CVT SYSTEM


  1. CONSTRUCTION


    1. Forward/Reverse Switching Unit


      1. The forward/reverse switching unit consists of a planetary gear, a forward clutch, and a reverse brake.

      2. The forward clutch, which acts during a forward movement, connects the input shaft with the planetary carrier.

      3. The reverse brake, which acts during reverse movement, keeps the ring gear stationary.

        A00XRC0C03
        *1 Reverse Brake *2 Ring Gear
        *3 No. 1 Pinion Gear *4 Sun Gear
        *5 No. 2 Pinion Gear *6 Planetary Carrier
        *7 Forward Clutch *8 Forward/Reverse Switching Unit

    2. Pulley and Steel Belt Unit


      1. The widths of the grooves of the pulleys are changed through hydraulic control.

      2. During acceleration, the action of shift solenoid valve DS1 increases the fluid inflow volume to the primary pulley, thus narrowing the width of the pulley groove.

      3. During deceleration, the action of shift solenoid valve DS2 increases the fluid outflow volume to the primary pulley, thus widening the width of the pulley groove.

      4. The secondary pulley is hydraulically controlled by shift solenoid valve SLS. It controls the belt clamping pressure to ensure the proper power transmission efficiency.

        A00XRUWC03
        *1 Secondary Pulley *2 Primary Pulley
        *3 Steel Belt - -
        *a Groove Width (Large) *b Groove Width (Small)
        *c Pulley Ratio (Low) *d Pulley Ratio (High)

      5. The primary pulley uses a single piston construction.

        A00XRQZC01
        *1 Chamber - -
        *a Pulley Ratio (Low) *b Pulley Ratio (High)

      6. The steel belt consists of elements and 2 rows of steel rings. In contrast to the chains and V-belt that transmit power through the use of tensile force, the steel belt uses the compressive action (pushing force) of the elements to transmit power.

        A00XRSZC01
        *1 Steel Ring *2 Element

    3. Reduction Gear and Differential


      1. The reduction gear reduces the power output from the secondary pulley and transmits it to the differential.

      2. A 2-pinion type differential is used.

        A00XRLBC01
        *1 Reduction Drive Gear *2 Reduction Driven Gear
        *3 Front Differential - -

  2. OPERATION


    1. Forward/Reverse Switching Unit


      1. The forward clutch is connected when advancing, and engine torque is input from the input shaft to the planetary carrier and is output to the primary pulley.

        A00XRMMC01
        *1 Reverse Brake *2 Ring Gear
        *3 No. 1 Pinion Gear *4 Sun Gear
        *5 Forward Clutch *6 No. 2 Pinion Gear
        *a Input *b Output

      2. Engine torque is input to the sun gear when reversing. The ring gear is fixed by the reverse brake to transmit engine torque to the stepless shift transmission mechanism with inverse rotation.

        A00XR8UC01
        *1 Reverse Brake *2 Ring Gear
        *3 No. 1 Pinion Gear *4 Sun Gear
        *5 Forward Clutch *6 No. 2 Pinion Gear
        *a Input *b Output

    2. Transaxle Power Flow


      1. The changing of the pulley ratio is accomplished in a continuously variable manner by varying the widths of the grooves of the primary and secondary pulleys.

        A00XRHTC02
        *1 Primary Pulley *2 Secondary Pulley
        *3 Differential Ring Gear *4 Reduction Driven Gear
        *5 Reduction Drive Gear *6 Input Shaft
        *7 Forward Clutch *8 Reverse Brake

      2. Shift Lever in D (Pulley Ratio Low)

        A00XRGNC02
        *1 Primary Pulley *2 Secondary Pulley
        *3 Input Shaft *4 Forward Clutch (On)
        *5 Reverse Brake (Off) - -
        *a Groove Width (Large) *b Groove Width (Small)

      3. Shift Lever in D (Pulley Ratio High)

        A00XRRYC01
        *1 Primary Pulley *2 Secondary Pulley
        *3 Input Shaft *4 Forward Clutch (On)
        *5 Reverse Brake (Off) - -
        *a Groove Width (Small) *b Groove Width (Large)

      4. Shift Lever in N

        A00XRPQC01
        *1 Primary Pulley *2 Secondary Pulley
        *3 Input Shaft *4 Forward Clutch (Off)
        *5 Reverse Brake (Off) - -
        *a Groove Width (Large) *b Groove Width (Small)

      5. Shift Lever in R

        A00XRJ7C01
        *1 Primary Pulley *2 Secondary Pulley
        *3 Input Shaft *4 Forward Clutch (Off)
        *5 Reverse Brake (On) - -
        *a Groove Width (Large) *b Groove Width (Small)

      6. Shift Lever in M


        • Gear train movement when the shift lever is in M is similar to the one when the shift lever is in D. However, pulley ratio is adjusted in accordance with driver's shift operation, the driver is able to upshift or downshift with a manual-like feel.