Nissan Versa Note. Instruction — part 797
TM-68
< SYSTEM DESCRIPTION >
[CVT: RE0F11A]
STRUCTURE AND OPERATION
STRUCTURE AND OPERATION
TRANSAXLE
TRANSAXLE : Cross-Sectional View
INFOID:0000000009019604
TRANSAXLE : Transaxle Mechanism
INFOID:0000000009019605
BELT & PULLEY
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
JSDIA1777ZZ
STRUCTURE AND OPERATION
TM-69
< SYSTEM DESCRIPTION >
[CVT: RE0F11A]
C
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A
B
TM
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P
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 transmis-
sion 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 with-
stands.
⇒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 trans-
mits 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.
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 pres-
sure chamber at the back of the movable sheave.
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
JSDIA1966ZZ
JSDIA1779GB
TM-70
< SYSTEM DESCRIPTION >
[CVT: RE0F11A]
STRUCTURE AND OPERATION
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.
AUXILIARY GEARBOX MECHANISM
1st, 2nd and reverse gears are changed with the planetary gear mechanism.
TRANSAXLE : Operation Status
INFOID:0000000009019606
×: Engaged or applied.
JSDIA2573GB
Slector le-
ver posi-
tion
Parking
mecha-
nism
Counter
gear set
Low brake High clutch
Reverse
brake
Primary
pulley
Secondary
pulley
Steel belt
Reduction
gear set
P
×
×
×
×
×
R
×
×
×
×
×
×
N
×
×
×
×
D
×
× (1GR)
× (2GR)
×
×
×
×
L
×
× (1GR)
× (2GR)
×
×
×
×
STRUCTURE AND OPERATION
TM-71
< SYSTEM DESCRIPTION >
[CVT: RE0F11A]
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TRANSAXLE : Oil Pressure System
INFOID:0000000009019607
Oil pressure required for operation of the transaxle transmission mechanism is generated by oil pump, oil
pressure control valve, solenoid valve, etc.
TRANSAXLE : Component Description
INFOID:0000000009019608
JSDIA1826GB
Part name
Function
Torque converter
It is composed of the cover converter, turbine assembly, stator, pump impeller assem-
bly, 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 gen-
erates 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 transmis-
sion)
It is composed of the primary pulley, secondary pulley, steel belt, etc. and the mecha-
nism 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 (in-
tegrated 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 pres-
sure) corresponding to the driving condition.
Torque converter regulator valve
Adjusts the feed pressure to the torque converter to the optimum pressure correspond-
ing to the driving condition.
Pilot valve
Adjusts line pressure and produces a constant pressure (pilot pressure) necessary for
activating each solenoid valve.
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