US20110174245A1 - Cooling duct for a piston of a combustion engine - Google Patents

Cooling duct for a piston of a combustion engine Download PDF

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Publication number
US20110174245A1
US20110174245A1 US12/737,824 US73782409A US2011174245A1 US 20110174245 A1 US20110174245 A1 US 20110174245A1 US 73782409 A US73782409 A US 73782409A US 2011174245 A1 US2011174245 A1 US 2011174245A1
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US
United States
Prior art keywords
piston
openings
cooling channel
oil
cooling duct
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.)
Abandoned
Application number
US12/737,824
Inventor
Helmut Kollotzek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Assigned to MAHLE INTERNATIONAL GMBH reassignment MAHLE INTERNATIONAL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOLLOTZEK, HELMUT
Publication of US20110174245A1 publication Critical patent/US20110174245A1/en
Abandoned legal-status Critical Current

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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

Definitions

  • the invention relates to a cooling channel of a piston for an internal combustion engine, in accordance with the preamble of the claim.
  • a cooling channel for a piston of an internal combustion engine is known from the European patent EP 1 063 409 B1, which channel has two openings that are disposed next to one another and are intended to be alternately used as inflow openings, and an outflow opening disposed on the side of the cooling channel that lies radially opposite these openings. It is disadvantageous, in this connection, that the oil introduced into the cooling channel flows through the cooling channel at a very high flow velocity, whereby only a small part of the oil flows out by way of the outflow opening, and the rest continues to flow, at a high flow velocity, to the second opening, alternately used as an inflow opening, and flows out of the cooling channel by way of this opening.
  • a piston 1 for an internal combustion engine having a ring belt 2 , a piston crown 3 , a piston skirt 4 that follows the ring belt 2 on the side facing away from the piston crown, and a pin bore 5 for a piston pin not shown in the FIGURE.
  • a ring-shaped cooling channel 6 is disposed close to the piston crown 3 of the piston 1 , radially on the outside, which channel has two openings 7 and 8 on one side, which openings are connected with the ring-shaped part of the cooling channel 6 by way of a channel bend 9 and 10 in the shape of a quarter circle, in each instance, and face in the direction facing away from the piston crown.
  • the openings 7 and 8 alternately serve as inflow openings or as outflow openings for oil 12 sprayed in the direction of the openings 7 and 8 by an oil nozzle 11 .
  • the piston 1 is shown in a position that corresponds to the upper dead center of the piston 1 .
  • the oil jet 12 which is directed at a slant with reference to the piston axis 13 , impacts the opening 8 , which therefore functions as an inflow opening. If the piston 1 moves downward, in the direction of the arrow 14 , within the scope of the combustion or intake stroke, the opening 7 is impacted by the oil jet 12 starting from a specific piston position, so that then this opening 7 functions as an inflow opening for the oil 12 .
  • the cooling channel 6 On the side that lies radially opposite the openings 7 and 8 , the cooling channel 6 has two outflow openings 15 and 16 that face in the direction facing away from the piston crown. Between the outflow openings 15 and 16 , the cooling channel 6 has a cross-section narrowing 17 that acts as a throttle.
  • the throttle 17 brings about the result, for one thing, that part of the oil 12 sprayed into the opening 8 in the position of the piston 1 shown in the FIGURE is passed out of the outflow opening 16 , and, for another, that the flow of the oil that continues to flow through the left half of the cooling channel 6 is slowed down, which has the effect that no eddies that would hinder the oil inflow by way of the opening 7 , into the left half of the cooling channel 6 , form in the oil in the left half of the cooling channel 6 , when the piston 1 moves downward in the direction of the arrow 14 , whereby the opening 7 gets into the jet path of the oil 12 , in order to then function as an inflow opening.
  • oil then flows through the left half of the cooling channel 6 by way of the opening 7 , and part of this oil flows out of the outflow opening 15 because of the throttle 17 , and the rest continues to flow through the right half of the cooling channel 6 , at a slower velocity, because of the throttle 17 , in order to flow out of the opening 8 .
  • a rapid change in the oil flow direction in the cooling channel 6 and thus improved cooling of the piston 1 are achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Disclosed is a cooling duct (6) for a piston (1) of a combustion engine. The cooling duct (6) has an annular shape and comprises two openings (7, 8) which are arranged next to each other and are alternately used as inlets as well as at least one outlet (15, 16) on the side of the cooling duct (6) located radially opposite the openings (7, 8). In order to allow the oil to more easily flow through the cooling duct (6) and thus the piston (1) to be better cooled, the cooling duct (6) has two outlets (15, 16) that are arranged next to each other as well as a reduced cross-section (17) which lies between the two outlets and acts as a throttle.

Description

  • The invention relates to a cooling channel of a piston for an internal combustion engine, in accordance with the preamble of the claim.
  • A cooling channel for a piston of an internal combustion engine is known from the European patent EP 1 063 409 B1, which channel has two openings that are disposed next to one another and are intended to be alternately used as inflow openings, and an outflow opening disposed on the side of the cooling channel that lies radially opposite these openings. It is disadvantageous, in this connection, that the oil introduced into the cooling channel flows through the cooling channel at a very high flow velocity, whereby only a small part of the oil flows out by way of the outflow opening, and the rest continues to flow, at a high flow velocity, to the second opening, alternately used as an inflow opening, and flows out of the cooling channel by way of this opening. If the oil outflow is stopped by the oil jet that impacts this second opening, because of a changed position of the piston, so that now oil can be introduced into the cooling channel by way of this opening, eddies occur in the oil, which hinder the oil flow in the channel and thus cause the cooling effect of the oil to deteriorate.
  • It is the task of the invention to avoid this disadvantage of the state of the art. This task is accomplished with the characteristics standing in the characterizing part of the claim.
  • The invention will be described in the following, using the drawing. This shows the cooling channel according to the invention, disposed in a piston for an internal combustion engine.
  • In the FIGURE, a piston 1 for an internal combustion engine is shown, having a ring belt 2, a piston crown 3, a piston skirt 4 that follows the ring belt 2 on the side facing away from the piston crown, and a pin bore 5 for a piston pin not shown in the FIGURE.
  • A ring-shaped cooling channel 6 is disposed close to the piston crown 3 of the piston 1, radially on the outside, which channel has two openings 7 and 8 on one side, which openings are connected with the ring-shaped part of the cooling channel 6 by way of a channel bend 9 and 10 in the shape of a quarter circle, in each instance, and face in the direction facing away from the piston crown. The openings 7 and 8 alternately serve as inflow openings or as outflow openings for oil 12 sprayed in the direction of the openings 7 and 8 by an oil nozzle 11.
  • In the FIGURE, the piston 1 is shown in a position that corresponds to the upper dead center of the piston 1. In this connection, the oil jet 12, which is directed at a slant with reference to the piston axis 13, impacts the opening 8, which therefore functions as an inflow opening. If the piston 1 moves downward, in the direction of the arrow 14, within the scope of the combustion or intake stroke, the opening 7 is impacted by the oil jet 12 starting from a specific piston position, so that then this opening 7 functions as an inflow opening for the oil 12.
  • On the side that lies radially opposite the openings 7 and 8, the cooling channel 6 has two outflow openings 15 and 16 that face in the direction facing away from the piston crown. Between the outflow openings 15 and 16, the cooling channel 6 has a cross-section narrowing 17 that acts as a throttle.
  • The throttle 17 brings about the result, for one thing, that part of the oil 12 sprayed into the opening 8 in the position of the piston 1 shown in the FIGURE is passed out of the outflow opening 16, and, for another, that the flow of the oil that continues to flow through the left half of the cooling channel 6 is slowed down, which has the effect that no eddies that would hinder the oil inflow by way of the opening 7, into the left half of the cooling channel 6, form in the oil in the left half of the cooling channel 6, when the piston 1 moves downward in the direction of the arrow 14, whereby the opening 7 gets into the jet path of the oil 12, in order to then function as an inflow opening. In this connection, oil then flows through the left half of the cooling channel 6 by way of the opening 7, and part of this oil flows out of the outflow opening 15 because of the throttle 17, and the rest continues to flow through the right half of the cooling channel 6, at a slower velocity, because of the throttle 17, in order to flow out of the opening 8. In this way, a rapid change in the oil flow direction in the cooling channel 6 and thus improved cooling of the piston 1 are achieved.
    • REFERENCE SYMBOL LIST
    • 1 piston
    • 2 ring belt
    • 3 piston crown
    • 4 piston skirt
    • 5 pin bore
    • 6 cooling channel
    • 7, 8 opening
    • 9, 10 channel bend
    • 11 oil nozzle
    • 12 oil, oil jet
    • 13 piston axis
    • 14 arrow
    • 15, 16 outflow opening
    • 17 cross-section narrowing, throttle

Claims (1)

1. Cooling channel (6) of a piston (1) for an internal combustion engine, having a piston crown (3) and a ring belt (2), wherein the cooling channel (6) is configured in ring shape and is disposed close to the piston crown (3) of the piston (1), radially on the outside, close to its ring belt (2), and has two openings (7, 8) that are disposed next to one another and are intended to be alternately used as inflow openings, and at least one outflow opening (15, 16) disposed on the side of the cooling channel (6) that lies radially opposite the openings (7, 8), wherein the cooling channel (6) has two outflow openings (15, 16) disposed next to one another, and a cross-section narrowing (17) disposed between them, which acts as a throttle.
US12/737,824 2008-08-19 2009-08-19 Cooling duct for a piston of a combustion engine Abandoned US20110174245A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008038324.4 2008-08-19
DE102008038324A DE102008038324A1 (en) 2008-08-19 2008-08-19 Cooling channel of a piston for an internal combustion engine
PCT/DE2009/001162 WO2010020231A2 (en) 2008-08-19 2009-08-19 Cooling duct for a piston of a combustion engine

Publications (1)

Publication Number Publication Date
US20110174245A1 true US20110174245A1 (en) 2011-07-21

Family

ID=41566554

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/737,824 Abandoned US20110174245A1 (en) 2008-08-19 2009-08-19 Cooling duct for a piston of a combustion engine

Country Status (5)

Country Link
US (1) US20110174245A1 (en)
EP (1) EP2329126A2 (en)
JP (1) JP5349596B2 (en)
DE (1) DE102008038324A1 (en)
WO (1) WO2010020231A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120325166A1 (en) * 2011-05-25 2012-12-27 Helmut Kollotzek Casting core for forming a cooling channel in a piston
CN103608640A (en) * 2011-06-21 2014-02-26 拜尔材料科学有限公司 Polycarbonate laminate for close-proximity blast events
US20150167584A1 (en) * 2012-08-01 2015-06-18 Mahle International Gmbh Piston
US20160222912A1 (en) * 2015-01-30 2016-08-04 Federal-Mogul Corporation Piston with cooling gallery cooling insert and method of construction thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014185522A (en) * 2013-03-21 2014-10-02 Hitachi Automotive Systems Ltd Piston of internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595145A (en) * 1995-05-31 1997-01-21 Kabushiki Kaisha Komatsu Seisakusho Cooling structure of diesel engine piston
US5845611A (en) * 1996-05-09 1998-12-08 Daimler-Benz Ag Liquid-cooled piston for internal combustion engines
US5890416A (en) * 1997-01-28 1999-04-06 Alcan Deutschland Gmbh Liquid-cooled piston
US7748361B2 (en) * 2004-09-09 2010-07-06 Federal-Mogul Nurnberg Gmbh Piston for a combustion engine, and combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0742418U (en) * 1993-12-25 1995-08-04 株式会社ユニシアジェックス Piston for internal combustion engine
DE19929102A1 (en) 1999-06-24 2000-12-28 Ks Kolbenschmidt Gmbh Pistons for an internal combustion engine
JP2003301744A (en) * 2002-04-08 2003-10-24 Toyota Motor Corp Piston cooling device and method
JP2007278220A (en) * 2006-04-10 2007-10-25 Toyota Motor Corp Piston cooling structure for internal combustion engine
DE202006020280U1 (en) * 2006-11-28 2008-02-21 Ks Kolbenschmidt Gmbh Cooling channel piston
DE102006056012A1 (en) * 2006-11-28 2008-05-29 Ks Kolbenschmidt Gmbh Variable design cooling channel for one piston
DE102006056011A1 (en) * 2006-11-28 2008-05-29 Ks Kolbenschmidt Gmbh Liquid-cooled piston for e.g. diesel internal-combustion engine, has medium in free jet of nozzles entering into openings, where jet is directed parallel to longitudinal axis of piston, and lower side loaded with medium by jet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595145A (en) * 1995-05-31 1997-01-21 Kabushiki Kaisha Komatsu Seisakusho Cooling structure of diesel engine piston
US5845611A (en) * 1996-05-09 1998-12-08 Daimler-Benz Ag Liquid-cooled piston for internal combustion engines
US5890416A (en) * 1997-01-28 1999-04-06 Alcan Deutschland Gmbh Liquid-cooled piston
US7748361B2 (en) * 2004-09-09 2010-07-06 Federal-Mogul Nurnberg Gmbh Piston for a combustion engine, and combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120325166A1 (en) * 2011-05-25 2012-12-27 Helmut Kollotzek Casting core for forming a cooling channel in a piston
US8733315B2 (en) * 2011-05-25 2014-05-27 Mahle International Gmbh Casting core for forming a cooling channel in a piston
CN103608640A (en) * 2011-06-21 2014-02-26 拜尔材料科学有限公司 Polycarbonate laminate for close-proximity blast events
US20150167584A1 (en) * 2012-08-01 2015-06-18 Mahle International Gmbh Piston
US9689343B2 (en) * 2012-08-01 2017-06-27 Mahle International Gmbh Piston
US20160222912A1 (en) * 2015-01-30 2016-08-04 Federal-Mogul Corporation Piston with cooling gallery cooling insert and method of construction thereof
US10240556B2 (en) * 2015-01-30 2019-03-26 Tenneco Inc. Piston with cooling gallery cooling insert and method of construction thereof

Also Published As

Publication number Publication date
JP2012500354A (en) 2012-01-05
WO2010020231A2 (en) 2010-02-25
WO2010020231A3 (en) 2010-04-15
EP2329126A2 (en) 2011-06-08
DE102008038324A1 (en) 2010-02-25
JP5349596B2 (en) 2013-11-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MAHLE INTERNATIONAL GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOLLOTZEK, HELMUT;REEL/FRAME:025953/0792

Effective date: 20110309

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION