GB/T 39982-2021Water lubricated journal bearings—Test methods of load carrying capacity (English PDF)

1 Scope

This document gives a test method for the load-carrying capacity of radial sliding bearings under hydrodynamic lubrication under completely water-immersed conditions.

This document is applicable to water-lubricated radial sliding bearings of polymer, graphite and rubber materials with a diameter less than 150mm.

This document is applicable to the verification test at the product design stage.

Note: There are many factors that affect the load-carrying capacity of water-lubricated bearings. In order to ensure the adaptability of the test results into actual use, it is advisable to simulate the actual operation of the bearing as much as possible Environment to get more credible results. Different requirements in practical applications have promoted the development of a variety of sliding bearing load-bearing capacity test benches.

The lubrication conditions and test parameters used on some test benches are not specified in detail, so the test results obtained on different test benches are usually neither comparable nor comparable.

Can not be applied in practice. The same bearing may get inconsistent data in different test benches.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Symbols and description

The following symbols apply to this document, see Table 1.

5 Test principle

During the operation of water-lubricated radial sliding bearings, as the load increases, the friction factor will first decrease and then increase.

When the water film is ruptured, the friction factor of the bearing will rise sharply, which will accelerate the wear of the bearing and cause the bearing to fail. By monitoring the bearing during the test The changing trend of the friction factor is based on the sharp increase of the friction factor to judge the bearing capacity of the bearing under hydrodynamic lubrication conditions.

6 Test conditions

This test uses water as the lubricating medium. If you want to simulate the actual working environment (such as rivers, rivers, lakes, seas and other natural environments), you should give a lubrication guide Quality parameters such as temperature, salt content, sand content and particle size.

7 Test device

8 Samples

There are at least 4 bearing samples, 3 samples are taken for testing, and the other is a backup sample. The bearing sample should provide the following project parameter data.

---Bearing material;

---Bearing size and tolerance class (inner diameter, outer diameter, width);

--- Cylindricity and coaxiality of the bearing;

---Bearing surface roughness;

---The elastic modulus and Poisson's ratio of the bearing material.

9 Test procedure

10 Test data processing

11 Test report

The test report should contain at least the following content.

a) Number of this document.

b) Bearing sample.

- Bearing material;

- Bearing size (inner diameter, outer diameter, width);

- Bearing geometric tolerance (cylindricity and coaxiality);

- Bearing surface roughness;

- The elastic modulus and Poisson's ratio of the bearing material;

- The number of samples in each group.

c) Test device.

- Description of mechanical structure;

- Rated load;

- Rated speed;

- Sensor accuracy;

- The radial and axial dimensions of the bearing seat;

- Test journal size and tolerance, shape and position tolerance, surface roughness, hardness.

d) Test condition parameters.

- The temperature of the lubricating medium;

- The salt content of the lubricating medium;

- Sand content and particle size of lubricating medium.

e) Test process.

- Speed, load and running-in time during the running-in process;

- The load increment of the load during the test and the test time for each load;

- The change of test speed with time.

f) Test results.

- The relationship curve between friction factor and load;

- The bearing capacity and average value of the three sets of bearing samples;

- The test results should include a description of the damage, such as the location and extent of the damage, whether there is abrasion or scratches.

g) Test date.

h) Test personnel.