Extended-Drain ATF Field Testing in City Transit Buses

Zakarian, J. A.; Schullo, F.J.; Sumiejski, James L.; Vermilya, D.R.

doi:10.4271/2003-01-1985

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…Several methods for rating of aged oil relevant for gear wear protection were developed by various researchers. Some of them include investigation of aged oils from field operation in, 1,11,12,13,14,15,16,17,18,19 ageing, 10,20,21,22,23,24 and from mechanical and tribological ageing using component tests in. 1,11,9,25,26,27,9 The aging of lubricants in combustion engines was frequently analyzed and a multitude of publications was released to the public.…”

Section: Investigation Of Oil Ageingmentioning

confidence: 99%

Test method for determining the scuffing capacity of oils with reduced oil volume

Gerges,

Heipl,

Pfeifer

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Previous studies by several researchers have shown that the aging of the transmission fluid in dual clutch transmissions has a major impact on the wear protection of the highly loaded tribological contacts. Depending on the transmission design, oil sump temperature, transmitted torque, rotational speed and oil volume, the scuffing ability decreases significantly. Since typically only limited quantities of oil from gearbox tests are available to evaluate oil condition with respect to wear protection properties, available analytical standards are currently limited to methods such as viscometry, TAN, elemental analysis, and IR. A test method is presented that can be used to determine the gear scuffing load capacity of transmission fluids with a reduced oil volume. For this purpose, a standard test rig is modified to reduce the test oil volume from 1.25 liters, as specified in the public standards, to 0.5 liters. The applicability of the reduced test oil volume is demonstrated and the remaining scuffing wear protection of several used oil samples from durability testing is presented. A comparison of the tribological results with the chemical oil analysis results shows the advantage of direct testing of the oil's service properties.

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Section: Investigation Of Oil Ageingmentioning

confidence: 99%

Test method for determining the scuffing capacity of oils with reduced oil volume

Gerges,

Heipl,

Pfeifer

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In the magnified view of the clutch housing seen in Figure 3, the friction disc (10) and the separator discs (11) can be seen. The friction disc is connected to the drive shaft (9), and the separator discs are connected to the torsion bar (6).…”

Section: Test Equipmentmentioning

confidence: 99%

“…[4][5][6]9,10 Base fluids are known to influence the expected life of the fluid, due primarily to their resistance to oxidation. 11 The choice of base fluid will also influence the thermal properties of the lubricant. 8 An earlier study of base fluids showed that low viscosity fluids gave better anti-shudder properties than high viscosity fluids, especially at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Wet clutch transmission fluid for AWD differentials: influence of lubricant additives on friction characteristics

Mäki

Ganemi

Höglund

et al. 2006

Lubrication Science

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In recent years, several electronically controllable automotive transmission systems using wet clutches as intelligent differentials have emerged on the market. These applications place great demands on the anti-shudder properties of the transmission fluids used.The aims of this study were (i) to investigate the influence of different additives on the friction characteristics of a transmission fluid for all-wheel drive systems featuring wet multi-plate clutch with a sintered brass-based friction material and, based on this knowledge, (ii) to formulate a new transmission fluid with the desired frictional properties. In addition to excellent anti-shudder properties, the new fluid was required to lubricate hypoid gears under high load. To meet this requirement, it is necessary to add significant amounts of extreme pressure additives to the base oil, which are known to have an unfavourable influence on anti-shudder properties, necessitating the adoption of novel additive technologies.The additives studied include anti-wear additives, friction modifiers, corrosion inhibitors, detergents, antioxidants and extreme pressure additives. This paper shows how different additives affect friction in different ways, and that the interactions between the different additives are important to consider. It was concluded that it is feasible to combine good anti-shudder properties for wet clutches with good lubrication of hypoid gears. Copyright

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Extended-Drain ATF Field Testing in City Transit Buses

Cited by 2 publications

References 3 publications

Test method for determining the scuffing capacity of oils with reduced oil volume

Test method for determining the scuffing capacity of oils with reduced oil volume

Wet clutch transmission fluid for AWD differentials: influence of lubricant additives on friction characteristics

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