ISO/TC 123/SC 7 - Special types of plain bearings

This document specifies a procedure to measure the adhesion strength of diamond-like carbon (DLC) coatings specified in ISO 20523 by detecting acoustic emission signals using ball-on-disk method under the lubricated condition. DLC is normally coated on metal or ceramic. The test results are not applicable when the DLC coated parts operate in an unlubricated environment.

This document specifies the material compositions and the required properties of fluid film bearings used for vehicular turbochargers.

This document specifies a bearing with embedded solid lubricants, which has been widely used as a solid lubricant bearing.

This document specifies requirements for some commonly used pad lining materials utilized on tilting pad bearings. The requirements in this document are expressed by specifying the chemical composition of the lining materials. Other lining materials can be used if they have been proven to be equally suitable at the required operating conditions. Descriptive characteristics of the lining materials are given along with the appropriate selection of pad backing and pivot materials.

This document specifies the dimensions and tolerances for inserted thermoplastic bushes used as plain bearings with or without lubrication grooves in accordance with ISO 12128. These thermoplastic bushes are dimensionally exchangeable to wrapped bushes according to ISO 3547-1. This document is not applicable to reinforced plastics.

This document specifies the dimensions and tolerances applicable to sintered bearings for the following ranges of inside diameters: — cylindrical bearings: 1 mm to 60 mm; — flanged bearings: 1 mm to 60 mm; — spherical bearings: 1 mm to 20 mm.

This document describes a method for comparing the performance test results of foil journal bearings, which are lubricated by air (gas) and supported by the gas-dynamic force generated via the rotations of the rotating shaft. The test procedure proposed in this document aims to predict and evaluate the static load capacity, friction coefficient and lifetime of foil journal bearings and compare the results of these parameters under different test conditions, i.e. at varying dimensions of foil bearing, rotational speed of a shaft, pressure and humidity of the surroundings. The magnitude of the static load capacity can change according to the test setting, as the test conditions can be changed. The test method described in this document has the following application coverage. a) The criterion for evaluating the static load capacity is the steady-state condition; i.e. the method is applicable under limited operating conditions with uniform magnitude, load direction and rotational speed. b) The evaluation procedure can be applied only if the foil journal bearing is under a uniform rotating inertia at an arbitrary rotational speed. c) The dynamic load with time-variant magnitude and direction is not considered.

This document specifies the method for comparing performance evaluation results for a foil thrust bearing that supports load with aerodynamic force generated by the rotation of a driving shaft and lubricates using air, not lubricating oil. The test procedure explained in this document measures and evaluates the static load capacity, bearing torque, friction coefficient and lifetime of the foil thrust bearing and compares the test results to those for different test conditions. The measured static load capacity can be varied depending on the capabilities of the test device used.

Directed lubrication is an advanced technology that is capable of reducing the power loss and improving the performance of tilting pad type bearings. Unlike flooded lubrication, where the bearing components remain permanently submerged in an oil filled housing, with directed lubrication the components are not submerged and the oil is delivered from an external source directly to the working surfaces of the tilting pads after which it falls freely away to be drained from the bottom of the housing. There are several alternative methods of realising the benefits of directed lubrication in tilting pad bearing designs. As an example, this document specifies a spray nozzle type directed lubrication system where lubricant is supplied to each pad through nozzles mounted between the pads in tilting pad thrust and journal bearings. The design concept of this type of lubrication is described.

ISO 20054:2016 specifies a bearing containing dispersed solid lubricants which is used as a solid lubricant bearing.

ISO/TR 17606:2014 specifies lubrication characteristics of grooves and pockets on crosshead pin bearings for low-speed marine diesel engines. It is applicable to the design of axial oil groove and pocket types as an oil supply method.

ISO 20054:2016 specifies a bearing containing dispersed solid lubricants which is used as a solid lubricant bearing.

This document specifies requirements for tilting pad bearing lining materials (metals and polymers), backing metals and pivots.

This document specifies the material compositions and required properties of fluid film bearings used for vehicular turbochargers.

ISO 19259:2015 specifies a bearing with embedded solid lubricants which has been widely used as a solid lubricant bearing.

ISO 2795:2014 specifies the dimensions and tolerances applicable to sintered bearings for the following ranges of inside diameters: cylindrical bearings: 1 mm to 60 mm; flanged bearings: 1 mm to 60 mm; spherical bearings: 1 mm to 20 mm.

ISO 13939:2012 describes a method of comparing the performance test results of foil journal bearings, which are lubricated by air (gas) and supported by hydrodynamic force generated by the rotation of the rotating shaft. The test procedure proposed in ISO 13939:2012 aims to predict and evaluate the static load capacity, friction coefficient and lifetime of the foil journal bearing, and compare the results with those occurring under different test conditions, i.e. dimensions of a foil bearing, rotational speed of a shaft, pressure and humidity of surroundings and so on. The magnitude of the static load capacity can change according to the test setting, as the test conditions can be changed. The test method described in ISO 13939:2012 has the following application coverage: the criterion of the static load capacity is the steady-state, i.e. it is applied in a limited operating condition with a uniform magnitude, load direction and rotational speed; the evaluation procedure can be applied only if the foil journal bearing is under a uniform rotating inertia at an arbitrary rotational speed; the dynamic load with a time-variant magnitude and direction is not taken into consideration.

ISO 14287:2012 specifies requirements for materials based on metals, polymers, back metals and pivots for the manufacture of tilting pad bearings.

ISO 16287:2005 specifies the dimensions and tolerances for inserted thermoplastic bushes used as plain bearings with or without lubrication grooves in accordance with ISO 12128. These thermoplastic bushes are dimensionally exchangeable to wrapped bushes according to ISO 3547-1. It is not applicable to reinforced plastics.

Applies to sintered bearings for inside diameters as follows: cylindrical bearings: 1 mm to 60 mm; flanged bearings: 1 mm to 60 mm; spherical bearings: 1 mm to 20 mm. This fourth edition cancels and replaces the third edition (1986).