What is ISO 21866‑1 about?
ISO 21866‑1 is the first part of the multi-series of International Standard on plain bearings.
ISO 21866‑1 applicable to the plain bearings for automotive engine bearing test rig using actual connecting rods.
ISO 21866‑1 specifies the requirements for an engine bearing test using actual connecting rods rig that uses an actual connecting rod to determine plain bearing performance in automotive engines, evaluating fundamental bearing properties such as seizure resistance, wear resistance, fatigue resistance and resistance to the impact of foreign material.
Who is ISO 21866‑1 for?
ISO 21866‑1 on automotive engine bearing test rig is relevant to:
- Test rig & OEM manufacturers  
- Civil and industrial engineers
- Automotive industry
- Semiconductor industry
Why should you use ISO 21866‑1?
Plain bearings are used for sliding, rotating, oscillating or reciprocating motion. Plain bearings support and guide moving components inside the engine. So far, the test rig used for plain bearings has been developed with the application of elasto-hydrodynamic lubrication theory (EHL).
According to ISO 21866-1, the stiffness of automotive engine bearings and housings has lately been reduced due to the demand for weight reduction and they are getting easier to be deformed. Meanwhile, higher combustion pressure and bearing oil film pressure has been increasing in efforts to produce clean combustion with great heat efficiency.
Also, the minimum oil film thickness for bearing has been made thinner by using low-viscosity oil to reduce friction loss. The plain bearings for automotive engines have a tough situation because of all these changes. That said, the challenge of lower rigidity of a connecting rod bearing for automotive engine persists.
The aim of ISO 21866-1 is to reduce the time and expense of engine bearing testing in order to meet the requirements of automotive engine bearings now and in the future by using connecting rods from actual cars.
Overall, ISO 21866-1 evaluates bearings for each car using the actual engine. This can help improve operational efficiency of the end-use application as the varying magnitude and pattern of load and engine speeds are kept in mind.
