EP2555329A1 - High voltage power connection of an electric machine - Google Patents

High voltage power connection of an electric machine Download PDF

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Publication number
EP2555329A1
EP2555329A1 EP12173499A EP12173499A EP2555329A1 EP 2555329 A1 EP2555329 A1 EP 2555329A1 EP 12173499 A EP12173499 A EP 12173499A EP 12173499 A EP12173499 A EP 12173499A EP 2555329 A1 EP2555329 A1 EP 2555329A1
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EP
European Patent Office
Prior art keywords
power connection
voltage power
connection according
screwing
screw
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12173499A
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German (de)
French (fr)
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EP2555329B1 (en
Inventor
Alexander Schäflein
Matthias Weidner
Wolfgang Purretat
Stefan Keller
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ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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Publication of EP2555329A1 publication Critical patent/EP2555329A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/34—Conductive members located under head of screw
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/26—Connectors or connections adapted for particular applications for vehicles

Definitions

  • the invention relates to a high-voltage power connection of an electrical machine of a vehicle drive train.
  • Such a power connection establishes an electrical connection between an electric traction drive motor and an electrical energy source.
  • a fundamental requirement of the power connection is to realize a power loss as possible low-loss energy transfer and on the other hand this should be structurally simple, reliable and at the same time inexpensive.
  • the electrical power to be transmitted is presently characterized by a current in the range of above about 300 amperes and by a voltage in the range of above about 150 volts.
  • the present invention has the object to represent a high-voltage power connection of an electric machine of a vehicle drive train, which meets the aforementioned requirements.
  • a high-voltage power connection of an electrical machine of a vehicle drive train which first consists of a screw arrangement with a first screwing part, which has a recess with an internal thread and a second screwing part, which is designed as a screw bolt.
  • the latter has a screw head and a shaft which is reduced in diameter relative to the outer shaft and which carries an external thread which corresponds to the internal thread and which is screwed into the first screwing part in a screwing direction.
  • the two aforementioned fitting parts are designed for the transmission of electrical energy from an electrically conductive material.
  • the power connection further consists of an insulating body made of an electrically non-conductive material, to which the first screwing part is fixed, and still further from an electrical machine-side connecting conductor, which is fixed to the first screwed part or connected thereto.
  • a connection element of a connected to a voltage source or connectable electrical connection conductor self-locking, but releasably clamped is a connection element of a connected to a voltage source or connectable electrical connection conductor self-locking, but releasably clamped.
  • the power connection according to the invention meets the aforementioned requirements with respect to a low-loss transmission, constructive simplicity, high reliability and in particular because of the well-defined and low number of parts also in terms of low production costs.
  • On other elements, such as washers, disc springs or other screw in otherwise conventional clamping elements is explicitly omitted in the present invention.
  • the first screwing part is designed as a cylindrical sleeve nut and can be manufactured inexpensively from a semi-finished tube.
  • other forms such as e.g. a cuboid fitting part possible.
  • the connecting element formed preferably as a cable lug with a recess for receiving the screw bolt has, with respect to the screwing direction, two opposing contact surfaces, which in each case lie against abutment surfaces formed on the screw bolt and the first screwing part.
  • the surfaces in contact with each other may also be curved, for example spherical, with respect to the screw axis as lateral surfaces or to increase the electrically effective cross-section.
  • the screw head advantageously has a tool engagement region, which is embodied in a manner known per se as an external or internal polygon for the positive reception of a tool.
  • the contact surface of the screw head has a disk-shaped enlargement with an outer diameter which is widened in relation to the tool engagement region.
  • the bolt is made with respect to the first screwing, so in particular with respect to the sleeve nut of a material with a higher strength.
  • it is proposed to manufacture the first screwed part of an aluminum or copper material and the screw bolt from a steel material.
  • the first screwing part in particular the sleeve nut, may advantageously be connected in a form-fitting manner to the connection line conductor on the electromachine side.
  • the first screw connection part and the electrical machine-side connection conductor can be connected to one another in an inseparable and, in particular, materially bonded manner in order to further reduce the transmission losses.
  • a spatially compact screw arrangement can be realized by the electrical machine-side connection conductor is fixed to the, the screw head facing away from the end portion of the first Verschraubungsteils.
  • the first screw can be rotatably fixed with advantage on or in the insulating body, which can preferably be done by means of a mutual positive connection.
  • the connecting element of the voltage source-side connecting conductor can be fixed in a form-locking fixed position on the insulating body, whereby a lateral movement margin is restricted with respect to the screw axis and the connecting element can be arranged rotationally fixed relative to the first screwing part.
  • a reliable electrical connection in particular under the influence of occurring moisture and the influence of aggressive media, such as salts can be achieved in which the first and second Verschraubungsteil and the connection element of the voltage source side connection conductor are at least partially provided with an electrically conductive corrosion protection layer.
  • the surfaces of the parts can be tinned in particular.
  • the single FIGURE shows a high-voltage power connection 10 of an electric machine, which is provided as a drive in a drive train of a motor vehicle.
  • the type of electrical mesh is not important with respect to the present invention, so it need not be discussed further.
  • the power connection 10 consists of a screwing arrangement 12 with a first, designed here as a sleeve nut screw 14 of a copper material, which has a central recess 14a with an internal thread 15 and a second Verschraubungsteil 16, which is designed as a bolt made of a steel material.
  • the threaded bolt 16 has a screw head 16a and a shaft 16b which is reduced in diameter relative to the outer diameter and has an external thread 17 which corresponds to the internal thread 15 of the sleeve nut 14 and is screwed into the first screwing part 14 over the greater part of its extent.
  • the screw head 16a includes in a conventional manner a trained here as an external hexagon attack area 16c for attacking a mounting tool.
  • the threads of the bolt 16 and the sleeve nut 14 are designed as conventional, in particular metric standard thread, for example as M5, M6, M7, M8, M10 or M12.
  • the power connection 10 further consists of an insulating body 18 made of a non-electrically conductive and temperature-resistant material with respect to the intended application, in particular of a duroplastic or thermoplastic material or of a ceramic.
  • an insulating body 18 made of a non-electrically conductive and temperature-resistant material with respect to the intended application, in particular of a duroplastic or thermoplastic material or of a ceramic.
  • the sleeve nut 14 except for a the end face, the screw head 16a facing end portion completely surrounded by the insulating body 18 and is embedded in this.
  • the outer peripheral surface of the sleeve nut 14 is partially provided with flats, not shown here, which form a positive connection with the insulating body 18 and whereby the sleeve nut 14 with respect to the screw axis rotatably fixed in the insulating body 18.
  • connection conductor 20 likewise made of a copper material, is used, both in a form-fitting and cohesive manner by welding or soldering.
  • This connecting conductor 20, which is only partially illustrated here, is one of a total of three connection conductors of a three-phase stator winding, likewise not shown here, which can supply the electrical machine with electrical energy. In this case, all screwing arrangements of the three phases are fixed to or in one and the same insulating body 18.
  • ends of the conductor rails designed as a connecting conductor 20 are materially bonded to the stator of the electric machine, preferably by soldering or welding depending on the manner of interconnection, ie in a triangular or star connection with three or four annularly curved and concentric on Stator arranged connecting conductors, which in turn are connected to the ends of individual coils of the stator.
  • the power connection 10 still further consists of a connection element 22 in the form of a cable lug, which can be detachably clamped between the screw head 16a and the end face of the sleeve nut 14 opposite this, as can be seen in the figure.
  • the screw head 16a has a contact surface 16d, which is formed there by a disk-shaped enlargement 16f with an outer diameter which is widened with respect to the tool engagement region 16c.
  • the sleeve nut 14 is provided with the formation of an annular collar 14b with an approximately equal contact surface 14c.
  • the connecting element 22 or the cable lug is in a known manner in the screwing with respect to the screwing with two opposite Contact surfaces 22a, b executed, which abut each of these opposing contact surfaces 14c, 16d of bolt 16 and sleeve nut 14.
  • the bolt 16, the sleeve nut 14 and the cable lug 22 are at least partially provided with an electrically conductive corrosion protection layer, in particular with a tin layer.
  • this can also be fixed to the insulating body 18 at least against rotation by means of an additional form-locking connection.
  • the screw is designed to achieve a predetermined clamping force as a function of the geometric parameters of the connection partners and acting between the interacting active surfaces friction coefficients when screwing so that it acts self-locking and can not accidentally solve under the influence of vehicle vibration and temperature changes.

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  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The terminal (10) has a screw connection arrangement (12) comprising a screw fastening part (16) with a shaft (16b) that carries an external thread (17) and is screwed into another screw fastening part (14) in screw fastening direction. Both the screw fastening parts are formed from an electrical conductive material. A connector (22) of an electrical connecting conductor is releasably clamped between a screw head (16a) and the latter screw fastening part, and the conductor is connected with a voltage source. An electric machine-side terminal lead (20) is connected to the latter part. The screw fastening parts are designed as a sleeve nut and a screw bolt, respectively.

Description

Die Erfindung betrifft einen Hochvolt-Leistungsanschluss einer elektrischen Maschine eines Fahrzeugantriebsstranges.The invention relates to a high-voltage power connection of an electrical machine of a vehicle drive train.

Ein derartiger Leistungsanschluss stellt eine elektrische Verbindung zwischen einem elektrischen Fahrantriebsmotor und einer elektrischen Energiequelle her. Eine grundsätzliche Anforderung an den Leistungsanschluss besteht darin, eine möglichst verlustleistungsarme Energieübertragung zu realisieren und zum anderen soll dieser dabei konstruktiv einfach, betriebssicher und zugleich kostengünstig aufgebaut sein. Die zu übertragende elektrische Leistung ist vorliegend durch eine Stromstärke im Bereich von oberhalb etwa 300 Ampere und durch eine Spannung im Bereich von oberhalb etwa 150 Volt gekennzeichnet.Such a power connection establishes an electrical connection between an electric traction drive motor and an electrical energy source. A fundamental requirement of the power connection is to realize a power loss as possible low-loss energy transfer and on the other hand this should be structurally simple, reliable and at the same time inexpensive. The electrical power to be transmitted is presently characterized by a current in the range of above about 300 amperes and by a voltage in the range of above about 150 volts.

Davon ausgehend stellt sich die vorliegende Erfindung die Aufgabe, einen Hochvolt-Leistungsanschluss einer elektrischen Maschine eines Fahrzeugantriebsstranges darzustellen, welcher die vorgenannten Forderungen erfüllt.On this basis, the present invention has the object to represent a high-voltage power connection of an electric machine of a vehicle drive train, which meets the aforementioned requirements.

Diese Aufgabe wird gemäß Patentanspruch 1 gelöst durch einen Hochvolt-Leistungsanschluss einer elektrischen Maschine eines Fahrzeugantriebsstranges, welcher zunächst aus einer Verschraubungsanordnung mit einem ersten Verschraubungsteil, das eine Ausnehmung mit einem Innengewinde aufweist und aus einem zweiten Verschraubungsteil besteht, welches als Schraubbolzen ausgeführt ist. Letzterer besitzt einen Schraubkopf und einen diesem gegenüber im Außendurchmesser reduzierten Schaft, welcher ein zu dem Innengewinde korrespondierendes Außengewinde trägt und der in einer Verschraubungsrichtung in das erste Verschraubungsteil eingeschraubt ist. Dabei sind die beiden genannten Verschraubungsteile zur Übertragung von elektrischer Energie aus einem elektrisch leitfähigen Werkstoff ausgeführt. Der Leistungsanschluss besteht weiter aus einem Isolierkörper aus einem elektrisch nicht leitenden Werkstoff, an welchem das erste Verschraubungsteil festgelegt ist und noch weiter aus einem elektromaschinenseitigen Anschlussleiter, der an dem ersten Verschraubungsteil festgelegt bzw. mit diesem verbunden ist. Dabei ist zwischen dem Schraubkopf und dem ersten Verschraubungsteil ein Anschlusselement eines mit einer Spannungsquelle verbundenen oder verbindbaren elektrischen Verbindungsleiters selbstsichernd, jedoch lösbar eingeklemmt.This object is achieved according to patent claim 1 by a high-voltage power connection of an electrical machine of a vehicle drive train, which first consists of a screw arrangement with a first screwing part, which has a recess with an internal thread and a second screwing part, which is designed as a screw bolt. The latter has a screw head and a shaft which is reduced in diameter relative to the outer shaft and which carries an external thread which corresponds to the internal thread and which is screwed into the first screwing part in a screwing direction. The two aforementioned fitting parts are designed for the transmission of electrical energy from an electrically conductive material. The power connection further consists of an insulating body made of an electrically non-conductive material, to which the first screwing part is fixed, and still further from an electrical machine-side connecting conductor, which is fixed to the first screwed part or connected thereto. In this case, between the screw head and the first screw connection part is a connection element of a connected to a voltage source or connectable electrical connection conductor self-locking, but releasably clamped.

Der erfindungsgemäße Leistungsanschluss erfüllt die eingangs genannten Forderungen hinsichtlich einer verlustleistungsarmen Übertragung, konstruktiver Einfachheit, hoher Betriebssicherheit und insbesondere wegen der genau definierten und geringen Teileanzahl auch hinsichtlich niedriger Herstellungskosten. Auf weitere Elemente, wie Beilegscheiben, Tellerfedern oder weitere bei Schraubverbindungen ansonsten übliche Spannelemente wird im Rahmen der vorliegenden Erfindung ausdrücklich verzichtet.The power connection according to the invention meets the aforementioned requirements with respect to a low-loss transmission, constructive simplicity, high reliability and in particular because of the well-defined and low number of parts also in terms of low production costs. On other elements, such as washers, disc springs or other screw in otherwise conventional clamping elements is explicitly omitted in the present invention.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments and further developments of the invention are specified in the dependent claims.

Gemäß einer ersten vorteilhaften Ausgestaltung ist das erste Verschraubungsteil als zylindrische Hülsenmutter ausgeführt und kann dazu kostengünstig aus einem Rohrhalbzeug gefertigt werden. Es sind hier jedoch grundsätzlich auch andere Formen, wie z.B. ein quaderförmiges Verschraubungsteil möglich.According to a first advantageous embodiment, the first screwing part is designed as a cylindrical sleeve nut and can be manufactured inexpensively from a semi-finished tube. However, in principle, other forms, such as e.g. a cuboid fitting part possible.

Das bevorzugt als Kabelschuh mit einer Ausnehmung zur Aufnahme des Schraubbolzens ausgebildete Anschlusselement weist bezüglich der Verschraubungsrichtung zwei gegenüberliegende Kontaktflächen auf, welche jeweils an dazu gegenüberliegenden, am Schraubbolzen und dem ersten Verschraubungsteil ausgebildeten Anlageflächen anliegen. Die im Anlagekontakt stehenden Flächen können eben, also bezüglich der Schraubenachse als Lateralflächen oder zur Vergrößerung des elektrisch wirksamen Wirkungsquerschnittes auch gekrümmt, bspw. sphärisch ausgeführt sein.The connecting element formed preferably as a cable lug with a recess for receiving the screw bolt has, with respect to the screwing direction, two opposing contact surfaces, which in each case lie against abutment surfaces formed on the screw bolt and the first screwing part. The surfaces in contact with each other may also be curved, for example spherical, with respect to the screw axis as lateral surfaces or to increase the electrically effective cross-section.

Der Schraubkopf weist mit Vorteil einen Werkzeugangriffsbereich auf, welcher in an sich bekannter Art und Weise als Außen- oder Innenmehrkant zur formschlüssigen Aufnahme eines Werkzeuges ausgeführt ist.The screw head advantageously has a tool engagement region, which is embodied in a manner known per se as an external or internal polygon for the positive reception of a tool.

Zur noch weiteren Verbesserung der Stromtragfähigkeit der Schraubverbindung weist die Anlagefläche des Schraubkopfes eine scheibenförmige Erweiterung mit einem gegenüber dem Werkzeugangriffsbereich erweiterten Außendurchmesser auf.For even further improvement of the current carrying capacity of the screw connection, the contact surface of the screw head has a disk-shaped enlargement with an outer diameter which is widened in relation to the tool engagement region.

Mit besonderem Vorteil ist der Schraubbolzen gegenüber dem ersten Verschraubungsteil, also insbesondere gegenüber der Hülsenmutter aus einem Werkstoff mit einer höheren Festigkeit hergestellt. Insbesondere wird vorgeschlagen, das erste Verschraubungsteil aus einem Aluminium- oder Kupferwerkstoff und den Schraubbolzen dabei aus einem Stahlwerkstoff zu fertigen.With particular advantage, the bolt is made with respect to the first screwing, so in particular with respect to the sleeve nut of a material with a higher strength. In particular, it is proposed to manufacture the first screwed part of an aluminum or copper material and the screw bolt from a steel material.

Weiterhin kann vorteilhafterweise das erste Verschraubungsteil, insbesondere die Hülsenmutter formschlüssig mit dem elektromaschinenseitigen Anschlussleiter verbunden werden. Dabei können zur noch weiteren Reduzierung der Übertragungsverluste das erste Verschraubungsteil und der elektromaschinenseitige Anschlussleiter unlösbar und insbesondere stoffschlüssig miteinander verbunden werden. Dazu ist es vorteilhaft, das erste Verschraubungsteil und den elektromaschinenseitige Anschlussleiter im Wesentlichen aus identischen Werkstoffen herzustellen.Furthermore, the first screwing part, in particular the sleeve nut, may advantageously be connected in a form-fitting manner to the connection line conductor on the electromachine side. In this case, the first screw connection part and the electrical machine-side connection conductor can be connected to one another in an inseparable and, in particular, materially bonded manner in order to further reduce the transmission losses. For this purpose, it is advantageous to produce the first screwing part and the electrical machine-side connection conductor essentially of identical materials.

Eine räumlich kompakte Verschraubungsanordnung ist realisierbar, indem der elektromaschinenseitigen Anschlussleiter an dem, dem Schraubkopf abgewandten Endbereich des ersten Verschraubungsteils festgelegt wird.A spatially compact screw arrangement can be realized by the electrical machine-side connection conductor is fixed to the, the screw head facing away from the end portion of the first Verschraubungsteils.

Zur Ermöglichung einer Abstützung eines Montagedrehmoments kann das erste Verschraubungsteil mit Vorteil drehfest an oder in dem Isolierkörper festgelegt werden, was vorzugsweise mittels einer gegenseitigen Formschlussverbindung erfolgen kann.To enable a support of a mounting torque, the first screw can be rotatably fixed with advantage on or in the insulating body, which can preferably be done by means of a mutual positive connection.

Ebenso kann mit Vorteil das Anschlusselement des spannungsquellenseitigen Verbindungsleiters formschlüssig lagefixiert an dem Isolierkörper festgelegt werden, wodurch bezüglich der Schraubenachse ein lateraler Bewegungsspielraum eingeschränkt wird und das Anschlusselement verdrehfest zu dem ersten Verschraubungsteil angeordnet werden kann.Likewise, the connecting element of the voltage source-side connecting conductor can be fixed in a form-locking fixed position on the insulating body, whereby a lateral movement margin is restricted with respect to the screw axis and the connecting element can be arranged rotationally fixed relative to the first screwing part.

Eine zuverlässige elektrische Verbindung, insbesondere unter dem Einfluss von auftretender Feuchte und dem Einfluss von aggressiven Medien, wie zum Beispiel Salzen kann erreicht werden, in dem das erste und zweite Verschraubungsteil und das Anschlusselement des spannungsquellenseitigen Verbindungsleiters zumindest teilweise mit einer elektrisch leitfähigen Korrosionsschutzschicht versehen sind. Hierzu können die Oberflächen der Teile insbesondere verzinnt werden.A reliable electrical connection, in particular under the influence of occurring moisture and the influence of aggressive media, such as salts can be achieved in which the first and second Verschraubungsteil and the connection element of the voltage source side connection conductor are at least partially provided with an electrically conductive corrosion protection layer. For this purpose, the surfaces of the parts can be tinned in particular.

Nachfolgend wird die Erfindung anhand der beigefügten Figur beispielhaft erläutert.The invention will be explained by way of example with reference to the attached FIGURE.

Die einzige Figur zeigt einen Hochvolt-Leistungsanschluss 10 einer elektrischen Maschine, welche als Fahrantrieb in einem Antriebsstranges eines Kraftfahrzeuges vorgesehen ist. Die Bauart der elektrischen Masche ist hinsichtlich der vorliegenden Erfindung nicht von Bedeutung, so dass darauf nicht weiter eingegangen zu werden braucht.The single FIGURE shows a high-voltage power connection 10 of an electric machine, which is provided as a drive in a drive train of a motor vehicle. The type of electrical mesh is not important with respect to the present invention, so it need not be discussed further.

Der Leistungsanschluss 10 besteht aus einer Verschraubungsanordnung 12 mit einem ersten, hier als Hülsenmutter ausgebildeten Verschraubungsteil 14 aus einem Kupferwerkstoff, welches eine zentrale Ausnehmung 14a mit einem Innengewinde 15 aufweist und aus einem zweiten Verschraubungsteil 16, welches als Schraubbolzen aus einem Stahlwerkstoff ausgeführt ist. Der Schraubbolzen 16 weist einen Schraubkopf 16a und einen diesem gegenüber im Außendurchmesser reduzierten Schaft 16b mit einem zu dem Innengewinde 15 der Hülsenmutter 14 korrespondierenden Außengewinde 17 auf und ist auf dem größten Teil seiner Erstreckung in das erste Verschraubungsteil 14 eingeschraubt. Der Schraubkopf 16a umfasst dazu in üblicher Art und Weise einen hier als Außensechskant ausgebildeten Angriffsbereich 16c zum Angriff eines Montagewerkzeugs. Die Gewinde des Schraubbolzens 16 und der Hülsenmutter 14 sind als übliche, insbesondere metrische Normgewinde, beispielsweise als M5, M6, M7, M8, M10 oder M12 ausgeführt.The power connection 10 consists of a screwing arrangement 12 with a first, designed here as a sleeve nut screw 14 of a copper material, which has a central recess 14a with an internal thread 15 and a second Verschraubungsteil 16, which is designed as a bolt made of a steel material. The threaded bolt 16 has a screw head 16a and a shaft 16b which is reduced in diameter relative to the outer diameter and has an external thread 17 which corresponds to the internal thread 15 of the sleeve nut 14 and is screwed into the first screwing part 14 over the greater part of its extent. The screw head 16a includes in a conventional manner a trained here as an external hexagon attack area 16c for attacking a mounting tool. The threads of the bolt 16 and the sleeve nut 14 are designed as conventional, in particular metric standard thread, for example as M5, M6, M7, M8, M10 or M12.

Der Leistungsanschluss 10 besteht weiter aus einem Isolierkörper 18 aus einem elektrisch nicht leitenden und hinsichtlich der vorgesehenen Anwendung temperaturbeständigen Werkstoff, insbesondere aus einem Duro- oder Thermoplastwerkstoff oder aus einer Keramik. In der Figur ist erkennbar, dass die Hülsenmutter 14 bis auf einen stirnseitigen, dem Schraubkopf 16a zugewandten Endbereich vollständig von dem Isolierkörper 18 umgeben bzw. in diesen eingebettet ist. Des weiteren ist die Außenumfangsfläche der Hülsenmutter 14 bereichsweise mit hier nicht gezeigten Abflachungen versehen, welche eine Formschlussverbindung mit dem Isolierkörper 18 ausbilden und wodurch die Hülsenmutter 14 bezüglich der Schraubenachse drehfest in dem Isolierkörper 18 festgelegt ist. An bzw. in dem von dem Schraubbolzen 16 abgewandten Endbereich der Hülsenmutter 14 ist sowohl form- als auch stoffschlüssig durch Verschweißen oder Verlöten ein ebenfalls aus einem Kupferwerkstoff gefertigter Anschlussleiter 20 eingesetzt. Dieser, hier nur teilweise dargestellte Anschlussleiter 20 ist einer von insgesamt drei Anschlussleitern einer hier ebenfalls nicht dargestellten dreiphasige Statorwicklung, welche die elektrische Maschine mit elektrischer Energie versorgen können. Dabei sind alle Verschraubungsanordnungen der drei Phasen an bzw. in ein und demselben Isolierkörper 18 festgelegt. Die hier zeichnerisch nicht dargestellten Enden der als Stromschienen ausgebildeten Anschlussleiter 20 sind am Stator der elektrischen Maschine stoffschlüssig, bevorzugt durch Löten oder Schweißen je nach Art und Weise der Verschaltung, d.h. in einer Dreieck- oder Sternschaltung mit drei bzw. vier ringförmig gebogenen und konzentrisch am Stator angeordneten Verbindungsleitern verbunden, welche wiederum mit den Enden von Einzelspulen des Stators verschaltet sind.The power connection 10 further consists of an insulating body 18 made of a non-electrically conductive and temperature-resistant material with respect to the intended application, in particular of a duroplastic or thermoplastic material or of a ceramic. In the figure it can be seen that the sleeve nut 14 except for a the end face, the screw head 16a facing end portion completely surrounded by the insulating body 18 and is embedded in this. Furthermore, the outer peripheral surface of the sleeve nut 14 is partially provided with flats, not shown here, which form a positive connection with the insulating body 18 and whereby the sleeve nut 14 with respect to the screw axis rotatably fixed in the insulating body 18. At or in the end region of the sleeve nut 14 facing away from the screw bolt 16, a connection conductor 20, likewise made of a copper material, is used, both in a form-fitting and cohesive manner by welding or soldering. This connecting conductor 20, which is only partially illustrated here, is one of a total of three connection conductors of a three-phase stator winding, likewise not shown here, which can supply the electrical machine with electrical energy. In this case, all screwing arrangements of the three phases are fixed to or in one and the same insulating body 18. The illustrated here not shown ends of the conductor rails designed as a connecting conductor 20 are materially bonded to the stator of the electric machine, preferably by soldering or welding depending on the manner of interconnection, ie in a triangular or star connection with three or four annularly curved and concentric on Stator arranged connecting conductors, which in turn are connected to the ends of individual coils of the stator.

Der Leistungsanschluss 10 besteht noch weiter aus einem als Kabelschuh ausgebildeten Anschlusselement 22 eines mit einer Spannungs- oder Stromquelle verbindbaren elektrischen Verbindungsleiters, welcher wie in der Figur sichtbar, zwischen dem Schraubkopf 16a und der diesem gegenüberliegenden Stirnfläche der Hülsenmutter 14 lösbar eingeklemmt ist. Zur Reduzierung der Flächenpressung und gleichzeitig zur Erhöhung der Stromtragfähigkeit weist der Schraubkopf 16a eine Anlagefläche 16d auf, welche dort durch eine scheibenförmige Erweiterung 16f mit einem gegenüber dem Werkzeugangriffsbereich 16c erweiterten Außendurchmesser gebildet ist. Ebenso ist die Hülsenmutter 14 unter Ausbildung eines Ringkragens 14b mit einer etwa gleichgroßen Anlagefläche 14c versehen.The power connection 10 still further consists of a connection element 22 in the form of a cable lug, which can be detachably clamped between the screw head 16a and the end face of the sleeve nut 14 opposite this, as can be seen in the figure. To reduce the surface pressure and at the same time to increase the current carrying capacity, the screw head 16a has a contact surface 16d, which is formed there by a disk-shaped enlargement 16f with an outer diameter which is widened with respect to the tool engagement region 16c. Likewise, the sleeve nut 14 is provided with the formation of an annular collar 14b with an approximately equal contact surface 14c.

Das Anschlusselement 22 bzw. der Kabelschuh ist in bekannter Weise im Verschraubungsbereich bezüglich der Verschraubungsrichtung mit zwei gegenüberliegenden Kontaktflächen 22a, b ausgeführt, welche jeweils an diesen gegenüberliegenden Anlageflächen 14c, 16d von Schraubbolzen 16 und Hülsenmutter 14 anliegen.The connecting element 22 or the cable lug is in a known manner in the screwing with respect to the screwing with two opposite Contact surfaces 22a, b executed, which abut each of these opposing contact surfaces 14c, 16d of bolt 16 and sleeve nut 14.

Der Schraubbolzen 16, die Hülsenmutter 14 und der Kabelschuh 22 sind zumindest teilweise mit einer elektrisch leitfähigen Korrosionsschutzschicht, insbesondere mit einer Zinnschicht versehen.The bolt 16, the sleeve nut 14 and the cable lug 22 are at least partially provided with an electrically conductive corrosion protection layer, in particular with a tin layer.

Des Weiteren kann zur lateralen Festlegung des Kabelschuhs 22 dieser auch mittels einer zusätzlichen Formschlussverbindung zumindest verdrehsicher an dem Isolierkörper 18 festgelegt werden.Furthermore, for the lateral fixing of the cable lug 22, this can also be fixed to the insulating body 18 at least against rotation by means of an additional form-locking connection.

Die Schraubverbindung ist zur Erzielung einer vorbestimmten Klemmkraft in Abhängigkeit von den geometrischen Parametern der Verbindungspartner und den zwischen den miteinander in Eingriff stehenden Wirkflächen wirkenden Reibwerten beim Einschrauben so ausgelegt, dass diese selbstsichernd wirkt und sich unter dem Einfluss von Fahrzeugvibrationen und Temperaturwechseln nicht unbeabsichtigt lösen kann.The screw is designed to achieve a predetermined clamping force as a function of the geometric parameters of the connection partners and acting between the interacting active surfaces friction coefficients when screwing so that it acts self-locking and can not accidentally solve under the influence of vehicle vibration and temperature changes.

Bezugszeichenreference numeral

1010
Leistungsanschlusspower connection
1212
Verschraubungsanordnungbolting
1414
erstes Verschraubungsteilfirst fitting part
14a14a
Ausnehmungrecess
14b14b
Ringkragengorget
14c14c
Anlageflächecontact surface
1515
Innengewindeinner thread
1616
zweites Verschraubungsteilsecond threaded part
16a16a
Schraubkopfscrew head
16b16b
Schaftshaft
16c16c
Angriffsbereichattack range
16d16d
Anlageflächecontact surface
16f16f
scheibenförmige Erweiterungdisc-shaped extension
1717
Außengewindeexternal thread
1818
Isolierkörperinsulator
2020
Anschlussleiterconnecting conductors
2222
Anschlusselementconnecting element
22a, b22a, b
Kontaktflächecontact area

Claims (15)

Hochvolt-Leistungsanschluss (10) einer elektrischen Maschine eines Fahrzeugantriebsstranges, bestehend aus - einer Verschraubungsanordnung (12) mit einem ersten Verschraubungsteil (14), das eine Ausnehmung (14a) mit einem Innengewinde (15) aufweist und mit einem zweiten Verschraubungssteil (16), welches als Schraubbolzen ausgeführt ist und das einen Schraubkopf (16a) und einen diesem gegenüber im Außendurchmesser reduzierten Schaft (16b) aufweist, wobei der Schaft (16b) ein zu dem Innengewinde (15) korrespondierendes Außengewinde (17) trägt und in einer Verschraubungsrichtung in das erste Verschraubungsteil (14) eingeschraubt ist und wobei beide Verschraubungsteile (14,16) aus einem elektrisch leitfähigen Werkstoff ausgeführt sind, weiter bestehend aus - einem Isolierkörper (18) aus einem elektrisch nicht leitenden Werkstoff, an dem das erste Verschraubungsteil (14) festgelegt ist, - einem elektromaschinenseitigen Anschlussleiter (20), der an dem ersten Verschraubungsteil (14) festgelegt ist, wobei - zwischen dem Schraubkopf (16a) und dem ersten Verschraubungsteil (14) ein Anschlusselement (22) eines mit einer Spannungsquelle verbundenen oder verbindbaren elektrischen Verbindungsleiters selbstsichernd, jedoch lösbar eingeklemmt ist. High-voltage power connection (10) of an electric machine of a vehicle drive train, consisting of - A screwing arrangement (12) with a first Verschraubungsteil (14) having a recess (14 a) with an internal thread (15) and with a second Verschraubungssteil (16), which is designed as a bolt and a screw head (16 a) and a this shank (16b) reduced in diameter relative to the outer diameter, wherein the shank (16b) carries an external thread (17) corresponding to the internal thread (15) and is screwed into the first screwing part (14) in a screwing direction and wherein both screwing parts (14, 16) are made of an electrically conductive material, further consisting of - An insulating body (18) made of an electrically non-conductive material to which the first screwing part (14) is fixed, - An electrical machine-side terminal conductor (20) which is fixed to the first screwing part (14), wherein - Between the screw head (16 a) and the first Verschraubungsteil (14) a connection element (22) connected to a voltage source or connectable electrical connection conductor is self-locking, but releasably clamped. Hochvolt-Leistungsanschluss nach Anspruch 1, dadurch gekennzeichnet, dass das erste Verschraubungsteil (14) als Hülsenmutter ausgeführt ist.High-voltage power connection according to claim 1, characterized in that the first screwing part (14) is designed as a sleeve nut. Hochvolt-Leistungsanschluss nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Anschlusselement (22) bezüglich der Verschraubungsrichtung zwei gegenüberliegende Kontaktflächen (22a,b) aufweist, welche jeweils an gegenüberliegenden, am Schraubbolzen (16) und dem ersten Verschraubungsteil (14) ausgebildeten Anlageflächen anliegen.High-voltage power connection according to claim 1 or 2, characterized in that the connecting element (22) with respect to the screwing two opposing contact surfaces (22a, b), each on opposite, on the bolt (16) and the first screwed part (14) formed contact surfaces issue. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass der Schraubkopf (16a) einen Werkzeugangriffsbereich (16c) aufweist.High-voltage power connection according to one of claims 1-3, characterized in that the screw head (16a) has a tool engagement region (16c). Hochvolt-Leistungsanschluss nach Anspruch 4, dadurch gekennzeichnet, dass die Anlagefläche (16d) des Schraubkopfes (16a) eine scheibenförmige Erweiterung (16f) mit einem gegenüber dem Werkzeugangriffsbereich (16c) erweiterten Außendurchmesser aufweist.High-voltage power connection according to claim 4, characterized in that the contact surface (16d) of the screw head (16a) has a disk-shaped extension (16f) with an opposite the tool engagement region (16c) extended outer diameter. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass der Werkstoff des Schraubbolzens (16) gegenüber dem Werkstoff des ersten Verschraubungsteils (14) eine höhere Festigkeit aufweist.High-voltage power connection according to one of claims 1-5, characterized in that the material of the screw bolt (16) relative to the material of the first Verschraubungsteils (14) has a higher strength. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-6, dadurch gekennzeichnet, dass das erste Verschraubungsteil (14) aus einem Aluminium- oder Kupferwerkstoff besteht.High-voltage power connection according to one of claims 1-6, characterized in that the first screwing part (14) consists of an aluminum or copper material. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass der Schraubbolzen (16) aus einem Stahlwerkstoff besteht.High-voltage power connection according to one of claims 1-7, characterized in that the screw bolt (16) consists of a steel material. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-8, dadurch gekennzeichnet, dass das erste Verschraubungsteil (14) und der elektromaschinenseitige Anschlussleiter (20) formschlüssig miteinander verbunden sind.High-voltage power connection according to one of claims 1-8, characterized in that the first screwing part (14) and the electrical machine-side connecting conductor (20) are positively connected to each other. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-9, dadurch gekennzeichnet, dass das erste Verschraubungsteil (14) und der elektromaschinenseitige Anschlussleiter (20) unlösbar miteinander verbunden sind.High-voltage power connection according to one of claims 1-9, characterized in that the first screwing part (14) and the electrical machine-side connecting conductor (20) are permanently connected to each other. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-10, dadurch gekennzeichnet, dass der elektromaschinenseitigen Anschlussleiter (20) an dem, dem Schraubkopf (16a) abgewandten Endbereich des ersten Verschraubungsteil (14)s festgelegt ist.High-voltage power connection according to one of claims 1-10, characterized in that the electrical machine-side connection conductor (20) is fixed to the, the screw head (16a) facing away from the end of the first Verschraubungsteil (14) s. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-11, dadurch gekennzeichnet, dass das erste Verschraubungsteil (14) und der elektromaschinenseitige Anschlussleiter (20) aus im Wesentlichen identischen Werkstoffen hergestellt sind.High-voltage power connection according to one of claims 1-11, characterized in that the first screwing part (14) and the electrical machine-side connecting conductor (20) are made of substantially identical materials. Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-12, dadurch gekennzeichnet, dass das erste Verschraubungsteil (14) drehfest in dem Isolierkörper (18) festgelegt ist.High-voltage power connection according to one of claims 1-12, characterized in that the first screwing part (14) is fixed in rotation in the insulating body (18). Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-13, dadurch gekennzeichnet, dass das Anschlusselement (22) des spannungsquellenseitigen Verbindungsleiters formschlüssig lagefixiert an dem Isolierkörper (18) festgelegt ist.High-voltage power connection according to one of claims 1-13, characterized in that the connection element (22) of the voltage source-side connecting conductor is fixed in a form-locking fixed in position on the insulating body (18). Hochvolt-Leistungsanschluss nach einem der Ansprüche 1-14, dadurch gekennzeichnet, dass das erste und zweite Verschraubungsteil (14,16) und das Anschlusselement (22) des spannungsquellenseitigen Verbindungsleiters zumindest teilweise mit einer elektrisch leitfähigen Korrosionsschutzschicht versehen sind.High-voltage power connection according to one of claims 1-14, characterized in that the first and second screwed part (14, 16) and the connection element (22) of the voltage source-side connecting conductor are at least partially provided with an electrically conductive corrosion protection layer.
EP12173499.0A 2011-08-02 2012-06-26 High voltage power connection of an electric machine Active EP2555329B1 (en)

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