Theorie der Zahnradschmierung

Part of the Schriftenreihe Antriebstechnik book series (SCHAT, volume 16)

Theory of Gear Lubrication and Pitting


The paper is divided into three parts. First, the formation of the oil film is discussed, then its breakdown and lastly, pitting.

The existance of an oil film between heavily loaded discs has been shown by an unfamiliar method. If a current is passed from one disc to another, through the contact line, it is found that there is a breakdown voltage of about 1/4 volt, which is largely independant of the current (between 0.2 and 350 amps).

The passage of current causes the oil to ionise and this allows any amount of current to pass. The breakdown voltage is proportional to the oil film thickness and varies with speed and load. There is always an oil film, even at the slowest speed investigated (80 cm/sec.). Various hypotheses are put forward to explain the observation.

The various theories of scuffing are studied and a new one advanced which makes use of the fact that all common steels start to soften at about 250°C. The actual scuffing is due to a.“cold” pressure welding. The breakdown of the oil film was studied experimentally by passing a large current through the oil film. It was found that the sum of the mechanical frictional energy and the electrical energy was constant. This, means that the temperature at the start of scuffing remained the same.

Finally, pitting is discussed. It is shown from a study of about 80 microsections that all cracks start from the surface of the metal and work downwards. The orientation of the crack is determined by the grain distortion of the material. This accounts for the fact that almost all pits are found in the dedendum of the teeth.


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  1. [1]
    Watson, H. J., J. Inst. Petrol. 1952 38 763.Google Scholar
  2. [2]
    Cameron, A., ibid. 195238614.Google Scholar
  3. [3]
    Dörr, J., Archiv. 1954 22 171.zbMATHGoogle Scholar
  4. [4]
    Cameron, A., Schriftenreihe Antriebstechnik, Vieweg 1950, Seite 139.Google Scholar
  5. [5]
    Brix, V. H., Aircraft Engineering, 1947 19 294.Google Scholar
  6. [6]
    Beeck, O., Givens, J. W., and Smith, A. E., Proc. Roy. Soc. 1940 177 90.CrossRefGoogle Scholar
  7. [7]
    Howlett, J., J. Appl Phys 1946 17 137.CrossRefGoogle Scholar
  8. [8]
    Maxwell, J. C., Phil Trans 1867 157 52.Google Scholar
  9. [9]
    Mason, W. P., Trans A. S. M. E. 1947 68 359.Google Scholar
  10. [10]
    Heidebroek, E., ZVDI 1951 93 1012.Google Scholar
  11. [11]
    Cattaneo, A. G., Borsoff V. N. & Accinelli J. B. Trans A. S. M. E. 1951 73 687.Google Scholar
  12. [12]
    Hofer, H., Werkstattstechnik 1931 5 128.Google Scholar
  13. [13]
    Biok, H., Proc Discn on Lubn. Inst Mech Eng. London 1937 2 14.Google Scholar
  14. [14]
    Cameron, A., This conference Testing of Marine Gears.Google Scholar
  15. [15]
    Mansion, H. D., J. Inst. Petrol. 1952 38 633.Google Scholar
  16. [16]
    Way, S., J. Appl Mech 1940 7 A 147.Google Scholar
  17. [17]
    Niemann, G., Z. V. D. I. 1943 87 521.Google Scholar

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© Springer Fachmedien Wiesbaden 1955

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