CN111342595B - Electric motor with rolling bearing and device for dissipating heat from the rolling bearing - Google Patents
Electric motor with rolling bearing and device for dissipating heat from the rolling bearing Download PDFInfo
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- CN111342595B CN111342595B CN201911307833.1A CN201911307833A CN111342595B CN 111342595 B CN111342595 B CN 111342595B CN 201911307833 A CN201911307833 A CN 201911307833A CN 111342595 B CN111342595 B CN 111342595B
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- rolling bearing
- electric motor
- pot
- region
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1735—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
Abstract
The invention relates to an electric motor (1) having a stator (10) formed by windings and having motor electronics (14) which are arranged in a slot pot (2) made of plastic which is sealed with respect to the surroundings; with a rotor (11) formed by magnets arranged on the motor shaft (12); with at least one rolling bearing (13) supporting the motor shaft (12) on the slot pot (2); the device comprises a slotted can cover (3) which is adjacent to the motor electronics (14) and serves as a cooling body for dissipating heat from the motor electronics (14) and comprises means for dissipating heat generated by the rolling bearing (13) during operation of the electric motor (1). The electric motor according to the invention is characterized in that the can region (20) into which the outer ring (13 ') of the rolling bearing (13) is injected into the can (2) and the outer ring (13') is injected is in heat-conducting contact with the can cover (3).
Description
Technical Field
The invention relates to an electric motor having a stator formed by windings and having motor electronics, which are arranged in a plastic-made slot pot (Spalttopf) sealed with respect to the surroundings; with a rotor formed by magnets arranged on the motor shaft; with at least one rolling bearing supporting the motor shaft at the gap pot; the motor has a slotted can cover adjacent to the motor electronics, which can cover acts as a heat sink and which is used to dissipate heat of the rolling bearing which is generated during operation of the motor.
Background
An electric motor with a slot can housing and protecting the stator and the motor electronics is for example installed in an ambient environment in which there is a presence of harmful corrosive gases and/or liquids which, in the case of contact with the stator formed by the windings and with the motor electronics, would cause damage or even total destruction thereof. This advantage is a disadvantage in the present case in that the can makes it difficult to cool the rolling bearing that supports the motor shaft on the can and is heated by friction during operation of the motor.
In the case of the known electric motor, it is considered to be disadvantageous that the heat output is always output by the ball bearings via the ball bearing pot and via the gap pot to the motor housing and the external environment. In particular, the slotted can is an obstacle to efficient heat dissipation, since it is preferably made of plastic, so that the achievable efficiency of heat dissipation is limited and the electric motor can be operated only at a limited rotational speed to avoid thermal damage.
Disclosure of Invention
The object of the invention is therefore to improve the heat dissipation in the case of an electric motor of the type mentioned at the outset in such a way that thermal damage can be reliably avoided and the electric motor can be operated without damage at higher rotational speeds.
To achieve this object, the invention proposes various electric motors.
A first electric motor according to the invention of the type mentioned at the outset is characterized in that the outer ring of the rolling bearing is injected into the can and that the can region (into which the outer ring is injected) is in heat-conducting contact with the can end plate.
In the case of the electric motor according to the invention, the outer ring of the rolling bearing is in heat-conducting contact with the can cover plate of the can with the interposition (or called intervening, i.e. Zwischenlage) of only the can region into which the outer ring is injected, which ensures good heat dissipation. It is additionally advantageous here to achieve narrow positional tolerances and low production costs by means of bearings which are injected into the slot pot.
In order to further increase the heat dissipation in the case of the electric motor according to the invention, it is provided that the can region into which the outer ring of the rolling bearing is injected is of hollow-cylindrical design in its basic shape and that the can cover has a sleeve-like projection at its side facing the rolling bearing, which surrounds the hollow-cylindrical can region into which the outer ring is injected in a heat-conducting contact manner. This makes available a particularly large heat transfer surface between the region of the can into which the outer ring of the rolling bearing is injected and the can cover. Furthermore, the projection of the can cover plate is responsible for mechanically reinforcing and stabilizing the can region located in the projection (into which the outer ring of the rolling bearing is inserted).
In order to avoid undesired ingress of medium into the gap pot in the case of such an electric motor, it is proposed that the gap pot region into which the outer ring of the rolling bearing is introduced, which region is hollow-cylindrical in its basic shape, is closed in a sealing manner at its end face facing the gap pot cover by a gap pot cover mounted there. The can lid is expediently made of the same material, that is to say of the same plastic, as the remaining cans and is welded or glued or screwed to the remaining cans, for example.
In an alternative refinement of the electric motor, it is provided that a radial seal is arranged between the outer circumference of the slotted pot region, into which the outer ring of the rolling bearing is inserted, which is hollow-cylindrical in its basic shape, and the inner circumference of the projection. This also prevents undesired ingress of medium into the crevice pot.
In a further embodiment of the electric motor, the can region into which the outer ring of the rolling bearing is inserted is of hollow-cylindrical design in its basic shape, and the end face of the hollow-cylindrical can region facing the can cover rests in direct heat-conducting contact against the can cover. In this embodiment, too, good heat dissipation from the region of the can into which the outer ring of the rolling bearing is injected into the can cover plate acting as a cooling body is achieved.
In order to also reliably prevent the ingress of harmful media into the interior of the can in the case of such an electric motor, it is provided that an axial seal is arranged between the side of the can cover facing the rolling bearing and the end side of the hollow-cylindrical can region, into which the outer ring of the rolling bearing is inserted, facing the can cover. The seal can be a low-cost O-ring, for example.
The heat dissipation can be increased by the fact that the can cover plate is pulled in or pressed in the direction of the rolling bearing in a region thereof radially inside the end face of the hollow-cylindrical can region into which the outer ring of the rolling bearing is injected. In this way, the relevant region of the can cover reaches a small distance from the rolling bearing and from the end of the motor shaft supported therein, which provides additional heat dissipation by the rolling bearing and by the heat radiation from the shaft end to the can cover.
As a means for compensating tolerances and for avoiding the resulting deterioration of the heat dissipation, an axially elastic, heat-conducting intermediate piece is preferably arranged between the outer ring of the rolling bearing and the can cover.
A second alternative solution to the object set forth above is described immediately below.
The electric motor (with a stator formed by windings and with motor electronics, which are arranged in a slot pot made of plastic and sealed against the environment, with a rotor formed by magnets arranged on the motor shaft, with at least one rolling bearing supporting the motor shaft on the slot pot, with a slot pot cover serving as a cooling body adjacent to the motor electronics for dissipating heat from the motor electronics and with means for dissipating the heat generated during operation of the motor of the rolling bearing, wherein the means for dissipating heat comprise a metal rolling bearing pot which is encapsulated by the slot pot (or injection-molded, i.e. a rolling bearing pot) and which accommodates the rolling bearing) is characterized according to the invention in that the end wall of the rolling bearing pot facing the slot pot cover is in direct heat-conducting contact with the slot pot cover or with the region of the slot pot which is exposed to the environment via the recess in the slot pot cover.
In the case of this embodiment of the electric motor with a rolling bearing pot, good heat dissipation from the rolling bearing is likewise achieved, since the metallic rolling bearing pot can emit heat directly to the can cover plate which is in contact with it or directly to the outwardly exposed region of the can.
In a further embodiment of the electric motor, it is provided that, in order to avoid the ingress of harmful media into the gap pot, an axial seal is arranged between the side of the gap pot cover facing the rolling bearing and the end face of the hollow-cylindrical gap pot region (by which the rolling bearing pot is enclosed) facing the gap pot cover.
A contribution to achieving lower production costs in the case of such an electric motor is that the rolling bearing cartridge is preferably a drawn part made of sheet metal, preferably steel sheet.
A third alternative solution to the object set forth above is described immediately below.
The electric motor (stator formed by windings and motor electronic components arranged in a gap pot made of plastic and sealed with respect to the surroundings; rotor formed by magnets arranged on the motor shaft; rolling bearing with at least one rolling bearing supporting the motor shaft at the gap pot; gap pot cover plate acting as a cooling body adjacent to the motor electronic components for conducting away heat of the motor electronic components and means for conducting away heat of the rolling bearing generated during the operation of the motor) is characterized in that the means for conducting away heat of the rolling bearing comprise a rolling bearing sleeve which is surrounded by a hollow-cylindrical gap pot region and which accommodates the rolling bearing, and the rolling bearing sleeve is formed integrally and material-united with the gap pot cover plate.
In the case of this embodiment of the electric motor with a rolling bearing sleeve, good heat dissipation from the rolling bearing is likewise achieved, since the rolling bearing can emit its heat directly to the rolling bearing sleeve which surrounds and contacts it, which is a component of the gap pot cover.
In a further embodiment of the electric motor, it is provided to avoid the ingress of harmful media into the gap pot that a radial seal is arranged between the outer circumferential side of the rolling bearing sleeve facing away from the rolling bearing and the inner circumferential side of the gap pot region surrounding the rolling bearing sleeve facing the rolling bearing. Since the heat removal takes place here not via the region of the gap pot surrounding the roller bearing sleeve, the seal described here does not interfere with the heat removal.
In particular for tolerance compensation and for maintaining good heat dissipation even in the event of tolerances, it is preferably provided in the case of the electric motor that a spring ring is arranged between the outer circumferential side of the rolling bearing and the inner circumferential side of the rolling bearing sleeve.
In order to achieve a good heat dissipation from the can cover to the ambient air for all the electric motors described above, it is expedient if the can cover has a surface-enlarging structure, preferably cooling ribs, on its side facing away from the rolling bearing and directed toward the free surroundings, at least in the region close to the rolling bearing.
As explained above, any electric motor of the type considered here comprises motor electronics which, on the one hand, generate heat to be extracted via the slotted can cover, but which, on the other hand, must nevertheless be protected against the ingress of too much waste heat from the rolling bearing. For this purpose, the invention proposes that the can lid has at least one annular groove on its side facing away from the relatively free surrounding area of the rolling bearing and/or on its side facing the rolling bearing, which groove surrounds the region of the can lid close to the rolling bearing. The groove forms a resistance to heat conduction in the gap pot cover from the region close to the rolling bearing into the region close to the motor electronics, which prevents an undesired, harmful heat transfer from the rolling bearing to the motor electronics.
For good thermal conductivity and low-cost manufacturability, the slotted can cover plate is preferably a die-cast part made of metal, preferably aluminum, or an injection-molded part made of plastic, preferably filled, thermally conductive plastic.
Drawings
In the following, embodiments of the invention are explained with the aid of the figures. The figures of the drawings are correspondingly shown in schematic longitudinal section:
figure 1 shows an electric motor in a first embodiment,
figure 2 shows an electric motor in a second embodiment,
figure 3 shows an electric motor in a third embodiment,
figure 4 shows an electric motor in a fourth embodiment,
figure 5 shows an electric motor in a fifth embodiment,
figure 6 shows an electric motor in a sixth embodiment,
figure 7 shows an electric motor in a seventh embodiment,
FIG. 8 shows an electric motor in an eighth embodiment, an
Fig. 9 shows an electric motor in a ninth embodiment.
List of reference numerals
1. Electric motor
10. Stator (winding)
11. Rotor (magnet)
12. Motor shaft
13. Rolling bearing
13' 13 outer ring
14. Motor electronic component
2. Gap pot
20. Surrounding the area of the 13',5,6 slotted can
20' 20 end side
21. Sealing cover for gap pot
25. Exposed crevice pot area in 35
3. Gap tank cover plate
30. Fixing screw
31. Axial seal between 2 and 3
32. Projection in the form of a sleeve at 3
33. Radial seal between 20 and 32
34. Axial seal between 3 and 20
35. Notch part in 3
36. Draw-in or press-in section in 3
37. Surface-enlarged structures on 3
38. Groove in 3
39. Gap can cover plate area near rolling bearing
4. Intermediate parts between 3 and 13
5. Rolling bearing pot
50 5 end wall
6. Rolling bearing sleeve
60. A spring ring.
Detailed Description
In the following description of the figures, identical parts in different figures are provided with the same reference numerals throughout, so that it is not necessary for each figure to re-elucidate all reference numerals.
All figures of the drawings correspondingly show an electric motor 1 with a stator 10 formed by windings and with a rotor 11 formed by magnets arranged on a motor shaft 12. In addition, the electric motor 1 has motor electronics 14 in each case. The stator 10 formed by the windings and the motor electronics 14 are arranged in a can 2 made of plastic, which is sealed off from the environment, so that the electric motor 1 can be installed in an environment with corrosive media, which are harmful for the stator 10 and the motor electronics 14, for example crankcase ventilation gas of an internal combustion engine. At the upper end side in the drawing, the slot pot 2 is closed with a slot pot cover 3 adjacent to the motor electronics 14, which acts as a cooling body and which conducts heat away from the motor electronics 14. The can cover 3 is releasably connected to the remaining cans 2 by means of fastening screws 30 with the interposition of axial seals 31.
In addition, each electric motor 1 has at least one rolling bearing 13 which supports the motor shaft 12 at the slot pot 2.
Finally, each electric motor 1 described below has means for dissipating heat generated by the rolling bearing 13 during operation of the electric motor 1, wherein these means, which serve the same purpose, can be implemented differently, as explained below.
The illustrated electric motors 1 all have a generally circular basic shape, as seen in a top view not expressly shown in the drawings.
Figure 1 of the accompanying drawings shows an electric motor in a first embodiment. It is characteristic for the electric motor 1 that the can region 20, into which the outer ring 13 'of the rolling bearing 13 is injected into the can 2 and the outer ring 13' is injected, is in heat-conducting contact with the can cover 3. The gap pot region 20 into which the outer ring 13' of the rolling bearing 13 is inserted is of hollow-cylindrical design in its basic shape. The can lid 3 has, on its side facing the rolling bearing 13, a sleeve-like projection 32 which surrounds the hollow-cylindrical can region 20 into which the outer ring 13' is inserted in heat-conducting contact. The hollow-cylindrical can region 20 into which the outer ring 13 'of the rolling bearing 13 is inserted is sealed off in a sealing manner at its end face 20' facing the can cover 3 by a can cover 21 mounted there in order to hold the can 2 tightly in a sealing manner. The slot pot cover 21 is preferably made of the same plastic as the remaining slot pots 2 and is welded or glued to the latter, for example.
The dissipation of heat from the rolling bearing 13 is effected here via the can region 20 and the projection 32 to the can cover region 39 close to the rolling bearing, from where the heat is emitted to the ambient air.
Fig. 2 shows an electric motor in a second embodiment. In the case of this electric motor 1, in the case of a design otherwise corresponding to the example according to fig. 1, a radial seal 33 is arranged between the outer circumference of the can region 20, which is hollow-cylindrical in its basic shape, into which the outer ring 13' of the rolling bearing 13 is injected, and the inner circumference of the projection 32 of the can cover 3. Thus, the slit can closure present in fig. 1 is not required here.
The removal of heat from the rolling bearing 13 is effected in the same way as in the case of the example according to fig. 1.
Fig. 3 shows an electric motor in a third embodiment. Here, the outer ring 13' of the rolling bearing 13 is also inserted into the gap pot region 20, which is of hollow-cylindrical design in its basic shape. The end face 20' of the hollow-cylindrical can region 20, which faces the can cover 3, rests directly in heat-conducting contact with the can cover 3.
For sealing the gap pot 2, an axial seal 34 is arranged here between the side of the gap pot cover 3 facing the rolling bearing 13 and the end face 20 'of the hollow-cylindrical gap pot region 20 facing the gap pot cover 3, into which the outer ring 13' of the rolling bearing 13 is injected.
Furthermore, the can lid 3 has a pull-in or press-fit 36, which is directed in the direction of the rolling bearing 13, in its region radially inside the end face 20 'of the hollow-cylindrical can region 20 into which the outer ring 13' of the rolling bearing 13 is inserted.
The heat is conducted away from the rolling bearing 13 here on the one hand by heat conduction via the can region 20 into the can cover region 39 close to the rolling bearing and on the other hand by heat radiation from the upper end of the motor shaft 12 to the adjacent draw-in or press-in 36. The heat is then emitted from the region 39 of the can cover, which is adjacent to the roller bearing and has a pull-in or a press-in 36, to the ambient air.
Fig. 4 shows an electric motor 1 in a fourth embodiment. Here, again in accordance with the example according to fig. 3, the outer ring 13' of the rolling bearing 13 is injected or (which is alternatively possible here) pressed into the slotted pot region 20 which is hollow-cylindrical in its basic shape. The end face 20' of the hollow-cylindrical can region 20, which faces the can cover 3, is in turn in direct heat-conducting contact with the can cover 3.
In order to seal the gap pot 2, an axial seal 34 is also arranged here between the side of the gap pot cover 3 facing the rolling bearing 13 and the end face 20 'of the hollow-cylindrical gap pot region 20, into which the outer ring 13' of the rolling bearing 13 is injected, facing the gap pot cover 3.
In the case of this embodiment of the electric motor 1, it is important that at least one axially elastic, thermally conductive intermediate piece 4 is arranged between the outer ring 13' of the rolling bearing 13 and the gap pot cover 3. The intermediate part 4 has a double function here, since it ensures that it prevents undesired axial movements when the rolling bearing 13 is pressed in and it makes available a second way for the removal of heat from the rolling bearing 13.
The intermediate piece 4 can be embodied in one piece or (as shown in fig. 4) can also be composed of two, alternatively also more parts.
Fig. 5 shows an electric motor 1 in a fifth embodiment. The means for dissipating heat from the rolling bearing 13 here comprise a metallic rolling bearing pot 5 enclosed by the can 2, which accommodates the rolling bearing 13, with an end wall 50 here at the top. The rolling bearing 13 is pressed into the metallic and therefore mechanically stable rolling bearing pot 5.
The end wall 50 of the rolling bearing cartridge 5 facing the can end plate 3 is in direct heat-conducting contact with the can end plate 3 at its bottom.
The heat dissipation from the rolling bearing 13 is effected here via the metallic and therefore particularly well thermally conductive rolling bearing pot 5 to the gap pot cover region 39 close to the rolling bearing, from where the heat is emitted to the ambient air.
Fig. 6 shows an electric motor 1 in a sixth embodiment. The slot pot 2 is embodied here in a closed manner. In the gap pot cover 3, a central recess 35 is provided. In the dent portion 35, the uppermost region 25 in the center of the crevice tank 2 is flush with the tank lid panel surface. Here, as in fig. 5, the rolling bearing 13 is arranged in a rolling bearing pot 5 with an upper end wall 50. The end wall 50 of the rolling bearing pot 5 is directed upward and is in direct heat-conducting contact with the region 25 of the can 2 exposed to the environment via the recess 35 in the can cover 3.
For sealing the gap pot 2, an axial seal 34 is arranged here between the side of the gap pot cover 3 facing the rolling bearing 13 and the end face 20' of the hollow-cylindrical gap pot region 20 enclosed by the rolling bearing pot 5 facing the gap pot cover 3.
For low-cost mass production, the rolling bearing can 5 is preferably a drawn part made of a metal plate, preferably a steel plate.
The heat removal from the rolling bearing 13 is effected here via the metallic and therefore well heat-conducting rolling bearing pot 5 from its end wall 50 to the uppermost exposed region 25 of the slot pot 2, from where it is emitted to the ambient air.
Fig. 7 shows an electric motor 1 in a seventh embodiment, which largely corresponds to the example according to fig. 5.
In contrast, the surface of the gap pot cover 3 facing away from the rolling bearing 13 and directed toward the free environment has an enlarged surface structure 37, preferably a cooling rib, at least in its region 39 close to the rolling bearing. These structures 37 increase the heat emission to the ambient air, which results in improved cooling of the rolling bearing 13.
A further difference is that the can lid 3 has at least one annular groove 38 on its side facing away from the rolling bearing 13 and directed toward the free environment and/or on its side facing the rolling bearing 13, which groove surrounds a can lid region 39 close to the rolling bearing. This groove 38 forms a resistance to the heat conduction in the gap pot cover 3 from the region 39 close to the rolling bearing into the region close to the motor electronics 14, which prevents an undesired, harmful heat transfer from the rolling bearing 13 to the motor electronics 14.
The surface-enlarging structure 37 and/or the groove 38 at or in the slot pot cover 3 can be used in all the described cases of the electric motor 1.
Fig. 8 shows an electric motor 1 in an eighth embodiment. It is characteristic for this embodiment that the means for dissipating heat from the rolling bearing 13 here comprise a rolling bearing sleeve 6 which is surrounded by a hollow-cylindrical can region 20 and which accommodates the rolling bearing 13, and that the rolling bearing sleeve 6 is formed integrally and materially integrally with the can cover 3. In this case, the cup lid 3, in addition to its function as a cover for the cup 2 and its function as a heat sink, also assumes the function of a carrier for the rolling bearing 13, which results in a particularly high level of integration of the functions.
The heat is conducted away from the rolling bearing 13 here via the rolling bearing sleeve 6, which is formed in one piece with the can lid 3 in the region 39 of the can lid close to the rolling bearing, from where it is emitted to the ambient air.
Finally, fig. 9 shows an electric motor 1 in a ninth embodiment, which largely corresponds to the example according to fig. 8. In contrast, in the case of the example according to fig. 9, a radially elastic spring ring 60 is arranged between the outer circumferential surface of the outer ring 13' of the rolling bearing 13 and the inner circumferential surface of the rolling bearing sleeve 6. The spring ring 60 serves, on the one hand, to compensate for tolerances occurring and, on the other hand, to always maintain a good conductive thermal contact between the rolling bearing 13 and the rolling bearing sleeve 6.
Claims (21)
1. An electric motor (1) having a stator (10) formed by windings and having motor electronics (14) which are arranged in a slot pot (2) made of plastic which is sealed with respect to the surroundings; with a rotor (11) formed by magnets arranged on a motor shaft (12); with at least one rolling bearing (13) supporting the motor shaft (12) on the slot pot (2); with a slotted pot cover (3) adjacent to the motor electronics (14) which serves as a cooling body and which conducts away heat from the motor electronics (14), and with means for conducting away heat of the rolling bearing (13) which is generated during operation of the electric motor (1),
characterized in that a can region (20) into which an outer ring (13 ') of the rolling bearing (13) is injected into the can (2) and the can cover plate (3) is in heat-conducting contact, and in that the can region (20) into which the outer ring (13 ') of the rolling bearing (13) is injected is of hollow-cylindrical configuration in its basic shape and the can cover plate (3) has, at its side facing the rolling bearing (13), a sleeve-like projection (32) which surrounds the hollow-cylindrical can region (20) into which the outer ring (13 ') is injected in heat-conducting contact.
2. An electric motor (1) according to claim 1, characterized in that the outer ring (13') is in heat-conducting contact with the can lid (3) interposing only the can region (20).
3. An electric motor (1) as claimed in claim 2, characterized in that the can region (20) into which the outer ring (13 ') of the rolling bearing (13) is injected, which can region is hollow-cylindrical in its basic shape, is sealingly closed at its end face (20') facing the can cover (3) with a can closure (21) provided there.
4. An electric motor (1) according to claim 2, characterized in that a radial seal (33) is arranged between the outer circumference of the gap pot region (20) into which the outer ring (13') of the rolling bearing (13) is injected, which gap pot region is hollow-cylindrical in its basic shape, and the inner circumference of the projection (32).
5. An electric motor (1) as claimed in claim 1, characterized in that the slotted-pot region (20) into which the outer ring (13 ') of the rolling bearing (13) is injected is of hollow-cylindrical configuration in its basic shape and the end face (20') of the hollow-cylindrical slotted-pot region (20) facing the slotted-pot cover plate (3) bears directly against the slotted-pot cover plate (3) in heat-conducting contact.
6. An electric motor (1) according to claim 5, characterized in that an axial seal (34) is arranged between the side of the gap pot cover plate (3) facing the rolling bearing (13) and the end side (20 ') of the hollow cylindrical gap pot region (20) into which the outer ring (13') of the rolling bearing (13) is injected facing the gap pot cover plate (3).
7. An electric motor (1) according to claim 5 or 6, characterized in that the slotted-pot cover plate (3) has, in its radially inner region at the end side (20 ') of the hollow-cylindrical slotted-pot region (20) into which the outer ring (13') of the rolling bearing (13) is injected, a pull-in or press-in (36) directed in the direction towards the rolling bearing (13).
8. An electric motor (1) according to claim 2 or 5, characterized in that at least one axially elastic, heat-conducting intermediate piece (4) is arranged between the outer ring (13') of the rolling bearing (13) and the gap pot cover plate (3).
9. An electric motor (1) having a stator (10) formed by windings and having motor electronics (14) which are arranged in a slot pot (2) made of plastic which is sealed with respect to the surroundings; with a rotor (11) formed by magnets arranged on a motor shaft (12); with at least one rolling bearing (13) supporting the motor shaft (12) on the slot pot (2); with a slotted pot cover (3) serving as a cooling body adjacent to the motor electronics (14) for dissipating heat of the motor electronics (14) and with means for dissipating heat of the rolling bearing (13) generated during operation of the electric motor (1), wherein the means for dissipating heat comprise a metallic rolling bearing pot (5) enclosed by the slotted pot (2) and accommodating the rolling bearing (13),
characterized in that the end wall (50) of the rolling bearing cartridge (5) facing the gap-cartridge cover plate (3) is in direct heat-conducting contact with the gap-cartridge cover plate (3) or with a region (25) of the gap-cartridge (2) exposed to the surroundings via a recess (35) in the gap-cartridge cover plate (3).
10. An electric motor (1) according to claim 9, characterized in that an axial seal (34) is arranged between the side of the gap pot cover (3) facing the rolling bearing (13) and the end side (20') of the hollow-cylindrical gap pot region (20) facing the gap pot cover (3), the rolling bearing pot (5) being enclosed by the gap pot region (20).
11. An electric motor (1) according to claim 9 or 10, characterized in that the rolling bearing cartridge (5) is a drawn part consisting of sheet metal.
12. An electric motor (1) as claimed in claim 11, characterized in that the rolling bearing pot (5) is a deep-drawn part consisting of sheet steel.
13. An electric motor (1) having a stator (10) formed by windings and having motor electronics (14) which are arranged in a slot pot (2) made of plastic which is sealed with respect to the surroundings; with a rotor (11) formed by magnets arranged on a motor shaft (12); with at least one rolling bearing (13) supporting the motor shaft (12) on the slot pot (2); with a slotted pot cover (3) adjacent to the motor electronics (14) which serves as a cooling body and which conducts away heat from the motor electronics (14), and with means for conducting away heat of the rolling bearing (13) which is generated during operation of the electric motor (1),
the device for dissipating heat from the rolling bearing (13) is characterized in that the device comprises a rolling bearing sleeve (6) which is surrounded by a hollow-cylindrical can region (20) and which accommodates the rolling bearing (13), and in that the rolling bearing sleeve (6) is formed integrally and materially integrally with the can cover (3).
14. An electric motor (1) according to claim 13, characterized in that an axial seal (34) is arranged between the side of the can cover (3) radially outside the rolling bearing sleeve (6) facing the rolling bearing (13) and the end side (20') of the hollow-cylindrical can region (20) surrounded by the rolling bearing sleeve (6) facing the can cover (3), or a radial seal (33) is arranged between the outer circumferential side of the rolling bearing sleeve (6) facing away from the rolling bearing (13) and the inner circumferential side of the can region (20) surrounding the rolling bearing sleeve (6) facing the rolling bearing (13).
15. An electric motor (1) as claimed in claim 13 or 14, characterized in that a radially elastic spring ring (60) is arranged between the outer circumferential surface of the outer ring (13') of the rolling bearing (13) and the inner circumferential surface of the rolling bearing sleeve (6).
16. An electric motor (1) as claimed in claim 1, 9 or 13, characterized in that the gap pot cover (3) has a surface-enlarging structure (37) on its side facing away from the rolling bearing (13) and directed towards the free surroundings, at least in the region close to the rolling bearing.
17. An electric motor (1) according to claim 16, characterized in that the surface-enlarging structure (37) is a cooling rib.
18. An electric motor (1) according to claim 1, 9 or 13, characterized in that the slit-can cover plate (3) has at least one annular groove (38) surrounding a slit-can cover plate region (39) close to the rolling bearing on its side facing away from the rolling bearing (13) and directed towards the free surroundings and/or on its side facing the rolling bearing (13).
19. An electric motor (1) as claimed in claim 1, 9 or 13, characterized in that the gap pot cover (3) is an injection-molded part consisting of metal or an injection-molded part consisting of plastic.
20. An electric motor (1) according to claim 19, characterized in that the metal is aluminium.
21. An electric motor (1) according to claim 19, characterized in that the plastic is a filled, thermally conductive plastic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018132715.3A DE102018132715A1 (en) | 2018-12-18 | 2018-12-18 | Electric motor with at least one roller bearing supporting a motor shaft and with means for dissipating the heat of the roller bearing generated during operation of the motor |
| DE102018132715.3 | 2018-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111342595A CN111342595A (en) | 2020-06-26 |
| CN111342595B true CN111342595B (en) | 2023-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911307833.1A Active CN111342595B (en) | 2018-12-18 | 2019-12-18 | Electric motor with rolling bearing and device for dissipating heat from the rolling bearing |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111342595B (en) |
| DE (1) | DE102018132715A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021212109A1 (en) * | 2021-10-27 | 2023-04-27 | Zf Friedrichshafen Ag | Process for manufacturing a can for an electrical machine |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102018132715A1 (en) | 2020-06-18 |
| CN111342595A (en) | 2020-06-26 |
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