Single Row Four Point Contact Ball Bearings

Introduction to single-row four-point contact ball bearings

Single-row four-point contact ball bearings are a common rotating support element, characterized by a four-point contact structure between the inner and outer ring raceways and a single row of steel balls. This design enables it to withstand radial, axial and overturning moments at the same time, and has a compact design, high load capacity and excellent rotation performance, so it is widely used in a variety of equipment that requires support and rotation.

Common models and parameter list

Single-row four-point contact ball bearing models are classified according to size, load capacity and specific application scenarios. The following are some typical models and their parameters for reference:

Model Inner diameter (mm) Outer diameter (mm) Height (mm) Dynamic load (kN) Static load (kN) Limiting speed (rpm)

• QJ204 20 47 14 12.5 6.8 9000
• QJ206 30 62 16 19.5 10.5 7500
• QJ208 40 80 18 28.5 15.5 6300
• QJ210 50 90 20 35.0 19.0 5600
• QJ212 60 110 22 45.0 25.0 4800
• QJ215 75 130 25 60.0 35.0 4000
• QJ218 90 160 30 85.0 50.0 3400
• QJ220 100 180 34 100.0 60.0 3000

Note: The data is for reference only. The specific parameters need to be confirmed according to different manufacturers or design specifications.

Analysis of typical application fields

Due to its compact structure, strong load-bearing capacity and flexible operation, single-row four-point contact ball bearings are widely used in the following industries:

Engineering machinery

• Application scenarios: excavators, cranes, concrete pump trucks, etc.
• Function: Support rotating platforms and withstand complex mechanical loads.
• Features: Simple design, quick installation, and can meet high load requirements.

Wind power generation equipment

• Application scenarios: Yaw system of wind turbines.
• Function: Support tower rotation and resist wind and overturning loads.
• Features: High long-term operating reliability, suitable for harsh working conditions.

Medical equipment

• Application scenarios: CT scanners, X-ray machines, etc.
• Function: Provide rotation support to ensure accurate positioning.
• Features: Low noise, high precision, suitable for medical environment needs.

Industrial robots

• Application scenarios: Robot joints, rotation modules.
• Function: Achieve high-precision rotation and positioning.
• Features: Small footprint, strong flexibility.

Defense equipment

• Application scenarios: Radar antennas, missile launchers, etc.
• Function: Support rotating structures and adapt to complex mechanical conditions.
• Features: High load capacity, suitable for extreme environments.

Summary

Single-row four-point contact ball bearings are a comprehensive performance bearing with the following advantages:

1. Compact structural design: Single-row steel ball layout, small footprint.
2. High load capacity: Can withstand multiple mechanical loads at the same time.
3. Excellent running performance: Low friction, suitable for high-speed operation.
4. Wide range of applications: Engineering machinery, wind power equipment, medical instruments, robots and military equipment.

When selecting such Slewing ring bearings, the actual working environment, load requirements and precision requirements should be considered comprehensively to ensure that they meet the performance and life requirements of equipment operation.