WO2009067789A1 - Arbre à cames concentrique avec entraînement de phase électrique - Google Patents

Arbre à cames concentrique avec entraînement de phase électrique Download PDF

Info

Publication number
WO2009067789A1
WO2009067789A1 PCT/CA2008/002058 CA2008002058W WO2009067789A1 WO 2009067789 A1 WO2009067789 A1 WO 2009067789A1 CA 2008002058 W CA2008002058 W CA 2008002058W WO 2009067789 A1 WO2009067789 A1 WO 2009067789A1
Authority
WO
WIPO (PCT)
Prior art keywords
control shaft
camshaft
drive sprocket
drive
electric phase
Prior art date
Application number
PCT/CA2008/002058
Other languages
English (en)
Inventor
Adrian Constantin Cioc
Darrell F. Greene
Original Assignee
Magna Powertrain Inc.
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 Magna Powertrain Inc. filed Critical Magna Powertrain Inc.
Publication of WO2009067789A1 publication Critical patent/WO2009067789A1/fr

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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • 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
    • F01L1/34—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
    • F01L1/34—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
    • F01L1/352—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 bevel or epicyclic 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
    • 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
    • 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
    • F01L1/053—Camshafts overhead type
    • F01L2001/0535—Single overhead camshafts [SOHC]
    • 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
    • F01L2001/054—Camshafts in cylinder block
    • 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
    • F01L2820/032—Electric motors

Definitions

  • the present invention relates to a concentric camshaft with electric phase drive. More specifically, the present invention relates to a concentric camshaft with electric phase drive for altering the phasing of the timing of valves actuated by the concentric camshaft.
  • Variable valve timing is now increasingly employed with internal engines to improve their fuel efficiency and/or performance.
  • the angular positions of the cam lobes actuating the valves of the engine are fixed with respect to the angular position of the crankshaft, the camshaft being rotated at precisely one-half the speed of the crankshaft by a synchronous drive.
  • the valves of the engine always open and close at the same position with respect to the position of their respective pistons.
  • the angular position of the cam lobes can be altered, with respect to the angular position of the crankshaft, thus allowing the valves to be opened and/or closed sooner or later with respect to a given piston position.
  • variable valve phasing the angular position of the inlet valve camshaft, relative to the crankshaft, can be altered independently of the angular position of the exhaust camshaft, relative to the crankshaft.
  • the difference between the angular positions of the camshafts to the crankshaft is typically referred to as the "phase" of the valves and the drive mechanisms which advance or retard the angular position of the camshafts relative to the crankshaft are typically referred to as phase drives.
  • the phase drive operates between a drive pulley, attached to a synchronous drive driven by the engine crankshaft, and the camshaft.
  • the phase drives are operated by a supply of pressurized lubrication oil which is modulated, as need, by a valve timing controller to alter the angular position of the camshaft relative to the drive pulley and thus relative to the crankshaft.
  • increasing the supply of pressurized lubrication fluid advances the angular position of a cam relative to the drive pulley and decreasing the supply of pressurized lubrication fluid retards the angular position of a cam relative to the drive pulley.
  • variable valve phasing offers numerous improvements to the operation of an engine, it still suffers from some disadvantages.
  • engines do not typically have a sufficient available supply of pressurized lubricating oil when they are being started and/or at low operating speed, and thus valve phase drives cannot be operated as desired.
  • a planetary gear is placed between an outer gear on the drive pulley and an inner gear driving the camshaft.
  • the planetary gear is rotatably mounted to a drive shaft which can, in turn, be rotated by an electric motor. Rotation of the planetary gear by the electric motor changes the speed of rotation of the inner gear, relative to the outer gear, to advance or retard the angular position of the camshaft with respect to the drive pulley.
  • the valve timing can be set, as desired, even at start up and at low operating speeds of the engine.
  • Camshafts for such systems are generally referred to as concentric camshafts, or concentric phasing camshafts, and typically include a concentrically arranged outer member and inner member.
  • a set of lobes operating, either the inlet or exhaust valves, is mounted to the outer member and a set of lobes operating the other of the inlet and exhaust valves is mounted to the inner member via pins into the inner member which pass through slots in the outer member.
  • a phase drive mechanism such as that described in U.S.
  • Patent 6,725,817 to Methley et al. can alter the relative angular positions of the inner and outer members to change the valve phasing as needed.
  • concentric camshafts provide the benefits of variable valve timing to engines with camshafts that operate both inlet and exhaust valves
  • to date systems employing concentric camshafts have only been operable with phase drives operated from pressurized lubricating oil, such as taught by the Methey reference, and have suffered from the problems, described above, at engine start time and/or at low engine operating speeds.
  • the Urushihata development appears to be an improvement over the prior art phase drives operated solely by pressurized lubrication oil, the Urushihata development cannot be employed with concentric camshaft systems.
  • a concentric camshaft and electric phase drive system comprising: an outer camshaft member having at least one cam lobe affixed to it; an inner camshaft member rotatably mounted with the outer camshaft member and having at least one cam lobe affixed to it by a member extending from the at least one cam lobe through a slot in the outer camshaft member and into the inner camshaft member; a drive sprocket to receive a synchronous drive to rotate the outer camshaft member and the inner camshaft member; and an electric phase drive independently acting between the drive sprocket and each of the inner camshaft member and the outer camshaft member and operable to advance and/or retard the angular position of the inner camshaft member relative to the angular position of the drive sprocket and to advance and/or retard the angular position of the outer camshaft member relative to the angular position of the drive sprocket
  • the present invention provides a novel concentric camshaft with electric phase drive which allows the angular position of a first set of cam lobes to be advanced or retarded with respect to the angular position of a drive sprocket and which allows the angular position of a second set of cam lobes to be advanced or retarded with respect to the angular position of the drive sprocket, the advancement or retardation of the first and second sets of cam lobes being independent of each other.
  • the electric phase drive permits the advancement and retardation of the sets of cam lobes to be performed, as desired, independently of the operating speed or condition of the engine in which the concentric camshaft is installed.
  • Figure 1 shows a schematic representation of a concentric camshaft with electric phase drive in accordance with the present invention
  • Figure 2 shows a schematic representation of another drive mechanism for use with a concentric camshaft of the present invention
  • FIG. 3 shows a schematic representation of another concentric camshaft with electric phase drive in accordance with the present invention
  • FIG. 4 shows a schematic representation of another concentric camshaft with electric phase drive in accordance with the present invention
  • FIG. 5 shows a schematic representation of another concentric camshaft with electric phase drive in accordance with the present invention.
  • Figure 6 shows a schematic representation of another concentric camshaft with electric phase drive in accordance with the present invention.
  • Figure 7 shows a schematic representation of another drive mechanism for use with a concentric camshaft of the present invention.
  • system 20 comprises a multipart camshaft 24 which includes at least one outer cam lobe 28 attached to an outer tubular member 32 of camshaft 24 and at least one inner cam lobe 36 attached by a pin 40, to an inner tubular member 44 of camshaft 24.
  • pin 40 extends through inner member 44 and through a slot 48 in outer member 32 such that the angular position of cam lobe 36 can be changed with respect to the angular position of outer member 32, as described below in more detail.
  • cam lobe 28 is intended to represent one of a set of either exhaust or inlet cams of an engine in which system 20 is installed.
  • cam lobe 36 is shown attached to inner member 44, it should be apparent to those of skill in the art that cam lobe 36 is intended to represent the other of the sets of either exhaust or inlet cams of an engine in which system 20 is installed.
  • Camshaft 24 is rotated by a drive sprocket 52 which is driven by the crankshaft of an engine by a synchronous drive (not shown) and rotates on a support bearing 54.
  • a first control shaft 56 extends from a control yoke 60 through drive sprocket 52 and into one end of outer member 32.
  • a portion of the outer surface of first control shaft 56 includes a set of splines 64 which engage a complementary set of splines on drive sprocket 52 such that first control shaft 56 rotates with drive sprocket 52 but is also free to move toward or away from camshaft 24 in response to movements of control yoke 60.
  • first control shaft 56 which extends into the end of outer member 32 includes a helical groove 68 which is complementary to another helical groove (not illustrated) formed in the interior of outer member 32 and one or more ball bearings (not shown) ride in the passage formed by the two helical grooves such that movement of first control shaft 56 towards and/or away from outer member 32 results in rotation of outer member 32 (and cam 28) about first control shaft 56.
  • a helical groove 68 which is complementary to another helical groove (not illustrated) formed in the interior of outer member 32 and one or more ball bearings (not shown) ride in the passage formed by the two helical grooves such that movement of first control shaft 56 towards and/or away from outer member 32 results in rotation of outer member 32 (and cam 28) about first control shaft 56.
  • first control shaft 56 is hollow and a second control shaft 72 extends from a second control yoke 76, through first control shaft 56, and into one end of inner member 44.
  • a portion of the outer surface of second control shaft 72 includes a set of splines (not illustrated) that engage a complementary set of splines on a portion of the interior of first control shaft 56 such that second control shaft 72 rotates with first control shaft 56 and drive sprocket 52 but is also free to move toward or away from camshaft 24 in response to movements of control second yoke 76.
  • second control shaft 72 which extends into the end of inner member 44 includes a helical groove 80 which is complementary to another helical groove (not illustrated) formed in the interior of inner member 44 and one or more ball bearings (not shown) ride in the passage formed by the two helical grooves such that movement of second control shaft 72 towards and/or away from inner member 44 results in rotation of inner member 44 (and cam 36) about second control shaft 72.
  • the angular position of cam 36 can be varied by moving second control yoke 76 and second control shaft 72 toward or away from camshaft 24, while still allowing torque from drive sprocket 52 to be transferred to cam lobe 36.
  • the illustrated embodiment employs a set complementary helical grooves with one or more ball bearings to connect first control shaft 56 to outer member 32 and second control shaft 72 to inner member 32
  • the present invention is not so limited and any suitable mechanism, as would occur to those of skill in the art, which can convert lateral movement of a control shaft into an angular displacement of a camshaft member can be employed.
  • a torsion spring 84 can be included to bias outer member 32 to a fully advanced or fully retarded position with respect to first control shaft 56.
  • a torsion spring 88 can be included to bias inner member 44 to a fully advanced or fully retarded position with respect to second control shaft 72.
  • Control yoke 60 can be positioned by any suitable actuator or control means, and in the illustrated embodiment, is positioned by a stepper motor 92 and a linear screw 96.
  • second control yoke 76 can be positioned by any suitable control means, and in the illustrated embodiment, is positioned by a stepper motor 100 and a linear screw 104.
  • Each of stepper motors 92 and 100 can be controlled by any suitable control mechanism, such as an engine control unit (ECU) which provides power 108 to motors 92 and 100, and can include position sensors 1 12 which provide appropriate feedback signals to control mechanism to indicate the position, in advance or retardation, of cams 28 and 36 relative to the angular position of drive sprocket 52.
  • ECU engine control unit
  • stepper motors 92 and 100 the inlet and exhaust cams of camshaft 24 can be set to any desired degree of angular advance or retardation, with respect to drive sprocket 52, independent of whether the engine in which system 20 is installed is running and/or independent of the operating speed of the engine.
  • FIG. 2 shows another drive mechanism for a second embodiment of the present invention wherein like components to those of Figure 1 are identified with like reference numerals.
  • control yoke 60 and second control yoke 76 and their related components have been replaced with an electro-mechanical drive mechanism 200.
  • drive mechanism 200 comprises a first armature 204 which is fixed to, and rotates with, first control shaft 56 and a second armature 208 which is fixed to, and rotates with, second control shaft 72.
  • Drive mechanism 200 further comprises a stator 212, which is stationary and fixed via one or more mounts 216 to the engine in which system 20 is installed.
  • Each of armatures 204 and 208 are biased away from stator 212 by biasing springs (not shown).
  • Stator 212 includes two, independently operable, electro magnetic coils 220 and 224 and further includes a pair of suitable sensors (not shown) which output a signal representative of the distance of armature 204 from stator 212 and a signal representative of the distance of armature 208 from stator 212.
  • armature 204 can be moved toward or away from stator 212, thus moving first control shaft 56 toward or away from outer member 32.
  • armature 208 can be moved toward (by increasing the current) or away from stator 212 (by decreasing the current), thus moving second control shaft 72 toward or away from outer member 32.
  • a suitable control mechanism such as an ECU or embedded processor unit, receives the signals relating to the distances of each of armatures 204 and 208 from stator 212 and supplies appropriate current levels and polarities to each of coils 220 and 224 to control the advance and/or retardation of the inlet and exhaust cam lobes of camshaft 24 relative to the angular position of drive sprocket 52.
  • the inlet and exhaust cams of camshaft 24 can be set to any desired degree of angular advance or retardation, with respect to drive sprocket 52, independent of whether the engine in which system 20 is installed is running and/or independent of the operating speed of the engine.
  • Figure 3 shows another embodiment of a concentric camshaft and electric phase drive system 300 of the present invention wherein like components to those of Figure 1 are identified with like reference numerals.
  • helical grooves 68 and 80 have been omitted from the Figure for clarity.
  • torsion springs 80 and 84 generate sufficient force to fully advance both outer member 32 and inner member 44, with respect to the angular position of drive sprocket 52, even when the engine in which system 300 is installed is operating.
  • a rotor 304 is fixed to first control shaft 56 and rotor 304 passes through a brake coil 308 which operates as an eddy current, or hysteresis coil.
  • a rotor 316 is fixed to second control shaft 72 and rotor 316 passes through a brake coil 320.
  • an electric current 324 is applied to brake coil 320
  • a brake force is applied to rotor 320 and this brake force acts against the bias force of torsion spring 88 to retard the angular position of inner member 44, and cam lobe 36, from the fully advanced position.
  • the electrical current applied to brake coil 320 the amount of brake force applied to rotor 316 can be controlled and the angular position of inner member 44 and cam lobe 36 selected as desired.
  • a sensor 328 will provide a signal indicative of the angular position of drive sprocket 52.
  • a sensor 332 can provide a signal representative of the angular position of rotor 304 and a sensor 336 can provide a signal representative of the angular position of rotor 316.
  • Each of these sensor output signals can be applied to a control device, such as an ECU which can control the current supplied to brake coils 308 and 320 as appropriate to obtain the desired advance or retardation of outer member 32 and inner member 44.
  • Figure 4 shows another embodiment of a concentric camshaft and electric phase drive system 400 of the present invention wherein like components to those of Figure 1 are identified with like reference numerals.
  • first control shaft 56 is fixed to outer member 32 such that outer member 32 turns with first control shaft 56.
  • second control shaft 72 is fixed to inner member 44 such that inner member 44 turns with second control shaft 72.
  • drive sprocket 52 does not inter-engage first control shaft 56 via a set of splines. Instead, a lost motion connection is utilized wherein the drive sprocket 52 includes a stop 404 which can engage either end of a slot 408 in first control shaft 56 and, within the limits created by stop 404 and the ends of slot 408, first control shaft 56 is free to rotate independently of drive sprocket 52 for a portion of one revolution.
  • first control shaft 56 includes a similar stop to stop 404 which extends radially inwardly into a slot, similar to slot 408, formed in second control shaft 72 such that, within the limits created by this stop and the ends of this slot, second control shaft 72 is free to rotate independently of first control shaft 56 and drive sprocket 52.
  • First control shaft 56 is connected to a drive motor 412 and second control shaft 72 is connected to a second drive motor 416.
  • Drive motor 412 serves to rotate first control shaft 56 and outer member 32 when the engine in which system 400 is installed is operating. By altering the rotational speed of motor 416, the angular position of outer member 32, and cam lobe 28, can be set as desired. In the event that drive motor 412 fails, stop 404 engages one end of slot 408 and outer member 32 will rotate with drive sprocket 52 with the angular position of outer member 32 being a failsafe position.
  • drive sprocket 52 acts as an input to a sensor 420 to determine the angular position of the crankshaft of the engine in which system 400 is installed.
  • a control mechanism such as an ECU, receives the signal from sensor 420, and from a sensor 424 which indicates the angular position of first control shaft 56, and a sensor 428 which indicates the angular position of second control shaft 72.
  • the control mechanism processes these input signals and applies an appropriate electrical input 432, 436 respectively to each of drive motors 412 and 416 to position cam lobes 28 and 36 with the desired angular position relative to the crankshaft.
  • FIG. 5 shows another embodiment of a concentric camshaft and electric phase drive system 500 of the present invention wherein like components to those of Figure 1 are identified with like reference numerals.
  • System 500 is similar to system 400, except that motor 504 attached to first control shaft 56 is an electric torque motor which acts between a motor mount housing 508 affixed to drive sprocket 52 and first control shaft 56.
  • motor 512 attached to second control shaft 72 acts between motor mount housing 508 and second control shaft 72.
  • a sensor 516 provides an output signal indicating the angular position of drive sprocket 52
  • a sensor 520 provides an output signal indicating the angular position of first control shaft 56
  • a sensor 524 provides an output signal indicating the angular position of second control shaft 72.
  • a suitable control mechanism such as an ECU which alters the electric current 528 and 532 applied, respectively, to motors 504 and 512, via a slip ring commutator 536.
  • FIG. 6 shows another embodiment of a concentric camshaft and electric phase drive system 600 of the present invention wherein like components to those of Figure 1 are identified with like reference numerals.
  • drive sprocket 52 drives a second drive gear 604 which in turn, drives a pair of planetary gears 608 and 612 which are linked by a shaft 616.
  • Planetary gear 612 engages a gear 620 fixed to one end of inner member 44 and thus, as drive sprocket 52 is rotated, inner member 44 is rotated with it.
  • shaft 616 is rotatably mounted through a member 624.
  • Member 624 has a radially inner portion which is rotatably mounted to a shaft 628 extending from the center of gear 604 and an outer edge which is toothed to engage a first electric drive motor 632.
  • first electric drive motor 632 is rotated in a first direction
  • member 624 is rotated in a corresponding first direction about shaft 628, moving planetary gears 608 and 612 about the circumference of second drive gear 604 and thus advancing the angular position of gear 620 with respect to the angular position of drive sprocket 52.
  • advancing the angular position of gear 620 also results in the advancement of cam lobe 36.
  • Second drive gear 604 also drives a pair of planetary gears 640 and 644 which are linked by a shaft 648.
  • Planetary gear 644 engages a gear 652 fixed to one end of outer member 32 and thus, as drive sprocket 52 is rotated, outer member 32 is rotated with it.
  • shaft 648 is rotatably mounted through a member 656.
  • Member 656 has a radially inner portion which is rotatably mounted to shaft 628 and an outer edge which is toothed to engage a second electric drive motor 660.
  • member 656 is rotated in a corresponding first direction about shaft 628, moving planetary gears 640 and 644 about the circumference of second drive gear 604 and thus advancing the angular position of gear 652 with respect to the angular position of drive sprocket 52. As is apparent, advancing the angular position of gear 652 also results in the advancement of cam lobe 28.
  • Second electric drive motor 660 is rotated in a second, opposite, direction
  • member 656 is rotated in a corresponding second direction about shaft 628, moving planetary gears 640 and 644 in the opposite direction about the circumference of second drive gear 604 and thus retarding the angular position of gear 652 with respect to the angular position of drive sprocket 52.
  • retarding the angular position of gear 652 also results in the retardation of cam lobe 28.
  • First electric drive motor 632 is equipped with a sensor 664 which outputs a signal indicating its angular position
  • second electric drive motor 660 is equipped with similar sensor 670 which outputs a signal indicating its angular position.
  • the signals from sensors 664 and 670 are provided to a suitable control mechanism, such as an ECU or the like, which processes the signals and outputs electric control signals to first electric drive motor 632 and second electric drive motor 660 to advance and/or retard cam lobe 28 and/or cam lobe 36 as desired.
  • a suitable control mechanism such as an ECU or the like, which processes the signals and outputs electric control signals to first electric drive motor 632 and second electric drive motor 660 to advance and/or retard cam lobe 28 and/or cam lobe 36 as desired.
  • FIG. 7 shows another drive mechanism 700 in accordance with the present invention wherein like components to those of Figure 1 are identified with like reference numerals.
  • inner member 44 includes an internal ring gear 704 and outer member 32 includes a similar internal ring gear 708.
  • Drive sprocket 52 includes a pair of gear shafts 712 and 716 which rotate with drive sprocket 52.
  • a pair of planetary gears 720 and 724 are mounted, respectively, on gear shafts 712 and 716 adjacent drive sprocket 52.
  • Each of planetary gears 720 and 724 engage internal ring gear 708 and a sun gear 728.
  • Sun gear 728 is connected to a phase adjustment sprocket 732 which in turn engages a first electric motor drive 736.
  • sun gear 728 is stationary (i.e. - when first electric motor drive 736 is inactive) outer member 32 will rotate synchronously with drive sprocket 52.
  • first electric motor drive 736 is activated to rotate phase adjustment sprocket 732, and thus sun gear 728 and planetary gears 720 and 724.
  • planetary gears 720 and 724 are rotated, internal ring gear 708 is rotated with respect to drive sprocket 52 and the angular position of outer member 32, relative to drive sprocket 52, is changed.
  • Operating first electric motor drive 736 in one direction will advance the angular position of outer member 32 with respect to drive sprocket 52 and operating first electric motor drive 736 in the opposite direction will retard the angular position of outer member 32 with respect to drive sprocket 52.
  • a second pair of planetary gears 740 and 744 are also mounted, respectively, on gear shafts 712 and 716 distal drive sprocket 52.
  • Each of planetary gears 740 and 744 engage internal ring gear 704 and a sun gear 748.
  • Sun gear 748 is connected to a phase adjustment sprocket 752 which in turn engages a second electric motor drive 756.
  • sun gear 748 is stationary (i.e. - when second electric motor drive 756 is inactive) inner member 44 will rotate synchronously with drive sprocket 52.
  • second electric motor drive 756 is activated to rotate phase adjustment sprocket 752, and thus sun gear 748 and planetary gears 740 and 744.
  • internal ring gear 704 is rotated with respect to drive sprocket 52 and the angular position of inner member 44, relative to drive sprocket 52, is changed.
  • Operating second electric motor drive 756 in one direction will advance the angular position of inner member 44 with respect to drive sprocket 52 and operating second electric motor drive 756 in the opposite direction will retard the angular position of inner member 44 with respect to drive sprocket 52.
  • the present invention provides a novel concentric camshaft with electric phase drive which allows the angular position of a first set of cam lobes to be advanced or retarded with respect to the angular position of a drive sprocket and which allows the angular position of a second set of cam lobes to be advanced or retarded with respect to the angular position of the drive sprocket, the advancement or retardation of the first and second sets of cam lobes being independent of each other.
  • the electric phase drive permits the advancement and retardation of the sets of cam lobes to be performed, as desired, independently of the operating speed or condition of the engine in which the concentric camshaft is installed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention porte sur un arbre à cames concentrique avec entraînement de phase électrique, qui permet à la position angulaire d'un premier ensemble de bossages de came d'être avancée ou retardée par rapport à la position angulaire d'une roue d'entraînement et permet à la position angulaire d'un second ensemble de bossages de came d'être avancée ou retardée par rapport à la position angulaire de la roue d'entraînement, l'avance ou le retard des premier et second ensembles de bossages de came étant indépendants l'un de l'autre. L'entraînement de phase électrique permet à l'avance et au retard des ensembles de bossages de came d'être effectués, si nécessaire, indépendamment de la vitesse de fonctionnement ou de l'état de fonctionnement du moteur dans lequel l'arbre à cames concentrique est installé.
PCT/CA2008/002058 2007-11-26 2008-11-26 Arbre à cames concentrique avec entraînement de phase électrique WO2009067789A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US99009007P 2007-11-26 2007-11-26
US60/990,090 2007-11-26

Publications (1)

Publication Number Publication Date
WO2009067789A1 true WO2009067789A1 (fr) 2009-06-04

Family

ID=40677976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2008/002058 WO2009067789A1 (fr) 2007-11-26 2008-11-26 Arbre à cames concentrique avec entraînement de phase électrique

Country Status (1)

Country Link
WO (1) WO2009067789A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102192235A (zh) * 2011-05-10 2011-09-21 昆山市人人发机械五金有限公司 新型冲床曲柄轴结构
WO2011147505A3 (fr) * 2010-05-27 2012-01-19 Daimler Ag Dispositif de réglage pour moteur à combustion interne
CN102853047A (zh) * 2012-09-25 2013-01-02 黄幼华 一种往复运动机械行程自定位装置
US20130055977A1 (en) * 2011-09-03 2013-03-07 Honda Motor Co., Ltd. Internal combustion engine with variable valve opening characteristics
DE102012206500A1 (de) * 2012-04-19 2013-10-24 Mahle International Gmbh Brennkraftmaschine
WO2013128295A3 (fr) * 2012-02-28 2013-11-21 Schaeffler Technologies AG & Co. KG Mise en phase électrique d'un arbre à cames concentrique
JP2014509711A (ja) * 2011-03-30 2014-04-21 ボーグワーナー インコーポレーテッド 同心カムシャフト位相器ねじり駆動機構
FR3000166A1 (fr) * 2012-12-20 2014-06-27 Peugeot Citroen Automobiles Sa Moteur a combustion de vehicule automobile a distribution de faible encombrement
RU2689061C1 (ru) * 2018-06-14 2019-05-23 Федеральное государственное бюджетное образовательное учреждение высшего образования "Южно-Уральский государственный аграрный университет" (ФГБОУ ВО Южно-Уральский ГАУ) Устройство для бесступенчатого принудительного изменения углового положения кулачкового вала при стендовых испытаниях двигателя
DE102017128733A1 (de) 2017-12-04 2019-06-06 Schaeffler Technologies AG & Co. KG Nockenwellenversteller
FR3088674A1 (fr) * 2018-11-15 2020-05-22 Renault S.A.S Dispositif de commande directe de levee variable de soupape d'un moteur a combustion interne
US11162395B2 (en) 2017-12-01 2021-11-02 Schaeffler Technologies AG & Co. KG Camshaft phasers for concentrically arranged camshafts
US11261806B1 (en) 2021-02-17 2022-03-01 Ford Global Technologies, Llc Camshaft assembly for controlling air flow
EP3936739A4 (fr) * 2019-03-05 2023-02-08 NTN Corporation Actionneur électrique

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5326321A (en) * 1992-06-25 1994-07-05 Chang Ping Lung Adjusting device for adjusting the instantaneous relative angular difference between two rotating members
US5803030A (en) * 1997-01-10 1998-09-08 Cole; Kenneth Wade Phase adjustable cam drive
US6167854B1 (en) * 1999-04-01 2001-01-02 Daimlerchrysler Corporation Two-part variable valve timing mechanism
US6725817B2 (en) * 2000-11-18 2004-04-27 Mechadyne Plc Variable phase drive mechanism
WO2005095765A1 (fr) * 2004-03-26 2005-10-13 Schaeffler Kg Dispositif de reglage electrique d'arbres a cames avec moteur a entrefer plat
WO2006005406A1 (fr) * 2004-07-10 2006-01-19 Schaeffler Kg Regulateur d'arbre a cames a commande electrique
US20060060159A1 (en) * 2004-09-17 2006-03-23 Moretz R D Dynamic valve timing adjustment mechanism for internal combustion engines
US20070119402A1 (en) * 2005-11-28 2007-05-31 Lancefield Timothy M Variable phase drive coupling
US20070137598A1 (en) * 2005-12-21 2007-06-21 Oliver Fritz Camshaft
US7287499B2 (en) * 2005-02-23 2007-10-30 Mechadyne Plc Camshaft assembly

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5326321A (en) * 1992-06-25 1994-07-05 Chang Ping Lung Adjusting device for adjusting the instantaneous relative angular difference between two rotating members
US5803030A (en) * 1997-01-10 1998-09-08 Cole; Kenneth Wade Phase adjustable cam drive
US6167854B1 (en) * 1999-04-01 2001-01-02 Daimlerchrysler Corporation Two-part variable valve timing mechanism
US6725817B2 (en) * 2000-11-18 2004-04-27 Mechadyne Plc Variable phase drive mechanism
WO2005095765A1 (fr) * 2004-03-26 2005-10-13 Schaeffler Kg Dispositif de reglage electrique d'arbres a cames avec moteur a entrefer plat
WO2006005406A1 (fr) * 2004-07-10 2006-01-19 Schaeffler Kg Regulateur d'arbre a cames a commande electrique
US20060060159A1 (en) * 2004-09-17 2006-03-23 Moretz R D Dynamic valve timing adjustment mechanism for internal combustion engines
US7287499B2 (en) * 2005-02-23 2007-10-30 Mechadyne Plc Camshaft assembly
US20070119402A1 (en) * 2005-11-28 2007-05-31 Lancefield Timothy M Variable phase drive coupling
US20070137598A1 (en) * 2005-12-21 2007-06-21 Oliver Fritz Camshaft

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011147505A3 (fr) * 2010-05-27 2012-01-19 Daimler Ag Dispositif de réglage pour moteur à combustion interne
JP2014509711A (ja) * 2011-03-30 2014-04-21 ボーグワーナー インコーポレーテッド 同心カムシャフト位相器ねじり駆動機構
CN102192235A (zh) * 2011-05-10 2011-09-21 昆山市人人发机械五金有限公司 新型冲床曲柄轴结构
US20130055977A1 (en) * 2011-09-03 2013-03-07 Honda Motor Co., Ltd. Internal combustion engine with variable valve opening characteristics
US9188030B2 (en) * 2011-09-03 2015-11-17 Honda Motor Co., Ltd. Internal combustion engine with variable valve opening characteristics
US9249695B2 (en) 2012-02-28 2016-02-02 Schaeffler Technologies AG & Co. KG Electric phasing of a concentric camshaft
WO2013128295A3 (fr) * 2012-02-28 2013-11-21 Schaeffler Technologies AG & Co. KG Mise en phase électrique d'un arbre à cames concentrique
US8820283B2 (en) 2012-04-19 2014-09-02 Mahle International Gmbh Internal combustion engine
DE102012206500A1 (de) * 2012-04-19 2013-10-24 Mahle International Gmbh Brennkraftmaschine
CN102853047A (zh) * 2012-09-25 2013-01-02 黄幼华 一种往复运动机械行程自定位装置
FR3000166A1 (fr) * 2012-12-20 2014-06-27 Peugeot Citroen Automobiles Sa Moteur a combustion de vehicule automobile a distribution de faible encombrement
US11162395B2 (en) 2017-12-01 2021-11-02 Schaeffler Technologies AG & Co. KG Camshaft phasers for concentrically arranged camshafts
DE102017128733A1 (de) 2017-12-04 2019-06-06 Schaeffler Technologies AG & Co. KG Nockenwellenversteller
DE102017128733B4 (de) 2017-12-04 2020-04-23 Schaeffler Technologies AG & Co. KG Nockenwellenversteller
RU2689061C1 (ru) * 2018-06-14 2019-05-23 Федеральное государственное бюджетное образовательное учреждение высшего образования "Южно-Уральский государственный аграрный университет" (ФГБОУ ВО Южно-Уральский ГАУ) Устройство для бесступенчатого принудительного изменения углового положения кулачкового вала при стендовых испытаниях двигателя
FR3088674A1 (fr) * 2018-11-15 2020-05-22 Renault S.A.S Dispositif de commande directe de levee variable de soupape d'un moteur a combustion interne
EP3936739A4 (fr) * 2019-03-05 2023-02-08 NTN Corporation Actionneur électrique
US11965437B2 (en) 2019-03-05 2024-04-23 Ntn Corporation Electric actuator
US11261806B1 (en) 2021-02-17 2022-03-01 Ford Global Technologies, Llc Camshaft assembly for controlling air flow

Similar Documents

Publication Publication Date Title
WO2009067789A1 (fr) Arbre à cames concentrique avec entraînement de phase électrique
US7421990B2 (en) Harmonic drive camshaft phaser
JP4459826B2 (ja) バルブタイミング調整装置
EP0918142B1 (fr) Dispositif pour le contrôle de la phase angulaire
CN100346062C (zh) 可变凸轮轴正时装置的液压定位的相位器和其制造方法
US7562645B2 (en) Electromechanical camshaft phaser having a worm gear drive with a hypoid gear actuator
EP1914396A2 (fr) Déphaseur d'arbre à cames doté d'un système de différentiel
EP1571301B1 (fr) Dispositif déphaseur d'arbres à cames pour moteur à combustion interne
JP5391461B2 (ja) カムシャフトユニット
US6622677B2 (en) Worm gear driven variable cam phaser
JP2004092653A5 (fr)
JP2004092653A (ja) 位相器のノイズ低減方法
JP2004232628A (ja) 可変カムタイミング（ｖｃｔ）システム
US7421991B2 (en) Brake-actuated vane-type camshaft phaser
EP1416126B1 (fr) Système variateur de phase d'arbre à cames avec mécanisme de verrouillage électromagnétique pour actionnement de déphasage et de verrouillage
US6745732B2 (en) VCT cam timing system utilizing calculation of intake phase for dual dependent cams
JP4590392B2 (ja) 内燃機関のバルブタイミング制御装置
KR20110104009A (ko) 소형 전기 캠 페이저
US20120199085A1 (en) Camshaft arrangement
JP5192454B2 (ja) バルブタイミング調整装置
EP2180151B1 (fr) Ensemble de soupape d'échappement pour moteur à combustion interne
JP2000045722A (ja) バルブタイミング調整装置
JP4109972B2 (ja) 内燃機関のバルブタイミング制御装置
JP2003301703A (ja) 内燃機関のバルブタイミング制御装置
JP2009068457A (ja) バルブタイミング調整装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08854507

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08854507

Country of ref document: EP

Kind code of ref document: A1