自動車用ギヤ油の耐スコーリング性評価法

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タイトル別名
  • Development of Scoring Test Methods for Automotive Gear Lubricants

抄録

The test methods to evaluate scoring resistances of automotive gear oils, were studied by means of the vehicle test using a 1, 770cc passenger car and the laboratory test using a Timken extreme pressure test machine.<br>(1) The vehicle tests were carried out on a chassis dynamometer under a driving mode of the modified IP-MIRA high speed shock test. Under the first test condition (Method A) which corresponded to the acutual even-road driving, scoring did not occur even with the SAE 80 GL-3 gear oil (Table 6). Therefore, the next test condition (Method B) was set in order to increase the strengths of shock loads. The running resistance of method B was based only on inertia resistance; and other resistances, for example, rolling resistance, air resistance, speed resistance and grade resistance were neglected. Under this condition, scoring was found on the coast side surface of the ring gears and on the pinion gears in the case of GL-3 and GL-4 gear oils. The scored area seem to be proportional to the scoring resistance of each oil (Table 7). These results indicate that the vehicle test by method B is suitable as a scoring test method for evaluation of scoring-resistances of various grade gear oils.<br>(2) In order to establish a laboratory screening test method that correlates with the vehicle test, scoring resistances of automotive gear oils were examined using the Timken test machine under various test conditions.<br>The test conditions used are shown in Table 4.<br>The results are shown in Table 8. It was found that the results obtained under the standerd test condition "800rpm•52°C", which is defined by the Fedcral Test Method, did not correlate with the results of the vehicle test. On the other hand, the results under test condition "2, 000rpm•95°C" correlated with the vehicle test results (Fig. 7). These results would suggest that the test condition "2, 000rpm•95°C" is much closer to the lubricating condition of the vehicle test. We call this Timken test condition "high speed-high temperature test method".

収録刊行物

  • 石油学会誌

    石油学会誌 25 (5), 315-322, 1982

    公益社団法人 石油学会

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