EP2676012A1 - 3-wellen-verstellgetriebe mit integrierter überlastkupplung - Google Patents
3-wellen-verstellgetriebe mit integrierter überlastkupplungInfo
- Publication number
- EP2676012A1 EP2676012A1 EP11793440.6A EP11793440A EP2676012A1 EP 2676012 A1 EP2676012 A1 EP 2676012A1 EP 11793440 A EP11793440 A EP 11793440A EP 2676012 A1 EP2676012 A1 EP 2676012A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- actuator
- mechanism according
- adjusting mechanism
- drive
- 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.)
- Granted
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
- F01L1/34—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
- F01L1/352—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
Definitions
- the invention relates to a 3-shaft adjusting according to the preamble of claim 1 with a rotatably connected to a drive shaft driving part, a rotatably connected to an output shaft driven part and a rotatably connected to an adjusting actuator.
- 3-shaft adjusting are used for example in internal combustion engines for adjusting phase angles, primarily for adjusting the opening and closing times of the gas exchange valves used (camshaft adjuster, phaser for actuator shafts in variable valve trains).
- the phase adjuster is arranged as an actuator in a 3-shaft system.
- Primary power is supplied to the 3-shaft system through the drive shaft (sprocket), which is output through the output shaft (e.g., camshaft).
- the actuator is arranged as a link between the drive shaft and the shaft to be driven in the power flow. It allows a third wave (adjusting shaft) superimposed to drive power additionally coupled mechanical power into the shaft system or dissipate therefrom.
- the predetermined by the drive shaft movement function phase angle
- 3-shaft adjusting gear examples include swash plate gear and mecanical gear, which are described for example in WO 2006/018080. These also include the wave gears known from WO 2005/080757 and the gears contained in US 2007/0051332 A1 and US 2003/0226534 A1.
- phasers are known in the art.
- DE 10 2004 009 128 A1 DE 10 2005 059884 A1 and DE 10 2004 038 681 A1 describes electromechanical camshaft adjusters.
- an electromechanical camshaft adjuster is known in which the Versteilmotor is connected by means of a releasable coupling with the adjusting gear. By an appropriate design of the coupling transmittable to the adjusting torque can be limited. This then acts as a safety clutch.
- a special case of a 3-shaft variable speed is a 2-shaft arrangement in adjusting drives, in which the drive shaft is fixed to the housing, d. H. only power is transferred between the adjusting shaft and the output shaft.
- Such an apparatus serves to convert a drive power inputted at a high speed and a low load into a low-speed and high-load output, and finds application in, for example, automotive type reduction drives as well as in industrial applications, e.g. robotics.
- the adjustment range or the drive range is limited by limiting the angle of rotation of one of the three shafts relative to a second shaft or relative to the housing.
- a mechanical stop is used as an integral part of the device.
- the stop between the output shaft and the drive shaft is provided, since the adjusting shaft usually covers an angle of more than 360 °.
- the adjustment shaft which is not limited directly in the adjustment angle or drive angle, is then braked in the case of the stop via the transmission kinematics and the rigidity of the transmission elements as soon as the output side reaches the limit of the rotation angle.
- gear parts can deform so much that they collide with each other and bring the actuator to jamming.
- Farther Gear parts can tire prematurely or must be oversized for normal operation in order to endure the high loads in the case of unbraked stop.
- the object of Einfindung is to form a 3-shaft adjustment such that the pulse loads occurring when reaching a stop in the actuator are so attenuated in their effect that jamming or damage to the transmission is prevented.
- the solution of the problem is achieved with a 3-shaft adjusting with the features of claim 1, through which a decoupling of the gear parts is achieved in the case of a stop.
- a 3-shaft adjusting initially comprises in a known manner with a drive shaft rotatably connectable drive part, a rotatably connected to an output shaft driven part and a rotatably connected to an adjusting shaft of an actuator actuator. Between two of the three shafts, usually between the drive part and the output part, a first mechanical stop for limiting an adjustment angle between the drive shaft and the output shaft is provided.
- an over-load clutch integrated in the actuator is provided between the actuator and the drive part or between the actuator and the output part.
- an electromechanical camshaft adjuster with a corrugated transmission is assumed as a particularly preferred embodiment in a flat construction.
- the solutions are transferable to wave gear in pot design as on other types of transmissions.
- the invention is also applicable to other forms of transmission in which the actuator has a spur gear.
- the advantages of the invention are to be seen in particular in that a complete decoupling without an additional transmission component is possible. Due to the high speeds of the adjusting shaft, only small loads occur at this, so that an "oversnapping", that is to say a snap-over of the adjusting shaft, appears as an inexpensive and space-saving solution for a friction clutch.
- the overload clutch is formed by the fact that the actuator has a spur gear in the radial direction with an elasticity.
- the elasticity may be formed for example by an elastic layer or by elastic rolling elements, wherein as elastic rolling elements, e.g. Hollow balls or sleeves or rolling elements are made of a material with a lower modulus of elasticity.
- elastic rolling elements e.g. Hollow balls or sleeves or rolling elements are made of a material with a lower modulus of elasticity.
- the concept according to the invention is based on a torsionally soft toothing of the actuator. Due to the inertia of the adjusting shaft and the electric motor, a so-called collision torque occurs in the event of an impact, which causes a radial tooth force in the toothing parts in analogy to the normal engagement angle in addition to the tangential tooth force.
- the radial stiffness of the actuator normally counteracts this force.
- the radial elasticity is to be dimensioned such that, starting from a certain amount of the radial force component of the transmitted torque (for example, the collision moment), the teeth of two corresponding gear wheels radially dodge one another. The teeth then move tangentially together under high radial tension on the tooth heads until they are pushed back into the tooth space and snap over the adjusting shaft.
- Fig. 2 an inventive overload clutch on a wave generator as
- Fig. 3 an overload clutch according to the invention to a wave generator as
- FIG. 1 shows the contact conditions in a transmission at the time of over-snapping (oversensing). Shown are a ring gear 01 with internal teeth 02 and a spur gear 03 with external teeth 04.
- the spur gear 03 here forms an actuator of a 3-shaft variable-speed gear, not shown, while the ring gear 01 may be part of a drive part or driven part.
- the direction of rotation of the spur gear 03 is represented by an arrow 05. It can be seen that the tooth tips of the spur gear 03 yield in the radial direction and slide along the tooth tips of the internal teeth 02, before the teeth re-immerse each other due to the elasticity.
- over-snapping in the gearing 02, 04 is permitted in the event of an overload and the resulting stresses on the gearing members are reduced.
- the rigidity, and thus the radial strain in case of overload is chosen so that the oversensing of the affected transmission components can be tolerated at least time within the required life of the actuator. In addition, no damage may occur in the toothing or in the bearings, which impair the function. could do.
- the time-stable design is permissible since the operating state shown will only occur under boundary conditions.
- the rigidity must be high enough to transmit the operating moments.
- the snap-over within the teeth 02, 04 can be regarded as complete cyclic decoupling.
- Fig. 2 shows an overload clutch according to the invention on a wave generator as an actuator of a 3-shaft variable speed drive in a first embodiment. Shown is a detail of the wave generator with an elliptical inner ring 06, an elliptical outer ring 07 and arranged therebetween rolling elements 08.
- the outer ring 07 carries in a known manner a spur toothing 09, which rolls in a ring gear, not shown (see Fig. 1).
- an elastic layer 1 is arranged, which ensures the radial compliance of the spur toothing 09.
- the elastic layer 11 may be a separately made ring or a coating of an elastomer. The necessary thickness and elasticity of the elastic layer 11 can be determined by the person skilled in the art on the basis of the given material and gear data.
- an overload clutch according to the invention is shown on a wave generator as an actuator of a 3-shaft variable speed drive in a second embodiment.
- the elastic layer is formed by a corrugated sheet metal sleeve 12, are impressed in the corrugations.
- sheet metal sleeves are also known as tolerance rings for clearance compensation during bearing mounting.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Retarders (AREA)
- Gears, Cams (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011004071A DE102011004071A1 (de) | 2011-02-14 | 2011-02-14 | 3-Wellen-Verstellgetriebe mit integrierter Überlastkupplung |
PCT/EP2011/072075 WO2012110131A1 (de) | 2011-02-14 | 2011-12-07 | 3-wellen-verstellgetriebe mit integrierter überlastkupplung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2676012A1 true EP2676012A1 (de) | 2013-12-25 |
EP2676012B1 EP2676012B1 (de) | 2014-10-22 |
Family
ID=45217566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11793440.6A Not-in-force EP2676012B1 (de) | 2011-02-14 | 2011-12-07 | 3-wellen-verstellgetriebe mit integrierter überlastkupplung |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130312682A1 (de) |
EP (1) | EP2676012B1 (de) |
DE (1) | DE102011004071A1 (de) |
WO (1) | WO2012110131A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014202060A1 (de) * | 2014-02-05 | 2015-08-06 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller und Verfahren zum Betrieb eines Nockenwellenverstellers |
DE102017111223B3 (de) | 2017-05-23 | 2018-09-13 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller |
DE102017113365A1 (de) | 2017-06-19 | 2018-05-09 | Schaeffler Technologies AG & Co. KG | Wellgetriebe |
DE102019128653B3 (de) * | 2019-10-23 | 2021-01-14 | Minebea Mitsumi Inc. | Stellantrieb |
US11454140B1 (en) | 2021-11-09 | 2022-09-27 | Borgwarner Inc. | Torque-limiting rotor coupling for an electrically-actuated camshaft phaser |
US11454141B1 (en) | 2021-11-09 | 2022-09-27 | Borgwarner Inc. | Torque limited variable camshaft timing assembly |
US11560815B1 (en) | 2022-06-02 | 2023-01-24 | Borgwarner Inc. | Compliant coupling for electrically-controlled variable camshaft timing assembly |
US11940030B1 (en) | 2022-10-24 | 2024-03-26 | Borgwarner Inc. | Torque-limiting torsion gimbal |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3187360A (en) * | 1963-10-04 | 1965-06-08 | Sunbeam Corp | Readily releasable drive connection for appliance |
US3487722A (en) * | 1968-03-06 | 1970-01-06 | Web Press Eng Inc | Harmonic drive and method for controlling speed |
US4806809A (en) * | 1986-06-12 | 1989-02-21 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Rotary shaft coupling device |
JPH07208491A (ja) * | 1994-01-28 | 1995-08-11 | Mitsubishi Electric Corp | オルダム継手 |
JP3986371B2 (ja) | 2002-06-07 | 2007-10-03 | 株式会社日立製作所 | 内燃機関のバルブタイミング制御装置 |
DE10248351A1 (de) | 2002-10-17 | 2004-04-29 | Ina-Schaeffler Kg | Elektrisch angetriebener Nockenwellenversteller |
DE102004009128A1 (de) | 2004-02-25 | 2005-09-15 | Ina-Schaeffler Kg | Elektrischer Nockenwellenversteller |
DE102004038681B4 (de) | 2004-08-10 | 2017-06-01 | Schaeffler Technologies AG & Co. KG | Elektromotorischer Nockenwellenversteller |
DE102005018956A1 (de) * | 2005-04-23 | 2006-11-23 | Schaeffler Kg | Vorrichtung zur Nockenwellenverstellung einer Brennkraftmaschine |
JP4390078B2 (ja) | 2005-09-05 | 2009-12-24 | 株式会社デンソー | バルブタイミング調整装置 |
DE102005059884A1 (de) | 2005-12-15 | 2007-07-05 | Schaeffler Kg | Nockenwellenversteller |
JP4735504B2 (ja) * | 2006-02-24 | 2011-07-27 | 株式会社デンソー | バルブタイミング調整装置 |
DE102008039007A1 (de) * | 2008-08-21 | 2010-02-25 | Schaeffler Kg | Verfahren zur Verstellung einer Kurbelwelle eines Verbrennungsmotors, Nockenwellenverstellsystem und Verbrennungsmotor mit verstellbarer Kurbelwelle |
-
2011
- 2011-02-14 DE DE102011004071A patent/DE102011004071A1/de not_active Ceased
- 2011-12-07 US US13/981,159 patent/US20130312682A1/en not_active Abandoned
- 2011-12-07 WO PCT/EP2011/072075 patent/WO2012110131A1/de active Application Filing
- 2011-12-07 EP EP11793440.6A patent/EP2676012B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2012110131A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20130312682A1 (en) | 2013-11-28 |
DE102011004071A1 (de) | 2012-08-16 |
WO2012110131A1 (de) | 2012-08-23 |
EP2676012B1 (de) | 2014-10-22 |
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