Patent ID: 6602358
Filing Date: 2003-08-05
Classification: C21D,C22C,F16D,Y02P

Abstract:
An outer race for a constant velocity joint, including a cup and an involute serration and having improved anti-flaking properties and shaft strength, said outer race comprising a steel material by weightcarbon: 0.45 to 0.59%, silicon: 0.2 to 0.4%, manganese: 0.15 to 0.45%, sulfur: 0.005 to 0.15%, molybdenum: 0.1 to 0.35% boron: 0.0005 to 0.005% aluminum: 0.015 to 0.05%; and titanium: 0.015 to 0.03% and, in addition, nitrogen: limited to not more than 0.005% (inclusive of 0%), chromium: limited to not more than 0.10% (inclusive of 0%), phosphorus: limited to not more than 0.020% (inclusive of 0%), and oxygen: limited to not more than 0.0020% (inclusive of 0%), with the balance consisting of iron and unavoidable impurities, the proportion of an effective case depth in track grooves of the cup being 0.25 to 0.45 in terms of the ratio of the effective case depth t to the wall thickness of the cup w, t/w, the proportion of the effective case depth of the involute serration in its end being 0.20 to 0.50 in terms of the ratio of the effective case depth t to the radius r, t/r.