DE102018214661B4 - Liquid pump and motor vehicle with a liquid pump - Google Patents

Abstract

Liquid pump for a motor vehicle with an internal combustion engine and a crankshaft (2) driven by the internal combustion engine, the liquid pump having a housing (3), a drive shaft (7) rotatably mounted at least partially in the housing (3), and an output shaft rotatably mounted in the housing (3). (9), which is coupled to the drive shaft (7) in a contact-free torque-transmitting manner via a magnetic gear (10), and has a pump impeller (11) which is non-rotatably connected to the output shaft (9) for conveying a liquid, characterized in that one in the housing (9) 3) recorded mass-spring-damper unit (12) is rotatably connected to the drive shaft (7) so that it rotates, the mass-spring-damper unit (12) being designed and arranged to prevent vibrations of the drive shaft (7) in radial and/or or axial and / or tangential direction, the mass-spring damper unit (12) having a first mass (15), a second mass (16) and a rubber-elastic damping element (17) for mechanically connecting the first (15) to the second mass (16), and wherein a first part (18) of the first mass (15) is hollow cylindrical and is connected radially to the drive shaft (7) by a connecting disk (19) forming a second part (19) of the first mass (15). is kept spaced apart, the rubber-elastic damping element (17) being arranged on the hollow cylindrical first part (18) and the second mass (16) being arranged in a ring and/or disk shape on the rubber-elastic damping element (17), the drive shaft (7) being rigid with it the crankshaft (2) is connected.

Description

The present invention relates to a liquid pump for a motor vehicle according to the preamble of claim 1.

Motor vehicles with a liquid pump, for example a coolant pump for conveying a coolant through a cooling circuit of an internal combustion engine and/or electric machine, as well as such liquid pumps are known in various designs.

The DE 10 2014 213 486 A1 deals with a pulley arrangement. A drive shaft protruding from an engine housing of a motor vehicle and acting as a torque introduction element is connected to a torsional vibration damper provided in the belt pulley.

The US 4,644,206 A deals with a continuously variable torque converter. A drive shaft enters a housing to provide mechanical driving force to the electromagnetic torque converter. A main armature is non-rotatably connected to the input shaft, i.e. the drive shaft. The drive shaft penetrates the main armature and is rotatably mounted opposite a commutator in a bearing which is arranged in an end region of a field runner. This end region is connected to an output shaft in a rotationally fixed manner. The output shaft is mounted in an end wall of the housing.

The DE 25 10 779 A1 relates to a vibration or oscillation unit for use on an oscillating body, comprising a core element with an outer peripheral surface formed thereon in the axial direction, an inertial mass element with an inner peripheral surface which is the outer peripheral surface of the core element and is spaced therefrom A damping device made of compressible, compliant material disposed between the outer peripheral surface of the core element and the inner peripheral surface of the inertial mass element, a peripheral surface thereof being chemically attached to the opposite peripheral surface of one of these elements, the damping device being under limited compression, and between the outer peripheral surface of the core element and the inner peripheral surface of the inertia mass element, a holding device is arranged, one peripheral surface of which is chemically attached to the opposite peripheral surface of the damping device, and the opposite peripheral surface of which is fixed to the opposite peripheral surface of the other element in a tight fit, and wherein for attachment The unit is provided with a device on the oscillating body.

The US 6,007,303 A (also DE 197 46 359 A1 ) discloses a controllable coolant pump for a motor vehicle, in which its drive shaft is driven by an internal combustion engine of the motor vehicle via a belt drive. A pump impeller provided on the pump output side is coupled to the drive shaft in a torque-transmitting manner via a magnetic clutch, the magnetic clutch having two clutch disks spaced apart from one another in the axial direction via an air gap. The first clutch disc is a magnetic disc, the second is a hysteresis disc. The width of the air gap can be changed via an adjustment mechanism in order to be able to adjust the maximum torque that can be transmitted by the clutch and, as a result, the speed or delivery capacity of the clutch independently of a pump drive speed.

The US 7,503,753 B2 (also DE 60 2005 000 638 T2 ) describes a fluid pump driven by a motor, whose speed and, as a result, its delivery capacity can be controlled via a planetary gear mechanism independently of a drive speed.

Furthermore, from the CN 102 434 467 A a pump driven by a motor is known, in which the motor-generated drive torque is transmitted contact-free via a magnetic coupling to a pump impeller attached to a pump output shaft. The magnetic clutch has a fixed transmission ratio of its input speed to its output speed, so that the impeller rotates at a speed other than that specified by the drive motor.

Shows a magnetic clutch that can be changed in its transmission ratio CN 102 624 197 B. An air gap provided between two magnetically effective coupling halves can be changed using an adjustment mechanism.

The CN 104 065 236 B discloses a permanent magnetic speed control in which a magnetic field strength of a magnetic coupling air gap is continuously adjustable in order to be able to determine the speed ratio between a driving and a driven rotor.

Various other possible configurations of magnetic couplings are also included EP 2 644 946 B1 described.

It is also generally known that a motor vehicle's coolant or oil pump is purely electric torically in order to be able to determine the delivery rate by controlling the speed of the electric motor driving the pump. However, depending on the pump delivery capacity to be provided, a high level of electrical power is required, which in turn must be provided by the vehicle's own battery.

In general, rotating bodies cause oscillations or vibrations, for example due to an imbalance of the rotating masses, which can lead to increased wear, the generation of structure-borne and/or airborne noise and the like.

Against this background, the present invention is based on the object of providing an improved liquid pump which is low-wear and low-friction and can be operated energy-efficiently, is compact and simple in construction and can also be connected to a drive unit via an easily realizable, mechanically rigid coupling. In addition, the liquid pump should be inexpensive to produce.

This task is solved by a liquid pump with the features of claim 1.

Shown is a liquid pump for a motor vehicle with an internal combustion engine and a crankshaft driven by the internal combustion engine, comprising a housing, a drive shaft rotatably mounted at least partially in the housing, an output shaft rotatably mounted in the housing, which is coupled to the drive shaft in a contact-free torque-transmitting manner via a magnetic gear, and a pump impeller that is non-rotatably connected to the output shaft for pumping a liquid. According to the invention, a mass-spring-damper unit accommodated in the housing is connected to the drive shaft in a rotationally fixed manner and rotates therewith, the mass-spring damper unit being designed and arranged to dampen vibrations of the drive shaft in the radial and/or axial and/or tangential direction, wherein the mass-spring-damper unit has a first mass, a second mass and a rubber-elastic damping element for mechanically connecting the first to the second mass, and wherein a first part of the first mass is hollow cylindrical and is formed by a second part of the first mass Connecting disk is held radially at a distance from the drive shaft, the rubber-elastic damping element being arranged on the hollow cylindrical first part and the second mass being arranged in a ring and/or disc-shaped manner on the rubber-elastic damping element, the drive shaft being rigidly connected to the crankshaft.

Further particularly advantageous embodiments of the invention are disclosed in the respective subclaims.

It should be noted that the features listed individually in the following description can be combined with one another in any technically sensible manner and show further refinements of the invention. The description additionally characterizes and specifies the invention, particularly in connection with the figures.

Furthermore, it should be noted that a conjunction “and/or” used hereinafter between two features and linking them together must always be interpreted in such a way that only the first feature can be present in a first embodiment of the subject matter according to the invention, and only in a second embodiment the second feature can be present and in a third embodiment both the first and the second feature can be present.

A liquid pump, for example a coolant or oil pump, for a motor vehicle, such as a vehicle powered purely by an internal combustion engine or a hybrid vehicle, has a pump housing, a drive shaft rotatably mounted at least partially in the housing, and an output shaft rotatably mounted in the housing , which is coupled to the drive shaft in a non-contact torque-transmitting manner via a magnetic gear, and a pump impeller that is non-rotatably connected to the output shaft for conveying a liquid. According to the invention, as already mentioned above, a mass-spring-damper unit accommodated in the housing is connected to the drive shaft in a rotationally fixed manner and rotates therewith. The mass-spring-damper unit is designed and arranged to dampen vibrations of the drive shaft in the radial and/or axial and/or tangential direction.

The mass-spring-damper unit accommodated in the housing, that is, enclosed by it, which essentially has at least one mass, one spring and one damping element, enables, on the one hand, a particularly compact, maintenance-free or at least very low-maintenance design of the liquid pump. The mass-spring-damper unit effectively prevents oscillations or vibrations of the rotating pump components from being dampened, so that, on the one hand, these cannot propagate from the pump in the form of structure-borne and/or airborne noise in a system having the pump. On the other hand, vibrations that are introduced into the pump from outside via the drive shaft, for example, are dampened by the mass-spring-damper unit in such a way that they essentially not or only to a significantly reduced extent in the output side, that is, in particular in the liquid to be pumped by the pump. In other words, by appropriately designing or dimensioning the mass, the spring and/or the damper, the mass-spring-damper unit advantageously makes it possible to compensate for construction-related imbalances that can be determined in advance as well as vibration processes that are dynamically introduced into the pump from outside during pump operation to dampen. This can significantly reduce the mechanical wear on the pump or on the pump components that are particularly stressed by oscillations and vibrations.

In addition, the mass-spring-damper unit, due to its vibration damping properties, effectively prevents a disturbance of the magnetic fields generated by the magnetic gear for torque coupling in the magnetic gear, which would otherwise be caused by a vibration introduction into the magnetic gear, which calms the rotational movement of the impeller and thus also the fluid flow.

Due to its vibration damping effect integrated in the pump housing, the mass-spring-damper unit also makes it possible to connect the liquid pump directly and rigidly to a drive unit, for example a motor, for example to an internal combustion engine of a motor vehicle, according to the invention directly to a crankshaft driven by the internal combustion engine . An otherwise frequently used belt drive with an inherent, vibration-damping property for connecting a liquid pump to the drive unit driving the pump can therefore be completely dispensed with, which enables a much more compact arrangement of the liquid pump and the drive unit driving it. In addition, a belt drive causes additional friction in the system containing the pump and is also subject to wear, which requires regular maintenance over the operational life of the pump. The belt drive also represents a potential source of error, which increases the probability of failure of the liquid pump and thus of the entire system containing the pump. The liquid pump according to the present invention eliminates all of these disadvantages.

As already mentioned above, the mass-spring-damper unit is preferably completely accommodated in the pump housing, that is to say completely enclosed by it, so that it is reliably protected from any external influences.

According to an advantageous embodiment of the invention, the housing has a first interior space that accommodates the liquid to be pumped and a liquid-free second interior space, the pump impeller being arranged in the first interior space and the mass-spring damper unit being arranged in the second interior space. The second interior is separated from the first interior of the pump housing in a liquid-tight manner, so that the mass-spring damper unit is not subject to any impairment by the liquid to be pumped by the pump impeller, which ensures a long-lasting, maintenance-free vibration damping function of the mass-spring damper unit.

According to the invention, as already mentioned above, it is provided that the mass-spring-damper unit has a first mass, a second mass and a rubber-elastic damping element for mechanically connecting the first to the second mass. In other words, the damping element is inserted between the two masses. The rubber-elastic damping element, for example a rubber-like elastomer, enables a certain relative movement (vibration) of the two masses against each other, in particular in the radial and/or axial and/or tangential (circumferential) direction, but at the same time also ensures a vibration-damping effect, for example The deformation work caused by the masses vibrating relative to one another is partially converted into heat, for example through internal friction. The two masses and the damping element are dimensioned in a generally known manner in terms of their respective weight and their spatial dimensions in a generally known manner with regard to the desired vibration damping capacity (frequency, amplitude). their respective effective inertial masses are determined. For example, the first mass for a specific pump series can always have essentially the same dimensions and the same weight, so that advantageously only the second mass has to be adapted to the respective vibration processes to be expected during operation. For example, the second mass can also be individually adapted to the design-related imbalance found in a specific liquid pump or an entire pump series through targeted material removal or application in order to compensate for this for subsequent, intended operation.

According to a preferred embodiment of the invention, the first mass can be formed in one piece with the drive shaft, so that on a Additional connection mechanism, for example a positive connection using screws, rivets and the like, a frictional connection using clamping seats or a material connection by gluing, can be dispensed with in order to produce the rotationally fixed connection between the first mass and the drive shaft. However, the present invention is not limited to the one-piece design of the first mass and drive shaft. In addition, the first mass can essentially also be formed by a part of the drive shaft itself.

According to the invention, as already mentioned above, it is provided that a first part of the first mass is hollow cylindrical and is held at a radial distance from the drive shaft by a connecting disk forming a second part of the first mass, the rubber-elastic damping element being arranged on the hollow cylindrical first part and the second mass is arranged in a ring and/or disk shape on the rubber-elastic damping element. In other words, the first and second parts of the first mass essentially form a cup-shaped or cage-shaped support to which the second mass is connected in such a way that it can oscillate via the damping element. The term “pane” is to be interpreted broadly in the sense of the present invention and should not be limited to a full-surface (closed) pane. Rather, spoke-shaped, rod-shaped or circular segment-shaped configurations of the connecting disk should also be included in the term “connecting disk”. Furthermore, this connecting disk can be flat or curved (e.g. bowl-shaped) or have another shape, provided that it arranges and holds the first part of the first mass in the manner described above at a radial distance from the drive shaft.

The second mass can have a substantially ring-shaped and/or disk-shaped configuration, similar to the first mass.

According to a still further preferred embodiment of the invention, the rubber-elastic damping element is arranged on an inner peripheral surface and/or outer peripheral surface of the hollow cylindrical first part of the first mass, so that a particularly compact mass-spring damping unit can be achieved.

According to a further advantageous embodiment of the invention, the magnetic transmission is a magnetic transmission that is continuously adjustable during operation with regard to its transmission ratio of a speed of the drive shaft to a speed of the output shaft. This means that the speed of the pump impeller and thus the amount of liquid delivered per unit of time by the liquid pump can be adjusted independently of the speed of the drive shaft depending on the actual requirement, whereby demand-based, energy-efficient operation of the liquid pump can be achieved.

A yet further advantageous embodiment of the invention provides that the magnetic transmission supports the output shaft in the housing without contact by the magnetic field forces generated in the magnetic transmission, in particular at least in the radial direction, so that the output shaft is rotatably mounted in the pump housing and the liquid pump without friction, wear and maintenance can be operated particularly energy-efficiently. Rolling bearings for the drive shaft can therefore be completely dispensed with.

According to a further aspect of the invention, we provide a motor vehicle, in particular a hybrid vehicle, which has an internal combustion engine with a crankshaft driven by it. Hybrid vehicles in the sense of the present invention are all known hybrid vehicles which, in addition to the internal combustion engine, also have at least one electric machine (motor and/or generator). The motor vehicle according to the invention has a liquid pump according to one of the previously described embodiments. The drive shaft of the pump is rigidly, preferably directly, connected to the crankshaft. The resulting arrangement of liquid pump and drive unit in the form of the internal combustion engine can be built very compactly and cost-effectively and also allows energy-efficient operation of the motor vehicle, in which an electrical energy storage device (battery) carried in the vehicle is not burdened by the pump operation.

With regard to motor vehicle-related definitions of terms and the effects and advantages of motor vehicle-related features, reference is made to the above explanations of corresponding definitions, effects and advantages with regard to the liquid pump according to the invention. Disclosures herein regarding the liquid pump according to the invention should also be able to be used in a corresponding manner to define the motor vehicle according to the invention, unless this is expressly excluded here. Likewise, disclosures herein regarding the motor vehicle according to the invention should be able to be used in a corresponding manner to define the liquid pump according to the invention, unless this is also expressly excluded here. In this respect, a repetition of explanations of the same features, their effects and advantages with regard to the liquid pump according to the invention disclosed herein and the inventive device disclosed herein are referred to here Motor vehicle largely omitted in favor of a more compact description.

Further features and advantages of the invention result from the following description of a non-restrictive exemplary embodiment of the invention, which is explained in more detail below with reference to the figure only contained in the accompanying drawing.

1 schematically represents a partial longitudinal cross section (here an upper half) of an exemplary embodiment of a liquid pump 1 for a motor vehicle according to the invention, not shown in detail. In the exemplary embodiment shown, the liquid pump 1 is a water pump and the motor vehicle containing the liquid pump 1 is a hybrid vehicle. In addition to an electric motor, also not shown, the hybrid vehicle has an internal combustion engine (not shown) which drives a crankshaft 2. How 1 As can be clearly seen, the crankshaft 2 of the internal combustion engine is directly and rigidly connected to the pump 1 in order to drive it, as will be described in more detail below.

As in 1 can also be seen, the pump 1 has a two-part housing 3, which in turn has a removable housing cover 4, which can be fastened to a housing plate 5, for example via 1 screwing devices to be recognized 6.

1 It can also be seen that in the housing 3 at least partially a drive shaft 7 is rotatably mounted, which is directly and rigidly connected to the crankshaft 2 of the internal combustion engine, in the present case via a correspondingly designed screw means 8 which engages in an inner recess of the crankshaft 2. Furthermore, An output shaft 9 is rotatably mounted in the housing 3. The output shaft 9 is coupled to the drive shaft 7 in a contact-free, torque-transmitting manner via a known magnetic gear 10. A pump impeller 11 for conveying a liquid, for example water, oil and the like, is connected to the output shaft 9 in a rotationally fixed manner.

At the in 1 In the illustrated embodiment of the liquid pump 1, a mass-spring-damper unit 12, which is accommodated in the housing 3 and rotates with the drive shaft 7, is connected in a rotationally fixed manner. The mass-spring-damper unit 12 is designed and arranged to dampen vibrations of the drive shaft 7 in the radial and/or axial and/or tangential (circumferential) direction.

As in 1 can also be clearly seen, the housing 3 has a first interior space 13 which accommodates the liquid to be pumped and a liquid-free second interior space 14, the pump impeller 11 being arranged in the first interior space 13 in the exemplary embodiment of the pump 1 shown and the mass-spring- Damper unit 12 is arranged in the second interior 14 and is therefore completely accommodated in the housing 3. It is understood that the first interior 13 is separated in a liquid-tight manner from the second interior 14 via corresponding sealing means, for example a sealing ring, provided in the area of the entry point of the output shaft 9 into the first interior 13.

The mass-spring-damper unit 12 of the in 1 The exemplary embodiment of the pump 1 shown has a first mass 15, a second mass 16 and a rubber-elastic damping element 17, for example a rubber-like elastomer with both resilient and motion-damping properties, for mechanically connecting the first mass 15 to the second mass 16. The first and second masses 15, 16 are preferably formed from a metal material, for example iron, steel, aluminum and the like. The first mass 15 is formed in one piece with the drive shaft 7 in the pump 1, as in 1 is easy to see.

In particular, the first mass 15 of the mass-spring-damper unit 12 of the exemplary liquid pump 1 has a hollow cylindrical first part 18 and a disk-shaped second part 19. The disk-shaped second part 19 (also referred to herein as a connecting disk) is connected in one piece to the drive shaft 7 , the hollow cylindrical or annular first part 18 is in turn integral with the second part 19. The first and second parts 18, 19 of the first mass 15 together form a top or cage that opens in the axial direction of the drive shaft 7 towards the pump output side, wherein the hollow cylindrical first part 18 of the first mass 15 is held at a radial distance from the connecting disk 19 to the drive shaft 7. How 1 can also be seen, the rubber-elastic damping element 17 is arranged on the hollow cylindrical first part 18, in particular on its inner circumferential surface, and the second mass 16 of the pump 1 shown is arranged essentially in a ring shape on the rubber-elastic damping element 17, in particular on its inner circumferential surface. Thus, both masses 15 and 16, including the rubber-elastic damping element 17, rotate together with the drive shaft 7, with the damping element 17 having a certain relative movement between the first mass 15 and the second mass 16 in the oscillatory manner described herein at the same time enables a motion-damping manner to effectively dampen vibrations of the desired frequency and amplitude, in particular of the drive shaft 7, so that these cannot primarily propagate into the magnetic gear 10.

The magnetic gear 10 of the in 1 The liquid pump 1 shown has a structure that is known per se, as is also shown, for example, in the prior art discussed at the beginning. Like just schematically in 1 is shown, the magnetic gear 10 essentially has an inner rotor 20, which in the present case is formed by an axial section of the drive shaft 7 itself, an outer rotor 21 arranged coaxially to the inner rotor 20 and an outer rotor 21 inserted between the inner and outer rotors 20, 21 Modulation ring 22, which in the present case is formed by a free, essentially cup-shaped end section of the output shaft 9. The inner and outer rotors 20, 21 are each equipped with a different number of permanent magnets 23. The modulation ring 22 consists of ferromagnetic material and serves to modulate the magnetic fields generated between the permanent magnets 23. The inner rotor 20, the outer rotor 21 and the modulation ring 22 can in principle each be rotatable independently of one another. However, the magnetic field generated by the permanent magnets 23 and modulated by the modulation ring 22 determines a specific speed ratio between two rotatable components of the magnetic transmission 10, in the present case for example between the inner rotor 20 and the modulation ring 22.

Thus, a rotational movement of the inner rotor 20 or the permanent magnets 23 attached to it, which is predetermined via the drive shaft 7, is achieved with the outer rotor 21 held fixed to the housing, as in 1 shown, translated into a rotational movement of the modulation ring 22 in the direction of rotation opposite to the direction of rotation of the inner rotor 20 with a different rotational speed compared to the rotational speed of the inner rotor 20.

The gear ratio can also be changed by rotating the outer rotor 21. A rotation of the outer rotor 21 can, for example, be effected purely mechanically by a preferably electric motor-driven adjusting device (not shown). Alternatively, it can also be effected in a purely electromagnetic, non-contact manner by an additional magnetic field generated by correspondingly electrically energized conductors (also not shown). The current conductors form a housing-fixed, static part of the magnetic gear, the spatial arrangement of which is selected relative to the outer rotor 21 so that the above-described rotation of the outer rotor 21 or even just a magnetic field influence on the permanent magnets 23 without rotation of the outer rotor 21 by corresponding current supply Conductor is effected in the manner that specifies the desired transmission ratio.

In the case of the magnetic gear 10 in 1 In the pump 1 shown, the gear ratio of a speed of the drive shaft 7 to a speed of the output shaft 9 can be changed during pump operation in the manner described above in accordance with an actually required pump delivery capacity, in particular adjusted continuously (herein also referred to as a continuously variable magnetic gear).

Furthermore, in 1 It can be seen that the magnetic gear 10 supports the output shaft 9 in the housing 3 without contact. Rolling bearings for rotatably supporting the output shaft 9 in the housing 3 can therefore advantageously be completely dispensed with.

The liquid pump according to the invention described above for a motor vehicle, in particular for a hybrid vehicle, is not limited to the embodiment disclosed herein, but also includes further embodiments with the same effect, which result from technically sensible further combinations of the features described herein. The same applies in a corresponding manner to the motor vehicle according to the invention disclosed herein, in particular a hybrid vehicle.

In a particularly preferred embodiment, the liquid pump according to the invention is used as a water or coolant pump driven directly by an internal combustion engine via its crankshaft or as an oil pump in a hybrid vehicle.

List of reference symbols:

1

liquid pump

2

crankshaft

3

Housing

4

Housing cover

5

Housing plate

6

screwing means

7

drive shaft

8th

screwing means

9

output shaft

10

Magnetic gear

11

Pump impeller

12

Mass-spring-damper unit

13

First interior

14

Second interior

15

First mass

16

Second mass

17

Rubber-elastic damping element

18

Hollow cylindrical first part of 15

19

Disc-shaped second part of 15 / connecting disc

20

Inner rotor

21

Outer rotor

22

modulation ring

23

Permanent magnet

Claims (6)

Liquid pump for a motor vehicle with an internal combustion engine and a crankshaft (2) driven by the internal combustion engine, the liquid pump having a housing (3), a drive shaft (7) rotatably mounted at least partially in the housing (3), and an output shaft rotatably mounted in the housing (3). (9), which is coupled to the drive shaft (7) in a contact-free torque-transmitting manner via a magnetic gear (10), and has a pump impeller (11) which is non-rotatably connected to the output shaft (9) for conveying a liquid, characterized in that one in the housing (9) 3) recorded mass-spring-damper unit (12) is rotatably connected to the drive shaft (7) so that it rotates, the mass-spring-damper unit (12) being designed and arranged to prevent vibrations of the drive shaft (7) in radial and/or or axial and / or tangential direction, the mass-spring damper unit (12) having a first mass (15), a second mass (16) and a rubber-elastic damping element (17) for mechanically connecting the first (15) to the second mass (16), and wherein a first part (18) of the first mass (15) is hollow cylindrical and is connected radially to the drive shaft (7) by a connecting disk (19) forming a second part (19) of the first mass (15). is kept spaced apart, the rubber-elastic damping element (17) being arranged on the hollow cylindrical first part (18) and the second mass (16) being arranged in a ring and/or disk shape on the rubber-elastic damping element (17), the drive shaft (7) being rigid with it the crankshaft (2) is connected. liquid pump after Claim 1 , characterized in that the housing (3) has a first interior space (13) that accommodates the liquid to be pumped and a liquid-free second interior space (14), the pump impeller (11) being arranged in the first interior space (13) and the mass spring -Damper unit (12) is arranged in the second interior (14). liquid pump after Claim 1 or 2 , characterized in that the first mass (15) is formed in one piece with the drive shaft (7). Liquid pump according to the preceding claim, characterized in that the rubber-elastic damping element (17) is arranged on an inner peripheral surface and/or outer peripheral surface of the hollow cylindrical first part (18) of the first mass (15). Liquid pump according to one of the preceding claims, characterized in that the magnetic gear (10) is a magnetic gear that is continuously adjustable during its operation with regard to its transmission ratio of a speed of the drive shaft (7) to a speed of the output shaft (9). Liquid pump according to one of the preceding claims, characterized in that the magnetic gear (10) supports the output shaft (9) in the housing (3) without contact.

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