WO1991010046A1 - Tete de cylindre pour moteurs endothermiques alternatifs munis d'au moins une soupape d'aspiration ou d'echappement - Google Patents

Tete de cylindre pour moteurs endothermiques alternatifs munis d'au moins une soupape d'aspiration ou d'echappement Download PDF

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Publication number
WO1991010046A1
WO1991010046A1 PCT/IT1990/000102 IT9000102W WO9110046A1 WO 1991010046 A1 WO1991010046 A1 WO 1991010046A1 IT 9000102 W IT9000102 W IT 9000102W WO 9110046 A1 WO9110046 A1 WO 9110046A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
suction
exhaust
cylinder head
actuated
Prior art date
Application number
PCT/IT1990/000102
Other languages
English (en)
Inventor
Armando Romano
Original Assignee
Armando Romano
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 Armando Romano filed Critical Armando Romano
Publication of WO1991010046A1 publication Critical patent/WO1991010046A1/fr

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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
    • F01L1/44—Multiple-valve gear or arrangements, not provided for in preceding subgroups, e.g. with lift and different valves
    • F01L1/446—Multiple-valve gear or arrangements, not provided for in preceding subgroups, e.g. with lift and different valves comprising a lift valve and at least one reed valve

Definitions

  • the present invention relates to a cylinder head for endothermic reciprocating engines, which cylinder head possesses at least one valve actuated either for suction or for exhaust.
  • the suction and exhaust in engines of this type are controlled by means of at least two valves of the poppet type, actuated by means of cams, one for controlling the suction phase and one for controlling the exhaust phase of the burnt gases.
  • valves of the abovementioned type are employed, usually of equal size.
  • asymmetrical valves are employed, where the induction valve is larger than the exhaust valve, or alternatively multiple-valve arrangements, for example two induction valves and one exhaust valve. In some cases, as many as five valves per cylinder have been used.
  • non-return flap valves are widely employed in reciprocating (piston-type) compressors for gas or air.
  • reciprocating pneuating
  • flap valves In endothermic reciprocating engines, the use of flap valves has been suggested (Utility Model Application no. 2314IB/80 in the name of Alfa Romeo S.p.A.; Patent Applications no. 22886A/82 and no. 19397A/83 in the name of Alfa Romeo Auto S.p.A.; Patent Application no. 19766A/88 in the name of Alfa Lancia Industriale S.p.A.; EP-A-0 268 339 in the name of Adler S.p.A) for controlling the flow of suction gases.
  • the present invention provides a cylinder head for endothermic reciprocating engines, which comprises at least one valve actuated either for suction or for exhaust interacting with a first and a second arrangement of valves of the flap type acting as non-return or unidirectional valves and comprising flexible flaps, the first arrangement permitting the passage towards the cylinder only of the suction gases, and the second permitting the discharge towards the exhaust manifold only of the burnt gases, the said at least one valve being formed by a poppet valve of a substantially conventional type actuated by a rotating camshaft synchronised with the drive shaft.
  • the at least one valve is disposed to interact with a cam-follower actuated by a single-lobe cam associated with a camshaft disposed to cause the opening of the at least one valve to coincide with the suction phase and with the exhaust phase.
  • the cylinder head may comprise a further actuated valve associated with a further suction duct, the further valve being associated with a further camshaft disposed to actuate the opening thereof during the suction phase.
  • the inlet manifold connected to the said at least one valve and the inlet manifold connected to the further valve are connected in a switchable manner to first and second carburetion means.
  • Figures 1, 2, 3 and 4 successively show the cylinder head arrangement according to the present invention respectively in the phases of suction, compression at top dead centre, combustion and exhaust in a first embodiment
  • FIGS 5, 6, 7 and 8 successively show a second embodiment of the cylinder head according to the present invention, respectively in the phases of suction, compression at top dead centre, combustion and exhaust;
  • Figure 9 shows diagrammatically the timing of the valves in conventional internal combustion engines and in internal combustion engines according to the first and second embodiments of the present invention.
  • a typical four-stroke engine comprises a cylinder block 1 on which is machined or fixed a cylinder 2 within which slides a piston 3, connected in a known manner via a piston pin 4 and a connecting rod 5 to the drive shaft (not shown) .
  • the cylinder head designated as a whole by 6 comprises a chamber 7, which for example is hemispherical, bearing a seat 8 for the head 9 of a valve 10 of known structure.
  • the valve 10 is associated with conventional spring and cam-follower means indicated respectively at 11, 12 which interact with a cam 13 fixed to a camshaf 1 .
  • An inlet duct 15 and an exhaust duct 16 converge in the zone of action of the valve 10 and are connected respectively at 17, 18 to the conventional inlet and exhaust manifolds (not shown) .
  • non-return flap valves indicated as a whole by 19, 20 and comprising a body and, respectively, flaps 21, 22 disposed to permit the flow only in the direction of the arrows FA, FS.
  • Figures 5 to 8 show a variation of the embodiment described above.
  • an auxiliary inlet of valve of conventional type is provided in order further to increase the trapping coefficient of the internal combus ⁇ tion engine.
  • the provision of the auxiliary inlet valve makes it possible to increase the trapping coefficient to a much greater extent relative to the known multi-valve arrangements in so far as the valve which is actuated with a double suction/exhaust function makes it possible to have inlet ports having a much greater active area than that which is possible with the valves of separate function (suction and exhaust) of the known arrangements.
  • the cylinder head possesses a structure identical to that described above with reference to Figures 1 to 4.
  • an additional inlet manifold designated 50 inter ⁇ acting with a poppet valve 51 actuated by a cam 52 fixed to a second camshaft 53.
  • the return spring and the cam- follower 54 of the poppet valve 51 may be seen behind the exhaust duct 16'.
  • the poppet valve 51 also comes into operation, actuated by the cam 52. It should be noted that the timing of the move ⁇ ment of the poppet valve 51 may be different from that of the valve 10' in order further to improve the suction performance, given that the poppet valve 51 is not subject to the constraints mentioned above for the valve not subject to the constraints mentioned above for the valve 10' .
  • the 10' can be predetermined in order to optimise its performance in the exhaust phase; the adverse consequences arising therefrom for the suction phase can be compensated by modifying the timing of the valve 51.
  • the double-valve arrangement 10', 51 permits optimisations which would not be possible with conventional engines. This derives from the fact that, even with the aid of modern means of calculation, it is virtually impossible to predetermine the optimum operating conditions mathematically, and that consequently the final tuning of an engine is the subject of procedures of trial and error which have to take account of many factors which cannot be reduced to a simple mathematical model.
  • Figure 9 illustrates, by way of example, the timing of the valves in conventional internal combustion engines and in internal combustion engines according to the first and second embodiments of the present invention.
  • Line I shows the timing sequence for a conventional engine.
  • the lines II show in heavier type the "lifting" of the suction and exhaust valves in a conventional engine.
  • Line III shows the "lifting" of the double- function valve according to the invention, where the loop indicates the openings of the suction and exhaust flap valves.
  • Lines III and IV indicate the operation of the second embodiment of the invention, and line IV indicates the "lifting" of the auxiliary suction valve.
  • the inlet manifold 17' or the inlet manifold 50 may be connected to carburetion or direct injection means which can be actuated separately, depending on whether the engine is to require reduced power or full power, the carburetion thus being optimised in both cases, improving performance and reducing specific rates of consumption.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

La tête de cylindre (6) pour moteurs endothermiques alternatifs comporte au moins une soupape (10) actionnée soit pour l'aspiration soit pour l'échappement et coopérant avec un premier et un deuxième ensembles de soupapes du type à clapet servant de soupapes antiretour ou unidirectionnelles et comportant des clapets souples. Le premier ensemble (19) ne permet l'accès au cylindre qu'aux gaz aspirés, et le deuxième (20) ne permet la décharge vers le collecteur d'échappement qu'aux gaz brûlés. Ladite soupape est constituée d'une soupape à champignon (10) de type sensiblement traditionnel actionnée par un arbre à cames rotatif (14) synchronisé avec l'arbre moteur.
PCT/IT1990/000102 1989-12-22 1990-12-21 Tete de cylindre pour moteurs endothermiques alternatifs munis d'au moins une soupape d'aspiration ou d'echappement WO1991010046A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT04869189A IT1238307B (it) 1989-12-22 1989-12-22 Testata per motori alternativi endotermici munita di almeno una valvola comandata sia per aspirazione sia per scarico.
IT48691A/89 1989-12-22

Publications (1)

Publication Number Publication Date
WO1991010046A1 true WO1991010046A1 (fr) 1991-07-11

Family

ID=11268071

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1990/000102 WO1991010046A1 (fr) 1989-12-22 1990-12-21 Tete de cylindre pour moteurs endothermiques alternatifs munis d'au moins une soupape d'aspiration ou d'echappement

Country Status (2)

Country Link
IT (1) IT1238307B (fr)
WO (1) WO1991010046A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7802552B1 (en) * 2007-04-27 2010-09-28 TSR Technologies, L.L.C. Gas channeling cylinder head assembly
WO2012163310A1 (fr) * 2011-06-03 2012-12-06 Knob Engines S.R.O. Moteur à combustion interne multicylindre utilisant les gaz d'échappement pour accroître le remplissage des cylindres
ES2405283A2 (es) * 2011-11-22 2013-05-30 Universidade De Vigo Sistema de renovación de la carga en motores de combustión interna de 4 tiempos con válvula común y flujo controlado por láminas.
GB2503745A (en) * 2012-07-06 2014-01-08 Ben Luke Kardoosh Hybrid-valve four stroke engine
FR2995006A1 (fr) * 2011-09-16 2014-03-07 Michel Pierre Marie Toulminet Soupapes double fonction, debrayables, pour une cylindree operationnelle variable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992721A (en) * 1933-02-03 1935-02-26 Smith Thomas Noah Valve mechanism for internal combustion engines
US2742028A (en) * 1952-11-28 1956-04-17 Jacob G Robinson Valve mechanism
JPH0665214A (ja) * 1992-06-17 1994-03-08 Bayer Ag 置換された（ベンゾチアゾリル−およびキノキサリル−メトキシ）フエニル−酢酸誘導体類

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992721A (en) * 1933-02-03 1935-02-26 Smith Thomas Noah Valve mechanism for internal combustion engines
US2742028A (en) * 1952-11-28 1956-04-17 Jacob G Robinson Valve mechanism
JPH0665214A (ja) * 1992-06-17 1994-03-08 Bayer Ag 置換された（ベンゾチアゾリル−およびキノキサリル−メトキシ）フエニル−酢酸誘導体類

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 9, no. 202 (M-405)(1925), 20 August 1985; & JP-A-6065214 (MITSUBISHI JIDOSHA KOGYO K.K.) 15 April 1985 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7802552B1 (en) * 2007-04-27 2010-09-28 TSR Technologies, L.L.C. Gas channeling cylinder head assembly
WO2012163310A1 (fr) * 2011-06-03 2012-12-06 Knob Engines S.R.O. Moteur à combustion interne multicylindre utilisant les gaz d'échappement pour accroître le remplissage des cylindres
FR2995006A1 (fr) * 2011-09-16 2014-03-07 Michel Pierre Marie Toulminet Soupapes double fonction, debrayables, pour une cylindree operationnelle variable
ES2405283A2 (es) * 2011-11-22 2013-05-30 Universidade De Vigo Sistema de renovación de la carga en motores de combustión interna de 4 tiempos con válvula común y flujo controlado por láminas.
ES2405283R1 (es) * 2011-11-22 2013-11-18 Univ Vigo Sistema de renovacion de la carga en motores de combustion interna de 4 tiempos con valvula comun y flujo controlado por laminas.
GB2503745A (en) * 2012-07-06 2014-01-08 Ben Luke Kardoosh Hybrid-valve four stroke engine

Also Published As

Publication number Publication date
IT1238307B (it) 1993-07-12
IT8948691A1 (it) 1991-06-22
IT8948691A0 (it) 1989-12-22

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