WO2006049500A1 - Pompe a engrenages a capacite variable - Google Patents

Pompe a engrenages a capacite variable Download PDF

Info

Publication number
WO2006049500A1
WO2006049500A1 PCT/NL2005/000784 NL2005000784W WO2006049500A1 WO 2006049500 A1 WO2006049500 A1 WO 2006049500A1 NL 2005000784 W NL2005000784 W NL 2005000784W WO 2006049500 A1 WO2006049500 A1 WO 2006049500A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear wheel
liquid chamber
liquid
gear
length
Prior art date
Application number
PCT/NL2005/000784
Other languages
English (en)
Inventor
Tjerk Kingma
Richard De Roos
Original Assignee
Tjerk Kingma
Richard De Roos
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 Tjerk Kingma, Richard De Roos filed Critical Tjerk Kingma
Publication of WO2006049500A1 publication Critical patent/WO2006049500A1/fr

Links

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
    • 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
    • F04C2/18—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 with similar tooth forms
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/20—Flow

Definitions

  • the invention relates to a liquid pump comprising a housing with a first liquid chamber having a first external port and a second liquid chamber having a second external port, a first gear wheel and a second gear wheel which separate the first liquid chamber and the second liquid chamber from each other, wherein the gear wheels are axially displaceable relative to each other so that the second gear wheel can be brought into engagement with the first gear wheel along a length 11, such that by rotating these gear wheels a volume flow which is proportional to the length 11 is brought about from the first liquid chamber to the second liquid chamber.
  • Such a pump is described in US-A-2001/0024618.
  • the output (Q) of such a pump is determined by the area of the gear cavity (A), the length of the gear cavity (1), the number of gear cavities (s) on the driven gear wheel and the rotation speed (h) of the driven gear wheel. This times two because there are two gear wheels.
  • Q A x l x s x h x 2.
  • the gear cavity length (1) is varied in order to enable adjustment of the output.
  • the operative gear cavity length (1) is changed by displacing the gear wheels relative to each other.
  • the output can hereby vary, but not from zero to the maximum since if the output were zero the gear wheels would no longer engage each other. Nor can the flow direction of the liquid between the external ports be reversed.
  • the housing comprises a third gear wheel which also separates the first liquid chamber and the second liquid chamber from each other and which can be placed into engagement over a length 12 with the first gear wheel or a gear wheel which is connected fixedly thereto in non- rotatable and axial manner and which also separates the first liquid chamber and the second liquid chamber from each other, such that owing to said rotation of these gear wheels a volume flow which is proportional to the length 12 is brought about from the second liquid chamber to the first liquid chamber.
  • the output and flow direction of the pump can hereby be adjusted by mutually displacing the gear wheels in axial direction while the gear wheels are rotated substantially at a constant speed and in only one direction.
  • the total output, the volume flow from the first port to the second port, is proportional to the length 11 minus the length 12.
  • a continuously adjustable output from zero to the maximum and a reversible flow can thus be achieved in the pump using a single rotation direction.
  • the pump is preferably manufactured such that the total of the lengths 11 and 12 is the same in different axial positions of the first gear wheel.
  • the first liquid chamber preferably comprises an orifice which extends between the liquid inlet side of the first and second gear wheel and the liquid outlet side of the first and third gear wheel
  • the second liquid chamber comprises an orifice which extends between the liquid inlet side of the first and third gear wheel and the liquid outlet side of the first and second gear wheel.
  • the second and the third gear wheel are preferably mounted at a fixed mutual distance as seen in axial direction.
  • the second and the third gear wheel extend co-axially to each other.
  • the first gear wheel is here preferably movable axially in a gear ring with complementary internal gearing, which internal gearing forms a separating wall extending between the first and the second liquid chamber.
  • the invention also relates to a method for displacing a liquid, wherein the liquid is displaced between a first external port in a first liquid chamber and a second external port in a second liquid chamber, wherein a first gear wheel and a second gear wheel which separate the first liquid chamber and the second liquid chamber from each other are displaced axially relative to each other so that the second gear wheel is brought into engagement with the first gear wheel over a length 11, wherein these gear wheels are rotated such that a volume flow which is proportional to the length 11 is brought about from the first liquid chamber to the second liquid chamber, and wherein a third gear wheel is brought into engagement over a length 12 with the first gear wheel or a gear wheel fixedly connected thereto in non- rotatable and axial manner, such that a volume flow which is proportional to the length 12 is brought about from the second liquid chamber to the first liquid chamber.
  • Figure 1 shows a perspective view of a first exemplary embodiment of a pump according to the invention
  • Figure 2 shows an exploded view of the pump according to figure 1;
  • Figure 3 shows a cross-section of the pump as according to arrows III in figure 1;
  • Figure 4 shows a cross-section of the pump as according to arrows IV in figure 1;
  • Figures 5A, 5B and 5C show schematically the operation of the pump of figures 1-4;
  • Figure 6 shows a graph of the output of the pump in relation to the position of the displaceable gear wheel in the pump of figure 1;
  • Figure 7 is a perspective view of a second exemplary embodiment of a pump according to the invention.
  • Figure 8 shows a partially exploded view of the pump of figure 7
  • Figure 9 is a perspective view of connecting blocks with orifices of the pump as according to arrow IX in figure 7;
  • Figure 10 shows a cross-section of the pump as according to arrows X in figure 7;
  • Figure 11 is a perspective view of an internal gear ring as according to arrow XI in figure 10;
  • FIGS 12A, 12B and 12C show schematically the operation of the pump of figures 7-11.
  • the pump according to figures 1-4 comprises a housing 1 with a recess 2 formed substantially by three parallel cylindrical bores which partially overlap each other.
  • Substantially cylindrical bearing blocks 3, 4, 5, 6, 7, 8 are arranged in the respective bores, in which bearing blocks are suspended gear wheels 10, 11, 12.
  • Bearing blocks 3, 4, 5, 6, 7, 8 also close off the parts of the end surfaces of gear wheels 10, 11, 12 which are not in engagement with an opposite gear wheel.
  • the housing is closed on both sides by a cover 13, 14.
  • the upper gear wheel 10 and the lower gear wheel 12 are arranged fixedly but mutually offset in housing 1.
  • the middle gear wheel 11 can slide back and forth in axial direction between upper gear wheel 10 and lower gear wheel 12.
  • the hollow shaft 15 of the middle gear wheel 11 is mounted in two bearing blocks 5, 6 which can move like pistons in cylinders 16, 17.
  • Hollow shaft 15 is provided with a key way and slides over a central shaft 18 which is provided with a key and which extends outside cover 13, where it can be driven.
  • Housing 1 is provided at the front and rear with bores 19, 20, 21, 22 which extend from the engaging zones of gear wheels 10, 11, 12, and which form ports to which liquid conduits can be connected.
  • Figure 4 shows schematically by means of broken lines 23, 24 how these conduits can extend according to the invention. Bores 19, 20 and conduit 24 together form a first liquid chamber, bores 21, 22 and conduit 25 together form a second liquid chamber.
  • the pump can be considered as two gear pumps which are coupled to each other and which each have their own output.
  • the dimensions of the gear wheels are chosen such that there is no pulsation action, so that there is a uniform output.
  • FIG. 5A the middle gear wheel 11 is situated in the middle position.
  • the hatched portions represent the operative gear cavity lengths 11 and 12, and these are here both the same length.
  • the output of the upper two gear wheels 10, 11 is thereby equal to the output of the lower two gear wheels 11, 12.
  • the outlet side of the upper two gear wheels 10, 11 is coupled to the inlet side of the lower two gear wheels 11, 12 by means of a first channel 23, and the outlet side of the lower two gear wheels 11, 12 is coupled to the inlet side of the upper two gear wheels 10, 11 by means of a second channel 24.
  • the oil hereby circulates and there is no output.
  • the channels 23, 24 can be absent or closed, whereby the pump can be used to generate two different complementary outputs.
  • Such a pump is very suitable as control pump or as hydraulic barrier for wheeled vehicles.
  • the figures 7-11 show a second exemplary embodiment of the pump in which the lower gear wheel 111 is displaceable and the upper gear wheels 110, 112 are not displaceable.
  • the pump has four ports 119, 120, 121, 122. Port 119 and port 122 are mutually connected by means of an orifice 123 and together form a first liquid chamber, port 120 and port 121 are mutually connected by means of an orifice 124 and together form a second liquid chamber.
  • the lower gear wheel 111 is displaced into the extreme left-hand position.
  • the operative gear cavity lengths 11, 12 are varied with the lower long gear wheel 111 which is placed through a gear ring 125 with internal gearing, as shown in figure 11, and can be moved reciprocally therein.
  • Gear ring 125 precisely encloses the lower gear wheel 111.
  • the pump has to the right of the lower gear wheel 111 a cylinder 117 in which there is a piston 106.
  • the piston presses against the lower gear wheel 111 in order to obtain a good sealing on the side of gear wheel 111.
  • These two pistons 105, 106 can slide the long lower gear wheel 111 back and forth in the same manner in which the piston of a hydraulic cylinder is moved back and forth, for instance with an external control valve block.
  • the lower gear wheel 111 can also be moved reciprocally in mechanical, electrical or pneumatic manner.
  • Shaft 115 of lower gear wheel 111 is connected with a slide coupling 136 to drive shaft 118 which is mounted in clearance-free manner in two conical roller bearings 126, 127, and cannot displace.
  • a cover 128 and thin filler plates 129, 130, 131, 132 the conical roller bearings 126, 127 are enclosed in the bearing housing.
  • An oil sealing ring 133 provides for oil sealing of the bearing housing which is connected in every situation to the suction side of the pomp.
  • the upper gear wheels 110, 112 cannot slide and are sealed on the side by a piston 103 on the left and a piston 104 on the right. These pistons have the same diameter as gear wheels 110, 112.
  • the upper bore 102 in housing 101 serves here as cylinder.
  • a spacer 109 which provides the correct distance between the upper gear wheels 110, 112 and the seal on the side of these upper gear wheels 110, 112.
  • the width of spacer 109 is the same as the width of gear ring 125.
  • the pressure side of the left-hand section is connected to the suction side of the right-hand section with an orifice 123 which runs underneath.
  • the pressure side of the right- hand section is connected to the suction side of the left- hand section with an orifice 124 which runs over the top.
  • Mounted on the outer side of the housing are two connecting blocks 134, 135 to which the orifices 123, 124 are connected.
  • On these connecting blocks 134, 135 are external connecting options to which conduits or hoses can be connected.
  • the ports to which no external conduit or hose is connected is closed.
  • pressure port 212 produces for instance 50 cc oil per rotation. Because port 121 is connected to port 120, all oil flows to port 120 because port 120 also draws in 50 cc per rotation. Port 122 also produces 50 cc per rotation. Because port 122 is connected to port 119, all oil flows to port 119 because port 119 also draws in 50 cc per rotation. The output of the pump in this position (middle position) of lower gear wheel 111 is zero.
  • a hydraulic user for instance a hydraulic motor, can be connected between port 122 (or port 119) and port 121 (or port 120) . Because lower gear wheel 111 can be displaced from the middle position (the zero position) , the output can be regulated from zero to the maximum in continuously variable manner.
  • lower gear wheel 111 is first carried back again to the middle position, whereby the output once again becomes zero.
  • the middle gear wheel 111 By sliding the middle gear wheel 111 through to the right the output becomes greater again, but in reverse direction as shown in figure 12C.
  • Port 122 hereby becomes a pressure port and port 121 a suction port.
  • the flow direction in the pump is always the same in all cases and does not change.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

La pompe à engrenages à capacité variable, objet de l'invention, comporte une première chambre liquide et une deuxième chambre liquide, un premier pignon d'engrenage (11, 111) et un deuxième pignon d'engrenage (10, 110) qui assurent la séparation entre les chambres liquides, les pignons d'engrenage pouvant être déplacés l'un par rapport à l'autre dans le plan axial, pour qu'il soit possible de mettre le deuxième pignon d'engrenage en engagement avec le premier pignon d'engrenage le long d'une longueur 11, avec un débit volume se rendant de la première chambre liquide à la deuxième chambre liquide, proportionnel à la longueur 11. Par ailleurs, l'invention décrit un troisième pignon d'engrenage (12, 112) dont le rôle consiste également à séparer les deux chambres liquides l'une de l'autre, et qui peut être mis en engagement, sur une longueur 12, avec le premier pignon d'engrenage ou bien avec un pignon d'engrenage qui y est raccordé de façon fixe, non-rotative et axiale, et qui sépare également les deux chambres liquides l'une de l'autre, de sorte qu'un débit volume, qui est proportionnel à la longueur 12, soit généré à partir de la deuxième chambre liquide pour se rendre à la première chambre liquide.
PCT/NL2005/000784 2004-11-08 2005-11-08 Pompe a engrenages a capacite variable WO2006049500A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1027440A NL1027440C2 (nl) 2004-11-08 2004-11-08 Vloeistofpomp en werkwijze voor het verplaatsen van een vloeistof.
NL1027440 2004-11-08

Publications (1)

Publication Number Publication Date
WO2006049500A1 true WO2006049500A1 (fr) 2006-05-11

Family

ID=34974815

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2005/000784 WO2006049500A1 (fr) 2004-11-08 2005-11-08 Pompe a engrenages a capacite variable

Country Status (2)

Country Link
NL (1) NL1027440C2 (fr)
WO (1) WO2006049500A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011129776A2 (fr) 2010-04-12 2011-10-20 Pavol Figura Pompe a engrenages a debit de sortie variable"en continu
DE102014204069A1 (de) * 2014-03-06 2015-09-10 Robert Bosch Gmbh Ventilscheibe
US9388883B2 (en) 2010-05-24 2016-07-12 Jose Luiz Bertazzoli Continuously variable transmission
EP2295803A3 (fr) * 2009-08-12 2016-11-16 Robert Bosch GmbH Elément de verrouillage pour une machine à engrenages.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE409898C (de) * 1921-05-28 1925-02-16 Oliver Lendl Vorrichtung zur Sicherung der Drehbewegung der Foerderraeder von Zahnradpumpen mit zur Leistungsaenderung achsialer Verstellbarkeit
US2149326A (en) * 1937-04-27 1939-03-07 George W Wilkin Variable capacity gear pump
US2526830A (en) * 1945-06-22 1950-10-24 Hpm Dev Corp Variable delivery gear pump
DE2008952A1 (de) * 1970-02-26 1971-09-09 Tuppeck, Horst F.W., 4133 Neukirchen-Vluyn Regelbare Zahnradpumpe
US5620315A (en) * 1993-03-31 1997-04-15 Sandra Hutter Gear pump for feeding of fluids

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE409898C (de) * 1921-05-28 1925-02-16 Oliver Lendl Vorrichtung zur Sicherung der Drehbewegung der Foerderraeder von Zahnradpumpen mit zur Leistungsaenderung achsialer Verstellbarkeit
US2149326A (en) * 1937-04-27 1939-03-07 George W Wilkin Variable capacity gear pump
US2526830A (en) * 1945-06-22 1950-10-24 Hpm Dev Corp Variable delivery gear pump
DE2008952A1 (de) * 1970-02-26 1971-09-09 Tuppeck, Horst F.W., 4133 Neukirchen-Vluyn Regelbare Zahnradpumpe
US5620315A (en) * 1993-03-31 1997-04-15 Sandra Hutter Gear pump for feeding of fluids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2295803A3 (fr) * 2009-08-12 2016-11-16 Robert Bosch GmbH Elément de verrouillage pour une machine à engrenages.
WO2011129776A2 (fr) 2010-04-12 2011-10-20 Pavol Figura Pompe a engrenages a debit de sortie variable"en continu
JP2013524102A (ja) * 2010-04-12 2013-06-17 パヴォル フィグラ 連続可変出力流量を有するギヤポンプ
US9388883B2 (en) 2010-05-24 2016-07-12 Jose Luiz Bertazzoli Continuously variable transmission
DE102014204069A1 (de) * 2014-03-06 2015-09-10 Robert Bosch Gmbh Ventilscheibe

Also Published As

Publication number Publication date
NL1027440C2 (nl) 2006-05-09

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