AUTOMATIC TRANSMISSION SYSTEM


  1. CONSTRUCTION


    • An 8-speed configuration has been achieved by using 2 planetary gear units, creating an 8-speed automatic transmission.

    • A Ravigneaux type gear unit is used as the rear planetary gear unit. The gear unit consists of pairs of sun gears (middle and rear) and planetary pinion gears (long and short) with different diameters within a single planetary gear.

    • The centrifugal fluid pressure canceling mechanism is used in the C1, C2, C3 and C4 clutches that are applied when shifting from 2nd to 3rd, from 3rd to 4th, from 4th to 5th, from 5th to 6th, from 6th to 7th and from 7th to 8th.

      B003SN5C01
      *1 No. 1 Brake (B1) *2 No. 4 Clutch (C4)
      *3 Front Planetary Ring Gear *4 Rear Planetary Gear Unit
      *5 No. 2 Clutch (C2) *6 No. 2 Brake (B2)
      *7 No. 1 1-way Clutch *8 No. 1 Clutch (C1)
      *9 No. 3 Clutch (C3) - -
      B003SMZC01
      *1 Input Shaft *2 Front Planetary Sun Gear
      *3 Front Planetary Ring Gear *4 Front Planetary Gear Unit
      *5 Intermediate Shaft *6 Rear Planetary Middle Sun Gear
      *7 Rear Planetary Ring Gear *8 Rear Planetary Gear Unit
      *9 Rear Planetary Rear Sun Gear *10 Output Shaft
      *11 Rear Planetary Short Pinion Gear *12 Rear Planetary Long Pinion Gear
      *13 Front Planetary Pinion Gear - -
      C1 No. 1 Clutch C2 No. 2 Clutch
      C3 No. 3 Clutch C4 No. 4 Clutch
      B1 No. 1 Brake B2 No. 2 Brake
      F1 No. 1 1-way Clutch - -

  2. OPERATION


    1. Transmission Power Flow

      Operating Condition of Shift Solenoid Valves (Models with 2GR-FKS Engine)
      Shift Position, Shift Range and Gear Range Shift Solenoid Valve
      SL1 SL2 SL3 SL4 SL5 SR SL SLU
      P ○ X X X X ○ X X
      R X X ○ X X ○ ○ X
      N ○ X X X X ○ X X
      D, D8 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      3rd ○ X ○ X X ○ X X
      4th ○ X X ○ X ○ ○ ●
      5th ○ ○ X X X ○ ○ ●
      6th X ○ X ○ X ○ ○ ●
      7th X ○ ○ X X ○ ○ ●
      8th X ○ X X ○ ○ ○ ●
      D7 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      3rd ○ X ○ X X ○ X X
      4th ○ X X ○ X ○ ○ X
      5th ○ ○ X X X ○ ○ ●
      6th X ○ X ○ X ○ ○ ●
      7th X ○ ○ X X ○ ○ ●
      D6 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      3rd ○ X ○ X X ○ X X
      4th ○ X X ○ X ○ ○ X
      5th ○ ○ X X X ○ ○ ●
      6th X ○ X ○ X ○ ○ ●
      D5 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      3rd ○ X ○ X X ○ X X
      4th ○ X X ○ X ○ ○ X
      5th ○ ○ X X X ○ ○ ●
      D4 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      3rd ○ X ○ X X ○ X X
      4th ○ X X ○ X ○ ○ X
      D3 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      3rd ○ X ○ X X ○ X X
      D2 1st ○ X X X X ○ X X
      2nd ○ X X X ○ ○ X X
      D1 1st ○ X X X X ○ X X
      M8 8th X ○ X X ○ ○ ○ ○
      M7 7th X ○ ○ X X ○ ○ ○
      M6 6th X ○ X ○ X ○ ○ ○
      M5 5th ○ ○ X X X ○ ○ ○
      M4 4th ○ X X ○ X ○ ○ ○
      M3 3rd ○ X ○ X X ○ ○ ○
      M2 2nd ○ X X X ○ ○ ○ ○
      M1 1st ○ X X X X ○ X X

      ○: On

      ●: In Accordance with Flex Lock-up

      X: Off

      Operating Condition of Shift Solenoid Valves (Models with 8AR-FTS Engine)
      Shift Position, Shift Range and Gear Range Shift Solenoid Valve
      SL1 SL2 SL3 SL4 SL5 SC1 SC2 SLU
      P X X X X X X X X
      R X X ○ X X X X X
      N X X X X X X X X
      D, D8 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      3rd ○ X ○ X X X ○ ●
      4th ○ X X ○ X X ○ ●
      5th ○ ○ X X X X ○ ●
      6th X ○ X ○ X X ○ ●
      7th X ○ ○ X X X ○ ●
      8th X ○ X X ○ X ○ ●
      D7 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      3rd ○ X ○ X X X ○ ●
      4th ○ X X ○ X X ○ ●
      5th ○ ○ X X X X ○ ●
      6th X ○ X ○ X X ○ ●
      7th X ○ ○ X X X ○ ●
      D6 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      3rd ○ X ○ X X X ○ ●
      4th ○ X X ○ X X ○ ●
      5th ○ ○ X X X X ○ ●
      6th X ○ X ○ X X ○ ●
      D5 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      3rd ○ X ○ X X X ○ ●
      4th ○ X X ○ X X ○ ●
      5th ○ ○ X X X X ○ ●
      D4 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      3rd ○ X ○ X X X ○ ●
      4th ○ X X ○ X X ○ ●
      D3 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      3rd ○ X ○ X X X ○ ●
      D2 1st ○ X X X X X X X
      2nd ○ X X X ○ X ○ X
      D1 1st ○ X X X X X X X
      M8 8th X ○ X X ○ X ○ ○
      M7 7th X ○ ○ X X X ○ ○
      M6 6th X ○ X ○ X X ○ ○
      M5 5th ○ ○ X X X X ○ ○
      M4 4th ○ X X ○ X X ○ ○
      M3 3rd ○ X ○ X X X ○ ○
      M2 2nd ○ X X X ○ X ○ ○
      M1 1st ○ X X X X X X X

      ○: On

      ●: In Accordance with Flex Lock-up

      X: Off

      Operating Condition of Friction Engagement Components and 1-way Clutch
      Shift Position, Shift Range and Gear Range Clutch Brake 1-way Clutch

      C1

      C2

      C3

      C4

      B1

      B2

      F1

      P - - - - - - -
      R - - ○ - - ○ -
      N - - - - - - -
      D, D8 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      3rd ○ - ○ - - - -
      4th ○ - - ○ - - -
      5th ○ ○ - - - - -
      6th - ○ - ○ - - -
      7th - ○ ○ - - - -
      8th - ○ - - ○ - -
      D7 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      3rd ○ - ○ - - - -
      4th ○ - - ○ - - -
      5th ○ ○ - - - - -
      6th - ○ - ○ - - -
      7th - ○ ○ - - - -
      D6 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      3rd ○ - ○ - - - -
      4th ○ - - ○ - - -
      5th ○ ○ - - - - -
      6th - ○ - ○ - - -
      D5 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      3rd ○ - ○ - - - -
      4th ○ - - ○ - - -
      5th ○ ○ - - - - -
      D4 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      3rd ○ - ○ - - - -
      4th ○ - - ○ - - -
      D3 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      3rd ○ - ○ - - - -
      D2 1st ○ - - - - - ○
      2nd ○ - - - ○ - -
      D1 1st ○ - - - - ○ ○
      M8 8th - ○ - - ○ - -
      M7 7th - ○ ○ - - - -
      M6 6th - ○ - ○ - - -
      M5 5th ○ ○ - - - - -
      M4 4th ○ - - ○ - - -
      M3 3rd ○ - ○ - - - -
      M2 2nd ○ - - - ○ - -
      M1 1st ○ - - - - ○ ○

      ○: Operates

      -: Does not Operate

      Figure 1. 1st Gear (S1, D1, M1)

      B003SPS
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 2. 1st Gear (D, S2 to S8, D2 to D8)

      B003SJF
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 3. 2nd Gear

      B003SR2
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 4. 3rd Gear

      B003SJT
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 5. 4th Gear

      B003SJN
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 6. 5th Gear

      B003SMD
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 7. 6th Gear

      B003SQ8
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 8. 7th Gear

      B003SQ0
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 9. 8th Gear

      B003SPK
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -

      Figure 10. Reverse Gear

      B003SPT
      B003SJ8 Input B003SJM Output
      B003SGU Operates - -