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US 9,541,144 B2Granted
Vehicular disc brake rotor and manufacturing method of vehicular disc brake rotor
AssigneeAkebono Brake Industry Co., Ltd.
InventorsYoshiyuki Sugai, Katsuji Seki, Takuya Takada
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Abstract
A vehicular disc brake rotor is provided with a cast-iron base, a nitrogen diffusion layer formed on the cast-iron base, a nitrogen compound layer formed on the nitrogen diffusion layer, and an iron oxide layer including Fe3O4 and formed on the nitrogen compound layer. In a burnish and a first re-burnish of a “Passenger car-Braking device-Dynamometer test procedures” (which is based on JASO C 406:2000), a change ratio of a frictional coefficient between the burnish and the first re-burnish is 10% or less.
Claims8
A vehicular disc brake rotor comprising:
- a cast-iron base;
- a nitrogen diffusion layer formed on the cast-iron base;
- a nitrogen compound layer formed on the nitrogen diffusion layer;
- and
- an iron oxide layer including Fe3O4 and formed on the nitrogen compound layer,
- wherein the iron oxide layer configures a frictional surface, the frictional surface having a pore area ratio of an area with pores to an entire area of the frictional surface being 15% or less, and
- wherein, in a burnish and a first re-burnish, a change ratio of a frictional coefficient between the burnish and the first re-burnish is 10% or less.
4 more elements
Dependencies are inferred from the claim text.