DE202017106936U1 - Device for inductive energy transfer and stationary part - Google Patents

Abstract

Stationary part of a device (2) for inductive energy transmission, wherein the stationary part (1) has a bottom part (3), wherein the stationary part (1) has a bellows (7) attached to the bottom part (3) in that the stationary part has at least one through-opening (10, 11, 18), wherein the at least one through-opening (10, 11, 18) in a region of the bottom part (3) encompassed by the bellows (7) or in an area outside the of the bellows (7) covered area of the bottom part (3) is arranged.

Description

The invention relates to a device for inductive energy transmission and a stationary part of such a device.

Electric vehicles, in particular rail-bound vehicles, and / or road vehicles can be operated with electrical energy, which is transmitted via an inductive energy transfer to the vehicle. For example, such vehicles may include circuitry that is a traction system or part of a traction system of the vehicle. This circuit arrangement may comprise a receiving device for receiving an alternating electromagnetic field and for generating an alternating current due to electromagnetic induction. Further, a vehicle may include a rectifier that converts an alternating current to a direct current. The DC power can be used to charge a traction battery or operate an electric machine of the vehicle. In the latter case, the direct current can be converted back into an alternating current by an inverter. The inductive power transmission can be performed by using two sets, in particular three-phase turns. A first set of windings is installed in or on the ground (primary windings) and can be operated by a power converter arranged on the side. A second set of turns (secondary turns) is arranged on the vehicle. For example, the second set of turns may be disposed under the vehicle, in the case of a tram under one or more wagons. In an automobile, the second set of windings may be attached to the vehicle chassis. The second set of turns can also be described as a pick-up arrangement or receiving device.

A primary unit may comprise the primary windings and a secondary unit may comprise the secondary windings.

The first and second sets of windings form a high frequency transformer to transfer electrical energy to the vehicle. This can be done in a static state (when the vehicle is not moving) or in a dynamic state (when the vehicle is moving).

The WO 2015/128450 A1 discloses a device for inductive power transmission.

It raises the technical problem of improving the reliability of such a device for inductive energy transfer.

The solution of the technical problem results from the objects with the features of claims 1 and 11. Further advantageous embodiments of the invention will become apparent from the dependent claims.

A stationary part of a device for inductive energy transmission is proposed. The device for inductive energy transmission can also be referred to as an inductive charging pad. The inductive power transmission device may be part of or form a primary unit of an inductive power transmission system. The device may in this case comprise the stationary part and a movable part. The movable part may comprise a primary winding structure. The primary winding structure may generate an electromagnetic alternating field when an operating (alternating) current is applied to the primary winding structure or the primary winding structure is being supplied with the operating current.

The movable part can be moved back and forth between a retracted and an extended state. The device may for this purpose comprise at least one means for moving the movable part, in particular at least one actuator. For the purposes of this invention, the term "means of movement" may denote a set of components or elements by which movement of the movable part may be generated. Thus, the means for movement may comprise the actuator and / or a lifting mechanism or a lifting means. Furthermore, the term may also include coupling means for mechanical coupling between the actuator and the lifting mechanism or lifting means and / or at least one guiding means for guiding the movement of the moving part.

The movable part can be moved at least along a first direction, in particular by the means for movement. The first direction may be oriented parallel to a main propagation direction of the electromagnetic field generated by the primary winding structure. The main propagation direction may be oriented from the primary winding structure to a secondary winding structure when disposed over the primary winding structure for receiving the generated electromagnetic field.

In particular, the first direction may be oriented orthogonal to a bottom surface of the inductive energy transfer device or to a surface of the bottom on which the device is mounted. The first direction may be oriented away from the bottom surface.

For the purposes of this invention, the first direction may also be referred to as a vertical direction. Hereinafter, directional terms such as "upper,""lower,""above,""below,""lowest,""highest,""lower" may refer to this vertical direction.

In the retracted state, the movable part may be positioned in a retracted position, in particular with respect to the first direction, for example in a lowest vertical position. Accordingly, the movable member may be positioned in an extended condition at an extended position, particularly at a highest vertical position. In the retracted state, at least a part of an upper side of the movable part can be arranged in the same plane as an upper side of the stationary part or a part thereof.

The device for inductive energy transmission, in particular the stationary part, can have or form a fastening section. This can be formed by at least part of a bottom part of the stationary part. The attachment portion may be used for attaching the stationary part to a support structure, in particular on a surface of a road or on a wall, for example a garage wall.

The stationary part thus has a bottom part. In the assembled state of the stationary part, the bottom part is attached to the support structure.

Further, the stationary part on a bellows, which is fixed to the bottom part. The bellows can also be attached to the movable part of the device. The bellows comprises an internal volume which is enclosed by the bellows, the stationary part and the movable part. In this inner volume, for example, the previously explained means for movement, in particular a lifting means and / or guide means may be arranged. Also, the at least one actuator can be arranged in the inner volume. When moved to the extended state, the bellows is unfolded. Upon movement from the extended state to the retracted state, the bellows is folded. The bellows serves to protect the arranged in the internal volume components, especially against liquids such as water and dirt.

According to the invention, the stationary part has at least one passage opening. The at least one passage opening is arranged in a region of the bottom part encompassed by the bellows or in a region outside the region of the bottom part which is enclosed by the bellows. The area outside the area enclosed by the bellows can also be referred to as outside area.

The following explanations can refer to the following reference coordinate system. The coordinate system may be defined by a longitudinal direction (x-direction), a transverse direction (y-direction) and the above-explained vertical direction. The longitudinal and transverse directions can span a plane that is parallel or substantially parallel to a mounting surface of the support structure, in particular the bottom surface, oriented to which the device, in particular the stationary part, is mounted. Also, the plane may be perpendicular to the previously explained first direction (vertical direction). The longitudinal, transverse and vertical directions can each be oriented orthogonal to one another.

If the stationary part is arranged on a surface of a road, then the vertical direction can be oriented in particular parallel to a gravitational direction.

It is also possible that the primary winding structure extends along a direction oriented parallel to the longitudinal direction. For example, For example, the primary winding structure, in particular a phase line of the primary winding structure, may comprise a plurality of underwindings which are arranged one behind the other along the direction of extension. It is also possible that the primary winding structure comprises three phase lines, each phase line comprising a plurality of underwinds, each extending along the direction of extent.

Parallel to the longitudinal direction or substantially parallel thereto oriented edges of the stationary part may also be referred to as a longitudinal edge. Edges oriented parallel to the transverse direction or substantially parallel thereto may also be referred to as transverse edge or end face.

It is possible that the stationary part comprises a housing portion and a receiving portion for receiving the movable part, at least in the retracted state. In the stationary part, for example, electrical or electronic components, e.g. Components of an inverter, be arranged.

In the receiving portion of the bellows and other elements, in particular the movable part in the retracted state, may be arranged. In the housing section, the stationary part can have or form a housing which protects the components arranged therein, in particular against dirt and water. Of course, the stationary part Connection devices for connection of external supply means, for example means for energy or coolant supply have.

An underwinding may in this case designate a, preferably complete, conductor loop which encloses a predetermined area. The conductor loop may include or form one or more turns. Adjacent to one another may mean that central axes of symmetry of the sub-convolutions adjacent to each other along the direction of extension are spaced apart from each other by a predetermined distance along a straight line which is oriented parallel to the direction of extent.

In this case, underwindings may have any desired geometric shapes, but preferably a rectangular shape or a circular shape.

Through the passage openings in the region enclosed by the bellows, which can also be referred to as interior region, it results in an advantageous manner that a liquid or fluid, in particular water, which collects in the interior, can flow off, in particular through the passage opening. This increases the reliability of a device for inductive energy transmission with such a stationary part, since e.g. interior component parts rust less or a functionality of a disposed there electrical component, e.g. the actuator, not be affected by water.

The passage openings arranged in the outer area advantageously make it possible for fluid draining or draining from the bellows, for example sprayed water, to flow reliably and quickly away from or away from the stationary part. In particular, the water at the bellows may flow down into or onto a support portion of the stationary part for the bellows, the fluid then being able to flow away from the stationary part through the outward passage openings.

This reduces the risk that liquid, in particular water, can penetrate from the outer area into the inner area and endanger the functionality of components there.

In a further embodiment, a passage opening is arranged in a bottom surface of the bottom part or extending through the bottom surface. In other words, the bottom surface may have the passage opening. In this case, in particular, a central axis of symmetry of the passage opening can be oriented parallel to the previously explained vertical direction. In particular, the bottom part may have a bottom surface or a plurality of bottom surface sections. In a bottom surface portion, the bottom surface may be oriented orthogonal to the vertical direction. Thus, therefore, liquid can flow out through the through-opening on from an upper side to an underside of the bottom part.

A movement of the liquid can in this case take place at least partially due to an acting weight force. Thus, by such an orientation of the passage opening in an advantageous manner that liquid easily and reliably exits or flows out of the inner or outer region of the bottom part.

In a further embodiment, the bottom part has a wall section protruding from a bottom surface of the bottom part or forms it. By such a wall section, e.g. different floor surface sections are delimited from each other. For example, the above-described outer region may have a cooling channel section which is separated by a wall section from the previously described bellows seating section. Further, the support portion for the bellows may be separated by a further wall portion of a further or more further bottom surface portions in the inner region.

It is possible for the wall section to have an interior volume which is opened downwards in the vertical direction. In other words, the wall section thus comprises an internal volume which is open on one side, in particular downwards. In this case, the passage opening can be arranged in the wall section, in particular in a side wall section of the wall section. A normal vector of the sidewall portion may comprise a directional portion oriented parallel to the longitudinal and / or transverse direction discussed above.

In particular, therefore, a central axis of symmetry of the passage opening can not be oriented parallel to the previously explained vertical direction. Rather, the central axis of symmetry may comprise at least one directional portion, which is oriented parallel to the longitudinal and / or transverse direction explained above. It is possible in this case for the central axis of symmetry to have no directional component which is oriented parallel to the vertical direction. However, this is not mandatory. It is also conceivable that the central axis of symmetry has a directional component which is oriented parallel to the vertical direction.

The through-hole may connect the inner volume of the wall portion with an upper surface of the bottom part. In this case it is it is possible for liquid to enter through the passage opening in the wall section from an upper side of the bottom part into the inner volume of the wall section and exit the inner volume through the opening of the wall section.

This advantageously results in a reliable outflow of liquid, since passage openings arranged in the wall section can not be easily closed by dirt, for example by leaves, stones or other particles, whereby the liquid drainage would be reduced or prevented.

In a further embodiment, the stationary part has or forms a support section for a stationary part-side end section of the bellows. In this support section, the bellows may be attached to the stationary part or rest on the stationary part, at least in the folded state. Further, the bellows may also have a further end portion for attachment to the movable part.

Furthermore, the at least one passage opening is arranged outside the region of the bottom part encompassed by the bellows and in an edge section of the support section or in a section of the bottom section adjacent to the support section. In particular, the through-opening can be arranged such that liquid draining or dripping from the bellows can flow off from the upper side of the bottom part as directly as possible through the through-opening.

In particular, it is possible for the passage opening to be arranged directly next to the bellows, in particular in the folded-in state, in a common projection plane, wherein the common projection surface can be oriented orthogonal to the vertical direction, for example. It is also possible that in this common projection plane a minimum distance of an edge of the passage opening from the bellows along the longitudinal and / or along the transverse direction is not greater than a predetermined amount, for example not greater than 5 mm.

In other words, it is possible that the through-holes are arranged as directly as possible next to the bellows in the outer region, in order to derive water draining from the bellows as directly as possible from the stationary part.

In a further embodiment, the bottom part has at least one means for fluid guidance of a fluid, preferably water, towards the at least one passage opening or forms it. Via the means for fluid guidance, fluid can be conducted from the inner or outer area towards the passage opening, in particular from areas or bottom surface sections of the base part which are adjacent to the passage opening. The means for fluid guidance may preferably be designed such that the weight force acting on the fluid at least partially effects a fluid flow towards the passage opening.

This results in an advantageous manner a more reliable drain of fluid at the stationary part and thus also increased reliability.

In a further embodiment, the means for fluid guidance is designed as a channel or as a channel. This results in an advantageous manner a simple design of the means for fluid guidance, in particular in a production of the stationary part by a casting process.

In a further embodiment, at least part of a portion of the bottom part surrounding the passage opening is chamfered towards the passage opening. The chamfer can in this case be designed in particular in such a way that fluid can flow along the chamfered surface towards the passage opening due to the weight force. This results in an advantageous manner as simple as possible a means for fluid management or to promote or ensure fluid drainage from the stationary part and thus in turn increased reliability.

In a further embodiment, the bottom part has at least two passage openings, wherein the passage openings have mutually different geometric shapes.

The fact that through-openings have different geometric shapes from one another may in particular mean that a geometric basic shape of a first through-opening is different from a geometric basic form of a further through-opening. For example, For example, the first through hole may have a circular shape as a basic shape, while the second through hole may have a long hole shape. A basic shape may in particular be a circular shape, a slot shape, a rectangular shape, a triangular shape, an oval shape, a polygon shape or another shape.

The fact that through-openings have different geometric shapes from one another may also mean that the through-openings have the same basic geometric shape, eg a slot shape or a rectangular shape, but different orientations, in particular in the reference coordinate system. In particular, central longitudinal axes of the Through holes have different orientations from each other.

For example, a geometric shape and / or orientation of a through opening, which is arranged in or on a first longitudinal edge of the bottom part or the receiving portion of the bottom part, may be different from a geometric shape of a through hole disposed on an opposite longitudinal edge or on a transverse edge is.

By the mutually different geometric shapes, a production of the stationary part, in particular by a casting process can be simplified. In particular, the geometric shape of the individual passage openings can be chosen such that the production of the stationary part takes place as a casting with a reliable material distribution of the casting material in a casting mold of the casting. In this case, the casting mold has sections or elements which define the position and shape of the passage openings, wherein the sections or elements are flowed around by the casting material.

In a further embodiment, geometric shapes of passage openings arranged along a predetermined direction are selected such that a pressure resistance associated with the passage openings increases along the predetermined direction.

The pressure resistance associated with a passage opening in this case is a pressure resistance of a body flowing around against a fluid flowing along the predetermined direction, in particular the casting material flowing along the predetermined direction, wherein a flowed-around outer surface of the body has a geometric shape corresponding to the passage opening. If the geometric shape of the passage opening is e.g. is formed as a circle with a predetermined diameter, the circulated body may be a cylinder with a circular cross-section and be the same diameter.

The predetermined direction may in particular be a casting direction. The predetermined direction may, for example, be oriented parallel to the longitudinal direction or parallel to the transverse direction. In this case, material is poured into a casting mold, which then flows along the casting direction and fills the casting mold.

That the through holes are arranged along the predetermined direction does not necessarily mean that they are arranged along a straight line which is oriented parallel to the predetermined direction.

This results in an advantageous manner a simple and reliable production of the stationary part, in particular by a casting process. In particular, it is ensured that a material distribution during casting is not obstructed or impeded by the sections or elements of the casting mold which determine the position and geometric shape of the through-openings in the stationary part.

In a further embodiment, a passage opening, which is arranged in or adjacent to a first subsection of the bearing section of the base part, has a geometric shape which differs from a geometric shape of a passage opening which is arranged in or adjacent to a further subsection of the bearing section is. In this case, the passage opening may in particular be arranged in each case in an edge section of the subsection.

Alternatively or cumulatively, a through-opening disposed in a first edge portion of the stationary part has a geometric shape different from a geometric shape of a through-hole arranged in another edge portion of the stationary part.

The first section of the support section may be arranged along the predetermined direction, in particular a casting direction, in front of the further section of the support section. Accordingly, the first edge portion may be arranged along the predetermined direction in front of the further edge portion of the stationary part. For example, the first part section may be arranged adjacent to a first longitudinal edge or a first transverse edge of the stationary part or the receiving section of the stationary part, wherein the further partial section adjacent to an opposite longitudinal edge or an opposite transverse edge of the stationary part or the receiving portion of the stationary part can be arranged.

Also, the first edge portion may correspond to a first longitudinal edge or first transverse edge, wherein the further edge portion corresponds to an opposite longitudinal edge or opposite transverse edge.

By way of example, passage openings which are arranged in or adjacent to a first subsection of the bearing section of the base part or in the first edge section may have a circular shape.

Through holes in or adjacent to another section or in the further edge portion are arranged, may have a slot shape. A slot may in this case denote an elongate passage opening whose narrow sides are closed by semicircles.

In this case, a longitudinal axis of the slot may be oriented parallel to the predetermined direction, but preferably orthogonal to the predetermined direction.

It is possible that openings are arranged both on the longitudinal and on the transverse edges of the stationary part or of the support section or in sections which run parallel to these edges. In this case, the through holes arranged in / at the transverse edges may also have geometric shapes different from the geometric shapes of the through holes arranged in / on a first longitudinal edge. Also, the through holes arranged in / at the transverse edges may have geometric shapes different from the geometric shapes of the through holes arranged in / on an opposite longitudinal edge.

This advantageously results in an improved adaptation to production conditions, in particular to a casting process.

Further proposed is a device for inductive energy transmission with a stationary part according to one of the embodiments disclosed in this disclosure. The device for inductive energy transmission in this case comprises a movable part, wherein the bellows is attached to the movable part. In the inner volume enclosed by the bellows, a lifting mechanism can be arranged which also connects the stationary part to the moving part. Further, in the internal volume and electrical connection means, such as cables, can be arranged, are connected by the elements of the movable part with elements of the stationary part.

Further described is a method of manufacturing a stationary part according to one of the embodiments disclosed in this disclosure. The method in this case comprises all manufacturing steps for producing such a stationary part. In particular, a bottom part can be provided. The bottom part can in particular be provided by a casting process. Here, casting material can be poured into a mold, wherein the bottom part after curing of the casting material has a desired shape. The casting mold may in this case be designed such that the stationary part (after hardening) has at least one passage opening, wherein the at least one passage opening is arranged in a region of the bottom part encompassed by the bellows or in a region outside the region of the bottom part which is enclosed by the bellows.

Further, a bellows is provided and fixed to the bottom part. The bellows can be fastened in particular to a stationary part-side end section on the stationary part, in particular on a receiving section of the stationary part.

Furthermore, at least one passage opening of the stationary part is provided. This can be done in the context of the previously discussed casting process. Of course, it is also possible that the passage opening is introduced after provision of the bottom part in the bottom part, for example by drilling, punching or by a further method for introducing a passage opening.

Furthermore, a wall section, a support section for the stationary part-side end section of the bellows, a means for fluid guidance, in particular a channel or a gutter, and / or a bevel towards the passage opening can be provided subsequently or within the scope of the described casting method.

Further, at least two through holes may be provided which have different geometric shapes from each other. This can also be ensured by the previously discussed casting process.

In particular, casting material may be cast into a mold along a predetermined casting direction, the casting mold having portions or members for defining the location and geometric shape of the through-holes along the casting direction, with a compressive resistance of those portions or elements increasing along the predetermined direction.

Also described is a method for producing a device for inductive energy transmission with a stationary part and a movable part. Here, a stationary part may be provided according to one of the methods of manufacture described in this disclosure. Further, a movable part can be provided and connected to the stationary part. Next, the bellows can be attached to the moving part.

• 1 eine schematische Draufsicht auf einen stationären Teil gemäß einer erfindungsgemäßen Ausführungsform und
• 2 eine schematische Seitenansicht einer erfindungsgemäßen Einrichtung zur induktiven Energieübertragung.

The invention will be explained in more detail with reference to exemplary embodiments. The figures show:

• 1 a schematic plan view of a stationary part according to an embodiment of the invention and
• 2 a schematic side view of a device according to the invention for inductive energy transmission.

In 1 is a schematic plan view of a stationary part 1 a facility 2 shown for inductive energy transfer. The stationary part 1 has a bottom part 3 on. Next, the stationary part 1 a housing section 4 and a receiving section 5 for receiving a movable part 6 (please refer 2 ) on. Next, the stationary part 1 a bellows 7 (please refer 2 ) on the bottom part 3 is attached. The bellows 7 is characterized in plan view by a hatched area. Also shown is a longitudinal direction x and a transverse direction y of a reference coordinate system. The longitudinal direction x and the transverse direction y are oriented perpendicular to each other.

Further shown are one of the bellows 7 covered area 8th , which can also be called indoor, and an area 9 outside of the bellows 7 area, which may also be termed outdoor. The areas 8th . 9 can here subregions of the receiving section 5 of the stationary part 1 be.

Further shown is that the stationary part 1 , in particular the receiving section 5 , in the bottom part 3 Through openings 10 has, wherein the passage openings 10 in the interior 8th are arranged. Further illustrated are further passage openings 11 in the bottom part 3 of the stationary part 1 , in particular of the receiving section 5 , these passage openings 11 in the outdoor area 9 are arranged.

Further illustrated is a wall portion 12 , wherein the wall section 12 outside 9 is arranged. Through the wall section 12 becomes a recording section 13 of the bottom part 3 for the bellows 7 from a cooling passage section 14 separated, wherein the cooling channel section 14 outside 9 is arranged.

It is shown that the through holes 11 outside 9 in the rest section 13 or in an area of the bottom part 3 that is adjacent to the rest section 13 are arranged.

Also shown schematically is a means designed as a groove means 15 for fluid guidance. By means of the gutter 15 can fluid, especially water, from adjacent areas of the through holes 11 towards the respective passage opening 11 be transported.

Next is shown that through holes 11a a first set of through holes 11 are formed circular. Through openings 11b . 11c a second and a third set of through holes 11 are formed slot-shaped. The passage openings 11a . 11b . 11c the first, second and third sets of through holes 11 are arranged outdoors. Through openings 10 a fourth set of passage openings are circular and in the interior 8th arranged.

It is further shown that orientations of the longitudinal axes of the slot-shaped passage openings 11b . 11c are different from each other. In particular, a central longitudinal axis of passage openings 11b the second set of through holes 11b oriented parallel to the transverse direction y, while a central longitudinal axis of passage openings 11c the third set of through holes 11c oriented parallel to the longitudinal direction x.

The stationary part 1 can be made as a casting. In this case, a casting mold can be provided such that casting material from a first longitudinal edge 16a towards a second longitudinal edge 16b of the stationary part to be produced 1 flows into the mold. Here, the casting material flows first to the sections of the mold, which determines the position and formation of the through holes 11a the first set of through holes 11 form, these through holes 11a in the area of the first longitudinal edge 16a are arranged. Further, the casting material flows to portions of the mold, which are the location and formation of the through holes 11b the second set of through holes 11 set, which are arranged in the region of the transverse edges. Third, and finally, the casting material flows through the ports 11c the third set of through holes 11 on, in the second longitudinal edge 16b are arranged, wherein the second longitudinal edge 16b in a flow direction behind the first longitudinal edge 16a is arranged. Thus, the casting material flows along a flow direction parallel to the transverse direction y is oriented.

A pressure resistance of the sections showing the location and formation of the passage openings 11a the first quantity, the passages 11b the second quantity and the passage openings 10 Set the fourth amount, this is less than a pressure resistance of the sections, the location and formation of the through holes 11c the third set of through holes 11 establish.

Next, the pressure resistances of the sections affecting the location and formation of the passage openings 11a the first quantity and the passage openings 11b the second set and the passage openings 10 Set the fourth set, also be different from each other.

Also shown is a bevelled area 17 , which is around a passage opening 10 is arranged indoors. Here is the beveled area 17 designed so that it is towards the passage opening 10 is bevelled. Thus, fluid, especially water, thanks to the tapered surface towards the passage opening 10 flow away.

2 shows a schematic side view of a device according to the invention 2 for inductive energy transfer. Here is the stationary part 1 with the housing section 4 and the receiving section 5 shown. Further shown is the bottom part 3 , the part of the stationary part 1 is. Also shown is a movable part 6 , The moving part 6 can be moved by means not shown for movement in and against a vertical direction z, wherein the vertical direction z is perpendicular to the longitudinal direction x and to the transverse direction y (please refer 1 ) is oriented.

Shown is the moving part 6 in the extended state. When retracted, the moving part is located 6 on a surface of the bottom part 3 , in particular in the receiving section 5 , on.

Shown are the passage openings 11 . 11a in the area of the first longitudinal edge 16a outside 9 are arranged. Further, eg in 1 illustrated through holes 10 11b . 11c , are not shown here. Further illustrated is the wall portion 12 that the pad section 13 for the bellows 7 circulates. It is shown that in a side wall portion of the wall portion 12 Through openings 18 are arranged through the one from the wall section 12 enclosed interior volume 19 with the rest section 13 connected is. Further shown is that the internal volume 19 of the wall section 12 to a bottom of the bottom part 1 is open. This allows water from the support section 13 through the side walls of the wall section 12 drain to the bottom. It is further shown that the bottom of a support structure 19 , For example, a floor or wall, is attached.

3 shows a schematic flow diagram of a method for producing a stationary part 1 , In a first step S1 a bottom part is provided. The bottom part may, as previously explained, be provided by a casting process. Next is at least one through hole 10 . 11 of the stationary part 1 provided. This can be done within the scope of the described casting process.

In a second step S2 becomes a bellows 7 provided and at the bottom part 3 attached. The bellows 7 can in particular with a stationary part-side end portion on the stationary part 1 , in particular on a receiving portion of the stationary part, are attached.

Next, at least two through holes 10 . 11a . 11b . 11c be provided, which have mutually different geometric shapes. This can also be ensured by the previously discussed casting process. In particular, casting material may be cast into a mold along a predetermined casting direction, the casting mold having portions or members for defining the location and geometric shape of the through-holes along the casting direction, with a compressive resistance of those portions or elements increasing along the predetermined direction.

LIST OF REFERENCE NUMBERS

1

stationary part

2

Device for inductive energy transfer

3

the bottom part

4

interior

5

outdoors

6

moving part

7

bellow

8th

interior

9

outdoors

10

Passage opening in the interior

11

Passage opening in the outside area

11a

Through opening of a first set of through holes

11b

Through opening of a second set of through holes

11c

Through opening of a third set of through holes

12

wall section

13

bearing section

14

Cooling duct section

15

gutter

16a

first longitudinal edge

16

the longitudinal edge opposite the first longitudinal edge

17

bevelled area

18

Through opening

19

holding structure

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

• WO 2015/128450 Al [0005]

Claims (11)

Stationary part of a device (2) for inductive energy transfer, wherein the stationary part (1) having a bottom part (3), wherein the stationary part (1) has a bellows (7) which is fixed to the bottom part (3), characterized in that the stationary part has at least one through-opening (10, 11, 18), wherein the at least one through-opening (10, 11, 18) in a region of the bottom part (3) encompassed by the bellows (7) or in an area outside the of the bellows (7) covered area of the bottom part (3) is arranged. Stationary part after Claim 1 , characterized in that a passage opening (10, 11) in a bottom surface of the bottom part (3) is arranged. Stationary part after Claim 1 characterized in that the bottom part (3) comprises or forms a wall portion (12) projecting from a bottom surface of the bottom part (3), the through hole (18) being arranged in the wall portion (12). Stationary part according to one of the preceding claims, characterized in that the stationary part (1) has or forms a support section (13) for a stationary part-side end section of the bellows (7), wherein the at least one through-opening (11) outside the bellows (7 ) is disposed in the region of the bottom part (3) and in an edge section of the support section (13) or in a section of the bottom part (3) adjacent to the support section (13). Stationary part according to one of the preceding claims, characterized in that the bottom part (3) has or forms at least one means for fluid guidance of a fluid towards the at least one passage opening (10, 11). Stationary part according to one of the preceding claims, characterized in that the means for fluid guidance as a channel or as a groove (15) is formed. Stationary part according to one of the preceding claims, characterized in that at least part of the passage opening (10) surrounding portion (17) of the bottom part is bevelled towards the passage opening (10). Stationary part according to one of the preceding claims, characterized in that the bottom part (3) has at least two passage openings (11, 11b, 11c), wherein the passage openings (11a, 11b, 11c) have different geometric shapes from each other. Stationary part according to one of the preceding claims, characterized in that geometric shapes of arranged along a predetermined direction passage openings (11a, 11b, 11c) are selected such that a the through holes (11a, 11b, 11c) associated pressure resistance along the predetermined direction increases wherein the pressure resistance associated with a passage opening (11a, 11b, 11c) is a pressure resistance of a body flowing around against a fluid flowing along the predetermined direction, wherein a flow around outer surface of the body has a geometry corresponding to the passage opening (11a, 11b, 11c). Stationary part according to one of the preceding claims, characterized in that a passage opening (11a), which is arranged in or adjacent to a first section of the support section (13), has a geometric shape which is of a geometric shape of a passage opening (11c), which is arranged in or adjacent to a further section of the support section (13) is different, and / or that a passage opening (11a) which is arranged in a first edge section (16a) of the stationary section (1) has a geometric shape, which is different from a geometric shape of a through hole (11c) disposed in another edge portion (16b) of the stationary part (1). Device for inductive energy transmission with a stationary part (1) according to one of the Claims 1 to 10 , characterized in that the device (2) for inductive energy transmission comprises a movable part (6), wherein the bellows (7) on the movable part (6) is attached.

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