Patent US4677901A successfully refreshed from Google Patents.
US4677901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced piston for internal combustion engines and associated method of construction
Assignee: Honda Motor Co Ltd
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Filing: 1984-11-21
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Granted: 1987-07-07
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Expires: 2004-11-21
Abstract
Abstract A fiber-reinforced piston for internal combustion engines, comprising a molded body of inorganic fiber forming a top land and a ring region of the piston. The molded body has a content of granulated fiber having larger particles of a particle diameter less than 100 mesh in an amount of not more than 10 weight percent with respect to the total amount of fiber used, and a light alloy matrix fills and is combined with the molded body of inorganic fiber.
Inventors
- 👤 Keisuke Ban
- 👤 Akimasa Daimaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:41
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/10; F; F02; F02F; F02F3/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256; Y10T29/49259
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
260 words
A fiber reinforced piston for an internal combustion engine comprising a top land and a ring region provided with an uppermost ring groove, said top land and said ring region being defined by a reinforced part of the piston formed by a matrix metal reinforced with inorganic fibers, said reinforced part of the piston being circularly symmetrical around an axis of the piston and forming an annulus around a top portion of the piston, said reinforced part having a cross-section, in a plane containing the axis of the piston, of substantially rectangular shape except for the uppermost ring groove, said piston having an upper crown surface, said reinforced part being formed as a cylindrical shell having an upper radial surface which is continuously formed in said upper crown surface, a lower radial surface, an inner cylindrical surface joining said upper and lower radial surfaces and an outer cylindrical surface having a radius equal to that of the outer cylindrical surface of the piston, said uppermost ring groove having an upper annular side wall surface, a lower annular side wall surface and an annular bottom surface connecting said upper and lower annular side wall surfaces, said inner cylindrical surface of the reinforced part having a smaller radius than that of the annular bottom surface of the uppermost ring groove, said reinforced part extending in the axial direction of the piston from the upper crown surface to a postion below said lower annular side surface of the uppermost ring groove, whereby said uppermost ring groove is totally defined within said reinforced part.
Claim 2
Dependent Claim
260 words
A fiber reinforced piston for an internal combustion engine comprising a top land and a ring region provided with an uppermost ring groove, said top land and said ring region being defined by a reinforced part of the piston formed by a matrix metal reinforced with inorganic fibers, said reinforced part of the piston being circularly symmetrical around an axis of the piston and forming an annulus around a top portion of the piston, said reinforced part having a cross-section, in a plane containing the axis of the piston, of substantially rectangular shape except for the uppermost ring groove, said piston having an upper crown surface, said reinforced part being formed as a cylindrical shell having an upper radial surface which is continuously formed in said upper crown surface, a lower radial surface, an inner cylindrical surface joining said upper and lower radial surfaces and an outer cylindrical surface having a radius equal to that of the outer cylindrical surface of the piston, said uppermost ring groove having an upper annular side wall surface, a lower annular side wall surface and an annular bottom surface connecting said upper and lower annular side wall surfaces, said inner cylindrical surface of the reinforced part having a smaller radius than that of the annular bottom surface of the uppermost ring groove, said reinforced part extending in the axial direction of the piston from the upper crown surface to a postion below said lower annular side surface of the uppermost ring groove, whereby said uppermost ring groove is totally defined within said reinforced part.
Claim 3
Dependent Claim
46 words
A fiber reinforced piston as claimed in claim 1 wherein said matrix metal is a lightweight alloy and said inorganic fibers are ceramic fibers having a composition of about one-half by weight of Al 2 O 3 and about one-half by weight of SiO 2 .
Claim 4
Dependent Claim
38 words
A fiber reinforced piston as claimed in claim 2 wherein said ceramic fibers have a composition of 47.3 wt. % of Al 2 O 3 , 52.3 wt. % of SiO 2 and the remainder of miscellaneous components.
Claim 5
Dependent Claim
19 words
A fiber reinforced piston as claimed in claim 2 wherein said light alloy matrix is a magnesium alloy matrix.
Claim 6
Dependent Claim
30 words
A fiber reinforced piston as claimed in claim 2 wherein parts of said piston other than said reinforced part are formed of the metal used for forming said reinforced part.
Claim 7
Dependent Claim
19 words
A fiber reinforced piston as claimed in claim 2 wherein said inorganic fibers have an average diameter of 2.8μ.
Claim 8
Dependent Claim
20 words
A fiber reinforced piston as claimed in claim 2 wherein said inorganic fibers are in the form of short fibers.
Claim 9
Dependent Claim
68 words
A fiber reinforced piston as claimed in claim 2 wherein said piston further has a middle ring groove located below said uppermost ring groove and a middle land disposed between said uppermost and middle ring grooves for connection of the latter, said reinforced part extending in the axial direction of the piston to a position where said reinforced part defines at least a part of said middle land.
Claim 10
Dependent Claim
37 words
A fiber reinforced piston as claimed in claim 8 wherein said reinforced part further extends to a position below said middle ring groove whereby said uppermost and middle ring grooves are totally defined within the reinforced part.
Claim 11
Dependent Claim
30 words
A fiber reinforced piston as claimed in claim 1 wherein parts of said piston other than said reinforced part are formed of the metal used for forming said reinforced part.
Claim 12
Dependent Claim
19 words
A fiber reinforced piston as claimed in claim 1 wherein said inorganic fibers have an average diameter of 2.8μ.
Claim 13
Dependent Claim
20 words
A fiber reinforced piston as claimed in claim 1 wherein said inorganic fibers are in the form of short fibers.
Claim 14
Dependent Claim
68 words
A fiber reinforced piston as claimed in claim 1 wherein said piston further has a middle ring groove located below said uppermost ring groove and a middle land disposed between said uppermost and middle ring grooves for connection of the latter, said reinforced part extending in the axial direction of the piston to a position where said reinforced part defines at least a part of said middle land.
Claim 15
Dependent Claim
37 words
A fiber reinforced piston as claimed in claim 13 wherein said reinforced part further extends to a position below said middle ring groove whereby said uppermost and middle ring grooves are totally defined within the reinforced part.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |