Delivery device for delivering a liquid

Abstract

The invention relates to a delivery device (1) for delivering a liquid, in particular a coolant, comprising a housing (2) and a shaft (3) which is rotatably mounted about an axial rotation axis (100) by means of a bearing (3) arranged in the housing (2) and is non-rotatably connected to a delivery mechanism (4). The service life of the delivery device (1) is extended by radially expanding a hollow space (5) in the housing (2). Furthermore, the invention relates to a motor vehicle (50) having the delivery device (1).

Description

TECHNICAL FIELD

[0001] The invention relates to a delivery device for delivering a liquid, in particular a coolant. The invention also relates to a motor vehicle having such a delivery device. BACKGROUND

[0002] Delivery devices for delivering a liquid generally comprise a delivery mechanism for delivering the liquid. Typically, the delivery mechanism is non-rotatably connected to a shaft which rotates during operation, thereby driving the delivery mechanism. The shaft is mounted in a rotatable manner by means of a bearing arranged in a housing of the delivery device. Generally, a shaft seal is arranged between the delivery mechanism and the shaft in order to prevent the liquid from entering the bearing.

[0003] Such delivery devices are known, for example, from DE 10 2010 043 264 A1, DE 43 181 58 A1, DE 10 2015 117 126 A1, JP 2020 197 156 A, JP H07 31 05 48 A and US 10,240,617 B2. SUMMARY

[0004] It is an object of the present invention to propose an improved or at least alternative embodiment of a delivery device of the type mentioned in the opening paragraph and of a motor vehicle having such a delivery device, which in particular eliminates the drawbacks of the prior art. In particular, it is an object of the present invention to propose an improved or at least alternative embodiment which is characterized by an increased service life of the delivery device.

[0005] The invention is therefore based on the general idea of radially expanding a hollow space which is formed between a bearing and a shaft seal of the delivery device. Liquid which enters the hollow space during operation, in particular due to a leak, can thereby be stored in a greater amount / volume before the liquid flows out of the hollow space. This results in no or at least a reduced risk of the liquid reaching the bearing. Damage caused by a bearing aging process due to contact of the liquid or liquid vapor with the bearing can thereby be prevented or at least reduced, so that the service life of the delivery device is increased. Here, the knowledge that the service life of the delivery device is essentially or at least to a greater extent dependent on the service life of the bearing is utilized, so that a reduction of the damage and the aging process of the bearing results in a corresponding increase of the service life of the delivery device. Furthermore, the knowledge that, despite the shaft seal, liquid can enter the hollow space due to operation, vibrations, accelerations and movements of particles contained in the liquid is utilized, so that the expanded hollow space also protects the bearing from the liquid in this case better, in this way also extending the service life of the delivery device.

[0006] According to the idea of the present application, the delivery device comprises a housing in which a shaft is arranged. A bearing is arranged in the housing and rotatably mounts the shaft about an axial rotation axis. During operation, the shaft thus rotates about the rotation axis and is non-rotatably connected to the delivery device arranged outside the housing, so that the delivery device delivers a liquid during operation. A shaft seal is arranged axially between the bearing and the delivery mechanism and radially outside the shaft and serves to seal the hollow space against the ingress of liquid into the hollow space. A hollow space is formed axially between the bearing and the shaft seal. Furthermore, the delivery device comprises a collection space which is arranged on the side of the hollow space radially away from the shaft. The collection space is fluidically connected to the hollow space by an opening. This radially expands the hollow space axially between the bearing and the shaft seal.

[0007] The directions described here refer to the rotation axis of the axially extending shaft. Thus, "axially" extends parallel to the rotation axis, in particular coaxially to the rotation axis. Furthermore, "radially" extends transversely to the rotation axis. Furthermore, the circumferential direction extends about the rotation axis.

[0008] The hollow space thus radially expands outwardly along the rotation axis and thus axially. Preferably, the hollow space expands radially outwardly at least partially, preferably completely, continuously.

[0009] The radial expansion of the hollow space must be understood in particular in comparison with the cylindrical hollow space known from the prior art.

[0010] The collection space, which is separated from the hollow space, serves to collect liquid which enters the hollow space. Thus, the liquid flows into the collection space through the opening. In the following, this opening is also referred to as a discharge opening.

[0011] The discharge opening actually opens into the hollow space and the collection space.

[0012] In general, the collection space can be arranged / formed outside the housing.

[0013] Advantageously, the collection space is formed in the housing. This leads to a simplified and compact design of the delivery device.

[0014] The delivery device can be used to deliver any liquid.

[0015] In particular, the delivery device is used to deliver a liquid coolant in the relevant application. During operation of the relevant application, the delivery device delivers the liquid along a flow path. Since contact of the coolant with the bearing can significantly impair / age the bearing, the delivery device according to the application achieves an advantageous protection of the bearing in the case of a coolant as the liquid.

[0016] The delivery device can be used, for example, in a motor vehicle.

[0017] In particular, the conveying device can be comprised in a circuit through which the liquid is circulated during operation, wherein the conveying device conveys the liquid through the circuit during operation and thereby along the flow path.

[0018] In a related application, in particular in a motor vehicle, the circuit can be used for temperature control, i.e. cooling and / or heating.

[0019] It is particularly conceivable to use the circuit as an air conditioner for the interior, in particular for the interior of a motor vehicle, thereby as part of an air conditioning system.

[0020] In order to axially position the bearing in the housing, the conveying device, in particular the housing, can comprise a radially inwardly protruding protrusion. The protrusion can thus radially enter the hollow space.

[0021] Generally, the bearing can be axially positioned since the bearing axially abuts against the protrusion.

[0022] In a preferred embodiment, a seal for sealing the bearing with respect to the hollow space is arranged axially between the bearing and the protrusion, which is also referred to as bearing seal in the following. This leads to a further improvement of the protection of the bearing and thus to a further prolongation of the service life.

[0023] Advantageously, the bearing seal is arranged radially outside the shaft. Preferably, the bearing seal slides on the shaft during operation. Thus, the sealing of the bearing with respect to the hollow space is improved.

[0024] Advantageously, the bearing seal is arranged axially between the protrusion and the bearing. In particular, the bearing seal can be axially positioned in the housing by means of the protrusion. It is particularly conceivable that the bearing seal is axially loaded mechanically by the bearing and / or the protrusion.

[0025] Generally, the conveying mechanism can be any configuration as long as the non-rotatable connection of the conveying mechanism with the shaft leads to the conveying of the liquid during operation. It is to be understood that the non-rotatable connection can be breakable, for example by means of a clutch, so that the conveying mechanism is driven only by the shaft, for example when required and / or only in the direction of rotation of the shaft.

[0026] In particular, the conveying mechanism is a pump mechanism. The conveying device is thus designed in particular as a pump. It is conceivable that the conveying mechanism comprises an impeller which is connected to the shaft in a non-rotatable manner.

[0027] Advantageously, the shaft protrudes axially outside the housing through an axial opening hole of the housing and is non-rotatably connected to the conveying mechanism. In the following, the hole is also referred to as shaft hole. Preferably, a shaft seal is arranged in the shaft hole. This leads to an improved sealing of the hollow space against the entry of liquid.

[0028] Basically, the shaft seal can be of any design.

[0029] Advantageously, the shaft seal is formed as a sliding ring seal. This leads to an improved sealing of the hollow space. Preferably, the shaft seal slides on the shaft during operation. Thus, an even further improved sealing of the hollow space is achieved.

[0030] In a preferred embodiment, the discharge opening in the context of the present application is arranged at a radially lowest point of the hollow space. Thus, in particular due to gravity, liquid can reliably and more easily flow into the collection space through the discharge opening. When using the conveying device in a motor vehicle, the discharge opening is thus arranged at a lowest point of the hollow space in the Z direction of the motor vehicle or in a vertical direction.

[0031] Preferably, the conveying device comprises a further opening spaced apart from the discharge opening in the circumferential direction for discharging gas and vapor from the hollow space, which is in fluid communication to the environment. Thus, the further opening is in particular used for ventilating the hollow space. In addition, the further opening is used for discharging evaporated liquid, i.e. liquid vapor, from the hollow space. In the following, the further opening is also referred to as ventilation opening. This leads to the fact that liquid also flows out of the hollow space in the form of vapor, thereby further improving the protection of the bearing and further prolonging the service life of the conveying device.

[0032] Advantageously, the ventilation opening is located in a radially upper region of the hollow space. Thus, gas and / or vapor can more easily flow out of the hollow space through the ventilation opening.

[0033] In a preferred embodiment, the ventilation opening is arranged at a radially highest point of the hollow space. In particular, the ventilation opening is arranged radially opposite to the discharge opening. This leads to an improved outflow of gas and / or vapor from the hollow space through the ventilation opening. When using the conveying device on a motor vehicle, the ventilation opening is arranged at a highest point of the hollow space in the Z direction of the motor vehicle or in a vertical direction.

[0034] Basically, the discharge opening and / or the ventilation opening can be of any design. In particular, the discharge opening and / or the ventilation opening can be formed as an orifice. Preferred herein is that the discharge opening and / or the ventilation opening extends radially.

[0035] Advantageously, the discharge opening comprises a flowable cross section of at least 6 mm, preferably at least 7 mm. Thus, when deposits are formed in the discharge opening with increasing service life, liquid can also reliably flow into the collection space.

[0036] Advantageously, the ventilation opening comprises a flowable cross section of at least 6 mm, preferably at least 7 mm. Thus, when deposits are formed in the ventilation opening with increasing service life, gas and liquid vapor can reliably flow out of the hollow space.

[0037] In a preferred embodiment, the hollow space expands radially towards the shaft seal in the axial direction. Thus, the liquid flows towards the shaft seal and thus away from the bearing. This increases the protection of the bearing, which further increases the service life of the bearing.

[0038] In a preferred embodiment, the hollow space expands radially towards the discharge opening. Thus, the liquid in the hollow space can flow better towards the discharge opening and thus better out of the hollow space. The result is better protection of the bearing, which increases the service life of the bearing.

[0039] In a preferred embodiment, the hollow space expands radially up to the discharge opening. Thus, the discharge opening is arranged at the radially lowest point of the hollow space, wherein the expansion of the hollow space at the same time causes the liquid to flow towards the discharge opening. Thus, the liquid can flow better and easier out of the hollow space. Thus, the bearing is better protected and the service life of the bearing is also increased.

[0040] Embodiments in which the hollow space expands radially from the protrusion up to the discharge opening are considered advantageous. Thus, the available space between the bearing and the discharge opening is essentially used for expanding the hollow space. Thus, the hollow space is further expanded, so that the hollow space can store more liquid. Thus, the bearing is better protected and the service life of the bearing is increased.

[0041] In an advantageous embodiment, the hollow space expands radially in the direction towards the vent. Thus, a further expansion of the hollow space is achieved, wherein the gas and / or the vapor at the same time can flow better along the hollow space in the direction towards the vent, so that it flows out of the hollow space. The result is better protection of the bearing, which increases the service life.

[0042] In a preferred embodiment, the hollow space expands radially up to the vent. Thus, the vent forms the radially outermost point, particularly preferably the radially highest point of the hollow space. Thus, not only the hollow space is expanded, but also the outflow of the gas and / or the vapor from the hollow space through the vent is improved. The result is better protection of the bearing, which increases the service life of the bearing.

[0043] Since the hollow space expands radially from the protrusion up to the vent, an advantageous variant is obtained. Thus, the available space between the bearing and the vent is essentially used for radially expanding the hollow space. Thus, a further expansion of the hollow space is achieved, so that the hollow space can store more liquid and / or gas or vapor. Thus, the bearing is better protected, which increases the service life of the bearing.

[0044] Basically, the hollow space can expand radially differently towards the discharge opening and towards the vent.

[0045] Advantageously, the hollow space expands radially equally towards the discharge opening and towards the ventilation opening. Thus, a simplified production of the conveying device is achieved. Preferably, the hollow space is formed symmetrically with respect to a plane containing the axis of rotation. This plane extends axially and radially, preferably in the circumferential direction between the discharge opening and the ventilation opening. Thus, the hollow space is advantageously formed in the shape of a bathtub. In this way, in addition to expanding the volume of the hollow space, a simplified production of the conveying device is achieved.

[0046] With respect to the rotation about the axis of rotation, the hollow space can be formed substantially asymmetrically or N-fold symmetrically, wherein N is a natural number greater than or equal to 1. Advantageously, the discharge opening and / or the ventilation opening are not included, which are preferably formed locally in the circumferential direction.

[0047] Preferably, the hollow space is formed completely rotationally symmetrically. Thus, the hollow space can be shaped in the manner of a straight cone. Thus, a further expansion of the hollow space is achieved, so that the hollow space can store more liquid and / or gas or vapor. Thus, an improved protection of the bearing is achieved, so that an increased service life of the bearing is achieved.

[0048] It is to be understood that, in addition to the conveying device, a motor vehicle having such a conveying device is also part of the scope of the present application.

[0049] Further important features and advantages of the present application can be gathered from the drawings and from the related graphic description by means of the drawings.

[0050] It is to be understood that the features mentioned above and those yet to be explained below can be used not only in the respective combinations indicated, but also in other combinations or alone without departing from the scope of the present application.

[0051] Preferred exemplary embodiments of the present application are shown in the drawings and explained in more detail in the following description, in which the same reference signs refer to identical or similar or functionally identical parts. BRIEF DESCRIPTION OF DRAWINGS

[0052] are respectively shown schematically:

[0053] Figure 1 is a sectional view of the conveying device,

[0054] Figure 2 is Figure 1 is an enlarged view of the portion designated II in the middle,

[0055] Figure 3 is a highly simplified representation in the form of a circuit diagram of a motor vehicle having the conveying device. DETAILED DESCRIPTION

[0056] As Figures 1 to 3The delivery device 1 is shown exemplarily for delivering a liquid, in particular for delivering a coolant. As Figure 3 The delivery device 1 is shown exemplarily for delivering a liquid, in particular for delivering a coolant. As

[0057] Figure 1 An axial sectional view of the delivery device 1 is shown, Figure 2 Figure 1 An enlarged view of the portion designated as II.

[0058] From Figure 1 Figure 2 It is apparent that the delivery device 1 comprises a housing 2. The shaft 3 rotates during operation about an axial rotation axis 100. For this purpose, the shaft 3 is driven in the exemplarily shown embodiment by an electric motor 19, which is arranged in the exemplarily shown embodiment in the housing 2. The shaft 3 is non-rotatably connected to a delivery mechanism 4 arranged outside the housing 2, so that the delivery mechanism 4 delivers a liquid during operation. In Figure 1 Figure 2 In the exemplarily shown embodiment, the delivery mechanism 4 is designed as an impeller 5. Furthermore, the shaft 3 axially protrudes through a bore 12 of the housing 2 (the bore 12 is also referred to in the following as shaft bore 12) and is non-rotatably connected to the delivery mechanism 4. In the housing 2, the delivery device 1 comprises a bearing 6, which rotatably mounts the shaft 3 about the rotation axis 100. A shaft seal 7 for sealing the housing 2 against the ingress of liquid is arranged axially between the bearing 6 and the delivery mechanism 4. In Figure 1 Figure 2 In the exemplarily shown embodiment, the shaft seal 7 is formed as a slide ring seal 8, which slides during operation on the shaft 3. Furthermore, the shaft seal 7 is arranged in the shaft bore 12. Between the bearing 6 and the shaft seal 7, a hollow space 9 is formed axially, through which the shaft 3 axially extends. On the side of the hollow space 9 radially facing away from the shaft 3, a further hollow space 10 is formed in the housing, which is also referred to in the following as collection space 10. The collection space 10 is fluidically connected to the hollow space 9 by means of an opening 11. During operation of the delivery device 1, liquid can still enter the collection space 10 despite the presence of the shaft seal 7, in particular due to the design of the shaft seal 7, due to movements, due to aging processes and due to particles in the liquid. This liquid can flow through the opening 11 into the collection space 10. In the following, the opening 11 is also referred to as drain 11. The drain 11 opens into the hollow space 9 and into the collection space 10 and is formed as a bore 13 extending radially in the exemplarily shown embodiment. From Figure 1 Figure 2 It is further apparent that the hollow space 9 extends axially between the bearing 6 and the shaft seal 7 and radially. ​​​​​

[0059] The directions described herein all refer to an axial rotation axis 100. Thus, "axial" extends parallel to the rotation axis 100, in particular coaxially to the rotation axis 100. Furthermore, "radial" extends transversely to the rotation axis 100. Furthermore, a circumferential direction 101 extends around the rotation axis 100.

[0060] The hollow space 9 axially between the bearing 6 and the shaft seal 7 and radially expanding thus expands radially outwardly along the rotation axis 100 and thus axially. In the exemplary embodiment shown and preferably, the expansion of the hollow space 9 is continuous. Thus, for example in comparison with a cylinder, the hollow space 9 has an expanding volume. The expansion of the volume of the hollow space 9 results in the liquid being able to be stored in the hollow space 9 in an increased amount for subsequent flow into the collection space 10 through the discharge opening 11. Thus, it is prevented that the liquid reaches the bearing 6 and damages the bearing 6 or at least the likelihood of such damage is reduced. Thus, the service life of the conveying device 1 is increased.

[0061] From Figure 1 and Figure 2 It can be clearly seen that in the exemplary embodiment shown, the conveying device 1 comprises an opening 15 spaced apart from the discharge opening 10 in the circumferential direction 101, which connects the hollow space 9 with the environment. As described above, the discharge opening 11 serves for the outflow of liquid from the hollow space 9 and thus for the discharge into the collection space 10. The discharge opening 11 in the hollow space 9 is arranged on a radially outermost point 14 of the hollow space 9. In the relevant application, i.e. for example in the motor vehicle 50, the point 14 forms a radially lowest point 14 of the hollow space 9. This means that along the Z direction 102 of the motor vehicle 50 or in the vertical direction 103, the radially outermost point 14 forms the lowest point 14 of the hollow space 9. Thus, the liquid can flow better from the hollow space 9 into the collection space 11. The opening 15 serves for the discharge of gas from the hollow space 9, for the ventilation and discharge of liquid vapor, which is also referred to as ventilation opening 15 hereinafter. In the exemplary embodiment shown, the ventilation opening 15 is arranged radially opposite the discharge opening 11 and likewise formed as a radially extending aperture 13. Thus, the ventilation opening 15 is arranged at a radially highest point 16 of the hollow space 9.

[0062] From Figure 1 and Figure 2 It can be clearly seen that in the exemplary embodiment shown, the hollow space 9 expands radially axially toward the shaft seal 7. This means that the hollow space 9 expands radially in the direction toward the shaft seal 7. Furthermore, the hollow space 9 expands radially toward the discharge opening 11. In the exemplary embodiment shown, the hollow space 9 also expands radially toward the ventilation opening 15. Thus, the hollow space 9 is further expanded, wherein liquid and gas, in particular liquid vapor, can flow out of the hollow space 9 more easily and better at the same time.

[0063] In the shown exemplary embodiment, the housing 2 comprises a radially inwardly protruding protrusion 17, which axially positions the bearing 6 in the housing 2. The protrusion 17 is arranged axially between the shaft seal 7 and the bearing 6 and extends circumferentially 101 closed. The hollow space 9 in the shown exemplary embodiment extends radially from the protrusion 17 to the discharge 11 and radially from the protrusion 17 to the vent 15. From Figure 1 and Figure 2 It is apparent that the hollow space 9 is formed symmetrically with respect to a plane containing the rotation axis 100 and protruding transversely to the drawing plane. Thus, Figure 1 and Figure 2 The hollow space 9 in the shown section has the shape of a bathtub. The hollow space 9 is preferably formed rotationally symmetrically with respect to the rotation axis 100 (not shown), i.e. is advantageously shaped in the manner of a right cone. Not including the discharge 11 and the vent 15, each of the above-mentioned components extends locally in the circumferential direction 101.

[0064] In particular, from Figure 1 It is apparent that the delivery device 1 shown in the exemplary embodiment comprises a seal 18, which is axially located between the bearing 6 and the shaft seal 7 and axially adjoins the bearing 6, seals the bearing 6 with respect to the hollow space 9 and is referred to as bearing seal 18 in the following. The bearing seal 18 is arranged axially between the protrusion 17 and the bearing 6 and axially positioned between the bearing 6 and the protrusion 17. The bearing seal 18 is arranged radially outside the shaft 3 and slides on the shaft 3 during operation. Thus, a better protection of the bearing 6 and thus an increase of the service life of the delivery device 1 is achieved.

[0065] According to Figure 2 , the motor vehicle 50 can comprise a circuit 52 for a liquid, the flow path 51 guiding the liquid through the circuit 52 such that the liquid is circulated through the circuit 52 during operation. The delivery device 1 is contained in the circuit 52 such that the delivery device 1 delivers the liquid through the circuit 52 during operation. In the shown exemplary embodiment, the liquid is a coolant such that the circuit 52 is a coolant circuit 52. In the shown exemplary embodiment, the circuit 52 comprises further components than the delivery device 1, for example: a condenser 53 for condensing the coolant arranged downstream of the delivery device 1, an expander 54 for expanding the coolant arranged downstream of the condenser 53, and an evaporator 55 for evaporating the coolant arranged downstream of the expander 54 and upstream of the delivery device 1. As Figure 2 Figure 3 Figure 3 indicated by the dashed arrows in the middle, an air flow 56 can flow through the evaporator 55 separately from the coolant flow and into an interior 57 of the motor vehicle 50 in order to cool the interior 57. The circuit 52 can thus be part of an air conditioning system 58.

Claims

1. A delivery device (1) for delivering a liquid, - having a housing (2) in which a shaft (3) is arranged, which shaft (3) rotates about an axial rotation axis (100) during operation, - wherein the shaft (3) is non-rotatably connected to a delivery mechanism (4) arranged outside the housing (2) such that the delivery mechanism (4) delivers a liquid during operation, - having a bearing (6) arranged in the housing (2), which bearing rotatably mounts the shaft (3) about the rotation axis (100), - having a shaft seal (7) axially arranged between the bearing (6) and the delivery mechanism (4) for sealing the housing (2) against the ingress of liquid, which shaft seal (7) is radially arranged outside the shaft (3), - having a hollow space (9) axially formed between the bearing (6) and the shaft seal (7), - having a collection space (10) radially arranged on the side of the hollow space (9) facing away from the shaft (3), which collection space (10) is fluidically connected to the hollow space (9) by a drain (11), - wherein the hollow space (9) axially between the bearing (6) and the shaft seal (7) expands radially, and - wherein the hollow space (9) axially and completely, continuously expands radially outwards.

2. The delivery device according to claim 1, characterized in that the hollow space (9) expands radially axially towards the shaft seal (7).

3. The delivery device according to claim 1 or 2, characterized in that the hollow space (9) expands radially towards the drain (11).

4. The delivery device according to claim 3, characterized in - that the delivery device (1) comprises a radially inwardly projecting protrusion (17), which protrusion (17) axially positions the bearing (6), - that the hollow space (9) expands radially from the protrusion (17) up to the drain (11).

5. The delivery device according to claim 1 or 2, characterized in that the drain (11) is arranged at a radially lowest point (14) of the hollow space (9).

6. The delivery device according to claim 1 or 2, characterized in - that a vent (15) spaced apart from the drain (11) in a circumferential direction (101) connects the hollow space (9) with the environment for venting, - that the hollow space (9) expands radially radially towards the vent (15).

7. The delivery device according to claim 6, characterized in - that the delivery device (1) comprises a radially inwardly projecting protrusion (17), which protrusion (17) axially positions the bearing (6), - that the hollow space (9) expands radially from the protrusion (17) up to the vent (15).

8. The delivery device according to claim 7, characterized in that the vent (15) is arranged at a radially highest point (16) of the hollow space (9).

9. The delivery device according to claim 1 or 2, characterized in The hollow space (9) is formed symmetrically with respect to a plane containing the axis of rotation (100).

10. The delivery device according to claim 9, characterized in that The hollow space (9) is formed rotationally symmetrically.

11. The delivery device according to claim 1 or 2, characterized in that A bearing seal (18) is axially located between the bearing (6) and the shaft seal (7) and axially adjoins the bearing (6), the bearing seal (18) sealing the bearing with respect to the hollow space (9).

12. The delivery device according to claim 1 or 2, characterized in that The shaft (3) protrudes axially through a shaft bore (12) of the housing (2) and is non-rotatably connected to the delivery mechanism (4), wherein the shaft seal (7) is arranged in the shaft bore (12).

13. The delivery device according to claim 1 or 2, characterized in that The shaft seal (7) is formed as a slide ring seal (8).

14. The delivery device according to claim 1, characterized in that The liquid is a coolant.

15. The delivery device according to claim 3, characterized in that The housing (2) comprises a radially inwardly protruding protrusion (17), the protrusion (17) axially positioning the bearing (6), The hollow space (9) radially expands from the protrusion (17) up to the vent (11).

16. The delivery device according to claim 6, characterized in that The housing (2) comprises a radially inwardly protruding protrusion (17), the protrusion (17) axially positioning the bearing (6), The hollow space (9) radially expands from the protrusion (17) up to the vent (15).

17. A motor vehicle (50) having a flow path (51) guiding a liquid through the motor vehicle (50) and having a delivery device (1) according to any one of claims 1 to 16 arranged in the flow path (51), the delivery device (1) delivering the liquid along the flow path (51) during operation.

18. The motor vehicle according to claim 17, characterized in that The motor vehicle (50) comprises a circuit (52) for the liquid, the flow path (51) guiding through the circuit (52) such that the liquid circulates through the circuit (52) during operation.

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