trailers, which may allow for a 10% increase in the specified axial load.

Mounting and Lubrication: Proper installation and maintenance, including correct lubrication, are critical to achieving the rated load capacity and ensuring the bearing's longevity.

Determining the Right Bearing

When selecting a turntable bearing, it's crucial to consider the following:

Axial Load: The vertical force exerted on the bearing. This is the primary load a turntable bearing is designed to handle.

Radial Load: The force acting perpendicular to the bearing's axis.

Tilting Moment Load: The force that creates a bending moment, causing the bearing to tilt.

Always refer to the manufacturer's specifications and technical documentation for the exact load ratings of a specific bearing model.