AUTOMATIC TRANSAXLE SYSTEM


  1. CONSTRUCTION


    1. A 6-speed configuration has been achieved by using 2 planetary gear units, creating a 6-speed automatic transaxle.

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

    3. A centrifugal fluid pressure canceling mechanism is used in the No. 1 clutch (C1) and No. 2 clutch (C2) that are applied when shifting between 1st to 6th gears.

    4. The shapes of the grooves in the clutches and brake linings have been optimized in order to reduce drag.

      B001IOFC01
      *1 No. 1 Clutch (C1) *2 Intermediate Shaft
      *3 Ravigneaux Planetary Gear Unit *4 Counter Driven Gear
      *5 Differential Drive Pinion *6 Input Shaft
      *7 Underdrive Planetary Gear Unit *8 No. 1 Brake (B1)
      *9 No. 3 Brake (B3) *10 Counter Drive Gear
      *11 No. 2 Brake (B2) *12 No. 1 1-way Clutch (F1)
      *13 No. 2 Clutch (C2) - -
      B001IR5C01
      *1 Intermediate Shaft *2 Rear Sun Gear (Ravigneaux Planetary Gear Unit)
      *3 Ring Gear (Ravigneaux Planetary Gear Unit) *4 Counter Driven Gear
      *5 Ring Gear *6 Differential Drive Pinion
      *7 Pinion Gear (Underdrive Planetary Gear Unit) *8 Ring Gear (Underdrive Planetary Gear Unit)
      *9 Input Shaft *10 Sun Gear (Underdrive Planetary Gear Unit)
      *11 Front Sun Gear (Ravigneaux Planetary Gear Unit) *12 Counter Drive Gear
      *13 Short Pinion Gear (Ravigneaux Planetary Gear Unit) *14 Long Pinion Gear (Ravigneaux Planetary Gear Unit)

  2. OPERATION


    1. Transaxle Power Flow

      Operating Condition of Shift Solenoid Valves
      Shift Lever Position and Shift Range Gear Shift Solenoid Valve
      SL SL1 SL2 SL3 SL4 SLU
      P Park - ○ - - - -
      R Reverse ■ - - - ○ -
      N Neutral - ○ - - - -
      D, S2 - S6 1st - ○ - - - -
      2nd ○ ○ - ○ - ▲
      3rd ○ ○ - - ○ ▲
      4th ○ ○ ○ - - ▲
      5th ○ - ○ - ○ ▲
      6th ○ - ○ ○ - ▲
      S1 1st - ○ - - - ○

      Tech Tips

      ○: On

      ▲: In acoordance with flex lock-up

      ■: On while engaging, off after engaged

      -: Does not operate

      Operating Condition of Friction Engagement Components and 1-way Clutch
      Shift Lever Position and Shift Range Gear Clutch Brake 1-way Clutch
      C1 C2 B1 B2 B3 F1
      P Park - - - - - -
      R Reverse - - - ○ ○ -
      N Neutral - - - - - -
      D, S2 - S6 1st ○ - - - - ○
      2nd ○ - ○ - - -
      3rd ○ - - - ○ -
      4th ○ ○ - - - -
      5th - ○ - - ○ -
      6th - ○ ○ - - -
      S1 1st ○ - - <○> - ○

      Tech Tips

      ○: Operates

      <○>: Operates during engine brake

      -: Does not operate

      Figure 1. 1st Gear (Shift Lever in S1 Range)

      B001IOU
      B001IPR Input B001IPD Operates

      Figure 2. 1st Gear (Shift Lever in D or in S6, S5, S4, S3 or S2 Range)

      B001IO4
      B001IPR Input B001IPD Operates

      Figure 3. 2nd Gear (Shift Lever in D or S)

      B001IQJ
      B001IPR Input B001IPD Operates

      Figure 4. 3rd Gear (Shift Lever in D or S)

      B001IO1
      B001IPR Input B001IPD Operates

      Figure 5. 4th Gear (Shift Lever in D or S)

      B001IR8
      B001IPR Input B001IPD Operates

      Figure 6. 5th Gear (Shift Lever in D or S)

      B001IO3
      B001IPR Input B001IPD Operates

      Figure 7. 6th Gear (Shift Lever in D or S)

      B001IPA
      B001IPR Input B001IPD Operates

      Figure 8. Reverse Gear (Shift Lever in R)

      B001IQI
      B001IPR Input B001IPD Operates