EP0275841A2 - Process for obtaining a valve seat - Google Patents

Process for obtaining a valve seat Download PDF

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Publication number
EP0275841A2
EP0275841A2 EP87830446A EP87830446A EP0275841A2 EP 0275841 A2 EP0275841 A2 EP 0275841A2 EP 87830446 A EP87830446 A EP 87830446A EP 87830446 A EP87830446 A EP 87830446A EP 0275841 A2 EP0275841 A2 EP 0275841A2
Authority
EP
European Patent Office
Prior art keywords
valve seat
obtaining
intake duct
milling
housing
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Withdrawn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
EP87830446A
Other languages
German (de)
French (fr)
Other versions
EP0275841A3 (en
Inventor
Luigi Joli
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0275841A2 publication Critical patent/EP0275841A2/en
Publication of EP0275841A3 publication Critical patent/EP0275841A3/en
Withdrawn legal-status Critical Current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
    • F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
    • 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
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Definitions

  • This invention concerns a process for obtaining a valve seat in an intake duct of an internal combustion engine.
  • the current process for obtaining a valve seat in an intake duct of an internal combustion engine consists in the following stages:
  • the purpose of the invention is to make this operation less expensive, while maintaining at least the same engine performance, but eliminat­ing the stage c. of the known process which is the most difficult to perform in as far as edges could remain due to the machining itself.
  • This purpose is achieved by a process for obtaining a valve seat in an intake duct of an internal combustion engine, characterized in that the process consists in the following machining stages:
  • 1 indicates a part of a light alloy cylinder head of an internal combustion engine cut away in correspon­dence of one of the intake ducts.
  • a housing 2 has been obtained, by milling or other suitable machining, at the exit of the feed duct, capable of receiving a valve seat 3 made for example from cast iron, which is put in place by driving.
  • the above valve seat has an inside diameter hole 4, substantially equal to the inside diameter of the intake duct at the point where the housing 2 is obtained.
  • it is equipped, at the time of driving it in, with a bilateral chamfer 5.
  • valve rest chamfer 6 is made, which has an inclination generally of 45 degrees and whose axis is coaxial with that of the valve guide 7.
  • the duct thus obtained eliminating the finishing operation on the junction point between valve seat and the duct itself, has a step 8 due to the difference between the two diameters resulting from the chamfer.
  • the above step being favourable to the direction of the feeding mixture flow, it does not hinder in any way the engine perfor­mance and at the same time prevents the formation, either by mere chance or as a result of poor machining, of adverse steps which, as it can be easily inferred, would be a hindrance to the free passage of the flow itself.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lift Valve (AREA)
  • Rolling Contact Bearings (AREA)
  • Forging (AREA)

Abstract

The invention concerns a process for obtaining a valve seat (3) in an intake duct of an internal combustion engine in which the finishing milling of the duct is eliminated, thus obtaining improvements in engine performance.

Description

  • This invention concerns a process for obtaining a valve seat in an intake duct of an internal combustion engine.
  • The current process for obtaining a valve seat in an intake duct of an internal combustion engine consists in the following stages:
    • a. milling of the cylinder head to obtain a valve seat housing in cast iron or other suitable material;
    • b. driving of valve seat;
    • c. milling of the junction point between driven valve seat and housing edge on the intake duct in order to eliminate any diameter differences;
    • d. machining of the valve rest chamfer on the cast iron valve seat.
  • The purpose of the invention is to make this operation less expensive, while maintaining at least the same engine performance, but eliminat­ing the stage c. of the known process which is the most difficult to perform in as far as edges could remain due to the machining itself.
  • This purpose is achieved by a process for obtaining a valve seat in an intake duct of an internal combustion engine, characterized in that the process consists in the following machining stages:
    • a. milling of the cylinder head to obtain the housing for a valve seat ring in cat iron or other suitable material;
    • b. driving in the housing thus obtained of a valve seat with inside diameter equal to the intake duct diameter and equipped with bilateral chamfer;
    • c. milling of the valve rest chamfer.
  • Further characteristics and advantages will become clear from the following description, referred to the attached figures, provided merely by way of non-limitative example, of which:
    • - Fig. 1 is a cross section of the object obtained with the process of the invention;
    • - Fig. 2 is an enlargement of a detail in Fig. 1.
  • With reference to the figures, 1 indicates a part of a light alloy cylinder head of an internal combustion engine cut away in correspon­dence of one of the intake ducts.
  • In it, a housing 2 has been obtained, by milling or other suitable machining, at the exit of the feed duct, capable of receiving a valve seat 3 made for example from cast iron, which is put in place by driving.
  • The above valve seat has an inside diameter hole 4, substantially equal to the inside diameter of the intake duct at the point where the housing 2 is obtained. In addition, it is equipped, at the time of driving it in, with a bilateral chamfer 5.
  • After the valve seat has been driven in place, the valve rest chamfer 6 is made, which has an inclination generally of 45 degrees and whose axis is coaxial with that of the valve guide 7.
  • The duct thus obtained, eliminating the finishing operation on the junction point between valve seat and the duct itself, has a step 8 due to the difference between the two diameters resulting from the chamfer.
  • However, the above step being favourable to the direction of the feeding mixture flow, it does not hinder in any way the engine perfor­mance and at the same time prevents the formation, either by mere chance or as a result of poor machining, of adverse steps which, as it can be easily inferred, would be a hindrance to the free passage of the flow itself.

Claims (1)

1. Process for obtaining a valve seat in an intake duct of an internal combustion engine, characterized in that the process consists in the following machining stages:
a. milling of the cylinder head to obtain the housing for a valve seat ring in cast iron or other suitable material;
b. driving in the housing thus obtained of a valve seat with inside diameter equal to the intake duct diameter and equipped with bilateral chamfer;
c. milling of the valve rest chamfer.
EP87830446A 1986-12-23 1987-12-17 Process for obtaining a valve seat Withdrawn EP0275841A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67963/86A IT1196870B (en) 1986-12-23 1986-12-23 PROCEDURE FOR OBTAINING A VALVE SEAT
IT6796386 1986-12-23

Publications (2)

Publication Number Publication Date
EP0275841A2 true EP0275841A2 (en) 1988-07-27
EP0275841A3 EP0275841A3 (en) 1990-01-31

Family

ID=11306764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87830446A Withdrawn EP0275841A3 (en) 1986-12-23 1987-12-17 Process for obtaining a valve seat

Country Status (4)

Country Link
EP (1) EP0275841A3 (en)
BR (1) BR8706933A (en)
IT (1) IT1196870B (en)
YU (1) YU47052B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029881A1 (en) * 1990-09-21 1992-04-02 Porsche Ag IC engine valve seat ring - avoids projecting into combustion chamber by mounting ring in cylinder head above chamber
EP0849463A1 (en) * 1996-12-21 1998-06-24 Daimler-Benz Aktiengesellschaft Cylinder head for an internal combustion engine
WO1999032779A1 (en) * 1997-12-23 1999-07-01 Scania Cv Aktiebolag (Publ) Cylinder head for internal combustion engine
EP1967705A1 (en) * 2007-03-07 2008-09-10 Renault SAS Valve seat for intake duct, heat engine cylinder head and manufacturing method
FR2926111A3 (en) * 2008-01-03 2009-07-10 Renault Sas Cylinder head manufacturing method for e.g. petrol engine of motor vehicle, involves assembling valve seat in gas inlet conduit, and modifying valve seat in upstream of valve face to transform valve seat into flat valve seat
US20170175670A1 (en) * 2015-12-17 2017-06-22 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle having the same, and method for manufacturing internal combustion engine
CN113557351A (en) * 2019-03-13 2021-10-26 卡特彼勒公司 Valve seat insert for engine cylinder head having venturi flow crown and seating surface configured to limit valve recession

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR822334A (en) * 1937-05-28 1937-12-28 Improvements to cylinder blocks for internal combustion engines
GB1042147A (en) * 1962-04-05 1966-09-14 Humber Ltd Improvements relating to cylinders or cylinder heads for internal combustion engines
DE2048567A1 (en) * 1969-10-02 1971-04-15 Parry, John, Orilha, Ontario (Kana da) Method for replacing a valve seat in a cylinder head
AT331575B (en) * 1972-06-20 1976-08-25 List Hans COMBUSTION ENGINE WITH INNER MIXTURE, IN PARTICULAR DIESEL ENGINE
GB1494244A (en) * 1974-02-16 1977-12-07 Maschf Augsburg Nuernberg Ag Cylinder head for internal combustion engine
AT378827B (en) * 1983-06-23 1985-10-10 Avl Verbrennungskraft Messtech INTERNAL COMBUSTION ENGINE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR822334A (en) * 1937-05-28 1937-12-28 Improvements to cylinder blocks for internal combustion engines
GB1042147A (en) * 1962-04-05 1966-09-14 Humber Ltd Improvements relating to cylinders or cylinder heads for internal combustion engines
DE2048567A1 (en) * 1969-10-02 1971-04-15 Parry, John, Orilha, Ontario (Kana da) Method for replacing a valve seat in a cylinder head
AT331575B (en) * 1972-06-20 1976-08-25 List Hans COMBUSTION ENGINE WITH INNER MIXTURE, IN PARTICULAR DIESEL ENGINE
GB1494244A (en) * 1974-02-16 1977-12-07 Maschf Augsburg Nuernberg Ag Cylinder head for internal combustion engine
AT378827B (en) * 1983-06-23 1985-10-10 Avl Verbrennungskraft Messtech INTERNAL COMBUSTION ENGINE

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029881A1 (en) * 1990-09-21 1992-04-02 Porsche Ag IC engine valve seat ring - avoids projecting into combustion chamber by mounting ring in cylinder head above chamber
EP0849463A1 (en) * 1996-12-21 1998-06-24 Daimler-Benz Aktiengesellschaft Cylinder head for an internal combustion engine
US6053141A (en) * 1996-12-21 2000-04-25 Daimlerchrysler Ag Cylinder head for internal-combustion engines
WO1999032779A1 (en) * 1997-12-23 1999-07-01 Scania Cv Aktiebolag (Publ) Cylinder head for internal combustion engine
US6240891B1 (en) 1997-12-23 2001-06-05 Scania Cv Aktiebolag (Publ) Cylinder head for internal combustion engine
EP1967705A1 (en) * 2007-03-07 2008-09-10 Renault SAS Valve seat for intake duct, heat engine cylinder head and manufacturing method
FR2913457A1 (en) * 2007-03-07 2008-09-12 Renault Sas VALVE SEAT FOR INTAKE DUCT, THERMAL MOTOR HEAD, AND METHOD OF MANUFACTURE.
FR2926111A3 (en) * 2008-01-03 2009-07-10 Renault Sas Cylinder head manufacturing method for e.g. petrol engine of motor vehicle, involves assembling valve seat in gas inlet conduit, and modifying valve seat in upstream of valve face to transform valve seat into flat valve seat
US20170175670A1 (en) * 2015-12-17 2017-06-22 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle having the same, and method for manufacturing internal combustion engine
CN113557351A (en) * 2019-03-13 2021-10-26 卡特彼勒公司 Valve seat insert for engine cylinder head having venturi flow crown and seating surface configured to limit valve recession
CN113557351B (en) * 2019-03-13 2024-03-05 卡特彼勒公司 Valve seat insert for an engine head having a venturi flow crown and a seating surface configured to limit valve recess

Also Published As

Publication number Publication date
BR8706933A (en) 1988-07-26
EP0275841A3 (en) 1990-01-31
IT8667963A0 (en) 1986-12-23
YU229087A (en) 1990-02-28
IT1196870B (en) 1988-11-25
YU47052B (en) 1994-12-28

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