US4175502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-cooled, assembled piston for internal combustion engines
Assignee: Karl Schmidt GmbH
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Filing: 1978-05-22
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Granted: 1979-11-27
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Expires: 1998-05-22
Abstract
Abstract In a liquid cooled, assembled piston for an internal combustion engine which has a lower piston part, an upper piston part connected thereto, an annular cooling passage disposed in the upper piston part behind the top land and at least part of the ring-carrying portion thereof, an input coolant conduit in the lower piston part, a central cooling chamber disposed between the two piston parts and a supporting ring concentrically disposed on the underside of the upper piston part and between the annular cooling passage and the central cooling chamber, there is provided an oil guiding ring including a flange gripped between the two piston parts and a lip connected to the flange and protruding into the annular cooling passage for effecting the flow of the oil along the periphery of the cooling passage as it enters same from the input coolant conduit.
Inventors
- 👤 Horst Moebus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:39
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/16; F02F3/20; F02F3/22; F02F3/0015; F02F3/0023; F02B; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
In a liquid-cooled, assembled piston for an internal combustion engine of the type having a lower piston part, an upper piston part connected to the lower piston part, an annular cooling passage disposed in the upper piston part behind the top land and at least part of the ring-carrying portion thereof, an input coolant conduit in the lower piston part, a central cooling chamber disposed between the two piston parts, and a supporting ring concentrically disposed on the underside of the upper piston part and between the annular cooling passage and the central cooling chamber, wherein the improvement comprises: means providing communication between the annular cooling passage and the central cooling chamber, and oil-guiding means for effecting the flow of the oil along the periphery of the cooling passage as it enters same from the input coolant conduit, the liquid guiding means comprising an oil guiding ring including a flange gripped between the two piston parts and a lip connected to the flange and protruding into the annular cooling passage.
Claim 2
Dependent Claim
170 words
In a liquid-cooled, assembled piston for an internal combustion engine of the type having a lower piston part, an upper piston part connected to the lower piston part, an annular cooling passage disposed in the upper piston part behind the top land and at least part of the ring-carrying portion thereof, an input coolant conduit in the lower piston part, a central cooling chamber disposed between the two piston parts, and a supporting ring concentrically disposed on the underside of the upper piston part and between the annular cooling passage and the central cooling chamber, wherein the improvement comprises: means providing communication between the annular cooling passage and the central cooling chamber, and oil-guiding means for effecting the flow of the oil along the periphery of the cooling passage as it enters same from the input coolant conduit, the liquid guiding means comprising an oil guiding ring including a flange gripped between the two piston parts and a lip connected to the flange and protruding into the annular cooling passage.
Claim 3
Dependent Claim
40 words
A piston according to claim 1, wherein the oil-guiding ring is composed of a material having a high thermal conductivity and the lip extends at an angle of 10° to 90°, with respect to the longitudinal axis of the piston.
Claim 4
Dependent Claim
13 words
A piston according to claim 1, wherein the lip is arcuate in cross-section.
Claim 5
Dependent Claim
20 words
A piston according to claim 1, wherein the flange and the lip comprise separate materials having a high thermal conductivity.
Claim 6
Dependent Claim
32 words
A piston according to claim 1, wherein the liquid guiding means comprises bores in the flange of the oil-guiding ring in communication between the input coolant conduit and the annular cooling passage.
Claim 7
Dependent Claim
29 words
A piston according to claim 1, wherein the oil-guiding ring is cup-shaped and is gripped between the supporting ring and the opposite bearing surface of the lower piston part.
Claim 8
Dependent Claim
22 words
A piston according to claim 1, wherein the means providing communication comprises radial coolant bores in the flange of the oil-guiding ring.
Claim 9
Dependent Claim
42 words
A piston according to claim 1 comprising an annular peripheral retaining nose in the upper piston part at the outer radial inside surface of the cooling passage for gripping the flange between same and the opposite surface of the lower piston part.
Claim 10
Dependent Claim
22 words
A piston according to claim 5 wherein the means providing communication comprises radial coolant bores in the flange of the oil-guiding ring.
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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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |