20tac Ball Screw Support Bearings 20tac47bsuc10pn7b Angular Contact Ball Bearing 20tac47 20X47X15mm

Ball screw support bearings, more accurately known as Ball Screw Support Units or Fixed/Flanged Support Blocks, are specialized bearing units designed to securely support and accurately align the ends of a ball screw. Their primary function is to provide extremely rigid and precise axial positioning for the ball screw shaft while allowing for smooth rotational motion.

A ball screw assembly converts rotary motion into precise linear motion. The support bearings are critical because they:

1. Absorb Axial Loads: They are designed to handle the high thrust (axial) loads generated during operation.

2. Provide Rigid Support: They prevent deflection of the ball screw under load, ensuring positional accuracy.

3. Ensure Precise Alignment: They maintain perfect alignment between the ball screw and the drive motor, preventing binding and ensuring efficient power transmission.

4. Simplify Installation: They come as a pre-assembled, pre-adjusted unit, drastically simplifying mounting and alignment compared to assembling individual components.

The core component inside these support units is almost always a Matched-Pair Angular Contact Thrust Ball Bearing. These bearings are mounted in a specific configuration (usually Back-to-Back (DB) or Face-to-Face (DF)) and are pre-loaded to eliminate axial and radial play, resulting in high rigidity and exceptional rotational accuracy.

Common Bearing Types & Configurations Inside Support Units:

1. Matched-Pair Angular Contact Bearings (60° Contact Angle):

   • This is the most common and standard type. The 60° contact angle is optimized for handling very high thrust loads.

2. Matched-Pair Angular Contact Bearings (30° / 40° Contact Angle):

   • Used in applications requiring higher rotational speeds or where radial loads are more present alongside thrust loads.

3. Pre-Load Classes: The internal bearings are pre-loaded to eliminate all clearance.

   • Light Preload (L): For high-speed applications with moderate loads.

   • Medium Preload (M): The most common standard for general CNC and automation.

   • Heavy Preload (H): For applications where maximum rigidity and minimal deflection are critical, such as in heavy machining centers.