GB/T 28278.1-2012Plain bearings -- Hydrostatic plain journal bearings without drainage grooves under steady-state conditions -- Part 1: Calculation of oil-lubricated plain journal bearings without drainage grooves (English PDF)

1 Scope

This part of GB/T 28278 is suitable for static pressure radial plain bearings under steady state conditions.

This part of GB/T 28278 is only for lubrication between the oil chambers without the oil return.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated version is used in this article

Pieces. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 28278.2-2012 Plain bearings without return sumps under steady state conditions Hydrostatic radial bearings - Part 2. No (ISO 12168-2..2001, IDT) for lubricating radial plain bearings

ISO 3448..1992 Industrial liquid lubricants ISO viscosity classification (Industrialliquidlubricants-ISO viscosity) classification

3 Calculate the basic principles and boundary conditions

The purpose of this part of the calculation is to determine the bearing operating conditions, geometry and lubricating oil and other related hydrostatic bearing operating parameters,

That is to determine the bearing eccentricity, carrying capacity, oil film stiffness, oil pressure, oil flow, friction power, pump power and temperature rise. except

Considering the static pressure of the bearing, the hydrodynamic effect of the bearing is also approximated.

The Reynolds equation provides a theoretical basis for the calculation of hydrostatic bearings. However, in most practical applications, it can be reached by approximate calculation

To the desired precision.

The approximation used in this section is to use two integral equations to describe the state of the oil flowing through the bearing and journal surface gaps.

These two integral equations can be derived from the Reynolds equation using specific boundary conditions. The Haagen-Burtonian law describes the parallel surface gap

The pressure flow, the Kurt formula describes the shear flow generated by the journal rotation in the bearing clearance. The theoretical basis of the computational process is given in Appendix A.

A detailed description of the.

The following important assumptions are used in the calculation process given in this section.

a) The flow of the lubricating oil is laminar flow.

b) The lubricating oil is completely adhered to the lubricated surface.

c) Lubricants are incompressible Newtonian fluids.

d) The lubricating oil in the entire lubrication gap and in the front restrictor is of equal viscosity.

e) The lubrication gap is completely filled with lubricating oil.

f) The pressure gradient in the film thickness direction is zero.

g) The journal and bearing surfaces that make up the lubrication gap are rigid.

h) The radius of curvature of the relative moving surface is much greater than the thickness of the lubricating film.

i) The thickness of the lubricating film is set in the axial direction (z-axis direction). […]