# US 2014/0152076 A1 · Wheel hub drive system

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- Number: US 2014/0152076 A1
- Document ID: US20140152076A1
- Status: Published application
- Kind: A1
- Application number: 14/235,977
- Filed: 2012-07-31
- Published: 2014-06-05
- Earliest claimed: 2011-08-24
- Assignees: Schaeffler Technologies AG & Co. KG
- Inventors: Tobias Vogler; Raphael Fischer; Mark Lauger; Dorothee Stirnweiss
- Web page: https://patentgrep.com/patent/US20140152076A1

## CPC

- B60K 7/0007: {the motor being electric}
- B60L 3/108: {whilst braking, i.e. ABS}
- B60L 7/14: for vehicles propelled by AC motors
- B60L 7/26: Controlling the braking effect
- B60L 15/007: {Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles}
- B60L 15/2009: {for braking}
- B60L 15/2036: {Electric differentials, e.g. for supporting steering vehicles}
- B60L 50/51: characterised by AC-motors
- F16D 49/00: Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like (similar clutches F16D13/10)
- F16D 55/00: Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes (similar clutches F16D13/38)
- H02K 7/006: {Structural association of a motor or generator with the drive train of a motor vehicle}
- H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06)
- H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence)
- B60K 2007/0038: {the motor moving together with the wheel axle}
- B60K 2007/0092: {the motor axle being coaxial to the wheel axle}
- B60L 2220/14: Synchronous machines
- B60L 2220/44: Wheel Hub motors, i.e. integrated in the wheel hub
- B60L 2240/423: Torque
- B60L 2270/147: electro magnetic [EMI]
- B60Y 2400/61: Arrangements of controllers for electric machines, e.g. inverters
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/72: Electric energy management in electromobility
- 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
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A wheel hub drive system with an electric motor that can be arranged inside a wheel rim, whereby the electric motor is formed by rotor that is at least indirectly joined to a wheel hub and by means of a stationary stator that can be supplied with alternating current. With an eye towards obtaining more space for the vehicle occupants, it is proposed to arrange the converter with its entire power electronics unit on the stator so that the wheel hub drive system can be operated with direct current from the battery of the vehicle, or else no alternating current lines have to be laid in the vehicle. Consequently, the alternating current is generated by the converter that is arranged in a converter housing attached axially next to the stator.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A wheel hub drive system comprising:
an electric motor arrangeable inside a wheel rim, the electric motor including a rotor at least indirectly joined to a wheel hub and a stationary stator supplyable with alternating current; and
a converter for generating the alternating current and arranged in a converter housing attached axially next to the stator.

### Claim 12 (depends on 11)

The system as recited in claim 11 wherein the stator is arranged axially between a front plate of the wheel rim and the converter housing.

### Claim 13 (depends on 11)

The system as recited in claim 11 wherein the converter housing is attached to the stator or to a first component, the first component being attached to the stator.

### Claim 14 (depends on 13)

The system as recited in claim 13 wherein the first component is a stator plate or a brake anchor plate.

### Claim 15 (depends on 11)

The system as recited in claim 11 wherein the converter housing is at least partially arranged radially inside the wheel rim.

### Claim 16 (depends on 11)

The system as recited in claim 11 further comprising contacts projecting out of the converter housing or out of a coil element of the stator and pluggable or screwable into the coil element of the stator or into the converter housing so as to establish electric contact.

### Claim 17 (depends on 16)

The system as recited in claim 16 wherein the contacts are designed in the form of pins and, when contacted during operation, the pins project through the stator plate or through the brake anchor plate.

### Claim 18 (depends on 11)

The system as recited in claim 11 wherein the converter housing is in contact with the coil element, with a cooling element of the stator, with the brake anchor plate, or with the stator plate.

### Claim 19 (depends on 14)

The system as recited in claim 14 wherein the brake anchor plate supports at least one brake component of a friction brake.

### Claim 20 (depends on 19)

The system as recited in claim 19 wherein the friction brake is a disc brake, an electronic wedge brake or a drum brake.

### Claim 21 (depends on 19)

The system as recited in claim 19 wherein the brake component of the friction brake is a brake cylinder or a brake caliper.