The FZG Gear Tension Test Bench

The FZG test (gear tension test) is the most important test for the pressure load capacity of gear lubricants. 

The load is divided into 12 damage force levels. Tensioning is achieved by hanging weights on a lever arm. After each stage, the gears are checked. In the case of guzzlers, the test is aborted. Usually, the test wheels run in immersion lubrication in oil. However, it is also possible to spray in the oil or a fluid grease

The Tribology Competence Center also has a test bench, which is completely installed in a climatic chamber. This allows cold tests down to -25°C. Especially for the wind power sector, real conditions can be optimally specified in this way.

Test bench parameters
Test gears Type A for feeding tests
Type C-PT for pitting test
Type A10 for higher pressings (half tooth width)
Type C-GF for micropitting tests
Pinion speed For oils 2170 1/min
For fats 725 1/min
for adhesive lubricants 24 1/min
Temperature at the beginning of the test run For oils 90 +/- 3°C
For fats 50°C
for adhesive lubricants RT
Lubricant quantity for splash lubrication approx. 1,25 l
Movement types Rolling
Friction conditions Elastohydrodynamics, mixed and boundary friction
Contact geometry Line contact
Glutton
Pitting
Gray Stain

Exams

  • Determination of the scuffing load capacity according to DIN ISO 14635-1 to -3
  • Mechanical testing of lubricants in the FZG gear tension testing machine according to DIN 51354
  • Pitting test according to FVA Info Sheet No. 2/IV or FVA 371 Pitting Test
  • Gray spot test according to FVA No. 54/7
  • DGMK Gray Stain Short Test (GFKT) No. 575
  • Shock load test S-A/16.6R/90