Piston for vehicle disc brake and manufacturing method thereof
AssigneesNissin Kogyo Co., Ltd., Shinshu University
InventorsMinoru OKAMOTO, Yohei TAKAHASHI, Susumu ARAI, Miyoka UEDA
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Abstract
A piston has a piston main body including an aluminum alloy, and a covering layer formed on the outer surface of the piston main body, and the covering layer has a first plating layer including an iron-phosphorous alloy, and a second plating layer including a nickel-phosphorous alloy formed on the first plating layer.
Claims10
A piston for a vehicle disc brake, the piston being accommodated via a piston seal in a cylinder hole formed in a caliper body of the vehicle disc brake so as to be movable in a disc shaft direction, the piston comprising:
- a piston main body made of aluminum alloy;
- and
- a covering layer formed on an outer surface of the piston main body,
- wherein the covering layer includes a first plating layer made of iron-phosphorous alloy and a second plating layer made of nickel-phosphorous alloy, the second plating layer being formed on the first plating layer.
A method for manufacturing a piston for a vehicle disc brake, the piston being accommodated via a piston seal in a cylinder hole formed in a caliper body of the vehicle disc brake so as to be movable in a disc shaft direction, the method comprising the steps of:
- forming a first plating layer made of iron-phosphorous alloy on an outer surface of a piston main body made of aluminum alloy using electrolytic plating, the outer surface having undergone zincate treatment;
- and
- forming a second plating layer made of nickel-phosphorous alloy on a surface of the first plating layer using electroless plating.
Dependencies are inferred from the claim text.