Abstract
Improving vehicle transmission efficiency and reducing vehicle fuel consumption is currently one of the main objectives in the automotive field. Reducing gear churning power losses has significant influence on the decreasing vehicle fuel consumption. Based on the two phase flow theory, a 2D two-phase model of the simplified hypoid gear is established to predict the churning losses in different conditions, the VOF method is introduced to track the volume fraction of the free surface, a standard k-e model is also built to calculate complex turbulence. The oil distributions at the different rotational speed, the different immersion depth and the different viscosity as well as the churning losses of the hypoid gear are obtained and discussed in detail. In general, the churning power losses increase with the increase of the speed, the immersion depth and the viscosity, while the rotational speed shows the greatest influence on the churning losses. It is hoped that this investigation will be helpful in automotive industry applications.
Highlights
The internal transmission efficiency of the rear axle of a car directly affects the oil consumption of the whole vehicle
The churning power losses increase with the increase of the speed, the immersion depth and the viscosity, while the rotational speed shows the greatest influence on the churning losses
These results show that the rotational speed has impact on effect extent of the viscosity on churning losses
Summary
The internal transmission efficiency of the rear axle of a car directly affects the oil consumption of the whole vehicle. They developed a new approach to predict churning power losses of ordinary gears [2]. The oil distribution of the hypoid gear at the different conditions and the influencing factors of the churning losses such as the speed, the immersion depth and the viscosity are obtained and discussed. It is hoped that this investigation will be helpful for the deepening of our understanding on the oil consumption of the whole vehicle
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