As a substantial power loss, the high speed automotive hydraulic power steering outputs normally exceeds the system actual demands, which is one of the practical difficulties of that kind of power steering. A new type of variable displacement of double-action vane pump based on the study of a patent is described in this issue, which could be applied in the auto steering pump. Considering of the severe energy cost in existing hydraulic power steering system, the recommended pump could compensate the rate. Based on the pump principle, the interior structure design of the pump could be improved to achieve saving energy. A rational pump structure is designed for lower energy lost according to the research on the characteristics of the variable mechanism under various speed, working conditions of the improved vane pump structure and the energy saving theory. Compared to the traditional double-action vane pump, the new vane could not only keep the advantages such as balance of radial suffer force for rotor but also change the displacement automatically according to different speeds. The transformation regulation applying on the variable mechanism floating block under different rotating speeds is analyzed derived according to the engineering dynamics principles and the dynamics model of variable framework is set up in the same way. Some MATLAB simulations are utilized to show a theoretical feasibility proof of the project.
Analysis of Pressure Pulsation and Vibration in Variable Displacement Vane Pump for Power Steering System(Fluids Engineering)