Mechanism and reduction of windage power losses for high speed herringbone gear

Abstract

With the objective of reducing windage power losses (WPL) in herringbone gears, WPL experiments involving the use of a shroud are conducted. Based on computational fluid dynamics (CFD), a herringbone gear numerical model is established. Based on the renormalization group (RNG) k–ε two-equation turbulence model and dynamic mesh technique, the features of flow field distribution around the gear; mechanism of reduction of WPL; shroud installation distance, coverage, and installation position; and influence law of WPL are analyzed. The CFD and experimental results, which exhibit good consistency, are used to infer the WPL behavior with respect to the input parameters.

Splash lubrication for an orthogonal face gear using numerical investigation integrating image processing

“…For gears, this energy dissipation results from different types of effects including churning, [4][5][6] pumping, [7][8][9] impulse, [10][11][12] and windage. [13][14][15] For splashlubricated gears, the interaction of the gears with a primary fluid (lubricating oil) causes churning and pumping effects, while the interaction with a second fluid (air) results in windage effects. As a consequence, the overall no-load losses of the splash-lubricated gears are the sum of the churning, pumping, and windage power losses.…”

Investigation of Spatial Symmetry Error Measurement, Evaluation and Compensation Model for Herringbone Gears

“…As an important transmission component, herringbone gears are widely used in high-speed, heavy-duty, and high-power transmission systems such as aviation and vessel transmission equipment and other mechanical transmission areas because of their advantages in transmission stability and strong bearing capacity [4][5][6]. Therefore, high accuracy in the manufacture of herringbone gears is increasingly required [7][8][9][10]. Even more, the spatial symmetry of herringbone gears directly affects transmission errors, transmission efficiency and service life, which are significant for transmission systems [11,12].…”