CVT SYSTEM GENERAL


  1. OUTLINE


    1. A newly developed K41B Continuously Variable Transaxle (CVT) is used for the1NR-FE engine models.

    2. The K41B CVT, including a pair of the pulleys and the belt in the shift mechanism, is a transaxle which steplessly shifts from start-up to the maximum speed and this offers a smooth shift feeling and an excellent fuel economy.

    3. A gate type shift lever is used for the shift control mechanism.

    4. A 7-speed sport sequential shiftmatic system is available as an option.

    5. A shift lock system is used to prevent the shift lever from being wrongly operated.

  2. SPECIFICATION

    Continuously Variable Transaxle
    Item Specification
    Shift Mechanism Pulley and Belt
    Forward/Reverse Switching Mechanism Double Pinion Type Planetary Gear
    Pulley Ratio (Speed Ratio) Forward 2.386 to 0.426
    Reverse (Planetary gear ratio included) 2.505
    Differential Gear Ratio (Reduction gear ratio included) 5.403
    Shift Pattern P - R - N - D - S - B
    P - R - N - D - M (with 7-speed sport sequential shiftmatic system)
    Fluid Capacity 6.37 Liters (6.73 US qts, 5.61 Imp. qts)
    Fluid Type Toyota Genuine CVT Fluid TC
    Weight (Reference)* 60.9 kg (134.3 lb)

    Tech Tips

    *: Weight shows the figure with the fluid fully filled.

    Gears and Friction Discs
    Item Specification
    Planetary Gear Sun Gear No. of Teeth 40
    No. 1 Pinion Gear No. of Teeth 18
    No. 2 Pinion Gear No. of Teeth 17
    Ring Gear No. of Teeth 82
    Forward Clutch No. of Discs 2
    Reverse Brake No. of Discs 3
    Reduction Gear Drive Gear No. of Teeth 27
    Driven Gear No. of Teeth 40
    Differential Gear Drive Pinion No. of Teeth 17
    Ring Gear No. of Teeth 62
    No. of Differential Pinion 2
    Torque Converter
    Item Specification
    Torque Converter Type 3-element, 1-step, 2-phase
    Stall Torque Ratio 1.85

  3. MAIN FEATURES


    1. The K41B CVT has achieved the following performance through the use of the items listed below.

      Item Fuel Economy Power Efficiency Driveability Quietness Compact and Lightweight
      Pulley and Belt Type Shift Mechanism ○ ○ ○ ○ ○
      Double Pinion Type Forward/Reverse Switching Mechanism ○ ○ ○
      Torque Converter with Low Speed Lock-up Clutch ○ ○ ○ ○ ○
      High-pressure Oil Pump ○ ○ ○ ○
      CVT Fluid Warmer ○
      High-pressure Hydraulic Control Circuit (Valve Body Unit) ○ ○ ○
      Electronic Control System Speed Ratio Control (Shift Control) ○ ○ ○
      Belt Clamping Force Control ○ ○ ○
      Engine - CVT Integrated Control ○ ○ ○
      Pulley Ratio Control Automatic Shift Control ○ ○ ○
      Acceleration Improvement Control ○ ○
      7-speed Sport Sequential Shiftmatic ○ ○
      Uphill/Downhill Shift Control ○
      Lock-up Control ○ ○
      Neutral Control ○