Basic Theory And Finite Element Analysis Of The Multi-gear Pump

The multi-gear pump is a new type hydraulic power component based on the theory of the common external gear rotary pump.The strong points of the multi-gear pump are balanced radial hydraulic pressure on the center wheel, uniformity of flow rate, large displacement, low noise and small volume and so on.The common gear pump has such merits as simple structure, low cost, insensitive oil pollution etc., but it has such demerits as high flow pulsation, unbalanced radial hydraulic pressure, strong noise and so on.The multi-gear pump ultimately solves some important problems such as unbalanced radial force and high flow pulsation of the common gear pump.After synthetically analyzing performance characteristic of the common external gear rotary pump, this dissertation profoundly researches into the basic structure principle of the multi-gear pump, meshing point displacement, alternating rule and flow characteristic of two conditions multi-gear pump.Moreover, flow characteristic has been smulation analysed, smulation result conforms to the theory analysis.All demonstrates that flow characteristic of the multi-gear pump is better than common gear pump.And analyzing statics characteristic of the multi-gear pump demonstrates that radial hydraulic pressure, meshing force and resultant force are balanced on the center wheel.The solid prototype of the multi-gear pump which is established by tridimensional software Solidworks designs to realize the gear pairs simulating assemble, motion simulation and dynamic characteristic analysis. Cosmosmotion has been used to simulate meshing and analyse motion of the multi-gear pump.It proves theory analysis and lays the foundation for optimization of the main body construction, analyzing flow field and desiging prototype of the multi-gear pump to use finite element analysis software ANSYS and ANSYS Workbench to calculate andanalyse the statics and dynamic characteristic of the multi-gear pump's main body--shell and gears,based on the solid prototype of the multi-gear pump .