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WO1993018284A1 - Tete de cylindre pour un moteur a combustion interne - Google Patents

Tete de cylindre pour un moteur a combustion interne Download PDF

Info

Publication number
WO1993018284A1
WO1993018284A1 PCT/EP1992/000502 EP9200502W WO9318284A1 WO 1993018284 A1 WO1993018284 A1 WO 1993018284A1 EP 9200502 W EP9200502 W EP 9200502W WO 9318284 A1 WO9318284 A1 WO 9318284A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder head
valve
head according
plunger
pistons
Prior art date
Application number
PCT/EP1992/000502
Other languages
German (de)
English (en)
Inventor
Volker Hoffmann
Winfried Krebs
Original Assignee
F. Porsche Aktiengesellschaft
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 F. Porsche Aktiengesellschaft filed Critical F. Porsche Aktiengesellschaft
Priority to PCT/EP1992/000502 priority Critical patent/WO1993018284A1/fr
Publication of WO1993018284A1 publication Critical patent/WO1993018284A1/fr

Links

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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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
    • F01L1/267—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 means for varying the timing or the lift of the valves

Definitions

  • the invention relates to a cylinder head for an internal combustion engine according to the preamble of patent claim 1.
  • the invention has for its object to provide a cylinder head for an internal combustion engine, the gas exchange valves actuated by a camshaft with the interposition of a tappet can optionally be switched on or off hydraulically.
  • Slidable plungers are arranged in the cylinder head, the plunger being arranged in the plunger radially by means of pressure oil into an inner, first position and activating the slide valve, and the plunger is in positive engagement with a valve stem with the interposition of the slide valve .
  • the gate valves are when switched off Gas exchange entil arranged in an outer second position, the tappet is freely displaceable relative to the valve stem.
  • This arrangement advantageously allows a gas exchange valve to be switched off, e.g. in a first operating state with low load and switching on e.g. high load. This makes it possible to influence fuel consumption and exhaust gas emission in a favorable manner.
  • the integration of the locking slide into a cup-shaped tappet largely leaves the cylinder head in its known design.
  • a supply line for pressure oil to each receptacle of a tappet is usually present in internal combustion engines with cup tappets with integrated hydraulic play compensation.
  • the tappet according to the invention has essentially the same external dimensions as known cup tappets.
  • the pistons are provided with blocking elements in the form of a segment of a circle, which, in the first position, permit the positive engagement between the tappet and the valve on an area large enough for the forces to be transmitted, and in the second position, due to their shape, a space for receiving the valve stem between leave yourself.
  • the pistons are reset when the oil pressure drops, using leaf springs that connect opposite ends of the locking elements.
  • a hydraulic valve lash adjuster can also be integrated, with further bores branching off from the longitudinal bores receiving the pistons and supplying an oil cushion formed between the bottom of the tappet and a sealing plate inserted therein.
  • this arrangement can be used for the temporary decommissioning of one or more cylinders.
  • Fig.l shows a section through a cylinder head with a switched off
  • Gas exchange valve, Figure 2 shows a section through a cylinder head with an activated
  • FIG. 3 shows a section along the line III-III according to Fig.l
  • FIG. 5 shows a section through a variant of the invention.
  • a cylinder head 1 of an internal combustion engine has an overhead camshaft 2 with cams 3 and a cylindrical receptacle 4 for a tappet tappet 5.
  • a circumferential oil groove 6 is arranged in the receptacle 4, into which an oil-carrying feed line 7 opens.
  • the plunger 5 has a pot 8, the bottom 10 of which, provided with a spacer 9, faces the cam 3.
  • a wall 11 of the pot 8 has two radially inwardly facing, opposing ribs 12, into each of which a continuous longitudinal bore 13 is made.
  • radially displaceable pistons 14 are used as locking slides, each of which has a locking element 15 in the form of a segment of a circle at its inner end.
  • a helical spring 17 is supported, which at the other end engages a spring plate 18 of a gas exchange valve 19.
  • a valve stem 20 has a cap 21 at its end projecting into the pot 8.
  • outer ends 22 of opposing locking elements 15 are connected to a leaf spring 23.
  • the supply line 7 is pressurized in a manner not shown, which acts on the piston 14 via the oil groove 6. These are moved radially against the force of the leaf springs 23 into an inner position until the ends 22 of one locking element 15 according to FIG. 4 come to rest with those of the other locking element 15.
  • Base circle runs on the spacer 9.
  • a variant of the invention according to FIG. 5 has an integrated hydraulic valve lash adjuster.
  • two stepped bores 26 opening into the longitudinal bores 13 are made in the bottom 10, each of which receives a valve ball 27 with a return spring 28.
  • These springs 28 are supported on disks 30 inserted into an upper side 29 of the base 10.
  • An oil cushion is formed between the base 10 and the spacer 9 designed as a sealing plate.
  • Gas exchange valve 19 switching position of the locking element 15, gives the Piston 14 the connection of bore 26 and longitudinal bore 13 free.
  • the pressure oil supplied via the oil groove 6 lifts the valve ball 21 out of its seat when required and supplements the oil cushion or maintains it.
  • the piston 14 prevents the oil supply into the bore 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Afin de mettre, de façon sélective, hydrauliquement en ou hors circuit une soupape (19) commandée par came dans une tête de cylindre (1), des pistons (14) munis d'éléments de blocage (15) sont montés, de façon qu'ils puissent être déplacés radialement par huile sous pression, dans un poussoir (5) en forme de coupelle. Lorsque la soupape est hydrauliquement mise en circuit (19) les éléments de blocage (15) sont poussés vers l'intérieur et relient par liaison de forme un fond (10) du poussoir (5) avec un capuchon (21) de la soupape (19). Pour des moteurs à combustion interne comprenant par exemple deux soupapes d'admission par cylindre, le procédé permet, en fonction des besoins, de mettre hydrauliquement en ou hors circuit, une de ces soupapes d'admission.
PCT/EP1992/000502 1992-03-06 1992-03-06 Tete de cylindre pour un moteur a combustion interne WO1993018284A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1992/000502 WO1993018284A1 (fr) 1992-03-06 1992-03-06 Tete de cylindre pour un moteur a combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1992/000502 WO1993018284A1 (fr) 1992-03-06 1992-03-06 Tete de cylindre pour un moteur a combustion interne

Publications (1)

Publication Number Publication Date
WO1993018284A1 true WO1993018284A1 (fr) 1993-09-16

Family

ID=8165643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/000502 WO1993018284A1 (fr) 1992-03-06 1992-03-06 Tete de cylindre pour un moteur a combustion interne

Country Status (1)

Country Link
WO (1) WO1993018284A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995030081A1 (fr) * 1994-05-03 1995-11-09 Lotus Cars Limited Mecanisme de commande de soupapes
DE19540133A1 (de) * 1994-10-27 1996-05-02 Unisia Jecs Corp Ventilstößel
EP0717173A1 (fr) 1994-12-15 1996-06-19 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Poussoir pour une soupape débrayable d'un moteur à combustion interne
US5544628A (en) * 1994-07-06 1996-08-13 Volkswagen Ag Valve control arrangement for an internal combustion engine
US5558052A (en) * 1994-02-18 1996-09-24 Dr. Ing. H.C.F. Porsche Ag Internal-combustion engine switchable valve tappet
WO1997026446A1 (fr) * 1996-01-18 1997-07-24 INA Wälzlager Schaeffler oHG Poussoir pour mecanisme de distribution d'un moteur a combustion interne
US6076491A (en) * 1994-05-03 2000-06-20 Lotus Cars Limited Valve control mechanism
FR2976971A1 (fr) * 2011-06-27 2012-12-28 Valeo Sys Controle Moteur Sas Dispositif d'actionnement de soupape d'un moteur a combustion interne
EP2905437A3 (fr) * 2013-12-11 2016-02-10 Pierburg GmbH Système de transmission pour une commande de soupape pouvant être commandée mécaniquement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952037A1 (de) * 1979-12-22 1981-06-25 Audi Nsu Auto Union Ag, 7107 Neckarsulm Vorrichtung zum abschalten von hubventilen einer brennkraftmaschine
FR2512107A3 (fr) * 1981-09-02 1983-03-04 Riv Officine Di Villar Perosa Poussoir hydraulique a compensation automatique de jeu pour moteurs endothermiques
US5090364A (en) * 1990-12-14 1992-02-25 General Motors Corporation Two-step valve operating mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952037A1 (de) * 1979-12-22 1981-06-25 Audi Nsu Auto Union Ag, 7107 Neckarsulm Vorrichtung zum abschalten von hubventilen einer brennkraftmaschine
FR2512107A3 (fr) * 1981-09-02 1983-03-04 Riv Officine Di Villar Perosa Poussoir hydraulique a compensation automatique de jeu pour moteurs endothermiques
US5090364A (en) * 1990-12-14 1992-02-25 General Motors Corporation Two-step valve operating mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 304 (M-526)16. Oktober 1986 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5558052A (en) * 1994-02-18 1996-09-24 Dr. Ing. H.C.F. Porsche Ag Internal-combustion engine switchable valve tappet
US6076491A (en) * 1994-05-03 2000-06-20 Lotus Cars Limited Valve control mechanism
WO1995030081A1 (fr) * 1994-05-03 1995-11-09 Lotus Cars Limited Mecanisme de commande de soupapes
US5544628A (en) * 1994-07-06 1996-08-13 Volkswagen Ag Valve control arrangement for an internal combustion engine
DE19522720B4 (de) * 1994-07-06 2006-04-13 Volkswagen Ag Ventiltrieb einer Brennkraftmaschine
DE19540133A1 (de) * 1994-10-27 1996-05-02 Unisia Jecs Corp Ventilstößel
DE19540133C2 (de) * 1994-10-27 1998-03-19 Unisia Jecs Corp Ventilstößel
US5743226A (en) * 1994-10-27 1998-04-28 Unisia Jecs Corporation Valve lifter
EP0717173A1 (fr) 1994-12-15 1996-06-19 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Poussoir pour une soupape débrayable d'un moteur à combustion interne
US5603293A (en) * 1994-12-15 1997-02-18 Dr. Ing. H.C.F. Porsche Ag Tappet for a switchable valve of an internal combustion engine
WO1997026446A1 (fr) * 1996-01-18 1997-07-24 INA Wälzlager Schaeffler oHG Poussoir pour mecanisme de distribution d'un moteur a combustion interne
US6053133A (en) * 1996-01-18 2000-04-25 Ina Walzlager Schaeffler Ohg Tappet for an internal combustion engine valve drive
FR2976971A1 (fr) * 2011-06-27 2012-12-28 Valeo Sys Controle Moteur Sas Dispositif d'actionnement de soupape d'un moteur a combustion interne
WO2013001234A3 (fr) * 2011-06-27 2013-03-28 Valeo Systemes De Controle Moteur Dispositif d'actionnement de soupape d'un moteur a combustion interne
EP2905437A3 (fr) * 2013-12-11 2016-02-10 Pierburg GmbH Système de transmission pour une commande de soupape pouvant être commandée mécaniquement

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