4JJ1 ISUZU Used Fuel Injection Pump For Excavator ZX130 - 5a 8973888284
|Product name: Engine crankshaft||Model Number: 4JJ1|
|Application: Excavator||Part code: 8973888284|
|Staus: Normal||valve: 16 valve|
|Size: Standard||Number of Cylinders: 4|
|Cooling: Water cooling||Injection: Electric Injection|
Crankshaft, Center of Power
The explosion that happens in the cylinder causes the piston to be thrust downward toward the inside of the engine. The connecting rod connects the bottom of the piston to a certain point on the crankshaft, transferring the energy of the combustion (the explosion in the cylinder) from an up and down movement of the piston and connecting rod to a rotational movement in the crankshaft. Every time combustion occurs in a cylinder, the crankshaft is rotated a little more. Each piston has its own connecting rod, and each connecting rod is attached to the crankshaft at a different point. Not only are they spaced out along the long crankshaft, but they are attached at different points in the crankshaft’s rotation, as well.
This means that a different part of the crankshaft is always being pushed along in the rotation. When this happens thousands of times a minute, you get a powerful engine capable of moving a car down the road.
Remember, if you forget to add oil to your engine or change your oil regularly, you run a high risk of seriously damaging the inside of your engine. All of those parts need constant lubrication!
Disadvantages Of Crankshaft
Just like a crank on a jack in the box does, the crankshaft changes the up and down motion of the piston to rotational motion.
• Fatigue limit 500Nm
• Nominal stress 688Mpa
• Stress of unrolled crank 332Mpa
• Combustion pressures in the 100-bar neighbourhood (1450 psi)
Based on the chemical composition of the material we could design the crankshaft dimensions. The crankshaft is designed according to two positions of the crank.
A. When the crank is at dead centre
At this position of the crank the max pressure on the piston will transmit max force on the crankpin in the plane of the crank causing bending at the shaft. Since the bending moment on the shaft is maximum, the twisting moment…show more content…
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