EP1911956A2 - Unterkurbelgehäuse einer Brennkraftmaschine - Google Patents

Unterkurbelgehäuse einer Brennkraftmaschine Download PDF

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Publication number
EP1911956A2
EP1911956A2 EP08001889A EP08001889A EP1911956A2 EP 1911956 A2 EP1911956 A2 EP 1911956A2 EP 08001889 A EP08001889 A EP 08001889A EP 08001889 A EP08001889 A EP 08001889A EP 1911956 A2 EP1911956 A2 EP 1911956A2
Authority
EP
European Patent Office
Prior art keywords
cross member
supporting
crankshaft
member body
side members
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Withdrawn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
EP08001889A
Other languages
English (en)
French (fr)
Other versions
EP1911956A3 (de
Inventor
Azmi Osman
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.)
Petroliam Nasional Bhd Petronas
Original Assignee
Petroliam Nasional Bhd Petronas
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 Petroliam Nasional Bhd Petronas filed Critical Petroliam Nasional Bhd Petronas
Publication of EP1911956A2 publication Critical patent/EP1911956A2/de
Publication of EP1911956A3 publication Critical patent/EP1911956A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • 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
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0436—Iron
    • F05C2201/0439—Cast iron

Definitions

  • This invention relates to a lower casing of an engine crankcase.
  • it is formed through aluminum casting by using a supporting member for supporting a crankshaft as an insert member.
  • a conventional lower casing of the engine crankcase is disclosed in JP-A-H10-331715 .
  • the lower casing of the crankcase disclosed in the above publication comprises a pair of left and right aluminum side members extending along a crankshaft and disposed on the left and right thereof, and a laterally extending cross member provided between the side members and formed with a semicircular supporting recess on its top surface for the crankshaft to be fitted in and supported at the lower half of its journal.
  • the cross member comprises an aluminum cross member body provided between the side members, and a cast-iron supporting member formed with the supporting recess on its top surface and built in the cross member body while leaving the top surface, and the side members and the cross member body are formed together through aluminum casting by using the supporting member as an insert member. Since the supporting member is made of cast iron as described, its strength of supporting the crankshaft is reliably secured.
  • Methods of casting the lower casing of the crankcase described above include the following.
  • a mold for the lower casing is formed with the supporting member as an insert member disposed in position.
  • liquid aluminum is poured into an inner mold of the mold for one of the side members, that is, one of inner molds for the side members.
  • the liquid aluminum flows along inside of an inner mold for the cross member body longitudinally from the inner mold for one of the side members toward the inner mold for the other side member. Filling the inside of the mold with the liquid aluminum in such a way as described forms the lower casing, with the supporting member built in the cross member body.
  • a longitudinal midsection of the cross member body has a top surface formed with a recess corresponding to the supporting recess formed on the top surface of the supporting member.
  • the midsection of the cross member body therefore, tends to become smaller in cross-sectional area than longitudinal ends thereof.
  • an object of examples of this invention is to prevent casting defects from occurring in casting the lower casing of the crankcase for supporting the crankshaft and to maintain good strength of the lower casing supporting the crankshaft.
  • a lower casing of an engine crankcase comprising: a pair of left and right aluminum side members 11, 12 extending along a crankshaft 5 and disposed on the left and right thereof; and a laterally extending cross member 13 provided between the side members 11, 12, the cross member 13 including: an aluminum cross member body 14 provided between the side members 11, 12; and a cast-iron supporting member 17 formed with a semicircular supporting recess 15 on its top surface 16 for the crankshaft 5 to be fitted in at the lower half of its journal 4, and built in the cross member body 14 while leaving the top surface 16, the side members 11, 12 and the cross member body 14 being formed together through aluminum casting by using the supporting member 17 as an insert member, in which a notch 23 is formed at a lower end of the supporting member 17 below the supporting recess 15.
  • the notch 23 has a ceiling 24 formed in an arcuate protrusion approximately centered on an axis 3 of the crankshaft 5.
  • a bottom surface 25 of the cross member body 14 below the supporting recess 15 is formed in an arcuate protrusion approximately centered on the axis 3 of the crankshaft 5.
  • a further aspect of the invention provides a mold for use in casting a lower casing as described herein.
  • a further aspect provides a method of casting a lower casing as described herein.
  • a further aspect of the invention provides a supporting member for use in casting a lower casing as described herein.
  • a lower casing of an engine crankcase comprising:
  • a further aspect of the invention provides an insert member for use in casting a lower casing of an engine crankcase, the insert member comprising a notch configured to increase the cross-sectional area of a part of the lower casing.
  • the insert and/or mold is such that longitudinal cross sections of parts of the casing are made more equal in area to one another. Preferably the cross sections are substantially equal.
  • a further aspect of the invention provides a lower casing of an engine crankcase comprising a cross member body and a supporting member, at least part of the cross section of the cross member body being defined by a lower surface of the supporting member, wherein the lower surface of the supporting member comprises a notch such that the cross sectional area of the cross member body in the region of the notch is substantially invariable in a longitudinal direction.
  • Also provided by the invention is a supporting member or insert member as described herein.
  • reference numeral 1 denotes a four-stroke multi-cylinder (four-cylinder) engine (internal combustion engine).
  • the engine 1 comprises a crankcase 2, a crankshaft 5 including a journal 4 supported by the crankcase 2 to be rotatable about its approximately horizontally extending axis 3, and an oil pan 6 supported at a lower end of the crankcase 2.
  • the crankcase 2 is divided into an upper and a lower casing 7, 8 with reference to the axis 3 of the crankshaft 5.
  • the upper and the lower casings 7, 8 are connectable to each other with fasteners 9.
  • the crankshaft 5 is interposed and supported between the upper and the lower casings 7, 8.
  • the lower casing 8 is shaped like a ladder frame.
  • the lower casing 8 comprises a pair of left and right aluminum side members 11, 12 extending along the crankshaft 5 and disposed on the left and right thereof, and a laterally extending cross member 13 provided between the side members 11, 12.
  • the cross member 13 comprises an aluminum cross member body 14 provided between the side members 11, 12, and a cast-iron supporting member 17 formed with a semicircular supporting recess 15 on its top surface 16 for the crankshaft 5 to be fitted in and supported at the lower half of the journal 4, and built in the cross member body 14 while leaving the top surface 16.
  • the supporting recess 15 has an arcuate surface approximately centered on the axis 3 of the crankshaft 5.
  • the supporting member 17 comprises a supporting member body 19 shaped like a cuboid as a whole and formed with the supporting recess 15 on its top surface 16, and a projecting rib 20 integrally formed on an outer surface of the supporting member body 19 around the edge of the supporting recess 15 (the axial edge of the crankshaft 5).
  • the rib 20 is formed in an arcuate shape approximately centered on the axis 3 of the crankshaft 5.
  • a notch 23 is formed at a lower end of the supporting member 17 below the supporting recess 15.
  • the notch 23 is formed to face approximately the entire region of the supporting recess 15.
  • the notch 23 has a ceiling 24 formed in an arcuate protrusion approximately centered on the axis 3 of the crankshaft 5.
  • the cross member body 14 below the supporting recess 15 has a bottom surface 25 formed in an arcuate protrusion approximately centered on the axis 3 of the crankshaft 5 and protruded downward of the bottom surface of the supporting member 17.
  • longitudinal (lateral) cross sections of the cross member body 14 below the supporting recess 15 are made generally equal in area to one another.
  • the supporting member 17 is built in the cross member body 14 while leaving its top surface 16 and the rib 20 close to the top surface 16.
  • the side members 11, 12 and the cross member body 14 are formed together through aluminum casting by using the supporting member 17 as an insert member.
  • a mold for the lower casing 8 is formed with the supporting member 17 as an insert member disposed in position.
  • liquid aluminum A is poured into an inner mold of the mold for the side member 11, that is, one of inner molds for the side members 11, 12.
  • the liquid aluminum A flows along inside of an inner mold for the cross member body 14 longitudinally from the inner mold for one of the side members 11 toward the inner mold for the other side member 12. Filling the inside of the mold with the liquid aluminum A in such a way as described forms the lower casing 8, with the supporting member 17 built in the cross member body 14.
  • the notch 23 is formed at the lower end of the supporting member 17 below the supporting recess 15.
  • Forming the notch 23 provides increased cross-sectional area of a longitudinal midsection of the cross member body 14 below the supporting recess 15.
  • the midsection of the cross member body 14 has a top surface formed with a recess of a semicircular shape corresponding to the shape of the supporting recess 15 formed on the top surface 16 of the supporting member 17.
  • the midsection of the cross member body 14, therefore, tends to become smaller in cross-sectional area than longitudinal ends thereof. Forming the notch 23, however, allows the midsection of the cross member body 14 to be increased in cross-sectional area as described above, so that the longitudinal cross sections of the cross member body 14 are made more equal in area to one another.
  • the ceiling 24 of the notch 23 is formed in an arcuate protrusion approximately centered on the axis 3 of the crankshaft 5, as described above.
  • bottom surface 25 of the cross member body 14 below the supporting recess 15 is formed in an arcuate protrusion approximately centered on the axis 3 of the crankshaft 5, as described above.
  • the ceiling 24 of the notch 23, as well as the bottom surface 25 of the midsection of the cross member body 14, is formed in an arcuate protrusion approximately centered on the axis 3 of the crankshaft 5, as described above. Therefore, the longitudinal cross sections of the cross member body 14 below the supporting recess 15 are made generally equal in area to one another.
  • the engine may be a two-stroke single-cylinder engine.
  • Forming the notch provides increased cross-sectional area of a longitudinal midsection of the cross member body below the supporting recess.
  • the midsection of the cross member body has a top surface formed with a recess of a semicircular shape corresponding to the shape of the supporting recess formed on the top surface of the supporting member.
  • the midsection of the cross member body therefore, tends to become smaller in cross-sectional area than longitudinal ends thereof. Forming the notch, however, allows the midsection of the cross member body to be increased in cross-sectional area as described above, so that longitudinal cross sections of the cross member body are made more equal in area to one another.
  • the notch has a ceiling formed in an arcuate protrusion approximately centered on an axis of the crankshaft.
  • a bottom surface of the cross member body below the supporting recess is formed in an arcuate protrusion approximately centered on the axis of the crankshaft.
  • the ceiling of the notch, as well as the bottom surface of the midsection of the cross member body is formed in an arcuate protrusion approximately centered on the axis of the crankshaft. Therefore, the longitudinal cross sections of the cross member body below the supporting recess are made generally equal in area to one another.
  • This can reliably prevent further unevenness from occurring, at the time of casting, in the flow of the liquid in the inner mold for the cross member body below the supporting recess, as well as casting defects including pores.
  • an engine 1 includes a pair of left and right aluminum side members 11, 12 extending along a crankshaft 5 and disposed on the left and right thereof, and a laterally extending cross member 13 provided between the side members 11, 12.
  • the cross member 13 comprises an aluminum cross member body 14 provided between the side members 11, 12, and a cast-iron supporting member 17 formed with a semicircular supporting recess 15 on its top surface 16 for the crankshaft 5 to be fitted in at the lower half of its journal 4, and built in the cross member body 14 while leaving the top surface 16.
  • the side members 11, 12 and the cross member body 14 are formed together through aluminum casting by using the supporting member 17 as an insert member.
  • a notch 23 is formed at a lower end of the supporting member 17 below the supporting recess 15.
  • Such an arrangement can prevent casting defects from occurring in casting a lower casing of a crankcase for supporting a crankshaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
EP08001889A 2003-05-28 2004-05-28 Unterkurbelgehäuse einer Brennkraftmaschine Withdrawn EP1911956A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003150391A JP2004353511A (ja) 2003-05-28 2003-05-28 エンジンにおけるクランクケースの下部ケース
EP04253155A EP1482157B1 (de) 2003-05-28 2004-05-28 Unterteil eines Kurbelgehäuses einer Brennkraftmaschine

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP04253155A Division EP1482157B1 (de) 2003-05-28 2004-05-28 Unterteil eines Kurbelgehäuses einer Brennkraftmaschine
EP04253155.8 Division 2004-05-28

Publications (2)

Publication Number Publication Date
EP1911956A2 true EP1911956A2 (de) 2008-04-16
EP1911956A3 EP1911956A3 (de) 2012-09-26

Family

ID=32677679

Family Applications (2)

Application Number Title Priority Date Filing Date
EP08001889A Withdrawn EP1911956A3 (de) 2003-05-28 2004-05-28 Unterkurbelgehäuse einer Brennkraftmaschine
EP04253155A Expired - Fee Related EP1482157B1 (de) 2003-05-28 2004-05-28 Unterteil eines Kurbelgehäuses einer Brennkraftmaschine

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04253155A Expired - Fee Related EP1482157B1 (de) 2003-05-28 2004-05-28 Unterteil eines Kurbelgehäuses einer Brennkraftmaschine

Country Status (6)

Country Link
EP (2) EP1911956A3 (de)
JP (1) JP2004353511A (de)
CN (1) CN100567722C (de)
DE (1) DE602004012795T2 (de)
GB (1) GB2402171B (de)
MY (1) MY136806A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103375300B (zh) * 2012-04-13 2016-05-04 比亚迪股份有限公司 一种发动机下机体结构及具有该结构的发动机
JP6904232B2 (ja) 2017-12-14 2021-07-14 トヨタ自動車株式会社 内燃機関のラダーフレーム
KR102394867B1 (ko) * 2017-12-27 2022-05-06 현대자동차주식회사 엔진 베드 플레이트의 주철 인서트 매입 구조 및 방법
CN111059156A (zh) * 2019-12-25 2020-04-24 芜湖航瑞航空动力产业技术研究院有限公司 发动机主轴承座

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10331715A (ja) 1997-05-29 1998-12-15 Suzuki Motor Corp ラダーフレーム構造

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DE3545722C1 (de) * 1985-12-21 1987-01-29 Porsche Ag Verfahren zum Ausrichten von Lagerdeckeln an Lagerabschnitten eines Kurbelgehaeuses
US5203854A (en) * 1991-02-06 1993-04-20 Ab Volvo Main bearing cap for internal combustion engines
DE4433801C1 (de) * 1994-09-22 1995-11-02 Porsche Ag Lagergestell für eine Brennkraftmaschine
DE19532326C1 (de) * 1995-09-01 1997-01-02 Daimler Benz Ag Kurbelgehäuse
DE19537191A1 (de) * 1995-10-06 1997-04-10 Porsche Ag Kurbelwellenlagerung für eine Brennkraftmaschine
US6422755B1 (en) * 1996-05-03 2002-07-23 Gkn Sinter Metals-Germantown, Inc. Precisely repositioning powder metal components
DE19640719C1 (de) * 1996-10-02 1997-10-16 Iav Motor Gmbh Lagerbett für die Kurbelwellenlagerung von Verbrennungsmotoren
JPH10196451A (ja) * 1997-01-17 1998-07-28 Suzuki Motor Corp エンジンのクランク室構造
DE19810464C1 (de) * 1998-03-11 1999-06-02 Daimler Chrysler Ag Kurbelgehäuse für eine Brennkraftmaschine
AT407185B (de) * 1998-06-03 2001-01-25 Miba Sintermetall Ag Kurbelgehäuse aus leichtmetall für einen verbrennungsmotor
JP2000337348A (ja) * 1999-05-31 2000-12-05 Toyota Motor Corp クランクシャフト用軸受
AT3760U1 (de) * 1999-08-19 2000-07-25 Avl List Gmbh Zylinder-kurbelgehäuse für eine brennkraftmaschine
EP1321656B1 (de) * 2001-12-21 2007-02-14 Ford Global Technologies, LLC Hauptlagerdeckel für eine Brennkraftmaschine
JP3948272B2 (ja) * 2001-12-21 2007-07-25 スズキ株式会社 エンジンの軸受キャップの製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10331715A (ja) 1997-05-29 1998-12-15 Suzuki Motor Corp ラダーフレーム構造

Also Published As

Publication number Publication date
JP2004353511A (ja) 2004-12-16
MY136806A (en) 2008-11-28
GB0412047D0 (en) 2004-06-30
EP1482157A1 (de) 2004-12-01
GB2402171A (en) 2004-12-01
CN100567722C (zh) 2009-12-09
EP1911956A3 (de) 2012-09-26
CN1573065A (zh) 2005-02-02
EP1482157B1 (de) 2008-04-02
DE602004012795D1 (de) 2008-05-15
GB2402171B (en) 2006-09-06
DE602004012795T2 (de) 2009-04-30

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