What is the structure of the rotary table bearing?

A rotary table bearing, often used in applications requiring precision rotation, such as machine tools and rotary tables, has a specialized structure to support and facilitate smooth rotational movement. Here is an overview of the key components and structure of a rotary table bearing.

1. Bearing Type

Rotary table bearings are typically cross-roller bearings or YRT (Yaw and Roll Table) bearings, designed to handle axial, radial, and moment loads simultaneously.

2. Components and Structure

Inner and Outer Rings:

Inner Ring: Mounted on the stationary part of the rotary table, providing the raceway for the rolling elements.

Outer Ring: Attached to the rotating part of the table, also serving as a raceway for the rolling elements.

Rolling Elements:

Cross-Roller Bearings: Use cylindrical rollers arranged perpendicular to each other in a cross pattern, which allows them to handle high axial and radial loads as well as tilting moments.

YRT Bearings: Comprise an axial needle roller and cage assembly, a radial cylindrical roller, and two axial cylindrical roller and cage assemblies, ensuring high rigidity and precision.

Cage:

Holds and guides the rolling elements, ensuring they remain evenly spaced and reducing friction.

Seals:

Installed on both sides of the bearing to prevent contamination and retain lubrication, enhancing the bearing’s lifespan and performance.

Preload Adjustment:

Many rotary table bearings come with a mechanism to adjust preload, ensuring optimal stiffness and minimizing deflection during operation.

3. Design Features

High Precision: Designed to maintain accurate positioning with minimal deflection, crucial for precision applications like CNC machines and indexing tables.

High Load Capacity: Capable of supporting heavy axial, radial, and moment loads due to the robust design and high number of rolling elements.

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