DE102022206319A1 - Electric gear pump for a motor vehicle, in particular a gerotor pump and a set of several gear pumps - Google Patents

Abstract

The invention relates to an electric gear pump, in particular a gerotor pump for a motor vehicle for pumping a fluid (F), such as oil, which extends in an axial direction (12), with a housing (4) which has a cover-side housing part (6) on the front side. and in which two pump units (16A, 16B) are arranged, which follow one another in the axial direction (12) and are driven by a common drive shaft (22) extending in the axial direction (12) along a shaft axis (24), between the two pump units (16A, 16B) a partition wall designed as a separating disk (34) is arranged. The invention further relates to a set of at least two such gear pumps, one of which does not have a cutting disk (34).

Description

The invention relates to an electric gear pump, in particular a gear ring pump for pumping a fluid, in particular oil. The pump is in particular a gerotor pump. The invention further relates to a set consisting of several such electric gear pumps.

Gear pumps and in particular gear pumps such as gerotor pumps are used specifically in the motor vehicle sector, particularly as oil pumps. For example, the oil is sucked out of an oil sump using the pump and pumped into an oil tank or to the components to be supplied.

The structure of gerotors is well known. These generally have a rotor set (gear set) with an internally toothed outer rotor (external toothed ring) and an externally toothed inner rotor (internal toothed ring). The inner rotor is driven and runs eccentrically within the outer ring.

In the case of gerotors, it is known to arrange several pump units, each formed from a rotor set consisting of an outer rotor and an inner rotor, lined up next to one another on a common drive shaft.

For example, from the one that was still unpublished at the time of filing this application DE 10 2021 207 694.7 a gerotor pump for a lubricant supply system of a motor vehicle, in which a total of three pump units are arranged on a common shaft. Two of the pump units form suction pumps and one of the pump units forms a pressure pump. The entire gerotor pump is arranged in an oil tank, with oil being sucked in from a dry sump via the two suction pumps and discharged into the oil tank via the pressure pump. The two pump units of the suction pumps are separated from each other by a T-shaped housing partition - viewed in half cross section.

From the WO 2022/037 569 A1 There is a gerotor pump with two pump units that are separated from each other by a cup-shaped separating element. The two pump units are attached to a drive shaft that can rotate in different directions of rotation, with each pump only being effective in one direction of rotation.

Functionally reliable, yet cost-effective solutions are sought, particularly in the automotive sector. Gerotor pumps with several pump units and the required separation of the individual volume spaces of the different pump units from one another are often structurally complex.

Based on this, the invention is based on the object of specifying a functionally reliable and cost-effective gear pump, in particular a gerotor pump, which has several pump units.

The object is achieved according to the invention by an electric gear pump for a motor vehicle for pumping a fluid, in particular for pumping oil, which is in particular a gerotor pump. This extends in an axial direction and has a housing which has a cover-side housing part at the front and two pump units are arranged in the housing, which follow one another in the axial direction and which are driven by a common drive shaft extending in the axial direction along a shaft axis. A partition wall, which is designed as a separating disk, is arranged between the two pump units.

In contrast to the partitions between the two pump units known from the prior art, which are either a one-piece part of the housing itself or have a complex cup-shaped geometry, the partition in the present case is formed by a simple, flat separating disk, which therefore defines the internal volume of the two Pump units reliably separate from one another in the axial direction, so that the two pump units are each designed as independent pump units, each of which is suitable for pumping the fluid independently of the other pump unit. By designing the cutting disc as a simple, flat disc, it can be produced using simple means and therefore inexpensively. At the same time, this configuration enables a modular structure and a modular system in which different types of pumps can be formed using identical parts. Since the cutting disc is designed as a simple flat disc arranged between the two pump units, specifically without axial extensions, it is possible to create a type of pump by eliminating the cutting disc in which the two pump units are arranged directly axially one after the other without a partition, so that they essentially form a common, enlarged pump unit.

In a preferred embodiment, the cutting disk is a separate component and is in particular designed as a perforated disk which is arranged between the two pump units is. At least in the initial state before assembly of the pump, the cutting disk is therefore present as an independent component designed as a flat perforated disk. When assembling the pump, it can be connected to one of the other components of the pump.

Alternatively, according to a preferred embodiment, the cutting disk is arranged loosely between the two pump units. This is understood to mean that it is not connected to any of the other components in a fixed manner, in particular in a rotationally fixed manner, for example by a form fit, a material fit or in some other way. During assembly, the cutting disc is simply pushed onto the drive shaft without necessarily being connected to it in a rotationally fixed manner. No further attachment is required; it is arranged between the pump units and held by them in the desired position. The cutting disc can certainly rotate during operation, but due to the loose arrangement, this rotation does not necessarily have to take place at the speed of rotation of the drive shaft.

The cutting disk usually rests directly on the two pump units. It is preferably clamped between these. A fixation that only clamps in the axial direction is viewed here as a loose arrangement of the cutting disk.

The pump is generally preferably designed as a gerotor and has a gear set with an externally toothed inner rotor and an internally toothed outer rotor.

According to a first embodiment variant, the cutting disk is preferably arranged concentrically to the two inner rotors. The cutting disk is therefore arranged overall concentrically to the shaft axis of the drive shaft.

The cutting disk is preferably attached to the drive shaft in a particularly rotationally fixed manner. For example, it is interlocked with the drive shaft in a form-fitting manner by means of a toothing or is connected to it in a material or frictional manner.

Alternatively, there is also the possibility that the cutting disk is simply arranged loosely between the two pump units and is simply pushed onto the drive shaft without being directly connected to it in a rotationally fixed manner.

In this arrangement, which is concentric with the inner rotors, the cutting disk is preferably clamped between the two inner rotors, so that it is forcibly carried along with the inner rotors, for example, by the clamping or pressing force.

The radial extent of the cutting disk is fundamentally chosen such that the individual volumes of the two pump units are reliably separated from one another. According to a first variant, the cutting disk has a radial extent such that it does not protrude beyond the outer circumference of the outer rotors in the radial direction. The cutting disk preferably has such a radial extent that it is spaced at least in some peripheral sections from the outer circumference of the outer rotors, i.e. is set back from them and does not extend to the outer circumference of the respective outer rotor. Alternatively, the cutting disk protrudes radially beyond the outer circumference of the outer rotors only in some peripheral sections and reaches a maximum of the outer circumference of the outer rotors in other peripheral sections. The cutting disc is typically, but not necessarily, circular.

In a useful alternative embodiment, the cutting disk is arranged concentrically to the outer rotors. Due to the eccentric arrangement, in this embodiment the central inner hole of the cutting disk designed as a perforated disk, with which it is pushed onto the drive shaft, is larger than the diameter of the drive shaft and is also arranged eccentrically to the shaft axis, so that the hole edge is specifically in a circumferential section This central inner hole of the cutting disc is spaced from the drive shaft.

In a preferred embodiment, the cutting disk is arranged between the two outer rotors and in particular is clamped and preferably rotates with them during operation.

In a preferred further embodiment, the cutting disk extends in the radial direction into the housing. The cutting disk is preferably held on the housing, for example clamped between two housing parts, so that the cutting disk does not rotate during operation. In this embodiment, too, the cutting disk is preferably arranged loosely overall, so it is not attached to the housing, for example by fasteners or through material bonding, but - if at all - only held on the housing in the axial direction and possibly in a clamping manner.

In this embodiment variant, in which the cutting disk extends into the housing, it is further preferably provided that in the cutting disk in a radially outer circumferential region there is at least one channel opening and preferably two channel openings for each has an axially extending flow path for the fluid. This flow path is formed by a channel section which is formed outside the pump units and in particular inside the housing and is guided past the pump units in the axial direction. This generally serves to feed the fluid to be pumped past one of the pump units to the other pump. This makes it possible and it is provided that both pump units are each connected to connection openings or connection pieces (suction side or pressure side) on a common end face, especially on the cover of the pump housing.

In a preferred embodiment, it is further provided that two connection openings are provided on the front side of the cover-side housing part, which are formed, for example, by connecting pieces or which are connected to connecting pieces of an additional cover. These connecting pieces extend in particular in the axial direction. The two connection openings are intended for parallel delivery of the fluid to be pumped. This means that the fluid is conveyed in the same direction via the two connection openings, i.e. that the fluid is either sucked in or pumped (expelled) via the two connection openings. In the first case, the connection openings are designed as suction openings and in the second case as pressure openings. The two connection openings are preferably designed as suction openings. A first channel leads from one of the two connection openings to the first pump unit and a second channel leads from the other connection opening to the second pump unit. This configuration reliably ensures separate pumping via the two pump units.

In a preferred embodiment, the first channel opens at the front of the first pump unit. The second channel is guided past the two pump units on the radial outside and opens at the end face of the second pump unit opposite the cover-side housing part. This reliably ensures that the two pump units can be effective independently of one another, with their suction sides and/or pressure sides each being guided to a common, in particular front-side, connection point on the cover-side housing part.

This design is viewed as an independently inventive aspect. The right to file a divisional application based on this remains reserved. This embodiment has the features of claim 1, but with any design of the partition or even altogether without a partition between the pump units, in combination with the first channel, which opens at the front of the first pump unit and with the second channel, which opens radially on the outside is guided past the two pump units. The preferred developments described below also apply to this independently inventive embodiment.

At least one further and preferably exactly one further connection opening is preferably formed on the cover-side housing part, which is preferably connected to both pump units. This further connection opening is designed in particular as a pressure opening. As an alternative to the configuration in which two suction openings are guided to a common pressure opening, the reverse configuration is provided, in which one suction opening is guided to two pressure openings.

This generally creates a gerotor pump with two separate pump units, in particular designed as suction units. This is used in the motor vehicle sector in particular for pumping the fluid from a pump volume, especially from an oil pan, with the two suction openings being connected to different portions of this pump volume, especially the oil pan. This is based on the consideration that in the motor vehicle sector, driving situations can occur, for example, due to strong acceleration or on steep gradients, in which the oil only collects in certain areas. The two separate pump units ensure that the oil is reliably sucked in and pumped in every operating situation.

A third channel extends from the further connection opening, which is designed in particular as a common connection opening and in particular as a common pressure opening for both pump units, to the two pump units. This is divided into two channel sections, one of which leads to the first pump unit and the other to the second pump unit. The two channel sections typically open out at the front side of a respective pump unit, namely on opposite sides, i.e. H. one channel section opens at the end face of the first pump unit oriented towards the cover-side housing part and the second channel section opens at the end face of the second pump unit opposite the cover-side housing part. The second channel section is again guided past the two pump units in the axial direction and radially on the outside.

In general, the two pump units each have a front suction inlet and a front pressure outlet, this suction Inputs and pressure outputs of the two pump units are arranged opposite one another when viewed in the axial direction, namely the suction inlet and the pressure output of the first pump unit on the side facing the cover-side housing part and the suction inlet and the pressure output of the second pump unit on the side facing away from the cover-side housing part.

According to the invention, the object is further achieved by a set consisting of at least two electric gear pumps as described above, although the cutting disk is omitted in one gear pump. This means that the set consists of two gear pumps, specifically gerotor pumps, one pump with a cutting disc and the other pump without a cutting disc.

This results in a modular building block principle based on the common parts principle, in which different types of pumps can be formed with the largest possible number of common parts. In the type of pump that dispenses with the cutting disc, the two pump units preferably lie directly against one another in the axial direction and therefore form a common pump unit, which is formed from the two sets of rotors or gears, which essentially form a common set of rotors.

All parts of the two pumps are preferably identical and are therefore designed as identical parts, so that they only differ in terms of the absence of the cutting disk.

In a preferred embodiment, an additional adapter is additionally formed, which connects the two connection openings, which are designed for parallel conveying, to one another, so that the two connection openings are guided to a common connection opening. The additional adapter is placed, for example, on the two connection pieces of the two connection openings.

Alternatively, in the case of the pump without a cutting disk, in one embodiment variant, only the cover-side housing part can be designed differently, so that, for example, only two connection openings, namely a suction opening and a pressure opening, are provided on the cover-side housing part.

As described above, two flow paths for the fluid are typically formed in the housing, extending in the axial direction and passing radially on the outside of the two pump units, namely the previously described second channel (suction channel), which is connected to one of the two connection openings, and the second channel section ( Pressure section), which is connected to the common additional connection opening. These flow paths are therefore also present in the pump without a separating disk and are used, for example, to supply the second, rear pump unit from the end face opposite the cover-side housing part.

In a preferred embodiment, the housing has, in addition to the cover-side housing part, a motor-side housing part, with a vertical separating plane of the housing being formed between the two housing parts, which is therefore oriented perpendicular to the axial direction.

In a preferred embodiment, one pump unit is housed in the cover-side housing part and the other pump unit is housed in the motor-side housing part.

The separating disk, which preferably lies within the separating plane, therefore forms a separating wall between the two pump rooms of the two pump units.

In a preferred embodiment, the cutting disk is fixed to the housing and is therefore arranged in a fixed manner. It is specifically clamped between the two housing parts. In a preferred embodiment, it thus forms a fixed housing partition which is arranged between the two pump units. Such a design is particularly easy to assemble.

In general, the separating disk separates the individual pump chambers of the two pump units from each other. The term “individual pump chamber” refers to the internal volume of the respective pump unit in which the fluid is compressed. For the gerotor pump, this is the free space between the outer rotor and the inner rotor.

• 1A eine vereinfachte Längsschnittdarstellung einer Gerotor-Pumpe mit zwei Pumpeinheiten mit einer Trennscheibe, die konzentrisch zu den Innenrotoren angeordnet ist gemäß einer ersten Variante,
• 1B einen Querschnitt entlang der Schnittlinie I-I in 1A
• 2A eine vereinfachte Längsschnittdarstellung ähnlich 1A mit einer Trennscheibe, die konzentrisch zu den Innenrotoren angeordnet ist gemäß einer zweiten Variante,
• 2B einen Querschnitt entlang der Schnittlinie II-II in 2A
• 3A eine vereinfachte Längsschnittdarstellung ähnlich 1, wobei die Trennscheibe jedoch konzentrisch zu den Außenrotoren angeordnet ist,
• 3B einen Querschnitt entlang der Schnittlinie III-III in 3A
• 4A eine vereinfachte Längsschnittdarstellung ähnlich 1, wobei auf die Trennscheibe verzichtet ist, sowie
• 4B einen Querschnitt entlang der Schnittlinie IV-IV in 4A.

Exemplary embodiments of the invention are explained in more detail below with reference to the figures. These each show in simplified representations:

• 1A a simplified longitudinal sectional view of a gerotor pump with two pump units with a cutting disk that is arranged concentrically to the inner rotors according to a first variant,
• 1B a cross section along section line II in 1A
• 2A a simplified longitudinal section view similar 1A with a cutting disk which is arranged concentrically to the inner rotors according to a second variant,
• 2 B a cross section along section line II-II in 2A
• 3A a simplified longitudinal section view similar 1 , but the cutting disc is arranged concentrically to the outer rotors,
• 3B a cross section along the section line III-III in 3A
• 4A a simplified longitudinal section view similar 1 , whereby the cutting disc is omitted, as well
• 4B a cross section along section line IV-IV in 4A .

A gear pump shown in different embodiment variants in the figures is designed as a gerotor pump, hereinafter referred to as gerotor 2. It has a housing 4, which essentially has two housing parts, namely a cover-side housing part 6, which is also referred to as a pump flange. In the exemplary embodiments, a cover is connected to this. Alternatively, the cover-side housing part 6 can also form the cover itself. A plurality of connecting pieces extending in the axial direction, namely two suction pieces and a pressure piece, are generally formed on the front side of the cover. A first suction opening 8A and a second suction opening 8B as well as a pressure opening 10 are formed on the front side of the housing part 6 on the cover side. This cover-side housing part 6 is adjoined in an axial direction 12 by a further motor-side housing part 14. The cover-side housing part 6 and the motor-side housing part 14 enclose a common pump chamber between them, in which two pump units are arranged, namely a first pump unit 16A and a second pump unit 16B, which adjoin one another in the axial direction 12. Each pump unit 16A, B has a rotor set consisting of an internally toothed outer rotor 18 and an externally toothed inner rotor 20. The two inner rotors 20 are arranged on a common drive shaft 22, which extends along a shaft axis 24 in the axial direction 12. The drive shaft 22 runs through a rear partition of the housing 4 in the axial direction 12 into a motor part 17 of the gerotor 2, in which an electric motor for driving the drive shaft 22 is arranged.

The two sets of rotors and thus the two pump units 16A, 16B are designed identically in the exemplary embodiment, therefore have the same axial length as well as the same radial extent and the dimensions of the inner rotors 20 and the outer rotors 18 are identical. In principle, however, there is the possibility that the two pump units 16A, 16B are dimensioned differently. They then preferably only differ in their axial lengths with otherwise the same dimensions. This applies to all variants according to the figures.

The cover-side housing part 6, in particular in combination with the cover, not shown, closes the pump chamber at the front and the motor-side housing part 14 closes the pump chamber at the back, i.e. H. the cover-side housing part 6 or the cover forms a front wall and the motor-side housing part 14 forms a front rear wall and thus the partition wall to the motor part 17.

In the exemplary embodiment, the cover-side housing part 6 is designed as a component with continuous channels. In combination with the cover, not shown, it is then - just like the motor-side housing part 14 - approximately cup-shaped. Both housing parts 6, 14 have an axially extending housing wall and the motor-side housing part 14 and the cover have a radially extending housing wall. Inlet and outlet openings for a fluid F to be pumped are only formed on the cover side in the exemplary embodiment.

Starting from the first suction opening 8A, a first channel 26A leads to the first pump unit 16A and opens at its end face, so that the fluid F can flow into the volume formed between the outer rotor 18 and inner rotor 20.

Starting from the second suction opening 8B, a second channel 26B leads to the second pump unit 16B and opens at its end face opposite the cover-side housing part 6, so that the fluid F can flow into the volume of the second pump unit 16B formed between the outer rotor 18 and inner rotor 20. This second channel 26B is guided along the radial outside of the two pump units 16A, 16B in the axial direction 12. For this purpose, a suitable flow channel is formed in the housing 4, for example. This flow channel, which extends parallel to the axial direction 12, opens into a collecting space 28 which extends in the radial direction towards the shaft axis 24, so that the fluid F can flow into the second pump unit 16B at the front. The collecting space 28 is designed, for example, as a recess in the front rear housing wall of the further housing part 14.

During operation of the gerotor 2, the inner rotors 20 are driven together by the drive shaft 22 and rotate in the same direction. The respective outer rotor 18 is eccentric with respect to the inner rotor 20 and thus with respect to the shaft axis 24 rically arranged and rotates during operation about an eccentric axis 30. This results in a compression of the fluid F in a manner known per se, which emerges from the respective pump unit 16A, 16B at the front side on a pressure side, as shown by the dashed lines in the 1A , 2A , 3A , 4A is indicated.

On this pressure side, which is shown in the lower half of the figure in the figures, i.e. below the drive shaft 22, collecting spaces 28 are formed both in the cover-side housing part 6 and in the rear wall of the motor-side housing part 14, into which the fluid F from the respective pump unit 16A, 16B emerges. The fluid F emerging from the two pump units 16A, 16B on the pressure side is fed to the common pressure opening 10.

In order to enable this pressure-side flow path, the pressure opening 10 is followed by a third channel 32, which is divided into a first channel section 32A and a second channel section 32B. In the exemplary embodiment, the first channel section 32A is formed by the cover-side collecting space 28 and leads to the cover-side end face of the first pump unit 16A. The second channel section 32B runs radially on the outside past the two pump units 16A, 16B. The second channel section 32B connects the two pressure-side collecting spaces 28.

The pump rooms or internal volumes of the two pump units 16A, 16B are fluidly separated from each other in the embodiment variants according to 1A , 2A , 3A separated by a separating disk 34, so that the two pump units 16A, 16B form separate pump units and each pump unit 16A, 16B can effectively pump independently.

In these two embodiment variants, the cutting disk 34 is designed as a simple, flat cutting disk 34, which is designed as a perforated disk with a central hole 36. The central hole 36 and the outer circumference of the cutting disk 34 are in particular circular and concentric to one another. The cutting disk 34 is designed in particular as an independent component. It is preferably held loosely. This means that it is not firmly connected to any other component, for example through a cohesive connection such as gluing, welding or with the help of fastening elements.

In the design variants of 1A as well as 1 B, the cutting disk 34 is arranged concentrically to the shaft axis 24 and thus to the inner rotor 20. It is preferably clamped between the two inner rotors 20 and rotates with them and with the drive shaft 22. In principle, there is also the possibility that the cutting disk 24 is connected to the drive shaft 22 in a rotationally fixed manner.

In the embodiment variant of 1A The cutting disk 34 extends at least in a partial circumferential area up to a maximum of a radial outer circumference of the outer rotors 18. Depending on the design, due to the eccentric arrangement of the outer rotors 18, the cutting disk 34 is somewhat retracted or stands somewhat radially relative to the outer rotor 18 at least in some partial areas of the circumference over this something and extends into one of the flow channels running radially on the outside and ends in it, as can be seen from the upper half of the picture 1A can be recognized. The cutting disk 34 is therefore slightly above the outer circumference of the respective outer rotor 18 in some peripheral areas or, alternatively, is set back slightly.

In the embodiment variant of 2A The cutting disk 34 is also arranged concentrically to the inner rotors 20, but extends in the radial direction into an outer housing wall of the housing 4, i.e. it penetrates the flow channels 26B, 32B. The cutting disk has a channel opening 38 in each area.

In the embodiment variant of 3A the cutting disk 34 is arranged concentrically to the two outer rotors 18 and thus coaxially to the eccentric axis 30.

In the embodiment variant according to 3A the central hole 36 is larger than the drive shaft 22 due to the eccentric arrangement of the cutting disk 34, so that a hole edge of the central hole 36 is spaced from the drive shaft 22 at least in some peripheral sections, as shown in the lower half of the picture 3A is recognizable. In the exemplary embodiment, the cutting disk has the same outer diameter as the two outer rotors 18. Alternatively, another design is similar 2A possible, in which the cutting disk 34 extends to an outer housing wall of the housing 4.

According to one embodiment variant, the cover-side housing part 6 and the motor-side housing part 14 lie against one another at a dividing plane of the housing 4, as is the case in the variants according to an example 1A and 2A is shown. In this case, this dividing plane also forms a dividing plane between the two pump units 16A, 16B. The cutting disk 34 is arranged within this separation plane.

Alternatively, there is also the possibility that the dividing or separating plane is formed within the cover-side housing part 6, as shown in FIGS 3A as well as 4A is shown as an example.

In the embodiment variant of 3A According to a first embodiment variant, the cutting disk 34 is clamped between the outer rotors 18 and rotates with them. Alternatively, it is clamped between the two housing parts 6, 14 or generally held stationary (rotatably) on the housing 4, so that in this embodiment variant, for example, it does not rotate.

As already explained above, the cutting disk 34 is preferably arranged loosely, so that it is not forcibly guided or held by any of the pump components inner rotor 20, outer rotor 18, drive shaft 22, housing 4.

The design with the cutting disk 34 results in a structurally simple structure using a simple perforated disk, which can also be mounted in a simple manner.

Another advantage of such a simple cutting disk 34 is that - depending on the application - it can also be dispensed with, so that a second type of pump can be formed, in which the two pump units 16A, 16B and in particular their individual pump chambers are fluidly connected to one another , so that they essentially form a combined, common pump unit. This situation is in 4A shown.

As can be seen, the cutting disk 34 is omitted and the two pump units 16A, 16B lie directly against one another. All other components of the gerotor 2 are preferably still identical. As part of a modular system, two different types of pumps can be created using identical parts. The two suction openings 8A, 8B can, for example, be brought together onto a common suction connection via an additional adapter (not shown here).

The gerotor 2 shown in the figures is used in particular in motor vehicles and in particular as an oil pump. Suction lines lead via the two suction openings 8A, 8B or the suction ports connected thereto to different locations, in particular a common suction space, such as an oil pan, and suck the fluid F from this at different positions. This ensures a reliable fluid supply even in different driving situations of the motor vehicle.

In other applications where only one suction connection is required, the pump type is determined according to 4A used, for example with the previously described adapter, which brings the two suction openings 8A, 8B together into a common suction opening.

The design and arrangement of the cutting disk 34 in the different variants is also based on the cross-sectional illustrations 1 B , 2 B , 3B to recognize. The 1 B , 2 B show the arrangement of the cutting disk 24 concentric to the drive shaft 22 and thus to the inner rotor 20. 3B In contrast, shows the arrangement of the cutting disk 34 concentric to the eccentric axis 30 and thus to the outer rotors 18.

The cross-sectional representations each show a view in the direction of view along the axial direction 12 and thus in the direction of the motor-side housing part 14. What can be seen in particular are the drive shaft 22 with the shaft axis 24, the inner rotor 20 with its outer teeth and the outer rotor 18 with its inner teeth are shown in dashed lines.

The invention has been explained in more detail here in connection with the exemplary embodiments and in particular in connection with a gerotor pump. It is not necessarily limited to such a gerotor pump and not to the exemplary embodiments shown in the figures. In principle, it is also possible to apply the principles described here to other gear pumps.

Reference symbol list

2

gerotor

4

Housing

6

Lid

8A

first suction opening

8B

second suction opening

10

Pressure opening

12

Axial direction

14

another housing part

16A

first pump unit

16B

second pump unit

17

Engine part

18

external rotor

20

inner rotor

22

drive shaft

24

shaft axis

26A

first channel

26B

second channel

28

Collection room

30

eccentric axis

32

third channel

32A

first canal section

32B

second canal section

34

cutting disc

36

central hole

38

Channel opening

F

Fluid

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102021207694 [0005]
• WO 2022/037569 A1 [0006]

Claims (16)

Electric gear pump for a motor vehicle for pumping a fluid (F) such as oil, in particular a gerotor pump, which extends in an axial direction (12), with a housing (4) which has a cover-side housing part (6) and in which two Pump units (16A, 16B) are arranged, which follow one another in the axial direction (12) and are driven by a common drive shaft (22) which extends in the axial direction (12) along a shaft axis (24), with between the two pump units (16A, 16B) a partition is formed, characterized in that the partition is designed as a separating disk (34). Gear pump according to the preceding claim, characterized in that the cutting disk (34) is a separate component. Gear pump according to the preceding claim, in which the separating disk (34) is arranged loosely between the two pump units (16A, 16B). Gear pump according to one of the preceding claims, characterized in that the two pump units (16A, 16B) each have a gear set with an externally toothed inner rotor (20) and an internally toothed outer rotor (18). Gear pump according to one of the preceding claims, characterized in that the cutting disk (34) is arranged concentrically to the inner rotors (20). Gear pump according to the preceding claim, characterized in that the cutting disk (34) is attached to the drive shaft (22) in a rotationally fixed manner and/or that the cutting disk (34) is arranged between the two inner rotors (20) and in particular is clamped, so that the cutting disk (34) rotates, preferably together with the drive shaft (22). Gear pump according to one of the preceding claims, characterized in that the cutting disk (34) has a radial extension which does not protrude beyond the outer circumference of the outer rotors (18) in the radial direction. Gear pump according to one of the Claims 1 until 4 or after Claim 7 , characterized in that the cutting disk (34) is arranged concentrically to the outer rotors (18). Gear pump according to the preceding claim, characterized in that the cutting disk (34) is arranged and in particular clamped between the outer rotors (18) and preferably rotates with them during operation. Gear pump according to one of the preceding claims, characterized in that the cutting disk (34) extends in the radial direction into the housing (4) and preferably has at least one channel opening (38) through which a flow path for the fluid (F) is passed . Gear pump according to one of the preceding claims, characterized in that two connection openings (8A, 8B), in particular suction openings, are provided on the cover-side housing part (6) at the front for parallel delivery of the fluid (F) to be pumped via the two connection openings (8A, 8B). are and a first channel (26A) is formed, which leads to the first pump unit (16A) and a second channel (26B) is formed, which leads to the second pump unit (16B). Gear pump according to the preceding claim, characterized in that the first channel (26A) opens on the front side of the first pump unit (16A) and the second channel (26B) is guided past the two pump units (16A, 16B) radially on the outside and on the cover side Housing part (6) opens on the opposite end face of the second pump unit (16B). Gear pump according to one of the two preceding claims, characterized in that a further connection opening (10) is formed on the cover-side housing part (6), in particular a pressure opening, which is preferably connected to both pump units (16A, 16B). Gear pump according to the preceding claim, characterized in that a third channel (32) is formed, which is connected to the further connection opening (10) and which is divided into two channel sections (32A, 32B), one of the channel sections (32A). the first pump unit (16A) and the other leads to the second pump unit (16B), the second channel section (32B) preferably being guided radially on the outside past the two pump units (16A, 16B) and on the one opposite the cover-side housing part (6). Front side of the second pump unit (16B) opens. Gear pump according to one of the preceding claims, characterized in that the housing (4) has the cover-side housing part (6) and a motor-side housing part (14), and the separating disk (34) between these two Housing parts (6, 14) is clamped and forms a fixed housing wall which is arranged between the two pump units (16A, 16B). Set consisting of at least two electric gear pumps, both gear pumps being designed according to one of the preceding claims, with the exception that one of them does not have the cutting disk (34), the two gear pumps preferably consisting of identical parts.

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