DE202015010041U1 - displacement pump, steering system and transmission - Google Patents

Abstract

Positive displacement pump (10), in particular a vane pump for conveying a fluid for a consumer (6) of a motor vehicle, with a pump housing (18) having a cover (12) and a front plate (14), into which a cam ring (20) is inserted and a drive shaft (22) with a rotor (24) is mounted, wherein a working chamber (26) is formed between the cam ring (20) and the rotor (24), which is delimited in the axial direction by the cover (12) and the front plate (14), wherein the cam ring (20) has at least one recess (20b, 20c) on a section (20a) adjacent to a suction zone (28) of the working chamber (26), wherein a fluid flow (F) can be fed to a conveying chamber (30) arranged in the suction zone (28) via the at least one recess (20b, 20c) of the cam ring (20), characterized in that the cover (12) has a recess (32) which is designed to at least partially axially feed the fluid flow (F) to the delivery chamber (30), wherein the recess (32) of the cover (12) is formed in the radial direction of the cover (12) at least in sections between the cam ring (20) and a radial end section of the cover (12), wherein the recess (32) of the cover (12) has at least in sections an axial inclination (α) which extends from a surface (12a) of the cover (12) to a feed region (36) of the recess (32) formed in the cover (12) arranged adjacent to the at least one recess (20c) of the cam ring (20), wherein the axial inclination (α) formed at least in sections in the cover (12) has an inclination angle of up to 45°, and wherein the recess (32) of the cover (12) at least in sections has a first, concentric curvature (K1) and at least in sections a second curvature (K2), which is designed to deflect the fluid flow (F) from an axial direction (R1) of the cover (12) into a radial direction (R2) of the cover (12).

Description

displacement pump, steering system and transmission

The invention relates to a positive displacement pump, in particular a vane pump for conveying a fluid for a consumer of a motor vehicle. The invention also relates to a steering system for a motor vehicle. The invention also relates to a transmission for a motor vehicle.

Vane pumps of known design are generally constructed in such a way that a rotor rotates in a cam ring. The cam ring is closed on each side by a front plate forming a housing and by a control plate. The cam ring has a contour that runs coaxially or non-coaxially to the axis of the rotor, depending on the design, and forms a pump chamber. In the circumferential surface of the rotor, essentially radially running slots are arranged across its width, in which radially movable vanes are guided. When the rotor rotates about its axis, the vanes are guided along the contour of the cam ring, with chambers with changing volumes being formed between two adjacent vanes. A suction area and a pump pressure chamber or pressure area are formed in accordance with the rotary movement of the rotor, with the suction area being arranged in the area of increasing volume and the pressure area of the pump pressure chamber being arranged in the area of decreasing volume of the chambers.

The WO 96/13665 discloses a vane pump in which a suction channel is divided into two symmetrically arranged, curved suction arms which lead to suction zones and are located in an end wall of the housing.

In pumps with a cam ring recessed in the suction area, where suction takes place mainly via cam ring openings, this arrangement causes filling problems, since the radially sucked fluid hits a surface of the rotor and is reflected back in the impulse. This leads to a supply blockage of the vane cell to be filled. Accordingly, the suction volume of the vane cell cannot be used effectively.

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

The object is achieved 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 patent claim 1. Furthermore, the object is achieved with a steering system with the features of patent claim 5. Furthermore, the object is achieved with a transmission with the features of patent claim 7.

The present invention provides a positive displacement pump, in particular a vane pump for conveying a fluid for a consumer of a motor vehicle, wherein the cover has a recess which is designed to at least partially axially supply the fluid flow to the conveying chamber.

The present invention further enables a method for operating a positive displacement pump, in particular a vane pump for conveying a fluid for a consumer of a motor vehicle, wherein the fluid flow is at least partially supplied axially to the conveying chamber via a recess formed in the cover.

The present invention further provides a steering system with at least one consumer and a positive displacement pump for conveying 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 conveying a fluid for the at least one consumer of the transmission.

One idea of the present invention is to supply the fluid flow to the delivery chamber at least partially axially by providing the recess formed in the cover. As a result, suction takes place not only radially via the cam ring openings, but also axially via the recess formed in the cover. This advantageously makes it possible to efficiently fill a respective delivery chamber of the working chamber of the positive displacement pump.

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

According to the invention, the recess of the cover is formed in the radial direction of the cover at least in sections between the cam ring and a radial end section of the cover. The fluid flow can thus be fed to the recess formed in the cover in a streamlined manner.

According to the invention, the recess of the cover has an axial inclination at least in sections, which extends from a surface of the cover to a supply region of the recess formed in the cover, which is arranged adjacent to the at least one recess of the cam ring. In this way, an at least partially axial supply of the fluid flow from the supply region of the recess formed in the cover can be achieved in an advantageous manner.

According to the invention, the axial inclination formed at least in sections in the cover has an inclination angle of up to 45°, preferably up to 30°. The fluid flow can thus be fed to the feed area in a streamlined manner.

According to the invention, the recess of the cover has at least in sections a first, concentric curvature and at least in sections a second curvature, which is designed to divert the fluid flow from an axial direction of the cover into a radial direction of the cover. By providing the second curvature, which is designed to divert the fluid flow from the axial direction of the cover into the radial direction of the cover, the fluid flow can be fed to the suction zone of the working chamber in an efficient manner with the aid of the second curvature.

According to a further preferred development, it is provided that the recess of the cover in the supply area arranged adjacent to the at least one recess of the cam ring has a third curvature along the recess of the cam ring, which opens into the delivery chamber. By providing the third curvature, the fluid flow can advantageously be fed to the delivery chamber at least partially axially.

According to a further preferred development, it is provided that the third curvature of the supply region of the recess of the cover, which opens into the delivery chamber, is designed to supply the fluid flow to the delivery chamber at least partially axially, wherein the fluid flow can be supplied to the delivery chamber at an angle of 0 to 90°. Depending on the design of the third curvature, an angle can thus be advantageously determined at which the fluid flow is supplied to the delivery chamber.

The described designs and further training courses can be combined as desired.

Further possible embodiments, further developments and implementations of the invention also include combinations of features of the invention described above or below with respect to the embodiments that are not explicitly mentioned.

The accompanying drawings are intended to provide a further understanding of embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain principles and concepts of the invention.

Other embodiments and many of the above advantages will become apparent upon consideration of the drawings. The illustrated elements of the drawings are not necessarily shown to scale with respect to one another.

• 1 eine Längsschnittansicht einer Verdrängerpumpe zur Förderung eines Fluides für einen Verbraucher eines Kraftfahrzeuges gemäß einer bevorzugten Ausführungsform der Erfindung;
• 2 eine Querschnittsansicht eines Teilbereiches der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeuges gemäß der bevorzugten Ausführungsform der Erfindung;
• 3 eine perspektivische Darstellung der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeuges gemäß der bevorzugten Ausführungsform der Erfindung;
• 4 eine perspektivische Darstellung der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeuges gemäß der bevorzugten Ausführungsform der Erfindung;
• 5 ein Ablaufdiagramm eines Verfahrens zum Betreiben der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeuges gemäß der bevorzugten Ausführungsform der Erfindung;
• 6 ein Lenksystem für ein Kraftfahrzeug mit der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeuges gemäß der bevorzugten Ausführungsform der Erfindung; und
• 7 ein Getriebe für ein Kraftfahrzeug mit der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher gemäß der bevorzugten Ausführungsform der Erfindung.

They show:

• 1 a longitudinal sectional view of a positive displacement pump for conveying a fluid for a consumer of a motor vehicle according to a preferred embodiment of the invention;
• 2 a cross-sectional view of a portion of the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention;
• 3 a perspective view of the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention;
• 4 a perspective view of the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention;
• 5 a flow chart of a method for operating the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention;
• 6 a steering system for a motor vehicle with the displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention; and
• 7 a transmission for a motor vehicle with the positive displacement pump for conveying the fluid for the consumer according to the preferred embodiment of the invention.

In the figures of the drawings, identical reference symbols designate identical or functionally identical elements, parts or components, unless otherwise stated.

1 shows a longitudinal sectional view of a positive displacement pump for conveying 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 a front plate 14.

A cam ring 20 is inserted into the pump housing 18. A rotor 24 is also arranged within the cam ring 20, which is supported by a drive shaft 22 and driven by a drive pinion 23. A working chamber 26 is preferably formed between the cam ring 20 and the rotor 24. The working chamber 26 is preferably delimited 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 fluid flow F can preferably be fed to a delivery chamber 30 arranged in the suction zone 28 of the working chamber 26 via the first recess 20b and the second recess 20c of the cam ring 20.

As an alternative to providing the first recess 20b and the second recess 20c, the cam ring 20 can, for example, be designed such that it has only one recess on a predetermined side of the cam ring, via which the fluid flow F can be fed to the delivery chamber 30. The cover 12 preferably has a recess 32 which is designed to at least partially axially feed the fluid flow F to the delivery chamber 30. The end plate 14 preferably has a recess 34 which is designed to at least partially axially feed the fluid flow F to the delivery chamber 30. A lateral surface 24a of the rotor 24 is preferably concave.

2 shows a cross-sectional view of a portion of the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

The recess 32 of the cover 12 preferably has a feed region 36 arranged adjacent 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 formed 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 cover 12.

The recess 32 of the cover 12 preferably has a first, concentric curvature K1, wherein the first recess 32 of the cover 12 is formed in the radial direction of the cover 12 between the cam ring 20 and a radial end section of the cover 12. The recess 32 of the cover 12 further has a (in 2 not shown) second curvature which is designed to redirect the fluid flow F from an axial direction of the cover 12 into a radial direction of the cover 12.

The recess 32 of the cover 12 also has a third curvature K3, which is formed in the feed region 36 and which opens into the delivery chamber 30. The third curvature K3 of the feed region 36 of the recess 32 of the cover 12, which opens into the delivery chamber 30, is preferably designed to at least partially axially feed the fluid flow F to the delivery chamber 30. The third curvature K3 preferably merges smoothly into the delivery chamber 30 of the positive displacement pump 10. Alternatively, the third curvature K3 can open into the delivery chamber 30 of the positive displacement pump 10, for example at a definable angle.

The (in 1 shown) recess 34 of the front plate 14 preferably has a recess arranged adjacent to the first recess 20b of the cam ring 20 and the second recess 20c of the cam ring 20 (in 1 shown) feed region 38. The feed region 38 is preferably formed 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 cover 12.

The recess 34 of the end plate 14 preferably has a first, concentric curvature (not shown in the figures), 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 section 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 redirect the fluid flow F from an axial direction of the end plate 14 into a radial direction of the end plate 14.

The recess 34 of the front plate 14 also has a (in 1 shown) third curvature K3, 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 front plate 14, which opens into the delivery chamber 30, is preferably designed to at least partially axially feed the fluid flow F to the delivery chamber 30. The third curvature K3 preferably merges smoothly into the delivery chamber 30 of the positive displacement pump 10. Alternatively, the third curvature K3 can open into the delivery chamber 30 of the positive displacement pump 10, for example at a definable angle.

3 shows a perspective view of the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

The recess 32 of the cover 12 is formed in the radial direction of the cover 12 in the region of the first curvature K1 between the cam ring 20 and the radial end section of the cover 12. The recess 32 of the cover 12 has an axial inclination α in a first section 32a, which extends from a surface 12a of the cover 12 to the feed region 36 of the recess 32 formed in the cover 12, which is arranged adjacent to the first recess 20b of the cam ring and the second recess 20c of the cam ring.

The axial inclination α formed in the cover 12 preferably has an inclination angle 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 cover 12 has the first, concentric curvature K1 in the first section 32a, wherein the cam ring 20 and the cover 12 preferably also have a concentric curvature. The recess 32 of the cover 12 is thus formed in the region of the first, concentric curvature K1 in the radial direction of the cover 12 between the cam ring 20 and the radial end section of the cover 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 redirect the fluid flow F from the axial direction R1 of the cover 12 into the radial direction R2 of the cover 12. In this way, a flow-optimized supply of the fluid into the delivery chamber 30 can be achieved.

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

The axial inclination formed in the end plate 14 preferably has an inclination angle 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 the first, concentric curvature in the first section, wherein the cam ring 20 and the end plate 14 preferably also have a concentric curvature. The recess 34 of the end plate 14 is thus 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 section of the end plate 14.

The recess 34 of the front plate 14 preferably has a (in 3 The second section of the recess 34 has a second curvature (not shown). The second curvature is preferably designed to redirect the fluid flow F from the axial direction R1 of the end plate 14 into the radial direction R2 of the end plate 14. In this way, a flow-optimized supply of the fluid into the delivery chamber 30 can be achieved.

4 shows a perspective view of the positive displacement pump for conveying the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention.

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 area 36 of the recess 32 of the cover 12. The feed area 36 has the third curvature K3, which opens into the delivery chamber 30. The fluid flow F can thus be fed to the delivery chamber 30 in a streamlined manner, since the third curvature K3 flows smoothly into the delivery chamber 30. The fluid flow F can thus be fed to the delivery chamber 30 at an angle of 0 to 90° with respect to the outer surface of the rotor, i.e. a bottom surface of the delivery chamber.

5 shows a flow chart of a method for operating the positive displacement pump to deliver the fluid to the consumer of the Motor vehicle according to the preferred embodiment of the invention.

The method comprises providing S1 a cam ring inserted into a pump housing and a drive shaft supported by a rotor, wherein a working chamber is formed between the cam ring and the rotor. The method further comprises providing S2 the cam ring on a section adjacent to a suction zone of the working chamber with a first recess and a second recess, wherein a fluid flow can be supplied to a delivery chamber arranged in the suction zone via the first recess and the second recess of the cam ring. The method further comprises sucking S3 the fluid into the delivery chamber, wherein the fluid flow is at least partially supplied axially to the delivery chamber 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 front plate, for example, only the cover or only the front plate can have a recess. Furthermore, as an alternative to the formation of the cam ring with a first recess and a second recess, the cam ring can, for example, have only one recess.

The method further comprises that the fluid flow is deflected from an axial direction of the cover and the end plate into a radial direction of the cover 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.

The method further comprises that a third curvature of a supply region of the recess of the cover and the recess of the front plate, formed along the first recess and the second recess of the cam ring, opens into the conveying chamber. The fluid flow is preferably fed to the conveying chamber at least partially axially at an angle of 0 to 90°.

6 shows a steering system for a motor vehicle with the positive displacement pump for conveying 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 that is operated by the driver and that acts on a vehicle wheel via a steering gear 4 via a steering column 3 and adjusts the wheel according to the driver's wishes.

A steering angle torque sensor 5 is symbolically incorporated into the steering column 3, via which the steering angle and, if applicable, also the steering angle speed are to be determined and fed as an input signal to a control unit in which the input signals are processed and which - together with other vehicle state 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 adjusted.

The steering system 1 has at least one consumer or actuating cylinder 6. The actuating cylinder 6 has two separate chambers 6a and 6b, each of which is connected to a pressure control valve 8 via hydraulic lines 8a, 8b. The positive displacement pump 10 is preferably designed as a vane pump. The positive displacement pump 10 preferably generates a hydraulic pressure, so that hydraulic fluid under pressure is supplied to the pressure control valve 8 via the positive displacement pump 10. 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 which returned hydraulic medium can be supplied to the positive displacement pump 10.

7 shows a transmission for a motor vehicle with the positive displacement pump for conveying the fluid for 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 positive 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 using preferred embodiments, it is not limited thereto, but can be modified in many ways. In particular, the invention can be changed or modified in many ways without deviating from the essence of the invention.

For example, the recess of the cam ring and/or the recess of the cover and the front plate can have another suitable shape or design which, depending on the structural design of the positive displacement pump, enables effective filling of the delivery chamber on the suction side of the positive displacement pump.

list of reference symbols

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

coupling

10

positive displacement pump

12

Lid

12a

surface of the lid

14

front plate

18

pump housing

20

curve ring

20a

Section

20b, 20c

recess

22

drive shaft

23

drive pinion

24

rotor

24a

surface of the rotor

26

labor chamber

28

suction zone

30

production chamber

32, 34

recess

36, 38

feed area

F

fluid flow

α

inclination

K1

first bend

K2

second curvature

K3

third curvature

R1

axial direction

R2

radial direction

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 accepts no liability for any errors or omissions.

Cited patent literature

• WO 9613665 [0003]

Claims (8)

Positive displacement pump (10), in particular a vane pump for conveying a fluid for a consumer (6) of a motor vehicle, with a pump housing (18) having a cover (12) and a front plate (14), into which a cam ring (20) is inserted and a drive shaft (22) with a rotor (24) is mounted, wherein a working chamber (26) is formed between the cam ring (20) and the rotor (24), which is delimited in the axial direction by the cover (12) and the front plate (14), wherein the cam ring (20) has at least one recess (20b, 20c) on a section (20a) adjacent to a suction zone (28) of the working chamber (26), wherein a fluid flow (F) can be fed to a conveying chamber (30) arranged in the suction zone (28) via the at least one recess (20b, 20c) of the cam ring (20), characterized in that the cover (12) has a recess (32) which is designed to at least partially axially feed the fluid flow (F) to the delivery chamber (30), wherein the recess (32) of the cover (12) is formed in the radial direction of the cover (12) at least in sections between the cam ring (20) and a radial end section of the cover (12), wherein the recess (32) of the cover (12) has at least in sections an axial inclination (α) which extends from a surface (12a) of the cover (12) to a feed region (36) of the recess (32) formed in the cover (12) arranged adjacent to the at least one recess (20c) of the cam ring (20), wherein the axial inclination (α) formed at least in sections in the cover (12) has an inclination angle of up to 45°, and wherein the recess (32) of the cover (12) at least in sections has a first, concentric curvature (K1) and at least in sections a second curvature (K2), which is designed to deflect the fluid flow (F) from an axial direction (R1) of the cover (12) into a radial direction (R2) of the cover (12). positive displacement pump after claim 1 , characterized in that the axial inclination (α) formed at least in sections in the cover (12) has an inclination angle of up to 30°. positive displacement pump after claim 1 or 2 , characterized in that the recess (32) of the cover (12) in the feed region (36) arranged adjacent to the at least one recess (20c) of the cam ring (20) has a third curvature (K3) along the recess (20c) of the cam ring (20), which third curvature opens into the conveying chamber (30). positive displacement pump after claim 3 , characterized in that the third curvature (K3) of the feed region (36) of the recess (32) of the cover (12) opening into the feed chamber (30) is designed to feed the fluid flow (F) to the feed chamber (30) at least partially axially, wherein the fluid flow (F) can be fed to the feed chamber (30) at an angle of 0° to 90°. Steering system (1) for a motor vehicle, comprising: at least one consumer (6); and a displacement pump (10) according to one of the Claims 1 until 4 for supplying a fluid to at least one consumer (6) of the steering system (1). steering system according to claim 5 , characterized in that the positive displacement pump (10) is designed as a vane pump. Transmission (100) for a motor vehicle, comprising: at least one consumer (106); and a displacement pump (10) according to one of the Claims 1 until 4 for conveying a fluid for the at least one consumer (106) of the transmission (100). transmission after claim 7 , characterized in that the positive displacement pump (10) is designed as a vane pump.

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