EP2920447A1 - Cylinder head - Google Patents

Cylinder head

Info

Publication number
EP2920447A1
EP2920447A1 EP13792410.6A EP13792410A EP2920447A1 EP 2920447 A1 EP2920447 A1 EP 2920447A1 EP 13792410 A EP13792410 A EP 13792410A EP 2920447 A1 EP2920447 A1 EP 2920447A1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
injector sleeve
injector
cooling liquid
sleeve
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
EP13792410.6A
Other languages
German (de)
French (fr)
Other versions
EP2920447B1 (en
Inventor
Diego PAULUZZI
Gabriele COLLOVATI
Michele CERNIGOJ
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.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
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 Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2920447A1 publication Critical patent/EP2920447A1/en
Application granted granted Critical
Publication of EP2920447B1 publication Critical patent/EP2920447B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a cylinder head of a reciprocating engine.
  • the fuel injector is disposed in the injector sleeve, which, in turn, is disposed in a bore in the cylinder head.
  • the fuel injector and the injector sleeve are cooled by cooling liquid which is fed into a cooling liquid space surrounding the injector sleeve.
  • the lower and upper portions of the injector sleeve are attached to the cylinder head by shrink-fit connections such that the cooling liquid space is between the connections.
  • the shrink-fit connections prevent leakage of cooling liquid from the cooling liquid space.
  • the cylinder head deflection due to firing pressure can cause relative movements between the cylinder head and the injector sleeve especially in the lower shrink-fit connection, in which the thermal expansion reduces the initial press force. These movements may result in the fretting at the contact area of the lower shrink-fit connection, which can cause cooling liquid leakages into the fuel injector housing.
  • the object of the present invention is to provide an improved cylinder head for a reciprocating engine.
  • the object of the present invention can be achieved by a cylinder head accord- ing to claim 1 .
  • the cylinder head according to the invention comprises a body having a bore for receiving an injector sleeve, in which a fuel injector can be inserted, an injector sleeve inserted in the bore, and a cooling liquid space surrounding the injector sleeve.
  • the injector sleeve comprises a lower portion that is below the cooling liquid space and an upper portion that is above the cooling liquid space. The upper portion is attached to the body.
  • An annular seal is arranged between the lower portion of the injector sleeve and the body and the lower portion of the injector sleeve is mechanically uncoupled from the body.
  • the upper part of the injector sleeve is attached to the body of the cylinder head and the lower portion of the injector sleeve is mechanically uncoupled from the body.
  • the connection of the upper portion keeps the injector sleeve in its position in the bore and the lower portion of the injector sleeve can freely follow the movements of the cylinder head as the combustion pressure deflects the cylinder head lower part (i.e. flame plate).
  • the annular seal prevents cooling liquid leakages from the cooling liquid space. Like this, a reliable sealing arrangement can be accomplished.
  • the design according to the invention can be used both in new cylinder heads and as a repair solution in old ones.
  • Fig. 1 is a cross sectional view of a cylinder head according to an embodiment of the invention
  • Fig. 2 is a cross sectional view of cylinder head of fig. 1 with an injector inserted in an injector sleeve
  • Fig. 1 is a cross sectional view of a cylinder head according to an embodiment of the invention
  • Fig. 2 is a cross sectional view of cylinder head of fig. 1 with an injector inserted in an injector sleeve
  • Fig.3 is an enlargement of a Fig.2 detail.
  • the drawing shows a cylinder head 1 of a reciprocating engine.
  • the engine is a large diesel engine, which can be used as a main and/or an auxiliary engine in ships and/or in power plants for generation of electricity and/or heat.
  • the engine is a medium speed, four-stroke engine.
  • the maximum rotational speed of the engine is 300-1200 rpm.
  • Cylinders 7 of the engine can be arranged in a single bank or in two banks in a V-configu ration.
  • the engine has 6-20 cylinders.
  • the cylinder bore is typically 16-64 cm. Each cylinder is provided with a separate cylinder head 1 .
  • the cylinder head 1 comprises a body 2 having a lower surface 3 that forms an upper surface of a combustion chamber 7 of the cylinder.
  • the body 2 is provided with a bore 4 for receiving an injector sleeve 5, in which a fuel injector 6 can be inserted.
  • the injector sleeve 5 is inserted in the bore 4.
  • the fuel injector 6 is inserted in the injector sleeve 5.
  • the fuel injector 6 is mechanically uncoupled from the injector sleeve 5.
  • the internal diameter of the sleeve 5 is greater than the external diameter of the injector 5.
  • the fuel injector 6 faces the inner surface of the injector sleeve.
  • the body 2 comprises a cooling liquid space 8 for cooling liquid.
  • the cooling liquid space 8 can be implemented in the form of a cooling water jacket, a cavity or a cooling channel.
  • the cooling liquid space 8 surrounds the injector sleeve 5.
  • the injector sleeve 5 comprises a lower portion 9 that is below the cooling liquid space 8.
  • the injector sleeve has an upper portion 10 that is above the cooling liquid space 8.
  • the lower portion 9 of the injector sleeve is below the lowermost edge between the cooling liquid space 8 and the bore 4.
  • the upper portion 10 is above the uppermost edge between the cooling liquid space 8 and the bore 4.
  • the body 2 comprises two or more cooling liq- uid spaces that surround the injector sleeve 5
  • the lower portion of the injector sleeve is below the lowermost cooling liquid space and the upper portion above the uppermost cooling liquid space.
  • An upper portion 10 of the injector sleeve 5 is attached to the body 2.
  • the upper portion 10 can be attached to the body 2 by a shrink fit.
  • the lower portion 9 of the injector sleeve is mechanically uncoupled from the body 2.
  • An annular seal 13, for example an O-ring, is arranged between the lower portion 9 of the injector sleeve and the body 2.
  • the annular seal 13 is arranged between the outer diameter of injector sleeve 5 and the bore 4.
  • the annular seal 13 prevents cooling liquid leakages from the cooling liquid space 8 into the injector housing.
  • the annular seal 13 can be made of perf!uoroelastomer (FFKM).
  • FFKM perf!uoroelastomer
  • the outer surface of the injector sleeve 5 comprises an annular groove 14, in which the annular seal 13 is placed.
  • the annular groove 14 is in flow connection with the cooling liquid space 8 through a gap 15 between the injec- tor sleeve 5 and the body 2. With this solution the annular seal 13 stays wet, which increases its lifetime.
  • the portion of the injector sleeve 5, which is below the annular seal 13, is mechanically uncoupled from the body 2.
  • the bore 3 comprises an annular shoulder 16, to which a lower end 1 1 of the injector sleeve is supported. Also the fuel injector 6 is supported to the annular shoulder 16. A sealing ring 17 is arranged between the annular shoulder 16 and the fuel injector 6. The sealing ring 17 prevents the entering of combustion gases into the injector sleeve 5.
  • a clearance 18 is provided between the bore wall and the lower portion 9 of the injector sleeve.
  • the clearance 18 enables the movements of the injector sleeve 5 in relation to the body 2 during the engine operation.
  • the size of the clearance in engine working conditions is at most 40 ⁇ . In installation conditions there can be a slight interference between the lower portion of injector sleeve and the bore. In the engine working conditions (temperature) the temperature difference between the injector sleeve and the bore is such that the bore 4 is expanding more than the injector sleeve 5 and no interference exists.
  • Drive fit H7/m6 can be used between the body and the lower portion 9 of the injector sleeve.
  • the clearance is provided between the body 2 and the injector sleeve portion that is below the annular seal 13.
  • the edge between the cooling liquid space and the lower portion of the bore is provided with a chamfer 19.
  • the dimensions of the chamfer 19 can be 2x20°.

Landscapes

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

Abstract

A cylinder head (1) of a reciprocating engine, the cylinder head (1) comprising a body (2) having a bore (4) for receiving an injector sleeve (5), in which a fuel injector (6) can be inserted, an injector sleeve (5) inserted in the bore (4), and a cooling liquid space (8) surrounding the injector sleeve (5). The injector sleeve (5) comprises a lower portion (9) that is below the cooling liquid space (8) and an upper portion (10) that is above the cooling liquid space (8), which upper portion (10) is attached to the body (2). An annular seal (13) is arranged between the lower portion (9) of the injector sleeve and the body (2) and the lower portion (9) of the injector sleeve is mechanically uncoupled from the body (2).

Description

Cylinder head
The invention relates to a cylinder head of a reciprocating engine.
In large diesel engines the fuel injector is disposed in the injector sleeve, which, in turn, is disposed in a bore in the cylinder head. The fuel injector and the injector sleeve are cooled by cooling liquid which is fed into a cooling liquid space surrounding the injector sleeve. Typically the lower and upper portions of the injector sleeve are attached to the cylinder head by shrink-fit connections such that the cooling liquid space is between the connections. The shrink-fit connections prevent leakage of cooling liquid from the cooling liquid space.
During the engine operation the cylinder head deflection due to firing pressure can cause relative movements between the cylinder head and the injector sleeve especially in the lower shrink-fit connection, in which the thermal expansion reduces the initial press force. These movements may result in the fretting at the contact area of the lower shrink-fit connection, which can cause cooling liquid leakages into the fuel injector housing.
The object of the present invention is to provide an improved cylinder head for a reciprocating engine.
The object of the present invention can be achieved by a cylinder head accord- ing to claim 1 .
The cylinder head according to the invention comprises a body having a bore for receiving an injector sleeve, in which a fuel injector can be inserted, an injector sleeve inserted in the bore, and a cooling liquid space surrounding the injector sleeve. The injector sleeve comprises a lower portion that is below the cooling liquid space and an upper portion that is above the cooling liquid space. The upper portion is attached to the body. An annular seal is arranged between the lower portion of the injector sleeve and the body and the lower portion of the injector sleeve is mechanically uncoupled from the body. According to the invention the upper part of the injector sleeve is attached to the body of the cylinder head and the lower portion of the injector sleeve is mechanically uncoupled from the body. The connection of the upper portion keeps the injector sleeve in its position in the bore and the lower portion of the injector sleeve can freely follow the movements of the cylinder head as the combustion pressure deflects the cylinder head lower part (i.e. flame plate). The annular seal prevents cooling liquid leakages from the cooling liquid space. Like this, a reliable sealing arrangement can be accomplished. Additionally, the design according to the invention can be used both in new cylinder heads and as a repair solution in old ones.
In the following the invention will be described by way of an example with reference to the accompanying drawings, in which
Fig. 1 is a cross sectional view of a cylinder head according to an embodiment of the invention, Fig. 2 is a cross sectional view of cylinder head of fig. 1 with an injector inserted in an injector sleeve, and
Fig.3 is an enlargement of a Fig.2 detail.
The drawing shows a cylinder head 1 of a reciprocating engine. The engine is a large diesel engine, which can be used as a main and/or an auxiliary engine in ships and/or in power plants for generation of electricity and/or heat. The engine is a medium speed, four-stroke engine. The maximum rotational speed of the engine is 300-1200 rpm. Cylinders 7 of the engine can be arranged in a single bank or in two banks in a V-configu ration. Typically, the engine has 6-20 cylinders. The cylinder bore is typically 16-64 cm. Each cylinder is provided with a separate cylinder head 1 .
The cylinder head 1 comprises a body 2 having a lower surface 3 that forms an upper surface of a combustion chamber 7 of the cylinder. The body 2 is provided with a bore 4 for receiving an injector sleeve 5, in which a fuel injector 6 can be inserted. The injector sleeve 5 is inserted in the bore 4. The fuel injector 6 is inserted in the injector sleeve 5. The fuel injector 6 is mechanically uncoupled from the injector sleeve 5. The internal diameter of the sleeve 5 is greater than the external diameter of the injector 5. The fuel injector 6 faces the inner surface of the injector sleeve.
The body 2 comprises a cooling liquid space 8 for cooling liquid. The cooling liquid space 8 can be implemented in the form of a cooling water jacket, a cavity or a cooling channel. The cooling liquid space 8 surrounds the injector sleeve 5. The injector sleeve 5 comprises a lower portion 9 that is below the cooling liquid space 8. Further, the injector sleeve has an upper portion 10 that is above the cooling liquid space 8. The lower portion 9 of the injector sleeve is below the lowermost edge between the cooling liquid space 8 and the bore 4. The upper portion 10 is above the uppermost edge between the cooling liquid space 8 and the bore 4. In case the body 2 comprises two or more cooling liq- uid spaces that surround the injector sleeve 5, the lower portion of the injector sleeve is below the lowermost cooling liquid space and the upper portion above the uppermost cooling liquid space.
An upper portion 10 of the injector sleeve 5 is attached to the body 2. The upper portion 10 can be attached to the body 2 by a shrink fit. The lower portion 9 of the injector sleeve is mechanically uncoupled from the body 2. An annular seal 13, for example an O-ring, is arranged between the lower portion 9 of the injector sleeve and the body 2. The annular seal 13 is arranged between the outer diameter of injector sleeve 5 and the bore 4. The annular seal 13 prevents cooling liquid leakages from the cooling liquid space 8 into the injector housing. The annular seal 13 can be made of perf!uoroelastomer (FFKM). Thus, the annular seal 13 can be used in high temperature conditions, up to 270°C. The outer surface of the injector sleeve 5 comprises an annular groove 14, in which the annular seal 13 is placed. The annular groove 14 is in flow connection with the cooling liquid space 8 through a gap 15 between the injec- tor sleeve 5 and the body 2. With this solution the annular seal 13 stays wet, which increases its lifetime. The portion of the injector sleeve 5, which is below the annular seal 13, is mechanically uncoupled from the body 2.
The bore 3 comprises an annular shoulder 16, to which a lower end 1 1 of the injector sleeve is supported. Also the fuel injector 6 is supported to the annular shoulder 16. A sealing ring 17 is arranged between the annular shoulder 16 and the fuel injector 6. The sealing ring 17 prevents the entering of combustion gases into the injector sleeve 5.
A clearance 18 is provided between the bore wall and the lower portion 9 of the injector sleeve. The clearance 18 enables the movements of the injector sleeve 5 in relation to the body 2 during the engine operation. The size of the clearance in engine working conditions is at most 40 μιτι. In installation conditions there can be a slight interference between the lower portion of injector sleeve and the bore. In the engine working conditions (temperature) the temperature difference between the injector sleeve and the bore is such that the bore 4 is expanding more than the injector sleeve 5 and no interference exists. Drive fit H7/m6 can be used between the body and the lower portion 9 of the injector sleeve. The clearance is provided between the body 2 and the injector sleeve portion that is below the annular seal 13.
The edge between the cooling liquid space and the lower portion of the bore is provided with a chamfer 19. The dimensions of the chamfer 19 can be 2x20°.

Claims

Claims:
1 . A cylinder head (1 ) of a reciprocating engine, the cylinder head (1 ) comprising:
- a body (2) having a bore (4) for receiving an injector sleeve (5), in which a fuel injector (6) can be inserted,
- an injector sleeve (5) inserted in the bore (4) and
- a cooling liquid space (8) surrounding the injector sleeve (5), which injector sleeve (5) comprises a lower portion (9) that is below the cooling liquid space (8) and an upper portion (10) that is above the cool- ing liquid space (8), which upper portion (10) is attached to the body (2), characterized in that an annular seal (13) is arranged between the lower portion (9) of the injector sleeve and the body (2), and that the lower portion (9) of the injector sleeve is mechanically uncoupled from the body (2).
2. The cylinder head (1 ) according to claim 1 , characterized in that a clear- ance (18) is provided between the body (2) and the lower portion (9) of the injector sleeve.
3. The cylinder head (1 ) according to claim 2, characterized in that a size of the clearance (18) is at most 40 μιτι.
4. The cylinder head (1 ) according to claim 1 , characterized in an outer sur- face of the injector sleeve (5) comprises an annular groove (14), in which the annular seal (13) is placed.
5. The cylinder head (1 ) according to claim 4, characterized in the annular groove (14) is in flow connection with the cooling liquid space (8).
6. The cylinder head (1 ) according to claim 1 , characterized in that the bore (3) comprises an annular shoulder (16), to which a lower end (1 1 ) of the injector sleeve (5) is supported.
7. The cylinder head (1 ) according to claim 6, characterized in that a sealing ring(17) is arranged between the annular shoulder (16) and the injector (6).
8. The cylinder head (1 ) according to claim 2 or 3, characterized in that the clearance (18) is provided between the body (2) and the injector sleeve portion that is below the annular seal (13).
9. The cylinder head (1 ) according to claim 1 , characterized in that an edge between the cooling liquid space (8) and a lower portion of the bore is provided with a chamfer (19).
10. The cylinder head (1 ) according to claim 1 , characterized in that the injector sleeve (5) is a one-piece part.
1 1 . The cylinder head (1 ) according to claim 1 , characterized in that the upper portion (10) of the injector sleeve is attached to the body (3) by a shrink fit.
EP13792410.6A 2012-10-25 2013-10-14 Cylinder head Active EP2920447B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20126104A FI124604B (en) 2012-10-25 2012-10-25 CYLINDER HEAD
PCT/FI2013/050984 WO2014064330A1 (en) 2012-10-25 2013-10-14 Cylinder head

Publications (2)

Publication Number Publication Date
EP2920447A1 true EP2920447A1 (en) 2015-09-23
EP2920447B1 EP2920447B1 (en) 2016-12-07

Family

ID=49596325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13792410.6A Active EP2920447B1 (en) 2012-10-25 2013-10-14 Cylinder head

Country Status (4)

Country Link
EP (1) EP2920447B1 (en)
CN (1) CN104769266B (en)
FI (1) FI124604B (en)
WO (1) WO2014064330A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10385800B2 (en) * 2017-06-02 2019-08-20 Caterpillar Inc. Cylinder head assembly, cylinder head, and method
DE102017213167A1 (en) * 2017-07-31 2019-01-31 Robert Bosch Gmbh Fuel injector
DE102020006653A1 (en) * 2020-10-30 2022-05-05 Daimler Truck AG Injector sleeve for an injector, as well as injection device and internal combustion engine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498489A (en) * 1937-07-09 1939-01-09 Arthur Alexander Rubbra Fitting ignition plugs in liquid cooled internal combustion engines
US5345913A (en) * 1993-11-24 1994-09-13 Caterpillar Inc. Injector assembly
DE29803618U1 (en) * 1998-03-03 1998-06-10 Kuntschar, Walter, 34466 Wolfhagen Cylinder head or part of a cylinder head of an internal combustion engine with in particular four valves
CN1329652C (en) * 2003-02-28 2007-08-01 本田技研工业株式会社 Fuel injection system of engin
CN101044304A (en) * 2005-09-13 2007-09-26 通用汽车环球科技运作公司 Engine cooling method and apparatus
WO2012021709A1 (en) * 2010-08-11 2012-02-16 Cummins Intellectual Properties, Inc Engine with injector mounting and cooling arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014064330A1 *

Also Published As

Publication number Publication date
CN104769266A (en) 2015-07-08
CN104769266B (en) 2017-05-03
WO2014064330A1 (en) 2014-05-01
FI20126104L (en) 2014-04-26
FI124604B (en) 2014-10-31
EP2920447B1 (en) 2016-12-07

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