HYBRID TRANSAXLE SYSTEM


  1. CONSTRUCTION


    1. The power output of the engine, which is transmitted via the planetary gear unit, is divided into the motive force directed to the drive wheels and the motive force to the generator (MG1) for generating electricity. Also, when generator (MG1) rotates and the engine starts, generator (MG1) functions as a starter.

    2. As part of the power split planetary gear unit, the sun gear is connected to generator (MG1), the ring gear is connected to the counter drive gear (output) and the carrier is connected to the engine.

    3. A compound gear integrated with the 3 gear functions of the ring gear of the power split planetary gear, counter drive gear and parking lock gear is used. Optimization of the heat treatment and machining process ensures high precision which has achieved a compact gear train and reduced noise.

      A003IUKC01
      *1 Power Split Planetary Gear Unit *2 Counter Drive Gear (Compound Gear)
      *3 Planetary Ring Gear *4 Parking Lock Gear

    4. When the motors are operated at maximum output when the vehicle is driven by motor, the one-way clutch helps to prevent the engine from rotating in the opposite direction, and the torque of the generator (MG1) is transmitted to the output shaft so that the generator (MG1) can function as a motor.

    5. Mechanical Structure of One-way Clutch


      1. When the generator (MG1) starts to rotate in the opposite direction to that of the engine, the pawl engages with the notch of the one-way clutch lock plate to lock the generator (MG1).

      2. When the generator (MG1) rotates in the same direction as the engine, the pawl passes over the notch and the generator (MG1) can spin freely without locking.

      3. As the speed of the generator in the same direction as the engine increases, the centrifugal force becomes higher than the spring force and the pawls no longer fall into the notches, decreasing output losses.

        A003IPUC01
        *1 Flywheel Sub-assembly *2 One-way Clutch Assembly
        *3 One-way Clutch Holding Plate *4 Pawl
        *5 Spring *6 Outer Race (Revolving Gear)
        *7 Inner Race (Fixed Gear) - -
        *a Engine Counter-rotation Direction (Locked) *b Engine Rotation Direction (Rotates Freely)
        *c Notch - -