Pump insert and pump array comprising such a pump insert

Abstract

A pump insert (1) for arranging in an accommodating space (104), the pump insert (1) comprising: a pump (10) comprising a pump chamber (15) and a delivery element (11) which can rotate about a rotational axis (D) and which is arranged in the pump chamber (15); an electric motor (20) comprising a rotor (21), which can rotate about the rotational axis (D), and a stator (22); and a drive shaft (30) which is mounted such that it can rotate about the rotational axis (D), wherein the rotor (21) and the delivery element (11) are connected via the drive shaft (30) in such a way that rotating the rotor (21) causes the delivery element (11) to rotate.

Claims

1. A pump array, comprising an accommodating housing which forms an accommodating space with an end-facing wall and a circumferential wall and a pump insert, which is at least partially arranged in the accommodating space, the pump insert comprising: a pump comprising a pump chamber and a delivery element which is rotatable about a rotational axis and which is arranged in the pump chamber; an electric motor comprising a rotor, which is rotatable about the rotational axis, and a stator; a drive shaft which is mounted such that it is rotatable about the rotational axis, wherein the rotor and the delivery element are connected via the drive shaft in such a way that rotating the rotor causes the delivery element to rotate; and an inlet, which is embodied to feed fluid to the pump chamber, and/or an outlet, which is adapted to discharge fluid from the pump chamber, on the side pointing towards the end-facing wall of the accommodating space, wherein the end-facing wall of the accommodating housing comprises a feed channel and a drainage channel; and wherein the pump array further comprises a tubular connecting element, which is adapted to be inserted into the feed channel from the side of the accommodating space and which is inserted into the inlet and arranged between the feed channel and the inlet and connects them in fluid communication, and a tubular connecting element, which is adapted to be inserted into the drainage channel from the side of the accommodating space and which is inserted into the outlet and arranged between the drainage channel and the outlet and connects them in fluid communication.

2. The pump insert according to claim 1, wherein the pump insert comprises an assembly structure using which the pump insert can be fastened to the accommodating housing.

3. The pump insert according to claim 2, wherein the pump insert comprises control electronics for controlling the electric motor, wherein a thermal bridge is formed between the control electronics and the assembly structure, via which heat can be transmitted from the control electronics to the assembly structure.

4. The pump insert according to claim 3, wherein a thermally conductive element is arranged between the control electronics and the assembly structure.

5. The pump insert according to claim 3, wherein the control electronics are arranged at least partially on a carrier, wherein in the region of (each of) one or more components of the control electronics, a thermally conductive element is arranged between the component and the assembly structure and/or one or more thermally conductive elements are arranged between the carrier and the assembly structure.

6. The pump insert according to claim 2, further comprising an electronics housing which is fastened to the assembly structure and in which control electronics for the electric motor are arranged, wherein the electronics housing comprises one or more hold-down elements which press a carrier, on which the control electronics are at least partially arranged, against or onto the assembly structure.

7. The pump insert according to claim 4, wherein the assembly structure comprises at least one passage through which at least one contact element extends which electrically contacts the control electronics unit and at least one coil of the stator.

8. The pump insert according to claim 2, wherein the drive shaft is supported on the assembly structure such that it can rotate about the rotational axis.

9. The pump insert according claim 1, wherein the pump insert comprises a motor space outlet which connects a motor space, which is surrounded by the stator on the circumferential side, in fluid communication with the outer side of the pump insert and/or emerges onto the outer side.

10. The pump array according to claim 2, wherein a thermal bridge is formed between the assembly structure and the accommodating housing, via which heat can be transmitted from the assembly structure to the accommodating housing.

11. The pump array according to claim 2, wherein the assembly structure abuts the accommodating housing.

12. The pump array according to claim 2, wherein a thermally conductive element is arranged between the assembly structure and the accommodating housing.

13. The pump array according to claim 1, wherein a thermal bridge formed between an assembly structure of the pump insert and the accommodating housing, the assembly structure and a thermal bridge formed between the assembly structure and control electronics embodied to control the motor are adjusted to each other such that the heat generated in the control electronics while the electric motor is in operation is or can be at least mostly discharged into the accommodating housing via the thermal bridge formed between the control electronics and the assembly structure, via the assembly structure and via the thermal bridge formed between the assembly structure and the accommodating housing.

14. The pump array according claim 2, wherein the assembly structure forms a cover which closes off the accommodating space, and/or an annular gasket which seals off the accommodating space from the outside is arranged between the assembly structure and the accommodating housing.

15. The pump array according to claim 2, wherein the assembly structure is flange-mounted to the accommodating housing.

16. The pump array according to claim 2, wherein the assembly structure, comprises a motor space outlet which connects a motor space, which is surrounded by the stator on the circumferential side, in fluid communication with the accommodating space.

17. The pump array according to claim 16, wherein the motor space outlet is arranged laterally on the pump insert, or the motor space outlet emerges onto the outer side of the assembly structure via an opening of the motor space outlet pointed towards the circumferential wall.

18. The pump array according to claim 1, wherein the accommodating housing comprises a discharge channel which emerges into the accommodating space and via which fluid can be discharged from the accommodating space or a storage container.

19. The pump array according to claim 1, wherein the accommodating space is sealed off in relation to the inlet and the outlet.

20. The pump array according to claim 1, wherein the stator forms at least a part of the outer circumference or the outer side of the pump insert and/or delineates the accommodating space.

21. The pump array according to claim 2, wherein at least one of the assembly structure and the accommodating housing is made of metal or a metal alloy.

22. The pump array according to claim 4, wherein the thermally conductive element comprises a thermally conductive paste or a thermally conductive pad.

23. The pump array according to claim 5, wherein the carrier comprises a printed circuit board.

24. The pump array according to claim 6, wherein the electronics housing is made of plastic.

25. The pump array according to claim 15, wherein the assembly structure is fastened to the accommodating housing by means of at least one stud-bolt.

Description

(1) The invention has been described on the basis of multiple embodiments and examples. In the following, the invention is described on the basis of figures. The features thus disclosed, individually and in any combination of features, advantageously develop the invention. There is shown:

(2) FIG. 1 an exploded representation of a pump insert in accordance with the invention;

(3) FIG. 2 a perspective representation of the pump insert from FIG. 1;

(4) FIG. 3 a pump array comprising an accommodating housing with the pump insert according to FIGS. 1 and 2 inserted in it;

(5) FIG. 4 an assembly structure of the pump insert; and

(6) FIG. 5 a partial section of the assembly structure and the stator which shows a motor space outlet.

(7) The pump insert 1 shown in FIGS. 1 to 3 comprises a pump 10 and an electric motor 20 which is arranged on or fastened to the end-facing side of the pump 10 or a pump housing 18 of the pump 10. The pump 10 comprises a pump housing 18 which comprises: a housing base body 18b; a first housing cover 18a which is fastened to the end-facing side of the housing base body 18b; and another, second housing cover 18c. The housing cover 18c is attached to the end-facing side of the housing base body 18b which points towards the electric motor 20. The housing cover 18c is arranged between the electric motor 20, in particular a stator 22 of the electric motor 20, and the housing base body 18b. The housing cover 18a is attached on the other end-facing side of the housing base body 18b, i.e. the end-facing side facing away from the electric motor 20. In the example shown, the housing base body 18b is arranged between the housing covers 18a, 18b. As an alternative to the embodiment shown, either the housing cover 18a or the housing cover 18c can be formed in one part, i.e. monolithically, with the housing base body 18b. The housing covers 18a, 18b and the housing base body 18b can be centered or positioned correctly relative to each other by means of at least one centering pin 19.

(8) As can be seen for example from FIG. 3, the pump housing 18 forms a pump chamber 15 which comprises a cylindrical inner circumferential wall. The pump chamber 15 is axially delineated on one end-facing side by the housing cover 18a and on the other end-facing side by the housing cover 18c. A first delivery element 11 and a second delivery element 12 are arranged in the pump chamber 15. The first delivery element 11 is formed as an externally toothed wheel and is non-rotationally connected to a drive shaft 30, for example by means of a shaft-hub connection or an interference fit. The first delivery element 11 and the drive shaft 30 can rotate together about a rotational axis D relative to the housing 18. The first delivery element 11 forms a sealing gap with each of the housing cover 18a and the housing cover 18c.

(9) The second delivery element 12 is formed as an internally toothed wheel or ring gear having an internal toothed profile and is mounted such that it can rotate by the inner circumferential surface of the housing base body 18b. The second delivery element 12 can rotate about a rotational axis which is arranged offset in parallel with respect to the rotational axis D. The internal toothed profile of the second delivery element 12 is in meshing engagement with the external toothed profile of the first delivery element 11 at one point on the circumference. The external toothed profile of the first delivery element 11 comprises fewer teeth than the internal toothed profile of the second delivery element 12. The outer diameter of the first delivery element 11 is smaller than the inner diameter of the second delivery element 12. The rotational speed ratio between the first delivery element 11 and the second delivery element 12 is such that the first delivery element 11 rotates at a greater rotational speed around the rotational axis D than the second delivery element 12 rotates about its rotational axis which is offset in parallel with respect to the rotational axis D. The second delivery element 12 forms a sealing gap with each of the first housing cover 18a and the second housing cover 18c.

(10) The pump housing 18—as shown in this example, the housing cover 18a—forms an inlet 13, in particular an inlet channel, and an outlet 14, in particular an outlet channel. The inlet 13 is embodied such that fluid, in particular oil, can flow into the pump chamber 15. The outlet 14 is embodied such that fluid, in particular oil, which is delivered by the first and second delivery elements 11, 12 while the pump is in operation, is drained out of the pump chamber 15. The inlet 13 and the outlet 14 are each formed as a channel. An inlet opening 13a of the inlet 13 and an outlet opening 14a of the outlet 14 point towards the side of the housing cover 18a which points towards an end-facing wall 103 (FIG. 3) of an accommodating space 104. The pump insert 1 is at least partially arranged in the accommodating space 104 which forms the end-facing wall 103 and a circumferential wall 102. The accommodating space 104, which is in particular a cup-shaped accommodating space 104, is formed by an accommodating housing 100 (FIG. 3).

(11) The accommodating housing 100 comprises a feed channel 65, a feed channel opening of which emerges onto the end-facing wall 103. The accommodating housing 100 also comprises a drainage channel, a drainage channel opening of which opens onto the end-facing wall 103. The drainage channel is situated behind the feed channel 65 in the plane of projection in FIG. 3 and is therefore not visible, but is nonetheless provided. In the example shown, the feed channel opening and the inlet opening 13a point towards each other and lie opposite each other. The drainage channel opening and the outlet opening 14a point towards each other and lie opposite each other.

(12) The feed channel 65 is connected in fluid communication with the inlet 13 via a tubular connecting element 60 which is arranged between the feed channel 65 and the inlet 13. The drainage channel is connected in fluid communication with the outlet 14 by means of a tubular connecting element 70 which is arranged between the drainage channel and the outlet 14.

(13) As can be seen for example from FIG. 2, the connecting element 60 is inserted into the inlet 13, and the connecting element 70 is inserted into the outlet 14. The inlet 13 comprises an inner circumferential surface, and the connecting element 60 comprises an outer circumferential surface, wherein a sealing ring 61 is arranged between the inner circumferential surface and the outer circumferential surface and abuts them, forming a seal, in order to seal off the gap formed between them. This seals off the inlet 13 in relation to the accommodating space 104.

(14) The outlet 14 comprises an inner circumferential surface, and the connecting element 70 comprises an outer circumferential surface, wherein a sealing ring 71 is arranged between the inner circumferential surface and the outer circumferential surface and abuts them, forming a seal, in order to seal off the gap formed between them. This seals off the outlet 14 in relation to the accommodating space 104. A reflux valve which is formed in the outlet 14 comprises a closing body 73 which is spherical in the example shown (FIG. 1) and is embodied to allow a flow of fluid from the pump chamber 15 to the drainage channel, i.e. when the closing body 73 is lifted off a valve seat, and to block a flow in the opposite direction from the drainage channel into the pump chamber 15, i.e. when the closing body 73 abuts the valve seat.

(15) When the pump insert 1 is inserted into the accommodating space 104 (FIG. 3), the connecting element 60 is inserted into the feed channel 65 and the connecting element 70 is inserted into the drainage channel. The connecting elements 60, 70 each comprise an outer circumferential surface, and the feed channel 65 and the drainage channel each comprise an inner circumferential surface. The gap formed between the outer circumferential surface and the inner circumferential surface is sealed by a sealing ring 62, 72 (FIG. 1) in each case, such that the feed channel 65 and the drainage channel are sealed off in relation to each other and in relation to the accommodating space 104.

(16) The connecting element 60 and the connecting element 70 comprise a seat, which is shaped as an annular groove and forms the outer circumferential surface which the sealing ring abuts, for each of the sealing rings 61, 62 and/or 71, 72.

(17) The drive shaft 30 is mounted, such that it can rotate about the rotational axis D, by means of a first rotary bearing 16 and a second rotary bearing 17. The first rotary bearing 16 and the second rotary bearing 17 are each embodied as slide bearings in the example embodiment shown. The drive shaft 30 is supported on the housing cover 18a by means of the first rotary bearing 16 and on the housing cover 18c by means of the second rotary bearing 17, such that it can rotate about the rotational axis D. The housing cover 18a, 18c itself or a slide bearing bushing (not shown) which is attached, in particular press-fitted, in the housing cover 18a, 18c can for example form the rotary bearing 16, 17 which is embodied as a slide bearing.

(18) Optionally, a third rotary bearing 9 (FIG. 3) can be provided which is for example arranged such that a rotor 21 of the electric motor 20 is situated and/or arranged between the first rotary bearing 16 or the second rotary bearing 17 and the third rotary bearing 9. The third rotary bearing 9 can for example be embodied as a roll bearing or slide bearing. The drive shaft 30 is in particular supported at one end, such that it can rotate, on an assembly structure 25 via the third rotary bearing 9. In embodiments with no rotary bearing 9, the rotor 21 can be cantilevered, i.e. the rotor 21 is attached in a region of the drive shaft 30 which is arranged outside the first and second bearings 16, 17 and not between the first and second bearings 16, 17.

(19) The assembly structure 25 is connected to the pump housing 18, such that it is fixed against rotating about the rotational axis D and preferably also axially fixedly, namely by means of at least one connecting structure 26 (FIGS. 1 and 2) which is for example an elongated connecting structure. In the embodiments shown, the at least one elongated connecting structure 26 is embodied in the form of multiple stud-bolts. The connecting structure 26 extends parallel to the rotational axis D. The assembly structure 25 comprises a bore, in particular a threaded bore, in particular in the region of the circumference, for each connecting structure 26, into which an internal thread of the connecting structure 26 is screwed. The outer circumference of the stator 22 of the electric motor 20 comprises a passage or, as for example shown in FIGS. 1 and 2, a groove-shaped elongated recess for each of the connecting structures 26, wherein the connecting structure 26 extends through the groove-shaped recess in the longitudinal direction of the groove. This supports the stator 22, such that it is fixed against rotating about the rotational axis D, on the connecting structure 26. The pump housing 18, in particular the housing covers 18a, 18c and the housing base body 18b, comprise(s) a passage for each of the connecting structures 26, in which one of the connecting structures 26 is arranged. The housing cover 18a, the housing base body 18b, the housing cover 18c and the stator 22 are arranged and/or clamped between the assembly structure 25 and a head of the connecting structure 26 or a bolt nut which is screwed onto the connecting structure 26. In the embodiment shown in the figures, a first end-facing side of the stator 22 abuts the housing cover 18c, and a second end-facing side of the stator 22 abuts the assembly structure 25.

(20) The electric motor 20 comprises the stator 22, which is connected or coupled to the pump housing 18 and the assembly structure 25 such that it is fixed against rotating about the rotational axis D and axially fixedly, and the rotor 21 which is non-rotationally connected to the drive shaft 30, in particular in a non-rotational engagement with the drive shaft 30. In the example embodiment shown in the figures, the rotor 21 is embodied as an internal rotor. The rotor 21 is surrounded by the stator 22. Alternative arrangements of the rotor 21 and the stator 22 are however possible in principle; thus, the rotor 21 can for example be embodied as an external rotor, i.e. such that the rotor 21 at least partially surrounds the stator 22.

(21) The rotor 21 and the delivery element 11 are connected, in particular non-rotationally, via the drive shaft 30 in such a way that rotating the rotor 21 causes the delivery element 11 to rotate.

(22) The stator 22 comprises multiple coils 23 over its circumference, to which electrical energy can be selectively applied, for example in groups (phases), thus generating magnetic fields which cause the rotor 21 to be rotated relative to the stator 22 about the rotational axis D.

(23) The stator 22 encloses a motor space 52 of the electric motor 20, in which the rotor 21 is arranged. The stator 22 forms a part of the outer circumference or forms the outer side of the pump insert 1. In other words, the stator 22 delineates the accommodating space 104 in which the pump insert 1, in particular at least the pump 10 and the electric motor 20, is/are at least partially arranged.

(24) As can be seen from FIG. 3, the housing cover 18a is open towards the accommodating space 104 in the region of the rotary bearing 16, such that there is a direct fluid-communication connection between the rotary bearing 16 and the accommodating space 104. The rotary bearings 16, 17 are not completely liquid-tight, such that so-called leakage fluid (leakage liquid) can flow out of the pump chamber 15 via the rotary bearing 16 and the rotary bearing 17 during delivery operations of the pump 10. In the embodiment shown in FIG. 3, the leakage fluid flowing through the rotary bearing 16 can be discharged directly into the accommodating space 104. The leakage fluid flowing through the rotary bearing 17 is first guided into the motor space 52 and then discharged from the motor space 52 via a motor space outlet 53. The motor space 52 is thus provided in order for fluid, in particular the leakage liquid such as for example oil, to be able to flow through it. This enables the components arranged in the motor space 52 to be cooled and/or lubricated and alternatively or additionally enables the assembly structure 25 to be cooled. In the embodiment shown in the figures, the pump insert 1 is configured in such a way that the leakage fluid coming from the pump chamber 15 is channeled into the motor space 52 and in particular flows through the motor space 52 and is discharged from the motor space 52 into the accommodating space 104 via the motor space outlet 53.

(25) As shown in FIGS. 4 and 5, the motor space outlet 53 can for example be formed by the holding structure 25. The motor space outlet 53 is arranged laterally on the pump insert 1 (FIG. 5). A motor space outlet opening 53a points towards the circumferential wall 102 and emerges onto the outer circumference of the pump insert 1, in particular the outer circumference of the assembly structure 25.

(26) The pump array can be embodied such that the fluid can be discharged from the accommodating space 104 into a storage container, such as for example a liquid or oil reservoir which can for example be a gear sump. The storage container can for example be connected in fluid communication with the accommodating space 104. To this end, the accommodating housing 100 can comprise a discharge channel (not shown) which emerges into the accommodating space 104 and leads to the storage container. The pump 10 can for example suction the liquid or the oil from the storage container via the inlet 13 and the feed channel 65.

(27) As can be seen for example from FIG. 2, the pump insert 1 comprises a contact unit 40 which is arranged on the assembly structure 25, outside the accommodating space 104. The contact unit 40 comprises an electronics housing 41 which is fastened to the assembly structure 25 by means of multiple stud-bolts 46 (FIG. 1). A gasket 8 which is embodied as a sealing ring and arranged between the electronics housing 41 and the assembly structure 25 seals off an interior space in relation to the environment of the pump insert 1.

(28) The pump insert 1 comprises a plate-shaped carrier 42, in particular a printed circuit board, which comprises control electronics 49 for controlling the electric motor 20. The control electronics 49 and/or the carrier 42 are arranged on the side of the assembly structure 25 facing away from the electric motor 20. The carrier 42 comprising the control electronics 49 is arranged in the interior space enclosed by the electronics housing 41 and the assembly structure 25.

(29) In the example shown, the assembly structure 25 is formed from metal or a metal alloy, such as for example an aluminum alloy. A transmission of heat from the control electronics 49 to the assembly structure 25 is enabled by a thermal bridge formed between the assembly structure 25 and the control electronics 49 or individual components of the control electronics 49. The thermal bridge can be established by the carrier 42, and/or individual electronic components which require cooling during operation, abutting a surface of the assembly structure 25 which is formed from metal or a metal alloy. This enables thermal energy to be discharged from the control electronics 49 or components of the control electronics 49 into the assembly structure 25.

(30) As can be seen from FIGS. 1 and 3, at least one thermally conductive element 44 can be arranged between the control electronics 49 or individual components of the control electronics 49, or between the carrier 42 and the assembly structure 25, in order to improve the transmission of heat from the control electronics 49 or components of the control electronics 49 into the assembly structure 25. The at least one thermally conductive element 44 can for example be thermally conductive paste or a thermally conductive pad. Multiple components of the control electronics 49 which are to be cooled can for example be connected to the assembly structure 25 by means of a common thermally conductive element 44 in order to form the thermal bridge. Alternatively or additionally, multiple thermally conductive elements 44 can be provided, wherein a thermally conductive element 44 which is assigned to an individual component can be provided for each of multiple components (see FIG. 1).

(31) As can for example be seen from FIGS. 1 and 3, the electronics housing 41 comprises one or more hold-down elements 45 which protrude from its inner end-facing wall and press the carrier 42 against or onto the assembly structure 25. This can increase or improve the transfer of heat between the control electronics 49 and the assembly structure 25.

(32) A thermal bridge is formed between the assembly structure 25 and the accommodating housing 100, via which heat can be transmitted from the assembly structure 25 into the accommodating housing 100. The assembly structure 25 comprises a flange which fastens the assembly structure 25 and therefore the pump insert 1 to the accommodating housing 100. The accommodating housing 100 comprises an assembly surface 101 which is in particular on an end-facing side and opposed by an end-facing side of the assembly structure 25 formed by the flange. The flange can be fastened to the accommodating housing 100 by means of one or more fastening means, for example stud-bolts, which tense the flange towards the accommodating housing 100. The assembly structure 25, in particular the flange of the assembly structure 25, can directly abut the accommodating housing 100. Alternatively, a thermally conductive element 105 can be arranged between the assembly structure 25, in particular the flange of the assembly structure 25, and the accommodating housing 100. The thermally conductive element 105 can in particular be thermally conductive paste or a thermally conductive pad. This improves or increases the transfer of heat between the assembly structure 25 and the accommodating housing 100.

(33) The thermal bridge formed between the assembly structure 25 of the pump insert 1 and the accommodating housing 100, the assembly structure 25 and the thermal bridge formed between the assembly structure 25 and the control electronics 49 embodied to control the motor 20 are adjusted to each other such that heat generated in the control electronics 49 while the electric motor 20 is in operation is at least mostly discharged into the accommodating housing 100 via the thermal bridge formed between the control electronics 49 and the assembly structure 25, the assembly structure 25 and the thermal bridge formed between the assembly structure 25 and the accommodating housing 100.

(34) The assembly structure 25 forms a cover which closes off the accommodating space 104. An annular gasket 7 which seals off the accommodating space 104 from the outside is arranged between the assembly structure 25 and the accommodating housing 100, in particular between the assembly surface 101 and the flange opposing the assembly surface 101 of the accommodating housing 100. The assembly structure 25 comprises a recess which is shaped as a groove, in particular an annular groove, and in which the annular gasket 7 is arranged. The annular gasket 7 abuts the annular groove on the one hand and the assembly surface 101 on the other, forming a seal, in order to seal off the accommodating space 104 in relation to the environment.

(35) The contact unit 40 or the control electronics 49 is/are connected in an electrically conductive way to, i.e. contact(s), the coils 23 of the stator 22. As can be seen for example from FIG. 3, the assembly structure 25 is arranged between the contact unit 40 and the rotor 21 and/or the stator 22. The assembly structure 25 comprises multiple passages 28 for one contact element 47, in particular a contact tongue, each. The passage 28 is formed by a sealing element 27, which can for example be a rubber gasket or a subsequently introduced sealing or potting compound. In the example shown in FIG. 3, each of the contact elements 47 formed on the stator 22 projects from the stator 22 towards the contact unit 40 and respectively extends through one of the passages 28. The contact unit 40, in particular the control electronics 49, comprise(s) multiple complementary contact elements 24, each of which is connected in an electrically conductively way to, i.e. contacts, a coil 23 or a group of coils 23. Each of the contact elements 47 extending through the passage 28 is assigned to one of the complementary contact elements 24, with which it forms a plug connection for electrically contacting the control electronics 49 or the contact unit 40 in general. The contact elements 47 and complementary contact elements 24 can for example be plugged together by attaching the assembly structure 25 together with the contact unit 40 on the stator 22, for example by affixing them in the axial direction along the rotational axis D. The contact elements 47 extend through the assembly structure 25, namely through the passages 28, wherein the complementary contact elements 24 are arranged on the side of the assembly structure 25 facing away from the electric motor 20, for example in the interior space enclosed by the electronics housing 41 and the assembly structure 25.

(36) Alternatively, the contact element 47 can be formed on the carrier 42 and protrude from the carrier 42 through the passage 28. The complementary contact elements 24 can be formed on the stator 22 and can electrically contact the contact element 47 on the side of the assembly structure 25 facing the stator 22.

(37) The contact unit 40 comprises at least one electrical plug connector 43. The at least one electrical plug connector 43 can be formed at least in part by the electronics housing 41 and/or serves to supply the control electronics 49 and/or the coils 23 with electrical energy. The electrical plug connector 43 is arranged outside the accommodating space 104.

LIST OF REFERENCE SIGNS

(38) 1 pump insert 7 gasket/sealing ring 8 gasket/sealing ring 9 third rotary bearing 10 pump 11 first delivery element/toothed wheel 12 second delivery element/internally toothed wheel 13 inlet 13a inlet opening 14 outlet 14a outlet opening 15 pump chamber 16 first rotary bearing/slide bearing 17 second rotary bearing/slide bearing 18 pump housing 18a first housing cover 18b housing base body 18c second housing cover 19 centering pin 20 electric motor 21 rotor 22 stator 23 coil 24 complementary contact element 25 assembly structure 25a contact surface 26 connecting structure 27 sealing element 28 passage 30 drive shaft 40 contact unit 41 electronics housing 42 carrier 43 electrical plug connector 44 thermally conductive element 45 hold-down element 46 stud bolt 47 contact element/contact tongue 49 control electronics 52 motor space 53 motor space outlet 53a motor space outlet opening 60 connecting element 61 sealing ring 62 sealing ring 65 feed channel 70 connecting element 71 sealing ring 72 sealing ring 73 closing body 100 accommodating housing 101 assembly surface 102 circumferential wall 103 end-facing wall 104 accommodating space 105 thermally conductive element D rotational axis