EP1022444A3 - Hydraulically controlled valve drive for a multivalve cylinder head - Google Patents

Hydraulically controlled valve drive for a multivalve cylinder head Download PDF

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Publication number
EP1022444A3
EP1022444A3 EP99122366A EP99122366A EP1022444A3 EP 1022444 A3 EP1022444 A3 EP 1022444A3 EP 99122366 A EP99122366 A EP 99122366A EP 99122366 A EP99122366 A EP 99122366A EP 1022444 A3 EP1022444 A3 EP 1022444A3
Authority
EP
European Patent Office
Prior art keywords
valve
piston
oil
cylinder unit
inlet valve
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.)
Granted
Application number
EP99122366A
Other languages
German (de)
French (fr)
Other versions
EP1022444B1 (en
EP1022444A2 (en
Inventor
Heribert Dipl.-Ing. Möller (FH)
Manfred Dipl.-Ing. Pister (Fh)
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
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 MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Publication of EP1022444A2 publication Critical patent/EP1022444A2/en
Publication of EP1022444A3 publication Critical patent/EP1022444A3/en
Application granted granted Critical
Publication of EP1022444B1 publication Critical patent/EP1022444B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat type
    • 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
    • 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

Abstract

Die Erfindung bezieht sich auf eine hydraulisch geregelte, zwangsgesteuerte Ventilhubbetätigung für einen Mehrventilzylinderkopf mit integriertem Ventilspielausgleich. Bei Brennkraftmaschinen mit mehr als einem Einlaßventil besteht bei geringen Drehzahlen das Problem, daß der Drall im Brennraum für eine gute Verbrennung unzureichend ist. Eine Verbesserung wird nur erzielt, wenn im niedrigen Drehzahlbereich nur ein Einlaßventil öffnet, so daß noch eine hinreichende Ansauggeschwindigkeit erzielt wird. Erfindungsgemäß wird dies bei zwei Einlaßventilen dadurch erreicht, daß in die Ventilbrücke 20 ein Massenträgheitsyentil 20a eingebaut wird, welches bei niedriger Drehzahl den Weg des Öls zur Kolben-Zylindereinheit 3b des Einlaßventils 2 sperrt, so daß der Druckraum der Kolben-Zylindereinheit 3b ohne Öl ist und das Einlaßventil 2 nicht öffnet. Der Weg des Öls zur Kolben-Zylindereinheit 3a ist dagegen ständig geöffnet, so daß das Einlaßventil 1 permanent betätigt wird und dort eine entsprechend hohe Einströmgeschwindigkeit auch bei niedriger Drehzahl realisiert wird. Bei steigender Drehzahl nimmt die Beschleunigung der Ventilbrücke 20 und des damit gekoppelten Massenträgheitsventils 20a zu, bis es gegen die Rückstellkraft einer Druckfeder 24 öffnet und den Weg des Öls über die Bohrung 25 und die Querbohrung 23 zu der Kolben-Zylindereinheit 3b freigibt, so daß auch das Einlaßventil 2 öffnet.

Figure 00000001
The invention relates to a hydraulically controlled, positively controlled valve lift actuation for a multi-valve cylinder head with integrated valve clearance compensation. In internal combustion engines with more than one inlet valve, there is the problem at low speeds that the swirl in the combustion chamber is insufficient for good combustion. An improvement is only achieved if only one inlet valve opens in the low speed range, so that a sufficient intake speed is still achieved. According to the invention, this is achieved with two intake valves by installing a mass inertia valve 20a in the valve bridge 20, which at low speed blocks the path of the oil to the piston-cylinder unit 3b of the intake valve 2, so that the pressure chamber of the piston-cylinder unit 3b is without oil and the inlet valve 2 does not open. The path of the oil to the piston-cylinder unit 3a, on the other hand, is constantly open, so that the inlet valve 1 is permanently actuated and a correspondingly high inflow speed is realized there even at a low speed. With increasing speed, the acceleration of the valve bridge 20 and the mass inertia valve 20a coupled therewith increases until it opens against the restoring force of a compression spring 24 and releases the path of the oil via the bore 25 and the transverse bore 23 to the piston-cylinder unit 3b, so that also inlet valve 2 opens.
Figure 00000001
EP99122366A 1998-12-17 1999-11-10 Hydraulically controlled valve drive for a multivalve cylinder head Expired - Lifetime EP1022444B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19858213A DE19858213A1 (en) 1998-12-17 1998-12-17 Hydraulic valve operating system for cylinder head with integrated play leveling, in which valve bridge has mass inertia valve
DE19858213 1998-12-17

Publications (3)

Publication Number Publication Date
EP1022444A2 EP1022444A2 (en) 2000-07-26
EP1022444A3 true EP1022444A3 (en) 2001-01-31
EP1022444B1 EP1022444B1 (en) 2003-04-16

Family

ID=7891390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122366A Expired - Lifetime EP1022444B1 (en) 1998-12-17 1999-11-10 Hydraulically controlled valve drive for a multivalve cylinder head

Country Status (2)

Country Link
EP (1) EP1022444B1 (en)
DE (2) DE19858213A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102140945B (en) 2004-03-15 2014-03-12 雅各布斯车辆系统公司 Valve bridge with integrated lost motion system
CN102787919B (en) 2011-05-18 2015-03-04 上海尤顺汽车部件有限公司 Method and device for braking reset rocking arm
US9523291B2 (en) 2015-03-18 2016-12-20 Caterpillar Inc. Valve actuation system having rocker-located hydraulic reservoir
CN106089348B (en) * 2016-08-23 2018-10-16 潍柴动力股份有限公司 A kind of air valve bridge and the engine including the air valve bridge
EP3498989A1 (en) * 2017-12-14 2019-06-19 Innio Jenbacher GmbH & Co OG Valve train for an internal combustion engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133332A (en) * 1977-10-13 1979-01-09 The Torrington Company Valve control mechanism
US4475497A (en) * 1981-11-04 1984-10-09 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine having an intake/exhaust valve assembly and hydraulic means for rendering the valve assembly inoperative
US4593662A (en) * 1984-10-20 1986-06-10 Mtu Friedrichshafen Gmbh Valve control of a supercharged four-cycle internal combustion engine
JPS61164009A (en) * 1985-01-14 1986-07-24 Toyota Motor Corp Low noise and high output operated tappet valve system
US4759321A (en) * 1985-06-24 1988-07-26 Nissan Motor Co., Ltd. Valve timing arrangement for internal combustion engine having multiple inlet valves per cylinder
EP0803642A1 (en) * 1996-04-24 1997-10-29 C.R.F. Società Consortile per Azioni Internal combustion engine with variably actuated valves

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503145B1 (en) * 1991-03-13 1994-08-24 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Lifter arrangement for driving at least two poppet valves
ES2116123T3 (en) * 1995-04-04 1998-07-01 Steyr Nutzfahrzeuge PROCEDURE FOR MOTOR BRAKING WITH A FOUR-STROKE INTERNAL COMBUSTION ENGINE.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133332A (en) * 1977-10-13 1979-01-09 The Torrington Company Valve control mechanism
US4475497A (en) * 1981-11-04 1984-10-09 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine having an intake/exhaust valve assembly and hydraulic means for rendering the valve assembly inoperative
US4593662A (en) * 1984-10-20 1986-06-10 Mtu Friedrichshafen Gmbh Valve control of a supercharged four-cycle internal combustion engine
JPS61164009A (en) * 1985-01-14 1986-07-24 Toyota Motor Corp Low noise and high output operated tappet valve system
US4759321A (en) * 1985-06-24 1988-07-26 Nissan Motor Co., Ltd. Valve timing arrangement for internal combustion engine having multiple inlet valves per cylinder
EP0803642A1 (en) * 1996-04-24 1997-10-29 C.R.F. Società Consortile per Azioni Internal combustion engine with variably actuated valves

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 368 (M - 543) 9 December 1986 (1986-12-09) *

Also Published As

Publication number Publication date
DE19858213A1 (en) 2000-06-21
EP1022444B1 (en) 2003-04-16
EP1022444A2 (en) 2000-07-26
DE59905064D1 (en) 2003-05-22

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