Table of Contents
What is the purpose of a crankshaft counterweight?
By placing counterweights on opposite sides of the Conrod journals of the crankshaft it is possible to compensate for outer moments, minimise internal moments and therefore reduce the amount of vibration and bearing stresses. The result is a smoother running, longer lasting engine.
What is the function of crankshaft What is the reason for using counterweights Why are there holes drilled onto the crankshaft?
These counterweights allow for a smoother running engine and higher RPM. A crankshaft will be balanced at the factory. In this process, the flywheel is attached and the entire assembly is spun on a machine which measures where it is out of balance. Balance holes are drilled in the counterweights to reduce weight.
What is the primary purposes of counterweights and dampers in crankshafts?
Counterweights and dampers, although not a true part of a crankshaft, are usually attached to it to reduce engine vibration. The journal is supported by, and rotates in, a main bearing. It serves as the center of rotation of the crankshaft.
How do you measure crankshaft counterweight?
Machinists and engine builders have long been taught that, when balancing a crankshaft, its counterweights should equal the weight of the rotating mass, and equal half the weight of the reciprocating mass. Machinists have used this formula to calculate bobweight for decades.
How do you calculate counterweight?
Using the equation, Fe × de = Fl × dl, the torque for the weight, or effort force, is then 2,000 pounds times 50 feet, or 100,000 pound-feet for the weight. The counterbalance weight, or load force, is then, 100,000 pound-feet divided by 20 feet, or 5,000 pounds.
What is the function of crankshaft and piston?
The crankshaft is a moving part of the internal combustion engine (ICE). It’s main function is to transform the linear motion of the piston into rotational motion. The pistons are connected to the crankshaft through the connecting rods. The crankshaft is mounted within the engine block.
What is the function of a piston in a crank mechanism?
The crank is attached to a motor that rotates it. The rod is attached to the crank and the piston at joints that are free to rotate. The guide is fixed in place; its purpose is to make the piston move in a line. The piston is free to move up and down in a line but cannot rotate.
How is a crankshaft lubricated?
Crankshaft Lubrication Splash is provided by the turbulent motion of the crankshaft, and oil level within the crankcase. Pressure lubrication is provided by an oil pump supplying lubricant to the holes and passages pre-drilled in the crankshaft axis and journals.
What is the function of the crankshaft together with the connecting rods?
The con-rod connects the piston to the crankshaft to transfer combustion pressure to the crankpin. There are bearing portions at both ends, the piston side is called the small end, and the crankshaft side, the big end.
How do you calculate counterweight load?
The load required by the counterweights is determined by dividing the resisting force by the distance on the beam from the centre of counterweights to the fulcrum (L).
What is the function of the crankshaft counterweights?
The counterweight is used to reduce the bending load on the crankshaft which also helps the engine not to shake whenever the mechanism of the crank is rotating. The Crankshaft balancing mostly depends on the counterweights.
What is crankshaft balancing?
Crankshaft Balancing Theory. The factory balance job is based on the reciprocating weight of the OE pistons and rods. If any replacements or substitutions are made, there’s no guarantee the new or reconditioned parts will match the weights of the original parts closely enough to retain the original balance.
What is a crankshaft balancer?
The crankshaft harmonic balancer is a device connected to the front of an engine’s crankshaft, usually built into the crankshaft pulley. Its purpose is to absorb and reduce harmonic vibrations from the engine as the crankshaft rotates, as harmonic vibrations at high engine speeds can cause accelerated wear and damage to the components.