Patent ID: 8092091
Filing Date: 2012-01-10
Classification: C22C,F16C,Y10S

Abstract:
1. A valve for controlling a recirculation exhaust gas flow rate in an internal combustion engine with an EGR system, comprising, a bearing made of a sintered Cu alloy having a composition consisting of, by mass %, having a structure in which free graphite is dispersed and distributed into the base of a Cu—Ni—Sn—P based solid solution; and a shaft made of an stainless steel; wherein, the bearing has a substantially cylindrically-shaped hole for supporting the shaft, the shaft reciprocally slides in the hole of the bearing, thermal expansion coefficients of the shaft and the bearing are in the range of 15×10 wherein a maximum abrasion depth of the shaft is between 0.001 mm and 0.002 mm, when the valve is subjected an abrasion test where a number of revolutions is 3000 revolutions/minute, a reciprocating distance of the shaft is 10 mm, a number of reciprocation of the stainless shaft is 150 times/minute, and a test time is 500 hours under a condition in which a temperature ranges from 420 to 435° C.