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US 12,180,995 B2Granted
Crankshaft and method of manufacturing the same
AssigneeNippon Steel Corporation
InventorsTatsuhiko Abe, Yoko Sueyasu
Life of this patent
Estimating the term…
Abstract
A crankshaft with improved fatigue strength is provided. A crankshaft 10 includes journals 11, pins 12, and fillets 14, each fillet 14 having a residual stress distribution where the residual stresses are compressive residual stresses from the surface down to a depth of at least 300 μm, the maximum value of the compressive residual stress being not lower than 1000 MPa, the surface roughness Rz being lower than 3.00 μm.
Claims5
A crankshaft comprising a journal, a pin, and a fillet,
- the fillet having a residual stress distribution where a residual stress is a compressive residual stress from a surface down to a depth of at least 300 μm, a maximum value of the compressive residual stress being not lower than 1000 MPa, a surface roughness Rz being lower than 3.00 μm.
Dependencies are inferred from the claim text.