ISO 12167-2:2021

Overview - ISO 12167-2:2021 (Hydrostatic plain journal bearings, drainage grooves)

ISO 12167-2:2021 specifies characteristic values in graphic form used for the calculation and preliminary design of oil‑lubricated hydrostatic plain journal bearings with drainage grooves under steady‑state conditions. Published as Part 2 of the ISO 12167 series, this second edition complements ISO 12167‑1 by providing diagrams, Table 1 and Figures 1–13 that supply designers with standardised data for hydrostatic plain journal bearings, including load and power characteristics for bearings with recesses and grooves.

Key topics and technical requirements

• Scope and basis: Values are intended for oil‑lubricated, hydrostatic plain journal bearings with drainage grooves; steady‑state, isothermal analysis is used as a first‑order approach (see Introduction).
• Graphic characteristic values: Diagrams and Table 1 provide values such as load‑carrying capacity (F*), attitude angle (β), total power (Ptot), and minimum recess pressure (Pmin) for a range of geometry and operating parameters.
• Typical parameters covered: Relative eccentricity (ε), land and recess dimensions (l/B, l/D, b/D), number of recesses (Z), resistance ratio (κ), speed‑dependent parameter (K), relative frictional pressure (π) and normalized pressure/load factors (P*, ξ). Table 1 lists characteristic values for an example “optimized bearing” parameter set (e.g., ε = 0.4; h = 40·C; α = 0; b/D = 0.05; P* = 2; l/B = 0.1; ξ = 1).
• Design context: Values are to be used in calculations in accordance with ISO 12167‑1. Explanations of symbols and worked calculation examples are covered in Part 1.
• Limitations: This part provides standardised characteristic values and diagrams; it does not replace detailed, modern numerical analyses (e.g., non‑isothermal, transient CFD/thermo‑hydrodynamic studies) when those are required.

Applications and who uses it

• Bearing designers and mechanical engineers: For preliminary sizing, selection and optimization of hydrostatic plain journal bearings with drainage grooves.
• Rotating equipment manufacturers: To standardise bearing design choices, estimate load capacity and power loss and ensure compatibility with ISO 12167‑1 calculation methods.
• Tribologists and maintenance engineers: For assessment of recess geometry effects, expected attitude angles and minimum recess pressures under steady operation.
• Industry sectors: Power generation, turbomachinery, heavy machinery, gearboxes and any application that uses oil‑lubricated hydrostatic plain bearings.

Related standards

• ISO 12167‑1 - Calculation of oil‑lubricated plain journal bearings with drainage grooves (normative companion referenced throughout Part 2).
• ISO 12167 series and work by ISO/TC 123 (Plain bearings) for broader plain bearing standards and calculation methods.

Keywords: ISO 12167-2, hydrostatic plain journal bearings, drainage grooves, characteristic values, oil‑lubricated bearings, bearing calculation, load‑carrying capacity, Ptot, eccentricity, bearing design.