Iveco Daily Euro 4. Manual — part 179

52371

The rear suspension is composed of:

- two leaf springs which, according to the vehicle, can be of

a semi-elliptic type with double flexibility or of a parabolic
type with simple flexibility.;

- two stop bumpers;

- two hydraulic double acting shock absorbers;

- stabilizer bar.

The semi-elliptic leaf spring is very stiff because all leaves
forming the leaf spring have the same thickness from one end
to the other.

Moreover, leaves are placed one against the other and this
causes a great internal friction which limits the movements of
the leaf spring.

The parabolic leaf spring is formed by leaves which have a
greater thickness in the middle than at the two ends.

Leaves are spaced by means of shims and this reduces much
of the internal friction.

The low internal friction and the particular form of the leaves
make the parabolic leaf spring more ”soft”, this makes driving
easier.

Hydraulic double-acting telescopic shock absorbers, hinder
the wheel movement both upwards and downwards, allowing
a great driving stability.

The stabilizer bar must keep the geometry between the wheel
axle and the chassis and arrange the load evenly over the
wheels on the same axle.

REAR SUSPENSION

Figure 82

REAR MECHANICAL SUSPENSIONS

53

D

AILY

E

DESCRIPTION

54

REAR MECHANICAL SUSPENSIONS

D

AILY

E

URO 4

Vehicles:

29 L - 35 S

mm

Parabolic springs

N

o

2

L

Spring length

(measured at eye centres)

1500

± 3

S

Leaf thickness (measured at centre)

24 (22)*

S

Gap between leaves

-

L

Leaf width

80

± 0.5

CONTROL DATA WITH NEW SPRING:

Spring flexibility with static load

8.6 mm/kN

D

Main leaf eye inner diameter

(Bush seat)

40

± 0.5

D

d

D = bush outer diameter

40

+0

−0.1

d = bush inner diameter

16.5

+0.2

−0

(*) Alternatively

REAR MECHANICAL SUSPENSIONS

55

D

AILY

E

0

Rear leaf spring
Vehicles:

35 C - Camper version

mm

Parabolic springs

N

o

2

L

Spring length

(measured at eye centres)

1415

± 3

S

Leaf thickness (measured at centre)

Leaf thickness (measured at centre)

-

S

Gap between leaves

15

L

Leaf width

60

± 0.5

CONTROL DATA WITH NEW SPRING:

Spring flexibility with static load

6.4 mm/kN

D

Main leaf eye inner diameter

(Bush seat)

40

± 0.5

D

d

D = bush outer diameter

40

+0

−0.1

D

d

d = bush inner diameter

16.5

+0.2

−0