Shock Absorber - Geely EC718 2009 Workshop Manual

Suspension System
4.2.3 System Working Principle
4.2.3.1 Suspension System Terms
1. Sprung Load:
•
Sprung load refers to the weight supported by the spring.
• Sprung load should be larger than the non-Sprung Load to
get the normal handling performance.
Sprung Load Examples:
a. Body and Frame
b. Load or Cargo
c. Fuel Tank
Spring Components:
a. Frame (Including the subframe)
b. Body (Including the whole body)
c. Power System (Engine, Transmission, Differential, Drive
Axle)
d. Steering
2. Non-Sprung Load:
• Non-Sprung load refers to the weight not supported by the
spring
• The less the non-Sprung Load the better, in order to ensure
the normal handling and ride comfort.
Non-Sprung Load Examples:
a. Wheels and Tires
b. Wheel Bearings and Hub
c. Axle and Steering Knuckle
d. brake parts (mounted on wheels)
Non-Sprung Load Components:
a. Wheels / Tires, Ball Joint, Bearings, Control Arm, Beam,
Cross Members, Overall Drive Axle
b. Stabilizer Bar, Control Rod, etc.
c. Shaft, Steering Knuckle, Brake, etc.
d. Non-Sprung load is small then the suspension response is
good.
3. Components Between Sprung Load and
Non-Sprung Load:
Steering rod, drive axle, stabilizer bar and other components
installed between the sprung load and the non-sprung load.
Front Suspension
4.2.3.2 Suspension
Working Principle
1. Spring:
Spring stiffness will affect the Sprung Load response quality
during driving. If the spring is soft, it can eliminate bumps and
provide a very smooth driving feel, but in the process of braking
and acceleration, it feels crawling and crouching. In the corner,
it intends to roll and tumble. If the spring is firm, it feels less
smooth on bumpy roads, but the body movement is very small,
which means that even in the corner, you can also drive the
vehicle fast. The spring itself is simple. Designing,
implementing these devices and finding balance between the
passenger comfort and vehicle handling performance is not
easy. Smooth driving feel can not be achieved alone by the
spring. The spring absorbing energy ability is excellent, but the
dissipation ability is less impressive. Therefore, the suspension
system uses a device called on shock absorber. If the damping
structure is not used, spring will bounce at an uncontrolled rate
and release the energy it absorbed through bumping and
continue to bounce at its own frequency until it runs out all the
energy. Built on the spring, the suspension allows the vehicle
to drive on bumpy roads without losing control.

2. Shock Absorber:

1
7
1. Piston Rod
2. Inner Cylinder
EC718/EC718RV EC715/EC715RV 10/2009
4-7
System Component
2
3
4
5
6
FE04-1001b