NO20190717A1 - Cooling sleeve for a cylinder head - Google Patents

Cooling sleeve for a cylinder head Download PDF

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Publication number
NO20190717A1
NO20190717A1 NO20190717A NO20190717A NO20190717A1 NO 20190717 A1 NO20190717 A1 NO 20190717A1 NO 20190717 A NO20190717 A NO 20190717A NO 20190717 A NO20190717 A NO 20190717A NO 20190717 A1 NO20190717 A1 NO 20190717A1
Authority
NO
Norway
Prior art keywords
cooling sleeve
cylinder head
cooling
apertures
sleeve
Prior art date
Application number
NO20190717A
Other versions
NO346039B1 (en
Inventor
Henrik Fjellanger
Isak Stamnes
Olav Øyvind Førde
Original Assignee
Bergen Engines As
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 Bergen Engines As filed Critical Bergen Engines As
Priority to NO20190717A priority Critical patent/NO346039B1/en
Publication of NO20190717A1 publication Critical patent/NO20190717A1/en
Publication of NO346039B1 publication Critical patent/NO346039B1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • F01P3/16—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Field of the invention
The present invention relates to a cooling sleeve for a cylinder head of an internal combustion engine, and a cylinder head with a cooling sleeve.
Background of the invention
A cooling sleeve is a component designed to capture cooling water and redistribute it at strategically placed locations to increase the cooling efficiency of engine exhaust ports, without inducing unnecessary restrictions and pressure loss in the cooling water circuit.
The current design leaves the water flow free to move in any direction as it exits the flamedeck and enters the “main volume” of the cylinder head. The water comes up through the liner and via bores in the flamedeck before passing the prechamber nozzle and holder.
This leaves a lot of freedom of movement for the water and roughly half of it will be spent on “cooling” the intake ports, which does not need cooling. In fact heating them, as the intake air can be 55degC and the water 85degC.
Disclosure of the state of art
US2017167432 A1 disclose a water jacket for a cylinder head of an internal combustion engine, and includes a coolant chamber arranged to permit the flow of coolant within the water jacket and a coolant conduit positioned to permit the flow of coolant proximate to a recess for receiving an exhaust valve mounted to the cylinder head. The coolant conduit is in fluid communication with the coolant chamber, and the coolant conduit is shaped as a complex curve. A water jacket includes a pair of apertures arranged to receive a spark plug and a fuel injector. The apertures are separated by a separating member, and a coolant chamber is arranged to permit the flow of coolant about the apertures. The separating member includes a coolant channel in fluid communication with the coolant chamber so as to permit the flow of coolant between the apertures.
Further, GB583652 A, US3818878 A, GB1100511 A, and CN105464831 A relates to improved cylinder head cooling.
Objects of the present invention
The cooling sleeve according to the invention is designed to trap cooling water coming up through the flamedeck of a cylinder head and pointing it in the direction for optimal cooling of exhaust ports.
Strategic holes/apertures in different shapes can be cut out of the cooling sleeve surface/wall to create a flow field that increases cooling on the exhaust ports.
The cooling sleeve can also be used to improve cooling of a prechamber unit in the cylinder head.
The cooling sleeve can completely close the domain between the flamedeck and a “main" volume in the cylinder head, except from the cutout apertures in the sleeve. Either the sleeve can be retrofitted to existing cylinder heads as a machined component or it can be included in the casting.
Mounting of the cooling sleeve can be done in numerous ways without affecting the function. For instance, a cooling sleeve can be threaded onto the prechamber unit of the engine, or a cooling sleeve can be installed in the cylinder head separate from the prechamber unit. Other methods could also be used.
The selected mounting method should lock the sleeve in its correct rotational direction, to ensure that the cutout apertures are oriented towards their desired targets.
Summary of the invention
The above objects are achieved with a cooling sleeve for a cylinder head of an internal combustion engine, the cooling sleeve comprising:
a circular and cylindrical cooling sleeve with a through running internal bore, said cooling sleeve is enveloping a prechamber unit in a water-jacket chamber in the cylinder head, and
said cooling sleeve comprises a number of apertures permitting flow of coolant, for cooling exhaust ports in said water-jacket chamber.
The apertures can be of different shapes to create a flow field of coolant, increasing cooling of said exhaust ports in the cylinder head.
At least one of the apertures can be a straight slit in an outer wall of the cooling sleeve.
At least one of the apertures can be an L-shaped or curved slit in an outer wall of the cooling sleeve.
At least one of the apertures can be a hole in an outer wall of the cooling sleeve.
The cooling sleeve can be in the shape of a piece of pipe.
The above objects are also achieved with a cylinder head of an internal combustion engine, comprising a water-jacket chamber with exhaust ports and a prechamber unit, the cylinder head further comprising:
a circular and cylindrical cooling sleeve with a through running internal bore, said sleeve is enveloping the prechamber unit in the water-jacket chamber in the cylinder head, and
said cooling sleeve comprises a number of apertures permitting flow of coolant, for cooling exhaust ports in said water-jacket chamber.
Said cooling sleeve can envelop the prechamber unit in the cylinder head, and run down to or into a flamedeck of the cylinder head.
Said cooling sleeve is designed to trap coolant coming up through the flamedeck and to direct the coolant in the direction of the exhaust ports in the water-jacket chamber.
A top part of said cooling sleeve can be engaged with a prechamber holder.
A top part of said cooling sleeve can be engaged with a cylinder head housing.
Said cooling sleeve can be mounted with the apertures facing their desired target exhaust ports.
The apertures of the cooling sleeve can be of different shapes to create a flow field of coolant, increasing cooling of exhaust ports in the cylinder head.
At least one of the apertures of the cooling sleeve can be a straight slit in an outer wall of the sleeve, and/or wherein at least one of the apertures can be an L-shaped or curved slit in the outer wall of the sleeve, and/or wherein at least one of the apertures can be a hole in the outer wall of the sleeve.
Description of the figures
Embodiments of the present invention will now be described, by way of example only, with reference to the following figures, wherein:
Figure 1 shows a cross sectional view of a cylinder head with a cooling sleeve according to the invention.
Figure 2 shows a perspective and cross sectional view of a cylinder head with a cooling sleeve according to the invention.
Figure 3 shows a prechamber unit in the cylinder head surrounded by a cooling sleeve according to the invention.
Figure 4 shows a cooling sleeve according to the invention.
Figure 5 shows a cooling sleeve according to the invention.
Description of preferred embodiments of the invention
The present invention relates in the main to use in a cylinder head with a prechamber for a lean-burn gas engine, but the invention can also be used in other gas engines. In a lean-burn gas engine (Otto engine), the cylinder is filled with a homogenous, lean mixture of air and fuel gas. To achieve a steady and safe ignition of the charge, an ignition amplifier in the form of a prechamber is often used, where the charge is made richer in that the fuel gas is supplied through a separate prechamber gas valve, and where an ignition means in the form of for example a spark plug or pilot injection valve is located. The prechamber is a substantial contributor to the formation of NOx during the combustion. Furthermore, the prechamber is subjected to high thermal loads and requires much cooling. Reduced size and subsequent reduced amount of energy released in the prechamber also leads to a gain in the form of lower thermal load and reduced wear on the ignition means and prechamber gas valve.
When the prechamber is referred to in a technical context, it is meant the prechamber volume, i.e. the volume of the nozzle part independent of the construction/division. As a structural part, the whole unit can be defined as a prechamber unit, which in the main is comprised of a prechamber retainer (upper part) and a prechamber nozzle (lower part).
The prechamber unit 30 shown in the drawings may comprise an elongated body with several borings arranged side by side. A first boring can comprise a prechamber gas valve, for example in the form of a non-return valve such as a ball valve, and a second boring can comprise an ignition means, for example in the form of a spark plug, a pilot injection valve, or another similar ignition mechanism.
Figure 1 and 2 show the prechamber unit 30 installed in a cylinder head 20. The cylinder head 20 is designed as a conventional cylinder head for a combustion engine, as well known to a person skilled in the art, and it is therefore not disclosed in detail.
The prechamber unit 30 can be installed in the cylinder head 20 using a prechamber holder 18 screwed to or otherwise fastened to an upper part of a cylinder head housing 22. The prechamber unit 30 is normally installed in a vertical position, and runs from the prechamber holder 18 and into a flamedeck 32 in a lower part of the cylinder head housing 22. The cylinder head 20 is normally covered by a cylinder cover 28.
The prechamber unit 30 is installed in a "main" volume that can be referred to as a water-jacket chamber 24. One or more exhaust ports 26 runs from the engine and through said water-jacket chamber 24. Cooling water comes up through the liner and via bores in the flamedeck 32 (indicated by the arrows in fig.2-3) before passing the prechamber nozzle 30a. In fig.2 only the lower prechamber nozzle 30a is visible, as the rest of the prechamber unit 30 is enveloped or surrounded by a circular and cylindrical cooling sleeve 10 with a through running internal bore 12 enveloping the main body of the prechamber unit 30.
Mounting the cooling sleeve 10 as shown will trap the water coming up through the flamedeck 32 and direct the cooling water for optimal cooling of the exhaust ports 26 in the water-jacket chamber 24. The cooling sleeve 10 will thus close the domain between the flamedeck 32 and the water-jacket chamber 24, except from cutout apertures in the sleeve 10.
Fig.3 shows in more detail the cooling sleeve 10 mounted between the prechamber holder 18 and the flamedeck 32. The upper part of the cooling sleeve 10 can be threaded engaged to the prechamber holder 18 or just inserted in the prechamber holder 18 with a snug fit. The cooling sleeve 10 can optional be connected or engaged to the upper part of the cylinder head housing 22. The lower part of the cooling sleeve 10 can be connected or engaged to the flamedeck 32 in a similar manner.
As particularly shown in fig.4 and 5 the cooling sleeve is designed as a circular and cylindrical sleeve 10 with a through running internal bore 12, and the wall 10a of the cooling sleeve 10 comprises a number of apertures 14a,14b,14c permitting flow of coolant, such as water, for cooling the exhaust ports 26 in said water-jacket chamber 24.
The cooling sleeve 10 can have one or several apertures, and possibly several apertures of similar type. For instance, at least one of the apertures 14a of the cooling sleeve 10 is a straight slit, and/or at least one of the apertures 14b is an L-shaped or curved slit, and/or at least one of the apertures 14c is a hole in the outer wall 10a of the sleeve 10. The number of apertures and design of the apertures may vary dependent on the cylinder head design.

Claims (14)

Claims
1. A cooling sleeve for a cylinder head (20) of an internal combustion engine, the cooling sleeve comprising:
a circular and cylindrical cooling sleeve (10) with a through running internal bore (12), said cooling sleeve (10) is enveloping a prechamber unit (30) in a waterjacket chamber (24) in the cylinder head (20), and
said cooling sleeve (10) comprises a number of apertures (14a,14b,14c) permitting flow of coolant, for cooling exhaust ports (26) in said water-jacket chamber (24).
2. Cooling sleeve according to claim 1, wherein said apertures (14a,14b,14c) are of different shapes to create a flow field of coolant, increasing cooling of said exhaust ports (26) in the cylinder head (20).
3. Cooling sleeve according to claim 1, wherein at least one of the apertures (14a) is a straight slit in an outer wall (10a) of the cooling sleeve (10).
4. Cooling sleeve according to claim 1, wherein at least one of the apertures (14b) is an L-shaped or curved slit in an outer wall (10a) of the cooling sleeve (10).
5. Cooling sleeve according to claim 1, wherein at least one of the apertures (14c) is a hole in an outer wall (10a) of the cooling sleeve (10).
6. Cooling sleeve according to claim 1, wherein said cooling sleeve (10) is shaped as a piece of pipe.
7. Cylinder head (20) of an internal combustion engine, comprising a waterjacket chamber (24) with exhaust ports (26) and a prechamber unit (30), the cylinder head (20) further comprising:
a circular and cylindrical cooling sleeve (10) with a through running internal bore (12), said cooling sleeve (10) is enveloping the prechamber unit (30) in the water-jacket chamber (24) in the cylinder head (20), and
said cooling sleeve (10) comprises a number of apertures (14a,14b,14c) permitting flow of coolant, for cooling exhaust ports (26) in said water-jacket chamber (24).
8. Cylinder head (20) according to claim 7, wherein said cooling sleeve (10) envelop the prechamber unit (30) in the cylinder head (20), and runs down to or into a flamedeck (32) of the cylinder head (20).
9. Cylinder head (20) according to claim 8, wherein said cooling sleeve (10) is designed to trap coolant coming up through the flamedeck (32) and to direct the coolant in the direction of the exhaust ports (26) in the water-jacket chamber (24).
10. Cylinder head (20) according to claim 7, wherein a top part of said cooling sleeve (10) is engaged with a prechamber holder (18).
11. Cylinder head (20) according to claim 7, wherein a top part of said cooling sleeve (10) is engaged with a cylinder head housing (22).
12. Cylinder head (20) according to claim 7, wherein said cooling sleeve (10) is mounted with the apertures (14a,14b,14c) facing their desired target exhaust ports (26).
13. Cylinder head (20) according to claim 7, wherein said apertures (14a,14b,14c) of the cooling sleeve (10) are of different shapes to create a flow field of coolant, increasing cooling of exhaust ports (26) in the cylinder head (20).
14. Cylinder head (20) according to claim 1, wherein at least one of the apertures (14a) of the cooling sleeve (10) is a straight slit in an outer wall (10a) of the cooling sleeve (10), and/or wherein at least one of the apertures (14b) is an L-shaped or curved slit in the outer wall (10a) of the cooling sleeve (10), and/or wherein at least one of the apertures (14c) is a hole in the outer wall (10a) of the cooling sleeve (10).
NO20190717A 2019-06-17 2019-06-17 Cooling sleeve for a cylinder head NO346039B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO20190717A NO346039B1 (en) 2019-06-17 2019-06-17 Cooling sleeve for a cylinder head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO20190717A NO346039B1 (en) 2019-06-17 2019-06-17 Cooling sleeve for a cylinder head

Publications (2)

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NO20190717A1 true NO20190717A1 (en) 2020-12-18
NO346039B1 NO346039B1 (en) 2022-01-17

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB762792A (en) * 1953-04-21 1956-12-05 Nydqvist & Holm Ab Improvements relating to the cooling of the fuel nozzles of internal combustion engines
US3420215A (en) * 1965-12-10 1969-01-07 Maybach Mercedes Benz Motorenb Liquid-cooled cylinder head for internal combustion engines
US6279516B1 (en) * 2000-02-16 2001-08-28 Deere & Company Cylinder head with two-plane water jacket
US20070228191A1 (en) * 2006-03-31 2007-10-04 Caterpillar Inc. Cooled nozzle assembly for urea/water injection
US20120037124A1 (en) * 2010-08-11 2012-02-16 Cummins Intellectual Properties, Inc. Engine with injector mounting and cooling arrangement
US20150211410A1 (en) * 2012-08-01 2015-07-30 Perkins Engines Company Limited Engine Component Sleeve with an Integrated Heat Transfer Arrangement
US20180142654A1 (en) * 2015-04-14 2018-05-24 Ge Jenbacher Gmbh & Co Og Assembly consisting of a cylinder head and a fuel injector
US20190017464A1 (en) * 2017-07-11 2019-01-17 Man Truck & Bus Ag Press-fit sleeve for a cylinder head

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB762792A (en) * 1953-04-21 1956-12-05 Nydqvist & Holm Ab Improvements relating to the cooling of the fuel nozzles of internal combustion engines
US3420215A (en) * 1965-12-10 1969-01-07 Maybach Mercedes Benz Motorenb Liquid-cooled cylinder head for internal combustion engines
US6279516B1 (en) * 2000-02-16 2001-08-28 Deere & Company Cylinder head with two-plane water jacket
US20070228191A1 (en) * 2006-03-31 2007-10-04 Caterpillar Inc. Cooled nozzle assembly for urea/water injection
US20120037124A1 (en) * 2010-08-11 2012-02-16 Cummins Intellectual Properties, Inc. Engine with injector mounting and cooling arrangement
US20150211410A1 (en) * 2012-08-01 2015-07-30 Perkins Engines Company Limited Engine Component Sleeve with an Integrated Heat Transfer Arrangement
US20180142654A1 (en) * 2015-04-14 2018-05-24 Ge Jenbacher Gmbh & Co Og Assembly consisting of a cylinder head and a fuel injector
US20190017464A1 (en) * 2017-07-11 2019-01-17 Man Truck & Bus Ag Press-fit sleeve for a cylinder head

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Publication number Publication date
NO346039B1 (en) 2022-01-17

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