EP0241185A1 - Montage de la commande de soupapes disposées radialement dans un moteur à combustion interne - Google Patents

Montage de la commande de soupapes disposées radialement dans un moteur à combustion interne Download PDF

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Publication number
EP0241185A1
EP0241185A1 EP87302628A EP87302628A EP0241185A1 EP 0241185 A1 EP0241185 A1 EP 0241185A1 EP 87302628 A EP87302628 A EP 87302628A EP 87302628 A EP87302628 A EP 87302628A EP 0241185 A1 EP0241185 A1 EP 0241185A1
Authority
EP
European Patent Office
Prior art keywords
valve
pair
rocker member
valves
actuating
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Withdrawn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
EP87302628A
Other languages
German (de)
English (en)
Inventor
George Kingsley Cureton
Gary John White
Joseph Scalzo
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.)
Scalzo Patents Pty Ltd
Original Assignee
Scalzo Patents Pty 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 Scalzo Patents Pty Ltd filed Critical Scalzo Patents Pty Ltd
Publication of EP0241185A1 publication Critical patent/EP0241185A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/262—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with valve stems disposed radially from a centre which is substantially the centre of curvature of the upper wall surface of a combustion chamber
    • 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
    • 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
    • F02F2001/246—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis and orientated radially from the combustion chamber surface

Definitions

  • This invention relates to internal combustion engine valve trains, and is applicable to all internal combustion engines.
  • the present invention reduces substantially the number of moving parts required to transmit the reciprocating motion of the cam follower to valves radially disposed about the center of curvature of the combustion chamber.
  • a valve actuating arrangement in which, for a pair of valves, there is a respective rocker member for each valve and a single push rod (or cam follower) member, with each rocker member being movable under the action of the single rod for simultaneously actuating each valve of the pair thereof.
  • a respective such arrangement is provided for each of a pair of inlet valves and a pair of exhaust valves.
  • the rod of each arrangement can be movable under the action of a cam provided on a common, or respective, camshaft.
  • one inlet cam operates a cam follower which in turn operates two inlet rockers.
  • Each inlet rocker is mounted on a shaft inclined at an angle enabling each rocker shaft axis to be both perpend­icular to its respective valve stem axis and to the inlet cam follower axis.
  • This enables the rocker tappet contacting the valve stem to act in line with the valve stem thus eliminating undesirable wear due to misalignment.
  • This invention also eliminates the necessity of any type of intermediate "rockers" between the tappet and valve stem to ensure correct alignment.
  • an exhaust cam operates an exhaust cam follower which in turn operates two exhaust cam rockers, rotating on shafts perpendicular to both their respective exhaust valve and the exhaust cam follower.
  • valves are aligned on radial lines radiating from the centre of curvature of the combustion chamber which is a segment of a sphere. This produces a substantially smooth combustion chamber and the radial valve arrangement allows the radius of curvature to be quite large, eliminating the necessity of a domed piston crown or of valve reliefs in order to maintain high compression ratios without detonation or 'knock', therefore substantially improving the efficiency of the combustion process and improving fuel economy.
  • each rocker member is reversably rotatable about an axis which is substantially perpendicular to a centre line of action or movement of its valve. Additionally, or alternatively, that axis preferably is substantially perpendicular to the line of action or movement of the single rod. However, the axis of each rocker member of the pair thereof preferably are mutually inclined.
  • Each rocker member may comprise a body portion and a first and second arm extending outwardly from the body portion; with the first arm of each being engageable by the single rod and each second arm being engageable with the respective valve.
  • the body portion may be of annular or cylindrical form concentric with respect to the axis of its rocker member, with the rocker member being either rotatable on, or with, a shaft extending axially through its body portion.
  • FIGS 1 and 2 show enough detail of an engine to illustrate clearly the application of the invention.
  • the arrangement 10 has a camshaft 12, driven by some form of drive which is not relevant here, and is supported by bearings at 14 and 16.
  • Camshaft 12 has formed thereon an inlet cam profile 18 and an exhaust cam profile 20; although cams 18,20 can be on respective shafts, as in Figure 3, rather than on a single camshaft.
  • Cams 18,20 are rotated by shaft 12 at a predeter necessarilymined ratio of engine speed. As cams 18,20 rotate, they cause respective inlet cam follower 22 and exhaust cam follower 24 to reciprocate in respective follower bores 26,28.
  • inlet rockers 30,32 Adjacent the end of inlet cam follower 22 remote from shaft 12, there is a pair of inlet rockers 30,32, each for controlling the opening and closing of a respective one of inlet valves 34,36.
  • Rockers 30,32 are rotatably mounted on respective rocker shafts 38,40; each of shafts 38,40 having a respective axis 42,44 which is offset from, and perpendicular to the axis 46 of bore 26 and each offset from and perpendicular to the axis 48,50 of the respective valve 34,36.
  • Inlet cam follower 22 has a surface 52 which contacts a respective offset arm 54,56 of each of rockers 30,32. Also, each of rockers 30,32 has a tappet arm 58,60 each of which holds a respective tappet 62,64 of either fixed or hydraulic lash adjusting type. Each of tappets 62,64 actuate the associated one of inlet valves 34,36; with the latter being radially aligned to the centre of curvature 66 of the combustion chamber 68 of piston 70.
  • the end of exhaust cam follower 24 remote from shaft 12 has a surface 53 which contacts offset arms 55,57 of exhaust rockers 31,33.
  • rockers 31,33 are rotatably mounted on rocker shafts 39,41, the axes 43,45 of which are oriented so that they are offset from, and perpendicular to the axis 47 of bore 28 and each offset from, and perpendicular to, the axes 49,51 of the respective exhaust valves 35,37.
  • Tappet arms 59,61 formed on rockers 31,33 hold tappets 63,65. Again tappets 63,65 are of fixed or hydraulic lash adjusting type, and they actuate spring loaded exhaust valves 35,37 which are radially aligned to centre of curvature 66 of chamber 68.
  • Figures 1 and 2 which, as indicated, shows an axial engine crankshaft arrangement, shaft 12 extends parallel to the one piston 70.
  • Figures 3 and 4 show one cylinder of an in-line engine, with the camshafts thereof extending along the line and, in this instance, offset to one side of the pistons.
  • arrangement 100 has twin camshafts 112,112 ⁇ , each carrying a respective cam 118,120 for reciprocating cam followers 122,124.
  • each of the inlet valves is actuated simultaneously by a respective rocker, but under the action of a single cam follower; while the same applies to the pair of outlet valves.
  • either splash or pressure type of lubrication can be employed.
  • Passages formed in the cylinder head and/or in the rocker shafts can provide oil under pressure to the rockers, and passages formed in the tappet arms can provide oil supply to the hydraulic lash adjusters or to adjustable tappets.
  • valve inlet valve, with the other one being an outlet valve.
  • outlet valve the respective valve functions can be the reverse of that designated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP87302628A 1986-04-01 1987-03-26 Montage de la commande de soupapes disposées radialement dans un moteur à combustion interne Withdrawn EP0241185A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU5260/86 1986-04-01
AU526086 1986-04-01

Publications (1)

Publication Number Publication Date
EP0241185A1 true EP0241185A1 (fr) 1987-10-14

Family

ID=3695721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87302628A Withdrawn EP0241185A1 (fr) 1986-04-01 1987-03-26 Montage de la commande de soupapes disposées radialement dans un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0241185A1 (fr)
JP (1) JPS6380007A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5067124B2 (ja) * 2007-11-05 2012-11-07 三菱自動車工業株式会社 エンジンの燃焼室構造
JP6183246B2 (ja) * 2014-03-06 2017-08-23 マツダ株式会社 エンジンの動弁装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB206898A (en) * 1922-08-08 1923-11-08 Rudge Whitworth Ltd Improvements in valve mechanism for internal combustion engines
GB403666A (en) * 1932-06-27 1933-12-27 Manfredo Giannotti Improvements in and relating to valve mechanisms for internal combustion motors and compressors
DE1300578B (de) * 1966-12-24 1969-08-07 Bayerische Motoren Werke Ag Ventilsteuerung fuer Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB206898A (en) * 1922-08-08 1923-11-08 Rudge Whitworth Ltd Improvements in valve mechanism for internal combustion engines
GB403666A (en) * 1932-06-27 1933-12-27 Manfredo Giannotti Improvements in and relating to valve mechanisms for internal combustion motors and compressors
DE1300578B (de) * 1966-12-24 1969-08-07 Bayerische Motoren Werke Ag Ventilsteuerung fuer Brennkraftmaschinen

Also Published As

Publication number Publication date
JPS6380007A (ja) 1988-04-11

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Effective date: 19880415

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Inventor name: WHITE,GARY JOHN

Inventor name: CURETON,GEORGE KINGSLEY

Inventor name: SCALZO,JOSEPH