US4662326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cast piston with fiber-reinforcement
Assignee: Mahle GmbH
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Filing: 1985-07-31
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Granted: 1987-05-05
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Expires: 2005-07-31
Abstract
Abstract In a plunger piston of aluminum for internal combustion engines the margin of the combustion chamber trough arranged in the piston crown is fiber-reinforced. The proportion of fibers in the basic material to be reinforced varies over the circumference of the combustion chamber trough margin. The marginal zone in the vicinity of the bolt axis (B) here possesses a higher fiber proportion than the trough margin zone adjoining the connecting rod oscillation plane (A). In this way a good temperature change stability of the marginal material is achieved in the zone adjoining the connecting rod oscillation plane (A) and a good fatigue strength is achieved in the zone adjoining the bolt axis (B).
Inventors
- 👤 Hans-Jurgen Kohnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
F; F02; F02F; F02F3/00; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0603; F02B23/0636; F02B23/0639; F02F7/00; F02F7/0085; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2253/00; F05C2253/16; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A plunger piston of aluminum material for internal combustion engines comprising (a) a skirt having aligned gudgeon pin bores, (b) a crown integral with the skirt at one end thereof, said crown having a combustion chamber trough formed therein, and (c) an annular fiber-reinforcement in an internal marginal region of the trough adjacent the axially outer surface of the crown, which reinforcement is bonded into the aluminum material of the piston crown, fibers per unit of volume of reinforced aluminum material having a density being higher in two regions each extending circumferentially over an angle of 30-40 degrees on each side of a first plane containing the gudgeon pin axis and the longitudinal axis of the piston than that of the fibers in two remaining regions each extending circumferentially on each side of a second plane which is set at right angles to the first plane and containing the longitudinal axis of the piston.
Claim 2
Dependent Claim
154 words
A plunger piston of aluminum material for internal combustion engines comprising (a) a skirt having aligned gudgeon pin bores, (b) a crown integral with the skirt at one end thereof, said crown having a combustion chamber trough formed therein, and (c) an annular fiber-reinforcement in an internal marginal region of the trough adjacent the axially outer surface of the crown, which reinforcement is bonded into the aluminum material of the piston crown, fibers per unit of volume of reinforced aluminum material having a density being higher in two regions each extending circumferentially over an angle of 30-40 degrees on each side of a first plane containing the gudgeon pin axis and the longitudinal axis of the piston than that of the fibers in two remaining regions each extending circumferentially on each side of a second plane which is set at right angles to the first plane and containing the longitudinal axis of the piston.
Claim 3
Dependent Claim
38 words
A plunger piston according to claim 1, wherein the density of fibers per unit of volume of reinforced aluminum material in the regions of the first plane, is about twice that in the regions of the second plane.
Claim 4
Dependent Claim
27 words
A plunger piston according to claim 1, wherein the fibers per unit of volume of reinforced aluminum material is 5-15% in the regions of the second plane.
Claim 5
Dependent Claim
35 words
A plunger piston according to claim 1, wherein the first and second regions extend circumferentially over equal angles and in each case lie symmetrically in relation to the first plane and to the second plane.
Claim 6
Dependent Claim
18 words
A plunger piston according to claim 1, wherein material forming the reinforcement comprises short fibers of aluminum oxide.
Claim 7
Dependent Claim
18 words
A plunger piston according to claim 1, wherein material forming the reinforcement comprises short fibers of silicon carbide.
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) | 1990-05-04 | 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 |