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WO2008138583A1 - Dispositif d'actionnement de soupape d'échange gazeux à force de rappel réglable - Google Patents

Dispositif d'actionnement de soupape d'échange gazeux à force de rappel réglable Download PDF

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Publication number
WO2008138583A1
WO2008138583A1 PCT/EP2008/003802 EP2008003802W WO2008138583A1 WO 2008138583 A1 WO2008138583 A1 WO 2008138583A1 EP 2008003802 W EP2008003802 W EP 2008003802W WO 2008138583 A1 WO2008138583 A1 WO 2008138583A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
gas exchange
exchange valve
spring
actuating device
Prior art date
Application number
PCT/EP2008/003802
Other languages
German (de)
English (en)
Inventor
Marcus Hergert
Marc Oliver Wagner
Harry Wolf
Original Assignee
Daimler 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 Daimler Ag filed Critical Daimler Ag
Publication of WO2008138583A1 publication Critical patent/WO2008138583A1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements
    • 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
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • 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

Definitions

  • the invention relates to a Gas batventilbetlists- device according to the preamble of patent claim 1.
  • Gas exchange valve actuation devices which have a spring unit and a brake unit.
  • the spring unit is intended to close a valve and keep it closed until it is reopened by a camshaft.
  • the invention is in particular the object of providing a brake unit with improved braking performance.
  • the object is achieved in each case by the features of the independent claims, wherein further embodiments of the invention can be taken from the subclaims.
  • the invention relates to a Gas batventilbetuschists- device with a spring unit and a brake unit.
  • the brake unit has a unit which is provided to adjust a spring force of the spring unit.
  • setting is intended in particular a lowering and / or increasing the spring force of the spring unit, preferably in a closed state a gas exchange valve to be understood.
  • a “braking unit” is to be understood as a unit which uses the energy losses occurring through a targeted gas exchange valve control to achieve a braking power.
  • the spring force of the spring unit can be adjusted and increased in particular in a braking operation, so that at high pressures in an exhaust system, the gas exchange valve can be kept securely closed. Pressure reductions or pressure limitations in the exhaust system can be avoided and it can be a high braking performance while maintaining advantageous limits, as they apply outside of a braking operation can be achieved.
  • limit values are meant in particular limit values of the gas exchange valve actuating device, such as nozzle nozzle temperature, valve forces, Hertzian pressures and / or valve attachment speeds.
  • the adjustment of the spring force of the spring unit can be effected by means of various mechanisms, in particular by means of actuators considered appropriate by those skilled in the art, wherein in a design by means of a hydraulic actuator, a structurally particularly simple solution can be achieved.
  • the spring unit serves as a reset unit of the hydraulic actuator, whereby additional components, space, weight and assembly costs can be saved.
  • the unit comprises a pressure intensifier designed to amplify an operating medium pressure in the unit, whereby desired Operating medium pressures in the unit, in particular in the hyd ⁇ raulischen actuator, can be easily achieved.
  • the unit has a Nachdirä, which is intended to track operating means, whereby advantageously a leakage can be compensated continuously.
  • the Nachschtician may be formed by a separate unit or advantageously at least partially integral with the pressure booster, whereby additional components, space, weight and assembly costs can be saved.
  • the unit comprise a stop means intended to limit a setting path of the unit and / or a pressure relief valve intended to limit an operating medium pressure in the unit.
  • a defined adjustment range can be easily achieved by appropriate means.
  • the unit comprises a check valve disposed in a resource supply channel of the unit, which opens up further possibilities for setting the unit.
  • the unit is provided to adjust the spring force of the spring unit depending on at least one operating parameter, in particular depending on an operating parameter, which is formed by an engine speed and / or an engine oil pressure.
  • an operating parameter which is formed by an engine speed and / or an engine oil pressure.
  • the spring unit comprises at least two spring means, whereby an increased adjustment can be achieved.
  • a spring force of at least one spring means is independent of the unit. This allows further adjustment options for the spring unit can be achieved.
  • the brake unit preferably has at least one switching means which is provided for activating the unit.
  • the spring force of the spring unit can advantageously be selectively adjusted for at least one braking operation, wherein "for" means in particular before and / or during a braking operation, so that at least in a braking operation another spring force of the spring unit is present as outside the braking operation Loading in particular of the unit and / or the spring unit can be achieved.
  • the gas exchange valve actuating device comprises a valve clearance compensation unit. It is particularly advantageous if the valve clearance compensation unit is designed as a hydraulic unit.
  • a "hydraulic valve clearance compensation unit” is to be understood as a unit which has, in particular, a piston and a cylinder unit and which is preferably designed to be self-regulating. Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The description and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
  • Fig. 3 spring characteristics over a valve.
  • FIG. 1 shows a detail of a gas exchange valve actuating device outside a braking operation.
  • the gas exchange valve actuating device comprises a spring unit 10 with a spring means 20 formed by a helical compression spring and a brake unit 11.
  • the brake unit 11 comprises a control unit 26, a cam follower unit 27 and a unit 12, which is provided to a spring force of the spring unit 10 and that of To adjust spring means 20.
  • the unit 12 comprises a hydraulic actuator 13, which is supplied via a pressure booster 14 with resources.
  • the pressure booster is formed integrally with a Nachför- derü 15, which tracks in case of leakage resources.
  • the hydraulic actuator 13 comprises an actuator piston 23, which is arranged in a cylinder head of an internal combustion engine and whose setting path is limited by a stop means 16 is.
  • the limitation of an operating medium pressure in a working fluid pressure chamber 24 of the hydraulic actuator 13 he follows ⁇ by a pressure relief valve 17th
  • the brake unit 11 comprises a switching means 22, the unit 12 is activated in egg ⁇ nem braking operation, ie the operating medium-pressure chamber 24 is filled ⁇ with a resource ge and the actuator piston 23 moves against the spring force of the spring unit 10, whereby the spring force of the spring unit 10 is increased to a gas exchange valve 25.
  • the spring means 20 is supported at a first end on the actuator piston 23. With a second end, the spring means 20 is supported on a spring plate which is fixed to a shaft 28 of the gas exchange valve 25.
  • the unit 12 may include a check valve 18 disposed in a resource supply passage 19 of the unit 12 and preventing operating fluid from flowing back toward the switching means 22. This creates a parallel to the spring characteristic A shifted spring characteristic R ( Figure 3). As a result of different operating medium pressures in the operating medium pressure space 24, the unit 12 can set more than two spring settings of the spring unit 10. The adjustment of the actuator piston 23 is given by the resource pressure and leads to different spring characteristics of the spring unit 10, not shown.
  • the unit 12 adjusts the spring force of the spring means 20 depending on an operating parameter.
  • This operating parameter is formed by an engine oil pressure.
  • the operating medium pressure of the hydraulic actuator 13 is set via this operating parameter.
  • other operating parameters which appear reasonable to the person skilled in the art can also be used, such as, in particular, an operating parameter formed by an engine speed.
  • the spring unit 10 consists of a spring means 20 whose spring force is adjusted via the unit 12.
  • the spring unit 10 may also comprise two spring means 20, 21, wherein it is then provided that a spring force of the spring means 21 is independent of the unit 12, as indicated in FIG.
  • a conventional hydraulic valve play compensation unit 29 is arranged with a piston and cylinder unit not shown in detail, which compensates a valve clearance of the gas exchange valve 25 itself regulating.

Landscapes

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

Abstract

La présente invention concerne un dispositif d'actionnement de soupape d'échange gazeux comprenant une unité de rappel (10) et une unité de freinage (11). Selon l'invention, l'unité de freinage (11) présente une unité qui est conçue pour régler une force de rappel de l'unité de rappel (10).
PCT/EP2008/003802 2007-05-15 2008-05-10 Dispositif d'actionnement de soupape d'échange gazeux à force de rappel réglable WO2008138583A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007022652A DE102007022652A1 (de) 2007-05-15 2007-05-15 Gaswechselventilbetätigungsvorrichtung
DE102007022652.9 2007-05-15

Publications (1)

Publication Number Publication Date
WO2008138583A1 true WO2008138583A1 (fr) 2008-11-20

Family

ID=39708354

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/003802 WO2008138583A1 (fr) 2007-05-15 2008-05-10 Dispositif d'actionnement de soupape d'échange gazeux à force de rappel réglable

Country Status (2)

Country Link
DE (1) DE102007022652A1 (fr)
WO (1) WO2008138583A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613484A1 (de) * 1976-03-30 1977-10-06 Daimler Benz Ag Ventilsteuerung fuer brennkraftmaschinen
DE3529767A1 (de) * 1975-09-06 1987-02-26 Kloeckner Humboldt Deutz Ag Motorbremsvorrichtung fuer eine brennkraftmaschine
DE3529768A1 (de) * 1985-08-20 1987-02-26 Kloeckner Humboldt Deutz Ag Brennkraftmaschine mit einer abgasbremse
DE3800945C1 (fr) * 1988-01-15 1989-02-16 Daimler-Benz Ag, 7000 Stuttgart, De
FR2711394A1 (fr) * 1993-10-19 1995-04-28 Leonard Andre Frein moteur à haute pression.
DE19531872A1 (de) * 1995-08-30 1996-10-02 Daimler Benz Ag Brennkraftmaschine mit einer Motorbremseinrichtung
US20020035978A1 (en) * 1998-04-03 2002-03-28 Usko James N. Hydraulic lash adjuster with compression release brake
DE10155106A1 (de) * 2001-11-09 2003-05-22 Bayerische Motoren Werke Ag Ventiltrieb für eine Brennkraftmaschine
US20050217619A1 (en) * 2004-03-17 2005-10-06 Patrice Martinez Valve return device, and an engine equipped with such a device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3529767A1 (de) * 1975-09-06 1987-02-26 Kloeckner Humboldt Deutz Ag Motorbremsvorrichtung fuer eine brennkraftmaschine
DE2613484A1 (de) * 1976-03-30 1977-10-06 Daimler Benz Ag Ventilsteuerung fuer brennkraftmaschinen
DE3529768A1 (de) * 1985-08-20 1987-02-26 Kloeckner Humboldt Deutz Ag Brennkraftmaschine mit einer abgasbremse
DE3800945C1 (fr) * 1988-01-15 1989-02-16 Daimler-Benz Ag, 7000 Stuttgart, De
FR2711394A1 (fr) * 1993-10-19 1995-04-28 Leonard Andre Frein moteur à haute pression.
DE19531872A1 (de) * 1995-08-30 1996-10-02 Daimler Benz Ag Brennkraftmaschine mit einer Motorbremseinrichtung
US20020035978A1 (en) * 1998-04-03 2002-03-28 Usko James N. Hydraulic lash adjuster with compression release brake
DE10155106A1 (de) * 2001-11-09 2003-05-22 Bayerische Motoren Werke Ag Ventiltrieb für eine Brennkraftmaschine
US20050217619A1 (en) * 2004-03-17 2005-10-06 Patrice Martinez Valve return device, and an engine equipped with such a device

Also Published As

Publication number Publication date
DE102007022652A1 (de) 2008-11-20

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