EP2649281B1 - Ensemble d'arbre a cames et son procede de fabrication - Google Patents

Ensemble d'arbre a cames et son procede de fabrication Download PDF

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Publication number
EP2649281B1
EP2649281B1 EP20120713896 EP12713896A EP2649281B1 EP 2649281 B1 EP2649281 B1 EP 2649281B1 EP 20120713896 EP20120713896 EP 20120713896 EP 12713896 A EP12713896 A EP 12713896A EP 2649281 B1 EP2649281 B1 EP 2649281B1
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EP
European Patent Office
Prior art keywords
camshaft
axial
axial section
material region
armature
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.)
Active
Application number
EP20120713896
Other languages
German (de)
English (en)
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EP2649281A1 (fr
Inventor
Stefan Bender
Thomas Schiepp
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.)
ETO Magnetic GmbH
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ETO Magnetic GmbH
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Filing date
Publication date
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Publication of EP2649281A1 publication Critical patent/EP2649281A1/fr
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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
    • 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
    • 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
    • F01L2001/0475—Hollow 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
    • 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
    • F01L1/3442—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 using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • F01L2001/3443—Solenoid driven oil control valves
    • 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
    • F01L1/3442—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 using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • F01L2001/34433—Location oil control valves
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49293—Camshaft making

Definitions

  • the invention relates to a camshaft assembly comprising a receiving space in its interior, i. At least partially formed as a hollow shaft camshaft, at least in sections, in particular in the range of an electromagnetic actuator, from a magnetizable (flow-conducting) material for an internal combustion engine and an electromagnetic actuator for actuating a Stellpartners, in particular a control valve of a, preferably hydraulic, camshaft adjuster, with a coil winding and an adjustable by energizing the coil winding armature for cooperation with the control partner according to the preamble of claim 1. Further, the invention relates to a method for producing such a camshaft assembly according to the preamble of claim 12 and an engine block according to claim 16.
  • a camshaft assembly comprising a hydraulic phaser is in the EP 1 596 040 A2 described.
  • the camshaft adjuster is used to set the opening or closing time of gas exchange valves of the internal combustion engine.
  • an alternative camshaft assembly comprising a camshaft adjuster whose control valve is adjustable by means of an electromagnetic actuator.
  • the electromagnetic actuator of the known camshaft assembly is disposed on the front side of the camshaft and cooperates axially with the arranged in the camshaft control valve of the camshaft adjuster together.
  • a camshaft assembly is known in which a coil winding for contactless adjustment of an armature along the camshaft rotation axis is disposed within the camshaft.
  • a camshaft assembly is known in which the coil winding is arranged to actuate a cooperating with a control valve of a camshaft adjuster armature in a housing outside of the engine block, with axial distance to the fully recorded in the engine view camshaft.
  • a projecting into the housing for the coil winding yoke and core unit is fixed, wherein the yoke and core of the yoke and core unit are connected to each other via non-magnetic material.
  • a disadvantage of the known camshaft assembly is that it has a comparatively high space requirement.
  • the invention is therefore based on the object to provide an alternative camshaft assembly whose space requirements, in particular in the region of the end face of the camshaft, is reduced. Furthermore, the object is to provide a method for producing such a space-optimized camshaft assembly.
  • camshaft assembly With regard to the camshaft assembly, the object is achieved with the features of patent claim 1 and with regard to the manufacturing method for producing such a camshaft assembly having the features of claim 12.
  • the invention is based on the idea of arranging the armature, at least in sections, preferably completely, inside the camshaft, at least partially designed as a hollow shaft, ie in a receiving space formed in the interior of the camshaft and the coil winding for adjusting the armature radially spaced from the armature, and although outside the camshaft.
  • the camshaft has a first and a second axial section, between which a material region influencing the magnetic flux is provided and it is intended to increase the magnetic flux from one of the axial sections to the respective other axial section (in comparison to a design without such a material section) via the armature and via the possibly oil-filled air reservoir provided between the inner circumference of the camshaft and the armature.
  • the material region is thus such that it "forces" the magnetic flux, at least for the most part, very particularly preferably completely from one of the axial sections to the armature and from the armature to the respective other axial section such that the magnetic flux blocks the distance between the axial sections and the axial section Crossing anchor and taking the "detour" over the anchor.
  • a space-saving, efficiency-optimized design of the electromagnetic actuator is obtained.
  • an axially adjacent to the camshaft yoke and core unit is dispensed with, since this function is taken over by the first and the second axial portion of the camshaft.
  • camshaft is arranged completely within an engine block. More preferably, the armature and the coil winding are also completely within the engine block and not as in the prior art on a fixed outside of the engine block housing, which is preferably completely omitted according to further development.
  • the region influencing the magnetic flux does not protrude in the radial direction beyond the axially adjacent camshaft sections or over their, preferably common, cylindrical, enveloping contour.
  • the invention provides that the material forming the material region, ie the material that is comprised in the material region or of which it consists, is not magnetically conductive or at least less magnetically conductive than the (other) material of the camshaft.
  • the claimed magnetizable material of the camshaft is to be understood as meaning the material or the material combinations of the camshaft adjacent to the material region influencing the magnetic flux, ie the material (s) from which or which the axial sections are formed.
  • the magnetic flux influencing material area of a not or at least less magnetizable material, preferably metal, for example bearing materials, such as brass Due to the formation of the magnetic flux influencing material area of a not or at least less magnetizable material, preferably metal, for example bearing materials, such as brass, an optimal magnetic separation between the two axial sections is achieved.
  • This magnetic separation can be completely or only partially realized, depending on whether the two axial sections are connected to each other exclusively via the material region influencing the magnetic flux, or whether a material bridge of camshaft material is provided in addition to the material region.
  • the quality or the extent of the magnetic separation is also influenced by the choice of material of the material area, ie by whether non-magnetizable or difficult to magnetize material is used.
  • magnetizable in the sense of "flux-conducting", i. a magnetizable material is flux-conducting, whereas a hardly magnetizable material is poorly flux-conducting, i. the hard magnetizable material provides a great resistance to the magnetic flux.
  • Non-magnetizable material is not flux-conducting.
  • Magneticnetizable means not a possible remanence (magnetizability) of the material but that a significant magnetization of the material under external magnetic field occurs.
  • the camshaft preferably at least in the region of the setting unit (actuator region), is formed from magnetizable (flux-conducting) material, in particular a suitable steel.
  • first and the second axial section are mechanically fixed to one another via the material region.
  • first and the second axial section are connected to one another by welding, in particular build-up welding, using material that is not or only slightly magnetically conductive.
  • the material region is formed by a solder material which, although the Material sections mechanically bonded together, but in contrast to a welding process does not produce a material-locking, yet a mechanically strong connection.
  • the camshaft surface (surface) is processed after welding or soldering, in particular smoothed, for example by twisting and / or grinding.
  • an additional material in particular a solder or welding material for forming the material region
  • Another alternative production possibility is to provide as the magnetic flux influencing material area between the first and the second axial section, a ring member or hollow cylinder member of a non- or poorly magnetically conductive material, such as brass, which in a suitable manner, for example by friction welding with the two axial sections, preferably connected to the mutually facing end faces of the axial sections.
  • a ring member or hollow cylinder member of a non- or poorly magnetically conductive material such as brass
  • the material region between the two axial sections of the camshaft is generated by filling a clearance with, preferably not or poorly magnetizable material, wherein the free space can be a recess, in particular a circumferential groove in the camshaft, that is, in addition to the free space, in particular radially inward adjacent one, preferably as thin as possible, connection of camshaft material between the two axial sections of the camshaft remains.
  • the free space may be a complete separation, ie a radially continuous, in particular circumferentially closed, gap or axial distance between the two Axial sections of the camshaft act.
  • the free space is filled by build-up welding, in which case the non or poorly conducting magnetic material is applied in a fluid, heated state.
  • this connecting portion in particular ring portion designed so thin or provided with such a thin cross section in the radial direction that when energizing the coil winding (fast) a magnetic saturation is achieved, whereby negative effects of the magnetizable connection portion are minimized to the efficiency of the electromagnetic actuator ,
  • the camshaft except for the area influencing the magnetic flux, has a maximum of two parts, ie not more than two parts.
  • a one-piece design is possible if the two axial sections, as described above, are connected to one another via a material bridge or the region influencing the magnetic flux by structural transformation of a Camshaft section is generated.
  • the two axial sections are connected to one another (preferably exclusively) via the material region influencing the magnetic flux.
  • the camshaft has an axially continuous cylindrical outer contour.
  • the material region With regard to the geometric configuration of the non-magnetizable or poorly magnetizable material region, there are different alternatives.
  • the material region In principle, it is possible to provide the material region with a rectangular cross-section contour. It is particularly expedient, in particular in order to obtain the largest possible connecting or fixing surfaces between the axial sections and the material region, when the connecting surfaces or holding surfaces between the material region and the axial sections are formed obliquely. This can be achieved, for example, by extending the axial extent of the material region over its radial extension, i. looking towards the anchor decreases.
  • the material area of non-magnetizable or heavily magnetizable material is circumferentially closed, i. is annular.
  • the coil winding is arranged coaxially to the camshaft, thus enclosing this ring.
  • the coil winding is arranged next to the camshaft, preferably in such a way that a coil winding axis runs parallel to the camshaft. It is also conceivable to arrange a plurality of circumferentially juxtaposed, i. Provide distributed over the circumference of the camshaft coil windings.
  • the armature is at least partially in the camshaft, more specifically provided in the camshaft, preferably taken from this limited recording room. It is particularly expedient with regard to an optimized space requirement if the armature is arranged over the largest part of its axial extent, preferably completely in the camshaft. It is likewise preferred if the control partner, in particular a control valve of a camshaft adjuster with which the armature cooperates, is received at least in sections, preferably completely in the camshaft. It is particularly expedient if the setting partner projects at least axially from one end face into the camshaft.
  • the invention also leads to a method for producing a camshaft assembly according to the invention.
  • the core of the method is that in an (intermediate) area between a first axial section and a second axial section of a camshaft, preferably the two axial sections mechanically firmly interconnecting, material region is provided so that thereby a magnetic flux guide is effected, in which the magnetic flux is increased from one of the axial sections of the camshaft to the respective other axial section via the armature (compared to a variant without such a material region).
  • the material region by filling, for example by means of build-up welding, a free space between the two axial sections with a material which is not or at least less easily magnetizable than the material of the two axial sections of the camshaft.
  • the two axial sections of the camshaft preferably consist of the same material.
  • a variant embodiment is conceivable in which the two camshaft axial sections consist of different materials.
  • the free space of this is preferably prepared, alternatively by machining a camshaft blank, for example by Inserting a groove or by separating a previously one-piece camshaft body blank, wherein it is particularly preferred if the production of the free space in the same clamping takes place as the filling of the free space, to avoid repositioning of the two axial sections in the case of complete separation.
  • the material region preferably no clearance is filled up, but the originally magnetizable material of the camshaft body blank is partially processed (changed), so that the material in the later material region is not or at least less easily magnetizable than the material of the first and / or second axial section.
  • the material in the later material area for example, partially processed by heat treatment.
  • Fig. 1 is a schematic longitudinal sectional view of a camshaft assembly with a hollow camshaft of a magnetizable material, here steel, and a hydraulic camshaft adjuster 3, an electromagnetic actuator 4 and a control partner 5 for the electromagnetic actuator in the form of a control valve of the camshaft adjuster 3 shown.
  • the camshaft adjuster 3 is arranged and fixed together with control partner 5 (control valve) on the camshaft 2 in a conventional manner.
  • a not separately shown camshaft adjuster housing is directly or indirectly connected to a likewise not shown crankshaft of the internal combustion engine, also not shown, and driven by this.
  • camshaft adjuster 3 with the camshaft 2 connected, not shown adjusting which can be rotated by a hydraulic actuation in a conventional manner relative to the camshaft adjuster housing. The rotation of these adjusting causes a phase adjustment of the camshaft 2 relative to the crankshaft.
  • the electromagnetic setting unit 4 comprises an armature 7 arranged in the camshaft 2, more precisely in a receiving space 6 of the camshaft 2, which is mounted axially displaceable and by energizing a coil winding 8 arranged radially outside and at a distance from the camshaft 2 in the axial direction of the camshaft 2 is adjustable.
  • the armature 7 is axial arranged adjacent to the adjusting partner 5, which is alternatively arranged completely in the camshaft 2 and projects axially into it. It is also conceivable that the control partner is located outside the camshaft 2 and the armature 7 protrudes a distance from the camshaft 2.
  • control partner 5 is a control valve of the camshaft adjuster 3, wherein the camshaft adjuster 3 can be controlled by the hydraulic camshaft adjuster 3 by the control valve (control partner 5) in an amount required for the desired adjustment and the necessary pressure causing hydraulic fluid is supplied.
  • control partner 5 controls the hydraulic fluid, the adjusting elements of the camshaft adjuster 3 are rotated relative to the housing of the camshaft adjuster 3, which then, as explained in a phase adjustment of the camshaft 2 results.
  • the camshaft 2 comprises a first axial portion 9 and a second axial portion 10. Between the first and the second axial portion 9, 10, a magnetic flux influencing material region 11 is provided from a no or only poorly magnetizable material. In the embodiment shown according to Fig. 1 the two axial sections 9, 10 are fixed to one another or connected to one another exclusively via this material region 11. The material region 11 forms a complete or partial magnetic separation of the two axial sections 9, 10.
  • the material region 11 serves to draw the merely schematically drawn magnetic flux 12 from one of the axial sections via an optionally oil-filled or air-filled (peripheral) gap 13 to the armature 7 to pass, which is penetrated axially by the magnetic flux 12 and then again from the armature 7 back across the gap 13 to the other axial portion.
  • the coil winding 8 is arranged coaxially to the camshaft 2 or to the longitudinal center axis 14 of the camshaft 2 with a radial distance from the camshaft 2. Between the camshaft 2 and the coil winding 8, a small circumferential air gap 15 is realized, so that the camshaft 2 can rotate relative to the stationarily arranged coil winding 8. Alternatively, the camshaft can not be arranged coaxially but parallel to the camshaft 2.
  • the coil winding 8 are associated with a first and a second yoke portion 16, 17, which are formed annular disk-shaped and extending in the radial direction.
  • the two yoke sections 16, 17 are connected to one another in the axial direction by a, here hollow-cylindrical, magnetizable housing 18.
  • the first, yoke section 16, the second yoke section 17 and the housing 18 are separate, interconnected components, wherein in an alternative embodiment, at least one of the yoke sections 16, 17 may be integrally connected to the housing 18.
  • the magnetic flux extends from the radially inner end of the first yoke section 16 in the radial direction outwardly into the cylindrical housing 18, in this in the axial direction to the radially outer end of the second yoke portion 17 and then in the second yoke portion 17 radially inward, then bridges a second gap 19 between the second yoke portion 17 and the second axial portion , passes through the second axial portion substantially in the radial direction inwardly, then bridges the gap 13 towards the armature 7, extends in the armature 7 in the axial direction, then bridged again in the radial direction outwardly the gap 13 into the first axial section 9 and extends in this radially outwardly and bridges a first gap 20 between the first axial section 9 and the first y
  • a provision either away from the control partner or on the control partner to be done by means of, for example, a mechanical adjustment mechanism, in particular via a Spring mechanism (not shown).
  • a schematically illustrated axial stop 21 provided on the side facing away from the actuator 5 side of the armature 7.
  • the armature 7 is designed in several parts and comprises a sleeve portion 22 to which a bolt portion 23, for example by pressing, is fixed.
  • a bolt portion 23 In the bolt portion 23, a ball 24 is rotatably supported in a cage at the front, wherein the armature 7 is supported on the ball 24 axially on the adjusting partner 5.
  • the material region 11 was produced by build-up welding.
  • a camshaft body blank made of magnetizable material in the region of the current material region 11 was divided into two separate axial sections, which now form the first and second axial section 9, 10.
  • These two axial sections were fixedly joined together by build-up welding of non-magnetizable material 11, ie by producing the material region 11, in a material-locking manner. It can be seen that the axial extent of the material region decreases from radially outward to radially inward, and that at least one oblique contact surface is formed on each axial section 9, 10 in order to increase the contact surfaces to the material region 11 and thus the strength of the system.
  • the magnetic separation between the two axial sections 9, 10 for example by providing as the material region 11 a ring of a non- or only difficult-to-magnetize material in order to separate the two separate, ie. later axial sections 9, 10 to connect with each other.
  • FIG. 2 essentially corresponds to the embodiment according to Fig. 1 , so as to avoid Repetitions below essentially only addresses the differences between the exemplary embodiments. With regard to the similarities between the embodiments is on Fig. 1 with associated figure description referenced.
  • the two axial sections 9, 10 are not completely separated magnetically, but next to the material region 11 is provided in the sectional view web-like connecting portion 25 radially inwardly, which is substantially annular and is arranged directly radially adjacent to the material region 11.
  • the radial extension, ie thickness extension of the connecting portion 25 is dimensioned so that upon energization of the coil winding 8 in the connecting portion 25, a magnetic saturation is achieved quickly, so that a resulting loss is minimized.
  • the main river runs like in Fig. 1 located.
  • the embodiment can be manufactured according to Fig. 2 in that a free space in the form of the present material region 11, for example by machining, is produced in a camshaft body blank and this clearance is then filled with the material forming the material region 11, in particular by build-up welding.
  • a solid ring insert made of non-hard or hardly magnetizable material, for example made of brass and preferably to connect this with two axial sections, for example by friction welding.
  • the advantage of the second embodiment over the first embodiment is increased mechanical stability. Furthermore, the problem does not arise that an alignment of the two camshaft sections must be ensured separately over the material range.
  • the adjusting partner 5 projects from the outside axially into the camshaft 2 as an example.
  • the control partner in particular a control valve for the camshaft adjustment such as in the EP 2 252 774 B1 shown completely inside the camshaft.

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

Claims (16)

  1. Ensemble d'arbre à cames, comportant un arbre à cames (2) comprenant un espace de réception (6) dans son intérieur, au moins partiellement en un matériau magnétisable, pour un moteur à combustion interne, et une unité de réglage électromagnétique (4) pour l'actionnement d'un partenaire de réglage (5), en particulier d'une soupape de commande d'un déphaseur d'arbre à cames (3), comprenant un enroulement de bobine (8) et une armature (7) déplaçable par alimentation en courant électrique de l'enroulement de bobine (8) pour coopérer avec le partenaire de réglage (5),
    caractérisé en ce que
    l'armature (7) est disposée au moins partiellement, de préférence complètement, à l'intérieur de l'arbre à cames (2) dans l'espace de réception (6) et l'enroulement de bobine (8) est disposé radialement à l'extérieur de l'arbre à cames (2) pour le déplacement sans contact de l'armature (7), et en ce que l'arbre à cames (2) comprend une première portion axiale (9) et une deuxième portion axiale (10), entre lesquelles est prévue une région de matériau (11) influençant le flux magnétique (12), afin d'augmenter le flux magnétique (12) à partir de l'une des portions axiales (9, 10), vers l'autre portion axiale (9, 10) respective par le biais de l'armature (7).
  2. Ensemble d'arbre à cames selon la revendication 1,
    caractérisé en ce que
    la région de matériau (11) est réalisée à partir d'un matériau qui n'est pas magnétisable ou au moins plus difficilement magnétisable que le matériau d'arbre à cames magnétisable.
  3. Ensemble d'arbre à cames selon l'une quelconque des revendications 1 et 2,
    caractérisé en ce que
    la première et la deuxième portion axiale (9, 10) sont reliées fixement l'une à l'autre mécaniquement par le biais de la région de matériau (11).
  4. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la première portion axiale (9) et la deuxième portion axiale (10) sont reliées par liaison de matière par le biais de la région de matériau (11).
  5. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la région de matériau (11) est obtenue par une transformation de structure, par exemple par un traitement thermique partiel de l'arbre à cames (2).
  6. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la région de matériau (11) est obtenue par remplissage, en particulier par rechargement par soudure, d'un espace libre entre la première et la deuxième portion axiale (9, 10) avec du matériau, en particulier à l'état chauffé, de préférence fluide, ou en prévoyant, de préférence en fixant, un élément annulaire séparé.
  7. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la première portion axiale (9) et la deuxième portion axiale (10) sont maintenues l'une contre l'autre exclusivement par le biais de la région de matériau (11), ou en ce que la première portion axiale (9) et la deuxième portion axiale (10) sont, dans une portion adjacente à la région de matériau (11), reliées par le biais d'une portion de liaison (25) réalisée de préférence sous forme de portion annulaire ou sont réalisées d'une seule pièce, laquelle portion de liaison est constituée du matériau de la première et de la deuxième portion axiale (9, 10).
  8. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la région de matériau (11) est réalisée avec une périphérie fermée.
  9. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'enroulement de bobine (8) entoure l'arbre à cames (2) et est disposé de manière coaxiale à l'arbre à cames (2) et à l'armature (7), ou en ce que l'enroulement de bobine (8) est disposé près de l'arbre à cames (2), de préférence de telle sorte qu'un axe d'enroulement de bobine s'étende parallèlement à l'arbre à cames (2).
  10. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'armature (7) est reçue dans l'arbre à cames (2) sur la majeure partie de son étendue axiale, de préférence entièrement, et/ou en ce que le partenaire de réglage (5) est reçu au moins partiellement dans l'arbre à cames (2), de préférence pénètre axialement dans celui-ci.
  11. Ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'étendue axiale de la région de matériau (11) est différente sur son étendue radiale, de préférence en ce que l'étendue axiale diminue au fur et à mesure que la distance radiale à l'armature (7) devient plus petite.
  12. Procédé de fabrication d'un ensemble d'arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'une région de matériau (11) influençant le flux magnétique (12) est prévue entre une première portion axiale (9) et une deuxième portion axiale (10) d'un arbre à cames (2), afin d'augmenter le flux magnétique (12) à partir de l'une des portions axiales (9, 10), vers l'autre portion axiale (9, 10) respective par le biais d'une armature (7) pouvant être reçue dans l'arbre à cames (2).
  13. Procédé selon la revendication 12,
    caractérisé en ce que
    la région de matériau (11) est obtenue par une transformation de structure, par exemple par un traitement thermique partiel de l'arbre à cames (2).
  14. Procédé selon l'une quelconque des revendications 12 et 13,
    caractérisé en ce que
    la région de matériau (11) est obtenue par remplissage, en particulier par rechargement par soudure, d'un espace libre entre la première et la deuxième portion axiale (9, 10) avec du matériau, en particulier à l'état chauffé, de préférence fluide.
  15. Procédé selon la revendication 14,
    caractérisé en ce que
    la fabrication de l'espace libre s'effectue lors du même serrage que le remplissage de l'espace libre.
  16. Bloc-moteur comprenant un ensemble d'arbre à cames selon l'une quelconque des revendications 1 à 11, dans lequel de préférence l'arbre à cames (2) et/ou l'armature (7) et/ou l'enroulement de bobine (8) est/sont disposé(e)(s) à l'intérieur du bloc-moteur.
EP20120713896 2011-03-18 2012-03-12 Ensemble d'arbre a cames et son procede de fabrication Active EP2649281B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110001420 DE102011001420A1 (de) 2011-03-18 2011-03-18 Nockenwellenbaugruppe sowie Verfahren zum Herstellen einer Nockenwellenbaugruppe
PCT/EP2012/054234 WO2012126756A1 (fr) 2011-03-18 2012-03-12 Ensemble arbre à cames ainsi que procédé de fabrication d'un ensemble arbre à cames

Publications (2)

Publication Number Publication Date
EP2649281A1 EP2649281A1 (fr) 2013-10-16
EP2649281B1 true EP2649281B1 (fr) 2015-05-06

Family

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Application Number Title Priority Date Filing Date
EP20120713896 Active EP2649281B1 (fr) 2011-03-18 2012-03-12 Ensemble d'arbre a cames et son procede de fabrication

Country Status (4)

Country Link
US (1) US8931450B2 (fr)
EP (1) EP2649281B1 (fr)
DE (1) DE102011001420A1 (fr)
WO (1) WO2012126756A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005010369D1 (de) 2004-05-14 2010-11-25 Schaeffler Kg Nockenwellenversteller
DE102006031517A1 (de) 2006-07-07 2008-01-10 Schaeffler Kg Schalteinrichtung für eine druckölbetätigte Nockenwellenstellvorrichtung, sowie Montageverfahren zum Einbau derselben in eine Brennkraftmaschine
JP2009222036A (ja) * 2008-03-19 2009-10-01 Hitachi Ltd 内燃機関のバルブタイミング制御装置
JP2010190060A (ja) 2009-02-16 2010-09-02 Toyota Motor Corp 作動液供給構造
DE202009004611U1 (de) * 2009-04-03 2010-08-12 Eto Magnetic Gmbh Elektromagnetische Nockenwellen-Verstellvorrichtung

Also Published As

Publication number Publication date
EP2649281A1 (fr) 2013-10-16
US8931450B2 (en) 2015-01-13
US20140007828A1 (en) 2014-01-09
WO2012126756A1 (fr) 2012-09-27
DE102011001420A1 (de) 2012-09-20

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