EP1323926A2 - Pump - Google Patents

Abstract

The pump has a conveying unit (1) located in a housing (2) as well as an inlet channel (13) formed in the housing which extends into the suction region of the conveying unit. An injector unit (14) injects the fluid under pressure into a flow chamber (15). The inlet channel opens into another flow chamber (15) on both sides of the conveying unit via partial channels (16). The injector unit has at least one inlet nozzle (17) for the each chamber.

Description

The invention relates to a pump for conveying a fluid, in particular a vane pump, with a conveyor installed in a housing, a trained in the housing, in the suction area of the conveyor extending supply channel for the fluid and one for conveying the fluid serving injector device, the injector device under high pressure standing fluid into the from the supply channel in one of the conveyor upstream jet chamber injects fluid and this thereby sweeps along or accelerates.

Pumps of the type in question here, for example vane pumps, are well known from practice. The example is based on the DE 39 28 029 A1, DE 41 22 433 C2 and DE 41 38 516 A1.

Pumps of the generic type are used, for example, in power steering systems and promote a special oil to support the steering wheel of a Motor vehicle to be applied steering force. It is preferably These are vane pumps that are provided outside of the pump Draw in the reservoir, for example from an external tank, oil. Such Pumps are usually equipped with a flow control valve through which oil from the high pressure area - pressure side - into the suction area - suction side - the Pump can be directed. From a certain pump speed and at a flow rate, the flow control valve opens an outflow hole, through which oil under high pressure can escape. The oil gets into the Intake area of the conveyor.

There are always leaks on the pressure side of the pump, so special measures must be taken are required to drain the leak oil. These are in the state of the art Leakage paths already leading to the suction side are provided, so that the leak oil is again supplied to the tank oil fed into the pump. So far Measures implemented regarding leakage paths or leakage oil channels bring you considerable manufacturing effort and therefore do not represent one irrelevant cost factor in the manufacture of the pump.

From DE 41 38 516 A1 a generic pump is already known, which for Realization of an operation that is as free of cavitation as possible is a very special funding measure for conveying the tank oil, namely an injector device, which works like a water jet pump. The injector device is with under high pressure fluid applied, which the injector device from High pressure area is supplied here. This high pressure fluid injects the injector device into the fluid from the supply channel, and in the area of a blasting chamber upstream of the conveyor. Thereby the fluid coming out of the tank is entrained or accelerated and reaches it from there via another duct system into the intake area of the Conveyor.

The technology known from DE 41 38 516 A1 regarding the use of an injector device is problematic in so far as this injector device acts only on one side of the housing with a jet nozzle and from there the fluid coming from the tank on both sides of the housing - in the respective Suction area - must convey, namely, the fluid on both sides of the housing those assigned on both sides of the conveyor or the rotating group To provide sufficient suction kidneys. Due to the flow paths of different lengths to the suction kidneys arranged on both sides there occur different pressure conditions in the fluid, which in turn leads to a leads to different loading of the suction kidneys on both sides. Especially at high pump delivery rates lead to cavitation or cavitation based damage. There is also an even filling of both sides Questioning suction areas.

The present invention has for its object a pump of the generic type Type in such a way that further safe evacuation of the leakage oil on the pressure side while reducing the design or production engineering measures is possible. Furthermore, a uniform charging of the cells of the conveyor is ensured. damage due to cavitation should be effectively avoided.

The pump according to the invention solves the aforementioned task by Features of claim 1. Then a pump is the beginning mentioned type characterized in that the feed channel on both sides of the Conveying device with a subchannel opens into a blasting chamber and that the injector device emits on both sides, so that in each of the two blasting chambers at least one jet nozzle of the injector device is directed.

According to the invention it has been recognized that in both sides of the housing respective suction area of the conveyor, i.e. immediately before the Suction kidneys of the conveyor, the same amount of fluid under the same conditions Should provide. Furthermore, it has been recognized that such It is only possible to provide the fluid if the supply channel to the Supply of the fluid coming from the tank is actually on both sides of the Conveyor device with a subchannel opens, in one to Acceleration of the fluid-serving blasting chamber. The acceleration of there escaping fluids - on both sides of the housing - in a conventional manner using an injector device that is unlike the previous one prior art discussed bilaterally, i.e. on both sides of the housing, with each blasting into the respective blasting chamber. This is in each of the directed a jet nozzle of the injector device in both blasting chambers, so that due to the radiation of the high pressure fluid from the tank coming fluid is accelerated or entrained.

Advantageously, the injector device or its inlet is essentially arranged centrally above the conveyor. Such a central arrangement of the Injector device has the advantage that those extending on both sides of the conveyor device Paths on the one hand to accelerate the coming from the tank Fluids and on the other hand of the high pressure and for injection serving fluids are approximately the same length. Accordingly, it is in the Fluid reaching on both sides of suction areas of the conveying devices same pressure, so that an even loading of the Funding facility can take place.

In concrete terms and in the context of a particularly advantageous embodiment, the Jet nozzles aligned in such a way that the jet nozzle is under high pressure injected fluid onto the fluid to be accelerated in its flow direction or at an acute angle to its direction of flow. This will again favors the acceleration of the fluid coming from the tank, whereby the fluid under high pressure is already inside the injector device both jet nozzles is divided, namely with high kinetic energy of the Injection fluid.

With regard to the jet nozzles, it is advantageous if they have an approximately round nozzle shape have, so that the fluid exits a kind of jet jacket or forms a cylindrical / conical beam jacket. Compared to a thin one fine beam creates a larger contact surface, which is due to the there is double radiation on both sides by means of the jet nozzles. Ultimately, the fluid reaches the drain holes on both sides Jet nozzles of the injector device.

Furthermore, it is essential that the fluid conducting the fluid coming from the tank Subchannels of the feed channel divided into both sides of the conveyor device in are of approximately the same length, so that the distances are the same on the part of the fluid coming from the tank. After leaving The oil coming from the tank is submerged in the subchannels by the injected oil high pressure and high kinetic energy and while doing so accelerated, namely similar to the case with a water jet pump.

The partial channels of the feed channel divided on both sides of the conveyor are advantageously not only approximately the same length, but have also preferably the same course, this course possibly on both Pages is mirrored.

The generic pump has one on one side of the housing front housing cover and one on the other side of the housing Bearing flange, if this is necessary. In this respect it is possible that the be blasting chamber formed on the side of the conveyor at least largely is incorporated in the housing cover or in the bearing flange. It is the same conceivable that the blasting chamber is assigned to the actual housing and through the inner wall on the one hand of the housing cover and on the other hand the Bearing flange is limited. Both variants can be implemented.

As already mentioned before, the fluid coming from the tank is in accordance with the invention Way divided on both sides of the conveyor, being on this on both sides of the conveyor in the respective blasting chamber Acceleration of the fluid takes place through injection. In a particularly advantageous way The jet nozzles are arranged under a preferably acute angle or inclined downward to the exit of the Supply channel opposite wall of the housing and / or Bearing flange directed so that the accelerated fluid there with high energy bounces and according to the contour of the wall of the housing and / or Bearing flange evades on both sides. So there is another one here Distribution of the fluid instead, namely on both sides of the conveyor again two separate flow paths, on both sides of the in the housing provided central bore for the conveyor or for the Rotary group forming conveyor.

The wall of the housing and possibly the bearing flange is advantageous formed such that they pass through the accelerated fluid impinging there lateral outflow divided approximately evenly and in the sense of a control device at least largely in suction channels formed on both sides, the Lead suction channels into the immediate suction area of the conveyor. in the Specifically, the suction channels lead directly to the suction kidneys Conveyor, on both sides of the conveyor on two from each other separate flow paths so that the suction kidneys of the conveyor to four mutually independent locations with fluid under the same pressure and be supplied with the same volume of fluid. Even loading of the This ensures conveyor.

Furthermore, it is of particular advantage if the to the suction kidneys leading suction channels are at least largely of the same length in order namely to avoid different sized pressure drops in the fluid.

In a further advantageous manner, a pressure-limiting pilot is provided, which as Overload protection to limit a maximum operating pressure on the High pressure side serves. To do this, the pressure pilot is viewed from the high pressure side Fluid supplied, which again after passing through the pressure relief pilot is to be returned. For this purpose, the supply channel with the Pressure limiting pilots for returning the pilot oil. This Flow connection can preferably via a in the housing and / or in the Housing cover and / or channel labyrinth cast into the bearing flange be realized. In any case, it is advantageous if this fluid together with the fluid coming from the tank is returned to the circuit, namely immediately before the area of action of the injector device. It is the same possible, the fluid coming from the tank into the feed channel leak oil to supply which occurs unavoidably on the high pressure side. There are also drainage oil channels or a corresponding channel maze provided, which is of different Collection points from which the leak oil leads into the supply channel.

The leakage path could also be parallel to at least some areas Form the seal running, taking the leakage path near the Seal relieves pressure on the seal. Consequently, by taking precautions Leakage path not only achieves safe drainage of the fluid or leak oil, but at the same time a relief of the seal, which causes the sealing effect is favored in the long term. The leakage path is provided wherever leakage oil to be discharged on the pressure side occurs. As a result, the leakage path extends at least partially parallel to the seal, on the Inside of the seal or on the media side of the seal.

From a manufacturing point of view, it is of particular advantage if the already provided groove for the seal serves as a leakage path. This The groove is either in the housing cover or - if available - in the bearing flange or formed in the respective end face of the housing and actually serves for inserting or receiving the seal. The groove can, for example, in the respective Component be cast.

To use this groove as a leakage path, the groove is at least partially wider than that Formed seal, namely to the inside of the seal or media side, see above that the groove on the inside of the seal - media side - is parallel to the seal running leakage path forms, directly to the seal adjacent.

As part of such a constructive measure, the seal becomes immediate relieved on the inside of the seal and at the same time - on the Inside of the seal - lubricated and cooled if necessary. With a broad configuration of the Groove has a double function, namely the mounting of the seal and on the other hand the provision of a leakage path or leakage channel. Since the Groove to accommodate the seal is necessary anyway, the manufacturing effort significantly reduced. This measure also reduces the overall required space, so that this measure miniaturization of Pump is favored.

In a particularly advantageous manner, the groove is in the form of a closed, circumferential one Ring groove formed so that a sealing ring comes into question as a seal. How previously mentioned, the groove can be widened over its entire length so that the leakage path extends over the entire length of the seal the inside of the seal or media side - extends. It is the same conceivable that the leakage path - as widening of the groove - is only partial extends over the length of the groove, namely wherever there is something to be removed Leakage oil occurs.

In concrete terms, the groove could be a simple groove with a significantly widened groove base be made (at least wider than the usual groove for receiving the seal), so that the seal or the sealing ring in the outer area of the groove on the outer groove wall can be positioned adjacent. This results inevitably from the dimensioning of the groove on the one hand and the sealing ring on the other.

It is also conceivable that the groove is stepped towards the bottom of the groove, the Seal is arranged in the outer step of the groove. The one receiving the seal outer groove area is advantageously formed deeper. Of Furthermore, the groove can be designed as a type of double groove, namely with one extending between the groove areas, the groove areas from each other at least partially or largely separating web. In the outer groove area would be in accordance with the above statements insert the seal or the sealing ring, this groove area also in advantageously at least slightly larger than the seal. The inner groove area serves as a leakage path.

In a further advantageous manner, the widened region of the groove is parallel to the Leakage leakage path - at least at one point with the suction side the pump is connected to the flow, namely that which accumulates in the leakage path To pump leakage oil effectively from the pressure side. It will Leakage oil is fed directly to the suction side of the pump and is there again mixed with the tank oil. According to the amount of leakage oil it is of course also possible, several flow connections between the Leakage path and the suction side, which are holes, Recesses or even a kind of labyrinth, which differs from the Groove extends to the suction side. In any case, it must be ensured here that the leakage oil accumulating in the leakage path or in the groove is sufficient for Suction side is discharged.

In connection with the measures discussed above, it is advantageous if the entire printed page, i.e. the high pressure in the pump, at least predominantly within the housing interior and / or is sealed immediately adjacent to this. As part of such Measure will be the high pressure within the for the rotation group of the Vane pump trained bore sealed so that outside of this Hole or far away from this hole and thus away from the There is no "real" high pressure inside the housing. Hence the seal inside the extended groove no longer - like this in conventional pumps of the generic type is the case - the "real" Exposed to high pressure, so that the precaution of the leakage path with the leakage path itself on the one hand and with the one there on the other adjacent seal is favored.

The other seals used to seal the pressure side act opposite the housing cover and, if applicable, opposite the bearing flange. Here, too, it can be conventional sealing rings, by the way also with a special leakage path - as an extended groove - can be equipped. Ultimately, it is conceivable to insert several at once to design grooves serving as seals each as a special leakage path, namely, with regard to the leakage oil, a particularly effective discharge to be able to guarantee.

Fig. 1 in einer schematischen Seitenansicht, geschnitten, ein Ausführungsbeispiel einer gattungsgemäßen Pumpe,

Fig. 2 in einer schematischen Seitenansicht, geschnitten, den Gegenstand aus Fig. 1 ohne Gehäusedeckel, ohne Lagerflansch und ohne Fördereinrichtung,

Fig. 3 den Gegenstand aus Fig. 2 in einer Stirnansicht bei abgenommenem Gehäusedeckel, wobei dort der Austritt des Zufuhrkanals und der Injektoreinrichtung in die Strahlkammer sichtbar ist und

Fig. 4 in einer schematischen Innenansicht den Lagerflansch, auf dessen Wandung das beschleunigte Fluid auftrifft,

Fig. 5 in einer schematischen Seitenansicht, geschnitten, ein weiteres Ausführungsbeispiel einer gattungsgemäßen Pumpe,

Fig. 6 den Gegenstand aus Fig. 5 in einer Stirnansicht bei abgenommenem Gehäusedeckel, wobei dort die den Leckagepfad bildende Nut in die Stirnseite des Pumpengehäuses eingearbeitet ist,

Fig. 7 in einer schematischen Innenansicht den Lagerflansch mit eingearbeiteter Nut, jedoch ohne Dichtung,

Fig. 8 in drei schematisch untereinander angeordneten Abbildungen drei verschiedene Ausführungsformen der den Leckagepfad umfassenden Nut.

There are various possibilities for advantageously designing and developing the teaching of the present invention. For this purpose, on the one hand, reference is made to the claims subordinate to patent claims 1 and 14, and on the other hand to the following explanation of exemplary embodiments of the invention with reference to the drawing. In connection with the explanation of the preferred exemplary embodiments of the invention with reference to the drawing, generally preferred refinements and developments of the teaching are also explained. In the drawing shows

1 is a schematic side view, sectioned, an embodiment of a generic pump,

2 in a schematic side view, sectioned, the object from FIG. 1 without a housing cover, without a bearing flange and without a conveyor,

3 shows the object from FIG. 2 in a front view with the housing cover removed, the exit of the feed channel and the injector device into the blasting chamber being visible there

4 is a schematic interior view of the bearing flange, on the wall of which the accelerated fluid strikes,

5 in a schematic side view, in section, a further exemplary embodiment of a generic pump,

6 shows the object from FIG. 5 in a front view with the housing cover removed, the groove forming the leakage path being worked into the front side of the pump housing there,

7 is a schematic interior view of the bearing flange with an incorporated groove, but without a seal,

8 shows three different embodiments of the groove comprising the leakage path in three schematically arranged illustrations.

1 and 2 clearly show that in the suction area, i.e. to Suction side 112 out, a supply channel 113 extends for the fluid. Furthermore is an injector device 114 is used to convey the fluid, which works like a water jet pump. This injector device 114 injects fluid under high pressure in one of the conveyors 1 upstream Blasting chamber 115, and there into the fluid emerging from the feed channel 113 and thereby accelerates the fluid or thereby entrains the fluid.

The feed channel 113 opens on both sides of the conveyor 1 with one each Subchannel 116 into a - separate - blasting chamber 115, the injector device 114 emits on both sides, so that one in each of the two blasting chambers 115 Jet nozzle 117 of the injector 114 is directed.

1 and 2 together show that the injector device 114 is centrally located the conveyor 1 is arranged. The jet nozzles 117 are of this type aligned that the injected via the jet nozzle 117 under high pressure Fluid strikes the fluid to be accelerated roughly in its direction of flow, so that the fluid coming from the tank accelerates again is favored. The fluid passes through the supply channel 113, the valve bore 125 and the outflow bores 126 to the two jet nozzles 117.

1 and 2 further show that the sub-channels 116 of the on both sides of the feed device 1 divided supply channel 113 are approximately the same length, since namely the supply channel 113 also approximately in the middle above the Distributes conveyor 1 evenly.

FIG. 1 shows that the conveyor 1 formed on both sides Blasting chamber 115 largely in the housing cover 3 on one side and in the bearing flange 4 is incorporated on the other side. The jet nozzles 117 are orthogonal to the one opposite the outlet of the feed channel 113 Turn 118 of the housing cover 3 on one side and on the exit wall 119 of the bearing flange 4 opposite the feed channel 113 directed.

According to the illustration in FIG. 4, the wall 119 of the bearing flange 4 is such trained that the accelerated fluid hitting there through lateral Outflow divided approximately evenly. The flow path of the fluid is with the Reference numeral 120 marked. Ultimately, the walls 119, 120 conduct the fluid in the sense of a guide device in suction channels 121 formed on both sides, so that the fluid is divided again. The suction channels 121 lead to suction kidneys, not shown in the figures, of the conveyor 1, wherein these are arranged downstream of the direct suction area 122 of the conveyor device 1 are.

Fig. 4 further clearly shows that the suction kidneys or the Suction area 122 leading suction channels 121 formed approximately the same length are so that the same pressure conditions prevail on both sides in the suction area 122 and an equal volume of fluid is provided. foregoing Of course, explanations also apply to the situation on the part of the Housing cover 3, wherein FIG. 3 shows the housing 2 only in an end view opposite the housing cover shows, where there are the mouths of the feed channel 113 or the subchannel 116 and the injector device 114 or the jet nozzle 117 are shown. On a separate representation of the wall 118 of the Housing cover 3 corresponding to the representation of the bearing flange 4 in FIG. 8 is omitted for the sake of simplicity.

FIG. 3 further shows that the feed channel 113 does not have one in FIG. 3 shown pressure relief pilot for returning pilot oil is connected to the flow, namely via a special pilot oil channel 123. Des Furthermore, a leak oil channel 124 opens into the supply channel 113, so that returned pilot oil and leak oil within the supply channel 113 with that from the tank Mix incoming fluid. The total amount of fluid generated there will be then after leaving the feed channel 113 or the sub-channel 116 via the Injector device 114 or via the outflow bores 126 and via the Jet nozzles 117 acted upon by high-pressure fluid and thereby accelerated.

Fig. 5 shows a simplified representation of a generic pump in one sectional side view, here specifically a vane pump with a rotation group 1 or conveyor not described here is. With regard to the special design of such a rotating group 1 is only referred to DE 39 28 029 A1 as an example.

The pump shown here comprises - as essential components - a housing 2 and a conveyor device accommodated in the housing 2, wherein it is this is the rotation group 1 already mentioned. Is on the front one side a housing cover 3 and the housing cover 2 other side - on the side opposite the housing cover 3 provided on the housing 2 adjacent bearing flange 4.

Between the housing 2 and the housing cover 3 on the one hand and between the Housing 2 and the bearing flange 4, on the other hand, is an external one Seal 5, 6 arranged, the one acting against the housing cover 3 Seal 5 inserted into a groove 8 formed in the end face 7 of the housing 2 is. On the other side of the housing 2, the seal 6 is the Bearing flange 4 assigned or into a groove 9 machined into the bearing flange 4 used. The groove 9 could also be in the end face 10 of the housing 2 be incorporated.

It is already known from the prior art between the pressure side 11 and to provide a leakage path for the fluid on the suction side 12 of the pump, namely a leakage path for those that occur on the pressure side and are to be conveyed to the suction side Leak oil.

According to the invention, the leakage path 13 is on the inside of the seal. Media side - at least partially formed parallel to the seal 5, 6.

6 shows particularly clearly that the groove 8 is used to form the leakage path 13 is wider than the seal 5, so that on the inside of the seal 14 The leakage path 13 is formed parallel to the seal 5. The leakage path is also 13 formed by the groove 9 in the bearing flange 4, wherein in the illustration of the bearing flange 4 according to FIG. 7 on the separate representation of the seal 6 was waived.

Figures 5 to 8 together show that the grooves 8, 9 as in themselves closed ring grooves are formed. The seals 5, 6 are correspondingly designed as sealing rings, the leakage path 13 only over those Areas of the grooves 8, 9 extends where leak oil occurs and accordingly to be transported away or to be removed. Only there is the leakage path 13 as integral part of the groove 8, 9 executed, this with regard to the Housing cover 3 formed groove 8 shown particularly clearly in Fig. 6 is

FIG. 6 furthermore indicates that the one that forms the leakage path 13 widened area of the groove 8 with the suction side 12 of the pump is connected to the flow, namely via an integral leak oil channel 15 further indicated how the leak oil 16 in the leakage path 13 - parallel to seal 5 - i.e. in the groove 8, and how the leak oil 16 from there the leak oil channel 15 of the suction side 12 and thus the tank oil is supplied.

Furthermore, it is indicated in Fig. 5 that the printing side 11, i.e. the high pressure, at least predominantly within the housing interior 17 or is sealed immediately adjacent to this. To do this are opposite Housing cover 3 and seals 18, 19 acting against the bearing flange 4 20, 21 provided, which are also sealing rings and / or Combination seals. Consequently, the first mentioned seals 5, 6 in substantially a lower pressure near the suction pressure or the Tank pressure exposed, making the pump's overall sealing effect quite substantial favored.

Fig. 8 shows three specific configurations of the groove, which are both the groove 8 formed in the end face 7 of the housing 2 and also around that in the bearing flange 4 trained groove 9 can act.

Fig. 8 shows in the upper representation that the groove 8 or 9 to form the leakage path 13 is designed to be substantially wider than that for receiving the seal 5 or 6 is required. This wider configuration makes the leakage path 13 immediately next to the seal 5 or 6, each on the Pressure inside.

The embodiment shown below in FIG. 8 - in the middle - shows one step configuration of the groove 8 or 9, the seal 5 or 6 in deeper groove area is arranged. The leakage path 13 lies on something higher level than the 5 or 6 receiving groove bottom of the deeper groove area.

The bottom illustration in Fig. 8 shows a two-part groove 8 or 9, being in the frame this exemplary embodiment, the leakage path 13 through a web 22 of the area of the groove 8 or 9 receiving the seal 5 or 6 is separated, the web 22 is lower than the outer wall 23 of the groove 8 or 9 or Leakage path 13 is executed so that with a sufficient amount of leakage oil this can go directly to the seal 5 or 6.

Finally, it should be emphasized that the above is only an example Embodiment only explains the teaching of the invention, however not limited to the embodiment.

Claims (10)

Pump for conveying a fluid, in particular a vane pump, with a conveying device (1) accommodated in a housing (2), with a feed channel (113) for the conveying device (1) formed in the housing (2) and extending into the suction area (122) of the conveying device (1) Fluid and an injector device (114) serving to convey the fluid, the injector device (114) injecting fluid under high pressure into the fluid emerging from the feed channel (113) into a blasting chamber (115) upstream of the delivery device (1) and thereby injecting it sweeps along or accelerates,
characterized in that the feed channel (113) opens into a blasting chamber (115) on each side of the conveying device (1), each with a sub-channel (116), and in that the injector device (114) emits on both sides, so that at least in each of the two blasting chambers (115) a jet nozzle (117) of the injector device (114) is directed. Pump according to claim 1, characterized in that the injector device (114) or its inlet is arranged substantially centrally above the delivery device (1). Pump according to claim 1 or 2, characterized in that the jet nozzles (117) are aligned in such a way that the fluid injected via the jet nozzle (117) under high pressure strikes the fluid to be accelerated in its direction of flow or at an acute angle to its direction of flow , Pump according to one of claims 1 to 3, characterized in that the sub-channels (116) of the feed channel (113) divided on both sides of the conveying device (1) are of approximately the same length. Pump according to one of claims 1 to 4, characterized in that the subchannels (116) of the feed channel (113) divided on both sides of the conveying device (1) preferably have approximately the same course, mirror-inverted. Pump according to one of claims 1 to 5, wherein the housing is closed on one side by an end housing cover (3) and on the other side optionally by a bearing flange (4), characterized in that the conveyor device (1) is formed on both sides Blasting chamber (115) is at least largely incorporated into the housing cover (3) and possibly into the bearing flange (4). Pump according to claim 6, characterized in that the jet nozzles (117) are inclined, preferably inclined downwards, towards the wall (118) of the housing cover (3) and / or the bearing flange (4) opposite the outlet of the supply channel (113) , wherein the wall (118) is preferably rounded. Pump according to claim 1 or 7, characterized in that the wall (118, 119) of the housing cover (3) and possibly the bearing flange (4) is designed such that it approximately evenly distributes the accelerated fluid impinging there by lateral outflow and in the sense of a guide device, at least largely guides into suction channels (121) formed on both sides. Pump according to claim 8, characterized in that the suction channels (121) lead to suction kidneys of the conveying device (1) and that the suction channels (121) leading to the suction kidneys can be at least largely of the same length. Pump according to one of claims 1 to 9, characterized in that the supply channel (113) is fluidly connected to a pressure limiting pilot for returning pilot oil, the flow connection being preferably via a housing (2) and / or housing cover (3) and / or channel labyrinth cast into the bearing flange (4) can be realized.

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