WO2018133906A1 - Actionneur de cames coulissantes pour système de cames coulissantes - Google Patents

Actionneur de cames coulissantes pour système de cames coulissantes Download PDF

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Publication number
WO2018133906A1
WO2018133906A1 PCT/DE2018/100044 DE2018100044W WO2018133906A1 WO 2018133906 A1 WO2018133906 A1 WO 2018133906A1 DE 2018100044 W DE2018100044 W DE 2018100044W WO 2018133906 A1 WO2018133906 A1 WO 2018133906A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
pin
sliding cam
displacement
sliding
Prior art date
Application number
PCT/DE2018/100044
Other languages
German (de)
English (en)
Inventor
Harald Elendt
Claudia Zielinski
Original Assignee
Schaeffler Technologies AG & 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 & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2018133906A1 publication Critical patent/WO2018133906A1/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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead 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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0047—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • 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
    • F01L2013/10—Auxiliary actuators for variable valve timing
    • F01L2013/101—Electromagnets

Definitions

  • the invention relates to a sliding cam actuator for a sliding cam system. Furthermore, the invention also relates to a sliding cam system with a Schiebeno ckenaktuator and at least one camshaft on which at least one sliding cam with a sliding groove is displaceably arranged but non-rotatably.
  • the actuator can also be used for other applications, preferably for actuating a hydraulic central valve for a phaser.
  • the invention extends to internal combustion engines for motor vehicles, in particular for passenger cars, trucks and motorcycles.
  • variable valve trains are preferably used, in which both the valve lift, the valve opening period and the phase angle of the camshaft relative to the crankshaft can be adjusted.
  • an optimization of the charge exchange can be carried out taking into account the respective operating state of the internal combustion engine.
  • the fuel consumption and, on the other hand, the exhaust gas values of the internal combustion engine can be improved.
  • An adjustment of the valve lift and the valve opening duration can be achieved inter alia by means of switchable cam followers, ie by means of switchable bucket tappets, drag levers or rocker arms, for which purpose the cam followers are selectively actuated via different cams with different cam strokes and cam contours.
  • valve drives with cam switches for gas exchange valves of an internal combustion engine are known from the prior art.
  • DE 10 2004 008 670 A1 discloses a valve drive with cam switching.
  • the valve train comprises a splined shaft with external axial teeth and a cam piece per cylinder with internal teeth, by which the cam piece is axially displaceable and rotationally fixed to the part shaft, wherein the cam piece per gas exchange valve two having adjacent cams with the same base circle diameter and uneven stroke, and wherein at both ends of the cam piece cylindrical end pieces are provided, in each of whose circumference a mirror-symmetrical sliding groove is incorporated radially.
  • each displacement groove is a radially retractable, housing-fixed actuator pin, which by interaction of actuator pins and sliding the cam piece axially back and forth is pushed with the engine running, the sliding grooves have an acceleration edge with an impact ramp whose constant, low slope a correspondingly constant, low caused axial initial speeds of the cam piece and a small impact force of the actuator pins.
  • a corresponding mode of action is considered to be generic.
  • the object of the present invention is to further develop a sliding cam actuator for a sliding cam system, wherein in particular simplifies the construction and the production costs are reduced.
  • the sliding cam actuator according to the invention for a sliding cam system has a housing in which an actuator pin is arranged, and a component receiving the housing, in which a displacement pin is arranged, wherein the actuator pin is provided for actuating the displacement pin and at least partially comes to rest on the displacement pin in order, upon actuation of the actuator pin, to extend the displacement pin axially out of the component accommodating the housing and to immerse it in a sliding groove of a sliding cam.
  • the displacement pin is to be understood as meaning an actuator which can be displaced axially back and forth by an adjoining actuator.
  • the actuator pin is to be understood as meaning an actuator which acts on an actuator when actuated by an actuating device.
  • the displacement pin and the actuator pin are preferably pin-shaped. The separation of the shift pin for displacement of the cam piece and the actuator atorpins to shift the shift pin allows several advantages. For example, only the displacement pin receives transverse forces which are introduced by the displacement of the cam piece, the transverse forces being transmitted to the receiving component. The actuator pin experiences no transverse force load.
  • the displacement pin is axially movably received in a guide, wherein the guide is substantially provided to receive transverse forces of the Verschiebepins.
  • the guide is integrated in the receiving component and provided for sliding bearing. The guide supports and thus guides the displacement pin in the axial direction.
  • the receiving component may be a cylinder head or cylinder head cover, which is particularly well suited for the support of the transverse forces due to its properties.
  • a compression spring acts axially on the shift pin to hold the shift pin out of the shift groove of the shift cam in an unactuated state of the actuator pin.
  • the Aktuatorpin counteracts the spring force on the sliding pin to move it axially from the housing receiving the component in the sliding groove of the sliding cam.
  • the compression spring is arranged axially between the displacement pin and the guide.
  • the displacement pin preferably has a radial expression, on which the compression spring can come to rest axially.
  • the actuator pin is electromagnetically actuated.
  • a coil means is provided in the housing of the actuator comprising a core of a magnetic material and a coil enclosing the core.
  • the core is integrated in the actuator pin or at least connected to the actuator pin.
  • the Aktuatorpin is acted upon by energizing the coil with an actuating force and moved axially in the direction of the shift pin.
  • the invention also relates to a sliding cam system with at least one camshaft, on which at least one sliding cam with a sliding groove is arranged displaceably but non-rotatably, wherein a displacement pin of a sliding cam actuator engages in the displacement groove of the sliding cam.
  • the sliding cam actuator may be provided for other applications.
  • the sliding cam actuator may be used as an actuator for operating a central valve, the actuator having a housing in which an actuator pin is disposed, and a housing receiving member in which a shift pin is disposed, the actuator pin being provided for operating the shift pin and at least partially comes to the shift pin to the plant to extend the shift pin axially from the housing receiving component upon actuation of the actuator pins.
  • Figure 1 is a schematic sectional view for illustrating the construction of a sliding cam system according to the invention.
  • Figure 2 is a schematic perspective view for illustrating the
  • a sliding cam system according to the invention for a - not shown here - internal combustion engine a Schiebenockenaktua- tor 1 and a camshaft 9, on which a sliding cam 6 with a sliding groove 5 slidably but rotatably disposed.
  • the sliding cam actuator 1 comprises a housing 2, in which an actuator pin 4 is arranged, and a component 10 accommodating the housing, in which a displacement pin 3 is arranged.
  • the female housing 10 is the cylinder head or cylinder head cover of an internal combustion engine.
  • the actuator pin 4 is provided for actuating the displacement pin 3 and comes to rest against the displacement pin 3 in order to extend the displacement pin 3 axially out of the housing 2 receiving component 10 during actuation of the actuator pin 4 and to dive into the displacement groove 5 of the sliding cam 6 ,
  • the actuator pin 4 is electromagnetically actuated.
  • a compression spring 8 acts axially on the sliding pin 3 to keep the sliding pin 3 out of the sliding groove 5 of the sliding cam 6 in an unactuated state of the actuator pin 4.
  • the displacement pin 3 is accommodated axially movably in a guide 7 on the component 2 accommodating the housing 2, wherein the guide 7 is essentially provided for absorbing transverse forces of the displacement pin 3.
  • the compression spring 8 is arranged axially between the displacement pin 3 and the guide 7.

Landscapes

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

Abstract

L'invention concerne un actionneur (1) de cames coulissantes pour un système de cames coulissantes. L'actionneur comprend un boîtier (2) dans lequel est agencée une broche (4) d'actionneur, et un élément (10) qui loge le boîtier et dans lequel est agencée une broche (3) coulissante. La broche (4) d'actionneur sert à actionner la broche (3) coulissante et vient au moins en partie en appui contre la broche (3) coulissante, afin, lors d'un actionnement de la broche (4) d'actionneur, de faire sortir axialement la broche (3) coulissante de l'élément (10) logeant le boîtier et de l'enfoncer dans une rainure (5) de coulissement d'une came (6) coulissante. En outre, l'invention concerne également un système de cames coulissantes comprenant un actionneur (1) de came coulissante et au moins un arbre (9) à cames, sur lequel au moins une came (6) coulissante présentant une rainure (5) de coulissement est montée coulissante mais solidaire en rotation.
PCT/DE2018/100044 2017-01-23 2018-01-22 Actionneur de cames coulissantes pour système de cames coulissantes WO2018133906A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017101158.7 2017-01-23
DE102017101158 2017-01-23

Publications (1)

Publication Number Publication Date
WO2018133906A1 true WO2018133906A1 (fr) 2018-07-26

Family

ID=61148156

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2018/100044 WO2018133906A1 (fr) 2017-01-23 2018-01-22 Actionneur de cames coulissantes pour système de cames coulissantes

Country Status (2)

Country Link
DE (1) DE102018101012A1 (fr)
WO (1) WO2018133906A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008670A1 (de) 2004-02-21 2005-09-08 Ina-Schaeffler Kg Ventiltrieb mit Nockenumschaltung für die Gaswechselventile eines 4-Takt-Verbrennungsmotors
DE102011011803A1 (de) * 2011-02-19 2012-08-23 Volkswagen Ag Betätigungsmodul für mindestens ein Gaswechselventil einer Brennkraftmaschine
DE102014212997A1 (de) * 2014-07-04 2015-11-05 Schaeffler Technologies AG & Co. KG Ventiltrieb für eine Brennkraftmaschine, sowie Verfahren zur Ermittlung einer aktuellen Axialposition eines Nockenträgers auf einer Grundnockenwelle eines Ventiltriebs
DE102014109619A1 (de) * 2014-07-09 2016-01-14 Kendrion (Villingen) Gmbh Stellvorrichtung
US20160090875A1 (en) * 2014-09-30 2016-03-31 Hyundai Motor Company Variable valve lift apparatus
DE102014220266A1 (de) * 2014-10-07 2016-04-07 Schaeffler Technologies AG & Co. KG Aktorvorrichtung mit Hülsenabstützung an einer Brennkraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008670A1 (de) 2004-02-21 2005-09-08 Ina-Schaeffler Kg Ventiltrieb mit Nockenumschaltung für die Gaswechselventile eines 4-Takt-Verbrennungsmotors
DE102011011803A1 (de) * 2011-02-19 2012-08-23 Volkswagen Ag Betätigungsmodul für mindestens ein Gaswechselventil einer Brennkraftmaschine
DE102014212997A1 (de) * 2014-07-04 2015-11-05 Schaeffler Technologies AG & Co. KG Ventiltrieb für eine Brennkraftmaschine, sowie Verfahren zur Ermittlung einer aktuellen Axialposition eines Nockenträgers auf einer Grundnockenwelle eines Ventiltriebs
DE102014109619A1 (de) * 2014-07-09 2016-01-14 Kendrion (Villingen) Gmbh Stellvorrichtung
US20160090875A1 (en) * 2014-09-30 2016-03-31 Hyundai Motor Company Variable valve lift apparatus
DE102014220266A1 (de) * 2014-10-07 2016-04-07 Schaeffler Technologies AG & Co. KG Aktorvorrichtung mit Hülsenabstützung an einer Brennkraftmaschine

Also Published As

Publication number Publication date
DE102018101012A1 (de) 2018-07-26

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