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NB/SH/T 0845-2010 (NB/SH/T0845-2010)

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NB/SH/T 0845-2010
ICS 75.100
E 34
Determination of viscosity shear stability of transmission
lubricants using the tapered roller bearing rig
Issued by. National Energy Administration
Table of Contents
Foreword... 3 
1 Scope... 4 
2 Normative references... 4 
3 Method overview... 4 
4 Test equipment... 5 
5 Reagents and materials... 5 
6 Preparations... 5 
7 Calibration and measurement uncertainty... 9 
8 Test steps... 10 
9 Test evaluation... 10 
10 Test report and test validity... 11 
11 Reference oil calibrating machine... 11 
12 Precision... 12 
Appendix A (Informative) Comparison of the chapter numbers between this standard
and CEC L-45-99 (2008)... 14 
Appendix B (Informative) Shear stability test report for tapered roller bearings... 15 
Determination of viscosity shear stability of transmission
lubricants using the tapered roller bearing rig
1 Scope
1.1 This standard specifies a test method, for evaluating the viscosity shear stability of
transmission lubricants, using a tapered roller bearing rig.
1.2 This standard applies to all kinds of transmission lubricants.
1.3 This standard deals with certain hazardous materials, operations, equipment, BUT
is not intended to make recommendations on all safety issues related thereto. Therefore,
users shall establish appropriate safety and protective measures AND determine the
applicability of relevant regulatory restrictions, before using this standard.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 265 Petroleum products - Determination of kinematic viscosity and
calculation of kinematic viscosity
JJF 1001 General terms in metrology and their definitions
JJF 1059 Evaluation and expression of uncertainty in measurement
3 Method overview
This method uses a tapered roller bearing rig, under the test conditions similar to the
gearbox, to make the lubricant be subject to the action of mechanical shear stress,
resulting in permanent viscosity loss; uses the drop rate of the kinematic viscosity of
lubricant, to represent the viscosity shear stability of the lubricant.
4 Test equipment
4.1 Rig. Standard four-ball extreme pressure rig, with constant temperature control.
4.2 Test head. The test head is equipped with a tapered roller bearing. The schematic
diagram of the tapered roller bearing and its adapter is as shown in Figure 1.The
schematic diagram of the circulation of the heating or cooling liquid, in the heating or
cooling body, is as shown in Figure 2.
4.3 Test piece. SKF32008XQ tapered roller bearing.
5 Reagents and materials
5.1 N-heptane. Analytically pure, which is used for cleaning test pieces.
5.2 The reference oils are as follows.
5.2.1 CEC RL181, which is also used as running-in oil.
5.2.2 CEC RL209.
5.2.3 CEC RL210.
Note. The detailed specifications and other information of the above reference oils can be found
in the CEC Reference Oil Handbook CEC P-72-98.The latest reference oil data can also be
select the reference oil.
6 Preparations
6.1 Preparation of tapered roller bearings and their adapters
6.1.1 Running-in of tapered roller bearings
Vsol - The kinematic viscosity of test lubricant (100 °C) before test, mm2/s;
Vcol - The kinematic viscosity of test lubricant (100 °C) after test, mm2/s
Note. The smaller the relative viscosity loss value, the higher the viscosity stability.
10 Test report and test validity
10.1 Basic content of the test report
The basic contents of the test report shall mainly include.
- The name and address of the laboratory;
- The unique identification of the report and the unique identification of each page,
as well as the total number of pages of the report;
- The name and address of the customer;
- The description and identification of the test items;
- The identification of the test procedure or description of the test method/procedure.
10.2 Operation data
- The operating conditions;
- The tapered roller bearings used;
- The lubricant used;
- The special events (e.g., interruptions).
10.3 Result representation
- Viscosity shear loss percentage of the test lubricant (%).
11 Reference oil calibrating machine
11.1 Reference oil calibrating machine