US4636285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing wear resistant sliding member
Assignee: Mazda Motor Corp
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Filing: 1985-05-28
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Granted: 1987-01-13
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Expires: 2005-05-28
Abstract
Abstract A sliding member having a number of oil retaining pores is manufactured by forming a hard plating layer on a metal base, forming a masking resist film on the hard plating layer by exposure to light and development, forming a number of pores in the hard plating layer by effecting electrolytic etching at a current density of 50 to 600 A/dm 2 , dissolving said masking resist film and removing the same, and forming a hard ceramic film on the hard plating layer by vapor phase plating.
Inventors
- 👤 Kouji Tarumoto
- 👤 Jun Miyata
- 👤 Koji Yagii
- 👤 Satoshi Nanba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/14; C23; C23C; C23C14/00; C23C14/02; C23C14/021; C25D; C25D5/00; C25D5/48; C25D7/00; C25D7/10; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/043
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A method of manufacturing a sliding member having a number of oil retaining pores comprising the steps of forming a hard plating layer, having a surface hardness not less than Hv 700, on a metal base, forming a masking resist film on the hard plating layer by exposure to light and development, forming a number of oil-retaining pores in the hard plating layer by effecting electrolytic etching at a current density of 50 to 600 A/dm 2 , an edge portion of each of said oil-retaining pores having a shoulder angle not less than 100 degrees, dissolving said masking resist film and removing the same, and forming a hard ceramic film, having a surface hardness not less than Hv 1000, on the hard plating layer by vapor phase plating.
Claim 2
Independent Claim
129 words
A method of manufacturing a sliding member having a number of oil retaining pores comprising the steps of forming a hard plating layer, having a surface hardness not less than Hv 700, on a metal base, forming a masking resist film on the hard plating layer by exposure to light and development, forming a number of oil-retaining pores in the hard plating layer by effecting electrolytic etching at a current density of 50 to 600 A/dm 2 , an edge portion of each of said oil-retaining pores having a shoulder angle not less than 100 degrees, dissolving said masking resist film and removing the same, and forming a hard ceramic film, having a surface hardness not less than Hv 1000, on the hard plating layer by vapor phase plating.
Claim 3
Dependent Claim
43 words
A method of manufacturing a sliding member as defined in claim 1 in which said hard plating is selected from the group consisting of chromium plating, nickel-phosphorus plating, and chromium-molybdenum plating, and said hard ceramic film is of titanium nitride or titanium carbide.
Claim 4
Dependent Claim
36 words
A method of manufacturing a sliding member as defined in claim 1 further comprising a step of forming a titanium layer of 0.5 to 10μ thick between said hard plating layer and the hard ceramic layer.
Claim 5
Dependent Claim
21 words
A method of manufacturing a sliding member as defined in claim 1 in which said vapor phase plating is ion plating.
Claim 6
Dependent Claim
20 words
A method of manufacturing a sliding member as defined in claim 1 in which said vapor phase plating is sputtering.
Claim 7
Dependent Claim
26 words
A method of manufacturing a sliding member as defined in claim 1 in which said sliding member is a rotor housing for a rotary piston engine.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |