DE102017217068B4 - positive displacement pump, steering system and gearbox - Google Patents

Abstract

Positive displacement pump (1), in particular vane pump, for delivering a fluid (F) for a consumer (2; 3) of a motor vehicle, with a pump housing (10) and a cover (12) closing the pump housing (10); with a cam ring (14) inserted into the pump housing (10); and with an end plate (16) arranged between the cam ring (14) and the pump housing (10), the cam ring (14) bearing against the cover (12) or a cover-side control plate between the cam ring (14) and the cover (12). (18), wherein a rotor (22) mounted by a drive shaft (20) is inserted into the cam ring (14), wherein between the cam ring (14) and the rotor (22) a first working chamber (24) and one of second working chamber (26) arranged separately from the first working chamber (24), which are delimited in the axial direction by the cover (12) or the cover-side control plate (18) and the end plate (16), the cover (12) or the cover-side control plate (18) and/or the front plate (16) has a suction opening (28) and a first suction kidney (30) and second suction kidney (32) communicating fluidically with the suction opening (28), the first suction kidney (30) being designed for this purpose is to supply fluid (F) into the first working chamber (24) and the second suction kidney (32) is designed to supply fluid (F) into the second working chamber (26), characterized in that the first suction kidney (30) and the second suction kidney (32) open into the suction opening (28) at a first end section (30a, 32a) and are fluidically connected to one another at a second end section (30b, 32b) by a connecting channel (34).

Description

The invention relates to a displacement pump, in particular a vane pump, for delivering a fluid to a consumer in 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.

State of the art

Conventionally, displacement pumps have a pump housing and a cover that closes the pump housing, as well as a cam ring that is inserted into the pump housing. Furthermore, displacement pumps have an end plate arranged between the cam ring and the pump housing, the cam ring bearing against the cover or a cover-side control plate being arranged between the cam ring and the cover. In addition, the pump housing can be integrated in a consumer.

A rotor supported by a drive shaft is typically inserted into the cam ring, with a first working chamber and a second working chamber, which is arranged separately from the first working chamber, being formed between the cam ring and the rotor are limited, wherein the cover or the cover-side control plate and/or the front plate has a suction opening and a first suction pocket and a second suction pocket communicating fluidically with the suction opening, the first suction pocket being designed to supply fluid to the first working chamber and the second suction pocket to supply fluid to it is designed to supply fluid into the second working chamber.

The DE 10 2007 006 716 A1 discloses a displacement pump for motor vehicles with a housing that supports a set of rotors, which is formed at least from a rotor and blocking elements, at least one working chamber, which is divided into working cells by the blocking elements, the working chamber being limited laterally, and a pump suction opening and a pump pressure opening .

The DE 10 2016 111 770 A1 discloses a vane pump for delivering a fluid for a consumer of a motor vehicle and a method for operating a vane pump. A recess is provided in an end plate. The recess has an inclination falling from a suction port-side end portion of the recess to a discharge port-side end portion of the recess.

For further prior art is also on the U.S. 6,139,285 A referred, which also discloses a vane pump. Furthermore, on the WO 2014/147914 A1 referenced, which discloses a vane pump with a cam ring inserted into the pump housing.

The invention is therefore based on the object of providing an improved displacement pump which enables the working chambers to be filled more effectively.

The object is achieved with a displacement pump having the features of claim 1. The object is also achieved with a steering system for a motor vehicle having the features of patent claim 10 . The object is also achieved with a transmission for a motor vehicle with the features of patent claim 12.

Disclosure of Invention

The present invention provides a displacement pump, in particular a vane pump, for delivering a fluid for a consumer in a motor vehicle, the first suction cup and the second suction cup opening into the suction opening at a first end section and being fluidically connected to one another at a second end section by a connecting channel.

The present invention also creates a steering system for a motor vehicle with at least one consumer and the displacement pump according to the invention for delivering a fluid for the at least one consumer of the steering system.

The present invention also creates a transmission for a motor vehicle with at least one consumer and the displacement pump according to the invention for delivering a fluid for the at least one consumer of the transmission.

One idea of the present invention is to provide improved filling of the working chambers by providing the connecting channel between the first suction pocket and the second suction pocket. Due to the mostly different geometry of the first suction cup and the second suction cup, i.e. a different length and/or a different volume, functional and/or acoustic problems can usually occur in an upper speed range of the displacement pump.

These can be effectively prevented by the provision of the connecting channel between the first suction pocket and the second suction pocket, since a volume of the fluid present in the connecting channel also comes from a working chamber can be sucked in, which would otherwise have a lack of filling.

It can thus be ensured on the one hand that respective delivery chambers of the first working chamber and the second working chamber can always be filled with an identical volume of fluid, regardless of a possibly different geometry of the first suction cup and the second suction cup. The connecting channel is thus advantageously able to compensate for a possible lack of filling in one of the working chambers with the fluid volume that can be made available from the other suction cup via the connecting channel.

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

According to a preferred development, it is provided that the first suction cup, the second suction cup and the connecting channel form a fluid channel which surrounds an opening in the cover or the cover-side control plate and/or the end plate for the drive shaft to pass through. Thus, the fluid duct advantageously uses a maximum available installation space of the cover or the cover-side control plate and/or the end plate.

According to a further preferred development, it is provided that a cross section of the connecting channel is smaller than or equal to a smallest cross section of the first suction cup and/or the second suction cup. Due to the design of the connecting channel with a relatively small cross section, it is thus possible to keep a suction pressure of the positive displacement pump at approximately the same level as in a conventional positive displacement pump without a connecting channel, i.e. the positive displacement pump advantageously has an identical maximum speed as without the connecting channel. wherein the connecting channel preferably contributes to the fact that the working chambers of the displacement pump can be reliably filled until the maximum speed is reached.

According to a further preferred development, it is provided that the cross section of the connecting channel is proportional to a delivery capacity of the displacement pump. The cross section of the connecting channel can thus be selected in an advantageous manner in such a way that it is matched to the respective delivery rate of the displacement pump. Depending on the size or delivery rate of the displacement pump, a correspondingly adapted cross section of the connecting channel can thus be selected.

According to a further preferred development, it is provided that the connecting channel forms a section of the fluid channel that is furthest away from the suction opening of the cover or the cover-side control plate and/or the face plate. It can thus be ensured that the best possible fluid equalization can take place between the first pressure kidney and the second pressure kidney or vice versa.

According to a further preferred development, it is provided that the connecting channel is arranged essentially tangentially to the opening of the cover or the cover-side control plate and/or the front plate for the passage of the drive shaft. The tangential arrangement of the connecting channel to the opening of the cover or the cover-side control plate and/or the end plate for the drive shaft to pass through is thus advantageously designed to be streamlined.

According to a further preferred development, it is provided that the connection channel has a first connection section which opens into the first suction cup, a second connection section which opens into the second suction cup and a third connection section formed between the first connection section and the second connection section with an im Has a substantially constant cross-section. The essentially constant cross-section of the third connection section of the connection channel advantageously contributes to maintaining a constant pressure level in the region of the fluid channel.

According to a further preferred development, it is provided that the length of the connecting channel is between 50% and 100%, preferably between 75% and 100%, of a length of the first suction cup and/or the second suction cup.

Forming the connecting channel with such a length has the advantage that the length of the connecting channel is in an optimal ratio to the length of the first suction pocket and the second suction pocket and thus an optimal pressure of the suction area and a resulting optimal response behavior of the displacement pump can be guaranteed.

According to a further preferred development, it is provided that the volume of the connecting channel is between 20% and 90%, preferably between 30% and 80%, particularly preferably between 40% and 70%, of a volume of the first suction cup and/or the second suction cup.

Providing the connecting channel with such a volume has the advantage that in the event of insufficient filling of one of the pressure kidneys, effective fluid equalization can be provided through the connecting channel and at the same time a fluid pressure and a response behavior of the displacement pump can be maintained at an optimal level.

The configurations and developments described can be combined with one another as desired.

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

character list

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

Other embodiments and many of the foregoing advantages will become apparent by reference to 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 Kraftfahrzeugs gemäß einer bevorzugten Ausführungsform der Erfindung;
• 2 eine Längsschnittansicht der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeugs gemäß einer weiteren bevorzugten Ausführungsform der Erfindung;
• 3 eine Querschnittsansicht der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeugs gemäß der bevorzugten Ausführungsform der Erfindung;
• 4 eine Draufsicht eines Pumpengehäuses der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher des Kraftfahrzeugs gemäß der bevorzugten Ausführungsform der Erfindung;
• 5 ein Blockdiagramm eines Lenksystems mit der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher gemäß der bevorzugten Ausführungsform der Erfindung; und
• 6 ein Blockdiagramm eines Getriebes mit der Verdrängerpumpe zur Förderung des Fluides für den Verbraucher gemäß der bevorzugten Ausführungsform der Erfindung.

Show it:

• 1 a longitudinal sectional view of a positive displacement pump for delivering a fluid for a consumer of a motor vehicle according to a preferred embodiment of the invention;
• 2 a longitudinal sectional view of the displacement pump for delivering the fluid for the consumer of the motor vehicle according to a further preferred embodiment of the invention;
• 3 a cross-sectional view of the positive displacement pump for promoting the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention;
• 4 a plan view of a pump housing of the positive displacement pump for delivering the fluid for the consumer of the motor vehicle according to the preferred embodiment of the invention;
• 5 a block diagram of a steering system with the positive displacement pump for delivering the fluid to the consumer according to the preferred embodiment of the invention; and
• 6 a block diagram of a transmission with the positive displacement pump for delivering the fluid to the consumer according to the preferred embodiment of the invention.

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

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

The displacement pump 1 is preferably formed by a vane pump. Alternatively, the displacement pump 1 can be formed, for example, by a pump of a different type, provided that it has at least two working chambers. The displacement pump 1 is used to deliver a fluid F for a (in 1 not shown) consumers of a motor vehicle. The displacement pump 1 has a pump housing 10 and a cover 12 closing the pump housing 10 .

Furthermore, the displacement pump 1 has a cam ring 14 inserted into the pump housing 10 and an end plate arranged between the cam ring 14 and the pump housing 10 , the cam ring 14 resting on the cover 12 .

A rotor supported by a drive shaft 20 is inserted into the cam ring 14 . A first working chamber 24 and a second working chamber 26 which is arranged separately from the first working chamber 24 and are delimited in the axial direction by the cover 12 and the end plate 16 are formed between the cam ring 14 and the rotor 22 .

The cover 12 and the end plate 16 have a suction opening 28 for filling the first working chamber 24 and the second working chamber 26 . The first working chamber 24 has a suction area 24a and the second working chamber 26 has a suction area 26a. The drive shaft 20 is connected to the rotor 22 via a pinion 23 .

Furthermore, the cover 12 and the face plate 16 have the suction opening 28 and a (in 1 not shown) with the suction opening 28 fluidically communicating first suction kidney and second suction kidney, wherein the first suction kidney is designed to supply fluid into the first working chamber 24 and the second suction kidney 32 is designed to supply fluid into the second working chamber 26.

2 shows a longitudinal sectional view of the displacement pump for delivering the fluid for the consumer of the motor vehicle according to a further preferred embodiment of the invention.

In contrast to the in 1 shown embodiment of the positive displacement pump 1 is arranged in the present embodiment between the cam ring 14 and the cover 12, a cover-side control plate 18.

In the present embodiment, therefore, the (in 2 not shown) Suction openings 28 are formed not in the cover 12 but in the cover-side end plate 18 and the end plate 16, with a (in 2 not shown) are provided which communicate fluidically with the suction openings 28 and a second suction kidney, the first suction kidney being designed to supply fluid F into the first working chamber 24 and the second suction kidney 32 being designed to supply fluid F into the second working chamber 26 .

3 12 shows a cross-sectional view of the positive displacement pump for delivering the fluid to the consumer of the motor vehicle according to the preferred embodiment of the invention.

The displacement pump 1 has the first working chamber 24 and the second working chamber 26 . The first working chamber 24 has a suction area 24a and a pressure area 24b. Likewise, the second working chamber 26 has a (in 3 not shown) suction area 26a and a pressure area 26b. A plurality of vanes 27 are also shown, which are movably arranged in respective receptacles in the rotor 22 .

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

The first suction kidney 30 and the second suction kidney 32 each open into the suction opening 28 at a first end section 30a, 32a .

The first suction kidney 30, the second suction kidney 32 and the connecting channel 34 together form a fluid channel 36. The fluid channel 36 surrounds an opening 31 of the lid 12. In the present illustration, the suction kidneys 30, 32 are formed in the lid 12.

Furthermore, respective suction kidneys are in the (in 4 not shown) face plate formed. In the further preferred embodiment, the respective suction kidneys are also formed in the cover-side control plate.

A cross section Q1 of the connecting channel 34 is preferably smaller than or equal to a smallest cross section Q2 of the first suction cup 30 and the second suction cup 32 . Alternatively, the cross section Q1 of the connecting channel 34 can be smaller than or equal to a smallest cross section of the first suction cup or the second suction cup.

Furthermore, the cross section Q1 of the connecting channel 34 is proportional to a delivery rate of the positive displacement pump 1. The connecting channel 34 preferably forms a section 36a of the fluid channel 36 that is furthest away from the suction opening 28 of the cover 12.

Alternatively, the connecting channel 34 can be arranged, for example, at another suitable point in the cover 12, provided the connecting channel retains its advantageous properties.

The connecting channel 34 is arranged essentially tangentially to the opening 31 of the cover 12 . The same applies to the formation of the connecting channel in the (in 4 not shown) cover-side control plate and / or the front plate.

The connection channel 34 also has a first connection section 34a which opens into the first suction kidney 30 . Furthermore, the connection channel 34 has a second connection section 34b which opens into the second suction kidney 32 . In addition, the connection channel 34 has a third connection section 34c formed between the first connection section 34a and the second connection section 34b and having a substantially constant cross section Q1.

A length L of the connecting channel 34 is between 50% and 100%, preferably between 75% and 100% of a length of the first suction kidney 30 and the second suction kidney 32. Alternatively, the length L of the connecting channel 34 is between 50% and 100%, preferably between 75% and 100%, a length of the first suction cup 30 or the second suction cup 32.

Furthermore, a volume V of the connecting channel 34 is between 20% and 90%, preferably between 30% and 80%, particularly preferably between 40% and 70% of a volume of the first suction cup 30 and the second suction cup 32 taken individually, i.e. not cumulatively.

Alternatively, the volume V of the connecting channel 34 can be between 20% and 90%, preferably between 30% and 80%, particularly preferably between 40% and 70%, of the volume of the first suction cup 30 or the second suction cup 32 .

5 Figure 12 shows a block diagram of a steering system with the positive displacement pump for delivering the fluid to the user according to the preferred embodiment of the invention.

The steering system 100 has at least one consumer 2 . Furthermore, the steering system 100 has the displacement pump 1 for delivering the fluid F for the at least one consumer 2 of the steering system.

6 Figure 12 shows a block diagram of a steering system with the positive displacement pump for delivering the fluid to the user according to the preferred embodiment of the invention.

The transmission 200 is in a motor-driven vehicle, in particular in a passenger car or a commercial vehicle. The displacement pump 1 is preferably designed as a vane pump. The displacement pump 1 generates hydraulic pressure for the consumer 3.

Although the present invention has been described above on the basis of preferred exemplary 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 many ways without departing from the essence of the invention.

For example, a shape, dimension, and/or texture of the components of the positive displacement pump may be changed.

Claims (13)

Positive displacement pump (1), in particular vane pump, for delivering a fluid (F) for a consumer (2; 3) of a motor vehicle, with a pump housing (10) and a cover (12) closing the pump housing (10); with a cam ring (14) inserted into the pump housing (10); and with an end plate (16) arranged between the cam ring (14) and the pump housing (10), the cam ring (14) bearing against the cover (12) or a cover-side control plate between the cam ring (14) and the cover (12). (18), wherein a rotor (22) mounted by a drive shaft (20) is inserted into the cam ring (14), wherein between the cam ring (14) and the rotor (22) a first working chamber (24) and one of second working chamber (26) arranged separately from the first working chamber (24), which are delimited in the axial direction by the cover (12) or the cover-side control plate (18) and the end plate (16), the cover (12) or the cover-side control plate (18) and/or the front plate (16) has a suction opening (28) and a first suction kidney (30) and second suction kidney (32) communicating fluidically with the suction opening (28), the first suction kidney (30) being designed for this purpose is to supply fluid (F) into the first working chamber (24) and the second suction kidney (32) is designed to supply fluid (F) into the second working chamber (26), characterized in that the first suction kidney (30) and the second suction kidney (32) open into the suction opening (28) at a first end section (30a, 32a) and are fluidically connected to one another at a second end section (30b, 32b) by a connecting channel (34). positive displacement pump claim 1 , characterized in that the first suction cup (30), the second suction cup (32) and the connecting channel (34) form a fluid channel (36) which has an opening (31) in the cover (12) or the cover-side control plate (18) and / or the end plate (16) for passing through the drive shaft (20) surrounds. positive displacement pump claim 1 or 2 , characterized in that a cross section (Q1) of the connecting channel (34) is smaller than or equal to a smallest cross section (Q2) of the first suction pocket (30) and/or the second suction pocket (32). positive displacement pump claim 3 , characterized in that the cross section (Q1) of the connecting channel (34) is proportional to a delivery rate of the positive displacement pump (1). Positive displacement pump according to one of claims 2 until 4 , characterized in that the connecting channel (34) forms a section (36a) of the fluid channel (36) that is furthest away from the suction opening (28) of the cover (12) or the cover-side control plate (18) and/or the end plate (16). Positive displacement pump according to one of claims 2 until 5 , characterized in that the connecting channel (34) is arranged essentially tangentially to the opening (31) of the cover (12) or the cover-side control plate (18) and/or the end plate (16) for the passage of the drive shaft (20). Positive displacement pump according to one of Claims 1 until 6 , characterized in that the connecting channel (34) has a first connecting section (34a) which opens into the first suction kidney (30), has a second connection section (34b) which opens into the second suction kidney (32) and a third connection section (34a) and the second connection section (34b) formed between the first Connecting portion (34c) having a substantially constant cross section (Q1). Positive displacement pump according to one of the preceding claims, characterized in that a length (L) of the connecting channel (34) is between 50% and 100%, preferably between 75% and 100% of a length of the first suction pocket (30) and/or the second suction pocket ( 32) is. Positive displacement pump according to one of the preceding claims, characterized in that a volume (V) of the connecting channel (34) is between 20% and 90%, preferably between 30% and 80%, particularly preferably between 40% and 70% of a volume of the first suction pocket ( 30) and/or the second suction kidney (32). Steering system (100) for a motor vehicle, having: at least one consumer (2); and a positive displacement pump (1) according to one of Claims 1 until 9 for conveying a fluid (F) for the at least one consumer (2) of the steering system (100). steering system claim 10 , characterized in that the displacement pump (1) is formed by a vane pump. Transmission (200) for a motor vehicle, having: at least one consumer (3); and a positive displacement pump (1) according to one of Claims 1 until 9 for conveying a fluid (F) for the at least one consumer (3) of the transmission (200). gear after claim 12 , characterized in that the displacement pump (1) is formed by a vane pump.

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