WO2017021118A1

WO2017021118A1 - Positive displacement pump and hydraulic system

Info

Publication number: WO2017021118A1
Application number: PCT/EP2016/066647
Authority: WO
Inventors: Ramazan GÖKÖZ; Stephan Grießer
Original assignee: Robert Bosch Automotive Steering Gmbh
Priority date: 2015-08-05
Filing date: 2016-07-13
Publication date: 2017-02-09
Also published as: DE102015112829A1

Abstract

The invention relates to a positive displacement pump (10), in particular a vane pump, for conveying a fluid for a consumer (2) in a motor vehicle, wherein the suction connection (14) is parallel to the return connection (16) at a connection surface (10a) of the positive displacement pump (10), the suction channel (15) and the return channel (17) being designed in such a way that a fluid flow of the return channel (17) hits a fluid flow of the suction channel (15) at a predefined angle (α, ß). The invention also relates to a hydraulic system (1) for a motor vehicle.

Description

description

title

Displacement pump and hydraulic system 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 hydraulic system for a motor vehicle. State of the art

Displacement pumps, in which the consumer recirculated fluid is passed in a return port in a pressure chamber, are known. The pressure chamber has an outlet opening to the suction space in the pump, the cross section of which is smaller than the cross section of the fluid

leading return connection. As a result of this configuration, the fluid supplied is accelerated through the narrower outlet when it passes into the suction region. In this way, the fluid entering the suction chamber at high speed should entrain existing fluid there, and the

Feed the suction area to the pump.

DE 10 2012 100 702 AI discloses a vane pump for a transmission or for a power steering system of a motor vehicle for supplying a fluid, wherein for charging a provided with a pressure medium inlet suction duct in the pump returned, pressurized fluid passed through a return port in the suction channel becomes, whereby the

Return connection opens approximately tangentially in the annular suction channel.

Due to space requirements, however, the return connection of the pump can not always be arranged tangentially to a suction channel of the pump.

It would therefore be desirable to provide a positive displacement pump in which the tangential supply of the pressurized return fluid in the suction channel is also possible if the return port on the housing can not be arranged perpendicular to the suction channel. The invention is therefore based on the object to provide a positive displacement pump in which the tangential supply of the pressurized return fluid is made possible in the suction channel, even if the

Return port on the housing can not be provided perpendicular to the suction channel.

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

Vane pump for conveying a fluid for a consumer of a motor vehicle, having the features of claim 1. Furthermore, the object is achieved with a hydraulic system for a motor vehicle having the features of patent claim 10.

Disclosure of the invention

The present invention provides a positive displacement pump, in particular a vane pump for delivering a fluid to a consumer of a

Motor vehicle, wherein the suction port is arranged parallel to the return port on a connection surface of the positive displacement pump, wherein the suction channel and the return channel are formed such that a

Fluid flow of the return passage a fluid flow of the suction channel acted upon at a predetermined angle.

The present invention further provides a hydraulic system for a motor vehicle having a positive displacement pump and a consumer, to which by the positive displacement pump, a fluid having a definable pressure

is available.

An idea of the present invention is to provide a positive displacement pump,

In particular, to provide a vane pump for conveying a fluid for a consumer of a motor vehicle, which advantageously in a tangential supply of the pressurized return fluid in the

Suction channel allows, even if the return port on the housing is not can be arranged perpendicular to the suction channel. The arrangement of the

Suction connection and the injector connection to the connection surface of the positive displacement pump further leads advantageously to a

Space savings and thus a more compact design of the positive displacement pump.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures. According to a preferred development, it is provided that the suction channel has a deflection section which is designed to divert the fluid flow entering the suction connection in the direction of the fluid flow emerging from the return channel such that the fluid flow of the return channel acts on the fluid flow of the suction channel at the predetermined angle , Thus, advantageously by generating a

Vacuum in the suction passage, an acceleration of the flowing in the suction passage fluid can be achieved, although the suction port is arranged parallel to the return port on the connection surface of the positive displacement pump. According to a further preferred embodiment, it is provided that the fluid flow entering into the suction area at an angle of 1 ° to 90 °, preferably at an angle of 45 ° to 90 °, in the direction of the

Return channel exiting fluid flow is deflected. The angle of deflection of the entering into the suction fluid flow is thus preferably in accordance with structural requirements and / or according to

Space requirements of the positive displacement pump and performance parameters of the positive displacement pump selectable.

According to a further preferred embodiment, it is provided that the adjoining the return port, opening into the suction channel,

Return passage substantially perpendicular to the pad of the

Positive displacement pump is arranged. Thus, an optimal acceleration of the entering into the return port fluid flow can be made possible. According to a further preferred embodiment, it is provided that the

Diverting portion of the suction channel adjacent to the suction port is arranged, and wherein a subsequent to the deflection section line section of the suction channel has a widening cross-section. Thus, the return channel can advantageously be kept short and the fluid flow entering the suction port can be optimally loaded with the fluid flow emerging from the return channel.

According to a further preferred development, it is provided that the line section of the suction channel adjoining the deflection section has a first wall section adjacent to the return channel, which is arranged substantially perpendicular to the return channel, and has a second wall section which is at an angle of 1 ° to 90 °, preferably at an angle of 45 ° to 90 °, is arranged to the return channel. Thus, the emerging from the return channel

Fluid flow to optimally pressurize the fluid flow of the suction channel. Furthermore, the positive displacement pump advantageously has a compact design

Dimensions because the return port is positioned immediately adjacent to the suction port.

According to a further preferred development, it is provided that the return duct has a deflection section which is designed to divert the fluid flow entering the return port in the direction of the fluid flow flowing in the suction duct in such a way that the

Fluid flow of the return passage, the fluid flow of the suction channel acted upon at the predetermined angle. Thus, advantageously, by generating a negative pressure in the suction channel, an acceleration of the fluid flowing in the suction channel can be achieved, although the suction connection parallel to the return connection at the connection surface of the

Positive displacement pump is arranged. According to a further preferred development, it is provided that the fluid flow entering the return port can be deflected in an angle of 1 ° to 90 °, preferably at an angle of 45 ° to 90 °, in the direction of the fluid flow flowing in the suction channel. The angle of the deflection of entering the return port

Fluid flow is thus preferably according to structural requirements and / or according to space requirements of the positive displacement pump and performance parameters of the positive displacement pump selectable.

According to a further preferred development, it is provided that the suction channel adjoining the suction connection is arranged essentially perpendicular to the connection surface of the positive displacement pump. Thus, the entering into the suction port fluid flow can be conducted in an advantageous manner without deflection in the suction channel of the positive displacement pump.

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:

1 is a schematic representation of a positive displacement pump,

in particular a connection surface of the positive displacement pump, according to a preferred embodiment of the invention;

Fig. 2 is a sectional view of the positive displacement pump according to the preferred

Embodiment of the invention; and Fig. 3 is a sectional view of the positive displacement pump according to another 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.

1 shows a schematic representation of a positive displacement pump,

in particular a connection surface of the positive displacement pump, 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 displacement pump 10 preferably has a connection surface 10a on which, inter alia, a suction connection 14 and a return connection 16 are arranged. The suction port 14 serves to supply fluid into the positive displacement pump 10, and the return port 16 serves to supply reflux fluid to the positive displacement pump 10. In the present embodiment, the return port 16 is in the axial direction of the

Positive displacement pump 10 is arranged above the suction port 14. Alternatively, the return port 16 may be disposed, for example, at a suitable other position on the pad 10a of the positive displacement pump 10. The connection surface 10a of the positive displacement pump 10 is preferably flat. Alternatively, the connection surface 10a of the positive displacement pump 10 may, for example, have a curvature.

Fig. 2 shows a sectional view of the positive displacement pump according to the preferred embodiment of the invention.

The return connection 16 is preferably arranged adjacent to the suction connection 14 on the connection surface 10a of the displacement pump 10. At the suction port 14, a suction channel 15 connects in an advantageous manner. At the return port 16 is closed in an advantageous manner in the

Suction channel 15 opening return channel 17 at. The return port 16 and the return passage 17 adjoining the return port 16 are arranged substantially perpendicular to the connection surface 10a of the positive displacement pump 10 and preferably have a tapered shape in order to ensure optimum acceleration of the fluid flow entering the return port 16.

The fluid flow emerging from the return channel 17 preferably acts approximately tangentially on the fluid flow of the suction channel. Alternatively, the suction channel 15 may be formed, for example, such that the fluid flow emerging from the return channel 17, the fluid flow of the suction channel at another predetermined angle α of 1 ° to 90 °, preferably at an angle α of 45 ° to 90 ° applied.

For this purpose, the suction channel 15 preferably has a deflection section 15a, which is designed to accommodate the suction connection

Redirecting fluid flow in the direction of emerging from the return flow fluid flow so that the fluid flow of the return channel 17, the fluid flow of the suction channel acts approximately tangentially. Alternatively, the deflecting section 15a can be formed, for example, in such a way that the fluid flow entering the suction port 14 is suitable in another suitable one

Angle α from 1 ° to 90 °, preferably at an angle α of 45 ° to 90 °, in the direction of the fluid flow emerging from the return passage 17 is deflected. The deflection section 15a of the suction channel 15 is preferably arranged adjacent to the suction connection 14. A subsequent to the deflection section 15a line section 15b of the suction channel 15 points

preferably a broadening cross section. The line section 15b of the suction channel 15 adjoining the deflection section 15a preferably has a first wall section 15c adjacent to the return channel 17. The first, adjacent to the return passage 17 wall portion 15 c is substantially perpendicular to the

Return channel 17 is arranged. Furthermore, the points to the

Deflection section 15 a subsequent line section 15 b of the suction channel

15 a second wall portion 15d, which at an angle of is arranged approximately 90 ° to the return channel 17. Alternatively, the second wall section 15d can be arranged, for example, at an angle α of 1 ° to 90 °, preferably at an angle α of 45 ° to 90 °, to the return channel 17.

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

In the present embodiment, the suction port 14 is at the

Pad 10 a of the positive displacement pump 10 adjacent to the

Return port 16 is arranged. The suction channel 15 adjoining the suction connection 14 is preferably arranged substantially perpendicular to the connection surface 10a of the displacement pump 10.

To the suction port 14, the suction channel 15 connects in an advantageous manner. The return connection 16 is adjoined in an advantageous manner by the return channel 17 opening into the suction channel 15.

The return channel 17 adjoining the return connection 16 preferably has a deflection section 17a. The deflection section 17a is preferably designed to divert the fluid flow entering the return port 16 in the direction of the fluid flow flowing in the suction channel 15 in such a way that the fluid flow of the fluid flows through the fluid flow

Return channel 17, the fluid flow of the suction channel 15 approximately tangentially acted upon.

Alternatively, the deflection portion 15a of the return passage 17 may be formed such that the entering into the return port 16

Fluid flow at a predetermined angle ß of 1 ° to 90 °, preferably at an angle ß of 45 ° to 90 °, in the direction of the fluid flow flowing in the suction channel 15 is deflected.

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 in change or modify in various ways without deviating from the gist of the invention.

For example, a geometry of the suction channel and / or the return channel to structural requirements and requirements for a flow rate of the positive displacement pump adaptable. Furthermore, a size of

Displacement pump or an associated cross-section of the suction channel and the return channel scalable.

LIST OF REFERENCE NUMBERS

1 hydraulic system

2 consumers

10 positive displacement pump

10a Connection surface of the positive displacement pump

12 housing

14 suction connection

15 suction channel

15a deflection section of the suction channel

15b line section of the suction channel

15c first wall portion of the suction channel

15d second wall section of the suction channel

16 return connection

17 return channel

17a deflection section of the return channel α, ß angle

Claims

Displacement pump (10), in particular vane pump for delivering a fluid to a consumer (2) of a motor vehicle, comprising a housing (12) to which a suction port (14) for supplying fluid into the positive displacement pump (10) and a return port (16) for the supply of return fluid in the positive displacement pump (10) are arranged, wherein the positive displacement pump (10) is connected to the suction port (14)

has a subsequent suction channel (15) and a return channel (17) which opens into the return port (16) and opens into the suction channel (15), characterized in that the suction port (14) is parallel to the return port (16) at a connection surface (16). 10a) of

Positive displacement pump (10) is arranged, wherein the suction channel (15) and the return channel (17) are formed such that a fluid flow of the return channel (17) a fluid flow of the suction channel (15) at a predetermined angle (a, ß) acted upon.

Positive displacement pump according to claim 1, characterized in that the suction channel (15) has a deflection portion (15a) which is adapted to the entering into the suction port (14) fluid flow in the direction of the from the return passage (17) exiting

Redirecting fluid flow, that the fluid flow of the return channel (17) acts on the fluid flow of the suction channel (15) at the predetermined angle (a).

Positive displacement pump according to claim 2, characterized in that in the suction port (14) entering fluid flow at an angle (a) of 1 ° to 90 °, preferably at an angle (a) of 45 ° to 90 ° in the direction of the return channel (17) emerging fluid flow is deflectable. Positive displacement pump according to one of claims 1 to 3, characterized

characterized in that at the return port (16)

subsequent, in the suction channel (15) opening, return channel (17) is arranged substantially perpendicular to the connection surface (10a) of the positive displacement pump (10).

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

in that the deflection section (15a) of the suction channel (15) is arranged adjacent to the suction connection (14), and wherein a line section (15b) of the suction channel (15) adjoining the deflection section (15a) has a widening cross-section.

Positive displacement pump according to one of claims 1 to 5, characterized

characterized in that the line section (15b) of the suction channel (15) adjoining the deflection section (15a) has a first wall section (15c) which is adjacent to the return channel (17) and which is arranged substantially perpendicular to the return channel (17), and a second wall portion (15d) disposed at an angle (a) of 1 ° to 90 °, preferably at an angle (a) of 45 ° to 90 ° to the return passage (17).

Positive displacement pump according to claim 1, characterized in that the return channel (17) has a deflection section (17a) which is adapted to redirect the fluid flow entering the return port (16) in the direction of the fluid flow flowing in the suction channel (15) the fluid flow of the return channel (17) the

Fluid flow of the suction channel (15) in the predetermined angle (ß) acted upon.

Positive displacement pump according to claim 7, characterized in that in the return port (16) entering fluid flow at an angle (ß) of 1 ° to 90 °, preferably at an angle (ß) of 45 ° to 90 ° in the direction of the in the suction channel (15) flowing fluid flow is deflectable.

9. positive displacement pump according to one of claims 1, 7 and 8, characterized in that the suction port (14) adjoining the suction channel (15) is arranged substantially perpendicular to the connection surface (10a) of the positive displacement pump (10).

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

a positive displacement pump (10) according to any one of claims 1 to 9; and a consumer (2) to which a fluid with a definable pressure can be provided by the positive displacement pump (10).