A Study of Additive Effects on ATF Frictional Properties Using New Test Methods

Nakada, Takanori; Nomura, Takao; Yoshioka, Tatsuo; Nonoyama, Minoru

doi:10.4271/902150

Cited by 17 publications

(4 citation statements)

References 7 publications

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“…3 Friction coefficient as a function of dimensionless sliding velocity more active at higher temperatures. The large effect of additives on static friction was also found by Nakada et al [8].…”

Section: Resultssupporting

confidence: 73%

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Engagement behaviour of a paper-based wet clutch Part 2: Influence of temperature

Holgerson

Lundberg

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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To increase comfort, performance and fuel economy, a more careful optimization of automatic transmissions is needed. Of special interest is how the temperature influences the engagement characteristics. In order to increase the level of knowledge in this area, a wet clutch test rig including a drive torque and inertia was used. The temperature and the developed energy were varied in order to investigate their influence on the characteristics of an engagement. As a consequence the influence of instant temperature, maximum temperature and instant normal force was also studied. Some of the most important conclusions of the investigation are that both the dynamic and static friction coefficients slightly decrease and the engagement time increases with increasing temperature. It was also found that the static and dynamic friction coefficients are not influenced by energy if the instant temperature is the same. An important parameter that describes the risk of stick-slip is the quotient between the static and dynamic friction. It was found that this quotient decreases with increasing temperature, and thus the risk of stick-slip is also supposed to decrease.

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Section: Resultssupporting

confidence: 73%

“…They created a degradation curve to be used as a support for clutch design which was based upon the maximum temperature of an engagement. Yoshizawa et al [4] and Nakada et al [5] saw that unwanted stick-slip decreased at high temperatures and suggested that this was due to changes to more favourable friction characteristics.…”

Section: Introductionmentioning

confidence: 99%

Engagement behaviour of a paper-based wet clutch Part 2: Influence of temperature

Holgerson

Lundberg

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Furthermore, the performance criteria must be met, including, for instance, the friction behavior of wet clutches, which is shaped by the use of friction modifiers [7]. Previous studies have shown that adding detergent and dispersants, which are also used for oxidation stability, significantly increases the CoF for organic friction lining [8][9][10]. Friction modifiers, conversely, mostly consist of fatty acids, aliphatic, or phosphate esters and cause an inherent reduction in the static CoF [9,11].…”

Section: Motivation and State Of The Artmentioning

confidence: 99%

Influence of Water Contamination, Iron Particles, and Energy Input on the NVH Behavior of Wet Clutches

Wirkner,

Baese,

Lebel

et al. 2023

Lubricants

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The driving comfort and safety of the automotive powertrain are significantly related to the performance, lifetime, and functionality of the lubricant. The presented study focuses on investigating the performance loss of the lubricant due to water contamination resulting from environmental influences and iron particles originating from the wear of different machine elements. The main purpose is to determine critical factors that contribute to the degradation of the lubricant, and increase the tendency to NVH behavior, leading to adverse comfort losses to the respective user. Therefore, this performance loss is evaluated by test rig-based analysis of the friction behavior of wet clutches. Due to physical adsorption, a significant impact of water and iron contamination on the degradation of the lubricant is found, while the influence of the energy input is secondary.

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“…Alizadeh [4] studied the frictional models of the wet cone clutch system, and the frictional behavior was described by the Stribeck curve. Nakada [5] evaluated the static friction coefficient and the stick-slip properties. Zhang [6] established a dynamic model of friction pair bearing capacity, friction torque, 2 of 13 and clutch shift engagement, and the relationship between damping coefficient and dynamic friction coefficient was revealed.…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Friction Performance Test of a New Conical Groove Friction Disks in Wet Clutch

Wang

Yang

2021

Applied Sciences

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Wet clutch transmits its power by the friction torque between friction and separate disks. Conical groove friction disk is a new attempt in Wet clutch. Its configurations allow significant enhancement of torque delivery performances, compared with the traditional plane friction disk. In order to study the frictional performances of the conical groove friction configuration, the friction coefficient calculation model of conical groove friction disk was established, and experimental investigation was used to measure the friction coefficient under sliding velocity conditions. The influence of configuration parameters: cone heights and angles on friction coefficients were evaluated in a typical variable speed test. The results indicated that configuration parameters can affect friction performance in a constant speed period. The equivalent radius can directly describe the friction region of a conical groove friction disk. The constant speed test can be a useful method.

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A Study of Additive Effects on ATF Frictional Properties Using New Test Methods

Cited by 17 publications

References 7 publications

Engagement behaviour of a paper-based wet clutch Part 2: Influence of temperature

Engagement behaviour of a paper-based wet clutch Part 2: Influence of temperature

Influence of Water Contamination, Iron Particles, and Energy Input on the NVH Behavior of Wet Clutches

Structural Design and Friction Performance Test of a New Conical Groove Friction Disks in Wet Clutch

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