Patent ID: 9163633
Filing Date: 2015-10-20
Classification: C22C,F01C,F04C,F05C

Abstract:
1. A vane pump, comprising: a rotor having a plurality of slots formed on an outer circumferential surface thereof; a plurality of vanes, one of the plurality of vanes being slidably inserted into each of the plurality of slots, respectively; and a cam ring configured to receive the rotor therein and having an inner circumferential surface in contact with an end portion of each of the plurality of vanes, wherein each vane is formed of a high speed tool steel, wherein a material of the rotor is a nodular graphite cast iron having an austenite structure including 3.5% to 3.9% of carbon (C), 2.2% to 3.0% of silicon (Si), 0.1% to 0.5% of manganese (Mn), 0.02% or less of sulfur (S), 0.04% or less of phosphorus (P), 0.1% to 0.5% of copper (Cu), 0.1% to 0.3% of molybdenum (Mo), 0.02% to 0.05% of magnesium, and 0.01% to 0.04% of one or more rare earth resources (RE) by weight ratio, with a remainder including iron (Fe), and wherein a material of the cam ring is formed of an alloy cast iron having a tempered martensite structure including 3.0% to 3.3% of carbon (C), 2.0% to 2.5% of silicon (Si), 0.5% to 1.0% of manganese (Mn), 0.05% to 1.0% of chromium (Cr), 0.2% to 0.5% of copper (Cu), 0.1% to 0.3% of phosphorus (P), 0.02% to 0.06% of boron (B), 0.06% to 0.1% of sulfur (S), and 0.4% or more of titanium (Ti), by weight ratio.