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US 12,338,885 B2Granted
Gear component
AssigneeHitachi Construction Machinery Co., Ltd.
InventorsKazuya Nonomura, Kunihiro Fukuda, Yuuki Tahara
Life of this patent
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Abstract
This invention provides a gear component with high hardness of a surface layer in a tooth root and with the excellent bending fatigue strength. The gear component of the invention comprises a surface layer of a tooth root including a region in which the area percentage of carbides is 10% or lower and the number density of carbides is 6 pieces/10 μm2 or lower.
Claims3
A gear component comprising a tooth section having a tooth root, a tooth tip, and a tooth surface between the tooth root and the tooth tip and consisting of a super-carburized steel material,
- wherein the tooth root, the tooth surface, and the tooth tip each have a carbide layer comprising carbides diffused and deposited on a surface layer,
- the area percentage of carbides is 10% or lower and the number density of carbides is 6 pieces/10 μm2 or lower in at least a part of the carbide layer of the tooth root, and
- thickness of the carbide layer of the tooth root is larger than thickness of the carbide layer of the tooth surface and thickness of the carbide layer of the tooth tip.
Dependencies are inferred from the claim text.