Numerical Simulation And Application Research On Rotor Oil Pump

As an important part of automobile lubrication system, oil pump gets a great progress as the automobile industry. But there is still a comparatively large gap between China and foreign countries in assembly process, equipment, machining precision and detection method. In order to increase the ability and speed of R&D (research and development), improve product quality, finite element numerical simulation will be used in pump optimum design process, which may give a new way for native oil pump industry to solve the above problems.This article is based on the project"dynamics and structure simulation analysis of BF6M1013 series diesel engine oil pump". The research of this paper is divided into the flowing parts:(1) With considering resistance and friction of oil, using keywords of LS-DYNA to control contact-collision process parameters, the rotor- contact-collision process of rotor oil pump moving parts was simulated. As a result, lots of detail data were obtained, such as effective stress nephogram while one rotor was engaging with another, rotor shearing strength isobaric nephogram, rotor pressure isobaric nephogram and alternative effective stress-time graph. Through the data, stress concentration was observed. Compared simulation results under steady working condition with practical situation, the cause why the oil pump damaged was got.(2) Basing on simulation result and technical requirement, shape of the rotor tooth was changed into circular arc-epicycloid equidistant curve. The numerical simulation of the improved rotor was done by using LS-DYNA. The result showed that stress changed smoothly and stress concentration was also released after optimized.(3) Geometry modeling of the rotor oil pump body was established and modal analysis of pump body was made. The result included the frequencies of resonance, stress and strain during low running speed. It showed that the resonance frequencies were far from excited frequency of oil pump moving parts, and the corresponding whirling speed was much lower than the working speed of oil pump. It meant that the resonance would hardly happen. It gave the method for optimization design.