EP3380733B1 - Gear pump - Google Patents
Gear pump Download PDFInfo
- Publication number
- EP3380733B1 EP3380733B1 EP16800919.9A EP16800919A EP3380733B1 EP 3380733 B1 EP3380733 B1 EP 3380733B1 EP 16800919 A EP16800919 A EP 16800919A EP 3380733 B1 EP3380733 B1 EP 3380733B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bush
- stator unit
- cavity
- gear pump
- gear
- 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.)
- Active
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Classifications
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- 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
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/008—Prime movers
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- 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
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
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- 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
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/203—Fuel
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- 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
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/23—Manufacture essentially without removing material by permanently joining parts together
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- 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
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
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- 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
- F04C2240/00—Components
- F04C2240/40—Electric motor
Definitions
- the present invention relates to a gear pump for pumping liquids.
- the present invention relates to an electrically operated gear pump which can advantageously be used to feed fuel to an internal combustion engine. This is a use to which the text which follows will make explicit reference, without thereby losing generality.
- a number of models of electrically operated gear pumps for liquids comprise: an annular stator unit capable of generating a rotating magnetic field; a ring gear with inner toothing, which is inserted/fitted in an axially rotatable manner on the inside of the stator unit; and finally a gear wheel, which is fitted in an axially rotatable manner on a support pin positioned eccentrically on the inside of the ring gear and meshes on the inner toothing of the ring gear.
- the rotation of the ring gear on the inside of the stator unit creates a movable volume that is capable of transferring a predetermined quantity of fuel or other liquid from the intake port of the pump to the delivery port of said pump.
- the flow of the liquid exiting the pump obviously depends on the speed of rotation of the ring gear.
- the gear pump is finally also equipped with a tubular bush, which is interposed between the outer surface of the ring gear and the inner surface of the stator unit in such a way as to reduce the wear of the two components and at the same time facilitate the insertion of the two gears into the stator unit.
- the tubular bush is generally fixed immovably on the inside of the stator unit by means of the adhesive which is injected into the interstitial space between the bush and the stator unit.
- the mechanical play present between the bush and the stator unit is reduced to such an extent as to make it extremely difficult for the adhesive to penetrate between the two components, and therefore the adhesive is injected into the interstitial space between the bush and the stator unit by means of particularly complicated and expensive machinery.
- DE 10 2009 028 148 A1 discloses a gear pump according to the preamble of claim 1.
- the present invention provides a gear pump as defined in Claim 1 and preferably, but not necessarily, in any one of the claims dependent thereon.
- the present invention also provides a method for assembling a gear pump as defined in Claim 9 and preferably, but not necessarily, in any one of the claims dependent thereon.
- the numeral 1 denotes, in its entirety, an electrically operated gear pump for pumping liquids, which can advantageously be used to feed fuel to an internal combustion engine.
- the gear pump 1 comprises essentially: a stator unit 2, which is equipped internally with a substantially cylindrical cavity 3 and is structured in such a way as to be able to generate a magnetic field rotating on the inside of the cavity 3; a substantially tubular, cylindrical bush 4, which is keyed/inserted on the inside of the cavity 3 immovably and preferably also in such a way as to rest substantially uniformly on the inner surface of the stator unit 2; and at least one pumping gear housed in an axially rotatable manner on the inside of the bush.
- the gear pump 1 is preferably equipped with a pair of pumping gears 5 and 6, which are housed in an axially rotatable manner on the inside of the tubular bush 4 and at the same time mesh into one another.
- the bush 4 is preferably formed by a tubular cylindrical body preferably made of a plastic material.
- the thickness of the tubular body 4 is preferably furthermore between 0.1 and 3 mm (millimetres).
- the stator unit 2 comprises a plurality of polar cores 8, which are preferably made of a magnetic material, are evenly spaced angularly about the longitudinal axis A of the cavity 3, and are equipped with polar heads 9, which face the cavity 3 and contribute to delimiting/defining the perimeter of the cavity 3; and the outer surface of the tubular bush 4 rests directly on the polar heads 9 of the various polar cores 8.
- each polar core 8 is preferably formed by a stack of laminations, which are placed closely next to one another and are preferably made of a ferromagnetic material.
- stator unit 2 further also comprises a preferably substantially cylindrical outer tubular jacket 10, which is preferably made of a metallic material and extends coaxially with the longitudinal axis A in such a way as to surround the polar cores 8 of the stator unit 2 and the bush 4.
- a substantially cylindrical outer tubular jacket 10 which is preferably made of a metallic material and extends coaxially with the longitudinal axis A in such a way as to surround the polar cores 8 of the stator unit 2 and the bush 4.
- each polar core 8 further forms a link and/or extends in a cantilevered manner from the tubular jacket 10 towards the bush 4 positioned in the centre of said tubular jacket 10.
- the tubular jacket 10 is also preferably formed by a stack of laminations, which are placed closely next to one another and are preferably made of a ferromagnetic material, and the polar cores 8 are preferably formed in one piece with the tubular jacket 10.
- the metallic laminations which form the outer tubular jacket 10 are cut in such a way as to also form the polar cores 8.
- the stator unit 2 further also comprises a series of induction coils 11, which are wound around the various polar cores 8 in such a way as to be able to generate, when electric current passes through them, a radial magnetic field on the inside of the cavity 3.
- a series of induction coils 11 of the stator unit 2 By energizing the induction coils 11 of the stator unit 2 in a known manner, it is possible to generate, on the inside of the cavity 3 and of the tubular bush 4, a radial magnetic field which rotates about the longitudinal axis A of the cavity 3 and is capable of driving at least one of the pumping gears 5 and 6 to rotate.
- the groove or grooves for supplying the adhesive 12 is or are preferably also substantially rectilinear and/or locally parallel with one another, and optionally also parallel to the longitudinal axis A of the cavity 3 and of the bush 4.
- the zone of contact between the tubular bush 4 and the stator unit 2, or more precisely between the tubular bush 4 and at least one of the polar heads 9 of the stator unit 2, is preferably provided with a plurality of grooves for supplying the adhesive 12 which are arranged one alongside another.
- the groove or grooves for supplying the adhesive 12 is or are preferably formed directly on the polar head 9.
- the groove or grooves for supplying the adhesive 12 extends or extend along the cylindrical surface of the polar head 9, preferably remaining parallel to the longitudinal axis A and preferably over the entire axial length f of the polar head 9.
- the groove or grooves for supplying the adhesive 12 is or are preferably formed by appropriately cutting/severing the laminations which contribute to forming the polar core 8.
- each one of the polar heads 9 of the stator unit 2 is preferably equipped with a plurality of grooves for supplying the adhesive 12, which extend on the cylindrical surface of the polar head 9 one alongside another, over the entire axial length f of the polar head 9, and are dimensioned in such a way as to conduct/allow the flow of the adhesive needed to permanently fix the tubular bush 4 to the stator unit 2 rapidly inside the interstitial space between the tubular bush 4 and the stator unit 2.
- the grooves for supplying the adhesive 12 are also spaced apart in a substantially uniform manner along the entire width of the polar head 9.
- the pair of pumping gears on the other hand, to comprise: a circular ring gear 5, which has the toothing on its inside, i.e. facing towards the centre, and is housed in an axially rotatable manner on the inside of the bush 4, coaxially with the longitudinal axis A of the cavity 3 and of the bush 4; and a gear wheel 6, which is fitted in an axially rotatable manner on a support pin 13 positioned eccentrically on the inside of the ring gear 5 and meshes on the inner toothing of the ring gear 5.
- the ring gear 5 is preferably made of a plastic material or of a sintered metallic material and preferably internally incorporates a series of permanent magnets (not shown), which interact with the rotating magnetic field generated by the stator unit 2, producing a torque which drives the ring gear 5 to rotate about the longitudinal axis A.
- the ring gear 5 may have a series of cavities, which locally attenuate the magnetic flux and interact with the rotating magnetic field generated by the stator unit 2, producing a torque which drives the ring gear 5 to rotate about the longitudinal axis A.
- the ring gear 5 may also internally incorporate a series of elements made of an electrically conductive material which are arranged in such a way as to form a squirrel cage.
- the gear wheel 6 is also preferably made of a plastic material or of a sintered metallic material.
- the gear pump 1 is finally provided with an outer casing 14, which is equipped on the inside with a structured/shaped cavity for accommodating the stator unit 2, the tubular bush 4 and the two pumping gears 5 and 6 and at the same time closing the two axial ends of the cavity 3, preferably in a fluid-tight manner.
- the support pin 13 of the gear wheel 6 is preferably furthermore fixed firmly on the outer casing 14.
- the outer casing 14 preferably comprises: a substantially cylindrical cup-shaped body 15, which is dimensioned so as to be able to accommodate, resting on the bottom thereof, the stator unit 2, the tubular bush 4 and the two pumping gears 5 and 6; and a disc-shaped cover (not shown) positioned so as to close the opening of the cup-shaped body 15, in such a way as to plug the second axial end of the cavity 3.
- the support pin 13 preferably further extends in a cantilevered manner from the bottom of the cup-shaped body 15, and is preferably formed in one piece with the latter.
- gear pump 1 The operation of the gear pump 1 can easily be inferred from that described above and does not need to be explained further.
- the method for mounting the gear pump 1 provides for inserting the tubular bush 4 into the cavity 3 of the stator unit 2, and then injecting directly into the longitudinal grooves 12 the adhesive needed to immovably fix/block the tubular bush 4 on the polar heads 9 of the stator unit 2.
- the method for assembling the gear pump 1 moreover provides for inserting at least one of the two pumping gears 5, 6 into the bush 4, before inserting the bush 4 into the cavity 3 of the stator unit 2.
- the method for assembling the gear pump 1 preferably provides for inserting at least the ring gear 5 into the bush 4, before inserting the bush 4 into the cavity 3 of the stator unit 2.
- the presence of the longitudinal grooves 12 offers a number of advantages.
- the longitudinal grooves 12 make it possible to inject the adhesive more quickly into the interstitial space between the tubular bush 4 and the stator unit 2, speeding up the production process.
- longitudinal grooves 12 make it possible to distribute the adhesive with greater homogeneity in the interstitial space between the tubular bush 4 and the stator unit 2, with all the advantages this involves.
- the tubular bush 4 could be made of bronze and/or the groove or grooves for supplying the adhesive 12 could extend on the cylindrical surface of the polar head 9, following a preferably substantially helical curved trajectory.
Description
- The present invention relates to a gear pump for pumping liquids.
- More specifically, the present invention relates to an electrically operated gear pump which can advantageously be used to feed fuel to an internal combustion engine. This is a use to which the text which follows will make explicit reference, without thereby losing generality.
- As is known, a number of models of electrically operated gear pumps for liquids comprise: an annular stator unit capable of generating a rotating magnetic field; a ring gear with inner toothing, which is inserted/fitted in an axially rotatable manner on the inside of the stator unit; and finally a gear wheel, which is fitted in an axially rotatable manner on a support pin positioned eccentrically on the inside of the ring gear and meshes on the inner toothing of the ring gear.
- The rotation of the ring gear on the inside of the stator unit creates a movable volume that is capable of transferring a predetermined quantity of fuel or other liquid from the intake port of the pump to the delivery port of said pump. The flow of the liquid exiting the pump obviously depends on the speed of rotation of the ring gear.
- In some cases, the gear pump is finally also equipped with a tubular bush, which is interposed between the outer surface of the ring gear and the inner surface of the stator unit in such a way as to reduce the wear of the two components and at the same time facilitate the insertion of the two gears into the stator unit.
- Unfortunately, the assembly of the bush on the inside of the stator unit is a relatively complicated and expensive process.
- Specifically, the tubular bush is generally fixed immovably on the inside of the stator unit by means of the adhesive which is injected into the interstitial space between the bush and the stator unit. Unfortunately, however, the mechanical play present between the bush and the stator unit is reduced to such an extent as to make it extremely difficult for the adhesive to penetrate between the two components, and therefore the adhesive is injected into the interstitial space between the bush and the stator unit by means of particularly complicated and expensive machinery.
DE 10 2009 028 148 A1 discloses a gear pump according to the preamble of claim 1. - It is an object of the present invention to simplify and speed up the assembly of the gear pumps described above.
- In accordance with these objectives, the present invention provides a gear pump as defined in Claim 1 and preferably, but not necessarily, in any one of the claims dependent thereon.
- Moreover, the present invention also provides a method for assembling a gear pump as defined in
Claim 9 and preferably, but not necessarily, in any one of the claims dependent thereon. - The present invention will now be described with reference to the accompanying drawings, which illustrate a non-limiting exemplary embodiment thereof and in which:
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Figure 1 is a sectional view of a gear pump formed according to the requirements of the present invention; whereas -
Figure 2 is a partially exploded perspective view of the gear pump shown inFigure 1 , with parts removed for clarity. - With reference to
Figures 1 and2 , the numeral 1 denotes, in its entirety, an electrically operated gear pump for pumping liquids, which can advantageously be used to feed fuel to an internal combustion engine. - The gear pump 1 comprises essentially: a
stator unit 2, which is equipped internally with a substantiallycylindrical cavity 3 and is structured in such a way as to be able to generate a magnetic field rotating on the inside of thecavity 3; a substantially tubular,cylindrical bush 4, which is keyed/inserted on the inside of thecavity 3 immovably and preferably also in such a way as to rest substantially uniformly on the inner surface of thestator unit 2; and at least one pumping gear housed in an axially rotatable manner on the inside of the bush. - More specifically, the gear pump 1 is preferably equipped with a pair of pumping gears 5 and 6, which are housed in an axially rotatable manner on the inside of the
tubular bush 4 and at the same time mesh into one another. - The
bush 4, on the other hand, is preferably formed by a tubular cylindrical body preferably made of a plastic material. The thickness of thetubular body 4 is preferably furthermore between 0.1 and 3 mm (millimetres). - With reference to
Figures 1 and2 , thestator unit 2, on the other hand, comprises a plurality ofpolar cores 8, which are preferably made of a magnetic material, are evenly spaced angularly about the longitudinal axis A of thecavity 3, and are equipped withpolar heads 9, which face thecavity 3 and contribute to delimiting/defining the perimeter of thecavity 3; and the outer surface of thetubular bush 4 rests directly on thepolar heads 9 of the variouspolar cores 8. - In the example shown, in particular, each
polar core 8 is preferably formed by a stack of laminations, which are placed closely next to one another and are preferably made of a ferromagnetic material. - It is preferable that the
stator unit 2 further also comprises a preferably substantially cylindrical outertubular jacket 10, which is preferably made of a metallic material and extends coaxially with the longitudinal axis A in such a way as to surround thepolar cores 8 of thestator unit 2 and thebush 4. - It is preferable that each
polar core 8 further forms a link and/or extends in a cantilevered manner from thetubular jacket 10 towards thebush 4 positioned in the centre of saidtubular jacket 10. - More specifically, in the example shown, the
tubular jacket 10 is also preferably formed by a stack of laminations, which are placed closely next to one another and are preferably made of a ferromagnetic material, and thepolar cores 8 are preferably formed in one piece with thetubular jacket 10. - In other words, the metallic laminations which form the outer
tubular jacket 10 are cut in such a way as to also form thepolar cores 8. - With reference to
Figure 1 , thestator unit 2 further also comprises a series ofinduction coils 11, which are wound around the variouspolar cores 8 in such a way as to be able to generate, when electric current passes through them, a radial magnetic field on the inside of thecavity 3. By energizing theinduction coils 11 of thestator unit 2 in a known manner, it is possible to generate, on the inside of thecavity 3 and of thetubular bush 4, a radial magnetic field which rotates about the longitudinal axis A of thecavity 3 and is capable of driving at least one of the pumping gears 5 and 6 to rotate. - With reference to
Figures 1 and2 , the zone of contact between thetubular bush 4 and thestator unit 2, or more precisely between thetubular bush 4 and at least one of thepolar heads 9 of thestator unit 2, moreover also has one or morelongitudinal grooves 12, which extend in the interstitial space between thetubular bush 4 and thestator unit 2, preferably substantially over the entire axial length f of said zone of contact, and are dimensioned in such a way as to conduct/allow the flow of the liquid adhesive needed to permanently fix thetubular bush 4 to thestator unit 2 inside the interstitial space between thetubular bush 4 and thestator unit 2. - The groove or grooves for supplying the
adhesive 12 is or are preferably also substantially rectilinear and/or locally parallel with one another, and optionally also parallel to the longitudinal axis A of thecavity 3 and of thebush 4. - More specifically, the zone of contact between the
tubular bush 4 and thestator unit 2, or more precisely between thetubular bush 4 and at least one of thepolar heads 9 of thestator unit 2, is preferably provided with a plurality of grooves for supplying theadhesive 12 which are arranged one alongside another. - With reference to
Figures 1 and2 , in the example shown, in particular, the groove or grooves for supplying theadhesive 12 is or are preferably formed directly on thepolar head 9. - More specifically, the groove or grooves for supplying the
adhesive 12 extends or extend along the cylindrical surface of thepolar head 9, preferably remaining parallel to the longitudinal axis A and preferably over the entire axial length f of thepolar head 9. - In other words, the groove or grooves for supplying the
adhesive 12 is or are preferably formed by appropriately cutting/severing the laminations which contribute to forming thepolar core 8. - More specifically, with reference to
Figures 1 and2 , in the example shown, each one of thepolar heads 9 of thestator unit 2 is preferably equipped with a plurality of grooves for supplying the adhesive 12, which extend on the cylindrical surface of thepolar head 9 one alongside another, over the entire axial length f of thepolar head 9, and are dimensioned in such a way as to conduct/allow the flow of the adhesive needed to permanently fix thetubular bush 4 to thestator unit 2 rapidly inside the interstitial space between thetubular bush 4 and thestator unit 2. - It is preferable that the grooves for supplying the adhesive 12 are also spaced apart in a substantially uniform manner along the entire width of the
polar head 9. - With reference to
Figure 1 , it is preferable for the pair of pumping gears, on the other hand, to comprise: a circular ring gear 5, which has the toothing on its inside, i.e. facing towards the centre, and is housed in an axially rotatable manner on the inside of thebush 4, coaxially with the longitudinal axis A of thecavity 3 and of thebush 4; and a gear wheel 6, which is fitted in an axially rotatable manner on asupport pin 13 positioned eccentrically on the inside of the ring gear 5 and meshes on the inner toothing of the ring gear 5. - The ring gear 5 is preferably made of a plastic material or of a sintered metallic material and preferably internally incorporates a series of permanent magnets (not shown), which interact with the rotating magnetic field generated by the
stator unit 2, producing a torque which drives the ring gear 5 to rotate about the longitudinal axis A. - In a different embodiment, however, instead of the permanent magnets, the ring gear 5 may have a series of cavities, which locally attenuate the magnetic flux and interact with the rotating magnetic field generated by the
stator unit 2, producing a torque which drives the ring gear 5 to rotate about the longitudinal axis A. - As an alternative, the ring gear 5 may also internally incorporate a series of elements made of an electrically conductive material which are arranged in such a way as to form a squirrel cage.
- Similarly to the ring gear 5, the gear wheel 6 is also preferably made of a plastic material or of a sintered metallic material.
- With reference to
Figure 1 , it is preferable that the gear pump 1 is finally provided with anouter casing 14, which is equipped on the inside with a structured/shaped cavity for accommodating thestator unit 2, thetubular bush 4 and the two pumping gears 5 and 6 and at the same time closing the two axial ends of thecavity 3, preferably in a fluid-tight manner. - The
support pin 13 of the gear wheel 6 is preferably furthermore fixed firmly on theouter casing 14. - More specifically, in the example shown, the
outer casing 14 preferably comprises: a substantially cylindrical cup-shaped body 15, which is dimensioned so as to be able to accommodate, resting on the bottom thereof, thestator unit 2, thetubular bush 4 and the two pumping gears 5 and 6; and a disc-shaped cover (not shown) positioned so as to close the opening of the cup-shaped body 15, in such a way as to plug the second axial end of thecavity 3. Thesupport pin 13 preferably further extends in a cantilevered manner from the bottom of the cup-shaped body 15, and is preferably formed in one piece with the latter. - The operation of the gear pump 1 can easily be inferred from that described above and does not need to be explained further.
- The method for mounting the gear pump 1 provides for inserting the
tubular bush 4 into thecavity 3 of thestator unit 2, and then injecting directly into thelongitudinal grooves 12 the adhesive needed to immovably fix/block thetubular bush 4 on thepolar heads 9 of thestator unit 2. - Preferably, but not necessarily, the method for assembling the gear pump 1 moreover provides for inserting at least one of the two pumping gears 5, 6 into the
bush 4, before inserting thebush 4 into thecavity 3 of thestator unit 2. - More specifically, the method for assembling the gear pump 1 preferably provides for inserting at least the ring gear 5 into the
bush 4, before inserting thebush 4 into thecavity 3 of thestator unit 2. - The presence of the
longitudinal grooves 12 offers a number of advantages. - Firstly, the
longitudinal grooves 12 make it possible to inject the adhesive more quickly into the interstitial space between thetubular bush 4 and thestator unit 2, speeding up the production process. - Moreover, the
longitudinal grooves 12 make it possible to distribute the adhesive with greater homogeneity in the interstitial space between thetubular bush 4 and thestator unit 2, with all the advantages this involves. - It is lastly clear that modifications and variants can be brought about with respect to the gear pump 1 without thereby departing from the scope of the present invention.
- By way of example, the
tubular bush 4 could be made of bronze and/or the groove or grooves for supplying the adhesive 12 could extend on the cylindrical surface of thepolar head 9, following a preferably substantially helical curved trajectory.
Claims (10)
- Gear pump (1) for pumping liquids, of the type comprising: a stator unit (2), which
is equipped with a substantially cylindrical cavity (3) and is designed to generate a magnetic field rotating on the inside of said cavity (3); a substantially tubular, cylindrical bush (4), which is keyed on the inside of the cavity (3) of the stator unit (2); and at least one pumping gear (5, 6) housed in an axially rotatable manner on the inside of the bush (4);
the gear pump (1) being characterized in that one or more longitudinal grooves (12) are present in the zone of contact between the stator unit (2) and the bush (4), said longitudinal grooves extending in the interstitial space between the bush (4) and the stator unit (2) and being designed to conduct an adhesive inside the interstitial space between the bush (4) and the stator unit (2). - Gear pump according to Claim 1, wherein (1) the longitudinal groove or grooves (12) extends or extend on the inside of the interstitial space between the bush (4) and the stator unit (2), substantially over the entire axial length (f) of the zone of contact.
- Gear pump according to Claim 1 or 2, wherein the longitudinal groove or grooves (12) is or are substantially rectilinear.
- Gear pump according to Claim 1 or 2, wherein the longitudinal groove or grooves (12) follows or follow a substantially helical curved trajectory.
- Gear pump according to any one of the preceding claims, wherein the zone of contact between the stator unit (2) and the bush (4) is provided with a plurality of longitudinal grooves (12) alongside one another.
- Gear pump according to any one of the preceding claims, wherein the stator unit (2) comprises a plurality of polar cores (8), which surround said cavity (3) and are equipped with polar heads (9) which contribute to delimiting/defining the perimeter of said cavity (3); the longitudinal groove or grooves (12) being formed on at least one of said polar heads (9).
- Gear pump according to any one of the preceding claims, wherein the bush (4) is a cylindrical tubular body made of a plastic material.
- Gear pump according to any one of the preceding claims, wherein said at least one pumping gear (5, 6) comprises: a ring gear (5) with inner toothing, which is housed in an axially rotatable manner on the inside of the bush (4); and a gear wheel (6), which is fitted in an axially rotatable manner on a support pin (13) positioned eccentrically on the inside of the ring gear (5) and meshes on the inner toothing of the ring gear (5).
- Method for assembling a gear pump (1) for pumping liquids, of the type comprising: a stator unit (2), which is equipped with a substantially cylindrical cavity (3) and is designed to generate a magnetic field rotating on the inside of said cavity (3); a substantially tubular, cylindrical bush (4), which is keyed on the inside of the cavity (3) of the stator unit (2); and at least one pumping gear (5, 6) housed in an axially rotatable manner on the inside of the bush (4);
the assembly method being characterized in that it comprises the steps of inserting the bush (4) into the cavity (3) of the stator unit (2), and of then injecting an adhesive into the inside of one or more longitudinal grooves (12) extending in the interstitial space between the bush (4) and the stator unit (2). - Method for assembling a gear pump according to Claim 9, wherein the method comprises the step of inserting said at least one pumping gear (5, 6) into the inside of the bush (4), before inserting the bush (4) into the cavity (3) of the stator unit (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUB2015A005909A ITUB20155909A1 (en) | 2015-11-25 | 2015-11-25 | GEAR PUMP |
PCT/EP2016/078301 WO2017089298A1 (en) | 2015-11-25 | 2016-11-21 | Gear pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3380733A1 EP3380733A1 (en) | 2018-10-03 |
EP3380733B1 true EP3380733B1 (en) | 2020-01-08 |
Family
ID=55538409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16800919.9A Active EP3380733B1 (en) | 2015-11-25 | 2016-11-21 | Gear pump |
Country Status (6)
Country | Link |
---|---|
US (1) | US20180347566A1 (en) |
EP (1) | EP3380733B1 (en) |
JP (1) | JP2018535351A (en) |
CN (1) | CN108291538A (en) |
IT (1) | ITUB20155909A1 (en) |
WO (1) | WO2017089298A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11134380B2 (en) | 2016-10-11 | 2021-09-28 | Whitefox Defense Technologies, Inc. | Systems and methods for cyber-physical vehicle management, detection and control |
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JP6278333B2 (en) * | 2013-09-03 | 2018-02-14 | アイシン精機株式会社 | Electric motor |
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2015
- 2015-11-25 IT ITUB2015A005909A patent/ITUB20155909A1/en unknown
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2016
- 2016-11-21 CN CN201680069175.5A patent/CN108291538A/en active Pending
- 2016-11-21 EP EP16800919.9A patent/EP3380733B1/en active Active
- 2016-11-21 WO PCT/EP2016/078301 patent/WO2017089298A1/en active Application Filing
- 2016-11-21 JP JP2018525375A patent/JP2018535351A/en active Pending
- 2016-11-21 US US15/779,101 patent/US20180347566A1/en not_active Abandoned
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JP2018535351A (en) | 2018-11-29 |
EP3380733A1 (en) | 2018-10-03 |
US20180347566A1 (en) | 2018-12-06 |
WO2017089298A1 (en) | 2017-06-01 |
CN108291538A (en) | 2018-07-17 |
ITUB20155909A1 (en) | 2017-05-25 |
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