Vane pump and profile determination method inside cam ring constituting the same

摘要

The present invention relates to a vane pump capable of increasing a theoretical discharge amount by reducing wear of the vane pump and increasing a volume of a vane pump chamber and a method for determining an inner profile of a cam ring constituting the same. The method for determining the inner profile of the cam ring of the vane pump including a cam ring accommodated in a pump housing, a rotor accommodated rotatably with respect to a rotational shaft in the cam ring, and a plurality of vanes coupled to the rotor to discharge fluid, in which the cam ring has a ring shaped inner profile varied between a max radius Rmax and a minimum radius Rmin in a circumferential direction with respect to the rotational shaft, the method includes: determining a maximum radius point; determining a cycloid curve passing through the maximum radius point; determining an inclined tangent line having one side connected to the cycloid curve with a tangential curvature; and determining a circular arc connected to the other side of the tangent line with a tangential curvature to pass through a minimum radius point.