US20030145816A1 - Device for controlling the relative rotary position between a crankshaft and a camshaft - Google Patents

Device for controlling the relative rotary position between a crankshaft and a camshaft Download PDF

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Publication number
US20030145816A1
US20030145816A1 US10/360,440 US36044003A US2003145816A1 US 20030145816 A1 US20030145816 A1 US 20030145816A1 US 36044003 A US36044003 A US 36044003A US 2003145816 A1 US2003145816 A1 US 2003145816A1
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US
United States
Prior art keywords
gear
camshaft
servomotor
planet carrier
gear mechanism
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
US10/360,440
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English (en)
Inventor
Kai Lehmann
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.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Assigned to DAIMLERCHRYSLER AG reassignment DAIMLERCHRYSLER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEHMANN, KAI
Publication of US20030145816A1 publication Critical patent/US20030145816A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—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
    • 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
    • F01L1/024—Belt drive

Definitions

  • the invention relates to a device for controlling the adjustment of the relative rotary position between a crankshaft and a camshaft of an internal combustion engine.
  • control times are varied as a function of operating parameters, in particular, the engine speed by, for example, changing the rotary position of the camshaft with respect to the crankshaft during engine operation.
  • This is controlled or regulated as a function of operating characteristic variables, characteristic curves and/or characteristic diagrams.
  • control or regulation will also be assumed mean “control” without referring to it each time.
  • DE 36 07 256 A1 discloses a device for the controlled adjustment of the relative rotary position of a driven machine part with respect to a driving machine part, or in particular the relative rotary position of a camshaft with respect to a crankshaft of an internal combustion engine.
  • the camshaft is driven by the crankshaft by means of a toothed belt and an externally toothed drive wheel.
  • a servomotor is connected in each case directly, in a rotationally fixed fashion, to the camshaft via its drive shaft and on the other hand to the drive wheel via its casing so that a rotationally contollable connection of the camshaft and drive wheel is achieved by means of a holding torque which is provided by the servomotor.
  • the servomotor acts like a clutch and changes only the rotary position without affecting the transmission ratio between the crankshaft to the camshaft.
  • the casing of the servomotor rotates with the drive wheel, the electrical power and the control signals however have to be transmitted by means of slip contacts.
  • the mass of the servomotor increases the rotating masses of the camshaft and its drive, and thus the forces of inertia.
  • EP 0 254 058 A2 discloses an adjustment device for a camshaft for controlling the gas intake and exhaust valves of internal combustion engines.
  • the camshaft is composed of a hollow external shaft and a hollow internal shaft mounted therein by means of bearings. While the control cams for some of the valves, the inlet valves or the outlet valves, are shrink-fitted onto the hollow external shaft, the cams for the other valves are rotatably mounted on the external shaft and connected for rotation with the hollow internal shaft.
  • the adjustment device can change the relative rotary position of the internal shaft with respect to the external shaft and thus the rotary position of the exhaust valves with respect to the inlet valves over a limited rotary angle range. At the same time, the rotary positions of the external shaft and of the internal shaft change with respect to a drive wheel, which is driven by the crankshaft.
  • the device comprises a planetary gear mechanism in which the drive wheel serves as a planet gear carrier on which the planet gears are rotatably supported by means of planet gear bolts.
  • the planet gears intermesh on the one hand with an annular gear, which is connected for rotation with the casing of a servomotor by means of a side plate, and on the other hand to a sun gear, which is mounted for rotation with the internal shaft.
  • the motor shaft of the servomotor is also connected for rotation with the internal shaft, and thus to the sun gear.
  • the servomotor is electrically controlled in such a way that actuating pulses which are opposed in terms of the direction of rotation are alternately applied to the servomotor.
  • actuating pulses which are opposed in terms of the direction of rotation are alternately applied to the servomotor.
  • a virtually rigid connection is formed between the external shaft and the internal shaft so that the planetary gear mechanism rotates locked with the servomotor and the drive wheel.
  • the servomotor In order to change the angular position, the servomotor must merely be controlled in such a way that its motor shaft is rotated.
  • a fixed transmission ratio of the planetary gear mechanism which does not influence the transmission ratio of the camshaft drive, determines to what degree the cams are rotated with respect to one another and in relation to the drive wheel.
  • the servomotor may be controlled as a function of characteristic variables, which are dependent on specific operating states of the internal combustion engine. As a result, the angular position of the cams with respect to one another can be set or controlled in accordance with the engine operating conditions.
  • the servomotor increases the mass of the inertia of the camshaft.
  • a drive wheel is connected to the camshaft by way of an angular position control mechanism including a planetary gear arrangement with an annular gear connected to, or part of, the drive wheel, a sun gear mounted on the camshaft and at least one planetary gear disposed between, and in engagement with, the annular gear and the sun gear and rotatably supported on a planetary gear carrier which is rotatable over a certain angular range by a stationary servomotor for controlling the angular positions of the camshaft relative to the crankshaft.
  • an angular position control mechanism including a planetary gear arrangement with an annular gear connected to, or part of, the drive wheel, a sun gear mounted on the camshaft and at least one planetary gear disposed between, and in engagement with, the annular gear and the sun gear and rotatably supported on a planetary gear carrier which is rotatable over a certain angular range by a stationary servomotor for controlling the angular positions of the camshaft relative to the crankshaft.
  • the step-down ratio i 2 which is expediently greater than 1 is obtained between the hollow wheel and the sun gear and it provides, as a product together with the step-down ratio i 1 between the crankshaft and the drive wheel, the overall step-down ratio i ges .
  • a step-down ratio i 2 of less than two may be selected and the dimensions of the step-down gearing between the crankshaft and the drive wheel may be made smaller.
  • the casing of the servomotor is connected fixed in terms of rotation to the casing of the internal combustion engine so that a simple connection with the power supply and with the control unit is obtained and the mass of inertia of the arrangement is increased only insignificantly.
  • the control unit can advantageously be directly mounted on the servomotor or integrated into it, resulting in a compact design and short control drive path.
  • the installation space can also be reduced by forming the drive wheel and the annular gear of the planetary gear mechanism in one piece.
  • the gear mechanism wheel for controlling the relative rotary position of the camshaft with respect to the crankshaft can be integrally formed with the planet carrier.
  • the relative rotary position between the crankshaft and the camshaft is changed by the electric servomotor in that it rotates the gear mechanism wheel through a desired angular distance by means of its motor shaft and an output element, said distance being predefined by the control device as a function of engine operating parameters.
  • All the transmission means which are known from gear mechanism technology and are suitable, can be used as drive elements.
  • a simple and expedient solution has proven to be a worm on the motor shaft of the servomotor, which intermeshes with the externally toothed gear mechanism wheel on the planet carrier.
  • beveled gears or other gear mechanism elements which result in actuating torques being transmitted with as little play as possible and a low level of noise, can also be used. It for example is possible to use obliquely toothed gear mechanism wheels, which can also be engaged together free of play with respect to one another.
  • the reaction torques of the planet carrier are supported on the casing by means of the servomotor. So that the position of the planet carrier is held even without a servomotor being energized, the servomotor can be equipped with a motor brake.
  • the servomotor adjusts the planet carrier by means of a self-locking gear mechanism, for example in that the gear mechanism wheel is formed as a gear which intermeshes with a worm on the motor shaft of the servomotor. As a result of the self-locking, the frictional forces are sufficient to hold the gear mechanism wheel, and thus the planet carrier, in position.
  • the actuating torques of the servomotor can be reduced in that the servomotor drives the gear mechanism wheel by means of a plurality of gear mechanism stages.
  • the actuating torque is supported by the drive torque of the camshaft so that the spring element can be pre-stressed without an appreciable degree of expenditure.
  • the servomotor is supported by the pre-stressed spring element so that an approximately similar actuating torque is obtained in both actuating directions.
  • FIG. 1 is a schematic view of a device according to the invention
  • FIG. 2 is a schematic partial longitudinal sectional view of an actuating device
  • the device according to the invention is accommodated in a casing 1 for example in a control casing, of the internal combustion engine, which is not illustrated in more detail.
  • the device comprises a drive gear 3 , which is driven by a crankshaft by means of a toothed belt or chain (not illustrated).
  • the drive gear 3 is coupled, fixed in terms of rotation, to an annular gear 4 . It can also be formed integrally with the annular gear 4 .
  • the drive gear structure may be formed integrally onto the external circumference of the annular gear 4 (FIG. 2).
  • the annular gear 4 intermeshes with at least one planet gear 6 which meshes with a sun gear 5 of the planetary gear mechanism.
  • the sun gear 5 is mounted on a camshaft 2 which is rotatably supported in the casing 1 and on which the drive gear 3 is rotatably supported by means of a bearing 20 .
  • a planet carrier 7 is rotatably supported in the housing by means of a further bearing 19 .
  • the planet gear 6 is rotatably supported on the planet carrier 7 .
  • a plurality of planet gears 6 are provided evenly distributed over the circumference of the sun gear 5 .
  • An electric servomotor 10 whose motor housing is attached to the casing 1 is coupled to the planet carrier 7 by means of its motor shaft 11 and an actuating gear mechanism.
  • the actuating gear mechanism comprises a pinion 9 on the motor shaft 11 and a gear mechanism wheel 8 , which is connected to the planet carrier 7 , or, preferably, is formed integrally there-with.
  • the pinion 9 and the gear mechanism wheel 8 may be embodied in numerous variations, for example as straight-toothed or obliquely toothed cylindrical gears, as a worm-gear, as a spindle gear, or as bevel gears or the like.
  • An actuating gear mechanism with a plurality of gear mechanism stages may also be provided between the motor shaft 11 and the planet carrier 7 .
  • the planet carrier 7 is rotatably supported but held in position in the casing 1 by means of the holding torque of the servomotor 10 so that the planet gears 6 rotate in the direction of the arrow 16 when the drive wheel 3 is rotated in the direction of arrow 15 and the sun gear 5 is driven together with the camshaft 2 , in the direction of the arrow 17 .
  • the camshaft 2 has a defined relative rotary position with respect to the crankshaft. If this rotary position is to be changed, the servomotor 10 , whose motor shaft 11 is rotated through a defined angular range in the direction of the arrows 18 with the integrally formed-on pinion 9 in the form of a worm, is activated.
  • the degree of adjustment is determined by an electronic control unit 12 as a function of the relevant operating parameters of the internal combustion engine.
  • the gear mechanism wheel 8 is rotated in the direction of the arrow 14 and then held in the new position.
  • the gear mechanism wheel 8 may be biased in the direction of the holding torque by means of a pre-stressed spring element 13 .
  • the spring element 13 which may be, for example, a helical spring or any other suitable spring element, biases the servomotor 10 drive shaft in the direction of the holding torque, while it is correspondingly pre-stressed when the actuating movement is in the opposite direction.
  • the over-all step-down ratio between the crankshaft and the camshaft 2 , i ges must be two to one in a four-stroke internal combustion engine.
  • the device according to the invention thus provides numerous possibilities for using the installation space available for the camshaft drive in an optimum way and reducing the weight and the masses of inertia of the internal combustion engine by means of small components.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US10/360,440 2002-02-07 2003-02-07 Device for controlling the relative rotary position between a crankshaft and a camshaft Abandoned US20030145816A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10205034.1 2002-02-07
DE10205034A DE10205034A1 (de) 2002-02-07 2002-02-07 Vorrichtung zum geregelten Verstellen der relativen Drehlage zwischen einer Kurbelwelle und einer Nockenwelle

Publications (1)

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US20030145816A1 true US20030145816A1 (en) 2003-08-07

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US10/360,440 Abandoned US20030145816A1 (en) 2002-02-07 2003-02-07 Device for controlling the relative rotary position between a crankshaft and a camshaft

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US (1) US20030145816A1 (de)
DE (1) DE10205034A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100064998A1 (en) * 2007-04-13 2010-03-18 Thomas Hale Adjustable camshaft with a planetary gear
WO2015187469A1 (en) * 2014-06-05 2015-12-10 Borgwarner Inc. Electric cam phaser with fixed sun planetary
KR101720768B1 (ko) * 2016-03-22 2017-04-10 캄텍주식회사 연속 가변 밸브 구동용 액츄에이터
KR101720785B1 (ko) * 2016-03-22 2017-04-10 캄텍주식회사 연속 가변 밸브 구동용 액츄에이터
CN107013630A (zh) * 2017-05-13 2017-08-04 上乘精密科技（苏州）有限公司 一种适用于圆周摆往复运动的传动减速组件
KR101801085B1 (ko) * 2016-03-22 2017-12-20 캄텍주식회사 연속 가변 밸브 구동용 액츄에이터

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004038171A1 (de) * 2004-08-06 2006-03-16 Daimlerchrysler Ag Vorrichtung zum Verstellen einer Nockenwelle sowie Verfahren zum Betreiben einer Vorrichtung zum Verstellen einer Nockenwelle
DE102005023006B4 (de) * 2005-05-19 2019-05-23 Daimler Ag Nockenwellenverstelleinrichtung
DE102005059884A1 (de) 2005-12-15 2007-07-05 Schaeffler Kg Nockenwellenversteller
DE102005059840A1 (de) 2005-12-15 2007-06-28 Schaeffler Kg Nockenwellenversteller
DE102005059860A1 (de) 2005-12-15 2007-07-05 Schaeffler Kg Nockenwellenversteller
DE102006007584A1 (de) 2006-02-18 2007-08-30 Schaeffler Kg Nockenwellenversteller mit einem Überlagerungsgetriebe
DE102006007651A1 (de) 2006-02-18 2007-09-06 Schaeffler Kg Nockenwellenversteller mit einem Überlagerungsgetriebe
DE102006016650B4 (de) 2006-04-08 2019-05-16 Schaeffler Technologies AG & Co. KG Nockenwellentrieb für eine Brennkraftmaschine
DE102006033425A1 (de) 2006-07-19 2008-02-21 Schaeffler Kg Gruppe mehrerer Nockenwellen mit Nockenwellenverstellern
DE102007049072B4 (de) 2007-10-12 2020-06-18 Schaeffler Technologies AG & Co. KG Phasenversteller für eine Brennkraftmaschine mit einer Oldham-Kupplung
DE102007054546A1 (de) 2007-11-15 2009-05-20 Schaeffler Kg Elektromechanisches Verstellsystem
CZ308187B6 (cs) * 2015-09-04 2020-02-12 Ĺ KODA AUTO a.s. Zařízení pro variabilní natáčení vačkové hřídele spalovacího motoru

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4305352A (en) * 1977-09-30 1981-12-15 Kabushiki Kaisha Toyota Chuo Kenkyusho Internal combustion engine
US4802376A (en) * 1985-05-09 1989-02-07 Stidworthy Frederick M Variable phase and oscillatory drives
US5174253A (en) * 1991-01-11 1992-12-29 Toyota Jidosha Kabushiki Kaisha Apparatus for shifting phase between shafts in internal combustion engine
US5680837A (en) * 1996-09-17 1997-10-28 General Motors Corporation Planetary cam phaser with worm electric actuator
US6328008B1 (en) * 1999-08-03 2001-12-11 Unisia Jecs Corporation Valve timing control system for internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19702670A1 (de) * 1997-01-25 1998-03-26 Daimler Benz Ag Variable Ventilsteuerung für Brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4305352A (en) * 1977-09-30 1981-12-15 Kabushiki Kaisha Toyota Chuo Kenkyusho Internal combustion engine
US4802376A (en) * 1985-05-09 1989-02-07 Stidworthy Frederick M Variable phase and oscillatory drives
US5174253A (en) * 1991-01-11 1992-12-29 Toyota Jidosha Kabushiki Kaisha Apparatus for shifting phase between shafts in internal combustion engine
US5680837A (en) * 1996-09-17 1997-10-28 General Motors Corporation Planetary cam phaser with worm electric actuator
US6328008B1 (en) * 1999-08-03 2001-12-11 Unisia Jecs Corporation Valve timing control system for internal combustion engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100064998A1 (en) * 2007-04-13 2010-03-18 Thomas Hale Adjustable camshaft with a planetary gear
US8327815B2 (en) * 2007-04-13 2012-12-11 Mahle International Gmbh Adjustable camshaft with a planetary gear
WO2015187469A1 (en) * 2014-06-05 2015-12-10 Borgwarner Inc. Electric cam phaser with fixed sun planetary
CN106460586A (zh) * 2014-06-05 2017-02-22 博格华纳公司 具有固定太阳行星齿轮系的电动凸轮相位器
US10107154B2 (en) 2014-06-05 2018-10-23 Borgwarner, Inc. Electric cam phaser with fixed sun planetary
KR101720768B1 (ko) * 2016-03-22 2017-04-10 캄텍주식회사 연속 가변 밸브 구동용 액츄에이터
KR101720785B1 (ko) * 2016-03-22 2017-04-10 캄텍주식회사 연속 가변 밸브 구동용 액츄에이터
KR101801085B1 (ko) * 2016-03-22 2017-12-20 캄텍주식회사 연속 가변 밸브 구동용 액츄에이터
CN107013630A (zh) * 2017-05-13 2017-08-04 上乘精密科技（苏州）有限公司 一种适用于圆周摆往复运动的传动减速组件

Also Published As

Publication number Publication date
DE10205034A1 (de) 2003-08-21

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AS Assignment

Owner name: DAIMLERCHRYSLER AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEHMANN, KAI;REEL/FRAME:013756/0086

Effective date: 20030128

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION