DRIVING APPARATUS FOR REAR WHEEL OF ENVIRONMENT-FRIENDLY VEHICLE

• US 20170182884A1
• Filed: 12/12/2016
• Published: 06/29/2017
• Est. Priority Date: 12/24/2015
• Status: Active Grant

• Current Assignee: Hyundai Dymos Inc. (Hyundai Mobis Co., Ltd.)
• Original Assignee: Hyundai Dymos Inc. (Hyundai Mobis Co., Ltd.)
• Inventors: KIM, GEUN HO, JEONG, HEE CHEON, LEE, SANG KI
• Granted Patent: US 10,059,199 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 17/046 with planetary gearing having orbital motion
• CPC Class Codes: B60K 17/165 provided between independent half axles B60K17/18, B60K17/20 take precedence
• CPC Class Codes: B60K 17/356 having fluid or electric motor, for driving one or more wheels disposition of motor in, or adjacent to, traction wheel B60K7/00
• CPC Class Codes: B60K 2006/381 characterized by driveline brakes shift brakes in transmission B60K6/54
• CPC Class Codes: B60K 2006/4833 Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range
• CPC Class Codes: B60K 2007/0092 the motor axle being coaxial to the wheel axle
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/52 Driving a plurality of drive axles, e.g. four-wheel drive
• CPC Class Codes: B60K 7/0007 the motor being electric
• CPC Class Codes: B60L 15/2036 Electric differentials, e.g. for supporting steering vehicles
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2220/42 with use of more than one motor
• CPC Class Codes: B60L 2240/22 Yaw angle
• CPC Class Codes: B60L 2240/42 related to electric machines
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2260/28 Four wheel or all wheel drive
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 7/18 : Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: B60L 7/26 : Controlling the braking effect
• CPC Class Codes: B60W 20/15 : Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2720/406 : between left and right wheel
• CPC Class Codes: B60W 30/00 : Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
• CPC Class Codes: B60W 30/045 : Improving turning performance
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: B60Y 2300/60 : Control of electric machines, e.g. problems related to electric motors or generators
• CPC Class Codes: B60Y 2300/70 : Control of gearings
• CPC Class Codes: B60Y 2400/73 : Planetary gearings
• CPC Class Codes: F16H 3/72 : with a secondary drive, e.g. regulating motor, in order to vary speed continuously
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/916 : with plurality of drive axles
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

Disclosed herein is a rear-wheel drive apparatus of an eco-friendly vehicle, which is capable of improving the longitudinal driving force and handling performance of a vehicle by independently driving both rear wheels of the vehicle using a plurality of drive motors.

Claims

1. A rear-wheel drive apparatus of an eco-friendly vehicle for independently driving first and second rear wheels of a vehicle, comprising:

a rear-wheel drive device comprising a first motor for driving the first rear wheel and a second motor for driving the second rear wheel;

a rear-wheel reduction device reducing driving forces of the first and second motors to respectively transfer the driving forces to the first and second rear wheels; and

a controller for controlling the rear-wheel drive device and the rear-wheel reduction device so as to independently drive the first and second motors.

2. The rear-wheel drive apparatus according to claim 1, wherein the rear-wheel reduction device comprises:

a first planetary gear set disposed between an output shaft of the first motor and the first rear wheel; and

a second planetary gear set disposed between an output shaft of the second motor and the second rear wheel.

3. The rear-wheel drive apparatus according to claim 2, wherein:

the first planetary gear set comprises a first carrier connected to the output shaft of the first motor, a first sun gear connected to the first rear wheel, and a first ring gear detachably fixed to a vehicle body; and

the second planetary gear set comprises a second carrier connected to the output shaft of the second motor, a second sun gear connected to the second rear wheel, and a second ring gear detachably fixed to the vehicle body.

4. The rear-wheel drive apparatus according to claim 3, wherein:

the rear-wheel reduction device further comprises a first brake for detachably fixing the first ring gear to the vehicle body while being hydraulically operated, and a second brake for detachably fixing the second ring gear to the vehicle body while being hydraulically operated; and

when a hydraulic pressure is not supplied to the first and second brakes, the first and second ring gears are fixed by the first and second brakes.

5. The rear-wheel drive apparatus according to claim 4, wherein:

the rear-wheel reduction device further comprises a clutch for detachably interconnecting the first and second ring gears while being hydraulically operated; and

when a hydraulic pressure is not supplied to the clutch, the clutch is in a lock-off state so that the first and second ring gears are disconnected from each other.

6. The rear-wheel drive apparatus according to claim 5, wherein the controller comprises:

a motor control unit operated to independently supply driving power to the first and second motors;

a hydraulic control device operated to generate a hydraulic pressure and supply the hydraulic pressure to the first and second brakes and the clutch; and

a vehicle control unit electrically connected to the motor control unit and the hydraulic control device so as to control operation of the motor control unit and the hydraulic control device.

7. The rear-wheel drive apparatus according to claim 6, wherein when electric power is supplied to at least one of the first and second motors by the motor control unit, the vehicle control unit controls the first and second brakes and the clutch such that the hydraulic pressure is not supplied thereto through the hydraulic control device.

8. The rear-wheel drive apparatus according to claim 6, wherein when electric power supplied to the first and second motors is interrupted by the motor control unit, the vehicle control unit changes the first and second brakes from a lock-on state to a lock-off state and changes the clutch from a lock-off state to a lock-on state through the hydraulic control device.

9. The rear-wheel drive apparatus according to claim 7, further comprising a battery for storing electric power supplied to the first and second motors,

wherein when electric power is supplied to at least one of the first and second motors, the motor control unit recovers electric power generated by the other motor, which is not supplied with electric power, so as to allow the generated electric power to be stored in the battery.