DYNAMIC TORQUE CONTROL AWD SYSTEM

Info Added 2017-04-18


  1. CONSTRUCTION


    1. The transmission coupling assembly consists of a front housing, main clutch, 4 WD linear solenoid, armature, control clutch, cam, piston and shaft.

    2. The outer sides of the main clutch and control clutch are coupled with the front housing. The inner side of the main clutch is coupled with the shaft, and the inner side of the control clutch is coupled with the cam.

    3. The control clutch is a multiple metal plate type, and the main clutch is a multiple wet plate type.

      Tech Tips

      The transmission coupling assembly cannot be disassembled. Replace the transmission coupling assembly as a unit when performing replacement. For details, refer to the Repair Manual.

      A001MTUC04
      *1 Front Housing *2 Shaft
      *3 Piston *4 Armature
      *5 Cam *6 4WD Linear Solenoid
      *7 Control Clutch *8 Main Clutch
      B003XF2 Propeller Shaft Side - -

  2. OPERATION


    1. Not Operating


      1. The drive force is transmitted from the propeller shaft to the front housing. When the 4WD linear solenoid is not operating, the drive force of the front housing is not transmitted to the shaft because the control clutch is not engaged. Accordingly, the drive force of the propeller shaft is not transmitted to the rear wheels.

        A001MHEC01
        *1 Front Housing *2 Shaft
        *3 Piston *4 Cam
        *5 4WD ECU Assembly *6 4WD Linear Solenoid
        *7 Control Clutch *8 Armature
        *9 Main Clutch - -

    2. Operating


      1. When the 4WD ECU assembly energizes the 4WD linear solenoid, it attracts the armature to the control clutch side. This causes the control clutch to engage and the cam to rotate.

      2. The rotational movement of the cam causes the piston to push on the main clutch, causing the main clutch to engage. Accordingly, the drive force of the propeller shaft is transmitted to the rear wheels.

        A001N00C01
        *1 Front Housing *2 Shaft
        *3 Piston *4 Cam
        *5 4WD ECU Assembly *6 4WD Linear Solenoid
        *7 Control Clutch *8 Armature
        *9 Main Clutch - -
        *a High Amperage *b Low Amperage

      3. The amount of drive force that is transmitted to the rear wheels is controlled steplessly by controlling the amperage that is applied to the 4WD linear solenoid.

        Figure 1. Low Amperage

        A001N35C01
        *1 4WD ECU Assembly - -
        *a Control Clutch Engagement Force: Small *b Piston Travel Distance

        Figure 2. High Amperage

        A001MIOC01
        *1 4WD ECU Assembly - -
        *a Control Clutch Engagement Force: Large *b Piston Travel Distance
        *c Main Clutch Engagement Force: Large - -