EP1831507A1 - Mecanisme de commande de soupape variable de moteur a combustion interne - Google Patents

Mecanisme de commande de soupape variable de moteur a combustion interne

Info

Publication number
EP1831507A1
EP1831507A1 EP05792392A EP05792392A EP1831507A1 EP 1831507 A1 EP1831507 A1 EP 1831507A1 EP 05792392 A EP05792392 A EP 05792392A EP 05792392 A EP05792392 A EP 05792392A EP 1831507 A1 EP1831507 A1 EP 1831507A1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
hydraulic
internal combustion
combustion engine
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
EP05792392A
Other languages
German (de)
English (en)
Other versions
EP1831507B1 (fr
Inventor
Volker Schmidt
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 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 KG filed Critical Schaeffler KG
Publication of EP1831507A1 publication Critical patent/EP1831507A1/fr
Application granted granted Critical
Publication of EP1831507B1 publication Critical patent/EP1831507B1/fr
Expired - Fee Related 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
    • 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
    • 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
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to a variable valve train of an internal combustion engine for actuating a gas exchange valve. Its movement follows a stroke of a cam and a stroke of the cam superimposed and independent of the stroke of the cam stroke of a piston of a hydraulic Kraftaufbring ⁇ device.
  • This is connected to a hydraulic medium line with adjustable hydraulic medium pressure and has a pressure chamber acting upon the piston as well as a hydraulic valve clearance compensation device with a work space radially delimited by a housing.
  • DE 43 18 293 A1 discloses a hydraulic force application device on a drag lever drive with a pivot bearing, the one of a
  • Cam operated drag lever pivotally supports in the direction of actuation of the gas exchange valve.
  • the hydraulic force application device expands the functionality of a hydraulic valve lash adjuster by a hydraulic stroke, which is variably adjustable and is superimposed on the predetermined by the cam mechanical stroke on the gas exchange valve.
  • this superimposition reduces the gas exchange valve lift with regard to the maximum stroke and / or opening duration up to the complete stop of the gas exchange valve.
  • the overlapping of the hydraulic and the mechanical stroke also makes it possible to expand the stroke generated by the cam in terms of an earlier opening time or a later closing time or an increased maximum travel or combinations.
  • the present invention is therefore the object of a valvetrain of the type mentioned in such a way that the disadvantages are avoided.
  • the hydraulic force application device should therefore be distinguished firstly by minimal space requirement and thus also be usable in modern space-constrained internal combustion engines.
  • their moving components should have the lowest possible mass in order to be able to actuate the gas exchange valve with the highest possible acceleration values.
  • the force application device should be able to be produced as inexpensively as possible with low complexity.
  • the housing also serves to radially limit the pressure chamber.
  • the hydraulic force application device is thus designed such that the working space of the hydraulic valve clearance compensation device and the pressure chamber are radially bounded by a common housing. This eliminates the need for a separate outer housing, the wall thickness would lead to a significant increase in diameter and length of the force application device. Their minimal space requirement thus enables an excellent adaptability of the valve drive according to the invention in already existing internal combustion engines. At the same time, cost-effective manufacturability is given by the low complexity of the hydraulic force application device.
  • the mass of the moving components is low, so that good acceleration values can be achieved when the gas exchange valve is actuated.
  • the expenditure for generating the hydraulic drive power can be maintained at a low level with regard to a good efficiency of the internal combustion engine.
  • a particularly advantageous embodiment of the valve train according to the invention provides according to claim 2, that the pressure chamber of the piston and a piston facing the first end side of a longitudinally movably guided in the housing compensating piston of the hydraulic valve play compensation device is axially limited.
  • the working space of the hydraulic valve clearance compensation device is arranged separately from the pressure chamber and is axially bounded by a second end face of the balance piston facing away from the piston.
  • the fact that the working space is not extended by the volume of the hydraulic medium line, results in an excellent rigidity of the hydraulic valve lash adjuster.
  • proven components of conventional high-volume technology can be used. Thus, it is possible, for example, to continue to use the return spring of the hydraulic valve lash adjuster which is designed for the comparatively small stroke of the balance piston.
  • the pressure chamber is identical to the working chamber of the hydraulic valve compensation device.
  • the piston can be used as a large-volume hydraulic fluid reservoir for supplying the working space of the hydraulic valve clearance compensation device.
  • it can be advantageous in terms of manufacturing technology to produce the piston in one piece together with the compensation piston.
  • the hydraulic valve clearance compensation device is connected to an independent of the hydraulic medium line hydraulic fluid supply according to claim 5.
  • Such a division of the hydraulic supply is in particular Petrovanes Ltd if not every gas exchange valve of the internal combustion engine is additionally actuated by a hydraulic force application device and a hydraulic fluid supply already exists anyway for the supply of adjacent, and exclusively cam-actuated valve trains.
  • the valve train should allow at least one secondary stroke of the gas exchange valve during a lift-free base circle phase of the cam according to claim 6. This results in advantageous ways to recirculate exhaust gas in high volumes and precisely adjustable dosage internally.
  • This form of exhaust gas recirculation is in particular the basis for operation of the internal combustion engine with homogeneous and self-igniting charge.
  • HCCI Homogeneous Charge Compression Ignition
  • HCCI Homogeneous Charge Compression Ignition
  • the combustion process in the HCCI process is essentially determined by controlling the charge composition and the charge temperature profile.
  • a very effective means for increasing the charge temperature is the increase of the residual gas content, ie the increase of the content of not flushed or flushed and recirculated into the cylinder exhaust gas of the previous combustion cycle in the cylinder charge for the next combustion cycle.
  • the residual gas content on the operating point of the internal combustion engine must be fully variable, with residual gas quantities of 60% of the cylinder charge and more may be required. Residual gas components can no longer be provided at this altitude via internal exhaust gas recirculation by conventional valve overlap or via a device for external exhaust gas recirculation.
  • the HCCI process with unacceptable combustion processes is extremely sensitive to changes in the charge shadow, so that in addition to the provision of residual gas in the required Men ⁇ ge also a Verbrennungszyklustreue, high-precision and zylinderindividuel ⁇ le dosage of the residual gas content is required.
  • the secondary stroke is carried out according to claim 7, preferably on an outlet valve.
  • exhaust gas which has already been ejected into the exhaust passage is sucked back into the combustion chamber via the then opened exhaust valve during the intake stroke of the internal combustion engine.
  • the valve train according to the invention as an engine brake, in particular for air-compressing internal combustion engines, for safety-relevant supplementation of the service brake.
  • engine brakes are usually used as a continuous brake in commercial vehicles and are based on the principle that the Schlepp ⁇ moment of the in-overrun and not fired internal combustion engine by increasing the charge exchange work can be significantly increased and the vehicle is braked.
  • the exhaust valve is opened again during the compression phase, so that the cylinder charge is not compressed gas-spring-like, but is pushed into the outlet channel by applying Ausschiebearbeit.
  • exhaust gas recirculation it may also be expedient, according to claim 8, for the secondary stroke to take place at an inlet valve.
  • exhaust gas is expelled into the intake passage in the exhaust stroke of the internal combustion engine when the intake valve is again opened and sucked back into the combustion chamber during the intake stroke.
  • valve train is proposed in claim 9, wherein the valve drive as a drag lever drive and the hydraulic Kraftauf ⁇ bring Rhein are designed as a pivot bearing.
  • the lubricating oil of the internal combustion engine is used according to claim 10 for the sake of simplicity. Conversely, however, it is also conceivable to use any other suitable fluids in a hydraulic fluid circuit which would then have to be separated from the lubricating oil circuit of the internal combustion engine.
  • valve drive according to the invention is illustrated by way of example with reference to a drag lever drive with two differently designed pivot bearings of the hydraulic force application device. Show it:
  • FIG. 1 shows the drag lever drive with the gas exchange valve closed, with a first longitudinally cut pivot bearing
  • FIG. 2 shows an enlarged view of the pivot bearing according to FIG. 1,
  • FIG. 3 shows the drag lever drive with the gas exchange valve closed, with a second longitudinally cut pivot bearing
  • Figure 4 is an enlarged view of the pivot bearing according to
  • FIG. 3 Detailed description of the drawings
  • valve drive 1 is disclosed on the example of a drag lever drive 2 with a pivot bearing 3a as part of a hydraulic force application device 4a.
  • a gas exchange valve 5 which is actuated by a cam follower 6 by a cam 7 in the opening direction.
  • the drag lever 6 is mounted on the pivot bearing 3a in the direction of actuation of the gas exchange valve 5 and has a rotatably mounted roller 8 as low-friction contact surface 9 to the cam 7.
  • the cam 7 has a cam elevation phase 10, which generates a hub on Gas ⁇ exchange valve 5, and a stroke-free base circle phase 11.
  • a piston 14 with an outer circumferential surface 15 and a compensating piston 16 with an outer circumferential surface 17 are longitudinally movably guided.
  • a first end portion 18 of the piston 14 is a first end face 19 of the balance piston 16 zu ⁇ turned, while a second end portion 20 of the piston 14 is designed to schwenk ⁇ movable mounting of the finger lever 6 spherical.
  • a second, the piston 14 facing away from end face 21 of the balance piston 16 defines a working space 22a of a hydraulic valve play compensation device 23a.
  • the piston 14 is spaced apart from the first end face 19 of the compensating piston 16 and delimits, together with the latter, a pressure chamber 24a of the hydraulic force application device 4a that is variable in volume.
  • the valve lash adjuster 23a communicates with a hydraulic fluid supply "S-LA".
  • the compensating piston 16 is expediently designed as a hollow body 25 in order to separate the pressure chamber 24a from the working chamber 22a of the valve lash adjuster 23a and at the same time to create a hydraulic fluid reservoir 26 for the working chamber 22a.
  • the pressure chamber 24a is connected via at least one passage opening 27 in the housing 13a to a hydraulic fluid line "SP", whose hydraulic fluid pressure is adjustable.
  • the pivot bearing 3a assumes a basic position "A", in which the piston 14 rests with its first end section 18 on the first end face 19 of the compensating piston 16.
  • the gas exchange valve 5 is closed, since at the same time the cam 7 rests with its base circle phase 11 on the roller 8.
  • the hydraulic force application device 4a generates a stroke of the gas exchange valve 5 superimposed on the stroke of the nozzle 7, in that the volume of the pressure chamber 24a is increased by increasing the hydraulic fluid pressure in the hydraulic transmission line "S-P".
  • the piston 14 is spaced from the balance piston 16 and actuates the drag lever 6 independently of the stroke of the cam 7 in the opening direction of the gas exchange valve 5.
  • This situa ⁇ tion is shown in Fig. 2 for a stroke position "B" of the piston 14.
  • This passage 28 can be configured as an indentation 29 which interrupts an end face 30, which is essentially parallel to the first end face 19 of the compensating piston 16, of the first end section 18 of the piston 14.
  • Figures 3 and 4 disclose the valve gear 1 according to the invention with a pivot bearing 3b, which differs from the pivot bearing 3a of Figures 1 and 2 substantially by the merger of a working chamber 22b of a valve clearance compensation device 23b with a pressure chamber 24b of a hydraulic force application device 4b.
  • the following statements are therefore limited to the representation of the essential differences in characteristics between the two embodiments.
  • the pivot bearing 3b is shown in a basic position "C".
  • the basic position "C” corresponds to a mounting position of the hydraulic valve clearance compensation device 23b and is characterized in that an end face 31 of a piston 32 facing away from the drag lever 6 is slightly spaced from a shoulder 33 of a housing 13b.
  • the piston 32 serves for axially delimiting the work space 22b which is identical to the pressure chamber 24b.
  • the working space 22b is also connected to the hydraulic medium line "S-P" via a passage opening 27 in the housing 14b for the purpose of changing the volume of the pressure chamber 24b.
  • the piston 32 is shown in Figures 3 and 4 as a one-piece piston 32, which also serves for the pivotable mounting of the finger lever 6. Equally, however, the use of a multi-part piston is possible, with an upper part of the drag lever 6 superimposed and a lower part for limiting the working space 22b common pressure chamber 24b is used.
  • the pivot bearing 3b at a stroke position "D" with significantly ver ⁇ insulatedtem distance of the end face 31 of the piston 32 to the shoulder 33 of the Ge housing 13b shown.
  • the hydraulic medium line "SP” is again operated as a drain line.
  • the hydraulic fluid line "SP” is to be closed at the pivot bearing 3b at the latest when the cam elevation phase 11 engages the roller 8, in order to maintain the function of the valve lash adjuster 23b.
  • valve clearance compensation device 23b can finally take place in a known manner via a check valve 34, which connects the hydraulic medium supply "S-LA” independent of the hydraulic medium line "S-P" to the working space 22b.
  • valve train 1 has been explained using the example of a drag lever valve drive 2 as a preferred embodiment.
  • the idea of the invention can equally be implemented in other valve train designs, such as, for example, cup drives or pushrod drives.
  • the scope of the invention should also include valve trains, which are designed to be switchable by means of coupling means, in order to selectively transfer strokes of a plurality of cams as a function of the coupling state to the gas exchange valve 6. This applies equally to valve trains which continuously vary the stroke of the gas exchange valve 6 by means of a cam and further adjusting elements.

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)

Abstract

La présente invention concerne un mécanisme de commande de soupape variable (1) d'un moteur à combustion interne, qui sert à actionner une soupape d'échange gazeux (5). Son mouvement suit la course d'une came (7) et la course d'un piston (14, 32) d'un système d'application de force hydraulique (4a, 4b), qui se superpose à la course de la came (7) et est indépendante de celle-ci. Le système d'application de force hydraulique est relié à une conduite d'agent hydraulique (S-P) à pression d'agent hydraulique réglable, et présente une chambre de pression (24a, 24b) sur laquelle agit le piston (14, 32), et un dispositif d'équilibrage de jeu de soupape hydraulique (23a, 23b) comprenant une chambre de travail (22a, 22b) délimitée d'un point de vue radial par un boîtier (13a, 13b). Selon l'invention, le boîtier (13a, 13b) doit servir dans le même temps à la délimitation radiale de la chambre de pression (24a, 24b).
EP05792392A 2004-11-04 2005-10-12 Mecanisme de commande de soupape variable de moteur a combustion interne Expired - Fee Related EP1831507B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004053203A DE102004053203A1 (de) 2004-11-04 2004-11-04 Variabler Ventiltrieb einer Brennkraftmaschine
PCT/EP2005/010943 WO2006048100A1 (fr) 2004-11-04 2005-10-12 Mecanisme de commande de soupape variable de moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1831507A1 true EP1831507A1 (fr) 2007-09-12
EP1831507B1 EP1831507B1 (fr) 2013-01-02

Family

ID=35482160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05792392A Expired - Fee Related EP1831507B1 (fr) 2004-11-04 2005-10-12 Mecanisme de commande de soupape variable de moteur a combustion interne

Country Status (4)

Country Link
US (1) US7568460B2 (fr)
EP (1) EP1831507B1 (fr)
DE (1) DE102004053203A1 (fr)
WO (1) WO2006048100A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104903552A (zh) * 2013-01-03 2015-09-09 瓦锡兰芬兰有限公司 用于控制排气门的关闭的排气门装置和方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010018208A1 (de) * 2010-04-26 2011-10-27 Schaeffler Technologies Gmbh & Co. Kg Hydraulisches Ventilspiel-Ausgleichselement für Hubkolbenbrennkraftmaschinen
DE102011101239A1 (de) * 2011-05-11 2012-11-15 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Hydrostößel mit einer zweiten Ölzuführung zur

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See references of WO2006048100A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104903552A (zh) * 2013-01-03 2015-09-09 瓦锡兰芬兰有限公司 用于控制排气门的关闭的排气门装置和方法
CN104903552B (zh) * 2013-01-03 2017-11-03 瓦锡兰芬兰有限公司 用于控制排气门的关闭的排气门装置和方法

Also Published As

Publication number Publication date
US20080115749A1 (en) 2008-05-22
US7568460B2 (en) 2009-08-04
EP1831507B1 (fr) 2013-01-02
DE102004053203A1 (de) 2006-06-01
WO2006048100A1 (fr) 2006-05-11

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