Pump unit for a lubricant pump

Abstract

The invention relates to a pump unit (4) for a lubricant pump (100), said pump unit comprising a pump housing (6) which is designed to be connected to a lubricant reservoir (2), wherein the pump housing (6) has a lubricant receiving chamber (12) having at least one lubricant outlet (20), wherein at least one pump element (14) can be arranged in the lubricant receiving chamber (12) and is designed to transport lubricant from the lubricant reservoir (2) via the lubricant receiving chamber (12) to the lubricant outlet (20), wherein the pump unit (4) also has a pump drive motor (28), in particular an electric motor, which is designed to drive the pump element (14), wherein the pump drive motor (28) has an output shaft (30), and a drive shaft (24) is also rotatably mounted in the pump housing (6), wherein the drive shaft (24) can be detachably connected to the output shaft (30) of the pump drive motor (28).

Description

[0001] Description

[0002] Pump unit for a lubricant pump

[0003] Technical area

[0004] The present invention relates to a pump unit for a lubricant pump according to the preamble of claim 1, as well as a method for providing such a pump unit.

[0005] Technical background

[0006] Lubrication systems for supplying mechanical components such as bearings, gears, etc. with lubricant typically include one or more lubricant pumps that transport the lubricant from a reservoir to the mechanical components. Such lubricant pumps can deliver the lubricant either to an intermediate delivery device, such as an injection nozzle, or directly to the mechanical component via hoses or fluid lines. In most lubricant pumps, the reservoir is detachably or permanently connected to a pump unit, particularly a pump housing, which contains the actual pump components.

[0007] The pump components are usually standardized assemblies that are used in a variety of applications. The pump housing generally comprises at least one pump element that delivers the lubricant and a pump drive motor that drives the pump element. The pump element is typically a piston pump that is capable of delivering lubricant in one direction at high pressure through the translational movement of a piston and an internal valve arrangement. The piston stroke can be described in two phases. During the suction phase, the piston is at least partially open towards the lubricant reservoir, and the internal valve arrangement creates a pressure difference so that the pressure in the piston chamber is lower than in the reservoir or in a lubricant receiving chamber of the pump housing, whereby lubricant is sucked into the piston chamber.During the ejection phase, the piston is pushed into a shaft or body of the pump element so that the lubricant is forced out of the piston chamber and into the lubrication system.

[0008] Typically, the piston is moved by an eccentric disc, which is driven in rotation by the pump drive motor. The eccentric disc converts the rotational movement into translational movement.

[0009] The pump drive motor of the lubricant pump is therefore one of the most important components. Typically, an electric motor is used as the pump drive motor, but these usually have a limited service life and must be replaced after a certain period of use. Nevertheless, the pump drive motors are usually tightly integrated into the lubricant pump and are among the first components to be installed. In most lubricant pumps, the motor is mounted from below with screws through the pump housing, as the motor types used and their mounting flanges (worm gear motors) are standard. With this design, the mounting screws in the pump housing must be sealed.Another disadvantage is that replacing the pump drive motor requires removing all the lubricant from the pump housing to gain access to the screws and to prevent leaks during disassembly or lubricant contamination. All of this makes replacing the pump drive motor a lengthy, complicated, and very time-consuming process.

[0010] It is therefore an object of the present invention to provide a pump unit for a lubricant pump which enables easy replacement of the pump drive motor.

[0011] Summary of the invention

[0012] This object is achieved by a pump unit according to claim 1. The following describes a pump unit for a lubricant pump, wherein the pump unit is equipped with a pump housing configured to be connected to a lubricant reservoir. Furthermore, the pump housing has a lubricant receiving space with at least one lubricant outlet, wherein at least one pump element can be arranged in the lubricant receiving space, which pump element is configured to convey lubricant from the lubricant reservoir via the lubricant receiving space to the lubricant outlet. Furthermore, the pump unit has a pump drive motor, in particular an electric motor, configured to drive the pump element.

[0013] In order to easily replace the pump drive motor, it is proposed that the pump drive motor has an output shaft and that a drive shaft is rotatably mounted in the pump housing, wherein the drive shaft is detachably connectable to the output shaft of the pump drive motor.

[0014] By separating the output shaft and drive shaft, the pump drive motor can be easily removed and replaced without having to dismantle the entire pump unit.

[0015] According to an advantageous embodiment, the drive shaft has a first connecting structure and the output shaft has a second connecting structure, wherein the first and second connecting structures are designed to engage with each other. These connecting structures ensure a transmission of torque from the output shaft to the drive shaft.

[0016] It is particularly preferred if the drive shaft is designed as a hollow shaft which is configured to receive the output shaft, wherein the hollow shaft is preferably closed on one side. If the drive shaft is designed as a hollow shaft and is also closed on one side in the direction of the lubricant receiving space, no contamination or leakage of the lubricant can occur, even if the pump drive motor is or is removed from the drive shaft. Furthermore, it is advantageous if the first and the second connecting structure are gears, wherein preferably the drive shaft has internal gears and the output shaft has external gears complementary to the internal gears. This allows the output shaft and drive shaft to be easily plugged into one another, enabling reliable torque transmission.

[0017] According to a further preferred embodiment, the pump housing further comprises an integrally formed base plate designed to seal off the lubricant receiving space from the outside environment, wherein the base plate further comprises at least one recess through which the drive shaft extends into the lubricant receiving space. The integrally formed base plate allows the lubricant receiving space to be sealed from the outside environment without the provision of additional sealing elements, so that lubricant can escape into an outside space only through the recess.

[0018] In order to keep this possibility of leakage as low as possible or to avoid it completely, it is also advantageous if a sealing unit is arranged between the drive shaft and the recess in the base plate, which is designed to seal the lubricant receiving space.

[0019] According to a further preferred embodiment, the drive shaft is rotatably mounted by means of at least one bearing unit, and the pump housing, in particular the recess in the base plate, is further shaped in such a way that a bearing seat is formed for the at least one bearing unit. By using a bearing unit, the drive shaft can be rotated and held frictionlessly.

[0020] It is further advantageous if the base plate has a cylindrical tube section that forms the recess, wherein the cylindrical tube section preferably has a first step with a first inner diameter and a second step with a second inner diameter, wherein the first step is designed as a seat for the sealing unit and the second step is designed as a seat for the at least one bearing unit. This enables particularly good sealing of the lubricant receiving space against the external environment and, at the same time, particularly low-friction mounting of the drive shaft.According to a further preferred embodiment, the pump housing further comprises an intermediate plate which delimits the lubricant receiving space on the side facing the lubricant reservoir and has at least one lubricant inlet opening, preferably a plurality of lubricant inlet openings, in order to transfer lubricant from the lubricant reservoir into the lubricant receiving space. , wherein the intermediate plate preferably forms a bearing seat for a further, second bearing unit which rotatably supports the drive shaft. The intermediate plate ensures good distribution of the lubricant in the lubricant receiving space and at the same time provides a second bearing for the drive shaft. The second bearing for the drive shaft enables wobble-free operation and less wear on the bearing units than with only one bearing unit.

[0021] It is particularly preferred if the intermediate plate has a recess which is designed to form the bearing seat for the second bearing unit, and wherein the drive shaft extends through the recess in the intermediate plate in the direction of the lubricant reservoir.

[0022] It is further advantageous if the intermediate plate is inserted into the pump housing as a separate element, and a sealing unit is provided between the intermediate plate and the pump housing, which seals the pump housing. Preferably, the intermediate plate and the pump housing are further configured such that they can be releasably connected to the lubricant reservoir. Since the intermediate plate is not manufactured integrally with the pump housing, components such as the pump element can be easily inserted into the lubricant receiving space and replaced. It is also possible to replace the entire intermediate plate, for example, to provide larger or smaller lubricant passages.

[0023] A particularly advantageous feature is that the pump housing, with the drive shaft mounted within it, is or can be provided as a pre-assembled unit. This allows the pump unit to be pre-assembled as a standard component and simply equipped with a custom pump drive motor and / or lubricant reservoir to meet customer requirements. This reduces inventory costs while allowing a high degree of customization and adaptability to the specific application.

[0024] According to a further preferred embodiment, the pump element is designed as a piston pump element with a translationally movable piston, and the drive shaft further comprises an eccentric designed to transform the rotational movement of the drive shaft into a translational movement of the piston. It is particularly preferred if the pump unit comprises a metering piston that is movable by means of the eccentric, wherein the metering piston is further designed to suck a predetermined amount of lubricant from the lubricant receiving chamber into a piston chamber connected to the lubricant outlet, and from there to expel it from the lubricant outlet.

[0025] Preferably, the eccentric is arranged between the first and second bearing units so that the two bearing units can support the translational movement initiated by the eccentric.

[0026] According to a further preferred embodiment, the pump housing further comprises, preferably on the base plate, at least one, preferably several, fastening means receptacles designed to fasten the pump drive motor to the pump housing. The fastening means receptacles are preferably closed off from the lubricant receptacle space, so that while the pump drive motor can be easily fastened, it is also ensured that lubricant cannot escape from the lubricant receptacle space. Additional seals that seal the fastening means receptacles can then even be dispensed with entirely.

[0027] Further advantages and advantageous embodiments are set forth in the description, the drawings, and the claims. In particular, the combinations of features set forth in the description and the drawings are purely exemplary, so the features may also be present individually or in other combinations.

[0028] Brief Description of the Figures The invention will be described in more detail below with reference to exemplary embodiments illustrated in the drawings. The exemplary embodiments and the combinations shown in the exemplary embodiments are purely exemplary and are not intended to define the scope of the invention. This scope is defined solely by the appended claims.

[0029] They show:

[0030] Fig. 1 : a schematic sectional view of a preferred embodiment of a lubricant pump

[0031] Fig. 2: a schematic view of the pump unit from Figure 1

[0032] Fig. 3: a schematic view of the pump drive unit from Figures 1 and 2 Fig. 4: various embodiments of the pump drive unit

[0033] Detailed description of the invention

[0034] In the following, identical or functionally equivalent elements are identified by the same reference symbols.

[0035] Figure 1 schematically shows a sectional view through a lubricant pump 100. The lubricant pump 100 has a reservoir 2 designed to contain lubricant, and a pump unit 4 designed to deliver lubricant from the reservoir 2 to corresponding consumers. The reservoir 2 can be detachably or permanently connected to the pump unit 4. The pump unit 4 is shown in more detail in the sectional view of Figure 2.

[0036] The pump unit 4 further comprises a pump housing 6, which is designed to separate a wet area I, namely the area in which lubricant is located, from a dry area II, the area in which, for example, electronics or drive motors are located. For this purpose, the pump housing is designed as a pot-shaped element and has side walls 8 and a base plate 10 that define a lubricant receiving space 12. The side walls 8, in turn, can be connected directly or indirectly to the lubricant reservoir 2.

[0037] Furthermore, as can be seen from Fig. 1, a pump element 14 is arranged in the lubricant receiving chamber 12. In the illustrated embodiment, this pump element is designed as a piston pump driven by a pump drive motor 28, in particular an electric motor. Such a pump element 14 has a metering piston 16 with a working chamber 17, which is movable by means of an eccentric 18 and has a suction phase or position and a discharge phase or position. The eccentric 18 serves to convert the rotary movement of the pump drive motor 28 into a translatory movement of the metering piston. When actuated by the eccentric 18, the piston 16 moves from the suction position to the discharge position, so that lubricant located in the working chamber 17 can be discharged from a lubricant outlet 20.With the aid of a return element, in the embodiment shown here a spring 22, the piston 16 is returned to its first position, while the lubricant is sucked from the lubricant receiving chamber 12 into the working chamber 17.

[0038] The eccentric 18 is therefore arranged in a rotationally fixed manner on a drive shaft 24, which in turn extends through a recess 26 in the base plate 10 of the pump housing. The drive shaft 24 can be directly an output shaft 30 of a pump drive motor 28. However, this would mean that when replacing the pump drive motor 28, the entire lubricant pump would have to be freed of lubricant, since the shaft extends into the wet area I of the lubricant pump.

[0039] In the embodiment shown in Figs. 1 and 2, it is therefore proposed that the drive shaft 24 is not identical to the output shaft 30 of the electric motor 28, but that the drive shaft 24 is merely connectable to the output shaft 30 of the electric motor 28.

[0040] Furthermore, the embodiment of Figures 1 and 2 shows that the drive shaft 24 is designed as a hollow shaft that is closed on one side, namely towards the wet area I, and thus has a blind hole 25 in which the output shaft 30 of the electric motor 28 can be received. For a torque-transmitting connection, it is further advantageous if the drive shaft 24 and the output shaft 30 each have corresponding connecting structures that can engage with one another in order to transmit the torque. In the illustrated embodiment of Figures 1 and 2, the drive shaft 24 therefore has an internal toothing 32, while the output shaft 30 has an external toothing 34 (see in particular Fig.3 and 4), wherein the internal toothing 32 and the external toothing 34 engage with each other when the output shaft 30 is connected to the drive shaft 24 in order to transmit a torque from the output shaft 30 to the drive shaft 24.

[0041] Thus, as shown in particular in Fig. 2, the pump housing 6 together with the drive shaft 24 forms a pre-assembled unit which separates the wet area I from the dry area II. Furthermore, it can be seen from the sectional view of Fig. 1 and Fig. 2 that an intermediate plate 36 is arranged on the pump housing 6, which delimits the lubricant receiving area 12 in the direction of the reservoir 2. In order to transfer lubricant from the reservoir 2 evenly into the lubricant receiving space 12 despite the intermediate plate 36, the intermediate plate 36 furthermore has a multiplicity of preferably evenly distributed lubricant passage openings 37. The intermediate plate 36 likewise has a recess 38 through which the drive shaft 24 extends.

[0042] By providing the intermediate plate 36 and the base plate 10 of the pump housing 6, the drive shaft 24 can be supported in a wobble-free manner using two bearing units 38, 40. Furthermore, it can be seen, in particular from the sectional view of Figure 2, that the drive shaft 24 is sealed off from the recess 26 using a sealing element 42, so that the wet area I is reliably separated from the dry area II. Both the intermediate plate 36 and the base plate 10 can have cylindrical sections 44, 46, 48, which are designed as bearing seats for the bearing units 38 and 40, respectively, or as sealing seats for the sealing element 42. The bearing seats or the sealing seat are preferably designed as step-shaped configurations in the cylindrical sections.

[0043] As mentioned above, in order to drive the drive shaft 24, the drive shaft 24 is connected to the output shaft 30 of the pump drive motor 28. This pump drive motor 28 is also connected to the pump housing 6 in the pump unit 4, but in the dry area II. For this purpose, the pump housing 6 has fastening receptacles 52, which are preferably designed as cylindrical extensions that are closed off towards the wet area I (blind hole). Fastening elements 56, such as screws, can be screwed into these fastening receptacles 52, by means of which the electric motor 28 can be fastened to the pump housing 6. However, the electric motors 28 can often not be fastened from below, but only from above, so that in the prior art, the pump drive motor 28 had to be fastened from the wet area I of the pump housing.For this purpose, however, the fastening receptacles 52 must be designed as through holes, which in turn must be sealed to seal off the wet and dry areas II. Furthermore, when replacing the electric motor 28, the entire lubricant pump 100 had to be de-lubricated to enable replacement and to prevent contamination of the lubricant when replacing the pump drive motor 28.

[0044] In order to also use pump drive motors 28 that are attached from above, it is further proposed to arrange a motor mount 60 (see Figs. 1, 3 and 4) between the pump housing 6 and the pump drive motor 28, which is attached to the pump housing 6 on the one hand and carries the electric motor 28 on the other. The motor mount 60 is preferably designed as a plate-shaped element 61, as can be seen in particular from Figs. 3 and 4. The plate-shaped element 61 has an upper side 62 facing the base plate 10 or the pump housing 6 and an underside 64 facing the electric motor 28. Furthermore, the motor mount 60 comprises a plurality of first fastening means receptacles 66 with which the motor mount 60 can be attached to the pump housing 6 (in Fig. 1 by means of screws 56) and a plurality of second fastening means receptacles 68, which serve to attach the electric motor (by means of screws 58).

[0045] In this case, as shown in particular in Figure 3, it is possible for the second fastening means receptacles 68 to be designed such that the electric motor 28 is fastened to the motor support 60 from the side 62 facing the pump housing 6, while the fastening means receptacles 66 enable the motor support 60 to be fastened to the base plate 10 or generally to the pump housing 6 from the side 64 facing the electric motor (see also fastening means 56 and 58 from Figure 1).

[0046] As further shown in Figures 3 and 4, in the illustrated embodiment, the motor mount 60 further comprises a motor support structure 70 designed to support the cylindrical, heavy element 29 of the electric motor 28, which houses the rotor and stator. This further ensures good fastening of the electric motor 28, even in the event of strong vibrations and shocks. As can also be seen from the exemplary embodiment in Figures 3 and 4, the motor support structure 70 can further comprise third fastening means recesses 72, in which a fastening means 74, for example a cable tie, can be received. In the illustrated embodiment, the fastening means 74 is a cable tie, which is fastened to the motor mount circumferentially around the heavy drive part 29 of the electric motor 28.Of course, instead of the cable tie 74, another fastening means can also be selected, which enables the fastening of the drive motor 28 to the motor support structure 70, for example, also by means of a circumferential support.

[0047] As can be seen from sub-figures a, b, and c of Fig. 4, the motor support structure 74 can be arranged centrally (see Fig. 4c), on the output shaft side (see Fig. 4b), or at the end (see Fig. 4a) of the heavy drive part 29 of the electric motor. It is also possible for multiple support structures 70 to be provided; for example, such a structure 70 can be provided both on the drive shaft side and at the end of the heavy drive part 29.

[0048] Also clearly visible in Figure 3 is that the output shaft 30 of the electric motor 28 is provided with the external toothing 34, which can engage with the internal toothing 32 of the drive shaft 24.

[0049] In addition to the improved attachment option for the pump drive motors 28 using the motor mount 60, the motor mount 60 can also be used to attach different types of electric motors or different designs of electric motors to the same pump housings. For example, the hole and screw patterns of the various electric motors 28 vary, so that when the electric motor 28 was attached directly to the pump housing 6, a separate pump housing 6 had to be provided for each type of electric motor 28 in the prior art. With the help of the motor mount 60, however, it is possible for only the motor mount 60 to be manufactured individually for the respective electric motors 28, while the pump housing 6 can remain the same as a standard component for all electric motors 28. This reduces inventory and also enables the replacement of existing electric motors with new electric motors that, for example, have a different hole or screw pattern.This makes it easy to equip existing pumps with innovative electric motors. The motor mount 60 and the pump housing 6 can be designed as injection-molded plastic components, for example, made of fiber-reinforced plastic, but it is also possible to provide them from metal, for example, as die-cast aluminum or injection-molded aluminum elements. Of course, other materials are also possible. Likewise, the pump housing and motor mount may not be made of the same material.

[0050] Although the combination of motor mount 60 and two-piece drive shaft 24; 30 is preferred, the motor mount 60 can also be used with one-piece drive shafts. Thus, the electric motor 28 can be attached to the pump housing using the motor mount 60, even if the output shaft 30 of the motor extends into the wet area I and no additional drive shaft 24 is provided.

[0051] Overall, the above-described configurations make it possible to completely replace the motor in dry area II without having to empty the pump housing 6 or lubricant reservoir 2. Furthermore, the motor mount 60 can be easily adapted to the different hole patterns of various pump drive motors 28, allowing one motor type to be replaced with another without making changes to the pump housing 6. Furthermore, by dividing the drive train into two interconnected shafts (a drive shaft 24 in the pump housing and an output shaft 30 from the motor), the motor can be mounted at a later time, and the pump housing 6 can be pre-assembled without the motor or motor mount. Furthermore, this also allows for later variant creation based on the motor type.

[0052] This allows for easy assembly and disassembly of the motor 28 and improved maintenance, reducing the risk of leaks and counteracting contamination during motor maintenance. Furthermore, the motor mount's attachment to the pump housing is significantly improved to withstand even strong shocks and vibrations. The two-piece shaft allows for later production of variants using different motor types. This also provides greater flexibility for the use of different motor types with different hole patterns.

[0053] 100 Lubricant pump

[0054] 2 reservoirs

[0055] 4 Pump unit

[0056] 6 Pump housing

[0057] 8 pages

[0058] 10 Base plate

[0059] 12 Lubricant receiving chamber

[0060] 14 Pump element

[0061] 16 dosing pistons

[0062] 17 Workspace

[0063] 18 eccentric

[0064] 20 Lubricant outlet

[0065] 22 spring

[0066] 24 Drive shaft

[0067] 25 blind hole drilling

[0068] 26 recess

[0069] 28 Pump drive motor (electric motor)

[0070] 29 elements

[0071] 30 Output shaft

[0072] 32 internal gearing

[0073] 34 external gearing

[0074] 36 intermediate plate

[0075] 38, 40 storage unit

[0076] 37 Lubricant passage opening

[0077] 42 Sealing element

[0078] 44, 46, 48 cylindrical sections

[0079] 56, 58 Fastening element Engine support plate-shaped element Top side Bottom side , 66, 68 Fastener receptacle Engine support structure (engine support structure) Fastener recess Fastener

Claims

Patent claims Pump unit for lubricant pump 1.Pump unit (4) for a lubricant pump (100) with a pump housing (6) which is designed to be connected to a lubricant reservoir (2), wherein the pump housing (6) has a lubricant receiving space (12) with at least one lubricant outlet (20), wherein at least one pump element (14) can be arranged in the lubricant receiving space (12), which is designed to convey lubricant from the lubricant reservoir (2) via the lubricant receiving space (12) to the lubricant outlet (20), wherein the pump unit (4) further comprises a pump drive motor (28), in particular an electric motor, which is designed to drive the pump element (14), characterized in that the pump drive motor (28) has an output shaft (30) and a drive shaft (24) is rotatably mounted in the pump housing (6), wherein the drive shaft (24) is detachably connected to the output shaft (30) of the Pump drive motor (28) can be connected.

2. Pump unit (4) according to claim 1, wherein the drive shaft (24) has a first connecting structure and the output shaft (30) has a second connecting structure, the first and second connecting structures being designed to engage with each other.

3. Pump unit (4) according to claim 1 or 2, wherein the drive shaft (24) is designed as a hollow shaft which is adapted to receive the output shaft (30), wherein the hollow shaft is preferably designed to be closed on one side.

4. Pump unit (4) according to claim 2 or 3, wherein the first and the second connecting structure is a toothing, wherein preferably the drive shaft (24) has an internal toothing (32) and the output shaft (30) has an external toothing (34) complementary to the internal toothing.

5. Pump unit (4) according to one of the preceding claims, wherein the pump housing (6) further comprises an integrally formed base plate (10) which is designed to close off the lubricant receiving space (12) from an external environment, wherein the base plate (10) further comprises at least one recess through which the drive shaft (24) extends into the lubricant receiving space (12).

6. Pump unit (4) according to claim 5, wherein a sealing unit (42) is further arranged between the drive shaft (24) and the recess of the base plate (10), which sealing unit is designed to seal the lubricant receiving space (12).

7. Pump unit (4) according to one of the preceding claims, wherein the drive shaft (24) is rotatably mounted by means of at least one bearing unit (38; 40) and the pump housing (6), in particular the recess in the base plate (10), is further shaped such that a bearing seat for the at least one bearing unit (38; 40) is formed.

8. Pump unit (4) according to one of claims 5 to 7, wherein the base plate (10) further comprises a cylindrical tube section (44; 46; 48) which forms the recess, wherein preferably the cylindrical tube section (44; 46; 48) has a first step with a first inner diameter and a second step with a second inner diameter, wherein the first step is designed as a seat for the sealing unit (42) and the second step is designed as a seat for the at least one bearing unit (38; 40).

9. Pump unit (4) according to one of the preceding claims, wherein the pump housing (6) further comprises an intermediate plate (36) which delimits the lubricant receiving space (12) on the side facing the lubricant reservoir (2) and has at least one lubricant inlet opening (37), preferably a plurality of lubricant inlet openings (37), in order to supply lubricant from the Lubricant reservoir (2) into the lubricant receiving space (12), wherein the intermediate plate (36) forms a bearing seat for a further second bearing unit (38; 40) which rotatably supports the drive shaft (24).

10. Pump unit (4) according to claim 9, wherein the intermediate plate (36) has a recess designed to form the bearing seat for the second bearing unit (38; 40), and wherein the drive shaft (24) extends through the recess in the intermediate plate (36) in the direction of the lubricant reservoir (2).

11. Pump unit (4) according to one of claims 9 to 10, wherein the intermediate plate (36) is inserted into the pump housing (6) as a separate element and a sealing unit (42) is provided between the intermediate plate (36) and the pump housing (6), which seals the pump housing (6), wherein preferably the intermediate plate (36) and the pump housing (6) are further designed such that they can be detachably connected to the lubricant reservoir (2).

12. Pump unit (4) according to one of the preceding claims, wherein the pump housing (6) with the drive shaft (24) mounted therein is provided as a preassembled unit.

13. Pump unit (4) according to one of the preceding claims, wherein the pump housing (6) further comprises, preferably on the base plate (10), at least one, preferably a plurality of, fastening means receptacles (52; 66, 68) which are designed to fasten the pump drive motor (28) to the pump housing (6).

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