EP2027381A2 - Multi-part cooled piston for an internal combustion engine - Google Patents
Multi-part cooled piston for an internal combustion engineInfo
- Publication number
- EP2027381A2 EP2027381A2 EP07785519A EP07785519A EP2027381A2 EP 2027381 A2 EP2027381 A2 EP 2027381A2 EP 07785519 A EP07785519 A EP 07785519A EP 07785519 A EP07785519 A EP 07785519A EP 2027381 A2 EP2027381 A2 EP 2027381A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- piston part
- threaded bolt
- combustion engine
- internal combustion
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- F02F3/0015—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
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
-
- 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
Definitions
- the invention relates to a multi-part piston for an internal combustion engine according to the preamble of claim.
- the published patent application DE 102 57 022 A1 discloses a multi-part cooled piston for an internal combustion engine, which consists of a piston upper part and a piston lower part.
- a threaded bolt is arranged, and in the upper region of the piston lower part a threaded bore is introduced, so that the two piston parts on the threaded bolt and the threaded bore are screwed together.
- the upper portion of the piston lower part is in this case formed so thin-walled that it deforms plate spring-like when screwing piston upper part and piston lower part, so that on the threaded bolt and the threaded bore a bias is applied, which consolidates and secures the screw connection formed thereby.
- the disadvantage here is that in the deformation of the upper portion of the piston bottom near the threaded hole voltage-related cracks can occur, which solve the screw and damage to the piston and thus the engine, in which the piston is installed, can lead.
- the invention is based on the problem to avoid the mentioned disadvantage of the prior art.
- the problem is solved with the standing in the characterizing part of claim characteristics.
- a multi-part cooled piston 1 which consists of a piston upper part 2 with a combustion bowl 3 and an annular wall 4 with ring portion 5 and a piston base 6, a box-shaped piston shaft 7 and two associated pin bosses 8, each with a pin bore 9 has for receiving a piston pin, not shown in the figure.
- the upper piston part 2 and the lower piston part 6 delimit an outer annular cooling channel 10 and an inner cooling channel 11 arranged concentrically therewith, wherein the outer cooling channel 10 has at least one inflow opening 12 for introducing cooling oil and is connected to the inner cooling channel 11 via at least one overflow channel 13 ,
- the overflow channel 13 may be formed as a bore.
- the inner cooling channel 11 has at least one drain hole 14, via which the cooling oil can escape from the inner cooling channel 11.
- the upper piston part 2 and the lower piston part 6 can be made of steel.
- the piston upper part 2 supports, on the one hand, an annular support surface 15 arranged on its underside on an upper support surface 16 of an annular support rib 17 of the piston lower part 6 and, on the other hand, a cross-sectional surface 18 located on the underside of the annular wall 4 on an upper cross-sectional surface 19 of an annular one Supporting web 20 of the piston lower part 6.
- the support surfaces 15 and 16 form an inner, planar and horizontally arranged, or roof or plate-shaped support 21 and the cross-sectional surfaces 18 and 19 to the inner support 21 coaxially arranged and horizontally lying, or also roof-mounted. or dish-shaped outer pad 22.
- the support web 20 is viewed in section as a radially inwardly and upwardly directed step, so that the piston upper part 2 via a in the inside the lower end of the annular wall 4 introduced and complementary to the supporting web 20 shaped recess 23 can be centered relative to the piston lower part 6 by the recess 23 of the annular wall 4 of the piston upper part 2 is pushed onto the support web 20 of the piston lower part 6.
- the inner diameter of the recess 23 it is necessary for the inner diameter of the recess 23 to be larger by a specific tolerance than the outer diameter of the cylindrical end face 24 of the support web 20, so that trouble-free mounting of the piston upper part 2 on the piston lower part 6 is ensured.
- the underside of the upper piston part 2 has a centrally located and coaxial with the piston axis 25 blind hole 26 with internal thread 28.
- the region 31 between the annular support rib 17 of the piston lower part 6, which defines the inner cooling channel 11 together with the piston upper part 2, is formed relatively thin-walled and is provided in its center with a coaxial with the piston axis 25 and upwardly directed threaded bolt 29, the upper End 27 has an external thread 30 which fits into the internal thread 28 of the blind hole 26.
- the upper piston part 2 is centered over the recess 23 and the support web 20 relative to the lower piston part 6 and then rotated about the piston axis 25, wherein the blind hole 26 is screwed onto the threaded bolt 29.
- the elasticity of the relatively thin-walled region 31 causes it to deform like a disk spring when the upper and lower piston parts are screwed together, ie, the inner center of the region 31 provided with the threaded bolt 29 bulges in the direction of the piston upper part 2.
- the tensile stress exerted on the unthreaded shank 32 of the threaded bolt 29 during assembly leads to an elastic extension of the shank 29.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006027354A DE102006027354A1 (en) | 2006-06-13 | 2006-06-13 | Multi-piece cooled piston for an internal combustion engine |
PCT/DE2007/001015 WO2007143969A2 (en) | 2006-06-13 | 2007-06-08 | Multi-part cooled piston for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2027381A2 true EP2027381A2 (en) | 2009-02-25 |
EP2027381B1 EP2027381B1 (en) | 2010-08-18 |
Family
ID=38626907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07785519A Expired - Fee Related EP2027381B1 (en) | 2006-06-13 | 2007-06-08 | Multi-part cooled piston for an internal combustion engine |
Country Status (7)
Country | Link |
---|---|
US (1) | US8201537B2 (en) |
EP (1) | EP2027381B1 (en) |
JP (1) | JP2009540201A (en) |
KR (1) | KR20090018628A (en) |
CN (1) | CN101466937B (en) |
DE (2) | DE102006027354A1 (en) |
WO (1) | WO2007143969A2 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008045456A1 (en) * | 2008-09-02 | 2010-03-04 | Mahle International Gmbh | Piston for an internal combustion engine |
DE102009027148B4 (en) | 2009-06-24 | 2015-02-12 | Federal-Mogul Nürnberg GmbH | Piston for an internal combustion engine with cooling duct system |
JP5365700B2 (en) * | 2009-11-25 | 2013-12-11 | トヨタ自動車株式会社 | Piston for internal combustion engine and internal combustion engine |
DE102010009891A1 (en) * | 2010-03-02 | 2011-09-08 | Mahle International Gmbh | Piston for an internal combustion engine |
DE102011013139A1 (en) * | 2011-03-04 | 2012-09-06 | Mahle International Gmbh | Piston for an internal combustion engine |
US8973484B2 (en) * | 2011-07-01 | 2015-03-10 | Mahle Industries Inc. | Piston with cooling gallery |
EP2875229B1 (en) * | 2012-07-20 | 2017-11-22 | Federal-Mogul Corporation | Piston with oil cooling passage and method of construction thereof |
CN102943717A (en) * | 2012-12-06 | 2013-02-27 | 湖南江滨机器(集团)有限责任公司 | Steel roof aluminum skirt combinational piston |
KR101383121B1 (en) * | 2013-07-01 | 2014-04-09 | 삼영기계주식회사 | A piston assembly |
CN105986923B (en) * | 2015-02-09 | 2019-02-19 | 强哲菲 | A kind of double oil pocket steel pistons and its processing method |
US10294887B2 (en) * | 2015-11-18 | 2019-05-21 | Tenneco Inc. | Piston providing for reduced heat loss using cooling media |
CN113202654A (en) * | 2021-05-18 | 2021-08-03 | 大昌汽车部件(苏州)有限公司 | Combined engine piston and forging process thereof |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1903219A (en) * | 1928-08-17 | 1933-03-28 | Hugh G Landis | Electric heater |
US2024269A (en) * | 1933-06-20 | 1935-12-17 | Bernard Renee | Piston |
US2198771A (en) * | 1937-04-19 | 1940-04-30 | Gen Motors Corp | Welded two-piece light alloy piston |
US2398577A (en) * | 1944-06-01 | 1946-04-16 | George V Bratzel | Piston for internal-combustion engines |
DE2914456A1 (en) | 1979-04-10 | 1980-10-23 | Schmidt Gmbh Karl | BUILT PISTON FOR INTERNAL COMBUSTION ENGINES |
JPS59500003A (en) * | 1981-12-28 | 1984-01-05 | アルコ・パワ−・インコ−ポレ−テツド | Prestressed composite piston |
DE3719469A1 (en) | 1987-06-11 | 1988-12-29 | Mahle Gmbh | BUILT LIQUID-COOLED PISTON FOR COMBUSTION ENGINES |
DE4131275C2 (en) * | 1991-09-20 | 1998-04-09 | Mahle Gmbh | Built liquid-cooled piston |
FI102559B1 (en) * | 1995-03-09 | 1998-12-31 | Waertsilae Nsd Oy Ab | Internal combustion engine piston unit |
DE19846496A1 (en) * | 1998-10-09 | 2000-04-13 | Mahle Gmbh | Internal combustion engine piston with base, beneath which is oil-fed cooling chamber with lower limit formed by plate fixed to piston, pressure-loaded devices pressing elastically deformable plate in direction of piston base |
DE10257022A1 (en) | 2002-12-06 | 2004-06-17 | Mahle Gmbh | Multi-part cooled piston for an internal combustion engine |
DE102004027974A1 (en) | 2004-06-08 | 2005-12-29 | Mahle Gmbh | A built piston and method of preventing damage in contact surfaces of the top and bottom of the piston |
DE102004029877A1 (en) | 2004-06-19 | 2006-01-05 | Mahle Gmbh | Built piston for an internal combustion engine |
DE102004030218A1 (en) * | 2004-06-22 | 2006-01-19 | Mahle Gmbh | Built piston for an internal combustion engine |
-
2006
- 2006-06-13 DE DE102006027354A patent/DE102006027354A1/en not_active Withdrawn
-
2007
- 2007-06-08 DE DE502007004798T patent/DE502007004798D1/en active Active
- 2007-06-08 KR KR1020087030197A patent/KR20090018628A/en not_active Application Discontinuation
- 2007-06-08 JP JP2009514633A patent/JP2009540201A/en active Pending
- 2007-06-08 CN CN2007800219411A patent/CN101466937B/en not_active Expired - Fee Related
- 2007-06-08 WO PCT/DE2007/001015 patent/WO2007143969A2/en active Application Filing
- 2007-06-08 US US12/308,356 patent/US8201537B2/en not_active Expired - Fee Related
- 2007-06-08 EP EP07785519A patent/EP2027381B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007143969A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007143969A3 (en) | 2008-02-28 |
JP2009540201A (en) | 2009-11-19 |
US8201537B2 (en) | 2012-06-19 |
CN101466937A (en) | 2009-06-24 |
CN101466937B (en) | 2011-07-06 |
WO2007143969A2 (en) | 2007-12-21 |
US20110155080A1 (en) | 2011-06-30 |
DE502007004798D1 (en) | 2010-09-30 |
DE102006027354A1 (en) | 2007-12-20 |
EP2027381B1 (en) | 2010-08-18 |
KR20090018628A (en) | 2009-02-20 |
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