EP0911492A1 - Dispositif pour modifier la phase angulaire d'un arbre à cames de moteur à combustion interne - Google Patents

Dispositif pour modifier la phase angulaire d'un arbre à cames de moteur à combustion interne Download PDF

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Publication number
EP0911492A1
EP0911492A1 EP98890293A EP98890293A EP0911492A1 EP 0911492 A1 EP0911492 A1 EP 0911492A1 EP 98890293 A EP98890293 A EP 98890293A EP 98890293 A EP98890293 A EP 98890293A EP 0911492 A1 EP0911492 A1 EP 0911492A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
drive
pump
pump part
housing
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
EP98890293A
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German (de)
English (en)
Other versions
EP0911492B1 (fr
Inventor
Siegfried Heer
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.)
TCG Unitech AG
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TCG Unitech AG
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Publication date
Application filed by TCG Unitech AG filed Critical TCG Unitech AG
Publication of EP0911492A1 publication Critical patent/EP0911492A1/fr
Application granted granted Critical
Publication of EP0911492B1 publication Critical patent/EP0911492B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • 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
    • Y10T74/2102—Adjustable

Definitions

  • the invention relates to a device for adjusting a camshaft of an internal combustion engine with internal combustion in relation to the drive wheel driving it, with a hydraulic adjustment element, on the one hand with a component supporting the drive wheel and on the other hand in connection with a component which is firmly connected to the camshaft stands.
  • the camshaft of an internal combustion engine is usually driven by a sprocket is connected to the crankshaft via a drive chain, or one designed as a pulley Drive wheel, which is connected to the crankshaft via a toothed belt, driven.
  • Adjustment devices are known from DE 41 10 088 C1 and from DE 39 29 619 A1, where between a component connected to the camshaft and a an adjusting element is provided with the drive wheel in connection with the component has two helical gears with the corresponding gears of the camshaft or the drive wheel are engaged.
  • an axial displacement of this adjustment element can cause the camshaft to rotate relative to the drive wheel.
  • One possibility of the axial displacement of the adjusting element is the actuation by a hydraulic piston that is activated depending on the required adjustment.
  • an electrical adjustment device is known from DE 41 01 676 A1, in which a Electric motor is provided, which moves the adjusting element via a thread play.
  • the adjusting element rotates essentially at the camshaft speed, between the electric motor and the adjusting element, an axial thrust bearing can be provided absorbs the relative movement between the fixed component and the rotating component.
  • This thrust bearing is in the known solution practically throughout Engine operation is loaded because of the torsional moments acting between the drive wheel and the camshaft always exerted a force acting in the axial direction on the adjusting element becomes. This thrust bearing is therefore a critical part of the life of the engine restricted.
  • the object of the present invention is to avoid the disadvantages and a simple, to create reliable and compact device for adjusting the camshaft. In particular the adjustment should be possible with a minimal supply of external energy.
  • the hydraulic adjusting element a hydraulic pump part driven by the drive wheel and a hydraulic one has driven by the pump part, connected to the camshaft drive part, wherein the output side of the pump part is fluidly connected to the input side of the drive part is and the flow rate and / or the pressure of the pumped to the driving part Working fluid is controllable.
  • the relative rotation of the camshaft in relation to the drive wheel is done by the work given by the driving part to the camshaft, whereby the driving part is driven hydraulically by a working fluid conveyed by the pump part.
  • the pump part is driven via the camshaft's gear wheel.
  • the pump part and the drive part are designed as displacement machines.
  • the pump part and the drive part are designed as fluid machines.
  • both the pump part and the drive part are each one to the camshaft axis Coaxial vane impeller rotatable in a preferably common housing. This enables a very compact, reliable design, with the vane impellers can be arranged side by side in the axial direction.
  • a particularly simple control of the relative rotation of the camshaft with respect to the Driving wheel can be reached when controlling the flow rate and / or the pressure of the working fluid conveyed from the pump part to the driving part by moving the common housing is transverse to the direction of the camshaft axis.
  • By the shift of the housing are the displacement volumes in the pump section and in the drive section enlarged or reduced to each other, causing a phase shift between the Camshaft and the drive wheel is done.
  • the maximum phase shift is determined by limited a rotation stop between the drive wheel and the camshaft.
  • the hydraulic Adjusting element has a housing in which a pump part coaxial with the camshaft Vane impeller is arranged, which is also coaxial with the camshaft vane impeller hydraulically drives as a driving part, the output side of the pump part with the input side of the driving part is connected to the flow, and the flow rate and / or the pressure of the working fluid delivered from the pump part to the driving part is controllable, and that the Control of the flow rate and / or the pressure of the pumped to the driving part Working fluids by rotating the common housing about one to the axis of the Camshaft parallel axis takes place.
  • the twisting can have an effect similar to that of the linear displacement can be achieved.
  • the housing is driven in the direction of rotation easier to display in some cases.
  • the housing Due to the eccentric rotation of the housing about a parallel to the camshaft axis, however, it is arranged at a distance from it that the housing extends along of a circular arc twisted. Depending on the design of the overflow openings, this can be done Be achieved that the torque transmitted from the drive wheel to the camshaft exerts a small moment on the housing to twist it in a certain direction. This effect can be used to increase any frictional forces and moments compensate, or to facilitate the camshaft adjustment in a certain direction and thereby accelerate. If necessary, this effect can be achieved by a spring element, which is designed as a torsion spring, reinforced or weakened.
  • the device according to the invention eliminates the need for adjusting devices acting in the axial direction required helical gearing, which increases the manufacturing costs decreased.
  • the adjustment energy is provided by the camshaft drive itself, whereby external energy sources, such as additional electric motors or hydraulic pumps, are eliminated.
  • the adjustment can be controlled mechanically using the simplest means, for example or electrically, with extremely small adjustment forces.
  • Another advantage is that the Adjustment device universally used for motors of different sizes and performance can be. This significantly reduces the manufacturing effort.
  • a camshaft 1 is partially shown schematically. About an oil supply 2, a bore 3 inside the camshaft 1 is supplied with lubricating oil.
  • a drive wheel 4 is fixed in the axial direction but rotatably on the camshaft 1, the drive wheel 4 has a toothing 5, for example driven by a chain drive, not shown to become.
  • a hydraulic adjustment element is generally designated 6.
  • the adjusting element 6 is made consisting of a pump part 7 and a drive part 8.
  • a vane wheel 9 arranged, which is firmly connected to the drive wheel 4.
  • a Analog vane wheel 10 is provided, which is firmly connected to the camshaft 1.
  • Pump part 7 and drive part 8 have a common housing 11, which is not rotatable, however is arranged movable back and forth transversely to the axis of rotation.
  • the housing 11 has a Partition wall 12, which separates the pump part 7 from the drive part 8.
  • Overflow openings 13a, 13b connect the pump part 7 to the drive part 8.
  • the oil supply for the adjusting element 6 takes place via a bore 14 which communicates with the longitudinal bore 3 of the camshaft stands.
  • a screw part 15 mechanically secures the adjusting element 6 on the camshaft 1.
  • a bore 16 of the housing 11 of the adjusting element 6 has a pin 17 inserted with it an operating rod 18 communicates with the housing 11 in the direction of the Double arrow 19 to move back and forth.
  • the adjustment is made by a not shown Adjustment element that can be operated electrically, pneumatically or hydraulically. The adjustment forces required are very low, since essentially only frictional forces must be overcome. The actual adjustment energy is derived from the Drive wheel 4 transmitted moment gained.
  • a driver 20 is provided on the pump part 7, which in a corresponding recess 21 engages on the driving part 8. Through the game between driver 20 and alignment 21, the adjustment range of the camshaft 1 is defined.
  • Fig. 2 is a section through the driving part 8 is shown.
  • a working space 22 is formed for the vane wheel 10 of the drive part 8.
  • Slider 23 of the Vane wheel 10 slide on the inner peripheral surface 22a of the working space 22. Zur To simplify the illustration, only two slides 23 are shown in FIG. 2. Indeed a plurality of sliders are formed on the impeller 10 at equal circumferential intervals.
  • the working space 22 has the shape of a circular cylinder, the axis 22m of the working space 22 relative to the axis 10m of the vane wheel 10, which is also the axis the camshaft 1 is at a distance.
  • the direction of rotation of the camshaft is through indicated the arrow 24.
  • the working space 22 becomes the vane wheel 10 through the opening 13a sucked oil, while through the opening 13b oil in the Working space 22 is pressed.
  • the vane wheel 9 of the pump part 7 is coaxial with the vane wheel 10 of the drive part 8 arranged and not visible in FIG. 2.
  • a working space 25 of the pump part 7 is with a broken line shown in FIG. 2.
  • the working space 25 is opposite the vane wheel 9 offset, its axis 25m in the neutral position of the housing 11 the same Has a distance from the axis 10m, like the axis 22m of the working space 22.
  • the direction of the transfer is opposite.
  • the housing 11 If the housing 11 is now moved downward from the neutral position, the increases Eccentricity of the pump part 7, so that the pumping effect is increased per revolution. At the same time, the oil absorption in the driving part 8 is reduced per revolution. This will causes a leading movement of the driving part 8 relative to the pump part 7, so that a Pre-adjustment of the camshaft 1 relative to the drive wheel 4 takes place. An ending the pre-adjustment is achieved in that the housing 11 is returned to the neutral position becomes. It is essential that the housing 11 essentially in the direction of adjustment no forces act, so that only minimal forces are required for the adjustment are.
  • the respective adjustment state of the camshaft 1 with respect to the drive wheel 4 can be seen in known to be detected by a Hall element, so that even when different Inaccuracies an exact adjustment of the adjustment angle is possible.
  • a drive wheel 4a is arranged coaxially but rotatably has a toothing 5.
  • the drive wheel 4a is with a screw 15a in the axial direction secured.
  • a vane 9, which with the drive wheel 4a is fixedly connected, and a vane wheel 10, which is fixedly connected to the camshaft 1a, arranged.
  • the vane wheels 9, 10 form the essential elements for the pump part 7 or the driving part 8.
  • the housing 11a is eccentric by a roller bearing 30 via holding elements 31 attached to the cylinder head of an internal combustion engine, which is only roughly indicated by 32 is.
  • the axis 30a of the roller bearing 30 is parallel to the axis 1b of the camshaft 1a offset a distance d.
  • the hydraulic Adjusting element 6a is moved out of the neutral position shown in FIG. 3 become.
  • a relative movement between the vane wheels 9 and 10 causes an adjustment of the cam shaft 1a.
  • the angle by which the housing 11a is rotated about the axis 30a can vary depending on the design variant and size of the eccentricity d are between 60 and 240 degrees.
  • the drive in the direction of rotation can be done by various means, preferably an electrical one Stepper motor or a hydraulic adjustment by an adjusting element that by the Pressure is driven by engine oil.
  • an electric drive it is particularly preferred when the housing 11a is firmly connected to the rotor of an electric motor, not shown is or is integrally formed with this. This is a particularly simple one and robust construction possible.
  • the particular advantage of the present invention is that the drive energy for Adjustment of the camshaft is provided by the camshaft drive itself.
  • the externally applied adjustment forces are therefore minimal, so that small and poorly performing Adjusting elements can be used that require little space and are inexpensive to manufacture.

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)
EP98890293A 1997-10-21 1998-10-13 Dispositif pour modifier la phase angulaire d'un arbre à cames de moteur à combustion interne Expired - Fee Related EP0911492B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AT1778/97 1997-10-21
AT177897 1997-10-21
AT177897 1997-10-21
AT142298 1998-08-20
AT1422/98 1998-08-20
AT142298 1998-08-20

Publications (2)

Publication Number Publication Date
EP0911492A1 true EP0911492A1 (fr) 1999-04-28
EP0911492B1 EP0911492B1 (fr) 2002-03-06

Family

ID=25595811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98890293A Expired - Fee Related EP0911492B1 (fr) 1997-10-21 1998-10-13 Dispositif pour modifier la phase angulaire d'un arbre à cames de moteur à combustion interne

Country Status (4)

Country Link
US (1) US6138623A (fr)
EP (1) EP0911492B1 (fr)
AT (1) ATE214125T1 (fr)
DE (1) DE59803257D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SK16982000A3 (sk) * 1998-05-12 2001-04-09 Trochocentric International Ag Prestavovacie zariadenie na prestavenie fázovej polohy hriadeľa
US6257186B1 (en) * 1999-03-23 2001-07-10 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
US6302073B1 (en) * 1999-03-23 2001-10-16 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
US6328006B1 (en) * 1999-03-23 2001-12-11 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
US6277045B1 (en) * 1999-12-08 2001-08-21 Daimlerchrysler Corporation Thin profile cam sprocket with integrated timing target

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103209A (en) 1961-03-10 1963-09-10 Gen Motors Corp Phase adjusting servo mechanism for internal combustion engine and the like
US4091776A (en) 1974-04-04 1978-05-30 Rockwell International Corporation Fluid actuated timing mechanism
EP0363600A1 (fr) * 1988-10-13 1990-04-18 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif de décalage angulaire d'un arbre à cames
DE3929619A1 (de) 1989-09-06 1991-03-07 Bayerische Motoren Werke Ag Kuppelstange fuer eine vorrichtung zur drehwinkelverstellung einer welle relativ zu einem antriebsrad, insbesondere nockenwelle einer brennkraftmaschine
DE4110088C1 (en) 1991-03-27 1992-07-09 Bayerische Motoren Werke Ag, 8000 Muenchen, De Relative shaft bearing position changing mechanism - has annular coupler with inner and outer toothing linked to axially displaceable piston
DE4101676A1 (de) 1991-01-22 1992-07-23 Schaeffler Waelzlager Kg Verstellvorrichtung fuer eine nockenwelle
DE4237193A1 (de) * 1992-11-04 1994-05-05 Bosch Gmbh Robert Verfahren zur Ansteuerung einer Einrichtung zum relativen Verdrehen einer Welle und Einrichtung zum relativen Verdrehen der Welle einer Brennkraftmaschine
EP0781899A1 (fr) 1995-11-30 1997-07-02 Aisin Seiki Kabushiki Kaisha Dispositif de commande du colage des soupapes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415861A1 (de) * 1984-04-28 1985-10-31 Pierburg Gmbh & Co Kg, 4040 Neuss Vorrichtung zur steuerung einer kopplungseinrichtung
DE3929621A1 (de) * 1989-09-06 1991-03-07 Bayerische Motoren Werke Ag Vorrichtung zur relativen drehwinkelverstellung einer welle zu einem antriebsrad, insbesondere nockenwelle einer brennkraftmaschine
JPH04132414U (ja) * 1991-05-29 1992-12-08 株式会社アツギユニシア 内燃機関のバルブタイミング制御装置
US5293845A (en) * 1991-09-02 1994-03-15 Toyota Jidosha Kabushiki Kaisha Control mechanism for engine valve timing
DE4135380A1 (de) * 1991-10-26 1993-04-29 Bosch Gmbh Robert Hydraulische steuereinrichtung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103209A (en) 1961-03-10 1963-09-10 Gen Motors Corp Phase adjusting servo mechanism for internal combustion engine and the like
US4091776A (en) 1974-04-04 1978-05-30 Rockwell International Corporation Fluid actuated timing mechanism
EP0363600A1 (fr) * 1988-10-13 1990-04-18 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif de décalage angulaire d'un arbre à cames
DE3929619A1 (de) 1989-09-06 1991-03-07 Bayerische Motoren Werke Ag Kuppelstange fuer eine vorrichtung zur drehwinkelverstellung einer welle relativ zu einem antriebsrad, insbesondere nockenwelle einer brennkraftmaschine
DE4101676A1 (de) 1991-01-22 1992-07-23 Schaeffler Waelzlager Kg Verstellvorrichtung fuer eine nockenwelle
DE4110088C1 (en) 1991-03-27 1992-07-09 Bayerische Motoren Werke Ag, 8000 Muenchen, De Relative shaft bearing position changing mechanism - has annular coupler with inner and outer toothing linked to axially displaceable piston
DE4237193A1 (de) * 1992-11-04 1994-05-05 Bosch Gmbh Robert Verfahren zur Ansteuerung einer Einrichtung zum relativen Verdrehen einer Welle und Einrichtung zum relativen Verdrehen der Welle einer Brennkraftmaschine
EP0781899A1 (fr) 1995-11-30 1997-07-02 Aisin Seiki Kabushiki Kaisha Dispositif de commande du colage des soupapes

Also Published As

Publication number Publication date
DE59803257D1 (de) 2002-04-11
US6138623A (en) 2000-10-31
EP0911492B1 (fr) 2002-03-06
ATE214125T1 (de) 2002-03-15

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