Articles comprising thermally stable, grain-refined alloys
US-2024026556-A1 · Jan 25, 2024 · US
Piston for vehicle disc brake and manufacturing method thereof
US2018003252A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018003252-A1 |
| Application number | US-201615547445-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 18, 2016 |
| Priority date | Feb 19, 2015 |
| Publication date | Jan 4, 2018 |
| Grant date | — |
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Abstract
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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.
First claim
Opening claim text (preview).
1 . 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. 2 . The piston for a vehicle disc brake according to claim 1 , wherein the second plating layer further includes 10 to 30 volume percent of resin particles and the resin particles are made of polytetrafluoroethylene (PTFE). 3 . The piston for a vehicle disc brake according to claim 1 , wherein the first plating layer has a film thickness of 1 to 15 μm and the second plating layer has a film thickness of 1 to 15 μm. 4 . 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. 5 . The method for manufacturing a piston for a vehicle disc brake according to claim 4 , wherein a plating solution including an iron compound, a phosphinic acid compound, and organic acid is used in the process of forming the first plating layer. 6 . The method for manufacturing a piston for a vehicle disc brake according to claim 5 , wherein the organic acid is glycine and L-ascorbic acid. 7 . The method for manufacturing a piston for a vehicle disc brake according to claim 4 , wherein the second plating layer further includes 10 to 30 volume percent of resin particles and the resin particles are made of polytetrafluoroethylene (PTFE). 8 . The piston for a vehicle disc brake according to claim 2 , wherein the first plating layer has a film thickness of 1 to 15 μm and the second plating layer has a film thickness of 1 to 15 μm. 9 . The method for manufacturing a piston for a vehicle disc brake according to claim 5 , wherein the second plating layer further includes 10 to 30 volume percent of resin particles and the resin particles are made of polytetrafluoroethylene (PTFE). 10 . The method for manufacturing a piston for a vehicle disc brake according to claim 6 , wherein the second plating layer further includes 10 to 30 volume percent of resin particles and the resin particles are made of polytetrafluoroethylene (PTFE).
Assignees
Inventors
Classifications
Use of incorporated material in the solution or dispersion, e.g. particles, whiskers, wires · CPC title
Coating with nickel, cobalt or mixtures thereof with phosphorus or boron (C23C18/50 takes precedence) · CPC title
Aluminium · CPC title
Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating · CPC title
- C25D3/562Primary
containing more than 50% by weight of iron or nickel or cobalt · CPC title
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Frequently asked questions
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- What does patent US2018003252A1 cover?
- 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.
- Who is the assignee on this patent?
- Nissin Kogyo Kk, Univ Shinshu
- What technology area does this patent fall under?
- Primary CPC classification C25D3/562. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jan 04 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).