EP1522683A1 - Commande de soupape - Google Patents

Commande de soupape Download PDF

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Publication number
EP1522683A1
EP1522683A1 EP03103691A EP03103691A EP1522683A1 EP 1522683 A1 EP1522683 A1 EP 1522683A1 EP 03103691 A EP03103691 A EP 03103691A EP 03103691 A EP03103691 A EP 03103691A EP 1522683 A1 EP1522683 A1 EP 1522683A1
Authority
EP
European Patent Office
Prior art keywords
cam follower
valve
face
central axis
control element
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
EP03103691A
Other languages
German (de)
English (en)
Other versions
EP1522683B1 (fr
Inventor
Michael Georg Figura
Torsten Kluge
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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 Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to DE50309328T priority Critical patent/DE50309328D1/de
Priority to EP20030103691 priority patent/EP1522683B1/fr
Publication of EP1522683A1 publication Critical patent/EP1522683A1/fr
Application granted granted Critical
Publication of EP1522683B1 publication Critical patent/EP1522683B1/fr
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

Definitions

  • the invention relates to a valve train with a valve, which is a cam follower with associated with a profiled end face, wherein at least one control acts on the profiled end face such that the cam follower along a Center axis is movable.
  • the invention also relates to a method for Operating a valve train with a valve, the cam follower with profiled Face is associated with at least one control on the profiled Surface acts so that the cam follower moves along a central axis becomes.
  • valve trains are known.
  • the individual valves at low engine speeds with short opening time, little overlap and small stroke open.
  • the individual valves with long opening times, high overlap and large stroke open is done by means of a camshaft are arranged on the cam, which cooperate with a cam follower reached.
  • EP 0 292 185 B1 discloses a cam mechanism with a cam.
  • the cam is basically round in shape and has a projection.
  • the projection extends radially outward along a part of its circumference.
  • the Camming mechanism also has a cam follower for a back and forth Moving movement along a perpendicular to the axis of rotation of the cam Axis is arranged.
  • the cam acts on an end face of the cam follower. By abutment of the projection is a movement of the cam follower caused.
  • the end face of the cam follower is profiled.
  • a facility is provided to axially rotate the cam follower to the angular orientation of the profiled end face with respect to the axis of rotation of the cam to change the To adjust angular positions in which the projection engages the end face and separates from her. This will determine the duration of movement of the cam follower set.
  • the end face of the cam follower has a pair of flat surfaces which follow are inclined outside against the cam.
  • the flat surfaces are smooth with each other connected, wherein a transition is designed arcuate.
  • the cam follower is by means of a rack, which is mounted transversely to the cam follower and on it formed teeth engages rotatable by an angular amount.
  • the invention has for its object to provide an improved valve train for To provide, with a structurally simple design a large Variation width of the valve lift and or to achieve the valve timing.
  • the invention is based on the finding that a rotational movement in a translational movement is converted. This is conventionally done by two Elements that reaches the camshaft and the cam follower. In contrast to the invention combines both movements in one element, the cam follower.
  • the cam follower performs a rotary motion about its translatory Motion axis off. This can be dispensed with a camshaft.
  • the cam follower advantageously has a encircling sprocket in which a rotary drive engages.
  • the rotary drive can be designed as an example worm drive or spur gear. So the Valve lift can be performed during the rotational movement, it is useful if the end face has a wave profile.
  • the end face is hereby alternating with Elevations and depressions provided, which are connected by flanks.
  • Cheap Within the meaning of the invention if the end face with its elevations also in such a way is designed that in the zenith of the elevation a kind of inclined surface with a Tilt towards the central axis arises.
  • the control is on the one hand the profiled face and on the other hand on an abutment.
  • the control In the Rotary movement of the cam follower passes the control alternately in one Deepening and on a subsequent survey, so that a lift curve for the Valve is created.
  • the control In the simplest case, the control is stationary, so that a simple stroke curve is traversed.
  • the control can be z.
  • a preferred embodiment of the invention provides that the control in Circumferential direction of the cam follower is rotatably mounted.
  • a Rotational movement of the control in the counterclockwise or counterclockwise direction the center axis of the cam follower adjusted by a certain angle so the Lifting curve of the respective valve relative to the angular position of a crankshaft Internal combustion engine and the same specific angle.
  • a timing shift of the valves relative to the crankshaft be achieved.
  • the control in the direction of Center axis and away from it is movable.
  • the stroke of the cam follower and thus the valve adjustable is the control at a maximum distance to the central axis. In this position turns the Face with highest elevations and deepest depressions under the Control.
  • the valve can with a maximum stroke along its Center axis to be moved back and forth. At lower speeds, that moves Control towards the center axis. The stroke of the cam follower and thus of the valve is thereby reduced.
  • control of the control in the respective position is by means of a achieved appropriate control mechanism.
  • This can z. B. hydraulic, pneumatic or operated servo-electrically.
  • the control can be configured as a bearing, for example as a support bearing.
  • a roller is arranged in a roller bearing. That's what it stands for with its role Control in conjunction with the profiled end face, wherein the roller bearing rests against the counter bearing. As the cam follower rotates, the roller rolls up whose profiled face off. Because the roller bearing rests against the counter bearing, a translational movement of the cam follower is obtained because the roller alternately the collection and depression in the circumferential direction of the cam follower passes.
  • the control is non-positively on the one hand with the end face and on the other hand connected to the counter bearing. This is done by means of a valve spring reached. It is also possible that the bearing is designed as a sliding bearing.
  • the control can also be designed as a disk.
  • the disc points prefers a profiling complementary to the wave profile.
  • the Disc rotationally fixed and be adjusted by certain phase angle. But it is also possible that the disc in opposite directions to the direction of rotation of Cam follower turns.
  • By using a disc is advantageous one Line contact with the face in front.
  • the drive of the cam follower can also z. B. by the teeth of the Cam follower, wherein a first toothing of a first cam follower in a second toothing of a second cam follower engages, etc.
  • z. B. only the first cam follower of a valve series z. B. via a worm wheel are driven.
  • combinations of worm wheel shaft and one another driven cam followers are conceivable.
  • an improved valve train which with a structurally simple design a wide range of variation of the valve lift, the Opening time and the control times reached.
  • valve trains with multiple cam followers and / or Slices be provided. Although it can be dispensed with a camshaft is It is possible to combine a camshaft with a cam follower to provide, which rotates about its central axis.
  • the invention relates to processes that are suitable to those previously execute described valve trains.
  • FIG. 1 shows a valve drive 1 with a valve 2.
  • the valve 2 is in a bore 3 a cylinder head 4 of an internal combustion engine added. To the special Design of the bore 3 will be discussed below.
  • the valve 2 protrudes a spring plate 5 in the bore 3 inside. With its valve plate 6, the valve is the second arranged within a combustion chamber.
  • the valve plate 6 is connected to a Inlet or outlet channel 7 adapted.
  • the valve 2 is in a conventional manner a Associated valve spring 8.
  • the valve 2 is assigned a cam follower 9.
  • the cam follower 9 is as one-sided open rotationally symmetrical hollow body with a front plate 11 and a cylindrical wall 12 is formed.
  • the cylindrical wall 12 is also known as a pestle shirt.
  • the end plate 11 has a profiled end face 13 on. With an opposite to the profiled face 13 levels Contact surface is the cam follower 9 on the spring plate 5 or on the Valve stem preferably rotatable.
  • a circumferential Sprocket 14 On the cylindrical wall 12 is on the outside of a circumferential Sprocket 14 arranged.
  • the rotary drive 16 is exemplified as Worm drive with a shaft 18 and a toothed ring 19 configured, wherein the Tooth ring 19 driven by the shaft 18 engages in the ring gear 14.
  • the Cam follower 9 in spite of the engagement of the toothed ring 19 in the ring gear 14 a Can perform lifting movement along its central axis Y-Y, the toothed ring 19 on its inner side facing the ring gear 14 preferably one Straight toothing, which is complementary to the toothing of the ring gear 14 is designed.
  • the Tooth ring 19 On its opposite side to the inside, the Tooth ring 19 a complementary to the shaft 18 helical toothing, in which the Shaft 18 engages with their teeth.
  • the rotary drive 16 also have a spur gear which engages directly in the ring gear 14, wherein appropriate teeth are provided.
  • the Cam follower 9 by means of a rotary driven roller with corresponding Toothing is turned.
  • at least one correspondingly toothed support roller for guiding the cam follower 9 be provided, which exemplarily diametrically opposite to rotationally driven roller would be arranged.
  • the rotary driven roller and the Support roller would be stored in a conventional manner.
  • This can be the Turn cam follower 9 about its center axis Y-Y.
  • the center axis Y-Y is preferably congruent to a central axis of the valve 2.
  • the bore 3 is formed stepwise with several sections.
  • a Base portion 21 is the bore 3 to the outer diameter of the cam follower 9, wherein a gap 22 between the outside of the cam follower 9 and the bore wall is formed.
  • the base section 21 is followed Sprocket section 23 on.
  • the sprocket portion 23 has a larger one Diameter than the base portion 22.
  • the sprocket portion 23 is connected to the Outer diameter of the ring gear 14 adapted.
  • the sprocket section 23 goes in a toothed ring section 24 via.
  • the toothed ring section 24 has a larger one Diameter on than the sprocket portion 23, and is on the toothed ring 19th customized.
  • the diameter of the toothed ring portion 24 is the largest Bore diameter dar.
  • a fastener 26 is arranged in the bore 3.
  • the Fastener 26 is configured as a sleeve 27 with a support flange 28. With its support flange 28, the fastener 26 with a Attachment side 29 attached to the cylinder head 4.
  • the sleeve 27 protrudes into the Bore 3 in and is essentially free of play on the bore wall.
  • the sleeve 27 has an inner diameter that of the base portion 21st the hole 3 corresponds.
  • An opposite to the support flange 28 End portion 31 of the sleeve 27 has a step 32, so that a Hubausappelung 33 is formed for the ring gear 14.
  • the Hubausnaturalung 33 has a to Sprocket section 23 corresponding diameter. Advantages of this Embodiment will be explained below.
  • the End portion 31 adapted to the rotary drive 16, preferably rounded.
  • anvil 34 is attached at the opposite side to the mounting side 29 of the support flange 28 .
  • the counter-bearing 34 is shown in the Embodiment designed as a cover plate and closes the bore. 3
  • a force-locking threaded connection is preferably selected become.
  • a continuous screw be selected so that the anvil 34 and the fastener 26th be attached to the cylinder head 4 at the same time.
  • control element 36 On the end face 13, at least one control element 36 is arranged. in the illustrated embodiment, two controls 36 on the end face 13 arranged. Since both controls 36 are configured the same is only one described.
  • the control 36 is as a support bearing with a roller 37 and a Roller bearing 38 configured.
  • the roller 37 is rotatable from the roller bearing 38 added. With its role 37, the control 36 is located on the profiled Face 13 on. With its roller bearing 39, the control 36 is located on the Counter bearing 34 on.
  • the control element 36 is associated with a control mechanism, not shown and on the one hand in the direction of the central axis Y-Y and the other of this directed away steplessly movable. This is illustrated by means of the double arrow 41. In Circumferential direction of the cam follower 9, the controls 36 are preferably rotation. The benefits are described below.
  • FIG. 2 shows an exemplary profiling of the end face 13.
  • the End face 13 has a wave profile with elevations 42 and recesses 43.
  • the Elevations 42 go over rounded edges 44 in the recesses 43 and vice versa.
  • the flanks 44 each have a concave and a convex Section on which smoothly merge.
  • According to the illustration in Figure 1 are each two diametrically opposed elevations 42 and Recesses 43 shown.
  • more surveys 42 and Recesses 43 are provided.
  • there could be more controls 36 are provided.
  • For an even number of controls 36 is preferably an even number of surveys 42 and recesses 43rd selected.
  • the control 36 is always non-positively connected to the end face 13 and the anvil 34.
  • the Hubausappelung 33 is of its design to the maximum stroke adjusted, so that an undisturbed lifting movement of the cam follower 9 despite the Sprocket 14 is possible.
  • Control mechanism a stepless displacement of the controls 36 from the in Figure 1 shown position in the direction of the central axis Y-Y.
  • Exemplary here is the Lift curve 48 as the average lift curve and the lift curve 49 as a low lift curve shown.
  • the controls 36 are synchronous with each other Position displaced, so that there are a variety of lifting curves, the For reasons of clarity, but not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
EP20030103691 2003-10-06 2003-10-06 Commande de soupape Expired - Lifetime EP1522683B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE50309328T DE50309328D1 (de) 2003-10-06 2003-10-06 Ventiltrieb
EP20030103691 EP1522683B1 (fr) 2003-10-06 2003-10-06 Commande de soupape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030103691 EP1522683B1 (fr) 2003-10-06 2003-10-06 Commande de soupape

Publications (2)

Publication Number Publication Date
EP1522683A1 true EP1522683A1 (fr) 2005-04-13
EP1522683B1 EP1522683B1 (fr) 2008-03-05

Family

ID=34306979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030103691 Expired - Lifetime EP1522683B1 (fr) 2003-10-06 2003-10-06 Commande de soupape

Country Status (2)

Country Link
EP (1) EP1522683B1 (fr)
DE (1) DE50309328D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009006894A1 (de) * 2009-01-28 2010-07-29 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Vorrichtung zur Schaltbetätigung eines hydraulischen Ventilspielausgleichselements

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061115A (en) * 1976-06-01 1977-12-06 Predhome Jr Wilfred F Valve train for internal combustion engine
EP0292185A2 (fr) * 1987-05-21 1988-11-23 Jaguar Cars Limited Mécanismes à came
JPH0367010A (ja) * 1989-08-04 1991-03-22 Nippondenso Co Ltd 内燃機関の吸排気弁駆動機構
GB2327711A (en) * 1997-07-30 1999-02-03 Avl List Gmbh Variable timing i.c. engine valve actuating arrangement eg for internal EGR
JP2001329810A (ja) * 2000-05-22 2001-11-30 Toyota Motor Corp バルブ駆動装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061115A (en) * 1976-06-01 1977-12-06 Predhome Jr Wilfred F Valve train for internal combustion engine
EP0292185A2 (fr) * 1987-05-21 1988-11-23 Jaguar Cars Limited Mécanismes à came
JPH0367010A (ja) * 1989-08-04 1991-03-22 Nippondenso Co Ltd 内燃機関の吸排気弁駆動機構
GB2327711A (en) * 1997-07-30 1999-02-03 Avl List Gmbh Variable timing i.c. engine valve actuating arrangement eg for internal EGR
JP2001329810A (ja) * 2000-05-22 2001-11-30 Toyota Motor Corp バルブ駆動装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 225 (M - 1122) 10 June 1991 (1991-06-10) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 03 3 April 2002 (2002-04-03) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009006894A1 (de) * 2009-01-28 2010-07-29 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Vorrichtung zur Schaltbetätigung eines hydraulischen Ventilspielausgleichselements
DE102009006894B4 (de) * 2009-01-28 2010-10-14 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Vorrichtung zur Schaltbetätigung eines hydraulischen Ventilspielausgleichselements
US8166941B2 (en) 2009-01-28 2012-05-01 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Device for switching activation of a hydraulic valve play equalization element

Also Published As

Publication number Publication date
EP1522683B1 (fr) 2008-03-05
DE50309328D1 (de) 2008-04-17

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