EP1826389A1 - Verbrennungsmotor - Google Patents

Verbrennungsmotor Download PDF

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Publication number
EP1826389A1
EP1826389A1 EP07101110A EP07101110A EP1826389A1 EP 1826389 A1 EP1826389 A1 EP 1826389A1 EP 07101110 A EP07101110 A EP 07101110A EP 07101110 A EP07101110 A EP 07101110A EP 1826389 A1 EP1826389 A1 EP 1826389A1
Authority
EP
European Patent Office
Prior art keywords
opening
crankcase
bolt hole
bolt
combustion engine
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
EP07101110A
Other languages
English (en)
French (fr)
Other versions
EP1826389B1 (de
Inventor
Masaki Yoneyama
Naoki Kono
Kohji Minami
Fumiaki Okubo
Hiroshi Kuribara
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor 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
Priority claimed from JP2006052761A external-priority patent/JP4640826B2/ja
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP1826389A1 publication Critical patent/EP1826389A1/de
Application granted granted Critical
Publication of EP1826389B1 publication Critical patent/EP1826389B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0053—Crankshaft bearings fitted in the crankcase
    • 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
    • F02F7/0082—Mounting of engine casings
    • 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

  • the present invention relates to a crankcase of an internal combustion engine, particularly relates to fastening structure of a part supporting a crankshaft in the crankcase.
  • crankcase in the related art is equivalent to an upper crankcase in the invention and the crank cap in the related art is equivalent to a lower crankcase in the invention.
  • the invention is made to address the problem, the invention disclosed in Claim 1 is based upon an internal combustion engine provided with: a crankcase vertically partitioned; a crankshaft rotatably journalled to the crankcase; a fastening bolt for fastening upper and lower crankcases in a circumference of the crankcase; and a bolt hole which is formed in the crankcase and into which the fastening bolt is inserted and tightened, and is characterized in that an opening is formed at an upper end of the bolt hole in the upper crankcase, the end of the bolt hole communicates with the opening, and the end of the fastening bolt is protruded into the opening when the bolt is fastened.
  • the invention disclosed in Claim 2 is based upon the internal combustion engine disclosed in Claim 1, and is characterized in that a circumference of the end of the bolt hole is protruded into the opening of the crankcase.
  • the invention disclosed in Claim 3 is based upon the internal combustion engine disclosed in Claim 2, and is characterized in that an inside diameter of the bolt hole end circumference protruded part is made longer than a diameter of the bolt hole from the end of the part to the inside apart by predetermined distance, and no screw is formed.
  • the invention disclosed in Claim 4 is based upon the internal combustion engine disclosed in Claims 1 to 3, and is characterized in that the opening is formed in an arbitrary anomalous shape, and a V-type rib is formed at the edge of the opening with the end of the bolt hole in the center.
  • the invention disclosed in Claim 5 is based upon the internal combustion engine disclosed in Claims 1 to 4, and is characterized in that a cylinder block in which plural cylinders are arranged in parallel is arranged on the open upside of the crankcase, and the opening is formed in a crank journal wall partitioning space corresponding to the cylinder of the crankcase.
  • the invention disclosed in Claim 6 is based upon the internal combustion engine disclosed in Claim 1, and is characterized in that the opening is formed in a circle, and the opening is formed so that its diameter is equivalent to the double or less of a diameter of the bolt hole.
  • the protrusion of the bolt into the opening can be inhibited. Besides, the exposure of the edge of the termination of the bolt hole caused in working a screw can be prevented.
  • the opening can be formed in an arbitrary anomalous shape different from a normal shape such as a circle, hereby, the shape can be varied in accordance with the necessity of securing the rigidity of the crankcase, and the opening in the crankcase can be expanded at the maximum.
  • the V-type rib is arranged at the peripheral edge of the opening, tensile stress applied to the periphery of the opening from the fastened part can be dispersed in the whole crankcase, and the lightening and securing the rigidity can be achieved.
  • crank journal wall functions for pressure relief between cylinders, pumping loss can be reduced and friction can be reduced.
  • tensile stress applied to the circular opening can be uniformly received in the circumference of a circular part when the opening is formed in a circle and the inside diameter of the opening is set to the double or less, the reduction of the rigidity of the crankcase is possibly inhibited and the dispersion of the tensile stress is enabled.
  • Fig. 1 is a partial longitudinal section showing an internal combustion engine 1 equivalent to one embodiment of the invention.
  • the internal combustion engine is an in-line four-cylinder internal combustion engine and Fig. 1 shows a section of a bulkhead between cylinders.
  • a crankcase 2 is vertically partitioned in two and is configured by an upper crankcase 2A and a lower crankcase 2B.
  • a cylinder block 3, a cylinder head 4 and a cylinder head cover are connected to the upside of the upper crankcase 2A.
  • the cylinder head cover is not shown.
  • An oil pan 6 is connected to the bottom of the lower crankcase 2B.
  • a crankshaft supporting part 10 is formed on joined faces of the upper crankcase 2A and the lower crankcase 2B and a crankshaft 11 is rotatably supported in this part.
  • a main gallery 12 and a lubricating oil passage 13 are provided under the crankshaft supporting part 10.
  • Transmission shaft supporting structure 14 is provided to the rear of the crankcase 2.
  • Camshaft supporting part 15 for driving an intake/exhaust valve is provided to an upper part of the cylinder head 4.
  • a water jacket 17 is provided to inner circumferences of the cylinder block 3 and the cylinder head 4 and the cylinder bulkhead 16.
  • An upper crank journal wall 20A and a lower crank journal wall 20B are provided to the upper and lower crankcases 2A, 2B in parts corresponding to a crank journal corresponding part to the cylinder bulkhead 16.
  • a journal bearing 21 is provided to the crankshaft supporting part 10 provided to the crank journal walls 20A, 20B.
  • the upper crankcase 2A and the lower crankcase 2B are fastened by plural fastening bolts.
  • the front and the rear of the crankshaft supporting part 10 are fastened by a front fastening bolt 22 and a rear fastening bolt 23 respectively particularly long.
  • a large anomalous outline opening 24 that communicates space corresponding to adjacent cylinders is provided to the crank journal wall 20A of the upper crankcase 2A.
  • the reason why the opening has the anomalous outline is that it does not have a circular outline formed by normal machining but is formed in an arbitrary shape if necessary.
  • a small circular opening 25 having a circular section and piercing the plural crank journal walls 20A is formed at the back of the large anomalous outline opening 24 of the crank journal wall 20A of the upper crankcase 2A in parallel with the crankshaft 11 by drilling and others.
  • Fig. 2 is a top view showing a main part of the upper crankcase 2A.
  • a cylinder block connected face 28 is shown.
  • this internal combustion engine is the four-cylinder internal combustion engine and the crank journal walls 20A partitioning space corresponding to a cylinder 29 are provided in the upper crankcase 2A.
  • the large anomalous outline opening 24 provided to the crank journal wall 20A, a front bolt hole 30 into which the front fastening bolt 22 is fitted and a rib 34 provided to an edge of the large anomalous outline opening 24 are seen.
  • Fig. 3 is an enlarged longitudinal section showing a main part of the upper crankcase 2A and shows the circumference of bolt holes 30, 31 in front of and at the back of the crankshaft supporting part 10 provided to the upper crank journal wall 20A.
  • the front bolt hole 30 is a bolt hole into which the front fastening bolt 22 is screwed and the rear bolt hole 31 is a bolt hole into which the rear fastening bolt 23 is screwed.
  • An upper end of the front bolt hole 30 communicates with the large anomalous outline opening 24, the circumference of the upper end of the front bolt hole 30 is protruded into the large anomalous outline opening 24, and a bolt hole end circumference protruded part 32 is formed.
  • an extended diameter part 33 the inside diameter of which is slightly extended, compared with the diameter of the bolt hole is formed from the end to the inside apart by predetermined distance, and no screw is formed in the extended diameter part 33.
  • a V-type rib 34 is formed at the edge of the large anomalous outline opening 24 with the upper end of the front bolt hole 30 in the center. The end of the front fastening bolt 22 fitted into the front bolt hole 30 is protruded into the large anomalous outline opening 24 as shown in Fig. 1.
  • the small circular opening 25 having the circular section is formed in the crank journal wall 20A of the upper crankcase 2A by drilling and others and the end of the rear bolt hole 31 communicates with the small circular opening 25.
  • the end of the rear fastening bolt 23 screwed into the rear bolt hole 31 is protruded into the small circular opening 25 as shown in Fig. 1.
  • the inside diameter of the small circular opening has length equivalent to 1.3 times of the inside diameter of the bolt hole, however, it is desirable that the inside diameter has double or shorter length at the maximum. This reason is that an upper limit of the dimension of the inside diameter is set to avoid the deterioration of the rigidity of the crankcase.
  • Figs. 4 are explanatory drawings for explaining the effect of the bolt hole end circumference protruded part 32 in the invention.
  • Fig. 4(a) shows that part in the invention, the protruded part 32 is formed in the circumference of the end of the bolt hole 30 in the crank journal wall 20A, and the end of the fastening bolt 22 is protruded into the opening 24.
  • Fig. 4(b) shows the above-mentioned part in related art of the invention, no protruded part is formed in a circumference of the end of a bolt hole 030 in a crank journal wall 020A, and the end of a fastening bolt 022 remains in the bolt hole 030. As shown in Fig.

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)
EP20070101110 2006-02-28 2007-01-24 Verbrennungsmotor Expired - Fee Related EP1826389B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006052761A JP4640826B2 (ja) 2006-02-28 2006-02-28 内燃機関のピストン冷却装置
JP2006287091 2006-10-23

Publications (2)

Publication Number Publication Date
EP1826389A1 true EP1826389A1 (de) 2007-08-29
EP1826389B1 EP1826389B1 (de) 2010-02-24

Family

ID=37907175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070101110 Expired - Fee Related EP1826389B1 (de) 2006-02-28 2007-01-24 Verbrennungsmotor

Country Status (3)

Country Link
EP (1) EP1826389B1 (de)
DE (1) DE602007004888D1 (de)
ES (1) ES2339884T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101907036A (zh) * 2009-06-02 2010-12-08 本田技研工业株式会社 旋转轴支撑箱构造

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19645691A1 (de) * 1996-11-06 1998-05-14 Bayerische Motoren Werke Ag Kurbelwellenlager für Kolbenmaschinen, insbesondere V-Motoren
DE19756390A1 (de) * 1997-12-18 1999-06-24 Mahle Gmbh Kurbelgehäuse aus insbesondere Leichtmetall
US5931135A (en) * 1996-10-18 1999-08-03 Toyota Jidosha Kabushiki Kaisha Cylinder block of internal combustion engine
DE19949929C1 (de) * 1999-10-16 2001-01-11 Daimler Chrysler Ag Kurbelwellenlager
DE10102764A1 (de) * 2001-01-23 2002-07-25 Volkswagen Ag Hubkolben-Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5931135A (en) * 1996-10-18 1999-08-03 Toyota Jidosha Kabushiki Kaisha Cylinder block of internal combustion engine
DE19645691A1 (de) * 1996-11-06 1998-05-14 Bayerische Motoren Werke Ag Kurbelwellenlager für Kolbenmaschinen, insbesondere V-Motoren
DE19756390A1 (de) * 1997-12-18 1999-06-24 Mahle Gmbh Kurbelgehäuse aus insbesondere Leichtmetall
DE19949929C1 (de) * 1999-10-16 2001-01-11 Daimler Chrysler Ag Kurbelwellenlager
DE10102764A1 (de) * 2001-01-23 2002-07-25 Volkswagen Ag Hubkolben-Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101907036A (zh) * 2009-06-02 2010-12-08 本田技研工业株式会社 旋转轴支撑箱构造
CN101907036B (zh) * 2009-06-02 2012-12-12 本田技研工业株式会社 旋转轴支撑箱构造

Also Published As

Publication number Publication date
ES2339884T3 (es) 2010-05-26
DE602007004888D1 (de) 2010-04-08
EP1826389B1 (de) 2010-02-24

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