Crossed Roller Slewing Bearing Manufacturer & Custom Solutions

What is a Crossed Roller Slewing Bearing?

A crossed roller slewing bearing is a type of bearing designed to handle heavy loads; it utilizes rollers as its rolling elements, with adjacent rollers arranged in an alternating 90-degree crisscross pattern. This type of slewing bearing is capable of withstanding loads from various directions, such as:

Vertical axial loads;

Horizontal radial loads;

Overturning moments caused by off-center loading;

Shock loads during startup and shutdown;

Dynamic loads generated during rotation.

The crossed roller structure allows a single bearing to simultaneously manage these various loads, making it particularly suitable for industrial equipment that requires high rigidity and rotational stability.

Working Principle of Crossed Roller Slewing Bearings

Crossed roller slewing bearings primarily consist of an inner ring, an outer ring, raceways, rollers, a cage/spacer structure, a sealing system, and a lubrication system. Adjacent rollers are arranged in alternating directions so that one roller primarily bears a load from one direction, while the neighboring roller handles a load from another. Through this crossed arrangement, the bearing can simultaneously withstand axial loads, radial loads, and overturning moments. Bearings for large-scale equipment must not only endure extreme loads but also maintain rotational precision and stability under overturning moments.

Therefore, when selecting a crossed roller slewing bearing, it is essential to perform calculations and selection based on the specific load conditions of the entire piece of equipment.

Why Choose Crossed Roller Slewing Bearings?

1. High-Rigidity Structure

High rigidity is a key advantage of crossed roller slewing bearings.Adjacent rollers are arranged in a 90-degree crisscross pattern within the raceway, creating linear contact that offers a larger contact area compared to point-contact structures. Applications such as heavy machinery, construction equipment, industrial robots, measuring instruments, and precision rotary platforms require slewing bearings with high structural rigidity; crossed roller slewing bearings are ideally suited to these needs.

2. Simultaneous Multi-Directional Load Capacity

The crossed roller structure can simultaneously withstand axial loads, radial loads, and tilting moments—the three critical load types considered when selecting slewing bearings.

3. High Rotational Precision

Operational precision is vital for machinery requiring accurate rotational positioning. Crossed roller slewing bearings achieve this through the precise control of raceway accuracy, roller dimensions, radial clearance, preload, and installation precision.

4. Compact Structure

Within the same installation space, a well-designed crossed roller bearing offers superior overall load-carrying capacity. For equipment manufacturers, this means the rotary support function can be achieved within a limited footprint, eliminating the need for multiple independent bearings to handle loads from different directions.

5.Main Types of Crossed Roller Slewing Bearings: Non-geared crossed roller slewing bearings、External-gear crossed roller slewing bearings、Internal-gear crossed roller slewing bearings

How to Select a Crossed Roller Slewing Bearing?

1. Determine Bearing Dimensions

First, specify dimensions such as inner diameter, outer diameter, total height, mounting holes, bolt sizes, and the space available for the rotating assembly. For new equipment, providing mechanical assembly drawings or installation diagrams allows the supplier to assist with the selection process.

2. Determine Bearing Loads

Lifting equipment, rotary platforms, and construction machinery can generate significant axial and radial loads during operation.

3. Determine Rotational Speed and Duty Cycle

Rotational speed affects friction, heat generation, lubrication, and service life. Key factors to specify during selection include maximum rotational speed, start-stop frequency, and continuous operating time; these elements are crucial for determining the appropriate bearing structure.

4. Determine the Operating Environment

The operating environment influences the choice of materials, sealing, lubrication, and surface treatment. Key considerations include:

Operating temperature; exposure to dust, silt, water, seawater, or corrosive media; and the need for rust prevention. For outdoor construction machinery, port equipment, and mining machinery, sealing, corrosion protection, and lubrication maintenance are typically critical factors.

Key Applications of Cross-Roller Slewing Bearings

Industrial Rotating Equipment

Rotary platforms, positioning systems, automated machinery, industrial assembly equipment, and inspection equipment.

Robotic and Automation Equipment

Robotics and automation systems often require components capable of high-precision rotary positioning; cross-roller slewing bearings provide the high stability and precision rotation needed for such equipment.

Construction Machinery

Typical equipment includes: excavators, cranes, aerial work platforms, construction vehicles, and port machinery/material handling equipment.

How do you choose a supplier for crossed roller slewing bearings?

1. Do they possess actual manufacturing capabilities?

A supplier's manufacturing capabilities directly impact the quality of the slewing bearings. Buyers should evaluate the supplier's factory equipment, CNC machining capabilities, grinding machinery, assembly capabilities, and inspection equipment.

2. Do they offer OEM services?

OEM capabilities are crucial for equipment manufacturers. LTZC Bearings supports both OEM and ODM services, offering the ability to create designs and manufacture samples based on specific customer requirements.

3. Can they ensure stable, large-scale supply?

With over 30 years of experience in the industry, LTZC Bearings is a trusted supplier capable of consistent, high-volume delivery. We offer a 15–30 day lead time for custom slewing bearings and maintain a monthly production capacity of 700 units.

Contact LTZC bearings manufacturer

Cross Roller Slewing Bearing FAQ

What are the advantages of a cross roller slewing bearing?

Key advantages include high rigidity, excellent combined load-bearing capacity, high stability, and a compact structural design.

What loads can a cross roller slewing bearing handle?

Specific load-bearing capacity depends on bearing dimensions, roller configuration, materials, load distribution, rotational speed, and the operating environment. Selection for specific projects should be based on axial loads, radial loads, and tilting moments.

Can the bearing be customized?

Yes. LTZC can customize bearings—including dimensions, mounting holes, gear configurations, materials, precision grades, sealing, and other structural parameters—to meet specific equipment requirements.

What information should I provide for a quotation?

We recommend providing the bearing dimensions, axial load, radial load, tilting moment, rotational speed, application equipment, gear specifications, mounting dimensions, and estimated purchase quantity.

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