Friction Characteristics of Controlled-Slip Differential Lubricants

Haviland, M. L.; Goodwin, Malcolm C.; Rodgers, J. J.

doi:10.4271/660778

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…When the gradient of the friction coefficient with relative speed is negative, the system's comprehensive damping effect is negative, which can easily cause the system to be unstable and then cause the self-excited judder. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Based on the conclusion, many scholars have concentrated on the influencing factors of clutch friction coefficient. Li et al 23 analyzed the influence of friction materials on clutch judder through the comparative analysis of 18 kinds of frictional lining specimens.…”

Section: Introductionmentioning

confidence: 99%

“…will affect the friction coefficient, which further affects the self-excited judder. [8][9][10][11][12][13][14][15][16][17][23][24][25][26][27][28][29][30] In addition, some scholars have also studied the influence of other parameters on the self-excited judder. Yamada and Ando 18 established an equivalent dynamic model of the lock-up clutch and its rear driveline, and mainly analyzed the influence of driveline damping on stability.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on friction-induced judder of vehicle driveline based on a nonlinear friction model

Chang

Xia

Pang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Due to friction characteristics of clutch, the driveline is prone to cause a judder during vehicle starting, and then to cause the vehicle body to vibrate, which affects driving quality. In order to analyze the judder phenomenon, a nonlinear numerical friction model based on the Gaussian friction model is established in this paper. For the driveline of a front-wheel-drive vehicle, a five-degree-of-freedom (5DOF) lumped parameter model including a nonlinear friction element is established. The complex mode of the driveline during the clutch in slip condition is calculated. The key parameters affecting the driveline stability are analyzed. The self-excited judder and pressure-induced judder of the driveline are numerically simulated, and the corresponding causes are analyzed. The nonlinear friction torque of the clutch is also calculated. Furthermore, the effects of the key parameters such as the torsional stiffness and damping of the clutch and drive shaft suppressing the self-excited judder and pressure-induced judder are numerically studied respectively. Compared with the widely used Karnopp friction model, the nonlinear numerical friction model established in this paper comprehensively includes the stribeck effect in slip and the friction torque characteristics in stick. The phenomena of the judder and stick-slip of the driveline during vehicle starting are more accurately simulated. The simulation results are in good agreement with the experimental results, which verify the accuracy and effectiveness of the dynamic model including the nonlinear friction element established in this paper.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on friction-induced judder of vehicle driveline based on a nonlinear friction model

Chang

Xia

Pang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…[9][10][11] According to Haviland et al the base oil viscosity is of less importance, and generally it does not affect the additive-dependent friction characteristics. 12 Yamamoto claims that the friction of paper-based wet friction materials increases with increasing viscosity. 13 Shirahama states that dynamic friction increases with increasing viscosity, but that the addition of succinimide leads to a coefficient of friction independent of the viscosity.…”

Section: Haldex Limited-slip Couplingmentioning

confidence: 99%

“…The transmitted torque is then measured by the torque measurement cell (7). The applied normal force is measured by the load cell (12). This is possible because of the slider system (8) which allows the torsion bar and torque cell to move freely in the axial direction.…”

Section: Test Equipmentmentioning

confidence: 99%

Wet clutch transmission fluid for AWD differentials: base fluid influence on friction characteristics

Mäki

Ganemi²,

Olsson³

2005

Tribotest

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During the past few years several electronically controllable automotive transmission systems, where wet clutches are used as intelligent differentials, have emerged in the market. In this type of application the anti-shudder properties of the lubricants are of vital importance. This paper investigates the influence of base fluids on the anti-shudder properties of transmission fluids for wet clutches in all-wheel-drive systems. The investigated all-wheel-drive system featuring a wet multi-plate clutch with a sintered brass-based friction material is described. The test equipment used to determine the frictional characteristics of the transmission fluid is described. The parameters studied include base fluid type and base fluid viscosity. It is shown that the choice of base fluid has no impact on torque capacity, but that the base fluid influences the temperature dependence of the dynamic friction and the anti-shudder properties. It is also shown that the major effect on the friction characteristics is caused by additive effects rather than base fluid effects.

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