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NITRO SHOCK ABSORBERS

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nitro shock absorbers contents need for shock absorbers why gas filled shock absorbers? types & advantages mounting tips need for shock absorbers springs alone ... – PowerPoint PPT presentation

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Date added: 24 July 2020
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Title: NITRO SHOCK ABSORBERS


1
NITRO SHOCK ABSORBERS

2
CONTENTS
  • NEED FOR SHOCK ABSORBERS
  • WHY GAS FILLED SHOCK ABSORBERS?
  • TYPES ADVANTAGES
  • MOUNTING TIPS

3
NEED FOR SHOCK ABSORBERS
  • Springs alone cannot provide a
  • satisfactorily smooth ride.
  • Oscillation of spring causes the wheel to
  • rebound, or bounce up and down.
  • Control over the vehicle can be lost.
  • Shock absorbers prevent these spring
  • oscillations.

4
HOW IT WORKS?
  • All shock absorbers use hydraulic fluid to
    convert the energy of the spring to heat.
  • Consists of two strokes
  • Compression
  • Rebound

5
INSIDE OF A SHOCK ABSORBER
6
WHY GAS FILLED SHOCKS?
  • Rapid movement of the fluid between the chambers
    cause foaming.
  • Results in a lag because the piston moves through
    an air pocket which offers resistance.
  • Foaming results in a decrease of damping and a
    loss of spring control.

7
  • Pressure increases in front of the piston and
    drops behind it.
  • All together results in foaming and loss of shock
    absorber control.

8
GAS FILLED SHOCKS
  • Designed to reduce foaming of the oil.
  • Construction is similar except the double tube,
    here a dividing piston is used.
  • Two chambers oil gas.

9
COMPONENTS
  • Upper and lower mounts.
  • Hydraulic chamber containing hydraulic fluid.
  • Gas chamber containing nitrogen at
  • 25 bars.
  • Dividing piston.

10
How it works?
  • The piston rod is moved into the shock
  • absorber which displaces the oil.
  • This causes the dividing piston to press on the
    gas chamber, reducing it in size.
  • While returning the gas pressure returns the
    dividing piston to its initial position.

11
  • The pressure decrease behind the working piston
    cannot be high for the gas to exit from the oil
    column.
  • Thus the gas filled shock absorber operates
    without foaming.

12
TYPES AND DETAILS
  • There are two types of gas filled shock
    absorbers-
  • Mono tube with high pressure
  • Twin tube with low pressure

13
INSIDE OF A MONO TUBE
14
MONO TUBE
  • COMPONENTS
  • Cylinder also called housing.
  • Piston connected to a piston rod.
  • Floating piston also called separating piston.
  • Piston rod guide.
  • Upper and lower attachment.

15
WORKING
  • The cylinder is not completely filled with
  • oil the lower part contains nitrogen at
  • 25-30 bar.
  • Gas and oil are separated by floating
  • piston.

16
BUMP STROKE
  • When the piston rod is pushed in the
  • floating piston is also forced down slightly
  • increasing pressure in both section.
  • Also the oil below the piston is forced to
  • flow through the piston, this generates
  • the bump damping.

17
REBOUND STROKE
  • When the piston rod is pulled out, the oil
    between piston and guide is forced to flow
    through the piston.
  • This resistance generates rebound damping.
  • At the same time part of piston rod will emerge
    from cylinder and free piston move upwards.

18
INSIDE OF A TWIN TUBE
19
TWIN TUBE
  • COMPONENTS
  • Outer tube also called reservoir tube.
  • Inner tube also called cylinder.
  • Piston connected to a piston rod.
  • Bottom valve also called foot valve.
  • Piston rod guide.
  • Upper and lower attachment.

20
BUMP STROKE
  • When the piston is pushed in, oil flows to
  • the enlarged volume above the piston.
  • Simultaneously a quantity of oil is also
  • forced to the reservoir tube.

21
REBOUND STROKE
  • When the piston is pulled out, the oil
  • above the piston is pressurized and flow
  • through the piston.
  • Some oil flows back from the reservoir
  • tube to the lower part.

22
ADVANTAGES
  • Instantaneous response.
  • Better fade resistance.
  • Better durability.
  • No need for re-adjustment.

23
TIPS BEFORE MOUNTING
  • Avoid stiff suspensions.
  • Avoid new shocks to compensate for
  • old and tired springs.
  • Worn shocks reduce safety and
  • handling.
  • The best advice come from a mechanic
  • who knows your vehicle.

24

25
Thank You
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