DE102019102744A1 - Gear pump - Google Patents

Abstract

Gear pump with a pump housing (2) which has a first fluid connection (21) and a second fluid connection (22), a first gear (5) and at least one second gear (4) which are arranged in the pump housing (2) and delivery cells ( 3 '), characterized in that at least one of the gears (5) and / or at least one component (9) connected to one of the gears (5) is at least partially formed from a magnetizable or magnetized composite material.

Description

The invention relates to a gear pump for conveying a fluid in a motor vehicle, with a pump housing which has a first fluid connection and a second fluid connection. A first gearwheel and at least a second gearwheel are arranged in the pump housing and together form delivery cells to deliver a fluid. The first gearwheel and / or the second gearwheel and / or a component connected to the first gearwheel and / or a component connected to the second gearwheel is / are formed from a magnetized composite material.

It is an object of the invention to improve a gear pump.

This object is achieved by the gear pump according to claim 1. Advantageous further developments are disclosed, inter alia, in the claims dependent on claim 1.

The invention relates to a gear pump, with a pump housing, which has a first fluid connection and a second fluid connection, a first gear and at least a second gear, which are arranged in the pump housing and together form delivery cells for conveying a fluid. Optionally, the gear pump has a component firmly connected to the first gear and / or a component firmly connected to the second gear. The component connected to the gearwheel is preferably provided for mounting, centering and / or for rotating the respective gearwheel. Preferably, the component can additionally or alternatively be provided for axial gap compensation and / or for the axial limitation of the feed cells. The component can be formed separately from the gear or in one piece with the gear. The respective gear wheel advantageously forms the component in one piece. “One-piece” is to be understood to mean, in particular, training from the same material and / or in or from one piece, and in particular a joint training or shaping in a manufacturing process, for example in a casting, sintering, 3D printing or spraying process or from a single blank. Components formed in one piece are preferably formed integrally with one another. “Provided” is to be understood to mean, in particular, specially programmed, designed, designed, configured, equipped and / or arranged.

The first gearwheel and / or the second gearwheel and / or the component connected to the first gearwheel and / or the component connected to the second gearwheel are formed from a magnetized composite material. The magnetized composite material preferably has at least one carrier material in which a component material is embedded, the carrier material and / or the component material being magnetized. The carrier material and the component material preferably consist of different materials. The component material is advantageously embedded in the carrier material in the form of plates, disks, layers, coatings, tubes, rods, spheres, particles, powders, fibers, etc. The component material is advantageously at least essentially and particularly advantageously completely surrounded or received by the carrier material, areas of the component material also being able to be exposed on the surface of the composite material.

The magnetized composite material is advantageously a particle composite material. The component material of the particle composite material is preferably embedded in the carrier material in the form of particles and / or in the form of powder. In principle, the magnetized composite material can be a fiber composite material, a rod composite material, a layer composite material or the like.

The magnetized composite material is particularly advantageously formed from a non-magnetized carrier material in which magnetized particles are embedded and / or magnetized powder is embedded. The carrier material is preferably a plastic or a resin, in particular synthetic resin. The magnetized composite material is advantageously a plastic-bonded magnet. The composite material can be produced in particular by compounding.

The plastic can be, for example, a thermoplastic, such as polyamide, polyphenyl sulfide, or nylon, POM, ABS, PU, PP, PE, PTFE, UHMWPE, HDPE, LDPE, PVC, etc. Furthermore, the plastic can also be a thermoset, such as epoxy resin be. The magnetized particles / powder can be, for example, magnetized soft iron particles / soft iron powder or hard ferrite particles / hard ferrite powder. The soft iron can be an unalloyed iron with a high degree of purity, which is sometimes referred to as magnetic iron.

The gear pump is intended to deliver a fluid. The fluid conveyed can be a lubricant and / or coolant or an actuating means. The gear pump is provided for a motor vehicle, which, for example, conveys or provides the fluid for lubricating and / or cooling a drive motor of the motor vehicle or for actuating a transmission of the motor vehicle.

The gear pump can be a switchable pump, i.e. one A pump in which the pumping direction can be reversed so that the first fluid connection can form an inlet which directs the fluid into a pump chamber or the delivery cells of the gear pump, or an outlet through which the fluid exits the pump room or the delivery cells. The same applies to the second fluid connection, which can also form an inlet or an outlet, depending on the direction of rotation of the pump in clockwise or counter-clockwise direction.

The gear pump advantageously has a component connected to the first gear and formed from the magnetized composite material. The component is advantageously formed in one piece with the first gear. The first gearwheel and the component connected to the first gearwheel advantageously consist of the same material. The first gear and the component connected to the first gear are preferably formed in or from one piece. The first gearwheel and the component connected to the first gearwheel are advantageously formed together in a manufacturing process, for example in a casting, sintering or injection molding process or produced / molded from a single blank. The first gear preferably forms the component connected to the first gear. The first gearwheel and the component connected to the first gearwheel are preferably formed entirely from the magnetized composite material.

The component connected to the first gear is preferably designed as a drive element and is thus provided for the electrical rotary drive of the first gear in order to convey fluid in the pump chamber from the suction side to the pressure side. Additionally or alternatively, the component connected to the first gearwheel can be designed as a bearing element for rotationally mounting the first gearwheel and / or as a centering element for centering the first gearwheel.

Furthermore, the gear pump preferably has at least one axial sealing gap and an axial gap compensation device which generates or provides an axially directed magnetic force on the magnetized composite material in order to reduce the axial sealing gap, at least in one operating state. The axial sealing gap is advantageously formed radially between the pump chamber or the delivery cells and a rotary bearing of a gear wheel. The axial sealing gap preferably seals the delivery cells which form the gearwheels with respect to at least one rotary bearing. The axial sealing gap is advantageously formed axially between the pump housing and the first gearwheel, the axially directed magnetic force pushing and / or pulling the first gearwheel axially in the direction of the axial sealing gap. The axial sealing gap is preferably formed on the first gear and is thus axially delimited by the first gear. The axial sealing gap is preferably formed on the pump housing and is thus axially delimited by the pump housing. The axial sealing gap can additionally or alternatively be formed on a plate arranged between the first gear wheel and the pump housing and thus be delimited by the plate. The term “axial” refers in particular to the axis of rotation of the first gear and / or the second gear, so that the term “axial” denotes a direction that runs on or parallel to the axis of rotation. The term “radial” relates in particular to the axis of rotation of the first gear and / or the second gear, so that the term “radial” denotes a direction that is perpendicular to the axis of rotation.

The gear pump can further comprise a magnetic device which generates or provides a magnetic force acting on the magnetized composite material and thus on the first gear and / or the component connected to the first gear. The magnetic device is preferably designed as an electrical coil. The magnet device can be encompassed by the gear pump or connected to the gear pump. The magnet device can be arranged inside the pump housing, or arranged outside the pump housing and connected or connectable to the pump housing.

The magnetic device preferably forms at least partially the axial gap compensation device. The magnetic device or the magnetic field generated or provided by the magnetic device generates or provides the axially directed magnetic force acting on the magnetized composite material, in particular on the component connected to the first gear, to reduce the axial sealing gap, whereby the first gear axially in the direction of axial sealing gap is moved. The component connected to the first gearwheel is preferably designed as a compensation element and is therefore provided for axial gap compensation of the axial sealing gap or the axial sealing gap.

Due to the axial force generated or provided by the magnetic device and acting on the component connected to the first gear, the first gear is pressed or pulled in the direction of the axial sealing gap against the pump housing or the plate, as a result of which the axial sealing gap can be set or reduced. As a result, a uniform axial gap can be set up, which is very stable when the magnetic force acting on the component connected to the first gearwheel. The axial sealing gap is in particular between an end face of the first gearwheel facing the fluid connections and one of the end wall opposite inner wall of the pump housing or the plate is formed.

The magnetic device preferably forms at least partially an electric pump drive. The magnetic device or the magnetic field generated or provided by the magnetic device generates or provides the rotating force acting on the magnetized composite material, in particular on the component connected to the first gear, whereby the first gear is driven to convey the fluid about the axis of rotation.

The component connected to the first gearwheel is preferably connected / coupled or connectable / connectable to the pump drive, in particular to the electrical coil. The gear pump is preferably designed as an electrically driven gear pump.

The magnet device can preferably generate or provide a torque which acts on the component connected to the first gear and which drives the first gear. Preferably, the magnetic device can simultaneously generate the aforementioned axial force with which the axial sealing gap can be reduced.

The magnetic device or the magnetic field generated or provided by the magnetic device preferably acts on the component connected to the first gear. The component connected to the first gear advantageously forms part of the axial gap compensation device and the electric pump drive.

The component connected to the first gear preferably has a bottom of the pump chamber and / or the delivery cells. The bottom is preferably disc-shaped. The bottom is preferably formed in one piece with the component that is firmly connected to the first gear. In particular, the first gear, the bottom and the component connected to the first gear are formed in one piece. The component connected to the first gearwheel is preferably designed as a base element and is therefore provided for axially delimiting the pump chamber and / or the delivery cells.

The gear pump is designed in particular as an internal gear pump. The first gear is preferably designed as an external gear and the second gear as an internal gear. The first gear wheel advantageously has internal teeth and the second gear wheel has external teeth.

The pump housing can be formed at least from a first part or pump housing cover and a second part or pump housing body. The pump housing can also consist of more than the first and the second part, for example the first part, the second part, a third part, a fourth part, etc. In the following only the pump housing cover and the pump housing body will be discussed independently of the total number of pump housing parts.

The pump housing cover can accommodate the gears. Alternatively, the two gear wheels can also be received by the pump housing body or by the pump housing body and the pump housing cover.

The component connected to the first gearwheel can simultaneously form the drive element, the centering element, the bearing element, the compensation element and the base element. In principle, the component connected to the first gearwheel can also form only one of the drive element, centering element, bearing element, compensation element and base element or form at least two of the drive element, centering element, bearing element, compensation element and base element.

The component connected to the first gearwheel can preferably protrude vertically downward from an underside of the first gearwheel facing away from the second gearwheel and can engage, for example, in a recess in the pump housing body. The component connected to the first gearwheel can have an annular design or can consist of a plurality of partial ring segments spaced apart in the circumferential direction of the first gearwheel. The ring or the partial ring segments that form the component connected to the first gearwheel is / are circular, or are circular segments. An axial length of the circular segments can be the same or different, the width of the circular segments in the circumferential direction can be the same or vary, as can a distance between two circular segments that follow one another in the circumferential direction.

The component connected to the first gear wheel engages, for example, in an annular groove, which is preferably formed in or by the pump housing body. The annular groove forms a guide for the component connected to the first gear and advantageously a rotary bearing, in particular if the first gear is the driven gear of the gear pump.

The first gear wheel is advantageously cup-shaped. The first gearwheel and the base preferably together form a cup-shaped pump chamber which is open on one side and into which the second Gear protrudes or is arranged. The first gear and the bottom are advantageously made of the same material. The first gear and the bottom are preferably molded in or out of one piece. The first gearwheel and the base are advantageously formed together in one manufacturing process, for example in a casting, sintering, 3D printing or spraying process or produced / molded from a single blank. Preferably, the first gear forms the bottom integrally.

The bottom and a radially inner peripheral wall of the first gear, which preferably forms the toothing of the first gear, advantageously form or at least partially delimit the pump chamber. The second gearwheel is preferably arranged in the pump chamber, so that the teeth of the second gearwheel together with the teeth of the first gearwheel form the delivery cells for transporting the fluid through the pump chamber.

The first gear wheel is preferably of double-pot shape. The first gear wheel is advantageously pot-shaped on its two axial sides. The first axial side or end face of the first gear forms a first pot space, which is provided for receiving the second gear, and the second axial side or end face of the first gear forms a second pot space, which is used for the rotary drive and / or for the rotary bearing and / or Centering and / or for axial gap compensation is provided. The component connected to the first gear preferably forms the second cup space of the first gear. The base or the base element is advantageously arranged axially between the toothing of the first gear and the drive element and / or the centering element and / or the bearing element and / or the compensation element. The bottom or the bottom element is advantageously arranged axially between the two pot spaces.

The floor or the floor element preferably spatially and / or hydraulically separates the two pot spaces from one another.

The axial gap compensation device can further comprise a magnetically effective plate, which cooperates magnetically with the magnetized composite material, in particular with the first gearwheel, to reduce the axial sealing gap. The magnetized composite material, in particular the first gearwheel, preferably pulls or pushes the magnetically active plate in the direction of the axial sealing gap. Advantageously, the composite material, in particular the first gear, magnetically pulls the plate to reduce the axial sealing gap or magnetically pushes the plate off. Alternatively or additionally, the magnetically active plate pulls or pushes the magnetized composite material, in particular the first gear, in the direction of the axial sealing gap.

The axial sealing gap is preferably formed between the magnetically active plate and the first gear. The magnetically active plate is arranged in the pump housing, preferably in the pump housing cover. The magnetically active plate can be arranged in the pump housing at least in a rotationally fixed, in particular captive, or movable manner. The plate can preferably rotate with the first gear. The magnetically active plate is advantageously designed as a metal plate. The magnetized composite material, in particular the first gearwheel, preferably magnetically attracts the metal plate.

An outer diameter of the magnetically active plate can be substantially as large as an outer diameter of the first gear. The outside diameter of the magnetically active plate can alternatively be larger, less preferably also smaller, than the outside diameter of the first gear. In the fully assembled gear pump, the magnetically active plate preferably forms the axial sealing gap with the end face of the first gear facing away from the floor. The axial sealing gap preferably seals the delivery cells which form the gearwheels with respect to at least one rotary bearing.

The magnetically active plate can have a first opening that fluidly connects the first fluid connection to the pump chamber and a second opening that connects the second fluid connection to the pump chamber. The first opening and the second opening can be shaped identically.

The second gearwheel can comprise a bearing journal which projects essentially perpendicularly from an end face of the second gearwheel facing away from the first gearwheel. The magnetically active plate can comprise a third opening and this third opening, which is formed radially between the first opening and the second opening in the magnetically active plate, can be penetrated by the bearing pin of the second gear. In this case, a diameter of the third opening can essentially correspond to an outer diameter of the bearing journal.

The second gear wheel can have an axial through opening or through bore. The floor can also have an opening or through opening. If the second gearwheel and the base each have the through opening, the through openings can at least partially overlap.

A circumferential groove can be formed in an axial inner wall of the pump housing cover, which lies opposite an end face of the first gearwheel facing the pump housing cover. The groove preferably interrupts the axial sealing gap. This groove has a width in the radial direction that is smaller than a width of the first gear. The width of the groove is preferably smaller than a distance between a radial outer wall of the first gearwheel and the tooth feet of the teeth of the first gearwheel, so that the groove does not extend into the interdental spaces of the ring gear of the first gearwheel. The groove in the pump housing can be formed in a radially outer region of the inner wall, for example of the housing cover, and can extend radially in the direction of an axis of rotation of the gear pump or the axis of rotation of the gears. The groove serves in particular to reduce a contact area between the end wall of the first gear and the inside of the pump housing.

The second gear of the gear pump can comprise a first axis of rotation or central axis. The first gear of the gear pump can comprise a second axis of rotation or a central axis. The first axis of rotation and the second axis of rotation can run parallel to one another at a distance from one another.

Finally, the gear pump can comprise a lubricant feed, which guides a lubricant from the fluid connection designed as an outlet through one or more rotary bearings to the fluid connection designed as an inlet. The lubricant can in particular be the fluid delivered by the gear pump, for example an oil, lubricating oil, lubricant, coolant, cooling water, etc. The lubricant guide defines a lubricant path that, in a first direction of rotation of the gear pump, from the first fluid connection to the second Fluid connection leads, and in a second direction of rotation of the gear pump from the second fluid connection to the first fluid connection.

The through openings in the second gear and in the bottom form parts of the lubricant supply or the lubricant path, regardless of the direction of rotation of the gear pump. Other parts form grooves in the pump housing in the first gear, the second gear and any inner sides of the pump housing facing the centering. The base and / or the magnetically active plate can also have one or more grooves which form parts of the lubricant supply.

Rotary bearings for the first gear, the second gear and the centering can be formed in the pump housing. Thus, a rotary bearing for the second gear can be formed by an outer peripheral surface of the pin on the second gear and an inner wall of the pump housing opposite the pin. A rotary bearing can be formed by a radial outside of the first gear and an inner wall of the pump housing opposite the radial outside. A rotary bearing can be formed by a radial inside and / or outside of the component connected to the first gear and at least one inside wall of the pump housing opposite the inside or outside.

The gear pump can also form one or more axial gaps. An axial gap can be formed by an end face of the first gearwheel facing the first and second fluid connection and an inner wall of the pump housing opposite the end face. An axial gap can be formed by an end face of the second gear wheel facing away from the first and second fluid connection and an inner wall of the pump housing opposite the end face. An axial gap can be formed between a surface of the base facing away from the second gearwheel and an inner wall of the pump housing opposite the surface. The axial gaps can form axial sealing gaps.

An axial gap, in particular an axial sealing gap, in the gear pump with the magnetically active plate can be formed by the upper side of the magnetically active plate facing the first and second gear and the end face of the first and second gear facing the magnetically active plate, the magnetized composite material , in particular the first gear, which attracts the magnetically active plate and can thereby move the magnetically active plate linearly relative to the first gear in the axial direction, which can bring about axial adjustment or axial gap compensation of one or more of the axial gaps.

The magnetized or magnetizable composite material can be or become magnetized in such a way that by the pump drive, in particular the electrical coil, the first gearwheel, which consists at least in regions of the composite material, and / or the component connected to the first gearwheel, which at least in regions consists of the composite material, can be driven in rotation. Depending on the energization of the pump drive, in particular the coil, the first gear and / or the component connected to the first gear can be driven in a first direction of rotation or in a second direction of rotation.

Furthermore, the magnetized or magnetizable composite material can be magnetized in such a way that by the pump drive, in particular the electrical coil, the first gearwheel, which consists at least in regions of the composite material, and / or the component connected to the first gearwheel, which at least in regions the composite material, is pressed or pulled axially against the axial sealing gap (s), whereby a magnetic axial compensation of the sealing gap takes place. The magnetic axial compensation can also be set using permanent magnets. For this purpose, the axial gap compensation device can have one or more permanent magnets.

In addition, the magnetized or magnetizable composite material can be magnetized in such a way that by the pump drive, in particular the electrical coil, the first gearwheel, which consists at least in regions of the composite material, and / or the component connected to the first gearwheel, which at least in regions the composite material, are magnetically centered to each other and / or to the pump housing. Magnetic centering can also be set using permanent magnets.

The first gear is preferably in one piece. The first gear wheel advantageously has an internal toothing and a radial outer surface for forming a rotary bearing. Particularly advantageously, the first gear additionally includes the floor or the floor element and / or the drive element and / or the bearing element and / or the centering element and / or the compensation element. The second gear is preferably in one piece. The second gear wheel advantageously has external teeth and a radial external surface for forming a rotary bearing.

Advantageous features of the subject matter of the application are presented below in the form of aspects, the aspects being formulated in the form of claims. The aspects belong to the scope of the invention and can be used to advantageously develop the subject matter of the application. In addition, the aspects include features that can be used to pursue further inventions contained in the description in divisional applications.

Aspect # 1: Gear pump with a pump housing ( 2nd ), which has a first fluid connection ( 21 ) and a second fluid connection ( 22 ) with a first gear ( 5 ) and at least one second gear ( 4th ), which are provided for conveying a fluid and are arranged in the pump housing.

Aspect # 2: Gear pump according to aspect # 1, characterized by a drive element which is connected to the first gearwheel for rotary drive, the drive element and / or the first gearwheel being formed at least partially from a magnetizable or magnetized composite material.

Aspect # 3: Gear pump according to Aspect # 2, wherein the composite material is formed from a carrier material in which magnetizable or magnetized particles and / or magnetizable or magnetized powder are / is embedded.

Aspect # 4: Gear pump according to Aspect # 3, wherein the carrier material is a thermoplastic or an elastomer or a resin, in particular synthetic resin.

Aspect # 5: Gear pump according to aspect # 3 or 4, the particles being designed as soft iron particles or hard ferrite particles.

Aspect # 6: Gear pump according to one of the aspects # 2 to # 5, the first gear and the drive element being formed in one piece from the composite material.

Aspect # 7: Gear pump at least according to Aspect # 2, characterized by a magnetic device that generates a magnetic force acting on the drive element.

Aspect # 8: Gear pump according to Aspect # 7, wherein the pump housing and the first gear form at least one axial sealing gap and the magnetic device generates or provides an axial force acting on the first gear and / or the drive element, which forces the first gear in the direction of the axial sealing gap pushes or pulls against the pump housing.

Aspect # 9: Gear pump according to Aspect # 7 or 8, wherein the magnetic device generates a rotating force acting on the drive element, which drives the first gear wheel to convey the fluid.

Aspect # 10: Gear pump according to Aspect # 7, 8 or 9, wherein the magnetic device is an electrical coil.

Aspect # 11: Gear pump according to one of the preceding Aspects #, characterized by training as an internal gear pump.

Aspect # 12: Gear pump according to one of the preceding Aspects #, wherein the first gear is designed as an external gear and the second gear as an internal gear.

Aspect # 13: Gear pump according to one of the preceding Aspects #, wherein the pump housing is formed from a first part or pump housing cover and a second part or pump housing body.

Aspect # 14: Gear pump according to aspect # 13, wherein the pump housing cover receives the first gear and the second gear.

Aspect # 15: Gear pump according to one of the preceding Aspects #, wherein the first gear comprises a centering element.

Aspect # 16: Gear pump according to aspect # 15, the centering element preferably projecting vertically downward from an underside of the first gear which faces away from the second gear.

Aspect # 17: Gear pump according to aspect # 15 or 16, wherein the centering element is circular or consists of a plurality of partial circle segments spaced apart in the circumferential direction of the first gear.

Aspect # 18: Gear pump according to one of the aspects # 15, 16, 17, wherein the centering element is mounted in the pump housing body.

Aspect # 19: Gear pump at least according to aspect # 15, wherein the first gear and the centering element are firmly connected to one another.

Aspect # 20: Gear pump at least according to aspect # 15, wherein the first gear and the centering element are formed in one piece from the composite material.

Aspect # 21: Gear pump according to one of the preceding Aspects #, characterized by a base which is fixedly connected to the first gear, the base preferably being arranged between the first gear and the drive element and / or between the first gear and the centering element.

Aspect # 22: Gear pump according to aspect # 21, wherein the first gear, the bottom and the centering element are firmly connected to one another.

Aspect # 23: Gear pump according to Aspect # 21 or 22, wherein the first gear, the bottom and the centering element are formed in one piece from the composite material.

Aspect # 24: Gear pump according to Aspect # 21, 22 or 23, wherein the first gear, the bottom, the centering element and the drive element are formed in one piece from the composite material.

Aspect # 25: Gear pump according to one of the preceding Aspects #, the first gear being cup-shaped, in particular double-pot-shaped.

Aspect # 26: Gear pump at least according to aspect # 21, wherein the bottom forms a bottom of the first gear.

Aspect # 27: Gear pump according to one of the preceding Aspects #, wherein the gear pump comprises a magnetically active plate, in particular a metal plate.

Aspect # 28: Gear pump at least according to Aspects # 13 and 27, the plate being arranged in the pump housing cover.

Aspect # 29: Gear pump at least according to Aspects # 13 and 27, the plate being connected to the pump housing cover in a rotationally fixed or rotatable manner.

Aspect # 30: Gear pump at least according to aspect # 27, wherein the plate has an outer diameter that is at least substantially as large as an outer diameter of the first gear.

Aspect # 31: Gear pump at least according to aspect # 27, wherein the plate or an axial sealing gap formed by the plate seals an end face of the first gear wheel facing away from the floor.

Aspect # 32: Gear pump at least according to Aspect # 27, wherein the plate seals delivery cells, which form the first gear and the second gear in the pump chamber, with respect to the housing, in particular with respect to at least one rotary bearing.

Aspect # 33: Gear pump at least according to Aspect # 27, wherein the plate has a first opening that fluidly connects the first fluid connection to the pump chamber and a second opening that fluidly connects the second fluid connection to the pump chamber.

Aspect # 34: Gear pump according to Aspect # 33, wherein the first opening and the second opening are shaped identically.

Aspect # 35: Gear pump according to one of the preceding Aspects #, wherein the second gear comprises a bearing journal which projects at least substantially perpendicularly from an end face of the second gear facing away from the first gear.

Aspect # 36: gear pump at least according to Aspect # 33, wherein the plate comprises a third opening.

Aspect # 37: Gear pump according to aspect # 36, wherein the third opening is formed radially between the first opening and the second opening in the plate.

Aspect # 38: Gear pump according to Aspect # 36 or 37, wherein the bearing pin of the second gear protrudes through the third opening in the plate.

Aspect # 39: Gear pump at least according to Aspect # 36, wherein a diameter of the third opening corresponds at least essentially to an outer diameter of the bearing journal.

Aspect # 40: Gear pump according to one of the preceding Aspects #, wherein the second gear has an axial through opening.

Aspect # 41: Gear pump at least according to Aspect # 21, wherein the bottom has an opening.

Aspect # 42: Gear pump according to Aspects # 40 and 41, wherein the through opening in the second gear and the opening in the bottom at least partially overlap.

Aspect # 43: Gear pump at least according to aspect # 13 or 27, wherein in an inner wall of the pump housing cover, preferably that which is opposite an end face of the first gearwheel facing the pump housing cover, and / or in an inner wall of the plate, preferably that end face of the first which faces the plate Gear is opposite, at least one pocket, preferably a circumferential groove, is formed to reduce friction.

Aspect # 44: Gear pump according to Aspect # 43, wherein the pocket has a width in the radial direction that is smaller than a width of the first gear.

Aspect # 45: Gear pump according to Aspect # 43 or 44, wherein the pocket is formed in a radially outer region of the inner wall and extends radially in the direction of an axis of rotation of the gear pump.

Aspect # 46: Gear pump according to one of the preceding Aspects #, wherein the gear pump is provided for a forward and a reverse operation.

Aspect # 47: Gear pump according to one of the preceding Aspects #, characterized by a lubricant supply which sets a fluid flow between the fluid connections through two rotary bearings of the gear pump in a first direction of rotation and in a second direction of rotation opposite to the first direction of rotation.

Aspect # 48: Gear pump at least according to Aspects # 40, 41, 47, wherein the through opening in the second gear and the opening in the bottom at least partially form the lubricant supply.

Aspect # 49: Gear pump according to Aspect # 47, characterized by at least one groove in the pump housing and / or in the base, which at least partially form the lubricant supply.

Aspect # 50: Gear pump at least according to aspect # 47, wherein a rotary bearing is formed by an outer peripheral surface of the bearing journal on the second gear wheel and an inner wall of the pump housing opposite the bearing journal.

Aspect # 51: Gear pump at least according to Aspect # 47, wherein a rotary bearing is formed by a radial outside of the first gear and an inner wall of the pump housing opposite the radial outside.

Aspect # 52: Gear pump at least according to Aspect # 47, wherein a rotary bearing is formed by a radial inside and / or outside of the centering element and / or the drive element and an inner wall of the pump housing opposite the inside and / or outside.

Aspect # 53: Gear pump according to one of the preceding Aspects #, the gear pump having one or more axial gaps, in particular sealing gaps.

Aspect # 54: Gear pump according to aspect # 53, wherein an axial gap is formed by an end face of the first gearwheel facing the first and second fluid connection and an inner wall of the pump housing opposite the end face or an inner wall of the plate opposite the end face.

Aspect # 55: Gear pump according to aspect # 53 or 54, wherein an axial gap is formed by an end face of the first gear wheel facing away from the first and second fluid connection and an inner wall of the pump housing opposite the end face or an inner wall of the plate opposite the end face.

Aspect # 56: Gear pump according to aspect # 53, 54 or 55, wherein an axial gap between a surface of the Bottom and an inner wall of the pump housing opposite the surface is formed.

Aspect # 57: Gear pump at least according to Aspect # 2 and 27, wherein the first gear attracts the plate and thereby causes axial gap compensation.

Aspect # 58: Gear pump according to one of the preceding Aspects #, characterized by at least one axial sealing gap and a magnetic axial gap compensation device which generates an axially directed magnetic force to reduce the axial sealing gap.

Aspect # 59: Gear pump according to Aspect # 58, wherein the axially directed magnetic force pulls and / or pushes at least the first gear in the direction of the axial sealing gap.

Aspect # 60: Gear pump according to Aspect # 58 or 59, wherein the axial gap compensation device has at least one magnetizable or magnetized component which is fixedly connected to the first gear and / or is formed in one piece with the first gear.

Aspect # 61: Gear pump according to aspect # 60, wherein the component is a permanent magnet which is fixedly arranged on or in the first gear.

Aspect # 62: Gear pump according to aspect # 60, wherein the component is a magnetizable or magnetized composite material, which is fixedly arranged on or in the first gear or is formed in one piece with the first gear.

Aspect # 63: Gear pump at least according to Aspect # 60, wherein the axial gap compensation device has a magnetic device that generates or provides an axially directed magnetic force that presses and / or pulls the first gear and / or the component in the direction of the axial sealing gap.

Aspect # 64: Gear pump according to Aspect # 63, wherein the magnet device has at least one electrical coil and / or at least one permanent magnet and / or at least one component formed from a magnetized composite material.

Aspect # 65: Gear pump according to Aspect # 64, the electrical coil being provided in addition to the rotary drive of the first gear.

Aspect # 66: gear pump at least according to aspect # 58, wherein the axial gap compensation device has at least one metal plate which is magnetically attracted by the first gear and / or the component.

Exemplary embodiments of a gear pump according to the invention are explained in more detail below with reference to figures, without the scope of the invention being restricted to what is shown. Features essential to the invention, which can only be seen from the figures, count towards the disclosure of the application and can advantageously individually and in combinations further develop the subject of the application.

• 1: eine Zahnradpumpe in einem ersten Ausführungsbeispiel
• 2: eine Zahnradpumpe in einem zweiten Ausführungsbeispiel

The figures show in detail:

• 1 : a gear pump in a first embodiment
• 2nd : a gear pump in a second embodiment

The 1 shows a first embodiment of a gear pump 1 according to the invention. The gear pump 1 comprises a first fluid connection 21 and a second fluid port 22 . With the gear pump 1 it is a switchable gear pump that can be driven in a first direction of rotation or in a second direction of rotation, which is directed opposite to the first direction of rotation. The gear pump 1 is intended for forward operation and reverse operation. Depending on the direction of rotation of the pump, the first fluid connection is 21 a fluid inlet or a fluid outlet. The second fluid port 22 accordingly forms the fluid outlet or the fluid inlet of the gear pump 1 .

From the fluid inlet to the pump 1 a fluid passes through a pump chamber inlet into a pump chamber 3rd and leaves the pump room 3rd through a pump chamber outlet that is fluid with the fluid outlet, that is, depending on the direction of rotation with the first fluid connection 21 or the second fluid connection 22 connected is.

The gear pump 1 includes a pump housing or housing 2nd , with a housing cover 23 and a housing body 24th . The housing cover 23 has the first fluid connection 21 and the second fluid connection 22 on. In the housing cover 23 are a first gear or an external gear 5 and a second gear or internal gear 4th arranged. The external gear 5 is connected to a pump drive or can be connected or coupled or coupled. Basically, it is conceivable that the internal gear 4th is connected / connectable or coupled / coupled to the pump drive.

The external gear 5 is double-pot-shaped. The external gear 5 has a pot space on both ends. In the first Pot space is the internal gear 4th arranged. The housing body protrudes into the second pot space 24th inside. The housing body 24th assigns a shot 25th that protrudes axially into the second pot space.

The external gear 5 forms a single part 9 that fulfills several functions. The component 9 is in this embodiment for rotary drive or for connection / coupling to the pump drive, for rotary mounting, for centering, for axial gap compensation and for the axial limitation of the pump chamber 3rd and thus the production cells 3 ' intended. The component 9 forms a drive element, a centering element, a bearing element, a compensation element and a base. Basically, the component 9 be provided only for a part of the functions or only for one of the functions. In this embodiment, the component is 9 executed as a multi-function component.

The component 9 surrounds the second pot space of the external gear 5 and the recording 25th of the housing body 24th . It is on the recording 25th arranged. The component 9 is ring-shaped. It protrudes in a ring from the lower end face of the external gear 5 and extends parallel to the axis of rotation of the external gear 5 . The component 9 forms a bottom 8th that the pump room 3rd and with it the production cells 3 ' axially limited. The floor 8th is disc-shaped. The floor 8th forms an axial end wall of the pump chamber 3rd . The external gear 5 forms together with the housing 2nd , respectively the housing cover 23 , the pump room 3rd .

In the pump room 3rd is the internal gear 4th arranged with an axis of rotation of the internal gear 4th and an axis of rotation of the external gear 5 run parallel to each other, but do not coincide. The internal gear 4th is in the pump room 3rd eccentrically stored. External gear 5 and internal gear 4th are in engagement with each other and form funding cells 3 ' which transport the fluid from the pump chamber inlet to the pump chamber outlet and thus from the fluid inlet to the fluid outlet. Due to the eccentric arrangement of the internal gear 4th to the external gear 5 change the cells 3 ' doing so their volume so that when the fluid is transported through the pump room 3rd there is an increase in pressure in the fluid.

The internal gear 4th has a central through opening 42 , in the ground 8th of the external gear 5 is a through opening 54 educated. It is also in the housing cover 23 an essentially circumferential groove 7 formed, with the external gear 5 in the area of the groove 7 with an upper end face cannot rest against an inner wall of the housing, so that in this area there are no adhesive or frictional forces between the external gear 5 and the housing cover 23 may occur.

The gear pump has a pump drive 1 an electric magnetic device 6 on. The magnetic device 6 has a coil that generates or provides a magnetic field when energized. The magnetic field acts on the component 9 . For this purpose, the magnetic device surrounds 6 the component 9 . The gear pump 1 is designed as an electric gear pump. The magnetic device 6 is on the outside of the housing body 24th arranged.

The external gear 5 is made of a magnetized composite material. This is also the component 9 formed from the magnetized composite. The composite material consists of a non-magnetic carrier material, in this exemplary embodiment a plastic in which magnetized particles, for example soft iron particles, are embedded. The external gear 5 is made of a magnetized plastic. The proportion, shape and distribution of the magnetized particles in the carrier material allow the magnetic and electrical properties to be specifically set. The composite material and thus the external gear 5 or at least the component 9 are magnetized in the way that by interacting with the magnet device 6 the rotary drive and / or the axial gap compensation takes place. The external gear 5 is formed by a plastic bonded magnet.

The external gear 5 or at least the component 9 is magnetized in the way that by the magnetic device 6 or that through the magnetic device 6 generated magnetic field the external gear 5 is driven by rotation. Depending on the energization of the magnetic device 6 becomes the external gear 5 driven in the first direction of rotation or in the second direction of rotation. The magnetic device 6 generates a magnetic field or a rotational force on the component formed by the magnetized composite 9 works. The magnetized component 9 thereby forms a drive element over which the external gear 5 is driven. The magnetic device 6 and the component 9 form the pump drive.

Furthermore, the external gear 5 or at least the component 9 magnetized in the way that through the magnetic device 6 or that through the magnetic device 6 generated magnetic field the external gear 5 axially against at least one axial sealing gap S1 in the gear pump 1 is pushed or pushed. The magnetic device 6 generates a magnetic field or an axial force on the component formed by the magnetized composite 9 works. The magnetized component 9 thereby forms a compensation element over which the external gear 5 for axial gap compensation axially at least against the sealing gap S1 or towards the Sealing gap S1 is pushed or pushed. The magnetic device 6 created on the component 9 a magnetic field or an axial force affecting the external gear 5 axially against the housing 2nd and in this embodiment against the housing cover 23 presses. The magnetic device 6 and the component 9 form a magnetic axial gap compensation device for reducing at least the axial sealing gap S1 .

The axial sealing gap S1 is between one of the external gear 5 facing inside of the housing cover 23 and one the housing cover 23 facing end face of the external gear 5 educated. Due to the magnetization, the external gear 5 axially in the direction of the housing cover 23 pressed, causing an adjustment of the axial width of the sealing gap S1 and / or an axial compensation of the sealing gap S1 he follows. The gear pump 1 has further axial sealing gaps S2 , S3 on. The axial sealing gap S2 is between one of the internal gear 4th facing inside of the housing cover 23 and one the housing cover 23 facing end face of the internal gear 4th educated. The axial sealing gap S3 is between one of the internal gear 4th facing inside of the floor 8th and one to the external gear 5 facing end face of the internal gear 4th educated. The magnetic force of the magnetic device 6 pushes the external gear 5 axially also in the direction of the sealing gap S2 , S3 , which also provides axial gap compensation for the sealing gaps S2 , S3 can take place or takes place.

In addition, the external gear 5 or at least the component 9 magnetized in the way that through the magnetic device 6 or that through the magnetic device 6 generated magnetic field the external gear 5 to the pump housing 2nd and / or to the internal gear 4th is magnetically centered or aligned. The magnetic device 6 generates a magnetic field or centering force on the component formed by the magnetized composite 9 works. The magnetized component 9 thereby forms a centering element over which the external gear 5 is centered. The magnetic device 6 and the component 9 form a magnetic centering device.

The gear pump 1 also includes a lubricant supply that is independent of the direction of rotation of the gear pump 1 adjusts a fluid flow through a lubricant, preferably the fluid to be pumped, through three axial rotary bearings D1 , D2 , D3 directs. The first pivot bearing is stored D1 the internal gear 4th and the second pivot bearing D2 and third pivot bearing D3 the external gear 5 . The first pivot bearing D1 is through a radial outside of the internal gear 4th , or a radial outside of one of the internal gear 4th axially protruding guide pin 43 , and an inner surface opposite the radial outside of the housing cover 23 educated. The second pivot bearing D2 is by a radial outside of the external gear 5 and an inner surface of the housing cover opposite the radial outside 23 educated. The third pivot bearing D3 is through the component 9 and the recording 25th that in the component 9 reaches in, formed. The component 9 thereby forms a bearing element. The lubricant supply has the through opening 42 , the through opening 54 and a plurality of lubricant guide grooves, which are used for the targeted guidance of the fluid in the axial sealing gaps S1 , S2 , S3 and / or in radial sealing gaps or the pivot bearings D1 , D2 , D3 are introduced.

The gear pump 1' the second figure essentially corresponds to the gear pump 1 of the 1 . In contrast to the previous exemplary embodiment, the axial gap compensation device has a magnetically active plate 12th on, magnetically with the outer gear formed from the magnetized composite 5 cooperates. The magnetically effective plate 12th is axial between the housing 2nd in this embodiment, the housing cover 23 and the gears 4th , 5 arranged. The plate 12th contacts the housing directly 2nd / the housing cover 23 and the gears 4th , 5 . The first sealing gap S1 is thus between the plate 12th and the external gear 5 and the second sealing gap S2 between the plate 12th and the internal gear 4th educated. The plate 12th is firmly attached to the housing cover 23 connected. Basically, the plate 12th also loose and therefore rotatable and displaceable in the housing 2nd be arranged.

The magnetically effective plate 12th alternatively or in addition to the component 9 a compensation element made for axial gap compensation of the axial sealing gap S1 , S2 , S3 is provided. The external gear formed from the magnetized composite 5 pulls the plate 12th magnetically. The external gear 5 pulls the plate 12th axially against the sealing gap S1 , S2 or in the direction of the sealing gap S1 , S2 . Especially when the plate 12th firmly with the housing 2nd is connected, the external gear 5 through the plate 12th get dressed by. This pulls the plate 12th the external gear 5 axially into the sealing gap S1 , S2 or in the direction of the sealing gap S1 , S2 . The plate 12th has passages or openings through which the fluid connections 21 , 22 with the pump room 3rd connect. The plate 12th is designed as a metal plate. The plate 12th can also be designed as a magnetic plate, the external gear 5 attracts or repels for axial gap compensation. Furthermore, it is basically conceivable that the housing 2nd is formed at least in regions from a magnetically active material and magnetically with the composite material, in particular the external gear, for axial gap compensation 5 , cooperates.

Claims (15)

Gear pump with a pump housing (2) which has a first fluid connection (21) and a second fluid connection (22), a first gear (5) and at least a second gear (4) which are arranged in the pump housing (2) and delivery cells (3 '), characterized in that at least one of the gearwheels (5) and / or at least one component (9) connected to one of the gearwheels (5) is at least partially formed from a magnetizable or magnetized composite material. Gear pump after Claim 1 , wherein the composite material is a plastic bonded magnet. Gear pump after Claim 1 or 2nd , wherein the composite material is formed from a carrier material in which magnetized particles are embedded. Gear pump according to one of the preceding claims, characterized by a component (9) which is connected to the first gear (5) and is made of the composite material and which is used for the electrical rotary drive as a drive element and / or for centering as a centering element and / or for the rotary bearing Bearing element and / or for axial gap compensation as a compensation element and / or for axially delimiting the conveyor cells (3 ') is designed as a base element. Gear pump after Claim 4 , wherein the first gear (5) and the component (9) are formed in one piece from the composite material. Gear pump according to one of the preceding claims, characterized by at least one axial sealing gap (S1) and a magnetic axial gap compensation device which generates or provides an axially directed magnetic force acting on the composite material to reduce the axial sealing gap (S1). Gear pump after Claim 6 , wherein the axial sealing gap (S1) is formed on the first gear (5), the magnetic force pushing and / or pulling the first gear (5) axially in the direction of the axial sealing gap (S1). Gear pump according to one of the preceding claims, characterized by a magnetic device (6) which generates or provides a magnetic force acting on the composite material. Gear pump after Claim 8 , wherein the magnetic device (6), at least in one operating state, generates or provides an axial force acting on the composite material that presses and / or pulls the first gearwheel (5) in the axial direction. Gear pump after Claim 8 or 9 , wherein the magnetic device (6) generates or provides, at least in one operating state, a torque which acts on the composite material and which drives the first gearwheel (5) in rotation. Gear pump after Claim 8 , 9 or 10th The magnetic device (6) generates or provides a centering force acting on the composite material, which centers the first gear (5), at least in one operating state. Gear pump at least after Claim 8 , wherein the magnetic device (6) is an electrical coil. Gear pump at least after Claim 6 , characterized in that the axial gap compensation device has at least one magnetically effective plate (12), the composite material magnetically attracting or repelling the plate (12) to reduce the axial sealing gap (S1). Gear pump after Claim 13 , characterized in that the axial sealing gap (S1) is formed axially between the plate (12) and the first gear (5), the first gear (5) magnetically attracting the plate (12). Gear pump according to one of the preceding claims, characterized by a design as an internal gear pump (1, 1 ').

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