EP0545979B1 - Hydraulischer ventilstössel für eine brennkraftmaschine - Google Patents

Hydraulischer ventilstössel für eine brennkraftmaschine Download PDF

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Publication number
EP0545979B1
EP0545979B1 EP91914827A EP91914827A EP0545979B1 EP 0545979 B1 EP0545979 B1 EP 0545979B1 EP 91914827 A EP91914827 A EP 91914827A EP 91914827 A EP91914827 A EP 91914827A EP 0545979 B1 EP0545979 B1 EP 0545979B1
Authority
EP
European Patent Office
Prior art keywords
valve
housing
tappet
pressure valve
liquid
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.)
Expired - Lifetime
Application number
EP91914827A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0545979A1 (de
Inventor
Donatus Wichelhaus
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche 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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0545979A1 publication Critical patent/EP0545979A1/de
Application granted granted Critical
Publication of EP0545979B1 publication Critical patent/EP0545979B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length
    • 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
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S137/00—Fluid handling
    • Y10S137/909—Magnetic fluid valve

Definitions

  • Such tappets are used to transmit the forces acting between the camshaft and the intake and exhaust valves.
  • cup-shaped valve lifters that are slidably mounted in the cylinder head between cams and valves are often used. These are generally connected to the lubricating oil circuit and bring about a hydraulic valve lash compensation, which makes maintenance work in this regard superfluous, e.g. B. known from DE-37 24 655.
  • a cam-operated valve lifter which influences the valve lift by means of a hydraulic device, is, for. B. disclosed in DE-36 25 627.
  • a hydraulic valve with an electrorheological or electroviscous fluid is known, which can also be used in the valve train of an internal combustion engine.
  • a cylindrical housing is mounted in a receptacle, in which a piston connected to the gas exchange valve and a high-pressure valve are guided.
  • a changeable working space is formed between the high pressure valve and the piston, which is filled with the electrorheological or electroviscous liquid.
  • the piston of the valve is connected to the cam of the camshaft via a tappet base, the tappet base with the subsequent piston being able to dip into the cylindrical housing.
  • the object underlying the invention is to provide a hydraulic valve tappet and a cylinder head with such a tappet for an internal combustion engine, with which the valve lift can be varied during the operation of the internal combustion engine.
  • the displaced liquid is displaced into a compensation space formed between the high pressure valve and a housing base, on which the cam acts, so that the liquid remains inside the valve tappet; their volume is therefore small.
  • the viscosity is changed to "liquid” and a spring arranged between the housing base and a sealing disk covering the compensation space pushes the liquid back through the high-pressure valve into the working space.
  • the remaining of the liquid inside the valve tappet avoids the problems that usually occur with oil-hydraulic tappets caused by foamed oil, such as e.g. B. rammers and the resulting noise that pretend a knock control combustion noise at or above the knock limit.
  • the necessary electronic voltage is transmitted without contact by induction windings inserted in the valve tappet housing and a tappet guide.
  • An electronic control device controls the electrical voltage and thus the valve lift. Due to the Oppermann effect, the tappet is self-regulating, since when the liquid is displaced by the cylinder shells, a voltage which is dependent on the displacement speed is induced and which forwards the current valve lift to the circuit.
  • optimal valve lifts are stored in the control device in characteristic maps. Thus, depending on the parameter, a z. B. for minimum pollutant emissions or maximum performance optimal valve lift can be realized.
  • the control can be carried out individually for each gas exchange valve.
  • the two valves can be opened one after the other with a different stroke with a different phase.
  • one of the two intake valves can be switched off in which the displacement of the piston in the housing is chosen to be as large as the maximum cam stroke and the viscosity is set to "rigid" at the point of the maximum cam stroke.
  • the tappet 4 has a cup-shaped housing 6 with a housing base 7 which is in direct contact with a cam 8 of a camshaft, which is only indicated.
  • a pin 12 connected on one side to the bottom 7 and separated by a step 9 into two sections 10, 11.
  • Between the first section 10 and the Housing 6 extends radially with a sealing washer 14 inserted with two sealing rings 13 and axially displaceable on the pin 12. It is acted upon on one side by a plate spring 15 which is supported on the base 7.
  • a rigid hydraulic high pressure valve 20 which has no moving parts and which bears against the step 9 and a corresponding stop 21 in the housing 6.
  • the upper and lower sides 22 and 23 of the valve 20 are each delimited by a valve plate 24. Axial displacements of the valve 20 are prevented by securing rings 25 fixed on the pin 12 and in the housing 6.
  • the control device 36 comprises a high-voltage module 37, which is controlled, among other things, by characteristic diagrams K. Voltage values UH, which correspond to a specific valve lift H, are stored in these characteristic maps K as a function of load L, speed n and oil temperature T ⁇ l of the internal combustion engine.
  • the high-voltage module 37 supplies an output voltage UA to the induction winding 35 of the tappet guide 3.
  • the bucket tappet 4 is moved back and forth in the fixed tappet guide 3 by the rotating cam 8 or by a valve spring (not shown). This movement induces a voltage UI in the induction winding 32, which is applied to the cylinder shells 28 via the connections 33.
  • the liquid F is guided helically along the insulator bridges 30 through the flow channels 29.
  • This helical course extends the path by which the liquid F is displaced in the flow channels 29 and, together with a relatively rough surface of the cylinder shells 28, thereby increases the adhesion of the liquid F and thus the transferable force.
  • the insulator bridges 30 run steeper with increasing radius of the cylinder shells 28.
  • the current sensed by the current measuring resistor 40 during the displacement of the piston 26 deviates from the current IS flowing in the case of a rigid liquid, since the electrical conductivity of the liquid F depends on its flow rate in the high-pressure valve 20. With the change in current, the voltage UA detected by the voltage measuring resistor 38 changes. If the comparator 41 then reports that the voltage UA corresponds to the desired voltage UAS required for the desired valve stroke H, the displacement of the piston 26 is terminated in that the high-voltage module 37 supplies an output voltage UA which allows the liquid F to solidify again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP91914827A 1990-08-31 1991-08-16 Hydraulischer ventilstössel für eine brennkraftmaschine Expired - Lifetime EP0545979B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4027630 1990-08-31
DE4027630A DE4027630C1 (enrdf_load_stackoverflow) 1990-08-31 1990-08-31
PCT/EP1991/001554 WO1992004531A1 (de) 1990-08-31 1991-08-16 Hydraulischer ventilstössel für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0545979A1 EP0545979A1 (de) 1993-06-16
EP0545979B1 true EP0545979B1 (de) 1996-01-24

Family

ID=6413341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91914827A Expired - Lifetime EP0545979B1 (de) 1990-08-31 1991-08-16 Hydraulischer ventilstössel für eine brennkraftmaschine

Country Status (5)

Country Link
US (1) US5315961A (enrdf_load_stackoverflow)
EP (1) EP0545979B1 (enrdf_load_stackoverflow)
JP (1) JPH06500376A (enrdf_load_stackoverflow)
DE (2) DE4027630C1 (enrdf_load_stackoverflow)
WO (1) WO1992004531A1 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2710106B1 (fr) * 1993-09-13 1995-12-08 Melchior Jean F Perfectionnement aux moteurs a combustion interne
US6637387B1 (en) 2002-09-13 2003-10-28 General Motor Corporation Variable valve actuating mechanism with magnetorheological fluid lost motion device
US20040055549A1 (en) * 2002-09-25 2004-03-25 Petrie Tad L. Variable valve timing system for an internal combustion engine
EP1411211B1 (de) * 2002-10-17 2007-01-10 Ford Global Technologies, LLC Ventileinrichtung für ein Kraftfahrzeug
DE102006056841A1 (de) * 2006-12-01 2008-06-05 Robert Bosch Gmbh Brennkraftmaschine
ITCT20080015A1 (it) * 2008-11-04 2010-05-04 Matteo Maio Sincronizzatore coassiale attuato elettromagneticamente
WO2011084866A2 (en) 2010-01-07 2011-07-14 Dresser-Rand Company Exhaust catalyst pre-heating system and method
US8973613B2 (en) * 2011-04-27 2015-03-10 Google Inc. Electrorheological valve
DE102011075043B4 (de) * 2011-05-02 2023-04-13 Schaeffler Technologies AG & Co. KG Dichtung für Schaltventile
US9441753B2 (en) 2013-04-30 2016-09-13 Boston Dynamics Printed circuit board electrorheological fluid valve
CN107869368A (zh) * 2016-09-27 2018-04-03 浙江师范大学 一种压电驱动的液压式无凸轮轴气门驱动机构
DE102019123891B4 (de) * 2019-09-05 2022-12-01 Rolls-Royce Solutions GmbH Ventilaktor, Ventilaktorsystem mit einem Ventil und dem Ventilaktor, Brennkraftmaschine und Verfahren zum Betreiben des Ventilaktorsystems in einer Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930463A (en) * 1989-04-18 1990-06-05 Hare Sr Nicholas S Electro-rheological valve control mechanism

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3511819A1 (de) * 1985-03-30 1986-10-09 Robert Bosch Gmbh, 7000 Stuttgart Ventilsteuervorrichtung
DE3609861A1 (de) * 1986-03-22 1987-09-24 Bayer Ag Sensorgesteuertes hydraulisches system mit elektroviskosen fluessigkeiten
GB2189086A (en) * 1986-04-09 1987-10-14 Ford Motor Co Camshaft drive
DE3625627A1 (de) * 1986-07-29 1988-02-04 Bayerische Motoren Werke Ag Vorrichtung zur hydraulischen steuerung von hubventilen
DE3718393A1 (de) * 1987-06-02 1988-08-11 Bayerische Motoren Werke Ag Hydraulisches ausgleichselement fuer gaswechselventile von brennkraftmaschinen
DE3724655A1 (de) * 1987-07-25 1988-08-04 Daimler Benz Ag Hydraulisches ventilspielausgleichselement
US4840112A (en) * 1988-01-12 1989-06-20 Ga Technologies Inc. Combined valve/cylinder using electro-rheological fluid
US5161653A (en) * 1989-04-18 1992-11-10 Hare Sr Nicholas S Electro-rheological shock absorber
US5014829A (en) * 1989-04-18 1991-05-14 Hare Sr Nicholas S Electro-rheological shock absorber
US5158109A (en) * 1989-04-18 1992-10-27 Hare Sr Nicholas S Electro-rheological valve
US5103779A (en) * 1989-04-18 1992-04-14 Hare Sr Nicholas S Electro-rheological valve control mechanism
US5099884A (en) * 1991-05-24 1992-03-31 Ntn Technical Center (U.S.A.), Inc. Electrorheological fluid plate valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930463A (en) * 1989-04-18 1990-06-05 Hare Sr Nicholas S Electro-rheological valve control mechanism

Also Published As

Publication number Publication date
US5315961A (en) 1994-05-31
DE59107319D1 (de) 1996-03-07
WO1992004531A1 (de) 1992-03-19
DE4027630C1 (enrdf_load_stackoverflow) 1991-12-05
JPH06500376A (ja) 1994-01-13
EP0545979A1 (de) 1993-06-16

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