WO2017045799A1

WO2017045799A1 - Displacement pump, method for operating a displacement pump, steering system, and gearing

Info

Publication number: WO2017045799A1
Application number: PCT/EP2016/066655
Authority: WO
Inventors: Johann Kreutzer; Günter Lutz
Original assignee: Robert Bosch Automotive Steering Gmbh
Priority date: 2015-09-16
Filing date: 2016-07-13
Publication date: 2017-03-23
Also published as: DE102015115587A1; DE102015115587B4

Abstract

The invention relates to a displacement pump (10), in particular a vane pump for delivering a fluid for a fluid-consuming unit (6) of a motor vehicle, the cover (12) and/or the end plate (14) having a recess (32, 34) designed to supply the fluid current (F) to the delivery chamber (30) at least to some extent in an axial fashion. The invention further relates to a method for operating a displacement pump (10) and to a steering system (1) for a motor vehicle. The invention further relates to a gearing (100) for a motor vehicle.

Description

Description title

Positive displacement pump, method for operating a positive displacement pump,

Steering systems and transmissions

The invention relates to a positive displacement pump, in particular a

Vane pump for delivering a fluid for a consumer of a motor vehicle. The invention further relates to a method for operating the displacement pump, in particular the vane pump for conveying the fluid for the consumer of the motor vehicle. The invention also relates to a steering system for a motor vehicle. The invention further relates to a transmission for a motor vehicle.

State of the art

Vane pumps of known design are generally constructed such that a rotor rotates in a cam ring. The cam ring is completed by one side with a housing forming a face plate and a control plate. The cam ring has a to the axis of the rotor depending on the design coaxial or non-coaxial contour and forms a pump room. In the peripheral surface of the rotor are arranged substantially radially extending slots over the width thereof, in which radially displaceable wings are guided. Upon rotation of the rotor about its axis, the wings are guided along the contour of the cam ring, wherein between two adjacent wings chambers each of varying volume are formed.

According to the rotational movement of the rotor, a suction region and a pump pressure space or pressure region are formed, wherein the suction region in the region of increasing volume and the pressure range of the

Pump pressure chamber is arranged in the range of decreasing volume of the chambers. WO 96/13665 discloses a vane pump in which a suction channel is divided into two symmetrically arranged, curved suction arms guided to suction zones, which lie in an end wall of the housing.

In the case of pumps with a recessed ring in the suction region, in which suction takes place mainly via cam ring openings, this arrangement brings with it filling problems, since the radially sucked fluid impinges on a lateral surface of the rotor and is reflected back in the pulse. This leads to a supply blockage of the wing cell to be filled. Accordingly, the suction volume of the winged cell can not be effectively utilized.

The invention is therefore based on the object of specifying a displacement pump, in particular a vane pump for conveying a fluid for a consumer, which allows effective filling of the suction volume of the vane.

The object is with a positive displacement pump, in particular a

Vane pump for conveying a fluid for a consumer of a motor vehicle with the features of claim 1. Furthermore, the object is achieved with a method for operating a positive displacement pump, in particular a vane pump for delivering a fluid for a consumer of a motor vehicle having the features of patent claim 8. Moreover, the object is achieved with a steering system with the features of claim 11. Furthermore, the object is achieved with a transmission having the features of patent claim 13.

Disclosure of the invention

The present invention provides a displacement pump, in particular a vane pump for conveying a fluid for a consumer of a motor vehicle, wherein the lid and / or the end plate has a recess which is adapted to supply the fluid flow of the delivery chamber at least partially axially. The present invention further provides a method for operating a positive displacement pump, in particular a vane pump for delivering a fluid for a consumer of a motor vehicle, wherein the

Fluid flow of the delivery chamber via at least one, formed in the cover and / or the end plate recess is at least partially axially fed.

The present invention also provides a steering system with at least one consumer, and a positive displacement pump for delivering a fluid for the at least one consumer of the steering system.

The present invention further provides a transmission with at least one consumer, and a positive displacement pump for delivering a fluid for the at least one consumer of the transmission. One idea of the present invention is to supply the fluid flow of the delivery chamber at least partially axially by providing the recess formed in the cover and / or the end plate. Thereby finds one

Suction not only radially over the cam openings instead, but also axially over the formed in the lid and / or the face plate recess. Thus, advantageously an efficient filling of a respective

Delivery chamber of the working chamber of the positive displacement pump can be achieved.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to a further preferred embodiment, it is provided that the recess of the lid and / or the recess of the end plate in

Radial direction of the lid and / or the end plate is at least partially formed between the cam ring and a radial end portion of the lid and / or the end plate. Thus, the fluid flow

streamlined to be supplied to the recess formed in the lid and / or the face plate. According to a further preferred embodiment, it is provided that the recess of the cover and / or the recess of the end plate at least partially has an axial inclination, which extends from a surface of the lid and / or the end plate to one, to the at least one

Recess of the cam ring arranged adjacent feed region of the recess formed in the lid and / or formed in the end plate recess extends. Thus, advantageously at least partially axial delivery of the fluid flow from the

Feed region of the recess formed in the lid and / or the recess formed in the end plate can be achieved.

According to a further preferred development, it is provided that the axial inclination formed at least in sections in the cover and / or the end plate has an angle of inclination of up to 45 °, preferably of up to 30 °. Thus, the fluid flow to the feed area

be supplied streamlined.

According to a further preferred embodiment, it is provided that the recess of the lid and / or the recess of the end plate at least partially a first, concentric curvature and at least

Sectionally having a second curvature, which is adapted to deflect the fluid flow from an axial direction of the lid and / or the end plate in a radial direction of the lid and / or the end plate. By providing the second curvature which is adapted to

Redirecting fluid flow from the axial direction of the lid and / or the end plate in the radial direction of the lid and / or the end plate, the fluid flow through the second curvature favored in an efficient manner, the suction zone of the working chamber can be supplied.

According to a further preferred embodiment, it is provided that the recess of the cover and / or the recess of the end plate in the, adjacent to the at least one recess of the cam ring arranged feed region along the recess of the cam ring a third

Has curvature, which opens into the delivery chamber. By providing the third curvature, the fluid flow can advantageously the

Delivery chamber are at least partially fed axially.

According to a further preferred development, it is provided that the third curvature of the feed region opening into the delivery chamber

Recess of the lid and / or the recess of the end plate is adapted to supply the fluid flow of the feed chamber at least partially axially, wherein the fluid flow of the feed chamber can be fed at an angle of 0 to 90 °. Depending on the configuration of the third curvature, an angle can thus be advantageously determined in which the fluid flow is fed to the delivery chamber.

The described embodiments and developments can be combined with each other as desired.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Short description of the character

The accompanying drawings are intended to provide a further understanding of the

Embodiments of the invention mediate. They illustrate

Embodiments and in conjunction with the description serve to explain principles and concepts of the invention.

Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other. Show it:

Figure 1 is a longitudinal sectional view of a positive displacement pump for delivering a fluid for a consumer of a motor vehicle according to a preferred embodiment of the invention.

Figure 2 is a cross-sectional view of a portion of the displacement pump for delivering the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

Fig. 3 is a perspective view of the positive displacement pump for

Conveying the fluid to the consumer of the motor vehicle according to the preferred embodiment of the invention; Fig. 4 is a perspective view of the positive displacement pump for

Conveying the fluid to the consumer of the motor vehicle according to the preferred embodiment of the invention;

5 is a flowchart of a method for operating the

Positive displacement pump for delivering the fluid to the consumer of the motor vehicle according to the preferred embodiment of the invention;

Fig. 6 shows a steering system for a motor vehicle with the positive displacement pump for

Conveying the fluid to the consumer of the motor vehicle according to the preferred embodiment of the invention; and

Fig. 7 shows a transmission for a motor vehicle with the positive displacement pump for

Promotion of the fluid for the consumer according to the preferred embodiment of the invention.

In the figures of the drawings, like reference characters designate like or functionally identical elements, components or components, as far as nothing is concerned

The contrary is stated. Fig. 1 shows a longitudinal sectional view of a positive displacement pump for delivering a fluid for a consumer of a motor vehicle according to a preferred embodiment of the invention. The positive displacement pump 10 preferably has a pump housing 18. The

Pump housing 18 preferably has a cover 12 and an end plate 14.

In the pump housing 18, a cam ring 20 is inserted. Within the cam ring 20, a rotor 24 is further arranged, which is supported by a drive shaft 22 and driven by a drive pinion 23.

Between the cam ring 20 and the rotor 24 is preferably a

Working chamber 26 is formed. The working chamber 26 is preferably limited in the axial direction by the cover 12 and the end plate 14.

The cam ring 20 preferably has a first recess 20b and a second recess 20c on a section 20a adjacent to a suction zone 28 of the working chamber 26. A conveying chamber 30 arranged in the suction zone 28 of the working chamber 26 can preferably be supplied with a fluid flow F via the first recess 20b and the second recess 20c of the cam ring 20.

Alternatively to the provision of the first recess 20b and the second

Recess 20 c, for example, the cam ring 20 may be formed such that it has only one recess on a predetermined side of the cam ring, via which the fluid flow F of the delivery chamber 30 can be fed. The cover 12 preferably has a recess 32, which is designed to supply the fluid flow F of the delivery chamber 30 at least partially axially. The end plate 14 preferably has a recess 34, which is designed to supply the fluid flow F of the delivery chamber 30 at least partially axially. A lateral surface 24a of the rotor 24 is preferably concave. Fig. 2 shows a cross-sectional view of a portion of the positive displacement pump for delivering the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

The recess 32 of the lid 12 preferably has a supply region 36 arranged adjacently to the first recess 20b of the cam ring 20 and the second recess 20c of the cam ring 20. The feed region 36 is preferably along a length of the first

Recess 20b of the cam ring 20 and the second recess 20c of the cam ring 20 in the region of the recess 32 of the lid 12 is formed.

The recess 32 of the lid 12 preferably has a first, concentric curvature Kl, wherein the first recess 32 of the lid 12 in

Radial direction of the lid 12 is formed between the cam ring 20 and a radial end portion of the lid 12. The recess 32 of the lid 12 further includes a second curvature (not shown in FIG. 2) that is configured to redirect the fluid flow F from an axial direction of the lid 12 in a radial direction of the lid 12.

The recess 32 of the lid 12 also has a third curvature K3, which is formed in the feed region 36 and which in the

Delivery chamber 30 opens. The opening into the delivery chamber 30 third

Curvature K3 of the feed region 36 of the recess 32 of the cover 12 is preferably designed to supply the fluid flow F of the delivery chamber 30 at least partially axially. The third curvature K3 preferably flows into the delivery chamber 30 of the positive displacement pump 10 in a flowing manner. Alternatively, the third curvature K3, for example, at a definable angle in the delivery chamber 30 of the positive displacement pump 10 open.

The recess 34 (shown in FIG. 1) of the end plate 14 preferably has a feed region 38 arranged adjacent to the first recess 20b of the cam ring 20 and the second recess 20c of the cam ring 20 (shown in FIG. 1). The feed area 38 is

preferably along a length of the first recess 20b of the cam ring 20 and the second recess 20 c of the cam ring 20 in the region of

Recess 32 of the lid 12 is formed.

The recess 34 of the end plate 14 preferably has a (not shown in the figures) first, concentric curvature, wherein the recess 34 of the end plate 14 is formed in the radial direction of the end plate 14 between the cam ring 20 and a radial end portion of the end plate 14. The recess 34 of the end plate 14 further has a second curvature (not shown in the figures), which is designed to prevent the

Fluid flow F deflect from an axial direction of the end plate 14 in a radial direction of the end plate 14.

The recess 34 of the end plate 14 also has a third curvature K3 (shown in FIG. 1), which is formed in the feed region 38 and which opens into the delivery chamber 30. The third curvature K3 of the feed region 38 of the recess 34 of the end plate 14 which opens into the delivery chamber 30 is preferably designed to supply the fluid flow F of the delivery chamber 30 at least partially axially. The third curvature K3 preferably flows into the delivery chamber 30 of the positive displacement pump 10 in a flowing manner. Alternatively, the third curvature K3, for example, in a

define definable angle in the delivery chamber 30 of the positive displacement pump 10.

Fig. 3 shows a perspective view of the positive displacement pump for

Promotion of the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

The recess 32 of the lid 12 is formed in the radial direction of the lid 12 in the region of the first curvature K1 between the cam ring 20 and the radial end portion of the lid 12. The recess 32 of the lid 12 has, in a first portion 32a, an axial inclination α which extends from a surface 12a of the lid 12 to the feed area 36 of FIG. 2, adjacent to the first recess 20b of the cam ring and the second recess 20c of the cam ring the cover 12 formed recess 32 extends. The formed in the lid 12 axial inclination α preferably has an angle of inclination of 15 °. Alternatively, the inclination angle α can be up to 30 °. Furthermore, alternatively, the inclination angle α can be up to 45 °.

The recess 32 of the lid 12 has, in the first portion 32a, the first, concentric curvature K1, wherein the cam ring 20 and the lid 12 also preferably have a concentric curvature. Thus, the recess 32 of the lid 12 is formed in the region of the first, concentric curvature K L in the radial direction of the lid 12 between the cam ring 20 and the radial end portion of the lid 12.

The recess 32 of the cover 12 preferably has a second curvature K2 in a second section 32b of the recess 32. The second curvature K2 is preferably designed to divert the fluid flow F from the axial direction R1 of the cover 12 in the radial direction R2 of the cover 12. Thus, a streamlined delivery of the fluid into the delivery chamber 30 can be achieved.

The recess 34 of the end plate 14 is formed in the radial direction of the end plate in the region of the (not shown in FIG. 3) first curvature of the recess 34 between the cam ring 20 and the radial end portion of the end plate 14. The recess 34 of the end plate 14 has, in a first (not shown in Fig. 3) portion on an axial inclination, which is adjacent to a surface of the end plate 14, to the first recess 20b of the cam ring and the second recess 20c of the cam ring arranged feed region 38 of the formed in the face plate 14 recess 34 extends.

The formed in the end plate 14 axial slope preferably has an angle of inclination of 15 °. Alternatively, the inclination angle can be up to 30 °. Furthermore, alternatively, the inclination angle can be up to 45 °.

The recess 34 of the end plate 14 has in the first portion, the first, concentric curvature, wherein the cam ring 20 and the end plate 14 preferably also have a concentric curvature. Thus, the recess 34 of the end plate 14 is formed in the region of the first, concentric curvature in the radial direction of the end plate 14 between the cam ring 20 and the radial end portion of the end plate 14.

The recess 34 of the end plate 14 preferably has a second curvature in a second section of the recess 34 (not shown in FIG. 3). The second curvature is preferably designed to divert the fluid flow F from the axial direction Rl of the end plate 14 in the radial direction R2 of the end plate 14. Thus, a streamlined delivery of the fluid into the delivery chamber 30 can be achieved.

Fig. 4 shows a perspective view of the positive displacement pump for

The first recess 20b of the cam ring 20 and the second recess 20c of the cam ring 20 are preferably arranged adjacent to the feed region 36 of the recess 32 of the lid 12. The supply region 36 has the third curvature K3, which opens into the delivery chamber 30. The fluid flow F can thus be supplied to the delivery chamber 30 in a streamlined manner, since the third curve K3 flows into the delivery chamber 30 in a flowing manner. The fluid flow F is thus the delivery chamber 30 at an angle of 0 to 90 ° with respect to the lateral surface of the rotor, i. a bottom surface of the delivery chamber, can be fed.

FIG. 5 shows a flowchart of a method for operating the

Positive displacement pump for conveying the fluid to the consumer

Motor vehicle according to the preferred embodiment of the invention.

The method comprises providing Sl of a cam ring inserted into a pump housing and a drive shaft mounted with a rotor, wherein a working chamber is formed between the cam ring and the rotor. The method further comprises providing S2 of the cam ring at a portion adjacent to a suction zone of the working chamber first recess and a second recess, wherein in the suction zone arranged delivery chamber, a fluid flow via the first recess and the second recess of the cam ring can be fed. The method further comprises suction S3 of the fluid into the delivery chamber, wherein the

Fluid flow of the delivery chamber is at least partially axially fed via a recess formed in the cover and the end plate.

As an alternative to the formation of a recess in the cover and the end plate, for example, only the lid or only the end plate may have a recess. Furthermore, as an alternative to the design of the cam ring with a first recess and a second recess, the cam ring may, for example, have only one recess.

The method further comprises deflecting the fluid flow in an axial direction of the lid and the end plate in a radial direction of the lid and the end plate by means of a first, concentric curvature formed in sections in the recess of the cover and the recess of the end plate and a second curvature formed in sections becomes. The method further comprises that a third curvature formed along the first recess and the second recess of the cam ring opens a feed region of the recess of the cover and the recess of the end plate into the delivery chamber. The fluid flow is preferably at least partially axially fed to the delivery chamber at an angle of 0 to 90 °.

Fig. 6 shows a steering system for a motor vehicle with the positive displacement pump for delivering the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

The steering system 1 is located in a motor-driven vehicle, in particular in a passenger car or a commercial vehicle. The steering system 1 comprises a steering wheel 2 to be actuated by the driver, which acts via a steering column 3 on a vehicle wheel via a steering gear 4 and adjusts this in accordance with the driver's request. In the steering column 3, a steering angle torque sensor 5 is symbolically entered via the appropriate the steering angle, possibly also the steering angle speed to be determined and are supplied as input to a control and control unit, in which the input signals are processed and the from this - together with other vehicle status and operating variables - generates control signals via which the various units of the vehicle including the steering system 1 and the drive motor are to be set.

The steering system 1 has at least one consumer or actuating cylinder 6. The adjusting cylinder 6 has two separate chambers 6a and 6b, which are each connected via hydraulic lines 8a, 8b to a pressure regulating valve 8. The displacement pump 10 is preferably designed as a vane pump. The displacement pump 10 preferably generates a hydraulic pressure, so that the pressure control valve 8 via the positive displacement pump 10 hydraulic fluid is supplied under pressure. In addition, a drive motor 9a is provided, which is connected to the positive displacement pump 10 by means of a coupling 9b. Furthermore, a hydraulic reservoir 11 is provided, via the recirculated

Hydraulic medium of the positive displacement pump 10 can be fed.

Fig. 7 shows a transmission for a motor vehicle with the positive displacement pump for delivering the fluid to the consumer according to the preferred

Embodiment of the invention.

The transmission 100 is located in a motor-driven vehicle, in particular in a passenger car or a commercial vehicle. The displacement pump 10 is preferably designed as a vane pump. The positive displacement pump 10 generates a hydraulic pressure for the consumer 106.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto but is modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention. For example, the recess of the cam ring and / or the recess of the lid and the end plate may have another suitable shape or design, which allows effective filling of the delivery chamber of the suction side of the positive displacement pump depending on the structural design of the positive displacement pump.

LIST OF REFERENCE NUMBERS

1 steering system

2 steering wheel

3 steering column

4 steering gear

5 Steering angle torque sensor 6, 106 actuating cylinder

6a, 6b chamber

8 pressure control valve

8a, 8b hydraulic line

9a drive motor

9b clutch

10 positive displacement pump

12 lids

12a surface of the lid

14 face plate

18 pump housings

20 cam ring

20a section

20b, 20c recess

22 drive shaft

23 drive pinion

24 rotor

24a lateral surface of the rotor

26 working chamber

28 suction zone

30 delivery chamber

32, 34 recess

36, 38 feed area

F fluid flow

α tilt

Kl first curvature

K2 second curvature

K3 third curvature Axial direction Radiairichtun;

Claims

EM150315

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Displacement pump (10), in particular vane pump for conveying a fluid for a consumer (6) of a motor vehicle, having a cover (12) and an end plate (14) having pump housing (18), in which a cam ring (20) inserted and a drive shaft (22) is mounted with a rotor (24), wherein between the cam ring (20) and the rotor (24) a working chamber (26) is formed, which limits in the axial direction by the cover (12) and the end plate (14) is, where the

Curved ring (20) at a to a suction zone (28) of the working chamber (26) adjacent section (20a) has at least one recess (20b, 20c), wherein in the suction zone (28) arranged delivery chamber (30) a fluid flow (F) via the at least one recess (20b, 20c) of the cam ring (20) can be supplied, characterized in that the

Cover (12) and / or the end plate (14) has a recess (32, 34) which is adapted to supply the fluid flow (F) of the delivery chamber (30) at least partially axially.

Positive displacement pump according to claim 1, characterized in that the

Recess (32) of the lid (12) and / or the recess (34) of the

Face plate (14) in the radial direction of the lid (12) and / or the end plate (14) at least partially between the cam ring (20) and a radial end portion of the lid (12) and / or the end plate (14) is formed.

Displacement pump according to claim 1 or 2, characterized in that the recess (32) of the lid (12) and / or the recess (34) of the end plate (14) at least partially an axial inclination (a) which extends from a surface ( 12a) of the lid (12) and / or the

End plate (14) to a, to the at least one recess (20b, 20c) of the cam ring (20) adjacently arranged feed region (36) of the EM150315

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End plate (14) formed recess (34) extends.

Positive displacement pump according to claim 3, characterized in that the at least partially formed in the lid (12) and / or the end plate (14) axial slope (a) has an inclination angle of up to 45 °, preferably of up to 30 °.

Positive displacement pump according to one of the preceding claims, characterized in that the recess (32) of the lid (12) and / or the recess (34) of the end plate (14) at least partially a first, concentric curvature (K1) and at least partially a second curvature (K2), which is adapted to the fluid flow (F) from an axial direction (Rl) of the lid (12) and / or the end plate (14) in a radial direction (R2) of the lid (12) and / or the end plate (14) to redirect.

Positive displacement pump according to one of claims 3 to 5, characterized

in that the recess (32) of the cover (12) and / or the recess (34) of the end plate (14) in which at least one

Recess (20b, 20c) of the cam ring (20) arranged adjacent

Feed region (36) along the recess (20b, 20c) of the cam ring (20) has a third curvature (K3), which opens into the delivery chamber (30).

Positive displacement pump according to claim 6, characterized in that in the delivery chamber (30) opening third curvature (K3) of the

Feed region (36) of the recess (32) of the cover (12) and / or the recess (34) of the end plate (14) is adapted to supply the fluid flow (F) of the delivery chamber (30) at least partially axially, wherein the fluid flow ( F) of the delivery chamber (30) can be fed at an angle of 0 to 90 °. EM150315

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Method for operating a positive-displacement pump (10), in particular a vane pump for delivering a fluid to a consumer (6) of a motor vehicle, comprising the steps of:

Providing (S1) an inserted into a pump housing (18)

Cam ring (20) and with a rotor (24) mounted drive shaft (22), wherein between the cam ring (20) and the rotor (24) has a

Working chamber (26) is formed;

Providing (S2) the cam ring (20) at a portion (20a) adjacent to a suction zone (28) of the working chamber (26) with at least one

Recess (20b, 20c), wherein in the suction zone (28) arranged delivery chamber (30) has a fluid flow (F) over the at least one

Recess (20b, 20c) of the cam ring (20) can be fed; and

Sucking (S3) the fluid into the delivery chamber (30), thereby

characterized in that the fluid flow (F) of the delivery chamber (30) via at least one, in the lid (12) and / or the end plate (14)

formed recess (32, 34) is at least partially axially supplied.

A method according to claim 8, characterized in that the

Fluid flow (F) by means of a, in the recess (32) of the lid (12) and / or the recess (34) of the end plate (14) at least partially formed first concentric curvature (K1) and at least partially formed second curvature (K2 ) of one

Axial direction (Rl) of the lid (12) and / or the end plate (14) in a radial direction (R2) of the lid (12) and / or the end plate (14)

is diverted.

0. The method of claim 8 or 9, characterized in that a

along the at least one recess (20b, 20c) of the cam ring (20) formed, third curvature (K3) of a feed region (36) of

Recess (32) of the lid (12) and / or the recess (34) of the

Face plate (14) opens into the delivery chamber (30), wherein the fluid flow (F) of the delivery chamber (30) is at least partially axially fed at an angle of 0 to 90 °. EM150315

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1 1. Steering system (1) for a motor vehicle, comprising:

at least one consumer (6); and

a positive displacement pump (10) according to one of claims 1 to 7 for

Promotion of a fluid for the at least one consumer (6) of the

Steering system (1).

12. Steering system according to claim 1 1, characterized in that the

Positive displacement pump (10) is formed by a vane pump.

13. Transmission (100) for a motor vehicle, comprising:

at least one consumer (106); and

a positive displacement pump (10) according to one of claims 1 to 7 for

Conveying a fluid for the at least one consumer (106) of the transmission (100).

14. A transmission according to claim 13, characterized in that the

Positive displacement pump (10) is formed by a vane pump.