US4552057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally insulated piston
Assignee: Osram Sylvania Inc
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Filing: 1983-12-30
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Granted: 1985-11-12
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Expires: 2003-12-30
Abstract
Abstract This invention discloses a thermally insulated piston having a cap portion and a body portion. The cap can be made of metal or ceramic. The cap and body portion are joined together by a brazing alloy. The cap portion can have a groove for receiving the brazing alloy. The ceramic cap can have a retaining band portion in a retaining band groove the band being bonded to the body portion by a brazing alloy. The piston with the ceramic cap can have an interlayer between the cap and body portion, the interlayer being bonded to the cap portion and body portion by a brazing alloy. The interlayer can have an outer knife edge. The body portion has a machined groove adjacent to the cap portion comprised of cells filled with thermal insulating material.
Inventors
- 👤 Howard Mizuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:57
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0085; F02F7/0087; F02F3/00; F02F3/10; F02F3/12; F02B; F02B3/00; F02B3/06; F02B77/00; F02B77/11; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0869; F05C2203/0895; F05C2251/00; F05C2251/04; F05C2251/042
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
149 words
A piston comprising: (a) a cap portion having an outer surface and an inner planar and a periphery surface extending from said inner surface to said outer surface, said periphery surface having a brazing alloy receiving groove therein, (b) a body portion having a substantially circular periphery, said body portion having a recess for receiving said cap portion, said recess having a first surface opposing said inner planar surface of said cap portion, said body portion and said cap portion being joined together by a first brazing alloy positioned in said groove and by a second brazing alloy positioned between said inner planar surface of said cap and said first surface of said recess, said body portion having a cellular portion adjacent to said second brazing alloy comprised of open-ended cells filled with a thermal insulating material said cells being closed by said brazing alloy and said cap portion.
Claim 2
Dependent Claim
149 words
A piston comprising: (a) a cap portion having an outer surface and an inner planar and a periphery surface extending from said inner surface to said outer surface, said periphery surface having a brazing alloy receiving groove therein, (b) a body portion having a substantially circular periphery, said body portion having a recess for receiving said cap portion, said recess having a first surface opposing said inner planar surface of said cap portion, said body portion and said cap portion being joined together by a first brazing alloy positioned in said groove and by a second brazing alloy positioned between said inner planar surface of said cap and said first surface of said recess, said body portion having a cellular portion adjacent to said second brazing alloy comprised of open-ended cells filled with a thermal insulating material said cells being closed by said brazing alloy and said cap portion.
Claim 3
Dependent Claim
12 words
A piston according to claim 1 wherein said cap portion is metal.
Claim 4
Dependent Claim
23 words
A piston according to claim 1 wherein said cap portion and said body portion are constructed of material of matching thermal expansion properties.
Claim 5
Dependent Claim
14 words
A piston according to claim 1 wherein the piston is constructed of cast iron.
Claim 6
Dependent Claim
26 words
A piston according to claim 1 wherein said first and second brazing alloy have a flow temperature of from about 600° C. to about 1000° C.
Claim 7
Dependent Claim
98 words
A piston according to claim 1 wherein said brazing alloys are selected from the group consisting of copper and silver based alloys wherein said alloy are compositions selected from a composition consisting essentially of from about 20% to about 50% by weight copper, from about 5% to about 20% by weight indium, and from about 50% to about 80% by weight silver and a composition consisting essentially of from about 50% to about 80% by weight copper, from about 20% to about 40% by weight of manganese, and from about 1% to about 10% by weight of cobalt.
Claim 8
Dependent Claim
193 words
A piston comprising: (a) a cap portion having an outer surface and an inner planar surface and a periphery surface extending from said inner surface to said outer surface, said periphery surface having a retaining band groove, (b) a retaining band positioned in said retaining band groove and, (c) a body portion having a substantially circular periphery, said body portion having a recess for receiving said cap portion, said recess having a first surface opposing said inner planar surface of said cap portion and a second surface opposing a portion of said periphery surface of said cap portion having a brazing alloy receiving groove therein, said body portion and said cap portion being joined together by a first brazing alloy positioned in said alloy receiving groove and metallurgically bonding said body portion and said retaining band and by a second brazing alloy positioned between said inner planar surface of said cap and said first surface of said recess, said body portion having a cellular portion adjacent to said second brazing alloy comprised of open-ended cells filled with a thermal insulating material said cells being closed by said brazing alloy and said cap portion.
Claim 9
Dependent Claim
193 words
A piston comprising: (a) a cap portion having an outer surface and an inner planar surface and a periphery surface extending from said inner surface to said outer surface, said periphery surface having a retaining band groove, (b) a retaining band positioned in said retaining band groove and, (c) a body portion having a substantially circular periphery, said body portion having a recess for receiving said cap portion, said recess having a first surface opposing said inner planar surface of said cap portion and a second surface opposing a portion of said periphery surface of said cap portion having a brazing alloy receiving groove therein, said body portion and said cap portion being joined together by a first brazing alloy positioned in said alloy receiving groove and metallurgically bonding said body portion and said retaining band and by a second brazing alloy positioned between said inner planar surface of said cap and said first surface of said recess, said body portion having a cellular portion adjacent to said second brazing alloy comprised of open-ended cells filled with a thermal insulating material said cells being closed by said brazing alloy and said cap portion.
Claim 10
Dependent Claim
14 words
A piston according to claim 7 wherein said cap portion is a ceramic material.
Claim 11
Dependent Claim
29 words
A piston according to claim 8 wherein the ceramic material of said cap portion is selected from the group consisting of partially stabilized zirconia, silicon nitride, cordierite, and alumina.
Claim 12
Dependent Claim
14 words
A piston according to claim 7 wherein said body portion is constructed of metal.
Claim 13
Dependent Claim
15 words
A piston according to claim 10 wherein said body portion is constructed of cast iron.
Claim 14
Dependent Claim
80 words
A piston according to claim 7 wherein said brazing alloys are selected from the group consisting of a composition consisting essentially of, in percent by weight, from about 50% to about 80% copper, from about 5% to about 20% indium, and from about 50% to about 80% silver; and a composition consisting essentially of in percent by weight from about 50% to about 80% copper, from about 20% to about 40% manganese, and from about 1% to about 20% cobalt.
Claim 15
Dependent Claim
14 words
A piston according to claim 7 wherein said retaining band is constructed of steel.
Claim 16
Dependent Claim
27 words
A piston according to claim 7 wherein a second brazing alloy metallurgically bonds said inner planar surface of said cap to said first surface of said recess.
Claim 17
Dependent Claim
21 words
A piston according to claim 14 wherein a steel disc is intermediate between said second brazing alloy and said cap portion.
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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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |