EP0604223A1 - Tête de piston pour moteur diesel - Google Patents
Tête de piston pour moteur diesel Download PDFInfo
- Publication number
- EP0604223A1 EP0604223A1 EP93310443A EP93310443A EP0604223A1 EP 0604223 A1 EP0604223 A1 EP 0604223A1 EP 93310443 A EP93310443 A EP 93310443A EP 93310443 A EP93310443 A EP 93310443A EP 0604223 A1 EP0604223 A1 EP 0604223A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cap
- inches
- piston cap
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
- F02F3/0023—Multi-part pistons the parts being bolted or screwed together
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0448—Steel
Definitions
- This invention is directed to the cap or crown of a piston for a diesel engine, for example a medium size diesel engine.
- the diesel engine is characterized by the fact that the fuel air mixture is ignited by heat produced during the compression of the air in the cylinder.
- the air of the cylinder is compressed to a predetermined pressure to ensure that the required temperature for fuel ignition is reached before the piston has reached top dead centre so that when the fuel is begun to be injected into the hot air combustion will take place.
- Combustion begins before the piston reaches top dead centre and the pressure in the cylinder continues to increase until the piston reaches top dead centre where upon the combustion continues for a predetermined period of time with the maximum cylinder pressure occurring shortly after top dead centre.
- the piston is driven to the bottom of the cylinder (where the exhaust stroke begins) and it is only during the power stroke that useful work is accomplished by the burning fuel.
- the piston in a modern diesel must be as light as possible in order to reduce the mass of material which is reciprocated for each stroke of the engine.
- the piston must also have sufficient strength to withstand the severe loads placed upon it during combustion and the piston must also maintain a temperature profile which will give the "best" combustion of the fuel air mixture for reasons of efficiency and environmental considerations. It is to this end that the piston of the present invention has been developed.
- One illustrative embodiment of the present invention is a replacement piston for an engine which is fairly large, and which engine has a proven service record, and the specific engine to which this relates is the ALCO® Model 251 Series "V"-type diesel engine previously manufactured under license by Bombardier Inc. in Quebec, Canada and now manufactured by General Electric Canada Inc. in Quebec, Canada.
- the constraints on the designer of the piston are such that the same components be used in association with the redesigned piston, ie the block, crankshaft and connecting rods and bearings used previous to the "new" piston design may be successfully utilized in the modified ALCO® 251 engine, and yet be able to realize the desired improvement in operation.
- a replacement piston for an ALCO® Model 251 diesel engine which piston is of two piece construction.
- a crown or cap (which is the subject of this invention) is attached to a body such that the two parts from an integral piston which will provide more efficient engine operation than the piston of the prior art ALCO® 251 diesel engines.
- Figure 1 is a view of a known composite piston assembly.
- Figure 2 is a sectional view of a known piston cap showing the body sleeve in phantom;
- Figure 3 is a top perspective view of the cap of the piston which is the subject of this invention.
- Figure 4 is a sectional view piston cap of this invention.
- Figure 1 is shown to illustrate the general nature of the composite piston assembly to which this invention relates.
- Figure 2 illustrates a piston cap or crown of the prior design for the ALCO® 251 V16 engine.
- the piston cap shown is the upper part of the piston assembly shown in Figure 1 which acts as a seal in the cylinder, however the lower part of the piston assembly, ie the cylindraceous sleeve or body which houses a connecting rod pin will not be shown further or described in detail herein because the present invention relates to the cap.
- the piston cap shown in Figure 2 has a nominal diameter of about 9'' and a height from the bottom surface to the top of the crown of about 3 1/2''.
- the piston cap shown is composed of a steel alloy and is provided with three grooves and adjacent lands for receiving piston rings in the lower part of the skirt. These grooves are designated as 12, 14, and 16.
- the top of piston 10 has a flat annular surface 18 which is provided with four valve pockets 20, 22, 24 and 26.
- the piston cap is provided with a depression or bowl 28 which is curved sharply downwardly at the surface 30 near the exterior of the piston cap 10 to a point of maximum depression at 32 and the bowl rises at a shallow angle to a high point 34 at the center of the bowl and cap.
- the point of maximum depression in this instance will be about 1.1'' below surface 18.
- the lower surface of the crown is a complex shape formed by surfaces of revolution so that it is essentially hollow.
- a circular groove 36 Near the exterior at the top of the lower surface of the piston cap is a circular groove 36 which rises deeply into the piston cap 10 at ever increasing diameter but at substantially constant width.
- a second concentric groove 38 spaced somewhat inwardly from groove 36 is formed at the lower surface of the piston cap 10.
- first flat land 40 which will be used to bear on the lower part of the piston assembly, such as that shown in Figure 1.
- a second flat land 42 is also shown on a lower surface of the piston cap 10 for support of the centre of the piston bowl.
- the lower surface of the piston cap is produced into a single shaft 46 which is provided with a threaded end 48 so that the piston cap 10 may be rotatably secured to the lower body of the piston assembly.
- the ALCO® Model 251 piston cap 10 of the prior art has functioned satisfactorily in the transportation industry for many years in circumstances wherein the compression ratio to be withstood by the piston 10 would be in the order of 11.5 to 1.
- piston cap 110 of the present invention having a nominal diameter of 9" and a depth of about 3.5".
- Piston cap 110 has grooves 112, 114, and 116 for receiving piston rings at the lower part of the skirt.
- the top of piston cap 110 has an annular flat surface 118 of about 0.6 inches width which is interrupted by four valve pockets 120, 122, 124 and 126 formed therein.
- the central top portion of the top surface has been provided with a shallow bowl 128 which is shaped such that the bowl surface 130 slopes downwardly and inwardly in a shallow angle to reach its maximum depth at 132, which is about 0.9" below surface 118.
- the surface rises in a shallow angle to a shallow apex 134 at the centre of the top surface of bowl 128.
- Apex 134 rises almost to the height of annular surface 118.
- the maximum diameter of the bowl is about 7.75 e.g. 7.78 inches.
- the lower surface of the piston cap 110 is essentially hollow and provided with an exterior groove 136 which rises in a complex shape at an increasing diameter and variable width.
- the exterior groove 136 rises to about 2.8 inches above the lower surface of the skirt.
- Concentrically located in the lower surface is a second groove 138 somewhat spaced from groove 136 and between which is a flat annular shaped land 140 which is provided for support of the lower surface on the lower body assembly of the composite piston (which is not shown).
- the second groove rises about 2.7 inches above the lower surface of the skirt.
- a second flat annular land 142 is formed in the interior of the lower surface of the piston cap 110 adjacent to which is developed a shaft 144, which projects downwardly from the centre of the lower surface of the piston cap 110. Threaded portion 146 of shaft 144 corresponds to threaded section 48 of piston cap 10 of Figure 1.
- the piston cap shown in Figures 3 and 4 is formed of a steel alloy and has the same nominal outer diameter as the piston cap shown in Figures 2 and 3. However, it will become immediately apparent to the reader that the top surface of the piston cap 110 is substantially different from the piston cap shown in Figure 1.
- the bowl of 128 of the piston cap 110 is of a much shallower nature than the bowl 28 of the piston cap 10. Both piston caps are intended for operation in cylinders of the same nominal diameter and piston cap 110 provides an overall improvement in fuel efficiency of approximately one and half percent (1.5%). In an engine which may use as many as 12 or 16 cylinders of a nominal diameter of about 9'' this improvement is substantial over its operating life.
- piston cap 110 leads to a more complete combustion of the fuel-air mixture than does piston cap 10.
- each cap may have at least two valve pockets which are preferably symmetrically arranged thereon.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2086133 CA2086133A1 (fr) | 1992-12-23 | 1992-12-23 | Piston pour moteur diesel alco, de serie 251 |
CA2086133 | 1992-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0604223A1 true EP0604223A1 (fr) | 1994-06-29 |
Family
ID=4150898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93310443A Withdrawn EP0604223A1 (fr) | 1992-12-23 | 1993-12-22 | Tête de piston pour moteur diesel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0604223A1 (fr) |
AU (1) | AU5243193A (fr) |
BR (1) | BR9305205A (fr) |
CA (1) | CA2086133A1 (fr) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003076786A1 (fr) | 2002-03-09 | 2003-09-18 | Mahle Gmbh | Piston refroidi constitue de plusieurs pieces conçu pour un moteur a combustion interne |
US6729291B1 (en) | 2002-12-06 | 2004-05-04 | Mahle Gmbh | Multipart cooled piston for an internal combustion engine |
DE102004027974A1 (de) * | 2004-06-08 | 2005-12-29 | Mahle Gmbh | Gebauter Kolben und Verfahren zur Vermeidung von Beschädigungen in Kontakt zueinander stehender Flächen des Oberteiles und des Unterteiles des Kolbens |
WO2007025529A1 (fr) * | 2005-09-01 | 2007-03-08 | Mahle International Gmbh | Piston en deux parties pour moteur a combustion interne |
DE102005042003A1 (de) * | 2005-09-05 | 2007-03-08 | Mahle International Gmbh | Gebauter, flüssigkeitsgekühlter Kolben |
WO2007068222A1 (fr) * | 2005-12-17 | 2007-06-21 | Mahle International Gmbh | Piston en deux pieces pour moteur a combustion interne |
DE102005060611A1 (de) * | 2005-12-17 | 2007-06-21 | Mahle International Gmbh | Mehrteiliger Kolben für einen Verbrennungsmotor |
CN105370431A (zh) * | 2014-08-19 | 2016-03-02 | 迪尔公司 | 用在发动机中的活塞 |
WO2017060449A1 (fr) * | 2015-10-08 | 2017-04-13 | Ks Kolbenschmidt Gmbh | Piston pourvu d'un filetage extérieur |
CN111502856A (zh) * | 2020-04-30 | 2020-08-07 | 上海建桥学院 | 一种柴油机活塞头及其数控加工工艺 |
CN113250846A (zh) * | 2021-06-18 | 2021-08-13 | 中国北方发动机研究所(天津) | 一种组合式高强隔热结构活塞 |
US11162453B2 (en) | 2016-05-04 | 2021-11-02 | Ks Kolbenschmidt Gmbh | Piston |
US11293374B2 (en) | 2020-07-31 | 2022-04-05 | Fev Gmbh | Piston bowl geometries for internal combustion engines |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983002300A1 (fr) * | 1981-12-28 | 1983-07-07 | Alco Power Inc | Piston composite precontraint |
GB2205922A (en) * | 1987-06-11 | 1988-12-21 | Mahle Gmbh | Built-up liquid-cooled piston for internal combustion engines |
US5081968A (en) * | 1990-07-31 | 1992-01-21 | Borgo Nova Spa | Pistons for an internal combustion engine |
-
1992
- 1992-12-23 CA CA 2086133 patent/CA2086133A1/fr not_active Abandoned
-
1993
- 1993-12-15 AU AU52431/93A patent/AU5243193A/en not_active Abandoned
- 1993-12-22 BR BR9305205A patent/BR9305205A/pt not_active Application Discontinuation
- 1993-12-22 EP EP93310443A patent/EP0604223A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983002300A1 (fr) * | 1981-12-28 | 1983-07-07 | Alco Power Inc | Piston composite precontraint |
GB2205922A (en) * | 1987-06-11 | 1988-12-21 | Mahle Gmbh | Built-up liquid-cooled piston for internal combustion engines |
US5081968A (en) * | 1990-07-31 | 1992-01-21 | Borgo Nova Spa | Pistons for an internal combustion engine |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100893015B1 (ko) * | 2002-03-09 | 2009-04-15 | 말레 게엠베하 | 내연기관용 다부품 냉각 피스톤 |
US6763758B2 (en) | 2002-03-09 | 2004-07-20 | Mahle Gmbh | Multi-part cooled piston for an internal combustion engine |
WO2003076786A1 (fr) | 2002-03-09 | 2003-09-18 | Mahle Gmbh | Piston refroidi constitue de plusieurs pieces conçu pour un moteur a combustion interne |
US6729291B1 (en) | 2002-12-06 | 2004-05-04 | Mahle Gmbh | Multipart cooled piston for an internal combustion engine |
DE102004027974A1 (de) * | 2004-06-08 | 2005-12-29 | Mahle Gmbh | Gebauter Kolben und Verfahren zur Vermeidung von Beschädigungen in Kontakt zueinander stehender Flächen des Oberteiles und des Unterteiles des Kolbens |
DE102005041409A1 (de) * | 2005-09-01 | 2007-03-08 | Mahle International Gmbh | Zweiteiliger Kolben für einen Verbrennungsmotor |
US8651084B2 (en) | 2005-09-01 | 2014-02-18 | Mahle International Gmbh | Two-part piston for an internal combustion engine |
US7946268B2 (en) | 2005-09-01 | 2011-05-24 | Mahle International Gmbh | Two-part piston for an internal combustion engine |
WO2007025529A1 (fr) * | 2005-09-01 | 2007-03-08 | Mahle International Gmbh | Piston en deux parties pour moteur a combustion interne |
US7934482B2 (en) | 2005-09-05 | 2011-05-03 | Mahle International Gmbh | Liquid-cooled composite piston |
WO2007028364A1 (fr) * | 2005-09-05 | 2007-03-15 | Mahle International Gmbh | Piston en plusieurs parties, refroidi par liquide |
JP4838848B2 (ja) * | 2005-09-05 | 2011-12-14 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | 組み立て式の液体冷却されるピストン |
DE102005042003A1 (de) * | 2005-09-05 | 2007-03-08 | Mahle International Gmbh | Gebauter, flüssigkeitsgekühlter Kolben |
CN101331307B (zh) * | 2005-12-17 | 2010-08-11 | 马勒国际公司 | 两段式内燃机活塞 |
US7302927B1 (en) | 2005-12-17 | 2007-12-04 | Mahle International Gmbh | Two-part piston for an internal combustion engine |
JP4838858B2 (ja) * | 2005-12-17 | 2011-12-14 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | 内燃機関用の2部分から成るピストン |
DE102005060611A1 (de) * | 2005-12-17 | 2007-06-21 | Mahle International Gmbh | Mehrteiliger Kolben für einen Verbrennungsmotor |
WO2007068222A1 (fr) * | 2005-12-17 | 2007-06-21 | Mahle International Gmbh | Piston en deux pieces pour moteur a combustion interne |
CN105370431A (zh) * | 2014-08-19 | 2016-03-02 | 迪尔公司 | 用在发动机中的活塞 |
WO2017060449A1 (fr) * | 2015-10-08 | 2017-04-13 | Ks Kolbenschmidt Gmbh | Piston pourvu d'un filetage extérieur |
US11162453B2 (en) | 2016-05-04 | 2021-11-02 | Ks Kolbenschmidt Gmbh | Piston |
CN111502856A (zh) * | 2020-04-30 | 2020-08-07 | 上海建桥学院 | 一种柴油机活塞头及其数控加工工艺 |
US11293374B2 (en) | 2020-07-31 | 2022-04-05 | Fev Gmbh | Piston bowl geometries for internal combustion engines |
CN113250846A (zh) * | 2021-06-18 | 2021-08-13 | 中国北方发动机研究所(天津) | 一种组合式高强隔热结构活塞 |
Also Published As
Publication number | Publication date |
---|---|
AU5243193A (en) | 1994-07-07 |
BR9305205A (pt) | 1994-07-26 |
CA2086133A1 (fr) | 1994-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): ES GR PT |
|
17P | Request for examination filed |
Effective date: 19941229 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19950616 |