WO2018114099A1

WO2018114099A1 - Cooling jacket housing, in particular for an electric machine

Info

Publication number: WO2018114099A1
Application number: PCT/EP2017/077393
Authority: WO
Inventors: Stefan Brunhuber
Original assignee: Bayerische Motoren Werke Aktiengesellschaft
Priority date: 2016-12-20
Filing date: 2017-10-26
Publication date: 2018-06-28
Also published as: DE102016225521A1

Abstract

The invention relates to a housing (1), in particular for an electric machine, having a fluid inlet (7); a fluid outlet (8); and a cooling jacket (3; 103) which extends from the fluid inlet (7) to the fluid outlet (8), is formed in a housing wall, annularly surrounds a central axis (2) and through which fluid can flow; wherein the cooling jacket (3; 103) is subdivided into multiple cooling jacket segments (9, 10, 11; 109, 110, 111) which are adjacent to one another in the circumferential direction and each comprise a segment entrance (12, 13, 14; 112, 113, 114) and a segment exit (15, 16, 17; 115, 116, 117) for the fluid, and, at a first branch (22; 122) downstream of the fluid inlet (7), the fluid is divided into two partial flows which lead to different cooling jacket segments. The invention further relates to an electric machine having such a housing (1) and to a motor vehicle comprising such an electric machine.

Description

Cooling jacket housing, in particular for an electrical machine

The invention relates to a housing with a cooling jacket, an electric machine with such a housing and a motor vehicle with such an electric machine.

Electrical machines are known from the prior art, the stator of which is cooled by a cooling jacket surrounding the stator. The cooling jacket is formed by a meandering cooling channel through which a cooling medium flows. Such a cooling jacket cooling for an electric machine is known from EP 0 967 708 A2. In such cooling jacket cooling, however, a cooling effect in

Circumferential direction not evenly distributed, since the cooling effect on

Cooling medium input is greater than at the cooling medium output, since the cooling medium continuously absorbs heat energy on the way from the cooling medium inlet to the cooling medium output.

An object of the invention is a housing with a

to provide improved cooling jacket. This object is achieved with a housing according to claim 1, an electric machine according to claim 10 and a vehicle according to claim 1 1. advantageous

Further developments are the subject of the dependent claims.

According to one embodiment of the invention, a housing, in particular for an electrical machine, provided with a

Fluid inlet; a fluid outlet; one from the fluid inlet to the

Fluid outlet extending, formed in a housing wall cooling jacket which annularly surrounds a central axis (wherein "annular" on the cross-sectional plane perpendicular to the central axis refers) and fluid is flowed through, wherein the cooling jacket in a plurality of circumferentially (around the central axis) adjacent the cooling jacket Segments is divided by each of which has a segment inlet and a segment outlet for the fluid, wherein the fluid downstream of the fluid inlet at a first branch is divided into two sub-streams, which

lead different cooling jacket segments. The advantage of this

Embodiment is that by dividing into several

Cooling jacket segments, the cool fluid is divided before or at the beginning of the absorption of heat energy to several cooling jacket segments and thus the entry of the cool fluid (cooling medium) takes place despite a single fluid inlet at several points in the circumferential direction. In this way, seen in the circumferential direction, a more uniform cooling can be achieved.

According to a further exemplary embodiment of the invention, the cooling jacket segments have at least one first and second cooling jacket segment whose segment inputs are connected to the fluid inlet and whose segment outputs are connected to the fluid outlet, wherein the

Segment input of the second cooling jacket segment with diversion (in particular of the meandering cooling channel) of the first Kühlmantel- segment is connected to the fluid inlet and the segment output of the first cooling jacket segment with diversion (in particular of the meandering cooling channel) of the second cooling jacket segment with connected to the fluid outlet.

According to a further embodiment of the invention, the

Diversion realized in each case by means of a bypass line, the in

Circumferential direction runs.

According to a further embodiment of the invention, each cooling jacket segment has a meandering cooling channel, at one end of which the segment input of the cooling jacket segment and at the other end of the segment output of the cooling jacket segment are formed is. The meandering cooling channel distributes the fluid over a large area and with good surface utilization over the surface to be cooled.

According to a further embodiment of the invention, the meandering cooling channels of the cooling jacket segments are aligned so that each two adjacent, rectilinear sections are adapted to guide a fluid in the cooling channels in opposite directions, the rectilinear sections transversely, in particular perpendicular, to a

Are aligned circumferential direction.

According to a further embodiment of the invention, one of the part streams, downstream of the first branch, shares at a second

Branching turn into two partial streams, which lead to different cooling jacket segments. Thus, at least three cooling jacket segments are present, so that the cooling effect is even more evenly distributed in the circumferential direction.

According to a further embodiment of the invention, the housing is provided with a total of three cooling jacket segments, wherein in the

Circumferentially, the first, the second and a third cooling jacket segment are sequentially arranged in this order.

According to a further exemplary embodiment of the invention, the segment inlet of the first cooling jacket segment is connected to the fluid inlet and the segment outlet of the first cooling jacket segment is under

Redirection (in particular of the meandering cooling channel) of the second and third cooling jacket segment connected to the fluid outlet, and the segment input of the second cooling jacket segment with diversion (in particular of the meandering cooling channel) of the first cooling jacket segment connected to the fluid inlet and the segment Output of the second cooling jacket segment with diversion (in particular the

meandering cooling channel) of the third cooling jacket segment with the Fluid outlet associated, and further the segment input of the third cooling jacket segment with diversion (in particular of the meandering cooling channel) of the first and second cooling jacket segment with the

Fluid inlet connected and the segment output of the third cooling jacket segment connected to the fluid outlet.

According to a further embodiment of the invention, the fluid is a coolant or refrigerant. In particular, the coolant or refrigerant is a liquid.

In addition, the invention provides an electric machine with such a housing and a motor vehicle with such an electric machine.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. These drawings show:

FIG. 1 shows a three-dimensional view of a housing for an electrical machine according to an exemplary embodiment of the invention;

FIG. 2 shows a three-dimensional representation of a cooling jacket, in particular with regard to a first cooling jacket segment, according to an exemplary embodiment of the invention;

FIG. 3 shows a three-dimensional representation of the cooling jacket

FIG. 2 from another perspective, in particular with regard to a second cooling jacket segment; FIG. 4 shows a three-dimensional illustration of the cooling jacket from FIGS. 2 and 3 from a different perspective, in particular with regard to a third cooling jacket segment;

FIG. 5 shows a three-dimensional representation of the housing

Figure 1 with marked cooling jacket according to a

Embodiment of the invention;

FIG. 6 shows a three-dimensional representation of a cooling jacket, in particular with regard to a first cooling jacket segment, according to an exemplary embodiment of the invention;

FIG. 7 shows a three-dimensional representation of the cooling jacket

FIG. 6 from a different perspective, in particular with regard to a second and third cooling jacket segment;

FIG. 8 shows a three-dimensional representation of the cooling jacket from FIGS. 6 and 7 from a different perspective, in particular with regard to a third cooling jacket segment.

FIG. 1 shows a three-dimensional representation of a housing 1 for an electric machine according to an exemplary embodiment of the invention. The electric machine is an electromechanical converter, for example an electric motor or generator. The housing 1 is for example in

Essentially hollow cylindrical, wherein a central axis 2 of the housing 1 corresponds to a central axis of the hollow cylinder. The housing 1 is cast from metal, preferably aluminum. In the interior of the housing 1, a rotor (not shown) is rotatably mounted about the central axis 2, which (not shown) with a stationary relative to the housing 1 stator

interacts. In the housing wall of the housing 1, a cooling jacket is formed, which will be explained in more detail below. However, the cooling jacket does not necessarily have to be formed in the housing wall, but instead may also be formed as a separate component, which is arranged, for example concentrically, on the inside or the outside of the housing, for example, embedded in a hollow cylindrical member or in the form of non-embedded wires.

Figures 2 to 4 show three-dimensional representations of the cooling jacket 3 according to an embodiment from different perspectives. In particular, the figures show the shape of the cooling jacket 3, as this is embedded in the housing. This can be realized, for example, by a casting process by inserting a casting core in the form of the illustrations shown during casting of the housing 1 in the housing wall.

The cooling jacket 3 according to the invention is formed by cooling channels 4, 5, 6, into which a fluid can be introduced via a single fluid inlet 7, which fluid can be discharged from the cooling jacket 3 via a single fluid outlet 8 after flowing through the cooling channels. The fluid is a cooling or

Refrigerant, in particular in the form of a liquid, a cooling or

Refrigeration circuit. The cooling channels 4 to 6 of the cooling jacket 3 are arranged in the form of a hollow cylinder whose central axis corresponds to the central axis 2. The cooling jacket 3 is subdivided into a plurality of cooling jacket segments 9, 10 and 11, which are shown in different filling patterns in the figures. The cooling jacket segment 9 or the cooling channel 4 is provided with a hatching in the form of dashed lines, which runs in the figures 2 to 4 from bottom right to top left. The cooling jacket segment 10 or the cooling channel 5 is provided with a hatching in the form of continuous lines, which runs in the figures 2 to 4 from bottom right to top left. The cooling jacket segment 1 1 or the cooling channel 6 is provided with a hatching in the form of continuous lines, which extends in Figures 2 to 4 from bottom left to top right. Each cooling jacket segment 9, 10, 1 1 is formed by a, in particular meandering, cooling channel 4, 5, 6. Each of these meandering cooling channels 4, 5, 6 extends within one 3. A meander-shaped cooling channel course is preferred, however, the invention is not limited to this and other cooling channel courses are also possible, for example axially or in the circumferential direction (with respect to the center axis 2).

extending cooling duct sections, which are connected via cross connections. The meandering shape of the cooling channels 4, 5, 6 is achieved by in

Axial direction (with respect to center axis 2) extending, straight

Cooling duct sections whose longitudinal ends are alternately connected.

Each of these cooling jacket segments 9 to 1 1 has a segment input 12, 13, 14 and a segment output 15, 16, 17. More exactly forms one end of the cooling channel 4, 5, 6 of the respective cooling jacket segment 9, 10th , 1 1 the segment input 12, 13, 14 and the other end of the cooling channel 4, 5, 6, the segment output 15, 16, 17. The cooling jacket segments 9, 10, 1 1 are seen in the circumferential direction (with respect. Central axis 2) successively and adjacent to each other. Starting from the Fiuideiniass 7 of the cooling jacket 3 by a first cooling jacket segment 9, a second cooling jacket segment 10 and a third cooling jacket segment 1 1 is formed. However, the invention is not limited to three cooling jacket segments. The cooling jacket 3 could also be divided into two or more than three cooling jacket segments. All of the segment inputs 12, 13, 14 are connected to the

Fiuideiniass 7 connected and all of the segment outputs 15, 16, 17 are connected to the fluid outlet 8. This is achieved in that each of the segment inputs 12, 13, 14 with the diversion of the other cooling jacket segments, more precisely the meandering cooling channels of these other

Segments, or directly (i.e., without diverting or other intervening other cooling jacket segments) is connected to the Fiuideiniass 7. Likewise, each of the segment outputs 15, 16, 17 is bypassing the other cooling jacket segments, more specifically the meandering cooling channels of these other segments, or directly (i.e., bypass-free)

intervening other cooling jacket segments) is connected to the fluid outlet 8. This bypass is realized by bypass lines 18, 19, 20, 21, which in the circumferential direction within the hollow cylindrical shape of the Cooling jacket 3 run. Although the bypass lines are shown in the figures in the pattern of the cooling jacket segments, they are not to be regarded as part of the cooling jacket segments in the context of this description, but connect the cooling jacket segments with each other, with the fluid inlet 7 or the fluid outlet. 8

More precisely, a first branch 22 is provided downstream of the fluid inlet 7, which divides the fluid flow into two partial streams. One of the partial flows leads directly to the segment input 12 of the first cooling jacket segment 9. The other partial flow leads via the bypass line 18 to a second branch 23. The second branch 23 divides the partial flow of the bypass line 18 again into two partial flows, of which one leads directly to the segment input 13 of the second cooling jacket segment 10 and the other leads via the bypass line 19 to the segment input 14 of the third cooling jacket segment 1 1. About the cross-sectional design of the bypass lines 18 to 21 can be achieved by simple means a uniform division of the partial flows to the various cooling jacket segments. The segment output 15 of the first cooling jacket segment 9 leads via the bypass line 20 to a third branch 24, at which the segment output 16 of the second cooling jacket segment 10 and the bypass line 20 are brought together and via the bypass line 21 on to a fourth Branching 25 are led at the the

Bypass line 21 is merged with the segment output 17 of the third cooling jacket segment 1 1 and guided to the fluid outlet 8.

Of course, in the context of this invention, the flow direction can also be reversed, so that the reference numeral 7 denotes a fluid outlet and the reference numeral 8 denotes a fluid inlet.

Figure 5 shows a three-dimensional view of the housing 1 of Figure 1, wherein in Figure 5, the embedded in the housing wall cooling jacket is indicated. The indicated in Figure 5 cooling jacket corresponds to the principle described above, but is compared to that in the Figures 4 to 6 cooling jacket 3 shown slightly modified. This modified cooling jacket 103 will be explained in more detail below with reference to FIGS. 6 to 8, with only differences to the cooling jacket 3 described above being described. Incidentally, in order to avoid repetition, reference is made to the description of the cooling jacket 3.

The cooling jacket 103 is likewise subdivided into three cooling jacket segments. However, a first branch 122 is not arranged like the branch 22 directly at the fluid inlet 7, but further downstream. So is the case

Cooling jacket 103 between the fluid inlet 7 and the first branch 122 a meandering cooling channel 126 is interposed. This has installation space technical advantages. The first branch 122 divides the fluid flow from the fluid inlet 7 into two partial streams. One of the partial flows leads directly to the segment input 1 12 of the first cooling jacket segment 109. The other part ström leads via the bypass line 1 18 to a second

Branching 123. The second branch 123 divides the flow part of the bypass line 1 18 again into two partial flows, one of which leads directly to the segment input 1 13 of the second cooling jacket segment 1 10 and the other via the bypass line 1 19 to the segment Input 1 14 of the third cooling jacket segment 1 1 1 leads. The segment output 15 of the first cooling jacket segment 109 leads via the bypass line 120 to a third branch 124, at which the segment output 16 of the second cooling jacket segment 110 and the bypass line 120 are brought together and continue via the bypass line 121 be led to a fourth branch 125, at which the bypass line 121 are merged with the segment output 1 17 of the third cooling jacket segment 1 1 1 and fed to the fluid outlet 108.

While the invention in detail in the drawings and the

While the foregoing description and description has been presented and described, this illustration and description is to be considered as illustrative or exemplary, and not restrictive, and is not The invention is intended to be limited to the disclosed embodiments. The mere fact that certain features are in

various dependent claims should not indicate that a combination of these features could not be used to advantage.

Claims

claims

1 . Housing (1), in particular for an electrical machine, with

a fluid inlet (7);

a fluid outlet (8);

a cooling jacket (3; 103) extending in a housing wall extending from the fluid inlet (7) to the fluid outlet (8) and annularly surrounding a central axis (2) and permeable by fluid; wherein the cooling jacket (3; 103) is subdivided into a plurality of circumferentially adjacent cooling jacket segments (9, 10, 1 1; 109, 1 10, 1 1 1), each of which has a segment inlet (12, 13, 14 1 12, 1 13, 1 14) and a segment outlet (15, 16, 17; 1 15, 1 16, 1 17) for the fluid,

wherein the fluid downstream of the fluid inlet (7) at a first branch (22; 122) is divided into two sub-streams leading to different cooling jacket segments.

2. housing (1) according to claim 1, wherein the cooling jacket segments (9,

10, 1 1; 109, 1 10, 1 1 1) have at least one first and second cooling jacket segment (9, 10; 109, 110) whose segment inputs (12, 13; 1 12, 1 13) communicate with the fluid inlet (7). and whose segment outputs (15, 16, 1, 15, 16) are connected to the fluid outlet (8), wherein the segment inlet (16, 16) of the second cooling jacket segment (10; the segment output (15, 15) of the first cooling jacket segment (9, 109) is diverted with the second cooling jacket segment (10, 11, 10) being diverted to the first cooling jacket segment (9; ) is connected to the fluid outlet (8).

3. housing (1) according to claim 2, wherein the diversion is in each case by means of a bypass line (18, 19, 20, 21, 1 18, 1 19, 120, 121) is realized, which extends in the circumferential direction. Housing (1) according to one of the preceding claims, wherein each cooling jacket segment (9, 10, 1 1, 109, 1 10, 1 1 1) has a meandering cooling channel (4, 5, 6), at one end of the segment Input (12, 13, 14; 1 12, 1 13, 1 14) of the

Cooling jacket segment and at the other end of the segment output (15, 16, 17, 1 15, 1 16, 1 17) of the cooling jacket segment is formed.

Housing (1) according to claim 4, wherein the meandering

Cooling channels (4, 5, 6) of the cooling jacket segments (9, 10, 1 1, 109, 1 10, 1 1 1) are aligned so that in each case two adjacent, rectilinear sections are adapted, a fluid in the cooling channels (4 , 5, 6) in opposite directions, the rectilinear portions being oriented transversely to a circumferential direction.

Housing (1) according to one of the preceding claims, wherein one of the partial flows, downstream of the first branch (22; 122), at a second branch (23; 123) in turn divided into two partial flows, which to different cooling jacket segments (10 , 1 1, 1 10, 1 1 1) lead.

Housing (1) according to one of the preceding claims, with a total of three cooling jacket segments (9, 10, 1 1; 109, 1 10, 1 1 1), wherein in the circumferential direction the first, the second and a third cooling jacket segment ( 9, 10, 11, 109, 110, 11) are arranged one after another in this order.

Housing (1) according to claim 7, wherein

the segment input (12; 1 12) of the first cooling jacket segment (9; 109) is connected to the fluid inlet (7) and the segment outlet (15) of the first cooling jacket segment (9) is diverted the second and dntten cooling jacket segment (10, 1 1, 1 10, 1 1 1) is connected to the fluid outlet (8),

the segment input (13; 1 13) of the second cooling jacket segment (10; 1 10) is connected to the fluid inlet (7) while bypassing the first cooling jacket segment (9; 109) and the segment output (16; 16) of the second cooling jacket segment (10, 1 10) under

Diverting the third cooling jacket segment (1 1, 1 1 1) is connected to the fluid outlet (8), and

the segment input (14; 1 14) of the third cooling jacket segment (1 1; 1 1 1) is connected to the fluid inlet (7) while redirecting the first and second cooling jacket segments (9, 10; 109, 110) and the segment exit (17; 1 17) of the third cooling jacket segment (1 1; 1 1 1) is connected to the fluid outlet (8).

9. Housing (1) according to one of the preceding claims, wherein the fluid is a coolant or refrigerant.

10. Electrical machine with a housing (1) according to one of the preceding claims.

1 1. Motor vehicle with an electric machine according to claim 10.