suspensi.pdf

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CH-2
CHASSIS — SUSPENSION AND AXLE
SUSPENSION AND AXLE
SUSPENSION
1. General
A MacPherson strut type independent suspension with L-shaped lower arms is used for the front.
A torsion beam type suspension is used for the rear. In contrast to the toe-control link type used on the ’03
Prius, the rear suspension of the ’04 Prius has been changed to a toe-correction bushing type.
255CH103
Specifications
Model
’04 Prius
’03 Prius
Type
MacPherson Strut
Tread*
mm (in.)
1505 (59.3)
1480 (58.3)
Caster*
degrees
3
10’
1
02’
Front Wheel
Front Wheel
Alignment
Camber*
degrees
– 0
35’
– 1
26’
Toe-in*
mm (in.)
0 (0.00)
1 (0.04)
King Pin Inclination*
degrees
12
35’
9
52’
Type
Torsion Beam
Tread*
mm (in.)
1480 (58.3)
1478 (58.2)
Rear Wheel
Rear Wheel
Alignment
Camber*
degrees
– 1
30’
Toe-in*
mm (in.)
3 (0.12)
1 (0.04)
*: Unloaded Vehicle Condition
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CH-3
CHASSIS — SUSPENSION AND AXLE
2. Front Suspension
General
Through the optimal allocation of components, the front suspension realizes excellent riding comfort and
controllability.
Upper Support
•
Coil Spring
• Optimized spring rate
Optimized
characteristics
Stabilizer Bar
•
Optimized Characteristics
Shock Absorber
•
Multi-Leaf type
Linear Control
Valve used
No. 1 Bushing
•
Optimized characteristics
No. 2 Bushing
•
255CH104
Optimized characteristics
Service Tip
To adjust the camber of the front suspension, change the location of the bolts and nuts fastened onto the
lower side of the shock absorber and front axle. For details, refer to the 2004 Prius Repair Manual (Pub.
No. RM1075U).
751620844.015.png
CH-4
CHASSIS — SUSPENSION AND AXLE
Nachlauf Geometry
The front suspension adopts the nachlauf geometry
in which the king pin axis is located ahead of the
axle carrier. As a result, excellent straightline
stability has been realized and the steering feeling
has been improved.
King Pin Axis
Axle Center
Front
181CH22
Negative Camber
The front suspension adopts negative camber to reduce the ground contact camber angle of the outer wheel
at the time of turning (cornering), which is caused when the vehicle posture changes during cornering, thus
realizing excellent cornering performance.
During Cornering
Negative
Camber
181CH23
181CH24
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CH-5
CHASSIS — SUSPENSION AND AXLE
Shock Absorber
1)
General
The shock absorber has adopted the two functions
listed below to realize both driving stability and
riding comfort.
Low-pressure
Gas (N 2 )
A low-pressure (N 2 ) gas sealed type
construction has been adopted to suppress
cavitation.
A multi-leaf type linear control valve has been
adopted to attain linear damping force
characteristics.
Multi-Leaf type
Linear Control
Valve
255CH124
2)
Construction of Multi-Leaf type Linear Control Valve
The multi-leaf type linear control valve has a structure of several layered leaf valves with different
diameter. With the adoption of the multi-leaf type linear control valve, the changes in the damping force
are made constant at low piston speeds, thus realizing the excellent riding comfort and controllability.
Leaf Valves
255CH125
Low
Speed
Medium and High
Speed
Multi-Leaf type
Linear Control Valve
Conventional Valve
Extension
Side Damping
Force
Piston Speed
Compression
Side Damping
Force
Damping Force Characteristics
199CH110
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CH-6
CHASSIS — SUSPENSION AND AXLE
3. Rear Suspension
General
Through the optimal allocation of components, the rear suspension realizes excellent stability and
controllability.
Shock Absorber
•
Multi-leaf type Linear Control
Valve used.
For details, see page CH-24
Coil Spring
•
Optimized spring rate
Stabilizer Bar
•
Optimized Characteristics
Bushing
•
A toe-correct function has been adopted.
255CH105
NOTICE
Be sure to use the jack-up points that are provided on the body when raising the vehicle on the jack. Never
apply a jack under the axle beam, trailing arm, or the bushing of the rear suspension.
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