ISO 12168-2:2019

Overview

ISO 12168-2:2019 is an international standard developed by ISO for plain bearings, specifically focusing on hydrostatic plain journal bearings without drainage grooves under steady-state conditions. This part (Part 2) presents characteristic values required for the calculation of oil-lubricated plain journal bearings without drainage grooves. The document provides these characteristic values in graphic form, serving as a vital reference for bearing designers and engineers when calculating, optimizing, or assessing the performance of oil-lubricated hydrostatic plain journal bearings.

Key Topics

• Characteristic Values in Bearing Calculation
  This standard illustrates critical bearing parameters such as load-carrying capacity, relative eccentricity, attitude angle, power consumption, and resistance ratio using graphs and tables. These values are essential for:

  • Determining operating performance of hydrostatic plain journal bearings
  • Designing optimized bearings without drainage grooves
  • Assessing bearing behavior under steady-state, oil-lubricated conditions

• Graphic Presentation of Data
  The document contains numerous figures (Figures 1-19) and a summary table listing characteristic values, which can be referenced directly in engineering design and calculation processes.

• Boundary Conditions and Usage
  The characteristic values are based on the premises and boundary conditions specified in ISO 12168-1. Explanations of calculation symbols and methods, as well as practical calculation examples, can be found in Part 1 of ISO 12168.

Applications

ISO 12168-2:2019 is highly relevant in sectors and engineering contexts where oil-lubricated hydrostatic plain journal bearings without drainage grooves are utilized. Typical applications include:

• Industrial Machinery and Equipment

  • Machine tools spindles
  • Pumps and compressors
  • Large rotating equipment where precise bearing operation is required

• Mechanical Design and Engineering

  • Calculation and optimization of bearing dimensions and performance
  • Selection of bearing configurations for optimal load capacity and efficiency

• Maintenance and Performance Assessment

  • Evaluating existing installations for compliance and performance optimization
  • Troubleshooting and improving bearing life and reliability

The use of standard characteristic values enables engineers to make informed decisions about bearing selection, ensuring reliability, consistency, and efficiency in design and operation.

Related Standards

• ISO 12168-1:
  Plain bearings - Hydrostatic plain journal bearings without drainage grooves under steady-state conditions - Part 1: Calculation of oil-lubricated plain journal bearings without drainage grooves
  Provides foundational calculation methods and boundary conditions essential for using the characteristic values in Part 2.

• Other ISO Standards for Plain Bearings:

  • ISO 4378: Plain bearings - Terms, definitions, classification, characteristics and symbols
  • ISO 3548: Plain bearings - Thin-walled half bearings

• Relevant Industry References:
  The standard’s bibliography cites important research supporting characteristic value development and bearing design, helping users find additional technical background.

Practical Value

The use of ISO 12168-2:2019 ensures data-driven calculation and design of oil-lubricated hydrostatic plain journal bearings without drainage grooves. By referencing standardized characteristic values and graphical data, engineers and designers can:

• Enhance bearing performance and reliability
• Expedite the design process using verified reference data
• Ensure compliance with internationally recognized standards
• Achieve consistent product quality in mechanical assemblies

For organizations involved in the manufacturing, selection, or maintenance of plain bearings, adhering to ISO 12168-2:2019 supports safe, reliable, and cost-effective operation of critical rotating equipment.