Tribological property of plain bearing with low frictional layer

Kagohara, Yukihiko; Takayanagi, Satoshi; Haneda, Shigeya; Fujita, Masahito; Iwai, Yoshiro

doi:10.1016/j.triboint.2009.02.007

Cited by 20 publications

(9 citation statements)

References 2 publications

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“…Whilst these technologies are mutually complimentary in terms of their environmental benefits, their simultaneous use in a tribological context is less well understood, beyond perhaps an appreciation that start-stop can produces conditions of lubricant starvation between contacting surfaces and local temperature rise [6,7]. The use of aluminium as a cylinder facing material in the engine block requires that significant amounts of silicon are introduced into the alloy composition in order to precipitate primary and secondary Si colonies from a saturated matrix to act as the bearing contact surface against the piston ring pack, thus protecting the softer aluminium from scuffing [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The influence of start–stop transient velocity on the friction and wear behaviour of a hyper-eutectic Al–Si automotive alloy

Walker¹,

Kamps²,

Wood³

2013

Wear

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As worldwide automotive ownership is set to exceed 2 billion vehicles by 2030 [1], environmental and economical pressures on the automotive industry mean there is a trend to reduce harmful greenhouse gas emissions whilst simultaneously improving fuel economy. The use of electrical hybrid, start-stop idling and materials light-weighting are some of the technological solutions which can offer efficiency savings, however their combined use in a tribological context is less well understood. Interruption of piston sliding as a result of start-stop technology will simultaneously interrupt fluid film lubrication at the ring/liner interface. This could have implications on the friction and wear behaviour of Al-Si cylinder blocks, where scuffing can be an issue. In order to determine the effect of a start-stop velocity cycles on the lubricated friction and wear behaviour of a hyper-eutectic Al-Si liner, an interrupted reciprocating laboratory tribometer test programme was developed based upon the European Urban Cycle standard. Refined cast iron piston ring segments were slid at 23Hz frequency, 4MPa nominal contact pressure and 25mm stroke length against a conformal honed Alusil cylinder liner segment. Regular velocity interruptions at 60s intervals did not significantly inhibit the dynamic friction behaviour between the liner and the cast-iron piston ring segment, indicating that lubricant additive function was not significantly inhibited. However contact potential and FIB-SIMS depth profiles indicated that antiwear tribo-film thickness was reduced as a result of start-stop cycling. Mass loss from the piston ring was also notably higher as a result of the interruption of elasto-hydrodynamic lubrication causing boundary conditions at re-start and subsequent 2-body abrasion by harder protruding Si particles. Specific wear rates for the Al-Si liner as a result of start-stop velocities were surprisingly lower compared to uninterrupted tests and was believed to be due to faster running-in of the piston ring surface. These results are discussed in terms of the viability of Al-Si as engine materials running start-stop technology.

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Section: Introductionmentioning

confidence: 99%

The influence of start–stop transient velocity on the friction and wear behaviour of a hyper-eutectic Al–Si automotive alloy

Walker¹,

Kamps²,

Wood³

2013

Wear

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“…Depending on the road operating conditions vehicles would have different brake modes and, consequently, different lining life [7,8].…”

Section: Objectivesmentioning

confidence: 99%

Research to longevity brake lines on the exploitations

et al. 2017

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Summary. Brake lines are tested for strength and durability. However, tests of strength are short-term, but tests of durability are durable, since their aim is to assess the effectiveness of the brake linings during operation. Therefore, reduction of time evaluating the durability of brake linings exploitation is urgent. The article describes the results of the research on the longevity of the brake linings of different types of vehicles based on their controllable operation and the method of accelerated estimation of the longevity of brake linings based on the operation of their analogues. ИССЛЕДОВАНИЕ ДОЛГОВЕЧНОСТИ ТОРМОЗНЫХ НАКЛАДОК В ЭКСПЛУАТАЦИИАннотация. Тормозные накладки проверяют на прочность и долговечность. Но, испытания на прочность -кратковременны, а на долговечность -длительны, так как их цель заключается в оценке эффективности работы тормозных накладок в процессе эксплуатации. Поэтому сокращение времени оценки долговечности тормозных накладок в эксплуатации является актуальным. В работе приведены результаты исследований долговечности тормозных накладок различных автотранспортных средств по результатам подконтрольной эксплуатации и метод ускоренной оценки долговечности тормозных накладок по результатам эксплуатации аналога.

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“…Another very important aspect during the operation of sliding bearing is its start-up and subsequent phases of transition from mixed-film lubrication to full-film lubrication, which directly affect the friction torque in the bearing and thus its durability (Bouyer and Fillon 2011). In addition to the well-known and commonly used bearing materials, additional layers are also applied to the surface of the bearing or the journal (Wójcicki and Strzelecki 1999;Kagohara et al 2009). These layers have great potential for reducing friction losses, i.e., they provide lower adhesion forces between the cooperating elements, which translate into favorably lower values of coefficient of friction.…”

Section: Introductionmentioning

confidence: 99%

Impact of Geometry Parameters of a Sliding Surface of a Bearing on Tribological Characteristics of Sliding Bearings

Michalak

2018

Iran J Sci Technol Trans Mech Eng

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One of the characteristic parameters which is important for functioning of a journal bearing is relative clearance which has a direct impact on the bearing performance during an initial run-in period and standard operation. An equally important aspect is the proper selection of journal and bearing materials, as it ensures their proper cooperation, i.e., possibly low coefficient of friction, low resistance to motion and minimal wear. Another important issue is the geometry of the working surface of the bearing, i.e., giving it a proper shape by the use of lubricating microgrooves (micro-channels) which support the formation of an oil film. Forming a sliding surface in such a manner contributes to a better cooperation between the journal and the bearing. The paper presents the results of tribological tests, specifically the impact of the use of two types of lubricating microgrooves, made on the internal surface of the bearing on tribological characteristics. The tests were conducted for journal bearings composed of the bearing coated with casted SnSb12Cu6Pb alloy and the steel journal. During the tests, the friction torque, bearing temperature and voltage drop on the internal resistance of oil film were registered. As a result of the investigation, it was noticed that the use of rounded lubricating microgrooves has a positive effect on the tribological characteristics and can contribute to increasing the load-bearing capacity and durability of the journal bearings.Iran J Sci Technol Trans Mech Eng (2019) 43 (Suppl 1):S595-S602 https://doi.org/10.1007/s40997-018-0181-x( 012 3456789(). ,-volV) (0123456789().,-volV)

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Tribological property of plain bearing with low frictional layer

Cited by 20 publications

References 2 publications

The influence of start–stop transient velocity on the friction and wear behaviour of a hyper-eutectic Al–Si automotive alloy

The influence of start–stop transient velocity on the friction and wear behaviour of a hyper-eutectic Al–Si automotive alloy

Research to longevity brake lines on the exploitations

Impact of Geometry Parameters of a Sliding Surface of a Bearing on Tribological Characteristics of Sliding Bearings

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