ATF Characteristics Required for the Latest Automatic Transmissions

Paper #:
  • 932849

Published:
  • 1993-10-01
Citation:
Ashikawa, R., Naruse, T., Kurashina, H., Matsuoka, T. et al., "ATF Characteristics Required for the Latest Automatic Transmissions," SAE Technical Paper 932849, 1993, https://doi.org/10.4271/932849.
Pages:
9
Abstract:
This paper examines the anti-shudder property of automatic transmission fluid (ATF) in terms of evaluation criteria and durability. The anti-shudder property is required for precise slip control around the clutch in that kind of automatic transmission, applications which are currently increasing.To evaluate anti-shudder properties, friction characteristics are measured by modified Low Velocity Friction Apparatus (LVFA), and the data are compared with those from the actual vehicle. The analysis confirms that the occurrence of shudder on the vehicle is closely related to the ratio of the static friction coefficient to the dynamic one measured by modified LVFA.
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