A method for manufacturing a ball bearing, notably for a butterfly valve in an aeronautical environment
AssigneesSKF Aerospace France S.A.S, Liebherr-Aerospace Toulouse SAS
InventorsGwénolé Le Jeune, Yves Maheo, Jérôme Rocchi
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Abstract
The manufacturing method notably includes a step (110) for sintering steel powder (10), the chemical composition of which includes, in mass percent, 2.3% of carbon, 4.2% of chromium, 7% of molybdenum, 6.5% of tungsten, 10.5% of cobalt and 6.5% of vanadium, so as to obtain a sintered steel (12) and shaping of the sintered steel (12), for forming a bearing ring (18).
Claims8
A method for manufacturing a ball bearing, including:
- sintering a steel powder, the chemical composition of which includes in mass percent, 2.3% of carbon, 4.2% of chromium, 7% of molybdenum, 6.5% of tungsten, 10.5% of cobalt and 6.5% of vanadium, so as to obtain a sintered steel and
- shaping the sintered steel, to form a bearing ring.
A ball bearing, including an annular outer ring and an annular inner ring substantially coaxial with each other, and balls extending radially between the outer ring and the inner ring, wherein at least one of the outer and inner rings is in sintered steel, the chemical composition of which includes, in mass percent 2.3% of carbon, 4.2% of chromium, 7% of molybdenum, 6.5% of tungsten, 10.5% of cobalt and 6.5% of vanadium.
A butterfly valve, notably for an application in aeronautics, including:
- a conduit body with a circular section, and
- a valve of circular shape mating that of the conduit body section, the valve being rotatable around a pivot connection of an axis diametrically crossing the circular section of the conduit body, wherein the pivot connection includes at least one ball bearing including:
- an annular outer ring and an annular inner ring substantially coaxial with each other, and
- balls extending radially between the outer ring and the inner ring, at least one of the outer and inner rings being in sintered steel, the chemical composition of which includes, in mass percent 2.3% of carbon, 4.2% of chromium, 7% of molybdenum, 6.5% of tungsten, 10.5% of cobalt and 6.5% of vanadium.
Dependencies are inferred from the claim text.