CN101080574A - Delivery unit - Google Patents

Delivery unit Download PDF

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Publication number
CN101080574A
CN101080574A CNA2005800429374A CN200580042937A CN101080574A CN 101080574 A CN101080574 A CN 101080574A CN A2005800429374 A CNA2005800429374 A CN A2005800429374A CN 200580042937 A CN200580042937 A CN 200580042937A CN 101080574 A CN101080574 A CN 101080574A
Authority
CN
China
Prior art keywords
impeller
pump chamber
conveying unit
depression
depressions
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.)
Pending
Application number
CNA2005800429374A
Other languages
Chinese (zh)
Inventor
F·伊蒂瑞姆
U·米勒
B·罗
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN101080574A publication Critical patent/CN101080574A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/188—Rotors specially for regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

In prior art, delivery units comprise a running wheel which is arranged in a pump chamber and which can be driven in a rotated manner by means of an actuator and comprise two front sides whereby a front wall of the pump chamber is arranged opposite thereto, and also comprises several recesses for storing, in a hydrodynamic manner, in both front sides of the running wheel. One disadvantage of the delivery unit is that dirt particles can collect in the recesses. When the dirt particles are flushed out from the recesses, they produce, in the region between the recesses which are arranged in a circular manner, increased friction and also stress marks and the axial gap between the running wheel and the pump chamber is smaller than in the region of the recesses. The inventive delivery unit reduces the friction acting upon the running wheel and increases efficiency. According to the invention, at least two adjacent recesses (38) of the at least one front side (28,29) and/or the at least one front wall (15,16) are connected together by, respectively at least one groove (42).

Description

Carry unit
Prior art
The present invention relates to a kind of conveying unit as type as described in the main claim.
By the known a kind of conveying unit of EP 1 091 127 A1, it has an impeller that is arranged in the pump chamber, this impeller can be driven in rotation and has two end faces by an actuator, they are respectively mutually opposed with an end wall of pump chamber, and this conveying unit also has a plurality of depressions that are used for dynamic pressure support in two end faces of impeller.Defective is may build up dirt particle in depression.When dirt particle by from depression when being gone out, the friction that their region generating between the depression of annular setting increase also produces the scouring vestige thus, because the axial clearance between impeller and the pump chamber is less than the axial clearance at sunk area there.
The invention advantage
Be that improve with the following realization of simple mode: at least two adjacent depressions of at least one end face and/or at least one end wall respectively interconnect by at least one groove according to the advantage with conveying unit of the described feature of main claim characteristic of the present invention.Increase the axial clearance in the zone between the depression in this way, dirt particle can not cause the friction and the scouring vestige of increase there thus.
Can be implemented in the favourable expansion structure and the improvement of the conveying unit that provides in the main claim by measure described in the dependent claims.
According to an advantageous embodiment, these depressions and groove be layout and circular arc, part annular, long hole shape or the extension of analogous shape ground circlewise.At this, depression and groove advantageously are arranged on the public ring.
In addition advantageously, depression has the bigger degree of depth than groove, because can constitute the plane of inclination in this way, they realize the hydrodynamic pressure supporting of impeller.
Particularly advantageously be, these depressions respectively have at least one face with respect to the hydrodynamic pressure supporting that is used for impeller of end face and/or end wall inclination, because regulate the axial position of impeller in this way like this, make the approximate at least identical size of two axial clearances between impeller and the pump chamber end wall.Reduce to act on the friction on the impeller thus and improve the efficient of carrying unit.Described at least one plane of inclination of each depression is separately positioned on the depression end that lags behind about the impeller sense of rotation when concave arrangement is on impeller and is separately positioned on when layout is recessed on the pump chamber end wall on the depression end in downstream.
Also advantageously, these depressions respectively have a position the darkest, and it is parallel at least one end face and/or end wall extends.
In addition advantageously, the depression of an end face of impeller is mutually opposed symmetrically about the central plane mirror image with the depression of the other end of impeller, and wherein, the opposed symmetrically depression of mirror image interconnects by a pressure equalisation passage.Reach in this way, the pressure in two depressions that are connected by pressure equalisation passage always is balanced.
Accompanying drawing
Simplify in the accompanying drawings embodiments of the invention and explanation in detail in the following description are shown.Accompanying drawing illustrates:
Fig. 1 the present invention carries the section of the partial view of unit,
Fig. 2 should carry an impeller of unit,
Fig. 3 is along the impeller sectional view of Fig. 2 center line III-III,
Fig. 4 is along the conveying unit sectional view of Fig. 1 center line IV-IV,
Fig. 5 is along the conveying unit sectional view according to second embodiment of Fig. 1 center line V-V,
Fig. 6 has impeller and the depression that is arranged in the pump chamber end wall according to second embodiment's a sectional view.
Embodiment
Fig. 1 illustrates one according to conveying unit of the present invention.
The present invention carries unit to be used for carrying liquid, for example fuel from storage container, for example flows to internal-combustion engine by pressure piping.
Conveyor set constructor of the present invention is fluid pump, peripheral pump or be with side canal pump and have pump case 1 for example, and it has a pump part 2 and a motor part 3.
Pump part 2 has pump chamber 4, and in this pump chamber, impeller 5 turns round rotatably around rotational symmetric pump shaft line 8.Impeller 5 is driven by live axle 10 by the actuator 9 that is arranged in the motor part 3.Actuator 9 for example is a motor and is placed in the motor chamber 7 of motor part 3.
The zone of pump chamber 4 upstreams is called the suction side, and the zone in pump chamber 4 downstreams is called unit on the pressure side.
Pump chamber 4 has 11 and pump chamber outlets 12 of a pump chamber inlet.Pump chamber 4 is by two opposed end walls on pump shaft line 8 directions, i.e. first end wall 15 and second end wall, 16 limited boundaries and serve as that reference is by annular wall 7 limited boundaries with pump shaft line 8 diametrically, wherein, pump chamber inlet 11 is arranged in first end wall 15, and pump chamber outlet 12 is arranged in second end wall 16.
Impeller 5 has a plurality of impeller blades 5.1, respectively constitutes a vane room 5.2 between them.Vane room 5.2 is opened wide and serve as with reference to sealing by a ring 5.3 towards radially outer with pump shaft line 8 for example towards end wall 15,16, and this ring is arranged in the radial outer end portion of impeller blade 5.1.But vane room 5.2 obviously also can be opened wide and not encircle 5.3 to radially outer.
Settle the transfer passage 14 of annular in end wall 15,16, they are placed in the radial zone of impeller blade 5.1.
First end wall 15 for example is the part of suction cover 18, and second end wall 16 and annular wall 17 for example are the parts of pressure cover 19.An inlet channel 22 is set in suction cover 18, and it leads in the pump chamber 4 by pump chamber inlet 11, and wherein, the liquid of carrying unit to carry leaves pump chamber 4 by pump chamber outlet 12.For example pump chamber 4 by pump chamber outlet 12 be arranged on pressure cover 19 in outlet passage 23 and 7 through-flow connections of motor chamber.
Pressure cover 19 has a through hole 24.This through hole 24 that passes pressure cover 19 from motor chamber 7 with the live axle 10 of actuator 9 mechanical coupling stretches into pump chamber 4.
Therefore the axial width of pump chamber 4 respectively exists an about axial clearance 20 of 10 to 30 microns greater than the axial width of impeller 5 between impeller 5 and end wall 15,16.Difference between the width of the width of pump chamber 4 and impeller 5 is defined as line shaft to the gap.
Impeller 5 for example is inserted on the live axle 10 that stretches in the pump chamber 4, and impeller 5 has impeller bore 25 for this reason, and live axle 10 puts in this hole at least, so that and/or force closure sealed with impeller shape ground is connected.Impeller 5 for example is bearing on the live axle 10 like this, makes impeller can move axially between first end wall 15 and second end wall 16.
Impeller 5 has in the face of first end face 28 of pump chamber 4 first end walls 15 with in the face of second end face 29 of pump chamber 4 second end walls 16.
A plurality of depressions 38 that are used for the hydrodynamic pressures supporting of impeller 5 are set at least one end wall 15,16 of at least one end face 28,29 of impeller 5 and/or pump chamber 4.Depression 38 for example is arranged on the end face 28,29 of impeller 5 in Fig. 1.But they also can be arranged on the end wall 15,16 of pump chamber 4 according to second embodiment.These depressions 38 constitute like this, make them as the hydrodynamic pressure bearing, work and regulate impeller 5 in this way like this at first end wall 15 of pump chamber 4 and the axial position between second end wall 16, make the axial clearance 20 that between impeller 5 and end wall 15,16, obtains two identical sizes.Have only little frictional force action thus on impeller 5, make and improved the efficient of carrying unit.
Liquid also for example flows to internal-combustion engine 34 with this liquid such as fuel by pressure piping 33 to carry unit for example to aspirate by the motor chamber 7 of the motor part of inlet channel 22, pump chamber inlet 11, pump chamber 4, pump chamber outlet 12, outlet passage 23, pump case 1 from storage container 32.A safety check 35 for example is set, so that the predetermined pressure in the pipeline 33 that after carrying unit to close, keep-ups pressure in pressure piping 33.
Fig. 2 illustrates a pressure impeller carrying unit, has the depression of carrying first embodiment of unit according to the present invention.
In impeller, keep identical or act on identical part representing with comparing with identical mark according to the conveying unit of Fig. 1 according to Fig. 2.
Depression 38 for example is arranged on impeller blade 5.1 inside of impeller 5 diametrically and arranges to such an extent that be positioned on the imaginary annulus.This annulus is for example concentric with pump shaft line 8.For example four depressions 38 are evenly distributed on the circumference of this ring.But many arbitrarily depressions 38 can be set obviously.These depressions 38 for example circular arc, part annular, long hole shape or analogous shape ground are extended.These depressions 38 respectively have the hydrodynamic pressure supporting that at least one face 39 that tilts with respect to end face 28,29 is used for impeller 5.The face 39 that is used for the inclination of hydrodynamic pressure supporting is placed in the end with respect to 41 hysteresis of impeller 5 sense of rotation of depression 38.Depression 38 respectively has a darkest position 40, and it for example is parallel to end face 28,29 and extends.For example cave in 38 position, deep 40 in abutting connection with the face 39 of two inclinations, the i.e. face of a leading face and a hysteresis.According to first embodiment, leading plane of inclination 39 has short length than the plane of inclination 39 that lags behind on sense of rotation, for example short arc length.Can save plane of inclination leading on sense of rotation 39 yet and also replace by the convex shoulder of stepped shape, supporting is not contributed because this regards to hydrodynamic pressure.
According to the present invention, at least two adjacent recessed 38 of described at least one end face 28,29 and/or described at least one end wall 15,16 respectively interconnect by at least one groove 42.According to first enforcement, two end faces 28,29 of routine impeller 5 are provided with depression 38.For example each depression 38 each be connected by a groove 42 with adjacent depression 38.This groove 42 for example circular arc, annular or analogous shape ground extends, and makes depression 38 and groove 42 form a public ring jointly.But cave in 38 and groove 42 at least can be by groove 42 the degree of depth keep difference less than the position, deep 40 of depression 38 and the degree of depth (Fig. 3) of plane of inclination 39.The width B n of the diametrically opposed groove of measuring in the pump shaft line 8 42 for example width B v with the diametrically opposed depression of measuring in pump shaft line 8 38 is the same big, but also can be different.
Depression 38 plane of inclination 39 forms thus: 38 the degree of depth of caving in for example reduces towards adjacent groove 42 continuously from position, deep 40 respectively.
Fig. 3 illustrates along the impeller sectional view of Fig. 2 center line III-III.
Depression 38 is for example approximate at least in the zone of position, deep 40 to be parallel to end face 28,29 ground and to extend.Then, see that their are extending and lead in this groove to groove 42 directions that lag behind under the situation that the degree of depth reduces through the plane of inclination 39 that lags behind on sense of rotation 41 against sense of rotation 41.On sense of rotation, see depression 38 the degree of depth or the stepped shape convex shoulder 43 that illustrates by a dotted line or reduce and lead in the leading groove 42 by leading plane of inclination 39.
The depression 38 of an end face 28 of impeller 5 is for example mutually opposed with the depression 38 of the other end 29 of impeller 5 symmetrically about central plane 45 mirror images, and wherein, the opposed symmetrically depression 38 of mirror image interconnects by a pressure equalisation passage 46.In two depressions 38 that connect by pressure equalisation passage 46, form identical high pressure in this way.Pressure equalisation passage 46 is for example led in the depression 38 in the zone of position, deep 40 respectively.
The liquid that is arranged in axial clearance 20 is carried to sense of rotation 41 when impeller 5 rotations and is had the relative velocity that points to against sense of rotation 41 with respect to impeller 5.Therefore cave in 38 and groove 42 flow through against sense of rotation 41 by the liquid in the axial clearance 20.In the zone of the plane of inclination 39 that lags behind, the end face 28 of impeller 5,29 with the end wall 15 of pump chamber 4, through flow cross section wedge shape ground between 16 narrows down, make and in liquid, set up the high pressure that increases gradually, this pressure acts on the corresponding end face 28,29 of impeller 5 and regulates the axial position of impeller 5 in this way like this, makes the axial clearance 20 that produces identical size.
Fig. 4 illustrates according to second embodiment's the conveying unit sectional view along Fig. 1 center line IV-IV, and Fig. 5 illustrates along the sectional view of Fig. 1 center line V-V.
In conveying unit, and keep identical or act on identical part according to the conveying unit of Fig. 1 to 3 representing with identical mark according to Figure 4 and 5.
Be that with difference depression 38 is not to be placed on two end faces 28,29 of impeller 5, but is placed on two end walls 15,16 of pump chamber 4 according to second embodiment of Fig. 4 according to the embodiment of Fig. 1 to 3.Removed pressure equalisation passage 46.Depression 38 on the end wall 15,16 that is arranged in pump chamber 4 time with the sense of rotation that is arranged in the impeller 5 that do not coexist on the impeller 5 on by the flow of liquid mistake.What therefore, the plane of inclination 39 that is used for hydrodynamic pressure supporting was arranged in depression 38 is in the end in downstream with respect to axial clearance 20 flow directions.
Depression 38 serves as with reference to being placed in transfer passage 14 inner radial with pump shaft line 8 in a second embodiment.Depression 38 for example approximate end wall 15,16 that is parallel in 40 zones, position, deep extends.They extend to the groove 42 in downstream always and feed this groove through the plane of inclination 39 that is used for the hydrodynamic pressure supporting that is in the back with respect to the flow direction in the axial clearance 20 under the situation that the degree of depth reduces in the downstream.Adverse current 38 the degree of depth or the convex shoulder 42 by a stepped shape or the person plane of inclination 39 by a upstream of upwards caving in reduces and leads to see on flow direction in the preposition groove 42.
The depression 38 of an end wall 15 of pump chamber 4 is for example mutually opposed with the depression 38 of another end wall 16 of pump chamber 4 symmetrically about being positioned at the center between the end wall 15,16 and being parallel to median plane mirror image that these end walls extend.
Fig. 6 illustrates a sectional view according to second embodiment, has impeller and is arranged in depression in the end wall of pump chamber.
In conveying unit, and keep identical or act on identical part according to the conveying unit of Fig. 1 to 5 representing with identical mark according to Fig. 6.

Claims (10)

1. the conveying unit has an impeller that is placed in the pump chamber, and this impeller can be driven in rotation and has two end faces by actuator, and each is mutually opposed with an end wall of pump chamber for these end faces; In wherein at least one end wall of wherein at least one end face of impeller and/or pump chamber, have a plurality of depressions that are used for the hydrodynamic pressure supporting, it is characterized in that, described at least one end face (28,29) and/or at least two adjacent depressions (38) of described at least one end wall (15,16) respectively interconnect by a groove (42).
2. conveying unit as claimed in claim 1 is characterized in that, these depressions (38) and/or groove (42) are arranged circlewise.
3. conveying unit as claimed in claim 1 is characterized in that, these depressions (38) and/or groove (42) circular arc, part annular, long hole shape or analogous shape ground extend.
4. conveying unit as claimed in claim 1 is characterized in that, these depressions (38) and groove (42) form a public ring.
5. conveying unit as claimed in claim 1 is characterized in that, these depressions (38) have the bigger degree of depth than groove (42).
6. conveying unit as claimed in claim 1 is characterized in that, these depressions (38) respectively have at least one face (39) with respect to end face (28,29) and/or end wall (15,16) hydrodynamic pressure supporting that tilt, that be used for impeller (5).
7. conveying unit as claimed in claim 5 is characterized in that, described at least one plane of inclination (39) is separately positioned on when impeller (5) is gone up on the end that lags behind with respect to impeller (5) sense of rotation (41) of depression (38) in these concave arrangement.
8. conveying unit as claimed in claim 5 is characterized in that, described at least one plane of inclination (39) is separately positioned on the downstream end of depression (38) when pump chamber (4) end wall (15,16) is gone up in these concave arrangement.
9. conveying unit as claimed in claim 6 is characterized in that, these depressions (38) respectively have position, deep (40), and it is parallel at least one end face (28,29) and/or end wall (15,16) extends.
10. conveying unit as claimed in claim 1, it is characterized in that, the depression (38) of an end face (28) of impeller (5) is mutually opposed with the depression (38) of another end face (16) of impeller (5) symmetrically about central plane (45) mirror image, wherein, the opposed symmetrically depression of mirror image (38) interconnects by a pressure equalisation passage (46).
CNA2005800429374A 2004-12-17 2005-10-17 Delivery unit Pending CN101080574A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004060904A DE102004060904A1 (en) 2004-12-17 2004-12-17 delivery unit
DE102004060904.7 2004-12-17

Publications (1)

Publication Number Publication Date
CN101080574A true CN101080574A (en) 2007-11-28

Family

ID=35520982

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2005800429374A Pending CN101080574A (en) 2004-12-17 2005-10-17 Delivery unit

Country Status (7)

Country Link
US (1) US20090238680A1 (en)
EP (1) EP1828613A1 (en)
JP (1) JP2008523317A (en)
KR (1) KR20070086257A (en)
CN (1) CN101080574A (en)
DE (1) DE102004060904A1 (en)
WO (1) WO2006063887A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015098293A1 (en) * 2013-12-27 2015-07-02 日立オートモティブシステムズ株式会社 Water pump and method for producing water pump

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1141556A (en) * 1908-08-17 1915-06-01 Ferdinand W Krogh Centrifugal pump.
US2658455A (en) * 1948-02-26 1953-11-10 Laval Steam Turbine Co Impeller with center intake
JPS4921705A (en) * 1972-06-21 1974-02-26
US4854830A (en) * 1987-05-01 1989-08-08 Aisan Kogyo Kabushiki Kaisha Motor-driven fuel pump
US4872806A (en) * 1987-05-15 1989-10-10 Aisan Kogyo Kabushiki Kaisha Centrifugal pump of vortex-flow type
DE4438249A1 (en) * 1994-10-26 1996-05-02 Bosch Gmbh Robert Fuel supply unit for supplying fuel from tank to IC engine
DE19903397B4 (en) * 1999-01-29 2005-02-03 Siemens Ag Wheel
JP3800128B2 (en) * 2001-07-31 2006-07-26 株式会社デンソー Impeller and turbine fuel pump

Also Published As

Publication number Publication date
WO2006063887A1 (en) 2006-06-22
US20090238680A1 (en) 2009-09-24
JP2008523317A (en) 2008-07-03
EP1828613A1 (en) 2007-09-05
DE102004060904A1 (en) 2006-06-29
KR20070086257A (en) 2007-08-27

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