A750F AUTOMATIC TRANSMISSION


  1. CONSTRUCTION


    1. The planetary gear unit consists of three planetary gear units, three clutches, four brakes, and three one-way clutches.


      1. A centrifugal fluid pressure canceling mechanism is used in the C1, C2, and C3 clutches that are applied when shifting from 2nd → 3rd, 3rd → 4th, and 4th → 5th

        A01W6GIC01
        *1 Input Shaft *2 Intermediate Shaft
        *3 Sun Gear *4 Front Planetary Gear
        *5 Center Planetary Gear *6 Rear Planetary Gear
        *7 Output Shaft - -

  2. FUNCTION OF COMPONENTS

    Component Function
    C1 No. 1 Clutch Connects the input shaft and intermediate shaft.
    C2 No. 2 Clutch Connects the input shaft and center planetary carrier.
    C3 No. 3 Clutch Connects the input shaft and front sun gear.
    B1 No. 1 Brake Prevents the front planetary carrier from turning either clockwise or counterclockwise.
    B2 No. 2 Brake Prevents the front and center ring gear from turning either clockwise or counterclockwise.
    B3 No. 3 Brake Prevents the outer race of F2 from turning either clockwise or counterclockwise.
    B4 No. 4 Brake Prevents the center planetary carrier and rear ring gear from turning either clockwise or counterclockwise.
    F1 No. 1 One-way Clutch Prevents the front planetary carrier from turning counterclockwise.
    F2 No. 2 One-way Clutch When B3 is operating, this one-way clutch prevents the front planetary sun gear from turning counterclockwise.
    F3 No. 3 One-way Clutch Prevents the center planetary carrier and rear ring gear from turning counterclockwise.
    Planetary Gears These gears change the route through which driving force is transmitted, in accordance with the operation of each clutch and brake, in order to increase or reduce the input and output speed.

  3. TRANSMISSION POWER FLOW

    Shift Lever Position Solenoid Valve
    S1 S2
    P On -
    R* On -
    N On -
    D, S5 1st On -
    2nd On On
    3rd - On
    4th* - -
    5th* - -
    S4 1st On -
    2nd On On
    3rd - On
    4th* - -
    S3 1st On -
    2nd On On
    3rd* - On
    S2 1st On -
    2nd* On On
    S1 1st* On -

    *: with engine brake

    Shift Lever Position Solenoid Valve
    SR SL1 SL2 SLU
    P - - On -
    R* - - On -
    N - - On -
    D, S5 1st - - On -
    2nd - - On -
    3rd - - On -
    4th* - - On -
    5th* On On - On
    S4 1st - - On -
    2nd - - On -
    3rd - - On -
    4th* - - On On
    S3 1st - - On -
    2nd - - On -
    3rd* - - - -
    S2 1st - - On -
    2nd* On - - -
    S1 1st* - - - -

    *: Engine braking occurs

    Shift Lever Position Clutch
    C1 C2 C3
    P - - -
    R* - - ○
    N - - -
    D, S5 1st ○ - -
    2nd ○ - -
    3rd ○ - ○
    4th* ○ ○ ●
    5th* - ○ ○
    S4 1st ○ - -
    2nd ○ - -
    3rd ○ - ○
    4th* ○ ○ ●
    S3 1st ○ - -
    2nd ○ - -
    3rd* ○ - ○
    S2 1st ○ - -
    2nd* ○ - -
    S1 1st* ○ - -

    ○: Operates

    ●: Operates but is not related to power transmission

    *: Engine braking occurs

    Shift Lever Position Brake
    B1 B2 B3 B4
    P - - - -
    R* ▲ - - ○
    N - - - -
    D, S5 1st - - - -
    2nd - - ○ -
    3rd - - ● -
    4th* - - ● -
    5th* ○ - ● -
    S4 1st - - - -
    2nd - - ○ -
    3rd - - ● -
    4th* - - ● -
    S3 1st - - - -
    2nd - - ○ -
    3rd* ▲ - ● -
    S2 1st - - - -
    2nd* - ▲ ○ -
    S1 1st* - - - ▲

    ○: Operates

    ●: Operates but is not related to power transmission

    ▲: Operates during engine braking

    *: Engine braking occurs

    Shift Lever Position One-way Clutch
    F1 F2 F3
    P - - -
    R* ○ - -
    N - - -
    S5 1st - - ○
    2nd ○ ○ -
    3rd ○ - -
    4th* - - -
    5th* - - -
    S4 1st - - ○
    2nd ○ ○ -
    3rd ○ - -
    4th* - - -
    S3 1st - - ○
    2nd ○ ○ -
    3rd* ○ - -
    S2 1st - - ○
    2nd* ○ ○ -
    S1 1st* - - ○

    ○: Operates

    *: Engine braking occurs


    1. 1st Gear (D Position or S Mode)

      A01W6JAE01
      *1 Operates
      *2 Operates only in the S1 range

    2. 2nd Gear (D Position or S Mode)

      A01W6CEE01
      *1 Operates
      *2 Operates only in the S2 range

    3. 3rd Gear (D Position or S Mode)

      A01W6A4E01
      *1 Operates
      *2 Operates only in the S3 range
      *3 Operates but is not related to power transmission

    4. 4th Gear (D Position or S Mode)

      A01W6H0E01
      *1 Operates
      *2 Operates but is not related to power transmission

    5. 5th Gear (D Position or S Mode)

      A01W6L0E01
      *1 Operates
      *2 Operates but is not related to power transmission

    6. Reverse Gear (R Position)

      A01W65LE01
      *1 Operates
      *2 Operates during engine braking

  4. CENTRIFUGAL FLUID PRESSURE CANCELING MECHANISM


    1. For the following reason, the centrifugal fluid pressure canceling mechanism is used on the C1, C2, and C3 clutches.


      1. Clutch shifting operation is affected not only by the valve body controlling fluid pressure but also by centrifugal fluid pressure that is present due to fluid in the clutch piston oil pressure chamber. The centrifugal fluid pressure canceling mechanism has chamber B to reduce this affect applied to the chamber A. As a result, smooth shifting with excellent response has been achieved.

        A01W69DC01
        *1 Piston *2 Chamber A
        *3 Chamber B *4 C1 Clutch
        *5 C2 Clutch *6 C3 Clutch
        A01W6IHE20