Browse Publications Technical Papers 2020-01-0434
2020-04-14

Simulation and experimental study on lubrication of high speed reducer of electric vehicle 2020-01-0434

In the context of global energy crisis and climate warming, electric vehicle has become the main direction of future vehicles. As an important component that affects the power performance and economy of electric vehicle, the research on high-performance reducer is crucial. The input speed and torque of reducer are getting higher because the improvement of electric vehicle drive motor and the cooling and lubrication problems caused by these changes need to be solved. So the design of lubrication system design is crucial to the high speed reducer performance of electric car. This paper introduces the theory of smoothed particle hydrodynamics (SPH) method and gives the analytical expressions of particle deceleration, velocity and position. In this way, we simulate five working conditions of the reducer under high rotation speed: straight, uphill, downhill, left-heel and right-heel to study the internal flow field distribution of electric vehicle reducer and design some experiments to verify the effectiveness of the method. The results show that the SPH method can well describe the internal lubricating oil flows of reducer. The number of particles per unit time through the bearing is calculated to evaluate the lubrication performance of bearings and the results indicate that the lubrication of each bearing is great, meanwhile, the amount of lubricating oil on both sides of the coaxial bearing is similar and the bearing life is consistent. Finally, the efficiency experiment of the reducer is carried out, and the results show that the efficiency of the reducer meets the requirements, and the lubrication system design is reasonable.

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