The ZR3 series is a heavy-duty triple-row roller slewing bearing with integrated internal gear structure, specially engineered for ultra-high load industrial rotary systems. Differing from ball-type and double-row slewing units, this series adopts a professional three-row roller layout and concealed internal tooth design, focusing on extreme structural rigidity, heavy-load resistance and high-precision transmission stability. It is the preferred core component for large engineering machinery and heavy rotary equipment that require long-term stable operation under ultimate load conditions.
Large tower cranes and mobile cranes
Heavy-duty excavators and mining equipment
Wind turbine yaw and pitch systems
Large radar and antenna positioning systems
Heavy-duty industrial turntables
Marine cranes and offshore equipment



| Inquiry | Type | Drawing No. | Brand | Dimensions | Holes | Gear | Weight [KGS] | ||||||||||||||
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| De[mm] | de[mm] | di[mm] | Di[mm] | He[mm] | Hi[mm] | Ht[mm] | Fe[mm] | Fi[mm] | N | V[mm] | m | z | xm | DP | fz norm[kN] | fz max[kN] | |||||
Featuring a unique triple-row roller structural configuration, the series achieves industry-leading composite load performance. Separately arranged vertical and horizontal roller rows undertake classified loads, independently bearing huge axial forces, radial forces and extreme overturning moments. This graded load-bearing design completely avoids load superposition and local stress saturation, effectively suppressing structural deformation and mechanical fatigue under long-term heavy-load cyclic operation. Compared with traditional ball bearings and double-row roller bearings, it delivers far higher rigidity, impact resistance and operational stability for heavy-duty working scenarios.
Equipped with precision internal involute gears, the bearing integrates driving and load-bearing functions in a compact integrated structure. The internal gear layout protects tooth profiles from external collision, abrasion and environmental erosion, greatly improving transmission durability. All gear teeth undergo fine finishing and strict heat treatment processes, achieving low backlash, high meshing accuracy and consistent torque output. The internal gear matching method optimizes equipment space layout, simplifies transmission assembly and enhances the overall safety and integration of heavy machinery systems.

