US4538562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine part
Assignee: NGK Insulators Ltd
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Filing: 1983-05-06
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Granted: 1985-09-03
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Expires: 2003-05-06
Abstract
Abstract The disclosed engine part uses an integral combination of a ceramic member and a metallic member, which ceramic member has a metallized layer formed on one side surface thereof, and a metallic buffer is bonded to the metallized layer so as to be disposed between the ceramic member and the metallic member.
Inventors
- 👤 Minoru Matsui
- 👤 Nobuo Tsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:02
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/10; F02F3/12; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; F01; F01L; F01L7/00; F01L7/14; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0603; F02B23/0696; F02F7/00; F02F7/0085; F02F7/0087; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/123; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/345; C04B2237/348; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/70; C04B2237/708; C04B2237/72; C04B2237/76; F02B2023/0612; F02B23/0645; F02B23/0654; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0895; F05C2251/00; F05C2251/04; F05C2251/042; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12347; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12861; Y10T428/12951
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
115 words
A piston for an internal combustion engine comprising a metallic piston, a ceramic piston crown, a metallized layer formed on one side of said ceramic piston crown, a plated layer applied to said metallized layer, a metallic buffer disk having an effective thickness for reducing thermal stresses between said metallic piston and said piston crown, said metallic buffer disk being bonded to said metallic plated layer, said metallic buffer disk having a coefficient of thermal expansion which is equivalent to or smaller than that of the ceramic piston crown, whereby said metallic piston is integrally joined to the ceramic piston crown with the metallic buffer disk, the plated layer and the metallized layer disposed therebetween.
Claim 2
Dependent Claim
115 words
A piston for an internal combustion engine comprising a metallic piston, a ceramic piston crown, a metallized layer formed on one side of said ceramic piston crown, a plated layer applied to said metallized layer, a metallic buffer disk having an effective thickness for reducing thermal stresses between said metallic piston and said piston crown, said metallic buffer disk being bonded to said metallic plated layer, said metallic buffer disk having a coefficient of thermal expansion which is equivalent to or smaller than that of the ceramic piston crown, whereby said metallic piston is integrally joined to the ceramic piston crown with the metallic buffer disk, the plated layer and the metallized layer disposed therebetween.
Claim 3
Dependent Claim
29 words
A piston for an internal combustion engine as set forth in claim 1, wherein a joint between the metallic buffer disk and the metallic piston is a brazed portion.
Claim 4
Dependent Claim
30 words
A piston for an internal combustion engine as set forth in claim 1, wherein a joint between the metallic buffer disk and the metallic piston is a diffusion bonded portion.
Claim 5
Dependent Claim
29 words
A piston for an internal combustion engine as set forth in claim 1, wherein a joint between the metallic buffer disk and the metallic piston is a welded portion.
Claim 6
Dependent Claim
30 words
A piston for an internal combustion engine as set forth in claim 1, wherein a joint between the metallic buffer disk and the metallic piston is an insert cast portion.
Claim 7
Dependent Claim
29 words
A piston for an internal combustion engine as set forth in claim 1, wherein a joint between the metallic buffer disk and the metallic piston is a bolted portion.
Claim 8
Dependent Claim
32 words
A piston for an internal combustion engine as set forth in claim 1, wherein the ceramic piston crown is made of zirconia ceramics and the metallic piston is made of cast iron.
Claim 9
Dependent Claim
58 words
A piston for an internal combustion engine as set forth in claim 1, wherein the metallic buffer disk has a coefficient of thermal expansion which is smaller than 14×10 -6 (°C. -1 ) and the metallic buffer disk comprises a material selected from the group consisting of titanium, titanium alloys, ferritic stainless steel, iron-chromium-nickel alloys, and iron-nickel alloys.
Claim 10
Dependent Claim
47 words
A piston for an internal combustion engine as set forth in claim 1, wherein an area of bonding between the metallic buffer disk and the plated layer applied to the metallized layer is larger than an area of bonding between the metallic buffer and the metallic piston.
Claim 11
Dependent Claim
39 words
A piston for an internal combustion engine as set forth in claim 1, wherein the metallic buffer disk comprises a material selected from the group consisting of titanium and titanium alloys, and the ceramic piston crown comprises zirconia ceramics.
Claim 12
Dependent Claim
116 words
A tappet for an internal combustion engine comprising: a tappet body; a ceramic member for contacting with a cam as a contact surface; a metallized layer bonded to said ceramic member; a plated layer applied to said metallized layer; a metallic buffer disk having an effective thickness for reducing thermal stresses between said tappet body and said ceramic member, said metallic buffer disk being bonded to said plated layer, said metallic buffer disk having a coefficient of thermal expansion which is equivalent to or smaller than that of the ceramic member; and said tappet body is integrally joined to said ceramic member with the metallic buffer disk, the plated layer, and the metallized layer disposed therebetween.
Claim 13
Dependent Claim
116 words
A tappet for an internal combustion engine comprising: a tappet body; a ceramic member for contacting with a cam as a contact surface; a metallized layer bonded to said ceramic member; a plated layer applied to said metallized layer; a metallic buffer disk having an effective thickness for reducing thermal stresses between said tappet body and said ceramic member, said metallic buffer disk being bonded to said plated layer, said metallic buffer disk having a coefficient of thermal expansion which is equivalent to or smaller than that of the ceramic member; and said tappet body is integrally joined to said ceramic member with the metallic buffer disk, the plated layer, and the metallized layer disposed therebetween.
Claim 14
Dependent Claim
58 words
A tappet for an internal combustion engine as set forth in claim 11, wherein the metallic buffer disk has a coefficient of thermal expansion which is smaller than 14×10 -6 (°C. -1 ) and the metallic buffer disk comprises a material selected from the group consisting of titanium, titanium alloys, ferritic stainless steel, iron-chromium-nickel alloys, and iron-nickel alloys.
Claim 15
Dependent Claim
38 words
A tappet for an internal combustion engine as set forth in claim 11, wherein the metallic buffer disk comprises a material selected from the group consisting of titanium and titanium alloys, and the ceramic member comprises zirconia ceramics.
Claim 16
Dependent Claim
84 words
A tappet for an internal combustion engine comprising: a zirconia ceramic member for contacting with a cam as a contact surface; a metallized layer bonded to said zirconia ceramic member; a plated layer applied to said metallized layer; a metallic buffer disk comprising a material selected from the group consisting of titanium and titanium alloys; and a tappet body, wherein said tappet body is integrally joined to said ceramic member with the metallic buffer disk, the plated layer, and the metallized layer disposed therebetween.
Claim 17
Dependent Claim
84 words
A tappet for an internal combustion engine comprising: a zirconia ceramic member for contacting with a cam as a contact surface; a metallized layer bonded to said zirconia ceramic member; a plated layer applied to said metallized layer; a metallic buffer disk comprising a material selected from the group consisting of titanium and titanium alloys; and a tappet body, wherein said tappet body is integrally joined to said ceramic member with the metallic buffer disk, the plated layer, and the metallized layer disposed therebetween.
Claim 18
Dependent Claim
92 words
A tappet for an internal combustion engine comprising: a ceramic member for contacting with a cam as a contact surface; a metallized layer bonded to said ceramic member; a plated layer applied to said metallized layer; a metallic buffer disk bonded to said plated layer, said metallic buffer disk having a coefficient of thermal expansion which is smaller than that of the ceramic member; and a tappet body wherein said tappet body is integrally joined to said ceramic member with the metallic buffer disk, the plated layer, and the metallized disposed therebetween.
Claim 19
Dependent Claim
92 words
A tappet for an internal combustion engine comprising: a ceramic member for contacting with a cam as a contact surface; a metallized layer bonded to said ceramic member; a plated layer applied to said metallized layer; a metallic buffer disk bonded to said plated layer, said metallic buffer disk having a coefficient of thermal expansion which is smaller than that of the ceramic member; and a tappet body wherein said tappet body is integrally joined to said ceramic member with the metallic buffer disk, the plated layer, and the metallized disposed therebetween.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |