Energy Saving Study On A New Variable Displacement Of Double-action Vane Pump

With the rapid development of automotive industry recently, people are requiring higher quality for the comfort and safety of cars. In the 80s of last century, hydraulic power steering system is used in cars domestically and abroad in order to improve the driving safety and comfort. However both domestic and overseas power steering system have serious energy loss: the entire system will cost 3 percent energy of the engine, but only 40 percent of it will transfer to consumed energy, while the other 60 percent of the energy will be wasted. Also it will increase the heat of the hydraulic system, reduce the using life, produce noise and increase exhaust emission.The number of cars in the world is about 0.75 billion at present and is still keeping increasing. With the tremendous contribute to people, cars are causing serious damage to the circumstances, most of them are related with the cars using mineral fuel. Therefore, reducing the fuel consuming and exhaust emission is playing an important role in improving the quality of the air. According to the estimation, the fuel used by cars is about 40 percent out of the total usage of fuel for the world. So if we can minimize the fuel cost by cars, it will definitely have a positive impact on the energy position. The research of energy saving in cars technology is always ongoing. However in the previous research, the researchers put more attention on the consume of engine and drive system, cost a lot to save little fuel within one hundred kilometer, while paid little attention on auxiliary system, e.g. steering system.Based on the related literature collection, a new variable displacement of double-action vane pump is presented in this thesis which is applied in auto steering pump etc. With respect to the serious energy cost of present hydraulic power steering system, the proposed vane steering pump has the ability of rate compensation. Designed according to the pump structure, it can reduce energy loss by changing the interior structure of the pump. Based on the research of the energy saving theory and structure improvement of vane pump and the working conditions and characteristics of the variable frameworks under different speeds, a reasonable structure is designed to reduce the machine energy cost. As compared with the traditional double-action vane pump, the new vane can not only keep the advantage of balance of radial suffer force for rotor but also change its exhaust quantity automatically according to different rotate speeds.The transformation rule of the variable framework floating block under different rotate speeds is analyzed and the dynamics model of variable framework is derived according to the engineering dynamics principles. The dynamic estimation of the variable framework utilizing ADAMS is also analyzed, and figures of the dynamic parameters can be obtained. Concerning with the variable effects under different rotate speeds, the theoretical flux output equation is provided; and some MATLAB simulations are given upon this to give a theoretical feasibility proof of the project. According to the real machining ability and level of technology of Dalian Hydraulic Component Company, a sample machine of variable displacement of double-action vane pump is designed and produced based on the new variable theory, and some tests have been done on the synthetic test-bed in Dalian Hydraulic Component Company. The practice feasibility of the double-action vane pump is validated from the experimental perspective.