EP1462654B1 - Zahnradpumpe - Google Patents
Zahnradpumpe Download PDFInfo
- Publication number
- EP1462654B1 EP1462654B1 EP04450056A EP04450056A EP1462654B1 EP 1462654 B1 EP1462654 B1 EP 1462654B1 EP 04450056 A EP04450056 A EP 04450056A EP 04450056 A EP04450056 A EP 04450056A EP 1462654 B1 EP1462654 B1 EP 1462654B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear
- pressure
- pump
- gear pump
- shiftable
- 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.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006266 hibernation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0023—Axial sealings for working fluid
- F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
Definitions
- the invention relates to a gear pump with variable delivery volume two externally toothed gears meshing with each other which mesh are rotatably mounted in a pumping chamber of a pump housing, wherein at least one of the two gears is drivable via a drive shaft and one of the two gears, preferably the aborted gear, in the direction the axis of this gear is designed to be displaceable.
- Gear pumps with two intermeshing externally toothed Gears have a gear driven by a drive shaft on which drives the second gear.
- the gear engagement width is decisive for the volume flow of the Pumped fluid through the gear pump decisive. Losses by the head play of the gears to the pump housing and by the play of the Spaltshuses arise at the ends of the gears are in efficiency the gear pump reflected.
- Gear pumps of this type are usually used for oil pumps of internal combustion engines.
- conventional Oil pumps are powered by a rigid, non-variable drive such as chain, gears, Timing belt, etc. in a fixed speed ratio with the crankshaft of the Motors coupled.
- Oil pumps are generally used in the worst case of oil supply the internal combustion engine over the entire speed field designed, the is the idle speed with the largest gap cross section in the bearing points, inclusive all other consumers on the engine such as pistons, spray nozzle for piston cooling or turbocharger, etc. From this interpretation it follows that the oil pump at higher speeds of the internal combustion engine over a multiple of the need Promotes oil quantity for high engine speeds.
- the quantity regulation to the actual Consumption of the respective engine operating state is usually carried out by pressure control and Ab juryn the excess amount of oil delivered in the oil sump, or by returning it to the suction channel of the pump. Because the Gears of the pump thus always promote the maximum amount of oil must be independent from the actual need always approximately the same high drive power to be provided. This has a disadvantageous effect on the efficiency.
- a gear pump with adjustable displacement is a gear pump with adjustable displacement known.
- a gear of the gear pump has openings, which extending from a coaxial bore to the tooth spaces.
- a rotary valve with at least one web which is a partially cylindrical Has lateral surface and defines an axial recess on the rotary valve, rotatably mounted on a gear carrying a shaft.
- the jetty is with its lateral surface in the inside of the bore and the recess is connected to the low pressure side of the pump.
- the delivery volume by changing the meshing width to adjust.
- at least one of the two gears in shifted axially and thus the meshing width are changed, which are partly in the tooth gaps engaging patches necessary to To avoid dead spaces.
- Such gear pumps are for example from the GB 2 265 945 A, AT 003 767 U1, DE 41 21 074 A1 or the RU 2 177 085 C known.
- the gear pump Relatively much space through the axial gear adjustment to complete takes.
- US 2,434,135 A discloses a gear pump with an externally toothed Gear, which is in engagement with an internally toothed gear. By Moving the externally toothed gear and / or the internally toothed Gear, the delivery volume can be changed because the outlet side with the inlet side is shorted. On gear pumps with two externally toothed Gears, this concept is not readily transferable.
- the object of the invention is the simplest possible way in a gear pump of the type mentioned to achieve a regulation of the delivery volume.
- a through the in the axial direction measured distance between a substantially planar first inner side wall the delivery chamber of the pump housing and a first end face of the displaceable gear defined gap is variable and that a the first inner side wall opposite and parallel to this plane second inner side wall of the delivery chamber in the region of one of the first end face remote from the second end face of the sliding gear concentric Has formed to the axis, substantially cylindrical recess, whose Diameter at least in the region of the sliding gear larger than the Outer diameter of the gear is.
- the gap in a range between 0 to d / 5, preferably in a range between 0 to d / 50 is variable, wherein d is the outer diameter of the sliding gear.
- the regulation of the delivery volume is mainly by changing the gap size and thus the gap losses. filler for filling the dead spaces, which intervene, for example, in the tooth gaps, are not necessary.
- the pressure or flow control over the Change in the gap size satisfy extremely low axial displacements, because the gap greatly influences the pressure and flow rate of the gear pump.
- a preferably plate-shaped Sealing disc is arranged, which the conveying space of the pump housing separates from a dead space within the niche, preferably the Sealing disc rotatably connected to the sliding gear.
- the preferably plate-shaped sealing disc is a lateral seal allows for the dead space.
- the sealing disc facing on the second end face Side in the region of each interdental space of the sliding gear at least having a radial relief groove.
- the pressure and flow rate control takes place in the described gear pump completely without control piston or valves, whereby a very compact construction can be achieved.
- the gear pump in the control range also has a significant lower power consumption. Due to the extremely low displacement of Gears are almost always supporting the teeth all over the tooth flank, causing they are subject to much less wear than the tooth mesh width regulated gear pumps.
- the dead space via a discharge channel with a pressure sink preferably fluidly connectable to the suction side or the pump environment is, preferably in the discharge channel in the direction of Pressure sink opening pressure relief valve is arranged.
- the pressure relief valve has the task to prevent a pressure increase in the dead space. Thereby can avoid a malfunction of the control characteristics of the gear pump be, especially in cold run and in radially closed Sealing is important.
- the sealing disc has at least one circumferential sealing groove in its jacket region. Due to the circumferential sealing groove can be dispensed with radial relief grooves become.
- a simple shift of the gear can be achieved when the sliding Gear, preferably also the sealing disc, rigid on a in Pump housing rotatable and adjustable in the direction of the axis control shaft is arranged.
- the control shaft for axial adjustment at least one pressure piston which is connected to a pressure chamber which can be connected to a pressure medium borders, wherein preferably the pressure medium through the fluid is formed and the pressure chamber fluidly connected to the pressure side of the gear pump is.
- the Pressure chamber with an external pressure source or a pure oil control device, connected is. This allows external control.
- the default the control shaft can be trained on a trained example as a compression spring Return spring take place.
- the control shaft, at least in one direction, by an electric servomotor is adjustable.
- the gear pump 1 has two meshing, externally toothed Gears 2, 3, which in a delivery chamber 11 of a pump housing 4 are rotatably arranged.
- the gear 3 is via a drive shaft. 5 driven and drives the gear 2.
- the aborted gear 2 is together arranged with a sealing disc 6 on a control shaft 7 and can be moved with this in the direction of the axis 2 'of the gear 2, as with the arrow P is indicated.
- reference numeral 8 is the suction side, with reference numerals 9, the pressure side of the gear pump 1 and the arrows S, the flow direction of the medium.
- the gap 10 shown in FIG. 3 can be changed.
- the gap 10 is as a distance between a flat first inner side wall 11a of the delivery chamber 11 of the pump housing 4 and a first end face 2a of the displaceable Gear 2 defined.
- With the outer diameter d of the sliding Gear 2 is the adjustment range of the gap 10 between 0 to d / 5, preferably between 0 to d / 50, wherein the rest state shown in Fig. 2 a minimum, design-related value for the gap 10 assigned is.
- the regulation of the pressure or the flow rate is on the gap 10 and thus accomplished by changing the gap losses. This can be up Pockets, in particular for filling the interdental spaces 14, are dispensed with. Even a slight displacement of the displaceable gear 2 is sufficient to change the gap 10 sufficiently.
- the arranged in the niche 22 plate or annular sealing disc 6 is used to the the gear wheels 2, 3 receiving delivery chamber 11 of a for Displacement of the gear 2 necessary dead space 12 within the niche 22nd seal.
- This is via a in Figs. 2 and 3 and Fig. 4 and 5 dashed lines relief channel 25 connected to a pressure sink, which the suction chamber 8 or the pump environment, such as the oil space of an oil pan, may be.
- in the Relief channel 25 is a pressure relief valve opening in the direction of the pressure sink 26 arranged.
- the sealing disc 6 has tooth space symmetry arranged radial relief grooves 13 on the side of the first Front side 2a facing away from the second end face 2b of the movable gear. 2 on.
- Each radial relief groove 13 is in each case in the region of a tooth gap 14 of the sliding gear 2 is arranged and communicates during one revolution of the displaceable gear 2 with an outlet groove 15, which in the pressure-side engagement region 23 of the two gears 2, 3 in the Pump housing 4 is formed.
- radial relief grooves 13 can be largely dispensed with if the Sealing disc 6, as shown in Fig. 6, in its jacket region with at least a circumferential sealing groove 27 is provided which as a labyrinth seal acts and compensates for pressure peaks.
- the indicated by reference numeral 29 Leckagenut has the task in the Dead space 12 through the annular gap between the sealing disc 6 and pump housing 4 leak leaks to the outside.
- the leakage groove 29 is for example designed spirally and connects the dead space 12 with a spring chamber 30. In order to discharge leaks reliably in normal operation, is the sum of the cross-sectional areas of bearing clearance of the control shaft 7 and the leakage groove 29 at least as large as the annular gap between the sealing disc 6 and pump housing 4.
- the control shaft 7 has a pressure piston 17, which is the pump housing cover 4a is sealed off via the seal 18.
- the pressure piston 17 is adjacent to a pressure chamber 19, which closed by the screw 20 is.
- a Drucköleinberg 21 which with the pressure side 9 of the gear pump 1 is fluidly connected (Fig. 2, 3), or which with an external pressure source or a so-called pure oil control (oil pressure, is taken after the oil filter), in communication (Fig. 4, 5).
- a so-called pure oil control oil pressure, is taken after the oil filter
- Fig. 4, 5 so-called pure oil control
- the return to the normal position takes place via a in the spring chamber 30 arranged return spring 28, for example, a compression spring, or an electric servomotor.
- the deflection of the control shaft 7 in the control position instead of by the pump pressure also by take the electric servomotor.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
- Fig. 1
- die erfindungsgemäße Zahnradpumpe in einem Schnitt gemäß der Linie I-I in den Fig. 1 und Fig. 2,
- Fig. 2
- die Zahnradpumpe in einem Schnitt gemäß der Linie II-II in Fig. 1 in der Ruhestellung in einer ersten erfindungsgemäßen Ausführungsvariante,
- Fig. 3
- diese Zahnradpumpe in einem Schnitt gemäß der Linie II-II in Fig. 1 in einer Regelstellung,
- Fig. 4
- und Fig. 5 eine Zahnradpumpe in einer zweiten erfindungsgemäßen Ausführungsvariante analog zu Fig. 2 und Fig. 3, und
- Fig. 6
- eine Abdichtscheibe in einer alternativen Ausführungsvariante der Erfindung in einem Längsschnitt.
Claims (15)
- Zahnradpumpe (1) mit veränderbarem Fördervolumen mit zwei miteinander im Zahneingriff (23) stehenden außenverzahnten Zahnrädern (2, 3), welche in einem Förderraum (11) eines Pumpengehäuses (4) drehbar gelagert sind, wobei zumindest eines der beiden Zahnräder (3) über eine Antriebswelle (5) antreibbar ist und eines der beiden Zahnräder (2), vorzugsweise das abgetriebene Zahnrad (2), in Richtung der Achse (2') dieses Zahnrades (2) verschiebbar ausgebildet ist, wobei ein durch den in axialer Richtung gemessenen Abstand zwischen einer im wesentlichen ebenen ersten Innenseitenwand (11a) des Förderraumes (11) des Pumpengehäuses (4) und einer ersten Stirnseite (2a) des verschiebbaren Zahnrades (2) definiertes Spaltmaß (10) veränderbar ist und dadurch gekennzeichnet, dass eine der ersten Innenseitenwand (11a) gegenüberliegende und zu dieser parallele ebene zweite Innenseitenwand (11b) des Förderraumes (11) im Bereich einer der ersten Stirnseite (2a) abgewandten zweiten Stirnseite (2b) des verschiebbaren Zahnrades (2) eine konzentrisch zur Achse (2') ausgebildete, im wesentlichen zylindrische Nische (22) aufweist, deren Durchmesser (D) zumindest im Bereich des verschiebbaren Zahnrades (2) größer als der Außendurchmesser d des Zahnrades (2) ist.
- Zahnradpumpe (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Spaltmaß (10) in einem Bereich zwischen 0 bis d/5, vorzugsweise in einem Bereich zwischen 0 bis d/50 veränderbar ist, wobei d der Außendurchmesser des verschiebbaren Zahnrades (2) ist.
- Zahnradpumpe (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass im Bereich der Nische (22) eine vorzugsweise tellerförmige Abdichtscheibe (6) angeordnet ist, welche den Förderraum (11) des Pumpengehäuses (4) von einem Totraum (12) innerhalb der Nische (22) vom Förderraum (11) trennt, wobei vorzugsweise die Abdichtscheibe (6) drehfest mit dem verschiebbaren Zahnrad (2) verbunden ist.
- Zahnradpumpe (1) nach Anspruch 3, dadurch gekennzeichnet, dass die Abdichtscheibe (6) auf der der zweiten Stirnseite (2b) zugewandten Seite im Bereich jedes Zahnzwischenraumes (14) des verschiebbaren Zahnrades (2) zumindest eine radiale Entlastungsnut (13) aufweist.
- Zahnradpumpe (1) nach Anspruch 4, dadurch gekennzeichnet, dass im Bereich des druckseitigen Zahneingriffes (23) der beiden Zahnräder (2, 3) auf der Seite der Abdichtscheibe (6) in die der ersten Innenseitenwand (11a) gegenüberliegende zweite Innenseitenwand (11b) des Förderraumes (11) eine Austrittsnut (15) eingeformt ist, welche so angeordnet ist, dass während einer Umdrehung der Abdichtscheibe (6) jede Entlastungsnut (13) zumindest einmalig mit der Austrittsnut (15) kommuniziert.
- Zahnradpumpe (1) nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass vom Totraum (12) ein Leckagekanal ausgeht.
- Zahnradpumpe (1) nach Anspruch 6, dadurch gekennzeichnet, dass der Leckagekanal durch eine vorzugsweise spiralförmig in das Pumpengehäuse (4) angrenzend an die Regelwelle (7) eingeformte Leckagenut (29) gebildet ist.
- Zahnradpumpe (1) nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, dass der Totraum (12) über einen Entlastungskanal (25) mit einer Drucksenke, vorzugsweise mit der Saugseite (8) oder der Pumpenumgebung strömungsverbindbar ist, wobei vorzugsweise im Entlastungskanal (25) ein in Richtung der Drucksenke öffnendes Druckentlastungsventil (26) angeordnet ist.
- Zahnradpumpe (1) nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, dass die Abdichtscheibe (6) in ihrem Mantelbereich zumindest eine umlaufende Dichtnut (27) aufweist.
- Zahnradpumpe (1) nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das verschiebbare Zahnrad (2), vorzugsweise auch die Abdichtscheibe (6), starr auf einer im Pumpengehäuse (4) drehbar und in Richtung der Achse (2') verschiebbaren Regelwelle (7) angeordnet ist.
- Zahnradpumpe (1) nach Anspruch 10, dadurch gekennzeichnet, dass die Regelwelle (7) zur axialen Verstellung zumindest einen Druckkolben (17) aufweist, welcher an einen mit einem Druckmedium verbindbaren Druckraum (19) grenzt.
- Zahnradpumpe (1) nach Anspruch 11, dadurch gekennzeichnet, dass das Druckmedium durch das Fördermedium gebildet ist und der Druckraum (19) mit der Druckseite (9) der Zahnradpumpe (1) strömungsverbunden ist.
- Zahnradpumpe (1) nach Anspruch 11, dadurch gekennzeichnet, dass der Druckraum (19) mit einer externen Druckquelle oder einer Reinölsteuerungseinrichtung verbunden ist.
- Zahnradpumpe (1) nach einem der Ansprüche 8 bis 13, dadurch gekennzeichnet, dass auf die Regelwelle (7) entgegen der Auslenkrichtung durch den Druckkolben (17) eine Rückstellfeder einwirkt.
- Zahnradpumpe (1) nach einem der Ansprüche 8 bis 14, dadurch gekennzeichnet, dass die Regelwelle (7) zumindest in einer Richtung, durch einen elektrischen Stellmotor verstellbar ist.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04450056T ATE307293T1 (de) | 2003-03-28 | 2004-03-11 | Zahnradpumpe |
PL04450056T PL1462654T3 (pl) | 2003-03-28 | 2004-03-11 | Pompa zębata |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0049303A AT413140B (de) | 2003-03-28 | 2003-03-28 | Zahnradpumpe |
AT4932003 | 2003-03-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1462654A1 EP1462654A1 (de) | 2004-09-29 |
EP1462654B1 true EP1462654B1 (de) | 2005-10-19 |
Family
ID=32777542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04450056A Expired - Lifetime EP1462654B1 (de) | 2003-03-28 | 2004-03-11 | Zahnradpumpe |
Country Status (7)
Country | Link |
---|---|
US (1) | US7137798B2 (de) |
EP (1) | EP1462654B1 (de) |
JP (1) | JP2004301125A (de) |
AT (2) | AT413140B (de) |
DE (1) | DE502004000102D1 (de) |
ES (1) | ES2247580T3 (de) |
PL (1) | PL1462654T3 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1730405A1 (de) * | 2003-12-10 | 2006-12-13 | Dieter Dipl.-Ing. Voigt | Drehzahlabh ngige druckregelung von lpumpen |
DE102004026048A1 (de) * | 2004-05-25 | 2005-12-29 | Cor Pumps + Compressors Ag | Spaltverluststromsteuerung |
US8302353B2 (en) | 2004-10-15 | 2012-11-06 | Thomas Bren | Water intrusion prevention method and apparatus |
EP1828607A4 (de) * | 2004-12-22 | 2012-12-19 | Magna Powertrain Usa Inc | Gerotorpumpe mit veränderlichem fördervolumen |
US20070201989A1 (en) * | 2005-10-14 | 2007-08-30 | Parker-Hannifin | Low ripple gear pump/motor |
US7717690B2 (en) * | 2006-08-15 | 2010-05-18 | Tbk Co., Ltd. | Gear pump |
BRPI1001768A2 (pt) * | 2010-05-24 | 2012-01-24 | Jose Luiz Bertazzolli | transmissão continuamente variável |
DE102010038430B4 (de) * | 2010-07-26 | 2012-12-06 | Schwäbische Hüttenwerke Automotive GmbH | Verdrängerpumpe mit Absaugnut |
JP5909966B2 (ja) * | 2011-09-30 | 2016-04-27 | 株式会社Lixil | ポンプ及び洗浄装置 |
RU2511848C1 (ru) * | 2012-11-06 | 2014-04-10 | Анатолий Константинович Маришкин | Регулируемый шестеренный насос |
CN105041639A (zh) * | 2015-08-27 | 2015-11-11 | 刘凡 | 一种外啮合变量齿轮泵 |
US10113546B2 (en) | 2016-08-16 | 2018-10-30 | Caterpillar Inc. | Pump for an engine |
CN110069898B (zh) * | 2019-05-30 | 2023-02-07 | 河南航天液压气动技术有限公司 | 一种齿轮泵设计容积效率计算的方法 |
CN110608130B (zh) * | 2019-10-12 | 2024-03-26 | 山东路得威工程机械制造有限公司 | 一种高速液压马达 |
Family Cites Families (18)
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US2052419A (en) * | 1934-09-14 | 1936-08-25 | Manning Maxwell & Moore Inc | Variable delivery gear pump |
US2434135A (en) * | 1942-12-02 | 1948-01-06 | Eaton Mfg Co | Gear pump structure |
US3110265A (en) * | 1961-08-31 | 1963-11-12 | Wendell S Miller | Gear type fluid handling device |
DE2806951A1 (de) | 1978-02-18 | 1979-08-30 | Bayer Ag | N-acylaminohydroxynaphthalinsulfonsaeuresalze |
PL137198B1 (en) * | 1982-07-21 | 1986-05-31 | Typowych Elementow Hydrauliki | Hydraulic gear pump or motor |
DE3528651A1 (de) * | 1985-08-09 | 1987-02-19 | Rohs Hans Guenther Prof Dr Ing | Zahnradpumpe |
CN1009024B (zh) * | 1986-09-24 | 1990-08-01 | 郑悦 | 轴向变量泵或马达 |
DE4121074A1 (de) * | 1991-06-26 | 1993-01-07 | Pierburg Gmbh | Aussenzahnradpumpe |
GB2265945B (en) * | 1992-04-10 | 1995-07-05 | Charles Lee | Variable gear pump |
US5306127A (en) * | 1993-03-08 | 1994-04-26 | Kinney Gerald R | Fluid pump with axially adjustable gears |
US5724812A (en) * | 1996-02-16 | 1998-03-10 | Baker; William E. | Variable displacement apparatus and method of using same |
DE19631956C2 (de) * | 1996-08-08 | 1998-07-02 | Danfoss As | Zahnradpumpe mit einstellbarem Verdrängungsvolumen |
US6244839B1 (en) * | 1997-11-14 | 2001-06-12 | University Of Arkansas | Pressure compensated variable displacement internal gear pumps |
JPH11343982A (ja) * | 1998-05-30 | 1999-12-14 | Suzuki Motor Corp | トロコイド型オイルポンプ |
DE19847132C2 (de) * | 1998-10-13 | 2001-05-31 | Schwaebische Huettenwerke Gmbh | Außenzahnradpumpe mit Fördervolumenbegrenzung |
AT3767U1 (de) * | 1999-05-06 | 2000-07-25 | Avl List Gmbh | Zahnradpumpe mit veränderbarem fördervolumen |
RU2177085C2 (ru) * | 1999-05-07 | 2001-12-20 | Бодогазин Сергей Борисович | Насос шестеренный регулируемый |
DE19924057A1 (de) * | 1999-05-26 | 2000-11-30 | Bosch Gmbh Robert | Zahnradmaschine (Pumpe oder Motor) |
-
2003
- 2003-03-28 AT AT0049303A patent/AT413140B/de not_active IP Right Cessation
-
2004
- 2004-03-11 DE DE502004000102T patent/DE502004000102D1/de not_active Expired - Lifetime
- 2004-03-11 ES ES04450056T patent/ES2247580T3/es not_active Expired - Lifetime
- 2004-03-11 AT AT04450056T patent/ATE307293T1/de not_active IP Right Cessation
- 2004-03-11 EP EP04450056A patent/EP1462654B1/de not_active Expired - Lifetime
- 2004-03-11 PL PL04450056T patent/PL1462654T3/pl unknown
- 2004-03-26 US US10/809,907 patent/US7137798B2/en not_active Expired - Fee Related
- 2004-03-29 JP JP2004094858A patent/JP2004301125A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
US7137798B2 (en) | 2006-11-21 |
ATA4932003A (de) | 2005-04-15 |
JP2004301125A (ja) | 2004-10-28 |
AT413140B (de) | 2005-11-15 |
DE502004000102D1 (de) | 2006-03-02 |
ATE307293T1 (de) | 2005-11-15 |
EP1462654A1 (de) | 2004-09-29 |
ES2247580T3 (es) | 2006-03-01 |
PL1462654T3 (pl) | 2005-12-30 |
US20040191103A1 (en) | 2004-09-30 |
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