Infiniti QX56 (Z62). Manual - part 1093

 

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Infiniti QX56 (Z62). Manual - part 1093

 

 

STRUCTURE AND OPERATION

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< SYSTEM DESCRIPTION >

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STRUCTURE AND OPERATION

Hydraulic Body-Motion Control System

INFOID:0000000006256001

Shock Absorber

INFOID:0000000006256002

The use of accumulator-generated pressure responsive to driving conditions or pressure generated by oil flow
to the upper/lower chamber improves the steering stability at curving, in addition to the running performance
and a ride quality during off-road travel.

FRONT SIDE

Oil enters from oil inlet outlet hole (A) and flows into lower chamber (3) via outside oil path of cylinder inside.
Oil enters from oil inlet outlet hole (B) and flows into upper chamber (1). With the pressure difference between
oil flowed into the upper chamber and lower chamber, the piston (2) moves up and down and conveys a force
generated through this motion to the tires.

1.

Middle tube assembly RH

2.

Accumulator assembly RH

3.

Front tube assembly A

4.

Front tube assembly B

5.

Accumulator assembly LH

6.

PPMU pipe A

7.

PPMU assembly

8.

Middle tube assembly LH

9.

PPMU pipe B

10.

Rear tube assembly A

11.

Rear tube assembly B

:

Vehicle front

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STRUCTURE AND OPERATION

REAR SIDE

Oil enters from oil inlet outlet hole (A) and flows into upper chamber (1). Oil enters from oil inlet outlet hole (B)
and flows into lower chamber (3) via outside oil path of cylinder inside. With the pressure difference between
oil flowed into the upper chamber and lower chamber, the piston (2) moves up and down and conveys a force
generated through this motion to the tires.

PPMU

INFOID:0000000006256003

• PPMU stands for Passive Pressure Maintenance Unit.
• System pressure increases according to increase of oil volume due to oil temperature increase. Sudden rise

in system pressure can be controlled by feeding the increased oil into the PPMU.

• Oil flows into oil chamber via PPMU pipe A and PPMU pipe B by influence of pressure change, pushes gas

spring of nitrogen gas, and pools.

1.

Upper chamber

2.

Piston

3.

Lower chamber

A.

Oil inlet outlet hole

B.

Oil inlet outlet hole

:

Vehicle upper

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1.

Upper chamber

2.

Piston

3.

Lower chamber

A.

Oil inlet outlet hole

B.

Oil inlet outlet hole

: Vehicle upper

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STRUCTURE AND OPERATION

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When system pressure decreases, influent oil is distributed to both pipes by gas spring reaction force of
nitrogen gas via PPMU pipe A and PPMU pipe B to control sudden decrease in system pressure.

Accumulator

INFOID:0000000006256004

Influent oil from both front and rear shock absorbers on the outer ring flows simultaneously into the oil cham-
ber during cornering, and gas spring reaction force of nitrogen gas increases pressure, according to the influ-
ent oil level. As for inner ring side, the gas spring conveys oil from the oil chamber to both front and rear shock
absorbers and decreases pressure, according to the oil level.

PPMU Pipe

INFOID:0000000006256005

PPMU and right and left tubes are connected. When oil increases according to increase of system pressure,
increased amount of oil is sent to PPMU. When system pressure decreases, oil discharged from PPMU is sent
to right and left tubes.

1.

Oil chamber

2.

Bellows

3.

Gas chamber

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1.

Oil chamber

2.

Gas chamber

3.

Bellows

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SYSTEM

SYSTEM

System Diagram

INFOID:0000000006256006

System Description

INFOID:0000000006256007

• Drivability during cornering and driving on rough road is improved by mechanically generating oil pressure

by connecting 4 units of shock absorbers to front, rear, right, and left by piping lines of 2 systems.

• Oil filling and system diagnosis can be performed using PPMU.

OPERATING PRINCIPLE

During cornering (Front and rear wheels in the outer side of corner: compressing)

When shock absorber in the outer side of corner is compressed during cornering, oil moves along piping path
and overflowing oil from piping path flows in accumulator in the outer side of corner. Then, pressure increases
by action of gas spring of nitrogen gas according to amount of oil that flows in.
Pressure in the inner side of corner decreases, since oil is discharged from accumulator by stroke (extending
direction) of shock absorber.
The pressure difference generates stabilizer-like action to maintain balance in vehicle posture for a steady
driving at cornering.

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