External-tooth cross-roller slewing bearing

External-tooth cross-roller slewing bearings are complex mechanical components used to support and rotate large structures, such as lifting equipment, rotary platforms, construction machinery, and other applications requiring high load capacity and rotational freedom.

Main structural features of external-tooth cross-roller slewing bearings:

External-tooth cross-roller slewing bearings are complex mechanical components used to support and rotate large structures, such as lifting equipment, rotary platforms, construction machinery, and other applications requiring high load capacity and rotational freedom.

Outer Gear Ring: One of the defining features of an outer‑gear‑type cross‑roller slewing bearing is its outer gear ring, which typically consists of a gear‑rack structure. The primary function of the outer gear ring is to interface with an external drive system—such as an electric motor, hydraulic system, or gearbox—to enable the bearing’s rotation. The rack teeth on the outer gear ring are usually matched to the corresponding components of the drive mechanism.

Inner ring: The inner ring is located inside the outer gear ring and typically consists of two interconnected half-rings. The gap between these half-rings allows the bearing to rotate.

Rolling elements: Between the inner and outer rings, cross‑arranged rolling elements—typically rollers—are provided. This arrangement enables the bearing to withstand high radial and axial loads while minimizing friction and wear.

Sealing Device: External-tooth cross-roller slewing bearings are typically equipped with sealing devices to protect the bearing interior from contaminants and moisture. These seals help extend the bearing’s service life.

Connection Structure: The inner and outer rings of an external-tooth-type cross-roller slewing bearing are typically securely joined by a connection structure—such as bolts or a retaining clamp—to ensure the bearing’s overall stability.

Reinforced Structure of the Inner and Outer Rings: As these bearings are typically used in large-scale machinery and equipment, their inner and outer rings are often reinforced and engineered to meet stringent requirements for high load capacity and durability.

Free Rotation: The design of the external-tooth cross-roller slewing bearing enables continuous 360-degree free rotation without the need for additional drive mechanisms. This free-rotation capability is particularly advantageous in applications requiring omnidirectional rotation.

In summary, the structural characteristics of external‑tooth cross‑roller slewing bearings make them an ideal choice for supporting the rotation of large structures and withstanding heavy loads. Their sophisticated yet highly efficient design ensures widespread use across a variety of engineering and mechanical applications, thereby guaranteeing the stability and controllability of large‑scale equipment and machinery systems.

Product Specifications