GB2024987A - Oil-cooled Piston - Google Patents

Oil-cooled Piston Download PDF

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Publication number
GB2024987A
GB2024987A GB7923080A GB7923080A GB2024987A GB 2024987 A GB2024987 A GB 2024987A GB 7923080 A GB7923080 A GB 7923080A GB 7923080 A GB7923080 A GB 7923080A GB 2024987 A GB2024987 A GB 2024987A
Authority
GB
United Kingdom
Prior art keywords
pin
piston
eyes
annular groove
groove segment
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
Application number
GB7923080A
Other versions
GB2024987B (en
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 GmbH
Original Assignee
Mahle 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 GmbH filed Critical Mahle GmbH
Publication of GB2024987A publication Critical patent/GB2024987A/en
Application granted granted Critical
Publication of GB2024987B publication Critical patent/GB2024987B/en
Expired 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins

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

Cooling oil for an internal combustion engine piston passes from an engine crank chamber via a connecting rod through a piston pin (3) into an annular groove segment (5) inside the pin eyes (2) of the piston, and from there enters through an aperture in radial direction into ducts (7), (8) leading into a duct (9) the piston head. The annular groove segment (5) in the pin eyes (2) lies below a plane which runs horizontally through the axis of the pin eyes. With this construction the dimensions of the pin eye may be smaller radially than in known constructions or may obtain greater security against cracking by shifting the annular groove segment in the pin eye out of the area which is particularly vulnerable to the danger of cracking. <IMAGE>

Description

SPECIFICATION Oil-cooled Piston The invention relates to an oil-cooled piston for internal combustion engines of the kind in which the cooling oil passes from an engine crank chamber via a connecting rod through a piston pin into an annular groove segment inside the eyes of the piston, and from there enters through an aperture in radial direction into a duct leading into a piston head.
Pistons of this type constitute prior art and are known for example, from US Patent 2 282 085, German registered Design 1725611, German Registered Design 19 79 948, German Patent 14 76 408, German Patent 11 41 494 and German Offenlegungsschrift 21 06 923. In all the aforementioned Patents are shown pistons in which the annular groove segment in the pin eyes extends above and below the horizontal plane running through the axis of the pin eyes. The aperture from which the cooling oil, which is brought from the connecting rod through the piston pin, passes into the duct to the piston head is nearly always situated above the horizontal plane running through the axis of the pin eyes, in known pistons.
In regard to the position of the annular groove segment in the pin eyes, the prior art described generally has the disadvantage that the cavity which inside the pin eye borehole is constantly situated in the direction of movement of the piston in the area in which it is most strongly exposed to the danger of cracking. In order to obtain security against cracking, the pin eyes as a whole, where their radial wall thickness is concerned, must be designed larger than they would have to be if there were no annular groove segments in the aforementioned areas.
Taking this as a starting point, the problem underlying the invention is to be able to make the dimensions of the pin eye smaller radially or obtain greater security against cracking by shifting the annular groove segment in the pin eye out of the area which is particularly exposed to the danger of cracking.
According to the invention there is provided an oil-cooled piston for an internal combustion engine of the kind described in which the annular groove segment in the pin eyes lies below a plane which runs horizontally through the axis of the pin eyes. It is particularly advantageous to allow the annular groove segment to lie at least 100 below the horizontal plane running through the axis of the pin eyes.
An exemplified embodiment is illustrated in the drawing Figure 1 shows a piston as per the invention in longitudinal section with a piston pin.
Figure 2 shows a section through the piston along the line Il-Il without a piston pin.
The piston 1 has pin eyes 2. In the pin eyes 2 is mounted a pin 3 with radial bore-holes 4. From a connecting rod which encircles the pin and is not illustrated, cooling oil passes through the pin 3 via the bore-holes 4 into an annular groove segment 5 in the pin eyes 2. From the annular groove segment 5, the cooling oil passes via an aperture 6 through the ducts 7 and 8 into an annular duct 9 in the piston head. From thore, it flows via a duct 10 from the piston back again into the unillustrated crank chamber of the engine. The ducts 7 and 8 are each closed at their bottom ends by sealing nipples 11.
Claims
1. An oil-cooled piston for internal combustion engines, in which the cooling oil passes from an engine crank chamber via a connecting rod through a piston pin into an annular groove segment inside the eyes of the piston, and from there enters through an aperture in radial direction into a duct leading into the piston head, wherein the annular groove segment in the pin eyes lies below a plane which runs horizontally through the axis of the pin eyes.
2. An oil-cooled piston as claimed in claim 1, wherein the annular groove segment lies at least 10 below the plane which runs horizontally through the axis of the pin eyes.
3. An oil-cooled piston substantially as described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Oil-cooled Piston The invention relates to an oil-cooled piston for internal combustion engines of the kind in which the cooling oil passes from an engine crank chamber via a connecting rod through a piston pin into an annular groove segment inside the eyes of the piston, and from there enters through an aperture in radial direction into a duct leading into a piston head. Pistons of this type constitute prior art and are known for example, from US Patent 2 282 085, German registered Design 1725611, German Registered Design 19 79 948, German Patent 14 76 408, German Patent 11 41 494 and German Offenlegungsschrift 21 06 923. In all the aforementioned Patents are shown pistons in which the annular groove segment in the pin eyes extends above and below the horizontal plane running through the axis of the pin eyes. The aperture from which the cooling oil, which is brought from the connecting rod through the piston pin, passes into the duct to the piston head is nearly always situated above the horizontal plane running through the axis of the pin eyes, in known pistons. In regard to the position of the annular groove segment in the pin eyes, the prior art described generally has the disadvantage that the cavity which inside the pin eye borehole is constantly situated in the direction of movement of the piston in the area in which it is most strongly exposed to the danger of cracking. In order to obtain security against cracking, the pin eyes as a whole, where their radial wall thickness is concerned, must be designed larger than they would have to be if there were no annular groove segments in the aforementioned areas. Taking this as a starting point, the problem underlying the invention is to be able to make the dimensions of the pin eye smaller radially or obtain greater security against cracking by shifting the annular groove segment in the pin eye out of the area which is particularly exposed to the danger of cracking. According to the invention there is provided an oil-cooled piston for an internal combustion engine of the kind described in which the annular groove segment in the pin eyes lies below a plane which runs horizontally through the axis of the pin eyes. It is particularly advantageous to allow the annular groove segment to lie at least 100 below the horizontal plane running through the axis of the pin eyes. An exemplified embodiment is illustrated in the drawing Figure 1 shows a piston as per the invention in longitudinal section with a piston pin. Figure 2 shows a section through the piston along the line Il-Il without a piston pin. The piston 1 has pin eyes 2. In the pin eyes 2 is mounted a pin 3 with radial bore-holes 4. From a connecting rod which encircles the pin and is not illustrated, cooling oil passes through the pin 3 via the bore-holes 4 into an annular groove segment 5 in the pin eyes 2. From the annular groove segment 5, the cooling oil passes via an aperture 6 through the ducts 7 and 8 into an annular duct 9 in the piston head. From thore, it flows via a duct 10 from the piston back again into the unillustrated crank chamber of the engine. The ducts 7 and 8 are each closed at their bottom ends by sealing nipples 11. Claims
1. An oil-cooled piston for internal combustion engines, in which the cooling oil passes from an engine crank chamber via a connecting rod through a piston pin into an annular groove segment inside the eyes of the piston, and from there enters through an aperture in radial direction into a duct leading into the piston head, wherein the annular groove segment in the pin eyes lies below a plane which runs horizontally through the axis of the pin eyes.
2. An oil-cooled piston as claimed in claim 1, wherein the annular groove segment lies at least 10 below the plane which runs horizontally through the axis of the pin eyes.
3. An oil-cooled piston substantially as described with reference to the accompanying drawings.
GB7923080A 1978-07-05 1979-07-03 Oil-cooledpiston Expired GB2024987B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782829494 DE2829494A1 (en) 1978-07-05 1978-07-05 OIL COOLED PISTON FOR COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
GB2024987A true GB2024987A (en) 1980-01-16
GB2024987B GB2024987B (en) 1982-09-02

Family

ID=6043583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7923080A Expired GB2024987B (en) 1978-07-05 1979-07-03 Oil-cooledpiston

Country Status (6)

Country Link
JP (1) JPS5512291A (en)
BR (1) BR7904232A (en)
DE (1) DE2829494A1 (en)
ES (1) ES482188A1 (en)
FR (1) FR2430517A1 (en)
GB (1) GB2024987B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523625A1 (en) * 1991-07-15 1993-01-20 Alcan Deutschland Gmbh Piston for an internal combustion engine
US20170298862A1 (en) * 2016-04-13 2017-10-19 Toyota Jidosha Kabushiki Kaisha Internal combustion engine
CN111868367A (en) * 2018-02-01 2020-10-30 大众汽车股份公司 Reciprocating piston for a reciprocating piston internal combustion engine and use of a reciprocating piston in a reciprocating piston internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4410141B4 (en) * 1994-03-24 2008-05-08 Mahle Gmbh Closing of production-related holes in pistons with cooling channel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282085A (en) * 1941-08-13 1942-05-05 American Locomotive Co Piston
FR2079873A5 (en) * 1970-02-16 1971-11-12 Semt

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523625A1 (en) * 1991-07-15 1993-01-20 Alcan Deutschland Gmbh Piston for an internal combustion engine
US20170298862A1 (en) * 2016-04-13 2017-10-19 Toyota Jidosha Kabushiki Kaisha Internal combustion engine
CN107288703A (en) * 2016-04-13 2017-10-24 丰田自动车株式会社 Internal combustion engine
CN111868367A (en) * 2018-02-01 2020-10-30 大众汽车股份公司 Reciprocating piston for a reciprocating piston internal combustion engine and use of a reciprocating piston in a reciprocating piston internal combustion engine
CN111868367B (en) * 2018-02-01 2022-05-27 大众汽车股份公司 Reciprocating piston for a reciprocating piston internal combustion engine and use of a reciprocating piston in a reciprocating piston internal combustion engine

Also Published As

Publication number Publication date
JPS5512291A (en) 1980-01-28
GB2024987B (en) 1982-09-02
BR7904232A (en) 1980-04-15
FR2430517B1 (en) 1982-11-19
DE2829494A1 (en) 1980-01-17
FR2430517A1 (en) 1980-02-01
ES482188A1 (en) 1980-04-01

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PCNP Patent ceased through non-payment of renewal fee