Effects of hydraulic oil and lubricant additives on dynamic friction properties under various reciprocating sliding conditions

Katō, Susumu; Sasaki, Shinya

doi:10.1007/s40544-019-0296-0

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…After a lower friction level for amplitudes up to 2.5 mm, a relatively constant friction level between 2.5 and 10 mm occurs, followed by a recess between 20 and 30 mm. According to the studies of (Kato and Sasaki, 2019) on various lubricant additives, it was possible to achieve lower friction levels in the amplitude range of 0.1–1 mm on a tribo-tester, depending on the actual lubricant composition. Although the lubricant properties used for the present shock absorber are unknown, the occurred phenomenon might be of similar nature.…”

Section: Suspension Friction Measurementsmentioning

confidence: 99%

Friction of a MacPherson suspension system at various load cases

Deubel

Prokop

2022

Journal of Vibration and Control

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In the current vehicle development process, the suspension friction is commonly treated as a constant force, while other suspension parameters, such as stiffness and damping, are quantified according to the actual kinetic state. Even though this simplification might be approximately true for many suspension variants, the theoretical background and the experiments conducted in this study indicate that the suspension friction of a MacPherson system is strongly subject to change depending on the forces and moments acting at the tyre contact patch. On the other hand, there is only a limited research basis quantifying to what extent suspension friction is affecting vehicle behaviour during various driving events. Therefore, assessments of whether an often-urged friction reduction is appropriate in the context of developmental efforts and benefits are equally limited. The first reasonable step is to accurately determine the actual amount of suspension friction regarding various boundary conditions and load situations, which currently is not constituted in literature. Hence, within the frame of the present study, the friction under various influences is investigated for a compact car, beginning at the full suspension and with special focus on lateral forces and combined wheel deflection states. While certain influences (engine state, excitation amplitude in a limited range) seem to be of minor importance, the suspension friction is strongly affected by various forces and moments at the tyres and by the wheel deflection level, whereas the lateral force dependence is mostly distinctive.

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Section: Suspension Friction Measurementsmentioning

confidence: 99%

Friction of a MacPherson suspension system at various load cases

Deubel

Prokop

2022

Journal of Vibration and Control

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“…Among them, the friction-reducing and anti-wear additives play an indispensable role in alleviating the friction and wear of the contact area by forming a physical adsorption/deposition film and/or tribochemical reaction film on the rubbing surfaces [28][29][30][31][32][33][34]. The traditional friction-reducing and anti-wear additives are usually composed of organic polar materials, such as organic molybdenum compounds [35][36][37], polymers [38], alcohols [39], esters [40][41][42], amine compounds [43], organic salts [44], ionic liquids, and their derivatives [45][46][47][48][49][50]. The strong polarity allows them to form neat adsorption films on the metallic rubbing surfaces to reduce the friction and wear of friction pairs.…”

Section: Introductionmentioning

confidence: 99%

Applications of carbon quantum dots in lubricant additives: a review

Tang

Zhang

2021

J Mater Sci

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Advances in lubricants are vital to the pursuit of energy efficiency and sustainable development. It is well known that the essence of lubricating oil is lubricant additives, especially the friction-reducing and anti-wear additives. Carbon quantum dots (CQDs), a novel zero-dimensional carbon-based nanomaterial, have attained growing expectations in material and chemical sciences because of their extraordinary properties such as low toxicity and environmentally friendly, high chemical and thermal stability, and good designability. Since their discovery, CQDs have shown great potential in many applications including sensors, medicine, photovoltaic devices, biology, and tribology. The latest application of CQDs as the high-performance friction-reducing and antiwear additives has garnered increasing attention. With the in-depth study, CQDs have gradually exhibited their excellent tribological properties, especially acted as additives in lubricating base oils. This paper has reviewed the progress in the research and development of CQDs-based lubricant additives by introducing lots of successful applications of CQDs-based additives in the present work and then highlighted the friction-reducing and anti-wear property, superiority, as well as the lubrication mechanism of CQDs as an additive, along with some discussion on challenges and perspectives in this significant and promising field. Finally, we offered a series of suggestions for developing the next-generation high-performance CQDs-based lubricant additives.

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“…Our review of the literature indicated that there are two main approaches on how to evaluate the tribological behavior of hydraulic cylinders. The first one is by mathematical simulation/modeling [16][17][18][19][20], whereas the second one is by developing new lab-scale test procedures [21][22][23][24]. Currently, both approaches have certain limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Lab-scale tests are more applicable for material development, as long as they correlate well with the component behavior. Unfortunately, until now lab-scale tribological tests [21][22][23] focus only on the frictional aspect, which determines the performance of hydraulic cylinders, but not on the wear which dictates the lifetime of this component. Moreover, the lab-scale tests that do measure wear [24] use simplified contacts and different contact geometries that do not closely resemble the actual contact.…”

Section: Introductionmentioning

confidence: 99%

High Performance Accelerated Tests to Evaluate Hard Cr Replacements for Hydraulic Cylinders

et al. 2021

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To prolong the lifetime of hydraulic cylinders, a wear-resistant low-friction surface is required. Until now, hard Cr coatings were the best materials for this. However, in recent years, there has been an increasing pressure on the manufacturing of hard Cr plating and plated products, because of environmental and health hazards. The replacement of these coatings by alternatives has not been highly successful yet, because it requires extensive component testing, which is costly and time-consuming and thus not appropriate for material development. For this reason, there is a high need to develop tribological methods that simulate hydraulic cylinders’ component-testing closely. In addition, these new methods should also provide additional information (e.g., friction evolution) that can assist in the further development and optimization of alternative coatings. Having the above in mind and building on an existing method from the American Society for Testing and Materials (ASTM G133), a new test method that allows users to test directly on hydraulic cylinders was developed. This method can provide a relative ranking of both the wear resistance and frictional performance of alternative coatings in direct comparison to state-of-the-art hard Cr. Importantly, the method is repeatable and has a much shorter test duration than full-scale component tests, thereby accelerating material development significantly.

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Effects of hydraulic oil and lubricant additives on dynamic friction properties under various reciprocating sliding conditions

Cited by 8 publications

References 16 publications

Friction of a MacPherson suspension system at various load cases

Friction of a MacPherson suspension system at various load cases

Applications of carbon quantum dots in lubricant additives: a review

High Performance Accelerated Tests to Evaluate Hard Cr Replacements for Hydraulic Cylinders

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