EP3510258A1 - Commande d'arbre à cames variable - Google Patents

Commande d'arbre à cames variable

Info

Publication number
EP3510258A1
EP3510258A1 EP17768396.8A EP17768396A EP3510258A1 EP 3510258 A1 EP3510258 A1 EP 3510258A1 EP 17768396 A EP17768396 A EP 17768396A EP 3510258 A1 EP3510258 A1 EP 3510258A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
lubricant
cam piece
passage
variable
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
EP17768396.8A
Other languages
German (de)
English (en)
Other versions
EP3510258B1 (fr
Inventor
Tonio-Erik Schultze
Christine Landsberg
Robert Hermann
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP3510258A1 publication Critical patent/EP3510258A1/fr
Application granted granted Critical
Publication of EP3510258B1 publication Critical patent/EP3510258B1/fr
Active 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • 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
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication

Definitions

  • the invention relates to a variable camshaft control according to the preamble of patent claim 1.
  • Four-stroke engines such as Petrol or diesel engines to change during operation.
  • Such a variable camshaft controller has an internally toothed cam piece which is guided over an externally toothed camshaft. In order for a displacement of the cam piece on the camshaft is possible during engine operation, a certain
  • This game provides for a system change of a cam as a result of a change of torque direction in the valve actuation on a roller cam follower for a turnover of the teeth.
  • variable camshaft control o.g. Type according to the invention
  • a lubricant supply means for guiding lubricant provided in a space between the camshaft and the cam piece. There causes the penetrating into the gap lubricant
  • Lubricant damping which reduces in particular the acoustic envelope pulses.
  • a reduction of structure-borne noise pulses by 40% to 50% can be achieved.
  • a much softer sound characteristic can be achieved, and the radiation in the airborne sound is significantly reduced.
  • the wear can be significantly reduced in this way, especially on a ball spring package for axially locking the cam pieces. This further allows the camshaft and cam piece to have a greater backlash, i.e. each produce with larger manufacturing tolerances.
  • a manual assembly with toothing design can be dispensed with, and an automatic production with a corresponding joining system is possible.
  • the gap is located between the camshaft and the cam piece in a region of an external toothing of the camshaft and an internal toothing of the camshaft
  • the lubricant supply means has a passage extending through the cam piece, the passage starting in a lubricant collection area for supporting the cam piece and in the space between the camshaft and the camshaft
  • Cam piece ends. This has the advantage that residual lubricant from a radial bearing for supporting the camshaft directly to the toothing between the camshaft and the
  • Cam piece are guided in the intermediate space.
  • it may also be provided to guide lubricant through a passage in the camshaft in the intermediate space.
  • the passage begins in an undercut of a
  • the undercut is located at an outer edge of the radial bearing surface. Under an undercut according to DIN 509 a "Abtragung on a
  • the undercut is used to create free spaces, which are used as exit zones in the production of tools such as a functional element, the undercut on assemblies / assemblies is required to ensure the flush fitting of counterparts, if no sufficiently large chamfers, radii or curves can be fitted to these counterparts, thus starting the passage immediately the point at which residual lubricant escapes from the radial bearing, so that the escaping residual lubricant can be used particularly effectively in the
  • the passage begins in a radial bearing surface.
  • the passage can be made easier and the residual lubricant from the
  • the passage is at an angle of .mu.m
  • the passage can, on the one hand, be manufactured particularly easily, while on the other hand, the passage can be made, in particular, from an undercut to particularly critical areas in the production line
  • the passage extends in the radial direction through the cam piece.
  • the cam piece may e.g. have a substantially cylinder jacket-shaped or hollow cylindrical basic shape with an outer surface and an inner surface. The passage then begins at the outer surface and ends at the inner surface. With respect to the substantially cylinder jacket-shaped or hollow cylindrical basic shape, the passage extends in the radial direction.
  • radial direction is understood to mean a direction which extends essentially radially inward or outward, but does not necessarily run at right angles to the extension axis (longitudinal axis) of the camshaft not necessarily straight, but may also have bow sections or kinks.
  • the lubricant supply means at least one bore extending through the camshaft, wherein preferably the
  • Camshaft is a hollow shaft and the at least one bore extends in the radial direction through the camshaft.
  • the lubrication can therefore also be done by a hole in the external gear camshaft.
  • the lubricant supply device can be designed for pressureless guidance of lubricant in the intermediate space. Thus, no work is done by a lubricant pump to remove lubricant, e.g. to promote through the passage. Therefore, the
  • Lubricant supply means be adapted to effect an active lubrication of the toothing between the camshaft and the cam piece, that is, lubricant, such as oil, conveyed under pressure into the intermediate space. Furthermore, an internal combustion engine with such a variable camshaft control belongs to the invention.
  • FIG. 1 is a schematic sectional view of a first embodiment of the invention
  • Fig. 2 is a schematic sectional view of a second embodiment of the invention.
  • Fig. 3 is a schematic sectional view of another embodiment of the invention. Reference is first made to Fig. 1 reference.
  • variable camshaft controller 10 for an internal combustion engine, such as an engine.
  • a four-stroke engine such as a gasoline or diesel engine.
  • variable camshaft control 10 has an externally toothed camshaft 12 and an internally toothed cam piece 14.
  • gearing of the cam piece 14 and the toothing of the camshaft 12 given or required.
  • the backlash is in a range of e.g. 0.65 mm to 0.7 mm.
  • a radial bearing for rotatably supporting the cam piece 14 has a supply line through which lubricant, e.g. Oil is supplied to a circumferential annular gap of the radial bearing to cause lubrication of the bearing point of the cam piece 14.
  • lubricant e.g. Oil
  • a lubricant supply device 20 is provided, with a
  • Lubricant damping can be achieved, in particular the acoustic
  • the lubricant supply device 20 has four in the present embodiment
  • Passages 16a, 16b, 16c, 16d each extending through the cam piece 14 in a substantially radial direction. Furthermore, the cam piece 14 in the present
  • Embodiment a substantially cylinder jacket-shaped or hollow cylindrical basic shape with an outer surface and an inner surface. The four connect
  • the passages 16a and 16c shown in Fig. 1 on one side and 16b and 16d on the other side are arranged in the circumferential direction of the cam piece 14 equally spaced from each other. It can be distributed over the circumference also provided more than two passes. Furthermore, the two left-hand passages 16a and 16c in FIG. 1 are arranged in the direction of extension of the camshaft 12 at a distance from the two right-hand passages 16b and 16d in FIG. In addition, the passages 16a, 16b and 16c, 16d can also be arranged offset from each other in the circumferential direction.
  • the four passages 16a, 16b, 16c, 16d begin in a lubricant collecting area 18 and terminate in an approximately cylindrical space 22 between the camshaft 12 and the cam piece 14.
  • the four passages 16a, 16b, 16c, 16d begin in a lubricant collecting area 18 and terminate in an approximately cylindrical space 22 between the camshaft 12 and the cam piece 14.
  • the undercuts define a radial bearing surface 26 in the axial direction.
  • the gap 22 is bounded on the one hand by the inner surface of the cam piece 14.
  • lubricant collecting area 18 lubricant leaking from the radial bearing (not shown) collects. This can be achieved by the four passages 16a, 16b, 16c, 16d of the
  • Grease collection area 18 enter the gap 22.
  • the clearance 22 is limited by the outer surface of the camshaft 12.
  • the camshaft control 10 shown in FIG. 2 differs from the camshaft control 10 illustrated in FIG. 1 in that the lubricant supply device 20 has two passages 16a, 16b which respectively start in the radial bearing surface 26 and at an angle of substantially 90 ° to the extension axis the camshaft 12 extend.
  • the two passages 16a, 16b start outside the undercuts 24a, 24b and have a radial orientation without an axial component.
  • the two passages 16a, 16b are arranged in the axial direction of the extension axis of the camshaft 12 at a distance of approximately 10 mm to approximately 25 mm, preferably with a spacing of 12 mm or 18 mm.
  • the radial bearing surface 26 thereby provides a contact region between the radial bearing, not shown, and the
  • the radial bearing surface 26 extends in the present embodiment, the width of the radial bearing in the direction of extension of the camshaft 12th
  • lubricant is delivered from the lubricant pump through the supply line to the annular gap. Lubricant then exits from the radial bearing and passes without pressure through the four passages 16a, 16b, 16c, 16d or two passages 16a, 16b in the
  • FIG. 3 partially illustrates a longitudinal section through a camshaft control.
  • the one section, here longitudinal section, characteristic hatching are omitted in this case for the sake of clarity.
  • the lubricant supply device 20 has at least one bore 28 extending through the camshaft 12.
  • the camshaft 12 is at least in this embodiment, a hollow shaft, wherein the at least one bore 28 extends in the radial direction through the camshaft 12.
  • the bore 28 extends diametrically through the bore 28
  • the bore 28 thus extends from an opening provided in the camshaft 12 inner bore 30 in the radial direction of the camshaft to the gap 22 between the camshaft 12 and the cam piece 14, as indicated in Fig. 3

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

La présente invention concerne une commande d'arbre à cames variable (10) comprenant un arbre à cames (12) à denture extérieure, une pièce à cames (14) à denture intérieure, la pièce à cames (14) étant agencée sur l'arbre à cames (12) de façon à pouvoir se déplacer axialement, un espace intermédiaire (22) qui est formé entre l'arbre à cames (12) et la pièce à cames (14) dans une zone d'une denture extérieure de l'arbre à cames (12) et d'une denture intérieure de la pièce à cames (14), et un dispositif d'apport de lubrifiant (20) pour amener du lubrifiant dans l'espace intermédiaire (22). Selon l'invention, le dispositif d'apport de lubrifiant (20) présente un passage (16a, 16b, 16c, 16d) qui s'étend à travers la pièce à cames (14), le passage (16a, 16b, 16c, 16d) commençant dans une zone d'accumulation de lubrifiant (18) pour le logement de la pièce à cames (14) et se terminant dans l'espace intermédiaire (22).
EP17768396.8A 2016-09-08 2017-09-06 Commande d'arbre à cames variable Active EP3510258B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016217146.1A DE102016217146A1 (de) 2016-09-08 2016-09-08 Variable Nockenwellensteuerung
PCT/EP2017/072320 WO2018046529A1 (fr) 2016-09-08 2017-09-06 Commande d'arbre à cames variable

Publications (2)

Publication Number Publication Date
EP3510258A1 true EP3510258A1 (fr) 2019-07-17
EP3510258B1 EP3510258B1 (fr) 2021-03-31

Family

ID=59895279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17768396.8A Active EP3510258B1 (fr) 2016-09-08 2017-09-06 Commande d'arbre à cames variable

Country Status (3)

Country Link
EP (1) EP3510258B1 (fr)
DE (1) DE102016217146A1 (fr)
WO (1) WO2018046529A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017203869A1 (de) * 2017-03-09 2018-09-13 Thyssenkrupp Ag Nockenwelle mit geschmiertem Schiebestück

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908286B4 (de) 1999-02-26 2007-03-01 Dr.Ing.H.C. F. Porsche Ag Variable Ventilsteuerung für Brennkraftmaschinen
DE10054623A1 (de) * 2000-11-03 2002-05-08 Audi Ag Vorrichtung zum Umschalten zumindest eines Nockenpaketes
DE102006012386B3 (de) 2006-03-15 2007-08-30 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für eine Brennkraftmaschine
DE102009048621B4 (de) 2009-10-06 2016-07-07 Audi Ag Ventiltrieb für Gaswechselventile mit Verspannung von Grundnockenwelle und Nockenträger in Umfangs- oder Drehrichtung
DE102010055056B4 (de) 2010-12-17 2020-11-26 Audi Ag Ventiltrieb für Gaswechselventile mit unterschiedlichem Spiel zwischen Verzahnungen einer Grundnockenwelle und eines darauf verschiebbaren Nockenträgers
DE102011002142B4 (de) * 2011-04-18 2022-07-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kulissenschaltung für eine Nockenwelle
DE102012103594B4 (de) 2012-04-24 2015-08-27 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit durch Spritzöl beölbare, verstellbare Nocken
JP6070586B2 (ja) * 2014-01-21 2017-02-01 マツダ株式会社 エンジンの動弁装置の組付方法

Also Published As

Publication number Publication date
EP3510258B1 (fr) 2021-03-31
WO2018046529A1 (fr) 2018-03-15
DE102016217146A1 (de) 2018-03-08

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