Electric motor for a heating / air conditioning fan

Abstract

The invention relates to an electric motor (6) for a heating / air conditioning fan, having an electric motor (10) with motor electronics (14) which are accommodated in an electronics housing (16), wherein the electronics housing has a heat sink cover (20) for temperature control of the motor electronics, and a heat sink device (40) for guiding an air flow (42), wherein the heat sink device has a motor support (12) for holding the electric motor, the motor support having a central recess in which the electronics housing is arranged, the heat sink device has a pot-shaped cover (44) which rests on and engages with the motor support, an air guiding space (46) for guiding the air flow (42) along the heat sink cover is formed between the motor support and the cover, and the motor support has an inlet (48) for the air flow, which is fluidically coupled to the air guiding space.

Description

Technical Field

[0001] This invention relates to an electric motor for a heating / air conditioning fan, the motor comprising an electric motor with motor electronics housed in a housing, wherein the housing has a heat dissipation cover for temperature regulation of the motor electronics. This invention also relates to a heating / air conditioning fan for a motor vehicle. Background Technology

[0002] Motor vehicles typically have heating / air conditioning fans as part of heating, ventilation, and air conditioning (HVAC) technology, which deliver heated or cooled air into or circulate within the vehicle's interior space. For this purpose, the HVAC fan includes a fan impeller driven by an electric motor equipped with an HVAC electric motor. The fan impeller is coupled to the shaft of the electric motor, which is fixed to a rotor against relative rotation. During operation, the rotor itself is driven by a stator, which, if the electric motor is designed as a brushless DC motor, includes a number of electromagnets appropriately interconnected. These electromagnets are formed by coils of electricity placed or wound on the teeth of laminations on the stator.

[0003] In brushless electric motors, the alternating current used to power the stator windings is typically generated by a converter (inverter). In small electric motors, this converter, along with its associated control electronics, is usually housed as motor electronics in an electronics housing or enclosure.

[0004] HVAC electric motors typically include a motor bracket that forms or contains the housing of the electronic components. For example, the motor bracket may be implemented here as an intermediate wall between the motor electronics and the stator.

[0005] During motor operation, the stator coils heat up, resulting in higher resistance. To avoid this, for example, an airflow is used to flush the electric motor to dissipate the heat.

[0006] Electronic devices typically have circuit boards on which the (power) semiconductor switches of the converter circuit are arranged. When power demand is high, the current and voltage switched by the semiconductor switches are also relatively large, resulting in relatively high switching losses. Therefore, the semiconductor switches will generate significant heat during motor operation. The required heat dissipation power depends on the temperature of the heat sink, which is typically part of the electronic device housing and / or motor bracket.

[0007] Therefore, reliable heat dissipation for electronic components and electric motors is crucial for the reliable and safe operation of the motor and its sustained performance. In particular, electronic components typically exhibit high thermal sensitivity, thus requiring reliable heat dissipation. For this purpose, for example, cooling airflow is directed along a heat sink towards the electronic components and through the electric motor. Summary of the Invention

[0008] The objective of this invention is to describe a particularly suitable motor for heating / air conditioning fans. In particular, it is necessary to achieve particularly effective and reliable heat dissipation for the motor electronics, and preferably for the electric motor. Another objective of this invention is to describe a particularly suitable heating / air conditioning fan.

[0009] According to the invention, this task is solved with respect to the motor using the features of claim 1, and with respect to the heating / air conditioning fan using the features of claim 14. Advantageous designs and improvements are the subject of the dependent claims. The advantages and designs listed with respect to the motor can also be similarly applied to the heating / air conditioning fan, and vice versa.

[0010] The electric motor according to the invention is particularly configured and suited for use as a heating / air conditioning fan in a motor vehicle. Here, the motor has an electric motor, preferably implemented as a brushless HVAC electric motor. Here, the electric motor has a stator and a rotor supported in a manner rotatable relative to the stator, as well as motor electronics.

[0011] The motor electronics are housed in an electronics housing. The electronics housing may be at least partially formed by the motor support, but preferably, the electronics housing is implemented as a separate component from the motor support.

[0012] In addition to the active and passive components interconnected in the converter circuit, such as multiple power semiconductors, motor electronics also have circuit boards (printed circuit boards, PCBs).

[0013] The electronic device housing has a can-shaped electronic device box and an electronic device box cover. The electronic device box has a (can) bottom and a surrounding (shell or can) sleeve as a shell wall. A structural space for accommodating the electronic device is formed within the electronic device box, and this structural space is closed by means of the electronic device box cover placed on the end side. A motor electronic device, for example implemented as a power electronic device, is placed together with a circuit board into the electronic device box or into the structural space formed therein, on which electrical or electronic components or parts are arranged. The components or parts of the motor electronic device or circuit board form a circuit, for example, forming a converter circuit or an inverter circuit.

[0014] In electric operation, the switching process generates alternating current in the circuitry of the (motor) electronic components and in the rotating windings of the motor or stator. To regulate the temperature or dissipate heat from the motor's electronic components, the component housing has a heat sink. This heat sink is preferably implemented as a cover for the electronic component housing, i.e., as a heat sink or heat dissipation body. The airflow for heat dissipation is guided through the heat sink or heat dissipation body by means of the motor's cooling system.

[0015] Here, the heat dissipation device includes a motor bracket for supporting the electric motor and a shield (air cover) mounted on and engaged with the motor bracket. The motor bracket has a central open space in which the electronic device housing is arranged. In other words, the electronic device housing is mounted in the open space of the motor bracket. The shield, which is generally canister-shaped or cup-shaped, has a (canister) bottom and a surrounding (canister) sleeve that serves as a hollow cylindrical or tubular housing wall.

[0016] According to the present invention, an air guiding space or air duct (heat dissipation air cavity) is formed between the motor bracket and the shield for guiding airflow along the heat sink. Here, the air guiding space is technically coupled to the inlet of the motor bracket, through which airflow can be guided into the air guiding space. Preferably, the shield has an opening or void in the inlet region. This results in a particularly suitable motor.

[0017] Heat dissipation devices, particularly motor brackets and shields, form heat dissipation channels through which air flows, for dissipating heat from motor electronics or electric motors. The heat dissipation device is implemented such that it guides airflow across the area between the heat sink and the shield to dissipate (waste) heat generated by the motor electronics and to serve as heat dissipation. At least partial integration of the heat dissipation device also achieves particularly space-saving and compact heat dissipation channels.

[0018] Preferably, the motor bracket and the shield are joined in a way that is as airtight as possible, so that the leakage flow of air from the air guide space is minimized. This allows the airflow used for heat dissipation and heat dissipation to flow effectively across the surface of the heat sink or heat sink cover.

[0019] "Axial" or "axial direction" is understood herein and hereinafter in particular as a direction parallel (coaxial) to the axis of rotation of the electric motor, i.e., a direction perpendicular to the end side of the stator. Accordingly, "radial" or "radial direction" is understood herein and hereinafter in particular as a direction perpendicular (transverse) to the axis of rotation of the electric motor along the radius of the stator or electric motor. "Tangential" or "tangential direction" is understood herein and hereinafter in particular as a direction along the circumference (circumferential direction, azimuth direction) of the stator or electric motor, i.e., a direction perpendicular to both the axial and radial directions.

[0020] In the preferred design, the air-guiding space is open towards the electric motor, allowing the airflow entering through the inlet to flow over the electronics housing and be axially guided towards the electric motor. This means that the cooling air flowing around the electronics housing continues to flow through the electric motor, thus cooling the stator coils or transverse windings. This achieves a particularly suitable cooling system for the motor.

[0021] In an advantageous embodiment, the shield is shape-locked and / or force-locked engaged with the motor bracket. This ensures that the shield is securely supported on the motor bracket during operation.

[0022] The conjunction “and / or” is understood here and in the following text as meaning that, by virtue of the characteristics of the linking conjunction, they can be formed together or alternatively to each other.

[0023] The term "form-locking" or "form-locking connection" between at least two interconnected components is understood here and below in particular as the joining of the interconnected components in at least one direction by direct interlocking of the contours of the components themselves or by indirect interlocking via additional connectors. Therefore, the "prevention" of mutual movement in that direction is caused by the shape.

[0024] "Force-locking" or "force-locking connection" between at least two interconnected parts is understood here and in particular as the parts being prevented from slipping relative to each other by friction acting between them. If the "connecting force" that creates this friction (meaning the force that presses the parts together, such as a bolt force or their own weight) is absent, the force-locking connection cannot be maintained and will therefore loosen.

[0025] In a suitable improvement, the shield is vibratoryly decoupled from the motor mount. In other words, vibrations and / or shocks occurring between the motor mount and the shield are damped or reduced. Preferably, there is no direct (mechanical) contact between the shield and the motor mount, thereby preventing vibrations generated by the electric motor from being transmitted to the shield. This improves the motor's NVH (Noise, Vibration, and Harshness) behavior. In particular, it reduces or completely eliminates shield vibrations that can lead to structural sound transmission and ultimately audible airborne sound.

[0026] In possible configurations, the motor mount has a number of damping elements, with the shield section supported on these elements. The damping elements are configured and suitably positioned to dampen or reduce vibrations and / or shocks. For example, the damping elements are constructed as elastomers. For instance, the motor mount has three damping elements distributed circumferentially for supporting or abutting the shield in a vibration-decoupled manner. This ensures a reliable reduction in the motor's NVH power, which is particularly desirable in applications near the passenger compartment of motor vehicles, such as in heating / air conditioning fans.

[0027] An additional or further aspect of the invention is that the motor bracket has an axially projecting annular flange surrounding the electronic device housing, on which a shield is mounted. The shield is mounted on the annular flange such that it at least partially surrounds or encloses the annular flange on its outer periphery. Therefore, the shield is mounted on the annular flange in a form-locking manner in the radial direction. This allows for simple and stable mounting of the shield to the motor bracket. In particular, mounting the shield on the annular flange substantially achieves a labyrinth seal for the air-guided space.

[0028] The mask is implemented, for example, as an injection molded part. In the circumferential direction, the inner surface of the mask has, for example, a chamfer or draft angle, which is suitable for assembly with a motor bracket.

[0029] In a favorable improvement, the annular flange is stabilized using a number of tangentially distributed, radially outwardly oriented support ribs. Here, the shield has a number of slotted or slit-like receptacles on its edge facing the motor bracket, corresponding to the number of support ribs, in which the support ribs are at least sectionally form-locked. In other words, the shield is placed onto the support ribs by means of the receptacles. Therefore, during assembly, the support ribs of the motor bracket or the annular flange are inserted into the receptacles of the shield. Thus, the support ribs and receptacles act as positioning and orientation aids during assembly. Furthermore, in the assembled state, tangential form-locking is achieved between the motor bracket and the shield, thereby preventing torsion.

[0030] In conceivable design schemes, the annular flange is segmented with at least one tangential opening. This means that the annular flange has an interruption at at least one location. Here, within the area of ​​the opening, the motor bracket has a damping element. Therefore, the edge of the end face of the shield correspondingly has an axially protruding protrusion in the area of ​​the opening that abuts against the damping element. This means that at the location of the damping element, the shield has a protrusion acting as a support foot, which is substantially positioned within the opening of the annular flange, and this protrusion is preferably pressed or squeezed against the damping element to achieve a higher sealing effect. Here, it is preferable to provide three tangentially distributed openings, damping elements, and protrusions. This achieves a robust and stable three-point support for the shield.

[0031] For safe and stable fastening, the cover has two radially outward-oriented or curved flanges arranged opposite each other along the diameter on the end side facing the motor bracket, by means of which the cover can be shape-locked and / or force-locked fastened to the motor bracket.

[0032] For example, the shield can be fastened to the motor bracket with screws using a flange plate. However, the motor bracket preferably has two axially protruding engagement protrusions as rivets, which are heat-riveted to the flange plate. In other words, the two flange plates and the columnar or bolt-shaped engagement protrusions of the shield are fastened to the motor bracket by heat riveting or hot riveting. The motor bracket is preferably implemented as an injection molded part, wherein, in particular, the axially oriented engagement protrusions are integrally formed, i.e., one-piece or integrally formed, on the motor bracket. The motor bracket and the formed engagement protrusions are made, for example, of polypropylene (PP) or polyphenylene sulfide (PPS).

[0033] To join the motor mount and the shield, the engagement protrusion passes through the flange plate at least segmentally on the free side; for this purpose, the flange plate has through openings on each side. The free ends of the engagement protrusion are heat-riveted and thus deformed. During the heat riveting process, the free ends of the engagement protrusions protruding from the flange plate are reshaped by heat riveting into form-locking and / or force-locking domes (riveting points). This achieves axial form-locking and / or force-locking, thereby securely holding the shield to the motor mount. This results in particularly stable and NVH-optimized fastening of the shield on the motor mount.

[0034] In a particularly advantageous embodiment, the bottom section of the shield, arranged substantially parallel to the heat sink, is axially shaped inward. In other words, the bottom section is shaped towards the heat sink. From the outside, the bottom thus has a rib-like recess or indentation. This axial inward shaping of the bottom reduces the distance between the bottom and the heat sink.

[0035] This implementation takes into account the fact that the heat sink or heat plate preferably matches the contour of the motor electronics components arranged on the circuit board. Preferably, components occupying large structural space, such as capacitors or chokes, are arranged on a flat side of the circuit board away from the motor and thus towards the bottom of the heat sink or shield, resulting in a varying axial height for the heat sink. The purpose of this design is to match the airflow entering through the inlet as closely as possible to the heat sink, thereby ensuring effective heat dissipation. By varying or matching the spacing between the bottom and the heat sink, a more uniform airflow along the heat sink is thus ensured. This improves heat dissipation for the heat sink or motor electronics.

[0036] In a particularly suitable design, a certain number of air-guiding ribs are integrally formed on the inner side of the shield, either as a single piece or as a whole, to guide airflow. In other words, the shield is provided with air-guiding ribs, wherein the axial height of the ribs is coordinated with the distance from the heat sink cover, and the air flowing in through the inlet is evenly distributed on the surface of the heat sink cover with the help of the air-guiding ribs. This achieves uniform heat dissipation from the heat sink cover.

[0037] An advantageous configuration of this motor involves increasing the flow cross-section of the inlet towards the air guiding space. In other words, the inlet is widened towards the air guiding space. This enables a diffuser structure for guiding the airflow, in which the flow cross-section is expanded along the direction of airflow. As a result, the airflow is slowed down and thus cooled, thereby reducing the air temperature. This further improves the heat dissipation efficiency of the heat dissipation device.

[0038] The heating / air conditioning fan according to the invention is preferably part of a motor vehicle. The heating / air conditioning fan here has the motor described above. The heating / air conditioning fan is particularly understood herein as a fan by means of which, during operation, heat and / or cool air is delivered to the interior space of the motor vehicle, such as the passenger compartment. Alternatively or in combination therewith, air is circulated within the interior space by means of the heating / air conditioning fan. The heating / air conditioning fan is preferably part of an air conditioning system. The heating / air conditioning fan itself includes a motor and a fan impeller technically coupled to the motor, the fan impeller being connected to the shaft of the electric motor, on which a rotor is preferably connected, the rotor being driven by means of a stator during operation.

[0039] The fan impeller is, for example, a radial-flow fan impeller. This means that heating / air conditioning fans are specifically constructed as radial-flow fans, which axially draw in air and (after a deflection (90°)) radially expel the air. Compared to axial-flow fans, radial-flow fans produce less noise. In particular, radial-flow fans achieve significantly lower sound pressure levels for the same airflow power. This results in noise-reduced heating / air conditioning fans, which are particularly suitable for use near passenger compartments. Attached Figure Description

[0040] Embodiments of the present invention will now be explained in more detail with reference to the accompanying drawings. Wherein:

[0041] Figure 1 Heating / air conditioning fan shown in perspective;

[0042] Figure 2 A perspective sectional view showing the heating / air conditioning fan;

[0043] Figure 3 A perspective view showing an unshielded heating / air conditioning fan;

[0044] Figure 4 The mask is shown from the outside in perspective; and

[0045] Figure 5 The mask is shown from the inside in a perspective view.

[0046] In all drawings, the corresponding parts and dimensions are always labeled with the same reference numerals. Detailed Implementation

[0047] exist Figures 1 to 3 The image shows a heating / air conditioning fan 2 for a heating or air conditioning system of a motor vehicle. The heating / air conditioning fan, hereinafter also simply referred to as fan 2, includes a fan impeller 4, which is designed as a radial flow fan impeller. The fan impeller 4 is driven by a motor 6 implemented as an electric drive.

[0048] The fan impeller 4 is connected here to the motor shaft 8 of the electric motor 10 of the motor 6. The electric motor 10 is here fastened to the motor bracket 12, wherein the electric motor 10 is substantially completely housed in the motor bracket 12 and surrounded by the motor bracket.

[0049] The electric motor 10 is connected to the electric motor electronics 14 in terms of signal technology. The motor electronics 14 here has an electronics housing 16, which has, for example, an electronics box 18 implemented as an aluminum die-casting and a heat sink or heat dissipation body constructed as a heat sink cover 20 or an electronics box cover. The heat sink cover 20 is, for example, a bent sheet metal piece. The motor electronics 14 also has an interface 22 for making electrical contact with electrical lines or cables.

[0050] The electric motor 10 is particularly a brushless internal rotor motor or internal mover motor. The electric motor 10 is essentially formed by a stator 24 wound with, for example, a three-phase field winding or stator winding 26 in the form of coils. Figure 2The electric motor 10 also includes a permanently excited rotor 28, which is supported inside the stator 24 in a manner that allows it to rotate about an axially oriented motor axis. To support the shaft-fixed rotor 28, the electric motor 10 has two rolling bearings 30 that act on the motor shaft 8 from axially opposite sides.

[0051] The rotor 28 (not shown in detail) is formed of laminations in which permanent magnets are placed to generate an excitation magnetic field, wherein the laminations and the placed permanent magnets are, for example, encapsulated by injection molding with a plastic sleeve 28a. In a similar manner, the stator 24 has a stator body implemented as a lamination assembly, the stator body being encapsulated by injection molding with a plastic sleeve 24a, for example.

[0052] The plastic sheath 28a of the rotor 28 has protruding engagement protrusions 28b on the end side for fastening the fan impeller 4. The integrally formed engagement protrusions 28b are, for example, thermally riveted to the fan impeller 4.

[0053] The motor bracket 12 is formed, in particular, by a one-piece injection molded part made of plastic, such as polyphenylene sulfide (PPS). The motor bracket 12 has a central through-hole (not shown in detail) in which the electric motor 10 and motor electronics 14 are mounted. The motor 6, and thus the entire fan 2, is secured to the vehicle via the motor bracket 12, for which the motor bracket is provided, for example, with three screw mounts 32 protruding from its outer periphery.

[0054] The motor electronics 14 has a circuit board 34, on which a converter circuit 36 ​​is arranged on the side of the circuit board facing the electric motor 10, and on the side of the circuit board facing away from the electric motor 10 and covered by a heat sink 20, components 38 occupying a large structural space are arranged. The circuit board 34 and the components 36, 38 arranged thereon are housed in the structural space of the electronics housing 16 enclosed by the electronics box 18 and the heat sink 20 and are in contact with the interface 22.

[0055] Especially Figure 2 As can be seen, the heat sink 20 matches the contour of the component 38 of the motor electronics 14 arranged on the circuit board 34, thereby giving the heat sink 20 different axial heights.

[0056] During electric operation, the conversion process generates alternating current in the circuitry of the motor electronics 14 and in the rotating winding 26 of the electric motor 10 or stator 24. To regulate or dissipate heat from the motor electronics 14, the inverter circuit 36 ​​is thermally coupled to the electronics housing 18, and the components 38 are thermally coupled to the heat sink 20. The electronics housing 16, and consequently the motor electronics 14, utilizes an airflow 42 guided by the heat sink 40 (…). Figure 2(To dissipate heat.) Airflow 42 in Figure 2 The arrows are shown in the figure, and the arrows are only provided with reference numerals for illustrative purposes.

[0057] The heat dissipation device 40 is basically formed by the motor bracket 12 and the shield (air cover) 44 placed on it.

[0058] Especially from Figure 2 As can be seen, an air guiding space 46 or air guiding space (heat dissipation air cavity) is formed between the motor bracket 12 and the shield 44 for guiding the airflow 42 along the heat sink 20. The air guiding space 46 is fluidly coupled to the inlet 48 of the motor bracket 12, through which the airflow 42 can be guided into the air guiding space 46.

[0059] Inlet 48 is implemented as a generally radially oriented lateral cantilever protruding from the outer periphery of the fan impeller 4. Inlet 48 has a downwardly oriented inlet opening 50, that is, toward the fan impeller 42, through which airflow 42 enters inlet 48. (Refer to reference...) Figure 1 and 3 The perspective view clearly shows that the inlet 48 has a funnel-shaped expansion or widening portion in the direction toward the shield 44 or the air guiding space 46. This means that the flow cross-section of the inlet 48 increases in the direction toward the air guiding space 46. This implements a diffuser structure for guiding the airflow 42, wherein the airflow 42 is slowed down and thus cooled as it is guided into the air guiding space 46.

[0060] The heat dissipation device 40 is configured to guide the airflow 42 through the area between the heat sink 20 and the shield 44, thereby dissipating (waste) heat generated by the motor electronics 14 and serving as a heat dissipation mechanism. Preferably, the motor bracket 12 and the shield 44 are joined as airtight as possible to minimize leakage of the airflow 42 from the air guide space 46. For example, a sealing element (not shown in detail) is provided between the motor bracket 12 and the shield 44 for this purpose.

[0061] from Figure 2 As can be seen, the air guiding space 46 is open toward the electric motor 10, so that the airflow 42 entering through the inlet 48 washes over the electronics housing 16 and is axially guided toward the electric motor 10. In particular, the airflow 42 also dissipates heat from the electronics housing 18. Referring to the airflow 42 indicated by the arrow, the cooling air flowing around the electronics housing 16 is further guided through the electric motor 10, and thus dissipates heat from the stator windings 26. The heat dissipation devices 40, especially the motor bracket 12 and the shield 44, thus form a heat dissipation channel through which air flows or is able to flow, for dissipating heat from the motor electronics 14 and the electric motor 10.

[0062] exist Figure 4 and Figure 5 Mask 44 is shown separately. Mask 44, which is can-shaped or cup-shaped, is implemented, for example, as a deep-drawn part, especially as a sheet metal deep-drawn part, or preferably as an injection-molded part.

[0063] The shield 44 has a (can) bottom 52 as an end face and a surrounding (can) sleeve 54 as a hollow cylindrical or tubular shell wall. In the region of the inlet 48, the sleeve 54 has a slit 56 as an inlet opening into the air guiding space 46. The sleeve 54 also has a slit 57 as an opening for the interface 22. Figure 5 ).

[0064] The bottom 52 of the shield 44 is axially shaped inwards in a segment, substantially parallel to the heat sink 20. The bottom 52 here has a rib-like recess 58, which reduces the distance between the bottom 52 and the heat sink 20, i.e., the net span. Especially... Figure 2 As can be seen, the recess 58 is basically arranged in the inlet area where no component 38 is arranged. This ensures that the airflow 42 flowing in through the inlet 48 matches the heat sink as closely as possible, thereby ensuring effective and as uniform a heat dissipation.

[0065] exist Figure 5 The inner side of the shield 44 shown is provided with a number of air guiding ribs 60 for guiding the airflow 42. The air guiding ribs 60 are integrally formed, i.e., one-piece or integrally molded. In the illustrated embodiment, seven air guiding ribs 60 are provided, protruding axially from the bottom 52 or the recess 58. These air guiding ribs extend in a generally radial fan shape from the opening 56 on the bottom 52 and, in particular, the recess 58. The air guiding ribs 60 are shown as reference numerals in the figures only as examples.

[0066] The axial height of the air guide rib 60 (as in) Figure 2 (As can be seen in the image) The distance between the airflow 42 and the heat sink 20 is coordinated. The airflow 42 flowing in through the inlet 48 is evenly distributed on the surface of the heat sink 20 by means of the air guide ribs 60, thereby ensuring uniform heat dissipation from the heat sink 20.

[0067] To secure and / or support the shield 44, the motor bracket 12 has an axially projecting annular flange 62 that tangentially surrounds or encloses the central opening of the motor bracket 12. For example, in Figure 2 and Figure 3 As can be seen, the annular flange 62 thus surrounds the electronic device housing 16, wherein the shield 44 is placed on the annular flange 62 in the engaged or assembled state.

[0068] The mask 44 is placed on the annular flange 62 such that the mask 44 at least partially surrounds the annular flange 62 on its outer periphery. For example, especially... Figure 2 As can be seen, the shield 44 and the annular flange 62 preferably do not have direct (mechanical) contact. The shield 44 and the annular flange 62 are radially spaced apart to prevent vibrations generated by the electric motor 10 from being transmitted to the shield 44. In the circumferential direction, the inner surface of the shield 44 has, for example, a draft angle suitable for assembly with the motor bracket 12 or the annular flange 62.

[0069] The annular flange 62 is mechanically stabilized or reinforced by a number of tangentially distributed and radially outwardly oriented support ribs 64. The ramp-shaped or wedge-shaped support ribs 64 are only shown as illustrative reference numerals in the figures.

[0070] The sleeve 54 of the cover 44 has a number of slotted or slit-like receiving portions 66 on its edge facing the motor bracket 12, corresponding to the number of support ribs 64. The support ribs 64 are, for example, as shown in... Figure 1 The shield 44 is at least segmentally and shape-locked into the receiving portion 66. In other words, the shield 44 is placed or inserted into the support rib 64 by means of the receiving portion 66. The support rib 64 and the receiving portion 66 thus function as positioning and orientation aids during assembly. Furthermore, in the assembled state, a tangential shape-locking is achieved between the motor bracket 12 and the shield 44, thereby preventing torsion.

[0071] The annular flange 62 is provided with three tangential gaps 68 in segments. Here, the motor bracket 12 has a damping element 70 in the area of ​​the gap 68 to achieve vibration decoupling and / or vibration decoupling, and the shield 44 is placed on the damping element.

[0072] The plastic sheath 24a of the stator 24 has axially oriented rivets 24b for fastening to the electronic device housing 16, particularly to the electronic device case 18. In the illustrated embodiment, three circumferentially distributed rivets 24b for thermal riveting to the electronic device case 18 are integrally formed onto the plastic sheath 24a. The plastic sheath 24a also has three circumferentially distributed retaining protrusions 24c. The radially oriented retaining protrusions 24c are radially formed on the outer periphery of the plastic sheath 24a. The retaining protrusions 24c secure the three damping elements 70 to the stator 24 to dampen vibrations and / or shocks between the electric motor 10 and the motor bracket 12. Figure 2 The damping element 70 is exposed on its end side toward the shield 44, so that the shield 44 can rest against the damping element 70.

[0073] In order to rest or be supported on the damping element 70, the sleeve 54 of the cover 44 has three axially protruding protrusions 72 on the edge of the end side as support feet.

[0074] Preferably, the protrusions 72 are pressed or squeezed against their respective damping elements 70 to achieve a higher sealing effect. To achieve such sealing or squeezing pressure and to force-lock and / or shape-lock the cover 44 to the motor bracket 12, the cover 44 is joined to the motor bracket 12 by means of thermal riveting.

[0075] For this purpose, the shield 44 has two radially outwardly oriented or curved flange plates 74 arranged diametrically opposite to each other on the end side facing the motor bracket 12. Each flange plate 74 has a hole-like through opening 76 for engaging the free end of the protrusion 78.

[0076] A bolt-shaped, pin-shaped, or nail-shaped engagement protrusion 78 is integrally formed onto the motor bracket 12. The engagement protrusion 78 is implemented as a rivet, wherein the free end of the engagement protrusion 78 is guided through the through opening 76 and is hot-riveted and thus reshaped. During the hot riveting process, the free end of the engagement protrusion 78 forms a form-locking and / or force-locking dome (riveting point) 80 by hot riveting. This achieves axial form-locking and / or force-locking, thereby securely holding the cover 44 onto the motor bracket 12.

[0077] This invention is not limited to the embodiments described above. Instead, those skilled in the art can derive other variations of the invention without departing from its subject matter. In particular, all the individual features described in the embodiments can be combined with each other in other ways without departing from the subject matter.

[0078] List of reference numerals

[0079] 2 Heating / Air Conditioning Fans 38 Components

[0080] 4. Fan impeller 40 Heat dissipation device

[0081] 6 motors, 42 airflow

[0082] 8 motor shafts 44 shields

[0083] 10 electric motors, 46 air-guided spaces

[0084] 12 Motor bracket 48 Inlet

[0085] 14 Motor electronic components 50 Inlet opening

[0086] 16 Electronic component housing 52 Bottom

[0087] 18 Electronic Component Casings (54 Sets)

[0088] 20 Heatsink cover 56 Reservation area

[0089] 22 Interface 57 Reservation Area

[0090] 24 Stator 58 Recessed portion

[0091] 24a Plastic sheath 60 Air guide rib

[0092] 24b Rivet 62 Annular Flange

[0093] 24c maintains the protrusion 64 support rib

[0094] 26 stator windings, 66 housing section

[0095] 28 Rotor 68 Reservoir

[0096] 28a Plastic sheath 70 Damping element

[0097] 28b Joint protrusion 72 Protrusion

[0098] 30 Rolling bearing 74 Flange plate

[0099] 32 Screw-mounted plate; 76 Through opening

[0100] 34 Circuit Board 78 Joint Protrusion

[0101] 36 Converter Circuit 80 Dome

Claims

1. A motor (6) for a heating / air conditioning fan (2), said motor having: - An electric motor (10) having motor electronics (14) housed in an electronics housing (16), wherein, The electronic device housing (16) has a heat sink (20) for temperature regulation of the motor electronic device (14), and - Heat dissipation device (40) for guiding airflow (42). - The heat dissipation device (40) has a motor bracket (12) for supporting the electric motor (10), the motor bracket having a central open space, and the electronic device housing (16) is arranged in the central open space. - The heat dissipation device (40) has a can-shaped shield (44), which is placed on the motor bracket (12) and engaged with the motor bracket. - Wherein, an air guiding space (46) is formed between the motor bracket (12) and the shield (44) for guiding airflow (42) along the heat sink (20), and - The motor bracket (12) has an inlet (48) for airflow (42) which is coupled to the air guiding space (46) in terms of flow technology.

2. The motor (6) according to claim 1. Its features are, The air guiding space (46) is open toward the electric motor (10) so that the airflow (42) entering through the inlet (48) washes over the electronic device housing (16) and is axially guided toward the electric motor (10).

3. The motor (6) according to claim 1 or 2. Its features are, The shield (44) engages with the motor bracket (12) in a shape-locking and / or force-locking manner.

4. The motor (6) according to any one of claims 1 to 2. Its features are, The shield (44) is fastened to the motor bracket (12) in a vibration decoupling manner.

5. The motor (6) according to any one of claims 1 to 2. Its features are, The shield (44) is supported in sections on the damping element (70) of the motor bracket (12).

6. The motor (6) according to any one of claims 1 to 2. Its features are, The motor bracket (12) has an axially protruding annular flange (62) that surrounds the electronic device housing (16), wherein the shield (44) is placed on the annular flange (62).

7. The motor (6) according to claim 6. Its features are, - The annular flange (62) is stabilized by a number of tangentially distributed and radially outward-oriented support ribs (64), and - The shield (44) has a number of receptacles (66) on the edge facing the motor bracket (12) corresponding to the number of the support ribs (64), the support ribs (64) being at least segmentally fitted in the receptacles.

8. The motor (6) according to claim 6. Its features are, The annular flange (62) is provided with at least one tangential clearance (68) in segments, wherein the motor bracket (12) has a damping element (70) in the region of the clearance (68), and wherein, in the region of the clearance (68), the edge of the shield (44) has an axially protruding protrusion (72) that abuts against the damping element (70).

9. The motor (6) according to any one of claims 1 to 2. Its features are, The shield (44) has two radially outwardly oriented flanges (74) arranged opposite each other along the diameter on the end side facing the motor bracket (12) for form-locking and / or force-locking fastening to the motor bracket (12).

10. The motor (6) according to claim 9. Its features are, The motor bracket (12) has an axially protruding engagement protrusion (78) that is thermally riveted to the flange plate (74).

11. The motor (6) according to any one of claims 1 to 2. Its features are, The bottom (52) of the shield (44) is axially inwardly segmented, thereby reducing the distance between the bottom (52) and the heat dissipation cover (20).

12. The motor (6) according to any one of claims 1 to 2. Its features are, A number of air guide ribs (60) for guiding airflow (42) are integrally formed on the inner side of the shield (44).

13. The motor (6) according to any one of claims 1 to 2. Its features are, The flow cross-section of the inlet (48) increases toward the air guiding space (46).

14. A heating / air conditioning fan (2), the heating / air conditioning fan having a motor (6) according to any one of claims 1 to 13 and a fan impeller (4) coupled to the motor in a driving technology.

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