DE102019118697A1 - Gear pump - Google Patents

Abstract

The invention relates to a gear pump (Z) in the form of an internal gear pump or a toothed ring pump or gerator pump, with an internal gear (2) and an internal gear (3) driven via a drive shaft (1), the axis (2a) of the internal gear ( 2) is arranged coaxially to the axis (3a) of the internal gear rim (3), and that the inner gear wheel (2) and the internal gear rim (3) are arranged in the axial direction between two housing parts (7.1, 7.1b, 7.2), the housing parts (7.1, 7.1b, 7.2) are directly or via at least one part (4) arranged between them, in particular in the form of a ring, materially connected to one another or that the housing parts (7.1, 7.1a, 7.2) by means of at least one elastic and / or resilient Part (41) are pressed against each other.

Description

State of the art

Gear pumps or gerotor pumps are widely used for medium to high flow rates. In the pressure range, the gear pump is limited due to the large number of gap seals; in some cases, multi-stage pumps are used where the pressure load per pump is lower. Gear pumps are mostly used for applications with a pressure of up to 300 bar.

Gear pumps are mostly driven by electric motors. It is widespread here to provide a series connection, ie to design the electric motor and pump separately, with a common drive shaft as in FIG DE 102017106927 A disclosed with a clutch to use. This requires a lot of installation space, which is disadvantageous in particular when used in a unit with limited space, such as an integrated brake system or a transmission control. Furthermore, with this arrangement the motor axis is rigidly connected to the pump shaft without a coupling, which results in extremely small tolerances or tension in the bearing. Furthermore, the pump is mounted in the pump housing with many parts that require small tolerances in order to keep the leakage-relevant gaps small.

DE 2015017074 shows a pump with a separate drive shaft for the pump and just as many parts, the tolerances of which are small and thus high production costs. To reduce the axial gap, additional pressure compensation plates are provided here.

DE 102012212686 also shows a separate drive shaft for the pump with sliding bearings. Here, too, determine the axial play 4th Parts, the tolerances of which have to be coordinated, usually by laborious pairing of parts.

Out WO 01/42069 a small motor-pump unit is previously known in which the pump is arranged essentially within the rotor or the rotor. With this arrangement, however, the size of the pump is limited to the size of the rotor and the motor mounting and the arrangement of the motor angle sensor are complex.

Out DE 4113373 a fuel pump for low pressure levels of less than 10 bar is known, with the pump mounting in a type of flange, but without a connection to a hydraulic block with control valves. In addition, the suction and pressure connections are not located together in the bearing flange. The medium to be pumped flows around the motor, which prevents the pump from being used as a high-pressure pump.

The construction of a gear pump is made more difficult and complex if it is to act on two hydraulic circuits, as in WO 2012/103925 , DE 102014212538 and DE 102014117189 disclosed.

As mentioned at the beginning, the pressure range and also the degree of efficiency depend on the number of sealing surfaces to be sealed, which are dependent, among other things, on the play between the teeth of the intermeshing gears and the play or distance between the inner wall of the housing and the tooth tips that guide along it. The tightness between the gears and the axially adjacent housing walls is also important. The larger the axial gap between the housing and the gear, the lower the performance and the maximum possible pressure that can be achieved.

The storage of the rotating parts also incurs significant costs. This is problematic, for example, if the motor and pump are designed separately.

The object of the present invention is to further develop a gear pump in such a way that it is less complex.

This object is achieved according to the invention with a gear pump having the features of claim 1. Advantageous configurations of these gear pumps result from the features of the subclaims.

The gear pumps according to the invention are advantageously distinguished by a few parts with small necessary tolerances. In addition, the gear pump according to the invention can be produced as a, in particular closed, structural unit and can be easily and easily integrated or installed in a wide variety of units.

By appropriately designing the mounting of the inner gear, in particular on the drive shaft, the inner ring gear and the possibly necessary outer ring, only a few dimensions with small tolerances have to be provided. Optimally, only one tolerance has to be considered. The aforementioned parts preferably form a structural unit which can be installed in a housing or a recess in a housing part. In addition, the remaining parts such as the inner gear, the inner ring gear and, if required, the sickle must be designed in such a way that they can be produced very inexpensively with small tolerances using flat grinding or, for example, cold extrusion.

Furthermore, by means of a corresponding design, it is possible for the outer ring to be welded to the outer disks or the outer disk to a cup-shaped part which receives the inner gear and the inner ring gear. A material connection can be dispensed with if the elements of the gear pump are compressed in the axial direction by means of an elastic part, such as a ring made of elastic material or a spring. Corresponding forces must be exerted here so that the gear pump is correspondingly tight at the pressures to be generated.

For this it is necessary that the inner wheel is driven with a wedge or pin via the drive shaft. The gear pump is preferably used to support the drive shaft. The drive shaft can be supported entirely or only partially by the gear pump.

Furthermore, the gear pump can be arranged or mounted within the drive housing in its bearing flange or in a separate housing.

The drive housing with the gear pump arranged therein can be attached to a hydraulic block with additional hydraulic components, such as valves, and to an electronics housing or directly to the electronics housing without a hydraulic block. This means that the electrical connections between the electronics housing and the drive or the gear pump, in particular for the stator winding and the motor sensor, can be made simple.

The gear pump can be designed as a 1-stage as well as a multi-stage, in particular two-stage, gear pump. A two-stage gear pump can be formed by a series connection of two single-stage gear pumps. A compact unit with a small installation volume is thus possible.

The gear pump can either be an internal gear pump or a gerotor pump, which is also called a gerator pump.

Various possible embodiments are conceivable. Some possible embodiments are briefly described below. However, this list is not exhaustive. All embodiments have in common that the gear pump has an internal gear driven by a drive shaft and an internal gear, the axis of the internal gear being arranged coaxially to the axis of the internal gear, and that in the axial direction at least on one side next to the internal gear and the internal gear an outer disk is arranged.

In a first possible embodiment, the gear pump is designed as an internal gear pump or as a gerotor pump, the internal gear rim being encompassed by an outer part, e.g. in the form of a ring, the at least one outer disk being firmly connected to the outer part.

In a second possible embodiment, the gear pump is designed as a toothed ring pump, with the at least one outer disk being materially connected to the inner ring gear.

In the context of the invention, an integral connection is understood to mean a welded, soldered or glued connection.

In a further possible embodiment of the gear pump according to the invention in the form of an internal gear pump or gerotor pump, this has an internal gear driven via a drive shaft and an internal gear rim, an outer disk being arranged in the axial direction at least on one side next to the internal gear and the internal gear rim. When the gear pump is installed, at least one elastic and / or resilient part, in particular in the form of a ring made of elastic material, generates a force in the axial direction on an outer disk and / or a cup-shaped part that accommodates the inner gear and the inner ring gear. The part can lie in a circular groove of an outer disk and / or a groove of the cup-shaped part arranged in the flat outer side and be supported on a side surface of an adjacent part, such as the housing of a hydraulic block.

For all of the aforementioned embodiments, the outer part is a sleeve, a cup-shaped part, a bearing, in particular in the form of a roller or ball bearing, or a wall, in particular a housing flange with a recess.

Particularly preferably, the drive shaft, the inner gear, the inner ring gear and the two outer disks or the one outer disk and the cup-shaped part form a composite or a structural unit. If the gear pump also has an outer ring and / or a radial bearing for the inner ring gear, these parts also belong to the structural unit or the module.

Chamfers and / or recesses are advantageous in order to realize a material connection of two parts with one another without interfering with the installation or assembly of the gear pump to be provided in the radial outer wall of the corresponding parts. The turfs or recesses of the parts to be connected are to correspond to one another, ie to be provided on the opposite edges of the parts. In particular, these can be designed to run around. Gear pump according to one of the preceding claims, characterized in that the internal gear ( 2 ) arranged tiltable to the drive shaft (1), in particular by means of an elastic and / or flexible connection to the drive shaft ( 1 ) is coupled.

The inner gear can preferably be mounted in a tiltable manner relative to the drive shaft, so that tolerances and play between the drive shaft and the inner gear or the inner ring gear can be compensated for. A part made of elastic and / or flexible material can also be arranged between the toothed wheel and the drive shaft to compensate for tolerances and play.

Figure list

Various possible embodiments of the invention are explained in more detail below with reference to drawings.

• 1: eine erste mögliche Ausführungsform einer Zahnradpumpe einer erfindungsgemäßen Druckversorgungseinrichtung, wobei die Zahnradpumpe als 1-stufige Zahnradpumpe ausgebildet ist, und die Antriebswelle u.a. über das innere Zahnrad der Zahnradpumpe gelagert ist;
• 1a: einen Schnitt durch die Innenzahnradpumpe gemäß 1;
• 1b: einen Schnitt durch den Bereich der Zahnradpumpe gemäß 1, in dem die feststehenden äußeren Teile der Zahnradpumpe miteinander verschweißt sind;
• 1c: eine leicht abgewandelte Ausführungsform der Zahnradpumpe gegenüber der in 1a gezeigten Ausführungsform mit geschlitzter Sichel und deren Lagerung über einen Bolzen;
• 2: eine Ausführungsform der Zahnradpumpe mit einem Kugellager zwischen Innenzahnkranz und äußerem Ring, wobei die Antriebswelle in der Zahnradpumpe ebenfalls über das innere Zahnrad gelagert ist;
• 3: eine Ausführungsform, bei der die Antriebswelle mittels Wälzlager in der Zahnradpumpe gelagert ist;
• 4: eine Motorlagerung sowohl im Antriebsgehäuse als auch in der Zahnradpumpe, wobei das erste Lager mit magnetischer Verspannung ausgebildet ist und das zweite Lager in der Zahnradpumpe angeordnet ist;
• 4a: eine Motorlagerung mit beiden Lagern in der Zahnradpumpe;
• 5: eine Montagevorrichtung für eine erfindungsgemäße Zahnradpumpe.

Show it:

• 1 : a first possible embodiment of a gear pump of a pressure supply device according to the invention, wherein the gear pump is designed as a 1-stage gear pump and the drive shaft is supported, among other things, via the internal gear of the gear pump;
• 1a : a section through the internal gear pump according to 1 ;
• 1b : a section through the area of the gear pump according to 1 in which the fixed outer parts of the gear pump are welded together;
• 1c : a slightly modified embodiment of the gear pump compared to that in 1a embodiment shown with a slotted sickle and its mounting via a bolt;
• 2 : an embodiment of the gear pump with a ball bearing between the inner ring gear and the outer ring, the drive shaft in the gear pump also being supported via the inner gear;
• 3 : an embodiment in which the drive shaft is mounted in the gear pump by means of roller bearings;
• 4th : a motor bearing both in the drive housing and in the gear pump, the first bearing being designed with magnetic tension and the second bearing being arranged in the gear pump;
• 4a : an engine mount with both bearings in the gear pump;
• 5 : a mounting device for a gear pump according to the invention.

The 1 and 1a show a possible embodiment of an internal gear pump with a drive shaft 1 , inner gear 2 , Internal ring gear 3 , Guide part in the shape of a sickle 5 with the latter over the bolt 6th with the outer panes 7.1 and 7.2 connected and thus fixed. The aforementioned parts are in the two outer panes 7.1 and 7.2 together with the outer ring 4th embedded, with the outer ring 4th with the two outer panes 7.1 and 7.2 by welding LS is connected to what magnifies in 1b is shown. The two outer panes 7.1 and 7.2 form together with the outer ring 4th the pump housing ZG the gear pump Z , which in the recess 18b the wall 18th is stored. The wall 18th forms a flange on or with which the drive housing can be fastened to the hydraulic housing.

In 1b it is shown that the outside diameter is the one for the weld LS provided areas 7.1a, 7.2a and 4a of the outer panes 7.1 , 7.2 and the outer ring 4th smaller than the largest outer diameter D _{A of} the parts, so that the assembly in the recess 18b which can be formed by means of a bore, not through the weld seam LS is hindered. The assembly and adjustment of these parts is described in 6th described.

The gap or play between the rotating inner gear is decisive for the losses due to leakage flow 2 and the internal ring gear 3 to the gear pump housing ZG what through the outer panes 7.1 and 7.2 and above all by the outer ring 4th is formed. The disks can be flat-ground 7.1 , 7.2 and the outer ring 4th Manufacture very precisely so that small gaps or clearances are possible.

The inner gear 2 is on the drive shaft 1 through the short collar 11 guided. This has the advantage that there are small angular tolerances between the gear 2 and wave 1 not to jamming of the gear 2 in the housing ZG to lead. The torque to the gear 2 is via a driver 10 transfer. This torque is also used by the locking bolt 9 on the wall or the flange 18th transfer. At the front, both suction and pressure connections act with seals, which are connected to the hydraulic housing HCU are connected.

The outer pane 7.2 is with a seal 14th to the hydraulic housing HCU Mistake. The shaft seals also work 13.1 and 13.2 . The drive shaft 1 still has a shaft journal 8th , which is used to assemble the pump housing ZG , s. 6th , is required. To reduce the friction caused by the pressure forces on the internal gear rim 3 can between this and the outer ring 4th a roller bearing, needle or ball bearing 17a , please refer 2 , to be built in.

The 1a shows the gear pump Z on average. The so-called sickle plays an important role in the sealing function 5 to which one here is one-piece with central bearing 6th is executed. Here act on the sickle 5 the compressive forces of the enclosed areas. The sickle 5 is here on a peg 6th centrally stored, as is known from the prior art. In the 1a are also the connections for suction S. and the pressure output with pressure P shown with direction of rotation. Of course, the direction of flow changes as soon as the gear wheel 2 rotates in the other direction, causing the suction side S. to the pressure outlet P and vice versa.

As in 1c illustrated, it is also possible to use the sickle 5 by fixing on both sides 6a To design 6b in two parts without a shaft with a compensating spring, which results in an even better sealing function. The pressure equalization can be achieved through recesses on the sickle 5 and also axially to the outer discs 7.1 and 7.2 be optimized.

Instead of the internal gear pump, a gerotor pump can also be used, which does not have a sickle and a fixed internal gear rim. The inner gear is mounted eccentrically on an eccentric driven by the drive shaft and rolls off in the stationary inner ring gear. A trochoidal tooth system is preferred as the tooth system. The leakage oil must be diverted to S via the leakage flow channel in order to relieve the seals.

The 2 shows the same structure of the gear pump Z according to 1 , with the difference of a sliding bearing on both sides 16 the drive shaft 1 in the two outer panes 7.1 and 7.2 . This eliminates the need for a separate motor mount, as is the case in the 6th and 6a are shown. The leakage oil channels 15th are modified here.

The 3 also shows the similar structure of the pressure supply device according to FIG 1 and 2 , with the difference in the use of roller bearings 17th to minimize bearing friction. In addition, the outer pane 7.1 and the outer ring 4th replaced by part 7.1b, which is cup-shaped and the inner gear 2 as well as the internal ring gear 3 records. In this training there is only one weld seam LS required, which is part 7.1b and the outer pane 7.2 materially connects.

The 4th shows a representation of the entire unit consisting of the motor 22nd , Pump Z , HCU and ECU which is able to perform pressure regulation and control for systems such as brakes, gears, etc. The main focus here is on the combination of motor and pump. In the bearing flange 18th is like in the 1 to 3 shown, the pump arranged or in a separate pump housing 40 as shown in the upper half of the picture HCU or ECU attached. In 4th is the simplest version accordingly 1 shown which an additional engine mount 20th needed in which the shaft 1 is stored. As usual, the motor consists of a rotor 21st , which over the driver 10a with the wave 1 connected is. The rotor 21st is via a permanent magnet in the housing 30th axially preloaded by its force. This is a solution for the motor manufacturer, which motor with housing 22nd and stator and winding 23 manufactures, tests and delivers to the system supplier. Here the motor is tested without a pump with an auxiliary shaft. Then, when the shaft is removed, the rotor is centered by the axial magnetic force, so that the shaft can then be used during final assembly 1 can be assembled with the rotor. The drive housing must also be connected to the flange 18th at 25a - shown in the lower half of the picture - put together and attached, e.g. B. with springs, which are attached in segments over three connections. There is also a housing seal here 31 necessary. The fastening can be done by caulking, at 25th of motor flange with HCU or ECU , see upper half of the picture 28 , respectively. The pump version with pump housing is shown here. The motor is shown here as a brushless motor that needs a motor sensor for commutation and control of the volume delivery of the pump. This motor sensor is remote from the drive housing 22nd arranged, with a sensor shaft 26th , which on the drive shaft 1 is arranged or attached, a sensor target 27 wearing. This target 27 acts on the sensor element 28 , which is on the circuit board of the ECU is arranged. The winding is via contact bars 24 with the ECU connected.

The motor with a bearing flange 18th can be connected directly to the hydraulic housing HCU , which contains valves or other hydraulic components, are connected to the pump. If this is not the case, the drive housing can be connected 22nd , 18th directly to the housing of the ECU at.

It is also possible to use the gear pump Z in a pump housing 40 to arrange which directly with hydraulic housing HCU connected becomes like it in 4th in the upper half of the drive shaft 1 is shown. Before assembling the pump housing 40 and hydraulic housing HCU or pump housing 40 and ECU is first the gear pump Z in the pump housing 40 integrated or mounted, then the rotor 21st on the wave 1 pressed on and then with the bearing 20th is assembled. Here the pulling force of the magnet 30th additionally on the rotor 21st and the camp 20th act, making the bearing look like a four-point bearing. So that is the motor housing 22nd with the gear pump Z and their pump housing 40 and can be connected to the hydraulic housing in the next step HCU or the electronics housing ECU get connected. This is done using the fastening screw 41 used. The wave 1 is previously in the outer panes 7.1 and 7.2 centered so that the pump housing 40 before screwing it to the hydraulic housing HCU or the electronics housing ECU with the wave 1 is centered.

The pressure supply device according to 4a uses a 2-stage pump with long plain or roller bearings accordingly 2 and 3 which does not require separate engine storage. Accordingly, the motor structure with the housing is simplified. The rotor 21st sits with driver 10a on the motor shaft and is axially connected to the locking ring. The pump housing protrudes slightly into the here HCU inside.

The 5 shows the assembly device for welding the panes 7.1 and 7.2 together with the outer ring 4th . A sleeve is used for this 37 pushed over the drive shaft and axially fixed with the locking ring. Then over the centering sleeve 35 the disks 7.1 , 7.2 and outer ring centered. Be on the opposite side with the mother 34 over the mounting washer 33 the disks 7.1 , 7.2 axially clamped together with the outer ring. After removing the centering sleeve, laser welding can then preferably be carried out LS will. For this purpose, the sleeve is clamped in a rotatable manner. As 1b shows, the diameter of the weld is smaller, so that the subsequent assembly in the flange is not hindered.

List of reference symbols

1

drive shaft

1b

End of the drive shaft

2

Internal gear (toothed ring)

3

Internal ring gear

4th

Outer ring

5

Guide part (sickle)

5a

2-part sickle

5b

Balancing spring

6th

Fixation of the sickle

6a

Alternative fixation

7.1

Outer pane 1

7.2

Outer pane 2

8th

Threaded stud

9

Anti-twist device

10

Carrier

10a

Driver to the rotor

11

Leader tape

12

waves

13.1

poetry

13.2

poetry

14th

Outer pane seal

15th

Leakage flow channel

16

bearings

17th

roller bearing

17a

roller bearing

18th

Wall of the drive housing, which is designed as the first housing part of the motor housing, in particular as a bearing flange or side wall

18b

Recess in the side wall

18f

window-like recess for drive shaft

18k

channel

19th

Center disk

20th

Engine mount

21st

rotor

21a

stator

22nd

Motor housing

23

Motor winding

24

Motor contacting

25th

Housing mounting

25a

alternative housing mounting

26th

Sensor shaft

27

Target

28

Sensor element on circuit board

29

Locking ring

30th

Housing with magnet

31

Housing seal

32

Brush DC motor

33

Mounting washer

34

mother

35

Centering sleeve

36

Moment support

37

Sleeve

38

Locking ring

39

roller bearing

40

Pump housing

41

Fastening screw

45

Side wall of the hydraulic housing

46

Recess in the side wall 46 of the hydraulic housing

48

Channel for electrical cables

B.

Axial width of the inner gear 2

D.

poetry

S.

Suction connection with seal

P

Pressure connection with seal

LS

Laser welding

HCU

Hydraulic block

HCU _S1 ,

side of the hydraulic housing facing the drive housing

HCU _S2

the side of the hydraulic housing facing the electronics housing

ECU

electronic control unit

Sa, Pa

Orifices of the channels S. and P

Z

Gear pump

ZG

Gear pump housing

QUOTES INCLUDED IN THE DESCRIPTION

This list of the 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.

Patent literature cited

• DE 102017106927 A [0002]
• DE 2015017074 [0003]
• DE 102012212686 [0004]
• WO 0142069 [0005]
• DE 4113373 [0006]
• WO 2012/103925 [0007]
• DE 102014212538 [0007]
• DE 102014117189 [0007]

Claims (47)

Gear pump (Z) in the form of an internal gear pump or a gerotor pump or gerator pump, with an internal gear (2) driven by a drive shaft (1) and an internal gear (3), the axis (2a) of the internal gear (2) being coaxial to the Axis (3a) of the internal gear rim (3) is arranged, and that the inner gear wheel (2) and the internal gear rim (3) are arranged in the axial direction between two housing parts (7.1, 7.1b, 7.2), the housing parts (7.1, 7.1 b, 7.2) are connected to one another directly or via at least one part (4) arranged between them, in particular in the form of a ring, or that the housing parts (7.1, 7.1a, 7.2) by means of at least one elastic and / or resilient part (41) are pressed against each other. Gear pump (Z) Claim 1 , characterized in that in the axial direction at least on one side next to the inner gear (2) and the inner ring gear (3) an outer disk (7.1, 7.2) is arranged, which forms a housing part of the gear pump (Z), with a) when training the gear pump (Z) as an internal gear pump, the internal gear rim (3) is encompassed by an outer part (4), the at least one outer disk (7.1, 7.2) being firmly connected to the outer part (4), or that b) when the Gear pump (Z) as a gerotor pump either - the internal gear rim (3) is encompassed by an outer part (4), in which case the at least one outer disk (7.1, 7.2) is firmly connected to the outer part (4) or - the internal gear rim ( 3) itself is firmly connected to the at least one outer pane (7.1, 7.2). Gear pump (Z) Claim 1 or 2 , characterized in that the cohesive connection is a welded, soldered or adhesive connection. Gear pump (Z) Claim 1 or 2 , characterized in that an outer disk (7.1, 7.2) is arranged in the axial direction at least on one side next to the inner gear (2) and the inner ring gear (3), with at least one elastic and / or elastic disk in the installed state of the gear pump (Z) The resilient part (41), in particular in the form of a ring, exerts a force (Fa) in the axial direction on an outer disk (7.1, 7.2) and / or a cup-shaped part (7.1b) which accommodates the inner gear (2) and the inner gear rim (3) ) exercises. Gear pump (Z) Claim 4 , characterized in that the part (41) rests in a circular groove (7.2a) of an outer disk (7.2) or a groove (7.1bn) of the cup-shaped part (7.1b) arranged in the flat outer side (7.2a) and is supported on a side surface of an adjacent part (46). Gear pump (Z) according to one of the preceding claims, characterized in that the outer part (4) is a ring, a sleeve, a cup-shaped part (7.1b) or a bearing (17a). Gear pump (Z) according to one of the preceding claims, characterized in that the combination of drive shaft (1), the inner gear (2) and the internal gear rim (3), as well as the housing parts (7.1, 7.1b, 7.2) and, if required, the outer part (4) form a structural unit or a module. Gear pump (Z) Claim 7 , characterized in that the composite is in a sleeve, a cylindrical recess (18b) of a part, in particular in the form of a housing wall (18) of a motor, a motor flange, a pump housing (40) and / or a housing (HCU) for hydraulic units, is arranged. Gear pump (Z) after one of the Claims 1 to 8th , characterized in that a disk (7.1, 7.2) is arranged in each case in the axial direction on both sides of the inner gear (2) and of the inner ring gear (3). Gear pump (Z) Claim 9 , characterized in that the two disks (7.1, 7.2) and the inner ring gear (3) or the outer ring (4) have outer diameters of the same size. Gear pump (Z) after one of the Claims 1 to 10 , characterized in that the adjoining outer radial edge areas (7.1a, 7.2a, 3a) of the two disks (7.1, 7.2) and the inner ring gear (3) or the outer part (4) are connected to one another, in particular welded, soldered or are glued. Gear pump after Claim 11 , characterized in that at least one outer radial edge area (7.1a, 7.2a, 3a, 4a) is formed by a bevel, which is used in particular for welding or soldering. Gear pump according to one of the preceding claims, characterized in that the gear pump is an internal gear pump, in which a sealing element (5), in particular in the form of a sickle, is arranged between the internal gear (2) and the internal gear rim (3). Gear pump after Claim 13 , characterized in that the sickle (5) is displaceable in of the gear pump (Z), in particular between two bearing parts or fixings (6, 6a). Gear pump after Claim 13 or 14th , characterized in that the sickle (5) is in one or two parts (5a, 5b). Gear pump according to one of the Claims 13 to 15th , characterized in that the sickle (5) by means of an adjusting mechanism (6, 6a), in particular in the form of a spring or a rotatable part (5b), in particular in the form of an eccentric, which is designed as a pin, relative to the internal gear (2) is adjustable or lockable. Gear pump according to one of the Claims 13 to 16 , characterized in that the sickle (5), in particular its contact surface to the inner gear (2), and / or the teeth of the inner gear (2) at their outer radial ends, depressions, in particular in the form of grooves, which are in particular in Extend circumferential direction, have to equalize pressure. Gear pump (Z) according to one of the preceding claims, characterized in that, in the case of the toothed ring pump, a part (42) driven by a drive shaft (1) and rotatably mounted about an axis (A1), the axis of rotation (A2) of the inner gear (2) is arranged eccentrically to the axis (A1). Gear pump (Z) according to one of the preceding claims, characterized in that the internal gear (2) is arranged tiltable to the drive shaft (1), in particular is coupled to the drive shaft (1) by means of an elastic and / or flexible connection. Gear pump (Z) according to one of the preceding claims, characterized in that the internal gear (2) has a maximum axial width (B), the axial length of the contact surface with which the internal gear (2) rests on the drive shaft (1), is shorter than the maximum axial width (B) and / or that a part made of elastic and / or flexible material is arranged between the gear wheel (2) and the drive shaft (1) to compensate for tolerances. Pressure supply device with an electric motor drive (21, 21a) arranged in a drive housing (18, 22) with a stator (21a) and a rotor (21), as well as a gear pump (Z) driven by the drive (21, 21a) according to one of the previous claims. Pressure supply device according to Claim 21 , characterized in that the inner gear (2) of the gear pump (Z) is coupled to the rotor (21) directly or via a clutch and / or a gear, with a wall (18) between the rotor (21) and the gear (2) is arranged, and that at least one seal (13.1) is arranged between the rotor (21) and the gearwheel (2) in such a way that the rotor (21) is a dry-running rotor (21) which is not different from that of the gearwheel ( 2) the conveyed medium flows around and / or is surrounded. Pressure supply device according to Claim 22 , characterized in that the drive housing (18, 22) has a side wall (18a, 40) on which the gear pump (Z) is arranged or in which, in particular in a recess (18b), the gear pump (Z) at least partially or fits completely. Pressure supply device according to one of the Claims 21 to 23 , characterized in that the drive (21, 21a) rests on a hydraulic housing (HCU) with at least one valve and / or hydraulic lines or channels arranged therein or forms a unit with this Pressure supply device according to Claim 24 , characterized in that the gear pump (Z) rests in the recess (18b) of the side wall (18) or in an, in particular cup-shaped, pump housing (40) which is attached in particular to the hydraulic housing (HCU), or both in the recess (18b) of the side wall (18) or in a pump housing (40) and also in a recess (45) of the hydraulic housing (HCU), the openings of the recesses (18b, 41) facing each other. Pressure supply device according to one of the Claims 21 to 25th , characterized in that the recess (18b) is open towards the hydraulic housing (HCU), in particular is cup-shaped. Pressure supply device according to one of the Claims 21 to 26th , characterized in that at least one seal (D, 31a) is arranged in the side wall (18) and / or in a first hydraulic housing side wall (46) corresponding to the side wall (18). Pressure supply device according to one of the Claims 21 to 27 , characterized in that the gearwheel (2) is non-rotatably connected to the drive shaft (1) by means of a force-fit connection or by means of a form fit, which is formed in particular by means of a pin or serration. Pressure supply device according to one of the Claims 21 to 28 , characterized in that the gear pump (Z) a Internal gear pump with, in particular, a permanently arranged sickle (5), an external gear pump or a gerotor pump. Pressure supply device according to one of the Claims 21 to 29 , characterized in that the internal gear pump (Z), in addition to the gear (2), which is designed as an inner gear, also has an outer internal gear (3) and a sickle (5), the rotor (21) with the inner gear ( 2) is coupled by means of a drive shaft (1) directly, via a coupling and / or via a transmission. Pressure supply device according to one of the Claims 21 to 30th , characterized in that the drive shaft (1) is either a) in the drive housing (22) on the one hand, and in the gear pump (Z) and / or in the hydraulic housing (HCU) on the other hand, or b) only in the gear pump (Z) or c) in the hydraulic housing (HCU) and in the drive housing (22) or d) in the gear pump (Z) and in the hydraulic housing (HCU) or is supported by means of suitable bearings, in particular radial bearings and / or axial bearings. Pressure supply device according to one of the preceding claims, characterized in that the drive shaft (1) is non-rotatably connected to the rotor (21). Pressure supply device according to one of the Claims 21 to 32 , characterized in that the side wall (18) has a window-like opening (18f), in particular in the form of a bore, through which the drive shaft (1) extends, an annular seal (13.1) surrounding the drive shaft (1) for sealing the window-like opening (18f) is used. Pressure supply device according to one of the Claims 21 to 33 , characterized in that the side wall (18) or the first housing part (18) is designed as a bearing flange and is fastened or can be fastened to the hydraulic housing (HCU) by fastening means, in particular screws. Pressure supply device according to one of the Claims 21 to 34 , characterized in that a control and regulating device (ECU) with its housing (ECU _G ) is arranged on the side (HCU _S2 ) of the hydraulic housing (HCU) opposite the first hydraulic housing side (HCU _S1 ). Pressure supply device according to Claim 35 , characterized in that the drive shaft (1) or a part (26) arranged thereon extends into the hydraulic housing (HCU), in particular as far as its opposite side (HCU _S2 ), or extends completely through the hydraulic housing (HCU). Pressure supply device according to Claim 36 , characterized in that the drive shaft (1) or a part (26) arranged thereon carries a target (27). Pressure supply device according to one of the Claims 21 to 37 , characterized in that the internal gear (2) has a maximum axial width (B), the axial length of the contact surface with which the internal gear (2) rests on the drive shaft (1) is shorter than the maximum axial width (B ) and / or the internal gear (2) is arranged tiltably on the drive shaft (1). Pressure supply device according to one of the Claims 21 to 38 , characterized in that the electrical connections (24) of the electrical drive (21, 23) are passed through a channel (18f) of the side wall (18) and a channel (48) of the hydraulic housing (HCU). Pressure supply device according to one of the Claims 21 to 39 , characterized in that the drive shaft (1) is mounted with its second end (1b) in the second housing (22). Pressure supply device according to one of the Claims 21 to 40 , characterized in that the gear pump (Z) is arranged wholly or partly next to the rotor (21) in the axial direction. Pressure supply device according to one of the Claims 21 to 41 , characterized in that the internal gear (2), the cup-shaped part (7.1b) and / or a bearing plate (7.1, 7.2) forms bearings for the drive shaft (1). Pressure supply device according to one of the Claims 21 to 42 , characterized in that the pressure supply device serves as a pressure source for a brake system and / or a transmission. Pressure supply device according to one of the Claims 21 to 43 , characterized in that several electric motors and gear pumps (Z) are arranged in a drive housing. Pressure supply device according to one of the Claims 21 to 44 , characterized in that several pressure supply devices are combined to form a module or structural unit. Pressure supply device according to one of the Claims 21 to 45 , characterized in that a bearing, in particular in the form of a ball or roller bearing, between the radial outer wall of the internal gear rim (3) and the outer ring (4) surrounding the internal gear rim (3) or the cylindrical inner wall of the cup-shaped part (40) be provided in order to keep the friction as low as possible. Brake system or transmission with a pressure supply device according to one of the preceding Claims 21 to 46 or with a gear pump according to one of the Claims 1 to 20th .

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