Toyota
Nissan Versa
 Sedan Service Manual
Transmission & driveline » Transaxle & transmission (TM)
Structure and operation

TRANSAXLE

TRANSAXLE : Cross-Sectional View

TRANSAXLE : Cross-Sectional View

1. Converter housing 2. Oil pump 3. Counter drive gear 4. Control valve 5. Oil pan 6. Primary pulley 7. Steel belt 8. Secondary pulley 9. Planetary gear (auxiliary gearbox) 10. Side cover 11. Transaxle case 12. Differential case 13. Final gear 14. Reduction gear 15. Counter driven gear 16. Drive sprocket 17. Oil pump chain 18. Torque converter 19. Driven sprocket

TRANSAXLE : Transaxle Mechanism

BELT & PULLEY

Mechanism

It is composed of a pair of pulleys (the groove width is changed freely in the axial direction) and the steel belt (the steel plates are placed continuously and the belt is guided with the multilayer steel rings on both sides).

The groove width changes according to wrapping radius of steel belt and pulley from low status to overdrive status continuously with non-step. It is controlled with the oil pressures of primary pulley and secondary pulley.

Steel belt

It is composed of multiple steel plates (A) and two steel rings (B) stacked to a several number. The feature of this steel belt transmits power with compression of the steel plate in contrast with transmission of power in pulling with a rubber belt. Friction force is required with the pulley slope to transmit power from the steel plate. The force is generated with the following mechanism: Oil pressure applies to the secondary pulley to nip the plate. ⇒The plate is pushed and extended outward. ⇒The steel ring shows withstands.

⇒Pulling force is generated on the steel ring. ⇒The plate of the primary pulley is nipped between the pulley. ⇒Friction force is generated between the steel belt and the pulley.

Therefore, responsibilities are divided by the steel plate that transmits the power with compression and the steel ring that maintains necessary friction force. In this way, the tension of the steel ring is distributed on the entire surface and stress variation is limited, resulting in good durability.

Steel belt

Pulley

The primary pulley (input shaft side) and the secondary pulley (output shaft side) have the shaft with slope (fixed cone surface), movable sheave (movable cone surface that can move in the axial direction) and oil pressure chamber at the back of the movable sheave.The primary pulley (input shaft side) and the secondary pulley (output shaft side) have the shaft with slope (fixed cone surface), movable sheave (movable cone surface that can move in the axial direction) and oil pressure chamber at the back of the movable sheave.

Pulley

Pulley gear shifting operation

- Pulley gear shifting operation

The movable sheave slides on the shaft to change the groove width of the pulley. Input signals of engine load (accelerator pedal opening), engine revolution and gear ratio (vehicle speed) change the operation pressures of the primary pulley and the secondary pulley, and controls the pulley groove width. Along with change of the pulley groove width, the belt contact radius is changed. This allows continuous and stepless gear shifting from low to overdrive. "The contact radius ratio of each pulley in contact with the belt x auxiliary gearbox gear ratio" is the gear ratio.

Pulley gear shifting operation

AUXILIARY GEARBOX MECHANISM

1st, 2nd and reverse gears are changed with the planetary gear mechanism.

TRANSAXLE : Operation Status  

TRANSAXLE : Oil Pressure System

Oil pressure required for operation of the transaxle transmission mechanism is generated by oil pump, oil pressure control valve, solenoid valve, etc.

TRANSAXLE : Oil Pressure System

TRANSAXLE : Component Description

Part name Function
Torque converter It is composed of the cover converter, turbine assembly, stator, pump impeller assembly, etc. It increases the engine torque and transmits the power to the transaxle.
Oil pump Through the oil pump drive chain, it uses the vane oil pump driven by the engine. It generates necessary oil pressure to circulate fluid and to operate the clutch and brake.
Counter gear set The power from the torque converter is transmitted to the primary pulley through the counter drive gear and the counter driven gear.
Belt & pulley (Continuously variable transmission) It is composed of the primary pulley, secondary pulley, steel belt, etc. and the mechanism performs shifting, changes the gear ratio and transmits the power with oil pressure from the control valve.
Auxiliary gearbox (stepped transmission) It is composed of the planetary gear, multi-disc clutch, multi-disc brake, etc. and the mechanism performs shifting (1-2 gear shifting and reverse) with oil pressure from the control valve.
Reduction gear set Conveys power from the transmission mechanism to the reduction gear and the final gear.
Parking mechanism When the shift lever is changed to P position, the mechanism fixes the parking gear (integrated with the reduction gear) and the fixes the output shaft.
Control valve Controls oil pressure from the oil pump to the pressure suitable for the line pressure control system, shift control system, lock-up control system and lubrication system.
Pressure regulator valve Adjusts the discharge pressure from the oil pump to the optimum pressure (line pressure) corresponding to the driving condition.
Torque converter regulator valve Adjusts the feed pressure to the torque converter to the optimum pressure corresponding to the driving condition.
Pilot valve Adjusts line pressure and produces a constant pressure (pilot pressure) necessary for activating each solenoid valve.
Manual valve Distributes the clutch and brake operation pressures (pilot pressure) corresponding to each shift position.
High clutch/reverse brake switching valve Switches the circuit for the high clutch and the reverse brake.
Torque converter clutch control valve It is operated with the torque converter clutch solenoid valve and it adjusts the tightening pressure and non-tightening pressure of the torque converter clutch piston of the torque converter
Primary pressure control valve It is operated with the primary pressure solenoid valve and adjusts the feed pressure to the primary pulley.
Primary pressure solenoid valve TM "CVT CONTROL SYSTEM : Primary Pressure Solenoid Valve"
Low brake solenoid valve TM "CVT CONTROL SYSTEM : Low Brake Solenoid Valve"
High clutch & reverse brake solenoid valve TM "CVT CONTROL SYSTEM : High Clutch & Reverse Brake Solenoid Valve"
Torque converter clutch solenoid valve TM "CVT CONTROL SYSTEM : Torque Converter Clutch Solenoid Valve"
Line pressure solenoid valve TM "CVT CONTROL SYSTEM : Line Pressure Solenoid Valve"
    More about «Transaxle & transmission (TM)»:

    Precautions

    Structure and operation

    Position switch

    Gear oil

    Side oil seal

    Position switch

    Control linkage

    Air breather hose

    5Th main gear assembly

    Transaxle assembly

    Transaxle assembly

    Input shaft and gear

    Mainshaft and gear

    Final drive

    Precautions

    A/T Control system

    A/T Shift lock system

    Transaxle

    A/T control system

    Line pressure control

    Shift change control

    Lock-up control

    Diagnosis description

    Consult function

    TCM

    Diagnosis and repair work flow

    Additional service when replacing TCM

    Additional service when replacing transaxle assembly

    A/T Fluid cooler

    Stall test

    Line pressure test

    U0073 Communication bus a off

    U0100 Lost communication (ECM A)

    U0140 Lost communication (BCM)

    U0155 Lost communication (IPC)

    U0300 Can communication data

    U1000 Can comm circuit

    U1117 Lost communication (ABS)

    P062F EEPROM

    P0705 Transmission range switch A

    P0706 Transmission range sensor A

    P0711 Transmission fluid temperature sensor A

    P0712 Transmission fluid temperature sensor A

    P0713 Transmission fluid temperature sensor A

    P0717 Input speed sensor A

    P0720 Output speed sensor

    P072C Stuck in 1GR

    P072D Stuck in 2GR

    P072E Stuck in 3GR

    P072F Stuck in 4GR

    P0731 1GR Incorrect ratio

    P0732 2GR Incorrect ratio

    P0733 3GR Incorrect ratio

    P0734 4GR Incorrect ratio

    P073E Unable to engage r range

    P073F Unable to engage 1GR

    P0740 Torque converter

    P0743 Torque converter

    P0744 Torque converter

    P074A Unable to engage 2GR

    P074B Unable to engage 3GR

    P074C Unable to engage 4GR

    P0863 TCM Communication

    P0890 TCM

    P0962 Pressure control solenoid A

    P0963 Pressure control solenoid A

    P0973 Shift solenoid A

    P0974 Shift solenoid A

    P0976 Shift solenoid B

    P0977 Shift solenoid B

    P0979 Shift solenoid C

    P0980 Shift solenoid C

    P0982 Shift solenoid D

    P0983 Shift solenoid D

    P2760 Torque converter

    Main power supply and ground circuit

    Overdrive control switch

    O/D OFF indicator lamp

    Shift position indicator circuit

    Shift lock system

    A/T Fluid

    A/T Shift selector

    Control cable

    Key interlock cable

    TCM

    Oil pan

    Output speed sensor

    Differential side oil seal

    Fluid cooler tube

    Transmission assembly

    Service data and specifications (SDS)

    Precautions

    Component parts

    Shift lock system

    Structure and operation

    Fluid cooler & fluid warmer system

    CVT Control system

    Line pressure control

    Shift control

    Lock-up control

    Idle neutral control

    Diagnosis system (TCM)

    TCM

    Diagnosis and repair work flow

    Additional service when replacing TCM

    Additional service when replacing transaxle assembly

    Calibration of G Sensor

    CVT Fluid cooler system

    Stall test

    Line pressure test

    U0073 Communication bus A off

    U0100 Lost communication (ECM A)

    U0140 Lost communication (BCM)

    U0141 Lost communication (BCM A)

    U0155 Lost communication (IPC)

    U0300 Can communication data

    U1000 Can COMM circuit

    U1117 Lost communication (ABS)

    P062F EEPROM

    P0705 Transmission range sensor A

    P0706 Transmission range sensor A

    P0711 Transmission fluid temperature sensor A

    P0712 Transmission fluid temperature sensor A

    P0713 Transmission fluid temperature sensor A

    P0715  Input speed sensor A

    P0720 Output speed sensor

    P0740 Torque converter

    P0743 Torque converter

    P0744 Torque converter

    P0746 Pressure control solenoid A

    P0846 Transmission fluid pressure SEN/SW B

    P0847 Transmission fluid pressure SEN/SW B

    P0848 Transmission fluid pressure SEN/SW B

    P0863 TCM Communication

    P0890 TCM

    P0962 Pressure control solenoid A

    P0963 Pressure control solenoid A

    P0965 Pressure control solenoid B

    P0966 Pressure control solenoid B

    P0967 Pressure control solenoid B

    P0998 Shift solenoid F

    P0999 Shift solenoid F

    P099B Shift solenoid G

    P099C Shift solenoid G

    P1586 G Sensor

    P1588 G Sensor

    P2765 Clutch B speed sensor

    P2857 Clutch A pressure

    P2858 Clutch B pressure

    P2859 Clutch A pressure

    P285A Clutch B pressure

    Main power supply and ground circuit

    Overdrive control switch

    OD OFF indicator lamp

    Shift position indicator circuit

    Shift lock system

    CVT Control system

    CVT Fluid

    CVT Shift selector

    Control cable

    Key interlock cable

    TCM

    Air breather hose

    G Sensor

    Oil pan

    Primary speed sensor

    Secondary speed sensor

    Output speed sensor

    Differential side oil seal

    Water hose

    Fluid cooler hose

    PLUG

    Transmission assembly

    Service data and specifications (SDS)

    Nissan Versa Sedan Service Manual / Transmission & driveline / Transaxle & transmission (TM) / Structure and operation

    Nissan Versa Sedan Service Manual

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