Table of Contents
What does a torsional damper do?
The Torsional Vibration Damper (TVD) pulley is the pulley on the end of the crank that drives the accessories – alternator, water pump, and air conditioning compressor. The damper is designed to absorb torsional and vertical vibrations from the crank, as a result of the engine combustion process.
What is the purpose of a fluid damper?
Fluidampr is a torsional vibration damper. Its function is to provide durability by controlling destructive torsional vibration. A side benefit to vibration control is releasing lost torque and horsepower through greater efficiency.
What are the causes and effects of torsional vibrations in crankshaft?
Torsional vibrations in this installation may be caused by: Power imbalance of the engine producing a greater variance of torsion produced by the crankshaft. Rotary imbalance of the main engine due to loss of a balance weight. Damage in the gearing being transmitted to the shafting.
What does a performance harmonic balancer do?
The function of the harmonic balancer is to reduce the amplitude of the torsional vibration peaks to an acceptable level. Most OEM harmonic dampers are not designed to cope with the rpm and BHP levels experienced in competition. That is why racers must consider a high-performance damper that is fit for purpose.
What is Detuner in main engine?
De-tuners are used to alter the frequency of the vibrating machinery reducing the vibration of the engine. Side Bracing: Normally fitted on the top of the engine which increases the stiffness and raises the natural frequency beyond the working range.
How is torsional vibration reduced in an engine?
When the shaft starts to torsionally vibrate the springs in the detuner will be compressed, which increases the stiffness of the coupling. Dampening. Once the shaft starts to vibrate the energy of vibration is reduced by the free mass moving within the fluid inside the dampener.
Are fluid dampers good?
If you have made any performance modifications to the engine, a fluid damper is a good idea. A performance type fluid damper is a must if your hot rod is going to be running in competitive events that require an SFI 18.1 spec harmonic balancer.
What are the effects of torsional vibration?
Torsional vibration is often a concern in power transmission systems using rotating shafts or couplings where it can cause failures if not controlled. A second effect of torsional vibrations applies to passenger cars. Torsional vibrations can lead to seat vibrations or noise at certain speeds. Both reduce the comfort.
Can a car run without a harmonic balancer?
And because the belts that go around the crankshaft pulley run all of the car’s accessories, without the harmonic balancer you’d have no air conditioning, no power steering, no alternator and no water pump. And without it, you can do damage to the crankshaft and the engine bearings.
How do torsional vibration dampers work?
Therefore, torsional vibration dampers are tuned to a single frequency, and they therefore damp out the orders of only that frequency in the crankshaft at different engine speeds.
Does damper add horsepower to a crankshaft?
Crankshaft vibration is inherent in any internal combustion engine because of the powerful yet uneven forces that act directly on the crankshaft. Understand, a damper will not add horsepower, but crankshaft vibration will handicap the engine’s horsepower potential.
What are elastomeric dampers and how do they work?
Elastomeric dampers typically use two rings of metal, separated by an engineered polymer. One ring attaches to the crankshaft, the other ring is heavy and is matched to a particular engine’s known vibration frequency at a specific rpm, where that inherent harmonic can do the most damage.
What is a harmonic balancer damper?
In fact, the term “harmonic balancer” derives from the fact that some manufacturers use the hub of the damper to cancel out some engine vibrations simply by adding or removing mass from the hub, which, incidentally, has nothing to do with damping out crankshaft vibrations.