EP0449848A1 - Light plunger piston for internal combustion engines. - Google Patents
Light plunger piston for internal combustion engines.Info
- Publication number
- EP0449848A1 EP0449848A1 EP89912953A EP89912953A EP0449848A1 EP 0449848 A1 EP0449848 A1 EP 0449848A1 EP 89912953 A EP89912953 A EP 89912953A EP 89912953 A EP89912953 A EP 89912953A EP 0449848 A1 EP0449848 A1 EP 0449848A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- pressure side
- area
- shaft
- axis
- 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.)
- Granted
Links
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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
-
- 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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
- F02F3/025—Pistons having means for accommodating or controlling heat expansion having circumferentially slotted piston skirts, e.g. T-slots
-
- 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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
- F02F3/022—Pistons having means for accommodating or controlling heat expansion the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval
-
- 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
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
Definitions
- the invention relates to a lightweight plunger for internal combustion engines according to the preamble of claim 1.
- the piston shaft on the counter-pressure side is designed to be somewhat more flexible overall than on the pressure side.
- the running play on the counterpressure side can be chosen to be less than the cylinder running surface than on the pressure side.
- the one on the print page The longer shaft compared to the counter pressure side has the following effects in engine operation:
- the axis of the bolt axis is dislocated to the pressure side, which causes the piston on its top land to come into contact with the cylinder on the counter-pressure side.
- the longer shaft prevents the top land from striking in this way and thus increases piston noise.
- a piston according to the invention is shown in the drawing. Show it
- Fig. 1 shows a piston in longitudinal section
- Fig. 2a, b the piston in section along line Ha and Ilb
- Fig. 3 shows the view of another piston
- Fig. 4 shows the generatrix of the piston of FIG. 3 in the pressure-counter pressure direction and in the bolt direction on the pressure side of the piston
- Fig. 5 shows the surface line course of the piston according to Fig. 3 in the pressure-counter pressure direction and in the bolt direction the counter pressure side of the piston
- FIG. 6 shows a section through the piston along line VI-VI in FIG. 3
- the piston according to FIG. 1 has a longer shaft on the pressure side DS than the counter pressure side GDS.
- the wall thickness of the shaft is greater on the pressure side DS than on the counter pressure side GDS, on which a horizontal slot separates the shaft from the piston head within the lowest annular groove.
- the slot and the thinner wall thickness of the shaft ensure a certain elastic flexibility on the counter-pressure side GDS, which should not be present on the pressure side.
- the control strips inserted in the interior of the piston skirt of the piston according to FIG. 1 enable the skirt to be guided more closely when the piston is cold. Due to the arrangement of the control strip on the counterpressure side GDS compared to the pressure side closer to the upper shaft end, the play between the upper shaft and cylinder area there can be set lower in the cold state than in the relevant shaft area on the pressure side.
- the curves DR and DB on the pressure side as well as GR and GB on the pressure side indicate the surface line course in the pressure-counter pressure direction for a piston according to FIG. 3.
- the straight lines 0 in FIGS. 4 and 5 indicate the cylinder track for the piston. In the areas in which the DR or GR curves touch the respective straight line 0, the clearance between the piston skirt and the cylinder surface is zero. In general, the distance between the curves GR, GB, DR and DB on the one hand and the straight line 0 on the other hand means the play of the piston running surface against the cylinder running surface.
- the curvature of the curves DR, DB and GR, GB corresponds to the respective piston outer shape.
- the piston skirt on the counter pressure side has a lower crowning in the upper skirt area than in the comparable area on the pressure side.
- the narrower guide on the Gegen ⁇ pressure side is determined by the total of the more compliant Aus ⁇ 'piston shaft on this side of the piston formation possible.
- the higher flexibility is achieved on the one hand by a horizontal slot between the shaft and the piston head and on the other hand by the greater ovality of the piston shaft in the circumferential direction.
- the resilience of the piston skirt on the counter pressure side can also be increased by the fact that the shaft thickness there is less than in the corresponding area on the pressure side.
- the stretch-regulating insert strip indicated by the dot-dash line in FIG. 3 lies axially on the counter pressure side higher than the upper shaft edge than on the pressure side.
- the ribs located in the area of the pressure side of the piston can be made more solid and thus more stable than the ribs in question the counter pressure side. It is also possible that ribs of this type, in the case of hubs which are otherwise freely formed on the piston crown, are only attached to the pressure side, while they can be entirely absent on the counter pressure side.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Un piston plongeur de poids et de dimensions aussi réduits que possible fonctionne avec le moins de bruit possible. A cet effet, la partie supérieure de la tige du piston est séparée de la tête du piston par une fente horizontale ménagée du côté contre-pression d'un plan qui traverse l'axe longitudinal du piston et de l'axe de piston. En outre, la tige peut être plus longue du côté pression que du côté contre-pression.A plunger that is as small as possible in weight and dimensions operates with as little noise as possible. To this end, the upper part of the piston rod is separated from the piston head by a horizontal slot formed on the counter-pressure side of a plane which passes through the longitudinal axis of the piston and of the piston pin. In addition, the rod may be longer on the pressure side than on the back pressure side.
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3843761 | 1988-12-24 | ||
DE3843866 | 1988-12-24 | ||
DE3843866A DE3843866A1 (en) | 1988-12-24 | 1988-12-24 | Light trunk piston for internal combustion engines |
DE3843761A DE3843761A1 (en) | 1988-12-24 | 1988-12-24 | Light trunk piston for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0449848A1 true EP0449848A1 (en) | 1991-10-09 |
EP0449848B1 EP0449848B1 (en) | 1994-02-09 |
Family
ID=25875633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89912953A Expired - Lifetime EP0449848B1 (en) | 1988-12-24 | 1989-11-29 | Light plunger piston for internal combustion engines |
Country Status (7)
Country | Link |
---|---|
US (1) | US5158008A (en) |
EP (1) | EP0449848B1 (en) |
JP (1) | JP2983621B2 (en) |
KR (1) | KR970003153B1 (en) |
BR (1) | BR8907852A (en) |
DE (1) | DE58906955D1 (en) |
WO (1) | WO1990007642A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107917013A (en) * | 2016-10-11 | 2018-04-17 | 现代自动车株式会社 | Piston assembly with improved greasy property |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5379680A (en) * | 1989-09-25 | 1995-01-10 | Alcan Deutschland Gmbh | Piston for an internal combustion engine |
DE4110306A1 (en) * | 1990-09-20 | 1992-03-26 | Mahle Gmbh | SUBMERSIBLE ALLOY PISTON FOR OTTO ENGINES |
JPH06257507A (en) * | 1993-03-09 | 1994-09-13 | Nissan Motor Co Ltd | Piston of internal combustion engine |
DE4326978A1 (en) * | 1993-08-11 | 1995-02-16 | Alcan Gmbh | Pistons for internal combustion engines, in particular for diesel engines |
JP3541511B2 (en) * | 1995-07-07 | 2004-07-14 | いすゞ自動車株式会社 | piston |
DE19643778C2 (en) * | 1996-10-23 | 2000-04-13 | Alcan Gmbh | Lightweight pistons |
US7293497B2 (en) * | 2005-11-03 | 2007-11-13 | Dresser, Inc. | Piston |
US7302884B2 (en) * | 2005-11-03 | 2007-12-04 | Dresser, Inc. | Piston |
ATE475826T1 (en) * | 2005-11-03 | 2010-08-15 | Dresser Inc | PISTONS |
US9970384B2 (en) * | 2009-11-06 | 2018-05-15 | Federal-Mogul Llc | Steel piston with cooling gallery and method of construction thereof |
US8807109B2 (en) * | 2009-11-06 | 2014-08-19 | Federal-Mogul Corporation | Steel piston with cooling gallery and method of construction thereof |
US9470311B2 (en) | 2012-06-14 | 2016-10-18 | Mahle International Gmbh | Lightweight engine power cell assembly |
CN215487442U (en) * | 2020-11-20 | 2022-01-11 | 浙江春风动力股份有限公司 | Engine balancing device and engine adopting same |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1499073A (en) * | 1919-09-04 | 1924-06-24 | Aluminum Co Of America | Piston |
GB1256242A (en) * | 1968-09-05 | 1971-12-08 | Ass Eng Ltd | Improvements in pistons |
US3908521A (en) * | 1972-07-31 | 1975-09-30 | Hepworth & Grandage Ltd | Pistons for internal combustion engines or for compressors |
JPS601942B2 (en) * | 1982-04-15 | 1985-01-18 | 三菱マテリアル株式会社 | Sintered materials for cutting tools and wear-resistant tools with excellent high-temperature properties |
DE3430132A1 (en) * | 1984-08-16 | 1986-02-27 | Mahle Gmbh, 7000 Stuttgart | ALUMINUM IMMERSION PISTON FOR COMBUSTION ENGINES WITH CONTROL STRIPS |
DE3430258A1 (en) * | 1984-08-17 | 1986-02-27 | Mahle Gmbh, 7000 Stuttgart | SUBMERSIBLE PISTON FOR COMBUSTION ENGINES |
IT1182507B (en) * | 1985-07-12 | 1987-10-05 | Ae Borgo Spa | PISTONS WITH ASYMMETRIC PROFILE FOR INTERNAL COMBUSTION ENGINES |
DE3527032A1 (en) * | 1985-07-27 | 1987-01-29 | Mahle Gmbh | SUBMERSIBLE PISTON, IN PARTICULAR FOR COMBUSTION ENGINES |
DE3820473C2 (en) * | 1986-12-18 | 1998-03-26 | Mahle Gmbh | Light plunger for internal combustion engines |
EP0327595B1 (en) * | 1986-12-23 | 1990-04-25 | Mahle Gmbh | Single-piece, lightweight and low-friction light-metal piston for internal combustion engines |
DE3713242C1 (en) * | 1987-04-18 | 1988-10-20 | Mahle Gmbh | Light metal plunger for internal combustion engines |
JPS6457461A (en) * | 1987-08-28 | 1989-03-03 | Canon Kk | Recorder |
-
1989
- 1989-11-29 WO PCT/DE1989/000745 patent/WO1990007642A1/en active IP Right Grant
- 1989-11-29 KR KR1019900701873A patent/KR970003153B1/en not_active IP Right Cessation
- 1989-11-29 US US07/688,583 patent/US5158008A/en not_active Expired - Lifetime
- 1989-11-29 EP EP89912953A patent/EP0449848B1/en not_active Expired - Lifetime
- 1989-11-29 JP JP2500129A patent/JP2983621B2/en not_active Expired - Fee Related
- 1989-11-29 DE DE89912953T patent/DE58906955D1/en not_active Expired - Lifetime
- 1989-11-29 BR BR898907852A patent/BR8907852A/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9007642A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107917013A (en) * | 2016-10-11 | 2018-04-17 | 现代自动车株式会社 | Piston assembly with improved greasy property |
Also Published As
Publication number | Publication date |
---|---|
WO1990007642A1 (en) | 1990-07-12 |
US5158008A (en) | 1992-10-27 |
JPH04502501A (en) | 1992-05-07 |
KR970003153B1 (en) | 1997-03-14 |
EP0449848B1 (en) | 1994-02-09 |
KR910700404A (en) | 1991-03-15 |
BR8907852A (en) | 1991-10-08 |
DE58906955D1 (en) | 1994-03-24 |
JP2983621B2 (en) | 1999-11-29 |
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