AUTOMATIC TRANSMISSION SYSTEM


  1. CONSTRUCTION


    • A highly functional and compact transmission valve body assembly is used. Fewer valves are used, the fluid path is shortened and the shift solenoid valves are made compact to achieve weight reduction. Also, the fluid path and valves are optimally positioned and high flow shift solenoid valves are used to help improve the hydraulic pressure response and shift response. Furthermore, the valve clearance is shortened to reduce the amount of ATF leakage and a lubrication relay valve is added to optimize the volume of lubricant. As a result, transmission torque losses are reduced, contributing to improved fuel economy performance.

    • A vertical 2-part structure is used where the shift solenoid valves are positioned on the transmission valve body assembly on the lower side.

      Figure 1. Location of Shift Solenoid Valves

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      *1 Upper Valve Body *2 Lower Valve Body
      *3 Shift Solenoid Valve SL5 *4 Shift Solenoid Valve SL1
      *5 Shift Solenoid Valve SL3 *6 Shift Solenoid Valve SL6
      *7 Shift Solenoid Valve SL4 *8 Shift Solenoid Valve SC2
      *9 Shift Solenoid Valve SC3 *10 Shift Solenoid Valve SC1
      *11 Shift Solenoid Valve SR *12 Shift Solenoid Valve SL
      *13 Shift Solenoid Valve SLT *14 Shift Solenoid Valve SLU
      *15 Shift Solenoid Valve SL2 - -

      Figure 2. Upper Valve Body

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      *1 Lock-up Relay Valve *2 Lubrication Relay Valve
      *3 Circulation Modulator Valve *4 Signal Check Valve
      *5 C1 Apply Control Valve *6 SL3 Cut Off Valve
      *7 No. 2 D-N-R Shift Valve *8 No. 1 D-N-R Shift Valve
      *9 No. 1 B2 Apply Control Valve *10 No. 2 B2 Apply Control Valve
      *11 Solenoid Modulator Valve *12 Sequence Valve

      Figure 3. Lower Valve Body

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      *1 SL1 Damper *2 SL5 Damper
      *3 Primary Regulator Valve *4 SL2 Damper
      *5 SLU Damper *6 SL4 Damper
      *7 SL6 Damper *8 SL3 Damper

  2. OPERATION


    • The volume of lubricant that flows in the automatic transmission is controlled according to the drive force. The volume of fluid required for lubrication is optimized to reduce losses due to friction and improve fuel efficiency.

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