The gear dynamic and static performance analysis and structure optimization

Gear pump has the distinctive Cargo bike of simple structure, easy manufacture, small size, long life, low purchase price, strong self-priming capacity, high operating reliability, low sensitivity to the oil, more convenient to maintain. At the same time, due to the structure characteristics of the gear pump is symmetrical, so it can realize high speed rotation. These advantages make the external gear pump is widely used in mining equipment, metallurgical equipment, construction machinery, machine tool equipment, Folding electric bikes industries such as shipbuilding and all kinds of engineering and agricultural machinery. In addition, the gear pump in the hydraulic transmission system and lubrication system is widely applied. But its structure of the gear pump has also led to the trapped oil phenomenon, it with non-uniform flow, good flow ripple, high working noise and emissions do not adjust the shortcomings. In this paper the flow pulsation of the pump and the pump body burst failure to carry out the research, and obtained some research results. Paper first starts with the basic theory, the formula of flow pulsation of external gear pump is derived, the gear pump flow pulsation theoretically under the influence of which parameters as well as the relationship between these parameters. Then using FLUENT fluid analysis software, based on dynamic grid, on the basis of the internal flow field of the gear pump are analyzed in numerical simulation, get the internal gear pump pressure field and velocity field, the analysis of the internal gear pump leak and trapped oil phenomenon, through the simulation test under different rotational speed, the gear pump.