Friction Characteristics Compatibility of DEXRON®-III/MERCON® ATFs for Japanese Automatic Transmissions

Matsuo, Kohei; Saeki, Shin; Ito, Fumitaka

doi:10.4271/972929

Cited by 4 publications

(1 citation statement)

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“…Shudder is known as a stick-slip phenomenon and is related to the friction coefficientvelocity (μ − v) characteristics. Positive dμ/dv in the μ − v curve is required to prevent shudder [5,18]. The Japanese automobile standards organization (JASO) had specified a sweep low-velocity friction apparatus (LVFA) method based on a stepwise measurement that is designed to measure frictional characteristics in a continuously changing velocity.…”

Section: Revision Of Atf Anti-shudder Property Standardsmentioning

confidence: 99%

A new method to evaluate the overall anti-shudder property of automatic transmission fluids – multiple parameters spider chart evaluation

Zhao

Neville

Morina

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part J:

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Formulating automatic transmission fluids (ATFs) can pose some diverse challenges. The friction response should ensure a smooth engagement process with no shudder in the automatic transmission. Friction, as a function of velocity, must show a smooth and positive/plateau curve as velocity increases in the μ − v plots. In this study, the friction behaviour of some basic additive systems for ATFs was assessed by using a variable speed friction test (VSFT) rig. The test was used to mimic the clutch engagement process and to evaluate the friction response of different formulations. The focus was anti-shudder properties of the designated formulations. A new method of evaluating VSFT results was developed to assess the overall ATF friction behaviour in conjunction to the common friction-velocity curve analysis. X-ray photoelectron spectroscopy was used to check the different surface conditions before and after the test.

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Section: Revision Of Atf Anti-shudder Property Standardsmentioning

confidence: 99%