EP2297433A1 - Ventiltriebvorrichtung - Google Patents
VentiltriebvorrichtungInfo
- Publication number
- EP2297433A1 EP2297433A1 EP09765531A EP09765531A EP2297433A1 EP 2297433 A1 EP2297433 A1 EP 2297433A1 EP 09765531 A EP09765531 A EP 09765531A EP 09765531 A EP09765531 A EP 09765531A EP 2297433 A1 EP2297433 A1 EP 2297433A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching
- cam
- valve drive
- drive device
- unit
- 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
- 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
-
- 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
Definitions
- the invention relates to a valve drive device according to the preamble of claim 1.
- valve drive devices in particular an internal combustion engine, with an actuating device which is provided to displace at least a first axially displaceable cam member by means of a shift gate known.
- the invention is in particular the object of providing a valve drive device with a high flexibility. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.
- the invention relates to a valve drive device, in particular an internal combustion engine, with an actuating device which is provided to displace at least a first axially displaceable cam element by means of a shift gate.
- the actuating device is provided to switch the first cam element in at least three switching positions.
- a valve drive device can be realized, which has a high flexibility due to a high number of switching positions and thus can be easily adapted to different operating modes of the internal combustion engine, in particular different Brenn Anlagensmodi.
- a "switching position” is to be understood as meaning, in particular, a switching position of the cam element, which is in particular a defined cam lift. If the valve drive device has a plurality of cam elements, “identical switching positions” should be understood to mean that the cam elements have the same valve lift.
- the cam member has at least one cam set with at least three sub-cams, wherein advantageously each sub-cam a shift position and each cam set is assigned to a gas exchange valve.
- the shift gate on at least two other switching segments, which are intended to move a second cam member in the switching direction.
- a second cam element can also be moved into three switching positions.
- the shift gate has two further switching segments, which are arranged in the second slide track and which are intended to move the second cam member in the second switching direction.
- the shift gate is provided to sequentially shift the first cam element and the second cam element.
- the actuating device has a reset unit, which is intended to end a switching operation.
- a switching operation can be ended at a defined time, whereby a high number of possible combinations of the switching position can be achieved simply by means of the switching segments.
- the term "terminate” should be understood as meaning, in particular, a premature termination before an end of the shifting gate, in particular an interruption or an interruption. Switching operation "in particular a displacement of one of the cam elements to be understood.
- the reset unit is provided to end the switching process immediately after a displacement of the first cam member.
- the first cam element can thereby be displaced at least partially independently of the second cam element.
- the reset unit is provided to the switching operation after a move of the second cam element to finish.
- the second cam element can thereby be displaced at least partially independently of the first cam element.
- the reset unit has at least one switching unit with a switching element, which is intended to be moved by means of an actuator in a neutral position.
- the switching process can be completed easily and in particular independently of the shift gate.
- the shift gate has at least one intermediate segment, which is intended to end the switching operation.
- the switching operation can likewise be terminated simply and in particular independently of switching units of the actuating device by means of which the cam elements are displaced.
- FIG. 1 shows an actuating device of a valve drive device with two switching units in a cross section
- FIG. 5 shows schematically a shift gate of an actuating device of a further valve drive device in a planar view
- FIG. 6 shows a slide track of the shifting gate in a cross-section
- valve drive device in a schematic overview
- Fig. 8 is a switching unit of the actuator.
- FIG. 1 and FIG. 2 show an actuating device 10a of a valve drive device.
- the actuating device 10a is provided to move two cam elements 11a, 12a, which are arranged to be axially displaceable and rotationally fixed on a base camshaft 35a.
- the actuating device 10a has a first and a second switching unit 23a, 24a, which can displace the cam elements 11a, 12a by means of a shifting gate 13a.
- the shift gate 13a has a first slide track 36a and a second slide tracks 37a.
- the slide tracks 36a, 37a by means of which the cam elements 1 1a, 12a are moved, are designed as groove-shaped depressions and introduced directly into the cam elements 11a, 12a.
- the cam members 11a, 12a are L-shaped and axially overlapping in a region where they abut each other.
- In the circumferential direction takes in the region of the guide tracks 36a, 37a each cam member 11a, 12a a rotation angle of 180 ° degrees.
- the slide tracks 36a, 37a which extend over a rotational angle greater than 360 °, are each arranged in part on the cam member 11a and partly on the cam member 12a.
- Both slide tracks 36a, 37a have a basic shape with a quadruple S-shaped structure (compare Fig. 3). Both slide tracks 36a, 37a each have a single track segment 38a, 39a, four shift segments 14a-21a, three intermediate segments 29a-34a and a Ausspursegment 40a, 41a.
- the switching segments 14a, 16a, 18a, 20a of the first slide track 36a have an axial directional component that corresponds to a first shift direction is opposite, whereby by means of the switching segments 14a, 16a, 18a, 20a and a rotational movement of the cam member 11a, an axial force for switching in the first switching direction can be generated.
- the switching segments 15a, 17a, 19a, 21a of the second slide track 37a have an axial direction component which is directed axially opposite to a second switching direction, whereby an axial force for switching in the second switching direction can be generated analogously.
- the first slide track 36a alternately one of the shift segments 14a, 16a, 18a, 20a and one of the intermediate segments 29a, 31a, 33a are arranged following the single track segment 38a, the switch segment 14a following directly on the single track segment 38a.
- the Ausspursegment 40a is arranged.
- the single track segment 38a has an increasing radial depth.
- the intermediate segments 29a, 31a, 33a and the switching segments 14a, 16a, 18a, 20a have a constant radial depth.
- the Ausspursegment 40a has a decreasing radial depth. Due to the decreasing radial depth of the Ausspursegments 40a, the switching element 25a of the switching unit 23a is moved back to its neutral position in which it is out of engagement with the shift gate 13a back.
- the single track segment 38a, the intermediate segments 29a, 31a, 33a and the Ausspursegment 40a are each arranged in part on the cam member 11a and partially on the cam member 12a.
- the switching segments 14a, 16a, 18a, 20a are each completely arranged on one of the cam elements 11a, 12a, wherein successive switching segments 14a, 16a, 18a, 20a are arranged alternately on the cam elements 11a, 12a.
- the switching segment 14a and the switching segment 18a are provided to displace the cam member 11a.
- the switching segment 16a and the switching segment 20a are provided to displace the cam member 12a.
- the second slide track 37a is formed analogously to the first slide track 36a. Following the engagement segment 39a, alternately one of the switching segments 15a, 17a, 19a, 21a and one of the intermediate segments 30a, 32a, 34a are also arranged. The last switching segment 21a is immediately followed by the Ausspursegment 41a.
- the one-track segment 39a, the intermediate segments 30a, 32a, 34a and the Ausspursegment 41a are each arranged in part on the cam member 11a and partly on the cam member 12a.
- the switching segments 15a, 17a, 19a, 21a are in each case arranged completely on one of the cam elements 11a, 12a, whereby successive switching elements segments 15a 17a, 19a, 21a are arranged alternately on the cam elements 11a, 12a, which they can move.
- the cam element 11a and the cam element 12a each have at least one cam unit 43a, 47a with three partial cams 44a-46a, 48a-50a.
- the partial cams 44a-46a, 48a-50a have a different lifting height and are assigned to the switching positions of the cam elements 11a, 12a.
- the partial cams 44a, 48a with the highest lifting height are assigned to the switching positions with a full stroke.
- the partial cams 45a, 49a with a medium lifting height are assigned to the switching positions with a partial stroke.
- the partial cams 46a, 50a with the lowest lifting height which is advantageously equal to zero, are assigned to the switching positions with a zero stroke.
- the highest lift part cams 44a, 48a and the lowest lift lift partial cams 46a, 50a are disposed outboard in the respective cam units 43a, 47a.
- the partial cams 45a, 49a with the medium lift height are arranged between the other partial cams 44a, 46a, 48a, 50a of the corresponding cam unit 43a, 47a.
- the second switching unit 24a has a second actuator 28a and a second switching element 26a.
- the second switching element 26a is also partially formed as a switching pin 52a, which is extended in a switching position of the second switching element 26a. In a switching position, the switching pin 52a engages in a second slide track 37a of the shift gate 13a.
- the cam elements 11a, 12a can be moved in the second, the first switching direction opposite switching direction.
- the cam elements 11a, 12a are partially coupled in terms of motion technology via the shift gate 13a. By means of the actuating device 10a, the cam elements 11a, 12a can be displaced sequentially.
- the cam elements 1 1a, 12a are thereby displaced as a function of a rotational angle of the base camshaft 35a or of the cam elements 11a, 12a.
- first the first cam member 11a is displaced, and subsequently, when the first cam member 11a is completely shifted, the second cam member 12a is displaced.
- second switching direction first the second cam element 12a and then the first cam element 11 a is moved.
- the cam elements 11a, 12a are always displaced in a base circle phase of their cam units 43a, 47a.
- the first cam member 11 a is made in two parts and has two cam member parts 53 a, 54 a, which are arranged on both sides of the cam member 12 a.
- the cam members 53a, 54a are fixedly connected to each other by means of an inner coupling rod 55a for axial movement. In principle, it is also conceivable to arrange the two cam element parts 53a, 54a adjacent and to make them in one piece.
- the first actuator 27a which moves the first switching element 25a, has a solenoid unit 56a.
- the solenoid unit 56a includes a coil 57a disposed in a stator 58a of the solenoid unit 56a.
- a magnetic field can be generated, which interacts with a permanent magnet 59a, which is arranged in the switching element 25a.
- the switching element 25a can be extended with the switching pin 51a.
- a core 60a amplifies the magnetic field generated by the solenoid unit 56a.
- the permanent magnet 59a interacts with the field of the solenoid unit 56a.
- an attractive force and a repulsive force can be realized.
- a polarization tion of the solenoid unit 56a can be changed by means of a current direction with which the electromagnet unit 56a is energized.
- the electromagnet unit 56a is energized in the current direction in which the repulsive force arises between the electromagnet unit 56a and the permanent magnet 59a.
- the second actuator 28a is constructed analogously to the first actuator 27a. It comprises a solenoid unit 62a, which has a coil 63a, arranged in the stator 58a, which is jointly designed for both actuators 27a, 28a, with a magnetisable core 64a, which interacts with a permanent magnet 65a arranged in the switching element 26a and can extend the switching pin 52a. An extension operation is also accelerated in the actuator 28a by a spring unit 66a.
- the two actuators are arranged in a common base housing part 67a, which at the same time forms the integrally formed stator 58a of the actuators 27a, 28a.
- the coils 57a 63a of the actuators 27a, 28a are also wound around the base housing part 67a.
- another housing part 68a is connected to the basic housing part 67a.
- the further housing part 68a encloses both actuators 27a, 28a.
- the housing part 68a guides for the switching elements 25a, 26a.
- the actuating device 10a has a coupling element 69a, by means of which the first switching element 25a and the second switching element 26a are coupled with each other in terms of movement (see Fig. 1 and Fig. 2).
- the coupling element 69a couples the two switching elements 25a, 26a complementary to each other.
- the second switching element 26a can be moved by means of the first actuator 27a and the first switching element 25a by means of the second actuator 28a in the neutral position.
- the coupling element 69a thus forms part of a reset unit 22a, by means of which the switching elements 25a, 26a can be returned to their neutral positions and thus a switching operation can be terminated prematurely.
- the coupling element 69a is rotatably mounted between the switching elements 25a, 26a.
- the two switching elements 25a, 26a each have a recess 70a, 71a into which the coupling element 69a engages.
- the switching elements 25a, 26a are connected to each other in terms of motion.
- the coupling element 69a thereby provides a rocking mechanism which couples the switching elements 25a, 26a in a complementary manner.
- the second switching element 26a is moved by means of the first actuator 27a in the neutral position by the first switching element 25a is moved to the switching position.
- the first switching element 25a is moved by means of the second actuator 28a in the neutral position by the second switching element 26a is moved to the switching position.
- both switching elements 25a, 26a can be moved back into the basic position by means of the Ausspursegmente 40a, 41a.
- the actuator 27a, 28a of the switching element 25a, 26a which is to be moved into the neutral position, additionally energized in the current direction in which the solenoid unit 56a, 62a exerts an attractive force and the movement of the switching element 25a, 26a supported in the neutral position.
- the cam member 11a can be switched to the switching position with partial stroke and the cam member 12a in the switching position with zero stroke.
- the switching element 25 a of the first switching unit 23 a is extended and engages in the first slide track 36 a.
- the cam member 11a is moved from the switching position with zero stroke in the switching position with partial stroke.
- the switching element 26a of the second switching unit 24a is extended.
- the second switching element 26a spurts into the Ausspursegment 41a of the second slide track 37a.
- the switching element 25a of the first switching unit 23a is moved back to the neutral position.
- the switching element 26a of the second switching unit 24a is moved back into its neutral position by the Ausspursegment 41a.
- FIGS. 5 to 8 show a further exemplary embodiment of the invention.
- the letter a in the reference numerals of the embodiment in Figures 1 to 4 is replaced by the letter b in the reference numerals of the embodiment in Figures 5 to 8.
- FIG. 5 shows a further exemplary embodiment of a shift gate 13b of an actuating device 10b of a valve drive device.
- the actuating device 10b is provided to move two cam elements 11b, 12b, which are arranged to be axially displaceable and rotationally fixed on a base camshaft 35b.
- the actuating device 10b has a first switching unit 23b and a second switching unit 24b, which can shift the cam elements 11b, 12b by means of the shifting gate 13b.
- the shift gate 13b has a first slide track 36b and a second slide tracks 37b.
- the slide tracks 36b, 37b by means of which the cam elements 11b, 12b can be moved, are designed as groove-shaped depressions and introduced directly into the cam elements 11b, 12b.
- the cam members 11b, 12b are L-shaped and axially overlapping in an area where they are adjacent to each other (see Fig. 7).
- each cam element 11b, 12b assumes a rotational angle of 180 °.
- the slide tracks 36b, 37b which extend over a rotational angle greater than 360 ° degrees, are arranged in each case partly on the cam element 11b and partly on the cam element 12b.
- the switching segments 14b, 16b, 18b, 20b and one of the intermediate segments 29b, 31b, 33b are arranged following the single track segment 38b, the switching segment 14b immediately following the single track segment 38b.
- the Ausspursegment 40b is arranged.
- the single track segment 38b has an increasing radial depth.
- the switching segments 14b, 16b, 18b, 20b have a constant radial depth.
- the Ausspursegment 40b has a decreasing radial depth. Due to the decreasing radial depth of the Ausspursegments 40b, a switching element 25b of the first switching unit 23b is moved back to its neutral position in which it is out of engagement with the shift gate 13b.
- the one-track segment 38b, the intermediate segments 29b, 31b, 33b and the Ausspursegment 40b are each arranged in part on the cam member 11b and partially on the cam member 12b.
- the switching segments 14b, 16b, 18b, 20b are each completely arranged on one of the cam elements 11b, 12b, wherein successive switching segments 14b, 16b, 18b, 20b are arranged alternately on the cam elements 11b, 12b.
- the switching segment 14b and the switching segment 18b are provided to move the cam member 11b.
- the switching segment 16b and the switching segment 20b are provided to displace the cam member 12b.
- the second slide track 37b is formed analogously to the first slide track 36b. Subsequent to the Einspursegment 29b also alternately one of the switching segments 15b, 17b, 19b, 21b and one of the intermediate segments 30b, 32b, 34b are arranged. The last switching segment 21 b is immediately followed by the Ausspursegment 41 b.
- the Einspursegment 38b, the intermediate segments 30b, 32b, 34b and the Ausspursegment 41 b are each arranged in part on the cam member 11 b and partly on the cam member 12b.
- the switching segments 15b, 17b, 19b, 21b are each completely arranged on one of the cam elements 11b, 12b, wherein successive switching segments 15b, 17b, 19b, 21b are arranged alternately on the cam elements 11b, 12b, which they can move.
- the cam element 11b and the cam element 12b each have at least one cam unit 43b, 47b with three partial cams 44b-46b, 48b-50b.
- the partial cams 44b-46b, 48b-50b have a different lifting height and are switch positions of the cam elements 11b, 12b assignable.
- the partial cams 44b, 48b with the highest lifting height are associated with switch positions with a full stroke.
- the partial cams 45b, 49b with a medium lifting height are associated with switching positions with a partial stroke.
- the partial cams 46b, 50b with the lowest lifting height which is advantageously equal to zero, are associated with switching positions with a zero stroke.
- the highest lift part cams 44b, 48b and the lowest lift lift partial cams 46b, 50b are disposed outwardly in the respective cam units 43b, 47b.
- the intermediate cam partial cams 45b, 49b are disposed between the other partial cams 44b, 46b, 48b, 50b of the corresponding cam unit 43b, 47b.
- the first actuator 27b which moves the first switching element 25b, has a solenoid unit 56b.
- the solenoid unit 56b includes a coil 57b disposed in a stator 58b of the solenoid unit 56b.
- a magnetic field can be generated, which interacts with a permanent magnet 59b, which is arranged in the switching element 25b.
- the switching element 25b can be extended with the switching pin 51b.
- a core 60b amplifies the magnetic field generated by the solenoid unit 56b.
- the permanent magnet 59b interacts with the surrounding material.
- the second switching unit 24b is designed analogously to the first switching unit 23b.
- the second switching unit 23b has a switching pin 52b, which engages in the switching path 36b in a switching position of the switching element 25b.
- the cam elements 1 1 b, 12b are moved in the second, the first switching direction opposite switching direction.
- the cam elements 11 b, 12 b are partially coupled via the shift gate 13 b motion technology.
- the cam elements 11b, 12b can be displaced sequentially.
- the cam elements 1 1 b, 12b are shifted in response to a rotation angle of the base camshaft 35b.
- first the cam element 11b In the first switching direction, first the cam element 11b is displaced, and subsequently, when the cam element 11b is completely shifted, the cam element 11b is displaced. moved element 12b. In the second switching direction, first the cam element 12b and then the cam element 11b is displaced.
- the cam member 11 b is made in two parts and has two cam member parts 53 b, 54 b, which are arranged on both sides of the cam member 12 b.
- the cam member parts 53b, 54b are fixedly connected to each other by means of an inner coupling rod 55b for axial movement.
- each intermediate segment 29b-34b of the link tracks 36b, 37b of the shift gate 13b has a restoring element 72b-77b (see FIG 5).
- the switching element 25b, 26b which engages in the corresponding slide track 36b, 37b, are shifted back into its neutral position.
- the reset elements 72b-77b thus form a reset unit 22b, by means of which a switching operation can be terminated prematurely.
- the restoring elements 72b-77b are all made the same, which is why the following description of the restoring element 72b can also be analogously transferred to the remaining restoring elements 73b-77b.
- the return element 72b is designed as an elevation above a slide track base level 78b and arranged completely in the first slide track 36b. In the region of the restoring element 72b, a radial height 79b of a slide track base 80b increases or the radial depth of the first slide track 36b decreases.
- a radial extent 81b of the slide track which is formed by a distance between a shift gate base level 42b, which corresponds to the radial depth of the first slide track 36b, is always greater than zero (see FIG.
- the switching segment 18b is followed by the intermediate segment 33b with the return element 76b. While the switching element 25b passes through the intermediate segment 33b, energization of the actuator 27b is dispensed with. As a result, the switching element 25b is moved back by the restoring element 76b in its neutral position, whereby the switching element 25b is out of engagement with the first slide track 36b and the second cam member 12b remains in the switching position with partial stroke.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Branching, Merging, And Special Transfer Between Conveyors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008029325A DE102008029325A1 (de) | 2008-06-20 | 2008-06-20 | Ventiltriebvorrichtung |
PCT/EP2009/003902 WO2009152951A1 (de) | 2008-06-20 | 2009-05-30 | Ventiltriebvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2297433A1 true EP2297433A1 (de) | 2011-03-23 |
EP2297433B1 EP2297433B1 (de) | 2012-07-18 |
Family
ID=40886817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09765531A Active EP2297433B1 (de) | 2008-06-20 | 2009-05-30 | Ventiltriebvorrichtung |
Country Status (6)
Country | Link |
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US (1) | US8474424B2 (de) |
EP (1) | EP2297433B1 (de) |
JP (1) | JP5396624B2 (de) |
CN (1) | CN102066704B (de) |
DE (1) | DE102008029325A1 (de) |
WO (1) | WO2009152951A1 (de) |
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2008
- 2008-06-20 DE DE102008029325A patent/DE102008029325A1/de not_active Withdrawn
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2009
- 2009-05-30 EP EP09765531A patent/EP2297433B1/de active Active
- 2009-05-30 CN CN2009801230629A patent/CN102066704B/zh active Active
- 2009-05-30 WO PCT/EP2009/003902 patent/WO2009152951A1/de active Application Filing
- 2009-05-30 JP JP2011513904A patent/JP5396624B2/ja active Active
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2010
- 2010-11-05 US US12/927,117 patent/US8474424B2/en active Active
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EP2297433B1 (de) | 2012-07-18 |
CN102066704B (zh) | 2013-12-04 |
JP2011524493A (ja) | 2011-09-01 |
CN102066704A (zh) | 2011-05-18 |
WO2009152951A1 (de) | 2009-12-23 |
US8474424B2 (en) | 2013-07-02 |
JP5396624B2 (ja) | 2014-01-22 |
US20110079188A1 (en) | 2011-04-07 |
DE102008029325A1 (de) | 2009-12-24 |
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