SH/T 0427-1992 Determination of gear wear for lubricating grease

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: SH/T 0427-92
• Full title: Determination of gear wear for lubricating grease
• English name: not provided in the available source
• Replacement relationship: replaces ZB F36 017-88
• Year confirmation: the source states "(2(1 year confirmation)"; the specific year requires confirmation against the source standard (source-text extraction)
• Approval/implementation: approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20

2. Scope of application and non-applicability

• This standard specifies the method for determining the gear wear value of lubricating grease.
• This standard is applicable to the determination of the gear wear value of lubricating grease, to indicate the relative lubricating performance of the lubricating grease.
• Non-applicable scope: not provided in the available source.

3. Method principle

Test gears of known wear performance (four pairs) coated with the test lubricating grease are subjected to reciprocating operation under a specified load; after a specified number of cycles, the average mass loss of the brass gears is taken as the wear value.

4. Reagents and materials (purity / preparation)

• 4.1 190 solvent naphtha (GB 1992)
• 4.2 petroleum ether (HG 3-1003)
• 4.3 di(2ethylhexyl) sebacate: industrial grade (name requires confirmation against the source standard (source-text extraction); suspected to be "di(2-ethylhexyl) sebacate")
• 4.4 Test gears: four pairs, each pair consisting of one brass gear and one steel gear; gear specifications are given in Table 1.

Table 1 Gear specifications

5. Apparatus and equipment

• 5.1 Gear wear testing machine (see Figure 1)
  • 5.1.1 Drive shaft: includes a drive pulley with outer diameter 25.4mm and a device for mounting the brass gear (see Figure 2).
  • 5.1.2 Driven shaft: includes a load pulley with outer diameter 25.4mm and a device for mounting the steel gear (see Figure 2).
• 5.2 Drive mechanism: reciprocating motion (sinusoidal motion), amplitude 79.76mm, 50cy/min, with a rotation counter.
• 5.3 Weight: 22.24N (see Figure 1)
• 5.4 Weight: 44.48N (see Figure 1)
• 5.5 Oven: 71℃
• 5.6 Balance: sensitivity 0.1mg
• 5.7 Container: used to hold the di(2ethylhexyl) sebacate that contacts the steel gear
• 5.8 Brush: hard-bristle brush

6. Recommended operating conditions

• Load: 22.24N, 44.48N
• Number of reciprocating operation cycles: running-in 1500cy; test 6000cy; after adding load 3000cy
• Drive mechanism: amplitude 79.76mm, 50cy/min
• Oven temperature: 71℃
• Balance sensitivity: 0.1mg

7. Sampling and specimen preparation

• Weigh about 1g of sample as the test portion (the source states "about 19"; requires confirmation against the source standard (source-text extraction); suspected to be "about 1g").

8. Analytical procedure

• 7.1 Mount the brass gear on the drive shaft and the steel gear on the driven shaft, and fit them into the marked grooves on the gears to ensure that the gear test assembly is in the same relative position each time it is assembled.
  • 7.1.1 Cleaning, drying and weighing of gears:
    • 7.1.1.1 Scrub the test gears with a hard-bristle brush and solvent naphtha.
    • 7.1.1.2 Rinse the gears in petroleum ether and dry them in an oven at 71℃.
    • 7.1.1.3 Remove the gears from the oven, cool, weigh and record the mass of the brass gear (to the nearest 0.1mg).
• 7.2 Assembly of the test apparatus:
  • 7.2.1 Mount the brass gear on the drive shaft and the steel gear on the driven shaft of the gear wear testing machine (see Figure 1), and fit them into the marked grooves to ensure the fixed position of the test gears (see 7.1).
  • 7.2.2 Wind a soft rope around the pulley to connect the drive shaft to the reciprocating mechanism, and add 22.24N to the driven shaft (see Figure 1).
• 7.3 Operation process for examining gear performance:
  • 7.3.1 Place the container (see 5.7) under the steel gear, and pour di(2ethylhexyl) sebacate into the container until the lower teeth of the steel gear are immersed.
  • 7.3.2 Start the reciprocating mechanism and run it reciprocally for 1500cy for running-in.
  • 7.3.3 After completing the above number of cycles, stop the machine, remove the gears, clean and dry the gear pair as in 7.1.1, and weigh the brass gear.
  • 7.3.4 If the mass loss of the brass gear does not exceed 2mg, this gear pair may be used for the test; if the mass loss exceeds 2mg, discard this gear pair.
  • Note: Using a drip oiler during the operation for examining gear performance can ensure effective removal of wear debris from the gears.
• 7.4 Assemble the qualified gear pair after running-in as in clause 7.2, and apply the material evenly to the meshing surfaces of the gears. Then, start the reciprocating drive mechanism and run it reciprocally for 6000cy.
• 7.5 After the test operation is completed, remove the gears, clean and dry the gear pair as in 7.1.1, and weigh the brass gear.
• 7.6 Add a load of 44.48N to the driven shaft, and operate as in clause 7.2 for 3000cy.
• 7.7 After the operation in 3000cy is completed, remove and clean the gears, and weigh the brass gear as described in 7.1.1.
• 7.8 Carry out four complete tests, using new gears each time, and calculate the mass loss of the brass gear per 1000cy for the 6000cy and 3000cy operations separately (to the nearest 0.1mg).

9. Qualitative and quantitative determination and calculation formula

• Report the average mass loss per thousand cycles of the brass gear after operating under a force of 22.24N for 6000cy (mg/1000cy).
• Report the average mass loss per thousand cycles of the brass gear after operating under a force of 44.48N for 8000cy (mg/1000cy).
  • Note: The second sentence of clause 8 in the source is "8000cy", which is inconsistent with "3000cy" in clause 7.6; requires confirmation against the source standard (source-text extraction).
• Calculation formula: not provided in the available source.

10. Precision

Not provided in the available source.

11. Report

• Report the average mass loss per thousand cycles of the brass gear after operating under a force of 22.24N for 6000cy (mg/1000cy).
• Report the average mass loss per thousand cycles of the brass gear after operating under a force of 44.48N for 8000cy (mg/1000cy).
  • Note: The second sentence of clause 8 in the source is "8000cy", which is inconsistent with "3000cy" in clause 7.6; requires confirmation against the source standard (source-text extraction).

12. Referenced documents

• GB 1992 Solvent naphtha
• HG 3-1003 Chemical reagent petroleum ether
• Reference adoption: United States Federal Test Method Standard FS 791 B 335.2 "Gear Wear Method"

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick-reference Q&A