Telescopic Shock Absorber | Working, Diagram and Advantages

Telescopic Shock Absorber:

Construction:

The upper eye of the telescopic shock absorber is attached to the axle and the lower eye is attached to the chassis frame as shown in Figure 4.55. A two way valve V1 is connected to a rod. Another one two-way valve V2 is connected to the lower end of the cylinder. The fluid occupies in the space between above and below the valve VI and also the annular space between cylinder and tube. A gland is provided on the head. Fluid scrapped out by the rod is brought down into the annular space through the inclined passage.

Working:

When the vehicle comes across a bump, the lower eye will move up. So, the fluid follows from lower side of the valve V1 to the upper side. Due to less volume of the space above valve V1 than the volume of the rod, the pressure is exerted on valve V2 Thus, the damping force is produced by this pressure of the fluid. The fluid will flow from the upper side of the valve V1 to lower side when the lower eye moves down and from lower side of the valve V2 to its upper side.
When a car absorbs shocks from the road surface, the suspension springs will compress and expand because the spring has the characteristic of continuing to oscillate for a long time of oscillation to stop. So, a riding comfort will be poor even the damp oscillation is supplied. Shock absorbers provide better road-holding characteristics and improved steering stability to tyres.

telescopic shock absorber diagram
telescopic shock absorber diagram

The stronger is the damping force, the more will be the oscillations of the body. But, the shock from the damping effect becomes greater than the strength of the stronger damping force. The damping force varies with the speed of the piston.

Advantages of telescopic shock absorber:

1. Large amount of energy is dissipated due to large volume of fluid displaced without causing a high temperature rise.
2. There is no wear development in the damper with the absence of connecting arm pivots.
3. The applied force is increased when compared to indirect acting type. Low fluid pressure due to fairly large piston area is occurred with reduced levers.
4. The leakage is very less due to lower pressure and absence of the rotating shaft entering the reservoir.
5. Cost is less than springs.
6. No need of topping up is necessary in most of the telescopic dampers.

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