Power and energy ratios in mechanical CVT drive control

Effect of polymer structure and chemistry on viscosity index, thickening efficiency, and traction coefficient of lubricants

“…[13] in which low traction coefficient fluid found to improved overall low-speed efficiency of a hydraulic motor by 5-16% via transitioning out of the boundary lubrication region at a lower Stribeck/Hersey number. As a result, low traction is preferable in hydraulic fluids [12][13][14] to decrease shearing forces and high traction is preferable in continuously variable transmissions fluids to avoid slippage while minimizing contact friction for energy efficiency [15][16][17]. Good traction characteristics in a lubricants are essential to achieving a balance between film thickness and resistance to shear to ensure both wear protection and energy efficiency [18].…”