WO2022111757A1 - Gear pump - Google Patents
Gear pump Download PDFInfo
- Publication number
- WO2022111757A1 WO2022111757A1 PCT/DE2021/100907 DE2021100907W WO2022111757A1 WO 2022111757 A1 WO2022111757 A1 WO 2022111757A1 DE 2021100907 W DE2021100907 W DE 2021100907W WO 2022111757 A1 WO2022111757 A1 WO 2022111757A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- pinion
- pump housing
- housing
- pressure side
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
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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
- 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
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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
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0023—Axial sealings for working fluid
- F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
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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
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
-
- 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
Definitions
- the present invention relates to a gear pump, in particular for an electrically operable drive train of a motor vehicle, comprising a drive shaft which can be driven by an electric motor and a first pump pinion which is coupled to the drive shaft in a torque-transmitting manner and is rotatably mounted in a first pump housing, wherein the first pump pinion meshes with a second pump pinion, which is rotatably mounted with a pump shaft in the first pump housing, in such a way that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side, the axes of rotation of the first pump pinion and the second pump pinion running parallel to one another , and the pump shaft is gearedly coupled to the drive shaft in a torque-transmitting manner.
- Gear pumps are basically already known from the prior art. Gear pumps of this type generally have two meshing gear wheels, also referred to as pump pinions, which are rotatably mounted within a pump housing by a drive shaft and a bearing journal. Together with a pump inlet and a pump outlet, the gear wheels form a delivery channel system within the pump housing in order to deliver a fluid.
- gear wheels also referred to as pump pinions, which are rotatably mounted within a pump housing by a drive shaft and a bearing journal. Together with a pump inlet and a pump outlet, the gear wheels form a delivery channel system within the pump housing in order to deliver a fluid.
- gear pumps A possible area of application for such gear pumps is the delivery of hydraulic oil within a motor vehicle.
- internal combustion engines in motor vehicles are equipped with a lubricating oil pump that constantly pumps oil from the oil sump to the bearing points of the engine.
- gear pumps Another well-known application of gear pumps is found in vehicle transmissions that require a separate transmission oil pump.
- An electric axle drive train of a motor vehicle usually includes an electric machine and a Transmission, the electric machine and the transmission form a structural unit. In such configurations, both the electric machine and the transmission require hydraulic cooling and/or hydraulic actuators, for example for a gear change in the transmission.
- a gear pump in particular for an electrically operable drive train of a motor vehicle, comprising a drive shaft which can be driven by an electric motor and a first pump pinion which is coupled to the drive shaft in a torque-transmitting manner and is rotatably mounted in a first pump housing.
- the first pump pinion meshes with a second pump pinion, which is rotatably mounted with a pump shaft in the first pump housing, in such a way that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side, the axes of rotation of the first pump pinion and the second pump pinion being parallel to one another run, and the pump shaft is geared torque-transmitting coupled to the drive shaft, wherein the gear pump has a second pump housing which is fixed to the first pump housing and the pump shaft torque-transmitting with a third , is coupled in the second pump housing rotatably mounted third pump pinion, which is in engagement with a fourth pump pinion rotatably mounted in the second pump housing such that a second fluid can be conveyed from a second low-pressure side to a second high-pressure side.
- the gear pump according to the invention which can also be referred to as a tandem gear pump
- the first and second pump gears define a first pump half
- the third and fourth pump gears define a second pump half
- these two pump halves are connected in series.
- the electric motor and the directly driven first are located Pump pinion in the same half of the housing.
- the drive torque is then transmitted to the second pump half in the second pump housing via the pump shaft, which in turn is driven by the second pump pinion of the gear pump in the first half of the housing.
- the two halves of the pump housing are centered using the same pump shaft.
- the gear pump is a machine for pumping fluids.
- the gear pump is preferably configured as an external gear pump, in which the fluid to be pumped is transported in pump chambers between the teeth of two pump pinions, which are in engagement and are designed as spur gears, and the pump housing.
- the gear pump it is also possible to design the gear pump as a screw pump, in which the pump pinions that are in engagement are designed as spindle screws.
- motor vehicles are land vehicles that are moved by machine power without being tied to railroad tracks.
- a motor vehicle can be selected, for example, from the group of passenger cars (cars), trucks (lorries), mopeds, light motor vehicles, motorcycles, buses (COM) or tractors.
- the drive train of a motor vehicle is understood to mean all components that generate the power for driving the motor vehicle in the motor vehicle and transmit it to the road via the vehicle wheels.
- the axis of rotation of the drive shaft runs coaxially to the axis of rotation of the fourth pump pinion, which supports the compact design of the gear pump.
- the axis of rotation of the second pump pinion and the axis of rotation of the third pump pinion run coaxially, which also promotes a compact design of the gear pump.
- hydraulic channels are formed in the first pump housing, which connect the first low-pressure side and the first high-pressure side of the geared engagement of the first pump pinion with the second pump pinion with hydraulic connections on the first pump housing .
- the invention can also be further developed such that an Oldham coupling is provided in the torque flow between the drive shaft and the first pump pinion, so that a radial offset of the drive shaft and the pump pinion can be compensated for in relation to one another.
- the pump shaft is mounted in the first pump housing by means of a first plain bearing and in the second pump housing by means of a second plain bearing, which also promotes a compact design.
- the fourth pump pinion is mounted by means of a third slide bearing on a bolt that is fixed relative to the second pump housing.
- the compact structure can be further improved in that the invention is also advantageously implemented such that the rotor of the electric motor is arranged coaxially to the drive shaft.
- a roller bearing for supporting the drive shaft is arranged in the first pump housing.
- FIG. 1 shows a gear pump in a schematic cross-sectional view
- Figure 2 two sectional views through different levels of the gear pump in a schematic representation
- FIG. 3 shows a motor vehicle with an electric drive train and a gear pump installed therein in a schematic block diagram.
- the figure shows a gear pump 1 for an electrically operable drive train 2 of a motor vehicle 3, as shown by way of example in FIG.
- the gear pump 1 comprises a drive shaft 4, which can be driven by an electric motor 5, and a first pump pinion 6, which is coupled to the drive shaft 4 in a torque-transmitting manner and is rotatably mounted in a first pump housing 7.
- a roller bearing 18 for supporting the drive shaft 4 is arranged in the first pump housing 7 .
- the rotor 19 of the electric motor 5 is arranged coaxially to the drive shaft 4 .
- the first pump pinion 6 meshes with a second pump pinion 9 rotatably mounted in the first pump housing 7 with a pump shaft 8 such that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side.
- a first fluid can be conveyed from a first low-pressure side to a first high-pressure side.
- Hydraulic channels are formed in the first pump housing 7 and connect the first low-pressure side and the first high-pressure side of the geared engagement of the first pump pinion 6 with the second pump pinion 9 with hydraulic connections on the first pump housing 7 .
- this sectional view also shows the basic functioning of a gear pump 1 in which the two pump pinions 6 , 9 are arranged in the first pump housing 7 so that they can rotate. A fluid is then divided by the rotation of the engaged impellers 6.9 into two partial flows which flow between the impellers 6.9 and the first pump housing 7 in the respective direction of rotation of the impellers 6.9. The fluid thus flows from the first pump inlet 27 to the first pump outlet 29.
- the pump shaft 8 is rotatably supported in the first pump housing 7 and the second pump housing 10 .
- the Pump shaft 8 is mounted in the first pump housing 7 by means of a first slide bearing 14 and in the second pump housing 10 by means of a second slide bearing 15 .
- the axes of rotation of the first pump pinion 6 and the second pump pinion 9 run parallel to one another, with the pump shaft 8 being gearedly coupled to the drive shaft 4 in a torque-transmitting manner.
- the gear pump 1 also has a second pump housing 10 which is fixed to the first pump housing 7 .
- the pump shaft 8 is coupled in a torque-transmitting manner to a third pump pinion 12, which is rotatably mounted in the second pump housing 10 and which meshes with a fourth pump pinion 13, which is rotatably mounted in the second pump housing 10, in such a way that a second fluid flows from a second low-pressure side to a second braid printing side can be conveyed.
- Hydraulic channels (not shown) are formed in the second pump housing 10 , which connect the second low-pressure side and the second high-pressure side of the geared engagement of the third pump pinion 12 with the fourth pump pinion 13 with hydraulic connections on the second pump housing 10 .
- the two pump pinions 12 , 13 are arranged in the second pump housing 10 so that they can rotate.
- a fluid is then divided by the rotation of the engaged impellers 12,13 into two partial flows, which respectively flow between the impellers 12,13 and the second pump housing 10 in the respective direction of rotation of the impellers 12,13.
- the fluid thus flows from the second pump inlet 28 to the second pump outlet 30.
- the third pump pinion 12 is non-rotatably connected to the pump shaft 8 via a key 12 .
- the fourth pump pinion 13 is attached by means of a third plain bearing 16 to a bolt 17 that is fixed relative to the second pump housing 10 stored. 1 also shows that the axis of rotation of the drive shaft 4 runs coaxially with the axis of rotation of the fourth pump pinion 13 and the axis of rotation of the second pump pinion 9 and the axis of rotation of the third pump pinion 12 also run coaxially.
- FIG. 1 also shows that an Oldham coupling is provided in the torque flow between the drive shaft 4 and the first pump pinion 6 .
- the first pump pinion 6 is supported via a plain bearing 21 on the stud bolt 23 which is pressed into the first pump housing 7 in a torque-proof manner.
- a pump seat 25 is arranged axially below the first and the second pump pinion 6.9 and is preloaded in the axial direction by the plate springs 26 in the axial direction.
- the pump gland 25 provides structural support for the plain bearings 14,21.
- the pump seat 25 can also serve as a wear surface for the pump pinion 6.9.
- the first pump housing 7 and the second pump housing 10 are centered in relation to one another via the pump shaft 8 and fixed in relation to one another by means of the screw connection 22 .
- the third and fourth pump pinions 12 , 13 are secured axially in the second pump housing 10 by the pump cover 24 , which is also fixed to the second pump housing 10 via the screw connection 22 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention relates to a gear pump (1), more particularly for an electrically operable drive train (2) of a motor vehicle (3), comprising a drive shaft (4), which can be driven by an electric motor (5), and a first pump pinion (6), which is torque-transmittingly coupled to the drive shaft (4) and is rotatably mounted in a first pump housing (7), wherein: - the first pump pinion (6) meshes with a second pump pinion (9) such that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side, the second pump pinion being rotatably mounted in the first pump housing (7) by means of a pump shaft (8); - the axes of rotation of the first pump pinion (6) and of the second pump pinion (9) run parallel to each other; - the pump shaft (8) is torque-transmittingly coupled to the drive shaft (4) by a transmission mechanism; - the gear pump (1) has a second pump housing (10), which is fixed on the first pump housing (7); and - the pump shaft (8) is torque-transmittingly coupled to a third pump pinion (12), which is rotatably mounted in the second pump housing (10) and meshes with a fourth pump pinion (13) such that a second fluid can be conveyed from a second low-pressure side to a second high-pressure side, the fourth pump pinion being rotatably mounted in the second pump housing (10).
Description
Zahnradpumpe gear pump
Die vorliegende Erfindung betrifft eine Zahnradpumpe, insbesondere für einen elektrisch betreibbaren Antriebsstrang eines Kraftfahrzeugs, umfassend eine Antriebswelle, welche von einem Elektromotor antreibbar ist, und ein erstes Pumpenritzel umfasst, das drehmomentübertragend mit der Antriebswelle gekoppelt und drehbar gelagert in einem ersten Pumpengehäuse angeordnet ist, wobei das erste Pumpenritzel mit einem zweiten, in dem ersten Pumpengehäuse mit einer Pumpenwelle drehbar gelagerten Pumpenritzel derart im Eingriff steht, dass ein erstes Fluid von einer ersten Niederdruckseite zu einer ersten Hochdruckseite förderbar ist, wobei die Rotationsachsen des ersten Pumpenritzels und des zweiten Pumpenritzels parallel zueinander verlaufen, und die Pumpenwelle getrieblich drehmomentübertragend mit der Antriebswelle gekoppelt ist. The present invention relates to a gear pump, in particular for an electrically operable drive train of a motor vehicle, comprising a drive shaft which can be driven by an electric motor and a first pump pinion which is coupled to the drive shaft in a torque-transmitting manner and is rotatably mounted in a first pump housing, wherein the first pump pinion meshes with a second pump pinion, which is rotatably mounted with a pump shaft in the first pump housing, in such a way that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side, the axes of rotation of the first pump pinion and the second pump pinion running parallel to one another , and the pump shaft is gearedly coupled to the drive shaft in a torque-transmitting manner.
Zahnradpumpen sind grundsätzlich aus dem Stand der Technik vorbekannt. Derartige Zahnradpumpen weisen in der Regel zwei ineinander kämmende Zahnräder auch als Pumpenritzel bezeichnet - auf, die innerhalb eines Pumpengehäuses durch eine Antriebswelle und einen Lagerzapfen drehbar gelagert sind. Gemeinsam mit einem Pumpeneinlass und einem Pumpenauslass bilden die Zahnräder innerhalb des Pumpengehäuses ein Förderkanalsystem, um einen Fluid zu fördern. Gear pumps are basically already known from the prior art. Gear pumps of this type generally have two meshing gear wheels, also referred to as pump pinions, which are rotatably mounted within a pump housing by a drive shaft and a bearing journal. Together with a pump inlet and a pump outlet, the gear wheels form a delivery channel system within the pump housing in order to deliver a fluid.
Ein mögliches Anwendungsgebiet derartiger Zahnradpumpen ist das Fördern eines Hydrauliköls innerhalb eines Kraftfahrzeugs. So sind beispielsweise Verbrennungsmotoren von Kraftfahrzeugen mit einer Schmierölpumpe ausgestattet, welche permanent Öl aus dem Ölsumpf zu Lagerstellen des Motors pumpt. Ein anderer bekannter Anwendungsfall von Zahnradpumpen findet sich bei Fahrzeuggetrieben, die eine separate Getriebeölpumpe benötigen. A possible area of application for such gear pumps is the delivery of hydraulic oil within a motor vehicle. For example, internal combustion engines in motor vehicles are equipped with a lubricating oil pump that constantly pumps oil from the oil sump to the bearing points of the engine. Another well-known application of gear pumps is found in vehicle transmissions that require a separate transmission oil pump.
Mit der zunehmenden Elektrifizierung von Antriebssträngen in Kraftfahrzeugen, kommen auch elektrische Achsantriebsstränge zum Einsatz, welche auch gelegentlich als E-Achse bezeichnet werden. Ein elektrischer Achsantriebsstrang eines Kraftfahrzeugs umfasst dabei in der Regel eine elektrische Maschine und ein
Getriebe, wobei die elektrische Maschine und das Getriebe eine bauliche Einheit bilden. Sowohl die elektrische Maschine als auch das Getriebe benötigt in derartigen Konfigurationen eine hydraulische Kühlung und/oder eine hydraulische Aktuatorik, beispielsweise für einen Gangwechsel in dem Getriebe. With the increasing electrification of drive trains in motor vehicles, electric axle drive trains are also being used, which are also sometimes referred to as e-axles. An electric axle drive train of a motor vehicle usually includes an electric machine and a Transmission, the electric machine and the transmission form a structural unit. In such configurations, both the electric machine and the transmission require hydraulic cooling and/or hydraulic actuators, for example for a gear change in the transmission.
Es ist somit die Aufgabe der vorliegenden Erfindung eine Zahnradpumpe bereitzustellen, die insbesondere hinsichtlich ihrer Anwendbarkeit in einer E-Achse optimiert ist. Es ist ferner die Aufgabe der Erfindung eine besonders kompakt bauende Zahnradpumpe mit einem guten Wirkungsgrad zu realisieren. It is therefore the object of the present invention to provide a gear pump which is optimized in particular with regard to its applicability in an e-axis. It is also the object of the invention to realize a particularly compact gear pump with good efficiency.
Diese Aufgabe wird gelöst durch eine Zahnradpumpe, insbesondere für einen elektrisch betreibbaren Antriebsstrang eines Kraftfahrzeugs, umfassend eine Antriebswelle, welche von einem Elektromotor antreibbar ist, und ein erstes Pumpenritzel umfasst, das drehmomentübertragend mit der Antriebswelle gekoppelt und drehbar gelagert in einem ersten Pumpengehäuse angeordnet ist, wobei das erste Pumpenritzel mit einem zweiten, in dem ersten Pumpengehäuse mit einer Pumpenwelle drehbar gelagerten Pumpenritzel derart im Eingriff steht, dass ein erstes Fluid von einer ersten Niederdruckseite zu einer ersten Hochdruckseite förderbar ist, wobei die Rotationsachsen des ersten Pumpenritzels und des zweiten Pumpenritzels parallel zueinander verlaufen, und die Pumpenwelle getrieblich drehmomentübertragend mit der Antriebswelle gekoppelt ist, wobei die Zahnradpumpe ein zweites Pumpengehäuse aufweist, welches an dem ersten Pumpengehäuse fixiert ist und die Pumpenwelle drehmomentübertragend mit einem dritten, in dem zweiten Pumpengehäuse drehbar gelagerten dritten Pumpenritzel gekoppelt ist, welches mit einem vierten, in dem zweiten Pumpengehäuse drehbar gelagerten Pumpenritzel derart in Eingriff steht, dass ein zweites Fluid von einer zweiten Niederdruckseite zu einer zweiten Hochdruckseite förderbar ist. This object is achieved by a gear pump, in particular for an electrically operable drive train of a motor vehicle, comprising a drive shaft which can be driven by an electric motor and a first pump pinion which is coupled to the drive shaft in a torque-transmitting manner and is rotatably mounted in a first pump housing. wherein the first pump pinion meshes with a second pump pinion, which is rotatably mounted with a pump shaft in the first pump housing, in such a way that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side, the axes of rotation of the first pump pinion and the second pump pinion being parallel to one another run, and the pump shaft is geared torque-transmitting coupled to the drive shaft, wherein the gear pump has a second pump housing which is fixed to the first pump housing and the pump shaft torque-transmitting with a third , is coupled in the second pump housing rotatably mounted third pump pinion, which is in engagement with a fourth pump pinion rotatably mounted in the second pump housing such that a second fluid can be conveyed from a second low-pressure side to a second high-pressure side.
In der erfindungsgemäßen Zahnradpumpe, welche auch als Tandem- Zahnradpumpe bezeichnet werden kann, da das erste und das zweite Pumpenritzel eine erste Pumpenhälfte und das dritte und vierte Pumpenritzel eine zweite Pumpenhälfte definieren, sind diese beiden Pumpenhälften in Reihe geschaltet. Somit befinden sich der Elektromotor und das direkt angetriebene erste
Pumpenritzel in derselben Gehäusehälfte. Das Antriebsmoment wird dann über die Pumpenwelle, welche wiederum vom zweiten Pumpenritzel der Zahnradpumpe in der ersten Gehäusehälfte angetrieben wird, auf die zweite Pumpenhälfte in dem zweiten Pumpengehäuse übertragen. Gleichzeitig erfolgt die Zentrierung der beiden Pumpengehäusehälften über ebenjene Pumpenwelle. Diese Ausgestaltung erlaubt es, die einzelnen Komponenten der Zahnradpumpe, wie die Pumpenritzel, Lager oder Pumpenwelle, möglichst einfach und fertigungstechnisch günstig zu gestalten. In the gear pump according to the invention, which can also be referred to as a tandem gear pump, since the first and second pump gears define a first pump half and the third and fourth pump gears define a second pump half, these two pump halves are connected in series. Thus, the electric motor and the directly driven first are located Pump pinion in the same half of the housing. The drive torque is then transmitted to the second pump half in the second pump housing via the pump shaft, which in turn is driven by the second pump pinion of the gear pump in the first half of the housing. At the same time, the two halves of the pump housing are centered using the same pump shaft. This configuration makes it possible to design the individual components of the gear pump, such as the pump pinion, bearing or pump shaft, as simply and inexpensively as possible in terms of manufacturing technology.
Zunächst werden die einzelnen Elemente des beanspruchten Erfindungsgegenstandes in der Reihenfolge ihrer Nennung im Anspruchssatz erläutert und nachfolgend besonders bevorzugte Ausgestaltungen des Erfindungsgegenstandes beschrieben. First, the individual elements of the claimed subject matter of the invention are explained in the order in which they are mentioned in the set of claims, and particularly preferred configurations of the subject matter of the invention are described below.
Die Zahnradpumpe ist eine Maschine zur Förderung von Fluiden. Die Zahnradpumpe ist bevorzugt als Außenzahnradpumpe konfiguriert, bei der das zu fördernde Fluid in Pumpenräumen zwischen den Zähnen zweier in Eingriff stehender als Stirnzahnräder ausgebildeten Pumpenritzel und dem Pumpengehäuse transportiert wird. Ferner ist es auch möglich, die Zahnradpumpe als Schraubenpumpe auszubilden, bei der in Eingriff stehenden Pumpenritzel als Spindelschrauben ausgebildet sind. The gear pump is a machine for pumping fluids. The gear pump is preferably configured as an external gear pump, in which the fluid to be pumped is transported in pump chambers between the teeth of two pump pinions, which are in engagement and are designed as spur gears, and the pump housing. Furthermore, it is also possible to design the gear pump as a screw pump, in which the pump pinions that are in engagement are designed as spindle screws.
Als Kraftfahrzeuge im Sinne dieser Anmeldung gelten Landfahrzeuge, die durch Maschinenkraft bewegt werden, ohne an Bahngleise gebunden zu sein. Ein Kraftfahrzeug kann beispielsweise ausgewählt sein aus der Gruppe der Personenkraftwagen (PKW), Lastkraftwagen (LKW), Kleinkrafträder, Leichtkraftfahrzeuge, Krafträder, Kraftomnibusse (KOM) oder Zugmaschinen. For the purposes of this application, motor vehicles are land vehicles that are moved by machine power without being tied to railroad tracks. A motor vehicle can be selected, for example, from the group of passenger cars (cars), trucks (lorries), mopeds, light motor vehicles, motorcycles, buses (COM) or tractors.
Im Sinne dieser Anmeldung werden unter dem Antriebsstrang eines Kraftfahrzeuges alle Komponenten verstanden, die im Kraftfahrzeug die Leistung für den Antrieb des Kraftfahrzeugs generieren und über die Fahrzeugräder bis auf die Straße übertragen.
Gemäß einer vorteilhaften Ausgestaltung der Erfindung kann vorgesehen sein, dass die Rotationsachse der Antriebswelle koaxial zu der Rotationsachse des vierten Pumpenritzels verläuft, was die kompakte Bauweise der Zahnradpumpe unterstützt. For the purposes of this application, the drive train of a motor vehicle is understood to mean all components that generate the power for driving the motor vehicle in the motor vehicle and transmit it to the road via the vehicle wheels. According to an advantageous embodiment of the invention, it can be provided that the axis of rotation of the drive shaft runs coaxially to the axis of rotation of the fourth pump pinion, which supports the compact design of the gear pump.
Es kann gemäß einer weiteren bevorzugten Weiterentwicklung der Erfindung auch vorgesehen sein, dass die Rotationsachse des zweiten Pumpenritzels und die Rotationsachse des dritten Pumpenritzels koaxial verläuft, was ebenfalls eine kompakte Bauform der Zahnradpumpe begünstigt. According to a further preferred development of the invention, it can also be provided that the axis of rotation of the second pump pinion and the axis of rotation of the third pump pinion run coaxially, which also promotes a compact design of the gear pump.
Des Weiteren kann es gemäß einer ebenfalls vorteilhaften Ausgestaltung der Erfindung vorgesehen sein, dass in dem ersten Pumpengehäuse hydraulische Kanäle ausgebildet sind, welche die erste Niederdruckseite und die erste Hochdruckseite des getrieblichen Eingriffs von erstem Pumpenritzel mit dem zweiten Pumpenritzel mit hydraulischen Anschlüssen an dem ersten Pumpengehäuse verbinden. Die vorteilhafte Wirkung dieser Ausgestaltung ist darin begründet, dass ein einfacher hydraulischer Anschluss an das erste Pumpengehäuse erfolgen kann. Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that hydraulic channels are formed in the first pump housing, which connect the first low-pressure side and the first high-pressure side of the geared engagement of the first pump pinion with the second pump pinion with hydraulic connections on the first pump housing . The advantageous effect of this configuration is based on the fact that a simple hydraulic connection can be made to the first pump housing.
In gleicherweise kann gemäß einerweiteren besonders bevorzugten Ausführungsform der Erfindung vorgesehen sein, dass in dem zweiten Pumpengehäuse hydraulische Kanäle ausgebildet sind, welche die zweite Niederdruckseite und die zweite Hochdruckseite des getrieblichen Eingriffs von drittem Pumpenritzel mit dem vierten Pumpenritzel mit hydraulischen Anschlüssen an dem zweiten Pumpengehäuse verbinden. Likewise, according to a further particularly preferred embodiment of the invention, provision can be made for hydraulic channels to be formed in the second pump housing, which connect the second low-pressure side and the second high-pressure side of the geared engagement of the third pump pinion with the fourth pump pinion with hydraulic connections on the second pump housing.
Des Weiteren kann die Erfindung auch dahingehend weiterentwickelt sein, dass im Momentenfluss zwischen der Antriebswelle und dem ersten Pumpenritzel eine Oldham-Kupplung vorgesehen ist, so dass sich ein radialer Versatz der Antriebswelle und des Pumpenritzels zueinander ausgleichen lässt.
In einer ebenfalls bevorzugten Ausgestaltungsvariante der Erfindung kann auch vorgesehen sein, dass die Pumpenwelle mittels eines ersten Gleitlagers in dem ersten Pumpengehäuse und mittels eines zweiten Gleitlagers in dem zweiten Pumpengehäuse gelagert ist, was ebenfalls eine kompakte Bauform begünstigt.Furthermore, the invention can also be further developed such that an Oldham coupling is provided in the torque flow between the drive shaft and the first pump pinion, so that a radial offset of the drive shaft and the pump pinion can be compensated for in relation to one another. In a likewise preferred embodiment variant of the invention, it can also be provided that the pump shaft is mounted in the first pump housing by means of a first plain bearing and in the second pump housing by means of a second plain bearing, which also promotes a compact design.
Aus dem gleichen Grund kann es auch vorteilhaft sein, die Erfindung dahingehend weiterzuentwickeln, dass das vierte Pumpenritzel mittels eines dritten Gleitlagers an einem gegenüber dem zweiten Pumpengehäuse feststehenden Bolzen gelagert ist. Der kompakte Aufbau lässt sich weiter verbessern, indem die Erfindung auch in vorteilhafter Weise dahingehend ausgeführt ist, dass der Rotor des Elektromotors koaxial zu der Antriebswelle angeordnet ist. For the same reason, it can also be advantageous to further develop the invention in such a way that the fourth pump pinion is mounted by means of a third slide bearing on a bolt that is fixed relative to the second pump housing. The compact structure can be further improved in that the invention is also advantageously implemented such that the rotor of the electric motor is arranged coaxially to the drive shaft.
Gemäß einer weiteren zu bevorzugenden Ausgestaltung des Erfindungsgegenstandes kann vorgesehen sein, dass in dem ersten Pumpengehäuse ein Wälzlager zur Lagerung der Antriebswelle angeordnet ist. According to a further preferred embodiment of the subject matter of the invention, it can be provided that a roller bearing for supporting the drive shaft is arranged in the first pump housing.
Nachfolgend wird die Erfindung anhand von Figuren ohne Beschränkung des allgemeinen Erfindungsgedankens näher erläutert werden. The invention will be explained in more detail below with reference to figures without restricting the general inventive idea.
Es zeigen: Show it:
Figur 1 eine Zahnradpumpe in einer schematischen Querschnittsansicht, FIG. 1 shows a gear pump in a schematic cross-sectional view,
Figur 2 zwei Schnittansichten durch verschiedene Ebenen der Zahnradpumpe in einer schematischen Darstellung und, Figure 2 two sectional views through different levels of the gear pump in a schematic representation and,
Figur 3 ein Kraftfahrzeug mit einem elektrischen Antriebstrang und einer darin verbauten Zahnradpumpe in einer schematischen Blockschaltdarstellung.
Die Figur zeigt eine Zahnradpumpe 1 , für einen elektrisch betreibbaren Antriebsstrang 2 eines Kraftfahrzeugs 3, wie er beispielhaft in der Figur 3 gezeigt ist. FIG. 3 shows a motor vehicle with an electric drive train and a gear pump installed therein in a schematic block diagram. The figure shows a gear pump 1 for an electrically operable drive train 2 of a motor vehicle 3, as shown by way of example in FIG.
Die Zahnradpumpe 1 umfasst eine Antriebswelle 4, welche von einem Elektromotor 5 antreibbar ist, und ein erstes Pumpenritzel 6, das drehmomentübertragend mit der Antriebswelle 4 gekoppelt und drehbar gelagert in einem ersten Pumpengehäuse 7 angeordnet ist. In dem ersten Pumpengehäuse 7 ist ein Wälzlager 18 zur Lagerung der Antriebswelle 4 angeordnet. Der Rotor 19 des Elektromotors 5 ist koaxial zu der Antriebswelle 4 angeordnet. The gear pump 1 comprises a drive shaft 4, which can be driven by an electric motor 5, and a first pump pinion 6, which is coupled to the drive shaft 4 in a torque-transmitting manner and is rotatably mounted in a first pump housing 7. A roller bearing 18 for supporting the drive shaft 4 is arranged in the first pump housing 7 . The rotor 19 of the electric motor 5 is arranged coaxially to the drive shaft 4 .
Das erste Pumpenritzel 6 steht mit einem zweiten, in dem ersten Pumpengehäuse 7 mit einer Pumpenwelle 8 drehbar gelagerten Pumpenritzel 9 derart im Eingriff, dass ein erstes Fluid von einer ersten Niederdruckseite zu einer ersten Hochdruckseite förderbar ist. Dies wird auch noch einmal gut aus der Schnittdarstellung A-A der Figur 2 deutlich, die einen entsprechenden Querschnitt durch die in der Figur 1 mit A-A bezeichneten Schnittebene zeigt. Grundsätzlich wäre es auch denkbar, dass das zweite Pumpenritzel 9 und die Pumpenwelle 8 einstückig ausgebildet sind. The first pump pinion 6 meshes with a second pump pinion 9 rotatably mounted in the first pump housing 7 with a pump shaft 8 such that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side. This also becomes clear once again from the sectional view A-A of FIG. 2, which shows a corresponding cross section through the sectional plane labeled A-A in FIG. In principle, it would also be conceivable for the second pump pinion 9 and the pump shaft 8 to be designed in one piece.
In dem ersten Pumpengehäuse 7 sind nicht dargestellte hydraulische Kanäle ausgebildet, welche die erste Niederdruckseite und die erste Hochdruckseite des getrieblichen Eingriffs von erstem Pumpenritzel 6 mit dem zweiten Pumpenritzel 9 mit hydraulischen Anschlüssen an dem ersten Pumpengehäuse 7 verbinden. Grundsätzlich zeigt diese Schnittansicht auch die grundsätzliche Funktionsweise einer Zahnradpumpe 1 , bei der die beiden Pumpenritzel 6,9 in dem ersten Pumpengehäuse 7 drehbar angeordnet sind. Ein Fluid wird dann durch die Rotation der in Eingriff stehenden Pumpenritzel 6,9 in zwei Teilströme aufgeteilt, die jeweils zwischen den Pumpenritzeln 6,9 und dem ersten Pumpengehäuse 7 in der jeweiligen Rotationsrichtung der Pumpenritzel 6,9 fließen. Das Fluid fließt so von dem ersten Pumpeneinlass 27 zu dem ersten Pumpenauslass 29. Hydraulic channels (not shown) are formed in the first pump housing 7 and connect the first low-pressure side and the first high-pressure side of the geared engagement of the first pump pinion 6 with the second pump pinion 9 with hydraulic connections on the first pump housing 7 . In principle, this sectional view also shows the basic functioning of a gear pump 1 in which the two pump pinions 6 , 9 are arranged in the first pump housing 7 so that they can rotate. A fluid is then divided by the rotation of the engaged impellers 6.9 into two partial flows which flow between the impellers 6.9 and the first pump housing 7 in the respective direction of rotation of the impellers 6.9. The fluid thus flows from the first pump inlet 27 to the first pump outlet 29.
Die Pumpenwelle 8 ist drehbar in dem ersten Pumpengehäuse 7 und dem zweiten Pumpengehäuse 10 gelagert. In der gezeigten Ausführungsform ist die
Pumpenwelle 8 mittels eines ersten Gleitlagers 14 in dem ersten Pumpengehäuse 7 und mittels eines zweiten Gleitlagers 15 in dem zweiten Pumpengehäuse 10 gelagert. The pump shaft 8 is rotatably supported in the first pump housing 7 and the second pump housing 10 . In the embodiment shown, the Pump shaft 8 is mounted in the first pump housing 7 by means of a first slide bearing 14 and in the second pump housing 10 by means of a second slide bearing 15 .
Wie aus der Figur 1 als auch der Figur 2, obere Abbildung hervorgeht, verlaufen die Rotationsachsen des ersten Pumpenritzels 6 und des zweiten Pumpenritzels 9 parallel zueinander, wobei die Pumpenwelle 8 getrieblich drehmomentübertragend mit der Antriebswelle 4 gekoppelt ist. As can be seen from FIG. 1 and FIG. 2, upper illustration, the axes of rotation of the first pump pinion 6 and the second pump pinion 9 run parallel to one another, with the pump shaft 8 being gearedly coupled to the drive shaft 4 in a torque-transmitting manner.
Die Zahnradpumpe 1 besitzt des Weiteren ein zweites Pumpengehäuse 10, welches an dem ersten Pumpengehäuse 7 fixiert ist. Die Pumpenwelle 8 ist drehmomentübertragend mit einem dritten, in dem zweiten Pumpengehäuse 10 drehbar gelagerten dritten Pumpenritzel 12 gekoppelt, welches mit einem vierten, in dem zweiten Pumpengehäuse 10 drehbar gelagerten Pumpenritzel 13 derart in Eingriff steht, dass ein zweites Fluid von einer zweiten Niederdruckseite zu einer zweiten Flochdruckseite förderbar ist. Dies wird erneut aus der Schnittdarstellung B- B der Figur 2 deutlich, die einen entsprechenden Querschnitt durch die in der Figur 1 mit B-B bezeichneten Schnittebene zeigt. In dem zweiten Pumpengehäuse 10 sind nicht abgebildete hydraulische Kanäle ausgebildet, welche die zweite Niederdruckseite und die zweite Hochdruckseite des getrieblichen Eingriffs von drittem Pumpenritzel 12 mit dem vierten Pumpenritzel 13 mit hydraulischen Anschlüssen an dem zweiten Pumpengehäuse 10 verbinden. The gear pump 1 also has a second pump housing 10 which is fixed to the first pump housing 7 . The pump shaft 8 is coupled in a torque-transmitting manner to a third pump pinion 12, which is rotatably mounted in the second pump housing 10 and which meshes with a fourth pump pinion 13, which is rotatably mounted in the second pump housing 10, in such a way that a second fluid flows from a second low-pressure side to a second braid printing side can be conveyed. This is again clear from the sectional representation BB of FIG. 2, which shows a corresponding cross section through the sectional plane labeled BB in FIG. Hydraulic channels (not shown) are formed in the second pump housing 10 , which connect the second low-pressure side and the second high-pressure side of the geared engagement of the third pump pinion 12 with the fourth pump pinion 13 with hydraulic connections on the second pump housing 10 .
Die Funktionsweise ist hierbei die folgende: Die beiden Pumpenritzel 12,13 sind in dem zweiten Pumpengehäuse 10 drehbar angeordnet. Ein Fluid wird dann durch die Rotation der in Eingriff stehenden Pumpenritzel 12,13 in zwei Teilströme aufgeteilt, die jeweils zwischen den Pumpenritzeln 12,13 und dem zweiten Pumpengehäuse 10 in der jeweiligen Rotationsrichtung der Pumpenritzel 12,13 fließen. Das Fluid fließt so von dem zweiten Pumpeneinlass 28 zu dem zweiten Pumpenauslass 30. The way it works is as follows: the two pump pinions 12 , 13 are arranged in the second pump housing 10 so that they can rotate. A fluid is then divided by the rotation of the engaged impellers 12,13 into two partial flows, which respectively flow between the impellers 12,13 and the second pump housing 10 in the respective direction of rotation of the impellers 12,13. The fluid thus flows from the second pump inlet 28 to the second pump outlet 30.
Das dritte Pumpenritzel 12 ist über eine Passfeder 12 drehfest mit der Pumpenwelle 8 verbunden. Das vierte Pumpenritzel 13 ist mittels eines dritten Gleitlagers 16 an einem gegenüber dem zweiten Pumpengehäuse 10 feststehenden Bolzen 17
gelagert. Aus der Figur 1 ist ferner ersichtlich, dass die Rotationsachse der Antriebswelle 4 koaxial zu der Rotationsachse des vierten Pumpenritzels 13 verläuft und auch die Rotationsachse des zweiten Pumpenritzels 9 und die Rotationsachse des dritten Pumpenritzels 12 koaxial verläuft. The third pump pinion 12 is non-rotatably connected to the pump shaft 8 via a key 12 . The fourth pump pinion 13 is attached by means of a third plain bearing 16 to a bolt 17 that is fixed relative to the second pump housing 10 stored. 1 also shows that the axis of rotation of the drive shaft 4 runs coaxially with the axis of rotation of the fourth pump pinion 13 and the axis of rotation of the second pump pinion 9 and the axis of rotation of the third pump pinion 12 also run coaxially.
In der Figur 1 ist ferner gezeigt, dass im Momentenfluss zwischen der Antriebswelle 4 und dem ersten Pumpenritzel 6 eine Oldham-Kupplung vorgesehen ist. Das erste Pumpenritzel 6 ist über ein Gleitlager 21 an dem Stehbolzen 23, der drehfest in das erste Pumpengehäuse 7 eingepresst ist, abgestützt. Axial unterhalb des ersten und des zweiten Pumpenritzels 6,9 ist eine Pumpenbrille 25 angeordnet, welche in axialer Richtung durch die Tellerfedern 26 in Axialrichtung vorgespannt ist. Die Pumpenbrille 25 stellt eine strukturelle Unterstützung für die Gleitlager 14,21 bereit. Die Pumpenbrille 25 kann auch als Verschleißfläche für die Pumpenritzel 6,9 dienen. FIG. 1 also shows that an Oldham coupling is provided in the torque flow between the drive shaft 4 and the first pump pinion 6 . The first pump pinion 6 is supported via a plain bearing 21 on the stud bolt 23 which is pressed into the first pump housing 7 in a torque-proof manner. A pump seat 25 is arranged axially below the first and the second pump pinion 6.9 and is preloaded in the axial direction by the plate springs 26 in the axial direction. The pump gland 25 provides structural support for the plain bearings 14,21. The pump seat 25 can also serve as a wear surface for the pump pinion 6.9.
Das erste Pumpengehäuse 7 und das zweite Pumpengehäuse 10 sind über die Pumpenwelle 8 zueinander zentriert und mittels der Schraubverbindung 22 gegeneinander fixiert. Das dritte und vierte Pumpenritzel 12,13 sind in dem zweiten Pumpengehäuse 10 axial durch den Pumpendeckel 24 gesichert, welche ebenfalls über die Schraubverbindung 22 an dem zweiten Pumpengehäuse 10 fixiert ist. The first pump housing 7 and the second pump housing 10 are centered in relation to one another via the pump shaft 8 and fixed in relation to one another by means of the screw connection 22 . The third and fourth pump pinions 12 , 13 are secured axially in the second pump housing 10 by the pump cover 24 , which is also fixed to the second pump housing 10 via the screw connection 22 .
Die Erfindung ist nicht auf die in den Figuren dargestellten Ausführungsformen beschränkt. Die vorstehende Beschreibung ist daher nicht als beschränkend, sondern als erläuternd anzusehen. Die nachfolgenden Patentansprüche sind so zu verstehen, dass ein genanntes Merkmal in zumindest einer Ausführungsform der Erfindung vorhanden ist. Dies schließt die Anwesenheit weiterer Merkmale nicht aus. Sofern die Patentansprüche und die vorstehende Beschreibung 'erste' und 'zweite' Merkmal definieren, so dient diese Bezeichnung der Unterscheidung zweier gleichartiger Merkmale, ohne eine Rangfolge festzulegen.
Bezuqszeichenliste The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two features of the same type, without specifying a ranking. Reference character list
1 Zahnradpumpe 1 gear pump
2 Antriebsstrang 3 Kraftfahrzeug 2 power train 3 motor vehicle
4 Antriebswelle 4 drive shaft
5 Elektromotor 5 electric motor
6 Pumpenritzel 6 pump sprockets
7 Pumpengehäuse 8 Pumpenwelle 7 pump housing 8 pump shaft
9 Pumpenritzel 9 pump sprockets
11 Kupplung 11 clutch
10 Pumpengehäuse 10 pump housing
12 Pumpenritzel 13 Pumpenritzel 12 pump sprocket 13 pump sprocket
14 Gleitlager 14 plain bearings
15 Gleitlager 15 plain bearings
16 Gleitlager 16 plain bearings
17 Bolzen 18 Wälzlager 17 bolts 18 roller bearings
19 Rotor 19 rotors
20 Passfeder 20 key
21 Gleitlager 21 plain bearings
22 Schraubverbindung 23 Stehbolzen 22 screw connection 23 stud bolts
24 Pumpendeckel 24 pump cover
25 Pumpenbrille 25 Pump Goggles
26 Tellerfeder 26 disk spring
27 erster Pumpeneinlass 28 zweiter Pumpeneinlass 27 first pump inlet 28 second pump inlet
29 erster Pumpenauslass 29 first pump outlet
30 zweiter Pumpenauslass
30 second pump outlet
Claims
1. Zahnradpumpe (1 ), insbesondere für einen elektrisch betreibbaren Antriebsstrang (2) eines Kraftfahrzeugs (3), umfassend eine Antriebswelle (4), welche von einem Elektromotor (5) antreibbar ist, und ein erstes Pumpenritzel (6) umfasst, das drehmomentübertragend mit der Antriebswelle (4) gekoppelt und drehbar gelagert in einem ersten Pumpengehäuse (7) angeordnet ist, wobei das erste Pumpenritzel (6) mit einem zweiten, in dem ersten Pumpengehäuse (7) mit einer Pumpenwelle (8) drehbar gelagerten Pumpenritzel (9) derart im Eingriff steht, dass ein erstes Fluid von einer ersten Niederdruckseite zu einer ersten Hochdruckseite förderbar ist, wobei die Rotationsachsen des ersten Pumpenritzels (6) und des zweiten Pumpenritzels (9) parallel zueinander verlaufen, und die Pumpenwelle (8) getrieblich drehmomentübertragend mit der Antriebswelle (4) gekoppelt ist, dadurch gekennzeichnet, dass die Zahnradpumpe (1) ein zweites Pumpengehäuse (10) aufweist, welches an dem ersten Pumpengehäuse (7) fixiert ist und die Pumpenwelle (8) drehmomentübertragend mit einem dritten, in dem zweiten Pumpengehäuse (10) drehbar gelagerten dritten Pumpenritzel (12) gekoppelt ist, welches mit einem vierten, in dem zweiten Pumpengehäuse (10) drehbar gelagerten Pumpenritzel (13) derart in Eingriff steht, dass ein zweites Fluid von einer zweiten Niederdruckseite zu einer zweiten Hochdruckseite förderbar ist. 1. Gear pump (1), in particular for an electrically operable drive train (2) of a motor vehicle (3), comprising a drive shaft (4) which can be driven by an electric motor (5), and a first pump pinion (6) which transmits torque coupled to the drive shaft (4) and rotatably mounted in a first pump housing (7), the first pump pinion (6) being connected to a second pump pinion (9) rotatably mounted in the first pump housing (7) with a pump shaft (8). is engaged in such a way that a first fluid can be conveyed from a first low-pressure side to a first high-pressure side, the axes of rotation of the first pump pinion (6) and the second pump pinion (9) running parallel to one another, and the pump shaft (8) being geared to transmit torque with the Drive shaft (4) is coupled, characterized in that the gear pump (1) has a second pump housing (10) which fixi to the first pump housing (7). and the pump shaft (8) is coupled in a torque-transmitting manner to a third pump pinion (12) which is rotatably mounted in the second pump housing (10) and which is connected to a fourth pump pinion (13) which is rotatably mounted in the second pump housing (10) in such a way that it Engaged is that a second fluid can be pumped from a second low-pressure side to a second high-pressure side.
2. Zahnradpumpe (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass die Rotationsachse der Antriebswelle (4) koaxial zu der Rotationsachse des vierten Pumpenritzels (13) verläuft.
2. Gear pump (1) according to claim 1, characterized in that the axis of rotation of the drive shaft (4) runs coaxially to the axis of rotation of the fourth pump pinion (13).
3. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Rotationsachse des zweiten Pumpenritzels (9) und die Rotationsachse des dritten Pumpenritzels (12) koaxial verläuft. 3. Gear pump (1) according to any one of the preceding claims, characterized in that the axis of rotation of the second pump pinion (9) and the axis of rotation of the third pump pinion (12) runs coaxially.
4. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass in dem ersten Pumpengehäuse (7) hydraulische Kanäle ausgebildet sind, welche die erste Niederdruckseite und die erste Hochdruckseite des getrieblichen Eingriffs von erstem Pumpenritzel (6) mit dem zweiten Pumpenritzel (9) mit hydraulischen Anschlüssen an dem ersten Pumpengehäuse (7) verbinden. 4. Gear pump (1) according to any one of the preceding claims, characterized in that in the first pump housing (7) hydraulic channels are formed, which the first low-pressure side and the first high-pressure side of the geared engagement of the first pump pinion (6) with the second pump pinion ( 9) to hydraulic connections on the first pump housing (7).
5. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass in dem zweiten Pumpengehäuse (10) hydraulische Kanäle ausgebildet sind, welche die zweite Niederdruckseite und die zweite Hochdruckseite des getrieblichen Eingriffs von drittem Pumpenritzel (12) mit dem vierten Pumpenritzel (13) mit hydraulischen Anschlüssen an dem zweiten Pumpengehäuse (10) verbinden. 5. Gear pump (1) according to any one of the preceding claims, characterized in that in the second pump housing (10) hydraulic channels are formed, which the second low-pressure side and the second high-pressure side of the geared engagement of the third pump pinion (12) with the fourth pump pinion ( 13) with hydraulic connections on the second pump housing (10).
6. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass im Momentenfluss zwischen der Antriebswelle (4) und dem ersten Pumpenritzel (6) eine Oldham-Kupplung (11) vorgesehen ist. 6. Gear pump (1) according to one of the preceding claims, characterized in that an Oldham coupling (11) is provided in the torque flow between the drive shaft (4) and the first pump pinion (6).
7. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Pumpenwelle (8) mittels eines ersten Gleitlagers (14) in dem ersten Pumpengehäuse (7) und mittels eines zweiten Gleitlagers (15) in dem zweiten Pumpengehäuse (10) gelagert ist.
7. Gear pump (1) according to one of the preceding claims, characterized in that the pump shaft (8) by means of a first plain bearing (14) in the first pump housing (7) and by means of a second plain bearing (15) in the second pump housing (10) is stored.
8. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das vierte Pumpenritzel (13) mittels eines dritten Gleitlagers (16) an einem gegenüber dem zweiten Pumpengehäuse (10) feststehenden Bolzen (17) gelagert ist. 8. Gear pump (1) according to any one of the preceding claims, characterized in that the fourth pump pinion (13) is mounted by means of a third slide bearing (16) on a bolt (17) fixed relative to the second pump housing (10).
9. Zahnradpumpe (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass in dem ersten Pumpengehäuse (7) ein Wälzlager (18) zur Lagerung der Antriebswelle (4) angeordnet ist. 9. Gear pump (1) according to one of the preceding claims, characterized in that in the first pump housing (7) a roller bearing (18) for supporting the drive shaft (4) is arranged.
10. Zahnradpumpe (1) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Rotor (19) des Elektromotors (5) koaxial zu der Antriebswelle (4) angeordnet ist.
10. Gear pump (1) according to any one of the preceding claims, characterized in that the rotor (19) of the electric motor (5) is arranged coaxially to the drive shaft (4).
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DE102020130990.2 | 2020-11-24 |
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DE102022128264A1 (en) | 2022-10-25 | 2024-04-25 | Valeo Powertrain Gmbh | Gear pump |
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DE102009045574A1 (en) * | 2009-10-12 | 2011-04-14 | Robert Bosch Gmbh | Two internal gear pump |
WO2011076172A2 (en) * | 2009-12-21 | 2011-06-30 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic control |
US20140178230A1 (en) * | 2012-12-20 | 2014-06-26 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Pump |
WO2018153605A1 (en) * | 2017-02-24 | 2018-08-30 | Robert Bosch Gmbh | Gear pump for a waste heat recovery system |
DE102020112778A1 (en) * | 2019-05-13 | 2020-11-19 | Parker Hannifin Corporation | COMPACT TWO-PART GEAR PUMP |
-
2021
- 2021-11-12 WO PCT/DE2021/100907 patent/WO2022111757A1/en active Application Filing
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DE10112500A1 (en) * | 2001-03-15 | 2002-09-26 | Linde Ag | Electrohydraulic drive unit, e.g. for used in warehouse vehicles, has electric motor, hydraulic pump driven by motor, further electric motor integrated into electric motor with drive connection to further hydraulic pump |
DE102009045574A1 (en) * | 2009-10-12 | 2011-04-14 | Robert Bosch Gmbh | Two internal gear pump |
WO2011076172A2 (en) * | 2009-12-21 | 2011-06-30 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic control |
US20140178230A1 (en) * | 2012-12-20 | 2014-06-26 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Pump |
WO2018153605A1 (en) * | 2017-02-24 | 2018-08-30 | Robert Bosch Gmbh | Gear pump for a waste heat recovery system |
DE102020112778A1 (en) * | 2019-05-13 | 2020-11-19 | Parker Hannifin Corporation | COMPACT TWO-PART GEAR PUMP |
Cited By (1)
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DE102022128264A1 (en) | 2022-10-25 | 2024-04-25 | Valeo Powertrain Gmbh | Gear pump |
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