DE102015221777A1 - Housing arrangement for an electrical machine - Google Patents

Abstract

The invention relates to a housing assembly for an electrical machine (eg, an electric motor and / or a generator), comprising: - a housing (110) having a stator receiving portion (120); A stator (140) of the electric machine arranged in the stator receiving region (120) of the housing (110); and - a cooling jacket (130) surrounding the stator (140) for liquid cooling of the stator (140), wherein the stator outer wall of the stator (140) at the same time forms the inner cooling jacket surface of the cooling jacket (130).

Description

The invention relates to a housing arrangement for an electrical machine, comprising a housing which has (at least) a stator receiving region, a stator of the electric machine arranged in the stator receiving region of the housing and a cooling jacket surrounding the stator for liquid cooling of the stator.

An electric machine is understood to mean an electromechanical converter which converts electrical energy into mechanical energy and / or mechanical energy into electrical energy. In particular, it is an electric motor (electric motor) and / or generator having a fixed stator or stator and a rotatably mounted in the stator rotor or rotor (inner rotor).

When used in the vehicle sector, for example as a drive or drive motor and / or generator (alternator), the electric machine can be arranged on the stator side in a housing, high power densities occur due to high performance and limited space, so that an active cooling is required , The cooling is usually done by means of a surrounding the stator cooling jacket for liquid cooling (water cooling). The cooling jacket usually consists of a closed, substantially annular or hollow cylindrical cavity having an inlet and outlet for the cooling liquid. The cooling jacket is delimited by a radially outer cooling jacket surface, a radially inner cooling jacket surface and lateral or axial cooling jacket surfaces. The available radial space is often only 10 mm to 20 mm, which makes the production expensive due to complex manufacturing technology.

The DE 10 2013 006 623 A1 describes a cooling jacket for an electric machine and method for producing an electric machine with a cooling jacket. First, the stator of the electric machine in an inner part (also referred to as inner cylinder or stator) arranged or connected to this. Then, the inner part is combined with an outer part (also referred to as outer cylinder), wherein between the parts a cavity is formed, which can be flowed through by a cooling fluid. The DE 10 2009 031 727 A1 describes a housing arrangement for a liquid-cooled electric machine with a basically same construction of the cooling jacket.

The invention has for its object to provide a housing arrangement of the kind that is simple and inexpensive to produce.

This object is achieved by a housing arrangement according to the invention with the features of claim 1. Preferred developments and refinements of the invention emerge from the dependent claims, the following description and the figures.

The housing arrangement according to the invention is characterized in that the stator outer wall or stator peripheral surface of the stator at the same time forms the inner cooling jacket surface of the cooling jacket. The cooling jacket or the cavity through which coolant can flow is therefore delimited inward or stator by the stator itself, ie. h., The outer surface of the stator is used as the inner cooling jacket surface. The stator is thus virtually a component of the cooling jacket. The cooling jacket is preferably a ring-cylindrical or hollow-cylindrical cavity.

Advantageously, this results in a simple and cost-effective production of the housing receiving the stator, which is typically a cast housing and in particular a light metal die-cast housing, a simple assembly of the components and a compact arrangement possibility of the components. Furthermore, the housing arrangement can be realized with fewer and / or less expensive components or components and also a space savings can be achieved.

The torque support of the stator relative to the housing can be made by means of a lid and / or bottom closing the cooling jacket. The lid and / or bottom may be welded or soldered to the stator. About the welding or soldering can be accomplished at the same time the stator-side sealing. The housing-side seal can be accomplished via at least one sealing ring or the like.

The stator may be formed of a plurality of stator laminations (so-called laminated stator core), which are welded or soldered together inwardly for the purpose of sealing the cooling jacket. The soldering can be done, for example, by means of immersion bath, in which the outer surface of the laminated stator core is immersed under a continuous rotational movement.

In the case of a stator formed from individual stator laminations, the sealing of the cooling jacket to the inside can also take place by means of a sleeve pushed onto the stator or by means of a sealing cylinder. Preferably, the sleeve of a metal material, for example. Steel, formed and has a wall thickness of not more than 0.8 mm. The sleeve or the sealing cylinder can be welded or soldered to the cover and / or bottom, wherein these Welding or soldering can also have a sealing function at the same time. The welding takes place, for example, by resistance welding, in particular by means of capacitor discharge.

In the case of a stator formed from individual stator laminations, for the purpose of sealing the cooling jacket inwardly, it can also be encased with an elastomer, in particular encapsulated or formed with an elastomer encapsulation. The elastomer is a plastic with elastic properties, for example, a silicone. An elastomer sheathing may, for example, also be formed by a shrunk-on shrink tubing. The Elastomerummantelung or Elastomerumspritzung may have a thickness of 0.1 mm to 2.0 mm, preferably from 0.2 mm to 1.0 mm and in particular of about 0.5 mm.

The laminated stator core can be supported by a plurality of stabilizing rods arranged distributed over the circumference. The stabilizing rods are used, for example, in grooves. In particular, these were metallic stabilizing rods. The stabilizing bars may be overmolded by the elastomer. Preferably, however, it is provided that the stabilizing rods protrude at least partially in the radial direction through the elastomer layer or extrusion coating and protrude directly into the water jacket and thereby come into contact with the cooling liquid.

By using a sleeve or a Elastomerumspritzung the welding or soldering of the stator plates can be omitted, however nevertheless be provided.

Preferably designed as a plastic insert cooling structure is arranged in the cooling jacket, so that the cooling liquid can flow in a defined manner through the cooling jacket. The plastic insert is, for example, an injection-molded part. In the housing arrangement according to the invention, the cooling jacket is formed and sealed only during assembly of the components, so that the plastic insert can be easily positioned. Compared to other variants, for example, the integration of the casting by using a correspondingly filigree shaped salt core, there are significant advantages.

The housing may be any E-motor / generator housing with integrated stator cooling, in particular for use in the vehicle sector. The invention is equally suitable for vehicles with a purely electric drive as well as for vehicles with a hybrid drive. The housing may therefore also be a so-called hybrid transmission housing or hybrid transmission housing part for a motor vehicle. This hybrid transmission housing has, for example, a Statoraufnahmebereich for the arrangement of serving as a driving or driving motor electric motor (possibly also with generator function) and / or generator, wherein the electric motor and / or generator or its stator by the surrounding, inventively designed cooling jacket active can be cooled.

The invention will be explained in more detail below in a non-limiting manner with reference to possible embodiments with reference to the figures. The features shown in the figures and / or explained below may be, even detached from concrete feature combinations, general features of the invention and further develop the invention.

1 shows a side view of a hybrid transmission housing part.

2 schematically shows a section through the cooling jacket according to the in 1 indicated sectioning.

3 shows in a perspective view a stator with elastomer coating.

1 shows a hybrid transmission housing part 110 a hybrid transmission 100 for a motor vehicle (car) with hybrid drive. In the case part 110 it is a light metal and especially aluminum die-cast component. With 120 is a designed as a pot-like cavity (empty space) Statoraufnahmebereich for one in the hybrid transmission 100 to be arranged electric motor (traction motor) and / or generator called. During operation, the electric motor and / or generator must be actively cooled in order to safely dissipate the resulting heat. For this purpose, a Statoraufnahmebereich or section 120 surrounding cooling channel or cooling jacket 130 provided, which can be flowed through by a cooling liquid. The illustrated with dashed circular lines annular cylindrical cooling jacket 130 has, for example, an inner diameter of 250 mm to 300 mm. Inside the integrated cooling jacket 130 may be arranged as an insert formed cooling structure (not shown).

2 shows a section through the cooling jacket 130 according to the in 1 specified section AA with inserted or mounted stator 140 , The stator 140 is from a variety of individual stator laminations 141 formed, which are stacked or summarized to form a so-called stator lamination. With 125 are outside of the stator receiving area 120 arranged cooling, stability and acoustic ribs.

According to the invention it is provided that the Statoraußenwandung also the inner cooling jacket surface of the cooling jacket 130 forms. In the radial direction r is the cooling jacket 130 inwardly through the stator outer wall and out through the stator receiving area 120 of the housing 100 limited. In the axial direction l is the cooling jacket 130 through the ground 150 and the lid 160 limited. The floor 150 and / or the lid 160 is / are formed from a metal material, in particular steel, but may in principle also be formed from a plastic or plastic composite material. The lid 160 is with the housing or housing part 110 screwed (see screws 165 ) or other suitable way on the housing 110 fastened, whereby at the same time also the torque support of the stator 140 opposite the housing 110 he follows. In the embodiment shown, the annular bottom 150 and the annular lid 160 with the stator 140 welded, with other types of connections are possible in principle. With the welds 152 and 162 At the same time, the stator-side sealing of the cooling jacket takes place 130 , The housing-side sealing is done by means of elastic seals (sealing rings) 171 and 173 in circumferential grooves 172 and 174 are arranged.

The sealing of the cooling jacket 130 After (radially) inside can be done by the stator plates 141 welded or soldered together. Alternatively or additionally, the inner seal by means of a on the stator or the stator lamination stack 140 deferred thin sleeve or by means of thin-walled sealing cylinder 180 respectively. The sleeve or the sealing cylinder 180 is made of metal and on its front sides over the welds 152 and 162 fixed and sealed. The sleeve 180 can also be flat, ie on its inner circumference, with the stator 140 welded or soldered. The welding takes place, for example, by resistance welding, in particular by means of capacitor discharge.

Instead of a metallic sleeve 180 can the stator lamination package 140 Also have an elastomer sheath and, for example, be overmoulded with an elastomer or an elastomer layer. The Elastomerumspritzung can also the inner surface of the soil 150 and / or the lid 160 cover or cover and thereby a stator-side seal on the ground 150 or lid 160 cause.

3 shows a stator or a laminated stator core 140 that with an elastomer 190 is overmoulded. The elastomer layer 190 is directly on the outer peripheral surface of the laminated stator core 140 applied as illustrated by the breakout shown. The Elastomerumspritzung 190 allows and tolerates a slight relative movement (eg, in case of vibration) of the individual stator laminations 141 ,

The stator core 140 is formed by a plurality of metallic or possibly also of plastic stabilizing rods 195 supported, distributed over the circumference in axially extending (ie in the axial direction l of the stator 140 running) outer grooves used and the elastomeric extrusion 190 are over splashed. The stabilizing bars 195 prevent twisting of the stator laminations 141 relative to each other. The stabilizing bars 195 can in the radial direction through the elastomer layer 190 protrude through and directly into the water jacket 130 protrude, which improves the heat transfer.

The stabilizing rods formed of metal, in particular steel, or optionally also of plastic or plastic composite material 195 can in the outer grooves of the stator lamination 140 welded, soldered, glued or embedded in any other way.

It is preferably provided that the welded joint 162 not circumferentially formed, but only selectively executed and a connection between the inner wall of the lid 160 and the stabilizing bars 195 manufactures. The seal can be made by the elastomeric extrusion, as described above.

The features explained above and / or shown in the figures can be combined within the scope of the invention to form further embodiments according to the invention.

LIST OF REFERENCE NUMBERS

100

hybrid transmission

110

Hybrid transmission housing part

120

Statoraufnahmebereich

125

ribs

130

cooling jacket

140

stator

141

stator lamination

150

ground

152

Weld

160

cover

162

Weld

165

screw

171

poetry

172

seal groove

173

poetry

174

seal groove

180

Sleeve, sealing cylinder

190

Elastomerumspritzung

195

stabilizing rod

l

axial direction

r

radial direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013006623 A1 [0004]
• DE 102009031727 A1 [0004]

Claims (10)

Housing arrangement for an electrical machine, comprising: - a housing ( 110 ) with a stator receiving area ( 120 ); - one in the stator receiving area ( 120 ) of the housing ( 110 ) arranged stator ( 140 ) of the electric machine; and - one the stator ( 140 ) surrounding cooling jacket ( 130 ) for liquid cooling of the stator ( 140 ); characterized in that the Statoraußenwandung also forms the inner cooling jacket surface. Housing arrangement according to claim 1, characterized in that the torque support of the stator ( 140 ) opposite the housing ( 110 ) using a cooling jacket ( 130 ) closing lid ( 160 ) and / or soil ( 150 ) he follows. Housing arrangement according to claim 2, characterized in that the cover ( 160 ) and / or soil ( 150 ) with the stator ( 140 ) is welded or soldered. Housing arrangement according to one of the preceding claims, characterized in that the stator ( 140 ) of a plurality of stator laminations ( 141 ) is formed, which are welded or soldered together for the purpose of sealing. Housing arrangement according to one of the preceding claims 1 to 4, characterized in that the stator ( 140 ) of a plurality of stator laminations ( 141 ) and by a deferred sleeve ( 180 ) is sealed. Housing arrangement according to claim 5, characterized in that the sleeve ( 180 ) is formed of a metal material and has a wall thickness of not more than 0.8 mm. Housing arrangement according to one of the preceding claims 1 to 4, characterized in that the stator ( 140 ) of a plurality of stator laminations ( 141 ) formed for the purpose of sealing with an elastomer ( 190 ) are sprayed over. Housing arrangement according to one of the preceding claims and in particular according to claim 7, characterized in that the laminated stator core ( 140 ) by a plurality of distributed over the circumference arranged metallic stabilization rods ( 195 ) is supported. Housing arrangement according to claim 8, characterized in that the stabilizing rods ( 195 ) in the radial direction (r) through the elastomer layer ( 190 ) and directly into the water jacket ( 130 protrude). Housing arrangement according to one of the preceding claims, characterized in that in the cooling jacket ( 130 ) arranged as a plastic insert cooling structure is arranged.

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