Nissan Quest E52. Manual - part 1197

TM-18

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

STRUCTURE AND OPERATION

• The power from the torque converter is input via the input shaft, operating a wet multi-plate clutch by means

of hydraulic pressure to switch between forward and reverse driving.

PLANETARY GEAR OPERATION

TRANSAXLE : Belt & Pulley

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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).

JPDIA0951GB

STRUCTURE AND OPERATION

TM-19

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

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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. 

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 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 ten-
sion 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.

JPDIA0953GB

JSDIA2431ZZ

TM-20

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

STRUCTURE AND OPERATION

The movable sheave slides on the shaft to change the groove width of the pulley. Input signals of engine load
(accelerator pedal opening), primary pulley speed and secondary pulley speed change the operation pres-
sures of the primary pulley and the secondary pulley, and controls the pulley groove width.

TRANSAXLE : Final Drive & Differential

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• The deceleration gears are composed of 2 stages: primary deceleration (output gear, idler gear pair) and

secondary deceleration (reduction gear, final gear pair). All of these gears are helical gears.

JSDIA2429GB

STRUCTURE AND OPERATION

TM-21

< SYSTEM DESCRIPTION >

[CVT: RE0F09B]

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• The lubrication oil is the same as the fluid which lubricates the entire transaxle.

TRANSAXLE : Component Description

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JPDIA0952GB

Part name

Function

Torque converter

• Increases engine torque and transmits it to the transaxle.
• In the same way as a conventional A/T, the torque converter is a system that increases the engine 

torque and transmits the torque to the transaxle. A symmetrical 3-element, 1-stage, 2-phase type 
is used here.

Oil pump

The adoption of a trochoidal oil pump with a flow control valve actuated directly by the engine en-
ables the sufficient discharge from an oil pump in the low-rpm range and the adequate discharge 
adjustments in the high-rpm range.

Forward clutch

The forward clutch is wet and multiple plate type clutch that consists of clutch drum, piston, drive 
plate, and driven plate. It is a clutch to move the vehicle forward by activating piston hydraulically, 
engaging plates, and directly connecting sun gear and input shaft.

Reverse brake

The reverse brake is a wet multiple-plate type brake that consists of transaxle case, piston, drive 
plate, and driven plate. It is a brake to move the vehicle in reverse by activating piston hydraulically, 
engaging plates, and fixing planetary gear.

Internal gear

The internal gear is directly connected to forward clutch drum. It is a gear that moves the outer edge 
of pinion planet of planet carrier. It transmits power to move the vehicle in reverse when the planet 
carrier is fixed.

Planet carrier

Composed of a carrier, pinion planet, and pinion shaft. This gear fixes and releases the planet carrier 
in order to switch between forward and reverse driving.

Sun gear

Sun gear is a set part with planet carrier and internal gear. It transmits transmitted force to primary 
fixed sheave. It rotates in forward or reverse direction according to activation of either forward clutch 
or reverse brake.

Input shaft

The input shaft is directly connected to forward clutch drum and transmits traction force from torque 
converter. In shaft center, there are holes for hydraulic distribution to primary pulley and hydraulic 
distribution for lockup ON/OFF.

Primary pulley

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.

Secondary pulley

Steel belt

Manual shaft

When the manual shaft is in the P position, the parking rod that is linked to the manual shaft rotates 
the parking pole. When the parking pole rotates, it engages with the parking gear, fixing the parking 
gear. As a result, the output shaft that is integrated with the parking gear is fixed.

Parking rod

Parking pawl

Parking gear