EP3214295A1 - Culasse et moteur à combustion interne équipé de celui-ci - Google Patents

Culasse et moteur à combustion interne équipé de celui-ci Download PDF

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Publication number
EP3214295A1
EP3214295A1 EP15855005.3A EP15855005A EP3214295A1 EP 3214295 A1 EP3214295 A1 EP 3214295A1 EP 15855005 A EP15855005 A EP 15855005A EP 3214295 A1 EP3214295 A1 EP 3214295A1
Authority
EP
European Patent Office
Prior art keywords
surface portion
bolt
sealing surface
combustion
cylinder head
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Withdrawn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
EP15855005.3A
Other languages
German (de)
English (en)
Other versions
EP3214295A4 (fr
Inventor
Daichi Abe
Takashi Satake
Koichi Tokura
Nobuo Iwamuro
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.)
Aichi Machine Industry Co Ltd
Original Assignee
Aichi Machine Industry Co Ltd
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 Aichi Machine Industry Co Ltd filed Critical Aichi Machine Industry Co Ltd
Publication of EP3214295A1 publication Critical patent/EP3214295A1/fr
Publication of EP3214295A4 publication Critical patent/EP3214295A4/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Withdrawn legal-status Critical Current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
    • 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
    • F02F11/00—Arrangements of sealings in combustion engines 
    • F02F11/002—Arrangements of sealings in combustion engines  involving 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0021—Construction
    • F02F2007/0041—Fixing Bolts
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • F02F2007/0063—Head bolts; Arrangements of cylinder head bolts

Definitions

  • This type of cylinder head that has been proposed so far includes an upper deck defining a valve mechanism chamber, a lower deck defining a combustion chamber, a side wall formed in a rectangular frame shape to surround the upper and lower decks, and a slanted wall that connects the side wall with a portion of the lower deck corresponding to a center of the combustion chamber in a slanting manner.
  • the cylinder head is fastened to a cylinder block with head fastening bolts inserted from the upper deck side (see, e.g., Patent Literature 1).
  • Patent Literature 1 Japanese Examined Utility Model Publication H3-13547 Y
  • the cylinder head described above can effectively decrease deformation of the center part of the combustion chamber.
  • deformation of a mating surface of the combustion chamber between the cylinder head and the cylinder block around the combustion chamber that is, deformation of a combustion-chamber sealing surface portion has not been considered.
  • Deformation of the combustion-chamber sealing surface portion causes deterioration of the sealing characteristic of the combustion chamber.
  • the sealing characteristic of the combustion chamber is typically provided by bolt fastening force of the head fastening bolts disposed on the combustion-chamber sealing surface portion around the combustion chamber. Such bolt fastening force, however, does not effectively act on the entire region of the combustion-chamber sealing surface portion, leaving room for improvement of the sealing characteristic.
  • the present invention has been made in view of the above, and it is an object of the present invention to provide a technique to achieve improved sealing characteristic of a combustion chamber.
  • a cylinder head and an internal combustion engine equipped with the cylinder head adopt the following means to achieve the above object.
  • the inter-bolt-hole sealing surface portion on which the bolt fastening force hardly acts is connected to the side wall via the slanted wall.
  • This structure allows the side wall to receive the explosion load acting on the inter-bolt-hole sealing surface portion via the slanted wall.
  • the deformation of the inter-bolt-hole sealing surface portion can be effectively decreased.
  • an improved sealing characteristic of the combustion chamber can be achieved.
  • the slanted wall connects the side wall with at least the portion of the edge portion of the inter-bolt-hole sealing surface portion located at the farthest distance away from the centers of the first and second bolt insert holes. That is, the slanted wall connects the side wall with the portion of the inter-bolt-hole sealing surface portion on which the bolt fastening force is most unlikely to act and which, therefore, is easily deformed. Thus, the deformation of the inter-bolt-hole sealing surface portion can be decreased effectively.
  • the cylinder head includes an imaginary connecting line that connects between centers of the first and second bolt insert holes.
  • the edge portion is formed substantially in parallel with the imaginary connecting line.
  • the explosion load acting on the inter-bolt-hole sealing surface portion can be transmitted easily and uniformly to the slanted wall.
  • the deformation of the inter-bolt-hole sealing surface portion can be effectively decreased.
  • the slanted wall of the cylinder head connects the entire region of the edge portion with the side wall.
  • the entire region of the edge portion is connected to the side wall via the slanted wall, thus decreasing the deformation of the inter-bolt-hole sealing surface portion more effectively.
  • the lower deck of the cylinder head includes first and second boss portions in which first and second bolt insert holes are formed respectively.
  • the slanted wall is connected to the first and second boss portions.
  • the slanted wall is connected to the first and second boss portions, allowing the bolt fastening force to act on the slanted wall.
  • the deformation of the inter-bolt-hole sealing surface portion can be decreased more effectively by both the slanted wall and the bolt fastening force.
  • the side wall of the cylinder head includes an attaching surface portion to which peripheral parts necessary for operating the internal combustion engine are attached.
  • the slanted wall is connected to the lower end portion of the attaching surface portion of the side wall.
  • peripheral parts typically correspond to a water outlet capable of distributing cooling water to a radiator or a heater to cool the internal combustion engine including the cylinder head, and also preferably include auxiliary components, such as an alternator or a starter motor.
  • the peripheral parts are attached in a cantilevered manner to the attaching surface portion, causing bending force which is generated by self-weight or vibration of the peripheral parts to act on the lower end portion of the attaching surface portion.
  • the lower end portion of the attaching surface portion is connected to the inter-bolt-hole sealing surface portion via the slanted wall, thus enabling the inter-bolt-hole sealing surface portion to receive the bending force via the slanted wall. This improves the rigidity of the attaching surface portion, and decreases the deformation of the attaching surface portion effectively.
  • an internal combustion engine includes the cylinder head according to any one of the modes described above, a cylinder block including cylinder bores, pistons configured to slide in the cylinder bores, and a crankshaft connected to the pistons.
  • the internal combustion engine generates reciprocating motion of the pistons by combustion pressure generated in the combustion chamber, and translates the reciprocating motion of the pistons to rotary motion of a crankshaft to provide output power.
  • the present invention includes the cylinder head according to any one of the modes described above, so that an effect similar to the effect achieved by the cylinder head of the present invention can be achieved.
  • the effect of effectively decreasing the deformation of the inter-bolt-hole sealing surface portion and improving the sealing characteristic of the combustion chamber can be achieved.
  • the present invention can achieve improved sealing characteristic of the combustion chamber.
  • An internal combustion engine 1 on which a cylinder head 20 according to an embodiment of the present invention is mounted includes, as illustrated in Fig. 1 , the cylinder head 20 according to the embodiment of the present invention, a rocker cover 2 attached to the top of the cylinder head 20, a water outlet 4 attached to the side of the cylinder head 20, a cylinder block 6 attached to the bottom of the cylinder head 20, an upper oil pan 8 attached to the bottom of the cylinder block 6, and a lower oil pan 10 attached to the bottom of the upper oil pan 8.
  • a valve mechanism chamber VMC for accommodating and disposing intake and exhaust camshafts, intake and exhaust valves, valve lifters, and the like is formed at an upper portion of the cylinder head 20 above the upper deck 22.
  • the valve mechanism chamber VMC is an example constituent component of the embodiment corresponding to a "valve mechanism chamber" of the present invention.
  • the edge portion 30a' is located, as illustrated in Fig. 4 , on the side opposite to the combustion-chamber constituting recesses 24a across an imaginary connecting line VCL that connects between the centers of the pair of endmost-row bolt insert holes 132.
  • the edge portion 30a' is formed in a circular-arc shape to be part of a circle around the center of the combustion-chamber constituting recess 24a.
  • the cylinder head 20 includes a plurality of bolt boss portions 34 are formed, as illustrated in Fig. 4 .
  • Bolt insert holes 32 are formed respectively in the bolt boss portions 34 and the head fastening bolts (not illustrated) described above are inserted respectively through the bolt boss portions 34.
  • the bolt insert holes 32 pierces between the upper deck 22 and the lower deck 24.
  • the bolt boss portions 34 are also disposed on the outer periphery of the combustion-chamber sealing surface portion 29a, and connected integrally to the combustion-chamber sealing surface portion 29a.
  • Two pairs of bolt insert holes 32 are disposed respectively on the both sides across each combustion chamber CC in a direction in which the combustion chambers are arranged, and a total of four bolt insert holes 32 are disposed at substantially equal intervals (90-degree intervals) along a circumferential direction of the combustion chamber CC.
  • a water jacket WJ for the cylinder head is formed between the upper deck 22 and the lower deck 24, in which cooling water for cooling the cylinder head 20 particularly around the combustion chambers CC flows.
  • the water jacket WJ for the cylinder head has a water jacket outlet 36.
  • the slanted wall portion 38 is also connected to the pair of bolt boss portions 34 in which a pair of endmost-row bolt insert holes 132 are formed respectively, as illustrated in Figs. 4 , 6 , and 7 .
  • the slanted wall portion 38 is connected to the combustion- chamber sealing surface portion 29a in the region from the one bolt boss portion 34, in which the one endmost-row bolt insert holes 132 is formed, to the other bolt-boss portion 34, in which the other endmost-row bolt insert hole 132 is formed, via the inter-bolt-hole sealing surface portion 30a.
  • the slanted wall portion 38 connecting the entire region of the inter-bolt-hole sealing surface portion 30a with the lower end portion of the attaching surface portion 14 of the side wall 26a is an example structure corresponding to a "slanted wall connecting the entire region of an inter-bolt-hole sealing surface portion with the side wall" in the present invention.
  • the slanted wall portion 38 being connected to the pair of bolt boss portions 34 is an example structure corresponding to a "slanted wall being connected to first and second boss portions" in the present invention.
  • the slanted wall portion 38 is an example constituent component corresponding to a "slanted wall” of the present invention.
  • the pair of endmost-row bolt insert holes 132 is an example constituent component corresponding to a "first bolt insert hole” and a "second bolt insert hole” of the present invention.
  • the cylinder head 20 receives force (hereinafter referred to as explosion load) by the combustion explosion in a direction away from the cylinder block 6.
  • the cylinder head 20, however, is fastened to the cylinder block 6 with fastening bolts, so that the explosion load actually causes deformation of the sealing surface portion 29, or especially the combustion-chamber sealing surface portion 29a, which is the surface attached to the cylinder block 6.
  • axial force of the fastening bolts effectively acts on an area in the vicinity of the bolt insert holes 32 through which the fastening bolts are inserted respectively.
  • the explosion load acting on the combustion-chamber sealing surface portion 29a can be effectively covered by the axial force of the fastening bolts, decreasing the deformation of the sealing surface portion 29a of the combustion chamber.
  • the inter-bolt-hole sealing surface portion 30a extending between the pair of endmost-row bolt insert holes 132 disposed on one end side (side wall 26a side, or upper side of Fig. 4 ) in the combustion-chambers arranging direction.
  • vibration is generated by reciprocating motion of the pistons P during the operation of the internal combustion engine 1, and the vibration also acts on the water outlet 4.
  • the water outlet 4 is attached to the attaching surface portion 14 of the cylinder head 20 in the cantilevered manner, so that a bending force due to the vibration acts on the attaching surface portion 14.
  • the attaching surface portion 14 In addition to the bending force due to the vibration, the attaching surface portion 14 also receives a bending force generated by self-weight of the water outlet 4. In the present embodiment, however, the slanted wall portion 38 connects the lower end portion of the attaching surface portion 14 with the sealing surface portion 29a of the combustion chamber. Thus, the tension force or compression force caused by the bending force acting on the lower end portion of the attaching surface portion 14 can be received by the sealing surface portion 29a of the combustion chamber via the slanted wall portion 38. This improves the rigidity of the attaching surface portion 14, and decreases the deformation of the attaching surface portion 14 effectively.
  • the slanted wall portion 38 connects the combustion-chamber sealing surface portion 29a with the side wall 26a over the entire region of the edge portion 30a' of the inter-bolt-hole sealing surface portion 30a.
  • This structure may be changed.
  • the slanted wall portion 38 may connect the combustion-chamber sealing surface portion 29a with the side wall 26a in at least a part of the edge portion 30a' of the inter-bolt-hole sealing surface portion 30a.
  • the slanted wall portion 38 preferably connects the combustion-chamber sealing surface portion 29a with the side wall 26a at a portion FP located at the farthest distance away from the centers of the pair of the endmost-row bolt insert holes 132 in the edge portion 30a' of the inter-bolt-hole sealing surface portion 30a.
  • the slanted wall portion 38 can be minimized, while the deformation of the portion at which deformation easily occurs, because the axial force of the fastening bolts is most unlikely be exerted, can be effectively decreased in the inter-bolt-hole sealing surface portion 30a.
  • the portion FP located at the farthest distance away from the centers of the pair of the endmost-row bolt insert holes 132 in the edge portion 30a' of the inter-bolt-hole sealing surface portion 30a is an example constituent component corresponding to a "portion located at the farthest distance away from the centers of at least first and second bolt insert holes in an edge portion" in the present invention.
  • the slanted wall portion 38 connects the combustion-chamber sealing surface portion 29a with the side wall 26a only in the inter-bolt-hole sealing surface portion 30a extending between the pair of endmost-row bolt insert holes 132 of the sealing surface portion 29a of the combustion chamber.
  • the configuration of the slanted wall portion 38 is not limited to this.
  • the slanted wall portion may also be provided between other bolt insert holes 32 disposed in the combustion-chamber sealing surface portion 29a.
  • the slanted wall portion may connect the other inter-bolt-hole sealing surface portion of the combustion-chamber sealing surface portion 29a, which extends between other bolt insert holes 32, with the respective side wall 26 corresponding to the other inter-bolt-hole sealing surface portion.
  • the combustion-chamber sealing surface portion 29a is connected to the lower end portion of the attaching surface portion 14 for attaching the water outlet 4 to the cylinder head 20 via the slanted wall portion 38.
  • the sealing surface portion 29a of the combustion chamber may be connected to the center portion or the upper end portion of the attaching surface portion 14.
  • the edge portion 30a' is formed in a circular arc shape to form a part of a circle centered at the center of the combustion-chamber constituting recess 24a.
  • the configuration of the edge portion 30a' may be changed.
  • an edge portion 130a' may be formed substantially in parallel with the imaginary connecting line VCL.
  • This structure facilitates uniform transfer of the explosion load, which acts on the inter-bolt-hole sealing surface portion 30a, to the slanted wall portion 38, thus decreasing the deformation of the inter-bolt-hole sealing surface portion more effectively.
  • the present embodiment is an example mode for carrying out the present invention. Therefore, the present invention is not limited to the structure of the present embodiment.

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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)
EP15855005.3A 2014-10-27 2015-03-30 Culasse et moteur à combustion interne équipé de celui-ci Withdrawn EP3214295A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014218256 2014-10-27
PCT/JP2015/059914 WO2016067653A1 (fr) 2014-10-27 2015-03-30 Culasse et moteur à combustion interne équipé de celui-ci

Publications (2)

Publication Number Publication Date
EP3214295A1 true EP3214295A1 (fr) 2017-09-06
EP3214295A4 EP3214295A4 (fr) 2018-09-19

Family

ID=55857012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15855005.3A Withdrawn EP3214295A4 (fr) 2014-10-27 2015-03-30 Culasse et moteur à combustion interne équipé de celui-ci

Country Status (5)

Country Link
EP (1) EP3214295A4 (fr)
JP (1) JPWO2016067653A1 (fr)
CN (1) CN107076049B (fr)
MX (1) MX2017005211A (fr)
WO (1) WO2016067653A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR491360A (fr) * 1917-04-18 1919-05-31 Giustino Cattaneo Innovations dans les cylindres pour moteurs à explosion
DE348632C (de) * 1920-04-24 1922-02-13 Reinhard Hildebrand Zylinderkopf fuer Verbrennungskraftmaschinen
JPS5996341U (ja) * 1982-12-20 1984-06-29 マツダ株式会社 エンジンのシリンダヘツド構造
JPS59203851A (ja) * 1983-05-02 1984-11-19 Honda Motor Co Ltd 内燃機関のシリンダヘツド
JPS60113050A (ja) * 1983-11-25 1985-06-19 Mazda Motor Corp エンジンのシリンダヘツド構造
JPH04276159A (ja) * 1991-02-28 1992-10-01 Suzuki Motor Corp エンジンのシリンダヘッド構造
JPH05223004A (ja) * 1992-02-12 1993-08-31 Honda Motor Co Ltd エンジンのエンジンブロック
JP3498446B2 (ja) * 1995-10-26 2004-02-16 日産自動車株式会社 火花点火機関用シリンダヘッド
JP2008045417A (ja) * 2006-08-10 2008-02-28 Aichi Mach Ind Co Ltd シリンダヘッドおよびこれを備える内燃機関
JP5517576B2 (ja) * 2009-11-25 2014-06-11 ダイハツ工業株式会社 シリンダブロック、シリンダヘッド間の締結構造
US20110277708A1 (en) * 2010-05-17 2011-11-17 Gm Global Technology Operations, Inc. Cylinder Head for Internal Combustion Engine

Also Published As

Publication number Publication date
EP3214295A4 (fr) 2018-09-19
CN107076049A (zh) 2017-08-18
CN107076049B (zh) 2019-06-04
MX2017005211A (es) 2017-07-26
JPWO2016067653A1 (ja) 2017-08-10
WO2016067653A1 (fr) 2016-05-06

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