YRT80 Axial-Radial Bearing (Roatry table Bearing)

The YRT80 is a high-precision, combined axial-radial bearing (commonly referred to as a turntable bearing or rotary table bearing) manufactured to DIN 616 / ISO 104 standards. It is specifically engineered to accommodate simultaneous axial loads, radial loads, and tilting moments with extremely high running accuracy and rigidity.

This bearing type is the industry standard for applications requiring precise rotary motion, particularly in machine tools and measurement equipment.

1. Design and Construction
The YRT80 features a unique integrated design consisting of several key components:
– Solid Bearing Rings: An inner ring and an outer ring made from bearing steel.
– Two Row Cylindrical Roller Arrangements: It contains two independent sets of rollers. One set is arranged axially (90-degree contact) to handle thrust loads in both directions, while the other set is arranged radially to guide the rotation and handle radial forces.
– High-Precision Cage: Made from brass or polyamide, it ensures even roller spacing and reduces friction.
– Pre-Drilled Mounting Holes: A defining feature of the YRT series. Both the inner and outer rings come with evenly distributed through-holes or threaded bores. This allows for direct bolt fixation to machine interfaces without the need for complex clamping or additional retaining rings, simplifying installation and ensuring a rigid connection.

2. Technical Specifications (YRT80)
The specific dimensions and load ratings for the YRT80 are standardized:
– Bore Diameter (d): 80 mm
– Outer Diameter (D): 146 mm
– Height (H): 35 mm
– Load Ratings (Approximate):
– Axial load rating (dynamic/static): High bidirectional capacity (typically in the range of 50–100 kN depending on direction).
– Radial load rating: Moderate radial capacity.
– Precision: Typically manufactured to P4 or P2 running accuracy, ensuring minimal radial runout and axial runout.

3. Key Features
– High Running Accuracy: The YRT80 ensures extremely low runout tolerances, making it suitable for tasks where concentricity and perpendicularity are critical.
– High Rigidity: Due to the preload generated by the axial roller arrangement and the robust ring design, the bearing exhibits very low elastic deformation under load.
– Combined Load Capability: It can simultaneously support heavy axial loads (in both directions), radial forces, and tilting moments from a single, compact unit.
– Ease of Mounting: The integrated mounting holes eliminate the need for auxiliary locking elements, allowing for a simplified and highly rigid bolt-on connection.

4. Common Applications
The performance characteristics of the YRT80 make it ideal for:
– Rotary Tables: The primary application for milling, grinding, and EDM rotary tables.
– Indexing Tables: For precise positioning in automation and assembly lines.
– Direct Drives: Integration with torque motors in high-speed, high-precision rotary axes.
– Antenna and Radar Systems: Where precise azimuth positioning is required.
– Medical Technology: In CT scanners or other large rotating gantries.

5. Installation Guidelines
To achieve the specified performance from a YRT80 bearing:
1. Surface Preparation: The mating surfaces on the housing and shaft must be machined to a high degree of flatness and perpendicularity to avoid distortion.
2. Bolt Fixation: Use high-strength bolts (usually property class 10.9 or 12.9) tightened to the specified torque to ensure the bearing rings are securely clamped.
3. Lubrication: The bearing is typically supplied with a high-quality grease suitable for a wide temperature range. Regular relubrication is required based on duty cycle.

The YRT80 is a high-performance, ready-to-mount unit that combines the functions of an axial bearing, a radial bearing, and a moment bearing into one compact, precise, and rigid package. Its standardized dimensions and bolt-fixing design make it the preferred choice for engineers building precision rotary axes in machine tools and industrial automation.