NITRO SHOCK ABSORBERS

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NITRO SHOCK ABSORBERS

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CONTENTS

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

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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.

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HOW IT WORKS?

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

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INSIDE OF A SHOCK ABSORBER
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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.

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

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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.

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COMPONENTS

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

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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.

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• 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.

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TYPES AND DETAILS

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

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INSIDE OF A MONO TUBE
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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.

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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.

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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.

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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.

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INSIDE OF A TWIN TUBE
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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.

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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.

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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.

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ADVANTAGES

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

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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.

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Thank You