EP1028246A2 - Culasse pour un moteur à combustion interne - Google Patents

Culasse pour un moteur à combustion interne Download PDF

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Publication number
EP1028246A2
EP1028246A2 EP00102453A EP00102453A EP1028246A2 EP 1028246 A2 EP1028246 A2 EP 1028246A2 EP 00102453 A EP00102453 A EP 00102453A EP 00102453 A EP00102453 A EP 00102453A EP 1028246 A2 EP1028246 A2 EP 1028246A2
Authority
EP
European Patent Office
Prior art keywords
cylinder head
fastening bolt
water jacket
boss portion
fuel injector
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.)
Withdrawn
Application number
EP00102453A
Other languages
German (de)
English (en)
Other versions
EP1028246A3 (fr
Inventor
Yoshihiko Hamamura
Masahisa Nagata
Takanori Kawazu
Tomoaki Suzuki
Satoru Ohmoto
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP1028246A2 publication Critical patent/EP1028246A2/fr
Publication of EP1028246A3 publication Critical patent/EP1028246A3/fr
Withdrawn legal-status Critical Current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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a cylinder head of an internal combustion engine and, more particularly, to a construction of the cylinder head suitable for use in an in-cylinder direct injection type internal combustion engine.
  • each fuel injector is disposed in a housing hole extending through the upper portion of the cylinder head.
  • a conventional structure for fastening a fuel injector disposed in a housing hole to a cylinder head is described in, for example, Japanese Patent Application Laid-Open No. HEI 10-82355.
  • a clamp is placed so as to extend from an upper portion of the fuel injector to an upper portion of the cylinder head.
  • the clamp is pressed toward the upper portion of the cylinder head by a fastening bolt inserted through the clamp into the upper portion of the cylinder head from an upper face of the clamp.
  • Adoption of this fastening structure makes it possible to firmly fasten fuel injectors to an upper portion of a cylinder head even if the fuel injectors are designed to inject high-pressure fuel into the corresponding cylinders as in a direct injection type diesel engine.
  • a water jacket for circulating cooling water is divided into an upper portion and a lower portion in the cylinder head.
  • cooling water is conducted through the lower water jacket portion and the upper water jacket portion in that order. Therefore, a portion of the cylinder head adjacent to the combustion chambers, that is, a lower portion of the cylinder head where the heat load is high, can be cooled with precedence over other portions of the cylinder head, so that the cylinder head cooling efficiency improves.
  • both the injector fastening structure of a direct injection type internal combustion engine and the cooling structure of the cylinder head to which fuel injectors are fastened as described above are excellent structures, a combination of the two structures will have an unignorable problem as described below.
  • Fig. 4 is a side sectional view of a portion of a cylinder head around a fuel injector, wherein the cylinder head has upper and lower water jacket divisions and incorporates an injector fastening structure as described above.
  • upper and lower-stage water jackets 54a, 54b are formed between a bottom deck 51 that forms a bottom face of a cylinder head 50 and a top deck 52 that forms a top face of the cylinder head 50.
  • the two water jackets 54a, 54b are separated by a middle deck 53.
  • the cylinder head 50 has injector housing holes 55 that extend through the bottom deck 51 and the top deck 52.
  • a fuel injector 56 is disposed in each housing hole 55 in a manner as shown in Fig. 4.
  • Disposed on top of the cylinder head 50 is a clamp 60 that extends from a protrusion formed in an upper portion of the cylinder head 50 to an upper portion of the fuel injector 56.
  • a fastening bolt 61 is inserted through a central portion of the clamp 60. A distal end of the fastening bolt 61 is screwed into a fastening bolt boss 62 formed in the top deck 52 of the cylinder head 50.
  • the clamp 60 By tightening the fastening bolt 61, the clamp 60 is forced to press the fuel injector 56 from above with a cylinder head-contacting portion of the clamp 60 serving as a fulcrum. As a result, the fuel injector 56 is fastened and secured to the cylinder head 50 while being urged downward.
  • a cylinder head of an internal combustion engine comprising plurality of water jackets vertically divided by partitions, wherein a clamp extending over an upper portion of a fuel injector is fastened to an upper portion of the cylinder head by a fastening bolt.
  • the cylinder head is characterized in that a fastening bolt boss portion into which the fastening bolt is screwed extends through an uppermost water jacket of the plurality of vertically divided water jackets and interconnects an upper partition of the uppermost water jacket and a lower partition of the uppermost water jacket.
  • the upper partition and the lower partition of the uppermost water jacket are partially interconnected by the fastening bolt boss portion, so that those connected portions of the cylinder head have increased rigidities and, therefore, deformation of a portion near the fastening bolt boss portion can be suitably prevented. Therefore, even if the fuel injector is of a type that is designed to inject high-pressure fuel, such as a direct injection type or the like, the fuel injector can be firmly and stably fastened and secured to the cylinder head. Although the fastening bolt boss portion takes up a space in the uppermost water jacket, the fastening bolt boss portion does not block the passage of cooling water in the uppermost water jacket. Therefore, good cooling effect of the uppermost water jacket is maintained.
  • cooling water may be allowed to flow around the fastening bolt boss portion in the uppermost water jacket.
  • the fastening bolt boss portion may be formed downstream of the fuel injector in terms of a flowing direction of cooling water in the uppermost water jacket.
  • fastening bolt boss portion is positioned downstream of the fuel injector in terms of the flowing direction of cooling water, impediment of the flow of cooling water around the fuel injector caused by the fastening bolt boss portion is avoided.
  • the above-described construction also avoids an undesired event that cooling water warmed by the heat from the fastening bolt boss portion directly flows to the fuel injector. Therefore, it becomes possible to enhance the fastening of the fuel injector and increase the rigidity of the cylinder head while maintaining high injector cooling performance.
  • cylinder head of an internal combustion engine of the invention is embodied as a cylinder head of a direct injection type diesel engine will be described in detail below.
  • Fig. 1 shows a side sectional construction of a cylinder head according to the embodiment.
  • a cylinder head 10 has a bottom deck 11 that forms a bottom face of the cylinder head 10 and a top deck 12 that forms a top face of the cylinder head 10.
  • a water jacket 14, 15 for circulating cooling water is formed between the bottom deck 11 and the top deck 12.
  • a middle deck 13 is formed between the bottom deck 11 and the top deck 12.
  • the water jacket 14, 15 is formed by two layer portions divided vertically by the middle deck 13, that is, an upper-layer water jacket 15 and a lower-layer water jacket 14. Cooling water for cooling the cylinder head 10 is first conducted through the lower-layer water jacket 14, and then conducted into the upper-layer water jacket 15 in a returning manner. Thus, cooling water flows through the lower-layer water jacket 14 and the upper-layer water jacket 15 in opposite directions as indicated by arrows in Fig. 1.
  • the water jacket is vertically divided into two stages, and cooling water is conducted through the lower-layer water jacket 14 and the upper-layer water jacket 15 in that order.
  • cooling water is conducted through the lower-layer water jacket 14 and the upper-layer water jacket 15 in that order.
  • the cylinder head 10 has a housing boss portion 17 in which a housing hole 16 for housing a fuel injector is formed.
  • the housing boss portion 17 extends vertically through the lower-layer water jacket 14 and the upper-layer water jacket 15.
  • the cylinder head 10 has a structure for fastening and securing a fuel injector disposed in the housing hole 16 to the cylinder head 10.
  • Fig. 2 shows a fragmental side sectional view of the cylinder head 10, illustrating the structure for securing a fuel injector to the cylinder head 10 and its surrounding structure.
  • a clamp 22 is placed so as to extend from an upper portion of a fuel injector 20 housed in the housing boss portion 17 to a head portion of a cam cap bolt 25 securing a cam cap 24, as shown in Fig. 2.
  • the clamp 22 is secured to an upper portion of the cylinder head 10 by a fastening bolt 23 inserted through a central portion of the clamp 22.
  • the cylinder head 10 has a fastening bolt boss portion 19 having a bolt hole 18 into which the fastening bolt 23 is screwed.
  • the fastening bolt boss portion 19 extends through the upper-layer water jacket 15 to interconnect the top deck 12, which forms an upper partition of the upper-layer water jacket 15, and the middle deck 13, which forms a lower partition of the upper-layer water jacket 15.
  • the clamp 22 By screwing the fastening bolt 23 into the bolt hole 18 and tightening the fastening bolt 23, the clamp 22 is forced to press the fuel injector 20 from above while a portion of the clamp 22 contacting the head portion of the cam cap bolt 25 is serving as a fulcrum. As a result, the fuel injector 20 is fastened and secured in the housing hole 16 while being urged downward.
  • the fuel injector 20 is urged downward when fastened and secured as described. Therefore, the fastening bolt boss portion 19 coupled to the fastening bolt 23 is urged upward by the axial tension of the fastening bolt 23.
  • the top deck 12 and the middle deck 13 are partially interconnected by the fastening bolt boss portion 19 as described above, so that the rigidity of portions around the fastening bolt boss portion 19 of the cylinder head 10 is increased. Therefore, those portions of the cylinder head 10 of the embodiment are suitably prevented from being deformed by a force acting along an axis of the fastening bolt 23. As a result, it becomes possible to fasten and secure the fuel injector 20 more firmly and stably.
  • the rigidity of the entire cylinder head 10 can also be increased by the fastening bolt boss portion 19 connecting the top deck 12 and the middle deck 13.
  • the fastening bolt boss portion 19 takes up a space in the upper-layer water jacket 15, the fastening bolt boss portion 19 does not block the cooling water passage through the upper-layer water jacket 15. Therefore, good cooling effect of the upper-layer water jacket 15 is maintained.
  • the cooling structure of the cylinder head 10 of the embodiment and, more particularly, the cooling structure in the upper-layer water jacket 15 will be described below.
  • Fig. 3 is a plan sectional view of the cylinder head 10 taken on line III-III in Fig. 1, illustrating a horizontal sectional construction of the cylinder head 10 including that of the upper-layer water jacket 15.
  • the flow of cooling water in the upper-layer water jacket 15 is indicated by arrows.
  • the fastening bolt boss portion 19 of the cylinder head 10 of the embodiment is provided downstream of the housing boss portion 17 housing the fuel injector 20 in terms of the flowing direction of cooling water in the upper-layer water jacket 15. Therefore, the fastening bolt boss portion 19 does not impede the flow of cooling water near the housing boss portion 17, so that the provision of the fastening bolt boss portion 19 does not reduce the injector cooling efficiency.
  • fastening bolt boss portion 19 extends to interconnect the upper partition and the lower partition of the upper-layer water jacket 15, there is a possibility of slightly impeding the flow of cooling water in the upper-layer water jacket 15.
  • cooling water is allowed to flow substantially freely near the fastening bolt boss portion 19, so that the cooling effect on the surroundings of the fastening bolt boss portion 19 will not deteriorate.
  • the cylinder head 10 of the embodiment achieves various excellent advantages as stated below.
  • connection of the top deck 12 and the middle deck 13 by the fastening bolt boss portion 19 also increases the rigidity of the entire cylinder head 10.
  • fastening bolt boss portion 19 is provided downstream of the housing boss portion 17 in terms of the flowing direction of cooling water, adverse effect of the provision of the fastening bolt boss portion 19 on the cooling of the fuel injector 20 is avoided.
  • fastening bolt boss portion 19 extends to interconnect the upper partition and the lower partition of the upper-layer water jacket 15, there is a possibility of slightly impeding the flow of cooling water in the upper-layer water jacket 15.
  • cooling water is allowed to flow substantially freely near the fastening bolt boss portion 19, so that the cooling effect on the surroundings of the fastening bolt boss portion 19 will not deteriorate.
  • the invention is not limited to the foregoing embodiment, but may also be embodied in various other manners, for example, in manners modified from the foregoing embodiment as described below.
  • the fastening bolt boss portion 19 is provided downstream of the housing boss portion 17 in terms of the flowing direction of cooling water, at such a position that cooling water sufficiently flows around the housing boss portion 17.
  • the position of the fastening bolt boss portion 19 can be arbitrarily determined.
  • the invention is applied to the cylinder head having the upper and lower water jacket divisions 14, 15, the invention may also be applied to a cylinder head having more than two vertically divided water jacket portions, in a manner similar to the foregoing embodiment. If a fastening bolt boss portion is formed so as to extend through the uppermost water jacket portion and interconnect decks corresponding to the upper and lower partitions of the uppermost water jacket portion, it is possible to achieve advantages similar to those achieved by the foregoing embodiment.
  • the invention is applied to the direct injection type diesel engine cylinder head
  • the invention may also be applied to cylinder heads of other types of internal combustion engines, for example, a cylinder head of an in-cylinder direct fuel injection type gasoline engine, or the like, in a manner similar to the foregoing embodiment.
  • the invention is applicable to any cylinder head as long as the cylinder head has a construction in which a water jacket is formed by a plurality of water jacket portions vertically divided by partitions and a fuel injector is fastened and secured to an upper portion of the cylinder by using a clamp and a fastening bolt.
  • the invention can be effectively applied to a case where the fuel injector is of an in-cylinder direct fuel injection type.
  • the fuel injector may also be of a type other than the in-cylinder direct injection type.
  • a cylinder head 10 has two water jacket portions 14, 15 that are vertically divided by a middle deck 13.
  • a clamp 22 extends over an upper portion of a fuel injector 22.
  • the clamp 22 is fastened to the cylinder head 10 by a fastening bolt 23, so that the fuel injector 20 is fastened and secured to an upper portion of the cylinder head 10 while being urged downward.
  • a fastening bolt boss portion 19 into which the fastening bolt 23 is screwed extends through the upper water jacket 15 and interconnects the middle deck 13 and a top deck 12, which form a lower partition and an upper partition of the upper water jacket 15, respectively.
  • a cylinder head (10) has two water jacket portions (14, 15) that are vertically divided by a middle deck (13).
  • a clamp (22) extends over an upper portion of a fuel injector (22).
  • the clamp (22) is fastened to the cylinder head (10) by a fastening bolt (23), so that the fuel injector (20) is fastened and secured to an upper portion of the cylinder head (10) while being urged downward.
  • a fastening bolt boss portion (19) into which the fastening bolt (23) is screwed extends through the upper water jacket (15) and interconnects the middle deck (13) and a top deck (12), which form a lower partition and an upper partition of the upper water jacket (15), respectively.

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  • 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)
  • Fuel-Injection Apparatus (AREA)
EP00102453A 1999-02-09 2000-02-04 Culasse pour un moteur à combustion interne Withdrawn EP1028246A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3134599 1999-02-09
JP11031345A JP2000230457A (ja) 1999-02-09 1999-02-09 内燃機関のシリンダヘッド

Publications (2)

Publication Number Publication Date
EP1028246A2 true EP1028246A2 (fr) 2000-08-16
EP1028246A3 EP1028246A3 (fr) 2001-07-04

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EP00102453A Withdrawn EP1028246A3 (fr) 1999-02-09 2000-02-04 Culasse pour un moteur à combustion interne

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EP (1) EP1028246A3 (fr)
JP (1) JP2000230457A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004001214A1 (fr) * 2002-06-21 2003-12-31 Fev Motorentechnik Gmbh Culasse refroidie pour moteur a combustion interne a pistons
WO2006072333A1 (fr) * 2004-12-24 2006-07-13 Fev Motorentechnik Gmbh Culasse renforcee
CN103485921A (zh) * 2013-09-24 2014-01-01 中国北方发动机研究所(天津) 一种用于高强化柴油机的均匀冷却双层水腔气缸盖
CN110439705A (zh) * 2019-07-02 2019-11-12 广西玉柴机器股份有限公司 一种缸盖冷却结构
CN111765016A (zh) * 2020-07-10 2020-10-13 王飞飞 一种v型气缸盖毛坯

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100828795B1 (ko) * 2006-12-13 2008-05-09 현대자동차주식회사 실린더 헤드의 미들덱 강성 보강구조

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61175217A (ja) 1985-01-29 1986-08-06 Mazda Motor Corp シリンダヘツドの冷却構造

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234780A (en) * 1938-12-16 1941-03-11 Gen Motors Corp Cylinder head construction
GB828014A (en) * 1957-05-20 1960-02-10 Fodens Ltd Improvements in the cooling system of the cylinder head of a diesel engine
US3405696A (en) * 1966-06-01 1968-10-15 Gen Motors Corp Individual cylinder head for internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61175217A (ja) 1985-01-29 1986-08-06 Mazda Motor Corp シリンダヘツドの冷却構造

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004001214A1 (fr) * 2002-06-21 2003-12-31 Fev Motorentechnik Gmbh Culasse refroidie pour moteur a combustion interne a pistons
US6973897B2 (en) 2002-06-21 2005-12-13 Fev Motorentechnik Gmbh Cooled cylinder head for a reciprocating engine
CN100340759C (zh) * 2002-06-21 2007-10-03 Fev电机技术有限公司 用于活塞式内燃机的受冷却的气缸盖
WO2006072333A1 (fr) * 2004-12-24 2006-07-13 Fev Motorentechnik Gmbh Culasse renforcee
US8001935B2 (en) 2004-12-24 2011-08-23 Fev Motorentechnik Gmbh Cylinder head with reinforcement
CN103485921A (zh) * 2013-09-24 2014-01-01 中国北方发动机研究所(天津) 一种用于高强化柴油机的均匀冷却双层水腔气缸盖
CN110439705A (zh) * 2019-07-02 2019-11-12 广西玉柴机器股份有限公司 一种缸盖冷却结构
CN110439705B (zh) * 2019-07-02 2024-05-10 广西玉柴机器股份有限公司 一种缸盖冷却结构
CN111765016A (zh) * 2020-07-10 2020-10-13 王飞飞 一种v型气缸盖毛坯

Also Published As

Publication number Publication date
EP1028246A3 (fr) 2001-07-04
JP2000230457A (ja) 2000-08-22

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