A traction coefficient formula for EHL line contacts operating in the linear isothermal region

Higashitani, Yuko; Kawabata, Sanemasa; Björling, Marcus; Almqvist, Andreas

doi:10.1016/j.triboint.2023.108216

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…The primary aim of tribological analysis is often to reduce friction and wear between moving surfaces by promoting a lubricating film (Larsson, 1997). Most machines constitute of moving tribological components like, e.g., rolling element bearings, gears, and cams, and these operate under lubricated conditions in order to minimize losses due to friction and wear (Higashitani et al, 2023). Such non-conforming tribological components are expected to operate in the elastohydrodynamic lubrication (EHL) regime, which is in contrast to conformal contacts that operate in the hydrodynamic lubrication (HL) regime (Prajapati and Tiwari, 2019b).…”

Section: Introductionmentioning

confidence: 99%

An assessment of the effect of surface topography on coefficient of friction for lubricated non-conformal contacts

Prajapati,

Hansen,

Björling

2024

Front. Mech. Eng.

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Determining an accurate state of lubrication is of utmost importance for the precise functionality of machine elements and to achieve elongated life and durability. In this work, a homogenized mixed-lubrication model is developed to study the effect of surface topographies on the coefficient of friction. Various measured real surface topographies are integrated in the model using the roughness homogenization method. The shear-thinning behavior of the lubricant is incorporated by employing the Eyring constitutive relation. Several Stribeck curves are generated to analyze the effect of roughness lays and root mean square (RMS) roughness on the coefficient of friction. The homogenized mixed lubrication model is validated against experimental rolling/sliding ball-on-disc results, and a good agreement between simulated and experimental coefficient of friction is found.

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Section: Introductionmentioning

confidence: 99%

An assessment of the effect of surface topography on coefficient of friction for lubricated non-conformal contacts

Prajapati,

Hansen,

Björling

2024

Front. Mech. Eng.

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“…Turturro et al [18] developed a tribo-dynamic model performed mixed lubrication analysis by considering valve train dynamic, contact kinematics and tribological conditions. The prediction formula of traction coefficient in linear isothermal region at low SRR (slide-to-roll ratio) has been developed by Higashitani et al [19].…”

Section: Introductionmentioning

confidence: 99%

“…It can be said from the above outlined literature that cam/roller follower system used in valve-train and diesel-injection cams has been extensively analyzed on both an experimental and numerical levels. However, in most of the papers [3,4,6,[8][9][10][15][16][17][18][19] with the notable exception [11][12][13][14], the coupling between pin-roller and cam-roller contacts were not considered. However, in the real situation, the contact conditions between cam/ roller interface are highly depend on pin-roller traction that causes a variation in slippage between cam/roller follower interface [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of mixed-EHL traction coefficient between cam-roller follower interface under different operating conditions

Prajapati

Prakash

2023

Eng. Res. Express

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In heavy duty vehicles, high power density (power throughput/ weight) is desired to achieve the high fuel efficiency. The increasing demand of high power output results in harsh operating conditions (high load, high surface temperature) in which tribological components such as cam/roller follower are enforced to operate. The traction between cam-roller interface highly depends on the contact conditions between roller-pin interface, and the slippage between roller-pin interface may leads to high friction coefficient between cam/roller follower. In this work, a simplified mixed-EHL model is developed to study the traction between the cam/roller follower interface by considering coupling between roller-pin and cam-roller contacts. The develop mixed-EHL model is validated with published results in order to verify the correctness of the model. It is found that slide-to-roll ratio (SRR) increases with an increase in load torque. The effect of surface roughness on performance parameters is presented. Surface maps of SRR, lambda ratio and asperity load ratio for feasible range of maximum contact load and cam speed are also discussed.

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A traction coefficient formula for EHL point contacts operating in the linear isothermal region

Higashitani,

Kawabata,

Björling

et al. 2024

Tribology International

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A traction coefficient formula for EHL line contacts operating in the linear isothermal region

Cited by 3 publications

References 33 publications

An assessment of the effect of surface topography on coefficient of friction for lubricated non-conformal contacts

An assessment of the effect of surface topography on coefficient of friction for lubricated non-conformal contacts

Study of mixed-EHL traction coefficient between cam-roller follower interface under different operating conditions

A traction coefficient formula for EHL point contacts operating in the linear isothermal region

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