Experimental Investigation of Laser Surface Texturing for Reciprocating Automotive Components

Ryk, G.; Kligerman, Y.; Etsion, I.

doi:10.1080/10402000208982572

Cited by 429 publications

(292 citation statements)

References 12 publications

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“…Reciprocatingslider testing also showed reduced friction for welllubricated cases. Other results, though, suggested that the texturing could be harmful in poorly-lubricated situations [40,41].…”

Section: Engine Friction Reduction By Surface Textures or Coatingsmentioning

confidence: 92%

Overview of automotive engine friction and reduction trends–Effects of surface, material, and lubricant-additive technologies

Wong

Tung²

2016

Friction

274

140

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Abstract:The increasing global environmental awareness, evidenced by recent worldwide calls for control of climate change and greenhouse emissions, has placed significant new technical mandates for automotives to improve engine efficiency, which is directly related to the production of carbon dioxide, a major greenhouse gas. Reduction of parasitic losses of the vehicle, powertrain and the engine systems is a key component of energy conservation. For engine efficiency improvement, various approaches include improvements in advanced combustion systems, component system design and handling-such as down-sizing, boosting, and electrification-as well as waste heat recovery systems etc. Among these approaches, engine friction reduction is a key and relatively cost-effective approach, which has been receiving significant attention from tribologists and lubricant-lubrication engineers alike. In this paper, the fundamentals of friction specific to the environments of engine components tribology are reviewed, together with discussions on the impact of developing vehicle powertrain technologies, surface and material technologies, as well as lubricant and additive technologies on promises of continuing friction and wear reduction trends. The international accords on climate change require further gains in fuel efficiency and energy sustainability from all industry sectors including those in the automotive and the broader internal combustion engine industries, and the latter encompass off-highway, power generation, marine, and rail industries as well. This paper focsuses on friction reduction in mainly automotive engines, however.The paper starts with a clarification of the common descriptors of mechanical losses and friction in the engine, followed by the topic of lubrication fundamentals such as lubrication regimes. Then the lubrication of the contacting surfaces in each of the major engine subsystems is discussed in turn. These subsystems include the piston assembly: ring-pack/liner, piston-skirt/liner, and piston-pin/connecting-rod contacts; connecting rod and crankshaft bearings; and the valvetrain subsystem. The relative contributions to total friction from the various subsystems are discussed, with the piston-assembly contributing to about half of the total friction. The remainder of the friction comes from the crankshaft, connecting rod, camshaft bearings, and the valvetrain oscillating parts. The bearings are in predominantly hydrodynamic lubrication, in contrast to the valvetrain oscillating components, which are characterized to be mostly in the mixed/boundary lubrication regimes.Despite the title of the paper, a section on emerging powertrain technologies-including that of combustion in gasoline and diesel engines-is also given in the context of the trend towards clean and efficient propulsion systems. The impact of these developing technologies on the reduction of friction and parasitic losses via component, material, and lubricant deisgn will be discussed. These technologies include gasoline direct injection (GD...

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Section: Engine Friction Reduction By Surface Textures or Coatingsmentioning

confidence: 92%

Overview of automotive engine friction and reduction trends–Effects of surface, material, and lubricant-additive technologies

Wong

Tung²

2016

Friction

274

140

View full text Add to dashboard Cite

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“…One possible solution, which is beyond the scope of the current paper, is to locally modify the surface texture in the regions with high boundary friction. Such custom made topography (applied on the ring [39] or on the liner [40]) can decrease boundary friction without increasing oil consumption. Figure 14 (a) shows the friction coefficient during engine operation (µ f = f f /W ).…”

Section: Resultsmentioning

confidence: 99%

Cavitation induced starvation for piston-ring/liner tribological conjunction

Chong

Teodorescu

Vaughan

2011

Tribology International

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The study investigates the mechanism of ring-liner lubrication in the vicinity of the top and bottom dead centres of an internal combustion engine. Predicting lubricant transient behaviour is critical when the inlet reversal leads to thin films and inherent metal-to-metal interaction. It was found that the cavitation, which is located at the trailing edge of the contact before reversal, briefly survives after reversal as a confined bubble at the leading edge. This depletes the film promoting starvation. Several algorithms were compared. It is concluded that the lubricant film is thinner than initially thought.Keywords: Piston ring, lubrication, tribology, Elrod cavitation algorithm, cavitation, starvationViscostiy-temperature index (-) T Temperature

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“…For the tribo-pairs of metals lubricated by oil, several studies under controlled laboratory conditions have been performed in order to analyze the effect of area density of dimples on the coefficient of friction. Several experimental works show that the area density of dimples in the range of 5-13% is preferable for friction reduction, and the area density of dimples of above 20 % usually causes increasing the friction coefficient value [17,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of tribological properties of laser textured hardened tool steels

et al. 2016

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In this paper the laser surface texturing (LST) technology as one of the methods of tribological properties modifying of mating steel surfaces is analysed. The area density of dimple-like depression along with the dimple diameter are the only main factors which significantly influence the friction coefficient value, therefore the effect of different values of area density of dimples: 6 %, 11 % and 16 % on the contact coefficient of friction was analysed. Surface textures were manufactured on the planar areas of compression platens (90MnCrV8 tool steel) using a pulsed-beam laser. The values of coefficients of friction were obtained via a ring compression test. Test sample compression was realized in lubrication-free and hydrodynamic regime. A significant improvement of tribological properties in contact steel areas was experimentally observed in both friction regimes. The results of experiments showed that by applying of surface texturing with defined shape and dimensions of dimples and lubricating oil at the same time, the coefficient of friction value can be reduced to about of 75%.

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Experimental Investigation of Laser Surface Texturing for Reciprocating Automotive Components

Cited by 429 publications

References 12 publications

Overview of automotive engine friction and reduction trends–Effects of surface, material, and lubricant-additive technologies

Overview of automotive engine friction and reduction trends–Effects of surface, material, and lubricant-additive technologies

Cavitation induced starvation for piston-ring/liner tribological conjunction

Evaluation of tribological properties of laser textured hardened tool steels

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