Motor and pump having such motor

Abstract

A motor for a pump has a stator, a rotor having a front end and a rear end, and a rotor bearing assembly for the rotor having a rear bearing seat for the rear end of the rotor and a motor cover on the rear bearing seat. The motor cover is connected with the rear bearing seat in a form-locking manner through a latch connection with latch protrusions on the bearing seat and elastic latch arms on the motor cover, each elastic latch arm interacting with one of the latch protrusions as a latch connection, so as to prevent movement away from the motor in the axial direction of the motor. The resilient latch arm is integrally connected to the motor cover in a region spaced from a longitudinal central axis of the rotor by 70% to 90% of a radial extension of the motor cover, wherein the resilient latch arm is elongated and resiliently movable in at least one direction.

Description

Technical Field

[0001] The invention relates to a motor or electric motor, more particularly forming a structural unit with a pump component or pump for liquids, ie a liquid pump. Furthermore, the invention relates to a pump having such a motor. Background Art

[0002] Such a structural unit comprising a motor or an electric motor and a pump is known from the prior art, see for example CN105473868 A. In this prior art document, the electric motor forms a structural unit with the pump, wherein, for better integration, the motor can be provided not so much as an independently processable structural unit that can also be used for any desired other applications, but rather as a housing surrounding the motor or enclosing it externally, so as to form an integrated part of the entire structural unit. Summary of the invention

[0003] The object of the present invention is to provide a motor as described above and a corresponding entire pump having such a motor, which can solve the problems of the prior art and by means of which in particular the integration of the motor into the pump can be improved and a more favorable structure can be achieved with high motor functionality and safety.

[0004] This object is solved by a motor having the features of claim 1 and a pump having the features of claim 20 with such a motor as a structural unit. Advantageous and preferred embodiments of the invention are the subject matter of the further claims and are explained in more detail below. Some of the features are described only for the motor or only for the pump. Nevertheless, they are nevertheless intended to be applicable both by themselves and independently of one another to such a motor and to such a pump. The wording of the claims is incorporated into the content of the description by explicit reference.

[0005] The motor according to the invention has a stator, which in particular has a laminated stator core and a stator winding on the laminated stator core. In addition, the motor has a rotor, which comprises a front end and a rear end and a longitudinal center axis, which also corresponds to or defines the longitudinal center axis of the entire motor. The motor has a rotor bearing assembly for the rotor. The rotor bearing assembly in turn has a rear bearing seat for the rear end of the rotor, advantageously so that the rear bearing seat is completely arranged at the rear end of the rotor. The rear bearing seat can also overlap or cover the end of the rotor. It is also possible to provide a front bearing seat for the front end of the rotor, but this is not relevant here. The motor has a motor cover in the area of ​​the rear bearing seat, so that the motor cover covers or closes the motor including the rear bearing seat to the rear, as it were, or can form its rear end. The motor cover itself is not necessarily a load-bearing component, but closes the rear end of the motor against dirt; in the process, it can also assume other functions, as will be explained in more detail below. The motor cover can not only engage or cover the rear end of the motor as a kind of rear end face, but can also optionally form at least a part of the outer circumference of the motor or engage thereon.

[0006] According to the invention, the motor cover is connected at least to the rear bearing seat in a form-locking manner, in particular in such a way that it can be fastened and released without the use of tools. This form-locking connection is advantageously configured so that the motor cover is fixed against movement in the axial direction of the motor away from the pump or away from the front end of the rotor. The form-locking connection can be in the direct radially inward direction of the integral connection of the resilient latching arms to the motor cover. The purpose is simple, that is, to firmly fasten the motor cover, but to be easy to fasten and release. In this way, sufficient stability is advantageously provided, and the rear end of the motor is also covered, in particular there is also sufficient ventilation through the motor cover. For this purpose, known ventilation openings can be provided. The form-locking connection of the motor cover to the rear bearing seat is configured as a latching connection, in particular, as a form-locking latching connection. For this purpose, latching projections are formed on the rear bearing seat. These latching projections are advantageously configured for a latching holding action along the longitudinal center axis, in particular away from the pump or away from the front bearing seat. Therefore, the latching connection with the latching projections holds the motor cover on the motor. Therefore, the motor cover can be fixed in this direction.

[0007] Advantageously, at least two latching projections are formed on the bearing seat, so that at least two elongated, resilient, resilient latching arms are formed on the motor cover, each resilient latching arm interacting in a form-locking manner with a corresponding latching projection of the rear bearing seat as a latching connection, or resting thereon, via a latching end (i.e., the configuration of the end of the resilient latching arm provided for latching). While the resilient latching arms thus preferably form the resilient or movable part of the latching connection via their latching ends, the latching projections on the rear bearing seat can form the stationary part of the latching connection, and in particular the stationary part and the non-resilient or non-flexible part. When viewed in the radial direction, the resilient latching arms are here molded relatively far outwards on the motor cover, in other words, they are here integrally connected to the motor cover, in particular produced in one piece or as one component therewith. In this case, they are connected to the motor cover in a region which is spaced from the longitudinal center axis of the rotor by more than 50% of the radial extension of the motor cover. In certain cases, this may even be 70% or more, advantageously at most 90% of the radial extension of the motor cover. By attaching the resilient latch arms relatively far outwardly to the motor cover in this way, they can be as long as possible and thus as flexible as possible even when made of a material that is inherently strong. In this case, the elongated resilient latch arms can be resiliently movable in at least one direction, wherein they can produce a latch connection by this movability, or the latch ends of the resilient latch arms can be deflected when reaching the latch projections so that they can interact with these projections or engage behind them. This movability of the resilient latch arms or their latch ends can be implemented in various ways, as will be explained in detail below. They can move in a direction parallel to the longitudinal center axis or at right angles thereto, or move radially. It is also possible to combine the movability of at least two of these moving options or movability directions.

[0008] The invention thus provides an option for fastening the motor cover according to the invention to the rest of the motor, in particular to the rear bearing block, quickly and simply and in particular without the use of tools, i.e. by means of a latching connection. At the same time, the motor cover can also be released from the motor quickly and advantageously without the use of tools.

[0009] In one embodiment of the invention, all elastic latching arms can be constructed identically, which also applies to the corresponding latching projections. They are particularly advantageously regularly distributed around the rear bearing seat in the circumferential direction. In this way, a uniform tightening action of the motor cover can be achieved. Three elastic latching arms can be provided here, which are then each arranged at 120° to each other.

[0010] In one configuration of the invention, the positive locking latching connections can be formed in such a way that they automatically come into effect or occur when the motor cover is placed onto the motor and the rear bearing support or introduced onto the motor and the rear bearing support at the rear. For this purpose, projections, centering aids, etc. can be provided to precisely guide the movement of the motor cover onto the motor and / or the rear bearing support.

[0011] In another embodiment of the invention, it is provided that even after the motor cover has been introduced into its end position, the latching connection must be produced separately, in particular by pressing on or abutting against elastic latching arms. This will be explained below.

[0012] In a configuration of the present invention, it can be provided that each elastic latch arm extends substantially in one plane. Such a plane can extend parallel to the longitudinal center axis and / or the longitudinal center axis can be located in this plane. Then, the movability of the elastic latch arm and therefore also the movability of the latch end is provided substantially or at least also in a direction that is angled or right angles to the longitudinal center axis. Then, the movability of the latch end in the radial direction or away from the longitudinal center axis and away from the latch projection is only provided indirectly by rotation, rather than by any movement precisely in the radial direction. Then, when viewed from the back, the latch end can be said to be pushed aside laterally to produce and therefore also release the latch connection. For this reason, a continuous ramp or the like known per se can be provided, so that when the shape-locking latch connection is produced, this can be said to be automatically carried out, or when the shape-locking latch connection is produced manually, at least it is convenient to carry out. The advantage of this configuration of the elastic latch arm lies in the fact that they can then extend to a degree parallel to the longitudinal center axis, so that they can be very stable in this direction. They can then fasten the motor cover very securely to the bearing housing, or the latching connection can display a very high holding force, in particular due to the specific configuration of the elastic latching arms themselves. Here, the elastic latching arms are therefore relatively thin in the circumferential direction and at the same time relatively wide at least in sections in a direction parallel to the longitudinal center axis. In the widest area, their width may be between five and twenty times their thickness. In the narrowest area, in particular at or near the latching end, the width may correspond to the thickness or at most four times the thickness.

[0013] In another alternative configuration of the present invention, due to its structural configuration, the elastic latching arms can be moved parallel to the longitudinal center axis, in particular their latching ends can also be moved in a purely radial direction. For this purpose, they can be constructed to be relatively immovable or stable in a direction at right angles to the longitudinal center axis and at right angles to their own longitudinal extension, i.e., in a transverse direction. These elastic latching arms can be bent at least once from their integral connection with the motor cover, which, as mentioned above, is advantageously relatively far outward, until their free ends on which the latching ends are arranged. They are advantageously bent twice or three times. Preferably, repeated bends are formed, each in opposite directions, i.e., a simple S-shape or a double S-shape, so to speak. This S-shape or repeated bend enables the latching end to move only in the radial direction, and therefore to move away from the latching projection on the rear bearing seat when the latching connection is produced and also when the latching connection is released. In addition, the elastic latching arms can here protrude not too far from the plane of the motor cover extending at right angles to the longitudinal center axis, and can be said to basically cover the rear end of the motor. In this way, the structural height along the longitudinal center axis may possibly be smaller than in the above-described alternative configurations of the invention.

[0014] In an advantageous further development of the invention, in order to facilitate the production of the latching connection, a chamfer is provided at the free end of the resilient latching arm, which forms the latching end of the resilient latching arm. The chamfer makes it easier for the end of the resilient latching arm to deviate from the latching projection on the rear bearing seat and thus automatically produces a latching connection when the motor cover is introduced onto the motor or onto the rear bearing seat from the rear. As a result, the resilient latching arm does not particularly need to be deliberately moved to the side, thereby facilitating the assembly process. Such a chamfer can point away from the longitudinal center axis in the direction from the rear bearing seat toward the front bearing seat of the rotor, or it can point to the introduced motor cover. A similar corresponding chamfer can advantageously be provided on the latching projection on the rear bearing seat, so that the two chamfers interact when the latching end of the resilient latching arm is deflected.

[0015] In an advantageous further development of the invention, the width of each elastic latching arm can be reduced from its connection with the motor cover to the free end with the latching end. This can save a certain amount of material on the one hand. On the other hand, the movability or bendability of the elastic latching arm can be influenced or adjusted in this way, which is considered to be conducive to the production of the latching connection and, above all, to the retention of the motor cover on the motor. This change or reduction in width can make it possible for the two side edges of the elastic latching arm to extend approximately in the radial direction and point to the longitudinal center axis in the above-mentioned second configuration of the invention. Since the elastic latching arm has a smaller width close to its ends, sufficient space is also reserved in the central area of ​​the motor cover to maintain the overall connection, so that the motor cover is also stable in this area. In this area, it can also be provided that the motor cover is placed directly on the bearing seat at the rear for greater overall stability, i.e. it is not connected to the rear bearing seat only by the latching connection itself.

[0016] In the above-mentioned first alternative for the construction of the resilient latching arm, which extends, so to speak, in a plane through which the longitudinal center axis passes, the reduction in width from radially outward to radially inward can achieve the goal that generally there is more construction space in the radially outer region than in the radially inner region. The reason for this is primarily that the rear bearing seat generally forms the rearmost region of the motor and a further extension of the construction length of the motor in this direction would be undesirable. In this way, in each case, good use is made of the available construction space to construct the resilient latching arm so that it is as stable as possible along the longitudinal center axis, since the resilient latching arm is intended to hold the motor cover as firmly as possible on the motor by means of the latching connection in exactly this direction.

[0017] In general, it can be provided that the width of the resilient latching arm decreases approximately uniformly, in particular that the width decreases continuously or strictly monotonically continuously.

[0018] In an advantageous further development of the invention, provision can be made that a protruding projection is formed on each free end of each resilient latching arm, which projection projects outwards or rearwards and can be used as a manual handle for manually releasing the latching connection. The latching connection can thus be released quickly and even without the need for simple tools such as, for example, a screwdriver. Such a projection can protrude from the resilient latching arm approximately parallel to the longitudinal center axis and / or extend approximately at right angles to the direction in which the latching end is moved to release the latching connection.

[0019] One configuration of the latching projections on the bearing seat can be such that they protrude radially by between 1% and 20%, in particular by a length of at most 10%, of the diameter of the rear bearing seat. This not only achieves a stable latching connection but also, at the same time, a less cumbersome dimensioning of the latching projections. If it can advantageously be ensured that the elastic latching arms, in particular in the above-mentioned second alternative configuration with a plurality of bends in their profile, exert radial pressure towards the longitudinal center axis, they may make it more difficult for the latching connection to be released spontaneously. Therefore, the overlap of the latching projections and the latching ends of the elastic latching arms does not have to be too great to prevent this.

[0020] In another advantageous configuration of the invention, it can be provided that at least one retaining bolt, advantageously at least two retaining bolts, protrude from the motor cover. The retaining bolt points from the motor cover to the front end of the rotor and extends approximately or exactly parallel to the longitudinal center axis. These retaining bolts can be used to prevent the motor cover from rotating about the longitudinal center axis or moving at right angles thereto. This can also ensure that the motor cover can only be moved out of the end position in the common structural unit away from the motor along the longitudinal center axis, and then only the latching connection is sufficient to prevent this. Such a retaining bolt or advantageously all retaining bolts can engage in a recess in the stator, in particular as a hole in the laminated stator core. In addition, the length of at least one retaining bolt can be configured so that the retaining bolt first engages in the recess and only then the latching connection is produced, or only then the latching end of the elastic latching arm moves onto the latching projection or comes into contact with the latter, possibly also with the corresponding bevel. The great advantage of this is that when the latching connection is produced, an accurate guided movement of the motor cover relative to the motor is produced or has already occurred, thereby achieving or facilitating the accurate production of the latching connection described. Such a retaining bolt and the corresponding recess can be provided with an insertion bevel or the like, or have a conical configuration for easier insertion. This is known from the prior art in connection with centering stakes or the like.

[0021] In an advantageous configuration of the invention, the motor cover completely covers the rear bearing seat. Furthermore, it covers the rear axial end of the motor. It advantageously engages on a part of the motor or the stator or its laminated stator core, with the stator winding facing outwards. One option is that it engages completely thereon, so that the best possible electrical insulation is achieved. Optionally, it can leave at least half, advantageously at most 80% or at most 90%, of the laminated stator core exposed to the outside. Then, cooling thereof by the ambient air can be improved, in order to reduce or prevent overheating of the motor during operation.

[0022] In a possible further development of the invention, in particular in the second alternative for the construction of the elastic latching arms, it can be provided that, although the motor cover is moved into the end position when introduced from the rear, in particular also by the above-mentioned advantageous retaining bolts engaging in the recesses in the stator, the latching connections are not yet produced or not yet completely produced. They then additionally have to be produced manually by pressing the elastic latching arms, in particular in the region of their latching ends, in the axial and / or radial direction of the rotor. Of course, this requires slightly more work when assembling the motor, but at the same time, the construction or strength of the elastic latching arms can then be improved, depending on the circumstances.

[0023] As an alternative to the above-described configuration of the retaining bolts in which they engage in recesses in the stator, the outer edge of the motor cover can also engage completely on the stator, so that this is only possible in a single, precisely defined position. This also results in a rotationally fixed fixation, for example in the case of a generally rectangular or square outer stator shape.

[0024] The elastic latch arm can be constructed so that, starting from its integral connection with the motor cover, it first extends in a precise radial direction, then bends towards the front end of the rotor with a bend of, in particular, about 90°, wherein it then bends towards the longitudinal center axis with a further bend of, in particular, about 90° again and with a larger radius. In another configuration, after the last bend, the elastic latch arm can be bent again by about 90°, so that it then points in a direction approximately parallel to the longitudinal center axis and away from the rotor. The latch end on the elastic latch arm can be arranged adjacent to it, preferably again with a bend of about 90° towards the longitudinal center axis, so that the latch end points to the longitudinal center axis, preferably approximately at right angles thereto. Thus, the latch end points in the same direction as the starting point of the profile of the elastic latch arm at the connection point with the motor cover, with a wide arc-shaped bend therebetween, advantageously into the motor or towards the front end of the rotor. This curved profile brings about the mobility or bendability of the elastic latch arm according to the invention.

[0025] In another configuration of the invention, the elastic latching arm can be configured so that, in the basic position in which the motor cover has not yet been placed on the motor and the elastic latching arm has not yet been force-loaded or buckled, there is a distance between the latching end and the latching projection, which is directed away in the direction of the longitudinal center axis. Such a distance can preferably be 0.2 cm to 2 cm or 2% to 30% of the length of the elastic latching arm. In this configuration of the motor cover, as soon as the motor cover is placed on the rear end of the motor, each latching connection must be produced, preferably by manually pressing on the elastic latching arm, in particular in the area of ​​the latching end, possibly by pressing on the protruding projection described above. However, it can thus be ensured that the elastic latching arm holds the motor cover on the motor under preload and thus has a significant holding force.

[0026] The pump according to the invention has a pump element and the above-described motor, wherein the motor is arranged on the pump element and fastened to the pump element in such a way that the motor and the pump element form the pump as a structural unit. The motor forms the drive for the pump element or, if the pump is designed as an impeller pump, the drive for the impeller arranged therein.

[0027] These and further features are disclosed in the description and in the drawings as well as in the claims, wherein, in one embodiment of the invention and in other fields, the individual features can be realized individually or multiple times in subcombinations and can represent per se advantageous and protectable embodiments, for which protection is claimed here. The subdivision of the application into individual sections and subheadings does not limit the general validity of the statements made according to the application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Exemplary embodiments of the invention are schematically illustrated in the drawings and are explained in more detail below. In the drawings:

[0029] Figure 1 is a perspective view of a structural unit of a pump according to the present invention, the structural unit having a pump component according to the present invention and a motor,

[0030] Figure 2 is a rear view of the pump with the motor and motor cover,

[0031] Figure 3 is a cross-sectional view through a motor according to the invention with a motor cover,

[0032] Figure 4 Shows from Figure 3 The angle passes through another section of the motor cover,

[0033] Figure 5 is a rear view of an alternative motor cover having a differently configured resilient latch arm, Figure 6 Shows Figure 5 A magnified portion of FIG. 1 shows the movement of one of the resilient latch arms.

[0034] Figure 7 It passes through Figure 5 A transverse cross-sectional view of the motor cover, and

[0035] Figure 8 is a further representation of the movement of the resilient latch arm. DETAILED DESCRIPTION

[0036] Figure 1A pump 11 according to the invention is shown as a structural unit together with a motor 13 which is mounted at the rear to a pump component 60 so that the two form a structural unit 11. The pump component 60 is constructed essentially as known in the prior art, for example from the above-mentioned CN 105473868A. It has a pump housing 61 with an inlet 62 into a pump chamber 63. An impeller 66 rotates therein and conveys water through the pump chamber 63 as far as an outlet 64. The pump is therefore an impeller pump. A heating element can be arranged in the pump chamber 63, but this is not important here.

[0037] The motor 13 has a stator 15 with a laminated stator core 17, see also Figure 3 and Figure 4 In the substantially square laminated stator core 17 with oblique angles, retaining recesses 18 in the form of through holes or through-drilled holes are provided in the corner regions, the function of which will be explained in more detail below. Figure 3 and Figure 4 The stator windings 19 are shown attached to winding holders 20. These winding holders 20 are in turn connected to the laminated stator core 17. The stator windings 19 are arranged relatively closely around the housing 30b of the motor 13.

[0038] The rotor 28 with a through-rotor shaft is arranged in the housing 30b. The rotor shaft has a rear axial end 27, which is arranged in a rear bearing seat 30a via a bearing 31. The rear bearing seat 30a is part of the housing 30b. It can be roughly cup-shaped, with a rear receiving cup 32. As mentioned above, three latching projections 34 are arranged regularly distributed circumferentially around the receiving cup 32. The latching projections 34 have rearward and inclined radially outward bevels 35. At the front, they are flattened in the radial direction to achieve the best possible latching action.

[0039] The flat motor cover 38 is placed onto the motor 13 from the rear and thus overlaps with or forms the rear side of the motor 13. The motor cover 38 thus consists of a rear side 40 which extends substantially in a plane perpendicular to the longitudinal center axis of the rotor 28. Furthermore, the motor cover 38 has an outer frame 50 or the rear side 40 is directly incorporated into the outer frame 50. Figure 2 The outer frame 50 extends in a generally square shape, has notches in the corner areas, and overlaps the portion of the stator winding 19 that protrudes rearwardly below the laminated stator core 17. In addition, the outer frame 50 also engages a small amount with the front edge on the laminated stator core 17. Figure 4The retaining pegs 52 of the molded motor cover 38 engage in the above-mentioned retaining recesses 18. The shown conical configuration of the retaining pegs 52 facilitates insertion. This ensures precise positioning and, most importantly, anti-rotational fixation, and also prevents any movement in a direction perpendicular to the longitudinal center axis of the rotor 28. Additionally or alternatively, this can also be achieved by the front edge of the outer frame 50 engaging on the laminated stator core 17 or the winding holder 20.

[0040] according to Figure 1 , a socket housing 53 is molded onto the motor cover 38 or onto the outer frame 50, wherein a socket 54 is provided for the electrical connection of the motor 13 or the entire structural unit 11. If the pump 60 has the above-mentioned heating element, its electrical connection can also advantageously be carried out via the socket 54.

[0041] Although the retaining bolts 52 in the retaining recesses 18 of the laminated stator core 17 prevent the motor cover 38 from twisting or moving on the motor 13, a positive locking latch connection according to the invention is still required to prevent the motor cover 38 from being removed from the motor along the longitudinal center axis. For this purpose, the motor cover 38 has three elastic latch arms 42a, 42b and 42c on the rear side 40. These are separated from each other by respective ventilation slots 41. From Figure 2 It is clear from the figure that the elastic latching arms 42a to 42c and the ventilation slot 41 extend or are configured, so to speak, precisely in the radial direction. Figure 3 The cross-sectional view in FIG. 4 shows that the elastic latch arm 42a is connected to the motor cover 38 or the rear side 40 in the connection area 43a. These components are produced integrally in a single plastic injection molding operation. Starting from the connection area 43a, the elastic latch arm 42a is bent forward with a first bend 44a of approximately 80°, wherein the bend is slightly larger. Immediately after this first bend 44a, the elastic latch arm 42a is bent in the opposite direction by a second bend 45a, specifically, approximately twice, i.e. approximately 160°. The first bend 44a and the second bend 45a are advantageously regular.

[0042] Immediately after this second bend 45a, the resilient latching arm 42a bends again in the opposite direction with a third bend 46a of approximately 80°, which is advantageously slightly smaller than the first bend 44a. After the third bend 46a, the latching end 47a of the resilient latching arm 42a, although relatively short, advantageously points again in the radial direction. Its extension should here be directed precisely to the longitudinal center axis of the rotor 28.

[0043] The latch end 47a has a bevel 48a pointing downward and to the left, for example at an angle of about 45° to the longitudinal center axis. The angle of this bevel 48 should be approximately parallel to the angle of the bevel 35 of the latch projection 34. The latch end 47 engages behind the latch projection 34, thereby producing a latch connection. When making such a latch connection, the latch end 47a can easily slide along the bevel 35 of the latch projection 34 with its bevel 48a, which is well known for latch connections. In the process, due to the elasticity of the elastic latch arm 42a, the latch end 47a is radially deflected away from the latch projection 34 until it can engage behind the latch projection 34.

[0044] In order to produce the latching connection, an axially protruding protrusion 49a is molded shortly before the latching end 47a, which can have a length of 0.5 cm to 1 cm. By applying pressure to this protrusion 49a in the axial and radial direction, the latching end 47a can be firmly introduced behind the latching protrusion 34 in any case. Figure 3 It is evident that the resilient latching arm 42a has a certain degree of axial mobility relative to its latching end 47a, since it extends integrally in the radial direction and is made of a suitably resilient but at the same time strong plastic material. However, in this orientation, the resilient latching arm 42a is intended to simultaneously hold the motor cover 38 on the motor 13 and secure it against removal.

[0045] The repeatedly bent configuration of the resilient latching arm 42a and its three bent portions 44a, 45a and 46a provide a certain degree of elasticity in the radial direction, which is required to ensure that the latching end 47a can move slightly in the radial direction when the latching connection is produced so as to then engage behind the latching protrusion 34. This radial movability or bendability to produce the latching connection does not itself impair the holding effect in the axial direction, although naturally the resilient latching arm 42a as a whole is slightly less rigid as a result.

[0046] By providing three resilient latching arms 42a, 42b and 42c, a sufficiently large holding force can be achieved overall to hold the motor cover 38 on the motor 13. The precise design of the resilient latching arms 42a to 42c is also important here.

[0047] Furthermore, provision can be made for the elastic latching arms 42a to 42c to be constructed in a simple configuration so that when the motor cover 38 is slid onto the motor 13 from behind, a latching connection is automatically produced, the retaining bolt 52 engaging in the retaining recess 18. As a result, the latching ends 47 of the elastic latching arms 42 automatically and independently engage behind the corresponding latching projections 34 on the receiving cup 32. However, it is then not possible for the elastic latching arms 42a to 42c to be preloaded in the position of the final latching connection or the end position, so that they press the motor cover 38 onto the motor 13 still more firmly by their own preload. If this is desired, the elastic latching arms 42a to 42c can be constructed so that, in accordance with the Figure 4 The end position of the motor cover 38 on the motor 13 of the motor 13, they still do not engage with their latching ends 47 behind the latching projections 34. When the elastic latching arms 42 are in the basic position, they can rest there, or even be axially spaced a little from it. Then, by pressing the projections 49 axially and slightly in the radially outward direction, each elastic latching arm 42 is moved towards the front end of the motor, and thus, in particular with the help of the inclined surfaces 48 and 35, the corresponding latching end 47 is pushed behind the projections 34. In this process, the elastic latching arms 42 are preloaded or receive a preload, which then acts as a permanent force to push the motor cover 38 against the motor 13. In this way, a stable, reliable and durable connection is achieved. Unlike the automatically produced latching connection, when introducing the motor cover 38 onto the motor 13 from the rear, a certain degree of assembly work is required, whether using automated equipment or manually, in particular by applying appropriate pressure to the projections 49. However, this work is not great and cannot be performed incorrectly. Furthermore, the preload on the resilient latching arms 42 achieved in this way allows a very stable fastening of the motor cover 38 to the motor 13 .

[0048] Figures 5 to 7 An alternative second exemplary embodiment of a resilient latch arm is shown in FIG. Figure 5 The rear view of the motor cover 138 with the rear side 140 shows that the ventilation slots 141 are also arranged in the radial direction on the one hand. In addition, three elastic latch arms 142a, 142b and 142c are provided, each of which has the same configuration. Figure 7 The thickness of these resilient latch arms shown in the side view in FIG. 1 advantageously corresponds to the material thickness of the rest of the motor cover 138. However, they can be wider, such as Figure 7 In particular, Figures 1 to 4 Compared to the resilient latching arms 42 , they can be rotated through 90° and do not have any bends but instead extend completely straight. Figure 5 and Figure 7A comparison of the elastic latching arms 142a to 142c shows that these elastic latching arms 142a to 142c are not movable or bendable at all in the radial direction. In addition, they are also barely bendable or movable in the axial direction, because their large width leads to a significant axial stability. Figure 7 It is also evident that a positive locking latching connection cannot be achieved, as described for the first configuration, with which the latching end 147a of the elastic latching arm 142a engages behind the latching projection 134 on the receiving cup 132 of the rear bearing seat 130. In this respect, Figure 6 The enlarged rear view of schematically shows that the resilient latch arms 142a to 142c can move or bend in a lateral direction relative to their longitudinal extension, which is at right angles to the longitudinal center axis. Figure 6 The solid line in FIG. 1 shows how the resilient latch arm 142a bends laterally to the left when the motor cover 138 is introduced onto the motor from the rear. In the process, the latch end 147a bends so far to the left that it moves laterally past the latch projection 134. Figure 7 The elastic latch arm 142a then bends back to its basic position, which Figure 6 , where it then engages with the latch end 147a behind the latch protrusion 134.

[0049] Since such a deflection movement of the elastic latching arms 142a cannot be achieved with the same ramps as in the first exemplary embodiment, an option is provided to bend the ends of the elastic latching arms 142a laterally when introducing the motor cover 138 using projections similar to the projections 49 of the first exemplary embodiment. Manual assembly is then advantageously required, producing a form-locking latching connection individually in each case. In this case, it can advantageously be provided that the retaining bolts of the motor cover 138 already engage in the retaining recesses 18 of the laminated stator core 17 in order to prevent the motor cover 138 from rotating relative to the motor.

[0050] Alternatively, the inclined surface may be provided in reverse so that when axial movement occurs, Figure 6 The end region of the resilient latch arm 142a shown in FIG. 1 is deflected and moved, and then the ramp can be as shown in FIG. Figure 8134 and 147a. This is a view from the longitudinal center axis in the radial direction and shows, on the one hand, a projection 134 with a chamfer 135 and, on the other hand, a resilient latching arm 142a with a chamfer 148a. The resilient latching arm 142a is introduced in the axial displacement direction according to the arrow and, by sliding the chamfer 135 on the one hand and the chamfer 148a on the other hand against each other, a deflection movement of the end region of the resilient latching arm 142a occurs. In the deflected position indicated by the dashed line, the resilient latching arm 142a or its latching end 147a can then be moved transversely in the axial direction past the projection 134. When it passes, it may spring back there behind into the basic position indicated by the dotted line, in which it rests in a form-locking manner on the side of the latching projection 134 opposite the chamfer 135.

[0051] It is clear that this second exemplary embodiment enables a greater force absorption in the axial direction or a stronger latching connection in the axial direction. However, at the same time, the assembly effort may be increased.

Claims

1. A motor, comprising: -stator, - a rotor having a front end and a rear end, - a rotor bearing assembly for the rotor, the rotor bearing assembly having a rear bearing seat for the rear end of the rotor, and - a motor cover in the area of ​​the rear bearing seat, in the motor cover is connected in a form-locking manner to at least the rear bearing seat, wherein the form-locking connection secures the motor cover against movement away from the motor in the axial direction of the motor, - the form-locking connection is configured as a form-locking latching connection with a latching projection on the bearing seat, - at least two resiliently elastic latching arms are formed on the motor cover, each of which interacts with one of the latching protrusions via a latching end as a latching connection, - the resilient latching arm is integrally connected to the motor cover in a region of more than 50% of the radial extension of the motor cover which is spaced from the longitudinal centre axis of the rotor, - The resilient latching arm is elongated and resiliently movable in at least one direction.

2. The motor according to claim 1, wherein: The motor is designed as a structural unit which has a pump for the liquid in the form of a liquid pump.

3. The motor according to claim 1, wherein: The resilient latching arms are all constructed identically.

4. The motor according to claim 1, wherein: Each resilient latch arm extends substantially in one plane.

5. The motor according to claim 1, wherein: Each resilient latching arm is bent at least once from its integral connection with the motor cover to a free end having the latching end.

6. The motor according to claim 5, wherein: Each resilient latching arm, from its integral connection with the motor cover to the free end with the latching end, has opposite bends in an S-shape, in each case twice or three times.

7. The motor according to claim 5, wherein: The curvature provides the free end of the resilient latching arm with resilient movability and flexibility parallel to the longitudinal center axis and with resilient movability and flexibility in the radial direction.

8. The motor according to claim 1, wherein: A sloped surface is provided at the free end of the elastic latching arm as a latching end, wherein the sloped surface points away from the longitudinal center axis in a direction from the rear bearing seat toward the front bearing seat.

9. The motor according to claim 1, wherein: The width of each resilient latch arm decreases from its integral connection to the motor cover to the free end.

10. The motor according to claim 1, wherein A protruding projection is formed at the free end of each resilient latch arm, the projection projecting rearwardly as a manual handle for manually releasing the latch connection.

11. The motor according to claim 1, wherein: The length by which the latching protrusion radially protrudes from the bearing seat is between 1% and at most 20% of the diameter of the rear bearing seat.

12. The motor according to claim 1, wherein At least two retaining pegs protrude parallel to the longitudinal center axis from the motor cover toward the front end of the rotor, wherein the retaining pegs engage in recesses in the stator to secure the motor cover against rotation about the longitudinal center axis.

13. The motor according to claim 1, characterized in that The resilient latching arms extend substantially in the radial direction towards the longitudinal center axis.

14. The motor according to claim 1, wherein Starting from their integral connection with the motor cover, the resilient latching arms first extend in the radial direction and then bend in a curve towards the front end of the rotor, wherein they then bend in another curve towards the longitudinal centre axis.

15. The motor of claim 14, wherein the bend is approximately 90° and is formed with a wide radius.

16. The motor according to claim 14, wherein: After the last bending, the resilient latching arms are bent again by about 90° so that they then point in a direction generally parallel to the longitudinal center axis and away from the rotor, wherein the latching ends on the resilient latching arms are then arranged adjacent thereto.

17. The motor according to claim 16, wherein: The latching end is arranged on the resilient latching arm and is again directed towards the longitudinal centre axis with a bend of approximately 90° so that the latching end is directed towards the longitudinal centre axis.

18. The motor according to claim 1, wherein The resilient latching arm is constructed so that in a basic position in which the motor cover is not placed on the motor and the resilient latching arm is not force loaded or snapped onto the latching connection, a distance is provided between the latching end and the latching protrusion, the distance being directed away in the direction of the longitudinal center axis.

19. The motor according to claim 18, wherein: The distance is 0.2 cm to 2 cm or 2% to 30% of the length of the resilient latch arm.

20. The motor according to claim 1, wherein The positive locking connection is in a direct radially inward direction of the integral connection of the resilient latching arms to the motor cover.

21. A pump having a pump component and the motor according to claim 1, wherein: The motor is arranged on the pump element such that the motor and the pump element form the pump as a structural unit.

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