WO2024028116A1

WO2024028116A1 - Electromotive refrigerant compressor

Info

Publication number: WO2024028116A1
Application number: PCT/EP2023/070112
Authority: WO
Inventors: Moritz STOLZ; Christopher LIEPOLD; Benedikt Dremel; Markus Rauch
Original assignee: Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg
Priority date: 2022-08-02
Filing date: 2023-07-20
Publication date: 2024-02-08
Also published as: DE102022207990A1

Abstract

The invention relates to an electromotive refrigerant compressor (8) of a motor vehicle (2), with a housing (10) which has a motor compartment (16), in which a stator (22) of an electric motor (20) is arranged. The motor compartment (16) is separated by means of a dividing wall (14) from an electronics compartment (18), in which a printed circuit board (34) is arranged, wherein a plated-through hole (36) which makes electrical contact with the stator (22) is routed through the dividing wall (14). The plated-through hole (36) makes electrical contact with the printed circuit board (34) by means of press-in technology.

Description

Electromotive refrigerant compressor

The invention relates to an electromotive refrigerant compressor of a motor vehicle, with a housing that has a motor compartment. A stator of an electric motor is arranged in the motor compartment, and the motor compartment is separated by a partition from an electronics compartment in which a circuit board is arranged.

To control the temperature of an interior, motor vehicles, such as passenger cars, usually have an air conditioning system that includes a refrigeration circuit. Here, a refrigerant is compressed by means of a compressor head of a refrigerant compressor, which is subsequently fed to a heat exchanger which is supplied with ambient air. By means of this, the compressed refrigerant, which is in the liquid state, adjusts its temperature to the ambient air. The refrigerant is then fed to an evaporator, through which evaporation occurs, so that the temperature of the refrigerant is reduced. A component to be cooled, such as a fan line into the interior of the motor vehicle, is cooled by means of a subsequent heat exchanger. The relaxed refrigerant, which has been heated due to the thermal exchange with the component, is fed back to the refrigerant compressor.

The compressor head is driven, for example, by means of a main drive of the motor vehicle, such as an internal combustion engine. To ensure that the air conditioning system can operate even when the motor vehicle is at a standstill, the refrigerant compressor is increasingly being designed with an electric motor, so that the compressor head is driven by an electric motor of the refrigerant compressor. This also means the cooling capacity provided by the air conditioning system regardless of the speed of the combustion engine. Furthermore, the complexity of assembling the internal combustion engine is reduced in this way. In this way, it is also possible to use such an air conditioning system, for example in a battery-electric motor vehicle, in which case the interior or batteries of the motor vehicle can be cooled by means of the air conditioning system.

The electric motor of the electromotive refrigerant compressor is usually designed as a brushless DC motor and therefore has a stator with several electrical coils. To power this, electronics is usually provided, which includes a circuit board that is electrically contacted with the coils. For example, welded or soldered connections are used for contacting. If the circuit board and the stator are already arranged within a housing of the electromotive refrigerant compressor, the space required to produce the electrical contact is limited, which is why production is difficult. It is necessary to realize a minimum housing size, which is why space requirements and material costs are increased.

In an alternative, the electrical contact is made, for example, by means of leaf springs attached to the electrical coils, which are supported on corresponding contact surfaces of the circuit board. The space required for creation is therefore reduced. However, if the electromotive refrigerant compressor is shaken, it is possible that due to the elastically equipped leaf springs, they will briefly detach from the respective associated contact surface, so that an arc is formed between them. Due to the resulting heat, the leaf spring and the associated contact surface weld together upon renewed contact, and the welding point can tear open again if there is further vibration. Thus, during operation, the roughness of the surfaces increases, which is why electrical resistance increases. Due to the increased electrical resistance, heating occurs during operation, which in turn leads to brief welding and, due to the subsequent tearing, to a further increase in the roughness of the surface can lead. To avoid this, it is necessary to provide the leaf springs and/or the contact surfaces with a coating, which, however, increases manufacturing costs.

The invention is based on the object of specifying a particularly suitable electromotive refrigerant compressor for a motor vehicle, in particular robustness being increased, and assembly expediently being simplified and/or manufacturing costs being reduced.

According to the invention, this object is achieved by the features of claim 1. Advantageous further training and refinements are the subject of the subclaims.

The electric refrigerant compressor is a component of a motor vehicle. The electromotive refrigerant compressor is therefore suitable, in particular intended and set up, to be mounted on other components of the motor vehicle. The motor vehicle is suitably land-based and, for example, a passenger car (passenger car). Alternatively, the motor vehicle is a commercial vehicle, for example a truck or a bus.

The electromotive refrigerant compressor has a housing that has a motor compartment and an electronics compartment. In particular here is. The engine compartment and the electronics compartment are separated from each other by a partition. In particular, the motor compartment is separated from the electronics compartment in a fluid-tight manner, so that a transfer of fluid between the motor compartment and the electronics compartment, in particular a liquid, is prevented during operation of the electromotive refrigerant compressor. The housing is expediently essentially hollow cylindrical, with the partition wall being arranged in particular perpendicular to the axis of the hollow cylinder. Preferably the housing is in one piece. The housing is suitably made of a metal, for example aluminum, i.e. pure aluminum or an aluminum alloy, so that the robustness is increased, but the weight of the housing is comparatively low. The housing is suitably created by deep drawing, which simplifies production. A stator of an electric motor and expediently also a rotor of the electric motor are arranged in the motor compartment. In particular, a compressor head of the electromotive refrigerant compressor, which is, for example, a scroll compressor, is driven by means of the rotor. Suitably the electric motor is a brushless direct current (BLDC) motor. In particular, the stator is designed to be hollow cylindrical and is preferably attached to an inner wall of the housing. For example, the rotor is surrounded on the circumference by means of the stator, which has, for example, one or more permanent magnets. In particular, the stator has several electrical coils, which are expediently connected to form several (electrical) phases. The electrical coils are preferably attached to a common laminated core. Each of the phases is suitably assigned the same number of electrical coils. In particular, the electrical phases are electrically contacted with one another to form a delta or star connection.

The electronics compartment is in particular closed by means of a cover which is attached to the housing, for example releasably or non-detachably. The cover is preferably attached to the housing in a fluid-tight manner, so that unwanted penetration of fluids into the electronics compartment is avoided. Here, for example, the cover is screwed to the housing, with a seal suitably present between them. Alternatively, the cover is welded to the housing, for example.

A circuit board is arranged within the electronics compartment, by means of which in particular electronics or at least an electrical circuit is provided. In particular, several electrical and/or electronic components are attached to the circuit board for this purpose. The circuit is expediently such that a bridge circuit is realized by means of it, which suitably has a plurality of semiconductor switches. In other words, the bridge circuit is at least partially provided by means of the printed circuit board, in particular a B6 circuit. In particular, the bridge circuit is designed depending on the number of possible electrical phases of the stator. For example, means The circuit board also has a driver circuit for any semiconductor switches of the bridge circuit connected and/or other control and/or regulation.

A plated-through hole with which the stator is electrically contacted is guided through the partition wall. Here, the plated-through connection is expediently electrically contacted with at least one of the possible electrical coils, for example directly or via another component which is expediently arranged in the engine compartment. In addition, the through-hole is electrically contacted with the circuit board. This makes it possible to energize the stator using the circuit board via the plated-through hole and thus operate the electric motor. In particular, the electric motor is operated depending on a desired cooling capacity and/or compressor capacity of the electromotive refrigerant compressor. The partition preferably has a through opening through which the plated-through hole is guided. In this case, a fluid tightness is created particularly in the area of the through opening, for example by means of a seal, so that despite the through opening the motor compartment is fluidly separated from the electronics compartment.

The circuit board is contacted with the plated-through hole using press-in technology. In other words, a so-called press fit is used for electrical contacting/connecting the circuit board to the plated-through hole. A solderless connection technology is therefore preferably used, in which a contact pin of the via is pressed into a metallized hole, in particular a via, of the circuit board during creation. The diagonal of the cross section of the contact pin is preferably larger than the diameter of the hole in the circuit board. In particular, a gas-tight electrical connection is created by pressing/cutting the edges of the contact pin into the metallization of the hole in the circuit board.

For example, the contact pin is designed to be non-compressible, with the cross section being, for example, square and/or having several longitudinal grooves. When pressed into the hole of the circuit board, the hole, especially the edge of the hole, deformed, for example elastic and/or plastic. Alternatively, the contact pin, which is designed, for example, in the manner of a sleeve or cylindrical, is flexible and/or elastic, so that it is at least partially elastically deformed when inserted into the hole. A bias voltage is thus generated, which is why the electrical contact between the via and the circuit board is maintained. In particular, the contact pin has a needle-eye-like opening, which is elastically reduced in size when inserted into the hole, so that a frictional connection is created between the contact pin and the hole.

Due to the use of the press-in technology, the installation space required to create the electrical contact between the through-hole and the circuit board is comparatively small, and it is possible, for example, to provide the housing with the through-hole. The circuit board is then inserted into the electronics compartment, whereby the electrical contact is made. No additional tools or installation space are required to produce the connection/contact using press-in technology, which is why the housing size requirement is reduced. This means that material costs and manufacturing costs are reduced and assembly is made easier. It is also possible to essentially fill the entire electronics compartment using the circuit board, which is why the range of functions provided by the circuit board can be increased. Miniaturization of the circuit board is also not necessary, which is why the manufacturing costs are further reduced.

If the electromotive refrigerant compressor is shaken during operation, the circuit board will not be detached from the through-hole, in particular any contact pin of the through-hole from the hole. Even with comparatively large vibrations, at most the contact pin is only moved within the hole, with mechanical contact always being maintained. This prevents the formation of an arc or the like, which increases robustness. Particularly preferably, several such plated-through holes are present, the number of plated-through holes being particularly dependent on the interconnection of any electrical phases. In particular, each of the possible electrical phases of the electric motor is assigned at least one of the plated-through holes. In particular, during operation, a refrigerant is passed through the motor compartment so that the stator is cooled by means of it. Due to the fluid-tight separation of the electronics compartment from the motor compartment, there is no impact on the circuit board.

For example, the plated-through hole is designed in one piece with any contact pin. Particularly preferably, however, the through-hole has a bolt which is guided through the partition and at whose free end, which is arranged in the electronics compartment, the contact element is attached. The contact element is used to connect to the circuit board using press-in technology. In particular, the contact element is soldered to the bolt or, particularly preferably, welded. Due to the use of the contact element, it is possible to manufacture it separately from the bolt or, for example, to use a standard component. Manufacturing costs are therefore further reduced. Preferably, the contact element is made of a different material than the bolt. Suitably, the bolt is made of a comparatively robust material, which increases robustness. Alternatively or in combination, the bolt is made of the same material as the partition so that they have the same temperature behavior. For example, the bolt is created separately from any electrical coils of the stator and is made, for example, from iron, copper or aluminum. Preferably, a material is used in which the motor compartment is separated from the electronics compartment in a fluid-tight manner. Alternatively, the bolt is formed onto one of the electrical coils and is provided, for example, by means of a coil end of one of the electrical coils. The number of required components and the number of assembly steps required are therefore reduced. The contact element is expediently made of a material with a comparatively high elasticity. This means that the connection to the circuit board is comparatively secure. For example, the contact element is made of brass or copper.

For example, the contact element only has a single contact pin. However, the contact element is particularly preferably fork-shaped and therefore has at least two, preferably exactly two, contact pins. Each of the contact pins is assigned a corresponding hole in the circuit board. This means that even if one of the contact pins is damaged, for example during assembly or during operation, there is still an electrical connection, which is why robustness is increased.

For example, the through-hole is attached to the partition and, for example, completely enclosed by it. In other words, the through opening of the partition is completely filled by the plated-through hole. Here, for example, a press fit or a clearance fit is formed between the plated-through hole and the through opening. This also provides a fluid-tight separation of the engine compartment from the electronics compartment.

Alternatively, a gap is formed between these, so that an electrical short circuit of the plated-through via the partition is avoided. In particular, the plated-through hole is guided through an opening in a carrier plate and held there. Suitably, the plated-through hole is attached to the carrier plate in a fluid-tight manner. The support plate is attached to the partition. In this way, positioning the through-hole with respect to the possible through-opening of the partition is made easier, and it is possible, for example, to position the through-hole at a desired distance from the edge of the through-opening. To attach the plated-through hole, all that is required is to attach the partition to the carrier plate, which makes production easier. In particular, the carrier plate lies flat against the partition. The space requirement is therefore reduced and the carrier plate is stabilized with the partition, which increases robustness. Due to the carrier plate The through-hole is also easier to handle, which is why damage during assembly is avoided.

The carrier plate is made, for example, from a metal, preferably aluminum or particularly preferably the same material as the partition. In particular, the material of the carrier plate has the same expansion behavior and/or temperature behavior as the material of the partition, so that even when heated or comparatively cool, no mechanical stresses arise between them, which would otherwise lead to detachment, damage or the development of a leak could.

For example, the carrier plate is connected to the partition wall in a fluid-tight manner, for example by welding. This ensures fluid tightness. A seal is particularly preferably connected to the carrier plate, namely on the side facing the partition. The through-hole is surrounded by the seal. The entry of a fluid between the partition wall and the carrier plate through to any through opening in the partition wall is thus prevented by means of the seal, which is why a seal is present despite the through opening. For example, the seal rests on the plated-through hole. However, the seal is particularly preferably spaced from the plated-through hole. In other words, there is a distance between the seal and the via. As a result, it is possible to increase the size of any through opening, so that assembly is simplified, while still achieving a seal. The seal is made, for example, from a rubber, a rubber or particularly preferably from a rubber/metal. During assembly, the seal is, for example, elastically and/or plastically deformed, so that a comparatively high seal is achieved.

For example, the carrier plate is arranged in the electronics compartment. However, the carrier plate is particularly preferably arranged in the engine compartment. This means that if there is increased pressure in the engine compartment, especially if this is the case Any refrigerant is passed, the carrier plate is pressed against the partition, which is why the tightness is further increased.

For example, for assembly, the through-hole is guided through any through opening in the partition and the through-hole is suitably aligned with respect to the circuit board and/or the stator. However, the carrier plate particularly preferably has a guide opening, within which a guide pin of the partition lies. The guide pin is expediently attached to a base body of the partition, which is designed, for example, flat. In particular, the guide pin is integral with the base body of the partition, which increases stability. The guide pin is preferably formed on the base body of the partition. By means of the guide bolt and the guide opening, the carrier plate is aligned with respect to the partition and thus also the through-hole with respect to any through opening, which is why assembly is simplified.

For example, the guide pin and the guide opening are cylindrical. This makes production easier. However, it is particularly preferred for the guide opening and the guide pin to be conical. This makes it easier to insert the guide pin into the guide opening, with the carrier plate getting closer to the partition wall being positioned more precisely relative to one another and thus also the through-hole with respect to the partition wall, in particular the possible through opening.

Preferably, in the assembled state, a clearance fit is created between the guide bolt and the guide opening. Comparatively precise positioning is thus achieved, with the effort required being reduced. In particular, the guide opening is like a blind hole, so that despite this, the electronics compartment is still fluidly separated from the engine compartment. Suitably, the seal is also present, and the seal preferably also surrounds the guide pin and the guide opening. This also prevents fluid from penetrating there. For example, there is only a single guide opening and a single such guide pin. However, it is particularly preferred that several of these are present, expediently exactly two. This means that the carrier plate is precisely aligned with respect to the partition, and the position of the carrier plate with respect to the partition is clearly specified.

For example, the carrier plate is welded to the partition. However, the carrier plate is particularly preferably attached to the partition wall by means of a screw. This creates a detachable connection, which makes repairs easier. In this way, no additional installation space is required for producing the welded connection, and the screw connection can be created using comparatively inexpensive and space-saving tools. It is therefore possible to further reduce the size of the housing. Furthermore, a comparatively stable mechanical connection is created that holds up even at comparatively high temperatures. In addition, it is possible to use the screw connection to achieve a comparatively high contact pressure of the carrier plate on the partition, so that tightness is further increased. In particular, the carrier plate has a screw opening for this purpose, into which a screw is screwed, which is passed through the partition. The screw opening in particular has an internal thread. Preferably, the screw is passed through the partition from the electronics compartment, so that for assembly, the carrier plate can first be attached to the stator, which is then inserted into the motor compartment. It is not necessary to reserve space in the motor compartment for access to the screw, so that the design freedom for the stator is increased. In particular, the partition has a mounting opening through which the screw is guided. For example, the mounting opening has an internal thread. However, the assembly opening is particularly preferably designed to be smooth. This makes it easier to create the contact pressure of the carrier plate on the partition.

For example, the screw opening is continuous or, particularly preferably, blind hole-like. This means that despite the screw opening, no fluid connection is created between the electronics compartment and the engine compartment. In particular is The screw opening is surrounded by the seal so that any mounting opening is also surrounded by the seal. This also prevents fluid from passing between the engine compartment and the electronics compartment. For example, there is only one such screw. However, it is particularly preferred that at least two, preferably exactly two, such screws and associated screw openings and/or mounting openings are present. This means that contact pressure is evened out and robustness is increased, while the space requirement is still comparatively small.

For example, the carrier plate rests mechanically directly on the plated-through hole, and the plated-through hole is, for example, enclosed and/or encapsulated by the material of the carrier plate. In other words, a cohesive connection is realized between them. This increases robustness and prevents the through-hole from becoming detached from the carrier plate. Particularly preferably, however, the through-hole is spaced from an edge of the opening, so that there is no direct mechanical contact between the through-hole and the carrier plate. The carrier plate is therefore also electrically insulated from the plated-through hole, and a short circuit of the plated-through hole with other components of the electromotive refrigerant compressor is avoided.

In particular, a gap between the via and the edge of the opening is filled with a glass. In particular, for production, the glass is molded or flowed around the through-hole, so that in particular a cohesive connection of the through-hole to the carrier plate takes place by means of the glass. Robustness is thus increased. Due to the use of the glass, electrical insulation is present, and no damage occurs even with the existing temperatures and temperature differences. By means of the glass, a fluid-tight connection of the through-hole to the carrier plate is achieved.

For example, only the gap is filled with the glass and the glass is flush with a surface of the carrier plate. However, it is particularly preferred that it protrudes the glass extends beyond the gap, so that even further areas of the vias are surrounded by the glass, in particular the area of the vias which is arranged within the possible through opening of the partition. This also prevents an electrical short circuit there. Preferably, the glass only protrudes over the support plate on one side, which is why the space required is reduced. For example, the thickness of the glass is constant. However, the glass is particularly preferably designed to be conically tapered, with the pointed end being spaced from the carrier plate. Arranging the via in the possible through opening is therefore Hertz. In addition, due to the increased glass volume, the plated-through hole is held and stabilized comparatively stably on the carrier plate.

In an alternative embodiment, the electromotive refrigerant compressor comprises a plastic holder that has a base body and a collar connected to it. Here, the collar is connected to a free end of the base body, which is designed in particular as a hollow cylindrical shape. In other words, a cross section of the plastic holder is T-shaped or the plastic holder is, for example, rivet-shaped. The base body is inserted into the opening, and the via is held by means of the base body. In particular, the base body is hollow cylindrical, and the via is surrounded by the base body on the circumference. For production, the through-hole is preferably overmolded using the material of the plastic holder, so that a captive connection is realized. For assembly, the base body is inserted into the opening from the side facing away from the partition, so that the collar is on the side facing away from the partition. The collar lies against the carrier plate in the assembled state. In particular, the collar has a greater extent than the opening and therefore protrudes beyond the opening.

By means of the collar, insertion of the plated-through hole through the opening is limited, which is why assembly is simplified. If there is a higher pressure in the motor compartment than in the electronics compartment during operation, the collar is pressed against the carrier plate so that between the plastic holder and the carrier plate has a comparatively large creepage distance, which increases tightness. This also prevents a change in position of the plastic holder and thus also of the plated-through hole.

Alternatively or in combination with the increased creepage distance due to the collar, a sealing ring is present, preferably an O-ring. This is expediently inserted into a circumferential slot in the base body, which is suitably located within the opening. This also prevents fluid from penetrating there.

The base body expediently projects beyond the support plate on the side facing the partition wall, and in the assembled state the base body is in particular at least partially arranged within the possible through opening. This means that a seal is also achieved there by means of the plastic holder. For example, the base body is made of solid material on the side facing away from the collar. However, it is particularly preferred that it has a circumferential slot running in the longitudinal direction of the base body. In this way, an elastic and/or plastic deformation of the free end facing away from the collar is made possible by means of the possible through opening, so that in particular a non-positive contact and therefore a seal is achieved.

Appropriately, there are several such plated-through holes, with each of the plated-through holes, for example, being assigned a corresponding carrier plate. However, it is particularly preferred that several, preferably all, through-holes are held on the carrier plate. Thus, by mounting the carrier plate, all plated-through holes are also mounted on the housing and, in particular, electrically contacted with the circuit board, which is why manufacturing time is further shortened. The number of fasteners for fastening the individual plated-through holes on the partition is reduced. In particular, there are only two screws for attaching the carrier plate to the partition. Preferably, the plated-through holes and the connection to the carrier plate are identical to one another. Because of By connecting the plated-through holes to the carrier plate, it is possible to manufacture them as a common module, which is created, for example, separately from other components of the electromotive refrigerant compressor. This makes assembly easier. In particular, the electromotive refrigerant compressor includes a total of three plated-through holes that are held on the carrier plate.

For example, the carrier plate is rectangular. This makes production easier. The carrier plate is particularly preferably designed in an arc shape. Consequently, utilization of space is improved, particularly if the housing is designed to be essentially hollow cylindrical, i.e. the partition is designed to be particularly round or at least partially round. Suitably, the arc is designed such that a center of the arc lies on a rotation axis of the rotor of the electric motor, and the plated-through holes are essentially the same distance from the rotation axis. This makes contacting the individual coils of the stator easier. For example, the carrier plate is designed in a ring shape and is arranged concentrically to the rotor axis. However, the circular arc is particularly preferably such that a center angle is less than 90°. Consequently, a space requirement is reduced. In this way, contacting with the circuit board also takes place in a comparatively small spatial area, so that space utilization of the circuit board is improved, and in particular a length of conductor tracks on the circuit board is shortened. Electromagnetic compatibility is therefore improved.

The invention further relates to a motor vehicle with such an electromotive refrigerant compressor. Preferably, the electromotive refrigerant compressor is a component of a refrigerant circuit and/or an air conditioning system. During operation, the air conditioning system is used, for example, to control the temperature of an interior of the motor vehicle or an energy storage unit of the motor vehicle, such as a high-voltage battery. The advantages and developments mentioned in connection with the electric refrigerant compressor can also be applied to the motor vehicle and vice versa.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Show in it:

1 shows schematically a motor vehicle with an electromotive refrigerant compressor which has a plurality of plated-through holes which are held on a carrier plate,

Fig. 2, perspective detail of the plated-through holes that are electrically contacted with a circuit board.

3 shows in perspective the through-holes held on the carrier plate,

4 shows a longitudinal section of one of the plated-through holes,

5 according to FIG. 3 shows an alternative embodiment of the plated-through holes held on the carrier plate, and

Fig. 6 shows a longitudinal section of one of the plated-through holes according to Fig. 5

Corresponding parts are provided with the same reference numbers in all figures.

In Figure 1, a motor vehicle 2 is shown schematically in the form of a passenger car (car). The motor vehicle 2 has a plurality of wheels 4, by means of which contact with a road (not shown) takes place, and at least some of which are driven by means of a main drive. The wheels 4 are connected to a body 6 via a chassis. An electromotive refrigerant compressor 8, which is part of a refrigerant circuit, is also attached to the body 6. An interior space surrounded by the body 6 is cooled by means of the refrigerant circuit. For this purpose, the refrigerant circuit comprises a heat exchanger, which is fluidly connected downstream of the electromotive refrigerant compressor 8, and by means of which a heated refrigerant is cooled. For this purpose, the heat exchanger is exposed to ambient air. Dem Downstream of the heat exchanger is an evaporator, by means of which the supplied refrigerant is evaporated, so that the pressure and temperature of the refrigerant are reduced. The cooled refrigerant is fed to a further heat exchanger, which is thermally contacted with a fan line into an interior of the motor vehicle. The refrigerant heated and expanded in this way is fed to the electromotive refrigerant compressor 8, by means of which the refrigerant is compressed again, resulting in heating.

The electromotive refrigerant compressor 8 has a housing 10 that is made of aluminum by deep drawing. The housing 10 is essentially hollow cylindrical and extends along a rotation axis 12. Inside the housing 10 there is a partition 14 arranged perpendicular to the rotation axis 12, by means of which the housing 12 is divided into a motor compartment 16 and an electronics compartment 18. In other words, the motor compartment 16 is separated from the electronics compartment 18 by means of the partition 14 of the housing 10. The partition 14 is formed on other components of the housing 10, which is in one piece.

An electric motor 20, which is designed as a brushless DC motor, is arranged within the motor compartment 16. The electric motor 20 has a hollow cylindrical stator 22, which includes several electrical coils, not shown, which are attached to a common laminated core. The electrical coils are divided into three phases, with each phase assigned the same number of electrical coils. The stator 22 is arranged concentrically to the axis of rotation 12 and surrounds a rotor 24, which is also arranged concentrically to the axis of rotation 12 and lies on it. The rotor 24 has several permanent magnets and is rotatably mounted about the axis of rotation 12 by means of bearings (not shown).

By means of the rotor 24, a compressor head 26 is driven on the side facing away from the partition 14, which is designed as a scroll compressor and which opens into an outlet 28. An inlet 30 also opens into the motor compartment 16, namely on the side of the rotor 24 facing the partition 14. During operation the refrigerant is introduced via the inlet 30 into the motor compartment 16, which is sucked in by the compressor head 26, so that the refrigerant is moved between the stator 22 and the rotor 24 to the compressor head 26 and consequently cools the electric motor 20. The compressor head 26 compresses the refrigerant, which is subsequently expelled via the outlet 28.

The electronics compartment 18 is closed on the side opposite the partition 40 by means of a cover 32, which is fastened to the housing 10 by means of screws (not shown). A printed circuit board 34 arranged parallel to the partition 14 and the cover 32 is positioned within the electronics compartment 18. Several electrical and/or electronic components are attached to the circuit board 34, so that an electrical circuit is formed. This includes a bridge circuit and a driver circuit for it. The bridge circuit is designed in such a way that it can be used to supply current to the electric motor 20, namely the stator 22.

For the electrical contacting of the circuit board 34 with the stator 22, there are three plated-through holes 36, of which only one is shown. These are each electrically contacted directly with the circuit board 34 and guided through an assigned through opening 38 in the partition 14. The plated-through holes 36 are passed through and attached to a common carrier plate 40, which is made of aluminum. The carrier plate 40 is located within the engine compartment 16 and lies flat against a base body 42 of the partition 14, the base body 42 of the partition 14 being essentially flat and arranged perpendicular to the axis of rotation 12. Two guide bolts 44, of which only one is shown, are formed on the base body 42 of the partition 14 and project parallel to the axis of rotation 12 and into the motor compartment 16. The guide pins

44 are truncated and therefore conical, with the tapered ends pointing into the engine compartment 16. Each guide pin 44 lies in a blind hole-like guide opening, forming a clearance fit

45 of the carrier plate 40. The carrier plate 40 is attached to the partition 14 by means of two screws 46, only one of which is shown here. A screw head 48 of each screw 46 is located in the electronics compartment 18, and each screw 48 is guided through a respective mounting opening 50 of the partition 14, namely the base body 42, and screwed into a respective screw opening 52. Each screw opening 42 is like a blind hole and has an internal thread. The mounting openings 50, on the other hand, are designed to be smooth.

For assembly, the stator 22 is electrically connected to the plated-through holes 36, which are attached to the carrier plate 40, with each of the phases being assigned one of the plated-through holes 36. The composite is subsequently inserted into the motor compartment 16, with each plated-through hole 36 being passed through the respective through opening 38. The screws 48 are then inserted from the electronics compartment 18 through the respective mounting opening 50 and screwed into the screw openings 52. By turning the screws 46, it is possible to adjust the contact pressure of the carrier plate 40 on the base body 42 of the partition 14.

A circumferential seal 54, which is made of metal and rubber, is connected to the support plate 14 on the side facing the partition 14. The seal 54 is arranged essentially on the edge of the carrier plate 40, so that the through-contacts 36, the through opening 38, the guide bolts 44 and the mounting openings 50 are surrounded by this. By adjusting the contact pressure using the screws 46, the seal 54 is suitably deformed so that there is a seal. Consequently, the refrigerant is prevented from passing from the engine compartment 16 through the through openings 38 and/or the mounting openings 50 into the electronics compartment 18, and the electronics compartment 18 is fluidically separated from the engine compartment 16.

2 shows a perspective detail of the plated-through holes 36, which are electrically directly contacted with the circuit board 34 shown in a semi-transparent manner. The plated-through holes 36 each have a cylindrical bolt 56, which essentially passes through the carrier plate 40 is arranged parallel to the axis of rotation 56. A contact element 58 is welded to the free end of each bolt 56 positioned within the electronics compartment 18, which is fork-shaped and has two contact pins 60 pointing away from the respective bolt 56 and arranged parallel to it.

The contact pins 60 each have a needle-eye-like opening 62 and are guided through an associated hole in the circuit board 34, which is metallized and contacted with a conductor track, not shown, in the circuit board 34. The cross section of each contact pin 60 in the unassembled state is larger than the cross section of the respective hole 64, so that when the contact pins 60 are inserted into the respectively assigned holes 64, they are elastically deformed, so that a frictional connection is created. Consequently, the electrical contacting of the plated-through holes 36 takes place with the circuit board 34 using press-in technology, and the plated-through holes 36 are therefore designed in the manner of press fits.

In Figure 3, the through-holes 36, which are held on the carrier plate 40, are shown in perspective, and in Figure 4, one of the through-holes 36 and the circuit board 40 are shown in a sectional view along the longitudinal axis of the associated bolt 56. The carrier plate 40 is designed in an arc shape, with the two screw openings 52 located at both ends. The plated-through holes 36 are located between the ends, each of the plated-through holes 36, namely the respective bolt 56, being guided through an associated opening 66 in the carrier plate 40. The conically shaped guide openings 45 are located between adjacent plated-through holes 36.

A gap 68 is formed between each bolt 56 and the associated opening 66. In other words, each plated-through hole 36, namely the respective bolt 56, is spaced from an edge 70 of the respectively assigned opening 66. Each gap 68 is filled with a glass 72, the glass protruding over the support plate 40 on the side facing the partition 14 and conically tapering against the respective associated bolt 56. The respective conical area lies at least partially inside in the assembled state the associated through opening 38 of the partition 14, so that the glass 72 is used to electrically insulate the respective plated-through hole 36 from both the carrier plate 40 and the partition 14. The glass 72 also prevents the refrigerant from passing through the opening 76. The bolt 56 is made of iron, so that the glass 72 adheres comparatively securely to the bolt 56. At the end arranged in the motor compartment 16, one of the electrical coils of the respective assigned phase is welded to each bolt 56 and is thus electrically contacted. The respective contact element 58, which is made of copper, is welded to the opposite end of the bolt 56.

5 and 6 show an alternative embodiment of the plated-through holes 36 according to FIG. 3 and FIG has respective arrangement to each other. In this variant, each plated-through hole 36 also has the bolt 56, which in this variant is made of copper. The end of each bolt 56 arranged in the motor compartment 16 is in turn welded or soldered to the associated electrical coil in the assembled state. In a variant not shown in detail, the bolts 56 are formed directly with the respective associated coil end, so that fewer assembly steps are required.

The respective contact element 58 is in turn connected to the free end of each bolt 56 arranged in the electronics compartment 18 and electrically contacted with it, for example by means of welding or soldering. The shape of the contact elements 58 is also not changed, and these are in turn designed fork-shaped and have the two contact pins 60 with the respective needle-eye-like opening 62.

The respective gap 68 is in turn formed between each bolt 56 and the edge 70 of the respectively assigned opening 66 of the carrier plate 40. However, a base body 72 of a plastic holder 74 is inserted into each of these. Everyone Base body 72 of the respective plastic holder 74 is designed to be essentially hollow cylindrical and surrounds the associated bolt 56 on the circumference. In addition, the base body 72 lies non-positively against the edge 70 of the respectively assigned opening 76. At the end facing the stator 22, a disc-shaped collar 76, which runs perpendicular to the base body 72 of the plastic holder 74 and projects outwards, is formed on the base body 72 of each plastic holder 74 and partially covers the carrier plate 40. By means of this, insertion of the plastic holder 74 into the respective opening 66 from the side facing away from the partition 14 is limited. In summary, each plated-through connection 36, namely the respective associated bolts 56, is held by means of the base body 72 of the respective plastic holder 74 inserted into the respective opening 66, the respective base body 72 being inserted into the respective opening 66 from the side facing away from the partition 14. Each collar 76 also lies flat against the carrier plate 40.

In the base body 72 of each plastic holder 74, a circumferential slot 78 is made in its circumference, within which an O-ring 80 made of rubber is inserted. The O-ring 80 is held non-positively between the edge 70 of the opening 66 and the base body 72 of the plastic holder 74, so that the passage of refrigerant through the opening 66 is prevented. On the side of the carrier plate 40 facing the partition 14, the base body 72 of each plastic holder 74 projects beyond the carrier plate 40 and has a gap 82 running in the longitudinal direction, i.e. parallel to the bolt 56, at the end. In the assembled state, this free end is arranged within the respectively assigned through-opening 38, with a slight deformation of the respective plastic holder 74 being possible due to the gap 82, so that a non-positive contact follows there. Consequently, a fluid-tight connection is also created there.

The invention is not limited to the exemplary embodiments described above. Rather, other variants of the invention can also be derived from this by the person skilled in the art without departing from the subject matter of the invention. In particular, all are related to the individual Individual features described in the exemplary embodiments can also be combined with one another in other ways without departing from the subject matter of the invention.

Reference symbol list

2 motor vehicle

4 wheel

6 body

8 electromotive refrigerant compressor

10 cases

12 axis of rotation

14 partition

16 engine compartment

18 electronics compartment

20 electric motor

22 stator

24 rotors

26 compressor head

28 outlet

30 entrance

32 lids

34 circuit board

36 via

38 passage opening

40 carrier plate

42 basic body of the partition

44 guide bolts

45 guide opening

46 screw

48 screw head

50 mounting opening

52 screw opening

54 seal

56 bolts

58 contact element

60 contact pin 62 needle-eye-like opening

64 holes

66 opening

68 gap 70 margin

72 base body of the plastic holder

74 plastic holders

76 collars

78 slot 80 O-ring

82 gaps

Claims

Claims Electromotive refrigerant compressor (8) of a motor vehicle (2), with a housing (10) which has a motor compartment (16) in which a stator (22) of an electric motor (20) is arranged, and by means of a partition (14) is separated from an electronics compartment (18) in which a circuit board (34) is arranged, a through-hole (36) being passed through the partition (14), which is electrically contacted with the stator (22), and wherein the through-hole ( 36) is electrically contacted with the circuit board (34) using press-in technology. Electromotive refrigerant compressor (8) according to claim 1, characterized in that the plated-through hole (36) has a bolt (56), at the free end of which a fork-shaped contact element (58) is arranged in the electronics compartment (18). Electromotive refrigerant compressor (8) according to claim 1 or 2, characterized in that the plated-through connection (36) is guided through and held on an opening (66) of a carrier plate (40) which is attached to the partition (14). Electromotive refrigerant compressor (8) according to claim 3, characterized in that a seal (54) is connected to the carrier plate (40) on the side facing the partition (14), by means of which the plated-through hole (36) is surrounded. Electromotive refrigerant compressor (8) according to claim 3 or 4, characterized in that the carrier plate (40) has a blind hole-like guide opening (45), within which a conical guide pin (44) of the partition (14) lies. Electromotive refrigerant compressor (8) according to one of claims 3 to 5, characterized in that the carrier plate (40) has a blind hole-like screw opening (52) into which a screw (46) guided through the partition (14) is screwed. Electromotive refrigerant compressor (8) according to one of claims 3 to 6, characterized in that the via (36) is spaced from an edge (70) of the opening (66), with a gap (68) between the via (36) and the Edge (70) is filled with glass (72). Electromotive refrigerant compressor (8) according to one of claims 3 to 6, characterized in that the through-contact (36) is held by means of a base body (72) of a plastic holder (74) inserted into the opening (66) and which is held by the partition (14 ) side facing away is inserted into the opening (66), with a collar (76) connected to the base body (72) resting on the carrier plate (40). Electromotive refrigerant compressor (8) according to one of claims 3 to 8, characterized in that several such plated-through holes (36) are guided through the carrier plate (40) and held thereon.