CN1286742A - Hydraulic pump - Google Patents

Hydraulic pump Download PDF

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Publication number
CN1286742A
CN1286742A CN99801205A CN99801205A CN1286742A CN 1286742 A CN1286742 A CN 1286742A CN 99801205 A CN99801205 A CN 99801205A CN 99801205 A CN99801205 A CN 99801205A CN 1286742 A CN1286742 A CN 1286742A
Authority
CN
China
Prior art keywords
sliding shoes
holder
hydraulic pump
spare
cylinder
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
CN99801205A
Other languages
Chinese (zh)
Other versions
CN1136388C (en
Inventor
柳永善
朴钟铁
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.)
Samjoo Machinery Co Ltd
Original Assignee
Samjoo Machinery Co Ltd
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 Samjoo Machinery Co Ltd filed Critical Samjoo Machinery Co Ltd
Publication of CN1286742A publication Critical patent/CN1286742A/en
Application granted granted Critical
Publication of CN1136388C publication Critical patent/CN1136388C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F04B1/126—Piston shoe retaining means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2078—Swash plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/128—Driving means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2035—Cylinder barrels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2064—Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

A hydraulic pump includes a case having a plurality of fluid paths and a cylindrical shaped groove with a shaft-bearing hole. A shaft is inserted into the shaft-bearing hole of the groove such that it can be rotated. A plurality of cylinder members are disposed in the groove of the case each with a cylinder hole such that they can be rotated upon receipt of a rotational power of the shaft. A piston member is positioned in each of the cylinder members and reciprocates within the cylinder hole. A wobble plate member having an inclined side is combined with the case such that it covers an opening portion of the groove. Each of the cylinder members has a bottom side in a direction of the opening portion of the groove. A shoe having a waist is fixed to the piston member via a connecting member and contacts the inclined side of the wobble plate member. The cylinder member is provided with a barrel shaped portion at its bottom side. An elastic shoe holder is inserted onto the stepped portion of the shoe.

Description

Oil hydraulic pump
The present invention relates to a kind of oil hydraulic pump, relate to a kind of oil hydraulic pump that can only carry out the function of holding one sliding shoes in a suitable mode or rather with a part.
Usually, when an oil hydraulic pump was used as high pressure suction purpose, it is equipped with one usually had the swash plate spare and on an inclined-plane that the piston of one sliding shoes is arranged.In such structure,, adopt a suitable holding structure to realize this purpose usually because the sliding shoes of piston piece needs closely to contact with the inclined-plane of swash plate spare suitably to produce the high pressure vacuuming operation of whole device.
Fig. 4 is the sectional view of expression one based on the oil hydraulic pump of swash plate.This oil hydraulic pump comprises a housing 58, and it has the cylindrical groove 56 that a plurality of fluid passages 52 and 54 and have a bearing hole 57, and one is inserted in the axle bearing hole 57 of groove 56 so that revolvable axle 50.Be provided with a plurality of cylinder spares 60 in the groove 56 of housing 58, a cylinder-bore 62 is all arranged on each cylinder spare, cylinder spare can rotate when receiving axle 50 rotatory force with box lunch.In addition, each cylinder spare 60 all has one by hole 76, is used to make liquid to flow between cylinder-bore 62 and each fluid passage 52 and 540.The piston 64 that can move back and forth in cylinder-bore 62 is housed in each cylinder spare 60.One swash plate spare 68 combines with housing 58 so that cover the open part of groove 56, and swash plate spare 68 has an extension 56, and it forms the top side 66 of inclination at a certain angle.
Piston piece 64 comprises a sliding shoes 72 that pistons reciprocating 70 and is fixed in piston 70 and moves along the inclined-plane 66 of swash plate spare 68 with the rotation of cylinder spare 60 by link 74 in casing bore 62.Link 74 is formed with a ball-and-socket joint so that sliding shoes 72 can be freely moved along the inclined-plane of swash plate 68.
One sliding shoes holder 78 is sleeved on the sliding shoes 72 so that sliding shoes 72 abuts against on the swash plate 68.The a pair of axle collar 80 is arranged in the cylinder spare 60 with intended distance, and between an elastic component 82 tensionings two axle collars 80.One drum 86 is inserted between axle 50 and the sliding shoes holder 78, leans against on the sliding shoes 72 to support sliding shoes holder 78.One pin member 84 is inserted between the drum 86 and the adjacent axle collar 80.
In the oil hydraulic pump of mentioning in front, when receiving the elastic force of elastic component 82, pin member 84 is passed to drum 86 with elastic force, and drum 86 is pressed onto sliding shoes holder 78 on the inclined-plane 66 of swash plate spare 66 again.
The result is, the sliding shoes 72 of piston piece 64 abuts against on the inclined-plane 66 of swash plate spare 68, and 66 moves along the inclined-plane with the rotation of cylinder spare 60.At this moment, the piston 70 of piston piece 64 to-and-fro motion in the casing bore 62 of cylinder spare 60.In this operation, when the sliding shoes 72 of piston piece 64 moved downward on inclined-plane 66, a liquid entered casing bore 62 via through hole 76 by liquid input channel 52.Opposite, when sliding shoes 72 moved upward on inclined-plane 66, the liquid that enters into casing bore 62 was discharged by liquid discharge passage 54 via through hole 76.By this way, the hydraulic pressure of expection obtains in oil hydraulic pump.
, in the sliding shoes supporting mechanism of mentioning in front, a plurality of sliding shoes holding members, comprise axle collar spare 80, elastic component 82, pin member 84, drum 86 and sliding shoes holder 78, make complex structure, prolonged the production time and operating cost is increased, bring bad manufacturing efficiency.Because can infer, some sliding shoes holding members in such sliding shoes supporting mechanism not necessarily.
The purpose of this invention is to provide a kind of oil hydraulic pump that can only carry out holding sliding shoes function effectively with a part.
This and other purpose can realize by an oil hydraulic pump that has an elasticity sliding shoes holder.Oil hydraulic pump comprises a housing, and this housing has the cylindrical groove that a plurality of fluid passages and have a bearing hole.Waving it in the axle bearing hole that is inserted into groove can rotate.The a plurality of cylinder spares that respectively have a casing bore are installed in the groove of housing, so that cylinder spare can rotate when receiving the rotatory force of axle.One piston piece is installed in each cylinder spare, and along with rotation to-and-fro motion in casing bore of cylinder spare.One has the swash plate spare on an inclined-plane to combine with housing so that it covers the open part of groove.One bottom surface is arranged on the direction of the open part of each cylinder spare groove.One has the sliding shoes of a waist to be connected with piston by a connection piece, and contacts with the inclined-plane of swash plate spare.
Cylinder spare is provided with a barrel-shaped part in its bottom side, and sliding shoes has a step part at its waist.One elasticity sliding shoes holder is inserted on the step part of sliding shoes.A plurality of elastomers that the holder of elasticity sliding shoes has a round center hole and is bonded to each other and is integral and bends inwards around center hole.The insertion of elasticity sliding shoes holder is carried out by round center hole.When the holder of elasticity sliding shoes was inserted on the step part of sliding shoes, each elastomer contacted with barrel-shaped part.Elastomeric kink respectively is formed with a curved shape to realize a good elasticity.
Below in conjunction with drawings and Examples the present invention is described in further detail, wherein
Fig. 1 is the sectional view according to the oil hydraulic pump that has an elasticity sliding shoes holder of first preferred embodiment of the invention.
Fig. 2 A is the perspective view of the sliding shoes of elasticity shown in Fig. 1 holder.
Fig. 2 B is the front elevation of the sliding shoes of elasticity shown in Fig. 1 holder.
Fig. 2 C is the planimetric map of the sliding shoes of elasticity shown in Fig. 1 holder.
Fig. 3 A is the perspective view that is used for according to the elasticity sliding shoes holder of the oil hydraulic pump of second preferred embodiment of the invention.
Fig. 3 B is the planimetric map of the holder of elasticity sliding shoes shown in Fig. 3 A.
Fig. 3 C is the front elevation of the holder of elasticity sliding shoes shown in Fig. 3 A.
Fig. 4 is the sectional view of existing oil hydraulic pump.
Below in conjunction with description of drawings the preferred embodiments of the present invention.
Fig. 1 is a sectional view, and the oil hydraulic pump that has an elasticity sliding shoes holder of first preferred embodiment of the invention is described, Fig. 2 A is the view of explanation elasticity sliding shoes holder to 2C.
As shown in Figure 1, this oil hydraulic pump comprises a housing 12, and it has the cylindrical groove 6 that a plurality of fluid passages 8,10 and have a bearing hole 4, and one is inserted in the axle bearing hole 4 of groove 6 so that revolvable axle 2.Be provided with a plurality of cylinder spares 14 in the groove 6 of housing 12, a cylinder-bore 16 is all arranged on each cylinder spare, cylinder spare can rotate when receiving axle 2 rotatory force with box lunch.In addition, each cylinder spare 14 all has one by hole 18, is used to make liquid to flow between cylinder-bore 16 and each fluid passage 8 and 10.One barrel portion is stretched out from the bottom side of cylinder spare 14 with being integral.This barrel portion has a rounding side towards sliding shoes 24, hereinafter abbreviates bucket 20 as.The tubbiness parts identical functions of bucket 20 in order to be adopted in execution and the conventional hydraulic pumps is equipped with the piston 32 that can move back and forth in the cylinder-bore 16 of cylinder spare 14 in each cylinder spare 14.
One swash plate spare 26 combines with housing 12, and swash plate spare cover cap is lived the open part of groove 6.Swash plate spare 26 has the top on a formation one inclined-plane 28.
Piston piece 14 comprises that a piston that moves back and forth 32 and is connected on the piston 22 so that the sliding shoes 24 that can move along the inclined-plane 28 of swash plate spare 26 along with the rotation of cylinder spare 14 by a connection piece 30 in cylinder-bore 16.Link 30 be formed with a ball-and-socket joint with guarantee sliding shoes 24 along the inclined-plane 28 easy motion.
Sliding shoes 24 has the single order step-portion at its waist, hereinafter abbreviates stopper 34 as.The one elasticity sliding shoes holder 36 with predetermined elasticity is inserted on the stopper 34 of sliding shoes 24 and is placed on it.
Shown in Fig. 2 A-2C, elasticity sliding shoes holder 36 has center hole 38 and a plurality of elastomer 40 that is bonded to each other and also bends inwards around center hole 38 for one of a circle.In other words, each elastomer 40 is parallel bilateral structure at its kink 44 places towards center hole 38.In addition, each elastomer 40 all has a hole 42 at its two-sided part place.The free end shaping side of the elastomer 40 adjacent with hole 42 contacts with bucket 20 being in the state of reclining, and the stopper 34 of the opposite side of elastomer 40 and sliding shoes 24 reclines.
Owing to act on the elasticity of elasticity sliding shoes holder 36 between bucket 20 and the sliding shoes 24, make sliding shoes 24 can closely contact the inclined-plane 28 of swash plate spare 26 and 28 move along the inclined-plane with stable manner along with the rotation of cylinder spare 14.
The kink 44 of elastomer 40 forms curved shape to produce effective elastic force.
In the course of the work, when axle 2 when cylinder spare 14 transmits rotatory forces, the sliding shoes 24 that is connected in piston 22 by link 30 moves along the inclined-plane 28 of swash plate spare 26, thereby makes piston 22 to-and-fro motion in the casing bore 16 of revolving cylinder spare 14.When sliding shoes 24 moved downward on inclined-plane 28, a liquid just flowed into casing bores 16 by feed pathway 8 via passing through hole 18.On the contrary, when sliding shoes 24 moved upward on inclined-plane 28, the liquid of introducing casing bore 16 was just via discharging by liquid outlet channel 10 by hole 18.
Fig. 3 A-3C is the view that expression is used for the elasticity sliding shoes holder of second preferred embodiment of the invention oil hydraulic pump.In this preferred embodiment, except that the holder of elasticity sliding shoes, other constituent elements of oil hydraulic pump is all identical with first preferred embodiment.
Shown in Fig. 3 A and 3B, elasticity sliding shoes holder 49 has a round center hole 45, around the land portions 46 of center hole 45 centerings and a plurality of plates 48 that deviate from land portions 46 extensions.Land portions 46 has predetermined curvature, makes it contact with the bucket 20 of cylinder spare 14.In this structure, because land portions 46 upper and lower diameters are different naturally, the elasticity that elasticity sliding shoes holder 49 can obtain to expect.
As mentioned above, oil hydraulic pump of the present invention can only be carried out the function of holding sliding shoes by rights with a part of elasticity sliding shoes holder, consequently reduced manufacturing time and manufacturing expense, and made working efficiency higher.
Though in conjunction with the preferred embodiments the present invention has been done detailed explanation, the Professional visitors will be understood that various changes and replaces this aspect spirit and scope can make and not deviate from claims and limited.

Claims (5)

1. an oil hydraulic pump comprises a housing, and housing has a plurality of fluid passages and a cylindrical groove that has a bearing hole; One inserts the axle bearing hole of described groove so that the axle that is rotated; In a plurality of described grooves that are arranged on housing, respectively carry the cylinder spare of a casing bore, so that each cylinder spare can rotate when receiving the rotatory force of axle; One be arranged in each cylinder spare, with pistons reciprocating in the casing bore of cylinder spare; One has the swash plate spare on an inclined-plane, swash plate spare combines with described housing and makes swash plate spare cover the opening portion of described groove, each cylinder spare has a bottom side of direction that is positioned at the opening portion of described groove, and one be connected in piston and contact the sliding shoes on the inclined-plane of swash plate spare by a connection piece, sliding shoes has a waist, and described oil hydraulic pump comprises:
One barrel portion of stretching out from cylinder spare bottom side with being integral;
One is formed on the step part of sliding shoes waist; And
One is inserted into the elasticity sliding shoes holder on the step part of sliding shoes, and this elasticity sliding shoes holder has the sidepiece of a contact barrel portion.
2. oil hydraulic pump according to claim 1, wherein, the holder of elasticity sliding shoes comprises a round center hole, with a plurality of elastomers that are bonded to each other and are integral and bend inwards around center hole, the holder of elasticity sliding shoes is inserted into by round center hole on the step part of sliding shoes, and the described sidepiece of the contact barrel portion of elasticity sliding shoes holder is corresponding to elastomer.
3. as oil hydraulic pump as described in the claim 2, wherein, each elastomeric each kink all has a curved shape.
4. oil hydraulic pump according to claim 1, wherein, the holder of elasticity sliding shoes comprises that a round center hole, is around the land portions of round center hole centering and a plurality of plates that deviate from the land portions extension, the holder of elasticity sliding shoes is inserted on the step part of sliding shoes by round center hole, and the described sidepiece of the contact barrel portion of elasticity sliding shoes holder is corresponding to land portions.
5. as oil hydraulic pump as described in the claim 4, wherein, land portions has a predetermined curvature, and upper and lower diameter does not wait each other.
CNB99801205XA 1999-01-21 1999-06-10 Hydraulic pump Expired - Fee Related CN1136388C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2019990000759U KR19990021863U (en) 1999-01-21 1999-01-21 Elastic shoe holder of oilhydraulic pump
KR1999/759U 1999-01-21

Publications (2)

Publication Number Publication Date
CN1286742A true CN1286742A (en) 2001-03-07
CN1136388C CN1136388C (en) 2004-01-28

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ID=19571222

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB99801205XA Expired - Fee Related CN1136388C (en) 1999-01-21 1999-06-10 Hydraulic pump

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JP (2) JP3375332B2 (en)
KR (2) KR19990021863U (en)
CN (1) CN1136388C (en)
AU (1) AU4170999A (en)
WO (1) WO2000043672A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104234960A (en) * 2013-06-05 2014-12-24 罗伯特·博世有限公司 Hydrostatic Axial Piston Machine and Retention Plate
CN104662292A (en) * 2013-05-07 2015-05-27 川崎重工业株式会社 Hydraulic rotary device
CN108799096A (en) * 2018-06-13 2018-11-13 兰州理工大学 A kind of surface anti-drag type hydraulic planger pump/motor cylinder

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4526640B2 (en) * 2000-03-10 2010-08-18 ヤンマー株式会社 Axial piston pump / motor
JP2001304099A (en) * 2000-04-25 2001-10-31 Yanmar Diesel Engine Co Ltd Axial piston pump motor
KR100433392B1 (en) * 2002-02-18 2004-05-31 한국기계연구원 Swash plate type axial piston apparatus
KR100734552B1 (en) * 2006-03-13 2007-07-02 전북대학교산학협력단 Oil hydraulic piston pump and retainer for oil hydraulic piston pump
US8511390B2 (en) 2009-12-23 2013-08-20 Bp Corporation North America Inc. Rigless low volume pump system
CA2888027A1 (en) 2014-04-16 2015-10-16 Bp Corporation North America, Inc. Reciprocating pumps for downhole deliquification systems and fluid distribution systems for actuating reciprocating pumps

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382814A (en) * 1966-05-23 1968-05-14 Sundstrand Corp Piston holddown means
CH482912A (en) * 1967-11-15 1969-12-15 Hueller Gmbh K Axial piston machine
US3996841A (en) * 1971-02-23 1976-12-14 Sundstrand Corporation Hydraulic pump or motor
DE3911129A1 (en) * 1989-04-06 1990-10-11 Kirovogr Z Gidravliceskich Sil Hydraulic axial piston machine
US5862704A (en) * 1996-11-27 1999-01-26 Caterpillar Inc. Retainer mechanism for an axial piston machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104662292A (en) * 2013-05-07 2015-05-27 川崎重工业株式会社 Hydraulic rotary device
CN104234960A (en) * 2013-06-05 2014-12-24 罗伯特·博世有限公司 Hydrostatic Axial Piston Machine and Retention Plate
CN104234960B (en) * 2013-06-05 2018-03-30 罗伯特·博世有限公司 Hydrostatic axial piston engine and support plate
CN108799096A (en) * 2018-06-13 2018-11-13 兰州理工大学 A kind of surface anti-drag type hydraulic planger pump/motor cylinder

Also Published As

Publication number Publication date
JP3375332B2 (en) 2003-02-10
WO2000043672A1 (en) 2000-07-27
CN1136388C (en) 2004-01-28
JP2003155973A (en) 2003-05-30
KR200169204Y1 (en) 2000-02-15
JP2002535552A (en) 2002-10-22
KR19990021863U (en) 1999-06-25
AU4170999A (en) 2000-08-07

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