EP2080893A1 - Valve assembly for an injection valve and injection valve - Google Patents

Valve assembly for an injection valve and injection valve Download PDF

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Publication number
EP2080893A1
EP2080893A1 EP08000959A EP08000959A EP2080893A1 EP 2080893 A1 EP2080893 A1 EP 2080893A1 EP 08000959 A EP08000959 A EP 08000959A EP 08000959 A EP08000959 A EP 08000959A EP 2080893 A1 EP2080893 A1 EP 2080893A1
Authority
EP
European Patent Office
Prior art keywords
sealing element
valve
cylinder head
valve body
injection
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
Application number
EP08000959A
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German (de)
French (fr)
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EP2080893B1 (en
Inventor
Luca Matteucci
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to DE200860003515 priority Critical patent/DE602008003515D1/en
Priority to EP20080000959 priority patent/EP2080893B1/en
Publication of EP2080893A1 publication Critical patent/EP2080893A1/en
Application granted granted Critical
Publication of EP2080893B1 publication Critical patent/EP2080893B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose fuel into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • Fuel can be supplied to the internal combustion engine by the injection valve that comprises the sealing arrangement.
  • the injection valves can be coupled to the cylinder head of the internal combustion engine in different manners.
  • the coupling of the injection valves to the cylinder head needs to be very precise to get a correct injection angle.
  • the object of the invention is to create a valve assembly for an injection valve being coupable to a cylinder head of a combustion engine which is simply to be manufactured and which facilitates a reliable and precise coupling between the valve assembly and the cylinder head of the combustion engine.
  • the invention is distinguished by a valve assembly for an injection valve.
  • the valve assembly comprises a valve body with a central longitudinal axis, an injection nozzle, and a sealing arrangement which is designed to sealingly couple the valve assembly with a cylinder head of a combustion engine.
  • the sealing arrangement comprises a first sealing element being in one piece with the valve body and being designed to be arranged between the valve body and the cylinder head, and a second sealing element being in one piece with the valve body and being designed to be arranged between the valve body and the cylinder head and being arranged in a given distance from the first sealing element in direction of the central longitudinal axis facing away from the injection nozzle.
  • valve assembly has a groove which is arranged between the first sealing element and the second sealing element.
  • the groove can take up sections of a gasket which can be arranged radially outside the first sealing element and the second sealing element in particular in the case of a thermal expansion of the gasket.
  • first sealing element and the second sealing element have a circular shape, and the first sealing element extends to a first radius and the second sealing element extends to a second radius.
  • the second radius is bigger than the first radius.
  • the invention is distinguished by an injection valve comprising a valve assembly.
  • Figure 1 shows an internal combustion engine 22, with an intake air tract 10, a motor block 12, a cylinder head 14 and an exhaust gas tract 16.
  • a combustion chamber 20 is arranged in the motor block 12 .
  • the cylinder head 14 comprises an injection valve 18 and a sparking plug 19.
  • a sealing arrangement 30 enables the sealing of the injection valve 18 in the cylinder head 14 of the combustion engine 22.
  • the fuel injector 18 ( figures 2 ) comprises an injector coupling portion 23 and a valve assembly 24.
  • the injector coupling portion 23 is designed to be coupled to a high-pressure fuel chamber of the internal combustion engine 22, the fuel is stored under high pressure, for example, under the pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine.
  • injection valve 18 is designed to be coupled to an electrical supply to actuate a not shown actuator unit of the injection valve 18.
  • the valve assembly 24 comprises a valve body 26 with a central longitudinal axis L and a cavity 27 which is axially led through the valve body 26 ( figure 3 ).
  • the valve assembly 24 further comprises a not shown valve needle taken in the cavity 27 of the valve body 26.
  • the cylinder head 14 has a recess 15 being designed to take up at least parts of the injection valve 18.
  • the cylinder head 14 has an inner surface 44 and an outer surface 46.
  • the inner surface 44 is facing the combustion chamber 20, and the outer surface 46 is facing the injector coupling portion 23 outside the cylinder head 14.
  • the valve body 26 has a valve body groove 36 wherein a first sealing element 32 and a second sealing element 34 are arranged.
  • the first sealing element 32 and the second sealing element 34 are part of the sealing arrangement 30.
  • the first sealing element 32 and the second sealing element 34 are in one piece with the valve body 26.
  • the first sealing element 32 and the second sealing element 34 are forming projections of the valve body 26 and are arranged between the valve body 26 and the cylinder head 14.
  • the first sealing element 32 and the second sealing element 34 are preferably designed to be arranged circumferentially over the valve body 26.
  • the first sealing element 32 and the second sealing element 34 have a circular shape. Consequently, the first sealing element 32 and the second sealing element 34 are forming ring elements with their centres on the central longitudinal axis L.
  • the first sealing element 32 and the second sealing element 34 are arranged in a predetermined distance D from each other in direction of the central longitudinal axis L.
  • the second sealing element 34 is arranged in a larger distance from the injection nozzle 28 as the first sealing element 32.
  • a groove 38 is arranged between the first sealing element 32 and the second sealing element 34 .
  • the recess 15 of the cylinder head 14 and the valve body groove 36 take up a gasket 40 which is arranged between the sealing elements 32, 34 of the valve body 26 and an inner wall 42 of the recess 15 of the cylinder head 14.
  • the gasket 40 is of a material which comprises PTFE which is suited to the temperatures usually occurring in the internal combustion engine 22.
  • the gasket 40 comprises particles of carbon.
  • the first sealing element 32 has a first radius R1 and the second sealing element 34 has a second radius R2 relative to the central longitudinal axis L.
  • the second radius R2 is bigger than the first radius R1.
  • the temperatures in the cylinder head 14 and in the valve body 26 usually decrease in direction of the central longitudinal axis L from the inner surface 44 to the outer surface 46 of the cylinder head 14. Consequently, the area of the first sealing element 32 and its adjacent area of the gasket 40 are usually exposed to a higher temperature than the second sealing element 34 and its adjacent area of the gasket 40.
  • first sealing element 32 and the second sealing element 34 together with the gasket 40 act as a sealing arrangement to prevent hot exhaust gases in the combustion chamber 20 to exit through the recess 15 in the cylinder head 14 which takes up the injection valve 18.
  • the second sealing element 34 together with the gasket 40 is able to prevent the hot exhaust gases of the combustion chamber 20 to leave the combustion chamber 20 through the recess 15 in the cylinder head 14.
  • the groove 38 which is arranged between the first sealing element 32 and the second sealing element 34 can take up parts of the gasket 40 in the case of a thermal expansion of the gasket 40. By this, a further sealing function of the first sealing element 32 and the second sealing element 34 together with the gasket 40 is possible.
  • the contact pressure between the second sealing element 34 and the gasket 40 is high.
  • the contact pressure between the second sealing element 34 and the gasket 40 is very high in the case of the thermal expansion of the gasket 40. This makes it possible to obtain a good sealing function between the valve body 26 and the cylinder head 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

Valve assembly (24) for an injection valve (18), comprising a valve body (26) with a central longitudinal axis (L), an injection nozzle (28), and a sealing arrangement (30) being designed to sealingly couple the valve assembly (24) with a cylinder head (14) of a combustion engine (22). The sealing arrangement (30) comprises a first sealing element (32) being in one piece with the valve body (26) and being designed to be arranged between the valve body (26) and the cylinder head (14), and a second sealing element (34) being in one piece with the valve body (26) and being designed to be arranged between the valve body (26) and the cylinder head (14) and being arranged in a given distance (D) from the first sealing element (32) in direction of the central longitudinal axis (L) facing away from the injection nozzle (28).

Description

  • The invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose fuel into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine. Fuel can be supplied to the internal combustion engine by the injection valve that comprises the sealing arrangement. The injection valves can be coupled to the cylinder head of the internal combustion engine in different manners.
  • The coupling of the injection valves to the cylinder head needs to be very precise to get a correct injection angle.
  • The object of the invention is to create a valve assembly for an injection valve being coupable to a cylinder head of a combustion engine which is simply to be manufactured and which facilitates a reliable and precise coupling between the valve assembly and the cylinder head of the combustion engine.
  • It is furthermore the object of the invention to create an injection valve that ensures a precise dosing of fuel.
  • The objects are achieved by the features of the independent claims. Advantageous embodiments of the invention are given in the sub-claims.
  • According to a first aspect the invention is distinguished by a valve assembly for an injection valve. The valve assembly comprises a valve body with a central longitudinal axis, an injection nozzle, and a sealing arrangement which is designed to sealingly couple the valve assembly with a cylinder head of a combustion engine. The sealing arrangement comprises a first sealing element being in one piece with the valve body and being designed to be arranged between the valve body and the cylinder head, and a second sealing element being in one piece with the valve body and being designed to be arranged between the valve body and the cylinder head and being arranged in a given distance from the first sealing element in direction of the central longitudinal axis facing away from the injection nozzle.
  • This has the advantage that a secure sealing coupling of the valve assembly in the cylinder head is possible even if only one of the sealing elements is in function.
  • In an advantageous embodiment the valve assembly has a groove which is arranged between the first sealing element and the second sealing element. This has the advantage that the groove can take up sections of a gasket which can be arranged radially outside the first sealing element and the second sealing element in particular in the case of a thermal expansion of the gasket.
  • In a further advantageous embodiment the first sealing element and the second sealing element have a circular shape, and the first sealing element extends to a first radius and the second sealing element extends to a second radius. The second radius is bigger than the first radius. This has the advantage that it is possible to obtain a high contact pressure in particular between the second sealing element and the cylinder head even in the case that only the second sealing elements is in function.
  • According to a second aspect the invention is distinguished by an injection valve comprising a valve assembly.
  • Exemplary embodiments of the invention are explained in the following with the aid of schematic drawings. These are as follows:
    • Figure 1
    an internal combustion engine in a schematic view,
    Figure 2
    an injection valve with a valve assembly and a cyl-inder head in a longitudinal section view, and
    Figure 3
    a cut-out III of figure 2 with the valve assembly and the cylinder head in a detailed longitudinal section view.
  • Elements of the same design and function that occur in different illustrations are identified by the same reference character.
  • Figure 1 shows an internal combustion engine 22, with an intake air tract 10, a motor block 12, a cylinder head 14 and an exhaust gas tract 16. In the motor block 12 a combustion chamber 20 is arranged.
  • The cylinder head 14 comprises an injection valve 18 and a sparking plug 19. A sealing arrangement 30 enables the sealing of the injection valve 18 in the cylinder head 14 of the combustion engine 22.
  • The fuel injector 18 (figures 2) comprises an injector coupling portion 23 and a valve assembly 24. The injector coupling portion 23 is designed to be coupled to a high-pressure fuel chamber of the internal combustion engine 22, the fuel is stored under high pressure, for example, under the pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine.
  • Furthermore, the injection valve 18 is designed to be coupled to an electrical supply to actuate a not shown actuator unit of the injection valve 18.
  • The valve assembly 24 comprises a valve body 26 with a central longitudinal axis L and a cavity 27 which is axially led through the valve body 26 (figure 3). The valve assembly 24 further comprises a not shown valve needle taken in the cavity 27 of the valve body 26. On a free end of the valve assembly 24 an injection nozzle 28 is formed which is closed or opened by an axial movement of the valve needle. In a closing position a fuel flow through the injection nozzle 28 is prevented. In an opening position fuel can flow through the injection nozzle 28 into the combustion chamber 20 of the internal combustion engine 22.
  • The cylinder head 14 has a recess 15 being designed to take up at least parts of the injection valve 18. The cylinder head 14 has an inner surface 44 and an outer surface 46. The inner surface 44 is facing the combustion chamber 20, and the outer surface 46 is facing the injector coupling portion 23 outside the cylinder head 14.
  • As can be best seen in figure 3 the valve body 26 has a valve body groove 36 wherein a first sealing element 32 and a second sealing element 34 are arranged. The first sealing element 32 and the second sealing element 34 are part of the sealing arrangement 30. The first sealing element 32 and the second sealing element 34 are in one piece with the valve body 26. Thus, the first sealing element 32 and the second sealing element 34 are forming projections of the valve body 26 and are arranged between the valve body 26 and the cylinder head 14. The first sealing element 32 and the second sealing element 34 are preferably designed to be arranged circumferentially over the valve body 26. Preferably, the first sealing element 32 and the second sealing element 34 have a circular shape. Consequently, the first sealing element 32 and the second sealing element 34 are forming ring elements with their centres on the central longitudinal axis L.
  • The first sealing element 32 and the second sealing element 34 are arranged in a predetermined distance D from each other in direction of the central longitudinal axis L. The second sealing element 34 is arranged in a larger distance from the injection nozzle 28 as the first sealing element 32.
  • Between the first sealing element 32 and the second sealing element 34 a groove 38 is arranged.
  • Furthermore, the recess 15 of the cylinder head 14 and the valve body groove 36 take up a gasket 40 which is arranged between the sealing elements 32, 34 of the valve body 26 and an inner wall 42 of the recess 15 of the cylinder head 14. Preferably, the gasket 40 is of a material which comprises PTFE which is suited to the temperatures usually occurring in the internal combustion engine 22. Preferably, the gasket 40 comprises particles of carbon.
  • The first sealing element 32 has a first radius R1 and the second sealing element 34 has a second radius R2 relative to the central longitudinal axis L. The second radius R2 is bigger than the first radius R1. By this a high contact pressure between the second sealing element 34 and the cylinder head 14 is available.
  • In the following, the function of the sealing arrangement 30 will be described in detail:
  • During the operation of the internal combustion engine 22, the temperatures in the cylinder head 14 and in the valve body 26 usually decrease in direction of the central longitudinal axis L from the inner surface 44 to the outer surface 46 of the cylinder head 14. Consequently, the area of the first sealing element 32 and its adjacent area of the gasket 40 are usually exposed to a higher temperature than the second sealing element 34 and its adjacent area of the gasket 40.
  • During operation of the internal combustion engine 22, usually the first sealing element 32 and the second sealing element 34 together with the gasket 40 act as a sealing arrangement to prevent hot exhaust gases in the combustion chamber 20 to exit through the recess 15 in the cylinder head 14 which takes up the injection valve 18.
  • Even in the case that due to the high temperatures near the first sealing element 32, the second sealing element 34 together with the gasket 40 is able to prevent the hot exhaust gases of the combustion chamber 20 to leave the combustion chamber 20 through the recess 15 in the cylinder head 14.
  • The groove 38 which is arranged between the first sealing element 32 and the second sealing element 34 can take up parts of the gasket 40 in the case of a thermal expansion of the gasket 40. By this, a further sealing function of the first sealing element 32 and the second sealing element 34 together with the gasket 40 is possible.
  • As the second radius R2 of the second sealing element 32 is larger than the first radius R1 of the first sealing element 32, the contact pressure between the second sealing element 34 and the gasket 40 is high. In particular, the contact pressure between the second sealing element 34 and the gasket 40 is very high in the case of the thermal expansion of the gasket 40. This makes it possible to obtain a good sealing function between the valve body 26 and the cylinder head 14.

Claims (4)

  1. Valve assembly (24) for an injection valve (18), comprising
    - a valve body (26) with a central longitudinal axis (L),
    - an injection nozzle (28), and
    - a sealing arrangement (30) being designed to sealingly couple the valve assembly (24) with a cylinder head (14) of a combustion engine (22), the sealing arrangement (30) comprising
    - a first sealing element (32) being in one piece with the valve body (26) and being designed to be arranged between the valve body (26) and the cylinder head (14), and
    - a second sealing element (34) being in one piece with the valve body (26) and being designed to be arranged between the valve body (26) and the cylinder head (14) and being arranged in a given distance (D) from the first sealing element (32) in direction of the central longitudinal axis (L) facing away from the injection nozzle (28).
  2. Valve assembly (24) in accordance with claim 1, with a groove (38) being arranged between the first sealing element (32) and the second sealing element (34).
  3. Valve assembly (24) in accordance with claim 1 or 2, with
    - the first sealing element (32) and the second sealing element (34) having a circular shape,
    - the first sealing element (32) extending to a first radius (R1) and the second sealing element (34) extending to a second radius (R2), wherein
    the second radius (R2) is bigger than the first radius (R1).
  4. Injection valve (18) comprising a valve assembly (24) according to one of the preceding claims.
EP20080000959 2008-01-18 2008-01-18 Valve assembly for an injection valve and injection valve Active EP2080893B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200860003515 DE602008003515D1 (en) 2008-01-18 2008-01-18 Valve arrangement for an injection valve and injection valve
EP20080000959 EP2080893B1 (en) 2008-01-18 2008-01-18 Valve assembly for an injection valve and injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080000959 EP2080893B1 (en) 2008-01-18 2008-01-18 Valve assembly for an injection valve and injection valve

Publications (2)

Publication Number Publication Date
EP2080893A1 true EP2080893A1 (en) 2009-07-22
EP2080893B1 EP2080893B1 (en) 2010-11-17

Family

ID=39537868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080000959 Active EP2080893B1 (en) 2008-01-18 2008-01-18 Valve assembly for an injection valve and injection valve

Country Status (2)

Country Link
EP (1) EP2080893B1 (en)
DE (1) DE602008003515D1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2607679A1 (en) * 2011-12-21 2013-06-26 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
US9574536B2 (en) 2012-11-20 2017-02-21 Denso Corporation Fuel injector
US9632132B2 (en) 2012-06-04 2017-04-25 Continental Automotive Gmbh Test device for testing a flat module
US9771911B2 (en) 2013-08-23 2017-09-26 Denso Corporation Fuel injection valve
WO2019052718A1 (en) * 2017-09-13 2019-03-21 Robert Bosch Gmbh Fuel injector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002012717A1 (en) * 2000-08-05 2002-02-14 Robert Bosch Gmbh Fuel injection valve
DE10103933A1 (en) 2001-01-30 2002-08-14 Bosch Gmbh Robert Fuel injector
EP1357284A1 (en) * 2000-12-26 2003-10-29 Toyota Jidosha Kabushiki Kaisha Combustion gas seal for injector and sealing structure with the combustion gas seal
JP2004239124A (en) * 2003-02-05 2004-08-26 Hitachi Ltd Fuel injection valve and cylinder injection engine
DE10321163A1 (en) * 2003-05-12 2004-12-02 Robert Bosch Gmbh Applying sealing element, especially to fuel injection valve, involves sliding tubular metal semi-finished product on as far as groove region and re-shaping to form sealing element in groove

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002012717A1 (en) * 2000-08-05 2002-02-14 Robert Bosch Gmbh Fuel injection valve
EP1357284A1 (en) * 2000-12-26 2003-10-29 Toyota Jidosha Kabushiki Kaisha Combustion gas seal for injector and sealing structure with the combustion gas seal
DE10103933A1 (en) 2001-01-30 2002-08-14 Bosch Gmbh Robert Fuel injector
JP2004239124A (en) * 2003-02-05 2004-08-26 Hitachi Ltd Fuel injection valve and cylinder injection engine
DE10321163A1 (en) * 2003-05-12 2004-12-02 Robert Bosch Gmbh Applying sealing element, especially to fuel injection valve, involves sliding tubular metal semi-finished product on as far as groove region and re-shaping to form sealing element in groove

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2607679A1 (en) * 2011-12-21 2013-06-26 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
WO2013092366A1 (en) * 2011-12-21 2013-06-27 Continental Automotive Gmbh Valve assembly for an injection valve and injection valve
CN103998765A (en) * 2011-12-21 2014-08-20 大陆汽车有限公司 Valve assembly for an injection valve and injection valve
KR20140105596A (en) * 2011-12-21 2014-09-01 콘티넨탈 오토모티브 게엠베하 Valve assembly for an injection valve and injection valve
US20150060573A1 (en) * 2011-12-21 2015-03-05 Continental Automotive Gmbh Valve Assembly for an Injection Valve and Injection Valve
US9976529B2 (en) * 2011-12-21 2018-05-22 Continental Automotive Gmbh Valve assembly for an injection valve and injection valve
KR102011070B1 (en) 2011-12-21 2019-08-14 콘티넨탈 오토모티브 게엠베하 Valve assembly for an injection valve and injection valve
US9632132B2 (en) 2012-06-04 2017-04-25 Continental Automotive Gmbh Test device for testing a flat module
US9574536B2 (en) 2012-11-20 2017-02-21 Denso Corporation Fuel injector
US9771911B2 (en) 2013-08-23 2017-09-26 Denso Corporation Fuel injection valve
WO2019052718A1 (en) * 2017-09-13 2019-03-21 Robert Bosch Gmbh Fuel injector

Also Published As

Publication number Publication date
EP2080893B1 (en) 2010-11-17
DE602008003515D1 (en) 2010-12-30

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