1 - 3 Positive displacement pump and hydraulic system

Abstract

Positive displacement pump (10), in particular a vane pump for conveying a fluid for a consumer (2) of a motor vehicle, comprising a housing (12) on which a suction connection (14) for supplying fluid to the positive displacement pump (10) and a return connection (16) for supplying return fluid to the positive displacement pump (10) are arranged, wherein the positive displacement pump (10) has a suction channel (15) adjoining the suction connection (14) and a return channel (17) adjoining the return connection (16) and opening into the suction channel (15), wherein the suction connection (14) is arranged parallel to the return connection (16) on a connection surface (10a) of the positive displacement pump (10), wherein the suction channel (15) and the return channel (17) are designed such that a fluid flow of the return channel (17) (15) at a predetermined angle (α), characterized in that the suction channel (15) has a deflection section (15a),which is designed to redirect the fluid flow entering the suction connection (14) in the direction of the fluid flow exiting from the return channel (17) in such a way that the fluid flow of the return channel (17) acts on the fluid flow of the suction channel (15) at the predetermined angle (α), and wherein the return channel (17) adjoining the return connection (16) and opening into the suction channel (15) is arranged substantially perpendicular to the connection surface (10a) of the positive displacement pump (10).

Description

[0001] 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 further relates to a hydraulic system for a motor vehicle. State of the art

[0002] Positive displacement pumps in which fluid returned from the consumer is fed into a pressure chamber via a return connection are known. The pressure chamber has an outlet opening into the suction chamber in the pump, the cross-section of which is smaller than the cross-section of the return connection supplying the fluid. This design accelerates the supplied fluid as it passes through the narrower outlet as it enters the suction area. In this way, the fluid entering the suction chamber at high velocity is intended to entrain any fluid present there and supply it to the suction area of ​​the pump.

[0003] DE 10 2012 100 702 A1 discloses a vane pump for a transmission or for an auxiliary power steering system of a motor vehicle for supplying a fluid, wherein, in order to charge a suction channel provided with a pressure medium inlet in the pump, pressurized fluid returned is passed into the suction channel via a return connection, wherein the return connection opens approximately tangentially into the annular suction channel.

[0004] However, due to space constraints, the pump's return port cannot always be positioned tangentially to a pump's suction channel. It would therefore be desirable to provide a positive displacement pump that allows the tangential supply of the pressurized return fluid to the suction channel even if the return port on the housing cannot be positioned perpendicular to the suction channel.

[0005] For further information on the state of the art, reference is made to DE 10 2009 026 964 A1, DE 10 2007 015 145 A1, DE 10 2009 050 143 A1 and JP S64-63675 A.

[0006] The invention is therefore based on the object of providing a positive displacement pump in which the tangential supply of the pressurized return fluid into the suction channel is made possible, even if the return connection on the housing cannot be provided perpendicular to the suction channel.

[0007] 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, having the features of patent claim 1. Furthermore, the object is achieved with a hydraulic system for a motor vehicle having the features of patent claim 5. Disclosure of the invention

[0008] 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 suction connection is arranged parallel to the return connection on a connection surface of the positive displacement pump, wherein the suction channel and the return channel are designed such that a fluid flow of the return channel acts on a fluid flow of the suction channel at a predetermined angle.

[0009] The present invention further provides a hydraulic system for a motor vehicle having a positive displacement pump and a consumer to which a fluid having a definable pressure can be provided by the positive displacement pump.

[0010] One idea of ​​the present invention is to provide a positive displacement pump, in particular a vane pump, for conveying a fluid for a consumer of a motor vehicle, which advantageously enables a tangential supply of the pressurized return fluid into the suction channel, even if the return connection on the housing cannot be arranged perpendicular to the suction channel. The arrangement of the suction connection and the injector connection on the connection surface of the positive displacement pump also advantageously leads to space savings and thus a more compact design of the positive displacement pump.

[0011] Advantageous embodiments and further developments emerge from the subclaims and from the description with reference to the figures.

[0012] According to the invention, the suction channel has a deflection section designed to deflect the fluid flow entering the suction port in the direction of the fluid flow exiting 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, by generating a negative pressure in the suction channel, an acceleration of the fluid flowing in the suction channel can be advantageously achieved, even though the suction port is arranged parallel to the return port on the connection surface of the positive displacement pump.

[0013] According to a preferred development, the fluid flow entering the suction area can be deflected at an angle of 1° to 90°, preferably at an angle of 45° to 90°, in the direction of the fluid flow exiting the return channel. The angle of deflection of the fluid flow entering the suction port can thus preferably be selected according to structural requirements and / or the space requirements of the positive displacement pump as well as the performance parameters of the positive displacement pump.

[0014] According to a further preferred embodiment, the return channel adjoining the return connection and opening into the suction channel is arranged substantially perpendicular to the connection surface of the positive displacement pump. This enables optimal acceleration of the fluid flow entering the return connection.

[0015] According to the invention, the deflection section of the suction channel is arranged adjacent to the suction connection, and a line section of the suction channel adjoining the deflection section has a widening cross-section. Thus, the return channel can advantageously be kept short, and the fluid flow entering the suction connection can be optimally charged with the fluid flow exiting the return channel.

[0016] According to a further preferred development, 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 a second wall section arranged at an angle of 1° to 90°, preferably at an angle of 45° to 90°, to the return channel. Thus, the fluid flow emerging from the return channel can optimally impinge on the fluid flow of the suction channel. Furthermore, the positive displacement pump advantageously has compact dimensions, since the return connection can be positioned directly adjacent to the suction connection.

[0017] The described designs and further training courses can be combined as desired.

[0018] Further possible embodiments, developments and implementations of the invention also include combinations of features of the invention described previously or below with regard to the embodiments that are not explicitly mentioned. Short description of the drawings

[0019] 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.

[0020] Other embodiments and many of the aforementioned advantages will become apparent upon review of the drawings. The elements illustrated in the drawings are not necessarily drawn to scale.

[0021] They show: Fig. 1 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 a sectional view of the positive displacement pump according to the preferred embodiment of the invention.

[0022] In the figures of the drawings, the same reference symbols designate the same or functionally equivalent elements, parts or components, unless otherwise stated.

[0023] Fig. 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.

[0024] The positive displacement pump 10 is preferably designed as a vane pump. Alternatively, the positive displacement pump 10 can be designed, for example, as a pump of a different design. The positive displacement pump 10 preferably has a connection surface 10a on which, among other things, a suction port 14 and a return port 16 are arranged. The suction port 14 serves to supply fluid to the positive displacement pump 10, and the return port 16 serves to supply return fluid to the positive displacement pump 10. In the present exemplary embodiment, the return port 16 is arranged above the suction port 14 in the axial direction of the positive displacement pump 10. Alternatively, the return port 16 can be arranged, for example, at a suitable other position on the connection surface 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 can, for example, have a curvature.

[0025] Fig. 2 shows a sectional view of the positive displacement pump according to the preferred embodiment of the invention.

[0026] The return connection 16 is preferably arranged adjacent to the suction connection 14 on the connection surface 10a of the positive displacement pump 10. A suction channel 15 advantageously adjoins the suction connection 14. A return channel 17 leading into the suction channel 15 advantageously adjoins the return connection 16.

[0027] The return connection 16 and the return channel 17 adjoining the return connection 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 optimal acceleration of the fluid flow entering the return connection 16.

[0028] The fluid flow exiting the return channel 17 preferably acts upon the fluid flow of the suction channel approximately tangentially. Alternatively, the suction channel 15 can be configured, for example, such that the fluid flow exiting the return channel 17 acts upon 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°.

[0029] For this purpose, the suction channel 15 preferably has a deflection section 15a, which is designed to deflect the fluid flow entering the suction port in the direction of the fluid flow exiting the return channel such that the fluid flow of the return channel 17 acts approximately tangentially on the fluid flow of the suction channel. Alternatively, the deflection section 15a can be designed, for example, such that the fluid flow entering the suction port 14 can be deflected at another suitable angle α of 1° to 90°, preferably at an angle α of 45° to 90°, in the direction of the fluid flow exiting the return channel 17.

[0030] The deflection section 15a of the suction channel 15 is preferably arranged adjacent to the suction connection 14. A line section 15b of the suction channel 15 adjoining the deflection section 15a preferably has a widening cross-section.

[0031] 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 wall section 15c adjacent to the return channel 17 is arranged substantially perpendicular to the return channel 17. Furthermore, the line section 15b of the suction channel 15 adjoining the deflection section 15a has a second wall section 15d, which is arranged at an angle of 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.

[0032] Although the present invention has been described above using preferred embodiments, it is not limited thereto, but can be modified in a variety of ways. In particular, the invention can be changed or modified in a variety of ways without deviating from the essence of the invention.

[0033] For example, the geometry of the suction channel and / or the return channel can be adapted to structural requirements as well as the flow rate requirements of the positive displacement pump. Furthermore, the size of the positive displacement pump and the associated cross-section of the suction channel and the return channel can be scaled as required. List of reference symbols 1 hydraulic system 2 consumers 10 positive displacement pump 10a Connection surface of the displacement pump 12 housings 14 Suction connection 15 Suction channel 15a Deflection section of the suction channel 15b Section of the suction channel 15c first wall section of the suction channel 15d second wall section of the suction channel 16 Return connection 17 Return channel

Claims

[1] Positive displacement pump (10), in particular a vane pump for pumping a fluid for a consumer (2) of a motor vehicle, with a housing (12) on which a suction port (14) for supplying fluid to the positive displacement pump (10) and a return port (16) for supplying return fluid to the positive displacement pump (10) are arranged, wherein the positive displacement pump (10) has a suction channel (15) adjoining the suction port (14) and a return channel (17) adjoining the return port (16) and opening into the suction channel (15), wherein the suction port (14) is arranged parallel to the return port (16) on a connection surface (10a) of the positive displacement pump (10), wherein the suction channel (15) and the return channel (17) are designed such that a fluid flow of the return channel (17) is a fluid flow of the suction channel (15) applied at a predetermined angle (α), characterized by, that the suction channel (15) has a deflection section (15a) which is designed to deflect the fluid flow entering the suction port (14) in such a way as to deflect the fluid flow exiting the return channel (17) in such a way that the fluid flow of the return channel (17) acts upon the fluid flow of the suction channel (15) at the specified angle (α), and wherein the return channel (17) adjoining the return port (16) and opening into the suction channel (15) is arranged substantially perpendicular to the connection surface (10a) of the positive displacement pump (10). [2] Positive displacement pump according to claim 1, characterized by , that the fluid flow entering the suction port (14) can be deflected at an angle (α) of 1° to 90°, preferably at an angle (α) of 45° to 90° in the direction of the fluid flow exiting the return channel (17). [3] Positive displacement pump according to one of claims 1 or 2, characterized by, that the deflection section (15a) of the suction channel (15) is arranged adjacent to the suction port (14), and wherein a conduit section (15b) of the suction channel (15) adjoining the deflection section (15a) has a widening cross-section. [4] Positive displacement pump according to one of claims 1 to 3, characterized by , that the conduit section (15b) of the suction channel (15) adjoining the deflection section (15a) has a first wall section (15c) adjacent to the return channel (17), which is arranged substantially perpendicular to the return channel (17), and a second wall section (15d) which is arranged at an angle (α) of 1° to 90°, preferably at an angle (α) of 45° to 90° to the return channel (17). [5] Hydraulic system (1) for a motor vehicle, comprising: a positive displacement pump (10) according to one of claims 1 to 4; and a consumer (2) to which a fluid with a definable pressure can be supplied by the positive displacement pump (10).

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