Patent US4662319A successfully refreshed from Google Patents.
US4662319A
Expired / Lapsed
US
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Structurally lightened piston utilizable especially in an internal combustion engine
Assignee: D'ETUDES DE MACHINES THERMIQUES SEMT SA Ste
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Filing: 1985-12-06
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Granted: 1987-05-05
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Expires: 2005-12-06
Abstract
Abstract The piston for an internal combustion engine, consisting of a piston head (1) and a body (2) of monobloc or two-piece construction, the head bearing upon the body (2) via at least two circular bearing surfaces (4, 5), the body (2) having a bearing part (6) receiving an articulation part (10) rigidly attached to the end of a connecting rod (3) and said bearing part (6) having on its piston head side a wall (7) forming a bearing whose bearing surface (8) is continuous, is structurally lighter in that the portion of its body (2) connecting the wall (7) to the bearing surfaces (4, 5) is formed of at least two thin, truncated conical partitions (11, 12) whose center lines (13, 14, 15, 16) are rectilinear, each of said partitions bearing upon a separate one of the circular bearing surfaces (4, 5).
Inventors
- 👤 Philippe Ayoul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:29
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/0069; F02F3/003; F02F3/0076; F02F3/16; F02F3/20; F02F3/22; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A piston for an internal combustion engine, the piston comprising a head and a separate body having an upper end provided with at least two concentric circular radially spaced bearing surfaces and a lower end, the lower end terminating in a bearing part for receiving an articulation part rigidly mounted on the end of a connecting rod, the bearing part comprising a wall having a concave bearing surface, the head being mounted on the upper end of the body via said at least two concentric circular bearing surfaces, the body further comprising means for connecting said wall to the concentric circular bearing surfaces, said connecting means comprising at least two thin partitions having a basically inverted truncated conical shape with straight center lines, each of said partitions having a base portion bearing on a separate one of said concentric circular bearing surfaces.
Claim 2
Dependent Claim
142 words
A piston for an internal combustion engine, the piston comprising a head and a separate body having an upper end provided with at least two concentric circular radially spaced bearing surfaces and a lower end, the lower end terminating in a bearing part for receiving an articulation part rigidly mounted on the end of a connecting rod, the bearing part comprising a wall having a concave bearing surface, the head being mounted on the upper end of the body via said at least two concentric circular bearing surfaces, the body further comprising means for connecting said wall to the concentric circular bearing surfaces, said connecting means comprising at least two thin partitions having a basically inverted truncated conical shape with straight center lines, each of said partitions having a base portion bearing on a separate one of said concentric circular bearing surfaces.
Claim 3
Dependent Claim
39 words
A piston as in claim 1, wherein for any given axial cross section of the piston, the points of intersection of the center lines of the partitions are located on the articulation part side of the concave bearing surface.
Claim 4
Dependent Claim
48 words
A piston as in claim 1, wherein the intersections of the partition center lines with the concave bearing surface determine successive segments of a curve, the ratio of the length of the shortest segment to the length of the longest segment being greater than or equal to 1:10.
Claim 5
Dependent Claim
21 words
A piston as in claim 1, wherein the body further comprises an annular partition linking together the concentric circular bearing surfaces.
Claim 6
Dependent Claim
70 words
A piston according to claim 4, wherein said annular partition in conjunction with two of the truncated conical partitions and the wall of the bearing part defines a first annular chamber, and said annular partition in conjunction with the piston head defines a second annular chamber, said first and second annular chambers being part of a cooling system for the piston and communicating with one another via coolant flow orifices.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |