US20190301313A1 - Electric camshaft phase-shifter with single shaft - Google Patents

Electric camshaft phase-shifter with single shaft Download PDF

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Publication number
US20190301313A1
US20190301313A1 US16/302,945 US201716302945A US2019301313A1 US 20190301313 A1 US20190301313 A1 US 20190301313A1 US 201716302945 A US201716302945 A US 201716302945A US 2019301313 A1 US2019301313 A1 US 2019301313A1
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US
United States
Prior art keywords
shifting
rotation
angle
continuous phase
regulating device
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.)
Abandoned
Application number
US16/302,945
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English (en)
Inventor
Laurent Herbein
Gaël Andrieux
Pierre-Alexis GRIVIAU
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.)
Sonceboz Automotive SA
Original Assignee
Sonceboz Automotive SA
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 Sonceboz Automotive SA filed Critical Sonceboz Automotive SA
Assigned to SONCEBOZ AUTOMOTIVE SA reassignment SONCEBOZ AUTOMOTIVE SA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HERBEIN, Laurent, ANDRIEUX, Gaël, GRIVIAU, Pierre-Alexis
Publication of US20190301313A1 publication Critical patent/US20190301313A1/en
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
    • F01L1/352—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
    • F01L1/34—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
    • F01L2001/3521—Harmonic drive of flexspline type

Definitions

  • the present invention relates to the field of setting valve lift laws specific to the internal combustion engine. It more particularly relates to a camshaft incorporating a phase-shifting device, intended for a variable distribution engine.
  • the setting of the intake and exhaust valve lift laws is generally a compromise between different goals. For example, a search for maximum performance will involve a compromise between a low-end torque and a maximum power at high speed. On the other hand, a compromise between idle stability, the emission of pollutants at low load and a maximum power at high speed, can be considered.
  • the principle of a proper setting depending on speed or the load appears therefore interesting. Furthermore, various systems making it possible to achieve such goal mostly only apply to motors with two, respectively one intake and one exhaust, camshafts.
  • the invention more particularly relates to the field of electrical devices for adjusting the rotation angle of a camshaft.
  • the European patent application EP2194241 which describes a cam variable setting device for a camshaft of an internal combustion engine is known in the state of the art.
  • This device consists of a drive element and a harmonic drive reduction gearbox in operative connection with the drive element, and an output element for driving a camshaft.
  • the reduction gearbox is adjustable by means of a rotary drive shaft.
  • this document always refers to an electric machine, the rotor of which is outside the stator. The latter must also be guided, via a bearing, on the output shaft of the reduction gearbox which is screwed onto the camshaft. Assembling the engine is thus relatively complex with a bearing being required between the stator and the output shaft.
  • using a rotor outside the stator imposes an important mobile inertia such which may be difficult to dynamically drive in the application.
  • the international patent application WO/2010/068613 discloses an electric phase-shifting device intended for a camshaft of an internal combustion engine comprising an axial flow electric machine which is incorporated in a differential gear train and which may allow a frictional locking.
  • the electric machine has no direct coupling link with the shaft, and two bearings are thus required for positioning the stator, on the one hand, and the rotor, on the other hand. The ease of assembly of the engine is thus affected.
  • the prior art solutions are not satisfactory in that construction and assembly are not facilitated and require a large number of guidings.
  • the solutions of the prior art are not completely satisfactory especially as regards the angular accuracy.
  • the harmonic drive gearboxes do not have a high stiffness in torsion. Given the high torque applied by such devices (about 50 Newtons per meter), this results in a risk of unintentional angular shift.
  • the object of the invention consists in providing an improvement to the camshaft phase-shifting solutions by using a compact motor reducer, the mounting of which is facilitated and the number of parts in which is minimized.
  • the present invention in its broadest sense, relates to a regulating device for the continuous phase-shifting of the angle of rotation of a camshaft controlling the gas exchange valves of an internal combustion engine with respect to a drive element, in particular a chain or a belt, comprising a brushless electric regulating motor with a stator which is stationary with respect to an external ring gear, with the engine being coupled to a reduction gearbox with three inputs/outputs comprising the external ring gear, an input element and an output disc, with the outer ring gear being driven by said drive element, with said output drive being secured to the camshaft.
  • the device includes a single shaft inside the stator of the electric motor, with said electric motor comprising a rotor secured to the single shaft so that said single shaft supports the rotor
  • said reduction gearbox is a reduction gearbox of the trochoidal type
  • the axial single shaft supports the eccentric(s) enabling a reduction gearbox of the trochoidal type.
  • the inner surface of said external ring gear advantageously has a tubular toothed path meshed with one or more toothed wheel(s) mounted on said eccentrics having bores having a circular cross-section distributed over the annular area of said toothed wheel, with the trochoidal reduction gearbox comprising a set of pins having a section smaller than that of said bores, with said pins being secured to said output disc and passing through said bores to ensure the transmission of the motion between said eccentrically moving toothed wheel and said output disc.
  • said reduction gearbox is a reduction gearbox of the epicyclic type
  • the axial single shaft carries the inner sun gear.
  • the inner surface of said external ring gear advantageously has a tubular toothed path meshed with one or more satellite(s), with the satellites being rotatable about pins secured to said output disc to ensure the transmission of the motion between the satellite(s) and said output disc.
  • said single shaft has a through bore.
  • said output disc is advantageously secured to the camshaft by a screw having a thread matching the internal thread of the camshaft and bearing against a radial shoulder of said output disc.
  • said electric motor is enclosed in an outer casing having a housing receiving a guide element of said single shaft.
  • the stator of said electric motor is overmolded and secured to said outer casing.
  • said electric motor advantageously comprises a printed circuit supporting the electronic components for steering and powering the electric coils carried by the stator. Still to enable the control of the device, the latter preferably comprises at least one position sensor delivering a signal according to the angular position of said output disc.
  • the device also preferably comprises at least one position sensor delivering a signal according to the angular position of said external ring gear. If pins are used, these may advantageously be engaged, at their free ends, by a pin-holder, provided with a permanent magnet positioned opposite a magneto-sensitive probe forming said position sensor with said magnet.
  • said electric motor may have an outer casing having an outer surface matching a housing provided on the cylinder head of the internal combustion engine. In this case, said outer casing can also have fastening elements for attachment on the cylinder head of the combustion engine.
  • FIGS. 1 a and 1 b show a longitudinal cross-sectional view of a device according to the invention according to a first embodiment and respectively using a reduction gearbox of the trochoidal type and a reduction gearbox of the epicyclic type;
  • FIG. 2 shows an isolated view of an exemplary toothed wheel belonging to the reduction gearbox of the trochoidal type which may be used for the invention
  • FIG. 3 shows an isolated view of an exemplary output assembly of a reduction gearbox of the trochoidal type which may be used for the invention
  • FIG. 4 shows an exploded view of an exemplary embodiment of a reduction gearbox of the trochoidal type which may be used for the invention
  • FIG. 5 shows an exploded view of an exemplary embodiment of the sub-assemblies of the invention
  • FIG. 6 shows a longitudinal cross-sectional view of a device according to the invention, according to a second embodiment
  • FIG. 7 shows an exploded view of the second exemplary embodiment of the sub-assemblies of the invention.
  • FIG. 8 shows an isolated view of one embodiment of an output assembly highlighting the interest of the pin-holder used for measuring the phase-shifting
  • FIG. 9 shows a view of a regulating device according to the invention mounted on the cylinder head of a combustion engine
  • FIG. 10 shows a longitudinal cross-sectional view of a device according to the invention, according to a third embodiment.
  • FIG. 11 shows a longitudinal cross-sectional view of a device according to the invention, according to a fourth embodiment.
  • FIG. 1 a shows a cross-sectional view of a device according to an exemplary embodiment of the invention, coupled to a camshaft 1 .
  • the device consists of an electric motor 2 associated with a reduction gearbox 3 , here of the trochoidal type.
  • the reduction gearbox 3 comprises an external ring gear 4 driven by the timing chain or belt of the internal combustion engine (not shown).
  • This external ring gear 4 has a typical outside diameter of 100 to 150 millimeters and has outer teeth adapted to driving by said timing chain.
  • the inner surface thereof has a toothed path 5 , with a tubular shape.
  • This external ring gear 4 is free to rotate relative to the camshaft 1 .
  • An eccentric toothed wheel 6 has a section lower than the inner section of the external ring gear 4 , with the number of teeth of the toothed wheel 6 being less than the number of teeth of the toothed path 5 on the inner surface of the external ring gear 4 , for an identical module.
  • the difference between the number of teeth of the toothed wheel 6 and the number of teeth of the toothed path 5 on the inner surface of the external ring gear 4 is advantageously one tooth in order to maximize the reduction ratio of the trochoidal reduction gearbox 3 .
  • This toothed wheel 6 is guided by a bearing 7 mounted on the single shaft 8 at an eccentric 9 the axis of revolution of which is shifted with respect to the median axis of the single shaft 8 .
  • the shifting between the two axes generally ranges from 0.1 to 1 mm and depends on the gearing module of the trochoidal meshing.
  • the eccentric toothed wheel 6 has a series of circular bores 10 angularly distributed on an annular track, as can be seen in FIG. 2 .
  • these bores 10 are traversed by pins 11 having a circular cross-section S g which is smaller than the section S p of the circular bores 10 .
  • the circular section S g has a diameter reduced by twice the eccentricity between the single shaft 8 and the eccentric relative to the diameter of the section S p .
  • the pins 11 are erected perpendicularly to the transverse surface of an output disc 12 .
  • the output disc 12 is coaxial with the single shaft 8 and is free to rotate with respect to this single shaft 8 . It is guided, with respect to this single shaft 8 , by a bearing 13 .
  • the ends of the pins 11 are taken by a pin holder 20 which advantageously makes it possible to increase the stiffness in torsion of the outlet assembly 21 of the reduction gearbox 3 , formed by the pin holder 20 , the pins 11 and the output disc 12 .
  • Said pin holder 20 may, in a particular embodiment, advantageously be guided on a cylindrical inner surface 27 of the external ring gear which thus improves the guiding of the output assembly 21 of the reduction gearbox 3 .
  • the output disc 12 has a shoulder 14 for guiding the external ring gear 4 .
  • the output disc 12 is secured to the camshaft 1 by a screw 23 with which it is coupled by means of a radial enlargement 15 , closest to the axis of rotation of the assembly formed.
  • the invention is not limited to the reduction gearbox of the trochoidal type.
  • other reduction gearboxes can be used, for example a reduction gearbox of the epicyclic type.
  • FIG. 1 b shows, like FIG. 1 a a cross-section using such a reduction gearbox. Selecting one reduction gearbox or another may be dictated by the desired reduction ratio and by the final cost of the solution.
  • the single shaft 8 carries a sun gear 34 which meshes with typically two or three satellites 35 , which in turn also mesh with the toothed path 5 of the external ring gear 4 .
  • the satellites 35 are rotatable about pins 11 secured to the output disc 12 , with the latter forming the planet carrier. The controlled relative motion between the sun gear 34 and the external ring gear 4 makes it possible to thereby regulate the phase-shifting.
  • the engine 2 comprises a rotor 16 secured to the single shaft 8 . It is provided with permanent magnets 17 which are alternately magnetized, typically radially or in a scalloped way.
  • the single shaft 8 carries the input element of the reduction gearbox: for instance, the eccentric toothed wheel 6 in the case of the trochoidal gearbox, or the internal sun gear 34 in the case of the epicyclic gearbox.
  • the stator 18 of the electric motor 2 consists of a set of electric coils 24 forming a polyphase assembly, and a generally laminated ferromagnetic part.
  • the engine 2 further comprises an electronic control circuit 19 for controlling the operation of the engine, with a rotation synchronized with the distribution chain, except during the phase-shifting control.
  • the assembly formed by the stator 18 , the rotor 16 and the electronic circuit 19 is positioned in an outer casing 29 which can be a housing or an overmolding skin.
  • the single shaft 8 can thus be guided relative to the outer casing 29 using a bearing 30 between the reduction gearbox and the rotor 16 .
  • a seal 22 is positioned on the single shaft 8 in contact with the outer casing 29 of the engine.
  • the mounting of the motor reducer formed is thus greatly simplified in this embodiment.
  • the rotor 16 and the output disc 21 , and all the reduction gearbox elements 3 can be mounted on the single shaft 8 and then the electric motor 2 can be mounted on said single shaft 8 , after positioning the seal 22 to enable the mounting of the assembly on the camshaft 1 via the radial enlargement 15 which has a smaller diameter than the hollow inner diameter of the single shaft 8 .
  • the single shaft 8 can then be attached coaxially with the camshaft 1 by screwing this radial enlargement 15 on the camshaft 1 .
  • FIG. 5 shows the described sub-assemblies and the assembling sequence thereof.
  • the single input shaft 8 of the reduction gearbox which carries the magnet of the electric motor 2 , is fully guided and carried by the reduction gearbox 3 .
  • This embodiment makes it possible to position, at first, the reduction gearbox 3 with the single shaft 8 carrying the rotor 16 directly on the camshaft 1 , then secondly to directly insert the stator 18 of the electric motor 2 on said input shaft 8 .
  • assembling is facilitated and can be significantly simplified.
  • the mechanical clearance between the magnet 17 of the electric motor 2 and the stator 18 should advantageously be increased in order to tolerate the probable misalignments between the single input shaft 8 of the reduction gearbox 3 and the axis of the cylindrical housing of the magnet of the electric motor 2 in the stator 18 .
  • using a brushless motor, i.e. without any mechanical contact between the stator and the rotor, is particularly advantageous in this respect.
  • the single shaft 8 can be used as a ferromagnetic yoke for the magnets 17 as shown in FIG. 6 .
  • FIG. 7 makes it possible to see the easy mounting by first placing the reduction gearbox 3 with the single shaft 8 on the camshaft 1 and then the stator 18 of the electric motor 2 which is further screwed on the engine cylinder head 26 , at a housing 25 , using fastening elements 33 , here in the form of eyelets, so as to form an assembly as shown in FIG. 9 .
  • fastening elements 33 here in the form of eyelets
  • the pin holder 20 sliding on the cylindrical inner surface 27 of the external ring gear 4 is connected to the output disc 12 to form the outlet assembly 21 .
  • Positioning a sensor magnet secured to this output assembly, for instance in the form of a disc or a magnet ring 31 can also be considered.
  • Positioning a probe for measuring the magnetic field beside the stator 18 , opposite the magnet ring or disc 31 thus makes it possible to build a phase-shifting absolute position sensor, i.e. makes it possible to know the position of the camshaft 1 .
  • phase-shifting i.e. makes it possible to know the position of the camshaft 1 .
  • variable reluctance motor can also be considered instead of the motor with a magnetized rotor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US16/302,945 2016-05-27 2017-05-24 Electric camshaft phase-shifter with single shaft Abandoned US20190301313A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1654778 2016-05-27
FR1654778A FR3051835B1 (fr) 2016-05-27 2016-05-27 Dephaseur d'arbre a cames electrique a arbre unique
PCT/EP2017/062636 WO2017202971A1 (fr) 2016-05-27 2017-05-24 Dephaseur d'arbre a cames electrique a arbre unique

Publications (1)

Publication Number Publication Date
US20190301313A1 true US20190301313A1 (en) 2019-10-03

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US16/302,945 Abandoned US20190301313A1 (en) 2016-05-27 2017-05-24 Electric camshaft phase-shifter with single shaft

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US (1) US20190301313A1 (fr)
EP (1) EP3464841A1 (fr)
JP (1) JP2019517635A (fr)
FR (1) FR3051835B1 (fr)
WO (1) WO2017202971A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3109034A1 (fr) * 2020-04-03 2021-10-08 Sonceboz Mechatronics Boncourt Sa Actionneur électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111022731B (zh) * 2019-11-14 2024-06-14 慈溪凯业电器有限公司 一种智能型民用燃气表执行器
FR3105641B1 (fr) 2019-12-19 2021-12-17 Moving Magnet Tech Machine électrique double triphasée et procédé de commande d’une telle machine

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6681799B2 (en) * 2001-09-21 2004-01-27 Siemens Vdo Automotive, Inc. Exhaust gas regulator including an overmolded housing
US20050199201A1 (en) * 2002-10-17 2005-09-15 Ina-Schaeffler Kg Electrically driven camshaft adjuster
US20090121671A1 (en) * 2007-11-13 2009-05-14 Denso Corporation Valve timing control apparatus
US20110000737A1 (en) * 2008-02-12 2011-01-06 Jtekt Corporation Vehicle steering apparatus
US20110048350A1 (en) * 2006-08-25 2011-03-03 Borgwarner Inc. Variable force solenoid with integrated position sensor
US20110253085A1 (en) * 2010-04-20 2011-10-20 Hitachi Automotive Systems, Ltd. Valve-timing control apparatus for internal combustion engine
US20130068185A1 (en) * 2011-09-20 2013-03-21 Hitachi Automotive Systems, Ltd. Control device and method for controlling variable valve timing mechanism in internal combustion engine
US20130206087A1 (en) * 2012-02-15 2013-08-15 Hitachi Automotive Systems, Ltd. Valve timing control apparatus for internal combustion engine
US8544432B2 (en) * 2010-04-28 2013-10-01 Hitachi Automotive Systems, Ltd. Variable valve actuation apparatus of internal combustion engine
US8682564B2 (en) * 2010-08-30 2014-03-25 Delphi Technologies, Inc. Camshaft position sensing in engines with electric variable cam phasers
US20150315939A1 (en) * 2012-12-10 2015-11-05 Borgwarner Inc. Split ring gear planetary cam phaser

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918142B1 (fr) * 1997-11-21 2003-10-15 Mazda Motor Corporation Dispositif pour le contrôle de la phase angulaire
DE102004041769B4 (de) * 2004-08-28 2018-12-20 Schaeffler Technologies AG & Co. KG Nockenwellenversteller

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6681799B2 (en) * 2001-09-21 2004-01-27 Siemens Vdo Automotive, Inc. Exhaust gas regulator including an overmolded housing
US20050199201A1 (en) * 2002-10-17 2005-09-15 Ina-Schaeffler Kg Electrically driven camshaft adjuster
US20110048350A1 (en) * 2006-08-25 2011-03-03 Borgwarner Inc. Variable force solenoid with integrated position sensor
US20090121671A1 (en) * 2007-11-13 2009-05-14 Denso Corporation Valve timing control apparatus
US20110000737A1 (en) * 2008-02-12 2011-01-06 Jtekt Corporation Vehicle steering apparatus
US20110253085A1 (en) * 2010-04-20 2011-10-20 Hitachi Automotive Systems, Ltd. Valve-timing control apparatus for internal combustion engine
US8544432B2 (en) * 2010-04-28 2013-10-01 Hitachi Automotive Systems, Ltd. Variable valve actuation apparatus of internal combustion engine
US8682564B2 (en) * 2010-08-30 2014-03-25 Delphi Technologies, Inc. Camshaft position sensing in engines with electric variable cam phasers
US20130068185A1 (en) * 2011-09-20 2013-03-21 Hitachi Automotive Systems, Ltd. Control device and method for controlling variable valve timing mechanism in internal combustion engine
US20130206087A1 (en) * 2012-02-15 2013-08-15 Hitachi Automotive Systems, Ltd. Valve timing control apparatus for internal combustion engine
US20150315939A1 (en) * 2012-12-10 2015-11-05 Borgwarner Inc. Split ring gear planetary cam phaser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3109034A1 (fr) * 2020-04-03 2021-10-08 Sonceboz Mechatronics Boncourt Sa Actionneur électrique

Also Published As

Publication number Publication date
FR3051835B1 (fr) 2018-05-11
WO2017202971A1 (fr) 2017-11-30
EP3464841A1 (fr) 2019-04-10
JP2019517635A (ja) 2019-06-24
FR3051835A1 (fr) 2017-12-01

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