EP3523512A1 - Unité hydraulique pour un moteur à combustion interne à commande hydraulique variable des soupapes d'échange des gaz - Google Patents

Unité hydraulique pour un moteur à combustion interne à commande hydraulique variable des soupapes d'échange des gaz

Info

Publication number
EP3523512A1
EP3523512A1 EP17784837.1A EP17784837A EP3523512A1 EP 3523512 A1 EP3523512 A1 EP 3523512A1 EP 17784837 A EP17784837 A EP 17784837A EP 3523512 A1 EP3523512 A1 EP 3523512A1
Authority
EP
European Patent Office
Prior art keywords
housing
hydraulic
channel
pressure chamber
venting
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
EP17784837.1A
Other languages
German (de)
English (en)
Other versions
EP3523512B1 (fr
Inventor
Lothar Von Schimonsky
Nicola Morelli
Steffen Pfeiffer
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP3523512A1 publication Critical patent/EP3523512A1/fr
Application granted granted Critical
Publication of EP3523512B1 publication Critical patent/EP3523512B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
    • F01L9/14—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem the volume of the chamber being variable, e.g. for varying the lift or the timing of a valve
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column

Definitions

  • Hydraulic unit for an internal combustion engine with hydraulically variable gas exchange valve drive
  • the invention relates to a hydraulic unit for an internal combustion engine with hydraulically variable gas exchange valve train.
  • the hydraulic unit comprises:
  • the vent channel is inside the housing connected via a throttle point with the pressure relief chamber and opens outside the housing.
  • DE 10 2013 213 695 A1 discloses a hydraulic unit of a fully variable hydraulic valve control.
  • the hydraulic unit is mounted on the cylinder head of an internal combustion engine, and their hydraulic chambers vent - in the direction of gravity - down into the cylinder head.
  • the operational venting of the hydraulic system causes the entrained air bubbles carried by the hydraulic fluid from the interior to the environment of the hydraulic housing and thus prevents air from entering and remaining in the pressure chamber in an excessive amount, wherein the required for the hydraulic gas exchange valve actuation rigidity of the hydraulic fluid at an unallowable level would be impaired.
  • the vent also promotes the leakage of hydraulic fluid from the hydraulic housing when the engine is turned off.
  • the present invention has the object of developing a hydraulic unit of the type mentioned in such a way that the hydraulic leakage from the hydraulic housing is reduced to such an extent that the hydraulic fluid in the pressure chamber even after a long period of inactivity of the internal combustion engine a critical for their startup level not below.
  • the venting channel should have a siphon with a respective first channel section leading downwards with respect to the directions of gravity and the venting direction and with a second channel section leading upwards.
  • the bottom section of the siphon runs with the gas exchange valve closed below the boundary of the pressure chamber from the slave piston.
  • the siphon has two functions: First, it forms with the up leading second channel section, a hydraulic reservoir which is filled at the time the engine is shut down with hydraulic fluid and then the cooling-induced shrinkage of the hydraulic fluid in the hydraulic chambers - depending on the volume of the reservoir - partially or completely compensated.
  • the falling level in the second channel section causes a shortening (via the communicating tubes) of the hydraulic or oil column bearing on the slave piston, so that the low pressure in the pressure chamber ideally completely prevents its leakage.
  • the dimensioning of the venting channel which determines the volume of the hydraulic reservoir can also be relevant for the state in which the level in the lowermost section of the siphon drops to such an extent that it is not possible to avoid sucking back air via the first channel section. It is only from a minimum size of the channel cross section that air bubbles can rise without displacing the overlying oil column in front of it and displacing it into the pressure relief space. Since the sucked-back air bubbles rise through the oil column standing in the first passage section and virtually reclose, the leakage-inhibiting negative pressure in the hydraulic housing is maintained.
  • two slave pistons 8 are guided per cylinder, which drive the gas exchange valves 2 on the outside of the housing and bound the common pressure chamber 5 on the housing side.
  • an electromagnetic hydraulic valve 9 in this case a normally open 2-2-way valve interrupts in the closed state, the connection between the pressure relief chamber 6 and the pressure chamber 5.
  • a piston accumulator 10 is connected to receive the displaced hydraulic fluid.
  • the pressure relief chambers 6 are connected via a hydraulic connection, not shown, on the hydraulic housing 4 to the hydraulic circuit, ie the oil circuit of the internal combustion engine.

Landscapes

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

Abstract

L'invention concerne une unité hydraulique pour un moteur à combustion interne à commande hydraulique variable des soupapes d'échange des gaz, comprenant : - un boîtier hydraulique (4) pourvu d'une chambre de pression (5), d'une chambre de détente (6) et d'un canal de purge (11, 11'), la chambre de pression, la chambre de détente et le canal de purge étant reliés hydrauliquement les uns aux autres, - un piston émetteur (7) guidé dans le boîtier hydraulique, qui est entraîné par une came (3) côté extérieur du boîtier et qui délimite la chambre de pression côté intérieur du boîtier, - un piston récepteur (8) guidé dans le boîtier hydraulique, qui entraîne la soupape d'échange des gaz (2) côté extérieur du boîtier et qui délimite la chambre de pression côté intérieur du boîtier, - et une vanne hydraulique (9) qui, à l'état fermé, coupe la liaison entre la chambre de détente et la chambre de pression. Le canal de purge est relié, côté intérieur du boîtier, à la chambre de détente par l'intermédiaire d'un point d'étranglement (12) et débouche du côté extérieur du boîtier. Le canal de purge comporte un siphon comprenant une première partie de canal descendante par rapport au sens de la gravité et à la direction de purge et une seconde partie de canal montante, la partie (17) du siphon située la plus en bas s'étendant en-dessous de la délimitation (13) de la chambre de pression par le piston récepteur lorsque la soupape d'échange des gaz est fermée.
EP17784837.1A 2016-10-05 2017-09-29 Unité hydraulique pour moteur à combustion interne comprenant une commande hydraulique variable de soupape Active EP3523512B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016219297.3A DE102016219297B4 (de) 2016-10-05 2016-10-05 Hydraulikeinheit für eine Brennkraftmaschine mit hydraulisch variablem Gaswechselventiltrieb
PCT/DE2017/100833 WO2018065010A1 (fr) 2016-10-05 2017-09-29 Unité hydraulique pour un moteur à combustion interne à commande hydraulique variable des soupapes d'échange des gaz

Publications (2)

Publication Number Publication Date
EP3523512A1 true EP3523512A1 (fr) 2019-08-14
EP3523512B1 EP3523512B1 (fr) 2020-11-11

Family

ID=60119759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17784837.1A Active EP3523512B1 (fr) 2016-10-05 2017-09-29 Unité hydraulique pour moteur à combustion interne comprenant une commande hydraulique variable de soupape

Country Status (5)

Country Link
US (1) US11187117B2 (fr)
EP (1) EP3523512B1 (fr)
CN (1) CN109790766B (fr)
DE (1) DE102016219297B4 (fr)
WO (1) WO2018065010A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111546119A (zh) * 2020-04-28 2020-08-18 东莞市固达机械制造有限公司 数控双换台精密平面铣床

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB501738A (en) * 1936-09-02 1939-02-28 Schweizerische Lokomotiv Improvements in or relating to hydraulic telemotor systems
FR1459833A (fr) * 1965-07-19 1966-06-17 Hispano Suiza Sa Perfectionnements apportés aux moteurs à combustion interne à soupapes, notammentaux moteurs diesel de ce type
DE2840445C2 (de) * 1978-09-16 1984-10-04 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Hydraulische Vorrichtung zum Betätigen eines Gaswechselventils für Brennkraftmaschinen
DE3939066A1 (de) * 1989-11-25 1991-05-29 Bosch Gmbh Robert Elektrohydraulische ventilsteuervorrichtung fuer brennkraftmaschinen
US5537976A (en) * 1995-08-08 1996-07-23 Diesel Engine Retarders, Inc. Four-cycle internal combustion engines with two-cycle compression release braking
EP0843779B1 (fr) * 1995-08-08 2001-02-28 Diesel Engine Retarders, Inc. Un systeme de frein moteur par decompression pour moteur a combustion interne
ITTO20010269A1 (it) 2001-03-23 2002-09-23 Fiat Ricerche Motore a combustione interna, con sistema idraulico di azionamento variabile delle valvole, e mezzi di compensazione delle variazioni di vol
DE10310298A1 (de) * 2003-03-10 2004-09-23 Robert Bosch Gmbh Vorrichtung zur Steuerung mindestens eines Öffnungsquerschnitts in einem Verbrennungszylinder einer Brennkraftmaschine
EP1623100A4 (fr) * 2003-05-06 2008-11-26 Jacobs Vehicle Systems Inc Systeme et procede permettant d'ameliorer les performances d'un systeme d'actionnement hydraulique
US7059283B2 (en) * 2003-12-18 2006-06-13 Olivetti Gian M System and method of retaining hydraulic fluid in a hydraulic valve actuation system
DE602004005600T2 (de) * 2004-10-28 2007-12-27 C.R.F. S.C.P.A. Brennkraftmaschine mit einer elektronischen Steuerung für eine Hydraulikvorrichtung zur variablen Betätigung von Einla ventilen
JP4983444B2 (ja) * 2007-07-06 2012-07-25 トヨタ自動車株式会社 ラッシュアジャスタの作動油供給構造及び内燃機関
DE102007054376A1 (de) 2007-11-14 2009-05-20 Schaeffler Kg Hydraulikeinheit für einen Zylinderkopf einer Brennkraftmaschine mit hydraulisch variablem Ventiltrieb
DE602008002915D1 (de) 2008-06-25 2010-11-18 Fiat Ricerche Verbrennungsmotor, insbesondere Zwei-Zylinder-Motor mit einem vereinfachten System zur verstellbaren Betätigung der Motorventile
WO2010129872A1 (fr) * 2009-05-07 2010-11-11 Scuderi Group, Llc Admission d'air pour composants d'un moteur à division du cycle
EP2261471B1 (fr) * 2009-05-25 2014-09-17 C.R.F. Società Consortile per Azioni Moteur à combustion interne avec deux soupapes d'admission hydrauliques avec des ressorts différents pour chaque cylindre
DE102010018209A1 (de) * 2010-04-26 2011-10-27 Schaeffler Technologies Gmbh & Co. Kg Hydraulikeinheit für einen Zylinderkopf einer Brennkraftmaschine mit hydraulisch variablem Gaswechselventiltrieb
EP2653703B1 (fr) * 2012-04-19 2014-04-30 C.R.F. Società Consortile per Azioni Moteur à combustion interne avec cylindres qui peuvent être désactivés, les cylindres désactivés sont utilisés comme pompes pour récirculer le gas d'échappement dans les cylindres actives et un procédé pour contrôler ce moteur
DE102013213695A1 (de) 2013-07-12 2015-01-15 Schaeffler Technologies Gmbh & Co. Kg Vorrichtung zum Entlüften von Hohlräumen

Also Published As

Publication number Publication date
DE102016219297A1 (de) 2018-04-05
US20210293162A1 (en) 2021-09-23
US11187117B2 (en) 2021-11-30
CN109790766B (zh) 2021-01-26
WO2018065010A1 (fr) 2018-04-12
EP3523512B1 (fr) 2020-11-11
DE102016219297B4 (de) 2021-12-30
CN109790766A (zh) 2019-05-21

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