WO2017071970A1

WO2017071970A1 - Cooling housing for an electric machine and production method therefor

Info

Publication number: WO2017071970A1
Application number: PCT/EP2016/074701
Authority: WO
Inventors: Marcus Meyer; Nico SAREMBA; Georg Kruse; Hanno Jelden
Original assignee: Volkswagen Aktiengesellschaft
Priority date: 2015-10-28
Filing date: 2016-10-14
Publication date: 2017-05-04
Also published as: CN108292878A; DE102015221115A1; KR20180073583A; CN108292878B; EP3369159A1

Abstract

The invention relates to a cooling housing for an electric machine, comprising a main body (2) for accommodating the electric machine (10), wherein at the main body (2) has a recess (24) on the outer surface (21) of the main body (2), which recess (24) expands in the peripheral direction of the main body (2), and a bent lateral element (3) that is mechanically coupled to the main body (2). The bent lateral element (3) has a first front face (32), a second front face (33) that is spaced apart from the first front face (32) by a lateral surface (31) of the lateral element (3), and a gap (34) running along a connection line extending on the lateral surface (31) between the first front face (32) and the second front face (33) of the lateral element (3), and that is fixed by way of a first connection edge (340) and a second connection edge (341) located opposite the first connection edge (340). The first connection edge (340) and the second connection edge (341) of the lateral element (3) are fluid-tightly coupled to each other and/or to the main body (2), whereas the lateral element (3) covers the recess (24) in the main body (2) and rests against the main body (2).

Description

description

"Cooling housing for an electrical machine and manufacturing method for such a"

The invention relates to a cooling housing for an electrical machine, for example for an electrical machine of a motor vehicle, and a method for producing a

Cooling housing for an electrical machine, for example for an electrical machine of a motor vehicle.

Housings for electrical machines are subject to numerous functional and mechanical requirements, which they must meet reliably over the entire life of the electrical machine. To dissipate the resulting power loss in the stator and rotor, electrical machines (electric motors) are cooled by a circulating cooling jacket, which is part of the housing of the electric machine (e-machine housing). This cooling jacket is usually integrated on the vehicle side in the cooling circuit and is flowed through by a water-glycol mixture. Therefore, it is important that the cooling jacket be sealed inward toward the electric machine and outwardly throughout the life of the electric machine. In addition to the tightness of the cooling jacket are in the

Conception of e-machine housings the costs, the weight and the space requirements important criteria.

It is known to assemble housings for electrical machines from several parts, wherein the cooling jacket is produced by the connection of the individual parts ("built-up cooling jacket").

For example, the housing may comprise a two-part stator support having a cooling structure and a pipe section covering the cooling structure and connected in a fluid-tight manner to a stator support. However, such housings have a plurality of sealing points, in particular concept-related, inner sealing points in the direction of the electrical

Machine on which laborious, for example, seals, adhesives or welds, must be sealed. It can often lead to leaks, especially in

Direction of the electric machine come, which can not be removed or only by hand, which means a high production cost. DE 10 2010 042 259 A1, DE 10 2010 040 399 A1 and DE 10 2006 044 785 A1 each propose a housing for an electrical machine, which has a cylindrical stator carrier and a tube which is plugged onto the stator carrier and connected thereto, so that the tube covers a cooling structure in the stator carrier liquid-tight. The stator must be made very precise that the tube can be plugged onto the stator and liquid-tight can be connected to the stator.

Alternatively, one-piece molded casings are known ("cast cooling jacket"), which are produced by means of a generally lost core forming a structure of the water jacket, but the manufacturing process is complex and costly.

Object of the present invention is therefore to provide a cooling housing for an electrical

To provide a machine and a method for producing a cooling housing for an electric machine, which at least partially overcome the disadvantages mentioned above. In particular, a favorable and simple housing concept is to be provided which manages without a lost core and avoids potential cooling water leaks, in particular in the direction of the electrical machine.

This object is achieved by the cooling housing according to the invention for an electrical machine according to claim 1 and the method for producing a cooling housing for an electrical machine according to claim 9.

According to a first aspect, the invention relates to a cooling housing for an electrical

Machine comprising:

a base body for receiving the electric machine, wherein the main body has in its outer surface an expanding in the circumferential direction of the base body recess; and

a bent shell member mechanically coupled to the base body, the bent shell member having a first end face, one through a shell surface of the shell

Sheath element spaced from the first end face, second end face and a

Has interruption extending along a running on the mantle surface

Connecting line between the first end side and the second end side of the jacket member extends and through a first terminal edge and one of the first terminal edge

opposite, second terminal edge is set, wherein the first terminal edge and the second terminal edge of the jacket element

mechanically and / or mechanically coupled to the base body, while the jacket element covers the recess in the base body and rests against the base body.

According to a second aspect, the present invention relates to a method for producing a cooling housing for an electrical machine, in particular a cooling housing according to one of the preceding claims, comprising:

Providing a base body for receiving the electric machine, wherein the main body in its outer surface in a circumferential direction of the main body

has expansive recess;

Providing a bent shell member having a first end face, a second end face spaced from the first end face by a shell surface of the shell member, and an interruption extending along one of the shell surface

extending connecting line between the first end side and the second end side of the jacket member and extends through a first terminal edge and one of the first

Terminal edge opposite, second terminal edge is fixed;

Laying the jacket element on the base body such that the jacket element the

Covering recess; and

fluid-tight mechanical coupling of the first terminal edge and the second terminal edge of the shell element to each other and / or with the base body, while the shell element covers the recess in the base body and rests against the base body.

Further advantageous embodiments of the invention will become apparent from the subclaims and the following description of preferred embodiments of the present invention.

A cooling housing according to the invention for an electrical machine comprises a base body for receiving the electrical machine, for example a stator support, and a bent, in particular elastic, jacket element, for example a jacket sheet, which is mechanically coupled to the base body. In its outer surface, the main body has a recess which expands in the circumferential direction of the main body, which recess is designed in particular such that it can be flowed through by cooling liquid. The curved one

Sheath element, in particular after it is placed around the base body and before and / or after it is coupled to the base body, has a first end face, a second end face spaced from the first end face by a jacket surface of the jacket element and an interruption. The interruption extends along one on the

Cloak surface extending connecting line between the first end side and the second Front side of the jacket member and is defined by a first terminal edge and one of the first terminal edge opposite, second terminal edge. The first

The connecting edge and the second connecting edge of the jacket element are mechanically and / or mechanically coupled to the base body in a fluid-tight manner, wherein the mechanical coupling of the first connecting edge and the second connecting edge to each other and / or with the

Base body takes place while the jacket element, the recess in the base body covering is placed around the body and rests against the body.

Since the connecting edges are only mechanically coupled, as soon as the jacket element is placed on the outside around the base body, the jacket element can be coupled in a simple manner fluid-tight to the base body independently of a shape of the base body. Thus, any one-piece body can be used. In addition, a coupling, in particular a welded joint, can be automated and produced in one operation, with good accessibility from the outside. Should leaks in the fluid-tight coupling between the base body and the jacket element or between the

Connection edges of the jacket element occur, these can be recognized, since they occur outwardly and thus are visible, so that a simple reworking is possible.

The electric machine may be an electric machine of a motor vehicle, for example a starter-generator, an electric booster and / or an electric motor

Drive motor. Alternatively, the electric machine may be an industrial electric machine or an industrial electric machine.

In some embodiments, the jacket element may have a first end side edge on the first end side and a second end side edge on the second end side.

Preferably, the first end side edge and the second end side edge with the

Basic body fluid-tight mechanically coupled. If appropriate, the jacket element can also have transitional edges between the front side edges and the connecting edges, which can likewise be coupled in a fluid-tight manner to the base body. Thus, the entire recess in the body along an outer edge of the jacket member can be covered fluid-tight.

The main body may be in the form of a hollow cylinder-like element. The hollow cylinder-like element may be open at both end faces or be open at one end face and closed at the other end face, that is to say be pot-shaped. The

hollow cylindrical element may have an inner side, the one in particular circular cylindrical cavity for receiving the electrical machine sets. The hollow cylinder-like element may have an outer side whose basic shape corresponds to a lateral surface of a geometric cylinder whose base is, for example, circular, oval, elliptical or polygonal with rounded edges and / or with rounded corners. In the outside of the recess is provided.

The recess may in particular have a uniform depth in the circumferential direction, in particular if the basic shape of the lateral surface of a geometric cylinder with a circular base area (circular cylinder) corresponds. Alternatively, the depth of the recess may vary in the circumferential direction, for example, if the basic shape of the lateral surface of a geometric cylinder having an oval or elliptical base or a polygonal base corresponds to round edges and / or with rounded corners. In these cases, the depth of the recess in areas of the base surface which have a minimum curvature can be maximum.

On its outside, the hollow cylindrical element next to the recess, which is preferably positioned centrally in the longitudinal direction of the hollow cylindrical member, one or more protruding from the outside connecting elements for fixing the electric machine in the housing and / or for incorporating the cooling housing in a drive system. The connection elements are preferably outside the

Recess, in particular adjacent to the longitudinal ends of the hollow cylinder-like

Elements, arranged. The connection elements can be designed as screw jack, ribs and / or similar connection structures. For example, the

Connection elements may be provided to attach a bearing plate or other component for fixing the electric machine to the housing and / or to couple the electric machine with a transmission or other drive component of the drive system. Since the jacket element has the interruption and therefore can be spread apart in particular elastically during joining to the base body, it can be attached to the

Connection elements and similar interference contours are passed axially.

The main body may be formed in one or more parts. Preferably, the

Base body integrally formed or has a central, coreless main part, which contains the entire recess, so that in the areas facing the electrical machine no sealing points, in particular no welds, bonds or seals are. As a result, leaks in the direction of the electric machine of avoided in the first place and the electric machine is effectively in front of the cooling medium

(Coolant) protected.

The main body or the central main part can be manufactured as a cast part, for example as a chill cast part, die cast part or other cast part. The main body can contain zinc, aluminum, copper, nickel, iron, titanium and / or another metal or consist of one or more of these metals. The base body may alternatively or additionally contain or consist of an aluminum alloy, a copper alloy such as brass or silicon tombac or another alloy.

The jacket element can be formed in one or more parts. Preferably that is

Sheath element integrally formed, since so improves the automation and the

Handling effort can be minimized.

In some embodiments, the interruption of the jacket element may extend from the first end side to the second end side of the jacket element. The first end face may be open, partially open or closed, while the second end face is open. The jacket element may, for example, have the shape of a hollow cylinder sector or a hollow cylinder sector with rounded transition areas or with transitional edges between the front side edges and the connecting edges. Alternatively, the jacket element may be a planar element with an outline in the form of a rectangle or a rectangle with rounded corners, which when applied to the base body and / or coupling the shell element to the base body to a hollow cylinder sector or a hollow cylinder sector with rounded transition areas between the front side edges and the terminal edges is formed.

The jacket element is advantageously flexible and / or elastic. The shell element can then simply lay around the base body and is not in the form of a

Pipe section attached to the body.

The sheath member may contain or consist of a metal, for example aluminum and / or another metal, or an alloy, for example an aluminum alloy, a copper alloy or another alloy. Alternatively, the sheath element may contain or consist of a plastic, for example polyvinyl chloride (PVC) and / or another plastic. The shell element may be a sheet metal, for example a flat finished roll product, made of metal, an alloy or plastic, before and / or after the coupling of the shell element with the base body about a longitudinal axis to a hollow cylinder sector or to a hollow cylinder with rounded transition areas between the end side edges and the connecting edges is bent. For example, the sheet may be a sheet metal from the body shop or a longitudinally slit and bent pipe section, which are available at low cost.

The jacket element, in particular the metal sheet, can have a thickness in the range from 1 mm to 5 mm, in particular from 2 mm to 3 mm.

The fluid-tight mechanical coupling can be a cohesive connection, for example a soldering, welding or adhesive connection. Alternatively, the fluid-tight mechanical coupling by means of a separate seal, in particular a

Rubber seal, such as an O-ring done. It is also possible that the fluid-tight mechanical coupling is realized in some areas as a cohesive connection and in other areas by means of a separate seal.

The welded joint may be a welded joint, which by means of a

Welding process is used, which uses additional weld metal, for example by means of a MIG welding process (metal welding with inert gases). However, the weld can also be used with other welding methods, such as

Beam welding process to be produced. Optionally, the weld can be further processed.

In some embodiments, the base body may have a separating web which interrupts the recess in the circumferential direction of the main body, wherein the first connecting edge and the second connecting edge of the jacket element are mechanically fluid-tightly coupled to the separating web. The connecting edges can be easily coupled to the divider due to better accessibility, in particular welding. In particular, the elongation of the jacket element caused by a welding process in the circumferential direction can be compensated for by a provision on the welding joint of the separating web.

Preferably, the separating web extends parallel to a longitudinal axis of the main body. Alternatively, the divider can also along a helical line with great slope over extend an extension of the recess in the longitudinal direction of the body. The slope can be 1 or more.

The divider can be formed integrally with the base body. For example, the divider can be a molded divider. Alternatively, the separating web may be formed as a separate separating web, which is inserted into the recess and in the region of

Recess is connected to the base body. Preferably, the separating web in the region of the recess is fluid-tight welded, soldered or glued to the base body.

Does the outside of the body have a basic shape different from that of the body?

Mantle surface of a circular cylinder differs, the divider can be arranged in a region in which the base surface of the basic shape of the outer side of the body forming lateral surface of the cylinder has a minimum curvature.

A height of the separating web may correspond, for example, to a depth of the recess, in particular a maximum depth of the recess, in the main body or may be smaller than this. The connecting edges of the jacket element can each be coupled in areas near the recess with the divider, so that there is a visible divider. Alternatively, the jacket element can span the base body along the entire circumference of the base body, so that the separating strip lies below a connection of the connecting edges and is completely covered by the jacket element.

In some embodiments, the separating web may have, in an outer surface of the separating web, a first passage opening, which opens into the recess of the main body. The first passage opening may be a supply opening for supplying cooling liquid into the recess or a discharge opening for discharging cooling liquid from the recess. The first passage opening may have a circular diameter in the region of the outer surface and may change in the region of the recess to form a wide slot which opens into the recess.

In some embodiments, the separator may have in its outer surface a second passage opening, which opens into the recess, wherein the first

Through opening and the second passage opening open at opposite edges of the divider in the recess. For example, the first through-opening may be a supply opening for supplying cooling liquid into the recess and the second

Through opening a discharge opening for discharging cooling liquid from the recess. The second passage opening can likewise have a circular diameter in the region of the outer surface and can change in the region of the recess to form a wide slot which opens into the recess.

Since the Durchgangsoffnungen open at opposite edges of the divider in the recess, the divider serves in addition to the simplified coupling of the jacket element to the body and the separation of hot and cold water.

Additionally or alternatively, the main body can one or more further

Having Durchgangsoffnungen that connect the outside of the body, in particular in the region of the longitudinal ends of the body with the recess. The jacket element may also have passage openings which extend from an outside of the

Open jacket element in the recess. The Durchgangsoffnungen in the main body and / or in the shell element can turn for the supply and / or discharge of

Coolant be provided.

Each of the passage openings can be provided with a connection. The nozzle can be screwed or inserted into the passage opening, for example, hammered and / or welded to the passage opening to be.

The divider can also have one or more channels which extend between the flanks of the divider and allow a flow of cooling fluid through the divider in the circumferential direction of the body.

In some embodiments, the main body can have a recess bordering the recess for placing the jacket element. The support border may be the preparation of the mechanical coupling between the shell element and the

Serve basic body. Due to the support border, the coupling between the

Sheath element and the body simplified and improves the quality of the fluid-tight coupling.

If the base body has a separating web, the support border can also extend along the separating web. The support border in the region of the separating web can thus support the connecting edges of the jacket element, so that the connecting edges can be easily coupled to the separating web. The jacket element preferably has one Shape, which corresponds to a contour of the Auflageumrandung on a side facing away from the recess side of the support border.

The support border may for example be embedded in the outside of the body. The support border may have a depth that corresponds to a thickness of the shell element or is less than the thickness of the shell element. Alternatively or additionally, the support border can be formed by a bead on the outside of the base body, which rotates the recess at a predetermined distance. The bead may have a height equal to or less than the thickness of the shell member. Is the

Supporting edge formed by a combination of a recess and a bead on the outside of the body, a sum of the depth of the recess and the height of the bead of the thickness of the shell member may be equal to or less than this.

In some embodiments, the recess of the base body may have a cooling structure. The cooling structure may, for example, have cooling ribs and / or cooling knobs. The cooling ribs and / or cooling knobs may be aligned or arranged along the circumferential direction or may be arranged meander-shaped in the recess. A height of the cooling ribs may be selected so that the jacket element, when it bears against the base body, is spaced from the cooling ribs and / or cooling knobs or rests on the cooling ribs and / or cooling knobs. The cooling fins and / or cooling knobs can also

have different heights. For example, a height of the cooling fins and / or cooling knobs may be smaller than the depth of the recess or correspond to this.

The cooling structure serves to improve the cooling performance and increase the strength of the body. It increases the effective cooling surface in the direction of the cooling medium and significantly contributes to an improvement in the rigidity against bending and tangential stresses. It also ensures targeted guidance of the cooling medium. By a rough

Cast surface can also be promoted turbulent surface flow and the heat transfer between the inner cooling jacket and the cooling medium can be improved, whereas by a smooth surface of the jacket element, the flow losses can be minimized.

If a separating web is provided, collecting areas can be provided in one or more regions of the recess, which adjoin the flanks of the separating web, and which are free of cooling ribs and / or cooling knobs, so that there is an inlet and outlet side

Cross-flow can take place. So can coolant over the entire extent of the Distribute the recess in the longitudinal direction of the base body and flow through the recess in the circumferential direction. Subsequently, the cooling liquid in the

Collect collection area adjacent to the other edge of the divider and exit via the passage opening from the recess. The collecting areas may preferably be provided in areas of the recess whose depth in the circumferential direction is at most or at least greater than a minimum depth of the recess in the circumferential direction. As a result, large collection areas can arise, which allow an optimal distribution of the cooling medium parallel to the longitudinal axis of the body.

In some embodiments, the recess may have a support structure which serves as a support of the jacket element. The support structure may, for example, support ribs and / or support knobs, whose height is selected so that the shell element, when it rests against the base body, rests on the support ribs and / or support knobs. The support ribs and / or support knobs are preferably aligned along the circumferential direction of the base body, but may also be arranged meander-shaped in the recess.

The support structure serves to improve the dimensional stability of the jacket element after welding and to avoid acoustic conspicuities due to an undefined or alternating contact between the jacket element and the cooling structure. On the support structure, the jacket element can be clamped before the welding process, so that defined contact points arise in the region of the cooling jacket, between the lateral welds. Due to the expansion during welding and the subsequent contraction of the shell element in a cooling phase, a tension can be further increased. The support structure can divide the cooling jacket into circumferential cooling channels, each with a cooling structure.

Optionally, selected or all cooling fins and / or cooling knobs can also serve as support ribs and / or support knobs or serve the support ribs and / or support knobs as cooling fins and / or cooling knobs.

The cooling housing may have a plurality of recesses which are interrupted by a corresponding number of separating webs from each other. The recesses may be covered in a fluid-tight manner by a single jacket element component. Alternatively, each one

Recess or a group of recesses of one each

Sheath element component to be covered fluid-tight. The dividers may be formed as stated above. Does the outside of the body have a basic shape on, which differs from the lateral surface of a circular cylinder, the separating webs may be arranged in areas in which the base of the basic shape of the

Outside of the main body forming lateral surface of the cylinder has minimal curvatures.

The cooling housing may further comprise a bearing shield system, which may comprise a bearing plate and a bearing plate cover. For example, the end shield system can be connectable to the end face of the main body.

The present invention further relates to a heat exchanger, in particular tube or tube heat exchanger, which is designed as the above-described cooling housing for the electric machine.

The present invention further relates to an electrical machine having a stator, a rotor and a cooling housing according to the invention, wherein the cooling housing is shrunk onto the stator. In addition, the present invention relates to a drive system with such an electric machine, which is coupled to a transmission, and a motor vehicle with such an electric machine.

The present invention further relates to a method for producing a cooling housing for an electrical machine, in particular a cooling housing, as described above.

According to the method, first of all a base body, for example a stator carrier, is provided for receiving the electric machine, which has in its outer surface a recess which expands in the circumferential direction of the base body. The main body may be formed as described above in detail with respect to the cooling housing. For providing a base body, a casting method may be used, for example, a die casting method, a die casting method or another casting method. Alternatively, the base body can also be provided from a blank by machining. The provision may also include merely providing a previously formed stator support.

In addition, a bent jacket member, such as a jacket sheet, the

is particularly elastic, provided. The bent jacket element has a first end face, one through a jacket surface of the jacket element from the first end face spaced, second end face and an interruption, which extends along a running on the lateral surface connecting line between the first end side and the second end side of the jacket member and by a first terminal edge and one of the first terminal edge opposite, second terminal edge is fixed. The

Sheath member is formed as described above in detail with respect to the cooling housing. To provide the jacket element, for example, a sheet metal of metal or plastic can be cut to size and optionally to a

hollow cylindrical sector-like jacket element to be bent.

Subsequently, the jacket element is placed on the base body such that the

Sheath element covers the recess. For this purpose, the cut sheet metal around the

Base body are bent around or the hollow cylinder sector-like jacket element spread and wrapped around the body. If the main body has a bearing border, then the jacket element can preferably be positioned such that the end side edges and, if the base body also has a separating web, also the

Seating edges and possibly the transition edges rest on the support edge.

Furthermore, while the jacket element covers the recess in the base body and bears against the base body, the first connection edge and the second connection edge of the jacket element are mechanically and / or mechanically coupled to the base body in a fluid-tight manner. In addition, the front side edges and possibly the transition edges of the jacket element can be mechanically coupled fluid-tightly to the base body.

In some embodiments, the jacket element can be coupled in a fluid-tight manner to the base body by being bonded to the base body in a material-tight manner,

For example, welded, soldered or glued. Preferably, a can

Welding process are used, which uses additional weld metal, for example, a MIG welding process (metal welding with inert gases). Welding process with additional weld metal allows a good weld entry

Spaltüberbrückbarkeit even with unfavorable tolerances and thus also an improved sealing effect compared to welding process without additional weld metal, such as beam welding process. The welding process preferably takes place on a cast blank, so that any delay due to a heat input can be compensated later by a final, machining. Alternatively, the jacket element can also be connected to the base body by means of a separate seal, for example a rubber seal such as one or more O-rings.

If the base body has a separate separating web, the method may further comprise providing the separating web and connecting the separating web to the main body in the region of the recess. The separate separating web can, for example, be cast and / or produced by machining. The divider can with the

Base body, for example, welded, soldered or glued.

According to the method, in the base body, in particular the separating web, and / or the jacket element further one or more through holes for supplying and / or discharging cooling liquid can be formed, which are optionally provided with a connecting piece.

The tightness of the recess covered with the jacket element is preferably tested after the coupling of the jacket element with the base body. If it turns out that leaks exist along the sealing points, the sealing points are reworked, for example by welding. Due to the external weld seams occurring defects can be easily detected and reworked, for example by the seam is locally liquefied to close pores with the resulting melt. For this purpose, any welding method can be used, preferably a TIG welding process (tungsten inert gas welding process).

According to the method, the cooling housing may preferably be after the fluid-sealing

Coupling of the jacket element with the body are shrunk onto a stator of the electric machine. Furthermore, a bearing plate system can be attached to the base body to protect the front side of the rotor. The Lageschildsystem can be screwed to the body.

Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings. Show it:

Figure 1 is an exploded view of a drive with an electric machine having a cooling housing according to the invention. 2 is a schematic representation of a first embodiment of a cooling housing according to the invention;

Fig. 3 is a schematic representation of a main body of the invention

Cooling housing of the first embodiment;

Fig. 4 is a schematic representation of a jacket plate of the invention

Cooling housing of the first embodiment;

Fig. 5 is a schematic representation of the main body of the first embodiment, wherein the region of the separating web is shown as a plan view;

Fig. 6 is a schematic representation of the main body of the first embodiment, wherein the region of the separating web is shown as a side view; a method for producing the cooling housing according to the invention of the first embodiment; a cross-sectional view of a second embodiment of a

cooling housing according to the invention, and an enlarged section of the cross-sectional view of FIG. 8.

FIG. 1 shows an exploded view of an electric drive 1 for a motor vehicle. The drive 1 has an electrical machine 10, a cooling housing 1 1 with a cast-on end shield (not shown) and a screwed bearing plate 12.

The electric machine 10 includes a stator 100 and a rotor 13, which in the

cast shield and the screwed bearing plates 12 is mounted. The

Cooling housing 1 1 has a molded stator support 2 and a jacket plate 3. The stator 100 of the electric machine 10 is partially inserted into the cooling housing 1 1 in the illustration of Figure 1 and is completely in the assembled state of the

Cooling housing 1 1 added. The bolted end shield 12 is formed shield-like and together with the cast-on end shield of the bearing of the rotor 13 in the stator 100. The bearing plate 12 covers when the rotor 13 is pushed in the stator 100 and the electric machine 10 is received in the cooling housing 1 1 , a first face of the Cooling housing 1 1 and is bolted to the cooling housing 1 1 to fix the stator 100 and the electrical machine 10 laterally to protect against environmental influences.

A first embodiment of the cooling housing 1 1 and the stator 2 and the shroud 3 will now be described with reference to Figures 2 to 6 in detail.

The stator support 2 is a hollow cylinder-like body having an inner surface 20, an outer side surface 21, an open first end 22 and a partially closed second end 23, wherein the second end face 23 is partially closed by the cast-on end shield. The inner surface 20 defines a circular cylindrical cavity for receiving the electric machine 10 whose size is adapted to the extent of the stator 100 of the electric machine 10.

On the mantle surface 21, the stator support 2 has a recess 24 and a separating web 25. The recess 24 is spaced from the first end face 22 and the second

End face 23 is positioned and extends in the direction of a longitudinal axis L of the cooling housing 1 1 over about% of a length of the stator 2. The recess 24 further extends in a circumferential direction U of the cooling housing 1 1 and is in the circumferential direction U of the

Divider 25 interrupted. The separating web 25 extends parallel to the longitudinal axis L of the cooling housing 1 1 and has an outer surface 250 and a first flank 251 and a second flank 252, which define the recess 24 in regions. In addition, the mantle surface 21 has adjacent to the first end face 22 and the second end face 23 a plurality of Schraubbutzen 26 for fixing the end plate 12 and a transmission and other protruding connecting elements, which protrude from the mantle surface 21.

The separating web 25 has, in its outer surface 250, a first through-opening 253 and a second through-opening 254, into which connecting stubs 4 are hammered. The first through-opening 253 opens into the recess 24 on the first flank 251 of the separating web 25 and the second through-opening 254 opens into the recess 24 on the second flank 252 of the separating web 25. The through-openings 253, 254 have a circular diameter in the region of the outer surface 250 on and widen in the region of the respective flank 251, 252 of the separating web 25 to a wide slot 2530, as Figure 6 shows. About the first passage opening 253, the supply of cooling water in the

Recess 24 and via the second passage opening 254, the discharge of cooling water from the recess 24. The supply of cooling water is indicated in Figures 5 and 6 by the arrows Z and the discharge of the cooling water is indicated by the arrows A. Of the Divider 25 thus ensures a spatial separation of inlet and outlet and a directed in the circumferential direction U flow S of the cooling water through the recess 24th

The recess 24 has a cooling structure with a plurality of cooling fins 240, which extend along the circumferential direction U of the cooling housing 2 through the recess 24. Adjacent to the first flank 251 of the separating web 25, the recess 24 has a collecting area 241 for fresh, cold cooling water, so that the cooling water can be distributed in the longitudinal direction L over the entire extent of the recess 24. Adjacent to the second flank 252 of the separating web 25, the recess 24 has a collecting region 242 for heated

Cooling water, so that the cooling water, which has flowed along the cooling fins, can be collected and removed. By the inlet and outlet of the cooling water are distributed symmetrically as possible over the length of the cooling housing 1 1, a uniform flow through the cooling housing 1 1 is achieved, since the pressure losses or lengths of the individual currents compensate each other.

The recess 24 is surrounded by a support border 27, which is embedded in the mantle surface 20. The support edge 27 extends along the first flank 251 of the separating web 25, along a first boundary 243 of the recess 24 extending in the circumferential direction U, along the second flank 252 of the separating web 25 and along a second boundary 244 of the recess 24 running in the direction of circulation U.

The jacket plate 3 is a bent to a hollow cylinder sector with rounded transition areas sheet of an aluminum alloy. The jacket element 3 has a

Inner surface 30, an outer surface 31, a first end face 32 and a second

Front side 33 on. The inner surface 30 and the outer surface 31 have a

Interrupt 34, which by a first terminal edge 340 and a second

Terminal edge 341 is fixed. In the region of the first end face 32, the jacket element 3 has a first end side edge 320 and in the region of the second end face 33, the jacket element 3 has a second end side edge 330. The rounded transition areas are by transition edges between the front side edges 320, 330 and the

Connection edges 340, 341 set.

The jacket plate 3 is welded to the stator 2 along a circumferential weld seam 28 shown in FIG. The jacket plate 3 rests with its edges 320, 330, 340, 341 on the support border 27 and covers the recess 24 completely. The jacket sheet 3 is welded fluid-tight along all edges of the jacket plate 3 with the stator 2 and closes the cooling jacket to the outside.

Hereinafter, a method 5 for producing a cooling housing 1 1 according to the first embodiment will be described with reference to Figure 7.

At 50, a stator support 2 as described above is provided. For this purpose, a non-machined blank in the form of the stator carrier described above is made available by means of a permanent mold casting process.

At 51, a jacket sheet 3 as described above is provided. For this purpose, a sheet is cut into a rectangle with rounded corners so that a length of the later connecting edges 340, 341 by a double width of the support edge 27 are longer than the flanks 250, 251 of the divider 25 and that a length of the later

End side edges 320, 330 by a double width of the support edge 27 are longer than the boundaries 243, 244 of the recess 24. Subsequently, the sheet is bent to the hollow cylinder sector-like jacket plate.

At 52, the jacket plate 3 is applied to the stator 2, that the jacket plate 3, the recess 24 covers. For this purpose, the jacket plate 3 is spread elastically and placed around the stator 2 so that the first end edge 320 rests in the region of the first boundary 243 of the recess 24 on the support edge 27, the second end edge 330 in the region of the second boundary 244 of the recess 24 on the Pad rims 27 rests, the first terminal edge 340 rests in the region of the first edge 251 of the divider 25 on the support edge 27 and the second terminal edge 341 rests in the region of the second edge 252 of the divider 25 on the support border 27.

At 53, the jacket sheet 3 is fluid-tightly welded to the stator support 2 by means of a MIG welding process, while the jacket sheet 3, the recess 24 in the stator

2 covers and rests against this. For this purpose, a circumferential weld 28 is produced in the region of the support edge 27, each of the edges 320, 330, 340, 341 of the jacket sheet

3 fluid-tight manner with the stator 2 connects.

At 54, the tightness of weld 28 is tested. This is about the first

Through opening 253, for example. Air in the closed with the jacket plate 3 recess 24th let in and the second passage opening 254 closed. It is checked whether the pressure can be maintained over a defined period of time.

If no pressure drop, the cooling housing 1 1 can be further processed, for example, be shrunk onto a stator 100. Otherwise, the leaks in the weld 28 are determined and reworked and sealed by means of a TIG welding process.

Figures 8 and 9 show a second embodiment of a cooling housing 1 1 '. The cooling housing 1 1 'has a stator 2' and a jacket plate 3.

The stator support 2 'similar to the stator 2 of the first embodiment has a hollow cylindrical body having on its outer side 21 has a recess 24 and a divider (not shown in Figures 7 and 8). The recess 24 is surrounded by a support border 27.

In contrast to the stator 2 of the first embodiment, the recess 24 of the stator 2 'of the second embodiment, a support structure in the form of two support ribs 244 extending in the circumferential direction U of the cooling housing 1 1'. The support ribs 244 have a height that corresponds approximately to a depth of the recess 24 and divide the recess 24 in the direction of the longitudinal axis L of the cooling housing into three symmetrical, circumferential cooling channels, each having six, extending in the circumferential direction U cooling fins 240. The support ribs 244 form defined contact points with the jacket sheet 3 and avoid contact between the cooling ribs 240 and thus undesirable acoustic or fluidic side effects.

Furthermore, the stator support 2 'has a bead 29 surrounding the support border 27. The bead 29 is designed such that it forms a wedge-shaped groove between the jacket plate 3 and the stator 2 'with the jacket plate 3, in the additional welding

Weld metal can be inserted to increase the quality of the weld and to improve the tightness.

The jacket sheet 3 is formed as with respect to the first embodiment. Again, the jacket plate 3 is circumferentially welded to the stator 2 'to cover the recess 24 fluid-tight. In summary, the cooling housing according to the invention for an electrical

Making a machine simple and inexpensive and is very robust. The cooling housing can be cast as a casting without a lost core, as it is used for the production of a "cast

As compared with the "built-in cooling water jacket" there are no sealing points in the direction of the E-machine room, thus increasing the robustness and reducing consequential damage in the event of a possible failure of the sealing points can be automated and run in series with a MIG welding process.

LIST OF REFERENCE NUMBERS

1 drive

10 electric machine

1 1, 1 1 'cooling housing

12 end shield

13 rotor

2, 2 'stator

20 inner surface

21 outside jacket surface

22 first end face

23 second end face

24 recess

240 cooling fins

241 Collection area for fresh cooling water

242 Collection area for heated cooling water

243 first limit

244 second boundary

245 support ribs

25 divider

250 outer surface

251 first flank

252 second flank

253 first passage opening

2530 wide slot

254 second passage opening

26 screw jack

27 edition border

28 weld

29 circumferential bead

3 jacket sheet

30 inner surface

31 outer surface 32 first end face

320 first end edge

33 second end face

330 second front edge

34 interruption

340 first connecting edge

341 second connecting edge

4 connecting pieces

5 manufacturing process

50 Providing a stator carrier

51 Providing a sheath plate

52 Applying the jacket plate to the stator carrier

53 Welding the jacket plate to the stator

54 Checking the tightness

L longitudinal axis

U circumferential direction

Z cooling water supply

A cooling water drain

S flow of cooling water

Claims

claims

A cooling housing for an electrical machine, comprising:

a base body (2) for receiving the electrical machine (10), wherein the base body (2) in its outer surface (21) extends in the circumferential direction of

Base body (2) has expansive recess (24); and

a bent jacket element (3) which is mechanically coupled to the base body (2), wherein the bent jacket element (3) has a first end face (32), one through a jacket surface (31) of the jacket element (3) from the first end face (32 ) spaced, second end face (33) and an interruption (34) extending along a on the jacket surface (31) extending connecting line between the first end face (32) and the second end face (33) of the jacket member (3) and through a first connection edge (340) and a second connection edge (341) lying opposite the first connection edge (340) are defined,

wherein the first connection edge (340) and the second connection edge (341) of the jacket element (3) are mechanically coupled to one another and / or to the base body (2) in a fluid-tight manner, while the jacket element (3) engages the recess (24) in the base body (2). covers and rests against the base body (2).

2. The cooling housing according to claim 1, wherein the jacket element (3) has a first end side edge (320) on the first end face (32) and a second end face (33) on the second end face (33)

End side edge (330), wherein the first end side edge (320) and the second end side edge (330) with the main body (2) are mechanically coupled fluid-tight.

3. Cooling housing according to claim 1 or 2, wherein the interruption (34) of the

Sheath element (3) from the first end face (32) to the second end face (33) of the

Sheath element (3) extends.

4. The cooling housing according to one of the preceding claims, wherein the base body (2) has a separating web (25), the recess (24) in the circumferential direction of

Base body (2) interrupts, wherein the first connecting edge (340) and the second connecting edge (341) with the separating web (25) are mechanically coupled fluid-tight. Cooling housing according to claim 4, wherein the separating web (25) in an outer surface (250) of the separating web (25) has a first passage opening (253) which opens into the recess (24) of the base body (2).

A cooling housing according to claim 5, wherein the divider (25) has in its outer surface (250) a second passage opening (254) opening into the recess (24), the first passage opening (253) and the second passage opening (254) being opposite Flanks (251, 252) of the separating web (25) in the recess (24) open.

Cooling housing according to one of the preceding claims, wherein the base body (2) has a bearing border (27) delimiting the recess (24) for placing the jacket element (3) in preparation for the mechanical coupling between the housing

Sheath element (3) and the base body (2), wherein the support border (27) in particular

in the outside (21) of the base body (2) is inserted; or

is formed by a bead (29) on the outer side (21) of the base body (2), which rotates the recess (24) at a predetermined distance.

Cooling housing according to one of the preceding claims, wherein the recess (24) of the base body (2) comprises:

a cooling structure, in particular cooling ribs (240); and or

a support structure (244) which serves as a support of the jacket element.

Method for producing a cooling housing (1 1) for an electrical machine (10), in particular a cooling housing (1 1) according to one of the preceding claims, comprising:

Providing (50) a base body (2) for receiving the electrical

Machine (10), wherein the base body (2) in its outer surface (21) in

Having circumferential direction of the base body (2) expansive recess (24);

Providing (51) a bent jacket element (3) with a first end face (32), a second end face (33) spaced from the first end face (32) by a jacket surface (31) of the jacket element (3) and an interruption (34) which extends along a connecting line extending on the jacket surface (3) between the first end face (32) and the second end face (33) of the jacket element (3) and by a first connecting edge (340) and one of the first connecting edge (340) opposite, second terminal edge (341) is fixed;

Placing (52) of the jacket element (3) on the base body (2) such that the jacket element (3) covers the recess (24); and

Fluid-tight mechanical coupling (53) of the first connection edge (340) and the second connection edge (341) of the jacket element (3) to one another and / or to the base body (2), while the jacket element (3) engages the recess (24) in the base body (2 ) covers and rests against the base body (2).

10. The method of claim 9, wherein the first terminal edge (340) and the second

Connecting edge (341) of the jacket member (3) fluid-tight with each other or with the

Main body (2) are welded, in particular additional weld metal is used.