NB/SH/T 0845-2010 Viscosity Shear Stability of Transmission Lubricants — Tapered Roller Bearing Rig

AI-translated method card — human verification pending. This is not an official translation of the standard. Check the original controlled standard before use.

Source limitations: The extracted running-in flow conflicts with the scanned diagram and must not be used for operation or acceptance. Watermarks obscure some precision values and reference-oil batch suffixes; these remain unverified. Figures, the complete calibration matrix, traceability guidance and appendices are not fully reproduced. Annex B is mentioned in the foreword but its body is absent from the stored scan. Selected transcription corrections were visually checked, not independently technically approved. This card is not the complete standard and does not establish current validity, equivalence or product suitability.

1. Designation / full title / English title / supersession

• Designation: NB/SH/T 0845—2010 (the cover OCR also produced "NB/SE/T 0845—2010"; OCR verification pending).
• Chinese title, translated: Determination of viscosity shear stability of transmission lubricants using the tapered roller bearing rig.
• English title: Determination of viscosity shear stability of transmission lubricants using the tapered roller bearing rig.
• Supersession: Not found in the source; no superseded designation is given.
• Adoption statement: Modified adoption of CEC L-45-99 (2008), Determination of viscosity shear stability of transmission lubricants; redrafted from CEC L-45-99 (2008).
• Publication / implementation: Issued 2011-01-09; implemented 2011-05-01; issuing authority: National Energy Administration.
• Responsible committee: Petroleum Fuels and Lubricants Subcommittee of the National Technical Committee on Petroleum Products and Lubricants (SAC/TC280/SC1).
• Drafting organizations: Sinopec Research Institute of Petroleum Processing; Dalian Research and Development Center of PetroChina Lubricant Company; Beijing Research and Development Center of Sinopec Lubricant Company.
• Principal drafters, transliterated: Lvqiu Qiming, Song Haiqing, Sun Dong, Yang Jiexian, Xia Peng and Tian Sheng.

2. Scope and exclusions

• 1.1 This standard specifies a method for evaluating the viscosity shear stability of transmission lubricants using a tapered roller bearing rig.
• 1.2 This standard applies to various types of transmission lubricants.
• 1.3 This standard involves certain hazardous materials, operations and equipment, but does not purport to address all associated safety issues. Before use, the user must establish appropriate safety and protective measures and determine the applicability of regulatory limitations.
• Exclusions: Not found in the source.

3. Principle

A tapered roller bearing rig subjects the lubricant to mechanical shear stress under conditions resembling those in a gearbox, causing permanent viscosity loss. Viscosity shear stability is expressed by the decrease in kinematic viscosity between the measurements before and after the test. (Section 3)

4. Reagents and materials: purity / preparation

• 5.1 n-Heptane: Analytical reagent grade, for cleaning test components.
• 5.2 Reference oils:
  • 5.2.1 CEC RL181, also used as the running-in oil.
  • 5.2.2 CEC RL209 (source OCR: "CEC R1209"; OCR verification pending).
  • 5.2.3 CEC RL210 (source OCR: "CEC RI210"; OCR verification pending).
• Note: Detailed specifications and other information for these reference oils are described in the CEC Reference Oil Manual, CEC P-72-98. The source also refers to the CEC website, www.cectests.org, for updated reference-oil data, and to protocol PTC-16 for selection rules.
• Test oil quantity: 40 mL±0.5 mL (see 6.1.2.2 and Table 3).

5. Apparatus

• 4.1 Test machine: A standard four-ball extreme-pressure test machine with thermostatic control.
• 4.2 Test head: Contains a tapered roller bearing. Figure 1 depicts the bearing and adapter; Figure 2 depicts circulation of heating or cooling liquid in the heating or cooling body.
• 4.3 Test component: SKF32008XQ tapered roller bearing (the OCR of Figure 3 contains an inconsistent model prefix and F98008XQ; OCR verification pending).
• Figure 1 component numbers (OCR extraction): 1—base; 2—heating/cooling ring; 3—tapered roller bearing outer ring; 4—spindle insert; 5—mandrel; 6—tapered roller bearing inner ring; 7—O-ring (OCR identified a P-ring; verification pending); 9—test lubricant; 10—clamping nut; 11—control rod; 12—conical mounting point.
• Temperature sensor and temperature control device (6.1.2.2).
• Capillary viscometer (6.3, in accordance with GB/T 265).
• Oil injector (measurement-position column of Table 1).

6. Stated operating conditions

• Table 1. Measurement requirements for operating conditions:

• Table 2. Test parameters (Class A / Class B uncertainty):

• Table 3. Test conditions:

• Note: The test duration or number of motor revolutions is based on an asynchronous motor with a theoretical speed of 1450 r/min. For a motor operating at another speed, adjust the test time accordingly.
• 8.1 Before starting the machine, switch on the temperature controller and preheat the test oil to 50°C±1°C.
• 8.2 Adjust the temperature controller until the oil reaches 60°C±1°C, then start the machine and run the test under the conditions in Table 3.

7. Sampling and specimen preparation

• 6.1 Preparation of the tapered roller bearing and its adapter.
  • 6.1.1 Running in the tapered roller bearing: Before testing, run in the bearing according to the procedure shown in Figure 3.
  • 6.1.2 Cleaning and assembly.
    • 6.1.2.1 Cleaning: Clean the tapered roller bearing and its adapter with a suitable solvent, such as n-heptane, then blow dry.
    • 6.1.2.2 Assembly: Referring to Figure 1, place the outer bearing ring (3) into the cleaned adapter base (1), add 40 mL±0.5 mL of test oil (9), and insert the mandrel (5) into the clean inner ring (6). Carefully place the inner bearing ring into the base and install and tighten the locknut (10) by hand. Fit the prepared bearing adapter to the four-ball extreme-pressure machine using the spindle insert (4), apply a load of 5000 N, connect the temperature sensor and controller, and check their operation.
• 6.3 Kinematic viscosity: Determine the test oil's kinematic viscosity before and after the test at 100°C with a capillary viscometer in accordance with GB/T 265.
• Figure 3 running-in flow (the following original OCR extraction is retained for review only; its step numbers and acceptance/discard branches disagree with the scanned diagram. Every arrow requires verification. Do not use this extraction for operation or acceptance): New tapered roller bearing (SKF32008XQ) → Step 1: determine the kinematic viscosity of fresh RL181 reference oil at 100°C using GB/T 265 → Step 2: test fresh RL181 reference oil according to this standard (1740000 r in total, approximately 19 h 40 min) → Step 3: determine the used RL181 reference oil's kinematic viscosity at 100°C using GB/T 265 → Step 4: the extraction says to use the bearing for oil evaluation at a viscosity loss of 15%~20%; otherwise, run in with fresh RL181 for 80 h (Step 5), and repeat Steps 2, 3 and 4. It then describes loss of 10%~15% or >20%, a return to Step 2 after an accumulated 230 h, and a decision on further RL181 running-in, additional time or disposal. It describes disposal and return to Step 1 at loss <10%, and use for oil evaluation at loss of 15%~20%. These extracted branch assignments remain unverified.

8. Test procedure

• 8.1 Before starting the machine, switch on the temperature controller and preheat the test oil to 50°C±1°C.
• 8.2 Adjust the temperature controller until the oil reaches 60°C±1°C, then start the machine and test under the conditions specified in Table 3.
• 8.3 Stop the test, switch off the temperature controller, remove the tapered roller bearing adapter from the machine, dismantle the adapter and pour the test oil into a clean container.
• 8.4 Determine the test oil's kinematic viscosity at 100°C before and after testing in accordance with GB/T 265, and calculate the relative viscosity change Rᵢ (%) using 9.1.1.

9. Evaluation and calculation

• 9.1 Evaluation of relative viscosity change.
• 9.1.1 The viscosity shear stability of the test oil is expressed as the relative viscosity loss Rᵢ (%) calculated by Equation (1): Rᵢ = (Vₛ − Vₑ) / Vₛ × 100 where:
• Vₛ—kinematic viscosity of the test oil before testing at 100°C, in mm²/s;
• Vₑ—kinematic viscosity of the test oil after testing at 100°C, in mm²/s.
• Note: A smaller relative viscosity loss indicates higher viscosity stability.
• Source OCR rendered the symbols as "Ya, Ye, Vsl", inconsistent with "V., V." in the definitions; OCR verification remains pending. This card uses Vₛ and Vₑ for viscosity before and after testing. The scanned equation uses Vₛₒₜ and Vₑₒₜ; the subscript transcription still requires independent review. The structure—difference divided by the initial value, then expressed as a percentage—has been visually compared.

10. Precision

• Precision was evaluated using the specified three reference oils. Their repeatability and reproducibility evaluation results are in Table 6 (OCR labels one table as "Table 6: repeatability and reproducibility evaluation results" and another as "Table 6: reference-oil pass/fail limits"; table-number verification remains pending).
• Table 6. Repeatability and reproducibility evaluation results (OCR extraction; numerical uncertainties require verification):

• Note: Clearly legible numbers of results, numbers of laboratories and reproducibility values have been corrected against the stored scan. Parentheses contain target values, not another set of measured results. A watermark obscures some characters; the repeatability column and reference-oil batch suffixes still require verification. Do not configure acceptance thresholds from this table. The extracted running-in flow must not be used for operation or acceptance. Figures, the full calibration matrix, traceability guidance and appendices are incomplete; the body of Annex B is absent from the stored scan.

11. Reporting

• 10.1 Basic report information should include:
  • Laboratory name and address;
  • Unique report identification, unique identification on each page and total number of pages;
  • Customer name and address;
  • Description and identification of the test item;
  • Identification of the test procedure, or description of the method/process.
• 10.2 Operating data:
  • Operating conditions;
  • Tapered roller bearing used;
  • Lubricant used;
  • Special events, such as interruptions.
• 10.3 Results:
  • Percentage viscosity loss of the test oil due to shear (%).

12. Referenced documents

• GB/T 265, Petroleum products—Determination of kinematic viscosity and calculation of dynamic viscosity (source OCR: "CB/T 265"; verification pending).
• JJF 1001, General terms in metrology and their definitions.
• JJF 1059, Evaluation and expression of uncertainty in measurement.
• Note: Terms and definitions concerning metrological traceability refer to JJF 1001 and JJF 1059 (source OCR: "JF 1001 and JF 1059"; verification pending).

13. Source and verification record

• Transcription review: The original PDF remains unchanged. Only clearly legible measurement-range entries, selected precision-table values and a protocol code have been corrected. The running-in flow, obscured precision values and reference-oil batch suffixes remain unverified. Figures, the full calibration matrix, traceability guidance and appendices are not fully reproduced in this card. Annex B is mentioned in the foreword, but its body was not found in the stored scan. This review does not establish completeness, current validity or any product-method suitability relationship.
• Annex A (informative): Comparison of the clause numbering in this standard and CEC L-45-99 (2008), in Table A.1. Except for the clauses listed in Table A.1, the other clause numbers are stated to be the same as in CEC L-45-99 (2008), with corresponding content. Annex A and Annex B are informative.
• Main technical differences from CEC L-45-99 (2008), as stated in the foreword: Addition of "1 Scope", "2 Normative references", "3 Summary of method" and "5 Reagents and materials"; removal of standards in CEC L-45-99 (2008) that are not cited here, with cited documents replaced by the corresponding Chinese standards described as current at publication; removal of "7.3 Standards/definitions", "12 Documents", "13 Identification/quality" and "14 Oil database" from CEC L-45-99 (2008).
• Publication information: China Petrochemical Press; edition 1, April (month 4) 2011; printing 1, April (month 4) 2011; book number 155114·0251; printed cover price CNY 15.00 (historical publication information).

14. Quick reference