EP3053254A1 - Wheel hub drive - Google Patents

Wheel hub drive

Info

Publication number
EP3053254A1
EP3053254A1 EP14793478.0A EP14793478A EP3053254A1 EP 3053254 A1 EP3053254 A1 EP 3053254A1 EP 14793478 A EP14793478 A EP 14793478A EP 3053254 A1 EP3053254 A1 EP 3053254A1
Authority
EP
European Patent Office
Prior art keywords
ring structure
rotor
wheel hub
hub drive
coefficient
Prior art date
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.)
Withdrawn
Application number
EP14793478.0A
Other languages
German (de)
French (fr)
Inventor
Klaus Schleicher
Gunter Freitag
Harald Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP3053254A1 publication Critical patent/EP3053254A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/40—Electrical machine applications
    • B60L2220/44—Wheel Hub motors, i.e. integrated in the wheel hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2270/00—Problem solutions or means not otherwise provided for
    • B60L2270/10—Emission reduction
    • B60L2270/14—Emission reduction of noise
    • B60L2270/145—Structure borne vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the invention relates to an arrangement according to the preamble of claim 1.
  • a wheel hub drive or a wheel hub motor is a motor that is installed directly in a wheel of a vehicle.
  • electric motors are usually used for a wheel hub drive.
  • a major advantage of electric wheel hub drives is the elimination of the classic drive train. Typically, wheel hub motors are only supported on one side.
  • the mechanical system of a wheel hub motor has only a low tilting rigidity.
  • the low tilting rigidity results in higher relative movements of the rotating and stationary components under load to one another.
  • the relative movements in turn lead to contact of the rotating and stationary components and thus can cause damage.
  • transverse accelerations for example when cornering and / or during resonant excitations through the roadway, such defective contact with the components can occur.
  • Fahrzeu ⁇ gen with a filigree suspension geometry the effects mentioned.
  • the present invention is therefore an object of the invention to provide a wheel hub drive, which reduces the damage of touch.
  • the wheel hub drive according to the invention comprises a Elektromo ⁇ tor, wherein the electric motor comprises a stator and a sleeve-shaped rotor.
  • the electric motor comprises a stator and a sleeve-shaped rotor.
  • a coaxially aligned with the rotor ring structure is arranged on at least one of the rotor in the axial direction limiting plane surface.
  • OF INVENTION ⁇ dung has, according to the ring structure to a smaller Gleitrei ⁇ bung coefficient than a limiting plane surface of the rotor.
  • the wheel hub drive according to the invention has the advantage that upon contact of the rotor with another component of the wheel hub drive, the defectiveness of the contact is greatly reduced by the smaller sliding friction coefficient of the ring structure.
  • the Gleitrei ⁇ bung coefficients of the ring structure is smaller, in particular GR sentlich smaller than the limiting end face of the rotor so that upon contact of the rotor to other components under load are no significant damage to the rotor and / or on the contact member.
  • rotating sliding layer which is formed by the ring structure with Klei ⁇ neren sliding friction coefficient, the mechanical structure of example housing and storage in a reasonable mass and volume ratio based on the performance can be designed. Also, the necessary
  • Stiffness and / or strength of the rotor is not affected by the ring ⁇ structure. According to the invention, therefore, touching the components is not exclusively prevented, but the damage of the contact of the components vermin ⁇ changed.
  • advantageous ⁇ adhesive enough the installation space of the wheel hub drive is reduced as a whole. Splintering and / or scarring on the rotor are advantageously avoided by the ring structure attached to the rotor and associated with the rotor.
  • the ring structure is positively and / or non-positively connected to the rotor.
  • the ring structure is connected by means of screw connections to the rotor, wherein at least a portion of the ring structure has an axial projection with respect to the screw connections.
  • a frictional connection between the ring structure and rotor is provided by the screw connections, which withstands the loads during contact of the rotor or the ring structure with another component.
  • the ring structure has an axial projection with respect to the screw connections, so that contact between stationary components and the screw connections is avoided. This reduces damage to the rotor and other components.
  • Senknuten may be incorporated in the ring structure, so that by means of countersunk screws ⁇ the axial projection of the ring structure is possible.
  • the ring structure is connected by means of clip connections to the rotor.
  • the ring structure comprises the material Teflon.
  • Teflon has an extremely low coefficient of sliding friction, so that damage that occurs in contact between the sliding surfaces (ring structure) and another component can be significantly reduced.
  • the sliding friction coefficient of the ring structure with respect to a Ge ⁇ housing is less than 0.04.
  • the housing expediently comprises the rotor and / or stator.
  • an inner and outer diameter of the ring structure have a magnitude difference of at most 10 mm.
  • the ring structure is thereby formed as a thin ⁇ ner ring disc-like, so that the Bauraumbe ⁇ may, which results from the additional ring structure, can be kept as low as possible.
  • the ring structure to a coating, wherein a sliding frictional coefficient of the coating is less ⁇ , especially Wesent ⁇ Lich less than the sliding friction coefficient of the ring structure.
  • this additionally improves the sliding friction properties of the ring structure compared to the limiting plane surfaces of the rotor.
  • Figure 1 shows a non-contact operation of a wheel hub drive
  • Figure 2 illustrates a contact of components under load
  • Figure 3 shows a schematic representation of a ring structure.
  • FIG. 1 shows a section of a wheel hub drive 1 along an axis of rotation 8 (axial direction), the wheel hub drive 1 comprising an electric motor with a stator 2 and a rotor 4.
  • the stator 2 and the rotor 4 are within a housing 14, which in turn within a
  • Rim 16 is located. For clarity, only one wheel with a tire 18 is shown. In general, all Rä ⁇ of a vehicle, not shown, can be provided with the illustrated in Figure 1 wheel hub drive. 1
  • the tire 18 rotates about the axis of rotation 8.
  • the rotor 4 is torque ⁇ conclusively connected to a bolt circle 6 of the rim 16, wherein the bolt circle 6 and the rim 16 are arranged coaxially to the axis of rotation 8 ⁇ .
  • the bolt circle 6 is in turn torque-connected via rim bolts (not shown) to the rim 16, the rim 16 driving the tire 18.
  • the housing 14 additionally has at least one housing cover 26.
  • the rotor 4 and the bolt circle 6 are supported by a pivot bearing 20.
  • a ring structure 10 is arranged in each case. To save space, it is advantageous air gaps, for example between rotor 4 and
  • Stator 2 and / or between rotor 4 and housing 14 to keep as small as possible.
  • contact between components, for example rotor 4 and housing 14 can only be avoided with difficulty during a load.
  • the ring structure 10 is provided according to the invention.
  • Figure 2 shows a contact 22, 24 of the ring structure 10 with the housing 14 or the housing cover 26. Occurs under a load of the wheel hub drive, for example, by vibrations on a tilting of the rotor 4, so touch
  • Ring structure 10 and housing 14 or housing cover 26 at the contact points 22, 24 Due to the particularly good sliding properties of the ring structure 10, the damage to the Be Reaching points 22, 24 kept as low as possible.
  • the rotor 4 is not in direct contact with the housing 14 or the housing cover 26 during a tilting stress.
  • the ring structure 10 is mainly stressed by the friction forces.
  • damage to the rotor 4 or other components during a tilting load is advantageously avoided.
  • the ring structure 10 thus forms a Notlauf orraum.
  • FIG. 3 shows a schematic representation of the ring structure 10.
  • the ring structure 10 has an inner diameter 28 and an outer diameter 30.
  • the difference in magnitude of the inner and outer diameters 28, 30 is less than or equal to 10 mm.
  • the keptrelie- 10 has as a thin disc 10 te ring structure has a plurality of Senknuten 34 which are regularly over a surface 32 of the ring structure 10 divides ⁇ ver.
  • the Senknuten 34 allow a positive and / or non-positive attachment of the ring structure 10 to the rotor 4 by means of countersunk screws.
  • 10 is provided with a material to be ⁇ layers that a lower coefficient of sliding friction than said ring structure 10.
  • the ring structure 10 can be advantageously manufactured at low cost by injection molding with little technical effort, the surface 32 of the ring structure.

Abstract

A wheel hub drive (1) is disclosed, having an electric motor, wherein the electric motor comprises a stator (2) and a sleeve-shaped rotor (4), a ring structure (10) that is coaxial to the rotor (4) is arranged on at least one inner mounting surface (12) that delimits the rotor (4) in the axial direction (8), and the ring structure (10) exhibits a smaller coefficient of sliding friction than the inner mounting surface (12) that delimits the rotor (4).

Description

Beschreibung Radnabenantrieb Die Erfindung betrifft eine Anordnung gemäß dem Oberbegriff des Patentanspruches 1. Description Wheel Hub Drive The invention relates to an arrangement according to the preamble of claim 1.
Ein Radnabenantrieb oder ein Radnabenmotor ist ein Motor, der direkt in einem Rad eines Fahrzeuges eingebaut ist. Nach dem Stand der Technik werden meist elektrische Motoren für einen Radnabenantrieb eingesetzt. Ein wesentlicher Vorteil von Elektroradnabenantrieben ist der Wegfall des klassischen Antriebsstranges . Typischerweise sind Radnabenmotoren nur einseitig gelagert.A wheel hub drive or a wheel hub motor is a motor that is installed directly in a wheel of a vehicle. In the prior art, electric motors are usually used for a wheel hub drive. A major advantage of electric wheel hub drives is the elimination of the classic drive train. Typically, wheel hub motors are only supported on one side.
Dadurch weist das mechanische System eines Radnabenmotors nur eine geringe Kippsteifigkeit auf. Durch die geringe Kipp- steifigkeit ergeben sich höhere Relativbewegungen der rotierenden und stehenden Bauteile unter Belastung zueinander. Die Relativbewegungen wiederum führen zu Berührungen der rotierenden und stehenden Bauteile und können somit Schäden zur Folge haben. Insbesondere bei Querbeschleunigungen, beispielsweise bei Kurvenfahrten und/oder bei resonanten Anregungen durch die Fahrbahn, können solche schadhaften Berüh- rungen der Bauteile auftreten. Hinzu kommt, dass bei Fahrzeu¬ gen mit einer filigranen Fahrwerksgeometrie die genannten Effekte verstärkt werden. As a result, the mechanical system of a wheel hub motor has only a low tilting rigidity. The low tilting rigidity results in higher relative movements of the rotating and stationary components under load to one another. The relative movements in turn lead to contact of the rotating and stationary components and thus can cause damage. Particularly in the case of transverse accelerations, for example when cornering and / or during resonant excitations through the roadway, such defective contact with the components can occur. On top of that are amplified in Fahrzeu ¬ gen with a filigree suspension geometry, the effects mentioned.
Nach dem Stand der Technik wird versucht mit großen axialen Luftspalten die schadhaften Berührungen der Bauteile zu vermeiden. Hieraus ergibt sich jedoch der unmittelbare Nachteil, dass der Bauraumbedarf durch die unnötigen Luftspalte und durch die vergrößerten Abstände der Bauteile erhöht wird. Um die Nachteile bekannter Radnabenantriebe zu überwinden schlägt der Stand der Technik daher speziell entwickelte Rad¬ nabenantriebe vor, die insbesondere eine erhöhte Steifigkeit aufweisen und/oder größere Lager und/oder andere Materialien verwenden. Nachteilig daran ist, dass die bekannten Konzepte für Radnabenantriebe nur unter großem Aufwand und unter gro¬ ßen Konstruktionsänderungen übernommen werden können. Insbesondere weisen bekannte kostengünstige Lager keine genügende Kippsteifigkeit auf, um eine Berührung der rotierenden Bau¬ teile während einer Belastung zu vermeiden. According to the state of the art, attempts are made with large axial air gaps to avoid defective contact with the components. However, this results in the immediate disadvantage that the space requirement is increased by the unnecessary air gaps and by the increased spacing of the components. To overcome the disadvantages of known hub reduction therefore proposes to the prior art, specially designed wheel hub drives ¬ before that particular exhibit an increased stiffness and / or greater storage and / or other materials use. The disadvantage of this is that the known concepts for wheel hub drives can be adopted only with great effort and under large ¬ design changes. In particular, known inexpensive bearing no sufficient tilt resistance in order to avoid a contact of the rotating parts during construction ¬ a load.
Der vorliegenden Erfindung liegt folglich die Aufgabe zugrunde einen Radnabenantrieb anzugeben, der die Schadhaftigkeit von Berührungen vermindert. The present invention is therefore an object of the invention to provide a wheel hub drive, which reduces the damage of touch.
Die Aufgabe wird durch eine Anordnung mit den Merkmalen des unabhängigen Anspruches gelöst. In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltung und Weiterbildungen der Er- findung angegeben. The object is achieved by an arrangement having the features of the independent claim. In the dependent claims advantageous embodiment and further developments of the invention are given.
Der erfindungsgemäße Radnabenantrieb umfasst einen Elektromo¬ tor, wobei der Elektromotor einen Stator und eine hülsenför- migen Rotor umfasst. Hierbei ist an wenigstens einer den Ro- tor in axialer Richtung begrenzenden Planfläche eine koaxial mit dem Rotor ausgerichtete Ringstruktur angeordnet. Erfin¬ dungsgemäß weist die Ringstruktur einen kleineren Gleitrei¬ bungskoeffizienten als die eine begrenzende Planfläche des Rotors auf. The wheel hub drive according to the invention comprises a Elektromo ¬ tor, wherein the electric motor comprises a stator and a sleeve-shaped rotor. Here, a coaxially aligned with the rotor ring structure is arranged on at least one of the rotor in the axial direction limiting plane surface. OF INVENTION ¬ dung has, according to the ring structure to a smaller Gleitrei ¬ bung coefficient than a limiting plane surface of the rotor.
Die relativen Begriffe axial und radial beziehen sich stets auf eine Drehachse des Rotors. The relative terms axial and radial always refer to a rotational axis of the rotor.
Der erfindungsgemäße Radnabenantrieb weist den Vorteil auf, dass bei einer Berührung des Rotors mit einem weiteren Bauteil des Radnabenantriebs die Schadhaftigkeit der Berührung durch den kleineren Gleitreibungskoeffizienten der Ringstruktur stark reduziert wird. Erfindungsgemäß ist der Gleitrei¬ bungskoeffizienten der Ringstruktur kleiner, insbesondere we- sentlich kleiner, als die begrenzende Planfläche des Rotors, so dass bei einer Berührung des Rotors mit weiteren Bauteilen unter Belastung keine wesentlichen Schäden am Rotor und/oder am berührenden Bauteil entstehen. Durch die erfindungsgemäße rotierende Gleitschicht, die durch die Ringstruktur mit klei¬ neren Gleitreibungskoeffizienten ausgebildet wird, kann die mechanische Struktur von beispielsweise Gehäuse und Lagerung in einem vernünftigen Massen- und Volumenverhältnis bezogen auf die Leistung ausgelegt werden. Auch wird die nötige The wheel hub drive according to the invention has the advantage that upon contact of the rotor with another component of the wheel hub drive, the defectiveness of the contact is greatly reduced by the smaller sliding friction coefficient of the ring structure. According to the invention the Gleitrei ¬ bung coefficients of the ring structure is smaller, in particular GR sentlich smaller than the limiting end face of the rotor so that upon contact of the rotor to other components under load are no significant damage to the rotor and / or on the contact member. By the invention rotating sliding layer, which is formed by the ring structure with Klei ¬ neren sliding friction coefficient, the mechanical structure of example housing and storage in a reasonable mass and volume ratio based on the performance can be designed. Also, the necessary
Steifigkeit und/oder Festigkeit des Rotors durch die Ring¬ struktur nicht beeinflusst. Erfindungsgemäß wird somit ein Berühren der Bauteile nicht ausschließlich verhindert, sondern die Schadhaftigkeit der Berührung der Bauteile vermin¬ dert. Dadurch ergibt sich der Vorteil, dass insbesondere kleinere Lager oder Standardlager mit üblichen Materialien für den Radnabenantrieb verwendet werden können. Sonderbau¬ teile oder starke konstruktive Änderungen entfallen, wodurch ein deutlicher Kostenvorteil entsteht. Überdies wird vorteil¬ hafterweise der Bauraumbedarf des Radnabenantriebs insgesamt verringert. Absplitterungen und/oder Schrammen am Rotor werden vorteilhafter Weise durch die am Rotor angebrachte und zum Rotor zugehörige Ringstruktur vermieden. Stiffness and / or strength of the rotor is not affected by the ring ¬ structure. According to the invention, therefore, touching the components is not exclusively prevented, but the damage of the contact of the components vermin ¬ changed. This results in the advantage that in particular smaller bearings or standard bearings can be used with conventional materials for the wheel hub drive. Special construction ¬ parts or major structural changes omitted, creating a significant cost advantage. Moreover advantageous ¬ adhesive enough, the installation space of the wheel hub drive is reduced as a whole. Splintering and / or scarring on the rotor are advantageously avoided by the ring structure attached to the rotor and associated with the rotor.
Gemäß einer vorteilhaften Ausgestaltung der Erfindung ist die Ringstruktur form- und/oder kraftschlüssig mit dem Rotor verbunden . According to an advantageous embodiment of the invention, the ring structure is positively and / or non-positively connected to the rotor.
Dadurch wird sichergestellt, dass bei einer Berührung, die während einer Belastung auftritt, die Ringstruktur weiterhin fest mit dem Rotor verbunden ist. Vorteilhafterweise kann da¬ durch ein Abreiben und/oder ein Ablösen der Ringstruktur vom Rotor vermieden werden. Durch die formschlüssige Verbindung wird sichergestellt, dass die Kraft, die bei einer Berührung der Bauteile während einer Belastung auftritt, gleichmäßig auf eine größtmögliche Fläche verteilt wird. This ensures that, in the event of a contact occurring during a load, the ring structure is still firmly connected to the rotor. Advantageously, it is possible to avoid abrasion and / or detachment of the ring structure from the rotor. The positive connection ensures that the force that occurs when the components come into contact with each other during a load is distributed evenly over the largest possible area.
Gemäß einer weiteren vorteilhaften Ausgestaltung ist die Ringstruktur mittels Schraubenverbindungen mit dem Rotor verbunden, wobei wenigstens ein Teilbereich der Ringstruktur eine axialen Überstand bezüglich der Schraubenverbindungen aufweist. Vorteilhafterweise wird durch die Schraubenverbindungen eine kraftschlüssige Verbindung zwischen Ringstruktur und Rotor geschaffen, die den Belastungen während einer Berührung des Rotors bzw. der Ringstruktur mit einem weiteren Bauteil standhält. Dabei weist die Ringstruktur einen axialen Überstand bezüglich der Schraubenverbindungen auf, so dass eine Berührung von stehenden Bauteilen mit den Schraubverbindungen vermieden wird. Dadurch werden Schäden am Rotor und weiteren Bauteilen verringert. Beispielsweise können Senknuten in der Ringstruktur eingebracht sein, so dass mittels Senkkopf¬ schrauben der axiale Überstand der Ringstruktur ermöglicht wird . According to a further advantageous embodiment, the ring structure is connected by means of screw connections to the rotor, wherein at least a portion of the ring structure has an axial projection with respect to the screw connections. Advantageously, a frictional connection between the ring structure and rotor is provided by the screw connections, which withstands the loads during contact of the rotor or the ring structure with another component. In this case, the ring structure has an axial projection with respect to the screw connections, so that contact between stationary components and the screw connections is avoided. This reduces damage to the rotor and other components. For example, Senknuten may be incorporated in the ring structure, so that by means of countersunk screws ¬ the axial projection of the ring structure is possible.
In einer vorteilhaften Weiterbildung der Erfindung ist die Ringstruktur mittels Klippverbindungen mit dem Rotor verbunden . In an advantageous embodiment of the invention, the ring structure is connected by means of clip connections to the rotor.
Vorteilhafterweise wird dadurch ein Zusammenbau des Radnaben¬ antriebs erleichtert. Advantageously, an assembly of the wheel hub ¬ drive is facilitated.
In einer weiteren vorteilhaften Weiterbildung der Erfindung umfasst die Ringstruktur das Material Teflon. In a further advantageous development of the invention, the ring structure comprises the material Teflon.
Teflon weist einen äußert geringen Gleitreibungskoeffizienten auf, so dass Schäden, die bei einer Berührung zwischen den Gleitflächen (Ringstruktur) und einem weiteren Bauteil entstehen signifikant verringert werden können. Teflon has an extremely low coefficient of sliding friction, so that damage that occurs in contact between the sliding surfaces (ring structure) and another component can be significantly reduced.
Gemäß einer vorteilhaften Ausgestaltung der Erfindung ist der Gleitreibungskoeffizient der Ringstruktur bezogen auf ein Ge¬ häuse kleiner gleich 0,04. According to an advantageous embodiment of the invention, the sliding friction coefficient of the ring structure with respect to a Ge ¬ housing is less than 0.04.
Vorteilhafterweise werden durch den geringen Gleitreibungsko¬ effizienten der Ringstruktur Schäden an der Ringstruktur und/oder am Gehäuse bei einer Berührung während einer Belastung vermieden. Hierbei umfasst das Gehäuse zweckmäßigerweise den Rotor und/oder Stator. Gemäß einer weiteren vorteilhaften Ausgestaltung weisen ein innerer und äußerer Durchmesser der Ringstruktur eine betragsmäßige Differenz von höchstens 10 mm auf. Vorteilhafterweise ist die Ringstruktur dadurch als ein dün¬ ner Ring scheibenartig ausgebildet, so dass der Bauraumbe¬ darf, der sich aus der zusätzlichen Ringstruktur ergibt, möglichst gering gehalten werden kann. In einer vorteilhaften Weiterbildung der Erfindung weist die Ringstruktur eine Beschichtung auf, wobei ein Gleitreibungs¬ koeffizient der Beschichtung geringer, insbesondere wesent¬ lich geringer als der Gleitreibungskoeffizient der Ringstruktur ist. Advantageously, damage to the ring structure and / or on the housing are avoided in a contact during a load due to the low Gleitreibungsko ¬ efficient the ring structure. In this case, the housing expediently comprises the rotor and / or stator. According to a further advantageous embodiment, an inner and outer diameter of the ring structure have a magnitude difference of at most 10 mm. Advantageously, the ring structure is thereby formed as a thin ¬ ner ring disc-like, so that the Bauraumbe ¬ may, which results from the additional ring structure, can be kept as low as possible. In an advantageous development of the invention, the ring structure to a coating, wherein a sliding frictional coefficient of the coating is less ¬, especially Wesent ¬ Lich less than the sliding friction coefficient of the ring structure.
Vorteilhafterweise werden dadurch die Gleitreibungseigenschaften der Ringstruktur gegenüber den begrenzenden Planflächen des Rotors zusätzlich verbessert. Beispielsweise ist ei¬ ne zusätzliche Beschichtung mit gängigen Kunststoffen insbesondere mit Teflon von Vorteil. Advantageously, this additionally improves the sliding friction properties of the ring structure compared to the limiting plane surfaces of the rotor. For example, ei ¬ ne additional coating with common plastics, especially with Teflon advantage.
Die Erfindung wird nachfolgend anhand eines bevorzugten Aus¬ führungsbeispiels unter Bezugnahme auf die angehängten Zeich¬ nungen beschrieben, in der The invention is described below with reference to a preferred embodiment and with from ¬ reference to the appended drawing ¬ voltages in which
Figur 1 einen berührungsfreien Betrieb eines Radnabenantriebs darstellt; Figure 1 shows a non-contact operation of a wheel hub drive;
Figur 2 eine Berührung von Bauteilen unter Belastung verdeutlicht ; Figure 2 illustrates a contact of components under load;
Figur 3 eine schematische Darstellung einer Ringstruktur zeigt . Figure 3 shows a schematic representation of a ring structure.
Gleichartige Elemente werden in Figuren mit denselben Bezugs zeichen versehen. Figur 1 zeigt einen Schnitt eines Radnabenantrieb 1 entlang einer Drehachse 8 (axiale Richtung) , wobei der Radnabenantrieb 1 einen Elektromotor mit einem Stator 2 und einem Rotor 4 umfasst. Hierbei sind der Stator 2 und der Rotor 4 inner- halb eines Gehäuses 14, das sich wiederum innerhalb einerSimilar elements are provided in characters with the same reference characters. FIG. 1 shows a section of a wheel hub drive 1 along an axis of rotation 8 (axial direction), the wheel hub drive 1 comprising an electric motor with a stator 2 and a rotor 4. Here, the stator 2 and the rotor 4 are within a housing 14, which in turn within a
Felge 16 befindet, angeordnet. Zur Verdeutlichung ist nur ein Rad mit einem Reifen 18 dargestellt. Generell können alle Rä¬ der eines nicht dargestellten Fahrzeuges mit dem in Figur 1 dargestellten Radnabenantrieb 1 versehen werden. Der Reifen 18 dreht um die Drehachse 8. Der Rotor 4 ist drehmoment¬ schlüssig mit einem Lochkreis 6 der Felge 16 verbunden, wobei der Lochkreis 6 und die Felge 16 koaxial zur Drehachse 8 an¬ geordnet sind . Der Lochkreis 6 steht wiederum drehmomentschlüssig über nicht gezeigte Felgenbolzen mit der Felge 16 in Verbindung, wobei die Felge 16 den Reifen 18 antreibt. Zur Vermeidung von Rim 16 is located. For clarity, only one wheel with a tire 18 is shown. In general, all Rä ¬ of a vehicle, not shown, can be provided with the illustrated in Figure 1 wheel hub drive. 1 The tire 18 rotates about the axis of rotation 8. The rotor 4 is torque ¬ conclusively connected to a bolt circle 6 of the rim 16, wherein the bolt circle 6 and the rim 16 are arranged coaxially to the axis of rotation 8 ¬ . The bolt circle 6 is in turn torque-connected via rim bolts (not shown) to the rim 16, the rim 16 driving the tire 18. To avoid
Schmutz und/oder Wasser weist das Gehäuse 14 zusätzlich wenigstens einen Gehäusedeckel 26 auf. Der Rotor 4 und der Lochkreis 6 sind durch ein Drehlager 20 abgestützt. Dirt and / or water, the housing 14 additionally has at least one housing cover 26. The rotor 4 and the bolt circle 6 are supported by a pivot bearing 20.
An axialen Planflächen 12 des Rotors 4 ist jeweils eine Ringstruktur 10 angeordnet. Um Bauraum einzusparen ist es von Vorteil Luftspalte, beispielsweise zwischen Rotor 4 und At axial plane surfaces 12 of the rotor 4, a ring structure 10 is arranged in each case. To save space, it is advantageous air gaps, for example between rotor 4 and
Stator 2 und/oder zwischen Rotor 4 und Gehäuse 14, so klein wie möglich zu halten. Dadurch kann aber eine Berührung von Bauteilen, beispielsweise von Rotor 4 und Gehäuse 14, nur schwer während einer Belastung vermieden werden. Zur Verminderung der Schadhaftigkeit einer solchen Berührung ist erfin- dungsgemäß die Ringstruktur 10 vorgesehen. Stator 2 and / or between rotor 4 and housing 14 to keep as small as possible. As a result, however, contact between components, for example rotor 4 and housing 14, can only be avoided with difficulty during a load. To reduce the defectiveness of such a contact, the ring structure 10 is provided according to the invention.
Figur 2 zeigt eine Berührung 22, 24 der Ringstruktur 10 mit dem Gehäuse 14 oder dem Gehäusedeckel 26. Tritt unter einer Belastung des Radnabenantriebs, beispielsweise durch Vibrati- onen, eine Verkippung des Rotors 4 auf, so berühren sichFigure 2 shows a contact 22, 24 of the ring structure 10 with the housing 14 or the housing cover 26. Occurs under a load of the wheel hub drive, for example, by vibrations on a tilting of the rotor 4, so touch
Ringstruktur 10 und Gehäuse 14 oder Gehäusedeckel 26 an den Berührungspunkten 22, 24. Aufgrund der besonders guten Gleiteigenschaften der Ringstruktur 10 wird der Schaden an den Be- rührungspunkten 22, 24 möglichst gering gehalten. Insbesondere ist der Rotor 4 während einer Kippbeanspruchung nicht in direkten Kontakt mit dem Gehäuse 14 oder dem Gehäusedeckel 26. Hauptsächlich die Ringstruktur 10 wird durch die Rei- bungskräfte beansprucht. Die Ringstruktur 10 weist jedoch er¬ findungsgemäß gegenüber dem Rotor 4 einen geringeren, insbesondere einen wesentlich geringeren Gleitreibungskoeffizienten auf. Dadurch werden vorteilhafterweise Schäden am Rotor 4 oder sonstigen Bauteilen während einer Kippbeanspruchung ver- mieden. Die Ringstruktur 10 bildet somit eine Notlauf orrichtung aus . Ring structure 10 and housing 14 or housing cover 26 at the contact points 22, 24. Due to the particularly good sliding properties of the ring structure 10, the damage to the Be Reaching points 22, 24 kept as low as possible. In particular, the rotor 4 is not in direct contact with the housing 14 or the housing cover 26 during a tilting stress. The ring structure 10 is mainly stressed by the friction forces. However, the ring structure 10, he ¬ inventively compared to the rotor 4 on a smaller, in particular a much lower sliding friction on. As a result, damage to the rotor 4 or other components during a tilting load is advantageously avoided. The ring structure 10 thus forms a Notlauf orrichtung.
Figur 3 zeigt eine schematische Darstellung der Ringstruktur 10. Hierbei weist die Ringstruktur 10 einen inneren Durchmes- ser 28 und einen äußeren Durchmesser 30 auf. Vorteilhafterweise ist die betragsmäßige Differenz von innerem und äußerem Durchmesser 28, 30 kleiner gleich 10 mm. FIG. 3 shows a schematic representation of the ring structure 10. Here, the ring structure 10 has an inner diameter 28 and an outer diameter 30. Advantageously, the difference in magnitude of the inner and outer diameters 28, 30 is less than or equal to 10 mm.
Vorteilhafterweise weist die als dünne Scheibe 10 ausgebilde- te Ringstruktur 10 eine Mehrzahl von Senknuten 34 auf, die regelmäßig über eine Oberfläche 32 der Ringstruktur 10 ver¬ teilt sind. Die Senknuten 34 ermöglichen ein form- und/oder kraftschlüssiges Anbringen der Ringstruktur 10 an dem Rotor 4 mittels Senkkopfschrauben . Zusätzlich ist vorgesehen die Oberfläche 32 der Ringstruktur 10 mit einem Material zu be¬ schichten, dass einen geringeren Gleitreibungskoeffizienten aufweist als die Ringstruktur 10. Die Ringstruktur 10 kann vorteilhafterweise im Spritzgussverfahren mit geringem technischen Aufwand kostengünstig hergestellt werden. Advantageously, the ausgebilde- 10 has as a thin disc 10 te ring structure has a plurality of Senknuten 34 which are regularly over a surface 32 of the ring structure 10 divides ¬ ver. The Senknuten 34 allow a positive and / or non-positive attachment of the ring structure 10 to the rotor 4 by means of countersunk screws. In addition, 10 is provided with a material to be ¬ layers that a lower coefficient of sliding friction than said ring structure 10. The ring structure 10 can be advantageously manufactured at low cost by injection molding with little technical effort, the surface 32 of the ring structure.

Claims

Patentansprüche claims
1. Radnabenantrieb (1) umfassend einen Elektromotor, wobei der Elektromotor einen Stator (2) und einen hülsenförmigen Rotor (4) umfasst, wobei wenigstens an einer den Rotor (4) in axialer Richtung begrenzenden Planfläche (12) eine koaxial mit dem Rotor (4) ausgerichtete Ringstruktur (10) angeordnet ist, 1. wheel hub drive (1) comprising an electric motor, wherein the electric motor comprises a stator (2) and a sleeve-shaped rotor (4), wherein at least one of the rotor (4) in the axial direction limiting flat surface (12) coaxial with the rotor ( 4) aligned ring structure (10) is arranged,
dadurch gekennzeichnet, dass characterized in that
die Ringstruktur (10) einen kleineren Gleitreibungskoeffi¬ zienten aufweist als die eine begrenzende Planfläche (12) des Rotors (4) . the ring structure (10) has a smaller Gleitreibungskoeffi ¬ coefficient than a limiting plane surface (12) of the rotor (4).
2. Radnabenantrieb (1) gemäß Anspruch 1, dadurch gekennzeich- net, dass die Ringstruktur (10) form- und/oder kraftschlüssig mit dem Rotor (4) verbunden ist. Second wheel hub drive (1) according to claim 1, characterized marked, that the ring structure (10) positively and / or non-positively connected to the rotor (4).
3. Radnabenantrieb (1) gemäß Anspruch 2, dadurch gekennzeichnet, dass die Ringstruktur (10) mittels Schraubverbindungen mit dem Rotor (4) verbunden ist, wobei wenigstens ein Teilbe¬ reich der Ringstruktur (10) einen axialen Überstand bezüglich der Schraubverbindungen aufweist. 3. wheel hub drive (1) according to claim 2, characterized in that the ring structure (10) is connected by means of screw to the rotor (4), wherein at least a Teilbe ¬ rich of the ring structure (10) has an axial projection with respect to the screw.
4. Radnabenantrieb (1) gemäß Anspruch 2, dadurch gekennzeich- net, dass die Ringstruktur (10) mittels Klippverbindungen mit dem Rotor (4) verbunden ist. 4. wheel hub drive (1) according to claim 2, marked thereby, that the ring structure (10) by means of clip connections to the rotor (4) is connected.
5. Radnabenantrieb (1) gemäß einem der vorangegangen Ansprü¬ che, dadurch gekennzeichnet, dass die Ringstruktur (10) das Material Teflon umfasst. 5. wheel hub drive (1) according to one of the preceding Ansprü ¬ che, characterized in that the ring structure (10) comprises the material Teflon.
6. Radnabenantrieb (1) gemäß einem der vorangegangen Ansprü¬ che, dadurch gekennzeichnet, dass der Gleitreibungskoeffi¬ zient der Ringstruktur (10) bezogen auf ein Gehäuse (14) kleiner gleich 0,04 ist. 6. wheel hub drive (1) according to one of the preceding Ansprü ¬ che, characterized in that the Gleitreibungsko ¬ coefficient of the ring structure (10) relative to a housing (14) is less than or equal to 0.04.
7. Radnabenantrieb (1) gemäß einem der vorangegangen Ansprü¬ che, dadurch gekennzeichnet, dass ein innerer und äußerer Durchmesser (28, 30) der Ringstruktur (10) eine betragsmäßige Differenz von höchstens 10 mm aufweist. 7. wheel hub drive (1) according to one of the preceding Ansprü ¬ che, characterized in that an inner and outer Diameter (28, 30) of the ring structure (10) has a magnitude difference of at most 10 mm.
8. Radnabenantrieb (1) gemäß einem der vorangegangen Ansprü- che, dadurch gekennzeichnet, dass die Ringstruktur (10) eine Beschichtung (32) aufweist, wobei ein Gleitreibungskoeffi¬ zient der Beschichtung (32) geringer ist als der Gleitreibungskoeffizient der Ringstruktur (10). 8. wheel hub drive (1) according to one of the preceding claims, characterized in that the ring structure (10) has a coating (32), wherein a Gleitreibungsko ¬ coefficient of the coating (32) is less than the sliding friction coefficient of the ring structure (10) ,
EP14793478.0A 2013-10-31 2014-10-23 Wheel hub drive Withdrawn EP3053254A1 (en)

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DE201310222229 DE102013222229A1 (en) 2013-10-31 2013-10-31 wheel hub drive
PCT/EP2014/072715 WO2015062957A1 (en) 2013-10-31 2014-10-23 Wheel hub drive

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JP2016539620A (en) 2016-12-15
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DE102013222229A1 (en) 2015-04-30
US20160301280A1 (en) 2016-10-13

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