Overview - ISO 12132:2017 (Design FMEA for thin-walled half bearings)
ISO 12132:2017 provides guidance for preparing a Design FMEA specifically for thin-walled half bearings used in machinery (for example, internal combustion engines). The standard lists common potential failure modes, their effects and likely causes, and emphasizes system-level interactions (lubrication, crankshaft, engine block, connecting rods, etc.). It does not include numeric risk ratings (occurrence, severity, detection) because these are application- and customer-specific. Process FMEA remains the supplier’s responsibility. IEC 60812 and ISO 7146 series are referenced for methods and damage characterization.
Key topics and technical focus
- Purpose: Guidance for performing a Design FMEA for plain bearing design and quality assurance.
- FMEA elements: failure mode, failure effect, failure cause - organized for half bearing shells.
- Common failure modes documented (table-based):
- Fatigue (reduced durability, seizure)
- Accelerated wear (insufficient oil film, embeddability issues)
- Scuffing/over‑heating (excessive clearance, poor running-in)
- Excessive localized wear (features like grooves, holes affecting pressure)
- Bearing back damage (interference-fit and housing issues)
- Corrosion (lubricant, coolant, fuel contamination)
- Cavitation erosion (overlay and groove-related problems)
- Typical causes cited: material selection, journal/housing geometry, improper clearances, inadequate lubrication or filtration, oil supply design, housing stiffness and alignment, thermal expansion, contamination.
- Methodology note: Numerical risk scoring is to be determined by the designer/manufacturer per IEC 60812 and company/customer criteria.
Practical applications and users
Who uses ISO 12132:2017:
- Design engineers and mechanical engineers working on engine and machinery bearing systems
- Reliability and quality assurance teams preparing Design FMEAs
- OEMs and Tier‑1 suppliers specifying bearing requirements
- Failure analysis and maintenance engineers diagnosing bearing damage
Practical uses:
- Structuring Design FMEA sessions to identify bearing-specific risks
- Prioritizing design changes (material, geometry, oil supply, tolerances)
- Informing test plans, inspection points and supplier quality requirements
- Clarifying responsibilities between OEM design (Design FMEA) and supplier processes (Process FMEA)
Related standards
Keywords: ISO 12132:2017, Design FMEA, thin-walled half bearings, plain bearings, quality assurance, failure modes, bearing design, lubrication, bearing wear, cavitation erosion.
