What is ISO 31657‑3 about?

ISO 31657‑3 is the third part of a series of documents on tilting pad journal bearings. ISO 31657‑3 specifies the characteristic values for selected tilting-pad journal bearings with four or five centrally or eccentrically supported tilting pads and with angular spans of pad sliding surfaces of Ω = 80°, 60° and 45°.

The functions plotted and listed in the table form below are required for the operationally safe design of hydrodynamic tilting-pad journal bearings according to ISO/TS 31657-1. They are based on the presumptions and boundary conditions indicated there and only apply to stationary operating states. The symbols used are explained in ISO/TS 31657-1; calculation examples are also included there.

The calculation method described in ISO/TS 31657-1 can also be used for other tilting-pad journal bearing designs if the numerical solutions of the basic equations are available in the same manner for these designs.

Who is ISO 31657‑3 for?

ISO 31657‑3 on tilting pad journal bearings is relevant to:

Manufacturer of tilting-pad journal bearings
Suppliers and customers of tilting-pad journal bearings
Mechanical engineer
Mechanical drafters

Why should you use ISO 31657‑3?

Tilting pad journal bearings are designed to transfer high axial loads from rotating shafts with minimum power loss.

ISO 31657‑3 provide information on functions for calculation of tilting-pad journal bearings with four tilting pads, tilting-pad journal bearings with five tilting pads, characteristic curves for tilting-pad bearings with five pads.

As a user of ISO 31657‑3, you can be ensured of all the functions used in the calculation procedure required to design and operate tilting-pad journal bearings. ISO 31657‑3 helps you in manufacturing high-quality tilting-pad journal bearings. With the necessary guidance and compliance to ISO 31657‑3, the user can improve the quality and operation of tilting-pad journal bearings.

PD ISO/TS 31657-3:2020

Plain bearings. Hydrodynamic plain journal bearings under steady-state conditions - Functions for calculation of tilting pad journal bearings

Published:

30 Jun 2020

Withdrawn:

22 Oct 2025