CX-3の小型･軽量4WDシステムの紹介 ... - mazda.com

1 38 1 4 Drivetrain Development Dept. 2015 CX-3 4WD Introduction of 4WD Technology for New DEMIO and CX-3 1 2 3 Tomoo Sawazaki Yasushi Yagi Kazuyuki Ishida 4 Tetsushi Marutani Zoom-Zoom CX-5 4WD SKYACTIV TECHNOLOGY 4WD 4WD CX-3 4WD Summary

2 mazda aims to build environmentally friendly and fun-to-drive vehicles based on the long-term vision, Sustainable Zoom-Zoom concept. With the slogan of You can feel unity with the car on any roads , mazda s signature, fun-to-drive 4WD was newly developed for CX-5 with superior drivability, handling stability and fuel economy in combination with SKYACTIV technologies. This paper introduces development spirit and performance of the new generation 4WD that achieves further weight reduction for the compact models, the all-new DEMIO and CX-3. 1. CX-5 4WD , 4WD 1 SKYACTIV TECHNOLOGY 2 4WD 4WD CX-3 4WD 2.

3 4WD 4WD 2 1 2 4WD Fig. 1 Breakthrough of 4WD Performance and Fuel Economy Alternative 4WD Performance(Driving Performance Handling Stability)Fuel Economy4 WDSwitch on4 WDSwitchoffDEMIOCX-5 AXELAB reak through 39 2015 3. 4WD 4WD 4WD 4WD FF 0 Fig. 2 A Fig. 2 C Fig.

4 2 B 4WD 4WD Fig. 2 Minimum Point of Total Energy Loss 2 4WD 1 2 4. 4WD 4WD CX-3 CX-5 4WD Fig. 3 4WD Fig. 4 Fig.

5 5 Fig. 3 Schematic of 4WD System Fig. 4 Control Flow of 4WD System Front Tire Slip(Lack of Rear Torque)Total Energy Loss [kW]Mechanical Energy Loss RearTire LossFront Tire Loss1000 Rear Torque Distribution Ratio [% ]ACTarget PointExcessive Rear Torque(b) Energy Loss(Total)B (Energy Loss Minimum Point)Tire gripareaRear Torque Distribution Ratio [% ](a) Energy Loss<Moderate accelerationon snowy road>Energy Loss [kW]Front Tire LossRear Tire LossMechanical Efficiency LossUnit Spin Loss1000T ire SlipSum Totalof Each Loss 40 2015 4WD 4WD 4 1 4 Fig. 6 2 3 Fig.

6 7 4 Fig. 8 Fig. 7 Torque Distribution Fig. 8 Standby Torque 5. 4WD 4WD CX-3 Fig. 9 Fig. 5 4WD System Chart Front Tire -sCharacteristic on Snowy RoadTire Slip RatioDrivingForce [N]Dead BandGrip AreaDriver notices "Tire Slip"System detects imperceptible TorquePre-torqueBacklash of splineDiff. Mt. wind upCoupling differential angleTorsionalangle of rear drivelineImproved response bypre-torqueEnergy loss minimum point(B)Fig. 6 Tire Slip Ratio 41 2015 Fig. 9 Theory of Hardware Size Down PTO Fig.

7 10 CAE NVH CX-5 Fig. 10 11 Fig. 10 Ring Gear Size Fig. 11 Size Reduction Fig. 12 60km/h 27% Fig. 13 Fig. 12 Oil Kinematic Viscosity Fig. 13 Friction Torque Reduction 6. CX-5 4WD 4WD CX-3 CX-3 (1) 4WD 2012 020406080100kinematic viscosity [cSt]Temparature [ C]Kinematic viscosity vs. TemparaturePrevious OilNew OilB carSUVSub BcarNew DEMIORear DifferencialCX-5 PTOCX-5 RearDifferencialNew DEMIO Power Take OffBICV ehicle Weight x TiresizeRing Gear SizeRing Gear OuterDiameter [mm]