WSM_12-01-01_pl(2).pdf

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12:01-01
Issue 2
en
Leaf spring suspension
1 712 434
© Scania CV AB 2000, Sweden
Contents
Contents
Function Description
Multi-leaf springs ........................................................................ 3
Parabolic spring........................................................................... 4
Clamp bolts ................................................................................. 4
Front springs and spring brackets................................................ 5
Rear springs and wedge-shaped spacers ..................................... 6
Rear springs with helper springs ................................................. 6
Rear springs with tag axle ........................................................... 7
Suspension movement ................................................................. 7
Rear springs for tandem bogie .................................................... 8
Balance tandem ........................................................................... 8
Four-spring tandem ..................................................................... 8
Spring bolt ................................................................................... 9
Frame brackets .......................................................................... 10
Anti-roll bar............................................................................... 10
Special tools .............................................................................. 11
Other tools ................................................................................. 13
Lifting springs ........................................................................... 14
Renewing front spring ............................................................... 15
Renewing rear spring................................................................. 18
Renewing spring bushing .......................................................... 22
Removing spring bolt and spring bushing as one unit .............. 23
Renewing anti-roll bar bushings................................................ 24
Renewing shock absorber.......................................................... 25
Renewing spring leafs and U-bolts ........................................... 26
Leaning vehicles........................................................................ 28
Work Description
2
© Scania CV AB 2000, Sweden
12:01-01
Multi-leaf springs
Function Description
General
System components
Two types of leaf springs are used on Scania
trucks; Multi-leaf springs and parabolic
springs.
Multi-leaf springs
Multi-leaf springs are built up of several spring
leaves of different lengths.
The spring leaves are of the same width and are
often the same thickness as each other.
The longest leaf is called the main leaf or the
1st leaf. It has eyes in the ends if the spring is
attached to the frame using spring bolts.
To prevent a failure of the main leaf causing the
spring to come loose from the spring bracket,
the second leaf also has an eye at the front end.
The spring is held together by a centre bolt
through the spring leaves, plus U-bolts that
prevent the spring leaves from moving
laterally.
Multi-leaf spring
1
Centre bolt
2
U-bolt
3
Spring leaf
4
Safety eye
5
First leaf eye
6
Spring bushing
Multi-leaf spring construction
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© Scania CV AB 2000, Sweden
3
Parabolic spring - Clamp bolts
Parabolic spring
The parabolic spring is built up of two to four leaves
of equal length and width.
The spring leaves are slightly thicker in the centre
and taper to a thinner cross section at the ends.
The spring leaves are not in contact with each other,
as in the multi-leaf spring, but are separated by steel
spacers. This gives a softer suspension action.
Parabolic springs are therefore always combined
with shock absorbers.
The spring has eyes in both ends where the spring
bushings are pressed into place. The leaf under the
blade with bushing eyes also has an eye at the front
end, to prevent the spring from detaching if it fails
at the spring bushing.
Parabolic spring
1
Centre bolt
2
U-bolts
3
Spring leafs
4
Safety eye
5
First leaf eye
6
Spring bushing
7
Spacer
Parabolic spring construction
Clamp bolts
Both the front and rear spring assemblies are
clamped to the axle using two clamp bolts per side.
The clamp bolts are threaded and tightened using
nuts to a specific torque. Consequently, the
tightening torque of the clamp bolts determines the
clamping force in the joint between the spring and
the axle. Therefore, this bolted joint requires
periodic inspections and re-tightening.
Clamp bolts
4
© Scania CV AB 2000, Sweden
12:01-01
Front springs and spring brackets
Front springs and spring brackets
Between the spring assembly and the front axle
is a wedge-shaped bracket that determines the
angle of inclination of the front axle, i.e. the
caster angle, and acts as a bracket for the anti-
roll bar. Re-adjusting can be carried out using
adjusting wedges of 0.5-4°.
1
Adjusting wedge
2
Bracket
Front axle
Vehicles with double front axles do not have an
anti-roll bar fitted to the rear front axle. Between
the springs and front axle 2 is a wedge-shaped
spacer and, if used, adjusting wedges.
1
Adjusting wedge
2
Wedge-shaped spacer
Front axle2
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© Scania CV AB 2000, Sweden
5

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