Pump arrangement

Abstract

A pump assembly includes an axial gap motor including a first stator, a motor rotor, and a motor shaft, and a first pump including a first pump rotor configured to be rotated by the motor rotor. The first stator includes a first yoke having an annular shape and a plurality of first teeth disposed on a first surface of the first yoke. The first pump is disposed within a first interior space surrounded by the plurality of first teeth.

Description

Technical field

[0001] The present disclosure relates to a pump arrangement. This application claims priority based on Japanese patent application No. 2022-202207, filed on December 19, 2022, and the entire contents of the Japanese patent application are incorporated herein by reference. State of the art

[0002] An axial-gap motor consists of a stator, a motor rotor, and a motor shaft. In this type of motor, the magnetic flux flows from the stator to the rotor parallel to the axis of the motor shaft. The advantage of an axial-gap motor is its shorter length along the shaft.

[0003] PTL 1 discloses a pump arrangement that combines an axial-gap motor and an electric pump for pumping a fluid. In this pump arrangement, the axial-gap motor and the electric pump are arranged side by side in one direction along the axis of a motor shaft. Such a pump arrangement is compact because it takes advantage of the small size of the axial-gap motor along the axis. In the pump arrangement with a radial-gap motor, the size of the motor shaft along the axis is large. List of oppositions patent literature

[0004] PTL 1: Unexamined Japanese patent application with publication number: 2020-182269 Summary of the invention

[0005] A pump arrangement of the present disclosure comprises an axially gapped motor comprising a first stator, a motor rotor, and a motor shaft, and a first pump comprising a first pump rotor configured to be rotated by the motor rotor. The first stator comprises a first bracket having an annular shape and a plurality of first teeth arranged on a first surface of the first bracket. The first pump is arranged in a first interior space surrounded by the plurality of first teeth. Brief description of the drawings Fig. Figure 1 is a schematic perspective view of a pump arrangement according to the first embodiment. Fig. Figure 2 is a schematic top view of a pump arrangement according to the first embodiment. Fig. Figure 3 is a schematic perspective exploded view of a motor with an axial gap, which is provided in a pump arrangement according to the first embodiment. Fig. Figure 4 is a schematic configuration view to illustrate the arrangement state of a first pump in a pump arrangement according to the first embodiment. Fig. Figure 5 is a cross-sectional view of the pump arrangement of the first embodiment, shown along the line shown in Fig. The work was carried out as shown in line VV 4. Fig. Figure 6 is a cross-sectional view of the pump arrangement of the first embodiment, shown along the line shown in Fig. The work was carried out as shown in line VI-VI 4. Fig. Figure 7 is a schematic configuration view to illustrate an arrangement state of a first pump in a pump arrangement according to the second embodiment. Fig. Figure 8 is a schematic cross-sectional view of a pump arrangement according to the third embodiment. Fig. Figure 9 is a schematic cross-sectional view of a pump arrangement according to the fourth embodiment. Detailed description [Problem to be solved from the present revelation]

[0006] The pump assembly can be located in a confined space, e.g., in a motor vehicle. Therefore, even when using the axial-gap motor, a pump assembly with a more compact length along the axis is required.

[0007] One objective of the present disclosure is to provide a pump arrangement that is more compact along the axis of the motor shaft than conventional pump arrangements. [Advantageous effects of the present disclosure]

[0008] The pump arrangement of the present disclosure is more compact than conventional pump arrangements. [Description of exemplary embodiments of the present disclosure]

[0009] First, the embodiments of the present disclosure are listed and described.

[0010] <1> A pump arrangement of the present disclosure comprises an axially gapped motor comprising a first stator, a motor rotor, and a motor shaft, and a first pump comprising a first pump rotor configured to be rotated by the motor rotor. The first stator comprises a first bracket having an annular shape and a plurality of first teeth arranged on a first surface of the first bracket. The first pump is arranged in a first interior space surrounded by the plurality of first teeth.

[0011] At the in <1> In the described pump arrangement, the first pump is located in the first interior space of the motor with an axial gap, surrounded by the multitude of first teeth. Therefore, the length of the motor shaft along the axis is... <1> The described pump arrangement is smaller than the length of the motor shaft along the axis in the conventional pump arrangement.

[0012] At the in <1> In the described pump arrangement, the first pump is located in the first interior space. That is, the first pump is positioned inside the motor with an axial gap and is surrounded by components of the motor with an axial gap. Therefore, it is unlikely that the operating noise of the first pump will penetrate to the outside of the pump arrangement. Therefore, the <1> The described pump arrangement is particularly quiet.

[0013] At the in <1> In the described pump arrangement, the temperature of the first pump, located in the first chamber of the axial-gap motor, is likely to rise due to the heat generated by the axial-gap motor. As the temperature of the first pump increases, the temperature of the fluid within it rises, and the fluid's viscosity decreases. This reduces the load on the axial-gap motor and thus its power consumption. In particular, after the axial-gap motor starts, when the fluid temperature is low, the load on the motor is likely to be reduced early on. The first pump, located in the first chamber, has a high heat capacity due to its design. Therefore, it can easily absorb the heat generated by the axial-gap motor and suppress its heat generation.The fluid in the present disclosure can be a liquid, a gas or a mixture of a gas and a liquid.

[0014] <2> In the pump arrangement according to <1> The first pump rotor can be attached coaxially to the motor shaft.

[0015] At the in <2> In the described pump arrangement, the motor shaft of the motor rotor also serves as the drive shaft for the pump rotor. Therefore, the number of parts in the pump arrangement is reduced, and the pump arrangement is more compact. Since the first pump rotor rotates in perfect synchronization with the rotation of the motor rotor, the number of revolutions of the first pump rotor, i.e., the fluid flow rate, can be easily controlled by the axial-gap motor.

[0016] <3> In the pump arrangement according to <1> or <2> The first pump can have an inlet and an outlet. The inlet and outlet can be arranged in a first direction, viewed from the first pump rotor. This first direction is a direction along the axis of the motor shaft and away from the motor rotor.

[0017] Since the motor rotor is not oriented in the first direction relative to the first pump rotor, the inlet and outlet ports can be arranged simply. Furthermore, because the inlet and outlet ports are oriented in the first direction, an increase in the diameter of the stator core is suppressed.

[0018] In contrast to the one in <3> The described configuration, when the inlet and outlet ports are arranged radially, is positioned in a gap between a multitude of first teeth arranged in the first bracket and having an annular shape. The radial direction is perpendicular to the axis of the motor shaft and away from the axis. The radial arrangement of the inlet and outlet ports increases the distance between the multiple first teeth, thus likely increasing the diameter of the stator core.

[0019] <4> In the pump arrangement according to one of the points <1> until <3> The first pump can be an internal gear pump, comprising an external gear and an internal gear. The external gear can be the first pump rotor.

[0020] The internal gear pump, in which the external gear is located inside the internal gear, is compact. The internal gear pump can be easily installed in the first available space, even with size limitations. Furthermore, the internal gear pump is more space-saving than other pumps of the same size. Therefore, it is suitable for use in... <4> The described pump arrangement is compact and can easily increase the fluid flow rate.

[0021] <5> In the pump arrangement according to <4> The axial-gap motor may include a motor housing configured to accommodate the first stator and motor rotor. The internal gear pump may include a pump housing configured to accommodate the external gear and internal gear. The motor housing includes a base section to which the first bracket is attached. The pump housing includes a body, a pump cover, and a bolt.The body comprises a cylindrical section, a base section, and an annular flange section, wherein the cylindrical section is configured to cover an outer circumference of the internal gear, the base section is configured to seal a first end face of the cylindrical section, and the annular flange section extends from an outer circumferential face of the cylindrical section at a position near a second end face of the cylindrical section toward an outer surface of the cylindrical section. The pump cover is configured to seal an opening of the cylindrical section at the second end face. The bolt is configured to secure the pump cover to the annular flange section. The annular flange section forms the base section.

[0022] At the in <5> In the described configuration, the pump cover of the pump housing is attached to the annular flange section, which is connected to the pump housing body, by a bolt. Therefore, it is not necessary to provide a bolt hole for the bolt in the cylindrical section that covers the outer circumference of the internal gear. The cylindrical section, which does not require a bolt hole, can be made thin. The outer diameter of the cylindrical section can be reduced, or the inner diameter of the cylindrical section can be increased by the amount of the reduction in thickness. If the outer diameter of the cylindrical section is reduced without changing the inner diameter, the outer diameter of the pump assembly can be reduced without decreasing the capacity of the internal gear pump.If the inner diameter of the cylindrical section is increased without changing the outer diameter of the cylindrical section, the performance of the internal gear pump can be increased without increasing the outer diameter of the pump assembly.

[0023] <6> In the pump arrangement according to one of the points <1> until <3> The first pump can be a vane pump. The first pump rotor can comprise a variety of vanes.

[0024] The vane pump with its innovative rotor featuring multiple vanes is compact. It can be easily installed in confined spaces. Furthermore, the vane pump offers excellent sealing performance, enabling it to effortlessly pump gases, liquids, or gas / liquid mixtures.

[0025] <7> In the pump arrangement according to one of the points <1> until <6> The pump arrangement may further comprise a second pump, which includes a second pump rotor configured to be rotated by the motor rotor. The axial-gap motor may further comprise a second stator arranged such that the motor rotor is positioned between the first and second stators. The second stator comprises a second annular-shaped bracket with a plurality of second teeth arranged on a second surface of the second bracket. The second pump is located in a second interior space surrounded by the plurality of second teeth.

[0026] An axial-gap motor, in which a motor rotor is positioned between a first stator and a second stator, generates high torque. Such an axial-gap motor is called a single-rotor, double-stator axial-gap motor. The in <7> The pump arrangement described comprises a first pump and a second pump that are independent of each other. Therefore, the <7> The described pump arrangement, for example, pumps fluids from two independent systems under pressure. Furthermore, since the first pump and the second pump are each located in the first and second interior spaces of the motor with an axial gap, the... <7> The described pump arrangement is compact. [Details of the embodiments of the present disclosure]

[0027] Specific examples of the pump arrangement of the present disclosure are described below with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts. The size of the parts shown in the drawings serves to clarify the description and does not necessarily correspond to the actual size. The present invention is not limited to these examples but is defined by the scope of the claims and is intended to include all variations within the meaning and scope that correspond to the scope of the claims. <Erstes Ausführungsbeispiel>

[0028] The in the Fig. 1 and Fig. The pump arrangement 1 shown in Figure 2 comprises a motor with an axial gap 2 and a first pump 5. A motor housing 29 of the motor with axial gap 2 and a pump housing 59 of the first pump 5 are visible from the outside of the pump arrangement 1. An inlet opening 51 and an outlet opening 52 are open in the pump housing 59. As shown in the top view of Fig. As shown in Figure 2, behind the inlet opening 51 and the outlet opening 52, an external gear 55 and an internal gear 56 can be seen, which are provided in the first pump 5 and which will be described later. Each configuration of the pump arrangement 1 is described below. In the following description, the "motor with axial gap" is simply referred to as the "motor". < <motor>>

[0029] The description of engine 2 focuses mainly on Fig. 3 referenced, which shows a perspective exploded view of engine 2, and Fig. 5 and Fig. Figure 6, which shows cross-sectional views of the pump assembly 1, will be referred to as needed. The motor 2 comprises a first stator 4, a motor rotor 3, and a motor shaft 20. As shown in Fig. 5 and Fig. As shown in Figure 6, the first stator 4 and the motor rotor 3 are arranged coaxially with the motor shaft 20. The first stator 4 and the motor rotor 3 are positioned opposite each other with a gap between them in one direction along the axis of the motor shaft 20. The motor 2 of the present embodiment is a single-rotor and single-stator motor comprising a first stator 4 and a motor rotor 3.

[0030] The first stator 4 comprises a first bracket 40, a plurality of first teeth 41, and a plurality of first coils 42. The first bracket 40 is an annular plate element. The first teeth 41 are columnar bodies. The first teeth 41 project from a first surface 40s of the first bracket 40, which has a planar shape. The plurality of the first teeth 41 have the same shape and size. The shape of each first tooth 41 is, for example, a prismatic shape or a cylindrical shape. The first stator 4 of the present embodiment is, for example, formed by an integrated powder compact. In a modification of the present embodiment, the first stator 4 can consist of a plurality of subdivided parts.

[0031] The end face of the first teeth 41 faces a magnet 31 of the motor rotor 3, which will be described later. The first coil 42 is arranged on the outer circumferential surface of the first teeth 41. When current flows through the first coil 42, the first stator 4 is energized, and a rotating magnetic field is generated. In the present embodiment, the end sections of the winding that form the first coil 42 are not shown.

[0032] The motor rotor 3 comprises a base plate 30 and a plurality of magnets 31. The base plate 30 is a circular plate element through which the motor shaft 20 passes. The base plate 30 and the motor shaft 20 are attached to one another, and the base plate 30 and the motor shaft 20 rotate coaxially with each other. The base plate 30 comprises a base surface 30s which faces the first surface 40s of the first bracket 40.

[0033] The multiple magnets 31 are attached to the base surface 30s, for example, with an adhesive. The magnet 31 is a permanent magnet. The multiple magnets 31 are arranged at substantially equal intervals around the axis of the motor shaft 20. The magnet 31 has, for example, the shape of a flat plate. The flat shape of the magnet 31 corresponds, for example, to the shape of the end face of the first teeth 41. The magnet 31 is magnetized in one direction along the axis of the motor shaft 20. The magnetization directions of two magnets 31 adjacent to each other around the axis of the motor shaft 20 are opposite to each other. The rotating magnetic field generated by the first stator 4 attracts or repulses the magnet 31 from the first teeth 41, causing the motor rotor 3 to rotate relative to the first stator 4.

[0034] As in Fig. As shown in Figure 5, the motor 2 also includes a motor housing 29. The first stator 4 and the motor rotor 3 are arranged inside the motor housing 29. Part of the motor shaft 20 is also arranged inside the motor housing 29. In a variation of the present embodiment, the entire motor shaft 20 can be arranged inside the motor housing 29.

[0035] The motor housing 29 of the present embodiment consists of a circumferential wall section 2A, a first cover 2B, and a second cover 2C. The circumferential wall section 2A is a cylindrical element. The inner diameter of the circumferential wall section 2A is larger than the outer diameter of the first stator 4. The length of the circumferential wall section 2A along the motor shaft 20 is greater than the length of the first stator 4 along the motor shaft 20.

[0036] The first cover 2B is a disc-shaped element that seals a first end section of the circumferential wall section 2A. The first cover 2B is a component independent of the circumferential wall section 2A. The first end section is an end section of the first stator 4 that adjoins the first bracket 40. The first bracket 40 is attached to the first cover 2B. That is, the first cover 2B acts as a base section 2Bb to which the first stator 4 is attached. Part of the first cover 2B in the present embodiment forms a first cover 5B of the pump housing 59 described later. The first cover 2B is provided with a flange at the edge of its outer circumference. The projecting height of the pump housing 59 is equal to or less than the end face of the flange. Therefore, the projecting part of the pump housing 59 is accommodated in a recess formed inside the flange of the first cover 2B.

[0037] The second cover 2C is a circular element that seals a second end section of the circumferential wall section 2A. This second end section is opposite the first end section. The second cover 2C can be a component independent of the circumferential wall section 2A or integrated into it. In the present embodiment, the circumferential wall section 2A and the second cover 2C are connected by fitting the second cover 2C, which was manufactured separately from the circumferential wall section 2A, into the circumferential wall section 2A. Therefore, the motor shaft 20 passes through the second cover 2C. A bearing 25 is arranged between the second cover 2C and the motor shaft 20, and the motor shaft 20 is rotatably mounted through the second cover 2C. A sealing element to prevent fluid from escaping the motor housing 29 can be located at the position of the bearing 25.As a modification of the present embodiment, if the entire motor shaft 20 is arranged in the motor housing 29, the inner surface of the second cover 2C includes a recess into which the end section of the motor shaft 20 is fitted. <<Erste Pumpe> >

[0038] The first pump 5 is mainly used in relation to the Fig. 4 to 6 described. Fig. Figure 4 is a view illustrating the arrangement state of the first pump 5 in the pump arrangement 1, where some parts of the pump arrangement 1 are omitted or simplified. For example, in Fig. 4 The first cover 2B of the motor housing 29 and the motor rotor 3 are not shown. In Fig. 4 will be the first lid 5B ( Fig. 5 and Fig. 6) of the pump housing 59 described later is omitted, and a state is shown in which the interior of the first pump 5 is exposed. In Fig. Figure 4 represents the first stator 4, the inlet opening 51 and the outlet opening 52 by two catenary lines.

[0039] The first pump 5 serves to pump the fluid. In this embodiment, the fluid is a liquid. For example, the fluid is machine oil. The first pump 5 comprises a first pump rotor 50, which is configured to be rotated by the motor rotor 3. The first pump 5 is arranged in a first interior space 21, which is surrounded by the plurality of first teeth 41.

[0040] The first pump 5 of the present embodiment is an internal gear pump with an external gear 55 and an internal gear 56. The external gear 55 is a disk-shaped gear with teeth on its outer circumference. The tooth profile of the external gear 55 is, for example, formed by a trochoidal curve. The internal gear 56 is a circular gear with teeth on its inner circumference. The external gear 55 is arranged inside the internal gear 56, and the teeth of the external gear 55 and the teeth of the internal gear 56 mesh with each other. In this internal gear pump, the external gear 55 is the first pump rotor 50.

[0041] The outer gear 55 and the inner gear 56 are arranged in the pump housing 59. As shown in the Fig. 5 and Fig. As shown in Figure 6, the pump housing 59 of the present embodiment consists of a circumferential wall section 5A, a first cover 5B, and a second cover 5C. The circumferential wall section 5A is a tubular element. As shown in Figure 6, the pump housing 59 consists of a circumferential wall section 5A, a first cover 5B, and a second cover 5C. The circumferential wall section 5A is a tubular element. Fig. As shown in Figure 4, the outer circumferential contour of the circumferential wall section 5A, viewed from the direction along the axis of the circumferential wall section 5A, has the shape of a circle partially intersected by a straight line. A portion of a screw hole 9h, described later, is formed in the circumferential wall section 5A. The center of the circular arc of the outer circumferential contour is located in Fig. 4 is displaced from the center of the motor housing 29 to the upper side and coincides with the pivot point of the internal gear 56 described later. Since the circumferential wall section 5A is cut, the pump housing 59 can be arranged in the first interior space 21, ensuring the rigidity of the pump housing 59. In a modification of the present embodiment, the midpoint of the arc of the outer circumferential contour of the circumferential wall section 5A may not coincide with the center of rotation of the internal gear 56. The midpoint of the arc of the outer circumferential contour of the circumferential wall section 5A may or may not coincide with the pivot point of the external gear 55.

[0042] The inner circumferential contour line of the circumferential wall section 5A is circular when viewed from the direction along the axis of the circumferential wall section 5A. The inner diameter of the circumferential wall section 5A is slightly larger than the outer diameter of the internal gear 56. Therefore, the internal gear 56 can rotate while its outer circumferential surface is in contact with the inner circumferential surface of the circumferential wall section 5A. The axis of rotation of the internal gear 56 is stabilized by being supported by the inner circumferential surface of the circumferential wall section 5A.

[0043] As in Fig. As shown in Figure 5, the first cover 5B is a plate-shaped element that seals the first end section of the circumferential wall section 5A. In the present embodiment, the first cover 5B is a component independent of the circumferential wall section 5A. As a variation of the present embodiment, the first cover 5B can be a component integrated into the circumferential wall section 5A. The first cover 5B can also be a component integrated into the first cover 2B of the motor housing 29. In the present embodiment, the first cover 5B is fitted into a through-hole in the annular base section 2Bb, which forms part of the first cover 2B of the motor housing 29. That is, the first cover 5B and the base section 2Bb, into which the first cover 5B is inserted, form the first cover 2B of the motor housing 29. The first cover 5B is provided with through holes that form the inlet opening 51 and the outlet opening 52.A recess is formed on the inner surface of the first cover 5B. An end section of the motor shaft 20 is rotatably mounted in the recess.

[0044] The second cover 5C is a plate-shaped element that seals the second end section of the circumferential wall section 5A. In this embodiment, the second cover 5C is a component independent of the circumferential wall section 5A. As a variation of this embodiment, the second cover 5C can be a component integrated into the circumferential wall section 5A. The second end section is an end section opposite the first end section. A recess 5D is formed in a surface of the second cover 5C facing the first pump rotor 50. In this embodiment, there are two recesses 5D. Two recesses 5D are provided at positions facing each other via the motor shaft 20. Each recess 5D has a substantially arcuate shape when viewed from the direction along the axis of the motor shaft 20. The two recesses 5D can be of different or identical shapes.The recess 5D reduces the sliding surface between the outer gear 55 and the second cover 5C, as well as the sliding surface between the inner gear 56 and the second cover 5C, thereby reducing the torque loss of the first pump 5. The motor shaft 20 passes through the second cover 5C. A bearing 26 is located between the motor shaft 20 and the through-bore through which the motor shaft 20 passes. Therefore, the motor shaft 20 is rotatably mounted in the second cover 5C. A sealing element to prevent fluid from escaping the pump housing 59 can be located at the position of the bearing 26.

[0045] As in Fig. As shown in Figure 6, in the present embodiment, the circumferential wall section 5A, the first cover 5B, and the second cover 5C are connected by a bolt 9. The bolt hole 9h, in which the bolt 9 is arranged, extends from the first cover 5B to the second cover 5C through the circumferential wall section 5A. As shown in Figure 6, the circumferential wall section 5A is connected by a bolt 9. Fig. As shown in Figure 4, the number of screw holes 9h in the present embodiment is three. Three bolt holes 9h are arranged at equal intervals so that they surround the internal gear 56.

[0046] As in Fig. As shown in Figure 6, the screw 9 connects the first cover 5B, the circumferential wall section 5A, and the second cover 5C. The first cover 5B of the present embodiment is integrated into the first cover 2B of the motor housing 29. Therefore, the first cover 5B, the circumferential wall section 5A, and the second cover 5C are connected by the screw 9, so that the first end section of the circumferential wall section 2A of the motor housing 29 is sealed by the first cover 2B.

[0047] The bolt hole 9h of the present embodiment comprises a smaller-diameter section 95 in which a shank 90 of the bolt 9 is arranged, and a larger-diameter section 96 in which a head 91 of the bolt 9 is arranged. A threaded groove is formed in at least a portion of the smaller-diameter section 95, corresponding to the second cover 5C. A screw groove may be formed in at least a portion of a section of the smaller-diameter section 95, corresponding to the circumferential wall section 5A. The head 91 is stopped by abutting a step between the smaller-diameter section 95 and the larger-diameter section 96. The head 91 is housed in the larger-diameter section 96 and does not protrude from the end face of the first cover 5B. Therefore, the head 91 does not increase the axial dimension of the pump assembly 1. As shown in the Fig. 1 and Fig. As shown in Figure 2, a tool hole is formed in the end face of the head 91, into which a tool for turning the bolt 9 is inserted. The tool hole of the present embodiment has a hexagonal shape. The shape of the tool hole is not specifically limited.

[0048] As in Fig. As shown in Figure 4, the external gear 55 is coaxially mounted on the motor shaft 20. This means that the axis of rotation of the external gear 55 and the axis of rotation of the motor shaft 20 coincide. The axis of rotation of the external gear 55 also coincides with the axis of the motor housing 29. The external gear 55 rotates in perfect synchronization with the rotation of the motor rotor 3. Therefore, the rotational speed of the external gear 55 can be controlled by controlling the rotational speed of the motor rotor 3. The flow rate of the fluid pumped by the first pump 5 varies depending on the rotational speed of the external gear 55.

[0049] The axis of rotation of the internal gear 56, positioned through the circumferential wall section 5A of the pump housing 59, is shifted upwards in the drawing relative to the axis of rotation of the external gear 55. Therefore, the internal gear 56 rotates in accordance with the rotation of the external gear 55, and the gap between the external gear 55 and the internal gear 56 moves in the direction of rotation of the motor shaft 20. The inlet port 51 and the outlet port 52 are opened in a gap between the external gear 55 and the internal gear 56. Consequently, the fluid flowing from the inlet port 51 into the gap is conveyed in the direction of rotation of the motor shaft 20 and discharged from the first pump 5 through the outlet port 52.

[0050] The inlet opening 51 and the outlet opening 52 are arranged at substantially symmetrical positions, with the motor shaft 20 positioned between them. The inlet opening 51 and the outlet opening 52 are arranged in the first direction, viewed from the first pump rotor 50, i.e., the outer gear 55. The first direction is a direction along the axis of the motor shaft 20 and is a direction away from the motor rotor 3. In the present embodiment, the inlet opening 51 and the outlet opening 52 are formed in the first cover 5B, which is arranged in the first direction from the first pump rotor 50. The inlet opening 51 and the outlet opening 52 of the present embodiment extend in the first direction and open at the end face of the first cover 5B. As a variation of the present embodiment, the inlet opening 51 and the outlet opening 52 can, for example, be bent in an L-shape.In this case, the inlet opening 51 and the outlet opening 52 can be opened in a direction that intersects the first direction. Since the rotating motor rotor 3 is not present at the locations where the inlet opening 51 and the outlet opening 52 are arranged, the inlet opening 51 and the outlet opening 52 can be arranged simply.

[0051] As a variation of the present embodiment, the inlet opening 51 and the outlet opening 52 can extend in a radial direction. The radial direction is a direction orthogonal to the axis of the motor shaft 20 and a direction away from the axis of the motor shaft 20. In this case, the inlet opening 51 and the outlet opening 52 each extend between two adjacent first teeth 41 to the outside of the pump assembly 1.

[0052] In the pump arrangement 1 of the present embodiment, the first pump 5 is arranged in the first interior space 21 of the motor 2. This means that the length of the pump arrangement 1 of the present embodiment along the motor shaft 20 does not increase, even though the first pump 5 is provided. Such a compact pump arrangement 1 can easily be arranged in a confined space such as the interior of a motor vehicle.

[0053] The first pump 5 generates operating noise. This operating noise includes, for example, contact noise between the outer gear 55 and the inner gear 56, as well as a pulsation noise that occurs during fluid delivery. The outer gear 55 and the inner gear 56, which generate the operating noise, are enclosed within the pump housing 59. Furthermore, the first pump 5 is located inside the motor 2. Therefore, in this embodiment of the pump arrangement 1, it is unlikely that the operating noise of the first pump 5 will penetrate to the outside. The pump arrangement 1 of the present embodiment is particularly quiet.

[0054] Motor 2 generates heat during operation. The temperature of the first pump 5, located in the first chamber 21 of motor 2, is likely to rise due to the heat generated by motor 2. As the temperature of the first pump 5 increases, the temperature of the fluid within the first pump 5 also rises, and the fluid's viscosity decreases. Consequently, the load on motor 2 is reduced, and its power consumption decreases. Particularly after motor 2 starts, when the fluid temperature is low, the load on motor 2 can be easily reduced early on. Due to its design, the first pump 5, located in the first chamber 21, has a high heat capacity. Therefore, the first pump 5 readily absorbs the heat generated by motor 2 and can suppress its heat generation. <Zweites Ausführungsbeispiel>

[0055] The first pump 5 provided in the pump arrangement 1 is not limited to an internal gear pump. The first pump 5 can, for example, be an external gear pump, a vane pump, a diaphragm pump, a rotary vane pump, or a piston pump. In the second embodiment, the pump arrangement 1, which includes a rotary vane pump as the first pump 5, is described with reference to Fig. 7 described. The view of Fig. 7 is the same as the one from Fig. 4.

[0056] The vane pump comprises a first pump rotor 50 with a plurality of vanes 58. The vane 58 is configured to move forward and backward, for example, by a magnetic force or a centrifugal force. Viewed from the direction along the axis of the motor shaft 20, the shape of the inner circumferential surface of the pump housing 59, in which the first pump rotor 50 is housed, is essentially elliptical. As a modification of the present embodiment, the shape of the inner circumferential surface of the pump housing 59 can be circular. When the first pump rotor 50 rotates, the end portion of the vane 58 comes into contact with the inner circumferential surface of the pump housing 59, and the vane 58 moves forward or backward.The fluid is contained within the space enclosed by two adjacent vanes 58, 58, the inner circumferential surface of the pump housing 59, and the first pump rotor 50. As the first pump rotor 50 rotates, the fluid is conveyed in the direction of rotation. The vane pump exhibits excellent sealing performance and can therefore easily pump gases, liquids, or mixtures of gas and liquids.

[0057] The pump arrangement 1 of the present embodiment comprises two inlet openings 51 and two outlet openings 52. The inlet openings 51 and the outlet openings 52 are arranged alternately around the axis of the motor shaft 20. There can be one inlet port 51 and one outlet port 52. <Drittes Ausführungsbeispiel>

[0058] In the third embodiment, the pump arrangement 1, which comprises the motor 2 with single rotor and double stator, is described with reference to Fig. 8 described. The view of Fig. 8 is similar to the one from Fig. 5.

[0059] The motor 2 of the present embodiment further comprises a second stator 6, which encloses the motor rotor 3 between the first stator 4 and the second stator 6. The second stator 6 is configured in the same way as the first stator 4. That is, the second stator 6 comprises a second annular-shaped bracket 60, a plurality of second teeth 61, and a plurality of second coils 62. The second teeth 61 are arranged on a second surface 60s of the second bracket 60. The second surface 60s is a surface facing the first surface 40s of the first bracket 40. The end surface of the second teeth 61 has the same shape as the end surface of the first teeth 41 and faces the end surface of the first teeth 41. That is, the first stator 4 and the second stator 6 are arranged symmetrically with respect to the motor rotor 3.

[0060] The motor rotor 3 of the present embodiment also has the plurality of magnets 31 on the surface facing the second stator 6. In this embodiment, the magnet 31 can be embedded in the base plate 30. In this case, one magnet 31 corresponds to both the first stator 4 and the second stator 6.

[0061] Motor 2 with single rotor and double stator is generally more space-saving than motor 2 with single rotor and single stator.

[0062] The motor 2 has a second interior chamber 22, surrounded by a plurality of second teeth 61. A second pump 7 is arranged in the second interior chamber 22. That is, the first pump 5 and the second pump 7 are arranged symmetrically with respect to the motor rotor 3. The second pump 7 is independent of the first pump 5. The second pump 7 is configured in the same way as the first pump 5. That is, the second pump 7 is an internal gear pump with an external gear 75 and an internal gear 76. The external gear 75 is a second pump rotor 70, configured to be rotated by the motor rotor 3. In particular, the second pump rotor 70 is connected coaxially to the motor shaft 20. That is, the motor shaft 20 serves as the axis of rotation for the first pump rotor 50 and the second pump rotor 70. The external gear 75 and the internal gear 76 are arranged in a pump housing 79.In a variation of the present embodiment, the first pump 5 and the second pump 7 can be pump types other than the internal gear pump. The first pump 5 and the second pump 7 can be pumps of different types. For example, the first pump 5 can be an internal gear pump and the second pump 7 a vane pump.

[0063] An inlet port 71 and an outlet port 72 extend along the axis of the motor shaft 20. The opening of the inlet port 71 and the opening of the outlet port 72 are arranged at positions away from the motor rotor 3. Since the rotating motor rotor 3 is not present at the positions where the inlet port 71 and the outlet port 72 are located, the inlet port 71 and the outlet port 72 can be arranged simply.

[0064] The circumferential wall section 2A of the motor housing 29 is large enough to accommodate both the first pump 5 and the second pump 7. Therefore, the pump arrangement 1 of the present embodiment is compact despite having two pumps.

[0065] The first cover 2B of the motor housing 29 of the present embodiment is configured in the same way as the first cover 2B of the first embodiment. The second cover 2C of the motor housing 29 of the present embodiment has the same configuration as the first cover 2B. Although part of the pump housing 79 penetrates the second cover 2C, the pump housing 79 therefore does not project beyond the end face of the second cover 2C. In a modification of the present embodiment, the pump housing 59 can project from the end face of the first cover 2B, and the pump housing 79 can project from the end face of the second cover 2C.

[0066] The pump arrangement 1 of the present embodiment, which has the configuration described above, can pump fluids from two independent systems under pressure. <Viertes Ausführungsbeispiel>

[0067] In the fourth embodiment, the pump arrangement 1, in which the configurations of the motor housing 29 and the pump housing 59 differ from those of the first embodiment, is described with reference to Fig. 9 described. In the present embodiment, the configuration is the same as in the first embodiment, with the exception of the motor housing 29 and the pump housing 59.

[0068] Fig. Figure 9 is a cross-sectional view of the pump arrangement 1 of the present embodiment along a line corresponding to line VI-VI in Fig. 4 corresponds. The position of screw 9 is different in the present embodiment than in the first embodiment.

[0069] The pump housing 59 of the present embodiment comprises a body 8 and a pump cover 8C. The body 8 is a cylindrical component with a base, comprising a cylindrical section 80, a base section 81, and an annular flange section 82. Fig. Figure 9 shows the boundary between the cylindrical section 80 and the bottom section 81, as well as the boundary between the cylindrical section 80 and the annular flange section 82, represented by two catenary lines.

[0070] The cylindrical section 80 is a section that covers the outer circumference of the internal gear 56. That is, the cylindrical section 80 corresponds to the circumferential wall section 5A of the pump housing 59 in the first embodiment. The bottom section 81 is a section that seals the first end face of the cylindrical section 80 and faces the motor rotor 3. A through-hole is formed in the bottom section 81 through which the motor shaft 20 passes. That is, the bottom section 81 corresponds to the second cover 5C of the pump housing 59 in the first embodiment. The annular flange section 82 is a section that extends from the outer circumferential surface of the cylindrical section 80 at a point near the second end face to the outside of the cylindrical section 80. The second end face is an end face opposite the first end face.The outer surface of the cylindrical section 80 faces away from the central axis of the cylindrical section 80. The annular flange section 82 generally has a ring shape. The first bracket 40 of the first stator 4 is attached to the surface of the annular flange section 82 facing the motor rotor 3. That is, the annular flange section 82 corresponds to the base section 2Bb of the motor housing 29 in the first embodiment. The body 8, into which the cylindrical section 80, the base section 81, and the annular flange section 82 are integrated, is expected to contribute to a reduction in the number of assembly steps of the pump assembly 1 and to a reduction in the cost of the pump assembly 1 due to a reduction in the number of components.

[0071] The pump cover 8C closes an opening 80h that opens towards the second end face of the cylindrical section 80. The pump cover 8C corresponds to the first cover 5B of the pump housing 59 in the first embodiment. The outer diameter of the pump cover 8C is larger than the inner diameter of the opening 80h. In the first embodiment, the pump cover 8C and the annular flange section 82 correspond to the first cover 2B of the motor housing 29.

[0072] The pump cover 8C is fastened to the annular flange section 82 of the housing 8 by the screw 9. The bolt hole 9h, in which the bolt 9 is located, penetrates the pump cover 8C and reaches the annular flange section 82. That is, viewed in the direction of the shank 90 of the bolt 9, the shank 90 does not overlap the cylindrical section 80 of the housing 8, and the bolt hole 9h for arranging the bolt 9 is not formed in the cylindrical section 80. The cylindrical section 80 is thinner than the circumferential wall section 5A in the first embodiment by the amount of the missing bolt hole 9h. The outer diameter of the cylindrical section 80 can be reduced by the amount of the reduction in thickness of the cylindrical section 80 compared to the first embodiment.In this embodiment, if the outer diameter of the cylindrical section 80 is reduced without changing its inner diameter, the outer diameter of the pump assembly 1 can be reduced without reducing the capacity of the first pump 5. The outer diameter of the pump assembly 1 is a dimension of the pump assembly 1 in a direction orthogonal to the axis of the motor shaft 20.

[0073] The inner diameter of the cylindrical section 80 can be reduced by the amount of the reduction in the thickness of the cylindrical section 80 compared to the configuration of the first embodiment. For example, if the inner diameter of the cylindrical section 80 is increased in the embodiment without changing its outer diameter, the capacity of the first pump 5 can be increased without increasing the outer diameter of the pump assembly. Furthermore, the outer diameter of the cylindrical section 80 can be reduced and the inner diameter of the cylindrical section 80 increased in the configuration of the first embodiment.

[0074] In the configuration of the present embodiment, where the bolt 9 is connected to the annular flange section 82, the bolt 9 does not primarily obstruct the inlet opening 51 and the outlet opening 52. Therefore, the number and position of the bolts 9 are less restricted in the present embodiment than in the configuration of the first embodiment.

[0075] The configurations of the motor housing 29 and the pump housing 59, as shown in the fourth embodiment, can also be applied to the pump arrangement 1 with the motor 2 of the single rotor and double stator type, as shown in the third embodiment. Reference symbol list 1 Pump arrangement 2 Motors with axial gap, motor 20 Motor shaft 21 first interior 22 second interior 25, 26 storage 29 Engine housing 2A Perimeter wall section 2B first lid 2C second lid 2Bb basic section 3 Motor rotor 30 Base plate 30s base area 31 Magnet 4 first stator 40 first hanger, 40s first surface 41 first teeth, 42 first coil 5 first pump 50 first pump rotor 51 Entrance opening, 52 Outlet opening 55 Outer gear 56 Internal gear 58 wings 59 Pump housings 5A Perimeter wall section, , 5B first lid, 5C second lid 5D cutout 6 second stator 60 second hangers, 60s second surface 61 second teeth, 62 second coil 7 second pump 70 second pump rotor 71 Entrance opening, 72 Outlet opening 75 Outer gear, 76 Internal gear 79 Pump housings 8 bodies 80 cylindrical section, 81 floor section, 82 ring-shaped flange section 80h opening 8C Pump cover 9 bolts 9h bolt hole 90 wave 91 heads 95 Section with smaller diameter 96 Section with larger diameter QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2022-202207

[0001] JP 2020-182269

[0004] < / motor>

Claims

[1] Pump arrangement comprising: an axial-gap motor comprising a first stator, a motor rotor, and a motor shaft; and a first pump which has a first pump rotor configured to be rotated by the motor rotor, wherein the first stator comprises a first bow having an annular shape and a plurality of first teeth arranged on a first surface of the first bow, and wherein the first pump is arranged in a first interior space which is surrounded by the plurality of first teeth. [2] Pump arrangement according to claim 1, wherein the first pump rotor is attached coaxially to the motor shaft. [3] Pump arrangement according to claim 1 or claim 2, wherein the first pump has an inlet opening and an outlet opening, wherein the inlet opening and the outlet opening are arranged in a first direction, viewed from the first pump rotor, and where the first direction is a direction along an axis of the motor shaft and a direction away from the motor rotor. [4] Pump arrangement according to any one of claims 1 to 3, wherein the first pump is an internal gear pump comprising an external gear and an internal gear, and where the outer gear is the rotor of the first pump. [5] Pump arrangement according to claim 4, wherein the axially gap motor comprises a motor housing configured to accommodate the first stator and the motor rotor, wherein the internal gear pump includes a pump housing configured to accommodate the external gear and the internal gear, wherein the motor housing comprises a base section to which the first bracket is attached, wherein the pump housing comprises the following a body comprising a cylindrical section, a bottom section and an annular flange section, wherein the cylindrical section is configured to cover an outer circumference of the internal gear, wherein the bottom section is configured to seal a first end face of the cylindrical section, and wherein the annular flange section extends from an outer circumferential surface of the cylindrical section at a position near a second end face of the cylindrical section to an outside of the cylindrical section, a pump cover configured to seal an opening of the cylindrical section at the second end face, and a bolt configured to attach the pump cover to the annular flange section, wherein the annular flange section forms the base section. [6] Pump arrangement according to any one of claims 1 to 3, wherein the first pump is a vane pump and wherein the first pump rotor comprises a plurality of vanes. [7] The pump arrangement according to any one of claims 1 to 6, further comprising: a second pump comprising a second pump rotor configured to be rotated by the motor rotor, wherein the axial gap motor further comprises a second stator arranged such that the motor rotor is positioned between the first stator and the second stator, wherein the second stator comprises a second bracket having an annular shape and a plurality of second teeth arranged on a second surface of the second bracket, and wherein the second pump is arranged in a second interior space, which is surrounded by the multitude of second teeth.

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