US20170314427A1 - Method for producing an adjustable camshaft and adjustable camshaft - Google Patents

Method for producing an adjustable camshaft and adjustable camshaft Download PDF

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Publication number
US20170314427A1
US20170314427A1 US15/521,340 US201515521340A US2017314427A1 US 20170314427 A1 US20170314427 A1 US 20170314427A1 US 201515521340 A US201515521340 A US 201515521340A US 2017314427 A1 US2017314427 A1 US 2017314427A1
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US
United States
Prior art keywords
cam
fixed
outer shaft
shaft segment
inner shaft
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Abandoned
Application number
US15/521,340
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English (en)
Inventor
Henning Brandenburger
Alexander Paeplow
Alexander Lübberstedt
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Thyssenkrupp Dynamic Components Teccenter AG
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ThyssenKrupp Presta TecCenter AG
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Publication of US20170314427A1 publication Critical patent/US20170314427A1/en
Assigned to THYSSENKRUPP PRESTA TECCENTER AG reassignment THYSSENKRUPP PRESTA TECCENTER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRANDENBURGER, Henning, LÜBBERSTEDT, Alexander, PAEPLOW, Alexander
Abandoned legal-status Critical Current

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    • 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
    • F01L1/34413—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 composite camshafts, e.g. with cams being able to move relative to the camshaft
    • 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
    • F01L13/0057—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 by splittable or deformable cams
    • 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
    • F01L2103/02—
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/02—Initial camshaft settings

Definitions

  • the present invention concerns a method for producing an adjustable camshaft of a motor vehicle. Moreover, the invention concerns an adjustable camshaft of a motor vehicle with at least one fixed cam arranged rotationally fixed on at least one outer shaft segment and at least one adjusting cam arranged rotationally fixed to an inner shaft extending concentrically within the outer shaft segment.
  • Adjustable camshafts basically find application in valve-controlled internal combustion engines, for example, and serve for the specific influencing of the control timing of the valves of the engine in regard to its development of torque and power, the fuel consumption, and the exhaust gas emission.
  • adjustable camshafts are designed so that the camshaft comprises an outer shaft and an inner shaft arranged coaxially in this outer shaft.
  • the outer shaft as well as the inner shaft can rotate relative to each other by means of a displacement mechanism, for example.
  • cam elements connected to the outer shaft as well as cam elements connected to the inner shaft
  • cam elements of the outer shaft are arranged rotationally fixed on the outer shaft
  • cam elements of the inner shaft are arranged rotationally fixed on the inner shaft and movably on the outer shaft, so that when the outer shaft rotates relative to the inner shaft the cam elements connected to the outer shaft are also rotated relative to the cam elements connected to the inner shaft.
  • a rotating of the inner shaft relative to the outer shaft or the outer shaft to the inner shaft is made possible, as is known, by means of a phase shifter, so that a phase shift is advantageously achieved for the valve control timing or the opening duration of the valves can also be varied.
  • the inner shaft cam elements usually have slots in which corresponding connection elements of the inner shaft or connection elements which can be connected to the inner shaft can be inserted.
  • connection elements may be, for example pins, bolts, or also screws.
  • German patent application DE197575404A1 discloses a corresponding camshaft with a connection element designed in the shape of a cylindrical pin.
  • This cylindrical pin is inserted by press fitting into a through bore of the inner shaft and by means of loose fitting into the corresponding cams.
  • the corresponding cams have an outwardly projecting cylindrical region having a bore in which the cylindrical pin is inserted.
  • this requires a prior machining of the cam in order to connect it to the connection element of the inner shaft.
  • Such a prior machining of the cam element increases the manufacturing cost, and the manufacturing costs for the production of an adjustable camshaft layout.
  • the problem which the present invention proposes to solve is to eliminate at least some of the above-described drawbacks in an adjustable camshaft of a motor vehicle as well as those in a method for producing such an adjustable camshaft of a motor vehicle.
  • the problem which the present invention proposes to solve is to provide a simple and economical method for the production of an adjustable camshaft, as well as an adjustable camshaft of a motor vehicle which can be produced in a simple and economical manner.
  • the method for producing an adjustable camshaft of a motor vehicle comprises at least one fixed cam arranged rotationally fixed on at least one outer shaft segment and at least one adjusting cam arranged rotationally fixed to an inner shaft extending concentrically within the outer shaft segment, comprises at least the following steps:
  • the adjustable camshaft according to the invention comprises an inner shaft which is adjustable and especially rotatable relative to the outer shaft, being arranged concentrically or coaxially to the outer shaft.
  • the inner shaft lies inside the outer shaft, which is designed for example in the form of a tube and accordingly comprises a through bore, through which the inner shaft extends for at least a portion.
  • the outer shaft comprises at least one outer shaft segment, which is consequently in the form of a segment of the outer shaft and accordingly forms a tube segment not extending entirely along the longitudinal axis of the inner shaft.
  • the adjustable camshaft furthermore comprises at least one fixed cam as well as at least one adjusting cam, the fixed cam being arranged rotationally fixed to the outer shaft and especially to the outer shaft segment, while the adjusting cam is arranged rotationally fixed to the inner shaft. Consequently, upon rotation of the outer shaft relative to the inner shaft, the fixed cam will turn relative to the adjusting cam, so that consequently there will occur a spreading in terms of the angle between adjusting cam and the fixed cam.
  • the adjustable camshaft mentioned here finds application advantageously in the field of automotive engineering, wherein motor vehicles in the context of the invention can mean in particular land, air and water vehicles.
  • the adjustable camshaft can be used in the field of automotive engineering and especially in the field of gasoline and diesel engine technology.
  • the adjustable camshaft serves advantageously to optimize the charge cycle and make possible a variable compression ratio by a variation of the intake valve; and to reduce pollutant and CO 2 emission. Furthermore, it is conceivable for the adjustable camshaft to be used to regulate the variable valve control timing settings between intake and exhaust valve.
  • the adjustable camshaft is used to optimize the mixture formation in injection type engines by increasing the charge mobility in the combustion space based on a specific phase shift of the intake valves, as well as reduce pollution emissions of the cold start phase of the internal combustion engine by cat-heating, for example by an early opening of the exhaust valve.
  • it is also conceivable to use such an adjustable camshaft advantageously to control the exhaust gas aftertreatment system such as the particle regeneration filter by an exhaust-side variability, or to control the exhaust gas turbocharging system by a corresponding exhaust-side variability.
  • the adjustable camshaft advantageously serves to enable the variability in the opening duration of the valve lifting, making possible a continuous opening duration of the entire cam profile, extending over the fixed cam and the adjusting cam, by means of a spreading of the adjusting cam relative to the fixed cam.
  • the valve tapping element which is a roller cam follower for example, makes contact in the first part of the valve lifting curve with the profile of the cam, while after the transition point the contact changes to the plateau-shaped profile of the adjusting cam.
  • a displacement of such a camshaft and especially the inner shaft relative to the outer shaft is advantageously made possible by means of a phase shifter and especially a dual-phase or a double-phase shifter.
  • an outer shaft segment is advantageously arranged on and in particular shoved onto an inner shaft. Later on in time, it is possible to generate an arranging section on the surface of the inner shaft, the surface of the inner shaft being modified or altered. Subsequent to the surface modification of the surface of the inner shaft for generating an arranging section, according to the invention the fixed cam is arranged on at least one portion of the outer shaft segment and the adjusting cam on the arranging section of the inner shaft.
  • the above-mentioned steps it is furthermore conceivable for the above-mentioned steps to also have a sequence varying in relation to each other.
  • the fixed cam itself to be positioned even before the generating of the surface modification of the inner shaft on at least a portion of the outer shaft segment or to be connected to it or arranged on it. It is furthermore conceivable to generate the surface modification of the inner shaft before the arranging of an outer shaft segment on the inner shaft.
  • the surface modification of the inner shaft to be used for a frictional and/or form-fitting and/or bonded connection of the adjusting cam to the camshaft, in order to join the adjusting cam especially in the region of the arranging section of the inner shaft to this inner shaft in a rotationally fixed manner, so that upon rotation of the inner shaft relative to the outer shaft the torque can be transmitted to the adjusting cam, so that the latter turns uniformly with the inner shaft about the central axis of rotation of the inner shaft.
  • the outer shaft segment being in the form of a tube segment or a hollow shaft segment, is shoved onto the inner shaft, which is advantageously configured as a solid shaft, so that the outer shaft segment encloses the inner shaft at least for a portion. Consequently, the inner shaft is arranged centrally, preferably coaxially or concentrically, in the outer shaft.
  • the surface of the inner shaft is modified such that it comprises elevations of its own material especially in the arranging section. This advantageously avoids an additional arranging, introducing, or connecting of holding means or materials on the inner shaft and/or the adjusting cam, which are designed to connect the adjusting cam to the inner shaft.
  • the material elevation is generated by means of rolling.
  • a chipless machining is done with a rolling body, which serves to smooth and strengthen the material surfaces.
  • a rolling tool is pressed with such force against the rotating inner shaft that the material of the inner shaft begins to flow, so that it is displaced accordingly.
  • the rolling process is carried out by means of tools, such as rolling disks, which have a roughened working surface.
  • a cam is shoved onto the inner shaft, advantageously having a through bore through which the inner shaft can extend, there will consequently be at least one frictional connection between the cam and the inner shaft and especially the modified surface of the inner shaft at least in the region of the arranging section having a surface modification.
  • the fixed cam itself to have a through bore, being larger in diameter than the diameter of the through bore of the adjusting cam, in order to consequently be shoved across the surface modification of the surface of the inner shaft without creating for example a frictional connection between the fixed cam and the inner shaft.
  • the fixed cam and the adjusting cam it would also be conceivable for the fixed cam and the adjusting cam to have substantially comparable through bore diameters, in which case it would be necessary for the fixed cam to be at least shoved onto the inner shaft prior to generating the surface modification of the inner shaft and furthermore advantageously to be arranged on the outer shaft segment.
  • the fixed cam it is advantageously possible for the fixed cam to be joined force-fitted to the outer shaft segment and especially to a distal end of the outer shaft segment.
  • the arrangement of the fixed cam with the outer shaft segment it is also conceivable for the arrangement of the fixed cam with the outer shaft segment to be done by a form fitting and/or a bonded connection.
  • the fixed cam will be shoved across at least one portion of the outer shaft segment, the fixed cam advantageously having a through bore diameter which corresponds substantially to the outer diameter of the outer shaft segment, in order to create advantageously a press fit connection between the outer shaft segment and the fixed cam.
  • the outer shaft segment can have an insertion region, which can be designed in the form of an insert bevel, a shoulder, or a recess or the like.
  • This insertion region advantageously serves to connect the fixed cam via this insertion region in a rotationally fixed manner to the outer shaft segment.
  • the insertion region, especially a portion of this insertion region furthermore itself also serves as a limiting region in order to prevent a further or inadvertent excessive shoving of the fixed cam on the outer shaft segment.
  • the adjustable camshaft comprises at least two fixed cams, each connected to an outer shaft segment, and an adjusting cam arranged between the fixed cams and connected in a rotationally fixed manner to the inner shaft. Consequently, a cam pack having a cam profile itself consists of more than one fixed cam and one adjusting cam, namely, advantageously of at least two fixed cams and one adjusting cam, which is arranged between the two fixed cams. Consequently, it is conceivable for a further fixed cam to be arranged adjacent to the adjusting cam and for a further outer shaft segment to be arranged adjacent to the further fixed cam on the inner shaft, the further fixed cam being arranged on the further outer shaft segment and being connected to it in particular in a rotationally fixed manner.
  • the construction or assembly of the adjustable camshaft is accordingly done in modular fashion, in particular thanks to the advantageous modular design of the outer shaft, which consists of at least one outer shaft module and advantageously of one, two or more outer shaft segments.
  • the fixed cam or the two fixed cams of a cam pack are connected at least by force-fit or by form fit or by bonding to the outer shaft segment.
  • the fixed cam it is also conceivable for the fixed cam to be joined force-fitted and by form fit and by bonding to the outer shaft segment.
  • the connection between the adjusting cam and the inner shaft segment which can likewise be joined at least force-fitted or by form fit or by bonding to the inner segment.
  • the adjusting cam is connected force-fitted via the material elevation to the inner shaft.
  • a frictional connection between the connection cam and the outer shaft segment as well as the adjusting cam and the inner shaft enables an easy and economical fabrication and assembly of an adjustable camshaft for motor vehicles.
  • an adjustable camshaft of a motor vehicle which comprises at least one fixed cam arranged rotationally fixed on an outer shaft segment and at least one adjusting cam arranged rotationally fixed to an inner shaft extending concentrically within the outer shaft segment, wherein the adjusting cam is at least force-fitted connected to an arranging section of the inner shaft extending for at least a portion along the inner shaft, wherein the arranging section comprises a surface modification of the surface of the inner shaft.
  • the outer shaft segment is advantageously designed in the form of a tube segment with a shell surface and a through bore, through which the camshaft extends for at least a portion.
  • the inner shaft is advantageously a cylindrical rod-shaped element, especially advantageously a solid shaft, which extends for at least a portion through the through bore of the outer shaft segment.
  • the adjusting cams can be arranged able to rotate or move relative to the fixed cams in order to alter a cam profile of a cam pack from at least one fixed cam and at least one adjusting cam.
  • the adjusting cam as well as the fixed cam advantageously each comprises a through bore, through which at least a portion of the inner shaft extends.
  • the fixed cam comprises a through bore dimensioned such that at least the outer shaft segment can also extend for a portion through this through bore or can at least extend for a portion into the through bore.
  • the adjusting cam it is conceivable for the adjusting cam to be placed between two fixed cams, which are designed as single fixed cam elements or as a combined fixed cam element in a double anvil design.
  • double anvil design is meant in the context of the invention a design of the fixed cams in which the fixed cams have a common base region, through which the through bore extends, while the cam lifting region of the fixed cams is designed in particular at a spacing from each other. Consequently, between these two fixed cams joined together in the base region there is provided a recess, inside which the adjusting cam is introduced.
  • the fixed cam or the fixed cams and the adjusting cam advantageously lie concentric to each other, so that upon a rotation of the fixed cams to the adjusting cam or of the adjusting cam to the fixed cams there occurs a rotation of the cams about an identical axis.
  • the fixed cams and the adjusting cam form a combined cam profile, which can be varied based on the relative rotary movement between the fixed cams and the adjusting cam.
  • the adjusting cam and especially the adjusting cam contour makes contact with a tapping element interacting accordingly with the respective cam contour, such as a cam follower for the transfer of the rotary movement of the camshaft into a translatory movement for the control of the valves, insofar as the adjusting cam is turned relative to the fixed cams and the cam contour of the adjusting cam is consequently displaced relative to the cam contour of the fixed cam or the fixed cams or takes up a changed position.
  • a tapping element interacting accordingly with the respective cam contour, such as a cam follower for the transfer of the rotary movement of the camshaft into a translatory movement for the control of the valves
  • the surface modification of the surface of the inner shaft is a material elevation, which is generated for example by means of the rolling method.
  • the adjusting cam it is conceivable for the adjusting cam to be joined to the inner shaft by means of a pressing on and especially by means of a frictional connection in the arranging section, so that upon rotation of the inner shaft a rotation of the adjusting cam also occurs.
  • the camshaft in the context of the invention, it is possible for the camshaft to comprise at least two outer shaft segments, on each of which a fixed cam is arranged in a rotationally fixed manner. Consequently, the adjusting cam is advantageously enclosed by the two fixed cams and accordingly by outer shaft segments connected to the fixed cams.
  • the outer shaft segment in the context of the invention, it is furthermore conceivable for the outer shaft segment to have at least one distal shell surface region whose outer diameter is smaller in dimension for at least a portion than an outer diameter of the remaining shell surface.
  • the outer shaft segment comprises an insertion region at least at one of the distal ends and advantageously at both distal ends in the region of the shell surface. This insertion region serves advantageously for shoving the fixed cam at least for a portion onto the outer shaft segment and advantageously onto a portion.
  • the insertion region is designed advantageously in the form of a substantially continually decreasing or increasing insert bevel, a diameter constriction, a recess, a shoulder, or a comparable geometrical form by means of which an outer diameter of smaller dimension is formed in the insertion region at least for a portion, than in the remaining outer shaft segment. It is moreover conceivable for the length of these insertion regions or this insertion region, looking in the longitudinal direction of the outer shaft segment, to correspond substantially to the width of the fixed cam, so that the fixed cam can be arranged advantageously entirely, but at least almost entirely on this insertion region and be joined by it to the outer shaft segment advantageously in a rotationally fixed manner.
  • the adjusting cam and the fixed cam are arranged concentric to each other and for the through bore of the fixed cam to be larger in dimension than the through bore of the adjusting cam.
  • the through bore of the adjusting cam is roughly the same in dimension as the outer diameter or the circumferential diameter of the inner shaft.
  • the through bore of the fixed cam is larger in dimension than the outer diameter or the circumferential diameter of the inner shaft and especially advantageously larger than the outer diameter of the material elevation or rolling, in order to enable a rolling of the fixed cam across the material elevation of the inner shaft during the assembly process.
  • the through bore of the fixed cam is at most identical to the outer diameter or the circumferential diameter of the outer shaft segment, in order to enable a secure arrangement of the fixed cam on the outer shaft segment, especially by means of a press fit, advantageously by generating a frictional connection. Thanks to the use of a frictional connections between the fixed cam and the outer shaft segment as well as between the adjusting cam and the inner shaft, an easy and economical as well as a reliable fabrication and a durable use of the adjustable camshaft is possible.
  • FIG. 1 in a perspective view, one embodiment of an adjustable camshaft
  • FIG. 2 in a cross sectional side view, one embodiment of an adjustable camshaft according to the invention
  • FIG. 3 in a cross sectional side view, an enlargement of cutout C, as shown in FIG. 2 ,
  • FIG. 4 in a perspective view, one embodiment of a cam pack of an adjustable camshaft according to the invention
  • FIG. 5 in a cross sectional side view, one embodiment of a cam pack of a camshaft according to the invention
  • FIG. 6 in a perspective view, a cutout from one embodiment of a camshaft according to the invention, showing a cam pack in a first arranging and
  • FIG. 7 in a perspective view the cutout shown in FIG. 7 for the camshaft according to the invention, in a second arranging of the cam pack.
  • FIG. 1 shows in a perspective view one embodiment of an adjustable camshaft 1 according to the invention.
  • the camshaft 1 comprises an inner shaft 2 as well as two outer shaft segments 3 . 1 and 3 . 2 .
  • Each outer shaft segment 3 . 1 , 3 . 2 comprises at least one insertion region 10 , being formed on a distal shell surface region 12 .
  • the fixed cams 7 . 1 , 7 . 2 are part of a cam pack 4 . 1 , 4 . 2 , it being conceivable for the camshaft 1 to have a plurality of such cam packs 4 . 1 , 4 . 2 .
  • Each cam pack 4 . 1 , 4 . 2 comprises a first fixed cam 7 .
  • the inner shaft 2 extends through the through bore of the fixed cam B F , shown in FIG. 1 , as well as through a through bore of the adjusting cam 8 , not shown here, and through a corresponding through bore of the outer shaft segments 3 . 1 and 3 . 2 , not shown here.
  • the arrangement of the fixed cams 7 . 1 , 7 . 2 and the adjusting cam 8 will be explained in particular in FIGS. 2 and 3 .
  • FIGS. 2 and 3 show in a side view a cross sectional representation of one embodiment of the adjustable camshaft 1 according to the invention, FIG. 3 showing a magnified representation of the region C shown in FIG. 2 .
  • the section shown in FIG. 2 and of one embodiment of a camshaft 1 according to the invention comprises at least one cam pack 4 , having a first fixed cam 7 . 1 and a second fixed cam 7 . 2 as well as an adjusting cam 8 arranged between the fixed cams 7 . 1 and 7 . 2 .
  • the through bore B F of the fixed cams 7 . 1 and 7 . 2 comprises a larger diameter than the through bore B V of the adjusting cam 8 .
  • the two outer shaft segments 3 . 1 and 3 . 2 advantageously have an insertion region 10 at both distal ends 12 and especially at the distal shell surface regions 12 .
  • This insertion region can be designed, for example, in the form of a shoulder, an insert bevel, a recess or slot, or a comparable form geometrically changing the shell surface.
  • the outer diameter and especially the circumferential diameter of the outer shaft segments 3 . 1 and 3 . 2 comprises a smaller diameter in the region of the insertion regions 10 , as indicated by the reference Da, than in the remaining region of the outer shaft segment, as indicated by the reference Db.
  • the shape and size or geometrical configuration of the insertion regions 10 will not be limited to a particular geometrical shape in the context of the invention. Instead, it should be noted that the insertion regions 10 are designed such as to advantageously ensure a frictional connection between the fixed cams 7 . 1 and 7 . 2 and the respective outer shaft segments 3 . 1 and 3 . 2 .
  • the insertion region 10 of the respective outer shaft segment 3 . 1 or 3 . 2 also serves to prevent too far a placement or shoving of the cam pack 4 or the fixed cam 7 . 1 or 7 . 2 of the cam pack 4 onto the outer shaft segment 3 . 1 or 3 . 2 .
  • first shove or mount the outer shaft segment 3 . 1 or 3 . 2 onto the inner shaft 2 before a rolling of the inner shaft 2 and especially a surface treatment of the inner shaft 2 to generate a surface modification 20 takes place.
  • the method for creating the camshaft according to the invention to first shove a first outer shaft segment 3 . 1 onto an inner shaft 2 , which is accommodated for example in a chuck on an automatic cam placing machine. After this, the rolling of the inner shaft 2 could occur, in order to create a material elevation 20 on the surface of the inner shaft 2 .
  • a frictional connection is produced between the first fixed cam 7 . 1 and the first outer shaft segment 3 . 1 as well as the adjusting cam 8 and the surface modification 20 or the material elevation 20 of the inner shaft 2 .
  • a second outer shaft segment 3 . 2 it would be conceivable for a second outer shaft segment 3 . 2 to be shoved onto the inner shaft 2 and this far enough into the region of the cam pack 4 onto the inner shaft 2 so that in particular the insertion region 10 is force-fitted connected to the second fixed cam 7 . 2 of the cam pack 4 .
  • FIG. 4 shows in perspective view an embodiment of a cam pack 4 , being an element of the adjustable camshaft 1 according to the invention.
  • the cam pack 4 comprises a first fixed cam 7 . 1 and a second fixed cam 7 . 2 , enclosing the adjusting cam 8 .
  • the adjusting cam 8 advantageously comprises an identical cam contour to the fixed cams 7 . 1 and 7 . 2 and is mounted concentrically to the fixed cams 7 . 1 and 7 . 2 , so that upon movement of the adjusting cam 8 relative to the fixed cams 7 . 1 and 7 . 2 a rotation of the cams 7 . 1 , 7 . 2 , 8 about a common axis of rotation D, as shown in particular in FIG. 4 , can occur.
  • the adjusting cam 8 is designed to be movable relative to the fixed cams 7 . 1 and 7 . 2 .
  • the through bore B F of the fixed cam 7 . 1 or 7 . 2 as well as the through bore B V of the adjusting cam 8 each comprises—at least for a portion—a structured surface 30 or 31 , which can be designed identical to each other or also different from each other. Based on this structured surface 30 , 31 , a frictional connection is optimized between the fixed cams 7 . 1 , 7 . 2 and the surfaces of the outer shaft segments 3 . 1 and 3 . 2 as well as between the adjusting cam 8 and the surface of the inner shaft 2 , as shown for example in FIGS. 1 to 3 .
  • the fixed cams 7 . 1 and 7 . 2 are advantageously joined together in their base region 7 . 3 and consequently form a fixed cam consisting of two cam profiles.
  • Such an arrangement of fixed cams with respect to each other is also called a double anvil in the context of the invention. Consequently, a recess is formed between the cam contours of the individual fixed cams 7 . 1 and 7 . 2 , which are spaced apart from each other, in which the adjusting cam 8 is encompassed.
  • at least the fixed cam 7 . 1 or 7 is advantageously joined together in their base region 7 . 3 and consequently form a fixed cam consisting of two cam profiles.
  • Such an arrangement of fixed cams with respect to each other is also called a double anvil in the context of the invention. Consequently, a recess is formed between the cam contours of the individual fixed cams 7 . 1 and 7 . 2
  • a sleeve (not shown here), and this sleeve is or can be operatively connected at least to one outer shaft segment 3 . 1 or 3 . 2 or to the inner shaft 2 , advantageously making use of a frictional connection.
  • FIG. 5 shows schematically in a side view a cross sectional representation of one embodiment of a cam pack 4 .
  • the cam pack 4 shown in FIG. 5 advantageously comprises a first fixed cam 7 . 1 and a second fixed cam 7 . 2 , not shown here, between which is arranged an adjusting cam 8 .
  • the adjusting cam 8 comprises a through bore B V , which is smaller in dimension than the through bore B F of the fixed cam 7 . 1 or 7 . 2 .
  • the fixed cam 7 . 1 or 7 . 2 or the fixed cam element designed as a double anvil can be moved about an axis of rotation D identical to the adjusting cam 8 , so that consequently the fixed cams 7 . 1 , 7 .
  • the adjusting cam 8 comprises a clearance 11 , inside which runs the transition region 7 . 4 of the base region 7 . 3 of the double-anvil fixed cam. Based on the clearance 11 of the adjusting cam 8 , a rotation of the adjusting cam 8 relative to the fixed cam 7 . 1 or 7 . 2 is possible.
  • this clearance 11 also serves for mounting the inner shaft 2 in at least one of the outer shaft segments 3 . 1 , 3 . 2 .
  • FIG. 6 shows schematically in a perspective view a cutout of an embodiment of a camshaft 1 according to the invention with a cam pack 4 in a first arranging, in which the adjusting cam 8 comprises undergone no rotary movement relative to the fixed cam 7 . 1 or 7 . 2 . Consequently, the cam pack 4 comprises a flat cam contour.
  • the cam pack 4 experiences a spreading of the adjusting cam 8 relative to the fixed cams 7 . 1 and 7 . 2 , as shown especially in FIG. 7 . Based on the spreading, the cam profile of the entire cam pack 4 is consequently changed, by which a tapping element controls the setting or adjusting of intake and/or exhaust valves.
  • the method according to the invention for the production of an adjustable camshaft as well as an adjustable camshaft of a motor vehicle according to the invention advantageously produced with the method of the invention will enable a production or fabrication and assembly of an adjustable camshaft in an easier and more economical manner.
  • a connection element such as a pin
  • the method according to the invention makes possible a production or assembly of the adjustable camshaft in a single layout, the individual elements, namely the inner shaft as well as the outer shaft segments, the cam pack with the fixed cams and the adjusting cam being able to be mounted in a common layout.
  • ground cams and especially ground fixed cams and ground adjusting cams can be installed by means of the method according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
US15/521,340 2014-10-24 2015-09-30 Method for producing an adjustable camshaft and adjustable camshaft Abandoned US20170314427A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014015649.4 2014-10-24
DE102014015649.4A DE102014015649A1 (de) 2014-10-24 2014-10-24 Verfahren zum Herstellen einer verstellbaren Nockenwelle und verstellbare Nockenwelle
PCT/EP2015/072588 WO2016062511A1 (de) 2014-10-24 2015-09-30 Verfahren zum herstellen einer verstellbaren nockenwelle und verstellbare nockenwelle

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US20170314427A1 true US20170314427A1 (en) 2017-11-02

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US15/521,340 Abandoned US20170314427A1 (en) 2014-10-24 2015-09-30 Method for producing an adjustable camshaft and adjustable camshaft

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US (1) US20170314427A1 (zh)
EP (1) EP3209869A1 (zh)
JP (1) JP2017535711A (zh)
KR (1) KR20170072910A (zh)
CN (1) CN107075978A (zh)
DE (1) DE102014015649A1 (zh)
WO (1) WO2016062511A1 (zh)

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CN107476840A (zh) * 2017-09-22 2017-12-15 绵阳深度数控科技有限公司 凸轮轴装配结构和凸轮轴装配工艺
DE102018114584A1 (de) * 2018-06-18 2019-12-19 Thyssenkrupp Ag Ventiltriebsystem für eine Brennkraftmaschine und Verfahren zur Steuerung eines Ventiltriebs einer Brennkraftmaschine

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US20060107913A1 (en) * 2004-11-20 2006-05-25 Mahle Ventiltrieb Gmbh Camshaft for automotive engines in particular
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US5307708A (en) * 1991-07-03 1994-05-03 Etablissement Supervis Camshaft for controlling valves in internal combustion engines
US5664463A (en) * 1993-03-03 1997-09-09 Amborn; Peter Camshaft assembly with shaft elements positioned one inside the other and method of producing same
US20060107913A1 (en) * 2004-11-20 2006-05-25 Mahle Ventiltrieb Gmbh Camshaft for automotive engines in particular
US20090084333A1 (en) * 2007-09-27 2009-04-02 Gm Global Technology Operations, Inc. Method and apparatus for continuously variable differential phasing of engine valve operation
US20110023802A1 (en) * 2007-10-16 2011-02-03 Magna Powertrain Inc. Concentric Phaser Camshaft and a Method of Manufacture Thereof
US20120260873A1 (en) * 2009-09-16 2012-10-18 Thyssenkrupp Presta Teccenter Ag Camshaft with Variable Valve Opening Period
US20140174386A1 (en) * 2011-06-15 2014-06-26 Schaeffler Technologies AG & Co. KG Phase-adjusting device of a camshaft for an internal combustion engine
US20130284132A1 (en) * 2012-04-26 2013-10-31 Hitachi Automotive Systems, Ltd. Variable valve actuating apparatus for internal combustion engine
US20150174713A1 (en) * 2013-12-20 2015-06-25 Hyundai Motor Company Apparatus for assembling overhead camshaft
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DE102014015649A1 (de) 2016-04-28
WO2016062511A1 (de) 2016-04-28
EP3209869A1 (de) 2017-08-30
KR20170072910A (ko) 2017-06-27
JP2017535711A (ja) 2017-11-30
CN107075978A (zh) 2017-08-18

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