WO2017021115A1

WO2017021115A1 - Displacement pump and hydraulic system

Info

Publication number: WO2017021115A1
Application number: PCT/EP2016/066630
Authority: WO
Inventors: Ramazan GÖKÖZ; Stephan Grießer
Original assignee: Robert Bosch Automotive Steering Gmbh
Priority date: 2015-08-03
Filing date: 2016-07-13
Publication date: 2017-02-09
Also published as: DE102015112671A1

Abstract

The invention relates to a displacement pump (10), in particular a rotary vane pump for a motor vehicle, wherein pressure medium flows can be conducted out of the discharge chambers (12b, 14b) into a respective pressure chamber (18a, 18b), wherein a first pressure (P1) can be generated in the discharge chamber (12b) of the first working chamber (12) and a second pressure (P2) can be generated in the discharge chamber (14b), wherein the first pressure (P1) can be provided to a first consumer (19) and the second pressure (P2) can be provided to a second consumer (20). Furthermore, the invention relates to a hydraulic system (1) for a motor vehicle.

Description

Description title

Positive displacement pump and hydraulic system

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

Vane pump for a motor vehicle. The invention further relates to a hydraulic system for a motor vehicle.

State of the art

Positive displacement pumps for providing a pressure medium flow of a

Consumer in a motor vehicle are known. They are for example formed as vane pumps and have a housing in which a rotor rotates in a cam ring on. On the housing are a suction port for pressure medium for supplying pressure medium from a pressure medium container in one

Pump pressure chamber and a pressure port for dispensing pressure medium to a consumer arranged.

Classic pump applications require a certain amount of

Pressure medium and a certain pressure of the pressure medium. For this purpose, two pressure chambers of a rotor set are combined to form a stream. However, some applications require different amounts of the pressure medium and different pressures of the pressure medium.

DE 10 2011 079 822 AI discloses a hydrostatic pump for delivering a fluid, comprising a rotor drivable via a shaft and a stationary cam ring, which forms with the rotor displacement chambers, wherein the displacement chambers are divided in the axial direction into first and second pressure chambers, wherein the rotor is divided in the axial direction into a first rotor and a second rotor, wherein between the first and second pressure chambers a breakthrough partition is arranged and that the first and second pressure chambers communicate with each other via the openings.

Positive displacement pumps may also have more than one suction port and one pressure port. It is therefore desirable to have one

Provide positive displacement pump, which different amounts of a

Can provide pressure medium and different pressures of the pressure medium to different consumers. The invention is therefore based on the object to provide a positive displacement pump, which can provide different flow rates of a pressure medium and different pressures of the pressure medium to different consumers. The object is with a positive displacement pump, in particular a

Vane pump for a motor vehicle, with the characteristics of

Patent claim 1 solved. Furthermore, the task with a

Hydraulic system for a motor vehicle with the characteristics of

Patent claim 13 solved.

Disclosure of the invention

The present invention provides a positive displacement pump, in particular a vane pump for a motor vehicle, wherein the pressure medium flows from the outlet chambers in each case a pressure chamber are feasible, wherein in the

Auslasskammer the first working chamber, a first pressure and in the

Outlet chamber of the second working chamber, a second pressure can be generated, and wherein the first pressure to a first consumer and the second pressure to a second consumer can be provided.

The present invention further provides a hydraulic system for a motor vehicle with a positive displacement pump, a first consumer to which by the positive displacement pump, a pressure medium can be provided with a first pressure, and a second consumer, through which

Positive displacement pump, a pressure medium with a second pressure can be provided. An idea of the present invention is to provide a positive displacement pump,

in particular to provide a vane pump for a motor vehicle, which can advantageously provide different amounts of a pressure medium and different pressures of a pressure medium to different consumers.

Thus, two consumers can be supplied with pressure medium of different pressures with only one positive displacement pump. Furthermore, can be achieved in comparison to conventional pumps, for example in tandem execution by the present positive displacement pump over conventional solutions a space savings and a cost-effective solution.

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

According to a preferred embodiment, it is provided that the

Outlet chamber of the first working chamber through the formed in a housing of the positive displacement pump first pressure chamber with a first

Pressure port for discharging pressure medium from the positive displacement pump is connected, and the outlet chamber of the second working chamber by a formed in the housing of the positive displacement pump second pressure chamber with a second pressure port for discharging pressure medium from the

Positive displacement pump is connected, wherein the first pressure chamber and the second pressure chamber are fluidly separated from each other. Due to the fluidic separation of the first pressure chamber and the second pressure chamber of the positive displacement pump, it is possible to provide a first pressure medium flow to the first consumer and a second pressure medium flow to the second consumer, wherein the first pressure medium flow may have a different pressure than the second pressure medium flow as required ,

According to a further preferred embodiment, it is provided that the first pressure chamber in the housing of the positive displacement pump in the axial direction of the

Housing is arranged substantially congruent to the first working chamber and the second pressure chamber in the housing of the positive displacement pump in the axial direction of the housing substantially congruent to the second Working chamber is arranged. Thus, there is advantageously no fluidic connection in the housing of the positive displacement pump between the first pressure chamber and the second pressure chamber.

According to a further preferred development, it is provided that the first pressure chamber and the second pressure chamber are fluidically separated from one another in the axial direction of the housing by a front plate, a cover, a rear wing channel formed in the rotor, an axial sealing ring inserted into the end plate and a support ring supporting the axial sealing ring , Thus, it can be ensured in an advantageous manner that both in the housing and the face plate, the cover and the rotor no fluidic connection of the first pressure chamber and the second pressure chamber is provided. The first pressure chamber and the second pressure chamber are thus fluidly separated from each other.

According to a further preferred embodiment, it is provided that a cam ring of the positive displacement pump has an asymmetrical cross section, the first working chamber and the second working chamber of the positive displacement pump formed between a rotor inserted into the positive displacement pump and the cam ring having a different volume. Thus, the first working chamber of the positive displacement pump has a first delivery volume and the second working chamber of the positive displacement pump a second delivery volume, which have a predetermined ratio to each other.

According to a further preferred refinement, it is provided that a first delivery volume of the pressure medium can be provided to the first consumer and a second delivery volume of the pressure medium, which differs from the first delivery volume of the pressure medium, to the second consumer. The positive displacement pump thus advantageously has a wide

Application spectrum on. For example, the positive displacement pump may provide a first volume flow to a vehicle transmission and a second volume flow to an auxiliary device, such as a hydraulically operated fan.

According to a further preferred embodiment, it is provided that a cam ring of the positive displacement pump has a symmetrical cross section, wherein the between a rotor inserted into the positive displacement pump and the Curved ring trained first working chamber and second working chamber of the positive displacement pump have an equal volume. By providing the first working chamber and the second working chamber of the positive displacement pump with an equal volume of pressure medium flows to the first consumer and the second consumer can be provided in an advantageous manner, wherein the

Delivery volume of each working chamber is the same, but is advantageously provided with a different pressure.

According to a further preferred embodiment, it is provided that a first delivery volume of the pressure medium and to the second consumer a second delivery volume of the pressure medium can be provided to the first consumer, wherein the first delivery volume and the second delivery volume have an equal amount. Thus, with the positive displacement pump advantageously a first and second pressure medium flow can be provided to respective consumers who require an equal delivery volume.

According to a further preferred development, it is provided that the first pressure generated in the outlet chamber of the first working chamber and the second pressure generated in the outlet chamber of the second working chamber have a different amount. Due to the fluidic separation of the first pressure chamber and the second pressure chamber, it is thus possible in an advantageous manner to provide a first pressure to the first consumer and to the second consumer a second pressure which differ in their amount.

According to a further preferred development it is provided that the positive displacement pump has a first suction port, which is connected to the inlet chamber of the first working chamber, and has a second suction port, which communicates with the inlet chamber of the second

Working chamber is connected. By providing a first suction port and a second suction port, the first inlet chamber and the second inlet chamber can be supplied with separate pressure medium flows. Thus, an improved supply of the respective inlet chambers is ensured in an advantageous manner. According to a further preferred embodiment, it is provided that the positive displacement pump is designed left-handed and / or right-handed. The fluidic separation of the first pressure chamber and the second pressure chamber of the positive displacement pump is thus both left-handed and / or

clockwise rotating positive displacement pumps used.

According to a further preferred development, it is provided that the first pressure of the first pressure medium flow provided to the first consumer can be regulated by the first consumer and the second pressure of the second pressure medium flow provided to the second consumer can be regulated by the second consumer. The first consumer and the second

Consumers are thus advantageously with a respective

Applied pressure medium flow, which corresponds to current requirements for the pressure medium supply.

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.

Brief description of the drawings

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:

Fig. 1 is a schematic representation of a positive displacement pump in one

Top view with lid removed according to a preferred embodiment of the invention;

Fig. 2 is a schematic representation of the positive displacement pump in one

Top view without rotor and with the cover removed according to the preferred embodiment of the invention; and

Fig. 3 is a sectional view of the positive displacement pump 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 schematic representation of a positive displacement pump 10 in a plan view with the cover 24 removed according to a preferred embodiment of the invention.

The displacement pump 10 is preferably designed as a vane pump. Alternatively, the positive displacement pump 10 may be formed, for example, as a pump of a different type. The positive displacement pump 10 preferably has a first working chamber 12 and a second working chamber 14. The first working chamber 12 preferably has an inlet chamber 12a and an outlet chamber 12b. The second working chamber 14 preferably has an inlet chamber 14a and an outlet chamber 14b. The first inlet chamber 12a is preferably connected to a suction port (not shown in FIG. 1) and can be supplied via this with a pressure medium. The second inlet chamber 14a is preferably connected to a suction port (not shown in FIG. 1) and can be supplied with a pressure medium via the latter.

The displacement pump 10 further includes a rotor 25 inserted into the housing 21 of the positive displacement pump 10, in which a plurality of rear wing channels 25a are formed. The positive displacement pump 10 has Moreover, a cam ring 28 on. The cam ring 28 preferably has an asymmetrical cross-section. The first working chamber 12 and the second working chamber 14 of the displacement pump 10 formed between the rotor 25 and the cam ring 28 used in the positive displacement pump 10 preferably have a different volume.

With the positive displacement pump 10, a first delivery volume of a pressure medium is thus provided to a first consumer (not shown in FIG. 1) and a second delivery volume of the pressure medium, which is different from the first delivery volume of the pressure medium, to a second consumer (not shown in FIG ,

In addition, the first pressure PI generated in the discharge chamber 12b of the first working chamber 12 and the second pressure P2 generated in the discharge chamber 14b of the second working chamber 14 may have a different amount. Preferably, the first pressure PI of the first pressure medium flow provided to the first consumer (not shown in FIG. 1) is controllable by the first consumer and the second pressure P2 of the second pressure medium flow provided to the second consumer (not shown in FIG second consumer regulated.

Alternatively, the cam ring 28 of the positive displacement pump 10 may, for example, have a symmetrical cross section. The between the in the

Positive displacement pump 10 used rotor 25 and the cam ring 28th

trained first working chamber 12 and second working chamber 14 of the

Positive displacement pump 10 then preferably have an equal volume. Thus, the first load (not shown in FIG. 1) is a first one

Delivery volume of the pressure medium and to the (not shown in Fig. 1) second consumer, a second delivery volume of the pressure medium can be provided, wherein the first delivery volume and the second delivery volume have an equal amount.

The positive displacement pump 10 is preferably designed left-handed. Alternatively, the positive displacement pump 10 may be designed, for example, clockwise or bidirectionally. Fig. 2 shows a schematic representation of the positive displacement pump 10 in a plan view without rotor 25 and with the cover 24 removed according to the preferred embodiment of the invention.

The outlet chamber (not shown in FIG. 2) of the first working chamber is preferably connected to a first pressure port 22a for discharging pressure medium from the positive displacement pump 10 by the first pressure chamber 18a formed in the housing 21 of the positive displacement pump 10. The outlet chamber (not shown in FIG. 2) of the second working chamber is preferably provided by a second pressure chamber 18b formed in the housing 21 of the positive displacement pump 10 with a second pressure port 22b for dispensing

Pressure fluid from the positive displacement pump 10 is connected. The first pressure chamber 18a and the second pressure chamber 18b are fluidly separated from each other.

The pressure medium flows from the outlet chambers are thus feasible in the first pressure chamber 18 a and the second pressure chamber 18 b, wherein in the

Outlet chamber of the first working chamber, a first pressure PI and in the outlet chamber of the second working chamber, a second pressure P2 can be generated. The first pressure PI is preferably available to a first consumer 19 and the second pressure P2 to a second consumer 20.

The first pressure chamber 18a is preferably in the housing 21 of

Positive displacement pump 10 in the axial direction of the housing 21 is substantially congruent to the (not shown in Fig. 2) first working chamber arranged. The second pressure chamber 18b is preferably arranged in the housing 21 of the positive displacement pump 10 in the axial direction of the housing 21 essentially congruent to the second working chamber (not shown in FIG. 2).

The first pressure port 22a of the positive displacement pump 10 is preferably connected to the first consumer 19 by a pressure medium line 29. The second pressure port 22b of the positive displacement pump 10 is preferably connected to the second consumer 20 by a pressure medium line 30.

In the present embodiment, the positive displacement pump 10 has the first suction port 16 a and the second suction port 16 b, via which the Positive displacement pump 10 can be supplied with pressure medium. Alternatively, the

Positive displacement pump 10, for example, have only one suction port, which is fluidly connected to the first working chamber and the second working chamber of the positive displacement pump 10.

Fig. 3 shows a sectional view of the positive displacement pump 10 according to the preferred embodiment of the invention.

The first pressure chamber 18a and the second pressure chamber 18b of the displacement pump 10 are in the axial direction of the housing 21 preferably through the end plate 23, a cover 24, formed in the rotor 25 (not shown in Fig. 3) Hinterflügelkanal, inserted into the face plate 23 Axialdichtring 26 and the Axialdichtring 26 supporting support ring 27 fluidly separated from each other.

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, a geometry of the first and second pressure chamber can be adapted to the respective structural requirements as well as requirements with respect to a flow rate and a pressure to be provided. Furthermore, a size of the displacement pump 10 is arbitrarily scalable depending on the requirement.

LIST OF REFERENCE NUMBERS

1 hydraulic system

10 positive displacement pump

12 first working chamber

12a, 14a inlet chamber

14 second working chamber

12b, 14b outlet chamber

16a first suction connection

16b second suction connection

18a first pressure chamber

18b second pressure chamber

19 first consumer

20 second consumer

21 housing

22a first pressure connection

22b second pressure connection

23 brow plate

24 lids

25 rotor

26 axial sealing ring

27 support ring

28 curve ring

PI first pressure

P2 second pressure

Claims

Displacement pump (10), in particular vane pump for a

Motor vehicle, having a first working chamber (12) and a second working chamber (14) which each have an inlet chamber (12a, 14a) for forming a pump suction side and an outlet chamber (12b, 14b) for forming a pump pressure side, the inlet chambers (12a , 14a) via at least one suction port (16a, 16b) can be supplied with a pressure medium, characterized in that the pressure medium flows from the outlet chambers (12b, 14b) in each a pressure chamber (18a, 18b) are feasible, wherein in the outlet chamber (12b ) of the first working chamber (12) a first pressure (P1) and in the outlet chamber (14b) of the second

Working chamber (14), a second pressure (P2) can be generated, and wherein the first pressure (P1) to a first consumer (19) and the second pressure (P2) to a second consumer (20) can be provided.

Positive displacement pump according to claim 1, characterized in that the outlet chamber (12b) of the first working chamber (12) in a housing (21) of the positive displacement pump (10) formed first pressure chamber (18a) with a first pressure port (22a) for discharging pressure medium from the positive displacement pump (10), and the outlet chamber (14b) of the second working chamber (14) through a in the housing (21) of the positive displacement pump (10) formed second pressure chamber (18b) with a second pressure port (22b) for dispensing Pressure medium from the

Positive displacement pump (10) is connected, wherein the first pressure chamber (18a) and the second pressure chamber (18b) are fluidly separated from each other.

Positive displacement pump according to claim 1 or 2, characterized in that the first pressure chamber (18a) in the housing (21) of the positive displacement pump (10) in the axial direction of the housing (21) is arranged substantially congruent to the first working chamber (12) and the second Pressure chamber (18 b) in the housing (21) of the positive displacement pump (10) in the axial direction of the Housing (21) substantially congruent to the second

Working chamber (14) is arranged.

Positive displacement pump according to one of the preceding claims, characterized in that the first pressure chamber (18a) and the second pressure chamber (18b) in the axial direction of the housing (21) by an end plate (23), a cover (24), in the rotor (25 ) formed Hinterflügelkanal, one in the end plate (23) inserted Axialdichtring (26) and a Axialdichtring (26) supporting the support ring (27) are fluidly separated from each other.

Positive displacement pump according to claim 4, characterized in that a cam ring (28) of the positive displacement pump (10) is asymmetrical

Cross-section, wherein between the in the positive displacement pump (10) inserted rotor (25) and the cam ring (28) formed first working chamber (12) and second working chamber (14) of the positive displacement pump (10) have a different volume.

Positive displacement pump according to one of the preceding claims, characterized in that the first consumer (19) has a first

Delivery volume of the pressure medium and to the second consumer (20) is different from the first delivery volume of the pressure medium second delivery volume of the pressure medium is provided.

Positive displacement pump according to one of claims 1 to 4, characterized

characterized in that a cam ring (28) of the positive displacement pump (10) has a symmetrical cross section, the first working chamber (12) and second working chamber (14) formed between the rotor (25) inserted into the positive displacement pump (10) and the cam ring (28) ) of the positive displacement pump (10) have an equal volume.

Positive displacement pump according to one of claims 1 to 4 and 7, characterized in that the first consumer (19) a first

Delivery volume of the pressure medium and to the second consumer (20) a second delivery volume of the pressure medium is provided, wherein the first delivery volume and the second delivery volume have an equal amount.

9. positive displacement pump according to one of the preceding claims, characterized in that in the outlet chamber (12 b) of the first

Working chamber (12) generated first pressure (P1) and in the outlet chamber (14b) of the second working chamber (14) generated second pressure (P2) have a different amount.

10. positive displacement pump according to one of the preceding claims, characterized in that the positive displacement pump (10) has a first

Suction port (16 a) which is connected to the inlet chamber (12 a) of the first working chamber (12) and a second suction port (16 b) which communicates with the inlet chamber (12 a) of the second

Working chamber (14) is connected.

1 1. Positive displacement pump according to one of the preceding claims, characterized in that the positive displacement pump (10) is designed counterclockwise and / or clockwise.

12. A hydraulic system (1) for a motor vehicle, comprising:

a positive displacement pump according to any one of claims 1 to 11;

a first consumer (19), to which by the positive displacement pump (10) a pressure medium with a first pressure (P1) can be provided; and

a second consumer (20), to which by the positive displacement pump

(10) a pressure medium with a second pressure (P2) can be provided.

13. A hydraulic system according to claim 12, characterized in that the first pressure (PI) of the first consumer (19) provided first pressure medium flow through the first consumer (19) is controllable and the second pressure (P2) of the second consumer (20) provided second pressure medium flow through the second consumer (20) is controllable.